Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Serial port driver for the ETRAX 100LX chip |
| 3 | * |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4 | * Copyright (C) 1998-2007 Axis Communications AB |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Many, many authors. Based once upon a time on serial.c for 16x50. |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | static char *serial_version = "$Revision: 1.25 $"; |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/signal.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/timer.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/tty.h> |
| 19 | #include <linux/tty_flip.h> |
| 20 | #include <linux/major.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/fcntl.h> |
| 23 | #include <linux/mm.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/kernel.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 27 | #include <linux/mutex.h> |
Jiri Slaby | 1977f03 | 2007-10-18 23:40:25 -0700 | [diff] [blame] | 28 | #include <linux/bitops.h> |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 29 | #include <linux/seq_file.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/uaccess.h> |
| 33 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/irq.h> |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 36 | #include <asm/dma.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Jesper Nilsson | 556dcee | 2008-10-21 17:45:58 +0200 | [diff] [blame] | 38 | #include <arch/svinto.h> |
David Howells | b1a154d | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 39 | #include <arch/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | /* non-arch dependent serial structures are in linux/serial.h */ |
| 42 | #include <linux/serial.h> |
| 43 | /* while we keep our own stuff (struct e100_serial) in a local .h file */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 44 | #include "crisv10.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/fasttimer.h> |
Jesper Nilsson | 556dcee | 2008-10-21 17:45:58 +0200 | [diff] [blame] | 46 | #include <arch/io_interface_mux.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 49 | #ifndef CONFIG_ETRAX_FAST_TIMER |
| 50 | #error "Enable FAST_TIMER to use SERIAL_FAST_TIMER" |
| 51 | #endif |
| 52 | #endif |
| 53 | |
| 54 | #if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \ |
| 55 | (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0) |
| 56 | #error "RX_TIMEOUT_TICKS == 0 not allowed, use 1" |
| 57 | #endif |
| 58 | |
| 59 | #if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 60 | #error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G" |
| 61 | #endif |
| 62 | |
| 63 | /* |
| 64 | * All of the compatibilty code so we can compile serial.c against |
| 65 | * older kernels is hidden in serial_compat.h |
| 66 | */ |
| 67 | #if defined(LOCAL_HEADERS) |
| 68 | #include "serial_compat.h" |
| 69 | #endif |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | struct tty_driver *serial_driver; |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | /* number of characters left in xmit buffer before we ask for more */ |
| 74 | #define WAKEUP_CHARS 256 |
| 75 | |
| 76 | //#define SERIAL_DEBUG_INTR |
| 77 | //#define SERIAL_DEBUG_OPEN |
| 78 | //#define SERIAL_DEBUG_FLOW |
| 79 | //#define SERIAL_DEBUG_DATA |
| 80 | //#define SERIAL_DEBUG_THROTTLE |
| 81 | //#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */ |
| 82 | //#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */ |
| 83 | |
| 84 | /* Enable this to use serial interrupts to handle when you |
| 85 | expect the first received event on the serial port to |
| 86 | be an error, break or similar. Used to be able to flash IRMA |
| 87 | from eLinux */ |
| 88 | #define SERIAL_HANDLE_EARLY_ERRORS |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | /* Currently 16 descriptors x 128 bytes = 2048 bytes */ |
| 91 | #define SERIAL_DESCR_BUF_SIZE 256 |
| 92 | |
| 93 | #define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */ |
| 94 | #define DEF_BAUD_BASE SERIAL_PRESCALE_BASE |
| 95 | |
| 96 | /* We don't want to load the system with massive fast timer interrupt |
| 97 | * on high baudrates so limit it to 250 us (4kHz) */ |
| 98 | #define MIN_FLUSH_TIME_USEC 250 |
| 99 | |
| 100 | /* Add an x here to log a lot of timer stuff */ |
| 101 | #define TIMERD(x) |
| 102 | /* Debug details of interrupt handling */ |
| 103 | #define DINTR1(x) /* irq on/off, errors */ |
| 104 | #define DINTR2(x) /* tx and rx */ |
| 105 | /* Debug flip buffer stuff */ |
| 106 | #define DFLIP(x) |
| 107 | /* Debug flow control and overview of data flow */ |
| 108 | #define DFLOW(x) |
| 109 | #define DBAUD(x) |
| 110 | #define DLOG_INT_TRIG(x) |
| 111 | |
| 112 | //#define DEBUG_LOG_INCLUDED |
| 113 | #ifndef DEBUG_LOG_INCLUDED |
| 114 | #define DEBUG_LOG(line, string, value) |
| 115 | #else |
| 116 | struct debug_log_info |
| 117 | { |
| 118 | unsigned long time; |
| 119 | unsigned long timer_data; |
| 120 | // int line; |
| 121 | const char *string; |
| 122 | int value; |
| 123 | }; |
| 124 | #define DEBUG_LOG_SIZE 4096 |
| 125 | |
| 126 | struct debug_log_info debug_log[DEBUG_LOG_SIZE]; |
| 127 | int debug_log_pos = 0; |
| 128 | |
| 129 | #define DEBUG_LOG(_line, _string, _value) do { \ |
| 130 | if ((_line) == SERIAL_DEBUG_LINE) {\ |
| 131 | debug_log_func(_line, _string, _value); \ |
| 132 | }\ |
| 133 | }while(0) |
| 134 | |
| 135 | void debug_log_func(int line, const char *string, int value) |
| 136 | { |
| 137 | if (debug_log_pos < DEBUG_LOG_SIZE) { |
| 138 | debug_log[debug_log_pos].time = jiffies; |
| 139 | debug_log[debug_log_pos].timer_data = *R_TIMER_DATA; |
| 140 | // debug_log[debug_log_pos].line = line; |
| 141 | debug_log[debug_log_pos].string = string; |
| 142 | debug_log[debug_log_pos].value = value; |
| 143 | debug_log_pos++; |
| 144 | } |
| 145 | /*printk(string, value);*/ |
| 146 | } |
| 147 | #endif |
| 148 | |
| 149 | #ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS |
| 150 | /* Default number of timer ticks before flushing rx fifo |
| 151 | * When using "little data, low latency applications: use 0 |
| 152 | * When using "much data applications (PPP)" use ~5 |
| 153 | */ |
| 154 | #define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5 |
| 155 | #endif |
| 156 | |
| 157 | unsigned long timer_data_to_ns(unsigned long timer_data); |
| 158 | |
| 159 | static void change_speed(struct e100_serial *info); |
| 160 | static void rs_throttle(struct tty_struct * tty); |
| 161 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 162 | static int rs_write(struct tty_struct *tty, |
| 163 | const unsigned char *buf, int count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | #ifdef CONFIG_ETRAX_RS485 |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 165 | static int e100_write_rs485(struct tty_struct *tty, |
| 166 | const unsigned char *buf, int count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 168 | static int get_lsr_info(struct e100_serial *info, unsigned int *value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | |
| 171 | #define DEF_BAUD 115200 /* 115.2 kbit/s */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | #define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */ |
| 173 | /* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */ |
| 174 | #define DEF_TX 0x80 /* or SERIAL_CTRL_B */ |
| 175 | |
| 176 | /* offsets from R_SERIALx_CTRL */ |
| 177 | |
| 178 | #define REG_DATA 0 |
| 179 | #define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */ |
| 180 | #define REG_TR_DATA 0 |
| 181 | #define REG_STATUS 1 |
| 182 | #define REG_TR_CTRL 1 |
| 183 | #define REG_REC_CTRL 2 |
| 184 | #define REG_BAUD 3 |
| 185 | #define REG_XOFF 4 /* this is a 32 bit register */ |
| 186 | |
| 187 | /* The bitfields are the same for all serial ports */ |
| 188 | #define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd) |
| 189 | #define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail) |
| 190 | #define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err) |
| 191 | #define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err) |
| 192 | #define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun) |
| 193 | |
| 194 | #define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK) |
| 195 | |
| 196 | /* Values for info->errorcode */ |
| 197 | #define ERRCODE_SET_BREAK (TTY_BREAK) |
| 198 | #define ERRCODE_INSERT 0x100 |
| 199 | #define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK) |
| 200 | |
| 201 | #define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop; |
| 202 | |
| 203 | /* |
| 204 | * General note regarding the use of IO_* macros in this file: |
| 205 | * |
| 206 | * We will use the bits defined for DMA channel 6 when using various |
| 207 | * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are |
| 208 | * the same for all channels (which of course they are). |
| 209 | * |
| 210 | * We will also use the bits defined for serial port 0 when writing commands |
| 211 | * to the different ports, as these bits too are the same for all ports. |
| 212 | */ |
| 213 | |
| 214 | |
| 215 | /* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */ |
| 216 | static const unsigned long e100_ser_int_mask = 0 |
| 217 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 218 | | IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
| 219 | #endif |
| 220 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 221 | | IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
| 222 | #endif |
| 223 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 224 | | IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
| 225 | #endif |
| 226 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 227 | | IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready) |
| 228 | #endif |
| 229 | ; |
| 230 | unsigned long r_alt_ser_baudrate_shadow = 0; |
| 231 | |
| 232 | /* this is the data for the four serial ports in the etrax100 */ |
| 233 | /* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */ |
| 234 | /* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */ |
| 235 | |
| 236 | static struct e100_serial rs_table[] = { |
| 237 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 238 | .ioport = (unsigned char *)R_SERIAL0_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | .irq = 1U << 12, /* uses DMA 6 and 7 */ |
| 240 | .oclrintradr = R_DMA_CH6_CLR_INTR, |
| 241 | .ofirstadr = R_DMA_CH6_FIRST, |
| 242 | .ocmdadr = R_DMA_CH6_CMD, |
| 243 | .ostatusadr = R_DMA_CH6_STATUS, |
| 244 | .iclrintradr = R_DMA_CH7_CLR_INTR, |
| 245 | .ifirstadr = R_DMA_CH7_FIRST, |
| 246 | .icmdadr = R_DMA_CH7_CMD, |
| 247 | .idescradr = R_DMA_CH7_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | .rx_ctrl = DEF_RX, |
| 249 | .tx_ctrl = DEF_TX, |
| 250 | .iseteop = 2, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 251 | .dma_owner = dma_ser0, |
| 252 | .io_if = if_serial_0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 254 | .enabled = 1, |
| 255 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT |
| 256 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 257 | .dma_out_nbr = SER0_TX_DMA_NBR, |
| 258 | .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 259 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 260 | .dma_out_irq_description = "serial 0 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | #else |
| 262 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 263 | .dma_out_nbr = UINT_MAX, |
| 264 | .dma_out_irq_nbr = 0, |
| 265 | .dma_out_irq_flags = 0, |
| 266 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | #endif |
| 268 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN |
| 269 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 270 | .dma_in_nbr = SER0_RX_DMA_NBR, |
| 271 | .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 272 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 273 | .dma_in_irq_description = "serial 0 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 275 | .dma_in_enabled = 0, |
| 276 | .dma_in_nbr = UINT_MAX, |
| 277 | .dma_in_irq_nbr = 0, |
| 278 | .dma_in_irq_flags = 0, |
| 279 | .dma_in_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | #endif |
| 281 | #else |
| 282 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 283 | .io_if_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | .dma_out_enabled = 0, |
| 285 | .dma_in_enabled = 0 |
| 286 | #endif |
| 287 | |
| 288 | }, /* ttyS0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 290 | .ioport = (unsigned char *)R_SERIAL1_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | .irq = 1U << 16, /* uses DMA 8 and 9 */ |
| 292 | .oclrintradr = R_DMA_CH8_CLR_INTR, |
| 293 | .ofirstadr = R_DMA_CH8_FIRST, |
| 294 | .ocmdadr = R_DMA_CH8_CMD, |
| 295 | .ostatusadr = R_DMA_CH8_STATUS, |
| 296 | .iclrintradr = R_DMA_CH9_CLR_INTR, |
| 297 | .ifirstadr = R_DMA_CH9_FIRST, |
| 298 | .icmdadr = R_DMA_CH9_CMD, |
| 299 | .idescradr = R_DMA_CH9_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | .rx_ctrl = DEF_RX, |
| 301 | .tx_ctrl = DEF_TX, |
| 302 | .iseteop = 3, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 303 | .dma_owner = dma_ser1, |
| 304 | .io_if = if_serial_1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 306 | .enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 307 | .io_if_description = "ser1", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT |
| 309 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 310 | .dma_out_nbr = SER1_TX_DMA_NBR, |
| 311 | .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 312 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 313 | .dma_out_irq_description = "serial 1 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | #else |
| 315 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 316 | .dma_out_nbr = UINT_MAX, |
| 317 | .dma_out_irq_nbr = 0, |
| 318 | .dma_out_irq_flags = 0, |
| 319 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | #endif |
| 321 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN |
| 322 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 323 | .dma_in_nbr = SER1_RX_DMA_NBR, |
| 324 | .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 325 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 326 | .dma_in_irq_description = "serial 1 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 328 | .dma_in_enabled = 0, |
| 329 | .dma_in_enabled = 0, |
| 330 | .dma_in_nbr = UINT_MAX, |
| 331 | .dma_in_irq_nbr = 0, |
| 332 | .dma_in_irq_flags = 0, |
| 333 | .dma_in_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | #endif |
| 335 | #else |
| 336 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 337 | .io_if_description = NULL, |
| 338 | .dma_in_irq_nbr = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | .dma_out_enabled = 0, |
| 340 | .dma_in_enabled = 0 |
| 341 | #endif |
| 342 | }, /* ttyS1 */ |
| 343 | |
| 344 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 345 | .ioport = (unsigned char *)R_SERIAL2_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | .irq = 1U << 4, /* uses DMA 2 and 3 */ |
| 347 | .oclrintradr = R_DMA_CH2_CLR_INTR, |
| 348 | .ofirstadr = R_DMA_CH2_FIRST, |
| 349 | .ocmdadr = R_DMA_CH2_CMD, |
| 350 | .ostatusadr = R_DMA_CH2_STATUS, |
| 351 | .iclrintradr = R_DMA_CH3_CLR_INTR, |
| 352 | .ifirstadr = R_DMA_CH3_FIRST, |
| 353 | .icmdadr = R_DMA_CH3_CMD, |
| 354 | .idescradr = R_DMA_CH3_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | .rx_ctrl = DEF_RX, |
| 356 | .tx_ctrl = DEF_TX, |
| 357 | .iseteop = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 358 | .dma_owner = dma_ser2, |
| 359 | .io_if = if_serial_2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 361 | .enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 362 | .io_if_description = "ser2", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT |
| 364 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 365 | .dma_out_nbr = SER2_TX_DMA_NBR, |
| 366 | .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 367 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 368 | .dma_out_irq_description = "serial 2 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | #else |
| 370 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 371 | .dma_out_nbr = UINT_MAX, |
| 372 | .dma_out_irq_nbr = 0, |
| 373 | .dma_out_irq_flags = 0, |
| 374 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | #endif |
| 376 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN |
| 377 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 378 | .dma_in_nbr = SER2_RX_DMA_NBR, |
| 379 | .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 380 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 381 | .dma_in_irq_description = "serial 2 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 383 | .dma_in_enabled = 0, |
| 384 | .dma_in_nbr = UINT_MAX, |
| 385 | .dma_in_irq_nbr = 0, |
| 386 | .dma_in_irq_flags = 0, |
| 387 | .dma_in_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | #endif |
| 389 | #else |
| 390 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 391 | .io_if_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | .dma_out_enabled = 0, |
| 393 | .dma_in_enabled = 0 |
| 394 | #endif |
| 395 | }, /* ttyS2 */ |
| 396 | |
| 397 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 398 | .ioport = (unsigned char *)R_SERIAL3_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | .irq = 1U << 8, /* uses DMA 4 and 5 */ |
| 400 | .oclrintradr = R_DMA_CH4_CLR_INTR, |
| 401 | .ofirstadr = R_DMA_CH4_FIRST, |
| 402 | .ocmdadr = R_DMA_CH4_CMD, |
| 403 | .ostatusadr = R_DMA_CH4_STATUS, |
| 404 | .iclrintradr = R_DMA_CH5_CLR_INTR, |
| 405 | .ifirstadr = R_DMA_CH5_FIRST, |
| 406 | .icmdadr = R_DMA_CH5_CMD, |
| 407 | .idescradr = R_DMA_CH5_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | .rx_ctrl = DEF_RX, |
| 409 | .tx_ctrl = DEF_TX, |
| 410 | .iseteop = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 411 | .dma_owner = dma_ser3, |
| 412 | .io_if = if_serial_3, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 414 | .enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 415 | .io_if_description = "ser3", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT |
| 417 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 418 | .dma_out_nbr = SER3_TX_DMA_NBR, |
| 419 | .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 420 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 421 | .dma_out_irq_description = "serial 3 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | #else |
| 423 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 424 | .dma_out_nbr = UINT_MAX, |
| 425 | .dma_out_irq_nbr = 0, |
| 426 | .dma_out_irq_flags = 0, |
| 427 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | #endif |
| 429 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN |
| 430 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 431 | .dma_in_nbr = SER3_RX_DMA_NBR, |
| 432 | .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 433 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 434 | .dma_in_irq_description = "serial 3 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 436 | .dma_in_enabled = 0, |
| 437 | .dma_in_nbr = UINT_MAX, |
| 438 | .dma_in_irq_nbr = 0, |
| 439 | .dma_in_irq_flags = 0, |
| 440 | .dma_in_irq_description = NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | #endif |
| 442 | #else |
| 443 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 444 | .io_if_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | .dma_out_enabled = 0, |
| 446 | .dma_in_enabled = 0 |
| 447 | #endif |
| 448 | } /* ttyS3 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | }; |
| 450 | |
| 451 | |
| 452 | #define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial)) |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 455 | static struct fast_timer fast_timers[NR_PORTS]; |
| 456 | #endif |
| 457 | |
| 458 | #ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY |
| 459 | #define PROCSTAT(x) x |
| 460 | struct ser_statistics_type { |
| 461 | int overrun_cnt; |
| 462 | int early_errors_cnt; |
| 463 | int ser_ints_ok_cnt; |
| 464 | int errors_cnt; |
| 465 | unsigned long int processing_flip; |
| 466 | unsigned long processing_flip_still_room; |
| 467 | unsigned long int timeout_flush_cnt; |
| 468 | int rx_dma_ints; |
| 469 | int tx_dma_ints; |
| 470 | int rx_tot; |
| 471 | int tx_tot; |
| 472 | }; |
| 473 | |
| 474 | static struct ser_statistics_type ser_stat[NR_PORTS]; |
| 475 | |
| 476 | #else |
| 477 | |
| 478 | #define PROCSTAT(x) |
| 479 | |
| 480 | #endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */ |
| 481 | |
| 482 | /* RS-485 */ |
| 483 | #if defined(CONFIG_ETRAX_RS485) |
| 484 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 485 | static struct fast_timer fast_timers_rs485[NR_PORTS]; |
| 486 | #endif |
| 487 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 488 | static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT; |
| 489 | #endif |
| 490 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 491 | static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT; |
| 492 | #endif |
| 493 | #endif |
| 494 | |
| 495 | /* Info and macros needed for each ports extra control/status signals. */ |
| 496 | #define E100_STRUCT_PORT(line, pinname) \ |
| 497 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 498 | (R_PORT_PA_DATA): ( \ |
| 499 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 500 | (R_PORT_PB_DATA):&dummy_ser[line])) |
| 501 | |
| 502 | #define E100_STRUCT_SHADOW(line, pinname) \ |
| 503 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 504 | (&port_pa_data_shadow): ( \ |
| 505 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 506 | (&port_pb_data_shadow):&dummy_ser[line])) |
| 507 | #define E100_STRUCT_MASK(line, pinname) \ |
| 508 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 509 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \ |
| 510 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 511 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK)) |
| 512 | |
| 513 | #define DUMMY_DTR_MASK 1 |
| 514 | #define DUMMY_RI_MASK 2 |
| 515 | #define DUMMY_DSR_MASK 4 |
| 516 | #define DUMMY_CD_MASK 8 |
| 517 | static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF}; |
| 518 | |
| 519 | /* If not all status pins are used or disabled, use mixed mode */ |
| 520 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 521 | |
| 522 | #define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT) |
| 523 | |
| 524 | #if SER0_PA_BITSUM != -4 |
| 525 | # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1 |
| 526 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 527 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 528 | # endif |
| 529 | # endif |
| 530 | # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1 |
| 531 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 532 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 533 | # endif |
| 534 | # endif |
| 535 | # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1 |
| 536 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 537 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 538 | # endif |
| 539 | # endif |
| 540 | # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1 |
| 541 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 542 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 543 | # endif |
| 544 | # endif |
| 545 | #endif |
| 546 | |
| 547 | #define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT) |
| 548 | |
| 549 | #if SER0_PB_BITSUM != -4 |
| 550 | # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1 |
| 551 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 552 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 553 | # endif |
| 554 | # endif |
| 555 | # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1 |
| 556 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 557 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 558 | # endif |
| 559 | # endif |
| 560 | # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1 |
| 561 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 562 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 563 | # endif |
| 564 | # endif |
| 565 | # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1 |
| 566 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 567 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 568 | # endif |
| 569 | # endif |
| 570 | #endif |
| 571 | |
| 572 | #endif /* PORT0 */ |
| 573 | |
| 574 | |
| 575 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 576 | |
| 577 | #define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT) |
| 578 | |
| 579 | #if SER1_PA_BITSUM != -4 |
| 580 | # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1 |
| 581 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 582 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 583 | # endif |
| 584 | # endif |
| 585 | # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1 |
| 586 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 587 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 588 | # endif |
| 589 | # endif |
| 590 | # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1 |
| 591 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 592 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 593 | # endif |
| 594 | # endif |
| 595 | # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1 |
| 596 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 597 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 598 | # endif |
| 599 | # endif |
| 600 | #endif |
| 601 | |
| 602 | #define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT) |
| 603 | |
| 604 | #if SER1_PB_BITSUM != -4 |
| 605 | # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1 |
| 606 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 607 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 608 | # endif |
| 609 | # endif |
| 610 | # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1 |
| 611 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 612 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 613 | # endif |
| 614 | # endif |
| 615 | # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1 |
| 616 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 617 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 618 | # endif |
| 619 | # endif |
| 620 | # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1 |
| 621 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 622 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 623 | # endif |
| 624 | # endif |
| 625 | #endif |
| 626 | |
| 627 | #endif /* PORT1 */ |
| 628 | |
| 629 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 630 | |
| 631 | #define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT) |
| 632 | |
| 633 | #if SER2_PA_BITSUM != -4 |
| 634 | # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1 |
| 635 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 636 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 637 | # endif |
| 638 | # endif |
| 639 | # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1 |
| 640 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 641 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 642 | # endif |
| 643 | # endif |
| 644 | # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1 |
| 645 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 646 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 647 | # endif |
| 648 | # endif |
| 649 | # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1 |
| 650 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 651 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 652 | # endif |
| 653 | # endif |
| 654 | #endif |
| 655 | |
| 656 | #define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT) |
| 657 | |
| 658 | #if SER2_PB_BITSUM != -4 |
| 659 | # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1 |
| 660 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 661 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 662 | # endif |
| 663 | # endif |
| 664 | # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1 |
| 665 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 666 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 667 | # endif |
| 668 | # endif |
| 669 | # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1 |
| 670 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 671 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 672 | # endif |
| 673 | # endif |
| 674 | # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1 |
| 675 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 676 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 677 | # endif |
| 678 | # endif |
| 679 | #endif |
| 680 | |
| 681 | #endif /* PORT2 */ |
| 682 | |
| 683 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 684 | |
| 685 | #define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT) |
| 686 | |
| 687 | #if SER3_PA_BITSUM != -4 |
| 688 | # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1 |
| 689 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 690 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 691 | # endif |
| 692 | # endif |
| 693 | # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1 |
| 694 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 695 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 696 | # endif |
| 697 | # endif |
| 698 | # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1 |
| 699 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 700 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 701 | # endif |
| 702 | # endif |
| 703 | # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1 |
| 704 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 705 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 706 | # endif |
| 707 | # endif |
| 708 | #endif |
| 709 | |
| 710 | #define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT) |
| 711 | |
| 712 | #if SER3_PB_BITSUM != -4 |
| 713 | # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1 |
| 714 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 715 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 716 | # endif |
| 717 | # endif |
| 718 | # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1 |
| 719 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 720 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 721 | # endif |
| 722 | # endif |
| 723 | # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1 |
| 724 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 725 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 726 | # endif |
| 727 | # endif |
| 728 | # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1 |
| 729 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 730 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 731 | # endif |
| 732 | # endif |
| 733 | #endif |
| 734 | |
| 735 | #endif /* PORT3 */ |
| 736 | |
| 737 | |
| 738 | #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \ |
| 739 | defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \ |
| 740 | defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \ |
| 741 | defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED) |
| 742 | #define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED |
| 743 | #endif |
| 744 | |
| 745 | #ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED |
| 746 | /* The pins can be mixed on PA and PB */ |
| 747 | #define CONTROL_PINS_PORT_NOT_USED(line) \ |
| 748 | &dummy_ser[line], &dummy_ser[line], \ |
| 749 | &dummy_ser[line], &dummy_ser[line], \ |
| 750 | &dummy_ser[line], &dummy_ser[line], \ |
| 751 | &dummy_ser[line], &dummy_ser[line], \ |
| 752 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK |
| 753 | |
| 754 | |
| 755 | struct control_pins |
| 756 | { |
| 757 | volatile unsigned char *dtr_port; |
| 758 | unsigned char *dtr_shadow; |
| 759 | volatile unsigned char *ri_port; |
| 760 | unsigned char *ri_shadow; |
| 761 | volatile unsigned char *dsr_port; |
| 762 | unsigned char *dsr_shadow; |
| 763 | volatile unsigned char *cd_port; |
| 764 | unsigned char *cd_shadow; |
| 765 | |
| 766 | unsigned char dtr_mask; |
| 767 | unsigned char ri_mask; |
| 768 | unsigned char dsr_mask; |
| 769 | unsigned char cd_mask; |
| 770 | }; |
| 771 | |
| 772 | static const struct control_pins e100_modem_pins[NR_PORTS] = |
| 773 | { |
| 774 | /* Ser 0 */ |
| 775 | { |
| 776 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 777 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), |
| 778 | E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI), |
| 779 | E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR), |
| 780 | E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD), |
| 781 | E100_STRUCT_MASK(0,DTR), |
| 782 | E100_STRUCT_MASK(0,RI), |
| 783 | E100_STRUCT_MASK(0,DSR), |
| 784 | E100_STRUCT_MASK(0,CD) |
| 785 | #else |
| 786 | CONTROL_PINS_PORT_NOT_USED(0) |
| 787 | #endif |
| 788 | }, |
| 789 | |
| 790 | /* Ser 1 */ |
| 791 | { |
| 792 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 793 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), |
| 794 | E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI), |
| 795 | E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR), |
| 796 | E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD), |
| 797 | E100_STRUCT_MASK(1,DTR), |
| 798 | E100_STRUCT_MASK(1,RI), |
| 799 | E100_STRUCT_MASK(1,DSR), |
| 800 | E100_STRUCT_MASK(1,CD) |
| 801 | #else |
| 802 | CONTROL_PINS_PORT_NOT_USED(1) |
| 803 | #endif |
| 804 | }, |
| 805 | |
| 806 | /* Ser 2 */ |
| 807 | { |
| 808 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 809 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), |
| 810 | E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI), |
| 811 | E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR), |
| 812 | E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD), |
| 813 | E100_STRUCT_MASK(2,DTR), |
| 814 | E100_STRUCT_MASK(2,RI), |
| 815 | E100_STRUCT_MASK(2,DSR), |
| 816 | E100_STRUCT_MASK(2,CD) |
| 817 | #else |
| 818 | CONTROL_PINS_PORT_NOT_USED(2) |
| 819 | #endif |
| 820 | }, |
| 821 | |
| 822 | /* Ser 3 */ |
| 823 | { |
| 824 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 825 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), |
| 826 | E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI), |
| 827 | E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR), |
| 828 | E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD), |
| 829 | E100_STRUCT_MASK(3,DTR), |
| 830 | E100_STRUCT_MASK(3,RI), |
| 831 | E100_STRUCT_MASK(3,DSR), |
| 832 | E100_STRUCT_MASK(3,CD) |
| 833 | #else |
| 834 | CONTROL_PINS_PORT_NOT_USED(3) |
| 835 | #endif |
| 836 | } |
| 837 | }; |
| 838 | #else /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ |
| 839 | |
| 840 | /* All pins are on either PA or PB for each serial port */ |
| 841 | #define CONTROL_PINS_PORT_NOT_USED(line) \ |
| 842 | &dummy_ser[line], &dummy_ser[line], \ |
| 843 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK |
| 844 | |
| 845 | |
| 846 | struct control_pins |
| 847 | { |
| 848 | volatile unsigned char *port; |
| 849 | unsigned char *shadow; |
| 850 | |
| 851 | unsigned char dtr_mask; |
| 852 | unsigned char ri_mask; |
| 853 | unsigned char dsr_mask; |
| 854 | unsigned char cd_mask; |
| 855 | }; |
| 856 | |
| 857 | #define dtr_port port |
| 858 | #define dtr_shadow shadow |
| 859 | #define ri_port port |
| 860 | #define ri_shadow shadow |
| 861 | #define dsr_port port |
| 862 | #define dsr_shadow shadow |
| 863 | #define cd_port port |
| 864 | #define cd_shadow shadow |
| 865 | |
| 866 | static const struct control_pins e100_modem_pins[NR_PORTS] = |
| 867 | { |
| 868 | /* Ser 0 */ |
| 869 | { |
| 870 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 871 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), |
| 872 | E100_STRUCT_MASK(0,DTR), |
| 873 | E100_STRUCT_MASK(0,RI), |
| 874 | E100_STRUCT_MASK(0,DSR), |
| 875 | E100_STRUCT_MASK(0,CD) |
| 876 | #else |
| 877 | CONTROL_PINS_PORT_NOT_USED(0) |
| 878 | #endif |
| 879 | }, |
| 880 | |
| 881 | /* Ser 1 */ |
| 882 | { |
| 883 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 884 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), |
| 885 | E100_STRUCT_MASK(1,DTR), |
| 886 | E100_STRUCT_MASK(1,RI), |
| 887 | E100_STRUCT_MASK(1,DSR), |
| 888 | E100_STRUCT_MASK(1,CD) |
| 889 | #else |
| 890 | CONTROL_PINS_PORT_NOT_USED(1) |
| 891 | #endif |
| 892 | }, |
| 893 | |
| 894 | /* Ser 2 */ |
| 895 | { |
| 896 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 897 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), |
| 898 | E100_STRUCT_MASK(2,DTR), |
| 899 | E100_STRUCT_MASK(2,RI), |
| 900 | E100_STRUCT_MASK(2,DSR), |
| 901 | E100_STRUCT_MASK(2,CD) |
| 902 | #else |
| 903 | CONTROL_PINS_PORT_NOT_USED(2) |
| 904 | #endif |
| 905 | }, |
| 906 | |
| 907 | /* Ser 3 */ |
| 908 | { |
| 909 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 910 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), |
| 911 | E100_STRUCT_MASK(3,DTR), |
| 912 | E100_STRUCT_MASK(3,RI), |
| 913 | E100_STRUCT_MASK(3,DSR), |
| 914 | E100_STRUCT_MASK(3,CD) |
| 915 | #else |
| 916 | CONTROL_PINS_PORT_NOT_USED(3) |
| 917 | #endif |
| 918 | } |
| 919 | }; |
| 920 | #endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ |
| 921 | |
| 922 | #define E100_RTS_MASK 0x20 |
| 923 | #define E100_CTS_MASK 0x40 |
| 924 | |
| 925 | /* All serial port signals are active low: |
| 926 | * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level |
| 927 | * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level |
| 928 | * |
| 929 | * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip |
| 930 | */ |
| 931 | |
| 932 | /* Output */ |
| 933 | #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK) |
| 934 | /* Input */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 935 | #define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | |
| 937 | /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */ |
| 938 | /* Is an output */ |
| 939 | #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask) |
| 940 | |
| 941 | /* Normally inputs */ |
| 942 | #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask) |
| 943 | #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask) |
| 944 | |
| 945 | /* Input */ |
| 946 | #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask) |
| 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | /* Calculate the chartime depending on baudrate, numbor of bits etc. */ |
| 949 | static void update_char_time(struct e100_serial * info) |
| 950 | { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 951 | tcflag_t cflags = info->port.tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | int bits; |
| 953 | |
| 954 | /* calc. number of bits / data byte */ |
| 955 | /* databits + startbit and 1 stopbit */ |
| 956 | if ((cflags & CSIZE) == CS7) |
| 957 | bits = 9; |
| 958 | else |
| 959 | bits = 10; |
| 960 | |
| 961 | if (cflags & CSTOPB) /* 2 stopbits ? */ |
| 962 | bits++; |
| 963 | |
| 964 | if (cflags & PARENB) /* parity bit ? */ |
| 965 | bits++; |
| 966 | |
| 967 | /* calc timeout */ |
| 968 | info->char_time_usec = ((bits * 1000000) / info->baud) + 1; |
| 969 | info->flush_time_usec = 4*info->char_time_usec; |
| 970 | if (info->flush_time_usec < MIN_FLUSH_TIME_USEC) |
| 971 | info->flush_time_usec = MIN_FLUSH_TIME_USEC; |
| 972 | |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | * This function maps from the Bxxxx defines in asm/termbits.h into real |
| 977 | * baud rates. |
| 978 | */ |
| 979 | |
| 980 | static int |
| 981 | cflag_to_baud(unsigned int cflag) |
| 982 | { |
| 983 | static int baud_table[] = { |
| 984 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, |
| 985 | 4800, 9600, 19200, 38400 }; |
| 986 | |
| 987 | static int ext_baud_table[] = { |
| 988 | 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000, |
| 989 | 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 990 | |
| 991 | if (cflag & CBAUDEX) |
| 992 | return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; |
| 993 | else |
| 994 | return baud_table[cflag & CBAUD]; |
| 995 | } |
| 996 | |
| 997 | /* and this maps to an etrax100 hardware baud constant */ |
| 998 | |
| 999 | static unsigned char |
| 1000 | cflag_to_etrax_baud(unsigned int cflag) |
| 1001 | { |
| 1002 | char retval; |
| 1003 | |
| 1004 | static char baud_table[] = { |
| 1005 | -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 }; |
| 1006 | |
| 1007 | static char ext_baud_table[] = { |
| 1008 | -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 }; |
| 1009 | |
| 1010 | if (cflag & CBAUDEX) |
| 1011 | retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; |
| 1012 | else |
| 1013 | retval = baud_table[cflag & CBAUD]; |
| 1014 | |
| 1015 | if (retval < 0) { |
| 1016 | printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag); |
| 1017 | retval = 5; /* choose default 9600 instead */ |
| 1018 | } |
| 1019 | |
| 1020 | return retval | (retval << 4); /* choose same for both TX and RX */ |
| 1021 | } |
| 1022 | |
| 1023 | |
| 1024 | /* Various static support functions */ |
| 1025 | |
| 1026 | /* Functions to set or clear DTR/RTS on the requested line */ |
| 1027 | /* It is complicated by the fact that RTS is a serial port register, while |
| 1028 | * DTR might not be implemented in the HW at all, and if it is, it can be on |
| 1029 | * any general port. |
| 1030 | */ |
| 1031 | |
| 1032 | |
| 1033 | static inline void |
| 1034 | e100_dtr(struct e100_serial *info, int set) |
| 1035 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | unsigned char mask = e100_modem_pins[info->line].dtr_mask; |
| 1037 | |
| 1038 | #ifdef SERIAL_DEBUG_IO |
| 1039 | printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask); |
| 1040 | printk("ser%i shadow before 0x%02X get: %i\n", |
| 1041 | info->line, *e100_modem_pins[info->line].dtr_shadow, |
| 1042 | E100_DTR_GET(info)); |
| 1043 | #endif |
| 1044 | /* DTR is active low */ |
| 1045 | { |
| 1046 | unsigned long flags; |
| 1047 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1048 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | *e100_modem_pins[info->line].dtr_shadow &= ~mask; |
| 1050 | *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask); |
| 1051 | *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1052 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | #ifdef SERIAL_DEBUG_IO |
| 1056 | printk("ser%i shadow after 0x%02X get: %i\n", |
| 1057 | info->line, *e100_modem_pins[info->line].dtr_shadow, |
| 1058 | E100_DTR_GET(info)); |
| 1059 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | } |
| 1061 | |
| 1062 | /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive |
| 1063 | * 0=0V , 1=3.3V |
| 1064 | */ |
| 1065 | static inline void |
| 1066 | e100_rts(struct e100_serial *info, int set) |
| 1067 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | unsigned long flags; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1069 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | info->rx_ctrl &= ~E100_RTS_MASK; |
| 1071 | info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1072 | info->ioport[REG_REC_CTRL] = info->rx_ctrl; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1073 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | #ifdef SERIAL_DEBUG_IO |
| 1075 | printk("ser%i rts %i\n", info->line, set); |
| 1076 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | } |
| 1078 | |
| 1079 | |
| 1080 | /* If this behaves as a modem, RI and CD is an output */ |
| 1081 | static inline void |
| 1082 | e100_ri_out(struct e100_serial *info, int set) |
| 1083 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | /* RI is active low */ |
| 1085 | { |
| 1086 | unsigned char mask = e100_modem_pins[info->line].ri_mask; |
| 1087 | unsigned long flags; |
| 1088 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1089 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | *e100_modem_pins[info->line].ri_shadow &= ~mask; |
| 1091 | *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask); |
| 1092 | *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1093 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | } |
| 1096 | static inline void |
| 1097 | e100_cd_out(struct e100_serial *info, int set) |
| 1098 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | /* CD is active low */ |
| 1100 | { |
| 1101 | unsigned char mask = e100_modem_pins[info->line].cd_mask; |
| 1102 | unsigned long flags; |
| 1103 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1104 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | *e100_modem_pins[info->line].cd_shadow &= ~mask; |
| 1106 | *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask); |
| 1107 | *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1108 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } |
| 1111 | |
| 1112 | static inline void |
| 1113 | e100_disable_rx(struct e100_serial *info) |
| 1114 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | /* disable the receiver */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1116 | info->ioport[REG_REC_CTRL] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | } |
| 1119 | |
| 1120 | static inline void |
| 1121 | e100_enable_rx(struct e100_serial *info) |
| 1122 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | /* enable the receiver */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1124 | info->ioport[REG_REC_CTRL] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | } |
| 1127 | |
| 1128 | /* the rx DMA uses both the dma_descr and the dma_eop interrupts */ |
| 1129 | |
| 1130 | static inline void |
| 1131 | e100_disable_rxdma_irq(struct e100_serial *info) |
| 1132 | { |
| 1133 | #ifdef SERIAL_DEBUG_INTR |
| 1134 | printk("rxdma_irq(%d): 0\n",info->line); |
| 1135 | #endif |
| 1136 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line)); |
| 1137 | *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3); |
| 1138 | } |
| 1139 | |
| 1140 | static inline void |
| 1141 | e100_enable_rxdma_irq(struct e100_serial *info) |
| 1142 | { |
| 1143 | #ifdef SERIAL_DEBUG_INTR |
| 1144 | printk("rxdma_irq(%d): 1\n",info->line); |
| 1145 | #endif |
| 1146 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line)); |
| 1147 | *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3); |
| 1148 | } |
| 1149 | |
| 1150 | /* the tx DMA uses only dma_descr interrupt */ |
| 1151 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1152 | static void e100_disable_txdma_irq(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | { |
| 1154 | #ifdef SERIAL_DEBUG_INTR |
| 1155 | printk("txdma_irq(%d): 0\n",info->line); |
| 1156 | #endif |
| 1157 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line)); |
| 1158 | *R_IRQ_MASK2_CLR = info->irq; |
| 1159 | } |
| 1160 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1161 | static void e100_enable_txdma_irq(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | { |
| 1163 | #ifdef SERIAL_DEBUG_INTR |
| 1164 | printk("txdma_irq(%d): 1\n",info->line); |
| 1165 | #endif |
| 1166 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line)); |
| 1167 | *R_IRQ_MASK2_SET = info->irq; |
| 1168 | } |
| 1169 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1170 | static void e100_disable_txdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | { |
| 1172 | unsigned long flags; |
| 1173 | |
| 1174 | /* Disable output DMA channel for the serial port in question |
Frederik Schwarzer | 025dfda | 2008-10-16 19:02:37 +0200 | [diff] [blame] | 1175 | * ( set to something other than serialX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1177 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line)); |
| 1179 | if (info->line == 0) { |
| 1180 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) == |
| 1181 | IO_STATE(R_GEN_CONFIG, dma6, serial0)) { |
| 1182 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); |
| 1183 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused); |
| 1184 | } |
| 1185 | } else if (info->line == 1) { |
| 1186 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) == |
| 1187 | IO_STATE(R_GEN_CONFIG, dma8, serial1)) { |
| 1188 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); |
| 1189 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb); |
| 1190 | } |
| 1191 | } else if (info->line == 2) { |
| 1192 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) == |
| 1193 | IO_STATE(R_GEN_CONFIG, dma2, serial2)) { |
| 1194 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); |
| 1195 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0); |
| 1196 | } |
| 1197 | } else if (info->line == 3) { |
| 1198 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) == |
| 1199 | IO_STATE(R_GEN_CONFIG, dma4, serial3)) { |
| 1200 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); |
| 1201 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1); |
| 1202 | } |
| 1203 | } |
| 1204 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1205 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1209 | static void e100_enable_txdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | { |
| 1211 | unsigned long flags; |
| 1212 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1213 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line)); |
| 1215 | /* Enable output DMA channel for the serial port in question */ |
| 1216 | if (info->line == 0) { |
| 1217 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); |
| 1218 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0); |
| 1219 | } else if (info->line == 1) { |
| 1220 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); |
| 1221 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1); |
| 1222 | } else if (info->line == 2) { |
| 1223 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); |
| 1224 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2); |
| 1225 | } else if (info->line == 3) { |
| 1226 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); |
| 1227 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3); |
| 1228 | } |
| 1229 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1230 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1233 | static void e100_disable_rxdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | { |
| 1235 | unsigned long flags; |
| 1236 | |
| 1237 | /* Disable input DMA channel for the serial port in question |
Frederik Schwarzer | 025dfda | 2008-10-16 19:02:37 +0200 | [diff] [blame] | 1238 | * ( set to something other than serialX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1240 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | if (info->line == 0) { |
| 1242 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) == |
| 1243 | IO_STATE(R_GEN_CONFIG, dma7, serial0)) { |
| 1244 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); |
| 1245 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused); |
| 1246 | } |
| 1247 | } else if (info->line == 1) { |
| 1248 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) == |
| 1249 | IO_STATE(R_GEN_CONFIG, dma9, serial1)) { |
| 1250 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); |
| 1251 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb); |
| 1252 | } |
| 1253 | } else if (info->line == 2) { |
| 1254 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) == |
| 1255 | IO_STATE(R_GEN_CONFIG, dma3, serial2)) { |
| 1256 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); |
| 1257 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0); |
| 1258 | } |
| 1259 | } else if (info->line == 3) { |
| 1260 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) == |
| 1261 | IO_STATE(R_GEN_CONFIG, dma5, serial3)) { |
| 1262 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); |
| 1263 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1); |
| 1264 | } |
| 1265 | } |
| 1266 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1267 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
| 1270 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1271 | static void e100_enable_rxdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | { |
| 1273 | unsigned long flags; |
| 1274 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1275 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | /* Enable input DMA channel for the serial port in question */ |
| 1277 | if (info->line == 0) { |
| 1278 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); |
| 1279 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0); |
| 1280 | } else if (info->line == 1) { |
| 1281 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); |
| 1282 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1); |
| 1283 | } else if (info->line == 2) { |
| 1284 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); |
| 1285 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2); |
| 1286 | } else if (info->line == 3) { |
| 1287 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); |
| 1288 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3); |
| 1289 | } |
| 1290 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1291 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | } |
| 1293 | |
| 1294 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 1295 | /* in order to detect and fix errors on the first byte |
| 1296 | we have to use the serial interrupts as well. */ |
| 1297 | |
| 1298 | static inline void |
| 1299 | e100_disable_serial_data_irq(struct e100_serial *info) |
| 1300 | { |
| 1301 | #ifdef SERIAL_DEBUG_INTR |
| 1302 | printk("ser_irq(%d): 0\n",info->line); |
| 1303 | #endif |
| 1304 | DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line)); |
| 1305 | *R_IRQ_MASK1_CLR = (1U << (8+2*info->line)); |
| 1306 | } |
| 1307 | |
| 1308 | static inline void |
| 1309 | e100_enable_serial_data_irq(struct e100_serial *info) |
| 1310 | { |
| 1311 | #ifdef SERIAL_DEBUG_INTR |
| 1312 | printk("ser_irq(%d): 1\n",info->line); |
| 1313 | printk("**** %d = %d\n", |
| 1314 | (8+2*info->line), |
| 1315 | (1U << (8+2*info->line))); |
| 1316 | #endif |
| 1317 | DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line)); |
| 1318 | *R_IRQ_MASK1_SET = (1U << (8+2*info->line)); |
| 1319 | } |
| 1320 | #endif |
| 1321 | |
| 1322 | static inline void |
| 1323 | e100_disable_serial_tx_ready_irq(struct e100_serial *info) |
| 1324 | { |
| 1325 | #ifdef SERIAL_DEBUG_INTR |
| 1326 | printk("ser_tx_irq(%d): 0\n",info->line); |
| 1327 | #endif |
| 1328 | DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line)); |
| 1329 | *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line)); |
| 1330 | } |
| 1331 | |
| 1332 | static inline void |
| 1333 | e100_enable_serial_tx_ready_irq(struct e100_serial *info) |
| 1334 | { |
| 1335 | #ifdef SERIAL_DEBUG_INTR |
| 1336 | printk("ser_tx_irq(%d): 1\n",info->line); |
| 1337 | printk("**** %d = %d\n", |
| 1338 | (8+1+2*info->line), |
| 1339 | (1U << (8+1+2*info->line))); |
| 1340 | #endif |
| 1341 | DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line)); |
| 1342 | *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line)); |
| 1343 | } |
| 1344 | |
| 1345 | static inline void e100_enable_rx_irq(struct e100_serial *info) |
| 1346 | { |
| 1347 | if (info->uses_dma_in) |
| 1348 | e100_enable_rxdma_irq(info); |
| 1349 | else |
| 1350 | e100_enable_serial_data_irq(info); |
| 1351 | } |
| 1352 | static inline void e100_disable_rx_irq(struct e100_serial *info) |
| 1353 | { |
| 1354 | if (info->uses_dma_in) |
| 1355 | e100_disable_rxdma_irq(info); |
| 1356 | else |
| 1357 | e100_disable_serial_data_irq(info); |
| 1358 | } |
| 1359 | |
| 1360 | #if defined(CONFIG_ETRAX_RS485) |
| 1361 | /* Enable RS-485 mode on selected port. This is UGLY. */ |
| 1362 | static int |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1363 | e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | { |
| 1365 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 1366 | |
| 1367 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 1368 | *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit); |
| 1369 | #endif |
| 1370 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 1371 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 1372 | rs485_port_g_bit, 1); |
| 1373 | #endif |
| 1374 | #if defined(CONFIG_ETRAX_RS485_LTC1387) |
| 1375 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 1376 | CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1); |
| 1377 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 1378 | CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1); |
| 1379 | #endif |
| 1380 | |
Jesper Nilsson | c7213fc | 2010-10-28 12:08:27 +0200 | [diff] [blame] | 1381 | info->rs485 = *r; |
| 1382 | |
| 1383 | /* Maximum delay before RTS equal to 1000 */ |
| 1384 | if (info->rs485.delay_rts_before_send >= 1000) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | info->rs485.delay_rts_before_send = 1000; |
Jesper Nilsson | c7213fc | 2010-10-28 12:08:27 +0200 | [diff] [blame] | 1386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | /* printk("rts: on send = %i, after = %i, enabled = %i", |
| 1388 | info->rs485.rts_on_send, |
| 1389 | info->rs485.rts_after_sent, |
| 1390 | info->rs485.enabled |
| 1391 | ); |
| 1392 | */ |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | static int |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1397 | e100_write_rs485(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | const unsigned char *buf, int count) |
| 1399 | { |
| 1400 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1401 | int old_value = (info->rs485.flags) & SER_RS485_ENABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | |
| 1403 | /* rs485 is always implicitly enabled if we're using the ioctl() |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1404 | * but it doesn't have to be set in the serial_rs485 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | * (to be backward compatible with old apps) |
| 1406 | * So we store, set and restore it. |
| 1407 | */ |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1408 | info->rs485.flags |= SER_RS485_ENABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | /* rs_write now deals with RS485 if enabled */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1410 | count = rs_write(tty, buf, count); |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1411 | if (!old_value) |
| 1412 | info->rs485.flags &= ~(SER_RS485_ENABLED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | return count; |
| 1414 | } |
| 1415 | |
| 1416 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 1417 | /* Timer function to toggle RTS when using FAST_TIMER */ |
| 1418 | static void rs485_toggle_rts_timer_function(unsigned long data) |
| 1419 | { |
| 1420 | struct e100_serial *info = (struct e100_serial *)data; |
| 1421 | |
| 1422 | fast_timers_rs485[info->line].function = NULL; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1423 | e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 1425 | e100_enable_rx(info); |
| 1426 | e100_enable_rx_irq(info); |
| 1427 | #endif |
| 1428 | } |
| 1429 | #endif |
| 1430 | #endif /* CONFIG_ETRAX_RS485 */ |
| 1431 | |
| 1432 | /* |
| 1433 | * ------------------------------------------------------------ |
| 1434 | * rs_stop() and rs_start() |
| 1435 | * |
| 1436 | * This routines are called before setting or resetting tty->stopped. |
| 1437 | * They enable or disable transmitter using the XOFF registers, as necessary. |
| 1438 | * ------------------------------------------------------------ |
| 1439 | */ |
| 1440 | |
| 1441 | static void |
| 1442 | rs_stop(struct tty_struct *tty) |
| 1443 | { |
| 1444 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 1445 | if (info) { |
| 1446 | unsigned long flags; |
| 1447 | unsigned long xoff; |
| 1448 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1449 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n", |
| 1451 | CIRC_CNT(info->xmit.head, |
| 1452 | info->xmit.tail,SERIAL_XMIT_SIZE))); |
| 1453 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1454 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, |
| 1455 | STOP_CHAR(info->port.tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop); |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1457 | if (tty->termios.c_iflag & IXON ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 1459 | } |
| 1460 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1461 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1462 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | } |
| 1464 | } |
| 1465 | |
| 1466 | static void |
| 1467 | rs_start(struct tty_struct *tty) |
| 1468 | { |
| 1469 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 1470 | if (info) { |
| 1471 | unsigned long flags; |
| 1472 | unsigned long xoff; |
| 1473 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1474 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n", |
| 1476 | CIRC_CNT(info->xmit.head, |
| 1477 | info->xmit.tail,SERIAL_XMIT_SIZE))); |
| 1478 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty)); |
| 1479 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1480 | if (tty->termios.c_iflag & IXON ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 1482 | } |
| 1483 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1484 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | if (!info->uses_dma_out && |
| 1486 | info->xmit.head != info->xmit.tail && info->xmit.buf) |
| 1487 | e100_enable_serial_tx_ready_irq(info); |
| 1488 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1489 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | } |
| 1491 | } |
| 1492 | |
| 1493 | /* |
| 1494 | * ---------------------------------------------------------------------- |
| 1495 | * |
| 1496 | * Here starts the interrupt handling routines. All of the following |
| 1497 | * subroutines are declared as inline and are folded into |
| 1498 | * rs_interrupt(). They were separated out for readability's sake. |
| 1499 | * |
| 1500 | * Note: rs_interrupt() is a "fast" interrupt, which means that it |
| 1501 | * runs with interrupts turned off. People who may want to modify |
| 1502 | * rs_interrupt() should try to keep the interrupt handler as fast as |
| 1503 | * possible. After you are done making modifications, it is not a bad |
| 1504 | * idea to do: |
| 1505 | * |
| 1506 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c |
| 1507 | * |
| 1508 | * and look at the resulting assemble code in serial.s. |
| 1509 | * |
| 1510 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 |
| 1511 | * ----------------------------------------------------------------------- |
| 1512 | */ |
| 1513 | |
| 1514 | /* |
| 1515 | * This routine is used by the interrupt handler to schedule |
| 1516 | * processing in the software interrupt portion of the driver. |
| 1517 | */ |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1518 | static void rs_sched_event(struct e100_serial *info, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | { |
| 1520 | if (info->event & (1 << event)) |
| 1521 | return; |
| 1522 | info->event |= 1 << event; |
| 1523 | schedule_work(&info->work); |
| 1524 | } |
| 1525 | |
| 1526 | /* The output DMA channel is free - use it to send as many chars as possible |
| 1527 | * NOTES: |
| 1528 | * We don't pay attention to info->x_char, which means if the TTY wants to |
| 1529 | * use XON/XOFF it will set info->x_char but we won't send any X char! |
| 1530 | * |
| 1531 | * To implement this, we'd just start a DMA send of 1 byte pointing at a |
| 1532 | * buffer containing the X char, and skip updating xmit. We'd also have to |
| 1533 | * check if the last sent char was the X char when we enter this function |
| 1534 | * the next time, to avoid updating xmit with the sent X value. |
| 1535 | */ |
| 1536 | |
| 1537 | static void |
| 1538 | transmit_chars_dma(struct e100_serial *info) |
| 1539 | { |
| 1540 | unsigned int c, sentl; |
| 1541 | struct etrax_dma_descr *descr; |
| 1542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ |
| 1544 | *info->oclrintradr = |
| 1545 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 1546 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 1547 | |
| 1548 | #ifdef SERIAL_DEBUG_INTR |
| 1549 | if (info->line == SERIAL_DEBUG_LINE) |
| 1550 | printk("tc\n"); |
| 1551 | #endif |
| 1552 | if (!info->tr_running) { |
| 1553 | /* weirdo... we shouldn't get here! */ |
| 1554 | printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n"); |
| 1555 | return; |
| 1556 | } |
| 1557 | |
| 1558 | descr = &info->tr_descr; |
| 1559 | |
| 1560 | /* first get the amount of bytes sent during the last DMA transfer, |
| 1561 | and update xmit accordingly */ |
| 1562 | |
| 1563 | /* if the stop bit was not set, all data has been sent */ |
| 1564 | if (!(descr->status & d_stop)) { |
| 1565 | sentl = descr->sw_len; |
| 1566 | } else |
| 1567 | /* otherwise we find the amount of data sent here */ |
| 1568 | sentl = descr->hw_len; |
| 1569 | |
| 1570 | DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl)); |
| 1571 | |
| 1572 | /* update stats */ |
| 1573 | info->icount.tx += sentl; |
| 1574 | |
| 1575 | /* update xmit buffer */ |
| 1576 | info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1); |
| 1577 | |
| 1578 | /* if there is only a few chars left in the buf, wake up the blocked |
| 1579 | write if any */ |
| 1580 | if (CIRC_CNT(info->xmit.head, |
| 1581 | info->xmit.tail, |
| 1582 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 1583 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 1584 | |
| 1585 | /* find out the largest amount of consecutive bytes we want to send now */ |
| 1586 | |
| 1587 | c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 1588 | |
| 1589 | /* Don't send all in one DMA transfer - divide it so we wake up |
| 1590 | * application before all is sent |
| 1591 | */ |
| 1592 | |
| 1593 | if (c >= 4*WAKEUP_CHARS) |
| 1594 | c = c/2; |
| 1595 | |
| 1596 | if (c <= 0) { |
| 1597 | /* our job here is done, don't schedule any new DMA transfer */ |
| 1598 | info->tr_running = 0; |
| 1599 | |
| 1600 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1601 | if (info->rs485.flags & SER_RS485_ENABLED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | /* Set a short timer to toggle RTS */ |
| 1603 | start_one_shot_timer(&fast_timers_rs485[info->line], |
| 1604 | rs485_toggle_rts_timer_function, |
| 1605 | (unsigned long)info, |
| 1606 | info->char_time_usec*2, |
| 1607 | "RS-485"); |
| 1608 | } |
| 1609 | #endif /* RS485 */ |
| 1610 | return; |
| 1611 | } |
| 1612 | |
| 1613 | /* ok we can schedule a dma send of c chars starting at info->xmit.tail */ |
| 1614 | /* set up the descriptor correctly for output */ |
| 1615 | DFLOW(DEBUG_LOG(info->line, "TX %i\n", c)); |
| 1616 | descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */ |
| 1617 | descr->sw_len = c; |
| 1618 | descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail); |
| 1619 | descr->status = 0; |
| 1620 | |
| 1621 | *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */ |
| 1622 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); |
| 1623 | |
| 1624 | /* DMA is now running (hopefully) */ |
| 1625 | } /* transmit_chars_dma */ |
| 1626 | |
| 1627 | static void |
| 1628 | start_transmit(struct e100_serial *info) |
| 1629 | { |
| 1630 | #if 0 |
| 1631 | if (info->line == SERIAL_DEBUG_LINE) |
| 1632 | printk("x\n"); |
| 1633 | #endif |
| 1634 | |
| 1635 | info->tr_descr.sw_len = 0; |
| 1636 | info->tr_descr.hw_len = 0; |
| 1637 | info->tr_descr.status = 0; |
| 1638 | info->tr_running = 1; |
| 1639 | if (info->uses_dma_out) |
| 1640 | transmit_chars_dma(info); |
| 1641 | else |
| 1642 | e100_enable_serial_tx_ready_irq(info); |
| 1643 | } /* start_transmit */ |
| 1644 | |
| 1645 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 1646 | static int serial_fast_timer_started = 0; |
| 1647 | static int serial_fast_timer_expired = 0; |
| 1648 | static void flush_timeout_function(unsigned long data); |
| 1649 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\ |
| 1650 | unsigned long timer_flags; \ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1651 | local_irq_save(timer_flags); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | if (fast_timers[info->line].function == NULL) { \ |
| 1653 | serial_fast_timer_started++; \ |
| 1654 | TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \ |
| 1655 | TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \ |
| 1656 | start_one_shot_timer(&fast_timers[info->line], \ |
| 1657 | flush_timeout_function, \ |
| 1658 | (unsigned long)info, \ |
| 1659 | (usec), \ |
| 1660 | string); \ |
| 1661 | } \ |
| 1662 | else { \ |
| 1663 | TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \ |
| 1664 | } \ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1665 | local_irq_restore(timer_flags); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | } |
| 1667 | #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec) |
| 1668 | |
| 1669 | #else |
| 1670 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) |
| 1671 | #define START_FLUSH_FAST_TIMER(info, string) |
| 1672 | #endif |
| 1673 | |
| 1674 | static struct etrax_recv_buffer * |
| 1675 | alloc_recv_buffer(unsigned int size) |
| 1676 | { |
| 1677 | struct etrax_recv_buffer *buffer; |
| 1678 | |
| 1679 | if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC))) |
| 1680 | return NULL; |
| 1681 | |
| 1682 | buffer->next = NULL; |
| 1683 | buffer->length = 0; |
| 1684 | buffer->error = TTY_NORMAL; |
| 1685 | |
| 1686 | return buffer; |
| 1687 | } |
| 1688 | |
| 1689 | static void |
| 1690 | append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer) |
| 1691 | { |
| 1692 | unsigned long flags; |
| 1693 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1694 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | |
| 1696 | if (!info->first_recv_buffer) |
| 1697 | info->first_recv_buffer = buffer; |
| 1698 | else |
| 1699 | info->last_recv_buffer->next = buffer; |
| 1700 | |
| 1701 | info->last_recv_buffer = buffer; |
| 1702 | |
| 1703 | info->recv_cnt += buffer->length; |
| 1704 | if (info->recv_cnt > info->max_recv_cnt) |
| 1705 | info->max_recv_cnt = info->recv_cnt; |
| 1706 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1707 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | } |
| 1709 | |
| 1710 | static int |
| 1711 | add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag) |
| 1712 | { |
| 1713 | struct etrax_recv_buffer *buffer; |
| 1714 | if (info->uses_dma_in) { |
| 1715 | if (!(buffer = alloc_recv_buffer(4))) |
| 1716 | return 0; |
| 1717 | |
| 1718 | buffer->length = 1; |
| 1719 | buffer->error = flag; |
| 1720 | buffer->buffer[0] = data; |
| 1721 | |
| 1722 | append_recv_buffer(info, buffer); |
| 1723 | |
| 1724 | info->icount.rx++; |
| 1725 | } else { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 1726 | tty_insert_flip_char(&info->port, data, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | info->icount.rx++; |
| 1728 | } |
| 1729 | |
| 1730 | return 1; |
| 1731 | } |
| 1732 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1733 | static unsigned int handle_descr_data(struct e100_serial *info, |
| 1734 | struct etrax_dma_descr *descr, |
| 1735 | unsigned int recvl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | { |
| 1737 | struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer; |
| 1738 | |
| 1739 | if (info->recv_cnt + recvl > 65536) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 1740 | printk(KERN_WARNING |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1741 | "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | return 0; |
| 1743 | } |
| 1744 | |
| 1745 | buffer->length = recvl; |
| 1746 | |
| 1747 | if (info->errorcode == ERRCODE_SET_BREAK) |
| 1748 | buffer->error = TTY_BREAK; |
| 1749 | info->errorcode = 0; |
| 1750 | |
| 1751 | append_recv_buffer(info, buffer); |
| 1752 | |
| 1753 | if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE))) |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1754 | panic("%s: Failed to allocate memory for receive buffer!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | |
| 1756 | descr->buf = virt_to_phys(buffer->buffer); |
| 1757 | |
| 1758 | return recvl; |
| 1759 | } |
| 1760 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1761 | static unsigned int handle_all_descr_data(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | { |
| 1763 | struct etrax_dma_descr *descr; |
| 1764 | unsigned int recvl; |
| 1765 | unsigned int ret = 0; |
| 1766 | |
| 1767 | while (1) |
| 1768 | { |
| 1769 | descr = &info->rec_descr[info->cur_rec_descr]; |
| 1770 | |
| 1771 | if (descr == phys_to_virt(*info->idescradr)) |
| 1772 | break; |
| 1773 | |
| 1774 | if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS) |
| 1775 | info->cur_rec_descr = 0; |
| 1776 | |
| 1777 | /* find out how many bytes were read */ |
| 1778 | |
| 1779 | /* if the eop bit was not set, all data has been received */ |
| 1780 | if (!(descr->status & d_eop)) { |
| 1781 | recvl = descr->sw_len; |
| 1782 | } else { |
| 1783 | /* otherwise we find the amount of data received here */ |
| 1784 | recvl = descr->hw_len; |
| 1785 | } |
| 1786 | |
| 1787 | /* Reset the status information */ |
| 1788 | descr->status = 0; |
| 1789 | |
| 1790 | DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl); |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1791 | if (info->port.tty->stopped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | unsigned char *buf = phys_to_virt(descr->buf); |
| 1793 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]); |
| 1794 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]); |
| 1795 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]); |
| 1796 | } |
| 1797 | ); |
| 1798 | |
| 1799 | /* update stats */ |
| 1800 | info->icount.rx += recvl; |
| 1801 | |
| 1802 | ret += handle_descr_data(info, descr, recvl); |
| 1803 | } |
| 1804 | |
| 1805 | return ret; |
| 1806 | } |
| 1807 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1808 | static void receive_chars_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | { |
| 1810 | struct tty_struct *tty; |
| 1811 | unsigned char rstat; |
| 1812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ |
| 1814 | *info->iclrintradr = |
| 1815 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 1816 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 1817 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1818 | tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | if (!tty) /* Something wrong... */ |
| 1820 | return; |
| 1821 | |
| 1822 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 1823 | if (info->uses_dma_in) |
| 1824 | e100_enable_serial_data_irq(info); |
| 1825 | #endif |
| 1826 | |
| 1827 | if (info->errorcode == ERRCODE_INSERT_BREAK) |
| 1828 | add_char_and_flag(info, '\0', TTY_BREAK); |
| 1829 | |
| 1830 | handle_all_descr_data(info); |
| 1831 | |
| 1832 | /* Read the status register to detect errors */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1833 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
| 1835 | DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat)); |
| 1836 | } |
| 1837 | |
| 1838 | if (rstat & SER_ERROR_MASK) { |
| 1839 | /* If we got an error, we must reset it by reading the |
| 1840 | * data_in field |
| 1841 | */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1842 | unsigned char data = info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
| 1844 | PROCSTAT(ser_stat[info->line].errors_cnt++); |
| 1845 | DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n", |
| 1846 | ((rstat & SER_ERROR_MASK) << 8) | data); |
| 1847 | |
| 1848 | if (rstat & SER_PAR_ERR_MASK) |
| 1849 | add_char_and_flag(info, data, TTY_PARITY); |
| 1850 | else if (rstat & SER_OVERRUN_MASK) |
| 1851 | add_char_and_flag(info, data, TTY_OVERRUN); |
| 1852 | else if (rstat & SER_FRAMING_ERR_MASK) |
| 1853 | add_char_and_flag(info, data, TTY_FRAME); |
| 1854 | } |
| 1855 | |
| 1856 | START_FLUSH_FAST_TIMER(info, "receive_chars"); |
| 1857 | |
| 1858 | /* Restart the receiving DMA */ |
| 1859 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); |
| 1860 | } |
| 1861 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1862 | static int start_recv_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | { |
| 1864 | struct etrax_dma_descr *descr = info->rec_descr; |
| 1865 | struct etrax_recv_buffer *buffer; |
| 1866 | int i; |
| 1867 | |
| 1868 | /* Set up the receiving descriptors */ |
| 1869 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) { |
| 1870 | if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE))) |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1871 | panic("%s: Failed to allocate memory for receive buffer!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | |
| 1873 | descr[i].ctrl = d_int; |
| 1874 | descr[i].buf = virt_to_phys(buffer->buffer); |
| 1875 | descr[i].sw_len = SERIAL_DESCR_BUF_SIZE; |
| 1876 | descr[i].hw_len = 0; |
| 1877 | descr[i].status = 0; |
| 1878 | descr[i].next = virt_to_phys(&descr[i+1]); |
| 1879 | } |
| 1880 | |
| 1881 | /* Link the last descriptor to the first */ |
| 1882 | descr[i-1].next = virt_to_phys(&descr[0]); |
| 1883 | |
| 1884 | /* Start with the first descriptor in the list */ |
| 1885 | info->cur_rec_descr = 0; |
| 1886 | |
| 1887 | /* Start the DMA */ |
| 1888 | *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]); |
| 1889 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); |
| 1890 | |
| 1891 | /* Input DMA should be running now */ |
| 1892 | return 1; |
| 1893 | } |
| 1894 | |
| 1895 | static void |
| 1896 | start_receive(struct e100_serial *info) |
| 1897 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | if (info->uses_dma_in) { |
| 1899 | /* reset the input dma channel to be sure it works */ |
| 1900 | |
| 1901 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 1902 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == |
| 1903 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 1904 | |
| 1905 | start_recv_dma(info); |
| 1906 | } |
| 1907 | } |
| 1908 | |
| 1909 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | /* the bits in the MASK2 register are laid out like this: |
| 1911 | DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR |
| 1912 | where I is the input channel and O is the output channel for the port. |
| 1913 | info->irq is the bit number for the DMAO_DESCR so to check the others we |
| 1914 | shift info->irq to the left. |
| 1915 | */ |
| 1916 | |
| 1917 | /* dma output channel interrupt handler |
| 1918 | this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or |
| 1919 | DMA8(ser1) when they have finished a descriptor with the intr flag set. |
| 1920 | */ |
| 1921 | |
| 1922 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1923 | tr_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | { |
| 1925 | struct e100_serial *info; |
| 1926 | unsigned long ireg; |
| 1927 | int i; |
| 1928 | int handled = 0; |
| 1929 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | /* find out the line that caused this irq and get it from rs_table */ |
| 1931 | |
| 1932 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ |
| 1933 | |
| 1934 | for (i = 0; i < NR_PORTS; i++) { |
| 1935 | info = rs_table + i; |
| 1936 | if (!info->enabled || !info->uses_dma_out) |
| 1937 | continue; |
| 1938 | /* check for dma_descr (don't need to check for dma_eop in output dma for serial */ |
| 1939 | if (ireg & info->irq) { |
| 1940 | handled = 1; |
| 1941 | /* we can send a new dma bunch. make it so. */ |
| 1942 | DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i)); |
| 1943 | /* Read jiffies_usec first, |
| 1944 | * we want this time to be as late as possible |
| 1945 | */ |
| 1946 | PROCSTAT(ser_stat[info->line].tx_dma_ints++); |
| 1947 | info->last_tx_active_usec = GET_JIFFIES_USEC(); |
| 1948 | info->last_tx_active = jiffies; |
| 1949 | transmit_chars_dma(info); |
| 1950 | } |
| 1951 | |
| 1952 | /* FIXME: here we should really check for a change in the |
| 1953 | status lines and if so call status_handle(info) */ |
| 1954 | } |
| 1955 | return IRQ_RETVAL(handled); |
| 1956 | } /* tr_interrupt */ |
| 1957 | |
| 1958 | /* dma input channel interrupt handler */ |
| 1959 | |
| 1960 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1961 | rec_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | { |
| 1963 | struct e100_serial *info; |
| 1964 | unsigned long ireg; |
| 1965 | int i; |
| 1966 | int handled = 0; |
| 1967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | /* find out the line that caused this irq and get it from rs_table */ |
| 1969 | |
| 1970 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ |
| 1971 | |
| 1972 | for (i = 0; i < NR_PORTS; i++) { |
| 1973 | info = rs_table + i; |
| 1974 | if (!info->enabled || !info->uses_dma_in) |
| 1975 | continue; |
| 1976 | /* check for both dma_eop and dma_descr for the input dma channel */ |
| 1977 | if (ireg & ((info->irq << 2) | (info->irq << 3))) { |
| 1978 | handled = 1; |
| 1979 | /* we have received something */ |
| 1980 | receive_chars_dma(info); |
| 1981 | } |
| 1982 | |
| 1983 | /* FIXME: here we should really check for a change in the |
| 1984 | status lines and if so call status_handle(info) */ |
| 1985 | } |
| 1986 | return IRQ_RETVAL(handled); |
| 1987 | } /* rec_interrupt */ |
| 1988 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1989 | static int force_eop_if_needed(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | { |
| 1991 | /* We check data_avail bit to determine if data has |
| 1992 | * arrived since last time |
| 1993 | */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1994 | unsigned char rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | |
| 1996 | /* error or datavail? */ |
| 1997 | if (rstat & SER_ERROR_MASK) { |
| 1998 | /* Some error has occurred. If there has been valid data, an |
| 1999 | * EOP interrupt will be made automatically. If no data, the |
| 2000 | * normal ser_interrupt should be enabled and handle it. |
| 2001 | * So do nothing! |
| 2002 | */ |
| 2003 | DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n", |
| 2004 | rstat | (info->line << 8)); |
| 2005 | return 0; |
| 2006 | } |
| 2007 | |
| 2008 | if (rstat & SER_DATA_AVAIL_MASK) { |
| 2009 | /* Ok data, no error, count it */ |
| 2010 | TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n", |
| 2011 | rstat | (info->line << 8))); |
| 2012 | /* Read data to clear status flags */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2013 | (void)info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | |
| 2015 | info->forced_eop = 0; |
| 2016 | START_FLUSH_FAST_TIMER(info, "magic"); |
| 2017 | return 0; |
| 2018 | } |
| 2019 | |
| 2020 | /* hit the timeout, force an EOP for the input |
| 2021 | * dma channel if we haven't already |
| 2022 | */ |
| 2023 | if (!info->forced_eop) { |
| 2024 | info->forced_eop = 1; |
| 2025 | PROCSTAT(ser_stat[info->line].timeout_flush_cnt++); |
| 2026 | TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line)); |
| 2027 | FORCE_EOP(info); |
| 2028 | } |
| 2029 | |
| 2030 | return 1; |
| 2031 | } |
| 2032 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2033 | static void flush_to_flip_buffer(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | struct etrax_recv_buffer *buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2038 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | |
Alan Cox | 2090ab0 | 2007-10-16 01:26:38 -0700 | [diff] [blame] | 2040 | while ((buffer = info->first_recv_buffer) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | unsigned int count = buffer->length; |
| 2042 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 2043 | tty_insert_flip_string(&info->port, buffer->buffer, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | info->recv_cnt -= count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | |
| 2046 | if (count == buffer->length) { |
| 2047 | info->first_recv_buffer = buffer->next; |
| 2048 | kfree(buffer); |
| 2049 | } else { |
| 2050 | buffer->length -= count; |
| 2051 | memmove(buffer->buffer, buffer->buffer + count, buffer->length); |
| 2052 | buffer->error = TTY_NORMAL; |
| 2053 | } |
| 2054 | } |
| 2055 | |
| 2056 | if (!info->first_recv_buffer) |
| 2057 | info->last_recv_buffer = NULL; |
| 2058 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2059 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2061 | /* This includes a check for low-latency */ |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 2062 | tty_flip_buffer_push(&info->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | } |
| 2064 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2065 | static void check_flush_timeout(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | { |
| 2067 | /* Flip what we've got (if we can) */ |
| 2068 | flush_to_flip_buffer(info); |
| 2069 | |
| 2070 | /* We might need to flip later, but not to fast |
| 2071 | * since the system is busy processing input... */ |
| 2072 | if (info->first_recv_buffer) |
| 2073 | START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000); |
| 2074 | |
| 2075 | /* Force eop last, since data might have come while we're processing |
| 2076 | * and if we started the slow timer above, we won't start a fast |
| 2077 | * below. |
| 2078 | */ |
| 2079 | force_eop_if_needed(info); |
| 2080 | } |
| 2081 | |
| 2082 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 2083 | static void flush_timeout_function(unsigned long data) |
| 2084 | { |
| 2085 | struct e100_serial *info = (struct e100_serial *)data; |
| 2086 | |
| 2087 | fast_timers[info->line].function = NULL; |
| 2088 | serial_fast_timer_expired++; |
Masanari Iida | 8faaaea | 2014-01-07 21:58:06 +0900 | [diff] [blame] | 2089 | TIMERD(DEBUG_LOG(info->line, "flush_timeout %i ", info->line)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired)); |
| 2091 | check_flush_timeout(info); |
| 2092 | } |
| 2093 | |
| 2094 | #else |
| 2095 | |
| 2096 | /* dma fifo/buffer timeout handler |
| 2097 | forces an end-of-packet for the dma input channel if no chars |
| 2098 | have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s. |
| 2099 | */ |
| 2100 | |
| 2101 | static struct timer_list flush_timer; |
| 2102 | |
| 2103 | static void |
| 2104 | timed_flush_handler(unsigned long ptr) |
| 2105 | { |
| 2106 | struct e100_serial *info; |
| 2107 | int i; |
| 2108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | for (i = 0; i < NR_PORTS; i++) { |
| 2110 | info = rs_table + i; |
| 2111 | if (info->uses_dma_in) |
| 2112 | check_flush_timeout(info); |
| 2113 | } |
| 2114 | |
| 2115 | /* restart flush timer */ |
| 2116 | mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS); |
| 2117 | } |
| 2118 | #endif |
| 2119 | |
| 2120 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 2121 | |
| 2122 | /* If there is an error (ie break) when the DMA is running and |
| 2123 | * there are no bytes in the fifo the DMA is stopped and we get no |
| 2124 | * eop interrupt. Thus we have to monitor the first bytes on a DMA |
| 2125 | * transfer, and if it is without error we can turn the serial |
| 2126 | * interrupts off. |
| 2127 | */ |
| 2128 | |
| 2129 | /* |
| 2130 | BREAK handling on ETRAX 100: |
| 2131 | ETRAX will generate interrupt although there is no stop bit between the |
| 2132 | characters. |
| 2133 | |
| 2134 | Depending on how long the break sequence is, the end of the breaksequence |
| 2135 | will look differently: |
| 2136 | | indicates start/end of a character. |
| 2137 | |
| 2138 | B= Break character (0x00) with framing error. |
| 2139 | E= Error byte with parity error received after B characters. |
| 2140 | F= "Faked" valid byte received immediately after B characters. |
| 2141 | V= Valid byte |
| 2142 | |
| 2143 | 1. |
| 2144 | B BL ___________________________ V |
| 2145 | .._|__________|__________| |valid data | |
| 2146 | |
| 2147 | Multiple frame errors with data == 0x00 (B), |
| 2148 | the timing matches up "perfectly" so no extra ending char is detected. |
| 2149 | The RXD pin is 1 in the last interrupt, in that case |
| 2150 | we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really |
| 2151 | know if another byte will come and this really is case 2. below |
| 2152 | (e.g F=0xFF or 0xFE) |
| 2153 | If RXD pin is 0 we can expect another character (see 2. below). |
| 2154 | |
| 2155 | |
| 2156 | 2. |
| 2157 | |
| 2158 | B B E or F__________________..__ V |
| 2159 | .._|__________|__________|______ | |valid data |
| 2160 | "valid" or |
| 2161 | parity error |
| 2162 | |
| 2163 | Multiple frame errors with data == 0x00 (B), |
| 2164 | but the part of the break trigs is interpreted as a start bit (and possibly |
| 2165 | some 0 bits followed by a number of 1 bits and a stop bit). |
| 2166 | Depending on parity settings etc. this last character can be either |
| 2167 | a fake "valid" char (F) or have a parity error (E). |
| 2168 | |
| 2169 | If the character is valid it will be put in the buffer, |
| 2170 | we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt |
| 2171 | will set the flags so the tty will handle it, |
| 2172 | if it's an error byte it will not be put in the buffer |
| 2173 | and we set info->errorcode = ERRCODE_INSERT_BREAK. |
| 2174 | |
| 2175 | To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp |
| 2176 | of the last faulty char (B) and compares it with the current time: |
| 2177 | If the time elapsed time is less then 2*char_time_usec we will assume |
| 2178 | it's a faked F char and not a Valid char and set |
| 2179 | info->errorcode = ERRCODE_SET_BREAK. |
| 2180 | |
| 2181 | Flaws in the above solution: |
| 2182 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 2183 | We use the timer to distinguish a F character from a V character, |
| 2184 | if a V character is to close after the break we might make the wrong decision. |
| 2185 | |
| 2186 | TODO: The break will be delayed until an F or V character is received. |
| 2187 | |
| 2188 | */ |
| 2189 | |
Jiri Slaby | 12aad55 | 2013-03-07 13:12:35 +0100 | [diff] [blame] | 2190 | static void handle_ser_rx_interrupt_no_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | { |
| 2192 | unsigned long data_read; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | /* Read data and status at the same time */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2195 | data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | more_data: |
| 2197 | if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) { |
| 2198 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); |
| 2199 | } |
| 2200 | DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read))); |
| 2201 | |
| 2202 | if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) | |
| 2203 | IO_MASK(R_SERIAL0_READ, par_err) | |
| 2204 | IO_MASK(R_SERIAL0_READ, overrun) )) { |
| 2205 | /* An error */ |
| 2206 | info->last_rx_active_usec = GET_JIFFIES_USEC(); |
| 2207 | info->last_rx_active = jiffies; |
| 2208 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read)); |
| 2209 | DLOG_INT_TRIG( |
| 2210 | if (!log_int_trig1_pos) { |
| 2211 | log_int_trig1_pos = log_int_pos; |
| 2212 | log_int(rdpc(), 0, 0); |
| 2213 | } |
| 2214 | ); |
| 2215 | |
| 2216 | |
| 2217 | if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) && |
| 2218 | (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) { |
| 2219 | /* Most likely a break, but we get interrupts over and |
| 2220 | * over again. |
| 2221 | */ |
| 2222 | |
| 2223 | if (!info->break_detected_cnt) { |
| 2224 | DEBUG_LOG(info->line, "#BRK start\n", 0); |
| 2225 | } |
| 2226 | if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) { |
| 2227 | /* The RX pin is high now, so the break |
| 2228 | * must be over, but.... |
| 2229 | * we can't really know if we will get another |
| 2230 | * last byte ending the break or not. |
| 2231 | * And we don't know if the byte (if any) will |
| 2232 | * have an error or look valid. |
| 2233 | */ |
| 2234 | DEBUG_LOG(info->line, "# BL BRK\n", 0); |
| 2235 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2236 | } |
| 2237 | info->break_detected_cnt++; |
| 2238 | } else { |
| 2239 | /* The error does not look like a break, but could be |
| 2240 | * the end of one |
| 2241 | */ |
| 2242 | if (info->break_detected_cnt) { |
| 2243 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); |
| 2244 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2245 | } else { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2246 | unsigned char data = IO_EXTRACT(R_SERIAL0_READ, |
| 2247 | data_in, data_read); |
| 2248 | char flag = TTY_NORMAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2250 | tty_insert_flip_char(&info->port, 0, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | info->icount.rx++; |
| 2252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | |
| 2254 | if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) { |
| 2255 | info->icount.parity++; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2256 | flag = TTY_PARITY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) { |
| 2258 | info->icount.overrun++; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2259 | flag = TTY_OVERRUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) { |
| 2261 | info->icount.frame++; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2262 | flag = TTY_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | } |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2264 | tty_insert_flip_char(&info->port, data, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | info->errorcode = 0; |
| 2266 | } |
| 2267 | info->break_detected_cnt = 0; |
| 2268 | } |
| 2269 | } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
| 2270 | /* No error */ |
| 2271 | DLOG_INT_TRIG( |
| 2272 | if (!log_int_trig1_pos) { |
| 2273 | if (log_int_pos >= log_int_size) { |
| 2274 | log_int_pos = 0; |
| 2275 | } |
| 2276 | log_int_trig0_pos = log_int_pos; |
| 2277 | log_int(rdpc(), 0, 0); |
| 2278 | } |
| 2279 | ); |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2280 | tty_insert_flip_char(&info->port, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2281 | IO_EXTRACT(R_SERIAL0_READ, data_in, data_read), |
| 2282 | TTY_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | } else { |
| 2284 | DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read); |
| 2285 | } |
| 2286 | |
| 2287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | info->icount.rx++; |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2289 | data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
| 2291 | DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)); |
| 2292 | goto more_data; |
| 2293 | } |
| 2294 | |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 2295 | tty_flip_buffer_push(&info->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | } |
| 2297 | |
Jiri Slaby | 12aad55 | 2013-03-07 13:12:35 +0100 | [diff] [blame] | 2298 | static void handle_ser_rx_interrupt(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | { |
| 2300 | unsigned char rstat; |
| 2301 | |
| 2302 | #ifdef SERIAL_DEBUG_INTR |
| 2303 | printk("Interrupt from serport %d\n", i); |
| 2304 | #endif |
| 2305 | /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */ |
| 2306 | if (!info->uses_dma_in) { |
Jiri Slaby | 12aad55 | 2013-03-07 13:12:35 +0100 | [diff] [blame] | 2307 | handle_ser_rx_interrupt_no_dma(info); |
| 2308 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | } |
| 2310 | /* DMA is used */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2311 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
| 2313 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); |
| 2314 | } |
| 2315 | |
| 2316 | if (rstat & SER_ERROR_MASK) { |
| 2317 | unsigned char data; |
| 2318 | |
| 2319 | info->last_rx_active_usec = GET_JIFFIES_USEC(); |
| 2320 | info->last_rx_active = jiffies; |
| 2321 | /* If we got an error, we must reset it by reading the |
| 2322 | * data_in field |
| 2323 | */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2324 | data = info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data)); |
| 2326 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat)); |
| 2327 | if (!data && (rstat & SER_FRAMING_ERR_MASK)) { |
| 2328 | /* Most likely a break, but we get interrupts over and |
| 2329 | * over again. |
| 2330 | */ |
| 2331 | |
| 2332 | if (!info->break_detected_cnt) { |
| 2333 | DEBUG_LOG(info->line, "#BRK start\n", 0); |
| 2334 | } |
| 2335 | if (rstat & SER_RXD_MASK) { |
| 2336 | /* The RX pin is high now, so the break |
| 2337 | * must be over, but.... |
| 2338 | * we can't really know if we will get another |
| 2339 | * last byte ending the break or not. |
| 2340 | * And we don't know if the byte (if any) will |
| 2341 | * have an error or look valid. |
| 2342 | */ |
| 2343 | DEBUG_LOG(info->line, "# BL BRK\n", 0); |
| 2344 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2345 | } |
| 2346 | info->break_detected_cnt++; |
| 2347 | } else { |
| 2348 | /* The error does not look like a break, but could be |
| 2349 | * the end of one |
| 2350 | */ |
| 2351 | if (info->break_detected_cnt) { |
| 2352 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); |
| 2353 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2354 | } else { |
| 2355 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
| 2356 | info->icount.brk++; |
| 2357 | add_char_and_flag(info, '\0', TTY_BREAK); |
| 2358 | } |
| 2359 | |
| 2360 | if (rstat & SER_PAR_ERR_MASK) { |
| 2361 | info->icount.parity++; |
| 2362 | add_char_and_flag(info, data, TTY_PARITY); |
| 2363 | } else if (rstat & SER_OVERRUN_MASK) { |
| 2364 | info->icount.overrun++; |
| 2365 | add_char_and_flag(info, data, TTY_OVERRUN); |
| 2366 | } else if (rstat & SER_FRAMING_ERR_MASK) { |
| 2367 | info->icount.frame++; |
| 2368 | add_char_and_flag(info, data, TTY_FRAME); |
| 2369 | } |
| 2370 | |
| 2371 | info->errorcode = 0; |
| 2372 | } |
| 2373 | info->break_detected_cnt = 0; |
| 2374 | DEBUG_LOG(info->line, "#iERR s d %04X\n", |
| 2375 | ((rstat & SER_ERROR_MASK) << 8) | data); |
| 2376 | } |
| 2377 | PROCSTAT(ser_stat[info->line].early_errors_cnt++); |
| 2378 | } else { /* It was a valid byte, now let the DMA do the rest */ |
| 2379 | unsigned long curr_time_u = GET_JIFFIES_USEC(); |
| 2380 | unsigned long curr_time = jiffies; |
| 2381 | |
| 2382 | if (info->break_detected_cnt) { |
| 2383 | /* Detect if this character is a new valid char or the |
| 2384 | * last char in a break sequence: If LSBits are 0 and |
| 2385 | * MSBits are high AND the time is close to the |
| 2386 | * previous interrupt we should discard it. |
| 2387 | */ |
| 2388 | long elapsed_usec = |
| 2389 | (curr_time - info->last_rx_active) * (1000000/HZ) + |
| 2390 | curr_time_u - info->last_rx_active_usec; |
| 2391 | if (elapsed_usec < 2*info->char_time_usec) { |
| 2392 | DEBUG_LOG(info->line, "FBRK %i\n", info->line); |
| 2393 | /* Report as BREAK (error) and let |
| 2394 | * receive_chars_dma() handle it |
| 2395 | */ |
| 2396 | info->errorcode = ERRCODE_SET_BREAK; |
| 2397 | } else { |
| 2398 | DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line); |
| 2399 | } |
| 2400 | DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt); |
| 2401 | } |
| 2402 | |
| 2403 | #ifdef SERIAL_DEBUG_INTR |
| 2404 | printk("** OK, disabling ser_interrupts\n"); |
| 2405 | #endif |
| 2406 | e100_disable_serial_data_irq(info); |
| 2407 | DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line)); |
| 2408 | info->break_detected_cnt = 0; |
| 2409 | |
| 2410 | PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++); |
| 2411 | } |
| 2412 | /* Restarting the DMA never hurts */ |
| 2413 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); |
| 2414 | START_FLUSH_FAST_TIMER(info, "ser_int"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | } /* handle_ser_rx_interrupt */ |
| 2416 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2417 | static void handle_ser_tx_interrupt(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | { |
| 2419 | unsigned long flags; |
| 2420 | |
| 2421 | if (info->x_char) { |
| 2422 | unsigned char rstat; |
| 2423 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char)); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2424 | local_irq_save(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2425 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
| 2427 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2428 | info->ioport[REG_TR_DATA] = info->x_char; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | info->icount.tx++; |
| 2430 | info->x_char = 0; |
| 2431 | /* We must enable since it is disabled in ser_interrupt */ |
| 2432 | e100_enable_serial_tx_ready_irq(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2433 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | return; |
| 2435 | } |
| 2436 | if (info->uses_dma_out) { |
| 2437 | unsigned char rstat; |
| 2438 | int i; |
| 2439 | /* We only use normal tx interrupt when sending x_char */ |
| 2440 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0)); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2441 | local_irq_save(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2442 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
| 2444 | e100_disable_serial_tx_ready_irq(info); |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2445 | if (info->port.tty->stopped) |
| 2446 | rs_stop(info->port.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | /* Enable the DMA channel and tell it to continue */ |
| 2448 | e100_enable_txdma_channel(info); |
| 2449 | /* Wait 12 cycles before doing the DMA command */ |
| 2450 | for(i = 6; i > 0; i--) |
| 2451 | nop(); |
| 2452 | |
| 2453 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2454 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | return; |
| 2456 | } |
| 2457 | /* Normal char-by-char interrupt */ |
| 2458 | if (info->xmit.head == info->xmit.tail |
Jiri Slaby | ee79706 | 2013-03-07 13:12:34 +0100 | [diff] [blame] | 2459 | || info->port.tty->stopped) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2460 | DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", |
| 2461 | info->port.tty->stopped)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | e100_disable_serial_tx_ready_irq(info); |
| 2463 | info->tr_running = 0; |
| 2464 | return; |
| 2465 | } |
| 2466 | DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail])); |
| 2467 | /* Send a byte, rs485 timing is critical so turn of ints */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2468 | local_irq_save(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2469 | info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1); |
| 2471 | info->icount.tx++; |
| 2472 | if (info->xmit.head == info->xmit.tail) { |
| 2473 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 2474 | if (info->rs485.flags & SER_RS485_ENABLED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | /* Set a short timer to toggle RTS */ |
| 2476 | start_one_shot_timer(&fast_timers_rs485[info->line], |
| 2477 | rs485_toggle_rts_timer_function, |
| 2478 | (unsigned long)info, |
| 2479 | info->char_time_usec*2, |
| 2480 | "RS-485"); |
| 2481 | } |
| 2482 | #endif /* RS485 */ |
| 2483 | info->last_tx_active_usec = GET_JIFFIES_USEC(); |
| 2484 | info->last_tx_active = jiffies; |
| 2485 | e100_disable_serial_tx_ready_irq(info); |
| 2486 | info->tr_running = 0; |
| 2487 | DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0)); |
| 2488 | } else { |
| 2489 | /* We must enable since it is disabled in ser_interrupt */ |
| 2490 | e100_enable_serial_tx_ready_irq(info); |
| 2491 | } |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2492 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | |
| 2494 | if (CIRC_CNT(info->xmit.head, |
| 2495 | info->xmit.tail, |
| 2496 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 2497 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 2498 | |
| 2499 | } /* handle_ser_tx_interrupt */ |
| 2500 | |
| 2501 | /* result of time measurements: |
| 2502 | * RX duration 54-60 us when doing something, otherwise 6-9 us |
| 2503 | * ser_int duration: just sending: 8-15 us normally, up to 73 us |
| 2504 | */ |
| 2505 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2506 | ser_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2507 | { |
| 2508 | static volatile int tx_started = 0; |
| 2509 | struct e100_serial *info; |
| 2510 | int i; |
| 2511 | unsigned long flags; |
| 2512 | unsigned long irq_mask1_rd; |
| 2513 | unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */ |
| 2514 | int handled = 0; |
| 2515 | static volatile unsigned long reentered_ready_mask = 0; |
| 2516 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2517 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | irq_mask1_rd = *R_IRQ_MASK1_RD; |
| 2519 | /* First handle all rx interrupts with ints disabled */ |
| 2520 | info = rs_table; |
| 2521 | irq_mask1_rd &= e100_ser_int_mask; |
| 2522 | for (i = 0; i < NR_PORTS; i++) { |
| 2523 | /* Which line caused the data irq? */ |
| 2524 | if (irq_mask1_rd & data_mask) { |
| 2525 | handled = 1; |
| 2526 | handle_ser_rx_interrupt(info); |
| 2527 | } |
| 2528 | info += 1; |
| 2529 | data_mask <<= 2; |
| 2530 | } |
| 2531 | /* Handle tx interrupts with interrupts enabled so we |
| 2532 | * can take care of new data interrupts while transmitting |
| 2533 | * We protect the tx part with the tx_started flag. |
| 2534 | * We disable the tr_ready interrupts we are about to handle and |
| 2535 | * unblock the serial interrupt so new serial interrupts may come. |
| 2536 | * |
| 2537 | * If we get a new interrupt: |
| 2538 | * - it migth be due to synchronous serial ports. |
| 2539 | * - serial irq will be blocked by general irq handler. |
| 2540 | * - async data will be handled above (sync will be ignored). |
| 2541 | * - tx_started flag will prevent us from trying to send again and |
| 2542 | * we will exit fast - no need to unblock serial irq. |
| 2543 | * - Next (sync) serial interrupt handler will be runned with |
| 2544 | * disabled interrupt due to restore_flags() at end of function, |
| 2545 | * so sync handler will not be preempted or reentered. |
| 2546 | */ |
| 2547 | if (!tx_started) { |
| 2548 | unsigned long ready_mask; |
| 2549 | unsigned long |
| 2550 | tx_started = 1; |
| 2551 | /* Only the tr_ready interrupts left */ |
| 2552 | irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
| 2553 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
| 2554 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
| 2555 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); |
| 2556 | while (irq_mask1_rd) { |
| 2557 | /* Disable those we are about to handle */ |
| 2558 | *R_IRQ_MASK1_CLR = irq_mask1_rd; |
| 2559 | /* Unblock the serial interrupt */ |
| 2560 | *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set); |
| 2561 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2562 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */ |
| 2564 | info = rs_table; |
| 2565 | for (i = 0; i < NR_PORTS; i++) { |
| 2566 | /* Which line caused the ready irq? */ |
| 2567 | if (irq_mask1_rd & ready_mask) { |
| 2568 | handled = 1; |
| 2569 | handle_ser_tx_interrupt(info); |
| 2570 | } |
| 2571 | info += 1; |
| 2572 | ready_mask <<= 2; |
| 2573 | } |
| 2574 | /* handle_ser_tx_interrupt enables tr_ready interrupts */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2575 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | /* Handle reentered TX interrupt */ |
| 2577 | irq_mask1_rd = reentered_ready_mask; |
| 2578 | } |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2579 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | tx_started = 0; |
| 2581 | } else { |
| 2582 | unsigned long ready_mask; |
| 2583 | ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
| 2584 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
| 2585 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
| 2586 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); |
| 2587 | if (ready_mask) { |
| 2588 | reentered_ready_mask |= ready_mask; |
| 2589 | /* Disable those we are about to handle */ |
| 2590 | *R_IRQ_MASK1_CLR = ready_mask; |
| 2591 | DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask)); |
| 2592 | } |
| 2593 | } |
| 2594 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2595 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | return IRQ_RETVAL(handled); |
| 2597 | } /* ser_interrupt */ |
| 2598 | #endif |
| 2599 | |
| 2600 | /* |
| 2601 | * ------------------------------------------------------------------- |
| 2602 | * Here ends the serial interrupt routines. |
| 2603 | * ------------------------------------------------------------------- |
| 2604 | */ |
| 2605 | |
| 2606 | /* |
| 2607 | * This routine is used to handle the "bottom half" processing for the |
| 2608 | * serial driver, known also the "software interrupt" processing. |
| 2609 | * This processing is done at the kernel interrupt level, after the |
| 2610 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This |
| 2611 | * is where time-consuming activities which can not be done in the |
| 2612 | * interrupt driver proper are done; the interrupt driver schedules |
| 2613 | * them using rs_sched_event(), and they get done here. |
| 2614 | */ |
| 2615 | static void |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2616 | do_softint(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2618 | struct e100_serial *info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2619 | struct tty_struct *tty; |
| 2620 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2621 | info = container_of(work, struct e100_serial, work); |
| 2622 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2623 | tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | if (!tty) |
| 2625 | return; |
| 2626 | |
Jiri Slaby | b963a84 | 2007-02-10 01:44:55 -0800 | [diff] [blame] | 2627 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) |
| 2628 | tty_wakeup(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | } |
| 2630 | |
| 2631 | static int |
| 2632 | startup(struct e100_serial * info) |
| 2633 | { |
| 2634 | unsigned long flags; |
| 2635 | unsigned long xmit_page; |
| 2636 | int i; |
| 2637 | |
| 2638 | xmit_page = get_zeroed_page(GFP_KERNEL); |
| 2639 | if (!xmit_page) |
| 2640 | return -ENOMEM; |
| 2641 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2642 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | |
| 2644 | /* if it was already initialized, skip this */ |
| 2645 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2646 | if (info->port.flags & ASYNC_INITIALIZED) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2647 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2648 | free_page(xmit_page); |
| 2649 | return 0; |
| 2650 | } |
| 2651 | |
| 2652 | if (info->xmit.buf) |
| 2653 | free_page(xmit_page); |
| 2654 | else |
| 2655 | info->xmit.buf = (unsigned char *) xmit_page; |
| 2656 | |
| 2657 | #ifdef SERIAL_DEBUG_OPEN |
| 2658 | printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf); |
| 2659 | #endif |
| 2660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2661 | /* |
| 2662 | * Clear the FIFO buffers and disable them |
| 2663 | * (they will be reenabled in change_speed()) |
| 2664 | */ |
| 2665 | |
| 2666 | /* |
| 2667 | * Reset the DMA channels and make sure their interrupts are cleared |
| 2668 | */ |
| 2669 | |
| 2670 | if (info->dma_in_enabled) { |
| 2671 | info->uses_dma_in = 1; |
| 2672 | e100_enable_rxdma_channel(info); |
| 2673 | |
| 2674 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2675 | |
| 2676 | /* Wait until reset cycle is complete */ |
| 2677 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == |
| 2678 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 2679 | |
| 2680 | /* Make sure the irqs are cleared */ |
| 2681 | *info->iclrintradr = |
| 2682 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 2683 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 2684 | } else { |
| 2685 | e100_disable_rxdma_channel(info); |
| 2686 | } |
| 2687 | |
| 2688 | if (info->dma_out_enabled) { |
| 2689 | info->uses_dma_out = 1; |
| 2690 | e100_enable_txdma_channel(info); |
| 2691 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2692 | |
| 2693 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) == |
| 2694 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 2695 | |
| 2696 | /* Make sure the irqs are cleared */ |
| 2697 | *info->oclrintradr = |
| 2698 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 2699 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 2700 | } else { |
| 2701 | e100_disable_txdma_channel(info); |
| 2702 | } |
| 2703 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2704 | if (info->port.tty) |
| 2705 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | |
| 2707 | info->xmit.head = info->xmit.tail = 0; |
| 2708 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 2709 | info->recv_cnt = info->max_recv_cnt = 0; |
| 2710 | |
| 2711 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 2712 | info->rec_descr[i].buf = 0; |
| 2713 | |
| 2714 | /* |
| 2715 | * and set the speed and other flags of the serial port |
| 2716 | * this will start the rx/tx as well |
| 2717 | */ |
| 2718 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 2719 | e100_enable_serial_data_irq(info); |
| 2720 | #endif |
| 2721 | change_speed(info); |
| 2722 | |
| 2723 | /* dummy read to reset any serial errors */ |
| 2724 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2725 | (void)info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | |
| 2727 | /* enable the interrupts */ |
| 2728 | if (info->uses_dma_out) |
| 2729 | e100_enable_txdma_irq(info); |
| 2730 | |
| 2731 | e100_enable_rx_irq(info); |
| 2732 | |
| 2733 | info->tr_running = 0; /* to be sure we don't lock up the transmitter */ |
| 2734 | |
| 2735 | /* setup the dma input descriptor and start dma */ |
| 2736 | |
| 2737 | start_receive(info); |
| 2738 | |
| 2739 | /* for safety, make sure the descriptors last result is 0 bytes written */ |
| 2740 | |
| 2741 | info->tr_descr.sw_len = 0; |
| 2742 | info->tr_descr.hw_len = 0; |
| 2743 | info->tr_descr.status = 0; |
| 2744 | |
| 2745 | /* enable RTS/DTR last */ |
| 2746 | |
| 2747 | e100_rts(info, 1); |
| 2748 | e100_dtr(info, 1); |
| 2749 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2750 | info->port.flags |= ASYNC_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2752 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | return 0; |
| 2754 | } |
| 2755 | |
| 2756 | /* |
| 2757 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 2758 | * DTR is dropped if the hangup on close termio flag is on. |
| 2759 | */ |
| 2760 | static void |
| 2761 | shutdown(struct e100_serial * info) |
| 2762 | { |
| 2763 | unsigned long flags; |
| 2764 | struct etrax_dma_descr *descr = info->rec_descr; |
| 2765 | struct etrax_recv_buffer *buffer; |
| 2766 | int i; |
| 2767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2768 | /* shut down the transmitter and receiver */ |
| 2769 | DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line)); |
| 2770 | e100_disable_rx(info); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2771 | info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2772 | |
| 2773 | /* disable interrupts, reset dma channels */ |
| 2774 | if (info->uses_dma_in) { |
| 2775 | e100_disable_rxdma_irq(info); |
| 2776 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2777 | info->uses_dma_in = 0; |
| 2778 | } else { |
| 2779 | e100_disable_serial_data_irq(info); |
| 2780 | } |
| 2781 | |
| 2782 | if (info->uses_dma_out) { |
| 2783 | e100_disable_txdma_irq(info); |
| 2784 | info->tr_running = 0; |
| 2785 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2786 | info->uses_dma_out = 0; |
| 2787 | } else { |
| 2788 | e100_disable_serial_tx_ready_irq(info); |
| 2789 | info->tr_running = 0; |
| 2790 | } |
| 2791 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2792 | if (!(info->port.flags & ASYNC_INITIALIZED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | return; |
| 2794 | |
| 2795 | #ifdef SERIAL_DEBUG_OPEN |
| 2796 | printk("Shutting down serial port %d (irq %d)....\n", info->line, |
| 2797 | info->irq); |
| 2798 | #endif |
| 2799 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2800 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | |
| 2802 | if (info->xmit.buf) { |
| 2803 | free_page((unsigned long)info->xmit.buf); |
| 2804 | info->xmit.buf = NULL; |
| 2805 | } |
| 2806 | |
| 2807 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 2808 | if (descr[i].buf) { |
| 2809 | buffer = phys_to_virt(descr[i].buf) - sizeof *buffer; |
| 2810 | kfree(buffer); |
| 2811 | descr[i].buf = 0; |
| 2812 | } |
| 2813 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2814 | if (!info->port.tty || (info->port.tty->termios.c_cflag & HUPCL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | /* hang up DTR and RTS if HUPCL is enabled */ |
| 2816 | e100_dtr(info, 0); |
| 2817 | e100_rts(info, 0); /* could check CRTSCTS before doing this */ |
| 2818 | } |
| 2819 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2820 | if (info->port.tty) |
| 2821 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2822 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2823 | info->port.flags &= ~ASYNC_INITIALIZED; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2824 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2825 | } |
| 2826 | |
| 2827 | |
| 2828 | /* change baud rate and other assorted parameters */ |
| 2829 | |
| 2830 | static void |
| 2831 | change_speed(struct e100_serial *info) |
| 2832 | { |
| 2833 | unsigned int cflag; |
| 2834 | unsigned long xoff; |
| 2835 | unsigned long flags; |
| 2836 | /* first some safety checks */ |
| 2837 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2838 | if (!info->port.tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2839 | return; |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2840 | if (!info->ioport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2841 | return; |
| 2842 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2843 | cflag = info->port.tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2844 | |
| 2845 | /* possibly, the tx/rx should be disabled first to do this safely */ |
| 2846 | |
| 2847 | /* change baud-rate and write it to the hardware */ |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2848 | if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2849 | /* Special baudrate */ |
| 2850 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ |
| 2851 | unsigned long alt_source = |
| 2852 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | |
| 2853 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); |
| 2854 | /* R_ALT_SER_BAUDRATE selects the source */ |
| 2855 | DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n", |
| 2856 | (unsigned long)info->baud_base, info->custom_divisor)); |
| 2857 | if (info->baud_base == SERIAL_PRESCALE_BASE) { |
| 2858 | /* 0, 2-65535 (0=65536) */ |
| 2859 | u16 divisor = info->custom_divisor; |
| 2860 | /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */ |
| 2861 | /* baudrate is 3.125MHz/custom_divisor */ |
| 2862 | alt_source = |
| 2863 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) | |
| 2864 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale); |
| 2865 | alt_source = 0x11; |
| 2866 | DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor)); |
| 2867 | *R_SERIAL_PRESCALE = divisor; |
| 2868 | info->baud = SERIAL_PRESCALE_BASE/divisor; |
| 2869 | } |
| 2870 | #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED |
| 2871 | else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 && |
| 2872 | info->custom_divisor == 1) || |
| 2873 | (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ && |
| 2874 | info->custom_divisor == 8)) { |
| 2875 | /* ext_clk selected */ |
| 2876 | alt_source = |
| 2877 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) | |
| 2878 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern); |
| 2879 | DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8)); |
| 2880 | info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8; |
| 2881 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | #endif |
| 2883 | else |
| 2884 | { |
| 2885 | /* Bad baudbase, we don't support using timer0 |
| 2886 | * for baudrate. |
| 2887 | */ |
| 2888 | printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n", |
| 2889 | (unsigned long)info->baud_base, info->custom_divisor); |
| 2890 | } |
| 2891 | r_alt_ser_baudrate_shadow &= ~mask; |
| 2892 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); |
| 2893 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; |
| 2894 | } else { |
| 2895 | /* Normal baudrate */ |
| 2896 | /* Make sure we use normal baudrate */ |
| 2897 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ |
| 2898 | unsigned long alt_source = |
| 2899 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | |
| 2900 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); |
| 2901 | r_alt_ser_baudrate_shadow &= ~mask; |
| 2902 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | |
| 2905 | info->baud = cflag_to_baud(cflag); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2906 | info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2907 | } |
| 2908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2909 | /* start with default settings and then fill in changes */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2910 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2911 | /* 8 bit, no/even parity */ |
| 2912 | info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) | |
| 2913 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) | |
| 2914 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par)); |
| 2915 | |
| 2916 | /* 8 bit, no/even parity, 1 stop bit, no cts */ |
| 2917 | info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) | |
| 2918 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) | |
| 2919 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par) | |
| 2920 | IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) | |
| 2921 | IO_MASK(R_SERIAL0_TR_CTRL, auto_cts)); |
| 2922 | |
| 2923 | if ((cflag & CSIZE) == CS7) { |
| 2924 | /* set 7 bit mode */ |
| 2925 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit); |
| 2926 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit); |
| 2927 | } |
| 2928 | |
| 2929 | if (cflag & CSTOPB) { |
| 2930 | /* set 2 stop bit mode */ |
| 2931 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits); |
| 2932 | } |
| 2933 | |
| 2934 | if (cflag & PARENB) { |
| 2935 | /* enable parity */ |
| 2936 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable); |
| 2937 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable); |
| 2938 | } |
| 2939 | |
| 2940 | if (cflag & CMSPAR) { |
| 2941 | /* enable stick parity, PARODD mean Mark which matches ETRAX */ |
| 2942 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick); |
| 2943 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick); |
| 2944 | } |
| 2945 | if (cflag & PARODD) { |
| 2946 | /* set odd parity (or Mark if CMSPAR) */ |
| 2947 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd); |
| 2948 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd); |
| 2949 | } |
| 2950 | |
| 2951 | if (cflag & CRTSCTS) { |
| 2952 | /* enable automatic CTS handling */ |
| 2953 | DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0)); |
| 2954 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active); |
| 2955 | } |
| 2956 | |
| 2957 | /* make sure the tx and rx are enabled */ |
| 2958 | |
| 2959 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable); |
| 2960 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable); |
| 2961 | |
| 2962 | /* actually write the control regs to the hardware */ |
| 2963 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2964 | info->ioport[REG_TR_CTRL] = info->tx_ctrl; |
| 2965 | info->ioport[REG_REC_CTRL] = info->rx_ctrl; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2966 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->port.tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2967 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2968 | if (info->port.tty->termios.c_iflag & IXON ) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2969 | DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", |
| 2970 | STOP_CHAR(info->port.tty))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2971 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 2972 | } |
| 2973 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2974 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2975 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2976 | |
| 2977 | update_char_time(info); |
| 2978 | |
| 2979 | } /* change_speed */ |
| 2980 | |
| 2981 | /* start transmitting chars NOW */ |
| 2982 | |
| 2983 | static void |
| 2984 | rs_flush_chars(struct tty_struct *tty) |
| 2985 | { |
| 2986 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 2987 | unsigned long flags; |
| 2988 | |
| 2989 | if (info->tr_running || |
| 2990 | info->xmit.head == info->xmit.tail || |
| 2991 | tty->stopped || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2992 | !info->xmit.buf) |
| 2993 | return; |
| 2994 | |
| 2995 | #ifdef SERIAL_DEBUG_FLOW |
| 2996 | printk("rs_flush_chars\n"); |
| 2997 | #endif |
| 2998 | |
| 2999 | /* this protection might not exactly be necessary here */ |
| 3000 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3001 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3002 | start_transmit(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3003 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3004 | } |
| 3005 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3006 | static int rs_raw_write(struct tty_struct *tty, |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 3007 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | { |
| 3009 | int c, ret = 0; |
| 3010 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3011 | unsigned long flags; |
| 3012 | |
| 3013 | /* first some sanity checks */ |
| 3014 | |
Cong Ding | f938f37 | 2013-01-16 23:30:44 +0100 | [diff] [blame] | 3015 | if (!info->xmit.buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3016 | return 0; |
| 3017 | |
| 3018 | #ifdef SERIAL_DEBUG_DATA |
| 3019 | if (info->line == SERIAL_DEBUG_LINE) |
| 3020 | printk("rs_raw_write (%d), status %d\n", |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3021 | count, info->ioport[REG_STATUS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3022 | #endif |
| 3023 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3024 | local_save_flags(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | DFLOW(DEBUG_LOG(info->line, "write count %i ", count)); |
| 3026 | DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty))); |
| 3027 | |
| 3028 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3029 | /* The local_irq_disable/restore_flags pairs below are needed |
| 3030 | * because the DMA interrupt handler moves the info->xmit values. |
| 3031 | * the memcpy needs to be in the critical region unfortunately, |
| 3032 | * because we need to read xmit values, memcpy, write xmit values |
| 3033 | * in one atomic operation... this could perhaps be avoided by |
| 3034 | * more clever design. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3036 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3037 | while (count) { |
| 3038 | c = CIRC_SPACE_TO_END(info->xmit.head, |
| 3039 | info->xmit.tail, |
| 3040 | SERIAL_XMIT_SIZE); |
| 3041 | |
| 3042 | if (count < c) |
| 3043 | c = count; |
| 3044 | if (c <= 0) |
| 3045 | break; |
| 3046 | |
| 3047 | memcpy(info->xmit.buf + info->xmit.head, buf, c); |
| 3048 | info->xmit.head = (info->xmit.head + c) & |
| 3049 | (SERIAL_XMIT_SIZE-1); |
| 3050 | buf += c; |
| 3051 | count -= c; |
| 3052 | ret += c; |
| 3053 | } |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3054 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | |
| 3056 | /* enable transmitter if not running, unless the tty is stopped |
| 3057 | * this does not need IRQ protection since if tr_running == 0 |
| 3058 | * the IRQ's are not running anyway for this port. |
| 3059 | */ |
| 3060 | DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret)); |
| 3061 | |
| 3062 | if (info->xmit.head != info->xmit.tail && |
| 3063 | !tty->stopped && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3064 | !info->tr_running) { |
| 3065 | start_transmit(info); |
| 3066 | } |
| 3067 | |
| 3068 | return ret; |
| 3069 | } /* raw_raw_write() */ |
| 3070 | |
| 3071 | static int |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3072 | rs_write(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3073 | const unsigned char *buf, int count) |
| 3074 | { |
| 3075 | #if defined(CONFIG_ETRAX_RS485) |
| 3076 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3077 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3078 | if (info->rs485.flags & SER_RS485_ENABLED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | { |
| 3080 | /* If we are in RS-485 mode, we need to toggle RTS and disable |
| 3081 | * the receiver before initiating a DMA transfer |
| 3082 | */ |
| 3083 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 3084 | /* Abort any started timer */ |
| 3085 | fast_timers_rs485[info->line].function = NULL; |
| 3086 | del_fast_timer(&fast_timers_rs485[info->line]); |
| 3087 | #endif |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3088 | e100_rts(info, (info->rs485.flags & SER_RS485_RTS_ON_SEND)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3089 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 3090 | e100_disable_rx(info); |
| 3091 | e100_enable_rx_irq(info); |
| 3092 | #endif |
Claudio Scordino | 93f3350 | 2011-11-09 15:51:49 +0100 | [diff] [blame] | 3093 | if (info->rs485.delay_rts_before_send > 0) |
| 3094 | msleep(info->rs485.delay_rts_before_send); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3095 | } |
| 3096 | #endif /* CONFIG_ETRAX_RS485 */ |
| 3097 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3098 | count = rs_raw_write(tty, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3099 | |
| 3100 | #if defined(CONFIG_ETRAX_RS485) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3101 | if (info->rs485.flags & SER_RS485_ENABLED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3102 | { |
| 3103 | unsigned int val; |
| 3104 | /* If we are in RS-485 mode the following has to be done: |
| 3105 | * wait until DMA is ready |
| 3106 | * wait on transmit shift register |
| 3107 | * toggle RTS |
| 3108 | * enable the receiver |
| 3109 | */ |
| 3110 | |
| 3111 | /* Sleep until all sent */ |
| 3112 | tty_wait_until_sent(tty, 0); |
| 3113 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 3114 | /* Now sleep a little more so that shift register is empty */ |
| 3115 | schedule_usleep(info->char_time_usec * 2); |
| 3116 | #endif |
| 3117 | /* wait on transmit shift register */ |
| 3118 | do{ |
| 3119 | get_lsr_info(info, &val); |
| 3120 | }while (!(val & TIOCSER_TEMT)); |
| 3121 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3122 | e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3123 | |
| 3124 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 3125 | e100_enable_rx(info); |
| 3126 | e100_enable_rxdma_irq(info); |
| 3127 | #endif |
| 3128 | } |
| 3129 | #endif /* CONFIG_ETRAX_RS485 */ |
| 3130 | |
| 3131 | return count; |
| 3132 | } /* rs_write */ |
| 3133 | |
| 3134 | |
| 3135 | /* how much space is available in the xmit buffer? */ |
| 3136 | |
| 3137 | static int |
| 3138 | rs_write_room(struct tty_struct *tty) |
| 3139 | { |
| 3140 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3141 | |
| 3142 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 3143 | } |
| 3144 | |
| 3145 | /* How many chars are in the xmit buffer? |
| 3146 | * This does not include any chars in the transmitter FIFO. |
| 3147 | * Use wait_until_sent for waiting for FIFO drain. |
| 3148 | */ |
| 3149 | |
| 3150 | static int |
| 3151 | rs_chars_in_buffer(struct tty_struct *tty) |
| 3152 | { |
| 3153 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3154 | |
| 3155 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 3156 | } |
| 3157 | |
| 3158 | /* discard everything in the xmit buffer */ |
| 3159 | |
| 3160 | static void |
| 3161 | rs_flush_buffer(struct tty_struct *tty) |
| 3162 | { |
| 3163 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3164 | unsigned long flags; |
| 3165 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3166 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3167 | info->xmit.head = info->xmit.tail = 0; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3168 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3169 | |
Jiri Slaby | b963a84 | 2007-02-10 01:44:55 -0800 | [diff] [blame] | 3170 | tty_wakeup(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3171 | } |
| 3172 | |
| 3173 | /* |
| 3174 | * This function is used to send a high-priority XON/XOFF character to |
| 3175 | * the device |
| 3176 | * |
| 3177 | * Since we use DMA we don't check for info->x_char in transmit_chars_dma(), |
| 3178 | * but we do it in handle_ser_tx_interrupt(). |
| 3179 | * We disable DMA channel and enable tx ready interrupt and write the |
| 3180 | * character when possible. |
| 3181 | */ |
| 3182 | static void rs_send_xchar(struct tty_struct *tty, char ch) |
| 3183 | { |
| 3184 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3185 | unsigned long flags; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3186 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3187 | if (info->uses_dma_out) { |
| 3188 | /* Put the DMA on hold and disable the channel */ |
| 3189 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold); |
| 3190 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) != |
| 3191 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold)); |
| 3192 | e100_disable_txdma_channel(info); |
| 3193 | } |
| 3194 | |
| 3195 | /* Must make sure transmitter is not stopped before we can transmit */ |
| 3196 | if (tty->stopped) |
| 3197 | rs_start(tty); |
| 3198 | |
| 3199 | /* Enable manual transmit interrupt and send from there */ |
| 3200 | DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch)); |
| 3201 | info->x_char = ch; |
| 3202 | e100_enable_serial_tx_ready_irq(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3203 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3204 | } |
| 3205 | |
| 3206 | /* |
| 3207 | * ------------------------------------------------------------ |
| 3208 | * rs_throttle() |
| 3209 | * |
| 3210 | * This routine is called by the upper-layer tty layer to signal that |
| 3211 | * incoming characters should be throttled. |
| 3212 | * ------------------------------------------------------------ |
| 3213 | */ |
| 3214 | static void |
| 3215 | rs_throttle(struct tty_struct * tty) |
| 3216 | { |
| 3217 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3218 | #ifdef SERIAL_DEBUG_THROTTLE |
Rasmus Villemoes | 429b474 | 2015-03-31 15:55:59 +0200 | [diff] [blame^] | 3219 | printk("throttle %s: %lu....\n", tty_name(tty), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3220 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); |
| 3221 | #endif |
| 3222 | DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty))); |
| 3223 | |
| 3224 | /* Do RTS before XOFF since XOFF might take some time */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 3225 | if (tty->termios.c_cflag & CRTSCTS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3226 | /* Turn off RTS line */ |
| 3227 | e100_rts(info, 0); |
| 3228 | } |
| 3229 | if (I_IXOFF(tty)) |
| 3230 | rs_send_xchar(tty, STOP_CHAR(tty)); |
| 3231 | |
| 3232 | } |
| 3233 | |
| 3234 | static void |
| 3235 | rs_unthrottle(struct tty_struct * tty) |
| 3236 | { |
| 3237 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3238 | #ifdef SERIAL_DEBUG_THROTTLE |
Rasmus Villemoes | 429b474 | 2015-03-31 15:55:59 +0200 | [diff] [blame^] | 3239 | printk("unthrottle %s: %lu....\n", tty_name(tty), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3240 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); |
| 3241 | #endif |
| 3242 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty))); |
| 3243 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count)); |
| 3244 | /* Do RTS before XOFF since XOFF might take some time */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 3245 | if (tty->termios.c_cflag & CRTSCTS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3246 | /* Assert RTS line */ |
| 3247 | e100_rts(info, 1); |
| 3248 | } |
| 3249 | |
| 3250 | if (I_IXOFF(tty)) { |
| 3251 | if (info->x_char) |
| 3252 | info->x_char = 0; |
| 3253 | else |
| 3254 | rs_send_xchar(tty, START_CHAR(tty)); |
| 3255 | } |
| 3256 | |
| 3257 | } |
| 3258 | |
| 3259 | /* |
| 3260 | * ------------------------------------------------------------ |
| 3261 | * rs_ioctl() and friends |
| 3262 | * ------------------------------------------------------------ |
| 3263 | */ |
| 3264 | |
| 3265 | static int |
| 3266 | get_serial_info(struct e100_serial * info, |
| 3267 | struct serial_struct * retinfo) |
| 3268 | { |
| 3269 | struct serial_struct tmp; |
| 3270 | |
| 3271 | /* this is all probably wrong, there are a lot of fields |
| 3272 | * here that we don't have in e100_serial and maybe we |
| 3273 | * should set them to something else than 0. |
| 3274 | */ |
| 3275 | |
| 3276 | if (!retinfo) |
| 3277 | return -EFAULT; |
| 3278 | memset(&tmp, 0, sizeof(tmp)); |
| 3279 | tmp.type = info->type; |
| 3280 | tmp.line = info->line; |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3281 | tmp.port = (int)info->ioport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3282 | tmp.irq = info->irq; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3283 | tmp.flags = info->port.flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3284 | tmp.baud_base = info->baud_base; |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3285 | tmp.close_delay = info->port.close_delay; |
| 3286 | tmp.closing_wait = info->port.closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3287 | tmp.custom_divisor = info->custom_divisor; |
| 3288 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 3289 | return -EFAULT; |
| 3290 | return 0; |
| 3291 | } |
| 3292 | |
| 3293 | static int |
| 3294 | set_serial_info(struct e100_serial *info, |
| 3295 | struct serial_struct *new_info) |
| 3296 | { |
| 3297 | struct serial_struct new_serial; |
| 3298 | struct e100_serial old_info; |
| 3299 | int retval = 0; |
| 3300 | |
| 3301 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
| 3302 | return -EFAULT; |
| 3303 | |
| 3304 | old_info = *info; |
| 3305 | |
| 3306 | if (!capable(CAP_SYS_ADMIN)) { |
| 3307 | if ((new_serial.type != info->type) || |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3308 | (new_serial.close_delay != info->port.close_delay) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3309 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3310 | (info->port.flags & ~ASYNC_USR_MASK))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3311 | return -EPERM; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3312 | info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3313 | (new_serial.flags & ASYNC_USR_MASK)); |
| 3314 | goto check_and_exit; |
| 3315 | } |
| 3316 | |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3317 | if (info->port.count > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3318 | return -EBUSY; |
| 3319 | |
| 3320 | /* |
| 3321 | * OK, past this point, all the error checking has been done. |
| 3322 | * At this point, we start making changes..... |
| 3323 | */ |
| 3324 | |
| 3325 | info->baud_base = new_serial.baud_base; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3326 | info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3327 | (new_serial.flags & ASYNC_FLAGS)); |
| 3328 | info->custom_divisor = new_serial.custom_divisor; |
| 3329 | info->type = new_serial.type; |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3330 | info->port.close_delay = new_serial.close_delay; |
| 3331 | info->port.closing_wait = new_serial.closing_wait; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3332 | info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3333 | |
| 3334 | check_and_exit: |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3335 | if (info->port.flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3336 | change_speed(info); |
| 3337 | } else |
| 3338 | retval = startup(info); |
| 3339 | return retval; |
| 3340 | } |
| 3341 | |
| 3342 | /* |
| 3343 | * get_lsr_info - get line status register info |
| 3344 | * |
| 3345 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 3346 | * is emptied. On bus types like RS485, the transmitter must |
| 3347 | * release the bus after transmitting. This must be done when |
| 3348 | * the transmit shift register is empty, not be done when the |
| 3349 | * transmit holding register is empty. This functionality |
| 3350 | * allows an RS485 driver to be written in user space. |
| 3351 | */ |
| 3352 | static int |
| 3353 | get_lsr_info(struct e100_serial * info, unsigned int *value) |
| 3354 | { |
| 3355 | unsigned int result = TIOCSER_TEMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3356 | unsigned long curr_time = jiffies; |
| 3357 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); |
| 3358 | unsigned long elapsed_usec = |
| 3359 | (curr_time - info->last_tx_active) * 1000000/HZ + |
| 3360 | curr_time_usec - info->last_tx_active_usec; |
| 3361 | |
| 3362 | if (info->xmit.head != info->xmit.tail || |
| 3363 | elapsed_usec < 2*info->char_time_usec) { |
| 3364 | result = 0; |
| 3365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3366 | |
| 3367 | if (copy_to_user(value, &result, sizeof(int))) |
| 3368 | return -EFAULT; |
| 3369 | return 0; |
| 3370 | } |
| 3371 | |
| 3372 | #ifdef SERIAL_DEBUG_IO |
| 3373 | struct state_str |
| 3374 | { |
| 3375 | int state; |
| 3376 | const char *str; |
| 3377 | }; |
| 3378 | |
| 3379 | const struct state_str control_state_str[] = { |
| 3380 | {TIOCM_DTR, "DTR" }, |
| 3381 | {TIOCM_RTS, "RTS"}, |
| 3382 | {TIOCM_ST, "ST?" }, |
| 3383 | {TIOCM_SR, "SR?" }, |
| 3384 | {TIOCM_CTS, "CTS" }, |
| 3385 | {TIOCM_CD, "CD" }, |
| 3386 | {TIOCM_RI, "RI" }, |
| 3387 | {TIOCM_DSR, "DSR" }, |
| 3388 | {0, NULL } |
| 3389 | }; |
| 3390 | |
| 3391 | char *get_control_state_str(int MLines, char *s) |
| 3392 | { |
| 3393 | int i = 0; |
| 3394 | |
| 3395 | s[0]='\0'; |
| 3396 | while (control_state_str[i].str != NULL) { |
| 3397 | if (MLines & control_state_str[i].state) { |
| 3398 | if (s[0] != '\0') { |
| 3399 | strcat(s, ", "); |
| 3400 | } |
| 3401 | strcat(s, control_state_str[i].str); |
| 3402 | } |
| 3403 | i++; |
| 3404 | } |
| 3405 | return s; |
| 3406 | } |
| 3407 | #endif |
| 3408 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3409 | static int |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3410 | rs_break(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3411 | { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3412 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3413 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3414 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3415 | if (!info->ioport) |
| 3416 | return -EIO; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3417 | |
| 3418 | local_irq_save(flags); |
| 3419 | if (break_state == -1) { |
| 3420 | /* Go to manual mode and set the txd pin to 0 */ |
| 3421 | /* Clear bit 7 (txd) and 6 (tr_enable) */ |
| 3422 | info->tx_ctrl &= 0x3F; |
| 3423 | } else { |
| 3424 | /* Set bit 7 (txd) and 6 (tr_enable) */ |
| 3425 | info->tx_ctrl |= (0x80 | 0x40); |
| 3426 | } |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3427 | info->ioport[REG_TR_CTRL] = info->tx_ctrl; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3428 | local_irq_restore(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3429 | return 0; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3430 | } |
| 3431 | |
| 3432 | static int |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 3433 | rs_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3434 | { |
| 3435 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3436 | unsigned long flags; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3437 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3438 | local_irq_save(flags); |
Alan Cox | 032c17e | 2008-04-28 02:13:50 -0700 | [diff] [blame] | 3439 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3440 | if (clear & TIOCM_RTS) |
| 3441 | e100_rts(info, 0); |
| 3442 | if (clear & TIOCM_DTR) |
| 3443 | e100_dtr(info, 0); |
| 3444 | /* Handle FEMALE behaviour */ |
| 3445 | if (clear & TIOCM_RI) |
| 3446 | e100_ri_out(info, 0); |
| 3447 | if (clear & TIOCM_CD) |
| 3448 | e100_cd_out(info, 0); |
| 3449 | |
| 3450 | if (set & TIOCM_RTS) |
| 3451 | e100_rts(info, 1); |
| 3452 | if (set & TIOCM_DTR) |
| 3453 | e100_dtr(info, 1); |
| 3454 | /* Handle FEMALE behaviour */ |
| 3455 | if (set & TIOCM_RI) |
| 3456 | e100_ri_out(info, 1); |
| 3457 | if (set & TIOCM_CD) |
| 3458 | e100_cd_out(info, 1); |
Alan Cox | 032c17e | 2008-04-28 02:13:50 -0700 | [diff] [blame] | 3459 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3460 | local_irq_restore(flags); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3461 | return 0; |
| 3462 | } |
| 3463 | |
| 3464 | static int |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 3465 | rs_tiocmget(struct tty_struct *tty) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3466 | { |
| 3467 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3468 | unsigned int result; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3469 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3470 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3471 | local_irq_save(flags); |
| 3472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3473 | result = |
| 3474 | (!E100_RTS_GET(info) ? TIOCM_RTS : 0) |
| 3475 | | (!E100_DTR_GET(info) ? TIOCM_DTR : 0) |
| 3476 | | (!E100_RI_GET(info) ? TIOCM_RNG : 0) |
| 3477 | | (!E100_DSR_GET(info) ? TIOCM_DSR : 0) |
| 3478 | | (!E100_CD_GET(info) ? TIOCM_CAR : 0) |
| 3479 | | (!E100_CTS_GET(info) ? TIOCM_CTS : 0); |
| 3480 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3481 | local_irq_restore(flags); |
Alan Cox | 032c17e | 2008-04-28 02:13:50 -0700 | [diff] [blame] | 3482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3483 | #ifdef SERIAL_DEBUG_IO |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3484 | printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n", |
| 3485 | info->line, result, result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3486 | { |
| 3487 | char s[100]; |
| 3488 | |
| 3489 | get_control_state_str(result, s); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3490 | printk(KERN_DEBUG "state: %s\n", s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3491 | } |
| 3492 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3493 | return result; |
| 3494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3495 | } |
| 3496 | |
| 3497 | |
| 3498 | static int |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 3499 | rs_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3500 | unsigned int cmd, unsigned long arg) |
| 3501 | { |
| 3502 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 3503 | |
| 3504 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 3505 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && |
| 3506 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { |
| 3507 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 3508 | return -EIO; |
| 3509 | } |
| 3510 | |
| 3511 | switch (cmd) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3512 | case TIOCGSERIAL: |
| 3513 | return get_serial_info(info, |
| 3514 | (struct serial_struct *) arg); |
| 3515 | case TIOCSSERIAL: |
| 3516 | return set_serial_info(info, |
| 3517 | (struct serial_struct *) arg); |
| 3518 | case TIOCSERGETLSR: /* Get line status register */ |
| 3519 | return get_lsr_info(info, (unsigned int *) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3520 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3521 | case TIOCSERGSTRUCT: |
| 3522 | if (copy_to_user((struct e100_serial *) arg, |
| 3523 | info, sizeof(struct e100_serial))) |
| 3524 | return -EFAULT; |
| 3525 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3526 | |
| 3527 | #if defined(CONFIG_ETRAX_RS485) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3528 | case TIOCSERSETRS485: |
| 3529 | { |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3530 | /* In this ioctl we still use the old structure |
| 3531 | * rs485_control for backward compatibility |
| 3532 | * (if we use serial_rs485, then old user-level code |
| 3533 | * wouldn't work anymore...). |
| 3534 | * The use of this ioctl is deprecated: use TIOCSRS485 |
| 3535 | * instead.*/ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3536 | struct rs485_control rs485ctrl; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3537 | struct serial_rs485 rs485data; |
| 3538 | printk(KERN_DEBUG "The use of this ioctl is deprecated. Use TIOCSRS485 instead\n"); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3539 | if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg, |
| 3540 | sizeof(rs485ctrl))) |
| 3541 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3542 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3543 | rs485data.delay_rts_before_send = rs485ctrl.delay_rts_before_send; |
| 3544 | rs485data.flags = 0; |
Jesper Nilsson | c7213fc | 2010-10-28 12:08:27 +0200 | [diff] [blame] | 3545 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3546 | if (rs485ctrl.enabled) |
| 3547 | rs485data.flags |= SER_RS485_ENABLED; |
| 3548 | else |
| 3549 | rs485data.flags &= ~(SER_RS485_ENABLED); |
| 3550 | |
| 3551 | if (rs485ctrl.rts_on_send) |
| 3552 | rs485data.flags |= SER_RS485_RTS_ON_SEND; |
| 3553 | else |
| 3554 | rs485data.flags &= ~(SER_RS485_RTS_ON_SEND); |
| 3555 | |
| 3556 | if (rs485ctrl.rts_after_sent) |
| 3557 | rs485data.flags |= SER_RS485_RTS_AFTER_SEND; |
| 3558 | else |
| 3559 | rs485data.flags &= ~(SER_RS485_RTS_AFTER_SEND); |
| 3560 | |
| 3561 | return e100_enable_rs485(tty, &rs485data); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3562 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3563 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3564 | case TIOCSRS485: |
| 3565 | { |
| 3566 | /* This is the new version of TIOCSRS485, with new |
| 3567 | * data structure serial_rs485 */ |
| 3568 | struct serial_rs485 rs485data; |
| 3569 | if (copy_from_user(&rs485data, (struct rs485_control *)arg, |
| 3570 | sizeof(rs485data))) |
| 3571 | return -EFAULT; |
| 3572 | |
| 3573 | return e100_enable_rs485(tty, &rs485data); |
| 3574 | } |
| 3575 | |
Claudio Scordino | f1d23ed | 2010-05-31 10:19:09 +0200 | [diff] [blame] | 3576 | case TIOCGRS485: |
| 3577 | { |
| 3578 | struct serial_rs485 *rs485data = |
| 3579 | &(((struct e100_serial *)tty->driver_data)->rs485); |
| 3580 | /* This is the ioctl to get RS485 data from user-space */ |
| 3581 | if (copy_to_user((struct serial_rs485 *) arg, |
| 3582 | rs485data, |
Jesper Nilsson | 94479c0 | 2010-10-28 12:04:55 +0200 | [diff] [blame] | 3583 | sizeof(struct serial_rs485))) |
Claudio Scordino | f1d23ed | 2010-05-31 10:19:09 +0200 | [diff] [blame] | 3584 | return -EFAULT; |
| 3585 | break; |
| 3586 | } |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3587 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3588 | case TIOCSERWRRS485: |
| 3589 | { |
| 3590 | struct rs485_write rs485wr; |
| 3591 | if (copy_from_user(&rs485wr, (struct rs485_write *)arg, |
| 3592 | sizeof(rs485wr))) |
| 3593 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3594 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3595 | return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size); |
| 3596 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3597 | #endif |
| 3598 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3599 | default: |
| 3600 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3601 | } |
| 3602 | return 0; |
| 3603 | } |
| 3604 | |
| 3605 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 3606 | rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3607 | { |
| 3608 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3609 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | change_speed(info); |
| 3611 | |
| 3612 | /* Handle turning off CRTSCTS */ |
| 3613 | if ((old_termios->c_cflag & CRTSCTS) && |
Jiri Slaby | ee79706 | 2013-03-07 13:12:34 +0100 | [diff] [blame] | 3614 | !(tty->termios.c_cflag & CRTSCTS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3615 | rs_start(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3616 | |
| 3617 | } |
| 3618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3619 | /* |
| 3620 | * ------------------------------------------------------------ |
| 3621 | * rs_close() |
| 3622 | * |
| 3623 | * This routine is called when the serial port gets closed. First, we |
| 3624 | * wait for the last remaining data to be sent. Then, we unlink its |
| 3625 | * S structure from the interrupt chain if necessary, and we free |
| 3626 | * that IRQ if nothing is left in the chain. |
| 3627 | * ------------------------------------------------------------ |
| 3628 | */ |
| 3629 | static void |
| 3630 | rs_close(struct tty_struct *tty, struct file * filp) |
| 3631 | { |
| 3632 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 3633 | unsigned long flags; |
| 3634 | |
| 3635 | if (!info) |
| 3636 | return; |
| 3637 | |
| 3638 | /* interrupts are disabled for this entire function */ |
| 3639 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3640 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3641 | |
| 3642 | if (tty_hung_up_p(filp)) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3643 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3644 | return; |
| 3645 | } |
| 3646 | |
| 3647 | #ifdef SERIAL_DEBUG_OPEN |
| 3648 | printk("[%d] rs_close ttyS%d, count = %d\n", current->pid, |
| 3649 | info->line, info->count); |
| 3650 | #endif |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3651 | if ((tty->count == 1) && (info->port.count != 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3652 | /* |
| 3653 | * Uh, oh. tty->count is 1, which means that the tty |
| 3654 | * structure will be freed. Info->count should always |
| 3655 | * be one in these conditions. If it's greater than |
| 3656 | * one, we've got real problems, since it means the |
| 3657 | * serial port won't be shutdown. |
| 3658 | */ |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 3659 | printk(KERN_ERR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3660 | "rs_close: bad serial port count; tty->count is 1, " |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3661 | "info->count is %d\n", info->port.count); |
| 3662 | info->port.count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3663 | } |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3664 | if (--info->port.count < 0) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 3665 | printk(KERN_ERR "rs_close: bad serial port count for ttyS%d: %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3666 | info->line, info->port.count); |
| 3667 | info->port.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3668 | } |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3669 | if (info->port.count) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3670 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3671 | return; |
| 3672 | } |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3673 | info->port.flags |= ASYNC_CLOSING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3674 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3675 | * Now we wait for the transmit buffer to clear; and we notify |
| 3676 | * the line discipline to only process XON/XOFF characters. |
| 3677 | */ |
| 3678 | tty->closing = 1; |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3679 | if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 3680 | tty_wait_until_sent(tty, info->port.closing_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3681 | /* |
| 3682 | * At this point we stop accepting input. To do this, we |
| 3683 | * disable the serial receiver and the DMA receive interrupt. |
| 3684 | */ |
| 3685 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 3686 | e100_disable_serial_data_irq(info); |
| 3687 | #endif |
| 3688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3689 | e100_disable_rx(info); |
| 3690 | e100_disable_rx_irq(info); |
| 3691 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3692 | if (info->port.flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3693 | /* |
| 3694 | * Before we drop DTR, make sure the UART transmitter |
| 3695 | * has completely drained; this is especially |
| 3696 | * important as we have a transmit FIFO! |
| 3697 | */ |
| 3698 | rs_wait_until_sent(tty, HZ); |
| 3699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3700 | |
| 3701 | shutdown(info); |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3702 | rs_flush_buffer(tty); |
Alan Cox | 454aa38 | 2008-05-12 12:31:37 +0100 | [diff] [blame] | 3703 | tty_ldisc_flush(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3704 | tty->closing = 0; |
| 3705 | info->event = 0; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 3706 | info->port.tty = NULL; |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3707 | if (info->port.blocked_open) { |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3708 | if (info->port.close_delay) |
| 3709 | schedule_timeout_interruptible(info->port.close_delay); |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3710 | wake_up_interruptible(&info->port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3711 | } |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3712 | info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3713 | wake_up_interruptible(&info->port.close_wait); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3714 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3715 | |
| 3716 | /* port closed */ |
| 3717 | |
| 3718 | #if defined(CONFIG_ETRAX_RS485) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3719 | if (info->rs485.flags & SER_RS485_ENABLED) { |
| 3720 | info->rs485.flags &= ~(SER_RS485_ENABLED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3721 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 3722 | *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit); |
| 3723 | #endif |
| 3724 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 3725 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 3726 | rs485_port_g_bit, 0); |
| 3727 | #endif |
| 3728 | #if defined(CONFIG_ETRAX_RS485_LTC1387) |
| 3729 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 3730 | CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0); |
| 3731 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 3732 | CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0); |
| 3733 | #endif |
| 3734 | } |
| 3735 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3736 | |
| 3737 | /* |
| 3738 | * Release any allocated DMA irq's. |
| 3739 | */ |
| 3740 | if (info->dma_in_enabled) { |
| 3741 | free_irq(info->dma_in_irq_nbr, info); |
| 3742 | cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); |
| 3743 | info->uses_dma_in = 0; |
| 3744 | #ifdef SERIAL_DEBUG_OPEN |
| 3745 | printk(KERN_DEBUG "DMA irq '%s' freed\n", |
| 3746 | info->dma_in_irq_description); |
| 3747 | #endif |
| 3748 | } |
| 3749 | if (info->dma_out_enabled) { |
| 3750 | free_irq(info->dma_out_irq_nbr, info); |
| 3751 | cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); |
| 3752 | info->uses_dma_out = 0; |
| 3753 | #ifdef SERIAL_DEBUG_OPEN |
| 3754 | printk(KERN_DEBUG "DMA irq '%s' freed\n", |
| 3755 | info->dma_out_irq_description); |
| 3756 | #endif |
| 3757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3758 | } |
| 3759 | |
| 3760 | /* |
| 3761 | * rs_wait_until_sent() --- wait until the transmitter is empty |
| 3762 | */ |
| 3763 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) |
| 3764 | { |
| 3765 | unsigned long orig_jiffies; |
| 3766 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3767 | unsigned long curr_time = jiffies; |
| 3768 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); |
| 3769 | long elapsed_usec = |
| 3770 | (curr_time - info->last_tx_active) * (1000000/HZ) + |
| 3771 | curr_time_usec - info->last_tx_active_usec; |
| 3772 | |
| 3773 | /* |
| 3774 | * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO |
| 3775 | * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k) |
| 3776 | */ |
| 3777 | orig_jiffies = jiffies; |
| 3778 | while (info->xmit.head != info->xmit.tail || /* More in send queue */ |
| 3779 | (*info->ostatusadr & 0x007f) || /* more in FIFO */ |
| 3780 | (elapsed_usec < 2*info->char_time_usec)) { |
Nishanth Aravamudan | 3c76bc5 | 2005-11-07 01:01:21 -0800 | [diff] [blame] | 3781 | schedule_timeout_interruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3782 | if (signal_pending(current)) |
| 3783 | break; |
| 3784 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 3785 | break; |
| 3786 | curr_time = jiffies; |
| 3787 | curr_time_usec = GET_JIFFIES_USEC(); |
| 3788 | elapsed_usec = |
| 3789 | (curr_time - info->last_tx_active) * (1000000/HZ) + |
| 3790 | curr_time_usec - info->last_tx_active_usec; |
| 3791 | } |
| 3792 | set_current_state(TASK_RUNNING); |
| 3793 | } |
| 3794 | |
| 3795 | /* |
| 3796 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 3797 | */ |
| 3798 | void |
| 3799 | rs_hangup(struct tty_struct *tty) |
| 3800 | { |
| 3801 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 3802 | |
| 3803 | rs_flush_buffer(tty); |
| 3804 | shutdown(info); |
| 3805 | info->event = 0; |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3806 | info->port.count = 0; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3807 | info->port.flags &= ~ASYNC_NORMAL_ACTIVE; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 3808 | info->port.tty = NULL; |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3809 | wake_up_interruptible(&info->port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3810 | } |
| 3811 | |
| 3812 | /* |
| 3813 | * ------------------------------------------------------------ |
| 3814 | * rs_open() and friends |
| 3815 | * ------------------------------------------------------------ |
| 3816 | */ |
| 3817 | static int |
| 3818 | block_til_ready(struct tty_struct *tty, struct file * filp, |
| 3819 | struct e100_serial *info) |
| 3820 | { |
| 3821 | DECLARE_WAITQUEUE(wait, current); |
| 3822 | unsigned long flags; |
| 3823 | int retval; |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3824 | int do_clocal = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3825 | |
| 3826 | /* |
| 3827 | * If the device is in the middle of being closed, then block |
| 3828 | * until it's done, and then try again. |
| 3829 | */ |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3830 | if (info->port.flags & ASYNC_CLOSING) { |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3831 | wait_event_interruptible_tty(tty, info->port.close_wait, |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3832 | !(info->port.flags & ASYNC_CLOSING)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3833 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3834 | if (info->port.flags & ASYNC_HUP_NOTIFY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3835 | return -EAGAIN; |
| 3836 | else |
| 3837 | return -ERESTARTSYS; |
| 3838 | #else |
| 3839 | return -EAGAIN; |
| 3840 | #endif |
| 3841 | } |
| 3842 | |
| 3843 | /* |
| 3844 | * If non-blocking mode is set, or the port is not enabled, |
| 3845 | * then make the check up front and then exit. |
| 3846 | */ |
| 3847 | if ((filp->f_flags & O_NONBLOCK) || |
| 3848 | (tty->flags & (1 << TTY_IO_ERROR))) { |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3849 | info->port.flags |= ASYNC_NORMAL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3850 | return 0; |
| 3851 | } |
| 3852 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 3853 | if (tty->termios.c_cflag & CLOCAL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3854 | do_clocal = 1; |
| 3855 | } |
| 3856 | |
| 3857 | /* |
| 3858 | * Block waiting for the carrier detect and the line to become |
| 3859 | * free (i.e., not in use by the callout). While we are in |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3860 | * this loop, info->port.count is dropped by one, so that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3861 | * rs_close() knows when to free things. We restore it upon |
| 3862 | * exit, either normal or abnormal. |
| 3863 | */ |
| 3864 | retval = 0; |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3865 | add_wait_queue(&info->port.open_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3866 | #ifdef SERIAL_DEBUG_OPEN |
| 3867 | printk("block_til_ready before block: ttyS%d, count = %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3868 | info->line, info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3869 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3870 | local_irq_save(flags); |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3871 | info->port.count--; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3872 | local_irq_restore(flags); |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3873 | info->port.blocked_open++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3874 | while (1) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3875 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3876 | /* assert RTS and DTR */ |
| 3877 | e100_rts(info, 1); |
| 3878 | e100_dtr(info, 1); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3879 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3880 | set_current_state(TASK_INTERRUPTIBLE); |
| 3881 | if (tty_hung_up_p(filp) || |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3882 | !(info->port.flags & ASYNC_INITIALIZED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3883 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3884 | if (info->port.flags & ASYNC_HUP_NOTIFY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3885 | retval = -EAGAIN; |
| 3886 | else |
| 3887 | retval = -ERESTARTSYS; |
| 3888 | #else |
| 3889 | retval = -EAGAIN; |
| 3890 | #endif |
| 3891 | break; |
| 3892 | } |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3893 | if (!(info->port.flags & ASYNC_CLOSING) && do_clocal) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3894 | /* && (do_clocal || DCD_IS_ASSERTED) */ |
| 3895 | break; |
| 3896 | if (signal_pending(current)) { |
| 3897 | retval = -ERESTARTSYS; |
| 3898 | break; |
| 3899 | } |
| 3900 | #ifdef SERIAL_DEBUG_OPEN |
| 3901 | printk("block_til_ready blocking: ttyS%d, count = %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3902 | info->line, info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3903 | #endif |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 3904 | tty_unlock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3905 | schedule(); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 3906 | tty_lock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3907 | } |
| 3908 | set_current_state(TASK_RUNNING); |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3909 | remove_wait_queue(&info->port.open_wait, &wait); |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3910 | if (!tty_hung_up_p(filp)) |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3911 | info->port.count++; |
| 3912 | info->port.blocked_open--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3913 | #ifdef SERIAL_DEBUG_OPEN |
| 3914 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3915 | info->line, info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3916 | #endif |
| 3917 | if (retval) |
| 3918 | return retval; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3919 | info->port.flags |= ASYNC_NORMAL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3920 | return 0; |
| 3921 | } |
| 3922 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3923 | static void |
| 3924 | deinit_port(struct e100_serial *info) |
| 3925 | { |
| 3926 | if (info->dma_out_enabled) { |
| 3927 | cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); |
| 3928 | free_irq(info->dma_out_irq_nbr, info); |
| 3929 | } |
| 3930 | if (info->dma_in_enabled) { |
| 3931 | cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); |
| 3932 | free_irq(info->dma_in_irq_nbr, info); |
| 3933 | } |
| 3934 | } |
| 3935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3936 | /* |
| 3937 | * This routine is called whenever a serial port is opened. |
| 3938 | * It performs the serial-specific initialization for the tty structure. |
| 3939 | */ |
| 3940 | static int |
| 3941 | rs_open(struct tty_struct *tty, struct file * filp) |
| 3942 | { |
| 3943 | struct e100_serial *info; |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 3944 | int retval; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3945 | int allocated_resources = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3946 | |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 3947 | info = rs_table + tty->index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3948 | if (!info->enabled) |
| 3949 | return -ENODEV; |
| 3950 | |
| 3951 | #ifdef SERIAL_DEBUG_OPEN |
| 3952 | printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name, |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3953 | info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3954 | #endif |
| 3955 | |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3956 | info->port.count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3957 | tty->driver_data = info; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 3958 | info->port.tty = tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3959 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3960 | info->port.low_latency = !!(info->port.flags & ASYNC_LOW_LATENCY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3961 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3962 | /* |
| 3963 | * If the port is in the middle of closing, bail out now |
| 3964 | */ |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3965 | if (info->port.flags & ASYNC_CLOSING) { |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3966 | wait_event_interruptible_tty(tty, info->port.close_wait, |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3967 | !(info->port.flags & ASYNC_CLOSING)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3968 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3969 | return ((info->port.flags & ASYNC_HUP_NOTIFY) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3970 | -EAGAIN : -ERESTARTSYS); |
| 3971 | #else |
| 3972 | return -EAGAIN; |
| 3973 | #endif |
| 3974 | } |
| 3975 | |
| 3976 | /* |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3977 | * If DMA is enabled try to allocate the irq's. |
| 3978 | */ |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3979 | if (info->port.count == 1) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3980 | allocated_resources = 1; |
| 3981 | if (info->dma_in_enabled) { |
| 3982 | if (request_irq(info->dma_in_irq_nbr, |
| 3983 | rec_interrupt, |
| 3984 | info->dma_in_irq_flags, |
| 3985 | info->dma_in_irq_description, |
| 3986 | info)) { |
| 3987 | printk(KERN_WARNING "DMA irq '%s' busy; " |
| 3988 | "falling back to non-DMA mode\n", |
| 3989 | info->dma_in_irq_description); |
| 3990 | /* Make sure we never try to use DMA in */ |
| 3991 | /* for the port again. */ |
| 3992 | info->dma_in_enabled = 0; |
| 3993 | } else if (cris_request_dma(info->dma_in_nbr, |
| 3994 | info->dma_in_irq_description, |
| 3995 | DMA_VERBOSE_ON_ERROR, |
| 3996 | info->dma_owner)) { |
| 3997 | free_irq(info->dma_in_irq_nbr, info); |
| 3998 | printk(KERN_WARNING "DMA '%s' busy; " |
| 3999 | "falling back to non-DMA mode\n", |
| 4000 | info->dma_in_irq_description); |
| 4001 | /* Make sure we never try to use DMA in */ |
| 4002 | /* for the port again. */ |
| 4003 | info->dma_in_enabled = 0; |
| 4004 | } |
| 4005 | #ifdef SERIAL_DEBUG_OPEN |
| 4006 | else |
| 4007 | printk(KERN_DEBUG "DMA irq '%s' allocated\n", |
| 4008 | info->dma_in_irq_description); |
| 4009 | #endif |
| 4010 | } |
| 4011 | if (info->dma_out_enabled) { |
| 4012 | if (request_irq(info->dma_out_irq_nbr, |
| 4013 | tr_interrupt, |
| 4014 | info->dma_out_irq_flags, |
| 4015 | info->dma_out_irq_description, |
| 4016 | info)) { |
| 4017 | printk(KERN_WARNING "DMA irq '%s' busy; " |
| 4018 | "falling back to non-DMA mode\n", |
| 4019 | info->dma_out_irq_description); |
| 4020 | /* Make sure we never try to use DMA out */ |
| 4021 | /* for the port again. */ |
| 4022 | info->dma_out_enabled = 0; |
| 4023 | } else if (cris_request_dma(info->dma_out_nbr, |
| 4024 | info->dma_out_irq_description, |
| 4025 | DMA_VERBOSE_ON_ERROR, |
| 4026 | info->dma_owner)) { |
| 4027 | free_irq(info->dma_out_irq_nbr, info); |
| 4028 | printk(KERN_WARNING "DMA '%s' busy; " |
| 4029 | "falling back to non-DMA mode\n", |
| 4030 | info->dma_out_irq_description); |
| 4031 | /* Make sure we never try to use DMA out */ |
| 4032 | /* for the port again. */ |
| 4033 | info->dma_out_enabled = 0; |
| 4034 | } |
| 4035 | #ifdef SERIAL_DEBUG_OPEN |
| 4036 | else |
| 4037 | printk(KERN_DEBUG "DMA irq '%s' allocated\n", |
| 4038 | info->dma_out_irq_description); |
| 4039 | #endif |
| 4040 | } |
| 4041 | } |
| 4042 | |
| 4043 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4044 | * Start up the serial port |
| 4045 | */ |
| 4046 | |
| 4047 | retval = startup(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4048 | if (retval) { |
| 4049 | if (allocated_resources) |
| 4050 | deinit_port(info); |
| 4051 | |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 4052 | /* FIXME Decrease count info->port.count here too? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4053 | return retval; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4054 | } |
| 4055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4056 | |
| 4057 | retval = block_til_ready(tty, filp, info); |
| 4058 | if (retval) { |
| 4059 | #ifdef SERIAL_DEBUG_OPEN |
| 4060 | printk("rs_open returning after block_til_ready with %d\n", |
| 4061 | retval); |
| 4062 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4063 | if (allocated_resources) |
| 4064 | deinit_port(info); |
| 4065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4066 | return retval; |
| 4067 | } |
| 4068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4069 | #ifdef SERIAL_DEBUG_OPEN |
| 4070 | printk("rs_open ttyS%d successful...\n", info->line); |
| 4071 | #endif |
| 4072 | DLOG_INT_TRIG( log_int_pos = 0); |
| 4073 | |
| 4074 | DFLIP( if (info->line == SERIAL_DEBUG_LINE) { |
| 4075 | info->icount.rx = 0; |
| 4076 | } ); |
| 4077 | |
| 4078 | return 0; |
| 4079 | } |
| 4080 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4081 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4082 | /* |
| 4083 | * /proc fs routines.... |
| 4084 | */ |
| 4085 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4086 | static void seq_line_info(struct seq_file *m, struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4087 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4088 | unsigned long tmp; |
| 4089 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4090 | seq_printf(m, "%d: uart:E100 port:%lX irq:%d", |
| 4091 | info->line, (unsigned long)info->ioport, info->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4092 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 4093 | if (!info->ioport || (info->type == PORT_UNKNOWN)) { |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4094 | seq_printf(m, "\n"); |
| 4095 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4096 | } |
| 4097 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4098 | seq_printf(m, " baud:%d", info->baud); |
| 4099 | seq_printf(m, " tx:%lu rx:%lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4100 | (unsigned long)info->icount.tx, |
| 4101 | (unsigned long)info->icount.rx); |
| 4102 | tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4103 | if (tmp) |
| 4104 | seq_printf(m, " tx_pend:%lu/%lu", |
| 4105 | (unsigned long)tmp, |
| 4106 | (unsigned long)SERIAL_XMIT_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4107 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4108 | seq_printf(m, " rx_pend:%lu/%lu", |
| 4109 | (unsigned long)info->recv_cnt, |
| 4110 | (unsigned long)info->max_recv_cnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4111 | |
| 4112 | #if 1 |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 4113 | if (info->port.tty) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 4114 | if (info->port.tty->stopped) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4115 | seq_printf(m, " stopped:%i", |
| 4116 | (int)info->port.tty->stopped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4117 | } |
| 4118 | |
| 4119 | { |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 4120 | unsigned char rstat = info->ioport[REG_STATUS]; |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4121 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect)) |
| 4122 | seq_printf(m, " xoff_detect:1"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4123 | } |
| 4124 | |
| 4125 | #endif |
| 4126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4127 | if (info->icount.frame) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4128 | seq_printf(m, " fe:%lu", (unsigned long)info->icount.frame); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4129 | |
| 4130 | if (info->icount.parity) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4131 | seq_printf(m, " pe:%lu", (unsigned long)info->icount.parity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4132 | |
| 4133 | if (info->icount.brk) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4134 | seq_printf(m, " brk:%lu", (unsigned long)info->icount.brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4135 | |
| 4136 | if (info->icount.overrun) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4137 | seq_printf(m, " oe:%lu", (unsigned long)info->icount.overrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4138 | |
| 4139 | /* |
| 4140 | * Last thing is the RS-232 status lines |
| 4141 | */ |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4142 | if (!E100_RTS_GET(info)) |
| 4143 | seq_puts(m, "|RTS"); |
| 4144 | if (!E100_CTS_GET(info)) |
| 4145 | seq_puts(m, "|CTS"); |
| 4146 | if (!E100_DTR_GET(info)) |
| 4147 | seq_puts(m, "|DTR"); |
| 4148 | if (!E100_DSR_GET(info)) |
| 4149 | seq_puts(m, "|DSR"); |
| 4150 | if (!E100_CD_GET(info)) |
| 4151 | seq_puts(m, "|CD"); |
| 4152 | if (!E100_RI_GET(info)) |
| 4153 | seq_puts(m, "|RI"); |
| 4154 | seq_puts(m, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4155 | } |
| 4156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4157 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4158 | static int crisv10_proc_show(struct seq_file *m, void *v) |
| 4159 | { |
| 4160 | int i; |
| 4161 | |
| 4162 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
| 4163 | |
| 4164 | for (i = 0; i < NR_PORTS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4165 | if (!rs_table[i].enabled) |
| 4166 | continue; |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4167 | seq_line_info(m, &rs_table[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4168 | } |
| 4169 | #ifdef DEBUG_LOG_INCLUDED |
| 4170 | for (i = 0; i < debug_log_pos; i++) { |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4171 | seq_printf(m, "%-4i %lu.%lu ", |
| 4172 | i, debug_log[i].time, |
| 4173 | timer_data_to_ns(debug_log[i].timer_data)); |
| 4174 | seq_printf(m, debug_log[i].string, debug_log[i].value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4175 | } |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4176 | seq_printf(m, "debug_log %i/%i\n", i, DEBUG_LOG_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4177 | debug_log_pos = 0; |
| 4178 | #endif |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4179 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4180 | } |
| 4181 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4182 | static int crisv10_proc_open(struct inode *inode, struct file *file) |
| 4183 | { |
| 4184 | return single_open(file, crisv10_proc_show, NULL); |
| 4185 | } |
| 4186 | |
| 4187 | static const struct file_operations crisv10_proc_fops = { |
| 4188 | .owner = THIS_MODULE, |
| 4189 | .open = crisv10_proc_open, |
| 4190 | .read = seq_read, |
| 4191 | .llseek = seq_lseek, |
| 4192 | .release = single_release, |
| 4193 | }; |
| 4194 | #endif |
| 4195 | |
| 4196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4197 | /* Finally, routines used to initialize the serial driver. */ |
| 4198 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4199 | static void show_serial_version(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4200 | { |
| 4201 | printk(KERN_INFO |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4202 | "ETRAX 100LX serial-driver %s, " |
| 4203 | "(c) 2000-2004 Axis Communications AB\r\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4204 | &serial_version[11]); /* "$Revision: x.yy" */ |
| 4205 | } |
| 4206 | |
| 4207 | /* rs_init inits the driver at boot (using the module_init chain) */ |
| 4208 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 4209 | static const struct tty_operations rs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4210 | .open = rs_open, |
| 4211 | .close = rs_close, |
| 4212 | .write = rs_write, |
| 4213 | .flush_chars = rs_flush_chars, |
| 4214 | .write_room = rs_write_room, |
| 4215 | .chars_in_buffer = rs_chars_in_buffer, |
| 4216 | .flush_buffer = rs_flush_buffer, |
| 4217 | .ioctl = rs_ioctl, |
| 4218 | .throttle = rs_throttle, |
| 4219 | .unthrottle = rs_unthrottle, |
| 4220 | .set_termios = rs_set_termios, |
| 4221 | .stop = rs_stop, |
| 4222 | .start = rs_start, |
| 4223 | .hangup = rs_hangup, |
| 4224 | .break_ctl = rs_break, |
| 4225 | .send_xchar = rs_send_xchar, |
| 4226 | .wait_until_sent = rs_wait_until_sent, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4227 | .tiocmget = rs_tiocmget, |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4228 | .tiocmset = rs_tiocmset, |
| 4229 | #ifdef CONFIG_PROC_FS |
| 4230 | .proc_fops = &crisv10_proc_fops, |
| 4231 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4232 | }; |
| 4233 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4234 | static int __init rs_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4235 | { |
| 4236 | int i; |
| 4237 | struct e100_serial *info; |
| 4238 | struct tty_driver *driver = alloc_tty_driver(NR_PORTS); |
| 4239 | |
| 4240 | if (!driver) |
| 4241 | return -ENOMEM; |
| 4242 | |
| 4243 | show_serial_version(); |
| 4244 | |
| 4245 | /* Setup the timed flush handler system */ |
| 4246 | |
| 4247 | #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4248 | setup_timer(&flush_timer, timed_flush_handler, 0); |
| 4249 | mod_timer(&flush_timer, jiffies + 5); |
| 4250 | #endif |
| 4251 | |
| 4252 | #if defined(CONFIG_ETRAX_RS485) |
| 4253 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
WANG Cong | 2f7861d | 2011-09-01 13:58:29 +0800 | [diff] [blame] | 4254 | if (cris_io_interface_allocate_pins(if_serial_0, 'a', rs485_pa_bit, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4255 | rs485_pa_bit)) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 4256 | printk(KERN_ERR "ETRAX100LX serial: Could not allocate " |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4257 | "RS485 pin\n"); |
Julia Lawall | 41ca732 | 2008-10-13 10:31:37 +0100 | [diff] [blame] | 4258 | put_tty_driver(driver); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4259 | return -EBUSY; |
| 4260 | } |
| 4261 | #endif |
| 4262 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
WANG Cong | 2f7861d | 2011-09-01 13:58:29 +0800 | [diff] [blame] | 4263 | if (cris_io_interface_allocate_pins(if_serial_0, 'g', rs485_pa_bit, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4264 | rs485_port_g_bit)) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 4265 | printk(KERN_ERR "ETRAX100LX serial: Could not allocate " |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4266 | "RS485 pin\n"); |
Julia Lawall | 41ca732 | 2008-10-13 10:31:37 +0100 | [diff] [blame] | 4267 | put_tty_driver(driver); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4268 | return -EBUSY; |
| 4269 | } |
| 4270 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4271 | #endif |
| 4272 | |
| 4273 | /* Initialize the tty_driver structure */ |
| 4274 | |
| 4275 | driver->driver_name = "serial"; |
| 4276 | driver->name = "ttyS"; |
| 4277 | driver->major = TTY_MAJOR; |
| 4278 | driver->minor_start = 64; |
| 4279 | driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 4280 | driver->subtype = SERIAL_TYPE_NORMAL; |
| 4281 | driver->init_termios = tty_std_termios; |
| 4282 | driver->init_termios.c_cflag = |
| 4283 | B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */ |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 4284 | driver->init_termios.c_ispeed = 115200; |
| 4285 | driver->init_termios.c_ospeed = 115200; |
Jiri Slaby | c4d6ebe | 2012-08-07 21:47:48 +0200 | [diff] [blame] | 4286 | driver->flags = TTY_DRIVER_REAL_RAW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4287 | |
| 4288 | tty_set_operations(driver, &rs_ops); |
| 4289 | serial_driver = driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4290 | |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 4291 | /* do some initializing for the separate ports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4292 | for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4293 | if (info->enabled) { |
| 4294 | if (cris_request_io_interface(info->io_if, |
| 4295 | info->io_if_description)) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 4296 | printk(KERN_ERR "ETRAX100LX async serial: " |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4297 | "Could not allocate IO pins for " |
| 4298 | "%s, port %d\n", |
| 4299 | info->io_if_description, i); |
| 4300 | info->enabled = 0; |
| 4301 | } |
| 4302 | } |
Jiri Slaby | 953756e | 2012-04-02 13:53:46 +0200 | [diff] [blame] | 4303 | tty_port_init(&info->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4304 | info->uses_dma_in = 0; |
| 4305 | info->uses_dma_out = 0; |
| 4306 | info->line = i; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 4307 | info->port.tty = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4308 | info->type = PORT_ETRAX; |
| 4309 | info->tr_running = 0; |
| 4310 | info->forced_eop = 0; |
| 4311 | info->baud_base = DEF_BAUD_BASE; |
| 4312 | info->custom_divisor = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4313 | info->x_char = 0; |
| 4314 | info->event = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4315 | info->xmit.buf = NULL; |
| 4316 | info->xmit.tail = info->xmit.head = 0; |
| 4317 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 4318 | info->recv_cnt = info->max_recv_cnt = 0; |
| 4319 | info->last_tx_active_usec = 0; |
| 4320 | info->last_tx_active = 0; |
| 4321 | |
| 4322 | #if defined(CONFIG_ETRAX_RS485) |
| 4323 | /* Set sane defaults */ |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 4324 | info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND); |
| 4325 | info->rs485.flags |= SER_RS485_RTS_AFTER_SEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4326 | info->rs485.delay_rts_before_send = 0; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 4327 | info->rs485.flags &= ~(SER_RS485_ENABLED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4328 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4329 | INIT_WORK(&info->work, do_softint); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4330 | |
| 4331 | if (info->enabled) { |
Kulikov Vasiliy | 078dee2 | 2010-07-14 22:04:42 +0400 | [diff] [blame] | 4332 | printk(KERN_INFO "%s%d at %p is a builtin UART with DMA\n", |
| 4333 | serial_driver->name, info->line, info->ioport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4334 | } |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 4335 | tty_port_link_device(&info->port, driver, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4336 | } |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 4337 | |
| 4338 | if (tty_register_driver(driver)) |
| 4339 | panic("Couldn't register serial driver\n"); |
| 4340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4341 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 4342 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 4343 | memset(fast_timers, 0, sizeof(fast_timers)); |
| 4344 | #endif |
| 4345 | #ifdef CONFIG_ETRAX_RS485 |
| 4346 | memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485)); |
| 4347 | #endif |
| 4348 | fast_timer_init(); |
| 4349 | #endif |
| 4350 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4351 | #ifndef CONFIG_ETRAX_KGDB |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4352 | /* Not needed in simulator. May only complicate stuff. */ |
| 4353 | /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */ |
| 4354 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4355 | if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 4356 | IRQF_SHARED, "serial ", driver)) |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 4357 | panic("%s: Failed to request irq8", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4359 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4361 | return 0; |
| 4362 | } |
| 4363 | |
| 4364 | /* this makes sure that rs_init is called during kernel boot */ |
| 4365 | |
| 4366 | module_init(rs_init); |