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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* |
| 60 | * All of the compatibilty code so we can compile serial.c against |
| 61 | * older kernels is hidden in serial_compat.h |
| 62 | */ |
| 63 | #if defined(LOCAL_HEADERS) |
| 64 | #include "serial_compat.h" |
| 65 | #endif |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | struct tty_driver *serial_driver; |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* number of characters left in xmit buffer before we ask for more */ |
| 70 | #define WAKEUP_CHARS 256 |
| 71 | |
| 72 | //#define SERIAL_DEBUG_INTR |
| 73 | //#define SERIAL_DEBUG_OPEN |
| 74 | //#define SERIAL_DEBUG_FLOW |
| 75 | //#define SERIAL_DEBUG_DATA |
| 76 | //#define SERIAL_DEBUG_THROTTLE |
| 77 | //#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */ |
| 78 | //#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */ |
| 79 | |
| 80 | /* Enable this to use serial interrupts to handle when you |
| 81 | expect the first received event on the serial port to |
| 82 | be an error, break or similar. Used to be able to flash IRMA |
| 83 | from eLinux */ |
| 84 | #define SERIAL_HANDLE_EARLY_ERRORS |
| 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | /* Currently 16 descriptors x 128 bytes = 2048 bytes */ |
| 87 | #define SERIAL_DESCR_BUF_SIZE 256 |
| 88 | |
| 89 | #define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */ |
| 90 | #define DEF_BAUD_BASE SERIAL_PRESCALE_BASE |
| 91 | |
| 92 | /* We don't want to load the system with massive fast timer interrupt |
| 93 | * on high baudrates so limit it to 250 us (4kHz) */ |
| 94 | #define MIN_FLUSH_TIME_USEC 250 |
| 95 | |
| 96 | /* Add an x here to log a lot of timer stuff */ |
| 97 | #define TIMERD(x) |
| 98 | /* Debug details of interrupt handling */ |
| 99 | #define DINTR1(x) /* irq on/off, errors */ |
| 100 | #define DINTR2(x) /* tx and rx */ |
| 101 | /* Debug flip buffer stuff */ |
| 102 | #define DFLIP(x) |
| 103 | /* Debug flow control and overview of data flow */ |
| 104 | #define DFLOW(x) |
| 105 | #define DBAUD(x) |
| 106 | #define DLOG_INT_TRIG(x) |
| 107 | |
| 108 | //#define DEBUG_LOG_INCLUDED |
| 109 | #ifndef DEBUG_LOG_INCLUDED |
| 110 | #define DEBUG_LOG(line, string, value) |
| 111 | #else |
| 112 | struct debug_log_info |
| 113 | { |
| 114 | unsigned long time; |
| 115 | unsigned long timer_data; |
| 116 | // int line; |
| 117 | const char *string; |
| 118 | int value; |
| 119 | }; |
| 120 | #define DEBUG_LOG_SIZE 4096 |
| 121 | |
| 122 | struct debug_log_info debug_log[DEBUG_LOG_SIZE]; |
| 123 | int debug_log_pos = 0; |
| 124 | |
| 125 | #define DEBUG_LOG(_line, _string, _value) do { \ |
| 126 | if ((_line) == SERIAL_DEBUG_LINE) {\ |
| 127 | debug_log_func(_line, _string, _value); \ |
| 128 | }\ |
| 129 | }while(0) |
| 130 | |
| 131 | void debug_log_func(int line, const char *string, int value) |
| 132 | { |
| 133 | if (debug_log_pos < DEBUG_LOG_SIZE) { |
| 134 | debug_log[debug_log_pos].time = jiffies; |
| 135 | debug_log[debug_log_pos].timer_data = *R_TIMER_DATA; |
| 136 | // debug_log[debug_log_pos].line = line; |
| 137 | debug_log[debug_log_pos].string = string; |
| 138 | debug_log[debug_log_pos].value = value; |
| 139 | debug_log_pos++; |
| 140 | } |
| 141 | /*printk(string, value);*/ |
| 142 | } |
| 143 | #endif |
| 144 | |
| 145 | #ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS |
| 146 | /* Default number of timer ticks before flushing rx fifo |
| 147 | * When using "little data, low latency applications: use 0 |
| 148 | * When using "much data applications (PPP)" use ~5 |
| 149 | */ |
| 150 | #define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5 |
| 151 | #endif |
| 152 | |
| 153 | unsigned long timer_data_to_ns(unsigned long timer_data); |
| 154 | |
| 155 | static void change_speed(struct e100_serial *info); |
| 156 | static void rs_throttle(struct tty_struct * tty); |
| 157 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 158 | static int rs_write(struct tty_struct *tty, |
| 159 | const unsigned char *buf, int count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | #ifdef CONFIG_ETRAX_RS485 |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 161 | static int e100_write_rs485(struct tty_struct *tty, |
| 162 | const unsigned char *buf, int count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 164 | static int get_lsr_info(struct e100_serial *info, unsigned int *value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
| 166 | |
| 167 | #define DEF_BAUD 115200 /* 115.2 kbit/s */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | #define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */ |
| 169 | /* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */ |
| 170 | #define DEF_TX 0x80 /* or SERIAL_CTRL_B */ |
| 171 | |
| 172 | /* offsets from R_SERIALx_CTRL */ |
| 173 | |
| 174 | #define REG_DATA 0 |
| 175 | #define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */ |
| 176 | #define REG_TR_DATA 0 |
| 177 | #define REG_STATUS 1 |
| 178 | #define REG_TR_CTRL 1 |
| 179 | #define REG_REC_CTRL 2 |
| 180 | #define REG_BAUD 3 |
| 181 | #define REG_XOFF 4 /* this is a 32 bit register */ |
| 182 | |
| 183 | /* The bitfields are the same for all serial ports */ |
| 184 | #define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd) |
| 185 | #define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail) |
| 186 | #define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err) |
| 187 | #define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err) |
| 188 | #define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun) |
| 189 | |
| 190 | #define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK) |
| 191 | |
| 192 | /* Values for info->errorcode */ |
| 193 | #define ERRCODE_SET_BREAK (TTY_BREAK) |
| 194 | #define ERRCODE_INSERT 0x100 |
| 195 | #define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK) |
| 196 | |
| 197 | #define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop; |
| 198 | |
| 199 | /* |
| 200 | * General note regarding the use of IO_* macros in this file: |
| 201 | * |
| 202 | * We will use the bits defined for DMA channel 6 when using various |
| 203 | * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are |
| 204 | * the same for all channels (which of course they are). |
| 205 | * |
| 206 | * We will also use the bits defined for serial port 0 when writing commands |
| 207 | * to the different ports, as these bits too are the same for all ports. |
| 208 | */ |
| 209 | |
| 210 | |
| 211 | /* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */ |
| 212 | static const unsigned long e100_ser_int_mask = 0 |
| 213 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 214 | | IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
| 215 | #endif |
| 216 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 217 | | IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
| 218 | #endif |
| 219 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 220 | | IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
| 221 | #endif |
| 222 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 223 | | IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready) |
| 224 | #endif |
| 225 | ; |
| 226 | unsigned long r_alt_ser_baudrate_shadow = 0; |
| 227 | |
| 228 | /* this is the data for the four serial ports in the etrax100 */ |
| 229 | /* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */ |
| 230 | /* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */ |
| 231 | |
| 232 | static struct e100_serial rs_table[] = { |
| 233 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 234 | .ioport = (unsigned char *)R_SERIAL0_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | .irq = 1U << 12, /* uses DMA 6 and 7 */ |
| 236 | .oclrintradr = R_DMA_CH6_CLR_INTR, |
| 237 | .ofirstadr = R_DMA_CH6_FIRST, |
| 238 | .ocmdadr = R_DMA_CH6_CMD, |
| 239 | .ostatusadr = R_DMA_CH6_STATUS, |
| 240 | .iclrintradr = R_DMA_CH7_CLR_INTR, |
| 241 | .ifirstadr = R_DMA_CH7_FIRST, |
| 242 | .icmdadr = R_DMA_CH7_CMD, |
| 243 | .idescradr = R_DMA_CH7_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | .rx_ctrl = DEF_RX, |
| 245 | .tx_ctrl = DEF_TX, |
| 246 | .iseteop = 2, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 247 | .dma_owner = dma_ser0, |
| 248 | .io_if = if_serial_0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 250 | .enabled = 1, |
| 251 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT |
| 252 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 253 | .dma_out_nbr = SER0_TX_DMA_NBR, |
| 254 | .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 255 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 256 | .dma_out_irq_description = "serial 0 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | #else |
| 258 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 259 | .dma_out_nbr = UINT_MAX, |
| 260 | .dma_out_irq_nbr = 0, |
| 261 | .dma_out_irq_flags = 0, |
| 262 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | #endif |
| 264 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN |
| 265 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 266 | .dma_in_nbr = SER0_RX_DMA_NBR, |
| 267 | .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 268 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 269 | .dma_in_irq_description = "serial 0 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 271 | .dma_in_enabled = 0, |
| 272 | .dma_in_nbr = UINT_MAX, |
| 273 | .dma_in_irq_nbr = 0, |
| 274 | .dma_in_irq_flags = 0, |
| 275 | .dma_in_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | #endif |
| 277 | #else |
| 278 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 279 | .io_if_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | .dma_out_enabled = 0, |
| 281 | .dma_in_enabled = 0 |
| 282 | #endif |
| 283 | |
| 284 | }, /* ttyS0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 286 | .ioport = (unsigned char *)R_SERIAL1_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | .irq = 1U << 16, /* uses DMA 8 and 9 */ |
| 288 | .oclrintradr = R_DMA_CH8_CLR_INTR, |
| 289 | .ofirstadr = R_DMA_CH8_FIRST, |
| 290 | .ocmdadr = R_DMA_CH8_CMD, |
| 291 | .ostatusadr = R_DMA_CH8_STATUS, |
| 292 | .iclrintradr = R_DMA_CH9_CLR_INTR, |
| 293 | .ifirstadr = R_DMA_CH9_FIRST, |
| 294 | .icmdadr = R_DMA_CH9_CMD, |
| 295 | .idescradr = R_DMA_CH9_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | .rx_ctrl = DEF_RX, |
| 297 | .tx_ctrl = DEF_TX, |
| 298 | .iseteop = 3, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 299 | .dma_owner = dma_ser1, |
| 300 | .io_if = if_serial_1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 302 | .enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 303 | .io_if_description = "ser1", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT |
| 305 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 306 | .dma_out_nbr = SER1_TX_DMA_NBR, |
| 307 | .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 308 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 309 | .dma_out_irq_description = "serial 1 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | #else |
| 311 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 312 | .dma_out_nbr = UINT_MAX, |
| 313 | .dma_out_irq_nbr = 0, |
| 314 | .dma_out_irq_flags = 0, |
| 315 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | #endif |
| 317 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN |
| 318 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 319 | .dma_in_nbr = SER1_RX_DMA_NBR, |
| 320 | .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 321 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 322 | .dma_in_irq_description = "serial 1 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 324 | .dma_in_enabled = 0, |
| 325 | .dma_in_enabled = 0, |
| 326 | .dma_in_nbr = UINT_MAX, |
| 327 | .dma_in_irq_nbr = 0, |
| 328 | .dma_in_irq_flags = 0, |
| 329 | .dma_in_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | #endif |
| 331 | #else |
| 332 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 333 | .io_if_description = NULL, |
| 334 | .dma_in_irq_nbr = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | .dma_out_enabled = 0, |
| 336 | .dma_in_enabled = 0 |
| 337 | #endif |
| 338 | }, /* ttyS1 */ |
| 339 | |
| 340 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 341 | .ioport = (unsigned char *)R_SERIAL2_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | .irq = 1U << 4, /* uses DMA 2 and 3 */ |
| 343 | .oclrintradr = R_DMA_CH2_CLR_INTR, |
| 344 | .ofirstadr = R_DMA_CH2_FIRST, |
| 345 | .ocmdadr = R_DMA_CH2_CMD, |
| 346 | .ostatusadr = R_DMA_CH2_STATUS, |
| 347 | .iclrintradr = R_DMA_CH3_CLR_INTR, |
| 348 | .ifirstadr = R_DMA_CH3_FIRST, |
| 349 | .icmdadr = R_DMA_CH3_CMD, |
| 350 | .idescradr = R_DMA_CH3_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | .rx_ctrl = DEF_RX, |
| 352 | .tx_ctrl = DEF_TX, |
| 353 | .iseteop = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 354 | .dma_owner = dma_ser2, |
| 355 | .io_if = if_serial_2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 357 | .enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 358 | .io_if_description = "ser2", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT |
| 360 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 361 | .dma_out_nbr = SER2_TX_DMA_NBR, |
| 362 | .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 363 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 364 | .dma_out_irq_description = "serial 2 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | #else |
| 366 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 367 | .dma_out_nbr = UINT_MAX, |
| 368 | .dma_out_irq_nbr = 0, |
| 369 | .dma_out_irq_flags = 0, |
| 370 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | #endif |
| 372 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN |
| 373 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 374 | .dma_in_nbr = SER2_RX_DMA_NBR, |
| 375 | .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 376 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 377 | .dma_in_irq_description = "serial 2 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 379 | .dma_in_enabled = 0, |
| 380 | .dma_in_nbr = UINT_MAX, |
| 381 | .dma_in_irq_nbr = 0, |
| 382 | .dma_in_irq_flags = 0, |
| 383 | .dma_in_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | #endif |
| 385 | #else |
| 386 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 387 | .io_if_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | .dma_out_enabled = 0, |
| 389 | .dma_in_enabled = 0 |
| 390 | #endif |
| 391 | }, /* ttyS2 */ |
| 392 | |
| 393 | { .baud = DEF_BAUD, |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 394 | .ioport = (unsigned char *)R_SERIAL3_CTRL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | .irq = 1U << 8, /* uses DMA 4 and 5 */ |
| 396 | .oclrintradr = R_DMA_CH4_CLR_INTR, |
| 397 | .ofirstadr = R_DMA_CH4_FIRST, |
| 398 | .ocmdadr = R_DMA_CH4_CMD, |
| 399 | .ostatusadr = R_DMA_CH4_STATUS, |
| 400 | .iclrintradr = R_DMA_CH5_CLR_INTR, |
| 401 | .ifirstadr = R_DMA_CH5_FIRST, |
| 402 | .icmdadr = R_DMA_CH5_CMD, |
| 403 | .idescradr = R_DMA_CH5_DESCR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | .rx_ctrl = DEF_RX, |
| 405 | .tx_ctrl = DEF_TX, |
| 406 | .iseteop = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 407 | .dma_owner = dma_ser3, |
| 408 | .io_if = if_serial_3, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 410 | .enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 411 | .io_if_description = "ser3", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT |
| 413 | .dma_out_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 414 | .dma_out_nbr = SER3_TX_DMA_NBR, |
| 415 | .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 416 | .dma_out_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 417 | .dma_out_irq_description = "serial 3 dma tr", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | #else |
| 419 | .dma_out_enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 420 | .dma_out_nbr = UINT_MAX, |
| 421 | .dma_out_irq_nbr = 0, |
| 422 | .dma_out_irq_flags = 0, |
| 423 | .dma_out_irq_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | #endif |
| 425 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN |
| 426 | .dma_in_enabled = 1, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 427 | .dma_in_nbr = SER3_RX_DMA_NBR, |
| 428 | .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 429 | .dma_in_irq_flags = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 430 | .dma_in_irq_description = "serial 3 dma rec", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | #else |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 432 | .dma_in_enabled = 0, |
| 433 | .dma_in_nbr = UINT_MAX, |
| 434 | .dma_in_irq_nbr = 0, |
| 435 | .dma_in_irq_flags = 0, |
| 436 | .dma_in_irq_description = NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | #endif |
| 438 | #else |
| 439 | .enabled = 0, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 440 | .io_if_description = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | .dma_out_enabled = 0, |
| 442 | .dma_in_enabled = 0 |
| 443 | #endif |
| 444 | } /* ttyS3 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | }; |
| 446 | |
| 447 | |
| 448 | #define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial)) |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 451 | static struct fast_timer fast_timers[NR_PORTS]; |
| 452 | #endif |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | /* RS-485 */ |
| 455 | #if defined(CONFIG_ETRAX_RS485) |
| 456 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 457 | static struct fast_timer fast_timers_rs485[NR_PORTS]; |
| 458 | #endif |
| 459 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 460 | static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT; |
| 461 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | #endif |
| 463 | |
| 464 | /* Info and macros needed for each ports extra control/status signals. */ |
| 465 | #define E100_STRUCT_PORT(line, pinname) \ |
| 466 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 467 | (R_PORT_PA_DATA): ( \ |
| 468 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 469 | (R_PORT_PB_DATA):&dummy_ser[line])) |
| 470 | |
| 471 | #define E100_STRUCT_SHADOW(line, pinname) \ |
| 472 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 473 | (&port_pa_data_shadow): ( \ |
| 474 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 475 | (&port_pb_data_shadow):&dummy_ser[line])) |
| 476 | #define E100_STRUCT_MASK(line, pinname) \ |
| 477 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 478 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \ |
| 479 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 480 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK)) |
| 481 | |
| 482 | #define DUMMY_DTR_MASK 1 |
| 483 | #define DUMMY_RI_MASK 2 |
| 484 | #define DUMMY_DSR_MASK 4 |
| 485 | #define DUMMY_CD_MASK 8 |
| 486 | static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF}; |
| 487 | |
| 488 | /* If not all status pins are used or disabled, use mixed mode */ |
| 489 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 490 | |
| 491 | #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) |
| 492 | |
| 493 | #if SER0_PA_BITSUM != -4 |
| 494 | # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1 |
| 495 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 496 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 497 | # endif |
| 498 | # endif |
| 499 | # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1 |
| 500 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 501 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 502 | # endif |
| 503 | # endif |
| 504 | # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1 |
| 505 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 506 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 507 | # endif |
| 508 | # endif |
| 509 | # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1 |
| 510 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 511 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 512 | # endif |
| 513 | # endif |
| 514 | #endif |
| 515 | |
| 516 | #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) |
| 517 | |
| 518 | #if SER0_PB_BITSUM != -4 |
| 519 | # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1 |
| 520 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 521 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 522 | # endif |
| 523 | # endif |
| 524 | # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1 |
| 525 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 526 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 527 | # endif |
| 528 | # endif |
| 529 | # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1 |
| 530 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 531 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 532 | # endif |
| 533 | # endif |
| 534 | # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1 |
| 535 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 536 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 537 | # endif |
| 538 | # endif |
| 539 | #endif |
| 540 | |
| 541 | #endif /* PORT0 */ |
| 542 | |
| 543 | |
| 544 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 545 | |
| 546 | #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) |
| 547 | |
| 548 | #if SER1_PA_BITSUM != -4 |
| 549 | # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1 |
| 550 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 551 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 552 | # endif |
| 553 | # endif |
| 554 | # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1 |
| 555 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 556 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 557 | # endif |
| 558 | # endif |
| 559 | # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1 |
| 560 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 561 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 562 | # endif |
| 563 | # endif |
| 564 | # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1 |
| 565 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 566 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 567 | # endif |
| 568 | # endif |
| 569 | #endif |
| 570 | |
| 571 | #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) |
| 572 | |
| 573 | #if SER1_PB_BITSUM != -4 |
| 574 | # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1 |
| 575 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 576 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 577 | # endif |
| 578 | # endif |
| 579 | # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1 |
| 580 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 581 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 582 | # endif |
| 583 | # endif |
| 584 | # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1 |
| 585 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 586 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 587 | # endif |
| 588 | # endif |
| 589 | # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1 |
| 590 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 591 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 592 | # endif |
| 593 | # endif |
| 594 | #endif |
| 595 | |
| 596 | #endif /* PORT1 */ |
| 597 | |
| 598 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 599 | |
| 600 | #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) |
| 601 | |
| 602 | #if SER2_PA_BITSUM != -4 |
| 603 | # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1 |
| 604 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 605 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 606 | # endif |
| 607 | # endif |
| 608 | # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1 |
| 609 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 610 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 611 | # endif |
| 612 | # endif |
| 613 | # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1 |
| 614 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 615 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 616 | # endif |
| 617 | # endif |
| 618 | # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1 |
| 619 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 620 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 621 | # endif |
| 622 | # endif |
| 623 | #endif |
| 624 | |
| 625 | #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) |
| 626 | |
| 627 | #if SER2_PB_BITSUM != -4 |
| 628 | # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1 |
| 629 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 630 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 631 | # endif |
| 632 | # endif |
| 633 | # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1 |
| 634 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 635 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 636 | # endif |
| 637 | # endif |
| 638 | # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1 |
| 639 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 640 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 641 | # endif |
| 642 | # endif |
| 643 | # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1 |
| 644 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 645 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 646 | # endif |
| 647 | # endif |
| 648 | #endif |
| 649 | |
| 650 | #endif /* PORT2 */ |
| 651 | |
| 652 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 653 | |
| 654 | #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) |
| 655 | |
| 656 | #if SER3_PA_BITSUM != -4 |
| 657 | # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1 |
| 658 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 659 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 660 | # endif |
| 661 | # endif |
| 662 | # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1 |
| 663 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 664 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 665 | # endif |
| 666 | # endif |
| 667 | # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1 |
| 668 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 669 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 670 | # endif |
| 671 | # endif |
| 672 | # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1 |
| 673 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 674 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 675 | # endif |
| 676 | # endif |
| 677 | #endif |
| 678 | |
| 679 | #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) |
| 680 | |
| 681 | #if SER3_PB_BITSUM != -4 |
| 682 | # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1 |
| 683 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 684 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 685 | # endif |
| 686 | # endif |
| 687 | # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1 |
| 688 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 689 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 690 | # endif |
| 691 | # endif |
| 692 | # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1 |
| 693 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 694 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 695 | # endif |
| 696 | # endif |
| 697 | # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1 |
| 698 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 699 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 700 | # endif |
| 701 | # endif |
| 702 | #endif |
| 703 | |
| 704 | #endif /* PORT3 */ |
| 705 | |
| 706 | |
| 707 | #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \ |
| 708 | defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \ |
| 709 | defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \ |
| 710 | defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED) |
Valentin Rothberg | 74a7608 | 2015-04-11 15:56:03 +0200 | [diff] [blame] | 711 | #define ETRAX_SERX_DTR_RI_DSR_CD_MIXED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | #endif |
| 713 | |
Valentin Rothberg | 74a7608 | 2015-04-11 15:56:03 +0200 | [diff] [blame] | 714 | #ifdef ETRAX_SERX_DTR_RI_DSR_CD_MIXED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | /* The pins can be mixed on PA and PB */ |
| 716 | #define CONTROL_PINS_PORT_NOT_USED(line) \ |
| 717 | &dummy_ser[line], &dummy_ser[line], \ |
| 718 | &dummy_ser[line], &dummy_ser[line], \ |
| 719 | &dummy_ser[line], &dummy_ser[line], \ |
| 720 | &dummy_ser[line], &dummy_ser[line], \ |
| 721 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK |
| 722 | |
| 723 | |
| 724 | struct control_pins |
| 725 | { |
| 726 | volatile unsigned char *dtr_port; |
| 727 | unsigned char *dtr_shadow; |
| 728 | volatile unsigned char *ri_port; |
| 729 | unsigned char *ri_shadow; |
| 730 | volatile unsigned char *dsr_port; |
| 731 | unsigned char *dsr_shadow; |
| 732 | volatile unsigned char *cd_port; |
| 733 | unsigned char *cd_shadow; |
| 734 | |
| 735 | unsigned char dtr_mask; |
| 736 | unsigned char ri_mask; |
| 737 | unsigned char dsr_mask; |
| 738 | unsigned char cd_mask; |
| 739 | }; |
| 740 | |
| 741 | static const struct control_pins e100_modem_pins[NR_PORTS] = |
| 742 | { |
| 743 | /* Ser 0 */ |
| 744 | { |
| 745 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 746 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), |
| 747 | E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI), |
| 748 | E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR), |
| 749 | E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD), |
| 750 | E100_STRUCT_MASK(0,DTR), |
| 751 | E100_STRUCT_MASK(0,RI), |
| 752 | E100_STRUCT_MASK(0,DSR), |
| 753 | E100_STRUCT_MASK(0,CD) |
| 754 | #else |
| 755 | CONTROL_PINS_PORT_NOT_USED(0) |
| 756 | #endif |
| 757 | }, |
| 758 | |
| 759 | /* Ser 1 */ |
| 760 | { |
| 761 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 762 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), |
| 763 | E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI), |
| 764 | E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR), |
| 765 | E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD), |
| 766 | E100_STRUCT_MASK(1,DTR), |
| 767 | E100_STRUCT_MASK(1,RI), |
| 768 | E100_STRUCT_MASK(1,DSR), |
| 769 | E100_STRUCT_MASK(1,CD) |
| 770 | #else |
| 771 | CONTROL_PINS_PORT_NOT_USED(1) |
| 772 | #endif |
| 773 | }, |
| 774 | |
| 775 | /* Ser 2 */ |
| 776 | { |
| 777 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 778 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), |
| 779 | E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI), |
| 780 | E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR), |
| 781 | E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD), |
| 782 | E100_STRUCT_MASK(2,DTR), |
| 783 | E100_STRUCT_MASK(2,RI), |
| 784 | E100_STRUCT_MASK(2,DSR), |
| 785 | E100_STRUCT_MASK(2,CD) |
| 786 | #else |
| 787 | CONTROL_PINS_PORT_NOT_USED(2) |
| 788 | #endif |
| 789 | }, |
| 790 | |
| 791 | /* Ser 3 */ |
| 792 | { |
| 793 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 794 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), |
| 795 | E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI), |
| 796 | E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR), |
| 797 | E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD), |
| 798 | E100_STRUCT_MASK(3,DTR), |
| 799 | E100_STRUCT_MASK(3,RI), |
| 800 | E100_STRUCT_MASK(3,DSR), |
| 801 | E100_STRUCT_MASK(3,CD) |
| 802 | #else |
| 803 | CONTROL_PINS_PORT_NOT_USED(3) |
| 804 | #endif |
| 805 | } |
| 806 | }; |
Valentin Rothberg | 74a7608 | 2015-04-11 15:56:03 +0200 | [diff] [blame] | 807 | #else /* ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
| 809 | /* All pins are on either PA or PB for each serial port */ |
| 810 | #define CONTROL_PINS_PORT_NOT_USED(line) \ |
| 811 | &dummy_ser[line], &dummy_ser[line], \ |
| 812 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK |
| 813 | |
| 814 | |
| 815 | struct control_pins |
| 816 | { |
| 817 | volatile unsigned char *port; |
| 818 | unsigned char *shadow; |
| 819 | |
| 820 | unsigned char dtr_mask; |
| 821 | unsigned char ri_mask; |
| 822 | unsigned char dsr_mask; |
| 823 | unsigned char cd_mask; |
| 824 | }; |
| 825 | |
| 826 | #define dtr_port port |
| 827 | #define dtr_shadow shadow |
| 828 | #define ri_port port |
| 829 | #define ri_shadow shadow |
| 830 | #define dsr_port port |
| 831 | #define dsr_shadow shadow |
| 832 | #define cd_port port |
| 833 | #define cd_shadow shadow |
| 834 | |
| 835 | static const struct control_pins e100_modem_pins[NR_PORTS] = |
| 836 | { |
| 837 | /* Ser 0 */ |
| 838 | { |
| 839 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 840 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), |
| 841 | E100_STRUCT_MASK(0,DTR), |
| 842 | E100_STRUCT_MASK(0,RI), |
| 843 | E100_STRUCT_MASK(0,DSR), |
| 844 | E100_STRUCT_MASK(0,CD) |
| 845 | #else |
| 846 | CONTROL_PINS_PORT_NOT_USED(0) |
| 847 | #endif |
| 848 | }, |
| 849 | |
| 850 | /* Ser 1 */ |
| 851 | { |
| 852 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 853 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), |
| 854 | E100_STRUCT_MASK(1,DTR), |
| 855 | E100_STRUCT_MASK(1,RI), |
| 856 | E100_STRUCT_MASK(1,DSR), |
| 857 | E100_STRUCT_MASK(1,CD) |
| 858 | #else |
| 859 | CONTROL_PINS_PORT_NOT_USED(1) |
| 860 | #endif |
| 861 | }, |
| 862 | |
| 863 | /* Ser 2 */ |
| 864 | { |
| 865 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 866 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), |
| 867 | E100_STRUCT_MASK(2,DTR), |
| 868 | E100_STRUCT_MASK(2,RI), |
| 869 | E100_STRUCT_MASK(2,DSR), |
| 870 | E100_STRUCT_MASK(2,CD) |
| 871 | #else |
| 872 | CONTROL_PINS_PORT_NOT_USED(2) |
| 873 | #endif |
| 874 | }, |
| 875 | |
| 876 | /* Ser 3 */ |
| 877 | { |
| 878 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 879 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), |
| 880 | E100_STRUCT_MASK(3,DTR), |
| 881 | E100_STRUCT_MASK(3,RI), |
| 882 | E100_STRUCT_MASK(3,DSR), |
| 883 | E100_STRUCT_MASK(3,CD) |
| 884 | #else |
| 885 | CONTROL_PINS_PORT_NOT_USED(3) |
| 886 | #endif |
| 887 | } |
| 888 | }; |
Valentin Rothberg | 74a7608 | 2015-04-11 15:56:03 +0200 | [diff] [blame] | 889 | #endif /* !ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
| 891 | #define E100_RTS_MASK 0x20 |
| 892 | #define E100_CTS_MASK 0x40 |
| 893 | |
| 894 | /* All serial port signals are active low: |
| 895 | * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level |
| 896 | * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level |
| 897 | * |
| 898 | * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip |
| 899 | */ |
| 900 | |
| 901 | /* Output */ |
| 902 | #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK) |
| 903 | /* Input */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 904 | #define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */ |
| 907 | /* Is an output */ |
| 908 | #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask) |
| 909 | |
| 910 | /* Normally inputs */ |
| 911 | #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask) |
| 912 | #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask) |
| 913 | |
| 914 | /* Input */ |
| 915 | #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask) |
| 916 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | /* Calculate the chartime depending on baudrate, numbor of bits etc. */ |
| 918 | static void update_char_time(struct e100_serial * info) |
| 919 | { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 920 | tcflag_t cflags = info->port.tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | int bits; |
| 922 | |
| 923 | /* calc. number of bits / data byte */ |
| 924 | /* databits + startbit and 1 stopbit */ |
| 925 | if ((cflags & CSIZE) == CS7) |
| 926 | bits = 9; |
| 927 | else |
| 928 | bits = 10; |
| 929 | |
| 930 | if (cflags & CSTOPB) /* 2 stopbits ? */ |
| 931 | bits++; |
| 932 | |
| 933 | if (cflags & PARENB) /* parity bit ? */ |
| 934 | bits++; |
| 935 | |
| 936 | /* calc timeout */ |
| 937 | info->char_time_usec = ((bits * 1000000) / info->baud) + 1; |
| 938 | info->flush_time_usec = 4*info->char_time_usec; |
| 939 | if (info->flush_time_usec < MIN_FLUSH_TIME_USEC) |
| 940 | info->flush_time_usec = MIN_FLUSH_TIME_USEC; |
| 941 | |
| 942 | } |
| 943 | |
| 944 | /* |
| 945 | * This function maps from the Bxxxx defines in asm/termbits.h into real |
| 946 | * baud rates. |
| 947 | */ |
| 948 | |
| 949 | static int |
| 950 | cflag_to_baud(unsigned int cflag) |
| 951 | { |
| 952 | static int baud_table[] = { |
| 953 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, |
| 954 | 4800, 9600, 19200, 38400 }; |
| 955 | |
| 956 | static int ext_baud_table[] = { |
| 957 | 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000, |
| 958 | 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 959 | |
| 960 | if (cflag & CBAUDEX) |
| 961 | return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; |
| 962 | else |
| 963 | return baud_table[cflag & CBAUD]; |
| 964 | } |
| 965 | |
| 966 | /* and this maps to an etrax100 hardware baud constant */ |
| 967 | |
| 968 | static unsigned char |
| 969 | cflag_to_etrax_baud(unsigned int cflag) |
| 970 | { |
| 971 | char retval; |
| 972 | |
| 973 | static char baud_table[] = { |
| 974 | -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 }; |
| 975 | |
| 976 | static char ext_baud_table[] = { |
| 977 | -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 }; |
| 978 | |
| 979 | if (cflag & CBAUDEX) |
| 980 | retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; |
| 981 | else |
| 982 | retval = baud_table[cflag & CBAUD]; |
| 983 | |
| 984 | if (retval < 0) { |
| 985 | printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag); |
| 986 | retval = 5; /* choose default 9600 instead */ |
| 987 | } |
| 988 | |
| 989 | return retval | (retval << 4); /* choose same for both TX and RX */ |
| 990 | } |
| 991 | |
| 992 | |
| 993 | /* Various static support functions */ |
| 994 | |
| 995 | /* Functions to set or clear DTR/RTS on the requested line */ |
| 996 | /* It is complicated by the fact that RTS is a serial port register, while |
| 997 | * DTR might not be implemented in the HW at all, and if it is, it can be on |
| 998 | * any general port. |
| 999 | */ |
| 1000 | |
| 1001 | |
| 1002 | static inline void |
| 1003 | e100_dtr(struct e100_serial *info, int set) |
| 1004 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | unsigned char mask = e100_modem_pins[info->line].dtr_mask; |
| 1006 | |
| 1007 | #ifdef SERIAL_DEBUG_IO |
| 1008 | printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask); |
| 1009 | printk("ser%i shadow before 0x%02X get: %i\n", |
| 1010 | info->line, *e100_modem_pins[info->line].dtr_shadow, |
| 1011 | E100_DTR_GET(info)); |
| 1012 | #endif |
| 1013 | /* DTR is active low */ |
| 1014 | { |
| 1015 | unsigned long flags; |
| 1016 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1017 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | *e100_modem_pins[info->line].dtr_shadow &= ~mask; |
| 1019 | *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask); |
| 1020 | *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] | 1021 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | } |
| 1023 | |
| 1024 | #ifdef SERIAL_DEBUG_IO |
| 1025 | printk("ser%i shadow after 0x%02X get: %i\n", |
| 1026 | info->line, *e100_modem_pins[info->line].dtr_shadow, |
| 1027 | E100_DTR_GET(info)); |
| 1028 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
| 1031 | /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive |
| 1032 | * 0=0V , 1=3.3V |
| 1033 | */ |
| 1034 | static inline void |
| 1035 | e100_rts(struct e100_serial *info, int set) |
| 1036 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | unsigned long flags; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1038 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | info->rx_ctrl &= ~E100_RTS_MASK; |
| 1040 | info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1041 | info->ioport[REG_REC_CTRL] = info->rx_ctrl; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1042 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | #ifdef SERIAL_DEBUG_IO |
| 1044 | printk("ser%i rts %i\n", info->line, set); |
| 1045 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
| 1047 | |
| 1048 | |
| 1049 | /* If this behaves as a modem, RI and CD is an output */ |
| 1050 | static inline void |
| 1051 | e100_ri_out(struct e100_serial *info, int set) |
| 1052 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | /* RI is active low */ |
| 1054 | { |
| 1055 | unsigned char mask = e100_modem_pins[info->line].ri_mask; |
| 1056 | unsigned long flags; |
| 1057 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1058 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | *e100_modem_pins[info->line].ri_shadow &= ~mask; |
| 1060 | *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask); |
| 1061 | *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] | 1062 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | } |
| 1065 | static inline void |
| 1066 | e100_cd_out(struct e100_serial *info, int set) |
| 1067 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | /* CD is active low */ |
| 1069 | { |
| 1070 | unsigned char mask = e100_modem_pins[info->line].cd_mask; |
| 1071 | unsigned long flags; |
| 1072 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1073 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | *e100_modem_pins[info->line].cd_shadow &= ~mask; |
| 1075 | *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask); |
| 1076 | *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] | 1077 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | } |
| 1080 | |
| 1081 | static inline void |
| 1082 | e100_disable_rx(struct e100_serial *info) |
| 1083 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | /* disable the receiver */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1085 | info->ioport[REG_REC_CTRL] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | static inline void |
| 1090 | e100_enable_rx(struct e100_serial *info) |
| 1091 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | /* enable the receiver */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1093 | info->ioport[REG_REC_CTRL] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | } |
| 1096 | |
| 1097 | /* the rx DMA uses both the dma_descr and the dma_eop interrupts */ |
| 1098 | |
| 1099 | static inline void |
| 1100 | e100_disable_rxdma_irq(struct e100_serial *info) |
| 1101 | { |
| 1102 | #ifdef SERIAL_DEBUG_INTR |
| 1103 | printk("rxdma_irq(%d): 0\n",info->line); |
| 1104 | #endif |
| 1105 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line)); |
| 1106 | *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3); |
| 1107 | } |
| 1108 | |
| 1109 | static inline void |
| 1110 | e100_enable_rxdma_irq(struct e100_serial *info) |
| 1111 | { |
| 1112 | #ifdef SERIAL_DEBUG_INTR |
| 1113 | printk("rxdma_irq(%d): 1\n",info->line); |
| 1114 | #endif |
| 1115 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line)); |
| 1116 | *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3); |
| 1117 | } |
| 1118 | |
| 1119 | /* the tx DMA uses only dma_descr interrupt */ |
| 1120 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1121 | static void e100_disable_txdma_irq(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | { |
| 1123 | #ifdef SERIAL_DEBUG_INTR |
| 1124 | printk("txdma_irq(%d): 0\n",info->line); |
| 1125 | #endif |
| 1126 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line)); |
| 1127 | *R_IRQ_MASK2_CLR = info->irq; |
| 1128 | } |
| 1129 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1130 | static void e100_enable_txdma_irq(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | { |
| 1132 | #ifdef SERIAL_DEBUG_INTR |
| 1133 | printk("txdma_irq(%d): 1\n",info->line); |
| 1134 | #endif |
| 1135 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line)); |
| 1136 | *R_IRQ_MASK2_SET = info->irq; |
| 1137 | } |
| 1138 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1139 | static void e100_disable_txdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | { |
| 1141 | unsigned long flags; |
| 1142 | |
| 1143 | /* Disable output DMA channel for the serial port in question |
Frederik Schwarzer | 025dfda | 2008-10-16 19:02:37 +0200 | [diff] [blame] | 1144 | * ( set to something other than serialX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1146 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line)); |
| 1148 | if (info->line == 0) { |
| 1149 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) == |
| 1150 | IO_STATE(R_GEN_CONFIG, dma6, serial0)) { |
| 1151 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); |
| 1152 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused); |
| 1153 | } |
| 1154 | } else if (info->line == 1) { |
| 1155 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) == |
| 1156 | IO_STATE(R_GEN_CONFIG, dma8, serial1)) { |
| 1157 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); |
| 1158 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb); |
| 1159 | } |
| 1160 | } else if (info->line == 2) { |
| 1161 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) == |
| 1162 | IO_STATE(R_GEN_CONFIG, dma2, serial2)) { |
| 1163 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); |
| 1164 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0); |
| 1165 | } |
| 1166 | } else if (info->line == 3) { |
| 1167 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) == |
| 1168 | IO_STATE(R_GEN_CONFIG, dma4, serial3)) { |
| 1169 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); |
| 1170 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1); |
| 1171 | } |
| 1172 | } |
| 1173 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1174 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | } |
| 1176 | |
| 1177 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1178 | static void e100_enable_txdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | { |
| 1180 | unsigned long flags; |
| 1181 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1182 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line)); |
| 1184 | /* Enable output DMA channel for the serial port in question */ |
| 1185 | if (info->line == 0) { |
| 1186 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); |
| 1187 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0); |
| 1188 | } else if (info->line == 1) { |
| 1189 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); |
| 1190 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1); |
| 1191 | } else if (info->line == 2) { |
| 1192 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); |
| 1193 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2); |
| 1194 | } else if (info->line == 3) { |
| 1195 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); |
| 1196 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3); |
| 1197 | } |
| 1198 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1199 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | } |
| 1201 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1202 | static void e100_disable_rxdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | { |
| 1204 | unsigned long flags; |
| 1205 | |
| 1206 | /* Disable input DMA channel for the serial port in question |
Frederik Schwarzer | 025dfda | 2008-10-16 19:02:37 +0200 | [diff] [blame] | 1207 | * ( set to something other than serialX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1209 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | if (info->line == 0) { |
| 1211 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) == |
| 1212 | IO_STATE(R_GEN_CONFIG, dma7, serial0)) { |
| 1213 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); |
| 1214 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused); |
| 1215 | } |
| 1216 | } else if (info->line == 1) { |
| 1217 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) == |
| 1218 | IO_STATE(R_GEN_CONFIG, dma9, serial1)) { |
| 1219 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); |
| 1220 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb); |
| 1221 | } |
| 1222 | } else if (info->line == 2) { |
| 1223 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) == |
| 1224 | IO_STATE(R_GEN_CONFIG, dma3, serial2)) { |
| 1225 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); |
| 1226 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0); |
| 1227 | } |
| 1228 | } else if (info->line == 3) { |
| 1229 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) == |
| 1230 | IO_STATE(R_GEN_CONFIG, dma5, serial3)) { |
| 1231 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); |
| 1232 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1); |
| 1233 | } |
| 1234 | } |
| 1235 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1236 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | } |
| 1238 | |
| 1239 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1240 | static void e100_enable_rxdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | { |
| 1242 | unsigned long flags; |
| 1243 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1244 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | /* Enable input DMA channel for the serial port in question */ |
| 1246 | if (info->line == 0) { |
| 1247 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); |
| 1248 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0); |
| 1249 | } else if (info->line == 1) { |
| 1250 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); |
| 1251 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1); |
| 1252 | } else if (info->line == 2) { |
| 1253 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); |
| 1254 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2); |
| 1255 | } else if (info->line == 3) { |
| 1256 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); |
| 1257 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3); |
| 1258 | } |
| 1259 | *R_GEN_CONFIG = genconfig_shadow; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1260 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 1264 | /* in order to detect and fix errors on the first byte |
| 1265 | we have to use the serial interrupts as well. */ |
| 1266 | |
| 1267 | static inline void |
| 1268 | e100_disable_serial_data_irq(struct e100_serial *info) |
| 1269 | { |
| 1270 | #ifdef SERIAL_DEBUG_INTR |
| 1271 | printk("ser_irq(%d): 0\n",info->line); |
| 1272 | #endif |
| 1273 | DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line)); |
| 1274 | *R_IRQ_MASK1_CLR = (1U << (8+2*info->line)); |
| 1275 | } |
| 1276 | |
| 1277 | static inline void |
| 1278 | e100_enable_serial_data_irq(struct e100_serial *info) |
| 1279 | { |
| 1280 | #ifdef SERIAL_DEBUG_INTR |
| 1281 | printk("ser_irq(%d): 1\n",info->line); |
| 1282 | printk("**** %d = %d\n", |
| 1283 | (8+2*info->line), |
| 1284 | (1U << (8+2*info->line))); |
| 1285 | #endif |
| 1286 | DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line)); |
| 1287 | *R_IRQ_MASK1_SET = (1U << (8+2*info->line)); |
| 1288 | } |
| 1289 | #endif |
| 1290 | |
| 1291 | static inline void |
| 1292 | e100_disable_serial_tx_ready_irq(struct e100_serial *info) |
| 1293 | { |
| 1294 | #ifdef SERIAL_DEBUG_INTR |
| 1295 | printk("ser_tx_irq(%d): 0\n",info->line); |
| 1296 | #endif |
| 1297 | DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line)); |
| 1298 | *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line)); |
| 1299 | } |
| 1300 | |
| 1301 | static inline void |
| 1302 | e100_enable_serial_tx_ready_irq(struct e100_serial *info) |
| 1303 | { |
| 1304 | #ifdef SERIAL_DEBUG_INTR |
| 1305 | printk("ser_tx_irq(%d): 1\n",info->line); |
| 1306 | printk("**** %d = %d\n", |
| 1307 | (8+1+2*info->line), |
| 1308 | (1U << (8+1+2*info->line))); |
| 1309 | #endif |
| 1310 | DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line)); |
| 1311 | *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line)); |
| 1312 | } |
| 1313 | |
| 1314 | static inline void e100_enable_rx_irq(struct e100_serial *info) |
| 1315 | { |
| 1316 | if (info->uses_dma_in) |
| 1317 | e100_enable_rxdma_irq(info); |
| 1318 | else |
| 1319 | e100_enable_serial_data_irq(info); |
| 1320 | } |
| 1321 | static inline void e100_disable_rx_irq(struct e100_serial *info) |
| 1322 | { |
| 1323 | if (info->uses_dma_in) |
| 1324 | e100_disable_rxdma_irq(info); |
| 1325 | else |
| 1326 | e100_disable_serial_data_irq(info); |
| 1327 | } |
| 1328 | |
| 1329 | #if defined(CONFIG_ETRAX_RS485) |
| 1330 | /* Enable RS-485 mode on selected port. This is UGLY. */ |
| 1331 | static int |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1332 | e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | { |
| 1334 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 1335 | |
| 1336 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 1337 | *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit); |
| 1338 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
Jesper Nilsson | c7213fc | 2010-10-28 12:08:27 +0200 | [diff] [blame] | 1340 | info->rs485 = *r; |
| 1341 | |
| 1342 | /* Maximum delay before RTS equal to 1000 */ |
| 1343 | if (info->rs485.delay_rts_before_send >= 1000) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | info->rs485.delay_rts_before_send = 1000; |
Jesper Nilsson | c7213fc | 2010-10-28 12:08:27 +0200 | [diff] [blame] | 1345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | /* printk("rts: on send = %i, after = %i, enabled = %i", |
| 1347 | info->rs485.rts_on_send, |
| 1348 | info->rs485.rts_after_sent, |
| 1349 | info->rs485.enabled |
| 1350 | ); |
| 1351 | */ |
| 1352 | return 0; |
| 1353 | } |
| 1354 | |
| 1355 | static int |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1356 | e100_write_rs485(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | const unsigned char *buf, int count) |
| 1358 | { |
| 1359 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1360 | int old_value = (info->rs485.flags) & SER_RS485_ENABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
| 1362 | /* rs485 is always implicitly enabled if we're using the ioctl() |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1363 | * but it doesn't have to be set in the serial_rs485 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | * (to be backward compatible with old apps) |
| 1365 | * So we store, set and restore it. |
| 1366 | */ |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1367 | info->rs485.flags |= SER_RS485_ENABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | /* rs_write now deals with RS485 if enabled */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1369 | count = rs_write(tty, buf, count); |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1370 | if (!old_value) |
| 1371 | info->rs485.flags &= ~(SER_RS485_ENABLED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | return count; |
| 1373 | } |
| 1374 | |
| 1375 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 1376 | /* Timer function to toggle RTS when using FAST_TIMER */ |
| 1377 | static void rs485_toggle_rts_timer_function(unsigned long data) |
| 1378 | { |
| 1379 | struct e100_serial *info = (struct e100_serial *)data; |
| 1380 | |
| 1381 | fast_timers_rs485[info->line].function = NULL; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1382 | e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 1384 | e100_enable_rx(info); |
| 1385 | e100_enable_rx_irq(info); |
| 1386 | #endif |
| 1387 | } |
| 1388 | #endif |
| 1389 | #endif /* CONFIG_ETRAX_RS485 */ |
| 1390 | |
| 1391 | /* |
| 1392 | * ------------------------------------------------------------ |
| 1393 | * rs_stop() and rs_start() |
| 1394 | * |
| 1395 | * This routines are called before setting or resetting tty->stopped. |
| 1396 | * They enable or disable transmitter using the XOFF registers, as necessary. |
| 1397 | * ------------------------------------------------------------ |
| 1398 | */ |
| 1399 | |
| 1400 | static void |
| 1401 | rs_stop(struct tty_struct *tty) |
| 1402 | { |
| 1403 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 1404 | if (info) { |
| 1405 | unsigned long flags; |
| 1406 | unsigned long xoff; |
| 1407 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1408 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n", |
| 1410 | CIRC_CNT(info->xmit.head, |
| 1411 | info->xmit.tail,SERIAL_XMIT_SIZE))); |
| 1412 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1413 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, |
| 1414 | STOP_CHAR(info->port.tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop); |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1416 | if (tty->termios.c_iflag & IXON ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 1418 | } |
| 1419 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1420 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1421 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | } |
| 1423 | } |
| 1424 | |
| 1425 | static void |
| 1426 | rs_start(struct tty_struct *tty) |
| 1427 | { |
| 1428 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 1429 | if (info) { |
| 1430 | unsigned long flags; |
| 1431 | unsigned long xoff; |
| 1432 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1433 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n", |
| 1435 | CIRC_CNT(info->xmit.head, |
| 1436 | info->xmit.tail,SERIAL_XMIT_SIZE))); |
| 1437 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty)); |
| 1438 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1439 | if (tty->termios.c_iflag & IXON ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 1441 | } |
| 1442 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1443 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | if (!info->uses_dma_out && |
| 1445 | info->xmit.head != info->xmit.tail && info->xmit.buf) |
| 1446 | e100_enable_serial_tx_ready_irq(info); |
| 1447 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1448 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | } |
| 1450 | } |
| 1451 | |
| 1452 | /* |
| 1453 | * ---------------------------------------------------------------------- |
| 1454 | * |
| 1455 | * Here starts the interrupt handling routines. All of the following |
| 1456 | * subroutines are declared as inline and are folded into |
| 1457 | * rs_interrupt(). They were separated out for readability's sake. |
| 1458 | * |
| 1459 | * Note: rs_interrupt() is a "fast" interrupt, which means that it |
| 1460 | * runs with interrupts turned off. People who may want to modify |
| 1461 | * rs_interrupt() should try to keep the interrupt handler as fast as |
| 1462 | * possible. After you are done making modifications, it is not a bad |
| 1463 | * idea to do: |
| 1464 | * |
| 1465 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c |
| 1466 | * |
| 1467 | * and look at the resulting assemble code in serial.s. |
| 1468 | * |
| 1469 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 |
| 1470 | * ----------------------------------------------------------------------- |
| 1471 | */ |
| 1472 | |
| 1473 | /* |
| 1474 | * This routine is used by the interrupt handler to schedule |
| 1475 | * processing in the software interrupt portion of the driver. |
| 1476 | */ |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1477 | static void rs_sched_event(struct e100_serial *info, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | { |
| 1479 | if (info->event & (1 << event)) |
| 1480 | return; |
| 1481 | info->event |= 1 << event; |
| 1482 | schedule_work(&info->work); |
| 1483 | } |
| 1484 | |
| 1485 | /* The output DMA channel is free - use it to send as many chars as possible |
| 1486 | * NOTES: |
| 1487 | * We don't pay attention to info->x_char, which means if the TTY wants to |
| 1488 | * use XON/XOFF it will set info->x_char but we won't send any X char! |
| 1489 | * |
| 1490 | * To implement this, we'd just start a DMA send of 1 byte pointing at a |
| 1491 | * buffer containing the X char, and skip updating xmit. We'd also have to |
| 1492 | * check if the last sent char was the X char when we enter this function |
| 1493 | * the next time, to avoid updating xmit with the sent X value. |
| 1494 | */ |
| 1495 | |
| 1496 | static void |
| 1497 | transmit_chars_dma(struct e100_serial *info) |
| 1498 | { |
| 1499 | unsigned int c, sentl; |
| 1500 | struct etrax_dma_descr *descr; |
| 1501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ |
| 1503 | *info->oclrintradr = |
| 1504 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 1505 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 1506 | |
| 1507 | #ifdef SERIAL_DEBUG_INTR |
| 1508 | if (info->line == SERIAL_DEBUG_LINE) |
| 1509 | printk("tc\n"); |
| 1510 | #endif |
| 1511 | if (!info->tr_running) { |
| 1512 | /* weirdo... we shouldn't get here! */ |
| 1513 | printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n"); |
| 1514 | return; |
| 1515 | } |
| 1516 | |
| 1517 | descr = &info->tr_descr; |
| 1518 | |
| 1519 | /* first get the amount of bytes sent during the last DMA transfer, |
| 1520 | and update xmit accordingly */ |
| 1521 | |
| 1522 | /* if the stop bit was not set, all data has been sent */ |
| 1523 | if (!(descr->status & d_stop)) { |
| 1524 | sentl = descr->sw_len; |
| 1525 | } else |
| 1526 | /* otherwise we find the amount of data sent here */ |
| 1527 | sentl = descr->hw_len; |
| 1528 | |
| 1529 | DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl)); |
| 1530 | |
| 1531 | /* update stats */ |
| 1532 | info->icount.tx += sentl; |
| 1533 | |
| 1534 | /* update xmit buffer */ |
| 1535 | info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1); |
| 1536 | |
| 1537 | /* if there is only a few chars left in the buf, wake up the blocked |
| 1538 | write if any */ |
| 1539 | if (CIRC_CNT(info->xmit.head, |
| 1540 | info->xmit.tail, |
| 1541 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 1542 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 1543 | |
| 1544 | /* find out the largest amount of consecutive bytes we want to send now */ |
| 1545 | |
| 1546 | c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 1547 | |
| 1548 | /* Don't send all in one DMA transfer - divide it so we wake up |
| 1549 | * application before all is sent |
| 1550 | */ |
| 1551 | |
| 1552 | if (c >= 4*WAKEUP_CHARS) |
| 1553 | c = c/2; |
| 1554 | |
| 1555 | if (c <= 0) { |
| 1556 | /* our job here is done, don't schedule any new DMA transfer */ |
| 1557 | info->tr_running = 0; |
| 1558 | |
| 1559 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 1560 | if (info->rs485.flags & SER_RS485_ENABLED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | /* Set a short timer to toggle RTS */ |
| 1562 | start_one_shot_timer(&fast_timers_rs485[info->line], |
| 1563 | rs485_toggle_rts_timer_function, |
| 1564 | (unsigned long)info, |
| 1565 | info->char_time_usec*2, |
| 1566 | "RS-485"); |
| 1567 | } |
| 1568 | #endif /* RS485 */ |
| 1569 | return; |
| 1570 | } |
| 1571 | |
| 1572 | /* ok we can schedule a dma send of c chars starting at info->xmit.tail */ |
| 1573 | /* set up the descriptor correctly for output */ |
| 1574 | DFLOW(DEBUG_LOG(info->line, "TX %i\n", c)); |
| 1575 | descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */ |
| 1576 | descr->sw_len = c; |
| 1577 | descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail); |
| 1578 | descr->status = 0; |
| 1579 | |
| 1580 | *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */ |
| 1581 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); |
| 1582 | |
| 1583 | /* DMA is now running (hopefully) */ |
| 1584 | } /* transmit_chars_dma */ |
| 1585 | |
| 1586 | static void |
| 1587 | start_transmit(struct e100_serial *info) |
| 1588 | { |
| 1589 | #if 0 |
| 1590 | if (info->line == SERIAL_DEBUG_LINE) |
| 1591 | printk("x\n"); |
| 1592 | #endif |
| 1593 | |
| 1594 | info->tr_descr.sw_len = 0; |
| 1595 | info->tr_descr.hw_len = 0; |
| 1596 | info->tr_descr.status = 0; |
| 1597 | info->tr_running = 1; |
| 1598 | if (info->uses_dma_out) |
| 1599 | transmit_chars_dma(info); |
| 1600 | else |
| 1601 | e100_enable_serial_tx_ready_irq(info); |
| 1602 | } /* start_transmit */ |
| 1603 | |
| 1604 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 1605 | static int serial_fast_timer_started = 0; |
| 1606 | static int serial_fast_timer_expired = 0; |
| 1607 | static void flush_timeout_function(unsigned long data); |
| 1608 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\ |
| 1609 | unsigned long timer_flags; \ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1610 | local_irq_save(timer_flags); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | if (fast_timers[info->line].function == NULL) { \ |
| 1612 | serial_fast_timer_started++; \ |
| 1613 | TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \ |
| 1614 | TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \ |
| 1615 | start_one_shot_timer(&fast_timers[info->line], \ |
| 1616 | flush_timeout_function, \ |
| 1617 | (unsigned long)info, \ |
| 1618 | (usec), \ |
| 1619 | string); \ |
| 1620 | } \ |
| 1621 | else { \ |
| 1622 | TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \ |
| 1623 | } \ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1624 | local_irq_restore(timer_flags); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | } |
| 1626 | #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec) |
| 1627 | |
| 1628 | #else |
| 1629 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) |
| 1630 | #define START_FLUSH_FAST_TIMER(info, string) |
| 1631 | #endif |
| 1632 | |
| 1633 | static struct etrax_recv_buffer * |
| 1634 | alloc_recv_buffer(unsigned int size) |
| 1635 | { |
| 1636 | struct etrax_recv_buffer *buffer; |
| 1637 | |
Greg Kroah-Hartman | 9ff4604 | 2015-04-30 11:22:07 +0200 | [diff] [blame^] | 1638 | buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC); |
| 1639 | if (!buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | return NULL; |
| 1641 | |
| 1642 | buffer->next = NULL; |
| 1643 | buffer->length = 0; |
| 1644 | buffer->error = TTY_NORMAL; |
| 1645 | |
| 1646 | return buffer; |
| 1647 | } |
| 1648 | |
| 1649 | static void |
| 1650 | append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer) |
| 1651 | { |
| 1652 | unsigned long flags; |
| 1653 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1654 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
| 1656 | if (!info->first_recv_buffer) |
| 1657 | info->first_recv_buffer = buffer; |
| 1658 | else |
| 1659 | info->last_recv_buffer->next = buffer; |
| 1660 | |
| 1661 | info->last_recv_buffer = buffer; |
| 1662 | |
| 1663 | info->recv_cnt += buffer->length; |
| 1664 | if (info->recv_cnt > info->max_recv_cnt) |
| 1665 | info->max_recv_cnt = info->recv_cnt; |
| 1666 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1667 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | } |
| 1669 | |
| 1670 | static int |
| 1671 | add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag) |
| 1672 | { |
| 1673 | struct etrax_recv_buffer *buffer; |
| 1674 | if (info->uses_dma_in) { |
Greg Kroah-Hartman | 9ff4604 | 2015-04-30 11:22:07 +0200 | [diff] [blame^] | 1675 | buffer = alloc_recv_buffer(4); |
| 1676 | if (!buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | return 0; |
| 1678 | |
| 1679 | buffer->length = 1; |
| 1680 | buffer->error = flag; |
| 1681 | buffer->buffer[0] = data; |
| 1682 | |
| 1683 | append_recv_buffer(info, buffer); |
| 1684 | |
| 1685 | info->icount.rx++; |
| 1686 | } else { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 1687 | tty_insert_flip_char(&info->port, data, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | info->icount.rx++; |
| 1689 | } |
| 1690 | |
| 1691 | return 1; |
| 1692 | } |
| 1693 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1694 | static unsigned int handle_descr_data(struct e100_serial *info, |
| 1695 | struct etrax_dma_descr *descr, |
| 1696 | unsigned int recvl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | { |
| 1698 | struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer; |
| 1699 | |
| 1700 | if (info->recv_cnt + recvl > 65536) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 1701 | printk(KERN_WARNING |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1702 | "%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] | 1703 | return 0; |
| 1704 | } |
| 1705 | |
| 1706 | buffer->length = recvl; |
| 1707 | |
| 1708 | if (info->errorcode == ERRCODE_SET_BREAK) |
| 1709 | buffer->error = TTY_BREAK; |
| 1710 | info->errorcode = 0; |
| 1711 | |
| 1712 | append_recv_buffer(info, buffer); |
| 1713 | |
Greg Kroah-Hartman | 9ff4604 | 2015-04-30 11:22:07 +0200 | [diff] [blame^] | 1714 | buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE); |
| 1715 | if (!buffer) |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1716 | panic("%s: Failed to allocate memory for receive buffer!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
| 1718 | descr->buf = virt_to_phys(buffer->buffer); |
| 1719 | |
| 1720 | return recvl; |
| 1721 | } |
| 1722 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1723 | static unsigned int handle_all_descr_data(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | { |
| 1725 | struct etrax_dma_descr *descr; |
| 1726 | unsigned int recvl; |
| 1727 | unsigned int ret = 0; |
| 1728 | |
| 1729 | while (1) |
| 1730 | { |
| 1731 | descr = &info->rec_descr[info->cur_rec_descr]; |
| 1732 | |
| 1733 | if (descr == phys_to_virt(*info->idescradr)) |
| 1734 | break; |
| 1735 | |
| 1736 | if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS) |
| 1737 | info->cur_rec_descr = 0; |
| 1738 | |
| 1739 | /* find out how many bytes were read */ |
| 1740 | |
| 1741 | /* if the eop bit was not set, all data has been received */ |
| 1742 | if (!(descr->status & d_eop)) { |
| 1743 | recvl = descr->sw_len; |
| 1744 | } else { |
| 1745 | /* otherwise we find the amount of data received here */ |
| 1746 | recvl = descr->hw_len; |
| 1747 | } |
| 1748 | |
| 1749 | /* Reset the status information */ |
| 1750 | descr->status = 0; |
| 1751 | |
| 1752 | DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl); |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1753 | if (info->port.tty->stopped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | unsigned char *buf = phys_to_virt(descr->buf); |
| 1755 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]); |
| 1756 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]); |
| 1757 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]); |
| 1758 | } |
| 1759 | ); |
| 1760 | |
| 1761 | /* update stats */ |
| 1762 | info->icount.rx += recvl; |
| 1763 | |
| 1764 | ret += handle_descr_data(info, descr, recvl); |
| 1765 | } |
| 1766 | |
| 1767 | return ret; |
| 1768 | } |
| 1769 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1770 | static void receive_chars_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | { |
| 1772 | struct tty_struct *tty; |
| 1773 | unsigned char rstat; |
| 1774 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ |
| 1776 | *info->iclrintradr = |
| 1777 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 1778 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 1779 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 1780 | tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | if (!tty) /* Something wrong... */ |
| 1782 | return; |
| 1783 | |
| 1784 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 1785 | if (info->uses_dma_in) |
| 1786 | e100_enable_serial_data_irq(info); |
| 1787 | #endif |
| 1788 | |
| 1789 | if (info->errorcode == ERRCODE_INSERT_BREAK) |
| 1790 | add_char_and_flag(info, '\0', TTY_BREAK); |
| 1791 | |
| 1792 | handle_all_descr_data(info); |
| 1793 | |
| 1794 | /* Read the status register to detect errors */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1795 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
| 1797 | DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat)); |
| 1798 | } |
| 1799 | |
| 1800 | if (rstat & SER_ERROR_MASK) { |
| 1801 | /* If we got an error, we must reset it by reading the |
| 1802 | * data_in field |
| 1803 | */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1804 | unsigned char data = info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n", |
| 1807 | ((rstat & SER_ERROR_MASK) << 8) | data); |
| 1808 | |
| 1809 | if (rstat & SER_PAR_ERR_MASK) |
| 1810 | add_char_and_flag(info, data, TTY_PARITY); |
| 1811 | else if (rstat & SER_OVERRUN_MASK) |
| 1812 | add_char_and_flag(info, data, TTY_OVERRUN); |
| 1813 | else if (rstat & SER_FRAMING_ERR_MASK) |
| 1814 | add_char_and_flag(info, data, TTY_FRAME); |
| 1815 | } |
| 1816 | |
| 1817 | START_FLUSH_FAST_TIMER(info, "receive_chars"); |
| 1818 | |
| 1819 | /* Restart the receiving DMA */ |
| 1820 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); |
| 1821 | } |
| 1822 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1823 | static int start_recv_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | { |
| 1825 | struct etrax_dma_descr *descr = info->rec_descr; |
| 1826 | struct etrax_recv_buffer *buffer; |
| 1827 | int i; |
| 1828 | |
| 1829 | /* Set up the receiving descriptors */ |
| 1830 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) { |
Greg Kroah-Hartman | 9ff4604 | 2015-04-30 11:22:07 +0200 | [diff] [blame^] | 1831 | buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE); |
| 1832 | if (!buffer) |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1833 | panic("%s: Failed to allocate memory for receive buffer!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | |
| 1835 | descr[i].ctrl = d_int; |
| 1836 | descr[i].buf = virt_to_phys(buffer->buffer); |
| 1837 | descr[i].sw_len = SERIAL_DESCR_BUF_SIZE; |
| 1838 | descr[i].hw_len = 0; |
| 1839 | descr[i].status = 0; |
| 1840 | descr[i].next = virt_to_phys(&descr[i+1]); |
| 1841 | } |
| 1842 | |
| 1843 | /* Link the last descriptor to the first */ |
| 1844 | descr[i-1].next = virt_to_phys(&descr[0]); |
| 1845 | |
| 1846 | /* Start with the first descriptor in the list */ |
| 1847 | info->cur_rec_descr = 0; |
| 1848 | |
| 1849 | /* Start the DMA */ |
| 1850 | *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]); |
| 1851 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); |
| 1852 | |
| 1853 | /* Input DMA should be running now */ |
| 1854 | return 1; |
| 1855 | } |
| 1856 | |
| 1857 | static void |
| 1858 | start_receive(struct e100_serial *info) |
| 1859 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | if (info->uses_dma_in) { |
| 1861 | /* reset the input dma channel to be sure it works */ |
| 1862 | |
| 1863 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 1864 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == |
| 1865 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 1866 | |
| 1867 | start_recv_dma(info); |
| 1868 | } |
| 1869 | } |
| 1870 | |
| 1871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | /* the bits in the MASK2 register are laid out like this: |
| 1873 | DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR |
| 1874 | where I is the input channel and O is the output channel for the port. |
| 1875 | info->irq is the bit number for the DMAO_DESCR so to check the others we |
| 1876 | shift info->irq to the left. |
| 1877 | */ |
| 1878 | |
| 1879 | /* dma output channel interrupt handler |
| 1880 | this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or |
| 1881 | DMA8(ser1) when they have finished a descriptor with the intr flag set. |
| 1882 | */ |
| 1883 | |
| 1884 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1885 | tr_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | { |
| 1887 | struct e100_serial *info; |
| 1888 | unsigned long ireg; |
| 1889 | int i; |
| 1890 | int handled = 0; |
| 1891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | /* find out the line that caused this irq and get it from rs_table */ |
| 1893 | |
| 1894 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ |
| 1895 | |
| 1896 | for (i = 0; i < NR_PORTS; i++) { |
| 1897 | info = rs_table + i; |
| 1898 | if (!info->enabled || !info->uses_dma_out) |
| 1899 | continue; |
| 1900 | /* check for dma_descr (don't need to check for dma_eop in output dma for serial */ |
| 1901 | if (ireg & info->irq) { |
| 1902 | handled = 1; |
| 1903 | /* we can send a new dma bunch. make it so. */ |
| 1904 | DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i)); |
| 1905 | /* Read jiffies_usec first, |
| 1906 | * we want this time to be as late as possible |
| 1907 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | info->last_tx_active_usec = GET_JIFFIES_USEC(); |
| 1909 | info->last_tx_active = jiffies; |
| 1910 | transmit_chars_dma(info); |
| 1911 | } |
| 1912 | |
| 1913 | /* FIXME: here we should really check for a change in the |
| 1914 | status lines and if so call status_handle(info) */ |
| 1915 | } |
| 1916 | return IRQ_RETVAL(handled); |
| 1917 | } /* tr_interrupt */ |
| 1918 | |
| 1919 | /* dma input channel interrupt handler */ |
| 1920 | |
| 1921 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1922 | rec_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | { |
| 1924 | struct e100_serial *info; |
| 1925 | unsigned long ireg; |
| 1926 | int i; |
| 1927 | int handled = 0; |
| 1928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | /* find out the line that caused this irq and get it from rs_table */ |
| 1930 | |
| 1931 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ |
| 1932 | |
| 1933 | for (i = 0; i < NR_PORTS; i++) { |
| 1934 | info = rs_table + i; |
| 1935 | if (!info->enabled || !info->uses_dma_in) |
| 1936 | continue; |
| 1937 | /* check for both dma_eop and dma_descr for the input dma channel */ |
| 1938 | if (ireg & ((info->irq << 2) | (info->irq << 3))) { |
| 1939 | handled = 1; |
| 1940 | /* we have received something */ |
| 1941 | receive_chars_dma(info); |
| 1942 | } |
| 1943 | |
| 1944 | /* FIXME: here we should really check for a change in the |
| 1945 | status lines and if so call status_handle(info) */ |
| 1946 | } |
| 1947 | return IRQ_RETVAL(handled); |
| 1948 | } /* rec_interrupt */ |
| 1949 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1950 | static int force_eop_if_needed(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | { |
| 1952 | /* We check data_avail bit to determine if data has |
| 1953 | * arrived since last time |
| 1954 | */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1955 | unsigned char rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | |
| 1957 | /* error or datavail? */ |
| 1958 | if (rstat & SER_ERROR_MASK) { |
| 1959 | /* Some error has occurred. If there has been valid data, an |
| 1960 | * EOP interrupt will be made automatically. If no data, the |
| 1961 | * normal ser_interrupt should be enabled and handle it. |
| 1962 | * So do nothing! |
| 1963 | */ |
| 1964 | DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n", |
| 1965 | rstat | (info->line << 8)); |
| 1966 | return 0; |
| 1967 | } |
| 1968 | |
| 1969 | if (rstat & SER_DATA_AVAIL_MASK) { |
| 1970 | /* Ok data, no error, count it */ |
| 1971 | TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n", |
| 1972 | rstat | (info->line << 8))); |
| 1973 | /* Read data to clear status flags */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 1974 | (void)info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | |
| 1976 | info->forced_eop = 0; |
| 1977 | START_FLUSH_FAST_TIMER(info, "magic"); |
| 1978 | return 0; |
| 1979 | } |
| 1980 | |
| 1981 | /* hit the timeout, force an EOP for the input |
| 1982 | * dma channel if we haven't already |
| 1983 | */ |
| 1984 | if (!info->forced_eop) { |
| 1985 | info->forced_eop = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line)); |
| 1987 | FORCE_EOP(info); |
| 1988 | } |
| 1989 | |
| 1990 | return 1; |
| 1991 | } |
| 1992 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1993 | static void flush_to_flip_buffer(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | struct etrax_recv_buffer *buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 1998 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
Alan Cox | 2090ab0 | 2007-10-16 01:26:38 -0700 | [diff] [blame] | 2000 | while ((buffer = info->first_recv_buffer) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | unsigned int count = buffer->length; |
| 2002 | |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 2003 | tty_insert_flip_string(&info->port, buffer->buffer, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | info->recv_cnt -= count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
| 2006 | if (count == buffer->length) { |
| 2007 | info->first_recv_buffer = buffer->next; |
| 2008 | kfree(buffer); |
| 2009 | } else { |
| 2010 | buffer->length -= count; |
| 2011 | memmove(buffer->buffer, buffer->buffer + count, buffer->length); |
| 2012 | buffer->error = TTY_NORMAL; |
| 2013 | } |
| 2014 | } |
| 2015 | |
| 2016 | if (!info->first_recv_buffer) |
| 2017 | info->last_recv_buffer = NULL; |
| 2018 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2019 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2021 | /* This includes a check for low-latency */ |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 2022 | tty_flip_buffer_push(&info->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | } |
| 2024 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2025 | static void check_flush_timeout(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | { |
| 2027 | /* Flip what we've got (if we can) */ |
| 2028 | flush_to_flip_buffer(info); |
| 2029 | |
| 2030 | /* We might need to flip later, but not to fast |
| 2031 | * since the system is busy processing input... */ |
| 2032 | if (info->first_recv_buffer) |
| 2033 | START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000); |
| 2034 | |
| 2035 | /* Force eop last, since data might have come while we're processing |
| 2036 | * and if we started the slow timer above, we won't start a fast |
| 2037 | * below. |
| 2038 | */ |
| 2039 | force_eop_if_needed(info); |
| 2040 | } |
| 2041 | |
| 2042 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 2043 | static void flush_timeout_function(unsigned long data) |
| 2044 | { |
| 2045 | struct e100_serial *info = (struct e100_serial *)data; |
| 2046 | |
| 2047 | fast_timers[info->line].function = NULL; |
| 2048 | serial_fast_timer_expired++; |
Masanari Iida | 8faaaea | 2014-01-07 21:58:06 +0900 | [diff] [blame] | 2049 | TIMERD(DEBUG_LOG(info->line, "flush_timeout %i ", info->line)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired)); |
| 2051 | check_flush_timeout(info); |
| 2052 | } |
| 2053 | |
| 2054 | #else |
| 2055 | |
| 2056 | /* dma fifo/buffer timeout handler |
| 2057 | forces an end-of-packet for the dma input channel if no chars |
| 2058 | have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s. |
| 2059 | */ |
| 2060 | |
| 2061 | static struct timer_list flush_timer; |
| 2062 | |
| 2063 | static void |
| 2064 | timed_flush_handler(unsigned long ptr) |
| 2065 | { |
| 2066 | struct e100_serial *info; |
| 2067 | int i; |
| 2068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | for (i = 0; i < NR_PORTS; i++) { |
| 2070 | info = rs_table + i; |
| 2071 | if (info->uses_dma_in) |
| 2072 | check_flush_timeout(info); |
| 2073 | } |
| 2074 | |
| 2075 | /* restart flush timer */ |
| 2076 | mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS); |
| 2077 | } |
| 2078 | #endif |
| 2079 | |
| 2080 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 2081 | |
| 2082 | /* If there is an error (ie break) when the DMA is running and |
| 2083 | * there are no bytes in the fifo the DMA is stopped and we get no |
| 2084 | * eop interrupt. Thus we have to monitor the first bytes on a DMA |
| 2085 | * transfer, and if it is without error we can turn the serial |
| 2086 | * interrupts off. |
| 2087 | */ |
| 2088 | |
| 2089 | /* |
| 2090 | BREAK handling on ETRAX 100: |
| 2091 | ETRAX will generate interrupt although there is no stop bit between the |
| 2092 | characters. |
| 2093 | |
| 2094 | Depending on how long the break sequence is, the end of the breaksequence |
| 2095 | will look differently: |
| 2096 | | indicates start/end of a character. |
| 2097 | |
| 2098 | B= Break character (0x00) with framing error. |
| 2099 | E= Error byte with parity error received after B characters. |
| 2100 | F= "Faked" valid byte received immediately after B characters. |
| 2101 | V= Valid byte |
| 2102 | |
| 2103 | 1. |
| 2104 | B BL ___________________________ V |
| 2105 | .._|__________|__________| |valid data | |
| 2106 | |
| 2107 | Multiple frame errors with data == 0x00 (B), |
| 2108 | the timing matches up "perfectly" so no extra ending char is detected. |
| 2109 | The RXD pin is 1 in the last interrupt, in that case |
| 2110 | we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really |
| 2111 | know if another byte will come and this really is case 2. below |
| 2112 | (e.g F=0xFF or 0xFE) |
| 2113 | If RXD pin is 0 we can expect another character (see 2. below). |
| 2114 | |
| 2115 | |
| 2116 | 2. |
| 2117 | |
| 2118 | B B E or F__________________..__ V |
| 2119 | .._|__________|__________|______ | |valid data |
| 2120 | "valid" or |
| 2121 | parity error |
| 2122 | |
| 2123 | Multiple frame errors with data == 0x00 (B), |
| 2124 | but the part of the break trigs is interpreted as a start bit (and possibly |
| 2125 | some 0 bits followed by a number of 1 bits and a stop bit). |
| 2126 | Depending on parity settings etc. this last character can be either |
| 2127 | a fake "valid" char (F) or have a parity error (E). |
| 2128 | |
| 2129 | If the character is valid it will be put in the buffer, |
| 2130 | we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt |
| 2131 | will set the flags so the tty will handle it, |
| 2132 | if it's an error byte it will not be put in the buffer |
| 2133 | and we set info->errorcode = ERRCODE_INSERT_BREAK. |
| 2134 | |
| 2135 | To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp |
| 2136 | of the last faulty char (B) and compares it with the current time: |
| 2137 | If the time elapsed time is less then 2*char_time_usec we will assume |
| 2138 | it's a faked F char and not a Valid char and set |
| 2139 | info->errorcode = ERRCODE_SET_BREAK. |
| 2140 | |
| 2141 | Flaws in the above solution: |
| 2142 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 2143 | We use the timer to distinguish a F character from a V character, |
| 2144 | if a V character is to close after the break we might make the wrong decision. |
| 2145 | |
| 2146 | TODO: The break will be delayed until an F or V character is received. |
| 2147 | |
| 2148 | */ |
| 2149 | |
Jiri Slaby | 12aad55 | 2013-03-07 13:12:35 +0100 | [diff] [blame] | 2150 | static void handle_ser_rx_interrupt_no_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | { |
| 2152 | unsigned long data_read; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | /* Read data and status at the same time */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2155 | data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | more_data: |
| 2157 | if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) { |
| 2158 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); |
| 2159 | } |
| 2160 | DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read))); |
| 2161 | |
| 2162 | if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) | |
| 2163 | IO_MASK(R_SERIAL0_READ, par_err) | |
| 2164 | IO_MASK(R_SERIAL0_READ, overrun) )) { |
| 2165 | /* An error */ |
| 2166 | info->last_rx_active_usec = GET_JIFFIES_USEC(); |
| 2167 | info->last_rx_active = jiffies; |
| 2168 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read)); |
| 2169 | DLOG_INT_TRIG( |
| 2170 | if (!log_int_trig1_pos) { |
| 2171 | log_int_trig1_pos = log_int_pos; |
| 2172 | log_int(rdpc(), 0, 0); |
| 2173 | } |
| 2174 | ); |
| 2175 | |
| 2176 | |
| 2177 | if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) && |
| 2178 | (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) { |
| 2179 | /* Most likely a break, but we get interrupts over and |
| 2180 | * over again. |
| 2181 | */ |
| 2182 | |
| 2183 | if (!info->break_detected_cnt) { |
| 2184 | DEBUG_LOG(info->line, "#BRK start\n", 0); |
| 2185 | } |
| 2186 | if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) { |
| 2187 | /* The RX pin is high now, so the break |
| 2188 | * must be over, but.... |
| 2189 | * we can't really know if we will get another |
| 2190 | * last byte ending the break or not. |
| 2191 | * And we don't know if the byte (if any) will |
| 2192 | * have an error or look valid. |
| 2193 | */ |
| 2194 | DEBUG_LOG(info->line, "# BL BRK\n", 0); |
| 2195 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2196 | } |
| 2197 | info->break_detected_cnt++; |
| 2198 | } else { |
| 2199 | /* The error does not look like a break, but could be |
| 2200 | * the end of one |
| 2201 | */ |
| 2202 | if (info->break_detected_cnt) { |
| 2203 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); |
| 2204 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2205 | } else { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2206 | unsigned char data = IO_EXTRACT(R_SERIAL0_READ, |
| 2207 | data_in, data_read); |
| 2208 | char flag = TTY_NORMAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2210 | tty_insert_flip_char(&info->port, 0, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | info->icount.rx++; |
| 2212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | |
| 2214 | if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) { |
| 2215 | info->icount.parity++; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2216 | flag = TTY_PARITY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) { |
| 2218 | info->icount.overrun++; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2219 | flag = TTY_OVERRUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2220 | } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) { |
| 2221 | info->icount.frame++; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2222 | flag = TTY_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | } |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2224 | tty_insert_flip_char(&info->port, data, flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | info->errorcode = 0; |
| 2226 | } |
| 2227 | info->break_detected_cnt = 0; |
| 2228 | } |
| 2229 | } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
| 2230 | /* No error */ |
| 2231 | DLOG_INT_TRIG( |
| 2232 | if (!log_int_trig1_pos) { |
| 2233 | if (log_int_pos >= log_int_size) { |
| 2234 | log_int_pos = 0; |
| 2235 | } |
| 2236 | log_int_trig0_pos = log_int_pos; |
| 2237 | log_int(rdpc(), 0, 0); |
| 2238 | } |
| 2239 | ); |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2240 | tty_insert_flip_char(&info->port, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2241 | IO_EXTRACT(R_SERIAL0_READ, data_in, data_read), |
| 2242 | TTY_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | } else { |
| 2244 | DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read); |
| 2245 | } |
| 2246 | |
| 2247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | info->icount.rx++; |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2249 | data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
| 2251 | DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)); |
| 2252 | goto more_data; |
| 2253 | } |
| 2254 | |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 2255 | tty_flip_buffer_push(&info->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | } |
| 2257 | |
Jiri Slaby | 12aad55 | 2013-03-07 13:12:35 +0100 | [diff] [blame] | 2258 | static void handle_ser_rx_interrupt(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | { |
| 2260 | unsigned char rstat; |
| 2261 | |
| 2262 | #ifdef SERIAL_DEBUG_INTR |
| 2263 | printk("Interrupt from serport %d\n", i); |
| 2264 | #endif |
| 2265 | /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */ |
| 2266 | if (!info->uses_dma_in) { |
Jiri Slaby | 12aad55 | 2013-03-07 13:12:35 +0100 | [diff] [blame] | 2267 | handle_ser_rx_interrupt_no_dma(info); |
| 2268 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | } |
| 2270 | /* DMA is used */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2271 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
| 2273 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); |
| 2274 | } |
| 2275 | |
| 2276 | if (rstat & SER_ERROR_MASK) { |
| 2277 | unsigned char data; |
| 2278 | |
| 2279 | info->last_rx_active_usec = GET_JIFFIES_USEC(); |
| 2280 | info->last_rx_active = jiffies; |
| 2281 | /* If we got an error, we must reset it by reading the |
| 2282 | * data_in field |
| 2283 | */ |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2284 | data = info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data)); |
| 2286 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat)); |
| 2287 | if (!data && (rstat & SER_FRAMING_ERR_MASK)) { |
| 2288 | /* Most likely a break, but we get interrupts over and |
| 2289 | * over again. |
| 2290 | */ |
| 2291 | |
| 2292 | if (!info->break_detected_cnt) { |
| 2293 | DEBUG_LOG(info->line, "#BRK start\n", 0); |
| 2294 | } |
| 2295 | if (rstat & SER_RXD_MASK) { |
| 2296 | /* The RX pin is high now, so the break |
| 2297 | * must be over, but.... |
| 2298 | * we can't really know if we will get another |
| 2299 | * last byte ending the break or not. |
| 2300 | * And we don't know if the byte (if any) will |
| 2301 | * have an error or look valid. |
| 2302 | */ |
| 2303 | DEBUG_LOG(info->line, "# BL BRK\n", 0); |
| 2304 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2305 | } |
| 2306 | info->break_detected_cnt++; |
| 2307 | } else { |
| 2308 | /* The error does not look like a break, but could be |
| 2309 | * the end of one |
| 2310 | */ |
| 2311 | if (info->break_detected_cnt) { |
| 2312 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); |
| 2313 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2314 | } else { |
| 2315 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
| 2316 | info->icount.brk++; |
| 2317 | add_char_and_flag(info, '\0', TTY_BREAK); |
| 2318 | } |
| 2319 | |
| 2320 | if (rstat & SER_PAR_ERR_MASK) { |
| 2321 | info->icount.parity++; |
| 2322 | add_char_and_flag(info, data, TTY_PARITY); |
| 2323 | } else if (rstat & SER_OVERRUN_MASK) { |
| 2324 | info->icount.overrun++; |
| 2325 | add_char_and_flag(info, data, TTY_OVERRUN); |
| 2326 | } else if (rstat & SER_FRAMING_ERR_MASK) { |
| 2327 | info->icount.frame++; |
| 2328 | add_char_and_flag(info, data, TTY_FRAME); |
| 2329 | } |
| 2330 | |
| 2331 | info->errorcode = 0; |
| 2332 | } |
| 2333 | info->break_detected_cnt = 0; |
| 2334 | DEBUG_LOG(info->line, "#iERR s d %04X\n", |
| 2335 | ((rstat & SER_ERROR_MASK) << 8) | data); |
| 2336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | } else { /* It was a valid byte, now let the DMA do the rest */ |
| 2338 | unsigned long curr_time_u = GET_JIFFIES_USEC(); |
| 2339 | unsigned long curr_time = jiffies; |
| 2340 | |
| 2341 | if (info->break_detected_cnt) { |
| 2342 | /* Detect if this character is a new valid char or the |
| 2343 | * last char in a break sequence: If LSBits are 0 and |
| 2344 | * MSBits are high AND the time is close to the |
| 2345 | * previous interrupt we should discard it. |
| 2346 | */ |
| 2347 | long elapsed_usec = |
| 2348 | (curr_time - info->last_rx_active) * (1000000/HZ) + |
| 2349 | curr_time_u - info->last_rx_active_usec; |
| 2350 | if (elapsed_usec < 2*info->char_time_usec) { |
| 2351 | DEBUG_LOG(info->line, "FBRK %i\n", info->line); |
| 2352 | /* Report as BREAK (error) and let |
| 2353 | * receive_chars_dma() handle it |
| 2354 | */ |
| 2355 | info->errorcode = ERRCODE_SET_BREAK; |
| 2356 | } else { |
| 2357 | DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line); |
| 2358 | } |
| 2359 | DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt); |
| 2360 | } |
| 2361 | |
| 2362 | #ifdef SERIAL_DEBUG_INTR |
| 2363 | printk("** OK, disabling ser_interrupts\n"); |
| 2364 | #endif |
| 2365 | e100_disable_serial_data_irq(info); |
| 2366 | DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line)); |
| 2367 | info->break_detected_cnt = 0; |
| 2368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | } |
| 2370 | /* Restarting the DMA never hurts */ |
| 2371 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); |
| 2372 | START_FLUSH_FAST_TIMER(info, "ser_int"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | } /* handle_ser_rx_interrupt */ |
| 2374 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2375 | static void handle_ser_tx_interrupt(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | { |
| 2377 | unsigned long flags; |
| 2378 | |
| 2379 | if (info->x_char) { |
| 2380 | unsigned char rstat; |
| 2381 | 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] | 2382 | local_irq_save(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2383 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
| 2385 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2386 | info->ioport[REG_TR_DATA] = info->x_char; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | info->icount.tx++; |
| 2388 | info->x_char = 0; |
| 2389 | /* We must enable since it is disabled in ser_interrupt */ |
| 2390 | e100_enable_serial_tx_ready_irq(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2391 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | return; |
| 2393 | } |
| 2394 | if (info->uses_dma_out) { |
| 2395 | unsigned char rstat; |
| 2396 | int i; |
| 2397 | /* We only use normal tx interrupt when sending x_char */ |
| 2398 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0)); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2399 | local_irq_save(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2400 | rstat = info->ioport[REG_STATUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2401 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
| 2402 | e100_disable_serial_tx_ready_irq(info); |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2403 | if (info->port.tty->stopped) |
| 2404 | rs_stop(info->port.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | /* Enable the DMA channel and tell it to continue */ |
| 2406 | e100_enable_txdma_channel(info); |
| 2407 | /* Wait 12 cycles before doing the DMA command */ |
| 2408 | for(i = 6; i > 0; i--) |
| 2409 | nop(); |
| 2410 | |
| 2411 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2412 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | return; |
| 2414 | } |
| 2415 | /* Normal char-by-char interrupt */ |
| 2416 | if (info->xmit.head == info->xmit.tail |
Jiri Slaby | ee79706 | 2013-03-07 13:12:34 +0100 | [diff] [blame] | 2417 | || info->port.tty->stopped) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2418 | DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", |
| 2419 | info->port.tty->stopped)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | e100_disable_serial_tx_ready_irq(info); |
| 2421 | info->tr_running = 0; |
| 2422 | return; |
| 2423 | } |
| 2424 | DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail])); |
| 2425 | /* Send a byte, rs485 timing is critical so turn of ints */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2426 | local_irq_save(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2427 | info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1); |
| 2429 | info->icount.tx++; |
| 2430 | if (info->xmit.head == info->xmit.tail) { |
| 2431 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 2432 | if (info->rs485.flags & SER_RS485_ENABLED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | /* Set a short timer to toggle RTS */ |
| 2434 | start_one_shot_timer(&fast_timers_rs485[info->line], |
| 2435 | rs485_toggle_rts_timer_function, |
| 2436 | (unsigned long)info, |
| 2437 | info->char_time_usec*2, |
| 2438 | "RS-485"); |
| 2439 | } |
| 2440 | #endif /* RS485 */ |
| 2441 | info->last_tx_active_usec = GET_JIFFIES_USEC(); |
| 2442 | info->last_tx_active = jiffies; |
| 2443 | e100_disable_serial_tx_ready_irq(info); |
| 2444 | info->tr_running = 0; |
| 2445 | DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0)); |
| 2446 | } else { |
| 2447 | /* We must enable since it is disabled in ser_interrupt */ |
| 2448 | e100_enable_serial_tx_ready_irq(info); |
| 2449 | } |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2450 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | |
| 2452 | if (CIRC_CNT(info->xmit.head, |
| 2453 | info->xmit.tail, |
| 2454 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 2455 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 2456 | |
| 2457 | } /* handle_ser_tx_interrupt */ |
| 2458 | |
| 2459 | /* result of time measurements: |
| 2460 | * RX duration 54-60 us when doing something, otherwise 6-9 us |
| 2461 | * ser_int duration: just sending: 8-15 us normally, up to 73 us |
| 2462 | */ |
| 2463 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2464 | ser_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | { |
| 2466 | static volatile int tx_started = 0; |
| 2467 | struct e100_serial *info; |
| 2468 | int i; |
| 2469 | unsigned long flags; |
| 2470 | unsigned long irq_mask1_rd; |
| 2471 | unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */ |
| 2472 | int handled = 0; |
| 2473 | static volatile unsigned long reentered_ready_mask = 0; |
| 2474 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2475 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | irq_mask1_rd = *R_IRQ_MASK1_RD; |
| 2477 | /* First handle all rx interrupts with ints disabled */ |
| 2478 | info = rs_table; |
| 2479 | irq_mask1_rd &= e100_ser_int_mask; |
| 2480 | for (i = 0; i < NR_PORTS; i++) { |
| 2481 | /* Which line caused the data irq? */ |
| 2482 | if (irq_mask1_rd & data_mask) { |
| 2483 | handled = 1; |
| 2484 | handle_ser_rx_interrupt(info); |
| 2485 | } |
| 2486 | info += 1; |
| 2487 | data_mask <<= 2; |
| 2488 | } |
| 2489 | /* Handle tx interrupts with interrupts enabled so we |
| 2490 | * can take care of new data interrupts while transmitting |
| 2491 | * We protect the tx part with the tx_started flag. |
| 2492 | * We disable the tr_ready interrupts we are about to handle and |
| 2493 | * unblock the serial interrupt so new serial interrupts may come. |
| 2494 | * |
| 2495 | * If we get a new interrupt: |
| 2496 | * - it migth be due to synchronous serial ports. |
| 2497 | * - serial irq will be blocked by general irq handler. |
| 2498 | * - async data will be handled above (sync will be ignored). |
| 2499 | * - tx_started flag will prevent us from trying to send again and |
| 2500 | * we will exit fast - no need to unblock serial irq. |
| 2501 | * - Next (sync) serial interrupt handler will be runned with |
| 2502 | * disabled interrupt due to restore_flags() at end of function, |
| 2503 | * so sync handler will not be preempted or reentered. |
| 2504 | */ |
| 2505 | if (!tx_started) { |
| 2506 | unsigned long ready_mask; |
| 2507 | unsigned long |
| 2508 | tx_started = 1; |
| 2509 | /* Only the tr_ready interrupts left */ |
| 2510 | irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
| 2511 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
| 2512 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
| 2513 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); |
| 2514 | while (irq_mask1_rd) { |
| 2515 | /* Disable those we are about to handle */ |
| 2516 | *R_IRQ_MASK1_CLR = irq_mask1_rd; |
| 2517 | /* Unblock the serial interrupt */ |
| 2518 | *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set); |
| 2519 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2520 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */ |
| 2522 | info = rs_table; |
| 2523 | for (i = 0; i < NR_PORTS; i++) { |
| 2524 | /* Which line caused the ready irq? */ |
| 2525 | if (irq_mask1_rd & ready_mask) { |
| 2526 | handled = 1; |
| 2527 | handle_ser_tx_interrupt(info); |
| 2528 | } |
| 2529 | info += 1; |
| 2530 | ready_mask <<= 2; |
| 2531 | } |
| 2532 | /* handle_ser_tx_interrupt enables tr_ready interrupts */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2533 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2534 | /* Handle reentered TX interrupt */ |
| 2535 | irq_mask1_rd = reentered_ready_mask; |
| 2536 | } |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2537 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2538 | tx_started = 0; |
| 2539 | } else { |
| 2540 | unsigned long ready_mask; |
| 2541 | ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
| 2542 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
| 2543 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
| 2544 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); |
| 2545 | if (ready_mask) { |
| 2546 | reentered_ready_mask |= ready_mask; |
| 2547 | /* Disable those we are about to handle */ |
| 2548 | *R_IRQ_MASK1_CLR = ready_mask; |
| 2549 | DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask)); |
| 2550 | } |
| 2551 | } |
| 2552 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2553 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | return IRQ_RETVAL(handled); |
| 2555 | } /* ser_interrupt */ |
| 2556 | #endif |
| 2557 | |
| 2558 | /* |
| 2559 | * ------------------------------------------------------------------- |
| 2560 | * Here ends the serial interrupt routines. |
| 2561 | * ------------------------------------------------------------------- |
| 2562 | */ |
| 2563 | |
| 2564 | /* |
| 2565 | * This routine is used to handle the "bottom half" processing for the |
| 2566 | * serial driver, known also the "software interrupt" processing. |
| 2567 | * This processing is done at the kernel interrupt level, after the |
| 2568 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This |
| 2569 | * is where time-consuming activities which can not be done in the |
| 2570 | * interrupt driver proper are done; the interrupt driver schedules |
| 2571 | * them using rs_sched_event(), and they get done here. |
| 2572 | */ |
| 2573 | static void |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2574 | do_softint(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2575 | { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2576 | struct e100_serial *info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | struct tty_struct *tty; |
| 2578 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2579 | info = container_of(work, struct e100_serial, work); |
| 2580 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2581 | tty = info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2582 | if (!tty) |
| 2583 | return; |
| 2584 | |
Jiri Slaby | b963a84 | 2007-02-10 01:44:55 -0800 | [diff] [blame] | 2585 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) |
| 2586 | tty_wakeup(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | } |
| 2588 | |
| 2589 | static int |
| 2590 | startup(struct e100_serial * info) |
| 2591 | { |
| 2592 | unsigned long flags; |
| 2593 | unsigned long xmit_page; |
| 2594 | int i; |
| 2595 | |
| 2596 | xmit_page = get_zeroed_page(GFP_KERNEL); |
| 2597 | if (!xmit_page) |
| 2598 | return -ENOMEM; |
| 2599 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2600 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | |
| 2602 | /* if it was already initialized, skip this */ |
| 2603 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2604 | if (info->port.flags & ASYNC_INITIALIZED) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2605 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2606 | free_page(xmit_page); |
| 2607 | return 0; |
| 2608 | } |
| 2609 | |
| 2610 | if (info->xmit.buf) |
| 2611 | free_page(xmit_page); |
| 2612 | else |
| 2613 | info->xmit.buf = (unsigned char *) xmit_page; |
| 2614 | |
| 2615 | #ifdef SERIAL_DEBUG_OPEN |
| 2616 | printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf); |
| 2617 | #endif |
| 2618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2619 | /* |
| 2620 | * Clear the FIFO buffers and disable them |
| 2621 | * (they will be reenabled in change_speed()) |
| 2622 | */ |
| 2623 | |
| 2624 | /* |
| 2625 | * Reset the DMA channels and make sure their interrupts are cleared |
| 2626 | */ |
| 2627 | |
| 2628 | if (info->dma_in_enabled) { |
| 2629 | info->uses_dma_in = 1; |
| 2630 | e100_enable_rxdma_channel(info); |
| 2631 | |
| 2632 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2633 | |
| 2634 | /* Wait until reset cycle is complete */ |
| 2635 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == |
| 2636 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 2637 | |
| 2638 | /* Make sure the irqs are cleared */ |
| 2639 | *info->iclrintradr = |
| 2640 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 2641 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 2642 | } else { |
| 2643 | e100_disable_rxdma_channel(info); |
| 2644 | } |
| 2645 | |
| 2646 | if (info->dma_out_enabled) { |
| 2647 | info->uses_dma_out = 1; |
| 2648 | e100_enable_txdma_channel(info); |
| 2649 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2650 | |
| 2651 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) == |
| 2652 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 2653 | |
| 2654 | /* Make sure the irqs are cleared */ |
| 2655 | *info->oclrintradr = |
| 2656 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 2657 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 2658 | } else { |
| 2659 | e100_disable_txdma_channel(info); |
| 2660 | } |
| 2661 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2662 | if (info->port.tty) |
| 2663 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2664 | |
| 2665 | info->xmit.head = info->xmit.tail = 0; |
| 2666 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 2667 | info->recv_cnt = info->max_recv_cnt = 0; |
| 2668 | |
| 2669 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 2670 | info->rec_descr[i].buf = 0; |
| 2671 | |
| 2672 | /* |
| 2673 | * and set the speed and other flags of the serial port |
| 2674 | * this will start the rx/tx as well |
| 2675 | */ |
| 2676 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 2677 | e100_enable_serial_data_irq(info); |
| 2678 | #endif |
| 2679 | change_speed(info); |
| 2680 | |
| 2681 | /* dummy read to reset any serial errors */ |
| 2682 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2683 | (void)info->ioport[REG_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | |
| 2685 | /* enable the interrupts */ |
| 2686 | if (info->uses_dma_out) |
| 2687 | e100_enable_txdma_irq(info); |
| 2688 | |
| 2689 | e100_enable_rx_irq(info); |
| 2690 | |
| 2691 | info->tr_running = 0; /* to be sure we don't lock up the transmitter */ |
| 2692 | |
| 2693 | /* setup the dma input descriptor and start dma */ |
| 2694 | |
| 2695 | start_receive(info); |
| 2696 | |
| 2697 | /* for safety, make sure the descriptors last result is 0 bytes written */ |
| 2698 | |
| 2699 | info->tr_descr.sw_len = 0; |
| 2700 | info->tr_descr.hw_len = 0; |
| 2701 | info->tr_descr.status = 0; |
| 2702 | |
| 2703 | /* enable RTS/DTR last */ |
| 2704 | |
| 2705 | e100_rts(info, 1); |
| 2706 | e100_dtr(info, 1); |
| 2707 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2708 | info->port.flags |= ASYNC_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2710 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | return 0; |
| 2712 | } |
| 2713 | |
| 2714 | /* |
| 2715 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 2716 | * DTR is dropped if the hangup on close termio flag is on. |
| 2717 | */ |
| 2718 | static void |
| 2719 | shutdown(struct e100_serial * info) |
| 2720 | { |
| 2721 | unsigned long flags; |
| 2722 | struct etrax_dma_descr *descr = info->rec_descr; |
| 2723 | struct etrax_recv_buffer *buffer; |
| 2724 | int i; |
| 2725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | /* shut down the transmitter and receiver */ |
| 2727 | DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line)); |
| 2728 | e100_disable_rx(info); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2729 | info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | |
| 2731 | /* disable interrupts, reset dma channels */ |
| 2732 | if (info->uses_dma_in) { |
| 2733 | e100_disable_rxdma_irq(info); |
| 2734 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2735 | info->uses_dma_in = 0; |
| 2736 | } else { |
| 2737 | e100_disable_serial_data_irq(info); |
| 2738 | } |
| 2739 | |
| 2740 | if (info->uses_dma_out) { |
| 2741 | e100_disable_txdma_irq(info); |
| 2742 | info->tr_running = 0; |
| 2743 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2744 | info->uses_dma_out = 0; |
| 2745 | } else { |
| 2746 | e100_disable_serial_tx_ready_irq(info); |
| 2747 | info->tr_running = 0; |
| 2748 | } |
| 2749 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2750 | if (!(info->port.flags & ASYNC_INITIALIZED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | return; |
| 2752 | |
| 2753 | #ifdef SERIAL_DEBUG_OPEN |
| 2754 | printk("Shutting down serial port %d (irq %d)....\n", info->line, |
| 2755 | info->irq); |
| 2756 | #endif |
| 2757 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2758 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | |
| 2760 | if (info->xmit.buf) { |
| 2761 | free_page((unsigned long)info->xmit.buf); |
| 2762 | info->xmit.buf = NULL; |
| 2763 | } |
| 2764 | |
| 2765 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 2766 | if (descr[i].buf) { |
| 2767 | buffer = phys_to_virt(descr[i].buf) - sizeof *buffer; |
| 2768 | kfree(buffer); |
| 2769 | descr[i].buf = 0; |
| 2770 | } |
| 2771 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2772 | if (!info->port.tty || (info->port.tty->termios.c_cflag & HUPCL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2773 | /* hang up DTR and RTS if HUPCL is enabled */ |
| 2774 | e100_dtr(info, 0); |
| 2775 | e100_rts(info, 0); /* could check CRTSCTS before doing this */ |
| 2776 | } |
| 2777 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2778 | if (info->port.tty) |
| 2779 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2780 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2781 | info->port.flags &= ~ASYNC_INITIALIZED; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2782 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | } |
| 2784 | |
| 2785 | |
| 2786 | /* change baud rate and other assorted parameters */ |
| 2787 | |
| 2788 | static void |
| 2789 | change_speed(struct e100_serial *info) |
| 2790 | { |
| 2791 | unsigned int cflag; |
| 2792 | unsigned long xoff; |
| 2793 | unsigned long flags; |
| 2794 | /* first some safety checks */ |
| 2795 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2796 | if (!info->port.tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | return; |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2798 | if (!info->ioport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | return; |
| 2800 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2801 | cflag = info->port.tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2802 | |
| 2803 | /* possibly, the tx/rx should be disabled first to do this safely */ |
| 2804 | |
| 2805 | /* change baud-rate and write it to the hardware */ |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 2806 | if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | /* Special baudrate */ |
| 2808 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ |
| 2809 | unsigned long alt_source = |
| 2810 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | |
| 2811 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); |
| 2812 | /* R_ALT_SER_BAUDRATE selects the source */ |
| 2813 | DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n", |
| 2814 | (unsigned long)info->baud_base, info->custom_divisor)); |
| 2815 | if (info->baud_base == SERIAL_PRESCALE_BASE) { |
| 2816 | /* 0, 2-65535 (0=65536) */ |
| 2817 | u16 divisor = info->custom_divisor; |
| 2818 | /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */ |
| 2819 | /* baudrate is 3.125MHz/custom_divisor */ |
| 2820 | alt_source = |
| 2821 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) | |
| 2822 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale); |
| 2823 | alt_source = 0x11; |
| 2824 | DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor)); |
| 2825 | *R_SERIAL_PRESCALE = divisor; |
| 2826 | info->baud = SERIAL_PRESCALE_BASE/divisor; |
| 2827 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2828 | else |
| 2829 | { |
| 2830 | /* Bad baudbase, we don't support using timer0 |
| 2831 | * for baudrate. |
| 2832 | */ |
| 2833 | printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n", |
| 2834 | (unsigned long)info->baud_base, info->custom_divisor); |
| 2835 | } |
| 2836 | r_alt_ser_baudrate_shadow &= ~mask; |
| 2837 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); |
| 2838 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; |
| 2839 | } else { |
| 2840 | /* Normal baudrate */ |
| 2841 | /* Make sure we use normal baudrate */ |
| 2842 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ |
| 2843 | unsigned long alt_source = |
| 2844 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | |
| 2845 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); |
| 2846 | r_alt_ser_baudrate_shadow &= ~mask; |
| 2847 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2849 | |
| 2850 | info->baud = cflag_to_baud(cflag); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2851 | info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2852 | } |
| 2853 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | /* start with default settings and then fill in changes */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2855 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2856 | /* 8 bit, no/even parity */ |
| 2857 | info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) | |
| 2858 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) | |
| 2859 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par)); |
| 2860 | |
| 2861 | /* 8 bit, no/even parity, 1 stop bit, no cts */ |
| 2862 | info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) | |
| 2863 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) | |
| 2864 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par) | |
| 2865 | IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) | |
| 2866 | IO_MASK(R_SERIAL0_TR_CTRL, auto_cts)); |
| 2867 | |
| 2868 | if ((cflag & CSIZE) == CS7) { |
| 2869 | /* set 7 bit mode */ |
| 2870 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit); |
| 2871 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit); |
| 2872 | } |
| 2873 | |
| 2874 | if (cflag & CSTOPB) { |
| 2875 | /* set 2 stop bit mode */ |
| 2876 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits); |
| 2877 | } |
| 2878 | |
| 2879 | if (cflag & PARENB) { |
| 2880 | /* enable parity */ |
| 2881 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable); |
| 2882 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable); |
| 2883 | } |
| 2884 | |
| 2885 | if (cflag & CMSPAR) { |
| 2886 | /* enable stick parity, PARODD mean Mark which matches ETRAX */ |
| 2887 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick); |
| 2888 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick); |
| 2889 | } |
| 2890 | if (cflag & PARODD) { |
| 2891 | /* set odd parity (or Mark if CMSPAR) */ |
| 2892 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd); |
| 2893 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd); |
| 2894 | } |
| 2895 | |
| 2896 | if (cflag & CRTSCTS) { |
| 2897 | /* enable automatic CTS handling */ |
| 2898 | DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0)); |
| 2899 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active); |
| 2900 | } |
| 2901 | |
| 2902 | /* make sure the tx and rx are enabled */ |
| 2903 | |
| 2904 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable); |
| 2905 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable); |
| 2906 | |
| 2907 | /* actually write the control regs to the hardware */ |
| 2908 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2909 | info->ioport[REG_TR_CTRL] = info->tx_ctrl; |
| 2910 | info->ioport[REG_REC_CTRL] = info->rx_ctrl; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2911 | 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] | 2912 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 2913 | if (info->port.tty->termios.c_iflag & IXON ) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 2914 | DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", |
| 2915 | STOP_CHAR(info->port.tty))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 2917 | } |
| 2918 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2919 | *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2920 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | |
| 2922 | update_char_time(info); |
| 2923 | |
| 2924 | } /* change_speed */ |
| 2925 | |
| 2926 | /* start transmitting chars NOW */ |
| 2927 | |
| 2928 | static void |
| 2929 | rs_flush_chars(struct tty_struct *tty) |
| 2930 | { |
| 2931 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 2932 | unsigned long flags; |
| 2933 | |
| 2934 | if (info->tr_running || |
| 2935 | info->xmit.head == info->xmit.tail || |
| 2936 | tty->stopped || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2937 | !info->xmit.buf) |
| 2938 | return; |
| 2939 | |
| 2940 | #ifdef SERIAL_DEBUG_FLOW |
| 2941 | printk("rs_flush_chars\n"); |
| 2942 | #endif |
| 2943 | |
| 2944 | /* this protection might not exactly be necessary here */ |
| 2945 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2946 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2947 | start_transmit(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2948 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2949 | } |
| 2950 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2951 | static int rs_raw_write(struct tty_struct *tty, |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2952 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2953 | { |
| 2954 | int c, ret = 0; |
| 2955 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 2956 | unsigned long flags; |
| 2957 | |
| 2958 | /* first some sanity checks */ |
| 2959 | |
Cong Ding | f938f37 | 2013-01-16 23:30:44 +0100 | [diff] [blame] | 2960 | if (!info->xmit.buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2961 | return 0; |
| 2962 | |
| 2963 | #ifdef SERIAL_DEBUG_DATA |
| 2964 | if (info->line == SERIAL_DEBUG_LINE) |
| 2965 | printk("rs_raw_write (%d), status %d\n", |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 2966 | count, info->ioport[REG_STATUS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2967 | #endif |
| 2968 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2969 | local_save_flags(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2970 | DFLOW(DEBUG_LOG(info->line, "write count %i ", count)); |
| 2971 | DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty))); |
| 2972 | |
| 2973 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2974 | /* The local_irq_disable/restore_flags pairs below are needed |
| 2975 | * because the DMA interrupt handler moves the info->xmit values. |
| 2976 | * the memcpy needs to be in the critical region unfortunately, |
| 2977 | * because we need to read xmit values, memcpy, write xmit values |
| 2978 | * in one atomic operation... this could perhaps be avoided by |
| 2979 | * more clever design. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2980 | */ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2981 | local_irq_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2982 | while (count) { |
| 2983 | c = CIRC_SPACE_TO_END(info->xmit.head, |
| 2984 | info->xmit.tail, |
| 2985 | SERIAL_XMIT_SIZE); |
| 2986 | |
| 2987 | if (count < c) |
| 2988 | c = count; |
| 2989 | if (c <= 0) |
| 2990 | break; |
| 2991 | |
| 2992 | memcpy(info->xmit.buf + info->xmit.head, buf, c); |
| 2993 | info->xmit.head = (info->xmit.head + c) & |
| 2994 | (SERIAL_XMIT_SIZE-1); |
| 2995 | buf += c; |
| 2996 | count -= c; |
| 2997 | ret += c; |
| 2998 | } |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 2999 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3000 | |
| 3001 | /* enable transmitter if not running, unless the tty is stopped |
| 3002 | * this does not need IRQ protection since if tr_running == 0 |
| 3003 | * the IRQ's are not running anyway for this port. |
| 3004 | */ |
| 3005 | DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret)); |
| 3006 | |
| 3007 | if (info->xmit.head != info->xmit.tail && |
| 3008 | !tty->stopped && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3009 | !info->tr_running) { |
| 3010 | start_transmit(info); |
| 3011 | } |
| 3012 | |
| 3013 | return ret; |
| 3014 | } /* raw_raw_write() */ |
| 3015 | |
| 3016 | static int |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3017 | rs_write(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3018 | const unsigned char *buf, int count) |
| 3019 | { |
| 3020 | #if defined(CONFIG_ETRAX_RS485) |
| 3021 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3022 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3023 | if (info->rs485.flags & SER_RS485_ENABLED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3024 | { |
| 3025 | /* If we are in RS-485 mode, we need to toggle RTS and disable |
| 3026 | * the receiver before initiating a DMA transfer |
| 3027 | */ |
| 3028 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 3029 | /* Abort any started timer */ |
| 3030 | fast_timers_rs485[info->line].function = NULL; |
| 3031 | del_fast_timer(&fast_timers_rs485[info->line]); |
| 3032 | #endif |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3033 | e100_rts(info, (info->rs485.flags & SER_RS485_RTS_ON_SEND)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3034 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 3035 | e100_disable_rx(info); |
| 3036 | e100_enable_rx_irq(info); |
| 3037 | #endif |
Claudio Scordino | 93f3350 | 2011-11-09 15:51:49 +0100 | [diff] [blame] | 3038 | if (info->rs485.delay_rts_before_send > 0) |
| 3039 | msleep(info->rs485.delay_rts_before_send); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | } |
| 3041 | #endif /* CONFIG_ETRAX_RS485 */ |
| 3042 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3043 | count = rs_raw_write(tty, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3044 | |
| 3045 | #if defined(CONFIG_ETRAX_RS485) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3046 | if (info->rs485.flags & SER_RS485_ENABLED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3047 | { |
| 3048 | unsigned int val; |
| 3049 | /* If we are in RS-485 mode the following has to be done: |
| 3050 | * wait until DMA is ready |
| 3051 | * wait on transmit shift register |
| 3052 | * toggle RTS |
| 3053 | * enable the receiver |
| 3054 | */ |
| 3055 | |
| 3056 | /* Sleep until all sent */ |
| 3057 | tty_wait_until_sent(tty, 0); |
| 3058 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 3059 | /* Now sleep a little more so that shift register is empty */ |
| 3060 | schedule_usleep(info->char_time_usec * 2); |
| 3061 | #endif |
| 3062 | /* wait on transmit shift register */ |
| 3063 | do{ |
| 3064 | get_lsr_info(info, &val); |
| 3065 | }while (!(val & TIOCSER_TEMT)); |
| 3066 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3067 | e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | |
| 3069 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 3070 | e100_enable_rx(info); |
| 3071 | e100_enable_rxdma_irq(info); |
| 3072 | #endif |
| 3073 | } |
| 3074 | #endif /* CONFIG_ETRAX_RS485 */ |
| 3075 | |
| 3076 | return count; |
| 3077 | } /* rs_write */ |
| 3078 | |
| 3079 | |
| 3080 | /* how much space is available in the xmit buffer? */ |
| 3081 | |
| 3082 | static int |
| 3083 | rs_write_room(struct tty_struct *tty) |
| 3084 | { |
| 3085 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3086 | |
| 3087 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 3088 | } |
| 3089 | |
| 3090 | /* How many chars are in the xmit buffer? |
| 3091 | * This does not include any chars in the transmitter FIFO. |
| 3092 | * Use wait_until_sent for waiting for FIFO drain. |
| 3093 | */ |
| 3094 | |
| 3095 | static int |
| 3096 | rs_chars_in_buffer(struct tty_struct *tty) |
| 3097 | { |
| 3098 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3099 | |
| 3100 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 3101 | } |
| 3102 | |
| 3103 | /* discard everything in the xmit buffer */ |
| 3104 | |
| 3105 | static void |
| 3106 | rs_flush_buffer(struct tty_struct *tty) |
| 3107 | { |
| 3108 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3109 | unsigned long flags; |
| 3110 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3111 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3112 | info->xmit.head = info->xmit.tail = 0; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3113 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3114 | |
Jiri Slaby | b963a84 | 2007-02-10 01:44:55 -0800 | [diff] [blame] | 3115 | tty_wakeup(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3116 | } |
| 3117 | |
| 3118 | /* |
| 3119 | * This function is used to send a high-priority XON/XOFF character to |
| 3120 | * the device |
| 3121 | * |
| 3122 | * Since we use DMA we don't check for info->x_char in transmit_chars_dma(), |
| 3123 | * but we do it in handle_ser_tx_interrupt(). |
| 3124 | * We disable DMA channel and enable tx ready interrupt and write the |
| 3125 | * character when possible. |
| 3126 | */ |
| 3127 | static void rs_send_xchar(struct tty_struct *tty, char ch) |
| 3128 | { |
| 3129 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3130 | unsigned long flags; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3131 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | if (info->uses_dma_out) { |
| 3133 | /* Put the DMA on hold and disable the channel */ |
| 3134 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold); |
| 3135 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) != |
| 3136 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold)); |
| 3137 | e100_disable_txdma_channel(info); |
| 3138 | } |
| 3139 | |
| 3140 | /* Must make sure transmitter is not stopped before we can transmit */ |
| 3141 | if (tty->stopped) |
| 3142 | rs_start(tty); |
| 3143 | |
| 3144 | /* Enable manual transmit interrupt and send from there */ |
| 3145 | DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch)); |
| 3146 | info->x_char = ch; |
| 3147 | e100_enable_serial_tx_ready_irq(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3148 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | } |
| 3150 | |
| 3151 | /* |
| 3152 | * ------------------------------------------------------------ |
| 3153 | * rs_throttle() |
| 3154 | * |
| 3155 | * This routine is called by the upper-layer tty layer to signal that |
| 3156 | * incoming characters should be throttled. |
| 3157 | * ------------------------------------------------------------ |
| 3158 | */ |
| 3159 | static void |
| 3160 | rs_throttle(struct tty_struct * tty) |
| 3161 | { |
| 3162 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3163 | #ifdef SERIAL_DEBUG_THROTTLE |
Rasmus Villemoes | 429b474 | 2015-03-31 15:55:59 +0200 | [diff] [blame] | 3164 | printk("throttle %s: %lu....\n", tty_name(tty), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3165 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); |
| 3166 | #endif |
| 3167 | DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty))); |
| 3168 | |
| 3169 | /* Do RTS before XOFF since XOFF might take some time */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 3170 | if (tty->termios.c_cflag & CRTSCTS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3171 | /* Turn off RTS line */ |
| 3172 | e100_rts(info, 0); |
| 3173 | } |
| 3174 | if (I_IXOFF(tty)) |
| 3175 | rs_send_xchar(tty, STOP_CHAR(tty)); |
| 3176 | |
| 3177 | } |
| 3178 | |
| 3179 | static void |
| 3180 | rs_unthrottle(struct tty_struct * tty) |
| 3181 | { |
| 3182 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3183 | #ifdef SERIAL_DEBUG_THROTTLE |
Rasmus Villemoes | 429b474 | 2015-03-31 15:55:59 +0200 | [diff] [blame] | 3184 | printk("unthrottle %s: %lu....\n", tty_name(tty), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3185 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); |
| 3186 | #endif |
| 3187 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty))); |
| 3188 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count)); |
| 3189 | /* Do RTS before XOFF since XOFF might take some time */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 3190 | if (tty->termios.c_cflag & CRTSCTS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3191 | /* Assert RTS line */ |
| 3192 | e100_rts(info, 1); |
| 3193 | } |
| 3194 | |
| 3195 | if (I_IXOFF(tty)) { |
| 3196 | if (info->x_char) |
| 3197 | info->x_char = 0; |
| 3198 | else |
| 3199 | rs_send_xchar(tty, START_CHAR(tty)); |
| 3200 | } |
| 3201 | |
| 3202 | } |
| 3203 | |
| 3204 | /* |
| 3205 | * ------------------------------------------------------------ |
| 3206 | * rs_ioctl() and friends |
| 3207 | * ------------------------------------------------------------ |
| 3208 | */ |
| 3209 | |
| 3210 | static int |
| 3211 | get_serial_info(struct e100_serial * info, |
| 3212 | struct serial_struct * retinfo) |
| 3213 | { |
| 3214 | struct serial_struct tmp; |
| 3215 | |
| 3216 | /* this is all probably wrong, there are a lot of fields |
| 3217 | * here that we don't have in e100_serial and maybe we |
| 3218 | * should set them to something else than 0. |
| 3219 | */ |
| 3220 | |
| 3221 | if (!retinfo) |
| 3222 | return -EFAULT; |
| 3223 | memset(&tmp, 0, sizeof(tmp)); |
| 3224 | tmp.type = info->type; |
| 3225 | tmp.line = info->line; |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3226 | tmp.port = (int)info->ioport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3227 | tmp.irq = info->irq; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3228 | tmp.flags = info->port.flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3229 | tmp.baud_base = info->baud_base; |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3230 | tmp.close_delay = info->port.close_delay; |
| 3231 | tmp.closing_wait = info->port.closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3232 | tmp.custom_divisor = info->custom_divisor; |
| 3233 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 3234 | return -EFAULT; |
| 3235 | return 0; |
| 3236 | } |
| 3237 | |
| 3238 | static int |
| 3239 | set_serial_info(struct e100_serial *info, |
| 3240 | struct serial_struct *new_info) |
| 3241 | { |
| 3242 | struct serial_struct new_serial; |
| 3243 | struct e100_serial old_info; |
| 3244 | int retval = 0; |
| 3245 | |
| 3246 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
| 3247 | return -EFAULT; |
| 3248 | |
| 3249 | old_info = *info; |
| 3250 | |
| 3251 | if (!capable(CAP_SYS_ADMIN)) { |
| 3252 | if ((new_serial.type != info->type) || |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3253 | (new_serial.close_delay != info->port.close_delay) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3254 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3255 | (info->port.flags & ~ASYNC_USR_MASK))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3256 | return -EPERM; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3257 | info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3258 | (new_serial.flags & ASYNC_USR_MASK)); |
| 3259 | goto check_and_exit; |
| 3260 | } |
| 3261 | |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3262 | if (info->port.count > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3263 | return -EBUSY; |
| 3264 | |
| 3265 | /* |
| 3266 | * OK, past this point, all the error checking has been done. |
| 3267 | * At this point, we start making changes..... |
| 3268 | */ |
| 3269 | |
| 3270 | info->baud_base = new_serial.baud_base; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3271 | info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3272 | (new_serial.flags & ASYNC_FLAGS)); |
| 3273 | info->custom_divisor = new_serial.custom_divisor; |
| 3274 | info->type = new_serial.type; |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3275 | info->port.close_delay = new_serial.close_delay; |
| 3276 | info->port.closing_wait = new_serial.closing_wait; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3277 | info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3278 | |
| 3279 | check_and_exit: |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3280 | if (info->port.flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3281 | change_speed(info); |
| 3282 | } else |
| 3283 | retval = startup(info); |
| 3284 | return retval; |
| 3285 | } |
| 3286 | |
| 3287 | /* |
| 3288 | * get_lsr_info - get line status register info |
| 3289 | * |
| 3290 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 3291 | * is emptied. On bus types like RS485, the transmitter must |
| 3292 | * release the bus after transmitting. This must be done when |
| 3293 | * the transmit shift register is empty, not be done when the |
| 3294 | * transmit holding register is empty. This functionality |
| 3295 | * allows an RS485 driver to be written in user space. |
| 3296 | */ |
| 3297 | static int |
| 3298 | get_lsr_info(struct e100_serial * info, unsigned int *value) |
| 3299 | { |
| 3300 | unsigned int result = TIOCSER_TEMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3301 | unsigned long curr_time = jiffies; |
| 3302 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); |
| 3303 | unsigned long elapsed_usec = |
| 3304 | (curr_time - info->last_tx_active) * 1000000/HZ + |
| 3305 | curr_time_usec - info->last_tx_active_usec; |
| 3306 | |
| 3307 | if (info->xmit.head != info->xmit.tail || |
| 3308 | elapsed_usec < 2*info->char_time_usec) { |
| 3309 | result = 0; |
| 3310 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3311 | |
| 3312 | if (copy_to_user(value, &result, sizeof(int))) |
| 3313 | return -EFAULT; |
| 3314 | return 0; |
| 3315 | } |
| 3316 | |
| 3317 | #ifdef SERIAL_DEBUG_IO |
| 3318 | struct state_str |
| 3319 | { |
| 3320 | int state; |
| 3321 | const char *str; |
| 3322 | }; |
| 3323 | |
| 3324 | const struct state_str control_state_str[] = { |
| 3325 | {TIOCM_DTR, "DTR" }, |
| 3326 | {TIOCM_RTS, "RTS"}, |
| 3327 | {TIOCM_ST, "ST?" }, |
| 3328 | {TIOCM_SR, "SR?" }, |
| 3329 | {TIOCM_CTS, "CTS" }, |
| 3330 | {TIOCM_CD, "CD" }, |
| 3331 | {TIOCM_RI, "RI" }, |
| 3332 | {TIOCM_DSR, "DSR" }, |
| 3333 | {0, NULL } |
| 3334 | }; |
| 3335 | |
| 3336 | char *get_control_state_str(int MLines, char *s) |
| 3337 | { |
| 3338 | int i = 0; |
| 3339 | |
| 3340 | s[0]='\0'; |
| 3341 | while (control_state_str[i].str != NULL) { |
| 3342 | if (MLines & control_state_str[i].state) { |
| 3343 | if (s[0] != '\0') { |
| 3344 | strcat(s, ", "); |
| 3345 | } |
| 3346 | strcat(s, control_state_str[i].str); |
| 3347 | } |
| 3348 | i++; |
| 3349 | } |
| 3350 | return s; |
| 3351 | } |
| 3352 | #endif |
| 3353 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3354 | static int |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3355 | rs_break(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3356 | { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3357 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3358 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3359 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3360 | if (!info->ioport) |
| 3361 | return -EIO; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3362 | |
| 3363 | local_irq_save(flags); |
| 3364 | if (break_state == -1) { |
| 3365 | /* Go to manual mode and set the txd pin to 0 */ |
| 3366 | /* Clear bit 7 (txd) and 6 (tr_enable) */ |
| 3367 | info->tx_ctrl &= 0x3F; |
| 3368 | } else { |
| 3369 | /* Set bit 7 (txd) and 6 (tr_enable) */ |
| 3370 | info->tx_ctrl |= (0x80 | 0x40); |
| 3371 | } |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3372 | info->ioport[REG_TR_CTRL] = info->tx_ctrl; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3373 | local_irq_restore(flags); |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 3374 | return 0; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3375 | } |
| 3376 | |
| 3377 | static int |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 3378 | rs_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3379 | { |
| 3380 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3381 | unsigned long flags; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3382 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3383 | local_irq_save(flags); |
Alan Cox | 032c17e | 2008-04-28 02:13:50 -0700 | [diff] [blame] | 3384 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3385 | if (clear & TIOCM_RTS) |
| 3386 | e100_rts(info, 0); |
| 3387 | if (clear & TIOCM_DTR) |
| 3388 | e100_dtr(info, 0); |
| 3389 | /* Handle FEMALE behaviour */ |
| 3390 | if (clear & TIOCM_RI) |
| 3391 | e100_ri_out(info, 0); |
| 3392 | if (clear & TIOCM_CD) |
| 3393 | e100_cd_out(info, 0); |
| 3394 | |
| 3395 | if (set & TIOCM_RTS) |
| 3396 | e100_rts(info, 1); |
| 3397 | if (set & TIOCM_DTR) |
| 3398 | e100_dtr(info, 1); |
| 3399 | /* Handle FEMALE behaviour */ |
| 3400 | if (set & TIOCM_RI) |
| 3401 | e100_ri_out(info, 1); |
| 3402 | if (set & TIOCM_CD) |
| 3403 | e100_cd_out(info, 1); |
Alan Cox | 032c17e | 2008-04-28 02:13:50 -0700 | [diff] [blame] | 3404 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3405 | local_irq_restore(flags); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3406 | return 0; |
| 3407 | } |
| 3408 | |
| 3409 | static int |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 3410 | rs_tiocmget(struct tty_struct *tty) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3411 | { |
| 3412 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3413 | unsigned int result; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3414 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3415 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3416 | local_irq_save(flags); |
| 3417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3418 | result = |
| 3419 | (!E100_RTS_GET(info) ? TIOCM_RTS : 0) |
| 3420 | | (!E100_DTR_GET(info) ? TIOCM_DTR : 0) |
| 3421 | | (!E100_RI_GET(info) ? TIOCM_RNG : 0) |
| 3422 | | (!E100_DSR_GET(info) ? TIOCM_DSR : 0) |
| 3423 | | (!E100_CD_GET(info) ? TIOCM_CAR : 0) |
| 3424 | | (!E100_CTS_GET(info) ? TIOCM_CTS : 0); |
| 3425 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3426 | local_irq_restore(flags); |
Alan Cox | 032c17e | 2008-04-28 02:13:50 -0700 | [diff] [blame] | 3427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3428 | #ifdef SERIAL_DEBUG_IO |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3429 | printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n", |
| 3430 | info->line, result, result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3431 | { |
| 3432 | char s[100]; |
| 3433 | |
| 3434 | get_control_state_str(result, s); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3435 | printk(KERN_DEBUG "state: %s\n", s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3436 | } |
| 3437 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3438 | return result; |
| 3439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3440 | } |
| 3441 | |
| 3442 | |
| 3443 | static int |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 3444 | rs_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3445 | unsigned int cmd, unsigned long arg) |
| 3446 | { |
| 3447 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 3448 | |
| 3449 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 3450 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && |
| 3451 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { |
| 3452 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 3453 | return -EIO; |
| 3454 | } |
| 3455 | |
| 3456 | switch (cmd) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3457 | case TIOCGSERIAL: |
| 3458 | return get_serial_info(info, |
| 3459 | (struct serial_struct *) arg); |
| 3460 | case TIOCSSERIAL: |
| 3461 | return set_serial_info(info, |
| 3462 | (struct serial_struct *) arg); |
| 3463 | case TIOCSERGETLSR: /* Get line status register */ |
| 3464 | return get_lsr_info(info, (unsigned int *) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3465 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3466 | case TIOCSERGSTRUCT: |
| 3467 | if (copy_to_user((struct e100_serial *) arg, |
| 3468 | info, sizeof(struct e100_serial))) |
| 3469 | return -EFAULT; |
| 3470 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3471 | |
| 3472 | #if defined(CONFIG_ETRAX_RS485) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3473 | case TIOCSERSETRS485: |
| 3474 | { |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3475 | /* In this ioctl we still use the old structure |
| 3476 | * rs485_control for backward compatibility |
| 3477 | * (if we use serial_rs485, then old user-level code |
| 3478 | * wouldn't work anymore...). |
| 3479 | * The use of this ioctl is deprecated: use TIOCSRS485 |
| 3480 | * instead.*/ |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3481 | struct rs485_control rs485ctrl; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3482 | struct serial_rs485 rs485data; |
| 3483 | 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] | 3484 | if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg, |
| 3485 | sizeof(rs485ctrl))) |
| 3486 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3487 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3488 | rs485data.delay_rts_before_send = rs485ctrl.delay_rts_before_send; |
| 3489 | rs485data.flags = 0; |
Jesper Nilsson | c7213fc | 2010-10-28 12:08:27 +0200 | [diff] [blame] | 3490 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3491 | if (rs485ctrl.enabled) |
| 3492 | rs485data.flags |= SER_RS485_ENABLED; |
| 3493 | else |
| 3494 | rs485data.flags &= ~(SER_RS485_ENABLED); |
| 3495 | |
| 3496 | if (rs485ctrl.rts_on_send) |
| 3497 | rs485data.flags |= SER_RS485_RTS_ON_SEND; |
| 3498 | else |
| 3499 | rs485data.flags &= ~(SER_RS485_RTS_ON_SEND); |
| 3500 | |
| 3501 | if (rs485ctrl.rts_after_sent) |
| 3502 | rs485data.flags |= SER_RS485_RTS_AFTER_SEND; |
| 3503 | else |
| 3504 | rs485data.flags &= ~(SER_RS485_RTS_AFTER_SEND); |
| 3505 | |
| 3506 | return e100_enable_rs485(tty, &rs485data); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3507 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3508 | |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3509 | case TIOCSRS485: |
| 3510 | { |
| 3511 | /* This is the new version of TIOCSRS485, with new |
| 3512 | * data structure serial_rs485 */ |
| 3513 | struct serial_rs485 rs485data; |
| 3514 | if (copy_from_user(&rs485data, (struct rs485_control *)arg, |
| 3515 | sizeof(rs485data))) |
| 3516 | return -EFAULT; |
| 3517 | |
| 3518 | return e100_enable_rs485(tty, &rs485data); |
| 3519 | } |
| 3520 | |
Claudio Scordino | f1d23ed | 2010-05-31 10:19:09 +0200 | [diff] [blame] | 3521 | case TIOCGRS485: |
| 3522 | { |
| 3523 | struct serial_rs485 *rs485data = |
| 3524 | &(((struct e100_serial *)tty->driver_data)->rs485); |
| 3525 | /* This is the ioctl to get RS485 data from user-space */ |
| 3526 | if (copy_to_user((struct serial_rs485 *) arg, |
| 3527 | rs485data, |
Jesper Nilsson | 94479c0 | 2010-10-28 12:04:55 +0200 | [diff] [blame] | 3528 | sizeof(struct serial_rs485))) |
Claudio Scordino | f1d23ed | 2010-05-31 10:19:09 +0200 | [diff] [blame] | 3529 | return -EFAULT; |
| 3530 | break; |
| 3531 | } |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3532 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3533 | case TIOCSERWRRS485: |
| 3534 | { |
| 3535 | struct rs485_write rs485wr; |
| 3536 | if (copy_from_user(&rs485wr, (struct rs485_write *)arg, |
| 3537 | sizeof(rs485wr))) |
| 3538 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3539 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3540 | return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size); |
| 3541 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3542 | #endif |
| 3543 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3544 | default: |
| 3545 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3546 | } |
| 3547 | return 0; |
| 3548 | } |
| 3549 | |
| 3550 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 3551 | rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3552 | { |
| 3553 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3555 | change_speed(info); |
| 3556 | |
| 3557 | /* Handle turning off CRTSCTS */ |
| 3558 | if ((old_termios->c_cflag & CRTSCTS) && |
Jiri Slaby | ee79706 | 2013-03-07 13:12:34 +0100 | [diff] [blame] | 3559 | !(tty->termios.c_cflag & CRTSCTS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3560 | rs_start(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3561 | |
| 3562 | } |
| 3563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3564 | /* |
| 3565 | * ------------------------------------------------------------ |
| 3566 | * rs_close() |
| 3567 | * |
| 3568 | * This routine is called when the serial port gets closed. First, we |
| 3569 | * wait for the last remaining data to be sent. Then, we unlink its |
| 3570 | * S structure from the interrupt chain if necessary, and we free |
| 3571 | * that IRQ if nothing is left in the chain. |
| 3572 | * ------------------------------------------------------------ |
| 3573 | */ |
| 3574 | static void |
| 3575 | rs_close(struct tty_struct *tty, struct file * filp) |
| 3576 | { |
| 3577 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 3578 | unsigned long flags; |
| 3579 | |
| 3580 | if (!info) |
| 3581 | return; |
| 3582 | |
| 3583 | /* interrupts are disabled for this entire function */ |
| 3584 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3585 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3586 | |
| 3587 | if (tty_hung_up_p(filp)) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3588 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3589 | return; |
| 3590 | } |
| 3591 | |
| 3592 | #ifdef SERIAL_DEBUG_OPEN |
| 3593 | printk("[%d] rs_close ttyS%d, count = %d\n", current->pid, |
| 3594 | info->line, info->count); |
| 3595 | #endif |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3596 | if ((tty->count == 1) && (info->port.count != 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3597 | /* |
| 3598 | * Uh, oh. tty->count is 1, which means that the tty |
| 3599 | * structure will be freed. Info->count should always |
| 3600 | * be one in these conditions. If it's greater than |
| 3601 | * one, we've got real problems, since it means the |
| 3602 | * serial port won't be shutdown. |
| 3603 | */ |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 3604 | printk(KERN_ERR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3605 | "rs_close: bad serial port count; tty->count is 1, " |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3606 | "info->count is %d\n", info->port.count); |
| 3607 | info->port.count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3608 | } |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3609 | if (--info->port.count < 0) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 3610 | 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] | 3611 | info->line, info->port.count); |
| 3612 | info->port.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3613 | } |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3614 | if (info->port.count) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3615 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3616 | return; |
| 3617 | } |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3618 | info->port.flags |= ASYNC_CLOSING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3619 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3620 | * Now we wait for the transmit buffer to clear; and we notify |
| 3621 | * the line discipline to only process XON/XOFF characters. |
| 3622 | */ |
| 3623 | tty->closing = 1; |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3624 | if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 3625 | tty_wait_until_sent(tty, info->port.closing_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3626 | /* |
| 3627 | * At this point we stop accepting input. To do this, we |
| 3628 | * disable the serial receiver and the DMA receive interrupt. |
| 3629 | */ |
| 3630 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 3631 | e100_disable_serial_data_irq(info); |
| 3632 | #endif |
| 3633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3634 | e100_disable_rx(info); |
| 3635 | e100_disable_rx_irq(info); |
| 3636 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3637 | if (info->port.flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3638 | /* |
| 3639 | * Before we drop DTR, make sure the UART transmitter |
| 3640 | * has completely drained; this is especially |
| 3641 | * important as we have a transmit FIFO! |
| 3642 | */ |
| 3643 | rs_wait_until_sent(tty, HZ); |
| 3644 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3645 | |
| 3646 | shutdown(info); |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 3647 | rs_flush_buffer(tty); |
Alan Cox | 454aa38 | 2008-05-12 12:31:37 +0100 | [diff] [blame] | 3648 | tty_ldisc_flush(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3649 | tty->closing = 0; |
| 3650 | info->event = 0; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 3651 | info->port.tty = NULL; |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3652 | if (info->port.blocked_open) { |
Jiri Slaby | 892c7cf | 2013-03-07 13:12:38 +0100 | [diff] [blame] | 3653 | if (info->port.close_delay) |
| 3654 | schedule_timeout_interruptible(info->port.close_delay); |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3655 | wake_up_interruptible(&info->port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3656 | } |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3657 | info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3658 | wake_up_interruptible(&info->port.close_wait); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3659 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3660 | |
| 3661 | /* port closed */ |
| 3662 | |
| 3663 | #if defined(CONFIG_ETRAX_RS485) |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 3664 | if (info->rs485.flags & SER_RS485_ENABLED) { |
| 3665 | info->rs485.flags &= ~(SER_RS485_ENABLED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3666 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 3667 | *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit); |
| 3668 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3669 | } |
| 3670 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3671 | |
| 3672 | /* |
| 3673 | * Release any allocated DMA irq's. |
| 3674 | */ |
| 3675 | if (info->dma_in_enabled) { |
| 3676 | free_irq(info->dma_in_irq_nbr, info); |
| 3677 | cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); |
| 3678 | info->uses_dma_in = 0; |
| 3679 | #ifdef SERIAL_DEBUG_OPEN |
| 3680 | printk(KERN_DEBUG "DMA irq '%s' freed\n", |
| 3681 | info->dma_in_irq_description); |
| 3682 | #endif |
| 3683 | } |
| 3684 | if (info->dma_out_enabled) { |
| 3685 | free_irq(info->dma_out_irq_nbr, info); |
| 3686 | cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); |
| 3687 | info->uses_dma_out = 0; |
| 3688 | #ifdef SERIAL_DEBUG_OPEN |
| 3689 | printk(KERN_DEBUG "DMA irq '%s' freed\n", |
| 3690 | info->dma_out_irq_description); |
| 3691 | #endif |
| 3692 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3693 | } |
| 3694 | |
| 3695 | /* |
| 3696 | * rs_wait_until_sent() --- wait until the transmitter is empty |
| 3697 | */ |
| 3698 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) |
| 3699 | { |
| 3700 | unsigned long orig_jiffies; |
| 3701 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3702 | unsigned long curr_time = jiffies; |
| 3703 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); |
| 3704 | long elapsed_usec = |
| 3705 | (curr_time - info->last_tx_active) * (1000000/HZ) + |
| 3706 | curr_time_usec - info->last_tx_active_usec; |
| 3707 | |
| 3708 | /* |
| 3709 | * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO |
| 3710 | * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k) |
| 3711 | */ |
| 3712 | orig_jiffies = jiffies; |
| 3713 | while (info->xmit.head != info->xmit.tail || /* More in send queue */ |
| 3714 | (*info->ostatusadr & 0x007f) || /* more in FIFO */ |
| 3715 | (elapsed_usec < 2*info->char_time_usec)) { |
Nishanth Aravamudan | 3c76bc5 | 2005-11-07 01:01:21 -0800 | [diff] [blame] | 3716 | schedule_timeout_interruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3717 | if (signal_pending(current)) |
| 3718 | break; |
| 3719 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 3720 | break; |
| 3721 | curr_time = jiffies; |
| 3722 | curr_time_usec = GET_JIFFIES_USEC(); |
| 3723 | elapsed_usec = |
| 3724 | (curr_time - info->last_tx_active) * (1000000/HZ) + |
| 3725 | curr_time_usec - info->last_tx_active_usec; |
| 3726 | } |
| 3727 | set_current_state(TASK_RUNNING); |
| 3728 | } |
| 3729 | |
| 3730 | /* |
| 3731 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 3732 | */ |
| 3733 | void |
| 3734 | rs_hangup(struct tty_struct *tty) |
| 3735 | { |
| 3736 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 3737 | |
| 3738 | rs_flush_buffer(tty); |
| 3739 | shutdown(info); |
| 3740 | info->event = 0; |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3741 | info->port.count = 0; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3742 | info->port.flags &= ~ASYNC_NORMAL_ACTIVE; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 3743 | info->port.tty = NULL; |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3744 | wake_up_interruptible(&info->port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3745 | } |
| 3746 | |
| 3747 | /* |
| 3748 | * ------------------------------------------------------------ |
| 3749 | * rs_open() and friends |
| 3750 | * ------------------------------------------------------------ |
| 3751 | */ |
| 3752 | static int |
| 3753 | block_til_ready(struct tty_struct *tty, struct file * filp, |
| 3754 | struct e100_serial *info) |
| 3755 | { |
| 3756 | DECLARE_WAITQUEUE(wait, current); |
| 3757 | unsigned long flags; |
| 3758 | int retval; |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3759 | int do_clocal = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3760 | |
| 3761 | /* |
| 3762 | * If the device is in the middle of being closed, then block |
| 3763 | * until it's done, and then try again. |
| 3764 | */ |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3765 | if (info->port.flags & ASYNC_CLOSING) { |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3766 | wait_event_interruptible_tty(tty, info->port.close_wait, |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3767 | !(info->port.flags & ASYNC_CLOSING)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3768 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3769 | if (info->port.flags & ASYNC_HUP_NOTIFY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3770 | return -EAGAIN; |
| 3771 | else |
| 3772 | return -ERESTARTSYS; |
| 3773 | #else |
| 3774 | return -EAGAIN; |
| 3775 | #endif |
| 3776 | } |
| 3777 | |
| 3778 | /* |
| 3779 | * If non-blocking mode is set, or the port is not enabled, |
| 3780 | * then make the check up front and then exit. |
| 3781 | */ |
| 3782 | if ((filp->f_flags & O_NONBLOCK) || |
| 3783 | (tty->flags & (1 << TTY_IO_ERROR))) { |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3784 | info->port.flags |= ASYNC_NORMAL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3785 | return 0; |
| 3786 | } |
| 3787 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 3788 | if (tty->termios.c_cflag & CLOCAL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3789 | do_clocal = 1; |
| 3790 | } |
| 3791 | |
| 3792 | /* |
| 3793 | * Block waiting for the carrier detect and the line to become |
| 3794 | * 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] | 3795 | * this loop, info->port.count is dropped by one, so that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3796 | * rs_close() knows when to free things. We restore it upon |
| 3797 | * exit, either normal or abnormal. |
| 3798 | */ |
| 3799 | retval = 0; |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3800 | add_wait_queue(&info->port.open_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3801 | #ifdef SERIAL_DEBUG_OPEN |
| 3802 | printk("block_til_ready before block: ttyS%d, count = %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3803 | info->line, info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3804 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3805 | local_irq_save(flags); |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3806 | info->port.count--; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3807 | local_irq_restore(flags); |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3808 | info->port.blocked_open++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3809 | while (1) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3810 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3811 | /* assert RTS and DTR */ |
| 3812 | e100_rts(info, 1); |
| 3813 | e100_dtr(info, 1); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3814 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3815 | set_current_state(TASK_INTERRUPTIBLE); |
| 3816 | if (tty_hung_up_p(filp) || |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3817 | !(info->port.flags & ASYNC_INITIALIZED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3818 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3819 | if (info->port.flags & ASYNC_HUP_NOTIFY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3820 | retval = -EAGAIN; |
| 3821 | else |
| 3822 | retval = -ERESTARTSYS; |
| 3823 | #else |
| 3824 | retval = -EAGAIN; |
| 3825 | #endif |
| 3826 | break; |
| 3827 | } |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3828 | if (!(info->port.flags & ASYNC_CLOSING) && do_clocal) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3829 | /* && (do_clocal || DCD_IS_ASSERTED) */ |
| 3830 | break; |
| 3831 | if (signal_pending(current)) { |
| 3832 | retval = -ERESTARTSYS; |
| 3833 | break; |
| 3834 | } |
| 3835 | #ifdef SERIAL_DEBUG_OPEN |
| 3836 | printk("block_til_ready blocking: ttyS%d, count = %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3837 | info->line, info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3838 | #endif |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 3839 | tty_unlock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3840 | schedule(); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 3841 | tty_lock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3842 | } |
| 3843 | set_current_state(TASK_RUNNING); |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3844 | remove_wait_queue(&info->port.open_wait, &wait); |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3845 | if (!tty_hung_up_p(filp)) |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3846 | info->port.count++; |
| 3847 | info->port.blocked_open--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3848 | #ifdef SERIAL_DEBUG_OPEN |
| 3849 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3850 | info->line, info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3851 | #endif |
| 3852 | if (retval) |
| 3853 | return retval; |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3854 | info->port.flags |= ASYNC_NORMAL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3855 | return 0; |
| 3856 | } |
| 3857 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3858 | static void |
| 3859 | deinit_port(struct e100_serial *info) |
| 3860 | { |
| 3861 | if (info->dma_out_enabled) { |
| 3862 | cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); |
| 3863 | free_irq(info->dma_out_irq_nbr, info); |
| 3864 | } |
| 3865 | if (info->dma_in_enabled) { |
| 3866 | cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); |
| 3867 | free_irq(info->dma_in_irq_nbr, info); |
| 3868 | } |
| 3869 | } |
| 3870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3871 | /* |
| 3872 | * This routine is called whenever a serial port is opened. |
| 3873 | * It performs the serial-specific initialization for the tty structure. |
| 3874 | */ |
| 3875 | static int |
| 3876 | rs_open(struct tty_struct *tty, struct file * filp) |
| 3877 | { |
| 3878 | struct e100_serial *info; |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 3879 | int retval; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3880 | int allocated_resources = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3881 | |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 3882 | info = rs_table + tty->index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3883 | if (!info->enabled) |
| 3884 | return -ENODEV; |
| 3885 | |
| 3886 | #ifdef SERIAL_DEBUG_OPEN |
| 3887 | printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name, |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3888 | info->port.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3889 | #endif |
| 3890 | |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3891 | info->port.count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3892 | tty->driver_data = info; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 3893 | info->port.tty = tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3894 | |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3895 | info->port.low_latency = !!(info->port.flags & ASYNC_LOW_LATENCY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3897 | /* |
| 3898 | * If the port is in the middle of closing, bail out now |
| 3899 | */ |
Peter Hurley | e359a4e | 2014-06-16 09:17:06 -0400 | [diff] [blame] | 3900 | if (info->port.flags & ASYNC_CLOSING) { |
Jiri Slaby | 4aeaeb0 | 2013-03-07 13:12:39 +0100 | [diff] [blame] | 3901 | wait_event_interruptible_tty(tty, info->port.close_wait, |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3902 | !(info->port.flags & ASYNC_CLOSING)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3903 | #ifdef SERIAL_DO_RESTART |
Jiri Slaby | b1d984c | 2013-03-07 13:12:36 +0100 | [diff] [blame] | 3904 | return ((info->port.flags & ASYNC_HUP_NOTIFY) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3905 | -EAGAIN : -ERESTARTSYS); |
| 3906 | #else |
| 3907 | return -EAGAIN; |
| 3908 | #endif |
| 3909 | } |
| 3910 | |
| 3911 | /* |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3912 | * If DMA is enabled try to allocate the irq's. |
| 3913 | */ |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3914 | if (info->port.count == 1) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3915 | allocated_resources = 1; |
| 3916 | if (info->dma_in_enabled) { |
| 3917 | if (request_irq(info->dma_in_irq_nbr, |
| 3918 | rec_interrupt, |
| 3919 | info->dma_in_irq_flags, |
| 3920 | info->dma_in_irq_description, |
| 3921 | info)) { |
| 3922 | printk(KERN_WARNING "DMA irq '%s' busy; " |
| 3923 | "falling back to non-DMA mode\n", |
| 3924 | info->dma_in_irq_description); |
| 3925 | /* Make sure we never try to use DMA in */ |
| 3926 | /* for the port again. */ |
| 3927 | info->dma_in_enabled = 0; |
| 3928 | } else if (cris_request_dma(info->dma_in_nbr, |
| 3929 | info->dma_in_irq_description, |
| 3930 | DMA_VERBOSE_ON_ERROR, |
| 3931 | info->dma_owner)) { |
| 3932 | free_irq(info->dma_in_irq_nbr, info); |
| 3933 | printk(KERN_WARNING "DMA '%s' busy; " |
| 3934 | "falling back to non-DMA mode\n", |
| 3935 | info->dma_in_irq_description); |
| 3936 | /* Make sure we never try to use DMA in */ |
| 3937 | /* for the port again. */ |
| 3938 | info->dma_in_enabled = 0; |
| 3939 | } |
| 3940 | #ifdef SERIAL_DEBUG_OPEN |
| 3941 | else |
| 3942 | printk(KERN_DEBUG "DMA irq '%s' allocated\n", |
| 3943 | info->dma_in_irq_description); |
| 3944 | #endif |
| 3945 | } |
| 3946 | if (info->dma_out_enabled) { |
| 3947 | if (request_irq(info->dma_out_irq_nbr, |
| 3948 | tr_interrupt, |
| 3949 | info->dma_out_irq_flags, |
| 3950 | info->dma_out_irq_description, |
| 3951 | info)) { |
| 3952 | printk(KERN_WARNING "DMA irq '%s' busy; " |
| 3953 | "falling back to non-DMA mode\n", |
| 3954 | info->dma_out_irq_description); |
| 3955 | /* Make sure we never try to use DMA out */ |
| 3956 | /* for the port again. */ |
| 3957 | info->dma_out_enabled = 0; |
| 3958 | } else if (cris_request_dma(info->dma_out_nbr, |
| 3959 | info->dma_out_irq_description, |
| 3960 | DMA_VERBOSE_ON_ERROR, |
| 3961 | info->dma_owner)) { |
| 3962 | free_irq(info->dma_out_irq_nbr, info); |
| 3963 | printk(KERN_WARNING "DMA '%s' busy; " |
| 3964 | "falling back to non-DMA mode\n", |
| 3965 | info->dma_out_irq_description); |
| 3966 | /* Make sure we never try to use DMA out */ |
| 3967 | /* for the port again. */ |
| 3968 | info->dma_out_enabled = 0; |
| 3969 | } |
| 3970 | #ifdef SERIAL_DEBUG_OPEN |
| 3971 | else |
| 3972 | printk(KERN_DEBUG "DMA irq '%s' allocated\n", |
| 3973 | info->dma_out_irq_description); |
| 3974 | #endif |
| 3975 | } |
| 3976 | } |
| 3977 | |
| 3978 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3979 | * Start up the serial port |
| 3980 | */ |
| 3981 | |
| 3982 | retval = startup(info); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3983 | if (retval) { |
| 3984 | if (allocated_resources) |
| 3985 | deinit_port(info); |
| 3986 | |
Jiri Slaby | b12d8dc | 2013-03-07 13:12:40 +0100 | [diff] [blame] | 3987 | /* FIXME Decrease count info->port.count here too? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3988 | return retval; |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3989 | } |
| 3990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3991 | |
| 3992 | retval = block_til_ready(tty, filp, info); |
| 3993 | if (retval) { |
| 3994 | #ifdef SERIAL_DEBUG_OPEN |
| 3995 | printk("rs_open returning after block_til_ready with %d\n", |
| 3996 | retval); |
| 3997 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 3998 | if (allocated_resources) |
| 3999 | deinit_port(info); |
| 4000 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4001 | return retval; |
| 4002 | } |
| 4003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4004 | #ifdef SERIAL_DEBUG_OPEN |
| 4005 | printk("rs_open ttyS%d successful...\n", info->line); |
| 4006 | #endif |
| 4007 | DLOG_INT_TRIG( log_int_pos = 0); |
| 4008 | |
| 4009 | DFLIP( if (info->line == SERIAL_DEBUG_LINE) { |
| 4010 | info->icount.rx = 0; |
| 4011 | } ); |
| 4012 | |
| 4013 | return 0; |
| 4014 | } |
| 4015 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4016 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4017 | /* |
| 4018 | * /proc fs routines.... |
| 4019 | */ |
| 4020 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4021 | 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] | 4022 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4023 | unsigned long tmp; |
| 4024 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4025 | seq_printf(m, "%d: uart:E100 port:%lX irq:%d", |
| 4026 | info->line, (unsigned long)info->ioport, info->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4027 | |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 4028 | if (!info->ioport || (info->type == PORT_UNKNOWN)) { |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4029 | seq_printf(m, "\n"); |
| 4030 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4031 | } |
| 4032 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4033 | seq_printf(m, " baud:%d", info->baud); |
| 4034 | seq_printf(m, " tx:%lu rx:%lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4035 | (unsigned long)info->icount.tx, |
| 4036 | (unsigned long)info->icount.rx); |
| 4037 | tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4038 | if (tmp) |
| 4039 | seq_printf(m, " tx_pend:%lu/%lu", |
| 4040 | (unsigned long)tmp, |
| 4041 | (unsigned long)SERIAL_XMIT_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4042 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4043 | seq_printf(m, " rx_pend:%lu/%lu", |
| 4044 | (unsigned long)info->recv_cnt, |
| 4045 | (unsigned long)info->max_recv_cnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4046 | |
| 4047 | #if 1 |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 4048 | if (info->port.tty) { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 4049 | if (info->port.tty->stopped) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4050 | seq_printf(m, " stopped:%i", |
| 4051 | (int)info->port.tty->stopped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4052 | } |
| 4053 | |
| 4054 | { |
Alan Cox | d728335 | 2008-08-04 17:21:18 +0100 | [diff] [blame] | 4055 | unsigned char rstat = info->ioport[REG_STATUS]; |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4056 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect)) |
| 4057 | seq_printf(m, " xoff_detect:1"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4058 | } |
| 4059 | |
| 4060 | #endif |
| 4061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4062 | if (info->icount.frame) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4063 | seq_printf(m, " fe:%lu", (unsigned long)info->icount.frame); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4064 | |
| 4065 | if (info->icount.parity) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4066 | seq_printf(m, " pe:%lu", (unsigned long)info->icount.parity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4067 | |
| 4068 | if (info->icount.brk) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4069 | seq_printf(m, " brk:%lu", (unsigned long)info->icount.brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4070 | |
| 4071 | if (info->icount.overrun) |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4072 | seq_printf(m, " oe:%lu", (unsigned long)info->icount.overrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4073 | |
| 4074 | /* |
| 4075 | * Last thing is the RS-232 status lines |
| 4076 | */ |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4077 | if (!E100_RTS_GET(info)) |
| 4078 | seq_puts(m, "|RTS"); |
| 4079 | if (!E100_CTS_GET(info)) |
| 4080 | seq_puts(m, "|CTS"); |
| 4081 | if (!E100_DTR_GET(info)) |
| 4082 | seq_puts(m, "|DTR"); |
| 4083 | if (!E100_DSR_GET(info)) |
| 4084 | seq_puts(m, "|DSR"); |
| 4085 | if (!E100_CD_GET(info)) |
| 4086 | seq_puts(m, "|CD"); |
| 4087 | if (!E100_RI_GET(info)) |
| 4088 | seq_puts(m, "|RI"); |
| 4089 | seq_puts(m, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4090 | } |
| 4091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4092 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4093 | static int crisv10_proc_show(struct seq_file *m, void *v) |
| 4094 | { |
| 4095 | int i; |
| 4096 | |
| 4097 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
| 4098 | |
| 4099 | for (i = 0; i < NR_PORTS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4100 | if (!rs_table[i].enabled) |
| 4101 | continue; |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4102 | seq_line_info(m, &rs_table[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4103 | } |
| 4104 | #ifdef DEBUG_LOG_INCLUDED |
| 4105 | for (i = 0; i < debug_log_pos; i++) { |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4106 | seq_printf(m, "%-4i %lu.%lu ", |
| 4107 | i, debug_log[i].time, |
| 4108 | timer_data_to_ns(debug_log[i].timer_data)); |
| 4109 | seq_printf(m, debug_log[i].string, debug_log[i].value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4110 | } |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4111 | seq_printf(m, "debug_log %i/%i\n", i, DEBUG_LOG_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4112 | debug_log_pos = 0; |
| 4113 | #endif |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4114 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4115 | } |
| 4116 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4117 | static int crisv10_proc_open(struct inode *inode, struct file *file) |
| 4118 | { |
| 4119 | return single_open(file, crisv10_proc_show, NULL); |
| 4120 | } |
| 4121 | |
| 4122 | static const struct file_operations crisv10_proc_fops = { |
| 4123 | .owner = THIS_MODULE, |
| 4124 | .open = crisv10_proc_open, |
| 4125 | .read = seq_read, |
| 4126 | .llseek = seq_lseek, |
| 4127 | .release = single_release, |
| 4128 | }; |
| 4129 | #endif |
| 4130 | |
| 4131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4132 | /* Finally, routines used to initialize the serial driver. */ |
| 4133 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4134 | static void show_serial_version(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4135 | { |
| 4136 | printk(KERN_INFO |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4137 | "ETRAX 100LX serial-driver %s, " |
| 4138 | "(c) 2000-2004 Axis Communications AB\r\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4139 | &serial_version[11]); /* "$Revision: x.yy" */ |
| 4140 | } |
| 4141 | |
| 4142 | /* rs_init inits the driver at boot (using the module_init chain) */ |
| 4143 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 4144 | static const struct tty_operations rs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4145 | .open = rs_open, |
| 4146 | .close = rs_close, |
| 4147 | .write = rs_write, |
| 4148 | .flush_chars = rs_flush_chars, |
| 4149 | .write_room = rs_write_room, |
| 4150 | .chars_in_buffer = rs_chars_in_buffer, |
| 4151 | .flush_buffer = rs_flush_buffer, |
| 4152 | .ioctl = rs_ioctl, |
| 4153 | .throttle = rs_throttle, |
| 4154 | .unthrottle = rs_unthrottle, |
| 4155 | .set_termios = rs_set_termios, |
| 4156 | .stop = rs_stop, |
| 4157 | .start = rs_start, |
| 4158 | .hangup = rs_hangup, |
| 4159 | .break_ctl = rs_break, |
| 4160 | .send_xchar = rs_send_xchar, |
| 4161 | .wait_until_sent = rs_wait_until_sent, |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4162 | .tiocmget = rs_tiocmget, |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4163 | .tiocmset = rs_tiocmset, |
| 4164 | #ifdef CONFIG_PROC_FS |
| 4165 | .proc_fops = &crisv10_proc_fops, |
| 4166 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4167 | }; |
| 4168 | |
Jesper Nilsson | 9e040a3 | 2009-04-30 15:08:13 -0700 | [diff] [blame] | 4169 | static int __init rs_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4170 | { |
| 4171 | int i; |
| 4172 | struct e100_serial *info; |
| 4173 | struct tty_driver *driver = alloc_tty_driver(NR_PORTS); |
| 4174 | |
| 4175 | if (!driver) |
| 4176 | return -ENOMEM; |
| 4177 | |
| 4178 | show_serial_version(); |
| 4179 | |
| 4180 | /* Setup the timed flush handler system */ |
| 4181 | |
| 4182 | #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER) |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4183 | setup_timer(&flush_timer, timed_flush_handler, 0); |
| 4184 | mod_timer(&flush_timer, jiffies + 5); |
| 4185 | #endif |
| 4186 | |
| 4187 | #if defined(CONFIG_ETRAX_RS485) |
| 4188 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
WANG Cong | 2f7861d | 2011-09-01 13:58:29 +0800 | [diff] [blame] | 4189 | 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] | 4190 | rs485_pa_bit)) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 4191 | printk(KERN_ERR "ETRAX100LX serial: Could not allocate " |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4192 | "RS485 pin\n"); |
Julia Lawall | 41ca732 | 2008-10-13 10:31:37 +0100 | [diff] [blame] | 4193 | put_tty_driver(driver); |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4194 | return -EBUSY; |
| 4195 | } |
| 4196 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4197 | #endif |
| 4198 | |
| 4199 | /* Initialize the tty_driver structure */ |
| 4200 | |
| 4201 | driver->driver_name = "serial"; |
| 4202 | driver->name = "ttyS"; |
| 4203 | driver->major = TTY_MAJOR; |
| 4204 | driver->minor_start = 64; |
| 4205 | driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 4206 | driver->subtype = SERIAL_TYPE_NORMAL; |
| 4207 | driver->init_termios = tty_std_termios; |
| 4208 | driver->init_termios.c_cflag = |
| 4209 | B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */ |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 4210 | driver->init_termios.c_ispeed = 115200; |
| 4211 | driver->init_termios.c_ospeed = 115200; |
Jiri Slaby | c4d6ebe | 2012-08-07 21:47:48 +0200 | [diff] [blame] | 4212 | driver->flags = TTY_DRIVER_REAL_RAW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4213 | |
| 4214 | tty_set_operations(driver, &rs_ops); |
| 4215 | serial_driver = driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4216 | |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 4217 | /* do some initializing for the separate ports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4218 | for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) { |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4219 | if (info->enabled) { |
| 4220 | if (cris_request_io_interface(info->io_if, |
| 4221 | info->io_if_description)) { |
WANG Cong | 3d43b7d | 2011-09-01 16:47:49 +0800 | [diff] [blame] | 4222 | printk(KERN_ERR "ETRAX100LX async serial: " |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4223 | "Could not allocate IO pins for " |
| 4224 | "%s, port %d\n", |
| 4225 | info->io_if_description, i); |
| 4226 | info->enabled = 0; |
| 4227 | } |
| 4228 | } |
Jiri Slaby | 953756e | 2012-04-02 13:53:46 +0200 | [diff] [blame] | 4229 | tty_port_init(&info->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4230 | info->uses_dma_in = 0; |
| 4231 | info->uses_dma_out = 0; |
| 4232 | info->line = i; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 4233 | info->port.tty = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4234 | info->type = PORT_ETRAX; |
| 4235 | info->tr_running = 0; |
| 4236 | info->forced_eop = 0; |
| 4237 | info->baud_base = DEF_BAUD_BASE; |
| 4238 | info->custom_divisor = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4239 | info->x_char = 0; |
| 4240 | info->event = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4241 | info->xmit.buf = NULL; |
| 4242 | info->xmit.tail = info->xmit.head = 0; |
| 4243 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 4244 | info->recv_cnt = info->max_recv_cnt = 0; |
| 4245 | info->last_tx_active_usec = 0; |
| 4246 | info->last_tx_active = 0; |
| 4247 | |
| 4248 | #if defined(CONFIG_ETRAX_RS485) |
| 4249 | /* Set sane defaults */ |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 4250 | info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND); |
| 4251 | info->rs485.flags |= SER_RS485_RTS_AFTER_SEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4252 | info->rs485.delay_rts_before_send = 0; |
Claudio Scordino | 6fd1af4 | 2009-04-07 16:48:19 +0100 | [diff] [blame] | 4253 | info->rs485.flags &= ~(SER_RS485_ENABLED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4254 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4255 | INIT_WORK(&info->work, do_softint); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4256 | |
| 4257 | if (info->enabled) { |
Kulikov Vasiliy | 078dee2 | 2010-07-14 22:04:42 +0400 | [diff] [blame] | 4258 | printk(KERN_INFO "%s%d at %p is a builtin UART with DMA\n", |
| 4259 | serial_driver->name, info->line, info->ioport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4260 | } |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 4261 | tty_port_link_device(&info->port, driver, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4262 | } |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 4263 | |
| 4264 | if (tty_register_driver(driver)) |
| 4265 | panic("Couldn't register serial driver\n"); |
| 4266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4267 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 4268 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 4269 | memset(fast_timers, 0, sizeof(fast_timers)); |
| 4270 | #endif |
| 4271 | #ifdef CONFIG_ETRAX_RS485 |
| 4272 | memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485)); |
| 4273 | #endif |
| 4274 | fast_timer_init(); |
| 4275 | #endif |
| 4276 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4277 | #ifndef CONFIG_ETRAX_KGDB |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4278 | /* Not needed in simulator. May only complicate stuff. */ |
| 4279 | /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */ |
| 4280 | |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4281 | if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 4282 | IRQF_SHARED, "serial ", driver)) |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 4283 | panic("%s: Failed to request irq8", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4285 | #endif |
Jesper Nilsson | 77accbf | 2007-11-14 17:01:15 -0800 | [diff] [blame] | 4286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4287 | return 0; |
| 4288 | } |
| 4289 | |
| 4290 | /* this makes sure that rs_init is called during kernel boot */ |
| 4291 | |
| 4292 | module_init(rs_init); |