Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/serial/serial_txx9.c |
| 3 | * |
| 4 | * Derived from many drivers using generic_serial interface, |
| 5 | * especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c |
| 6 | * (was in Linux/VR tree) by Jim Pick. |
| 7 | * |
| 8 | * Copyright (C) 1999 Harald Koerfgen |
| 9 | * Copyright (C) 2000 Jim Pick <jim@jimpick.com> |
| 10 | * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com) |
| 11 | * Copyright (C) 2000-2002 Toshiba Corporation |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License version 2 as |
| 15 | * published by the Free Software Foundation. |
| 16 | * |
| 17 | * Serial driver for TX3927/TX4927/TX4925/TX4938 internal SIO controller |
| 18 | * |
| 19 | * Revision History: |
| 20 | * 0.30 Initial revision. (Renamed from serial_txx927.c) |
| 21 | * 0.31 Use save_flags instead of local_irq_save. |
| 22 | * 0.32 Support SCLK. |
| 23 | * 0.33 Switch TXX9_TTY_NAME by CONFIG_SERIAL_TXX9_STDSERIAL. |
| 24 | * Support TIOCSERGETLSR. |
| 25 | * 0.34 Support slow baudrate. |
| 26 | * 0.40 Merge codes from mainstream kernel (2.4.22). |
| 27 | * 0.41 Fix console checking in rs_shutdown_port(). |
| 28 | * Disable flow-control in serial_console_write(). |
| 29 | * 0.42 Fix minor compiler warning. |
| 30 | * 1.00 Kernel 2.6. Converted to new serial core (based on 8250.c). |
| 31 | * 1.01 Set fifosize to make tx_empry called properly. |
| 32 | * Use standard uart_get_divisor. |
| 33 | * 1.02 Cleanup. (import 8250.c changes) |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 34 | * 1.03 Fix low-latency mode. (import 8250.c changes) |
| 35 | * 1.04 Remove usage of deprecated functions, cleanup. |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 36 | * 1.05 More strict check in verify_port. Cleanup. |
| 37 | * 1.06 Do not insert a char caused previous overrun. |
| 38 | * Fix some spin_locks. |
| 39 | * Do not call uart_add_one_port for absent ports. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | #if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 43 | #define SUPPORT_SYSRQ |
| 44 | #endif |
| 45 | |
| 46 | #include <linux/module.h> |
| 47 | #include <linux/ioport.h> |
| 48 | #include <linux/init.h> |
| 49 | #include <linux/console.h> |
| 50 | #include <linux/sysrq.h> |
| 51 | #include <linux/delay.h> |
| 52 | #include <linux/device.h> |
| 53 | #include <linux/pci.h> |
| 54 | #include <linux/tty.h> |
| 55 | #include <linux/tty_flip.h> |
| 56 | #include <linux/serial_core.h> |
| 57 | #include <linux/serial.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 58 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #include <asm/io.h> |
| 61 | #include <asm/irq.h> |
| 62 | |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 63 | static char *serial_version = "1.06"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | static char *serial_name = "TX39/49 Serial driver"; |
| 65 | |
| 66 | #define PASS_LIMIT 256 |
| 67 | |
| 68 | #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL) |
| 69 | /* "ttyS" is used for standard serial driver */ |
| 70 | #define TXX9_TTY_NAME "ttyTX" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #define TXX9_TTY_MINOR_START (64 + 64) /* ttyTX0(128), ttyTX1(129) */ |
| 72 | #else |
| 73 | /* acts like standard serial driver */ |
| 74 | #define TXX9_TTY_NAME "ttyS" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #define TXX9_TTY_MINOR_START 64 |
| 76 | #endif |
| 77 | #define TXX9_TTY_MAJOR TTY_MAJOR |
| 78 | |
| 79 | /* flag aliases */ |
| 80 | #define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART |
| 81 | #define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER |
| 82 | |
| 83 | #ifdef CONFIG_PCI |
| 84 | /* support for Toshiba TC86C001 SIO */ |
| 85 | #define ENABLE_SERIAL_TXX9_PCI |
| 86 | #endif |
| 87 | |
| 88 | /* |
| 89 | * Number of serial ports |
| 90 | */ |
| 91 | #ifdef ENABLE_SERIAL_TXX9_PCI |
| 92 | #define NR_PCI_BOARDS 4 |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 93 | #define UART_NR (4 + NR_PCI_BOARDS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #else |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 95 | #define UART_NR 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #endif |
| 97 | |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 98 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | struct uart_txx9_port { |
| 101 | struct uart_port port; |
| 102 | |
| 103 | /* |
| 104 | * We provide a per-port pm hook. |
| 105 | */ |
| 106 | void (*pm)(struct uart_port *port, |
| 107 | unsigned int state, unsigned int old); |
| 108 | }; |
| 109 | |
| 110 | #define TXX9_REGION_SIZE 0x24 |
| 111 | |
| 112 | /* TXX9 Serial Registers */ |
| 113 | #define TXX9_SILCR 0x00 |
| 114 | #define TXX9_SIDICR 0x04 |
| 115 | #define TXX9_SIDISR 0x08 |
| 116 | #define TXX9_SICISR 0x0c |
| 117 | #define TXX9_SIFCR 0x10 |
| 118 | #define TXX9_SIFLCR 0x14 |
| 119 | #define TXX9_SIBGR 0x18 |
| 120 | #define TXX9_SITFIFO 0x1c |
| 121 | #define TXX9_SIRFIFO 0x20 |
| 122 | |
| 123 | /* SILCR : Line Control */ |
| 124 | #define TXX9_SILCR_SCS_MASK 0x00000060 |
| 125 | #define TXX9_SILCR_SCS_IMCLK 0x00000000 |
| 126 | #define TXX9_SILCR_SCS_IMCLK_BG 0x00000020 |
| 127 | #define TXX9_SILCR_SCS_SCLK 0x00000040 |
| 128 | #define TXX9_SILCR_SCS_SCLK_BG 0x00000060 |
| 129 | #define TXX9_SILCR_UEPS 0x00000010 |
| 130 | #define TXX9_SILCR_UPEN 0x00000008 |
| 131 | #define TXX9_SILCR_USBL_MASK 0x00000004 |
| 132 | #define TXX9_SILCR_USBL_1BIT 0x00000000 |
| 133 | #define TXX9_SILCR_USBL_2BIT 0x00000004 |
| 134 | #define TXX9_SILCR_UMODE_MASK 0x00000003 |
| 135 | #define TXX9_SILCR_UMODE_8BIT 0x00000000 |
| 136 | #define TXX9_SILCR_UMODE_7BIT 0x00000001 |
| 137 | |
| 138 | /* SIDICR : DMA/Int. Control */ |
| 139 | #define TXX9_SIDICR_TDE 0x00008000 |
| 140 | #define TXX9_SIDICR_RDE 0x00004000 |
| 141 | #define TXX9_SIDICR_TIE 0x00002000 |
| 142 | #define TXX9_SIDICR_RIE 0x00001000 |
| 143 | #define TXX9_SIDICR_SPIE 0x00000800 |
| 144 | #define TXX9_SIDICR_CTSAC 0x00000600 |
| 145 | #define TXX9_SIDICR_STIE_MASK 0x0000003f |
| 146 | #define TXX9_SIDICR_STIE_OERS 0x00000020 |
| 147 | #define TXX9_SIDICR_STIE_CTSS 0x00000010 |
| 148 | #define TXX9_SIDICR_STIE_RBRKD 0x00000008 |
| 149 | #define TXX9_SIDICR_STIE_TRDY 0x00000004 |
| 150 | #define TXX9_SIDICR_STIE_TXALS 0x00000002 |
| 151 | #define TXX9_SIDICR_STIE_UBRKD 0x00000001 |
| 152 | |
| 153 | /* SIDISR : DMA/Int. Status */ |
| 154 | #define TXX9_SIDISR_UBRK 0x00008000 |
| 155 | #define TXX9_SIDISR_UVALID 0x00004000 |
| 156 | #define TXX9_SIDISR_UFER 0x00002000 |
| 157 | #define TXX9_SIDISR_UPER 0x00001000 |
| 158 | #define TXX9_SIDISR_UOER 0x00000800 |
| 159 | #define TXX9_SIDISR_ERI 0x00000400 |
| 160 | #define TXX9_SIDISR_TOUT 0x00000200 |
| 161 | #define TXX9_SIDISR_TDIS 0x00000100 |
| 162 | #define TXX9_SIDISR_RDIS 0x00000080 |
| 163 | #define TXX9_SIDISR_STIS 0x00000040 |
| 164 | #define TXX9_SIDISR_RFDN_MASK 0x0000001f |
| 165 | |
| 166 | /* SICISR : Change Int. Status */ |
| 167 | #define TXX9_SICISR_OERS 0x00000020 |
| 168 | #define TXX9_SICISR_CTSS 0x00000010 |
| 169 | #define TXX9_SICISR_RBRKD 0x00000008 |
| 170 | #define TXX9_SICISR_TRDY 0x00000004 |
| 171 | #define TXX9_SICISR_TXALS 0x00000002 |
| 172 | #define TXX9_SICISR_UBRKD 0x00000001 |
| 173 | |
| 174 | /* SIFCR : FIFO Control */ |
| 175 | #define TXX9_SIFCR_SWRST 0x00008000 |
| 176 | #define TXX9_SIFCR_RDIL_MASK 0x00000180 |
| 177 | #define TXX9_SIFCR_RDIL_1 0x00000000 |
| 178 | #define TXX9_SIFCR_RDIL_4 0x00000080 |
| 179 | #define TXX9_SIFCR_RDIL_8 0x00000100 |
| 180 | #define TXX9_SIFCR_RDIL_12 0x00000180 |
| 181 | #define TXX9_SIFCR_RDIL_MAX 0x00000180 |
| 182 | #define TXX9_SIFCR_TDIL_MASK 0x00000018 |
| 183 | #define TXX9_SIFCR_TDIL_MASK 0x00000018 |
| 184 | #define TXX9_SIFCR_TDIL_1 0x00000000 |
| 185 | #define TXX9_SIFCR_TDIL_4 0x00000001 |
| 186 | #define TXX9_SIFCR_TDIL_8 0x00000010 |
| 187 | #define TXX9_SIFCR_TDIL_MAX 0x00000010 |
| 188 | #define TXX9_SIFCR_TFRST 0x00000004 |
| 189 | #define TXX9_SIFCR_RFRST 0x00000002 |
| 190 | #define TXX9_SIFCR_FRSTE 0x00000001 |
| 191 | #define TXX9_SIO_TX_FIFO 8 |
| 192 | #define TXX9_SIO_RX_FIFO 16 |
| 193 | |
| 194 | /* SIFLCR : Flow Control */ |
| 195 | #define TXX9_SIFLCR_RCS 0x00001000 |
| 196 | #define TXX9_SIFLCR_TES 0x00000800 |
| 197 | #define TXX9_SIFLCR_RTSSC 0x00000200 |
| 198 | #define TXX9_SIFLCR_RSDE 0x00000100 |
| 199 | #define TXX9_SIFLCR_TSDE 0x00000080 |
| 200 | #define TXX9_SIFLCR_RTSTL_MASK 0x0000001e |
| 201 | #define TXX9_SIFLCR_RTSTL_MAX 0x0000001e |
| 202 | #define TXX9_SIFLCR_TBRK 0x00000001 |
| 203 | |
| 204 | /* SIBGR : Baudrate Control */ |
| 205 | #define TXX9_SIBGR_BCLK_MASK 0x00000300 |
| 206 | #define TXX9_SIBGR_BCLK_T0 0x00000000 |
| 207 | #define TXX9_SIBGR_BCLK_T2 0x00000100 |
| 208 | #define TXX9_SIBGR_BCLK_T4 0x00000200 |
| 209 | #define TXX9_SIBGR_BCLK_T6 0x00000300 |
| 210 | #define TXX9_SIBGR_BRD_MASK 0x000000ff |
| 211 | |
| 212 | static inline unsigned int sio_in(struct uart_txx9_port *up, int offset) |
| 213 | { |
| 214 | switch (up->port.iotype) { |
| 215 | default: |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 216 | return __raw_readl(up->port.membase + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | case UPIO_PORT: |
| 218 | return inl(up->port.iobase + offset); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | static inline void |
| 223 | sio_out(struct uart_txx9_port *up, int offset, int value) |
| 224 | { |
| 225 | switch (up->port.iotype) { |
| 226 | default: |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 227 | __raw_writel(value, up->port.membase + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | break; |
| 229 | case UPIO_PORT: |
| 230 | outl(value, up->port.iobase + offset); |
| 231 | break; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | static inline void |
| 236 | sio_mask(struct uart_txx9_port *up, int offset, unsigned int value) |
| 237 | { |
| 238 | sio_out(up, offset, sio_in(up, offset) & ~value); |
| 239 | } |
| 240 | static inline void |
| 241 | sio_set(struct uart_txx9_port *up, int offset, unsigned int value) |
| 242 | { |
| 243 | sio_out(up, offset, sio_in(up, offset) | value); |
| 244 | } |
| 245 | |
| 246 | static inline void |
| 247 | sio_quot_set(struct uart_txx9_port *up, int quot) |
| 248 | { |
| 249 | quot >>= 1; |
| 250 | if (quot < 256) |
| 251 | sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0); |
| 252 | else if (quot < (256 << 2)) |
| 253 | sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2); |
| 254 | else if (quot < (256 << 4)) |
| 255 | sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4); |
| 256 | else if (quot < (256 << 6)) |
| 257 | sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6); |
| 258 | else |
| 259 | sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6); |
| 260 | } |
| 261 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 262 | static void serial_txx9_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 268 | static void serial_txx9_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
| 270 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | static void serial_txx9_stop_rx(struct uart_port *port) |
| 275 | { |
| 276 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | up->port.read_status_mask &= ~TXX9_SIDISR_RDIS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static void serial_txx9_enable_ms(struct uart_port *port) |
| 281 | { |
| 282 | /* TXX9-SIO can not control DTR... */ |
| 283 | } |
| 284 | |
| 285 | static inline void |
| 286 | receive_chars(struct uart_txx9_port *up, unsigned int *status, struct pt_regs *regs) |
| 287 | { |
| 288 | struct tty_struct *tty = up->port.info->tty; |
| 289 | unsigned char ch; |
| 290 | unsigned int disr = *status; |
| 291 | int max_count = 256; |
| 292 | char flag; |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 293 | unsigned int next_ignore_status_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
| 295 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | ch = sio_in(up, TXX9_SIRFIFO); |
| 297 | flag = TTY_NORMAL; |
| 298 | up->port.icount.rx++; |
| 299 | |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 300 | /* mask out RFDN_MASK bit added by previous overrun */ |
| 301 | next_ignore_status_mask = |
| 302 | up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER | |
| 304 | TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) { |
| 305 | /* |
| 306 | * For statistics only |
| 307 | */ |
| 308 | if (disr & TXX9_SIDISR_UBRK) { |
| 309 | disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER); |
| 310 | up->port.icount.brk++; |
| 311 | /* |
| 312 | * We do the SysRQ and SAK checking |
| 313 | * here because otherwise the break |
| 314 | * may get masked by ignore_status_mask |
| 315 | * or read_status_mask. |
| 316 | */ |
| 317 | if (uart_handle_break(&up->port)) |
| 318 | goto ignore_char; |
| 319 | } else if (disr & TXX9_SIDISR_UPER) |
| 320 | up->port.icount.parity++; |
| 321 | else if (disr & TXX9_SIDISR_UFER) |
| 322 | up->port.icount.frame++; |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 323 | if (disr & TXX9_SIDISR_UOER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | up->port.icount.overrun++; |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 325 | /* |
| 326 | * The receiver read buffer still hold |
| 327 | * a char which caused overrun. |
| 328 | * Ignore next char by adding RFDN_MASK |
| 329 | * to ignore_status_mask temporarily. |
| 330 | */ |
| 331 | next_ignore_status_mask |= |
| 332 | TXX9_SIDISR_RFDN_MASK; |
| 333 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
| 335 | /* |
| 336 | * Mask off conditions which should be ingored. |
| 337 | */ |
| 338 | disr &= up->port.read_status_mask; |
| 339 | |
| 340 | if (disr & TXX9_SIDISR_UBRK) { |
| 341 | flag = TTY_BREAK; |
| 342 | } else if (disr & TXX9_SIDISR_UPER) |
| 343 | flag = TTY_PARITY; |
| 344 | else if (disr & TXX9_SIDISR_UFER) |
| 345 | flag = TTY_FRAME; |
| 346 | } |
| 347 | if (uart_handle_sysrq_char(&up->port, ch, regs)) |
| 348 | goto ignore_char; |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 349 | |
| 350 | uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag); |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | ignore_char: |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 353 | up->port.ignore_status_mask = next_ignore_status_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | disr = sio_in(up, TXX9_SIDISR); |
| 355 | } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0)); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 356 | spin_unlock(&up->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | tty_flip_buffer_push(tty); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 358 | spin_lock(&up->port.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | *status = disr; |
| 360 | } |
| 361 | |
| 362 | static inline void transmit_chars(struct uart_txx9_port *up) |
| 363 | { |
| 364 | struct circ_buf *xmit = &up->port.info->xmit; |
| 365 | int count; |
| 366 | |
| 367 | if (up->port.x_char) { |
| 368 | sio_out(up, TXX9_SITFIFO, up->port.x_char); |
| 369 | up->port.icount.tx++; |
| 370 | up->port.x_char = 0; |
| 371 | return; |
| 372 | } |
| 373 | if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 374 | serial_txx9_stop_tx(&up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | return; |
| 376 | } |
| 377 | |
| 378 | count = TXX9_SIO_TX_FIFO; |
| 379 | do { |
| 380 | sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]); |
| 381 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 382 | up->port.icount.tx++; |
| 383 | if (uart_circ_empty(xmit)) |
| 384 | break; |
| 385 | } while (--count > 0); |
| 386 | |
| 387 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 388 | uart_write_wakeup(&up->port); |
| 389 | |
| 390 | if (uart_circ_empty(xmit)) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 391 | serial_txx9_stop_tx(&up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 395 | { |
| 396 | int pass_counter = 0; |
| 397 | struct uart_txx9_port *up = dev_id; |
| 398 | unsigned int status; |
| 399 | |
| 400 | while (1) { |
| 401 | spin_lock(&up->port.lock); |
| 402 | status = sio_in(up, TXX9_SIDISR); |
| 403 | if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE)) |
| 404 | status &= ~TXX9_SIDISR_TDIS; |
| 405 | if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS | |
| 406 | TXX9_SIDISR_TOUT))) { |
| 407 | spin_unlock(&up->port.lock); |
| 408 | break; |
| 409 | } |
| 410 | |
| 411 | if (status & TXX9_SIDISR_RDIS) |
| 412 | receive_chars(up, &status, regs); |
| 413 | if (status & TXX9_SIDISR_TDIS) |
| 414 | transmit_chars(up); |
| 415 | /* Clear TX/RX Int. Status */ |
| 416 | sio_mask(up, TXX9_SIDISR, |
| 417 | TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS | |
| 418 | TXX9_SIDISR_TOUT); |
| 419 | spin_unlock(&up->port.lock); |
| 420 | |
| 421 | if (pass_counter++ > PASS_LIMIT) |
| 422 | break; |
| 423 | } |
| 424 | |
| 425 | return pass_counter ? IRQ_HANDLED : IRQ_NONE; |
| 426 | } |
| 427 | |
| 428 | static unsigned int serial_txx9_tx_empty(struct uart_port *port) |
| 429 | { |
| 430 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 431 | unsigned long flags; |
| 432 | unsigned int ret; |
| 433 | |
| 434 | spin_lock_irqsave(&up->port.lock, flags); |
| 435 | ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0; |
| 436 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 437 | |
| 438 | return ret; |
| 439 | } |
| 440 | |
| 441 | static unsigned int serial_txx9_get_mctrl(struct uart_port *port) |
| 442 | { |
| 443 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | unsigned int ret; |
| 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | ret = ((sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS) |
| 447 | | ((sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
| 449 | return ret; |
| 450 | } |
| 451 | |
| 452 | static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 453 | { |
| 454 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (mctrl & TIOCM_RTS) |
| 457 | sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC); |
| 458 | else |
| 459 | sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | static void serial_txx9_break_ctl(struct uart_port *port, int break_state) |
| 463 | { |
| 464 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 465 | unsigned long flags; |
| 466 | |
| 467 | spin_lock_irqsave(&up->port.lock, flags); |
| 468 | if (break_state == -1) |
| 469 | sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK); |
| 470 | else |
| 471 | sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK); |
| 472 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 473 | } |
| 474 | |
| 475 | static int serial_txx9_startup(struct uart_port *port) |
| 476 | { |
| 477 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 478 | unsigned long flags; |
| 479 | int retval; |
| 480 | |
| 481 | /* |
| 482 | * Clear the FIFO buffers and disable them. |
Alexey Dobriyan | 7f927fc | 2006-03-28 01:56:53 -0800 | [diff] [blame] | 483 | * (they will be reenabled in set_termios()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | */ |
| 485 | sio_set(up, TXX9_SIFCR, |
| 486 | TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); |
| 487 | /* clear reset */ |
| 488 | sio_mask(up, TXX9_SIFCR, |
| 489 | TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); |
| 490 | sio_out(up, TXX9_SIDICR, 0); |
| 491 | |
| 492 | /* |
| 493 | * Clear the interrupt registers. |
| 494 | */ |
| 495 | sio_out(up, TXX9_SIDISR, 0); |
| 496 | |
| 497 | retval = request_irq(up->port.irq, serial_txx9_interrupt, |
| 498 | SA_SHIRQ, "serial_txx9", up); |
| 499 | if (retval) |
| 500 | return retval; |
| 501 | |
| 502 | /* |
| 503 | * Now, initialize the UART |
| 504 | */ |
| 505 | spin_lock_irqsave(&up->port.lock, flags); |
| 506 | serial_txx9_set_mctrl(&up->port, up->port.mctrl); |
| 507 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 508 | |
| 509 | /* Enable RX/TX */ |
| 510 | sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE); |
| 511 | |
| 512 | /* |
| 513 | * Finally, enable interrupts. |
| 514 | */ |
| 515 | sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE); |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | static void serial_txx9_shutdown(struct uart_port *port) |
| 521 | { |
| 522 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 523 | unsigned long flags; |
| 524 | |
| 525 | /* |
| 526 | * Disable interrupts from this port |
| 527 | */ |
| 528 | sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */ |
| 529 | |
| 530 | spin_lock_irqsave(&up->port.lock, flags); |
| 531 | serial_txx9_set_mctrl(&up->port, up->port.mctrl); |
| 532 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 533 | |
| 534 | /* |
| 535 | * Disable break condition |
| 536 | */ |
| 537 | sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK); |
| 538 | |
| 539 | #ifdef CONFIG_SERIAL_TXX9_CONSOLE |
| 540 | if (up->port.cons && up->port.line == up->port.cons->index) { |
| 541 | free_irq(up->port.irq, up); |
| 542 | return; |
| 543 | } |
| 544 | #endif |
| 545 | /* reset FIFOs */ |
| 546 | sio_set(up, TXX9_SIFCR, |
| 547 | TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); |
| 548 | /* clear reset */ |
| 549 | sio_mask(up, TXX9_SIFCR, |
| 550 | TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); |
| 551 | |
| 552 | /* Disable RX/TX */ |
| 553 | sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE); |
| 554 | |
| 555 | free_irq(up->port.irq, up); |
| 556 | } |
| 557 | |
| 558 | static void |
| 559 | serial_txx9_set_termios(struct uart_port *port, struct termios *termios, |
| 560 | struct termios *old) |
| 561 | { |
| 562 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 563 | unsigned int cval, fcr = 0; |
| 564 | unsigned long flags; |
| 565 | unsigned int baud, quot; |
| 566 | |
| 567 | cval = sio_in(up, TXX9_SILCR); |
| 568 | /* byte size and parity */ |
| 569 | cval &= ~TXX9_SILCR_UMODE_MASK; |
| 570 | switch (termios->c_cflag & CSIZE) { |
| 571 | case CS7: |
| 572 | cval |= TXX9_SILCR_UMODE_7BIT; |
| 573 | break; |
| 574 | default: |
| 575 | case CS5: /* not supported */ |
| 576 | case CS6: /* not supported */ |
| 577 | case CS8: |
| 578 | cval |= TXX9_SILCR_UMODE_8BIT; |
| 579 | break; |
| 580 | } |
| 581 | |
| 582 | cval &= ~TXX9_SILCR_USBL_MASK; |
| 583 | if (termios->c_cflag & CSTOPB) |
| 584 | cval |= TXX9_SILCR_USBL_2BIT; |
| 585 | else |
| 586 | cval |= TXX9_SILCR_USBL_1BIT; |
| 587 | cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS); |
| 588 | if (termios->c_cflag & PARENB) |
| 589 | cval |= TXX9_SILCR_UPEN; |
| 590 | if (!(termios->c_cflag & PARODD)) |
| 591 | cval |= TXX9_SILCR_UEPS; |
| 592 | |
| 593 | /* |
| 594 | * Ask the core to calculate the divisor for us. |
| 595 | */ |
| 596 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2); |
| 597 | quot = uart_get_divisor(port, baud); |
| 598 | |
| 599 | /* Set up FIFOs */ |
| 600 | /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */ |
| 601 | fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1; |
| 602 | |
| 603 | /* |
| 604 | * Ok, we're now changing the port state. Do it with |
| 605 | * interrupts disabled. |
| 606 | */ |
| 607 | spin_lock_irqsave(&up->port.lock, flags); |
| 608 | |
| 609 | /* |
| 610 | * Update the per-port timeout. |
| 611 | */ |
| 612 | uart_update_timeout(port, termios->c_cflag, baud); |
| 613 | |
| 614 | up->port.read_status_mask = TXX9_SIDISR_UOER | |
| 615 | TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS; |
| 616 | if (termios->c_iflag & INPCK) |
| 617 | up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER; |
| 618 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 619 | up->port.read_status_mask |= TXX9_SIDISR_UBRK; |
| 620 | |
| 621 | /* |
| 622 | * Characteres to ignore |
| 623 | */ |
| 624 | up->port.ignore_status_mask = 0; |
| 625 | if (termios->c_iflag & IGNPAR) |
| 626 | up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER; |
| 627 | if (termios->c_iflag & IGNBRK) { |
| 628 | up->port.ignore_status_mask |= TXX9_SIDISR_UBRK; |
| 629 | /* |
| 630 | * If we're ignoring parity and break indicators, |
| 631 | * ignore overruns too (for real raw support). |
| 632 | */ |
| 633 | if (termios->c_iflag & IGNPAR) |
| 634 | up->port.ignore_status_mask |= TXX9_SIDISR_UOER; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * ignore all characters if CREAD is not set |
| 639 | */ |
| 640 | if ((termios->c_cflag & CREAD) == 0) |
| 641 | up->port.ignore_status_mask |= TXX9_SIDISR_RDIS; |
| 642 | |
| 643 | /* CTS flow control flag */ |
| 644 | if ((termios->c_cflag & CRTSCTS) && |
| 645 | (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) { |
| 646 | sio_set(up, TXX9_SIFLCR, |
| 647 | TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES); |
| 648 | } else { |
| 649 | sio_mask(up, TXX9_SIFLCR, |
| 650 | TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES); |
| 651 | } |
| 652 | |
| 653 | sio_out(up, TXX9_SILCR, cval); |
| 654 | sio_quot_set(up, quot); |
| 655 | sio_out(up, TXX9_SIFCR, fcr); |
| 656 | |
| 657 | serial_txx9_set_mctrl(&up->port, up->port.mctrl); |
| 658 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 659 | } |
| 660 | |
| 661 | static void |
| 662 | serial_txx9_pm(struct uart_port *port, unsigned int state, |
| 663 | unsigned int oldstate) |
| 664 | { |
| 665 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 666 | if (up->pm) |
| 667 | up->pm(port, state, oldstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | static int serial_txx9_request_resource(struct uart_txx9_port *up) |
| 671 | { |
| 672 | unsigned int size = TXX9_REGION_SIZE; |
| 673 | int ret = 0; |
| 674 | |
| 675 | switch (up->port.iotype) { |
| 676 | default: |
| 677 | if (!up->port.mapbase) |
| 678 | break; |
| 679 | |
| 680 | if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) { |
| 681 | ret = -EBUSY; |
| 682 | break; |
| 683 | } |
| 684 | |
| 685 | if (up->port.flags & UPF_IOREMAP) { |
| 686 | up->port.membase = ioremap(up->port.mapbase, size); |
| 687 | if (!up->port.membase) { |
| 688 | release_mem_region(up->port.mapbase, size); |
| 689 | ret = -ENOMEM; |
| 690 | } |
| 691 | } |
| 692 | break; |
| 693 | |
| 694 | case UPIO_PORT: |
| 695 | if (!request_region(up->port.iobase, size, "serial_txx9")) |
| 696 | ret = -EBUSY; |
| 697 | break; |
| 698 | } |
| 699 | return ret; |
| 700 | } |
| 701 | |
| 702 | static void serial_txx9_release_resource(struct uart_txx9_port *up) |
| 703 | { |
| 704 | unsigned int size = TXX9_REGION_SIZE; |
| 705 | |
| 706 | switch (up->port.iotype) { |
| 707 | default: |
| 708 | if (!up->port.mapbase) |
| 709 | break; |
| 710 | |
| 711 | if (up->port.flags & UPF_IOREMAP) { |
| 712 | iounmap(up->port.membase); |
| 713 | up->port.membase = NULL; |
| 714 | } |
| 715 | |
| 716 | release_mem_region(up->port.mapbase, size); |
| 717 | break; |
| 718 | |
| 719 | case UPIO_PORT: |
| 720 | release_region(up->port.iobase, size); |
| 721 | break; |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | static void serial_txx9_release_port(struct uart_port *port) |
| 726 | { |
| 727 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 728 | serial_txx9_release_resource(up); |
| 729 | } |
| 730 | |
| 731 | static int serial_txx9_request_port(struct uart_port *port) |
| 732 | { |
| 733 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 734 | return serial_txx9_request_resource(up); |
| 735 | } |
| 736 | |
| 737 | static void serial_txx9_config_port(struct uart_port *port, int uflags) |
| 738 | { |
| 739 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 740 | unsigned long flags; |
| 741 | int ret; |
| 742 | |
| 743 | /* |
| 744 | * Find the region that we can probe for. This in turn |
| 745 | * tells us whether we can probe for the type of port. |
| 746 | */ |
| 747 | ret = serial_txx9_request_resource(up); |
| 748 | if (ret < 0) |
| 749 | return; |
| 750 | port->type = PORT_TXX9; |
| 751 | up->port.fifosize = TXX9_SIO_TX_FIFO; |
| 752 | |
| 753 | #ifdef CONFIG_SERIAL_TXX9_CONSOLE |
| 754 | if (up->port.line == up->port.cons->index) |
| 755 | return; |
| 756 | #endif |
| 757 | spin_lock_irqsave(&up->port.lock, flags); |
| 758 | /* |
| 759 | * Reset the UART. |
| 760 | */ |
| 761 | sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST); |
| 762 | #ifdef CONFIG_CPU_TX49XX |
| 763 | /* TX4925 BUG WORKAROUND. Accessing SIOC register |
| 764 | * immediately after soft reset causes bus error. */ |
| 765 | iob(); |
| 766 | udelay(1); |
| 767 | #endif |
| 768 | while (sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) |
| 769 | ; |
| 770 | /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */ |
| 771 | sio_set(up, TXX9_SIFCR, |
| 772 | TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1); |
| 773 | /* initial settings */ |
| 774 | sio_out(up, TXX9_SILCR, |
| 775 | TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT | |
| 776 | ((up->port.flags & UPF_TXX9_USE_SCLK) ? |
| 777 | TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG)); |
| 778 | sio_quot_set(up, uart_get_divisor(port, 9600)); |
| 779 | sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */); |
| 780 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 781 | } |
| 782 | |
| 783 | static int |
| 784 | serial_txx9_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 785 | { |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 786 | unsigned long new_port = ser->port; |
| 787 | if (HIGH_BITS_OFFSET) |
| 788 | new_port += (unsigned long)ser->port_high << HIGH_BITS_OFFSET; |
| 789 | if (ser->type != port->type || |
| 790 | ser->irq != port->irq || |
| 791 | ser->io_type != port->iotype || |
| 792 | new_port != port->iobase || |
| 793 | (unsigned long)ser->iomem_base != port->mapbase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | return -EINVAL; |
| 795 | return 0; |
| 796 | } |
| 797 | |
| 798 | static const char * |
| 799 | serial_txx9_type(struct uart_port *port) |
| 800 | { |
| 801 | return "txx9"; |
| 802 | } |
| 803 | |
| 804 | static struct uart_ops serial_txx9_pops = { |
| 805 | .tx_empty = serial_txx9_tx_empty, |
| 806 | .set_mctrl = serial_txx9_set_mctrl, |
| 807 | .get_mctrl = serial_txx9_get_mctrl, |
| 808 | .stop_tx = serial_txx9_stop_tx, |
| 809 | .start_tx = serial_txx9_start_tx, |
| 810 | .stop_rx = serial_txx9_stop_rx, |
| 811 | .enable_ms = serial_txx9_enable_ms, |
| 812 | .break_ctl = serial_txx9_break_ctl, |
| 813 | .startup = serial_txx9_startup, |
| 814 | .shutdown = serial_txx9_shutdown, |
| 815 | .set_termios = serial_txx9_set_termios, |
| 816 | .pm = serial_txx9_pm, |
| 817 | .type = serial_txx9_type, |
| 818 | .release_port = serial_txx9_release_port, |
| 819 | .request_port = serial_txx9_request_port, |
| 820 | .config_port = serial_txx9_config_port, |
| 821 | .verify_port = serial_txx9_verify_port, |
| 822 | }; |
| 823 | |
| 824 | static struct uart_txx9_port serial_txx9_ports[UART_NR]; |
| 825 | |
| 826 | static void __init serial_txx9_register_ports(struct uart_driver *drv) |
| 827 | { |
| 828 | int i; |
| 829 | |
| 830 | for (i = 0; i < UART_NR; i++) { |
| 831 | struct uart_txx9_port *up = &serial_txx9_ports[i]; |
| 832 | |
| 833 | up->port.line = i; |
| 834 | up->port.ops = &serial_txx9_pops; |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 835 | if (up->port.iobase || up->port.mapbase) |
| 836 | uart_add_one_port(drv, &up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | } |
| 839 | |
| 840 | #ifdef CONFIG_SERIAL_TXX9_CONSOLE |
| 841 | |
| 842 | /* |
| 843 | * Wait for transmitter & holding register to empty |
| 844 | */ |
| 845 | static inline void wait_for_xmitr(struct uart_txx9_port *up) |
| 846 | { |
| 847 | unsigned int tmout = 10000; |
| 848 | |
| 849 | /* Wait up to 10ms for the character(s) to be sent. */ |
| 850 | while (--tmout && |
| 851 | !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS)) |
| 852 | udelay(1); |
| 853 | |
| 854 | /* Wait up to 1s for flow control if necessary */ |
| 855 | if (up->port.flags & UPF_CONS_FLOW) { |
| 856 | tmout = 1000000; |
| 857 | while (--tmout && |
| 858 | (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS)) |
| 859 | udelay(1); |
| 860 | } |
| 861 | } |
| 862 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 863 | static void serial_txx9_console_putchar(struct uart_port *port, int ch) |
| 864 | { |
| 865 | struct uart_txx9_port *up = (struct uart_txx9_port *)port; |
| 866 | |
| 867 | wait_for_xmitr(up); |
| 868 | sio_out(up, TXX9_SITFIFO, ch); |
| 869 | } |
| 870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | /* |
| 872 | * Print a string to the serial port trying not to disturb |
| 873 | * any possible real use of the port... |
| 874 | * |
| 875 | * The console_lock must be held when we get here. |
| 876 | */ |
| 877 | static void |
| 878 | serial_txx9_console_write(struct console *co, const char *s, unsigned int count) |
| 879 | { |
| 880 | struct uart_txx9_port *up = &serial_txx9_ports[co->index]; |
| 881 | unsigned int ier, flcr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
| 883 | /* |
| 884 | * First save the UER then disable the interrupts |
| 885 | */ |
| 886 | ier = sio_in(up, TXX9_SIDICR); |
| 887 | sio_out(up, TXX9_SIDICR, 0); |
| 888 | /* |
| 889 | * Disable flow-control if enabled (and unnecessary) |
| 890 | */ |
| 891 | flcr = sio_in(up, TXX9_SIFLCR); |
| 892 | if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES)) |
| 893 | sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES); |
| 894 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 895 | uart_console_write(&up->port, s, count, serial_txx9_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
| 897 | /* |
| 898 | * Finally, wait for transmitter to become empty |
| 899 | * and restore the IER |
| 900 | */ |
| 901 | wait_for_xmitr(up); |
| 902 | sio_out(up, TXX9_SIFLCR, flcr); |
| 903 | sio_out(up, TXX9_SIDICR, ier); |
| 904 | } |
| 905 | |
| 906 | static int serial_txx9_console_setup(struct console *co, char *options) |
| 907 | { |
| 908 | struct uart_port *port; |
| 909 | struct uart_txx9_port *up; |
| 910 | int baud = 9600; |
| 911 | int bits = 8; |
| 912 | int parity = 'n'; |
| 913 | int flow = 'n'; |
| 914 | |
| 915 | /* |
| 916 | * Check whether an invalid uart number has been specified, and |
| 917 | * if so, search for the first available port that does have |
| 918 | * console support. |
| 919 | */ |
| 920 | if (co->index >= UART_NR) |
| 921 | co->index = 0; |
| 922 | up = &serial_txx9_ports[co->index]; |
| 923 | port = &up->port; |
| 924 | if (!port->ops) |
| 925 | return -ENODEV; |
| 926 | |
| 927 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | * Disable UART interrupts, set DTR and RTS high |
| 929 | * and set speed. |
| 930 | */ |
| 931 | sio_out(up, TXX9_SIDICR, 0); |
| 932 | /* initial settings */ |
| 933 | sio_out(up, TXX9_SILCR, |
| 934 | TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT | |
| 935 | ((port->flags & UPF_TXX9_USE_SCLK) ? |
| 936 | TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG)); |
| 937 | sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */); |
| 938 | |
| 939 | if (options) |
| 940 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 941 | |
| 942 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 943 | } |
| 944 | |
| 945 | static struct uart_driver serial_txx9_reg; |
| 946 | static struct console serial_txx9_console = { |
| 947 | .name = TXX9_TTY_NAME, |
| 948 | .write = serial_txx9_console_write, |
| 949 | .device = uart_console_device, |
| 950 | .setup = serial_txx9_console_setup, |
| 951 | .flags = CON_PRINTBUFFER, |
| 952 | .index = -1, |
| 953 | .data = &serial_txx9_reg, |
| 954 | }; |
| 955 | |
| 956 | static int __init serial_txx9_console_init(void) |
| 957 | { |
| 958 | register_console(&serial_txx9_console); |
| 959 | return 0; |
| 960 | } |
| 961 | console_initcall(serial_txx9_console_init); |
| 962 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | #define SERIAL_TXX9_CONSOLE &serial_txx9_console |
| 964 | #else |
| 965 | #define SERIAL_TXX9_CONSOLE NULL |
| 966 | #endif |
| 967 | |
| 968 | static struct uart_driver serial_txx9_reg = { |
| 969 | .owner = THIS_MODULE, |
| 970 | .driver_name = "serial_txx9", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | .dev_name = TXX9_TTY_NAME, |
| 972 | .major = TXX9_TTY_MAJOR, |
| 973 | .minor = TXX9_TTY_MINOR_START, |
| 974 | .nr = UART_NR, |
| 975 | .cons = SERIAL_TXX9_CONSOLE, |
| 976 | }; |
| 977 | |
| 978 | int __init early_serial_txx9_setup(struct uart_port *port) |
| 979 | { |
| 980 | if (port->line >= ARRAY_SIZE(serial_txx9_ports)) |
| 981 | return -ENODEV; |
| 982 | |
| 983 | serial_txx9_ports[port->line].port = *port; |
| 984 | serial_txx9_ports[port->line].port.ops = &serial_txx9_pops; |
| 985 | serial_txx9_ports[port->line].port.flags |= UPF_BOOT_AUTOCONF; |
| 986 | return 0; |
| 987 | } |
| 988 | |
| 989 | #ifdef ENABLE_SERIAL_TXX9_PCI |
| 990 | /** |
| 991 | * serial_txx9_suspend_port - suspend one serial port |
| 992 | * @line: serial line number |
| 993 | * @level: the level of port suspension, as per uart_suspend_port |
| 994 | * |
| 995 | * Suspend one serial port. |
| 996 | */ |
| 997 | static void serial_txx9_suspend_port(int line) |
| 998 | { |
| 999 | uart_suspend_port(&serial_txx9_reg, &serial_txx9_ports[line].port); |
| 1000 | } |
| 1001 | |
| 1002 | /** |
| 1003 | * serial_txx9_resume_port - resume one serial port |
| 1004 | * @line: serial line number |
| 1005 | * @level: the level of port resumption, as per uart_resume_port |
| 1006 | * |
| 1007 | * Resume one serial port. |
| 1008 | */ |
| 1009 | static void serial_txx9_resume_port(int line) |
| 1010 | { |
| 1011 | uart_resume_port(&serial_txx9_reg, &serial_txx9_ports[line].port); |
| 1012 | } |
| 1013 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 1014 | static DEFINE_MUTEX(serial_txx9_mutex); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1015 | |
| 1016 | /** |
| 1017 | * serial_txx9_register_port - register a serial port |
| 1018 | * @port: serial port template |
| 1019 | * |
| 1020 | * Configure the serial port specified by the request. |
| 1021 | * |
| 1022 | * The port is then probed and if necessary the IRQ is autodetected |
| 1023 | * If this fails an error is returned. |
| 1024 | * |
| 1025 | * On success the port is ready to use and the line number is returned. |
| 1026 | */ |
| 1027 | static int __devinit serial_txx9_register_port(struct uart_port *port) |
| 1028 | { |
| 1029 | int i; |
| 1030 | struct uart_txx9_port *uart; |
| 1031 | int ret = -ENOSPC; |
| 1032 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 1033 | mutex_lock(&serial_txx9_mutex); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1034 | for (i = 0; i < UART_NR; i++) { |
| 1035 | uart = &serial_txx9_ports[i]; |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 1036 | if (!(uart->port.iobase || uart->port.mapbase)) |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1037 | break; |
| 1038 | } |
| 1039 | if (i < UART_NR) { |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1040 | uart->port.iobase = port->iobase; |
| 1041 | uart->port.membase = port->membase; |
| 1042 | uart->port.irq = port->irq; |
| 1043 | uart->port.uartclk = port->uartclk; |
| 1044 | uart->port.iotype = port->iotype; |
| 1045 | uart->port.flags = port->flags | UPF_BOOT_AUTOCONF; |
| 1046 | uart->port.mapbase = port->mapbase; |
| 1047 | if (port->dev) |
| 1048 | uart->port.dev = port->dev; |
| 1049 | ret = uart_add_one_port(&serial_txx9_reg, &uart->port); |
| 1050 | if (ret == 0) |
| 1051 | ret = uart->port.line; |
| 1052 | } |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 1053 | mutex_unlock(&serial_txx9_mutex); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1054 | return ret; |
| 1055 | } |
| 1056 | |
| 1057 | /** |
| 1058 | * serial_txx9_unregister_port - remove a txx9 serial port at runtime |
| 1059 | * @line: serial line number |
| 1060 | * |
| 1061 | * Remove one serial port. This may not be called from interrupt |
| 1062 | * context. We hand the port back to the our control. |
| 1063 | */ |
| 1064 | static void __devexit serial_txx9_unregister_port(int line) |
| 1065 | { |
| 1066 | struct uart_txx9_port *uart = &serial_txx9_ports[line]; |
| 1067 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 1068 | mutex_lock(&serial_txx9_mutex); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1069 | uart_remove_one_port(&serial_txx9_reg, &uart->port); |
| 1070 | uart->port.flags = 0; |
| 1071 | uart->port.type = PORT_UNKNOWN; |
| 1072 | uart->port.iobase = 0; |
| 1073 | uart->port.mapbase = 0; |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 1074 | uart->port.membase = NULL; |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1075 | uart->port.dev = NULL; |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 1076 | mutex_unlock(&serial_txx9_mutex); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1077 | } |
| 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | /* |
| 1080 | * Probe one serial board. Unfortunately, there is no rhyme nor reason |
| 1081 | * to the arrangement of serial ports on a PCI card. |
| 1082 | */ |
| 1083 | static int __devinit |
| 1084 | pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent) |
| 1085 | { |
| 1086 | struct uart_port port; |
| 1087 | int line; |
| 1088 | int rc; |
| 1089 | |
| 1090 | rc = pci_enable_device(dev); |
| 1091 | if (rc) |
| 1092 | return rc; |
| 1093 | |
| 1094 | memset(&port, 0, sizeof(port)); |
| 1095 | port.ops = &serial_txx9_pops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | port.flags |= UPF_TXX9_HAVE_CTS_LINE; |
| 1097 | port.uartclk = 66670000; |
| 1098 | port.irq = dev->irq; |
| 1099 | port.iotype = UPIO_PORT; |
| 1100 | port.iobase = pci_resource_start(dev, 1); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1101 | port.dev = &dev->dev; |
| 1102 | line = serial_txx9_register_port(&port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | if (line < 0) { |
| 1104 | printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line); |
| 1105 | } |
| 1106 | pci_set_drvdata(dev, (void *)(long)line); |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev) |
| 1112 | { |
| 1113 | int line = (int)(long)pci_get_drvdata(dev); |
| 1114 | |
| 1115 | pci_set_drvdata(dev, NULL); |
| 1116 | |
| 1117 | if (line) { |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1118 | serial_txx9_unregister_port(line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | pci_disable_device(dev); |
| 1120 | } |
| 1121 | } |
| 1122 | |
Pavel Machek | 0370aff | 2005-04-16 15:25:35 -0700 | [diff] [blame] | 1123 | static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | { |
| 1125 | int line = (int)(long)pci_get_drvdata(dev); |
| 1126 | |
| 1127 | if (line) |
| 1128 | serial_txx9_suspend_port(line); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1129 | pci_save_state(dev); |
| 1130 | pci_set_power_state(dev, pci_choose_state(dev, state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | return 0; |
| 1132 | } |
| 1133 | |
| 1134 | static int pciserial_txx9_resume_one(struct pci_dev *dev) |
| 1135 | { |
| 1136 | int line = (int)(long)pci_get_drvdata(dev); |
| 1137 | |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1138 | pci_set_power_state(dev, PCI_D0); |
| 1139 | pci_restore_state(dev); |
| 1140 | |
| 1141 | if (line) { |
| 1142 | pci_enable_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | serial_txx9_resume_port(line); |
Ralf Baechle | f5ee56c | 2005-09-09 13:01:32 -0700 | [diff] [blame] | 1144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | static struct pci_device_id serial_txx9_pci_tbl[] = { |
| 1149 | { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC, |
| 1150 | PCI_ANY_ID, PCI_ANY_ID, |
| 1151 | 0, 0, 0 }, |
| 1152 | { 0, } |
| 1153 | }; |
| 1154 | |
| 1155 | static struct pci_driver serial_txx9_pci_driver = { |
| 1156 | .name = "serial_txx9", |
| 1157 | .probe = pciserial_txx9_init_one, |
| 1158 | .remove = __devexit_p(pciserial_txx9_remove_one), |
| 1159 | .suspend = pciserial_txx9_suspend_one, |
| 1160 | .resume = pciserial_txx9_resume_one, |
| 1161 | .id_table = serial_txx9_pci_tbl, |
| 1162 | }; |
| 1163 | |
| 1164 | MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl); |
| 1165 | #endif /* ENABLE_SERIAL_TXX9_PCI */ |
| 1166 | |
| 1167 | static int __init serial_txx9_init(void) |
| 1168 | { |
| 1169 | int ret; |
| 1170 | |
| 1171 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); |
| 1172 | |
| 1173 | ret = uart_register_driver(&serial_txx9_reg); |
| 1174 | if (ret >= 0) { |
| 1175 | serial_txx9_register_ports(&serial_txx9_reg); |
| 1176 | |
| 1177 | #ifdef ENABLE_SERIAL_TXX9_PCI |
Richard Knutsson | 93b4768 | 2005-11-30 01:00:35 +0100 | [diff] [blame] | 1178 | ret = pci_register_driver(&serial_txx9_pci_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | #endif |
| 1180 | } |
| 1181 | return ret; |
| 1182 | } |
| 1183 | |
| 1184 | static void __exit serial_txx9_exit(void) |
| 1185 | { |
| 1186 | int i; |
| 1187 | |
| 1188 | #ifdef ENABLE_SERIAL_TXX9_PCI |
| 1189 | pci_unregister_driver(&serial_txx9_pci_driver); |
| 1190 | #endif |
Atsushi Nemoto | 83485f8 | 2006-03-22 00:07:45 -0800 | [diff] [blame] | 1191 | for (i = 0; i < UART_NR; i++) { |
| 1192 | struct uart_txx9_port *up = &serial_txx9_ports[i]; |
| 1193 | if (up->port.iobase || up->port.mapbase) |
| 1194 | uart_remove_one_port(&serial_txx9_reg, &up->port); |
| 1195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
| 1197 | uart_unregister_driver(&serial_txx9_reg); |
| 1198 | } |
| 1199 | |
| 1200 | module_init(serial_txx9_init); |
| 1201 | module_exit(serial_txx9_exit); |
| 1202 | |
| 1203 | MODULE_LICENSE("GPL"); |
| 1204 | MODULE_DESCRIPTION("TX39/49 serial driver"); |
| 1205 | |
| 1206 | MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR); |