Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * esp.c - driver for Hayes ESP serial cards |
| 3 | * |
| 4 | * --- Notices from serial.c, upon which this driver is based --- |
| 5 | * |
| 6 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 7 | * |
| 8 | * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now |
| 9 | * much more extensible to support other serial cards based on the |
| 10 | * 16450/16550A UART's. Added support for the AST FourPort and the |
| 11 | * Accent Async board. |
| 12 | * |
| 13 | * set_serial_info fixed to set the flags, custom divisor, and uart |
| 14 | * type fields. Fix suggested by Michael K. Johnson 12/12/92. |
| 15 | * |
| 16 | * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk> |
| 17 | * |
| 18 | * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk> |
| 19 | * |
| 20 | * rs_set_termios fixed to look also for changes of the input |
| 21 | * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK. |
| 22 | * Bernd Anh�pl 05/17/96. |
| 23 | * |
| 24 | * --- End of notices from serial.c --- |
| 25 | * |
| 26 | * Support for the ESP serial card by Andrew J. Robinson |
| 27 | * <arobinso@nyx.net> (Card detection routine taken from a patch |
| 28 | * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed |
| 29 | * by Chris Faylor. |
| 30 | * |
| 31 | * Most recent changes: (Andrew J. Robinson) |
| 32 | * Support for PIO mode. This allows the driver to work properly with |
| 33 | * multiport cards. |
| 34 | * |
| 35 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - |
| 36 | * several cleanups, use module_init/module_exit, etc |
| 37 | * |
| 38 | * This module exports the following rs232 io functions: |
| 39 | * |
| 40 | * int espserial_init(void); |
| 41 | */ |
| 42 | |
| 43 | #include <linux/module.h> |
| 44 | #include <linux/errno.h> |
| 45 | #include <linux/signal.h> |
| 46 | #include <linux/sched.h> |
| 47 | #include <linux/interrupt.h> |
| 48 | #include <linux/tty.h> |
| 49 | #include <linux/tty_flip.h> |
| 50 | #include <linux/serial.h> |
| 51 | #include <linux/serialP.h> |
| 52 | #include <linux/serial_reg.h> |
| 53 | #include <linux/major.h> |
| 54 | #include <linux/string.h> |
| 55 | #include <linux/fcntl.h> |
| 56 | #include <linux/ptrace.h> |
| 57 | #include <linux/ioport.h> |
| 58 | #include <linux/mm.h> |
| 59 | #include <linux/init.h> |
| 60 | #include <linux/delay.h> |
| 61 | |
| 62 | #include <asm/system.h> |
| 63 | #include <asm/io.h> |
| 64 | #include <asm/bitops.h> |
| 65 | |
| 66 | #include <asm/dma.h> |
| 67 | #include <linux/slab.h> |
| 68 | #include <asm/uaccess.h> |
| 69 | |
| 70 | #include <linux/hayesesp.h> |
| 71 | |
| 72 | #define NR_PORTS 64 /* maximum number of ports */ |
| 73 | #define NR_PRIMARY 8 /* maximum number of primary ports */ |
| 74 | #define REGION_SIZE 8 /* size of io region to request */ |
| 75 | |
| 76 | /* The following variables can be set by giving module options */ |
| 77 | static int irq[NR_PRIMARY]; /* IRQ for each base port */ |
| 78 | static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */ |
| 79 | static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */ |
| 80 | static unsigned int rx_trigger = ESP_RX_TRIGGER; |
| 81 | static unsigned int tx_trigger = ESP_TX_TRIGGER; |
| 82 | static unsigned int flow_off = ESP_FLOW_OFF; |
| 83 | static unsigned int flow_on = ESP_FLOW_ON; |
| 84 | static unsigned int rx_timeout = ESP_RX_TMOUT; |
| 85 | static unsigned int pio_threshold = ESP_PIO_THRESHOLD; |
| 86 | |
| 87 | MODULE_LICENSE("GPL"); |
| 88 | |
| 89 | module_param_array(irq, int, NULL, 0); |
| 90 | module_param_array(divisor, uint, NULL, 0); |
| 91 | module_param(dma, uint, 0); |
| 92 | module_param(rx_trigger, uint, 0); |
| 93 | module_param(tx_trigger, uint, 0); |
| 94 | module_param(flow_off, uint, 0); |
| 95 | module_param(flow_on, uint, 0); |
| 96 | module_param(rx_timeout, uint, 0); |
| 97 | module_param(pio_threshold, uint, 0); |
| 98 | |
| 99 | /* END */ |
| 100 | |
| 101 | static char *dma_buffer; |
| 102 | static int dma_bytes; |
| 103 | static struct esp_pio_buffer *free_pio_buf; |
| 104 | |
| 105 | #define DMA_BUFFER_SZ 1024 |
| 106 | |
| 107 | #define WAKEUP_CHARS 1024 |
| 108 | |
| 109 | static char serial_name[] __initdata = "ESP serial driver"; |
| 110 | static char serial_version[] __initdata = "2.2"; |
| 111 | |
| 112 | static struct tty_driver *esp_driver; |
| 113 | |
| 114 | /* serial subtype definitions */ |
| 115 | #define SERIAL_TYPE_NORMAL 1 |
| 116 | |
| 117 | /* |
| 118 | * Serial driver configuration section. Here are the various options: |
| 119 | * |
| 120 | * SERIAL_PARANOIA_CHECK |
| 121 | * Check the magic number for the esp_structure where |
| 122 | * ever possible. |
| 123 | */ |
| 124 | |
| 125 | #undef SERIAL_PARANOIA_CHECK |
| 126 | #define SERIAL_DO_RESTART |
| 127 | |
| 128 | #undef SERIAL_DEBUG_INTR |
| 129 | #undef SERIAL_DEBUG_OPEN |
| 130 | #undef SERIAL_DEBUG_FLOW |
| 131 | |
| 132 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) |
| 133 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ |
| 134 | tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s) |
| 135 | #else |
| 136 | #define DBG_CNT(s) |
| 137 | #endif |
| 138 | |
| 139 | static struct esp_struct *ports; |
| 140 | |
| 141 | static void change_speed(struct esp_struct *info); |
| 142 | static void rs_wait_until_sent(struct tty_struct *, int); |
| 143 | |
| 144 | /* |
| 145 | * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE |
| 146 | * times the normal 1.8432 Mhz clock of most serial boards). |
| 147 | */ |
| 148 | #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE)) |
| 149 | |
| 150 | /* Standard COM flags (except for COM4, because of the 8514 problem) */ |
| 151 | #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | static inline int serial_paranoia_check(struct esp_struct *info, |
| 154 | char *name, const char *routine) |
| 155 | { |
| 156 | #ifdef SERIAL_PARANOIA_CHECK |
| 157 | static const char badmagic[] = KERN_WARNING |
| 158 | "Warning: bad magic number for serial struct (%s) in %s\n"; |
| 159 | static const char badinfo[] = KERN_WARNING |
| 160 | "Warning: null esp_struct for (%s) in %s\n"; |
| 161 | |
| 162 | if (!info) { |
| 163 | printk(badinfo, name, routine); |
| 164 | return 1; |
| 165 | } |
| 166 | if (info->magic != ESP_MAGIC) { |
| 167 | printk(badmagic, name, routine); |
| 168 | return 1; |
| 169 | } |
| 170 | #endif |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static inline unsigned int serial_in(struct esp_struct *info, int offset) |
| 175 | { |
| 176 | return inb(info->port + offset); |
| 177 | } |
| 178 | |
| 179 | static inline void serial_out(struct esp_struct *info, int offset, |
| 180 | unsigned char value) |
| 181 | { |
| 182 | outb(value, info->port+offset); |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * ------------------------------------------------------------ |
| 187 | * rs_stop() and rs_start() |
| 188 | * |
| 189 | * This routines are called before setting or resetting tty->stopped. |
| 190 | * They enable or disable transmitter interrupts, as necessary. |
| 191 | * ------------------------------------------------------------ |
| 192 | */ |
| 193 | static void rs_stop(struct tty_struct *tty) |
| 194 | { |
| 195 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 196 | unsigned long flags; |
| 197 | |
| 198 | if (serial_paranoia_check(info, tty->name, "rs_stop")) |
| 199 | return; |
| 200 | |
| 201 | spin_lock_irqsave(&info->lock, flags); |
| 202 | if (info->IER & UART_IER_THRI) { |
| 203 | info->IER &= ~UART_IER_THRI; |
| 204 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 205 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 206 | } |
| 207 | spin_unlock_irqrestore(&info->lock, flags); |
| 208 | } |
| 209 | |
| 210 | static void rs_start(struct tty_struct *tty) |
| 211 | { |
| 212 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 213 | unsigned long flags; |
| 214 | |
| 215 | if (serial_paranoia_check(info, tty->name, "rs_start")) |
| 216 | return; |
| 217 | |
| 218 | spin_lock_irqsave(&info->lock, flags); |
| 219 | if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) { |
| 220 | info->IER |= UART_IER_THRI; |
| 221 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 222 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 223 | } |
| 224 | spin_unlock_irqrestore(&info->lock, flags); |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * ---------------------------------------------------------------------- |
| 229 | * |
| 230 | * Here starts the interrupt handling routines. All of the following |
| 231 | * subroutines are declared as inline and are folded into |
| 232 | * rs_interrupt(). They were separated out for readability's sake. |
| 233 | * |
| 234 | * Note: rs_interrupt() is a "fast" interrupt, which means that it |
| 235 | * runs with interrupts turned off. People who may want to modify |
| 236 | * rs_interrupt() should try to keep the interrupt handler as fast as |
| 237 | * possible. After you are done making modifications, it is not a bad |
| 238 | * idea to do: |
| 239 | * |
| 240 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c |
| 241 | * |
| 242 | * and look at the resulting assemble code in serial.s. |
| 243 | * |
| 244 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 |
| 245 | * ----------------------------------------------------------------------- |
| 246 | */ |
| 247 | |
| 248 | /* |
| 249 | * This routine is used by the interrupt handler to schedule |
| 250 | * processing in the software interrupt portion of the driver. |
| 251 | */ |
| 252 | static inline void rs_sched_event(struct esp_struct *info, |
| 253 | int event) |
| 254 | { |
| 255 | info->event |= 1 << event; |
| 256 | schedule_work(&info->tqueue); |
| 257 | } |
| 258 | |
| 259 | static DEFINE_SPINLOCK(pio_lock); |
| 260 | |
| 261 | static inline struct esp_pio_buffer *get_pio_buffer(void) |
| 262 | { |
| 263 | struct esp_pio_buffer *buf; |
| 264 | unsigned long flags; |
| 265 | |
| 266 | spin_lock_irqsave(&pio_lock, flags); |
| 267 | if (free_pio_buf) { |
| 268 | buf = free_pio_buf; |
| 269 | free_pio_buf = buf->next; |
| 270 | } else { |
| 271 | buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC); |
| 272 | } |
| 273 | spin_unlock_irqrestore(&pio_lock, flags); |
| 274 | return buf; |
| 275 | } |
| 276 | |
| 277 | static inline void release_pio_buffer(struct esp_pio_buffer *buf) |
| 278 | { |
| 279 | unsigned long flags; |
| 280 | spin_lock_irqsave(&pio_lock, flags); |
| 281 | buf->next = free_pio_buf; |
| 282 | free_pio_buf = buf; |
| 283 | spin_unlock_irqrestore(&pio_lock, flags); |
| 284 | } |
| 285 | |
| 286 | static inline void receive_chars_pio(struct esp_struct *info, int num_bytes) |
| 287 | { |
| 288 | struct tty_struct *tty = info->tty; |
| 289 | int i; |
| 290 | struct esp_pio_buffer *pio_buf; |
| 291 | struct esp_pio_buffer *err_buf; |
| 292 | unsigned char status_mask; |
| 293 | |
| 294 | pio_buf = get_pio_buffer(); |
| 295 | |
| 296 | if (!pio_buf) |
| 297 | return; |
| 298 | |
| 299 | err_buf = get_pio_buffer(); |
| 300 | |
| 301 | if (!err_buf) { |
| 302 | release_pio_buffer(pio_buf); |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | status_mask = (info->read_status_mask >> 2) & 0x07; |
| 307 | |
| 308 | for (i = 0; i < num_bytes - 1; i += 2) { |
| 309 | *((unsigned short *)(pio_buf->data + i)) = |
| 310 | inw(info->port + UART_ESI_RX); |
| 311 | err_buf->data[i] = serial_in(info, UART_ESI_RWS); |
| 312 | err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask; |
| 313 | err_buf->data[i] &= status_mask; |
| 314 | } |
| 315 | |
| 316 | if (num_bytes & 0x0001) { |
| 317 | pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX); |
| 318 | err_buf->data[num_bytes - 1] = |
| 319 | (serial_in(info, UART_ESI_RWS) >> 3) & status_mask; |
| 320 | } |
| 321 | |
| 322 | /* make sure everything is still ok since interrupts were enabled */ |
| 323 | tty = info->tty; |
| 324 | |
| 325 | if (!tty) { |
| 326 | release_pio_buffer(pio_buf); |
| 327 | release_pio_buffer(err_buf); |
| 328 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; |
| 329 | return; |
| 330 | } |
| 331 | |
| 332 | status_mask = (info->ignore_status_mask >> 2) & 0x07; |
| 333 | |
| 334 | for (i = 0; i < num_bytes; i++) { |
| 335 | if (!(err_buf->data[i] & status_mask)) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 336 | int flag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | if (err_buf->data[i] & 0x04) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 339 | flag = TTY_BREAK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | if (info->flags & ASYNC_SAK) |
| 341 | do_SAK(tty); |
| 342 | } |
| 343 | else if (err_buf->data[i] & 0x02) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 344 | flag = TTY_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | else if (err_buf->data[i] & 0x01) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 346 | flag = TTY_PARITY; |
| 347 | tty_insert_flip_char(tty, pio_buf->data[i], flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | } |
| 350 | |
Paul Fulghum | 808249c | 2006-02-03 03:04:41 -0800 | [diff] [blame] | 351 | tty_schedule_flip(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; |
| 354 | release_pio_buffer(pio_buf); |
| 355 | release_pio_buffer(err_buf); |
| 356 | } |
| 357 | |
| 358 | static inline void receive_chars_dma(struct esp_struct *info, int num_bytes) |
| 359 | { |
| 360 | unsigned long flags; |
| 361 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; |
| 362 | dma_bytes = num_bytes; |
| 363 | info->stat_flags |= ESP_STAT_DMA_RX; |
| 364 | |
| 365 | flags=claim_dma_lock(); |
| 366 | disable_dma(dma); |
| 367 | clear_dma_ff(dma); |
| 368 | set_dma_mode(dma, DMA_MODE_READ); |
| 369 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); |
| 370 | set_dma_count(dma, dma_bytes); |
| 371 | enable_dma(dma); |
| 372 | release_dma_lock(flags); |
| 373 | |
| 374 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX); |
| 375 | } |
| 376 | |
| 377 | static inline void receive_chars_dma_done(struct esp_struct *info, |
| 378 | int status) |
| 379 | { |
| 380 | struct tty_struct *tty = info->tty; |
| 381 | int num_bytes; |
| 382 | unsigned long flags; |
| 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | flags=claim_dma_lock(); |
| 385 | disable_dma(dma); |
| 386 | clear_dma_ff(dma); |
| 387 | |
| 388 | info->stat_flags &= ~ESP_STAT_DMA_RX; |
| 389 | num_bytes = dma_bytes - get_dma_residue(dma); |
| 390 | release_dma_lock(flags); |
| 391 | |
| 392 | info->icount.rx += num_bytes; |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | if (num_bytes > 0) { |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 395 | tty_insert_flip_string(tty, dma_buffer, num_bytes - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | status &= (0x1c & info->read_status_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 399 | /* Is the status significant or do we throw the last byte ? */ |
| 400 | if (!(status & info->ignore_status_mask)) { |
| 401 | int statflag = 0; |
| 402 | |
| 403 | if (status & 0x10) { |
| 404 | statflag = TTY_BREAK; |
| 405 | (info->icount.brk)++; |
| 406 | if (info->flags & ASYNC_SAK) |
| 407 | do_SAK(tty); |
| 408 | } else if (status & 0x08) { |
| 409 | statflag = TTY_FRAME; |
| 410 | (info->icount.frame)++; |
| 411 | } |
| 412 | else if (status & 0x04) { |
| 413 | statflag = TTY_PARITY; |
| 414 | (info->icount.parity)++; |
| 415 | } |
| 416 | tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag); |
| 417 | } |
Paul Fulghum | 808249c | 2006-02-03 03:04:41 -0800 | [diff] [blame] | 418 | tty_schedule_flip(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | if (dma_bytes != num_bytes) { |
| 422 | num_bytes = dma_bytes - num_bytes; |
| 423 | dma_bytes = 0; |
| 424 | receive_chars_dma(info, num_bytes); |
| 425 | } else |
| 426 | dma_bytes = 0; |
| 427 | } |
| 428 | |
| 429 | /* Caller must hold info->lock */ |
| 430 | |
| 431 | static inline void transmit_chars_pio(struct esp_struct *info, |
| 432 | int space_avail) |
| 433 | { |
| 434 | int i; |
| 435 | struct esp_pio_buffer *pio_buf; |
| 436 | |
| 437 | pio_buf = get_pio_buffer(); |
| 438 | |
| 439 | if (!pio_buf) |
| 440 | return; |
| 441 | |
| 442 | while (space_avail && info->xmit_cnt) { |
| 443 | if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) { |
| 444 | memcpy(pio_buf->data, |
| 445 | &(info->xmit_buf[info->xmit_tail]), |
| 446 | space_avail); |
| 447 | } else { |
| 448 | i = ESP_XMIT_SIZE - info->xmit_tail; |
| 449 | memcpy(pio_buf->data, |
| 450 | &(info->xmit_buf[info->xmit_tail]), i); |
| 451 | memcpy(&(pio_buf->data[i]), info->xmit_buf, |
| 452 | space_avail - i); |
| 453 | } |
| 454 | |
| 455 | info->xmit_cnt -= space_avail; |
| 456 | info->xmit_tail = (info->xmit_tail + space_avail) & |
| 457 | (ESP_XMIT_SIZE - 1); |
| 458 | |
| 459 | for (i = 0; i < space_avail - 1; i += 2) { |
| 460 | outw(*((unsigned short *)(pio_buf->data + i)), |
| 461 | info->port + UART_ESI_TX); |
| 462 | } |
| 463 | |
| 464 | if (space_avail & 0x0001) |
| 465 | serial_out(info, UART_ESI_TX, |
| 466 | pio_buf->data[space_avail - 1]); |
| 467 | |
| 468 | if (info->xmit_cnt) { |
| 469 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); |
| 470 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); |
| 471 | space_avail = serial_in(info, UART_ESI_STAT1) << 8; |
| 472 | space_avail |= serial_in(info, UART_ESI_STAT2); |
| 473 | |
| 474 | if (space_avail > info->xmit_cnt) |
| 475 | space_avail = info->xmit_cnt; |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | if (info->xmit_cnt < WAKEUP_CHARS) { |
| 480 | rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP); |
| 481 | |
| 482 | #ifdef SERIAL_DEBUG_INTR |
| 483 | printk("THRE..."); |
| 484 | #endif |
| 485 | |
| 486 | if (info->xmit_cnt <= 0) { |
| 487 | info->IER &= ~UART_IER_THRI; |
| 488 | serial_out(info, UART_ESI_CMD1, |
| 489 | ESI_SET_SRV_MASK); |
| 490 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | release_pio_buffer(pio_buf); |
| 495 | } |
| 496 | |
| 497 | /* Caller must hold info->lock */ |
| 498 | static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes) |
| 499 | { |
| 500 | unsigned long flags; |
| 501 | |
| 502 | dma_bytes = num_bytes; |
| 503 | |
| 504 | if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) { |
| 505 | memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), |
| 506 | dma_bytes); |
| 507 | } else { |
| 508 | int i = ESP_XMIT_SIZE - info->xmit_tail; |
| 509 | memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), |
| 510 | i); |
| 511 | memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i); |
| 512 | } |
| 513 | |
| 514 | info->xmit_cnt -= dma_bytes; |
| 515 | info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1); |
| 516 | |
| 517 | if (info->xmit_cnt < WAKEUP_CHARS) { |
| 518 | rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP); |
| 519 | |
| 520 | #ifdef SERIAL_DEBUG_INTR |
| 521 | printk("THRE..."); |
| 522 | #endif |
| 523 | |
| 524 | if (info->xmit_cnt <= 0) { |
| 525 | info->IER &= ~UART_IER_THRI; |
| 526 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 527 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | info->stat_flags |= ESP_STAT_DMA_TX; |
| 532 | |
| 533 | flags=claim_dma_lock(); |
| 534 | disable_dma(dma); |
| 535 | clear_dma_ff(dma); |
| 536 | set_dma_mode(dma, DMA_MODE_WRITE); |
| 537 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); |
| 538 | set_dma_count(dma, dma_bytes); |
| 539 | enable_dma(dma); |
| 540 | release_dma_lock(flags); |
| 541 | |
| 542 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); |
| 543 | } |
| 544 | |
| 545 | static inline void transmit_chars_dma_done(struct esp_struct *info) |
| 546 | { |
| 547 | int num_bytes; |
| 548 | unsigned long flags; |
| 549 | |
| 550 | |
| 551 | flags=claim_dma_lock(); |
| 552 | disable_dma(dma); |
| 553 | clear_dma_ff(dma); |
| 554 | |
| 555 | num_bytes = dma_bytes - get_dma_residue(dma); |
| 556 | info->icount.tx += dma_bytes; |
| 557 | release_dma_lock(flags); |
| 558 | |
| 559 | if (dma_bytes != num_bytes) { |
| 560 | dma_bytes -= num_bytes; |
| 561 | memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes); |
| 562 | |
| 563 | flags=claim_dma_lock(); |
| 564 | disable_dma(dma); |
| 565 | clear_dma_ff(dma); |
| 566 | set_dma_mode(dma, DMA_MODE_WRITE); |
| 567 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); |
| 568 | set_dma_count(dma, dma_bytes); |
| 569 | enable_dma(dma); |
| 570 | release_dma_lock(flags); |
| 571 | |
| 572 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); |
| 573 | } else { |
| 574 | dma_bytes = 0; |
| 575 | info->stat_flags &= ~ESP_STAT_DMA_TX; |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | static inline void check_modem_status(struct esp_struct *info) |
| 580 | { |
| 581 | int status; |
| 582 | |
| 583 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); |
| 584 | status = serial_in(info, UART_ESI_STAT2); |
| 585 | |
| 586 | if (status & UART_MSR_ANY_DELTA) { |
| 587 | /* update input line counters */ |
| 588 | if (status & UART_MSR_TERI) |
| 589 | info->icount.rng++; |
| 590 | if (status & UART_MSR_DDSR) |
| 591 | info->icount.dsr++; |
| 592 | if (status & UART_MSR_DDCD) |
| 593 | info->icount.dcd++; |
| 594 | if (status & UART_MSR_DCTS) |
| 595 | info->icount.cts++; |
| 596 | wake_up_interruptible(&info->delta_msr_wait); |
| 597 | } |
| 598 | |
| 599 | if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) { |
| 600 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) |
| 601 | printk("ttys%d CD now %s...", info->line, |
| 602 | (status & UART_MSR_DCD) ? "on" : "off"); |
| 603 | #endif |
| 604 | if (status & UART_MSR_DCD) |
| 605 | wake_up_interruptible(&info->open_wait); |
| 606 | else { |
| 607 | #ifdef SERIAL_DEBUG_OPEN |
| 608 | printk("scheduling hangup..."); |
| 609 | #endif |
| 610 | schedule_work(&info->tqueue_hangup); |
| 611 | } |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * This is the serial driver's interrupt routine |
| 617 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame^] | 618 | static irqreturn_t rs_interrupt_single(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
| 620 | struct esp_struct * info; |
| 621 | unsigned err_status; |
| 622 | unsigned int scratch; |
| 623 | |
| 624 | #ifdef SERIAL_DEBUG_INTR |
| 625 | printk("rs_interrupt_single(%d)...", irq); |
| 626 | #endif |
| 627 | info = (struct esp_struct *)dev_id; |
| 628 | err_status = 0; |
| 629 | scratch = serial_in(info, UART_ESI_SID); |
| 630 | |
| 631 | spin_lock(&info->lock); |
| 632 | |
| 633 | if (!info->tty) { |
| 634 | spin_unlock(&info->lock); |
| 635 | return IRQ_NONE; |
| 636 | } |
| 637 | |
| 638 | if (scratch & 0x04) { /* error */ |
| 639 | serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT); |
| 640 | err_status = serial_in(info, UART_ESI_STAT1); |
| 641 | serial_in(info, UART_ESI_STAT2); |
| 642 | |
| 643 | if (err_status & 0x01) |
| 644 | info->stat_flags |= ESP_STAT_RX_TIMEOUT; |
| 645 | |
| 646 | if (err_status & 0x20) /* UART status */ |
| 647 | check_modem_status(info); |
| 648 | |
| 649 | if (err_status & 0x80) /* Start break */ |
| 650 | wake_up_interruptible(&info->break_wait); |
| 651 | } |
| 652 | |
| 653 | if ((scratch & 0x88) || /* DMA completed or timed out */ |
| 654 | (err_status & 0x1c) /* receive error */) { |
| 655 | if (info->stat_flags & ESP_STAT_DMA_RX) |
| 656 | receive_chars_dma_done(info, err_status); |
| 657 | else if (info->stat_flags & ESP_STAT_DMA_TX) |
| 658 | transmit_chars_dma_done(info); |
| 659 | } |
| 660 | |
| 661 | if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && |
| 662 | ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) && |
| 663 | (info->IER & UART_IER_RDI)) { |
| 664 | int num_bytes; |
| 665 | |
| 666 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); |
| 667 | serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); |
| 668 | num_bytes = serial_in(info, UART_ESI_STAT1) << 8; |
| 669 | num_bytes |= serial_in(info, UART_ESI_STAT2); |
| 670 | |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 671 | num_bytes = tty_buffer_request_room(info->tty, num_bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | if (num_bytes) { |
| 674 | if (dma_bytes || |
| 675 | (info->stat_flags & ESP_STAT_USE_PIO) || |
| 676 | (num_bytes <= info->config.pio_threshold)) |
| 677 | receive_chars_pio(info, num_bytes); |
| 678 | else |
| 679 | receive_chars_dma(info, num_bytes); |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && |
| 684 | (scratch & 0x02) && (info->IER & UART_IER_THRI)) { |
| 685 | if ((info->xmit_cnt <= 0) || info->tty->stopped) { |
| 686 | info->IER &= ~UART_IER_THRI; |
| 687 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 688 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 689 | } else { |
| 690 | int num_bytes; |
| 691 | |
| 692 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); |
| 693 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); |
| 694 | num_bytes = serial_in(info, UART_ESI_STAT1) << 8; |
| 695 | num_bytes |= serial_in(info, UART_ESI_STAT2); |
| 696 | |
| 697 | if (num_bytes > info->xmit_cnt) |
| 698 | num_bytes = info->xmit_cnt; |
| 699 | |
| 700 | if (num_bytes) { |
| 701 | if (dma_bytes || |
| 702 | (info->stat_flags & ESP_STAT_USE_PIO) || |
| 703 | (num_bytes <= info->config.pio_threshold)) |
| 704 | transmit_chars_pio(info, num_bytes); |
| 705 | else |
| 706 | transmit_chars_dma(info, num_bytes); |
| 707 | } |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | info->last_active = jiffies; |
| 712 | |
| 713 | #ifdef SERIAL_DEBUG_INTR |
| 714 | printk("end.\n"); |
| 715 | #endif |
| 716 | spin_unlock(&info->lock); |
| 717 | return IRQ_HANDLED; |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * ------------------------------------------------------------------- |
| 722 | * Here ends the serial interrupt routines. |
| 723 | * ------------------------------------------------------------------- |
| 724 | */ |
| 725 | |
| 726 | static void do_softint(void *private_) |
| 727 | { |
| 728 | struct esp_struct *info = (struct esp_struct *) private_; |
| 729 | struct tty_struct *tty; |
| 730 | |
| 731 | tty = info->tty; |
| 732 | if (!tty) |
| 733 | return; |
| 734 | |
| 735 | if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) { |
| 736 | tty_wakeup(tty); |
| 737 | } |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * This routine is called from the scheduler tqueue when the interrupt |
| 742 | * routine has signalled that a hangup has occurred. The path of |
| 743 | * hangup processing is: |
| 744 | * |
| 745 | * serial interrupt routine -> (scheduler tqueue) -> |
| 746 | * do_serial_hangup() -> tty->hangup() -> esp_hangup() |
| 747 | * |
| 748 | */ |
| 749 | static void do_serial_hangup(void *private_) |
| 750 | { |
| 751 | struct esp_struct *info = (struct esp_struct *) private_; |
| 752 | struct tty_struct *tty; |
| 753 | |
| 754 | tty = info->tty; |
| 755 | if (tty) |
| 756 | tty_hangup(tty); |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * --------------------------------------------------------------- |
| 761 | * Low level utility subroutines for the serial driver: routines to |
| 762 | * figure out the appropriate timeout for an interrupt chain, routines |
| 763 | * to initialize and startup a serial port, and routines to shutdown a |
| 764 | * serial port. Useful stuff like that. |
| 765 | * |
| 766 | * Caller should hold lock |
| 767 | * --------------------------------------------------------------- |
| 768 | */ |
| 769 | |
| 770 | static inline void esp_basic_init(struct esp_struct * info) |
| 771 | { |
| 772 | /* put ESPC in enhanced mode */ |
| 773 | serial_out(info, UART_ESI_CMD1, ESI_SET_MODE); |
| 774 | |
| 775 | if (info->stat_flags & ESP_STAT_NEVER_DMA) |
| 776 | serial_out(info, UART_ESI_CMD2, 0x01); |
| 777 | else |
| 778 | serial_out(info, UART_ESI_CMD2, 0x31); |
| 779 | |
| 780 | /* disable interrupts for now */ |
| 781 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 782 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 783 | |
| 784 | /* set interrupt and DMA channel */ |
| 785 | serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ); |
| 786 | |
| 787 | if (info->stat_flags & ESP_STAT_NEVER_DMA) |
| 788 | serial_out(info, UART_ESI_CMD2, 0x01); |
| 789 | else |
| 790 | serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01); |
| 791 | |
| 792 | serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); |
| 793 | |
| 794 | if (info->line % 8) /* secondary port */ |
| 795 | serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */ |
| 796 | else if (info->irq == 9) |
| 797 | serial_out(info, UART_ESI_CMD2, 0x02); |
| 798 | else |
| 799 | serial_out(info, UART_ESI_CMD2, info->irq); |
| 800 | |
| 801 | /* set error status mask (check this) */ |
| 802 | serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK); |
| 803 | |
| 804 | if (info->stat_flags & ESP_STAT_NEVER_DMA) |
| 805 | serial_out(info, UART_ESI_CMD2, 0xa1); |
| 806 | else |
| 807 | serial_out(info, UART_ESI_CMD2, 0xbd); |
| 808 | |
| 809 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 810 | |
| 811 | /* set DMA timeout */ |
| 812 | serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT); |
| 813 | serial_out(info, UART_ESI_CMD2, 0xff); |
| 814 | |
| 815 | /* set FIFO trigger levels */ |
| 816 | serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); |
| 817 | serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8); |
| 818 | serial_out(info, UART_ESI_CMD2, info->config.rx_trigger); |
| 819 | serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8); |
| 820 | serial_out(info, UART_ESI_CMD2, info->config.tx_trigger); |
| 821 | |
| 822 | /* Set clock scaling and wait states */ |
| 823 | serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR); |
| 824 | serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE); |
| 825 | |
| 826 | /* set reinterrupt pacing */ |
| 827 | serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR); |
| 828 | serial_out(info, UART_ESI_CMD2, 0xff); |
| 829 | } |
| 830 | |
| 831 | static int startup(struct esp_struct * info) |
| 832 | { |
| 833 | unsigned long flags; |
| 834 | int retval=0; |
| 835 | unsigned int num_chars; |
| 836 | |
| 837 | spin_lock_irqsave(&info->lock, flags); |
| 838 | |
| 839 | if (info->flags & ASYNC_INITIALIZED) |
| 840 | goto out; |
| 841 | |
| 842 | if (!info->xmit_buf) { |
| 843 | info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC); |
| 844 | retval = -ENOMEM; |
| 845 | if (!info->xmit_buf) |
| 846 | goto out; |
| 847 | } |
| 848 | |
| 849 | #ifdef SERIAL_DEBUG_OPEN |
| 850 | printk("starting up ttys%d (irq %d)...", info->line, info->irq); |
| 851 | #endif |
| 852 | |
| 853 | /* Flush the RX buffer. Using the ESI flush command may cause */ |
| 854 | /* wild interrupts, so read all the data instead. */ |
| 855 | |
| 856 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); |
| 857 | serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); |
| 858 | num_chars = serial_in(info, UART_ESI_STAT1) << 8; |
| 859 | num_chars |= serial_in(info, UART_ESI_STAT2); |
| 860 | |
| 861 | while (num_chars > 1) { |
| 862 | inw(info->port + UART_ESI_RX); |
| 863 | num_chars -= 2; |
| 864 | } |
| 865 | |
| 866 | if (num_chars) |
| 867 | serial_in(info, UART_ESI_RX); |
| 868 | |
| 869 | /* set receive character timeout */ |
| 870 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); |
| 871 | serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); |
| 872 | |
| 873 | /* clear all flags except the "never DMA" flag */ |
| 874 | info->stat_flags &= ESP_STAT_NEVER_DMA; |
| 875 | |
| 876 | if (info->stat_flags & ESP_STAT_NEVER_DMA) |
| 877 | info->stat_flags |= ESP_STAT_USE_PIO; |
| 878 | |
| 879 | spin_unlock_irqrestore(&info->lock, flags); |
| 880 | |
| 881 | /* |
| 882 | * Allocate the IRQ |
| 883 | */ |
| 884 | |
Thomas Gleixner | 0f2ed4c | 2006-07-01 19:29:33 -0700 | [diff] [blame] | 885 | retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | "esp serial", info); |
| 887 | |
| 888 | if (retval) { |
| 889 | if (capable(CAP_SYS_ADMIN)) { |
| 890 | if (info->tty) |
| 891 | set_bit(TTY_IO_ERROR, |
| 892 | &info->tty->flags); |
| 893 | retval = 0; |
| 894 | } |
| 895 | goto out_unlocked; |
| 896 | } |
| 897 | |
| 898 | if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) { |
| 899 | dma_buffer = (char *)__get_dma_pages( |
| 900 | GFP_KERNEL, get_order(DMA_BUFFER_SZ)); |
| 901 | |
| 902 | /* use PIO mode if DMA buf/chan cannot be allocated */ |
| 903 | if (!dma_buffer) |
| 904 | info->stat_flags |= ESP_STAT_USE_PIO; |
| 905 | else if (request_dma(dma, "esp serial")) { |
| 906 | free_pages((unsigned long)dma_buffer, |
| 907 | get_order(DMA_BUFFER_SZ)); |
| 908 | dma_buffer = NULL; |
| 909 | info->stat_flags |= ESP_STAT_USE_PIO; |
| 910 | } |
| 911 | |
| 912 | } |
| 913 | |
| 914 | info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2; |
| 915 | |
| 916 | spin_lock_irqsave(&info->lock, flags); |
| 917 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 918 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 919 | serial_out(info, UART_ESI_CMD2, info->MCR); |
| 920 | |
| 921 | /* |
| 922 | * Finally, enable interrupts |
| 923 | */ |
| 924 | /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */ |
| 925 | info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT | |
| 926 | UART_IER_DMA_TC; |
| 927 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 928 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 929 | |
| 930 | if (info->tty) |
| 931 | clear_bit(TTY_IO_ERROR, &info->tty->flags); |
| 932 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
| 933 | spin_unlock_irqrestore(&info->lock, flags); |
| 934 | |
| 935 | /* |
| 936 | * Set up the tty->alt_speed kludge |
| 937 | */ |
| 938 | if (info->tty) { |
| 939 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
| 940 | info->tty->alt_speed = 57600; |
| 941 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
| 942 | info->tty->alt_speed = 115200; |
| 943 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
| 944 | info->tty->alt_speed = 230400; |
| 945 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
| 946 | info->tty->alt_speed = 460800; |
| 947 | } |
| 948 | |
| 949 | /* |
| 950 | * set the speed of the serial port |
| 951 | */ |
| 952 | change_speed(info); |
| 953 | info->flags |= ASYNC_INITIALIZED; |
| 954 | return 0; |
| 955 | |
| 956 | out: |
| 957 | spin_unlock_irqrestore(&info->lock, flags); |
| 958 | out_unlocked: |
| 959 | return retval; |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 964 | * DTR is dropped if the hangup on close termio flag is on. |
| 965 | */ |
| 966 | static void shutdown(struct esp_struct * info) |
| 967 | { |
| 968 | unsigned long flags, f; |
| 969 | |
| 970 | if (!(info->flags & ASYNC_INITIALIZED)) |
| 971 | return; |
| 972 | |
| 973 | #ifdef SERIAL_DEBUG_OPEN |
| 974 | printk("Shutting down serial port %d (irq %d)....", info->line, |
| 975 | info->irq); |
| 976 | #endif |
| 977 | |
| 978 | spin_lock_irqsave(&info->lock, flags); |
| 979 | /* |
| 980 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq |
| 981 | * here so the queue might never be waken up |
| 982 | */ |
| 983 | wake_up_interruptible(&info->delta_msr_wait); |
| 984 | wake_up_interruptible(&info->break_wait); |
| 985 | |
| 986 | /* stop a DMA transfer on the port being closed */ |
| 987 | /* DMA lock is higher priority always */ |
| 988 | if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) { |
| 989 | f=claim_dma_lock(); |
| 990 | disable_dma(dma); |
| 991 | clear_dma_ff(dma); |
| 992 | release_dma_lock(f); |
| 993 | |
| 994 | dma_bytes = 0; |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * Free the IRQ |
| 999 | */ |
| 1000 | free_irq(info->irq, info); |
| 1001 | |
| 1002 | if (dma_buffer) { |
| 1003 | struct esp_struct *current_port = ports; |
| 1004 | |
| 1005 | while (current_port) { |
| 1006 | if ((current_port != info) && |
| 1007 | (current_port->flags & ASYNC_INITIALIZED)) |
| 1008 | break; |
| 1009 | |
| 1010 | current_port = current_port->next_port; |
| 1011 | } |
| 1012 | |
| 1013 | if (!current_port) { |
| 1014 | free_dma(dma); |
| 1015 | free_pages((unsigned long)dma_buffer, |
| 1016 | get_order(DMA_BUFFER_SZ)); |
| 1017 | dma_buffer = NULL; |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | if (info->xmit_buf) { |
| 1022 | free_page((unsigned long) info->xmit_buf); |
| 1023 | info->xmit_buf = NULL; |
| 1024 | } |
| 1025 | |
| 1026 | info->IER = 0; |
| 1027 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 1028 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 1029 | |
| 1030 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) |
| 1031 | info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); |
| 1032 | |
| 1033 | info->MCR &= ~UART_MCR_OUT2; |
| 1034 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 1035 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 1036 | serial_out(info, UART_ESI_CMD2, info->MCR); |
| 1037 | |
| 1038 | if (info->tty) |
| 1039 | set_bit(TTY_IO_ERROR, &info->tty->flags); |
| 1040 | |
| 1041 | info->flags &= ~ASYNC_INITIALIZED; |
| 1042 | spin_unlock_irqrestore(&info->lock, flags); |
| 1043 | } |
| 1044 | |
| 1045 | /* |
| 1046 | * This routine is called to set the UART divisor registers to match |
| 1047 | * the specified baud rate for a serial port. |
| 1048 | */ |
| 1049 | static void change_speed(struct esp_struct *info) |
| 1050 | { |
| 1051 | unsigned short port; |
| 1052 | int quot = 0; |
| 1053 | unsigned cflag,cval; |
| 1054 | int baud, bits; |
| 1055 | unsigned char flow1 = 0, flow2 = 0; |
| 1056 | unsigned long flags; |
| 1057 | |
| 1058 | if (!info->tty || !info->tty->termios) |
| 1059 | return; |
| 1060 | cflag = info->tty->termios->c_cflag; |
| 1061 | port = info->port; |
| 1062 | |
| 1063 | /* byte size and parity */ |
| 1064 | switch (cflag & CSIZE) { |
| 1065 | case CS5: cval = 0x00; bits = 7; break; |
| 1066 | case CS6: cval = 0x01; bits = 8; break; |
| 1067 | case CS7: cval = 0x02; bits = 9; break; |
| 1068 | case CS8: cval = 0x03; bits = 10; break; |
| 1069 | default: cval = 0x00; bits = 7; break; |
| 1070 | } |
| 1071 | if (cflag & CSTOPB) { |
| 1072 | cval |= 0x04; |
| 1073 | bits++; |
| 1074 | } |
| 1075 | if (cflag & PARENB) { |
| 1076 | cval |= UART_LCR_PARITY; |
| 1077 | bits++; |
| 1078 | } |
| 1079 | if (!(cflag & PARODD)) |
| 1080 | cval |= UART_LCR_EPAR; |
| 1081 | #ifdef CMSPAR |
| 1082 | if (cflag & CMSPAR) |
| 1083 | cval |= UART_LCR_SPAR; |
| 1084 | #endif |
| 1085 | |
| 1086 | baud = tty_get_baud_rate(info->tty); |
| 1087 | if (baud == 38400 && |
| 1088 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) |
| 1089 | quot = info->custom_divisor; |
| 1090 | else { |
| 1091 | if (baud == 134) |
| 1092 | /* Special case since 134 is really 134.5 */ |
| 1093 | quot = (2*BASE_BAUD / 269); |
| 1094 | else if (baud) |
| 1095 | quot = BASE_BAUD / baud; |
| 1096 | } |
| 1097 | /* If the quotient is ever zero, default to 9600 bps */ |
| 1098 | if (!quot) |
| 1099 | quot = BASE_BAUD / 9600; |
| 1100 | |
| 1101 | info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50); |
| 1102 | |
| 1103 | /* CTS flow control flag and modem status interrupts */ |
| 1104 | /* info->IER &= ~UART_IER_MSI; */ |
| 1105 | if (cflag & CRTSCTS) { |
| 1106 | info->flags |= ASYNC_CTS_FLOW; |
| 1107 | /* info->IER |= UART_IER_MSI; */ |
| 1108 | flow1 = 0x04; |
| 1109 | flow2 = 0x10; |
| 1110 | } else |
| 1111 | info->flags &= ~ASYNC_CTS_FLOW; |
| 1112 | if (cflag & CLOCAL) |
| 1113 | info->flags &= ~ASYNC_CHECK_CD; |
| 1114 | else { |
| 1115 | info->flags |= ASYNC_CHECK_CD; |
| 1116 | /* info->IER |= UART_IER_MSI; */ |
| 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * Set up parity check flag |
| 1121 | */ |
| 1122 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
| 1123 | |
| 1124 | info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
| 1125 | if (I_INPCK(info->tty)) |
| 1126 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
| 1127 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) |
| 1128 | info->read_status_mask |= UART_LSR_BI; |
| 1129 | |
| 1130 | info->ignore_status_mask = 0; |
| 1131 | #if 0 |
| 1132 | /* This should be safe, but for some broken bits of hardware... */ |
| 1133 | if (I_IGNPAR(info->tty)) { |
| 1134 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| 1135 | info->read_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| 1136 | } |
| 1137 | #endif |
| 1138 | if (I_IGNBRK(info->tty)) { |
| 1139 | info->ignore_status_mask |= UART_LSR_BI; |
| 1140 | info->read_status_mask |= UART_LSR_BI; |
| 1141 | /* |
| 1142 | * If we're ignore parity and break indicators, ignore |
| 1143 | * overruns too. (For real raw support). |
| 1144 | */ |
| 1145 | if (I_IGNPAR(info->tty)) { |
| 1146 | info->ignore_status_mask |= UART_LSR_OE | \ |
| 1147 | UART_LSR_PE | UART_LSR_FE; |
| 1148 | info->read_status_mask |= UART_LSR_OE | \ |
| 1149 | UART_LSR_PE | UART_LSR_FE; |
| 1150 | } |
| 1151 | } |
| 1152 | |
| 1153 | if (I_IXOFF(info->tty)) |
| 1154 | flow1 |= 0x81; |
| 1155 | |
| 1156 | spin_lock_irqsave(&info->lock, flags); |
| 1157 | /* set baud */ |
| 1158 | serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD); |
| 1159 | serial_out(info, UART_ESI_CMD2, quot >> 8); |
| 1160 | serial_out(info, UART_ESI_CMD2, quot & 0xff); |
| 1161 | |
| 1162 | /* set data bits, parity, etc. */ |
| 1163 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 1164 | serial_out(info, UART_ESI_CMD2, UART_LCR); |
| 1165 | serial_out(info, UART_ESI_CMD2, cval); |
| 1166 | |
| 1167 | /* Enable flow control */ |
| 1168 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL); |
| 1169 | serial_out(info, UART_ESI_CMD2, flow1); |
| 1170 | serial_out(info, UART_ESI_CMD2, flow2); |
| 1171 | |
| 1172 | /* set flow control characters (XON/XOFF only) */ |
| 1173 | if (I_IXOFF(info->tty)) { |
| 1174 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS); |
| 1175 | serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty)); |
| 1176 | serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty)); |
| 1177 | serial_out(info, UART_ESI_CMD2, 0x10); |
| 1178 | serial_out(info, UART_ESI_CMD2, 0x21); |
| 1179 | switch (cflag & CSIZE) { |
| 1180 | case CS5: |
| 1181 | serial_out(info, UART_ESI_CMD2, 0x1f); |
| 1182 | break; |
| 1183 | case CS6: |
| 1184 | serial_out(info, UART_ESI_CMD2, 0x3f); |
| 1185 | break; |
| 1186 | case CS7: |
| 1187 | case CS8: |
| 1188 | serial_out(info, UART_ESI_CMD2, 0x7f); |
| 1189 | break; |
| 1190 | default: |
| 1191 | serial_out(info, UART_ESI_CMD2, 0xff); |
| 1192 | break; |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | /* Set high/low water */ |
| 1197 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); |
| 1198 | serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8); |
| 1199 | serial_out(info, UART_ESI_CMD2, info->config.flow_off); |
| 1200 | serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8); |
| 1201 | serial_out(info, UART_ESI_CMD2, info->config.flow_on); |
| 1202 | |
| 1203 | spin_unlock_irqrestore(&info->lock, flags); |
| 1204 | } |
| 1205 | |
| 1206 | static void rs_put_char(struct tty_struct *tty, unsigned char ch) |
| 1207 | { |
| 1208 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1209 | unsigned long flags; |
| 1210 | |
| 1211 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
| 1212 | return; |
| 1213 | |
Eric Sesterhenn | a2f20c7 | 2006-06-25 05:48:46 -0700 | [diff] [blame] | 1214 | if (!info->xmit_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | return; |
| 1216 | |
| 1217 | spin_lock_irqsave(&info->lock, flags); |
| 1218 | if (info->xmit_cnt < ESP_XMIT_SIZE - 1) { |
| 1219 | info->xmit_buf[info->xmit_head++] = ch; |
| 1220 | info->xmit_head &= ESP_XMIT_SIZE-1; |
| 1221 | info->xmit_cnt++; |
| 1222 | } |
| 1223 | spin_unlock_irqrestore(&info->lock, flags); |
| 1224 | } |
| 1225 | |
| 1226 | static void rs_flush_chars(struct tty_struct *tty) |
| 1227 | { |
| 1228 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1229 | unsigned long flags; |
| 1230 | |
| 1231 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) |
| 1232 | return; |
| 1233 | |
| 1234 | spin_lock_irqsave(&info->lock, flags); |
| 1235 | |
| 1236 | if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf) |
| 1237 | goto out; |
| 1238 | |
| 1239 | if (!(info->IER & UART_IER_THRI)) { |
| 1240 | info->IER |= UART_IER_THRI; |
| 1241 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 1242 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 1243 | } |
| 1244 | out: |
| 1245 | spin_unlock_irqrestore(&info->lock, flags); |
| 1246 | } |
| 1247 | |
| 1248 | static int rs_write(struct tty_struct * tty, |
| 1249 | const unsigned char *buf, int count) |
| 1250 | { |
| 1251 | int c, t, ret = 0; |
| 1252 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1253 | unsigned long flags; |
| 1254 | |
| 1255 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
| 1256 | return 0; |
| 1257 | |
Eric Sesterhenn | a2f20c7 | 2006-06-25 05:48:46 -0700 | [diff] [blame] | 1258 | if (!info->xmit_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | return 0; |
| 1260 | |
| 1261 | while (1) { |
| 1262 | /* Thanks to R. Wolff for suggesting how to do this with */ |
| 1263 | /* interrupts enabled */ |
| 1264 | |
| 1265 | c = count; |
| 1266 | t = ESP_XMIT_SIZE - info->xmit_cnt - 1; |
| 1267 | |
| 1268 | if (t < c) |
| 1269 | c = t; |
| 1270 | |
| 1271 | t = ESP_XMIT_SIZE - info->xmit_head; |
| 1272 | |
| 1273 | if (t < c) |
| 1274 | c = t; |
| 1275 | |
| 1276 | if (c <= 0) |
| 1277 | break; |
| 1278 | |
| 1279 | memcpy(info->xmit_buf + info->xmit_head, buf, c); |
| 1280 | |
| 1281 | info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1); |
| 1282 | info->xmit_cnt += c; |
| 1283 | buf += c; |
| 1284 | count -= c; |
| 1285 | ret += c; |
| 1286 | } |
| 1287 | |
| 1288 | spin_lock_irqsave(&info->lock, flags); |
| 1289 | |
| 1290 | if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) { |
| 1291 | info->IER |= UART_IER_THRI; |
| 1292 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 1293 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 1294 | } |
| 1295 | |
| 1296 | spin_unlock_irqrestore(&info->lock, flags); |
| 1297 | return ret; |
| 1298 | } |
| 1299 | |
| 1300 | static int rs_write_room(struct tty_struct *tty) |
| 1301 | { |
| 1302 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1303 | int ret; |
| 1304 | unsigned long flags; |
| 1305 | |
| 1306 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) |
| 1307 | return 0; |
| 1308 | |
| 1309 | spin_lock_irqsave(&info->lock, flags); |
| 1310 | |
| 1311 | ret = ESP_XMIT_SIZE - info->xmit_cnt - 1; |
| 1312 | if (ret < 0) |
| 1313 | ret = 0; |
| 1314 | spin_unlock_irqrestore(&info->lock, flags); |
| 1315 | return ret; |
| 1316 | } |
| 1317 | |
| 1318 | static int rs_chars_in_buffer(struct tty_struct *tty) |
| 1319 | { |
| 1320 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1321 | |
| 1322 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) |
| 1323 | return 0; |
| 1324 | return info->xmit_cnt; |
| 1325 | } |
| 1326 | |
| 1327 | static void rs_flush_buffer(struct tty_struct *tty) |
| 1328 | { |
| 1329 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1330 | unsigned long flags; |
| 1331 | |
| 1332 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) |
| 1333 | return; |
| 1334 | spin_lock_irqsave(&info->lock, flags); |
| 1335 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
| 1336 | spin_unlock_irqrestore(&info->lock, flags); |
| 1337 | tty_wakeup(tty); |
| 1338 | } |
| 1339 | |
| 1340 | /* |
| 1341 | * ------------------------------------------------------------ |
| 1342 | * rs_throttle() |
| 1343 | * |
| 1344 | * This routine is called by the upper-layer tty layer to signal that |
| 1345 | * incoming characters should be throttled. |
| 1346 | * ------------------------------------------------------------ |
| 1347 | */ |
| 1348 | static void rs_throttle(struct tty_struct * tty) |
| 1349 | { |
| 1350 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1351 | unsigned long flags; |
| 1352 | #ifdef SERIAL_DEBUG_THROTTLE |
| 1353 | char buf[64]; |
| 1354 | |
| 1355 | printk("throttle %s: %d....\n", tty_name(tty, buf), |
| 1356 | tty->ldisc.chars_in_buffer(tty)); |
| 1357 | #endif |
| 1358 | |
| 1359 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) |
| 1360 | return; |
| 1361 | |
| 1362 | spin_lock_irqsave(&info->lock, flags); |
| 1363 | info->IER &= ~UART_IER_RDI; |
| 1364 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 1365 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 1366 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); |
| 1367 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 1368 | spin_unlock_irqrestore(&info->lock, flags); |
| 1369 | } |
| 1370 | |
| 1371 | static void rs_unthrottle(struct tty_struct * tty) |
| 1372 | { |
| 1373 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1374 | unsigned long flags; |
| 1375 | #ifdef SERIAL_DEBUG_THROTTLE |
| 1376 | char buf[64]; |
| 1377 | |
| 1378 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), |
| 1379 | tty->ldisc.chars_in_buffer(tty)); |
| 1380 | #endif |
| 1381 | |
| 1382 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) |
| 1383 | return; |
| 1384 | |
| 1385 | spin_lock_irqsave(&info->lock, flags); |
| 1386 | info->IER |= UART_IER_RDI; |
| 1387 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 1388 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 1389 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); |
| 1390 | serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); |
| 1391 | spin_unlock_irqrestore(&info->lock, flags); |
| 1392 | } |
| 1393 | |
| 1394 | /* |
| 1395 | * ------------------------------------------------------------ |
| 1396 | * rs_ioctl() and friends |
| 1397 | * ------------------------------------------------------------ |
| 1398 | */ |
| 1399 | |
| 1400 | static int get_serial_info(struct esp_struct * info, |
| 1401 | struct serial_struct __user *retinfo) |
| 1402 | { |
| 1403 | struct serial_struct tmp; |
| 1404 | |
| 1405 | memset(&tmp, 0, sizeof(tmp)); |
| 1406 | tmp.type = PORT_16550A; |
| 1407 | tmp.line = info->line; |
| 1408 | tmp.port = info->port; |
| 1409 | tmp.irq = info->irq; |
| 1410 | tmp.flags = info->flags; |
| 1411 | tmp.xmit_fifo_size = 1024; |
| 1412 | tmp.baud_base = BASE_BAUD; |
| 1413 | tmp.close_delay = info->close_delay; |
| 1414 | tmp.closing_wait = info->closing_wait; |
| 1415 | tmp.custom_divisor = info->custom_divisor; |
| 1416 | tmp.hub6 = 0; |
| 1417 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) |
| 1418 | return -EFAULT; |
| 1419 | return 0; |
| 1420 | } |
| 1421 | |
| 1422 | static int get_esp_config(struct esp_struct * info, |
| 1423 | struct hayes_esp_config __user *retinfo) |
| 1424 | { |
| 1425 | struct hayes_esp_config tmp; |
| 1426 | |
| 1427 | if (!retinfo) |
| 1428 | return -EFAULT; |
| 1429 | |
| 1430 | memset(&tmp, 0, sizeof(tmp)); |
| 1431 | tmp.rx_timeout = info->config.rx_timeout; |
| 1432 | tmp.rx_trigger = info->config.rx_trigger; |
| 1433 | tmp.tx_trigger = info->config.tx_trigger; |
| 1434 | tmp.flow_off = info->config.flow_off; |
| 1435 | tmp.flow_on = info->config.flow_on; |
| 1436 | tmp.pio_threshold = info->config.pio_threshold; |
| 1437 | tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma); |
| 1438 | |
| 1439 | return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; |
| 1440 | } |
| 1441 | |
| 1442 | static int set_serial_info(struct esp_struct * info, |
| 1443 | struct serial_struct __user *new_info) |
| 1444 | { |
| 1445 | struct serial_struct new_serial; |
| 1446 | struct esp_struct old_info; |
| 1447 | unsigned int change_irq; |
| 1448 | int retval = 0; |
| 1449 | struct esp_struct *current_async; |
| 1450 | |
| 1451 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) |
| 1452 | return -EFAULT; |
| 1453 | old_info = *info; |
| 1454 | |
| 1455 | if ((new_serial.type != PORT_16550A) || |
| 1456 | (new_serial.hub6) || |
| 1457 | (info->port != new_serial.port) || |
| 1458 | (new_serial.baud_base != BASE_BAUD) || |
| 1459 | (new_serial.irq > 15) || |
| 1460 | (new_serial.irq < 2) || |
| 1461 | (new_serial.irq == 6) || |
| 1462 | (new_serial.irq == 8) || |
| 1463 | (new_serial.irq == 13)) |
| 1464 | return -EINVAL; |
| 1465 | |
| 1466 | change_irq = new_serial.irq != info->irq; |
| 1467 | |
| 1468 | if (change_irq && (info->line % 8)) |
| 1469 | return -EINVAL; |
| 1470 | |
| 1471 | if (!capable(CAP_SYS_ADMIN)) { |
| 1472 | if (change_irq || |
| 1473 | (new_serial.close_delay != info->close_delay) || |
| 1474 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
| 1475 | (info->flags & ~ASYNC_USR_MASK))) |
| 1476 | return -EPERM; |
| 1477 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | |
| 1478 | (new_serial.flags & ASYNC_USR_MASK)); |
| 1479 | info->custom_divisor = new_serial.custom_divisor; |
| 1480 | } else { |
| 1481 | if (new_serial.irq == 2) |
| 1482 | new_serial.irq = 9; |
| 1483 | |
| 1484 | if (change_irq) { |
| 1485 | current_async = ports; |
| 1486 | |
| 1487 | while (current_async) { |
| 1488 | if ((current_async->line >= info->line) && |
| 1489 | (current_async->line < (info->line + 8))) { |
| 1490 | if (current_async == info) { |
| 1491 | if (current_async->count > 1) |
| 1492 | return -EBUSY; |
| 1493 | } else if (current_async->count) |
| 1494 | return -EBUSY; |
| 1495 | } |
| 1496 | |
| 1497 | current_async = current_async->next_port; |
| 1498 | } |
| 1499 | } |
| 1500 | |
| 1501 | /* |
| 1502 | * OK, past this point, all the error checking has been done. |
| 1503 | * At this point, we start making changes..... |
| 1504 | */ |
| 1505 | |
| 1506 | info->flags = ((info->flags & ~ASYNC_FLAGS) | |
| 1507 | (new_serial.flags & ASYNC_FLAGS)); |
| 1508 | info->custom_divisor = new_serial.custom_divisor; |
| 1509 | info->close_delay = new_serial.close_delay * HZ/100; |
| 1510 | info->closing_wait = new_serial.closing_wait * HZ/100; |
| 1511 | |
| 1512 | if (change_irq) { |
| 1513 | /* |
| 1514 | * We need to shutdown the serial port at the old |
| 1515 | * port/irq combination. |
| 1516 | */ |
| 1517 | shutdown(info); |
| 1518 | |
| 1519 | current_async = ports; |
| 1520 | |
| 1521 | while (current_async) { |
| 1522 | if ((current_async->line >= info->line) && |
| 1523 | (current_async->line < (info->line + 8))) |
| 1524 | current_async->irq = new_serial.irq; |
| 1525 | |
| 1526 | current_async = current_async->next_port; |
| 1527 | } |
| 1528 | |
| 1529 | serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); |
| 1530 | if (info->irq == 9) |
| 1531 | serial_out(info, UART_ESI_CMD2, 0x02); |
| 1532 | else |
| 1533 | serial_out(info, UART_ESI_CMD2, info->irq); |
| 1534 | } |
| 1535 | } |
| 1536 | |
| 1537 | if (info->flags & ASYNC_INITIALIZED) { |
| 1538 | if (((old_info.flags & ASYNC_SPD_MASK) != |
| 1539 | (info->flags & ASYNC_SPD_MASK)) || |
| 1540 | (old_info.custom_divisor != info->custom_divisor)) { |
| 1541 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
| 1542 | info->tty->alt_speed = 57600; |
| 1543 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
| 1544 | info->tty->alt_speed = 115200; |
| 1545 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
| 1546 | info->tty->alt_speed = 230400; |
| 1547 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
| 1548 | info->tty->alt_speed = 460800; |
| 1549 | change_speed(info); |
| 1550 | } |
| 1551 | } else |
| 1552 | retval = startup(info); |
| 1553 | |
| 1554 | return retval; |
| 1555 | } |
| 1556 | |
| 1557 | static int set_esp_config(struct esp_struct * info, |
| 1558 | struct hayes_esp_config __user * new_info) |
| 1559 | { |
| 1560 | struct hayes_esp_config new_config; |
| 1561 | unsigned int change_dma; |
| 1562 | int retval = 0; |
| 1563 | struct esp_struct *current_async; |
| 1564 | unsigned long flags; |
| 1565 | |
| 1566 | /* Perhaps a non-sysadmin user should be able to do some of these */ |
| 1567 | /* operations. I haven't decided yet. */ |
| 1568 | |
| 1569 | if (!capable(CAP_SYS_ADMIN)) |
| 1570 | return -EPERM; |
| 1571 | |
| 1572 | if (copy_from_user(&new_config, new_info, sizeof(new_config))) |
| 1573 | return -EFAULT; |
| 1574 | |
| 1575 | if ((new_config.flow_on >= new_config.flow_off) || |
| 1576 | (new_config.rx_trigger < 1) || |
| 1577 | (new_config.tx_trigger < 1) || |
| 1578 | (new_config.flow_off < 1) || |
| 1579 | (new_config.flow_on < 1) || |
| 1580 | (new_config.rx_trigger > 1023) || |
| 1581 | (new_config.tx_trigger > 1023) || |
| 1582 | (new_config.flow_off > 1023) || |
| 1583 | (new_config.flow_on > 1023) || |
| 1584 | (new_config.pio_threshold < 0) || |
| 1585 | (new_config.pio_threshold > 1024)) |
| 1586 | return -EINVAL; |
| 1587 | |
| 1588 | if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3)) |
| 1589 | new_config.dma_channel = 0; |
| 1590 | |
| 1591 | if (info->stat_flags & ESP_STAT_NEVER_DMA) |
| 1592 | change_dma = new_config.dma_channel; |
| 1593 | else |
| 1594 | change_dma = (new_config.dma_channel != dma); |
| 1595 | |
| 1596 | if (change_dma) { |
| 1597 | if (new_config.dma_channel) { |
| 1598 | /* PIO mode to DMA mode transition OR */ |
| 1599 | /* change current DMA channel */ |
| 1600 | |
| 1601 | current_async = ports; |
| 1602 | |
| 1603 | while (current_async) { |
| 1604 | if (current_async == info) { |
| 1605 | if (current_async->count > 1) |
| 1606 | return -EBUSY; |
| 1607 | } else if (current_async->count) |
| 1608 | return -EBUSY; |
| 1609 | |
| 1610 | current_async = |
| 1611 | current_async->next_port; |
| 1612 | } |
| 1613 | |
| 1614 | shutdown(info); |
| 1615 | dma = new_config.dma_channel; |
| 1616 | info->stat_flags &= ~ESP_STAT_NEVER_DMA; |
| 1617 | |
| 1618 | /* all ports must use the same DMA channel */ |
| 1619 | |
| 1620 | spin_lock_irqsave(&info->lock, flags); |
| 1621 | current_async = ports; |
| 1622 | |
| 1623 | while (current_async) { |
| 1624 | esp_basic_init(current_async); |
| 1625 | current_async = current_async->next_port; |
| 1626 | } |
| 1627 | spin_unlock_irqrestore(&info->lock, flags); |
| 1628 | } else { |
| 1629 | /* DMA mode to PIO mode only */ |
| 1630 | |
| 1631 | if (info->count > 1) |
| 1632 | return -EBUSY; |
| 1633 | |
| 1634 | shutdown(info); |
| 1635 | spin_lock_irqsave(&info->lock, flags); |
| 1636 | info->stat_flags |= ESP_STAT_NEVER_DMA; |
| 1637 | esp_basic_init(info); |
| 1638 | spin_unlock_irqrestore(&info->lock, flags); |
| 1639 | } |
| 1640 | } |
| 1641 | |
| 1642 | info->config.pio_threshold = new_config.pio_threshold; |
| 1643 | |
| 1644 | if ((new_config.flow_off != info->config.flow_off) || |
| 1645 | (new_config.flow_on != info->config.flow_on)) { |
| 1646 | unsigned long flags; |
| 1647 | |
| 1648 | info->config.flow_off = new_config.flow_off; |
| 1649 | info->config.flow_on = new_config.flow_on; |
| 1650 | |
| 1651 | spin_lock_irqsave(&info->lock, flags); |
| 1652 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); |
| 1653 | serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8); |
| 1654 | serial_out(info, UART_ESI_CMD2, new_config.flow_off); |
| 1655 | serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8); |
| 1656 | serial_out(info, UART_ESI_CMD2, new_config.flow_on); |
| 1657 | spin_unlock_irqrestore(&info->lock, flags); |
| 1658 | } |
| 1659 | |
| 1660 | if ((new_config.rx_trigger != info->config.rx_trigger) || |
| 1661 | (new_config.tx_trigger != info->config.tx_trigger)) { |
| 1662 | unsigned long flags; |
| 1663 | |
| 1664 | info->config.rx_trigger = new_config.rx_trigger; |
| 1665 | info->config.tx_trigger = new_config.tx_trigger; |
| 1666 | spin_lock_irqsave(&info->lock, flags); |
| 1667 | serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); |
| 1668 | serial_out(info, UART_ESI_CMD2, |
| 1669 | new_config.rx_trigger >> 8); |
| 1670 | serial_out(info, UART_ESI_CMD2, new_config.rx_trigger); |
| 1671 | serial_out(info, UART_ESI_CMD2, |
| 1672 | new_config.tx_trigger >> 8); |
| 1673 | serial_out(info, UART_ESI_CMD2, new_config.tx_trigger); |
| 1674 | spin_unlock_irqrestore(&info->lock, flags); |
| 1675 | } |
| 1676 | |
| 1677 | if (new_config.rx_timeout != info->config.rx_timeout) { |
| 1678 | unsigned long flags; |
| 1679 | |
| 1680 | info->config.rx_timeout = new_config.rx_timeout; |
| 1681 | spin_lock_irqsave(&info->lock, flags); |
| 1682 | |
| 1683 | if (info->IER & UART_IER_RDI) { |
| 1684 | serial_out(info, UART_ESI_CMD1, |
| 1685 | ESI_SET_RX_TIMEOUT); |
| 1686 | serial_out(info, UART_ESI_CMD2, |
| 1687 | new_config.rx_timeout); |
| 1688 | } |
| 1689 | |
| 1690 | spin_unlock_irqrestore(&info->lock, flags); |
| 1691 | } |
| 1692 | |
| 1693 | if (!(info->flags & ASYNC_INITIALIZED)) |
| 1694 | retval = startup(info); |
| 1695 | |
| 1696 | return retval; |
| 1697 | } |
| 1698 | |
| 1699 | /* |
| 1700 | * get_lsr_info - get line status register info |
| 1701 | * |
| 1702 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 1703 | * is emptied. On bus types like RS485, the transmitter must |
| 1704 | * release the bus after transmitting. This must be done when |
| 1705 | * the transmit shift register is empty, not be done when the |
| 1706 | * transmit holding register is empty. This functionality |
| 1707 | * allows an RS485 driver to be written in user space. |
| 1708 | */ |
| 1709 | static int get_lsr_info(struct esp_struct * info, unsigned int __user *value) |
| 1710 | { |
| 1711 | unsigned char status; |
| 1712 | unsigned int result; |
| 1713 | unsigned long flags; |
| 1714 | |
| 1715 | spin_lock_irqsave(&info->lock, flags); |
| 1716 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); |
| 1717 | status = serial_in(info, UART_ESI_STAT1); |
| 1718 | spin_unlock_irqrestore(&info->lock, flags); |
| 1719 | result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0); |
| 1720 | return put_user(result,value); |
| 1721 | } |
| 1722 | |
| 1723 | |
| 1724 | static int esp_tiocmget(struct tty_struct *tty, struct file *file) |
| 1725 | { |
| 1726 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; |
| 1727 | unsigned char control, status; |
| 1728 | unsigned long flags; |
| 1729 | |
| 1730 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) |
| 1731 | return -ENODEV; |
| 1732 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1733 | return -EIO; |
| 1734 | |
| 1735 | control = info->MCR; |
| 1736 | |
| 1737 | spin_lock_irqsave(&info->lock, flags); |
| 1738 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); |
| 1739 | status = serial_in(info, UART_ESI_STAT2); |
| 1740 | spin_unlock_irqrestore(&info->lock, flags); |
| 1741 | |
| 1742 | return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
| 1743 | | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
| 1744 | | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
| 1745 | | ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
| 1746 | | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
| 1747 | | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0); |
| 1748 | } |
| 1749 | |
| 1750 | static int esp_tiocmset(struct tty_struct *tty, struct file *file, |
| 1751 | unsigned int set, unsigned int clear) |
| 1752 | { |
| 1753 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; |
| 1754 | unsigned long flags; |
| 1755 | |
| 1756 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) |
| 1757 | return -ENODEV; |
| 1758 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1759 | return -EIO; |
| 1760 | |
| 1761 | spin_lock_irqsave(&info->lock, flags); |
| 1762 | |
| 1763 | if (set & TIOCM_RTS) |
| 1764 | info->MCR |= UART_MCR_RTS; |
| 1765 | if (set & TIOCM_DTR) |
| 1766 | info->MCR |= UART_MCR_DTR; |
| 1767 | |
| 1768 | if (clear & TIOCM_RTS) |
| 1769 | info->MCR &= ~UART_MCR_RTS; |
| 1770 | if (clear & TIOCM_DTR) |
| 1771 | info->MCR &= ~UART_MCR_DTR; |
| 1772 | |
| 1773 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 1774 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 1775 | serial_out(info, UART_ESI_CMD2, info->MCR); |
| 1776 | |
| 1777 | spin_unlock_irqrestore(&info->lock, flags); |
| 1778 | return 0; |
| 1779 | } |
| 1780 | |
| 1781 | /* |
| 1782 | * rs_break() --- routine which turns the break handling on or off |
| 1783 | */ |
| 1784 | static void esp_break(struct tty_struct *tty, int break_state) |
| 1785 | { |
| 1786 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; |
| 1787 | unsigned long flags; |
| 1788 | |
| 1789 | if (serial_paranoia_check(info, tty->name, "esp_break")) |
| 1790 | return; |
| 1791 | |
| 1792 | if (break_state == -1) { |
| 1793 | spin_lock_irqsave(&info->lock, flags); |
| 1794 | serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); |
| 1795 | serial_out(info, UART_ESI_CMD2, 0x01); |
| 1796 | spin_unlock_irqrestore(&info->lock, flags); |
| 1797 | |
| 1798 | /* FIXME - new style wait needed here */ |
| 1799 | interruptible_sleep_on(&info->break_wait); |
| 1800 | } else { |
| 1801 | spin_lock_irqsave(&info->lock, flags); |
| 1802 | serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); |
| 1803 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 1804 | spin_unlock_irqrestore(&info->lock, flags); |
| 1805 | } |
| 1806 | } |
| 1807 | |
| 1808 | static int rs_ioctl(struct tty_struct *tty, struct file * file, |
| 1809 | unsigned int cmd, unsigned long arg) |
| 1810 | { |
| 1811 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; |
| 1812 | struct async_icount cprev, cnow; /* kernel counter temps */ |
| 1813 | struct serial_icounter_struct __user *p_cuser; /* user space */ |
| 1814 | void __user *argp = (void __user *)arg; |
| 1815 | unsigned long flags; |
| 1816 | |
| 1817 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1818 | return -ENODEV; |
| 1819 | |
| 1820 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 1821 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && |
| 1822 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) && |
| 1823 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) && |
| 1824 | (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) { |
| 1825 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1826 | return -EIO; |
| 1827 | } |
| 1828 | |
| 1829 | switch (cmd) { |
| 1830 | case TIOCGSERIAL: |
| 1831 | return get_serial_info(info, argp); |
| 1832 | case TIOCSSERIAL: |
| 1833 | return set_serial_info(info, argp); |
| 1834 | case TIOCSERCONFIG: |
| 1835 | /* do not reconfigure after initial configuration */ |
| 1836 | return 0; |
| 1837 | |
| 1838 | case TIOCSERGWILD: |
| 1839 | return put_user(0L, (unsigned long __user *)argp); |
| 1840 | |
| 1841 | case TIOCSERGETLSR: /* Get line status register */ |
| 1842 | return get_lsr_info(info, argp); |
| 1843 | |
| 1844 | case TIOCSERSWILD: |
| 1845 | if (!capable(CAP_SYS_ADMIN)) |
| 1846 | return -EPERM; |
| 1847 | return 0; |
| 1848 | |
| 1849 | /* |
| 1850 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 1851 | * - mask passed in arg for lines of interest |
| 1852 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 1853 | * Caller should use TIOCGICOUNT to see which one it was |
| 1854 | */ |
| 1855 | case TIOCMIWAIT: |
| 1856 | spin_lock_irqsave(&info->lock, flags); |
| 1857 | cprev = info->icount; /* note the counters on entry */ |
| 1858 | spin_unlock_irqrestore(&info->lock, flags); |
| 1859 | while (1) { |
| 1860 | /* FIXME: convert to new style wakeup */ |
| 1861 | interruptible_sleep_on(&info->delta_msr_wait); |
| 1862 | /* see if a signal did it */ |
| 1863 | if (signal_pending(current)) |
| 1864 | return -ERESTARTSYS; |
| 1865 | spin_lock_irqsave(&info->lock, flags); |
| 1866 | cnow = info->icount; /* atomic copy */ |
| 1867 | spin_unlock_irqrestore(&info->lock, flags); |
| 1868 | if (cnow.rng == cprev.rng && |
| 1869 | cnow.dsr == cprev.dsr && |
| 1870 | cnow.dcd == cprev.dcd && |
| 1871 | cnow.cts == cprev.cts) |
| 1872 | return -EIO; /* no change => error */ |
| 1873 | if (((arg & TIOCM_RNG) && |
| 1874 | (cnow.rng != cprev.rng)) || |
| 1875 | ((arg & TIOCM_DSR) && |
| 1876 | (cnow.dsr != cprev.dsr)) || |
| 1877 | ((arg & TIOCM_CD) && |
| 1878 | (cnow.dcd != cprev.dcd)) || |
| 1879 | ((arg & TIOCM_CTS) && |
| 1880 | (cnow.cts != cprev.cts)) ) { |
| 1881 | return 0; |
| 1882 | } |
| 1883 | cprev = cnow; |
| 1884 | } |
| 1885 | /* NOTREACHED */ |
| 1886 | |
| 1887 | /* |
| 1888 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1889 | * Return: write counters to the user passed counter struct |
| 1890 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1891 | * RI where only 0->1 is counted. |
| 1892 | */ |
| 1893 | case TIOCGICOUNT: |
| 1894 | spin_lock_irqsave(&info->lock, flags); |
| 1895 | cnow = info->icount; |
| 1896 | spin_unlock_irqrestore(&info->lock, flags); |
| 1897 | p_cuser = argp; |
| 1898 | if (put_user(cnow.cts, &p_cuser->cts) || |
| 1899 | put_user(cnow.dsr, &p_cuser->dsr) || |
| 1900 | put_user(cnow.rng, &p_cuser->rng) || |
| 1901 | put_user(cnow.dcd, &p_cuser->dcd)) |
| 1902 | return -EFAULT; |
| 1903 | |
| 1904 | return 0; |
| 1905 | case TIOCGHAYESESP: |
| 1906 | return get_esp_config(info, argp); |
| 1907 | case TIOCSHAYESESP: |
| 1908 | return set_esp_config(info, argp); |
| 1909 | |
| 1910 | default: |
| 1911 | return -ENOIOCTLCMD; |
| 1912 | } |
| 1913 | return 0; |
| 1914 | } |
| 1915 | |
| 1916 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) |
| 1917 | { |
| 1918 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 1919 | unsigned long flags; |
| 1920 | |
| 1921 | if ( (tty->termios->c_cflag == old_termios->c_cflag) |
| 1922 | && ( RELEVANT_IFLAG(tty->termios->c_iflag) |
| 1923 | == RELEVANT_IFLAG(old_termios->c_iflag))) |
| 1924 | return; |
| 1925 | |
| 1926 | change_speed(info); |
| 1927 | |
| 1928 | spin_lock_irqsave(&info->lock, flags); |
| 1929 | |
| 1930 | /* Handle transition to B0 status */ |
| 1931 | if ((old_termios->c_cflag & CBAUD) && |
| 1932 | !(tty->termios->c_cflag & CBAUD)) { |
| 1933 | info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); |
| 1934 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 1935 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 1936 | serial_out(info, UART_ESI_CMD2, info->MCR); |
| 1937 | } |
| 1938 | |
| 1939 | /* Handle transition away from B0 status */ |
| 1940 | if (!(old_termios->c_cflag & CBAUD) && |
| 1941 | (tty->termios->c_cflag & CBAUD)) { |
| 1942 | info->MCR |= (UART_MCR_DTR | UART_MCR_RTS); |
| 1943 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 1944 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 1945 | serial_out(info, UART_ESI_CMD2, info->MCR); |
| 1946 | } |
| 1947 | |
| 1948 | spin_unlock_irqrestore(&info->lock, flags); |
| 1949 | |
| 1950 | /* Handle turning of CRTSCTS */ |
| 1951 | if ((old_termios->c_cflag & CRTSCTS) && |
| 1952 | !(tty->termios->c_cflag & CRTSCTS)) { |
| 1953 | rs_start(tty); |
| 1954 | } |
| 1955 | } |
| 1956 | |
| 1957 | /* |
| 1958 | * ------------------------------------------------------------ |
| 1959 | * rs_close() |
| 1960 | * |
| 1961 | * This routine is called when the serial port gets closed. First, we |
| 1962 | * wait for the last remaining data to be sent. Then, we unlink its |
| 1963 | * async structure from the interrupt chain if necessary, and we free |
| 1964 | * that IRQ if nothing is left in the chain. |
| 1965 | * ------------------------------------------------------------ |
| 1966 | */ |
| 1967 | static void rs_close(struct tty_struct *tty, struct file * filp) |
| 1968 | { |
| 1969 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; |
| 1970 | unsigned long flags; |
| 1971 | |
| 1972 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) |
| 1973 | return; |
| 1974 | |
| 1975 | spin_lock_irqsave(&info->lock, flags); |
| 1976 | |
| 1977 | if (tty_hung_up_p(filp)) { |
| 1978 | DBG_CNT("before DEC-hung"); |
| 1979 | goto out; |
| 1980 | } |
| 1981 | |
| 1982 | #ifdef SERIAL_DEBUG_OPEN |
| 1983 | printk("rs_close ttys%d, count = %d\n", info->line, info->count); |
| 1984 | #endif |
| 1985 | if ((tty->count == 1) && (info->count != 1)) { |
| 1986 | /* |
| 1987 | * Uh, oh. tty->count is 1, which means that the tty |
| 1988 | * structure will be freed. Info->count should always |
| 1989 | * be one in these conditions. If it's greater than |
| 1990 | * one, we've got real problems, since it means the |
| 1991 | * serial port won't be shutdown. |
| 1992 | */ |
| 1993 | printk("rs_close: bad serial port count; tty->count is 1, " |
| 1994 | "info->count is %d\n", info->count); |
| 1995 | info->count = 1; |
| 1996 | } |
| 1997 | if (--info->count < 0) { |
| 1998 | printk("rs_close: bad serial port count for ttys%d: %d\n", |
| 1999 | info->line, info->count); |
| 2000 | info->count = 0; |
| 2001 | } |
| 2002 | if (info->count) { |
| 2003 | DBG_CNT("before DEC-2"); |
| 2004 | goto out; |
| 2005 | } |
| 2006 | info->flags |= ASYNC_CLOSING; |
| 2007 | |
| 2008 | spin_unlock_irqrestore(&info->lock, flags); |
| 2009 | /* |
| 2010 | * Now we wait for the transmit buffer to clear; and we notify |
| 2011 | * the line discipline to only process XON/XOFF characters. |
| 2012 | */ |
| 2013 | tty->closing = 1; |
| 2014 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 2015 | tty_wait_until_sent(tty, info->closing_wait); |
| 2016 | /* |
| 2017 | * At this point we stop accepting input. To do this, we |
| 2018 | * disable the receive line status interrupts, and tell the |
| 2019 | * interrupt driver to stop checking the data ready bit in the |
| 2020 | * line status register. |
| 2021 | */ |
| 2022 | /* info->IER &= ~UART_IER_RLSI; */ |
| 2023 | info->IER &= ~UART_IER_RDI; |
| 2024 | info->read_status_mask &= ~UART_LSR_DR; |
| 2025 | if (info->flags & ASYNC_INITIALIZED) { |
| 2026 | |
| 2027 | spin_lock_irqsave(&info->lock, flags); |
| 2028 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); |
| 2029 | serial_out(info, UART_ESI_CMD2, info->IER); |
| 2030 | |
| 2031 | /* disable receive timeout */ |
| 2032 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); |
| 2033 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 2034 | |
| 2035 | spin_unlock_irqrestore(&info->lock, flags); |
| 2036 | |
| 2037 | /* |
| 2038 | * Before we drop DTR, make sure the UART transmitter |
| 2039 | * has completely drained; this is especially |
| 2040 | * important if there is a transmit FIFO! |
| 2041 | */ |
| 2042 | rs_wait_until_sent(tty, info->timeout); |
| 2043 | } |
| 2044 | shutdown(info); |
| 2045 | if (tty->driver->flush_buffer) |
| 2046 | tty->driver->flush_buffer(tty); |
| 2047 | tty_ldisc_flush(tty); |
| 2048 | tty->closing = 0; |
| 2049 | info->event = 0; |
| 2050 | info->tty = NULL; |
| 2051 | |
| 2052 | if (info->blocked_open) { |
| 2053 | if (info->close_delay) { |
| 2054 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); |
| 2055 | } |
| 2056 | wake_up_interruptible(&info->open_wait); |
| 2057 | } |
| 2058 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
| 2059 | wake_up_interruptible(&info->close_wait); |
| 2060 | return; |
| 2061 | |
| 2062 | out: |
| 2063 | spin_unlock_irqrestore(&info->lock, flags); |
| 2064 | } |
| 2065 | |
| 2066 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) |
| 2067 | { |
| 2068 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; |
| 2069 | unsigned long orig_jiffies, char_time; |
| 2070 | unsigned long flags; |
| 2071 | |
| 2072 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) |
| 2073 | return; |
| 2074 | |
| 2075 | orig_jiffies = jiffies; |
| 2076 | char_time = ((info->timeout - HZ / 50) / 1024) / 5; |
| 2077 | |
| 2078 | if (!char_time) |
| 2079 | char_time = 1; |
| 2080 | |
| 2081 | spin_lock_irqsave(&info->lock, flags); |
| 2082 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); |
| 2083 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); |
| 2084 | |
| 2085 | while ((serial_in(info, UART_ESI_STAT1) != 0x03) || |
| 2086 | (serial_in(info, UART_ESI_STAT2) != 0xff)) { |
| 2087 | |
| 2088 | spin_unlock_irqrestore(&info->lock, flags); |
| 2089 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 2090 | |
| 2091 | if (signal_pending(current)) |
| 2092 | break; |
| 2093 | |
| 2094 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 2095 | break; |
| 2096 | |
| 2097 | spin_lock_irqsave(&info->lock, flags); |
| 2098 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); |
| 2099 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); |
| 2100 | } |
| 2101 | spin_unlock_irqrestore(&info->lock, flags); |
| 2102 | set_current_state(TASK_RUNNING); |
| 2103 | } |
| 2104 | |
| 2105 | /* |
| 2106 | * esp_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 2107 | */ |
| 2108 | static void esp_hangup(struct tty_struct *tty) |
| 2109 | { |
| 2110 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; |
| 2111 | |
| 2112 | if (serial_paranoia_check(info, tty->name, "esp_hangup")) |
| 2113 | return; |
| 2114 | |
| 2115 | rs_flush_buffer(tty); |
| 2116 | shutdown(info); |
| 2117 | info->event = 0; |
| 2118 | info->count = 0; |
| 2119 | info->flags &= ~ASYNC_NORMAL_ACTIVE; |
| 2120 | info->tty = NULL; |
| 2121 | wake_up_interruptible(&info->open_wait); |
| 2122 | } |
| 2123 | |
| 2124 | /* |
| 2125 | * ------------------------------------------------------------ |
| 2126 | * esp_open() and friends |
| 2127 | * ------------------------------------------------------------ |
| 2128 | */ |
| 2129 | static int block_til_ready(struct tty_struct *tty, struct file * filp, |
| 2130 | struct esp_struct *info) |
| 2131 | { |
| 2132 | DECLARE_WAITQUEUE(wait, current); |
| 2133 | int retval; |
| 2134 | int do_clocal = 0; |
| 2135 | unsigned long flags; |
| 2136 | |
| 2137 | /* |
| 2138 | * If the device is in the middle of being closed, then block |
| 2139 | * until it's done, and then try again. |
| 2140 | */ |
| 2141 | if (tty_hung_up_p(filp) || |
| 2142 | (info->flags & ASYNC_CLOSING)) { |
| 2143 | if (info->flags & ASYNC_CLOSING) |
| 2144 | interruptible_sleep_on(&info->close_wait); |
| 2145 | #ifdef SERIAL_DO_RESTART |
| 2146 | if (info->flags & ASYNC_HUP_NOTIFY) |
| 2147 | return -EAGAIN; |
| 2148 | else |
| 2149 | return -ERESTARTSYS; |
| 2150 | #else |
| 2151 | return -EAGAIN; |
| 2152 | #endif |
| 2153 | } |
| 2154 | |
| 2155 | /* |
| 2156 | * If non-blocking mode is set, or the port is not enabled, |
| 2157 | * then make the check up front and then exit. |
| 2158 | */ |
| 2159 | if ((filp->f_flags & O_NONBLOCK) || |
| 2160 | (tty->flags & (1 << TTY_IO_ERROR))) { |
| 2161 | info->flags |= ASYNC_NORMAL_ACTIVE; |
| 2162 | return 0; |
| 2163 | } |
| 2164 | |
| 2165 | if (tty->termios->c_cflag & CLOCAL) |
| 2166 | do_clocal = 1; |
| 2167 | |
| 2168 | /* |
| 2169 | * Block waiting for the carrier detect and the line to become |
| 2170 | * free (i.e., not in use by the callout). While we are in |
| 2171 | * this loop, info->count is dropped by one, so that |
| 2172 | * rs_close() knows when to free things. We restore it upon |
| 2173 | * exit, either normal or abnormal. |
| 2174 | */ |
| 2175 | retval = 0; |
| 2176 | add_wait_queue(&info->open_wait, &wait); |
| 2177 | #ifdef SERIAL_DEBUG_OPEN |
| 2178 | printk("block_til_ready before block: ttys%d, count = %d\n", |
| 2179 | info->line, info->count); |
| 2180 | #endif |
| 2181 | spin_lock_irqsave(&info->lock, flags); |
| 2182 | if (!tty_hung_up_p(filp)) |
| 2183 | info->count--; |
| 2184 | info->blocked_open++; |
| 2185 | while (1) { |
| 2186 | if ((tty->termios->c_cflag & CBAUD)) { |
| 2187 | unsigned int scratch; |
| 2188 | |
| 2189 | serial_out(info, UART_ESI_CMD1, ESI_READ_UART); |
| 2190 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 2191 | scratch = serial_in(info, UART_ESI_STAT1); |
| 2192 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 2193 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 2194 | serial_out(info, UART_ESI_CMD2, |
| 2195 | scratch | UART_MCR_DTR | UART_MCR_RTS); |
| 2196 | } |
| 2197 | set_current_state(TASK_INTERRUPTIBLE); |
| 2198 | if (tty_hung_up_p(filp) || |
| 2199 | !(info->flags & ASYNC_INITIALIZED)) { |
| 2200 | #ifdef SERIAL_DO_RESTART |
| 2201 | if (info->flags & ASYNC_HUP_NOTIFY) |
| 2202 | retval = -EAGAIN; |
| 2203 | else |
| 2204 | retval = -ERESTARTSYS; |
| 2205 | #else |
| 2206 | retval = -EAGAIN; |
| 2207 | #endif |
| 2208 | break; |
| 2209 | } |
| 2210 | |
| 2211 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); |
| 2212 | if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD) |
| 2213 | do_clocal = 1; |
| 2214 | |
| 2215 | if (!(info->flags & ASYNC_CLOSING) && |
| 2216 | (do_clocal)) |
| 2217 | break; |
| 2218 | if (signal_pending(current)) { |
| 2219 | retval = -ERESTARTSYS; |
| 2220 | break; |
| 2221 | } |
| 2222 | #ifdef SERIAL_DEBUG_OPEN |
| 2223 | printk("block_til_ready blocking: ttys%d, count = %d\n", |
| 2224 | info->line, info->count); |
| 2225 | #endif |
| 2226 | spin_unlock_irqrestore(&info->lock, flags); |
| 2227 | schedule(); |
| 2228 | spin_lock_irqsave(&info->lock, flags); |
| 2229 | } |
| 2230 | set_current_state(TASK_RUNNING); |
| 2231 | remove_wait_queue(&info->open_wait, &wait); |
| 2232 | if (!tty_hung_up_p(filp)) |
| 2233 | info->count++; |
| 2234 | info->blocked_open--; |
| 2235 | spin_unlock_irqrestore(&info->lock, flags); |
| 2236 | #ifdef SERIAL_DEBUG_OPEN |
| 2237 | printk("block_til_ready after blocking: ttys%d, count = %d\n", |
| 2238 | info->line, info->count); |
| 2239 | #endif |
| 2240 | if (retval) |
| 2241 | return retval; |
| 2242 | info->flags |= ASYNC_NORMAL_ACTIVE; |
| 2243 | return 0; |
| 2244 | } |
| 2245 | |
| 2246 | /* |
| 2247 | * This routine is called whenever a serial port is opened. It |
| 2248 | * enables interrupts for a serial port, linking in its async structure into |
| 2249 | * the IRQ chain. It also performs the serial-specific |
| 2250 | * initialization for the tty structure. |
| 2251 | */ |
| 2252 | static int esp_open(struct tty_struct *tty, struct file * filp) |
| 2253 | { |
| 2254 | struct esp_struct *info; |
| 2255 | int retval, line; |
| 2256 | unsigned long flags; |
| 2257 | |
| 2258 | line = tty->index; |
| 2259 | if ((line < 0) || (line >= NR_PORTS)) |
| 2260 | return -ENODEV; |
| 2261 | |
| 2262 | /* find the port in the chain */ |
| 2263 | |
| 2264 | info = ports; |
| 2265 | |
| 2266 | while (info && (info->line != line)) |
| 2267 | info = info->next_port; |
| 2268 | |
| 2269 | if (!info) { |
| 2270 | serial_paranoia_check(info, tty->name, "esp_open"); |
| 2271 | return -ENODEV; |
| 2272 | } |
| 2273 | |
| 2274 | #ifdef SERIAL_DEBUG_OPEN |
| 2275 | printk("esp_open %s, count = %d\n", tty->name, info->count); |
| 2276 | #endif |
| 2277 | spin_lock_irqsave(&info->lock, flags); |
| 2278 | info->count++; |
| 2279 | tty->driver_data = info; |
| 2280 | info->tty = tty; |
| 2281 | |
Alan Cox | 5552c28 | 2006-02-14 17:50:54 +0000 | [diff] [blame] | 2282 | spin_unlock_irqrestore(&info->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | |
| 2284 | /* |
| 2285 | * Start up serial port |
| 2286 | */ |
| 2287 | retval = startup(info); |
| 2288 | if (retval) |
| 2289 | return retval; |
| 2290 | |
| 2291 | retval = block_til_ready(tty, filp, info); |
| 2292 | if (retval) { |
| 2293 | #ifdef SERIAL_DEBUG_OPEN |
| 2294 | printk("esp_open returning after block_til_ready with %d\n", |
| 2295 | retval); |
| 2296 | #endif |
| 2297 | return retval; |
| 2298 | } |
| 2299 | |
| 2300 | #ifdef SERIAL_DEBUG_OPEN |
| 2301 | printk("esp_open %s successful...", tty->name); |
| 2302 | #endif |
| 2303 | return 0; |
| 2304 | } |
| 2305 | |
| 2306 | /* |
| 2307 | * --------------------------------------------------------------------- |
| 2308 | * espserial_init() and friends |
| 2309 | * |
| 2310 | * espserial_init() is called at boot-time to initialize the serial driver. |
| 2311 | * --------------------------------------------------------------------- |
| 2312 | */ |
| 2313 | |
| 2314 | /* |
| 2315 | * This routine prints out the appropriate serial driver version |
| 2316 | * number, and identifies which options were configured into this |
| 2317 | * driver. |
| 2318 | */ |
| 2319 | |
| 2320 | static inline void show_serial_version(void) |
| 2321 | { |
| 2322 | printk(KERN_INFO "%s version %s (DMA %u)\n", |
| 2323 | serial_name, serial_version, dma); |
| 2324 | } |
| 2325 | |
| 2326 | /* |
| 2327 | * This routine is called by espserial_init() to initialize a specific serial |
| 2328 | * port. |
| 2329 | */ |
| 2330 | static inline int autoconfig(struct esp_struct * info) |
| 2331 | { |
| 2332 | int port_detected = 0; |
| 2333 | unsigned long flags; |
| 2334 | |
| 2335 | if (!request_region(info->port, REGION_SIZE, "esp serial")) |
| 2336 | return -EIO; |
| 2337 | |
| 2338 | spin_lock_irqsave(&info->lock, flags); |
| 2339 | /* |
| 2340 | * Check for ESP card |
| 2341 | */ |
| 2342 | |
| 2343 | if (serial_in(info, UART_ESI_BASE) == 0xf3) { |
| 2344 | serial_out(info, UART_ESI_CMD1, 0x00); |
| 2345 | serial_out(info, UART_ESI_CMD1, 0x01); |
| 2346 | |
| 2347 | if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) { |
| 2348 | port_detected = 1; |
| 2349 | |
| 2350 | if (!(info->irq)) { |
| 2351 | serial_out(info, UART_ESI_CMD1, 0x02); |
| 2352 | |
| 2353 | if (serial_in(info, UART_ESI_STAT1) & 0x01) |
| 2354 | info->irq = 3; |
| 2355 | else |
| 2356 | info->irq = 4; |
| 2357 | } |
| 2358 | |
| 2359 | |
| 2360 | /* put card in enhanced mode */ |
| 2361 | /* this prevents access through */ |
| 2362 | /* the "old" IO ports */ |
| 2363 | esp_basic_init(info); |
| 2364 | |
| 2365 | /* clear out MCR */ |
| 2366 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); |
| 2367 | serial_out(info, UART_ESI_CMD2, UART_MCR); |
| 2368 | serial_out(info, UART_ESI_CMD2, 0x00); |
| 2369 | } |
| 2370 | } |
| 2371 | if (!port_detected) |
| 2372 | release_region(info->port, REGION_SIZE); |
| 2373 | |
| 2374 | spin_unlock_irqrestore(&info->lock, flags); |
| 2375 | return (port_detected); |
| 2376 | } |
| 2377 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 2378 | static const struct tty_operations esp_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | .open = esp_open, |
| 2380 | .close = rs_close, |
| 2381 | .write = rs_write, |
| 2382 | .put_char = rs_put_char, |
| 2383 | .flush_chars = rs_flush_chars, |
| 2384 | .write_room = rs_write_room, |
| 2385 | .chars_in_buffer = rs_chars_in_buffer, |
| 2386 | .flush_buffer = rs_flush_buffer, |
| 2387 | .ioctl = rs_ioctl, |
| 2388 | .throttle = rs_throttle, |
| 2389 | .unthrottle = rs_unthrottle, |
| 2390 | .set_termios = rs_set_termios, |
| 2391 | .stop = rs_stop, |
| 2392 | .start = rs_start, |
| 2393 | .hangup = esp_hangup, |
| 2394 | .break_ctl = esp_break, |
| 2395 | .wait_until_sent = rs_wait_until_sent, |
| 2396 | .tiocmget = esp_tiocmget, |
| 2397 | .tiocmset = esp_tiocmset, |
| 2398 | }; |
| 2399 | |
| 2400 | /* |
| 2401 | * The serial driver boot-time initialization code! |
| 2402 | */ |
| 2403 | static int __init espserial_init(void) |
| 2404 | { |
| 2405 | int i, offset; |
| 2406 | struct esp_struct * info; |
| 2407 | struct esp_struct *last_primary = NULL; |
| 2408 | int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380}; |
| 2409 | |
| 2410 | esp_driver = alloc_tty_driver(NR_PORTS); |
| 2411 | if (!esp_driver) |
| 2412 | return -ENOMEM; |
| 2413 | |
| 2414 | for (i = 0; i < NR_PRIMARY; i++) { |
| 2415 | if (irq[i] != 0) { |
| 2416 | if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) || |
| 2417 | (irq[i] == 8) || (irq[i] == 13)) |
| 2418 | irq[i] = 0; |
| 2419 | else if (irq[i] == 2) |
| 2420 | irq[i] = 9; |
| 2421 | } |
| 2422 | } |
| 2423 | |
| 2424 | if ((dma != 1) && (dma != 3)) |
| 2425 | dma = 0; |
| 2426 | |
| 2427 | if ((rx_trigger < 1) || (rx_trigger > 1023)) |
| 2428 | rx_trigger = 768; |
| 2429 | |
| 2430 | if ((tx_trigger < 1) || (tx_trigger > 1023)) |
| 2431 | tx_trigger = 768; |
| 2432 | |
| 2433 | if ((flow_off < 1) || (flow_off > 1023)) |
| 2434 | flow_off = 1016; |
| 2435 | |
| 2436 | if ((flow_on < 1) || (flow_on > 1023)) |
| 2437 | flow_on = 944; |
| 2438 | |
| 2439 | if ((rx_timeout < 0) || (rx_timeout > 255)) |
| 2440 | rx_timeout = 128; |
| 2441 | |
| 2442 | if (flow_on >= flow_off) |
| 2443 | flow_on = flow_off - 1; |
| 2444 | |
| 2445 | show_serial_version(); |
| 2446 | |
| 2447 | /* Initialize the tty_driver structure */ |
| 2448 | |
| 2449 | esp_driver->owner = THIS_MODULE; |
| 2450 | esp_driver->name = "ttyP"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | esp_driver->major = ESP_IN_MAJOR; |
| 2452 | esp_driver->minor_start = 0; |
| 2453 | esp_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 2454 | esp_driver->subtype = SERIAL_TYPE_NORMAL; |
| 2455 | esp_driver->init_termios = tty_std_termios; |
| 2456 | esp_driver->init_termios.c_cflag = |
| 2457 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 2458 | esp_driver->flags = TTY_DRIVER_REAL_RAW; |
| 2459 | tty_set_operations(esp_driver, &esp_ops); |
| 2460 | if (tty_register_driver(esp_driver)) |
| 2461 | { |
| 2462 | printk(KERN_ERR "Couldn't register esp serial driver"); |
| 2463 | put_tty_driver(esp_driver); |
| 2464 | return 1; |
| 2465 | } |
| 2466 | |
| 2467 | info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL); |
| 2468 | |
| 2469 | if (!info) |
| 2470 | { |
| 2471 | printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); |
| 2472 | tty_unregister_driver(esp_driver); |
| 2473 | put_tty_driver(esp_driver); |
| 2474 | return 1; |
| 2475 | } |
| 2476 | |
| 2477 | memset((void *)info, 0, sizeof(struct esp_struct)); |
Ingo Molnar | 8f56a31 | 2006-01-16 22:14:00 -0800 | [diff] [blame] | 2478 | spin_lock_init(&info->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2479 | /* rx_trigger, tx_trigger are needed by autoconfig */ |
| 2480 | info->config.rx_trigger = rx_trigger; |
| 2481 | info->config.tx_trigger = tx_trigger; |
| 2482 | |
| 2483 | i = 0; |
| 2484 | offset = 0; |
| 2485 | |
| 2486 | do { |
| 2487 | info->port = esp[i] + offset; |
| 2488 | info->irq = irq[i]; |
| 2489 | info->line = (i * 8) + (offset / 8); |
| 2490 | |
| 2491 | if (!autoconfig(info)) { |
| 2492 | i++; |
| 2493 | offset = 0; |
| 2494 | continue; |
| 2495 | } |
| 2496 | |
| 2497 | info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf; |
| 2498 | info->flags = STD_COM_FLAGS; |
| 2499 | if (info->custom_divisor) |
| 2500 | info->flags |= ASYNC_SPD_CUST; |
| 2501 | info->magic = ESP_MAGIC; |
| 2502 | info->close_delay = 5*HZ/10; |
| 2503 | info->closing_wait = 30*HZ; |
| 2504 | INIT_WORK(&info->tqueue, do_softint, info); |
| 2505 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); |
| 2506 | info->config.rx_timeout = rx_timeout; |
| 2507 | info->config.flow_on = flow_on; |
| 2508 | info->config.flow_off = flow_off; |
| 2509 | info->config.pio_threshold = pio_threshold; |
| 2510 | info->next_port = ports; |
| 2511 | init_waitqueue_head(&info->open_wait); |
| 2512 | init_waitqueue_head(&info->close_wait); |
| 2513 | init_waitqueue_head(&info->delta_msr_wait); |
| 2514 | init_waitqueue_head(&info->break_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | ports = info; |
| 2516 | printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ", |
| 2517 | info->line, info->port, info->irq); |
| 2518 | |
| 2519 | if (info->line % 8) { |
| 2520 | printk("secondary port\n"); |
| 2521 | /* 8 port cards can't do DMA */ |
| 2522 | info->stat_flags |= ESP_STAT_NEVER_DMA; |
| 2523 | |
| 2524 | if (last_primary) |
| 2525 | last_primary->stat_flags |= ESP_STAT_NEVER_DMA; |
| 2526 | } else { |
| 2527 | printk("primary port\n"); |
| 2528 | last_primary = info; |
| 2529 | irq[i] = info->irq; |
| 2530 | } |
| 2531 | |
| 2532 | if (!dma) |
| 2533 | info->stat_flags |= ESP_STAT_NEVER_DMA; |
| 2534 | |
| 2535 | info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL); |
| 2536 | if (!info) |
| 2537 | { |
| 2538 | printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); |
| 2539 | |
| 2540 | /* allow use of the already detected ports */ |
| 2541 | return 0; |
| 2542 | } |
| 2543 | |
| 2544 | memset((void *)info, 0, sizeof(struct esp_struct)); |
| 2545 | /* rx_trigger, tx_trigger are needed by autoconfig */ |
| 2546 | info->config.rx_trigger = rx_trigger; |
| 2547 | info->config.tx_trigger = tx_trigger; |
| 2548 | |
| 2549 | if (offset == 56) { |
| 2550 | i++; |
| 2551 | offset = 0; |
| 2552 | } else { |
| 2553 | offset += 8; |
| 2554 | } |
| 2555 | } while (i < NR_PRIMARY); |
| 2556 | |
| 2557 | /* free the last port memory allocation */ |
| 2558 | kfree(info); |
| 2559 | |
| 2560 | return 0; |
| 2561 | } |
| 2562 | |
| 2563 | static void __exit espserial_exit(void) |
| 2564 | { |
| 2565 | int e1; |
| 2566 | struct esp_struct *temp_async; |
| 2567 | struct esp_pio_buffer *pio_buf; |
| 2568 | |
| 2569 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ |
| 2570 | if ((e1 = tty_unregister_driver(esp_driver))) |
| 2571 | printk("SERIAL: failed to unregister serial driver (%d)\n", |
| 2572 | e1); |
| 2573 | put_tty_driver(esp_driver); |
| 2574 | |
| 2575 | while (ports) { |
| 2576 | if (ports->port) { |
| 2577 | release_region(ports->port, REGION_SIZE); |
| 2578 | } |
| 2579 | temp_async = ports->next_port; |
| 2580 | kfree(ports); |
| 2581 | ports = temp_async; |
| 2582 | } |
| 2583 | |
| 2584 | if (dma_buffer) |
| 2585 | free_pages((unsigned long)dma_buffer, |
| 2586 | get_order(DMA_BUFFER_SZ)); |
| 2587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | while (free_pio_buf) { |
| 2589 | pio_buf = free_pio_buf->next; |
| 2590 | kfree(free_pio_buf); |
| 2591 | free_pio_buf = pio_buf; |
| 2592 | } |
| 2593 | } |
| 2594 | |
| 2595 | module_init(espserial_init); |
| 2596 | module_exit(espserial_exit); |