drivers/char/esp.c

   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 #define _INLINE_ inline
 133
 134 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
 135 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
 136  tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
 137 #else
 138 #define DBG_CNT(s)
 139 #endif
 140
 141 static struct esp_struct *ports;
 142
 143 static void change_speed(struct esp_struct *info);
 144 static void rs_wait_until_sent(struct tty_struct *, int);
 145
 146 /*
 147  * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
 148  * times the normal 1.8432 Mhz clock of most serial boards).
 149  */
 150 #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
 151
 152 /* Standard COM flags (except for COM4, because of the 8514 problem) */
 153 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
 154
 155 /*
 156  * tmp_buf is used as a temporary buffer by serial_write.  We need to
 157  * lock it in case the memcpy_fromfs blocks while swapping in a page,
 158  * and some other program tries to do a serial write at the same time.
 159  * Since the lock will only come under contention when the system is
 160  * swapping and available memory is low, it makes sense to share one
 161  * buffer across all the serial ports, since it significantly saves
 162  * memory if large numbers of serial ports are open.
 163  */
 164 static unsigned char *tmp_buf;
 165 static DECLARE_MUTEX(tmp_buf_sem);
 166
 167 static inline int serial_paranoia_check(struct esp_struct *info,
 168                                         char *name, const char *routine)
 169 {
 170 #ifdef SERIAL_PARANOIA_CHECK
 171         static const char badmagic[] = KERN_WARNING
 172                 "Warning: bad magic number for serial struct (%s) in %s\n";
 173         static const char badinfo[] = KERN_WARNING
 174                 "Warning: null esp_struct for (%s) in %s\n";
 175
 176         if (!info) {
 177                 printk(badinfo, name, routine);
 178                 return 1;
 179         }
 180         if (info->magic != ESP_MAGIC) {
 181                 printk(badmagic, name, routine);
 182                 return 1;
 183         }
 184 #endif
 185         return 0;
 186 }
 187
 188 static inline unsigned int serial_in(struct esp_struct *info, int offset)
 189 {
 190         return inb(info->port + offset);
 191 }
 192
 193 static inline void serial_out(struct esp_struct *info, int offset,
 194                               unsigned char value)
 195 {
 196         outb(value, info->port+offset);
 197 }
 198
 199 /*
 200  * ------------------------------------------------------------
 201  * rs_stop() and rs_start()
 202  *
 203  * This routines are called before setting or resetting tty->stopped.
 204  * They enable or disable transmitter interrupts, as necessary.
 205  * ------------------------------------------------------------
 206  */
 207 static void rs_stop(struct tty_struct *tty)
 208 {
 209         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
 210         unsigned long flags;
 211
 212         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 213                 return;
 214
 215         save_flags(flags); cli();
 216         if (info->IER & UART_IER_THRI) {
 217                 info->IER &= ~UART_IER_THRI;
 218                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
 219                 serial_out(info, UART_ESI_CMD2, info->IER);
 220         }
 221
 222         restore_flags(flags);
 223 }
 224
 225 static void rs_start(struct tty_struct *tty)
 226 {
 227         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
 228         unsigned long flags;
 229
 230         if (serial_paranoia_check(info, tty->name, "rs_start"))
 231                 return;
 232
 233         save_flags(flags); cli();
 234         if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
 235                 info->IER |= UART_IER_THRI;
 236                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
 237                 serial_out(info, UART_ESI_CMD2, info->IER);
 238         }
 239         restore_flags(flags);
 240 }
 241
 242 /*
 243  * ----------------------------------------------------------------------
 244  *
 245  * Here starts the interrupt handling routines.  All of the following
 246  * subroutines are declared as inline and are folded into
 247  * rs_interrupt().  They were separated out for readability's sake.
 248  *
 249  * Note: rs_interrupt() is a "fast" interrupt, which means that it
 250  * runs with interrupts turned off.  People who may want to modify
 251  * rs_interrupt() should try to keep the interrupt handler as fast as
 252  * possible.  After you are done making modifications, it is not a bad
 253  * idea to do:
 254  *
 255  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 256  *
 257  * and look at the resulting assemble code in serial.s.
 258  *
 259  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 260  * -----------------------------------------------------------------------
 261  */
 262
 263 /*
 264  * This routine is used by the interrupt handler to schedule
 265  * processing in the software interrupt portion of the driver.
 266  */
 267 static _INLINE_ void rs_sched_event(struct esp_struct *info,
 268                                   int event)
 269 {
 270         info->event |= 1 << event;
 271         schedule_work(&info->tqueue);
 272 }
 273
 274 static _INLINE_ struct esp_pio_buffer *get_pio_buffer(void)
 275 {
 276         struct esp_pio_buffer *buf;
 277
 278         if (free_pio_buf) {
 279                 buf = free_pio_buf;
 280                 free_pio_buf = buf->next;
 281         } else {
 282                 buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
 283         }
 284
 285         return buf;
 286 }
 287
 288 static _INLINE_ void release_pio_buffer(struct esp_pio_buffer *buf)
 289 {
 290         buf->next = free_pio_buf;
 291         free_pio_buf = buf;
 292 }
 293
 294 static _INLINE_ void receive_chars_pio(struct esp_struct *info, int num_bytes)
 295 {
 296         struct tty_struct *tty = info->tty;
 297         int i;
 298         struct esp_pio_buffer *pio_buf;
 299         struct esp_pio_buffer *err_buf;
 300         unsigned char status_mask;
 301
 302         pio_buf = get_pio_buffer();
 303
 304         if (!pio_buf)
 305                 return;
 306
 307         err_buf = get_pio_buffer();
 308
 309         if (!err_buf) {
 310                 release_pio_buffer(pio_buf);
 311                 return;
 312         }
 313
 314         sti();
 315
 316         status_mask = (info->read_status_mask >> 2) & 0x07;
 317
 318         for (i = 0; i < num_bytes - 1; i += 2) {
 319                 *((unsigned short *)(pio_buf->data + i)) =
 320                         inw(info->port + UART_ESI_RX);
 321                 err_buf->data[i] = serial_in(info, UART_ESI_RWS);
 322                 err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
 323                 err_buf->data[i] &= status_mask;
 324         }
 325
 326         if (num_bytes & 0x0001) {
 327                 pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
 328                 err_buf->data[num_bytes - 1] =
 329                         (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
 330         }
 331
 332         cli();
 333
 334         /* make sure everything is still ok since interrupts were enabled */
 335         tty = info->tty;
 336
 337         if (!tty) {
 338                 release_pio_buffer(pio_buf);
 339                 release_pio_buffer(err_buf);
 340                 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
 341                 return;
 342         }
 343
 344         status_mask = (info->ignore_status_mask >> 2) & 0x07;
 345
 346         for (i = 0; i < num_bytes; i++) {
 347                 if (!(err_buf->data[i] & status_mask)) {
 348                         *(tty->flip.char_buf_ptr++) = pio_buf->data[i];
 349
 350                         if (err_buf->data[i] & 0x04) {
 351                                 *(tty->flip.flag_buf_ptr++) = TTY_BREAK;
 352
 353                                 if (info->flags & ASYNC_SAK)
 354                                         do_SAK(tty);
 355                         }
 356                         else if (err_buf->data[i] & 0x02)
 357                                 *(tty->flip.flag_buf_ptr++) = TTY_FRAME;
 358                         else if (err_buf->data[i] & 0x01)
 359                                 *(tty->flip.flag_buf_ptr++) = TTY_PARITY;
 360                         else
 361                                 *(tty->flip.flag_buf_ptr++) = 0;
 362
 363                         tty->flip.count++;
 364                 }
 365         }
 366
 367         schedule_delayed_work(&tty->flip.work, 1);
 368
 369         info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
 370         release_pio_buffer(pio_buf);
 371         release_pio_buffer(err_buf);
 372 }
 373
 374 static _INLINE_ void receive_chars_dma(struct esp_struct *info, int num_bytes)
 375 {
 376         unsigned long flags;
 377         info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
 378         dma_bytes = num_bytes;
 379         info->stat_flags |= ESP_STAT_DMA_RX;
 380
 381         flags=claim_dma_lock();
 382         disable_dma(dma);
 383         clear_dma_ff(dma);
 384         set_dma_mode(dma, DMA_MODE_READ);
 385         set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
 386         set_dma_count(dma, dma_bytes);
 387         enable_dma(dma);
 388         release_dma_lock(flags);
 389
 390         serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
 391 }
 392
 393 static _INLINE_ void receive_chars_dma_done(struct esp_struct *info,
 394                                             int status)
 395 {
 396         struct tty_struct *tty = info->tty;
 397         int num_bytes;
 398         unsigned long flags;
 399
 400
 401         flags=claim_dma_lock();
 402         disable_dma(dma);
 403         clear_dma_ff(dma);
 404
 405         info->stat_flags &= ~ESP_STAT_DMA_RX;
 406         num_bytes = dma_bytes - get_dma_residue(dma);
 407         release_dma_lock(flags);
 408
 409         info->icount.rx += num_bytes;
 410
 411         memcpy(tty->flip.char_buf_ptr, dma_buffer, num_bytes);
 412         tty->flip.char_buf_ptr += num_bytes;
 413         tty->flip.count += num_bytes;
 414         memset(tty->flip.flag_buf_ptr, 0, num_bytes);
 415         tty->flip.flag_buf_ptr += num_bytes;
 416
 417         if (num_bytes > 0) {
 418                 tty->flip.flag_buf_ptr--;
 419
 420                 status &= (0x1c & info->read_status_mask);
 421
 422                 if (status & info->ignore_status_mask) {
 423                         tty->flip.count--;
 424                         tty->flip.char_buf_ptr--;
 425                         tty->flip.flag_buf_ptr--;
 426                 } else if (status & 0x10) {
 427                         *tty->flip.flag_buf_ptr = TTY_BREAK;
 428                         (info->icount.brk)++;
 429                         if (info->flags & ASYNC_SAK)
 430                                 do_SAK(tty);
 431                 } else if (status & 0x08) {
 432                         *tty->flip.flag_buf_ptr = TTY_FRAME;
 433                         (info->icount.frame)++;
 434                 }
 435                 else if (status & 0x04) {
 436                         *tty->flip.flag_buf_ptr = TTY_PARITY;
 437                         (info->icount.parity)++;
 438                 }
 439
 440                 tty->flip.flag_buf_ptr++;
 441
 442                 schedule_delayed_work(&tty->flip.work, 1);
 443         }
 444
 445         if (dma_bytes != num_bytes) {
 446                 num_bytes = dma_bytes - num_bytes;
 447                 dma_bytes = 0;
 448                 receive_chars_dma(info, num_bytes);
 449         } else
 450                 dma_bytes = 0;
 451 }
 452
 453 static _INLINE_ void transmit_chars_pio(struct esp_struct *info,
 454                                         int space_avail)
 455 {
 456         int i;
 457         struct esp_pio_buffer *pio_buf;
 458
 459         pio_buf = get_pio_buffer();
 460
 461         if (!pio_buf)
 462                 return;
 463
 464         while (space_avail && info->xmit_cnt) {
 465                 if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
 466                         memcpy(pio_buf->data,
 467                                &(info->xmit_buf[info->xmit_tail]),
 468                                space_avail);
 469                 } else {
 470                         i = ESP_XMIT_SIZE - info->xmit_tail;
 471                         memcpy(pio_buf->data,
 472                                &(info->xmit_buf[info->xmit_tail]), i);
 473                         memcpy(&(pio_buf->data[i]), info->xmit_buf,
 474                                space_avail - i);
 475                 }
 476
 477                 info->xmit_cnt -= space_avail;
 478                 info->xmit_tail = (info->xmit_tail + space_avail) &
 479                         (ESP_XMIT_SIZE - 1);
 480
 481                 sti();
 482
 483                 for (i = 0; i < space_avail - 1; i += 2) {
 484                         outw(*((unsigned short *)(pio_buf->data + i)),
 485                              info->port + UART_ESI_TX);
 486                 }
 487
 488                 if (space_avail & 0x0001)
 489                         serial_out(info, UART_ESI_TX,
 490                                    pio_buf->data[space_avail - 1]);
 491
 492                 cli();
 493
 494                 if (info->xmit_cnt) {
 495                         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
 496                         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
 497                         space_avail = serial_in(info, UART_ESI_STAT1) << 8;
 498                         space_avail |= serial_in(info, UART_ESI_STAT2);
 499
 500                         if (space_avail > info->xmit_cnt)
 501                                 space_avail = info->xmit_cnt;
 502                 }
 503         }
 504
 505         if (info->xmit_cnt < WAKEUP_CHARS) {
 506                 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
 507
 508 #ifdef SERIAL_DEBUG_INTR
 509                 printk("THRE...");
 510 #endif
 511
 512                 if (info->xmit_cnt <= 0) {
 513                         info->IER &= ~UART_IER_THRI;
 514                         serial_out(info, UART_ESI_CMD1,
 515                                    ESI_SET_SRV_MASK);
 516                         serial_out(info, UART_ESI_CMD2, info->IER);
 517                 }
 518         }
 519
 520         release_pio_buffer(pio_buf);
 521 }
 522
 523 static _INLINE_ void transmit_chars_dma(struct esp_struct *info, int num_bytes)
 524 {
 525         unsigned long flags;
 526
 527         dma_bytes = num_bytes;
 528
 529         if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
 530                 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
 531                        dma_bytes);
 532         } else {
 533                 int i = ESP_XMIT_SIZE - info->xmit_tail;
 534                 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
 535                         i);
 536                 memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
 537         }
 538
 539         info->xmit_cnt -= dma_bytes;
 540         info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
 541
 542         if (info->xmit_cnt < WAKEUP_CHARS) {
 543                 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
 544
 545 #ifdef SERIAL_DEBUG_INTR
 546                 printk("THRE...");
 547 #endif
 548
 549                 if (info->xmit_cnt <= 0) {
 550                         info->IER &= ~UART_IER_THRI;
 551                         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
 552                         serial_out(info, UART_ESI_CMD2, info->IER);
 553                 }
 554         }
 555
 556         info->stat_flags |= ESP_STAT_DMA_TX;
 557
 558         flags=claim_dma_lock();
 559         disable_dma(dma);
 560         clear_dma_ff(dma);
 561         set_dma_mode(dma, DMA_MODE_WRITE);
 562         set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
 563         set_dma_count(dma, dma_bytes);
 564         enable_dma(dma);
 565         release_dma_lock(flags);
 566
 567         serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
 568 }
 569
 570 static _INLINE_ void transmit_chars_dma_done(struct esp_struct *info)
 571 {
 572         int num_bytes;
 573         unsigned long flags;
 574
 575
 576         flags=claim_dma_lock();
 577         disable_dma(dma);
 578         clear_dma_ff(dma);
 579
 580         num_bytes = dma_bytes - get_dma_residue(dma);
 581         info->icount.tx += dma_bytes;
 582         release_dma_lock(flags);
 583
 584         if (dma_bytes != num_bytes) {
 585                 dma_bytes -= num_bytes;
 586                 memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
 587
 588                 flags=claim_dma_lock();
 589                 disable_dma(dma);
 590                 clear_dma_ff(dma);
 591                 set_dma_mode(dma, DMA_MODE_WRITE);
 592                 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
 593                 set_dma_count(dma, dma_bytes);
 594                 enable_dma(dma);
 595                 release_dma_lock(flags);
 596
 597                 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
 598         } else {
 599                 dma_bytes = 0;
 600                 info->stat_flags &= ~ESP_STAT_DMA_TX;
 601         }
 602 }
 603
 604 static _INLINE_ void check_modem_status(struct esp_struct *info)
 605 {
 606         int     status;
 607
 608         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
 609         status = serial_in(info, UART_ESI_STAT2);
 610
 611         if (status & UART_MSR_ANY_DELTA) {
 612                 /* update input line counters */
 613                 if (status & UART_MSR_TERI)
 614                         info->icount.rng++;
 615                 if (status & UART_MSR_DDSR)
 616                         info->icount.dsr++;
 617                 if (status & UART_MSR_DDCD)
 618                         info->icount.dcd++;
 619                 if (status & UART_MSR_DCTS)
 620                         info->icount.cts++;
 621                 wake_up_interruptible(&info->delta_msr_wait);
 622         }
 623
 624         if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 625 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 626                 printk("ttys%d CD now %s...", info->line,
 627                        (status & UART_MSR_DCD) ? "on" : "off");
 628 #endif
 629                 if (status & UART_MSR_DCD)
 630                         wake_up_interruptible(&info->open_wait);
 631                 else {
 632 #ifdef SERIAL_DEBUG_OPEN
 633                         printk("scheduling hangup...");
 634 #endif
 635                         schedule_work(&info->tqueue_hangup);
 636                 }
 637         }
 638 }
 639
 640 /*
 641  * This is the serial driver's interrupt routine
 642  */
 643 static irqreturn_t rs_interrupt_single(int irq, void *dev_id,
 644                                         struct pt_regs *regs)
 645 {
 646         struct esp_struct * info;
 647         unsigned err_status;
 648         unsigned int scratch;
 649
 650 #ifdef SERIAL_DEBUG_INTR
 651         printk("rs_interrupt_single(%d)...", irq);
 652 #endif
 653         info = (struct esp_struct *)dev_id;
 654         err_status = 0;
 655         scratch = serial_in(info, UART_ESI_SID);
 656
 657         cli();
 658
 659         if (!info->tty) {
 660                 sti();
 661                 return IRQ_NONE;
 662         }
 663
 664         if (scratch & 0x04) { /* error */
 665                 serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
 666                 err_status = serial_in(info, UART_ESI_STAT1);
 667                 serial_in(info, UART_ESI_STAT2);
 668
 669                 if (err_status & 0x01)
 670                         info->stat_flags |= ESP_STAT_RX_TIMEOUT;
 671
 672                 if (err_status & 0x20) /* UART status */
 673                         check_modem_status(info);
 674
 675                 if (err_status & 0x80) /* Start break */
 676                         wake_up_interruptible(&info->break_wait);
 677         }
 678
 679         if ((scratch & 0x88) || /* DMA completed or timed out */
 680             (err_status & 0x1c) /* receive error */) {
 681                 if (info->stat_flags & ESP_STAT_DMA_RX)
 682                         receive_chars_dma_done(info, err_status);
 683                 else if (info->stat_flags & ESP_STAT_DMA_TX)
 684                         transmit_chars_dma_done(info);
 685         }
 686
 687         if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
 688             ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
 689             (info->IER & UART_IER_RDI)) {
 690                 int num_bytes;
 691
 692                 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
 693                 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_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 > (TTY_FLIPBUF_SIZE - info->tty->flip.count))
 698                   num_bytes = TTY_FLIPBUF_SIZE - info->tty->flip.count;
 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                                 receive_chars_pio(info, num_bytes);
 705                         else
 706                                 receive_chars_dma(info, num_bytes);
 707                 }
 708         }
 709
 710         if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
 711             (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
 712                 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
 713                         info->IER &= ~UART_IER_THRI;
 714                         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
 715                         serial_out(info, UART_ESI_CMD2, info->IER);
 716                 } else {
 717                         int num_bytes;
 718
 719                         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
 720                         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
 721                         num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
 722                         num_bytes |= serial_in(info, UART_ESI_STAT2);
 723
 724                         if (num_bytes > info->xmit_cnt)
 725                                 num_bytes = info->xmit_cnt;
 726
 727                         if (num_bytes) {
 728                                 if (dma_bytes ||
 729                                     (info->stat_flags & ESP_STAT_USE_PIO) ||
 730                                     (num_bytes <= info->config.pio_threshold))
 731                                         transmit_chars_pio(info, num_bytes);
 732                                 else
 733                                         transmit_chars_dma(info, num_bytes);
 734                         }
 735                 }
 736         }
 737
 738         info->last_active = jiffies;
 739
 740 #ifdef SERIAL_DEBUG_INTR
 741         printk("end.\n");
 742 #endif
 743         sti();
 744         return IRQ_HANDLED;
 745 }
 746
 747 /*
 748  * -------------------------------------------------------------------
 749  * Here ends the serial interrupt routines.
 750  * -------------------------------------------------------------------
 751  */
 752
 753 static void do_softint(void *private_)
 754 {
 755         struct esp_struct       *info = (struct esp_struct *) private_;
 756         struct tty_struct       *tty;
 757
 758         tty = info->tty;
 759         if (!tty)
 760                 return;
 761
 762         if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
 763                 tty_wakeup(tty);
 764         }
 765 }
 766
 767 /*
 768  * This routine is called from the scheduler tqueue when the interrupt
 769  * routine has signalled that a hangup has occurred.  The path of
 770  * hangup processing is:
 771  *
 772  *      serial interrupt routine -> (scheduler tqueue) ->
 773  *      do_serial_hangup() -> tty->hangup() -> esp_hangup()
 774  *
 775  */
 776 static void do_serial_hangup(void *private_)
 777 {
 778         struct esp_struct       *info = (struct esp_struct *) private_;
 779         struct tty_struct       *tty;
 780
 781         tty = info->tty;
 782         if (tty)
 783                 tty_hangup(tty);
 784 }
 785
 786 /*
 787  * ---------------------------------------------------------------
 788  * Low level utility subroutines for the serial driver:  routines to
 789  * figure out the appropriate timeout for an interrupt chain, routines
 790  * to initialize and startup a serial port, and routines to shutdown a
 791  * serial port.  Useful stuff like that.
 792  * ---------------------------------------------------------------
 793  */
 794
 795 static _INLINE_ void esp_basic_init(struct esp_struct * info)
 796 {
 797         /* put ESPC in enhanced mode */
 798         serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
 799
 800         if (info->stat_flags & ESP_STAT_NEVER_DMA)
 801                 serial_out(info, UART_ESI_CMD2, 0x01);
 802         else
 803                 serial_out(info, UART_ESI_CMD2, 0x31);
 804
 805         /* disable interrupts for now */
 806         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
 807         serial_out(info, UART_ESI_CMD2, 0x00);
 808
 809         /* set interrupt and DMA channel */
 810         serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
 811
 812         if (info->stat_flags & ESP_STAT_NEVER_DMA)
 813                 serial_out(info, UART_ESI_CMD2, 0x01);
 814         else
 815                 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
 816
 817         serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
 818
 819         if (info->line % 8)     /* secondary port */
 820                 serial_out(info, UART_ESI_CMD2, 0x0d);  /* shared */
 821         else if (info->irq == 9)
 822                 serial_out(info, UART_ESI_CMD2, 0x02);
 823         else
 824                 serial_out(info, UART_ESI_CMD2, info->irq);
 825
 826         /* set error status mask (check this) */
 827         serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
 828
 829         if (info->stat_flags & ESP_STAT_NEVER_DMA)
 830                 serial_out(info, UART_ESI_CMD2, 0xa1);
 831         else
 832                 serial_out(info, UART_ESI_CMD2, 0xbd);
 833
 834         serial_out(info, UART_ESI_CMD2, 0x00);
 835
 836         /* set DMA timeout */
 837         serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
 838         serial_out(info, UART_ESI_CMD2, 0xff);
 839
 840         /* set FIFO trigger levels */
 841         serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
 842         serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
 843         serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
 844         serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
 845         serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
 846
 847         /* Set clock scaling and wait states */
 848         serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
 849         serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
 850
 851         /* set reinterrupt pacing */
 852         serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
 853         serial_out(info, UART_ESI_CMD2, 0xff);
 854 }
 855
 856 static int startup(struct esp_struct * info)
 857 {
 858         unsigned long flags;
 859         int     retval=0;
 860         unsigned int num_chars;
 861
 862         save_flags(flags); cli();
 863
 864         if (info->flags & ASYNC_INITIALIZED)
 865                 goto out;
 866
 867         if (!info->xmit_buf) {
 868                 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
 869                 retval = -ENOMEM;
 870                 if (!info->xmit_buf)
 871                         goto out;
 872         }
 873
 874 #ifdef SERIAL_DEBUG_OPEN
 875         printk("starting up ttys%d (irq %d)...", info->line, info->irq);
 876 #endif
 877
 878         /* Flush the RX buffer.  Using the ESI flush command may cause */
 879         /* wild interrupts, so read all the data instead. */
 880
 881         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
 882         serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
 883         num_chars = serial_in(info, UART_ESI_STAT1) << 8;
 884         num_chars |= serial_in(info, UART_ESI_STAT2);
 885
 886         while (num_chars > 1) {
 887                 inw(info->port + UART_ESI_RX);
 888                 num_chars -= 2;
 889         }
 890
 891         if (num_chars)
 892                 serial_in(info, UART_ESI_RX);
 893
 894         /* set receive character timeout */
 895         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
 896         serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
 897
 898         /* clear all flags except the "never DMA" flag */
 899         info->stat_flags &= ESP_STAT_NEVER_DMA;
 900
 901         if (info->stat_flags & ESP_STAT_NEVER_DMA)
 902                 info->stat_flags |= ESP_STAT_USE_PIO;
 903
 904         /*
 905          * Allocate the IRQ
 906          */
 907
 908         retval = request_irq(info->irq, rs_interrupt_single, SA_SHIRQ,
 909                              "esp serial", info);
 910
 911         if (retval) {
 912                 if (capable(CAP_SYS_ADMIN)) {
 913                         if (info->tty)
 914                                 set_bit(TTY_IO_ERROR,
 915                                         &info->tty->flags);
 916                         retval = 0;
 917                 }
 918                 goto out;
 919         }
 920
 921         if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
 922                 dma_buffer = (char *)__get_dma_pages(
 923                         GFP_KERNEL, get_order(DMA_BUFFER_SZ));
 924
 925                 /* use PIO mode if DMA buf/chan cannot be allocated */
 926                 if (!dma_buffer)
 927                         info->stat_flags |= ESP_STAT_USE_PIO;
 928                 else if (request_dma(dma, "esp serial")) {
 929                         free_pages((unsigned long)dma_buffer,
 930                                    get_order(DMA_BUFFER_SZ));
 931                         dma_buffer = NULL;
 932                         info->stat_flags |= ESP_STAT_USE_PIO;
 933                 }
 934
 935         }
 936
 937         info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
 938         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
 939         serial_out(info, UART_ESI_CMD2, UART_MCR);
 940         serial_out(info, UART_ESI_CMD2, info->MCR);
 941
 942         /*
 943          * Finally, enable interrupts
 944          */
 945         /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
 946         info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
 947                         UART_IER_DMA_TC;
 948         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
 949         serial_out(info, UART_ESI_CMD2, info->IER);
 950
 951         if (info->tty)
 952                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 953         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 954
 955         /*
 956          * Set up the tty->alt_speed kludge
 957          */
 958         if (info->tty) {
 959                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 960                         info->tty->alt_speed = 57600;
 961                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 962                         info->tty->alt_speed = 115200;
 963                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 964                         info->tty->alt_speed = 230400;
 965                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 966                         info->tty->alt_speed = 460800;
 967         }
 968
 969         /*
 970          * set the speed of the serial port
 971          */
 972         change_speed(info);
 973
 974         info->flags |= ASYNC_INITIALIZED;
 975         retval = 0;
 976 out:    restore_flags(flags);
 977         return retval;
 978 }
 979
 980 /*
 981  * This routine will shutdown a serial port; interrupts are disabled, and
 982  * DTR is dropped if the hangup on close termio flag is on.
 983  */
 984 static void shutdown(struct esp_struct * info)
 985 {
 986         unsigned long   flags, f;
 987
 988         if (!(info->flags & ASYNC_INITIALIZED))
 989                 return;
 990
 991 #ifdef SERIAL_DEBUG_OPEN
 992         printk("Shutting down serial port %d (irq %d)....", info->line,
 993                info->irq);
 994 #endif
 995
 996         save_flags(flags); cli(); /* Disable interrupts */
 997
 998         /*
 999          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1000          * here so the queue might never be waken up
1001          */
1002         wake_up_interruptible(&info->delta_msr_wait);
1003         wake_up_interruptible(&info->break_wait);
1004
1005         /* stop a DMA transfer on the port being closed */
1006
1007         if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
1008                 f=claim_dma_lock();
1009                 disable_dma(dma);
1010                 clear_dma_ff(dma);
1011                 release_dma_lock(f);
1012
1013                 dma_bytes = 0;
1014         }
1015
1016         /*
1017          * Free the IRQ
1018          */
1019         free_irq(info->irq, info);
1020
1021         if (dma_buffer) {
1022                 struct esp_struct *current_port = ports;
1023
1024                 while (current_port) {
1025                         if ((current_port != info) &&
1026                             (current_port->flags & ASYNC_INITIALIZED))
1027                                 break;
1028
1029                         current_port = current_port->next_port;
1030                 }
1031
1032                 if (!current_port) {
1033                         free_dma(dma);
1034                         free_pages((unsigned long)dma_buffer,
1035                                    get_order(DMA_BUFFER_SZ));
1036                         dma_buffer = NULL;
1037                 }
1038         }
1039
1040         if (info->xmit_buf) {
1041                 free_page((unsigned long) info->xmit_buf);
1042                 info->xmit_buf = NULL;
1043         }
1044
1045         info->IER = 0;
1046         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1047         serial_out(info, UART_ESI_CMD2, 0x00);
1048
1049         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1050                 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1051
1052         info->MCR &= ~UART_MCR_OUT2;
1053         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1054         serial_out(info, UART_ESI_CMD2, UART_MCR);
1055         serial_out(info, UART_ESI_CMD2, info->MCR);
1056
1057         if (info->tty)
1058                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1059
1060         info->flags &= ~ASYNC_INITIALIZED;
1061         restore_flags(flags);
1062 }
1063
1064 /*
1065  * This routine is called to set the UART divisor registers to match
1066  * the specified baud rate for a serial port.
1067  */
1068 static void change_speed(struct esp_struct *info)
1069 {
1070         unsigned short port;
1071         int     quot = 0;
1072         unsigned cflag,cval;
1073         int     baud, bits;
1074         unsigned char flow1 = 0, flow2 = 0;
1075         unsigned long flags;
1076
1077         if (!info->tty || !info->tty->termios)
1078                 return;
1079         cflag = info->tty->termios->c_cflag;
1080         port = info->port;
1081
1082         /* byte size and parity */
1083         switch (cflag & CSIZE) {
1084               case CS5: cval = 0x00; bits = 7; break;
1085               case CS6: cval = 0x01; bits = 8; break;
1086               case CS7: cval = 0x02; bits = 9; break;
1087               case CS8: cval = 0x03; bits = 10; break;
1088               default:  cval = 0x00; bits = 7; break;
1089         }
1090         if (cflag & CSTOPB) {
1091                 cval |= 0x04;
1092                 bits++;
1093         }
1094         if (cflag & PARENB) {
1095                 cval |= UART_LCR_PARITY;
1096                 bits++;
1097         }
1098         if (!(cflag & PARODD))
1099                 cval |= UART_LCR_EPAR;
1100 #ifdef CMSPAR
1101         if (cflag & CMSPAR)
1102                 cval |= UART_LCR_SPAR;
1103 #endif
1104
1105         baud = tty_get_baud_rate(info->tty);
1106         if (baud == 38400 &&
1107             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1108                 quot = info->custom_divisor;
1109         else {
1110                 if (baud == 134)
1111                         /* Special case since 134 is really 134.5 */
1112                         quot = (2*BASE_BAUD / 269);
1113                 else if (baud)
1114                         quot = BASE_BAUD / baud;
1115         }
1116         /* If the quotient is ever zero, default to 9600 bps */
1117         if (!quot)
1118                 quot = BASE_BAUD / 9600;
1119
1120         info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1121
1122         /* CTS flow control flag and modem status interrupts */
1123         /* info->IER &= ~UART_IER_MSI; */
1124         if (cflag & CRTSCTS) {
1125                 info->flags |= ASYNC_CTS_FLOW;
1126                 /* info->IER |= UART_IER_MSI; */
1127                 flow1 = 0x04;
1128                 flow2 = 0x10;
1129         } else
1130                 info->flags &= ~ASYNC_CTS_FLOW;
1131         if (cflag & CLOCAL)
1132                 info->flags &= ~ASYNC_CHECK_CD;
1133         else {
1134                 info->flags |= ASYNC_CHECK_CD;
1135                 /* info->IER |= UART_IER_MSI; */
1136         }
1137
1138         /*
1139          * Set up parity check flag
1140          */
1141 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1142
1143         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1144         if (I_INPCK(info->tty))
1145                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1146         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1147                 info->read_status_mask |= UART_LSR_BI;
1148
1149         info->ignore_status_mask = 0;
1150 #if 0
1151         /* This should be safe, but for some broken bits of hardware... */
1152         if (I_IGNPAR(info->tty)) {
1153                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1154                 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1155         }
1156 #endif
1157         if (I_IGNBRK(info->tty)) {
1158                 info->ignore_status_mask |= UART_LSR_BI;
1159                 info->read_status_mask |= UART_LSR_BI;
1160                 /*
1161                  * If we're ignore parity and break indicators, ignore
1162                  * overruns too.  (For real raw support).
1163                  */
1164                 if (I_IGNPAR(info->tty)) {
1165                         info->ignore_status_mask |= UART_LSR_OE | \
1166                                 UART_LSR_PE | UART_LSR_FE;
1167                         info->read_status_mask |= UART_LSR_OE | \
1168                                 UART_LSR_PE | UART_LSR_FE;
1169                 }
1170         }
1171
1172         if (I_IXOFF(info->tty))
1173                 flow1 |= 0x81;
1174
1175         save_flags(flags); cli();
1176         /* set baud */
1177         serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1178         serial_out(info, UART_ESI_CMD2, quot >> 8);
1179         serial_out(info, UART_ESI_CMD2, quot & 0xff);
1180
1181         /* set data bits, parity, etc. */
1182         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1183         serial_out(info, UART_ESI_CMD2, UART_LCR);
1184         serial_out(info, UART_ESI_CMD2, cval);
1185
1186         /* Enable flow control */
1187         serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1188         serial_out(info, UART_ESI_CMD2, flow1);
1189         serial_out(info, UART_ESI_CMD2, flow2);
1190
1191         /* set flow control characters (XON/XOFF only) */
1192         if (I_IXOFF(info->tty)) {
1193                 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1194                 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1195                 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1196                 serial_out(info, UART_ESI_CMD2, 0x10);
1197                 serial_out(info, UART_ESI_CMD2, 0x21);
1198                 switch (cflag & CSIZE) {
1199                         case CS5:
1200                                 serial_out(info, UART_ESI_CMD2, 0x1f);
1201                                 break;
1202                         case CS6:
1203                                 serial_out(info, UART_ESI_CMD2, 0x3f);
1204                                 break;
1205                         case CS7:
1206                         case CS8:
1207                                 serial_out(info, UART_ESI_CMD2, 0x7f);
1208                                 break;
1209                         default:
1210                                 serial_out(info, UART_ESI_CMD2, 0xff);
1211                                 break;
1212                 }
1213         }
1214
1215         /* Set high/low water */
1216         serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1217         serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1218         serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1219         serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1220         serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1221
1222         restore_flags(flags);
1223 }
1224
1225 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1226 {
1227         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1228         unsigned long flags;
1229
1230         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1231                 return;
1232
1233         if (!tty || !info->xmit_buf)
1234                 return;
1235
1236         save_flags(flags); cli();
1237         if (info->xmit_cnt >= ESP_XMIT_SIZE - 1) {
1238                 restore_flags(flags);
1239                 return;
1240         }
1241
1242         info->xmit_buf[info->xmit_head++] = ch;
1243         info->xmit_head &= ESP_XMIT_SIZE-1;
1244         info->xmit_cnt++;
1245         restore_flags(flags);
1246 }
1247
1248 static void rs_flush_chars(struct tty_struct *tty)
1249 {
1250         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1251         unsigned long flags;
1252
1253         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1254                 return;
1255
1256         if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1257                 return;
1258
1259         save_flags(flags); cli();
1260         if (!(info->IER & UART_IER_THRI)) {
1261                 info->IER |= UART_IER_THRI;
1262                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1263                 serial_out(info, UART_ESI_CMD2, info->IER);
1264         }
1265         restore_flags(flags);
1266 }
1267
1268 static int rs_write(struct tty_struct * tty,
1269                     const unsigned char *buf, int count)
1270 {
1271         int     c, t, ret = 0;
1272         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1273         unsigned long flags;
1274
1275         if (serial_paranoia_check(info, tty->name, "rs_write"))
1276                 return 0;
1277
1278         if (!tty || !info->xmit_buf || !tmp_buf)
1279                 return 0;
1280
1281         while (1) {
1282                 /* Thanks to R. Wolff for suggesting how to do this with */
1283                 /* interrupts enabled */
1284
1285                 c = count;
1286                 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1287
1288                 if (t < c)
1289                         c = t;
1290
1291                 t = ESP_XMIT_SIZE - info->xmit_head;
1292
1293                 if (t < c)
1294                         c = t;
1295
1296                 if (c <= 0)
1297                         break;
1298
1299                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1300
1301                 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1302                 info->xmit_cnt += c;
1303                 buf += c;
1304                 count -= c;
1305                 ret += c;
1306         }
1307
1308         save_flags(flags); cli();
1309
1310         if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1311                 info->IER |= UART_IER_THRI;
1312                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1313                 serial_out(info, UART_ESI_CMD2, info->IER);
1314         }
1315
1316         restore_flags(flags);
1317         return ret;
1318 }
1319
1320 static int rs_write_room(struct tty_struct *tty)
1321 {
1322         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1323         int     ret;
1324
1325         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1326                 return 0;
1327         ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1328         if (ret < 0)
1329                 ret = 0;
1330         return ret;
1331 }
1332
1333 static int rs_chars_in_buffer(struct tty_struct *tty)
1334 {
1335         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1336
1337         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1338                 return 0;
1339         return info->xmit_cnt;
1340 }
1341
1342 static void rs_flush_buffer(struct tty_struct *tty)
1343 {
1344         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1345
1346         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1347                 return;
1348         cli();
1349         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1350         sti();
1351         tty_wakeup(tty);
1352 }
1353
1354 /*
1355  * ------------------------------------------------------------
1356  * rs_throttle()
1357  *
1358  * This routine is called by the upper-layer tty layer to signal that
1359  * incoming characters should be throttled.
1360  * ------------------------------------------------------------
1361  */
1362 static void rs_throttle(struct tty_struct * tty)
1363 {
1364         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1365 #ifdef SERIAL_DEBUG_THROTTLE
1366         char    buf[64];
1367
1368         printk("throttle %s: %d....\n", tty_name(tty, buf),
1369                tty->ldisc.chars_in_buffer(tty));
1370 #endif
1371
1372         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1373                 return;
1374
1375         cli();
1376         info->IER &= ~UART_IER_RDI;
1377         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1378         serial_out(info, UART_ESI_CMD2, info->IER);
1379         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1380         serial_out(info, UART_ESI_CMD2, 0x00);
1381         sti();
1382 }
1383
1384 static void rs_unthrottle(struct tty_struct * tty)
1385 {
1386         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1387 #ifdef SERIAL_DEBUG_THROTTLE
1388         char    buf[64];
1389
1390         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1391                tty->ldisc.chars_in_buffer(tty));
1392 #endif
1393
1394         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1395                 return;
1396
1397         cli();
1398         info->IER |= UART_IER_RDI;
1399         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1400         serial_out(info, UART_ESI_CMD2, info->IER);
1401         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1402         serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1403         sti();
1404 }
1405
1406 /*
1407  * ------------------------------------------------------------
1408  * rs_ioctl() and friends
1409  * ------------------------------------------------------------
1410  */
1411
1412 static int get_serial_info(struct esp_struct * info,
1413                            struct serial_struct __user *retinfo)
1414 {
1415         struct serial_struct tmp;
1416
1417         memset(&tmp, 0, sizeof(tmp));
1418         tmp.type = PORT_16550A;
1419         tmp.line = info->line;
1420         tmp.port = info->port;
1421         tmp.irq = info->irq;
1422         tmp.flags = info->flags;
1423         tmp.xmit_fifo_size = 1024;
1424         tmp.baud_base = BASE_BAUD;
1425         tmp.close_delay = info->close_delay;
1426         tmp.closing_wait = info->closing_wait;
1427         tmp.custom_divisor = info->custom_divisor;
1428         tmp.hub6 = 0;
1429         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1430                 return -EFAULT;
1431         return 0;
1432 }
1433
1434 static int get_esp_config(struct esp_struct * info,
1435                           struct hayes_esp_config __user *retinfo)
1436 {
1437         struct hayes_esp_config tmp;
1438
1439         if (!retinfo)
1440                 return -EFAULT;
1441
1442         memset(&tmp, 0, sizeof(tmp));
1443         tmp.rx_timeout = info->config.rx_timeout;
1444         tmp.rx_trigger = info->config.rx_trigger;
1445         tmp.tx_trigger = info->config.tx_trigger;
1446         tmp.flow_off = info->config.flow_off;
1447         tmp.flow_on = info->config.flow_on;
1448         tmp.pio_threshold = info->config.pio_threshold;
1449         tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1450
1451         return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1452 }
1453
1454 static int set_serial_info(struct esp_struct * info,
1455                            struct serial_struct __user *new_info)
1456 {
1457         struct serial_struct new_serial;
1458         struct esp_struct old_info;
1459         unsigned int change_irq;
1460         int retval = 0;
1461         struct esp_struct *current_async;
1462
1463         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1464                 return -EFAULT;
1465         old_info = *info;
1466
1467         if ((new_serial.type != PORT_16550A) ||
1468             (new_serial.hub6) ||
1469             (info->port != new_serial.port) ||
1470             (new_serial.baud_base != BASE_BAUD) ||
1471             (new_serial.irq > 15) ||
1472             (new_serial.irq < 2) ||
1473             (new_serial.irq == 6) ||
1474             (new_serial.irq == 8) ||
1475             (new_serial.irq == 13))
1476                 return -EINVAL;
1477
1478         change_irq = new_serial.irq != info->irq;
1479
1480         if (change_irq && (info->line % 8))
1481                 return -EINVAL;
1482
1483         if (!capable(CAP_SYS_ADMIN)) {
1484                 if (change_irq ||
1485                     (new_serial.close_delay != info->close_delay) ||
1486                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1487                      (info->flags & ~ASYNC_USR_MASK)))
1488                         return -EPERM;
1489                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1490                                (new_serial.flags & ASYNC_USR_MASK));
1491                 info->custom_divisor = new_serial.custom_divisor;
1492         } else {
1493                 if (new_serial.irq == 2)
1494                         new_serial.irq = 9;
1495
1496                 if (change_irq) {
1497                         current_async = ports;
1498
1499                         while (current_async) {
1500                                 if ((current_async->line >= info->line) &&
1501                                     (current_async->line < (info->line + 8))) {
1502                                         if (current_async == info) {
1503                                                 if (current_async->count > 1)
1504                                                         return -EBUSY;
1505                                         } else if (current_async->count)
1506                                                 return -EBUSY;
1507                                 }
1508
1509                                 current_async = current_async->next_port;
1510                         }
1511                 }
1512
1513                 /*
1514                  * OK, past this point, all the error checking has been done.
1515                  * At this point, we start making changes.....
1516                  */
1517
1518                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1519                                (new_serial.flags & ASYNC_FLAGS));
1520                 info->custom_divisor = new_serial.custom_divisor;
1521                 info->close_delay = new_serial.close_delay * HZ/100;
1522                 info->closing_wait = new_serial.closing_wait * HZ/100;
1523
1524                 if (change_irq) {
1525                         /*
1526                          * We need to shutdown the serial port at the old
1527                          * port/irq combination.
1528                          */
1529                         shutdown(info);
1530
1531                         current_async = ports;
1532
1533                         while (current_async) {
1534                                 if ((current_async->line >= info->line) &&
1535                                     (current_async->line < (info->line + 8)))
1536                                         current_async->irq = new_serial.irq;
1537
1538                                 current_async = current_async->next_port;
1539                         }
1540
1541                         serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1542                         if (info->irq == 9)
1543                                 serial_out(info, UART_ESI_CMD2, 0x02);
1544                         else
1545                                 serial_out(info, UART_ESI_CMD2, info->irq);
1546                 }
1547         }
1548
1549         if (info->flags & ASYNC_INITIALIZED) {
1550                 if (((old_info.flags & ASYNC_SPD_MASK) !=
1551                      (info->flags & ASYNC_SPD_MASK)) ||
1552                     (old_info.custom_divisor != info->custom_divisor)) {
1553                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1554                                 info->tty->alt_speed = 57600;
1555                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1556                                 info->tty->alt_speed = 115200;
1557                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1558                                 info->tty->alt_speed = 230400;
1559                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1560                                 info->tty->alt_speed = 460800;
1561                         change_speed(info);
1562                 }
1563         } else
1564                 retval = startup(info);
1565
1566         return retval;
1567 }
1568
1569 static int set_esp_config(struct esp_struct * info,
1570                           struct hayes_esp_config __user * new_info)
1571 {
1572         struct hayes_esp_config new_config;
1573         unsigned int change_dma;
1574         int retval = 0;
1575         struct esp_struct *current_async;
1576
1577         /* Perhaps a non-sysadmin user should be able to do some of these */
1578         /* operations.  I haven't decided yet. */
1579
1580         if (!capable(CAP_SYS_ADMIN))
1581                 return -EPERM;
1582
1583         if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1584                 return -EFAULT;
1585
1586         if ((new_config.flow_on >= new_config.flow_off) ||
1587             (new_config.rx_trigger < 1) ||
1588             (new_config.tx_trigger < 1) ||
1589             (new_config.flow_off < 1) ||
1590             (new_config.flow_on < 1) ||
1591             (new_config.rx_trigger > 1023) ||
1592             (new_config.tx_trigger > 1023) ||
1593             (new_config.flow_off > 1023) ||
1594             (new_config.flow_on > 1023) ||
1595             (new_config.pio_threshold < 0) ||
1596             (new_config.pio_threshold > 1024))
1597                 return -EINVAL;
1598
1599         if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1600                 new_config.dma_channel = 0;
1601
1602         if (info->stat_flags & ESP_STAT_NEVER_DMA)
1603                 change_dma = new_config.dma_channel;
1604         else
1605                 change_dma = (new_config.dma_channel != dma);
1606
1607         if (change_dma) {
1608                 if (new_config.dma_channel) {
1609                         /* PIO mode to DMA mode transition OR */
1610                         /* change current DMA channel */
1611
1612                         current_async = ports;
1613
1614                         while (current_async) {
1615                                 if (current_async == info) {
1616                                         if (current_async->count > 1)
1617                                                 return -EBUSY;
1618                                 } else if (current_async->count)
1619                                         return -EBUSY;
1620
1621                                 current_async =
1622                                         current_async->next_port;
1623                         }
1624
1625                         shutdown(info);
1626                         dma = new_config.dma_channel;
1627                         info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1628
1629                         /* all ports must use the same DMA channel */
1630
1631                         current_async = ports;
1632
1633                         while (current_async) {
1634                                 esp_basic_init(current_async);
1635                                 current_async = current_async->next_port;
1636                         }
1637                 } else {
1638                         /* DMA mode to PIO mode only */
1639
1640                         if (info->count > 1)
1641                                 return -EBUSY;
1642
1643                         shutdown(info);
1644                         info->stat_flags |= ESP_STAT_NEVER_DMA;
1645                         esp_basic_init(info);
1646                 }
1647         }
1648
1649         info->config.pio_threshold = new_config.pio_threshold;
1650
1651         if ((new_config.flow_off != info->config.flow_off) ||
1652             (new_config.flow_on != info->config.flow_on)) {
1653                 unsigned long flags;
1654
1655                 info->config.flow_off = new_config.flow_off;
1656                 info->config.flow_on = new_config.flow_on;
1657                 save_flags(flags); cli();
1658                 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1659                 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1660                 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1661                 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1662                 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1663                 restore_flags(flags);
1664         }
1665
1666         if ((new_config.rx_trigger != info->config.rx_trigger) ||
1667             (new_config.tx_trigger != info->config.tx_trigger)) {
1668                 unsigned long flags;
1669
1670                 info->config.rx_trigger = new_config.rx_trigger;
1671                 info->config.tx_trigger = new_config.tx_trigger;
1672                 save_flags(flags); cli();
1673                 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1674                 serial_out(info, UART_ESI_CMD2,
1675                            new_config.rx_trigger >> 8);
1676                 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1677                 serial_out(info, UART_ESI_CMD2,
1678                            new_config.tx_trigger >> 8);
1679                 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1680                 restore_flags(flags);
1681         }
1682
1683         if (new_config.rx_timeout != info->config.rx_timeout) {
1684                 unsigned long flags;
1685
1686                 info->config.rx_timeout = new_config.rx_timeout;
1687                 save_flags(flags); cli();
1688
1689                 if (info->IER & UART_IER_RDI) {
1690                         serial_out(info, UART_ESI_CMD1,
1691                                    ESI_SET_RX_TIMEOUT);
1692                         serial_out(info, UART_ESI_CMD2,
1693                                    new_config.rx_timeout);
1694                 }
1695
1696                 restore_flags(flags);
1697         }
1698
1699         if (!(info->flags & ASYNC_INITIALIZED))
1700                 retval = startup(info);
1701
1702         return retval;
1703 }
1704
1705 /*
1706  * get_lsr_info - get line status register info
1707  *
1708  * Purpose: Let user call ioctl() to get info when the UART physically
1709  *          is emptied.  On bus types like RS485, the transmitter must
1710  *          release the bus after transmitting. This must be done when
1711  *          the transmit shift register is empty, not be done when the
1712  *          transmit holding register is empty.  This functionality
1713  *          allows an RS485 driver to be written in user space.
1714  */
1715 static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1716 {
1717         unsigned char status;
1718         unsigned int result;
1719
1720         cli();
1721         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1722         status = serial_in(info, UART_ESI_STAT1);
1723         sti();
1724         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1725         return put_user(result,value);
1726 }
1727
1728
1729 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1730 {
1731         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1732         unsigned char control, status;
1733
1734         if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1735                 return -ENODEV;
1736         if (tty->flags & (1 << TTY_IO_ERROR))
1737                 return -EIO;
1738
1739         control = info->MCR;
1740         cli();
1741         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1742         status = serial_in(info, UART_ESI_STAT2);
1743         sti();
1744         return    ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1745                 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1746                 | ((status  & UART_MSR_DCD) ? TIOCM_CAR : 0)
1747                 | ((status  & UART_MSR_RI) ? TIOCM_RNG : 0)
1748                 | ((status  & UART_MSR_DSR) ? TIOCM_DSR : 0)
1749                 | ((status  & UART_MSR_CTS) ? TIOCM_CTS : 0);
1750 }
1751
1752 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1753                         unsigned int set, unsigned int clear)
1754 {
1755         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1756
1757         if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1758                 return -ENODEV;
1759         if (tty->flags & (1 << TTY_IO_ERROR))
1760                 return -EIO;
1761
1762         cli();
1763
1764         if (set & TIOCM_RTS)
1765                 info->MCR |= UART_MCR_RTS;
1766         if (set & TIOCM_DTR)
1767                 info->MCR |= UART_MCR_DTR;
1768
1769         if (clear & TIOCM_RTS)
1770                 info->MCR &= ~UART_MCR_RTS;
1771         if (clear & TIOCM_DTR)
1772                 info->MCR &= ~UART_MCR_DTR;
1773
1774         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1775         serial_out(info, UART_ESI_CMD2, UART_MCR);
1776         serial_out(info, UART_ESI_CMD2, info->MCR);
1777         sti();
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         save_flags(flags); cli();
1793         if (break_state == -1) {
1794                 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1795                 serial_out(info, UART_ESI_CMD2, 0x01);
1796
1797                 interruptible_sleep_on(&info->break_wait);
1798         } else {
1799                 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1800                 serial_out(info, UART_ESI_CMD2, 0x00);
1801         }
1802         restore_flags(flags);
1803 }
1804
1805 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1806                     unsigned int cmd, unsigned long arg)
1807 {
1808         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1809         struct async_icount cprev, cnow;        /* kernel counter temps */
1810         struct serial_icounter_struct __user *p_cuser;  /* user space */
1811         void __user *argp = (void __user *)arg;
1812
1813         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1814                 return -ENODEV;
1815
1816         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1817             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
1818             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1819             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1820             (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1821                 if (tty->flags & (1 << TTY_IO_ERROR))
1822                     return -EIO;
1823         }
1824
1825         switch (cmd) {
1826                 case TIOCGSERIAL:
1827                         return get_serial_info(info, argp);
1828                 case TIOCSSERIAL:
1829                         return set_serial_info(info, argp);
1830                 case TIOCSERCONFIG:
1831                         /* do not reconfigure after initial configuration */
1832                         return 0;
1833
1834                 case TIOCSERGWILD:
1835                         return put_user(0L, (unsigned long __user *)argp);
1836
1837                 case TIOCSERGETLSR: /* Get line status register */
1838                             return get_lsr_info(info, argp);
1839
1840                 case TIOCSERSWILD:
1841                         if (!capable(CAP_SYS_ADMIN))
1842                                 return -EPERM;
1843                         return 0;
1844
1845                 /*
1846                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1847                  * - mask passed in arg for lines of interest
1848                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1849                  * Caller should use TIOCGICOUNT to see which one it was
1850                  */
1851                  case TIOCMIWAIT:
1852                         cli();
1853                         cprev = info->icount;   /* note the counters on entry */
1854                         sti();
1855                         while (1) {
1856                                 interruptible_sleep_on(&info->delta_msr_wait);
1857                                 /* see if a signal did it */
1858                                 if (signal_pending(current))
1859                                         return -ERESTARTSYS;
1860                                 cli();
1861                                 cnow = info->icount;    /* atomic copy */
1862                                 sti();
1863                                 if (cnow.rng == cprev.rng &&
1864                                     cnow.dsr == cprev.dsr &&
1865                                     cnow.dcd == cprev.dcd &&
1866                                     cnow.cts == cprev.cts)
1867                                         return -EIO; /* no change => error */
1868                                 if (((arg & TIOCM_RNG) &&
1869                                      (cnow.rng != cprev.rng)) ||
1870                                      ((arg & TIOCM_DSR) &&
1871                                       (cnow.dsr != cprev.dsr)) ||
1872                                      ((arg & TIOCM_CD) &&
1873                                       (cnow.dcd != cprev.dcd)) ||
1874                                      ((arg & TIOCM_CTS) &&
1875                                       (cnow.cts != cprev.cts)) ) {
1876                                         return 0;
1877                                 }
1878                                 cprev = cnow;
1879                         }
1880                         /* NOTREACHED */
1881
1882                 /*
1883                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1884                  * Return: write counters to the user passed counter struct
1885                  * NB: both 1->0 and 0->1 transitions are counted except for
1886                  *     RI where only 0->1 is counted.
1887                  */
1888                 case TIOCGICOUNT:
1889                         cli();
1890                         cnow = info->icount;
1891                         sti();
1892                         p_cuser = argp;
1893                         if (put_user(cnow.cts, &p_cuser->cts) ||
1894                             put_user(cnow.dsr, &p_cuser->dsr) ||
1895                             put_user(cnow.rng, &p_cuser->rng) ||
1896                             put_user(cnow.dcd, &p_cuser->dcd))
1897                                 return -EFAULT;
1898
1899                         return 0;
1900         case TIOCGHAYESESP:
1901                 return get_esp_config(info, argp);
1902         case TIOCSHAYESESP:
1903                 return set_esp_config(info, argp);
1904
1905                 default:
1906                         return -ENOIOCTLCMD;
1907                 }
1908         return 0;
1909 }
1910
1911 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1912 {
1913         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1914
1915         if (   (tty->termios->c_cflag == old_termios->c_cflag)
1916             && (   RELEVANT_IFLAG(tty->termios->c_iflag)
1917                 == RELEVANT_IFLAG(old_termios->c_iflag)))
1918           return;
1919
1920         change_speed(info);
1921
1922         /* Handle transition to B0 status */
1923         if ((old_termios->c_cflag & CBAUD) &&
1924                 !(tty->termios->c_cflag & CBAUD)) {
1925                 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1926                 cli();
1927                 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1928                 serial_out(info, UART_ESI_CMD2, UART_MCR);
1929                 serial_out(info, UART_ESI_CMD2, info->MCR);
1930                 sti();
1931         }
1932
1933         /* Handle transition away from B0 status */
1934         if (!(old_termios->c_cflag & CBAUD) &&
1935                 (tty->termios->c_cflag & CBAUD)) {
1936                 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1937                 cli();
1938                 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1939                 serial_out(info, UART_ESI_CMD2, UART_MCR);
1940                 serial_out(info, UART_ESI_CMD2, info->MCR);
1941                 sti();
1942         }
1943
1944         /* Handle turning of CRTSCTS */
1945         if ((old_termios->c_cflag & CRTSCTS) &&
1946             !(tty->termios->c_cflag & CRTSCTS)) {
1947                 rs_start(tty);
1948         }
1949
1950 #if 0
1951         /*
1952          * No need to wake up processes in open wait, since they
1953          * sample the CLOCAL flag once, and don't recheck it.
1954          * XXX  It's not clear whether the current behavior is correct
1955          * or not.  Hence, this may change.....
1956          */
1957         if (!(old_termios->c_cflag & CLOCAL) &&
1958             (tty->termios->c_cflag & CLOCAL))
1959                 wake_up_interruptible(&info->open_wait);
1960 #endif
1961 }
1962
1963 /*
1964  * ------------------------------------------------------------
1965  * rs_close()
1966  *
1967  * This routine is called when the serial port gets closed.  First, we
1968  * wait for the last remaining data to be sent.  Then, we unlink its
1969  * async structure from the interrupt chain if necessary, and we free
1970  * that IRQ if nothing is left in the chain.
1971  * ------------------------------------------------------------
1972  */
1973 static void rs_close(struct tty_struct *tty, struct file * filp)
1974 {
1975         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1976         unsigned long flags;
1977
1978         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1979                 return;
1980
1981         save_flags(flags); cli();
1982
1983         if (tty_hung_up_p(filp)) {
1984                 DBG_CNT("before DEC-hung");
1985                 goto out;
1986         }
1987
1988 #ifdef SERIAL_DEBUG_OPEN
1989         printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1990 #endif
1991         if ((tty->count == 1) && (info->count != 1)) {
1992                 /*
1993                  * Uh, oh.  tty->count is 1, which means that the tty
1994                  * structure will be freed.  Info->count should always
1995                  * be one in these conditions.  If it's greater than
1996                  * one, we've got real problems, since it means the
1997                  * serial port won't be shutdown.
1998                  */
1999                 printk("rs_close: bad serial port count; tty->count is 1, "
2000                        "info->count is %d\n", info->count);
2001                 info->count = 1;
2002         }
2003         if (--info->count < 0) {
2004                 printk("rs_close: bad serial port count for ttys%d: %d\n",
2005                        info->line, info->count);
2006                 info->count = 0;
2007         }
2008         if (info->count) {
2009                 DBG_CNT("before DEC-2");
2010                 goto out;
2011         }
2012         info->flags |= ASYNC_CLOSING;
2013         /*
2014          * Now we wait for the transmit buffer to clear; and we notify
2015          * the line discipline to only process XON/XOFF characters.
2016          */
2017         tty->closing = 1;
2018         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
2019                 tty_wait_until_sent(tty, info->closing_wait);
2020         /*
2021          * At this point we stop accepting input.  To do this, we
2022          * disable the receive line status interrupts, and tell the
2023          * interrupt driver to stop checking the data ready bit in the
2024          * line status register.
2025          */
2026         /* info->IER &= ~UART_IER_RLSI; */
2027         info->IER &= ~UART_IER_RDI;
2028         info->read_status_mask &= ~UART_LSR_DR;
2029         if (info->flags & ASYNC_INITIALIZED) {
2030                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
2031                 serial_out(info, UART_ESI_CMD2, info->IER);
2032
2033                 /* disable receive timeout */
2034                 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
2035                 serial_out(info, UART_ESI_CMD2, 0x00);
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 out:
2061         restore_flags(flags);
2062 }
2063
2064 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2065 {
2066         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2067         unsigned long orig_jiffies, char_time;
2068         unsigned long flags;
2069
2070         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2071                 return;
2072
2073         orig_jiffies = jiffies;
2074         char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2075
2076         if (!char_time)
2077                 char_time = 1;
2078
2079         save_flags(flags); cli();
2080         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2081         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2082
2083         while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2084                 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2085                 msleep_interruptible(jiffies_to_msecs(char_time));
2086
2087                 if (signal_pending(current))
2088                         break;
2089
2090                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2091                         break;
2092
2093                 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2094                 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2095         }
2096
2097         restore_flags(flags);
2098         set_current_state(TASK_RUNNING);
2099 }
2100
2101 /*
2102  * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2103  */
2104 static void esp_hangup(struct tty_struct *tty)
2105 {
2106         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2107
2108         if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2109                 return;
2110
2111         rs_flush_buffer(tty);
2112         shutdown(info);
2113         info->event = 0;
2114         info->count = 0;
2115         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2116         info->tty = NULL;
2117         wake_up_interruptible(&info->open_wait);
2118 }
2119
2120 /*
2121  * ------------------------------------------------------------
2122  * esp_open() and friends
2123  * ------------------------------------------------------------
2124  */
2125 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2126                            struct esp_struct *info)
2127 {
2128         DECLARE_WAITQUEUE(wait, current);
2129         int             retval;
2130         int             do_clocal = 0;
2131         unsigned long   flags;
2132
2133         /*
2134          * If the device is in the middle of being closed, then block
2135          * until it's done, and then try again.
2136          */
2137         if (tty_hung_up_p(filp) ||
2138             (info->flags & ASYNC_CLOSING)) {
2139                 if (info->flags & ASYNC_CLOSING)
2140                         interruptible_sleep_on(&info->close_wait);
2141 #ifdef SERIAL_DO_RESTART
2142                 if (info->flags & ASYNC_HUP_NOTIFY)
2143                         return -EAGAIN;
2144                 else
2145                         return -ERESTARTSYS;
2146 #else
2147                 return -EAGAIN;
2148 #endif
2149         }
2150
2151         /*
2152          * If non-blocking mode is set, or the port is not enabled,
2153          * then make the check up front and then exit.
2154          */
2155         if ((filp->f_flags & O_NONBLOCK) ||
2156             (tty->flags & (1 << TTY_IO_ERROR))) {
2157                 info->flags |= ASYNC_NORMAL_ACTIVE;
2158                 return 0;
2159         }
2160
2161         if (tty->termios->c_cflag & CLOCAL)
2162                 do_clocal = 1;
2163
2164         /*
2165          * Block waiting for the carrier detect and the line to become
2166          * free (i.e., not in use by the callout).  While we are in
2167          * this loop, info->count is dropped by one, so that
2168          * rs_close() knows when to free things.  We restore it upon
2169          * exit, either normal or abnormal.
2170          */
2171         retval = 0;
2172         add_wait_queue(&info->open_wait, &wait);
2173 #ifdef SERIAL_DEBUG_OPEN
2174         printk("block_til_ready before block: ttys%d, count = %d\n",
2175                info->line, info->count);
2176 #endif
2177         save_flags(flags);
2178         cli();
2179         if (!tty_hung_up_p(filp))
2180                 info->count--;
2181         restore_flags(flags);
2182         info->blocked_open++;
2183         while (1) {
2184                 save_flags(flags);
2185                 cli();
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                 restore_flags(flags);
2198                 set_current_state(TASK_INTERRUPTIBLE);
2199                 if (tty_hung_up_p(filp) ||
2200                     !(info->flags & ASYNC_INITIALIZED)) {
2201 #ifdef SERIAL_DO_RESTART
2202                         if (info->flags & ASYNC_HUP_NOTIFY)
2203                                 retval = -EAGAIN;
2204                         else
2205                                 retval = -ERESTARTSYS;
2206 #else
2207                         retval = -EAGAIN;
2208 #endif
2209                         break;
2210                 }
2211
2212                 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2213                 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2214                         do_clocal = 1;
2215
2216                 if (!(info->flags & ASYNC_CLOSING) &&
2217                     (do_clocal))
2218                         break;
2219                 if (signal_pending(current)) {
2220                         retval = -ERESTARTSYS;
2221                         break;
2222                 }
2223 #ifdef SERIAL_DEBUG_OPEN
2224                 printk("block_til_ready blocking: ttys%d, count = %d\n",
2225                        info->line, info->count);
2226 #endif
2227                 schedule();
2228         }
2229         set_current_state(TASK_RUNNING);
2230         remove_wait_queue(&info->open_wait, &wait);
2231         if (!tty_hung_up_p(filp))
2232                 info->count++;
2233         info->blocked_open--;
2234 #ifdef SERIAL_DEBUG_OPEN
2235         printk("block_til_ready after blocking: ttys%d, count = %d\n",
2236                info->line, info->count);
2237 #endif
2238         if (retval)
2239                 return retval;
2240         info->flags |= ASYNC_NORMAL_ACTIVE;
2241         return 0;
2242 }
2243
2244 /*
2245  * This routine is called whenever a serial port is opened.  It
2246  * enables interrupts for a serial port, linking in its async structure into
2247  * the IRQ chain.   It also performs the serial-specific
2248  * initialization for the tty structure.
2249  */
2250 static int esp_open(struct tty_struct *tty, struct file * filp)
2251 {
2252         struct esp_struct       *info;
2253         int                     retval, line;
2254
2255         line = tty->index;
2256         if ((line < 0) || (line >= NR_PORTS))
2257                 return -ENODEV;
2258
2259         /* find the port in the chain */
2260
2261         info = ports;
2262
2263         while (info && (info->line != line))
2264                 info = info->next_port;
2265
2266         if (!info) {
2267                 serial_paranoia_check(info, tty->name, "esp_open");
2268                 return -ENODEV;
2269         }
2270
2271 #ifdef SERIAL_DEBUG_OPEN
2272         printk("esp_open %s, count = %d\n", tty->name, info->count);
2273 #endif
2274         info->count++;
2275         tty->driver_data = info;
2276         info->tty = tty;
2277
2278         if (!tmp_buf) {
2279                 tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
2280                 if (!tmp_buf)
2281                         return -ENOMEM;
2282         }
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         save_flags(flags); cli();
2339
2340         /*
2341          * Check for ESP card
2342          */
2343
2344         if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2345                 serial_out(info, UART_ESI_CMD1, 0x00);
2346                 serial_out(info, UART_ESI_CMD1, 0x01);
2347
2348                 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2349                         port_detected = 1;
2350
2351                         if (!(info->irq)) {
2352                                 serial_out(info, UART_ESI_CMD1, 0x02);
2353
2354                                 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2355                                         info->irq = 3;
2356                                 else
2357                                         info->irq = 4;
2358                         }
2359
2360
2361                         /* put card in enhanced mode */
2362                         /* this prevents access through */
2363                         /* the "old" IO ports */
2364                         esp_basic_init(info);
2365
2366                         /* clear out MCR */
2367                         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2368                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2369                         serial_out(info, UART_ESI_CMD2, 0x00);
2370                 }
2371         }
2372         if (!port_detected)
2373                 release_region(info->port, REGION_SIZE);
2374
2375         restore_flags(flags);
2376         return (port_detected);
2377 }
2378
2379 static struct tty_operations esp_ops = {
2380         .open = esp_open,
2381         .close = rs_close,
2382         .write = rs_write,
2383         .put_char = rs_put_char,
2384         .flush_chars = rs_flush_chars,
2385         .write_room = rs_write_room,
2386         .chars_in_buffer = rs_chars_in_buffer,
2387         .flush_buffer = rs_flush_buffer,
2388         .ioctl = rs_ioctl,
2389         .throttle = rs_throttle,
2390         .unthrottle = rs_unthrottle,
2391         .set_termios = rs_set_termios,
2392         .stop = rs_stop,
2393         .start = rs_start,
2394         .hangup = esp_hangup,
2395         .break_ctl = esp_break,
2396         .wait_until_sent = rs_wait_until_sent,
2397         .tiocmget = esp_tiocmget,
2398         .tiocmset = esp_tiocmset,
2399 };
2400
2401 /*
2402  * The serial driver boot-time initialization code!
2403  */
2404 static int __init espserial_init(void)
2405 {
2406         int i, offset;
2407         struct esp_struct * info;
2408         struct esp_struct *last_primary = NULL;
2409         int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2410
2411         esp_driver = alloc_tty_driver(NR_PORTS);
2412         if (!esp_driver)
2413                 return -ENOMEM;
2414
2415         for (i = 0; i < NR_PRIMARY; i++) {
2416                 if (irq[i] != 0) {
2417                         if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2418                             (irq[i] == 8) || (irq[i] == 13))
2419                                 irq[i] = 0;
2420                         else if (irq[i] == 2)
2421                                 irq[i] = 9;
2422                 }
2423         }
2424
2425         if ((dma != 1) && (dma != 3))
2426                 dma = 0;
2427
2428         if ((rx_trigger < 1) || (rx_trigger > 1023))
2429                 rx_trigger = 768;
2430
2431         if ((tx_trigger < 1) || (tx_trigger > 1023))
2432                 tx_trigger = 768;
2433
2434         if ((flow_off < 1) || (flow_off > 1023))
2435                 flow_off = 1016;
2436
2437         if ((flow_on < 1) || (flow_on > 1023))
2438                 flow_on = 944;
2439
2440         if ((rx_timeout < 0) || (rx_timeout > 255))
2441                 rx_timeout = 128;
2442
2443         if (flow_on >= flow_off)
2444                 flow_on = flow_off - 1;
2445
2446         show_serial_version();
2447
2448         /* Initialize the tty_driver structure */
2449
2450         esp_driver->owner = THIS_MODULE;
2451         esp_driver->name = "ttyP";
2452         esp_driver->devfs_name = "tts/P";
2453         esp_driver->major = ESP_IN_MAJOR;
2454         esp_driver->minor_start = 0;
2455         esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2456         esp_driver->subtype = SERIAL_TYPE_NORMAL;
2457         esp_driver->init_termios = tty_std_termios;
2458         esp_driver->init_termios.c_cflag =
2459                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2460         esp_driver->flags = TTY_DRIVER_REAL_RAW;
2461         tty_set_operations(esp_driver, &esp_ops);
2462         if (tty_register_driver(esp_driver))
2463         {
2464                 printk(KERN_ERR "Couldn't register esp serial driver");
2465                 put_tty_driver(esp_driver);
2466                 return 1;
2467         }
2468
2469         info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2470
2471         if (!info)
2472         {
2473                 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2474                 tty_unregister_driver(esp_driver);
2475                 put_tty_driver(esp_driver);
2476                 return 1;
2477         }
2478
2479         memset((void *)info, 0, sizeof(struct esp_struct));
2480         /* rx_trigger, tx_trigger are needed by autoconfig */
2481         info->config.rx_trigger = rx_trigger;
2482         info->config.tx_trigger = tx_trigger;
2483
2484         i = 0;
2485         offset = 0;
2486
2487         do {
2488                 info->port = esp[i] + offset;
2489                 info->irq = irq[i];
2490                 info->line = (i * 8) + (offset / 8);
2491
2492                 if (!autoconfig(info)) {
2493                         i++;
2494                         offset = 0;
2495                         continue;
2496                 }
2497
2498                 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2499                 info->flags = STD_COM_FLAGS;
2500                 if (info->custom_divisor)
2501                         info->flags |= ASYNC_SPD_CUST;
2502                 info->magic = ESP_MAGIC;
2503                 info->close_delay = 5*HZ/10;
2504                 info->closing_wait = 30*HZ;
2505                 INIT_WORK(&info->tqueue, do_softint, info);
2506                 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
2507                 info->config.rx_timeout = rx_timeout;
2508                 info->config.flow_on = flow_on;
2509                 info->config.flow_off = flow_off;
2510                 info->config.pio_threshold = pio_threshold;
2511                 info->next_port = ports;
2512                 init_waitqueue_head(&info->open_wait);
2513                 init_waitqueue_head(&info->close_wait);
2514                 init_waitqueue_head(&info->delta_msr_wait);
2515                 init_waitqueue_head(&info->break_wait);
2516                 ports = info;
2517                 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2518                         info->line, info->port, info->irq);
2519
2520                 if (info->line % 8) {
2521                         printk("secondary port\n");
2522                         /* 8 port cards can't do DMA */
2523                         info->stat_flags |= ESP_STAT_NEVER_DMA;
2524
2525                         if (last_primary)
2526                                 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2527                 } else {
2528                         printk("primary port\n");
2529                         last_primary = info;
2530                         irq[i] = info->irq;
2531                 }
2532
2533                 if (!dma)
2534                         info->stat_flags |= ESP_STAT_NEVER_DMA;
2535
2536                 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2537                 if (!info)
2538                 {
2539                         printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2540
2541                         /* allow use of the already detected ports */
2542                         return 0;
2543                 }
2544
2545                 memset((void *)info, 0, sizeof(struct esp_struct));
2546                 /* rx_trigger, tx_trigger are needed by autoconfig */
2547                 info->config.rx_trigger = rx_trigger;
2548                 info->config.tx_trigger = tx_trigger;
2549
2550                 if (offset == 56) {
2551                         i++;
2552                         offset = 0;
2553                 } else {
2554                         offset += 8;
2555                 }
2556         } while (i < NR_PRIMARY);
2557
2558         /* free the last port memory allocation */
2559         kfree(info);
2560
2561         return 0;
2562 }
2563
2564 static void __exit espserial_exit(void)
2565 {
2566         unsigned long flags;
2567         int e1;
2568         struct esp_struct *temp_async;
2569         struct esp_pio_buffer *pio_buf;
2570
2571         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2572         save_flags(flags);
2573         cli();
2574         if ((e1 = tty_unregister_driver(esp_driver)))
2575                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2576                        e1);
2577         restore_flags(flags);
2578         put_tty_driver(esp_driver);
2579
2580         while (ports) {
2581                 if (ports->port) {
2582                         release_region(ports->port, REGION_SIZE);
2583                 }
2584                 temp_async = ports->next_port;
2585                 kfree(ports);
2586                 ports = temp_async;
2587         }
2588
2589         if (dma_buffer)
2590                 free_pages((unsigned long)dma_buffer,
2591                         get_order(DMA_BUFFER_SZ));
2592
2593         if (tmp_buf)
2594                 free_page((unsigned long)tmp_buf);
2595
2596         while (free_pio_buf) {
2597                 pio_buf = free_pio_buf->next;
2598                 kfree(free_pio_buf);
2599                 free_pio_buf = pio_buf;
2600         }
2601 }
2602
2603 module_init(espserial_init);
2604 module_exit(espserial_exit);