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