93b5519625130362874ed36d48fc2f0fafe630f4
[linux-2.6.git] / drivers / char / esp.c
1 /*
2  *  esp.c - driver for Hayes ESP serial cards
3  *
4  *  --- Notices from serial.c, upon which this driver is based ---
5  *
6  *  Copyright (C) 1991, 1992  Linus Torvalds
7  *
8  *  Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92.  Now
9  *  much more extensible to support other serial cards based on the
10  *  16450/16550A UART's.  Added support for the AST FourPort and the
11  *  Accent Async board.  
12  *
13  *  set_serial_info fixed to set the flags, custom divisor, and uart
14  *      type fields.  Fix suggested by Michael K. Johnson 12/12/92.
15  *
16  *  11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
17  *
18  *  03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
19  *
20  *  rs_set_termios fixed to look also for changes of the input
21  *      flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
22  *                                            Bernd Anh�pl 05/17/96.
23  *
24  * --- End of notices from serial.c ---
25  *
26  * Support for the ESP serial card by Andrew J. Robinson
27  *     <arobinso@nyx.net> (Card detection routine taken from a patch
28  *     by Dennis J. Boylan).  Patches to allow use with 2.1.x contributed
29  *     by Chris Faylor.
30  *
31  * Most recent changes: (Andrew J. Robinson)
32  *   Support for PIO mode.  This allows the driver to work properly with
33  *     multiport cards.
34  *
35  * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
36  * several cleanups, use module_init/module_exit, etc
37  *
38  * This module exports the following rs232 io functions:
39  *
40  *      int espserial_init(void);
41  */
42
43 #include <linux/module.h>
44 #include <linux/errno.h>
45 #include <linux/signal.h>
46 #include <linux/sched.h>
47 #include <linux/interrupt.h>
48 #include <linux/tty.h>
49 #include <linux/tty_flip.h>
50 #include <linux/serial.h>
51 #include <linux/serialP.h>
52 #include <linux/serial_reg.h>
53 #include <linux/major.h>
54 #include <linux/string.h>
55 #include <linux/fcntl.h>
56 #include <linux/ptrace.h>
57 #include <linux/ioport.h>
58 #include <linux/mm.h>
59 #include <linux/init.h>
60 #include <linux/delay.h>
61
62 #include <asm/system.h>
63 #include <asm/io.h>
64 #include <asm/bitops.h>
65
66 #include <asm/dma.h>
67 #include <linux/slab.h>
68 #include <asm/uaccess.h>
69
70 #include <linux/hayesesp.h>
71
72 #define NR_PORTS 64     /* maximum number of ports */
73 #define NR_PRIMARY 8    /* maximum number of primary ports */
74 #define REGION_SIZE 8   /* size of io region to request */
75
76 /* The following variables can be set by giving module options */
77 static int irq[NR_PRIMARY];     /* IRQ for each base port */
78 static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
79 static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
80 static unsigned int rx_trigger = ESP_RX_TRIGGER;
81 static unsigned int tx_trigger = ESP_TX_TRIGGER;
82 static unsigned int flow_off = ESP_FLOW_OFF;
83 static unsigned int flow_on = ESP_FLOW_ON;
84 static unsigned int rx_timeout = ESP_RX_TMOUT;
85 static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
86
87 MODULE_LICENSE("GPL");
88
89 module_param_array(irq, int, NULL, 0);
90 module_param_array(divisor, uint, NULL, 0);
91 module_param(dma, uint, 0);
92 module_param(rx_trigger, uint, 0);
93 module_param(tx_trigger, uint, 0);
94 module_param(flow_off, uint, 0);
95 module_param(flow_on, uint, 0);
96 module_param(rx_timeout, uint, 0);
97 module_param(pio_threshold, uint, 0);
98
99 /* END */
100
101 static char *dma_buffer;
102 static int dma_bytes;
103 static struct esp_pio_buffer *free_pio_buf;
104
105 #define DMA_BUFFER_SZ 1024
106
107 #define WAKEUP_CHARS 1024
108
109 static char serial_name[] __initdata = "ESP serial driver";
110 static char serial_version[] __initdata = "2.2";
111
112 static struct tty_driver *esp_driver;
113
114 /* serial subtype definitions */
115 #define SERIAL_TYPE_NORMAL      1
116
117 /*
118  * Serial driver configuration section.  Here are the various options:
119  *
120  * SERIAL_PARANOIA_CHECK
121  *              Check the magic number for the esp_structure where
122  *              ever possible.
123  */
124
125 #undef SERIAL_PARANOIA_CHECK
126 #define SERIAL_DO_RESTART
127
128 #undef SERIAL_DEBUG_INTR
129 #undef SERIAL_DEBUG_OPEN
130 #undef SERIAL_DEBUG_FLOW
131
132 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
133 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
134  tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
135 #else
136 #define DBG_CNT(s)
137 #endif
138
139 static struct esp_struct *ports;
140
141 static void change_speed(struct esp_struct *info);
142 static void rs_wait_until_sent(struct tty_struct *, int);
143
144 /*
145  * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
146  * times the normal 1.8432 Mhz clock of most serial boards).
147  */
148 #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
149
150 /* Standard COM flags (except for COM4, because of the 8514 problem) */
151 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
152
153 static inline int serial_paranoia_check(struct esp_struct *info,
154                                         char *name, const char *routine)
155 {
156 #ifdef SERIAL_PARANOIA_CHECK
157         static const char badmagic[] = KERN_WARNING
158                 "Warning: bad magic number for serial struct (%s) in %s\n";
159         static const char badinfo[] = KERN_WARNING
160                 "Warning: null esp_struct for (%s) in %s\n";
161
162         if (!info) {
163                 printk(badinfo, name, routine);
164                 return 1;
165         }
166         if (info->magic != ESP_MAGIC) {
167                 printk(badmagic, name, routine);
168                 return 1;
169         }
170 #endif
171         return 0;
172 }
173
174 static inline unsigned int serial_in(struct esp_struct *info, int offset)
175 {
176         return inb(info->port + offset);
177 }
178
179 static inline void serial_out(struct esp_struct *info, int offset,
180                               unsigned char value)
181 {
182         outb(value, info->port+offset);
183 }
184
185 /*
186  * ------------------------------------------------------------
187  * rs_stop() and rs_start()
188  *
189  * This routines are called before setting or resetting tty->stopped.
190  * They enable or disable transmitter interrupts, as necessary.
191  * ------------------------------------------------------------
192  */
193 static void rs_stop(struct tty_struct *tty)
194 {
195         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
196         unsigned long flags;
197
198         if (serial_paranoia_check(info, tty->name, "rs_stop"))
199                 return;
200
201         spin_lock_irqsave(&info->lock, flags);
202         if (info->IER & UART_IER_THRI) {
203                 info->IER &= ~UART_IER_THRI;
204                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
205                 serial_out(info, UART_ESI_CMD2, info->IER);
206         }
207         spin_unlock_irqrestore(&info->lock, flags);
208 }
209
210 static void rs_start(struct tty_struct *tty)
211 {
212         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
213         unsigned long flags;
214         
215         if (serial_paranoia_check(info, tty->name, "rs_start"))
216                 return;
217         
218         spin_lock_irqsave(&info->lock, flags);
219         if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
220                 info->IER |= UART_IER_THRI;
221                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
222                 serial_out(info, UART_ESI_CMD2, info->IER);
223         }
224         spin_unlock_irqrestore(&info->lock, flags);
225 }
226
227 /*
228  * ----------------------------------------------------------------------
229  *
230  * Here starts the interrupt handling routines.  All of the following
231  * subroutines are declared as inline and are folded into
232  * rs_interrupt().  They were separated out for readability's sake.
233  *
234  * Note: rs_interrupt() is a "fast" interrupt, which means that it
235  * runs with interrupts turned off.  People who may want to modify
236  * rs_interrupt() should try to keep the interrupt handler as fast as
237  * possible.  After you are done making modifications, it is not a bad
238  * idea to do:
239  * 
240  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
241  *
242  * and look at the resulting assemble code in serial.s.
243  *
244  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
245  * -----------------------------------------------------------------------
246  */
247
248 /*
249  * This routine is used by the interrupt handler to schedule
250  * processing in the software interrupt portion of the driver.
251  */
252 static inline void rs_sched_event(struct esp_struct *info,
253                                   int event)
254 {
255         info->event |= 1 << event;
256         schedule_work(&info->tqueue);
257 }
258
259 static DEFINE_SPINLOCK(pio_lock);
260
261 static inline struct esp_pio_buffer *get_pio_buffer(void)
262 {
263         struct esp_pio_buffer *buf;
264         unsigned long flags;
265
266         spin_lock_irqsave(&pio_lock, flags);
267         if (free_pio_buf) {
268                 buf = free_pio_buf;
269                 free_pio_buf = buf->next;
270         } else {
271                 buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
272         }
273         spin_unlock_irqrestore(&pio_lock, flags);
274         return buf;
275 }
276
277 static inline void release_pio_buffer(struct esp_pio_buffer *buf)
278 {
279         unsigned long flags;
280         spin_lock_irqsave(&pio_lock, flags);
281         buf->next = free_pio_buf;
282         free_pio_buf = buf;
283         spin_unlock_irqrestore(&pio_lock, flags);
284 }
285
286 static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
287 {
288         struct tty_struct *tty = info->tty;
289         int i;
290         struct esp_pio_buffer *pio_buf;
291         struct esp_pio_buffer *err_buf;
292         unsigned char status_mask;
293
294         pio_buf = get_pio_buffer();
295
296         if (!pio_buf)
297                 return;
298
299         err_buf = get_pio_buffer();
300
301         if (!err_buf) {
302                 release_pio_buffer(pio_buf);
303                 return;
304         }
305
306         status_mask = (info->read_status_mask >> 2) & 0x07;
307                 
308         for (i = 0; i < num_bytes - 1; i += 2) {
309                 *((unsigned short *)(pio_buf->data + i)) =
310                         inw(info->port + UART_ESI_RX);
311                 err_buf->data[i] = serial_in(info, UART_ESI_RWS);
312                 err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
313                 err_buf->data[i] &= status_mask;
314         }
315
316         if (num_bytes & 0x0001) {
317                 pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
318                 err_buf->data[num_bytes - 1] =
319                         (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
320         }
321
322         /* make sure everything is still ok since interrupts were enabled */
323         tty = info->tty;
324
325         if (!tty) {
326                 release_pio_buffer(pio_buf);
327                 release_pio_buffer(err_buf);
328                 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
329                 return;
330         }
331
332         status_mask = (info->ignore_status_mask >> 2) & 0x07;
333
334         for (i = 0; i < num_bytes; i++) {
335                 if (!(err_buf->data[i] & status_mask)) {
336                         int flag = 0;
337
338                         if (err_buf->data[i] & 0x04) {
339                                 flag = TTY_BREAK;
340                                 if (info->flags & ASYNC_SAK)
341                                         do_SAK(tty);
342                         }
343                         else if (err_buf->data[i] & 0x02)
344                                 flag = TTY_FRAME;
345                         else if (err_buf->data[i] & 0x01)
346                                 flag = TTY_PARITY;
347                         tty_insert_flip_char(tty, pio_buf->data[i], flag);
348                 }
349         }
350
351         tty_schedule_flip(tty);
352
353         info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
354         release_pio_buffer(pio_buf);
355         release_pio_buffer(err_buf);
356 }
357
358 static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
359 {
360         unsigned long flags;
361         info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
362         dma_bytes = num_bytes;
363         info->stat_flags |= ESP_STAT_DMA_RX;
364         
365         flags=claim_dma_lock();
366         disable_dma(dma);
367         clear_dma_ff(dma);
368         set_dma_mode(dma, DMA_MODE_READ);
369         set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
370         set_dma_count(dma, dma_bytes);
371         enable_dma(dma);
372         release_dma_lock(flags);
373         
374         serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
375 }
376
377 static inline void receive_chars_dma_done(struct esp_struct *info,
378                                             int status)
379 {
380         struct tty_struct *tty = info->tty;
381         int num_bytes;
382         unsigned long flags;
383         
384         flags=claim_dma_lock();
385         disable_dma(dma);
386         clear_dma_ff(dma);
387
388         info->stat_flags &= ~ESP_STAT_DMA_RX;
389         num_bytes = dma_bytes - get_dma_residue(dma);
390         release_dma_lock(flags);
391         
392         info->icount.rx += num_bytes;
393
394         if (num_bytes > 0) {
395                 tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
396
397                 status &= (0x1c & info->read_status_mask);
398                 
399                 /* Is the status significant or do we throw the last byte ? */
400                 if (!(status & info->ignore_status_mask)) {
401                         int statflag = 0;
402
403                         if (status & 0x10) {
404                                 statflag = TTY_BREAK;
405                                 (info->icount.brk)++;
406                                 if (info->flags & ASYNC_SAK)
407                                         do_SAK(tty);
408                         } else if (status & 0x08) {
409                                 statflag = TTY_FRAME;
410                                 (info->icount.frame)++;
411                         }
412                         else if (status & 0x04) {
413                                 statflag = TTY_PARITY;
414                                 (info->icount.parity)++;
415                         }
416                         tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag);
417                 }
418                 tty_schedule_flip(tty);
419         }
420
421         if (dma_bytes != num_bytes) {
422                 num_bytes = dma_bytes - num_bytes;
423                 dma_bytes = 0;
424                 receive_chars_dma(info, num_bytes);
425         } else
426                 dma_bytes = 0;
427 }
428
429 /* Caller must hold info->lock */
430
431 static inline void transmit_chars_pio(struct esp_struct *info,
432                                         int space_avail)
433 {
434         int i;
435         struct esp_pio_buffer *pio_buf;
436
437         pio_buf = get_pio_buffer();
438
439         if (!pio_buf)
440                 return;
441
442         while (space_avail && info->xmit_cnt) {
443                 if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
444                         memcpy(pio_buf->data,
445                                &(info->xmit_buf[info->xmit_tail]),
446                                space_avail);
447                 } else {
448                         i = ESP_XMIT_SIZE - info->xmit_tail;
449                         memcpy(pio_buf->data,
450                                &(info->xmit_buf[info->xmit_tail]), i);
451                         memcpy(&(pio_buf->data[i]), info->xmit_buf,
452                                space_avail - i);
453                 }
454
455                 info->xmit_cnt -= space_avail;
456                 info->xmit_tail = (info->xmit_tail + space_avail) &
457                         (ESP_XMIT_SIZE - 1);
458
459                 for (i = 0; i < space_avail - 1; i += 2) {
460                         outw(*((unsigned short *)(pio_buf->data + i)),
461                              info->port + UART_ESI_TX);
462                 }
463
464                 if (space_avail & 0x0001)
465                         serial_out(info, UART_ESI_TX,
466                                    pio_buf->data[space_avail - 1]);
467
468                 if (info->xmit_cnt) {
469                         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
470                         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
471                         space_avail = serial_in(info, UART_ESI_STAT1) << 8;
472                         space_avail |= serial_in(info, UART_ESI_STAT2);
473
474                         if (space_avail > info->xmit_cnt)
475                                 space_avail = info->xmit_cnt;
476                 }
477         }
478
479         if (info->xmit_cnt < WAKEUP_CHARS) {
480                 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
481
482 #ifdef SERIAL_DEBUG_INTR
483                 printk("THRE...");
484 #endif
485
486                 if (info->xmit_cnt <= 0) {
487                         info->IER &= ~UART_IER_THRI;
488                         serial_out(info, UART_ESI_CMD1,
489                                    ESI_SET_SRV_MASK);
490                         serial_out(info, UART_ESI_CMD2, info->IER);
491                 }
492         }
493
494         release_pio_buffer(pio_buf);
495 }
496
497 /* Caller must hold info->lock */
498 static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
499 {
500         unsigned long flags;
501         
502         dma_bytes = num_bytes;
503
504         if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
505                 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
506                        dma_bytes);
507         } else {
508                 int i = ESP_XMIT_SIZE - info->xmit_tail;
509                 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
510                         i);
511                 memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
512         }
513
514         info->xmit_cnt -= dma_bytes;
515         info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
516
517         if (info->xmit_cnt < WAKEUP_CHARS) {
518                 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
519
520 #ifdef SERIAL_DEBUG_INTR
521                 printk("THRE...");
522 #endif
523
524                 if (info->xmit_cnt <= 0) {
525                         info->IER &= ~UART_IER_THRI;
526                         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
527                         serial_out(info, UART_ESI_CMD2, info->IER);
528                 }
529         }
530
531         info->stat_flags |= ESP_STAT_DMA_TX;
532         
533         flags=claim_dma_lock();
534         disable_dma(dma);
535         clear_dma_ff(dma);
536         set_dma_mode(dma, DMA_MODE_WRITE);
537         set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
538         set_dma_count(dma, dma_bytes);
539         enable_dma(dma);
540         release_dma_lock(flags);
541         
542         serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
543 }
544
545 static inline void transmit_chars_dma_done(struct esp_struct *info)
546 {
547         int num_bytes;
548         unsigned long flags;
549         
550
551         flags=claim_dma_lock();
552         disable_dma(dma);
553         clear_dma_ff(dma);
554
555         num_bytes = dma_bytes - get_dma_residue(dma);
556         info->icount.tx += dma_bytes;
557         release_dma_lock(flags);
558
559         if (dma_bytes != num_bytes) {
560                 dma_bytes -= num_bytes;
561                 memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
562                 
563                 flags=claim_dma_lock();
564                 disable_dma(dma);
565                 clear_dma_ff(dma);
566                 set_dma_mode(dma, DMA_MODE_WRITE);
567                 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
568                 set_dma_count(dma, dma_bytes);
569                 enable_dma(dma);
570                 release_dma_lock(flags);
571                 
572                 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
573         } else {
574                 dma_bytes = 0;
575                 info->stat_flags &= ~ESP_STAT_DMA_TX;
576         }
577 }
578
579 static inline void check_modem_status(struct esp_struct *info)
580 {
581         int     status;
582         
583         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
584         status = serial_in(info, UART_ESI_STAT2);
585
586         if (status & UART_MSR_ANY_DELTA) {
587                 /* update input line counters */
588                 if (status & UART_MSR_TERI)
589                         info->icount.rng++;
590                 if (status & UART_MSR_DDSR)
591                         info->icount.dsr++;
592                 if (status & UART_MSR_DDCD)
593                         info->icount.dcd++;
594                 if (status & UART_MSR_DCTS)
595                         info->icount.cts++;
596                 wake_up_interruptible(&info->delta_msr_wait);
597         }
598
599         if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
600 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
601                 printk("ttys%d CD now %s...", info->line,
602                        (status & UART_MSR_DCD) ? "on" : "off");
603 #endif          
604                 if (status & UART_MSR_DCD)
605                         wake_up_interruptible(&info->open_wait);
606                 else {
607 #ifdef SERIAL_DEBUG_OPEN
608                         printk("scheduling hangup...");
609 #endif
610                         schedule_work(&info->tqueue_hangup);
611                 }
612         }
613 }
614
615 /*
616  * This is the serial driver's interrupt routine
617  */
618 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
619 {
620         struct esp_struct * info;
621         unsigned err_status;
622         unsigned int scratch;
623
624 #ifdef SERIAL_DEBUG_INTR
625         printk("rs_interrupt_single(%d)...", irq);
626 #endif
627         info = (struct esp_struct *)dev_id;
628         err_status = 0;
629         scratch = serial_in(info, UART_ESI_SID);
630
631         spin_lock(&info->lock);
632         
633         if (!info->tty) {
634                 spin_unlock(&info->lock);
635                 return IRQ_NONE;
636         }
637
638         if (scratch & 0x04) { /* error */
639                 serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
640                 err_status = serial_in(info, UART_ESI_STAT1);
641                 serial_in(info, UART_ESI_STAT2);
642
643                 if (err_status & 0x01)
644                         info->stat_flags |= ESP_STAT_RX_TIMEOUT;
645
646                 if (err_status & 0x20) /* UART status */
647                         check_modem_status(info);
648
649                 if (err_status & 0x80) /* Start break */
650                         wake_up_interruptible(&info->break_wait);
651         }
652                 
653         if ((scratch & 0x88) || /* DMA completed or timed out */
654             (err_status & 0x1c) /* receive error */) {
655                 if (info->stat_flags & ESP_STAT_DMA_RX)
656                         receive_chars_dma_done(info, err_status);
657                 else if (info->stat_flags & ESP_STAT_DMA_TX)
658                         transmit_chars_dma_done(info);
659         }
660
661         if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
662             ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
663             (info->IER & UART_IER_RDI)) {
664                 int num_bytes;
665
666                 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
667                 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
668                 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
669                 num_bytes |= serial_in(info, UART_ESI_STAT2);
670
671                 num_bytes = tty_buffer_request_room(info->tty, num_bytes);
672
673                 if (num_bytes) {
674                         if (dma_bytes ||
675                             (info->stat_flags & ESP_STAT_USE_PIO) ||
676                             (num_bytes <= info->config.pio_threshold))
677                                 receive_chars_pio(info, num_bytes);
678                         else
679                                 receive_chars_dma(info, num_bytes);
680                 }
681         }
682         
683         if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
684             (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
685                 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
686                         info->IER &= ~UART_IER_THRI;
687                         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
688                         serial_out(info, UART_ESI_CMD2, info->IER);
689                 } else {
690                         int num_bytes;
691
692                         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
693                         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
694                         num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
695                         num_bytes |= serial_in(info, UART_ESI_STAT2);
696
697                         if (num_bytes > info->xmit_cnt)
698                                 num_bytes = info->xmit_cnt;
699
700                         if (num_bytes) {
701                                 if (dma_bytes ||
702                                     (info->stat_flags & ESP_STAT_USE_PIO) ||
703                                     (num_bytes <= info->config.pio_threshold))
704                                         transmit_chars_pio(info, num_bytes);
705                                 else
706                                         transmit_chars_dma(info, num_bytes);
707                         }
708                 }
709         }
710
711         info->last_active = jiffies;
712
713 #ifdef SERIAL_DEBUG_INTR
714         printk("end.\n");
715 #endif
716         spin_unlock(&info->lock);
717         return IRQ_HANDLED;
718 }
719
720 /*
721  * -------------------------------------------------------------------
722  * Here ends the serial interrupt routines.
723  * -------------------------------------------------------------------
724  */
725
726 static void do_softint(struct work_struct *work)
727 {
728         struct esp_struct       *info =
729                 container_of(work, struct esp_struct, tqueue);
730         struct tty_struct       *tty;
731         
732         tty = info->tty;
733         if (!tty)
734                 return;
735
736         if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
737                 tty_wakeup(tty);
738         }
739 }
740
741 /*
742  * This routine is called from the scheduler tqueue when the interrupt
743  * routine has signalled that a hangup has occurred.  The path of
744  * hangup processing is:
745  *
746  *      serial interrupt routine -> (scheduler tqueue) ->
747  *      do_serial_hangup() -> tty->hangup() -> esp_hangup()
748  * 
749  */
750 static void do_serial_hangup(struct work_struct *work)
751 {
752         struct esp_struct       *info =
753                 container_of(work, struct esp_struct, tqueue_hangup);
754         struct tty_struct       *tty;
755         
756         tty = info->tty;
757         if (tty)
758                 tty_hangup(tty);
759 }
760
761 /*
762  * ---------------------------------------------------------------
763  * Low level utility subroutines for the serial driver:  routines to
764  * figure out the appropriate timeout for an interrupt chain, routines
765  * to initialize and startup a serial port, and routines to shutdown a
766  * serial port.  Useful stuff like that.
767  *
768  * Caller should hold lock
769  * ---------------------------------------------------------------
770  */
771
772 static inline void esp_basic_init(struct esp_struct * info)
773 {
774         /* put ESPC in enhanced mode */
775         serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
776         
777         if (info->stat_flags & ESP_STAT_NEVER_DMA)
778                 serial_out(info, UART_ESI_CMD2, 0x01);
779         else
780                 serial_out(info, UART_ESI_CMD2, 0x31);
781
782         /* disable interrupts for now */
783         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
784         serial_out(info, UART_ESI_CMD2, 0x00);
785
786         /* set interrupt and DMA channel */
787         serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
788
789         if (info->stat_flags & ESP_STAT_NEVER_DMA)
790                 serial_out(info, UART_ESI_CMD2, 0x01);
791         else
792                 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
793
794         serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
795
796         if (info->line % 8)     /* secondary port */
797                 serial_out(info, UART_ESI_CMD2, 0x0d);  /* shared */
798         else if (info->irq == 9)
799                 serial_out(info, UART_ESI_CMD2, 0x02);
800         else
801                 serial_out(info, UART_ESI_CMD2, info->irq);
802
803         /* set error status mask (check this) */
804         serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
805
806         if (info->stat_flags & ESP_STAT_NEVER_DMA)
807                 serial_out(info, UART_ESI_CMD2, 0xa1);
808         else
809                 serial_out(info, UART_ESI_CMD2, 0xbd);
810
811         serial_out(info, UART_ESI_CMD2, 0x00);
812
813         /* set DMA timeout */
814         serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
815         serial_out(info, UART_ESI_CMD2, 0xff);
816
817         /* set FIFO trigger levels */
818         serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
819         serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
820         serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
821         serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
822         serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
823
824         /* Set clock scaling and wait states */
825         serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
826         serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
827
828         /* set reinterrupt pacing */
829         serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
830         serial_out(info, UART_ESI_CMD2, 0xff);
831 }
832
833 static int startup(struct esp_struct * info)
834 {
835         unsigned long flags;
836         int     retval=0;
837         unsigned int num_chars;
838
839         spin_lock_irqsave(&info->lock, flags);
840
841         if (info->flags & ASYNC_INITIALIZED)
842                 goto out;
843
844         if (!info->xmit_buf) {
845                 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
846                 retval = -ENOMEM;
847                 if (!info->xmit_buf)
848                         goto out;
849         }
850
851 #ifdef SERIAL_DEBUG_OPEN
852         printk("starting up ttys%d (irq %d)...", info->line, info->irq);
853 #endif
854
855         /* Flush the RX buffer.  Using the ESI flush command may cause */
856         /* wild interrupts, so read all the data instead. */
857
858         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
859         serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
860         num_chars = serial_in(info, UART_ESI_STAT1) << 8;
861         num_chars |= serial_in(info, UART_ESI_STAT2);
862
863         while (num_chars > 1) {
864                 inw(info->port + UART_ESI_RX);
865                 num_chars -= 2;
866         }
867
868         if (num_chars)
869                 serial_in(info, UART_ESI_RX);
870
871         /* set receive character timeout */
872         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
873         serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
874
875         /* clear all flags except the "never DMA" flag */
876         info->stat_flags &= ESP_STAT_NEVER_DMA;
877
878         if (info->stat_flags & ESP_STAT_NEVER_DMA)
879                 info->stat_flags |= ESP_STAT_USE_PIO;
880
881         spin_unlock_irqrestore(&info->lock, flags);
882
883         /*
884          * Allocate the IRQ
885          */
886
887         retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
888                              "esp serial", info);
889
890         if (retval) {
891                 if (capable(CAP_SYS_ADMIN)) {
892                         if (info->tty)
893                                 set_bit(TTY_IO_ERROR,
894                                         &info->tty->flags);
895                         retval = 0;
896                 }
897                 goto out_unlocked;
898         }
899
900         if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
901                 dma_buffer = (char *)__get_dma_pages(
902                         GFP_KERNEL, get_order(DMA_BUFFER_SZ));
903
904                 /* use PIO mode if DMA buf/chan cannot be allocated */
905                 if (!dma_buffer)
906                         info->stat_flags |= ESP_STAT_USE_PIO;
907                 else if (request_dma(dma, "esp serial")) {
908                         free_pages((unsigned long)dma_buffer,
909                                    get_order(DMA_BUFFER_SZ));
910                         dma_buffer = NULL;
911                         info->stat_flags |= ESP_STAT_USE_PIO;
912                 }
913                         
914         }
915
916         info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
917
918         spin_lock_irqsave(&info->lock, flags);
919         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
920         serial_out(info, UART_ESI_CMD2, UART_MCR);
921         serial_out(info, UART_ESI_CMD2, info->MCR);
922         
923         /*
924          * Finally, enable interrupts
925          */
926         /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
927         info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
928                         UART_IER_DMA_TC;
929         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
930         serial_out(info, UART_ESI_CMD2, info->IER);
931         
932         if (info->tty)
933                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
934         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
935         spin_unlock_irqrestore(&info->lock, flags);
936
937         /*
938          * Set up the tty->alt_speed kludge
939          */
940         if (info->tty) {
941                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
942                         info->tty->alt_speed = 57600;
943                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
944                         info->tty->alt_speed = 115200;
945                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
946                         info->tty->alt_speed = 230400;
947                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
948                         info->tty->alt_speed = 460800;
949         }
950         
951         /*
952          * set the speed of the serial port
953          */
954         change_speed(info);
955         info->flags |= ASYNC_INITIALIZED;
956         return 0;
957
958 out:
959         spin_unlock_irqrestore(&info->lock, flags);
960 out_unlocked:
961         return retval;
962 }
963
964 /*
965  * This routine will shutdown a serial port; interrupts are disabled, and
966  * DTR is dropped if the hangup on close termio flag is on.
967  */
968 static void shutdown(struct esp_struct * info)
969 {
970         unsigned long   flags, f;
971
972         if (!(info->flags & ASYNC_INITIALIZED))
973                 return;
974
975 #ifdef SERIAL_DEBUG_OPEN
976         printk("Shutting down serial port %d (irq %d)....", info->line,
977                info->irq);
978 #endif
979         
980         spin_lock_irqsave(&info->lock, flags);
981         /*
982          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
983          * here so the queue might never be waken up
984          */
985         wake_up_interruptible(&info->delta_msr_wait);
986         wake_up_interruptible(&info->break_wait);
987
988         /* stop a DMA transfer on the port being closed */
989         /* DMA lock is higher priority always */
990         if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
991                 f=claim_dma_lock();
992                 disable_dma(dma);
993                 clear_dma_ff(dma);
994                 release_dma_lock(f);
995                 
996                 dma_bytes = 0;
997         }
998         
999         /*
1000          * Free the IRQ
1001          */
1002         free_irq(info->irq, info);
1003
1004         if (dma_buffer) {
1005                 struct esp_struct *current_port = ports;
1006
1007                 while (current_port) {
1008                         if ((current_port != info) &&
1009                             (current_port->flags & ASYNC_INITIALIZED))
1010                                 break;
1011
1012                         current_port = current_port->next_port;
1013                 }
1014
1015                 if (!current_port) {
1016                         free_dma(dma);
1017                         free_pages((unsigned long)dma_buffer,
1018                                    get_order(DMA_BUFFER_SZ));
1019                         dma_buffer = NULL;
1020                 }               
1021         }
1022
1023         if (info->xmit_buf) {
1024                 free_page((unsigned long) info->xmit_buf);
1025                 info->xmit_buf = NULL;
1026         }
1027
1028         info->IER = 0;
1029         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1030         serial_out(info, UART_ESI_CMD2, 0x00);
1031
1032         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1033                 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1034
1035         info->MCR &= ~UART_MCR_OUT2;
1036         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1037         serial_out(info, UART_ESI_CMD2, UART_MCR);
1038         serial_out(info, UART_ESI_CMD2, info->MCR);
1039
1040         if (info->tty)
1041                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1042         
1043         info->flags &= ~ASYNC_INITIALIZED;
1044         spin_unlock_irqrestore(&info->lock, flags);
1045 }
1046
1047 /*
1048  * This routine is called to set the UART divisor registers to match
1049  * the specified baud rate for a serial port.
1050  */
1051 static void change_speed(struct esp_struct *info)
1052 {
1053         unsigned short port;
1054         int     quot = 0;
1055         unsigned cflag,cval;
1056         int     baud, bits;
1057         unsigned char flow1 = 0, flow2 = 0;
1058         unsigned long flags;
1059
1060         if (!info->tty || !info->tty->termios)
1061                 return;
1062         cflag = info->tty->termios->c_cflag;
1063         port = info->port;
1064         
1065         /* byte size and parity */
1066         switch (cflag & CSIZE) {
1067               case CS5: cval = 0x00; bits = 7; break;
1068               case CS6: cval = 0x01; bits = 8; break;
1069               case CS7: cval = 0x02; bits = 9; break;
1070               case CS8: cval = 0x03; bits = 10; break;
1071               default:  cval = 0x00; bits = 7; break;
1072         }
1073         if (cflag & CSTOPB) {
1074                 cval |= 0x04;
1075                 bits++;
1076         }
1077         if (cflag & PARENB) {
1078                 cval |= UART_LCR_PARITY;
1079                 bits++;
1080         }
1081         if (!(cflag & PARODD))
1082                 cval |= UART_LCR_EPAR;
1083 #ifdef CMSPAR
1084         if (cflag & CMSPAR)
1085                 cval |= UART_LCR_SPAR;
1086 #endif
1087
1088         baud = tty_get_baud_rate(info->tty);
1089         if (baud == 38400 &&
1090             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1091                 quot = info->custom_divisor;
1092         else {
1093                 if (baud == 134)
1094                         /* Special case since 134 is really 134.5 */
1095                         quot = (2*BASE_BAUD / 269);
1096                 else if (baud)
1097                         quot = BASE_BAUD / baud;
1098         }
1099         /* If the quotient is ever zero, default to 9600 bps */
1100         if (!quot)
1101                 quot = BASE_BAUD / 9600;
1102         
1103         info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1104
1105         /* CTS flow control flag and modem status interrupts */
1106         /* info->IER &= ~UART_IER_MSI; */
1107         if (cflag & CRTSCTS) {
1108                 info->flags |= ASYNC_CTS_FLOW;
1109                 /* info->IER |= UART_IER_MSI; */
1110                 flow1 = 0x04;
1111                 flow2 = 0x10;
1112         } else
1113                 info->flags &= ~ASYNC_CTS_FLOW;
1114         if (cflag & CLOCAL)
1115                 info->flags &= ~ASYNC_CHECK_CD;
1116         else {
1117                 info->flags |= ASYNC_CHECK_CD;
1118                 /* info->IER |= UART_IER_MSI; */
1119         }
1120
1121         /*
1122          * Set up parity check flag
1123          */
1124 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1125
1126         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1127         if (I_INPCK(info->tty))
1128                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1129         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1130                 info->read_status_mask |= UART_LSR_BI;
1131         
1132         info->ignore_status_mask = 0;
1133 #if 0
1134         /* This should be safe, but for some broken bits of hardware... */
1135         if (I_IGNPAR(info->tty)) {
1136                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1137                 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1138         }
1139 #endif
1140         if (I_IGNBRK(info->tty)) {
1141                 info->ignore_status_mask |= UART_LSR_BI;
1142                 info->read_status_mask |= UART_LSR_BI;
1143                 /*
1144                  * If we're ignore parity and break indicators, ignore 
1145                  * overruns too.  (For real raw support).
1146                  */
1147                 if (I_IGNPAR(info->tty)) {
1148                         info->ignore_status_mask |= UART_LSR_OE | \
1149                                 UART_LSR_PE | UART_LSR_FE;
1150                         info->read_status_mask |= UART_LSR_OE | \
1151                                 UART_LSR_PE | UART_LSR_FE;
1152                 }
1153         }
1154
1155         if (I_IXOFF(info->tty))
1156                 flow1 |= 0x81;
1157
1158         spin_lock_irqsave(&info->lock, flags);
1159         /* set baud */
1160         serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1161         serial_out(info, UART_ESI_CMD2, quot >> 8);
1162         serial_out(info, UART_ESI_CMD2, quot & 0xff);
1163
1164         /* set data bits, parity, etc. */
1165         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1166         serial_out(info, UART_ESI_CMD2, UART_LCR);
1167         serial_out(info, UART_ESI_CMD2, cval);
1168
1169         /* Enable flow control */
1170         serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1171         serial_out(info, UART_ESI_CMD2, flow1);
1172         serial_out(info, UART_ESI_CMD2, flow2);
1173
1174         /* set flow control characters (XON/XOFF only) */
1175         if (I_IXOFF(info->tty)) {
1176                 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1177                 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1178                 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1179                 serial_out(info, UART_ESI_CMD2, 0x10);
1180                 serial_out(info, UART_ESI_CMD2, 0x21);
1181                 switch (cflag & CSIZE) {
1182                         case CS5:
1183                                 serial_out(info, UART_ESI_CMD2, 0x1f);
1184                                 break;
1185                         case CS6:
1186                                 serial_out(info, UART_ESI_CMD2, 0x3f);
1187                                 break;
1188                         case CS7:
1189                         case CS8:
1190                                 serial_out(info, UART_ESI_CMD2, 0x7f);
1191                                 break;
1192                         default:
1193                                 serial_out(info, UART_ESI_CMD2, 0xff);
1194                                 break;
1195                 }
1196         }
1197
1198         /* Set high/low water */
1199         serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1200         serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1201         serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1202         serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1203         serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1204
1205         spin_unlock_irqrestore(&info->lock, flags);
1206 }
1207
1208 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1209 {
1210         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1211         unsigned long flags;
1212
1213         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1214                 return;
1215
1216         if (!info->xmit_buf)
1217                 return;
1218
1219         spin_lock_irqsave(&info->lock, flags);
1220         if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
1221                 info->xmit_buf[info->xmit_head++] = ch;
1222                 info->xmit_head &= ESP_XMIT_SIZE-1;
1223                 info->xmit_cnt++;
1224         }
1225         spin_unlock_irqrestore(&info->lock, flags);
1226 }
1227
1228 static void rs_flush_chars(struct tty_struct *tty)
1229 {
1230         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1231         unsigned long flags;
1232                                 
1233         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1234                 return;
1235
1236         spin_lock_irqsave(&info->lock, flags);
1237
1238         if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1239                 goto out;
1240
1241         if (!(info->IER & UART_IER_THRI)) {
1242                 info->IER |= UART_IER_THRI;
1243                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1244                 serial_out(info, UART_ESI_CMD2, info->IER);
1245         }
1246 out:
1247         spin_unlock_irqrestore(&info->lock, flags);
1248 }
1249
1250 static int rs_write(struct tty_struct * tty,
1251                     const unsigned char *buf, int count)
1252 {
1253         int     c, t, ret = 0;
1254         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1255         unsigned long flags;
1256
1257         if (serial_paranoia_check(info, tty->name, "rs_write"))
1258                 return 0;
1259
1260         if (!info->xmit_buf)
1261                 return 0;
1262             
1263         while (1) {
1264                 /* Thanks to R. Wolff for suggesting how to do this with */
1265                 /* interrupts enabled */
1266
1267                 c = count;
1268                 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1269                 
1270                 if (t < c)
1271                         c = t;
1272
1273                 t = ESP_XMIT_SIZE - info->xmit_head;
1274                 
1275                 if (t < c)
1276                         c = t;
1277
1278                 if (c <= 0)
1279                         break;
1280
1281                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1282
1283                 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1284                 info->xmit_cnt += c;
1285                 buf += c;
1286                 count -= c;
1287                 ret += c;
1288         }
1289
1290         spin_lock_irqsave(&info->lock, flags);
1291
1292         if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1293                 info->IER |= UART_IER_THRI;
1294                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1295                 serial_out(info, UART_ESI_CMD2, info->IER);
1296         }
1297
1298         spin_unlock_irqrestore(&info->lock, flags);
1299         return ret;
1300 }
1301
1302 static int rs_write_room(struct tty_struct *tty)
1303 {
1304         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1305         int     ret;
1306         unsigned long flags;
1307                                 
1308         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1309                 return 0;
1310
1311         spin_lock_irqsave(&info->lock, flags);
1312
1313         ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1314         if (ret < 0)
1315                 ret = 0;
1316         spin_unlock_irqrestore(&info->lock, flags);
1317         return ret;
1318 }
1319
1320 static int rs_chars_in_buffer(struct tty_struct *tty)
1321 {
1322         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1323                                 
1324         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1325                 return 0;
1326         return info->xmit_cnt;
1327 }
1328
1329 static void rs_flush_buffer(struct tty_struct *tty)
1330 {
1331         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1332         unsigned long flags;
1333                                 
1334         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1335                 return;
1336         spin_lock_irqsave(&info->lock, flags);
1337         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1338         spin_unlock_irqrestore(&info->lock, flags);
1339         tty_wakeup(tty);
1340 }
1341
1342 /*
1343  * ------------------------------------------------------------
1344  * rs_throttle()
1345  * 
1346  * This routine is called by the upper-layer tty layer to signal that
1347  * incoming characters should be throttled.
1348  * ------------------------------------------------------------
1349  */
1350 static void rs_throttle(struct tty_struct * tty)
1351 {
1352         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1353         unsigned long flags;
1354 #ifdef SERIAL_DEBUG_THROTTLE
1355         char    buf[64];
1356         
1357         printk("throttle %s: %d....\n", tty_name(tty, buf),
1358                tty->ldisc.chars_in_buffer(tty));
1359 #endif
1360
1361         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1362                 return;
1363
1364         spin_lock_irqsave(&info->lock, flags);
1365         info->IER &= ~UART_IER_RDI;
1366         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1367         serial_out(info, UART_ESI_CMD2, info->IER);
1368         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1369         serial_out(info, UART_ESI_CMD2, 0x00);
1370         spin_unlock_irqrestore(&info->lock, flags);
1371 }
1372
1373 static void rs_unthrottle(struct tty_struct * tty)
1374 {
1375         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1376         unsigned long flags;
1377 #ifdef SERIAL_DEBUG_THROTTLE
1378         char    buf[64];
1379         
1380         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1381                tty->ldisc.chars_in_buffer(tty));
1382 #endif
1383
1384         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1385                 return;
1386         
1387         spin_lock_irqsave(&info->lock, flags);
1388         info->IER |= UART_IER_RDI;
1389         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1390         serial_out(info, UART_ESI_CMD2, info->IER);
1391         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1392         serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1393         spin_unlock_irqrestore(&info->lock, flags);
1394 }
1395
1396 /*
1397  * ------------------------------------------------------------
1398  * rs_ioctl() and friends
1399  * ------------------------------------------------------------
1400  */
1401
1402 static int get_serial_info(struct esp_struct * info,
1403                            struct serial_struct __user *retinfo)
1404 {
1405         struct serial_struct tmp;
1406   
1407         memset(&tmp, 0, sizeof(tmp));
1408         tmp.type = PORT_16550A;
1409         tmp.line = info->line;
1410         tmp.port = info->port;
1411         tmp.irq = info->irq;
1412         tmp.flags = info->flags;
1413         tmp.xmit_fifo_size = 1024;
1414         tmp.baud_base = BASE_BAUD;
1415         tmp.close_delay = info->close_delay;
1416         tmp.closing_wait = info->closing_wait;
1417         tmp.custom_divisor = info->custom_divisor;
1418         tmp.hub6 = 0;
1419         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1420                 return -EFAULT;
1421         return 0;
1422 }
1423
1424 static int get_esp_config(struct esp_struct * info,
1425                           struct hayes_esp_config __user *retinfo)
1426 {
1427         struct hayes_esp_config tmp;
1428   
1429         if (!retinfo)
1430                 return -EFAULT;
1431
1432         memset(&tmp, 0, sizeof(tmp));
1433         tmp.rx_timeout = info->config.rx_timeout;
1434         tmp.rx_trigger = info->config.rx_trigger;
1435         tmp.tx_trigger = info->config.tx_trigger;
1436         tmp.flow_off = info->config.flow_off;
1437         tmp.flow_on = info->config.flow_on;
1438         tmp.pio_threshold = info->config.pio_threshold;
1439         tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1440
1441         return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1442 }
1443
1444 static int set_serial_info(struct esp_struct * info,
1445                            struct serial_struct __user *new_info)
1446 {
1447         struct serial_struct new_serial;
1448         struct esp_struct old_info;
1449         unsigned int change_irq;
1450         int retval = 0;
1451         struct esp_struct *current_async;
1452
1453         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1454                 return -EFAULT;
1455         old_info = *info;
1456
1457         if ((new_serial.type != PORT_16550A) ||
1458             (new_serial.hub6) ||
1459             (info->port != new_serial.port) ||
1460             (new_serial.baud_base != BASE_BAUD) ||
1461             (new_serial.irq > 15) ||
1462             (new_serial.irq < 2) ||
1463             (new_serial.irq == 6) ||
1464             (new_serial.irq == 8) ||
1465             (new_serial.irq == 13))
1466                 return -EINVAL;
1467
1468         change_irq = new_serial.irq != info->irq;
1469
1470         if (change_irq && (info->line % 8))
1471                 return -EINVAL;
1472
1473         if (!capable(CAP_SYS_ADMIN)) {
1474                 if (change_irq || 
1475                     (new_serial.close_delay != info->close_delay) ||
1476                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1477                      (info->flags & ~ASYNC_USR_MASK)))
1478                         return -EPERM;
1479                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1480                                (new_serial.flags & ASYNC_USR_MASK));
1481                 info->custom_divisor = new_serial.custom_divisor;
1482         } else {
1483                 if (new_serial.irq == 2)
1484                         new_serial.irq = 9;
1485
1486                 if (change_irq) {
1487                         current_async = ports;
1488
1489                         while (current_async) {
1490                                 if ((current_async->line >= info->line) &&
1491                                     (current_async->line < (info->line + 8))) {
1492                                         if (current_async == info) {
1493                                                 if (current_async->count > 1)
1494                                                         return -EBUSY;
1495                                         } else if (current_async->count)
1496                                                 return -EBUSY;
1497                                 }
1498
1499                                 current_async = current_async->next_port;
1500                         }
1501                 }
1502
1503                 /*
1504                  * OK, past this point, all the error checking has been done.
1505                  * At this point, we start making changes.....
1506                  */
1507
1508                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1509                                (new_serial.flags & ASYNC_FLAGS));
1510                 info->custom_divisor = new_serial.custom_divisor;
1511                 info->close_delay = new_serial.close_delay * HZ/100;
1512                 info->closing_wait = new_serial.closing_wait * HZ/100;
1513
1514                 if (change_irq) {
1515                         /*
1516                          * We need to shutdown the serial port at the old
1517                          * port/irq combination.
1518                          */
1519                         shutdown(info);
1520
1521                         current_async = ports;
1522
1523                         while (current_async) {
1524                                 if ((current_async->line >= info->line) &&
1525                                     (current_async->line < (info->line + 8)))
1526                                         current_async->irq = new_serial.irq;
1527
1528                                 current_async = current_async->next_port;
1529                         }
1530
1531                         serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1532                         if (info->irq == 9)
1533                                 serial_out(info, UART_ESI_CMD2, 0x02);
1534                         else
1535                                 serial_out(info, UART_ESI_CMD2, info->irq);
1536                 }
1537         }
1538
1539         if (info->flags & ASYNC_INITIALIZED) {
1540                 if (((old_info.flags & ASYNC_SPD_MASK) !=
1541                      (info->flags & ASYNC_SPD_MASK)) ||
1542                     (old_info.custom_divisor != info->custom_divisor)) {
1543                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1544                                 info->tty->alt_speed = 57600;
1545                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1546                                 info->tty->alt_speed = 115200;
1547                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1548                                 info->tty->alt_speed = 230400;
1549                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1550                                 info->tty->alt_speed = 460800;
1551                         change_speed(info);
1552                 }
1553         } else
1554                 retval = startup(info);
1555
1556         return retval;
1557 }
1558
1559 static int set_esp_config(struct esp_struct * info,
1560                           struct hayes_esp_config __user * new_info)
1561 {
1562         struct hayes_esp_config new_config;
1563         unsigned int change_dma;
1564         int retval = 0;
1565         struct esp_struct *current_async;
1566         unsigned long flags;
1567
1568         /* Perhaps a non-sysadmin user should be able to do some of these */
1569         /* operations.  I haven't decided yet. */
1570
1571         if (!capable(CAP_SYS_ADMIN))
1572                 return -EPERM;
1573
1574         if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1575                 return -EFAULT;
1576
1577         if ((new_config.flow_on >= new_config.flow_off) ||
1578             (new_config.rx_trigger < 1) ||
1579             (new_config.tx_trigger < 1) ||
1580             (new_config.flow_off < 1) ||
1581             (new_config.flow_on < 1) ||
1582             (new_config.rx_trigger > 1023) ||
1583             (new_config.tx_trigger > 1023) ||
1584             (new_config.flow_off > 1023) ||
1585             (new_config.flow_on > 1023) ||
1586             (new_config.pio_threshold < 0) ||
1587             (new_config.pio_threshold > 1024))
1588                 return -EINVAL;
1589
1590         if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1591                 new_config.dma_channel = 0;
1592
1593         if (info->stat_flags & ESP_STAT_NEVER_DMA)
1594                 change_dma = new_config.dma_channel;
1595         else
1596                 change_dma = (new_config.dma_channel != dma);
1597
1598         if (change_dma) {
1599                 if (new_config.dma_channel) {
1600                         /* PIO mode to DMA mode transition OR */
1601                         /* change current DMA channel */
1602                         
1603                         current_async = ports;
1604
1605                         while (current_async) {
1606                                 if (current_async == info) {
1607                                         if (current_async->count > 1)
1608                                                 return -EBUSY;
1609                                 } else if (current_async->count)
1610                                         return -EBUSY;
1611                                         
1612                                 current_async =
1613                                         current_async->next_port;
1614                         }
1615
1616                         shutdown(info);
1617                         dma = new_config.dma_channel;
1618                         info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1619                         
1620                         /* all ports must use the same DMA channel */
1621
1622                         spin_lock_irqsave(&info->lock, flags);
1623                         current_async = ports;
1624
1625                         while (current_async) {
1626                                 esp_basic_init(current_async);
1627                                 current_async = current_async->next_port;
1628                         }
1629                         spin_unlock_irqrestore(&info->lock, flags);
1630                 } else {
1631                         /* DMA mode to PIO mode only */
1632                         
1633                         if (info->count > 1)
1634                                 return -EBUSY;
1635
1636                         shutdown(info);
1637                         spin_lock_irqsave(&info->lock, flags);
1638                         info->stat_flags |= ESP_STAT_NEVER_DMA;
1639                         esp_basic_init(info);
1640                         spin_unlock_irqrestore(&info->lock, flags);
1641                 }
1642         }
1643
1644         info->config.pio_threshold = new_config.pio_threshold;
1645
1646         if ((new_config.flow_off != info->config.flow_off) ||
1647             (new_config.flow_on != info->config.flow_on)) {
1648                 unsigned long flags;
1649
1650                 info->config.flow_off = new_config.flow_off;
1651                 info->config.flow_on = new_config.flow_on;
1652
1653                 spin_lock_irqsave(&info->lock, flags);
1654                 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1655                 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1656                 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1657                 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1658                 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1659                 spin_unlock_irqrestore(&info->lock, flags);
1660         }
1661
1662         if ((new_config.rx_trigger != info->config.rx_trigger) ||
1663             (new_config.tx_trigger != info->config.tx_trigger)) {
1664                 unsigned long flags;
1665
1666                 info->config.rx_trigger = new_config.rx_trigger;
1667                 info->config.tx_trigger = new_config.tx_trigger;
1668                 spin_lock_irqsave(&info->lock, flags);
1669                 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1670                 serial_out(info, UART_ESI_CMD2,
1671                            new_config.rx_trigger >> 8);
1672                 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1673                 serial_out(info, UART_ESI_CMD2,
1674                            new_config.tx_trigger >> 8);
1675                 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1676                 spin_unlock_irqrestore(&info->lock, flags);
1677         }
1678
1679         if (new_config.rx_timeout != info->config.rx_timeout) {
1680                 unsigned long flags;
1681
1682                 info->config.rx_timeout = new_config.rx_timeout;
1683                 spin_lock_irqsave(&info->lock, flags);
1684
1685                 if (info->IER & UART_IER_RDI) {
1686                         serial_out(info, UART_ESI_CMD1,
1687                                    ESI_SET_RX_TIMEOUT);
1688                         serial_out(info, UART_ESI_CMD2,
1689                                    new_config.rx_timeout);
1690                 }
1691
1692                 spin_unlock_irqrestore(&info->lock, flags);
1693         }
1694
1695         if (!(info->flags & ASYNC_INITIALIZED))
1696                 retval = startup(info);
1697
1698         return retval;
1699 }
1700
1701 /*
1702  * get_lsr_info - get line status register info
1703  *
1704  * Purpose: Let user call ioctl() to get info when the UART physically
1705  *          is emptied.  On bus types like RS485, the transmitter must
1706  *          release the bus after transmitting. This must be done when
1707  *          the transmit shift register is empty, not be done when the
1708  *          transmit holding register is empty.  This functionality
1709  *          allows an RS485 driver to be written in user space. 
1710  */
1711 static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1712 {
1713         unsigned char status;
1714         unsigned int result;
1715         unsigned long flags;
1716
1717         spin_lock_irqsave(&info->lock, flags);
1718         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1719         status = serial_in(info, UART_ESI_STAT1);
1720         spin_unlock_irqrestore(&info->lock, flags);
1721         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1722         return put_user(result,value);
1723 }
1724
1725
1726 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1727 {
1728         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1729         unsigned char control, status;
1730         unsigned long flags;
1731
1732         if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1733                 return -ENODEV;
1734         if (tty->flags & (1 << TTY_IO_ERROR))
1735                 return -EIO;
1736
1737         control = info->MCR;
1738
1739         spin_lock_irqsave(&info->lock, flags);
1740         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1741         status = serial_in(info, UART_ESI_STAT2);
1742         spin_unlock_irqrestore(&info->lock, flags);
1743
1744         return    ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1745                 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1746                 | ((status  & UART_MSR_DCD) ? TIOCM_CAR : 0)
1747                 | ((status  & UART_MSR_RI) ? TIOCM_RNG : 0)
1748                 | ((status  & UART_MSR_DSR) ? TIOCM_DSR : 0)
1749                 | ((status  & UART_MSR_CTS) ? TIOCM_CTS : 0);
1750 }
1751
1752 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1753                         unsigned int set, unsigned int clear)
1754 {
1755         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1756         unsigned long flags;
1757
1758         if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1759                 return -ENODEV;
1760         if (tty->flags & (1 << TTY_IO_ERROR))
1761                 return -EIO;
1762
1763         spin_lock_irqsave(&info->lock, flags);
1764
1765         if (set & TIOCM_RTS)
1766                 info->MCR |= UART_MCR_RTS;
1767         if (set & TIOCM_DTR)
1768                 info->MCR |= UART_MCR_DTR;
1769
1770         if (clear & TIOCM_RTS)
1771                 info->MCR &= ~UART_MCR_RTS;
1772         if (clear & TIOCM_DTR)
1773                 info->MCR &= ~UART_MCR_DTR;
1774
1775         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1776         serial_out(info, UART_ESI_CMD2, UART_MCR);
1777         serial_out(info, UART_ESI_CMD2, info->MCR);
1778
1779         spin_unlock_irqrestore(&info->lock, flags);
1780         return 0;
1781 }
1782
1783 /*
1784  * rs_break() --- routine which turns the break handling on or off
1785  */
1786 static void esp_break(struct tty_struct *tty, int break_state)
1787 {
1788         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1789         unsigned long flags;
1790         
1791         if (serial_paranoia_check(info, tty->name, "esp_break"))
1792                 return;
1793
1794         if (break_state == -1) {
1795                 spin_lock_irqsave(&info->lock, flags);
1796                 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1797                 serial_out(info, UART_ESI_CMD2, 0x01);
1798                 spin_unlock_irqrestore(&info->lock, flags);
1799
1800                 /* FIXME - new style wait needed here */
1801                 interruptible_sleep_on(&info->break_wait);
1802         } else {
1803                 spin_lock_irqsave(&info->lock, flags);
1804                 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1805                 serial_out(info, UART_ESI_CMD2, 0x00);
1806                 spin_unlock_irqrestore(&info->lock, flags);
1807         }
1808 }
1809
1810 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1811                     unsigned int cmd, unsigned long arg)
1812 {
1813         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1814         struct async_icount cprev, cnow;        /* kernel counter temps */
1815         struct serial_icounter_struct __user *p_cuser;  /* user space */
1816         void __user *argp = (void __user *)arg;
1817         unsigned long flags;
1818
1819         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1820                 return -ENODEV;
1821
1822         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1823             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
1824             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1825             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1826             (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1827                 if (tty->flags & (1 << TTY_IO_ERROR))
1828                     return -EIO;
1829         }
1830         
1831         switch (cmd) {
1832                 case TIOCGSERIAL:
1833                         return get_serial_info(info, argp);
1834                 case TIOCSSERIAL:
1835                         return set_serial_info(info, argp);
1836                 case TIOCSERCONFIG:
1837                         /* do not reconfigure after initial configuration */
1838                         return 0;
1839
1840                 case TIOCSERGWILD:
1841                         return put_user(0L, (unsigned long __user *)argp);
1842
1843                 case TIOCSERGETLSR: /* Get line status register */
1844                             return get_lsr_info(info, argp);
1845
1846                 case TIOCSERSWILD:
1847                         if (!capable(CAP_SYS_ADMIN))
1848                                 return -EPERM;
1849                         return 0;
1850
1851                 /*
1852                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1853                  * - mask passed in arg for lines of interest
1854                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1855                  * Caller should use TIOCGICOUNT to see which one it was
1856                  */
1857                  case TIOCMIWAIT:
1858                         spin_lock_irqsave(&info->lock, flags);
1859                         cprev = info->icount;   /* note the counters on entry */
1860                         spin_unlock_irqrestore(&info->lock, flags);
1861                         while (1) {
1862                                 /* FIXME: convert to new style wakeup */
1863                                 interruptible_sleep_on(&info->delta_msr_wait);
1864                                 /* see if a signal did it */
1865                                 if (signal_pending(current))
1866                                         return -ERESTARTSYS;
1867                                 spin_lock_irqsave(&info->lock, flags);
1868                                 cnow = info->icount;    /* atomic copy */
1869                                 spin_unlock_irqrestore(&info->lock, flags);
1870                                 if (cnow.rng == cprev.rng &&
1871                                     cnow.dsr == cprev.dsr && 
1872                                     cnow.dcd == cprev.dcd &&
1873                                     cnow.cts == cprev.cts)
1874                                         return -EIO; /* no change => error */
1875                                 if (((arg & TIOCM_RNG) &&
1876                                      (cnow.rng != cprev.rng)) ||
1877                                      ((arg & TIOCM_DSR) &&
1878                                       (cnow.dsr != cprev.dsr)) ||
1879                                      ((arg & TIOCM_CD) &&
1880                                       (cnow.dcd != cprev.dcd)) ||
1881                                      ((arg & TIOCM_CTS) &&
1882                                       (cnow.cts != cprev.cts)) ) {
1883                                         return 0;
1884                                 }
1885                                 cprev = cnow;
1886                         }
1887                         /* NOTREACHED */
1888
1889                 /* 
1890                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1891                  * Return: write counters to the user passed counter struct
1892                  * NB: both 1->0 and 0->1 transitions are counted except for
1893                  *     RI where only 0->1 is counted.
1894                  */
1895                 case TIOCGICOUNT:
1896                         spin_lock_irqsave(&info->lock, flags);
1897                         cnow = info->icount;
1898                         spin_unlock_irqrestore(&info->lock, flags);
1899                         p_cuser = argp;
1900                         if (put_user(cnow.cts, &p_cuser->cts) ||
1901                             put_user(cnow.dsr, &p_cuser->dsr) ||
1902                             put_user(cnow.rng, &p_cuser->rng) ||
1903                             put_user(cnow.dcd, &p_cuser->dcd))
1904                                 return -EFAULT;
1905
1906                         return 0;
1907         case TIOCGHAYESESP:
1908                 return get_esp_config(info, argp);
1909         case TIOCSHAYESESP:
1910                 return set_esp_config(info, argp);
1911
1912                 default:
1913                         return -ENOIOCTLCMD;
1914                 }
1915         return 0;
1916 }
1917
1918 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1919 {
1920         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1921         unsigned long flags;
1922
1923         if (   (tty->termios->c_cflag == old_termios->c_cflag)
1924             && (   RELEVANT_IFLAG(tty->termios->c_iflag) 
1925                 == RELEVANT_IFLAG(old_termios->c_iflag)))
1926                 return;
1927
1928         change_speed(info);
1929
1930         spin_lock_irqsave(&info->lock, flags);
1931
1932         /* Handle transition to B0 status */
1933         if ((old_termios->c_cflag & CBAUD) &&
1934                 !(tty->termios->c_cflag & CBAUD)) {
1935                 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1936                 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1937                 serial_out(info, UART_ESI_CMD2, UART_MCR);
1938                 serial_out(info, UART_ESI_CMD2, info->MCR);
1939         }
1940
1941         /* Handle transition away from B0 status */
1942         if (!(old_termios->c_cflag & CBAUD) &&
1943                 (tty->termios->c_cflag & CBAUD)) {
1944                 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1945                 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1946                 serial_out(info, UART_ESI_CMD2, UART_MCR);
1947                 serial_out(info, UART_ESI_CMD2, info->MCR);
1948         }
1949
1950         spin_unlock_irqrestore(&info->lock, flags);
1951
1952         /* Handle turning of CRTSCTS */
1953         if ((old_termios->c_cflag & CRTSCTS) &&
1954             !(tty->termios->c_cflag & CRTSCTS)) {
1955                 rs_start(tty);
1956         }
1957 }
1958
1959 /*
1960  * ------------------------------------------------------------
1961  * rs_close()
1962  * 
1963  * This routine is called when the serial port gets closed.  First, we
1964  * wait for the last remaining data to be sent.  Then, we unlink its
1965  * async structure from the interrupt chain if necessary, and we free
1966  * that IRQ if nothing is left in the chain.
1967  * ------------------------------------------------------------
1968  */
1969 static void rs_close(struct tty_struct *tty, struct file * filp)
1970 {
1971         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1972         unsigned long flags;
1973
1974         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1975                 return;
1976         
1977         spin_lock_irqsave(&info->lock, flags);
1978         
1979         if (tty_hung_up_p(filp)) {
1980                 DBG_CNT("before DEC-hung");
1981                 goto out;
1982         }
1983         
1984 #ifdef SERIAL_DEBUG_OPEN
1985         printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1986 #endif
1987         if ((tty->count == 1) && (info->count != 1)) {
1988                 /*
1989                  * Uh, oh.  tty->count is 1, which means that the tty
1990                  * structure will be freed.  Info->count should always
1991                  * be one in these conditions.  If it's greater than
1992                  * one, we've got real problems, since it means the
1993                  * serial port won't be shutdown.
1994                  */
1995                 printk("rs_close: bad serial port count; tty->count is 1, "
1996                        "info->count is %d\n", info->count);
1997                 info->count = 1;
1998         }
1999         if (--info->count < 0) {
2000                 printk("rs_close: bad serial port count for ttys%d: %d\n",
2001                        info->line, info->count);
2002                 info->count = 0;
2003         }
2004         if (info->count) {
2005                 DBG_CNT("before DEC-2");
2006                 goto out;
2007         }
2008         info->flags |= ASYNC_CLOSING;
2009
2010         spin_unlock_irqrestore(&info->lock, flags);
2011         /*
2012          * Now we wait for the transmit buffer to clear; and we notify 
2013          * the line discipline to only process XON/XOFF characters.
2014          */
2015         tty->closing = 1;
2016         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
2017                 tty_wait_until_sent(tty, info->closing_wait);
2018         /*
2019          * At this point we stop accepting input.  To do this, we
2020          * disable the receive line status interrupts, and tell the
2021          * interrupt driver to stop checking the data ready bit in the
2022          * line status register.
2023          */
2024         /* info->IER &= ~UART_IER_RLSI; */
2025         info->IER &= ~UART_IER_RDI;
2026         info->read_status_mask &= ~UART_LSR_DR;
2027         if (info->flags & ASYNC_INITIALIZED) {
2028
2029                 spin_lock_irqsave(&info->lock, flags);
2030                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
2031                 serial_out(info, UART_ESI_CMD2, info->IER);
2032
2033                 /* disable receive timeout */
2034                 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
2035                 serial_out(info, UART_ESI_CMD2, 0x00);
2036
2037                 spin_unlock_irqrestore(&info->lock, flags);
2038
2039                 /*
2040                  * Before we drop DTR, make sure the UART transmitter
2041                  * has completely drained; this is especially
2042                  * important if there is a transmit FIFO!
2043                  */
2044                 rs_wait_until_sent(tty, info->timeout);
2045         }
2046         shutdown(info);
2047         if (tty->driver->flush_buffer)
2048                 tty->driver->flush_buffer(tty);
2049         tty_ldisc_flush(tty);
2050         tty->closing = 0;
2051         info->event = 0;
2052         info->tty = NULL;
2053
2054         if (info->blocked_open) {
2055                 if (info->close_delay) {
2056                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
2057                 }
2058                 wake_up_interruptible(&info->open_wait);
2059         }
2060         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2061         wake_up_interruptible(&info->close_wait);
2062         return;
2063
2064 out:
2065         spin_unlock_irqrestore(&info->lock, flags);
2066 }
2067
2068 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2069 {
2070         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2071         unsigned long orig_jiffies, char_time;
2072         unsigned long flags;
2073
2074         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2075                 return;
2076
2077         orig_jiffies = jiffies;
2078         char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2079
2080         if (!char_time)
2081                 char_time = 1;
2082
2083         spin_lock_irqsave(&info->lock, flags);
2084         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2085         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2086
2087         while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2088                 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2089
2090                 spin_unlock_irqrestore(&info->lock, flags);
2091                 msleep_interruptible(jiffies_to_msecs(char_time));
2092
2093                 if (signal_pending(current))
2094                         break;
2095
2096                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2097                         break;
2098
2099                 spin_lock_irqsave(&info->lock, flags);
2100                 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2101                 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2102         }
2103         spin_unlock_irqrestore(&info->lock, flags);
2104         set_current_state(TASK_RUNNING);
2105 }
2106
2107 /*
2108  * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2109  */
2110 static void esp_hangup(struct tty_struct *tty)
2111 {
2112         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2113         
2114         if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2115                 return;
2116         
2117         rs_flush_buffer(tty);
2118         shutdown(info);
2119         info->event = 0;
2120         info->count = 0;
2121         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2122         info->tty = NULL;
2123         wake_up_interruptible(&info->open_wait);
2124 }
2125
2126 /*
2127  * ------------------------------------------------------------
2128  * esp_open() and friends
2129  * ------------------------------------------------------------
2130  */
2131 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2132                            struct esp_struct *info)
2133 {
2134         DECLARE_WAITQUEUE(wait, current);
2135         int             retval;
2136         int             do_clocal = 0;
2137         unsigned long   flags;
2138
2139         /*
2140          * If the device is in the middle of being closed, then block
2141          * until it's done, and then try again.
2142          */
2143         if (tty_hung_up_p(filp) ||
2144             (info->flags & ASYNC_CLOSING)) {
2145                 if (info->flags & ASYNC_CLOSING)
2146                         interruptible_sleep_on(&info->close_wait);
2147 #ifdef SERIAL_DO_RESTART
2148                 if (info->flags & ASYNC_HUP_NOTIFY)
2149                         return -EAGAIN;
2150                 else
2151                         return -ERESTARTSYS;
2152 #else
2153                 return -EAGAIN;
2154 #endif
2155         }
2156
2157         /*
2158          * If non-blocking mode is set, or the port is not enabled,
2159          * then make the check up front and then exit.
2160          */
2161         if ((filp->f_flags & O_NONBLOCK) ||
2162             (tty->flags & (1 << TTY_IO_ERROR))) {
2163                 info->flags |= ASYNC_NORMAL_ACTIVE;
2164                 return 0;
2165         }
2166
2167         if (tty->termios->c_cflag & CLOCAL)
2168                 do_clocal = 1;
2169
2170         /*
2171          * Block waiting for the carrier detect and the line to become
2172          * free (i.e., not in use by the callout).  While we are in
2173          * this loop, info->count is dropped by one, so that
2174          * rs_close() knows when to free things.  We restore it upon
2175          * exit, either normal or abnormal.
2176          */
2177         retval = 0;
2178         add_wait_queue(&info->open_wait, &wait);
2179 #ifdef SERIAL_DEBUG_OPEN
2180         printk("block_til_ready before block: ttys%d, count = %d\n",
2181                info->line, info->count);
2182 #endif
2183         spin_lock_irqsave(&info->lock, flags);
2184         if (!tty_hung_up_p(filp)) 
2185                 info->count--;
2186         info->blocked_open++;
2187         while (1) {
2188                 if ((tty->termios->c_cflag & CBAUD)) {
2189                         unsigned int scratch;
2190
2191                         serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2192                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2193                         scratch = serial_in(info, UART_ESI_STAT1);
2194                         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2195                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2196                         serial_out(info, UART_ESI_CMD2,
2197                                 scratch | UART_MCR_DTR | UART_MCR_RTS);
2198                 }
2199                 set_current_state(TASK_INTERRUPTIBLE);
2200                 if (tty_hung_up_p(filp) ||
2201                     !(info->flags & ASYNC_INITIALIZED)) {
2202 #ifdef SERIAL_DO_RESTART
2203                         if (info->flags & ASYNC_HUP_NOTIFY)
2204                                 retval = -EAGAIN;
2205                         else
2206                                 retval = -ERESTARTSYS;  
2207 #else
2208                         retval = -EAGAIN;
2209 #endif
2210                         break;
2211                 }
2212
2213                 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2214                 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2215                         do_clocal = 1;
2216
2217                 if (!(info->flags & ASYNC_CLOSING) &&
2218                     (do_clocal))
2219                         break;
2220                 if (signal_pending(current)) {
2221                         retval = -ERESTARTSYS;
2222                         break;
2223                 }
2224 #ifdef SERIAL_DEBUG_OPEN
2225                 printk("block_til_ready blocking: ttys%d, count = %d\n",
2226                        info->line, info->count);
2227 #endif
2228                 spin_unlock_irqrestore(&info->lock, flags);
2229                 schedule();
2230                 spin_lock_irqsave(&info->lock, flags);
2231         }
2232         set_current_state(TASK_RUNNING);
2233         remove_wait_queue(&info->open_wait, &wait);
2234         if (!tty_hung_up_p(filp))
2235                 info->count++;
2236         info->blocked_open--;
2237         spin_unlock_irqrestore(&info->lock, flags);
2238 #ifdef SERIAL_DEBUG_OPEN
2239         printk("block_til_ready after blocking: ttys%d, count = %d\n",
2240                info->line, info->count);
2241 #endif
2242         if (retval)
2243                 return retval;
2244         info->flags |= ASYNC_NORMAL_ACTIVE;
2245         return 0;
2246 }       
2247
2248 /*
2249  * This routine is called whenever a serial port is opened.  It
2250  * enables interrupts for a serial port, linking in its async structure into
2251  * the IRQ chain.   It also performs the serial-specific
2252  * initialization for the tty structure.
2253  */
2254 static int esp_open(struct tty_struct *tty, struct file * filp)
2255 {
2256         struct esp_struct       *info;
2257         int                     retval, line;
2258         unsigned long           flags;
2259
2260         line = tty->index;
2261         if ((line < 0) || (line >= NR_PORTS))
2262                 return -ENODEV;
2263
2264         /* find the port in the chain */
2265
2266         info = ports;
2267
2268         while (info && (info->line != line))
2269                 info = info->next_port;
2270
2271         if (!info) {
2272                 serial_paranoia_check(info, tty->name, "esp_open");
2273                 return -ENODEV;
2274         }
2275
2276 #ifdef SERIAL_DEBUG_OPEN
2277         printk("esp_open %s, count = %d\n", tty->name, info->count);
2278 #endif
2279         spin_lock_irqsave(&info->lock, flags);
2280         info->count++;
2281         tty->driver_data = info;
2282         info->tty = tty;
2283
2284         spin_unlock_irqrestore(&info->lock, flags);
2285         
2286         /*
2287          * Start up serial port
2288          */
2289         retval = startup(info);
2290         if (retval)
2291                 return retval;
2292
2293         retval = block_til_ready(tty, filp, info);
2294         if (retval) {
2295 #ifdef SERIAL_DEBUG_OPEN
2296                 printk("esp_open returning after block_til_ready with %d\n",
2297                        retval);
2298 #endif
2299                 return retval;
2300         }
2301
2302 #ifdef SERIAL_DEBUG_OPEN
2303         printk("esp_open %s successful...", tty->name);
2304 #endif
2305         return 0;
2306 }
2307
2308 /*
2309  * ---------------------------------------------------------------------
2310  * espserial_init() and friends
2311  *
2312  * espserial_init() is called at boot-time to initialize the serial driver.
2313  * ---------------------------------------------------------------------
2314  */
2315
2316 /*
2317  * This routine prints out the appropriate serial driver version
2318  * number, and identifies which options were configured into this
2319  * driver.
2320  */
2321  
2322 static inline void show_serial_version(void)
2323 {
2324         printk(KERN_INFO "%s version %s (DMA %u)\n",
2325                 serial_name, serial_version, dma);
2326 }
2327
2328 /*
2329  * This routine is called by espserial_init() to initialize a specific serial
2330  * port.
2331  */
2332 static inline int autoconfig(struct esp_struct * info)
2333 {
2334         int port_detected = 0;
2335         unsigned long flags;
2336
2337         if (!request_region(info->port, REGION_SIZE, "esp serial"))
2338                 return -EIO;
2339
2340         spin_lock_irqsave(&info->lock, flags);
2341         /*
2342          * Check for ESP card
2343          */
2344
2345         if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2346                 serial_out(info, UART_ESI_CMD1, 0x00);
2347                 serial_out(info, UART_ESI_CMD1, 0x01);
2348
2349                 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2350                         port_detected = 1;
2351
2352                         if (!(info->irq)) {
2353                                 serial_out(info, UART_ESI_CMD1, 0x02);
2354
2355                                 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2356                                         info->irq = 3;
2357                                 else
2358                                         info->irq = 4;
2359                         }
2360
2361
2362                         /* put card in enhanced mode */
2363                         /* this prevents access through */
2364                         /* the "old" IO ports */
2365                         esp_basic_init(info);
2366
2367                         /* clear out MCR */
2368                         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2369                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2370                         serial_out(info, UART_ESI_CMD2, 0x00);
2371                 }
2372         }
2373         if (!port_detected)
2374                 release_region(info->port, REGION_SIZE);
2375
2376         spin_unlock_irqrestore(&info->lock, flags);
2377         return (port_detected);
2378 }
2379
2380 static const struct tty_operations esp_ops = {
2381         .open = esp_open,
2382         .close = rs_close,
2383         .write = rs_write,
2384         .put_char = rs_put_char,
2385         .flush_chars = rs_flush_chars,
2386         .write_room = rs_write_room,
2387         .chars_in_buffer = rs_chars_in_buffer,
2388         .flush_buffer = rs_flush_buffer,
2389         .ioctl = rs_ioctl,
2390         .throttle = rs_throttle,
2391         .unthrottle = rs_unthrottle,
2392         .set_termios = rs_set_termios,
2393         .stop = rs_stop,
2394         .start = rs_start,
2395         .hangup = esp_hangup,
2396         .break_ctl = esp_break,
2397         .wait_until_sent = rs_wait_until_sent,
2398         .tiocmget = esp_tiocmget,
2399         .tiocmset = esp_tiocmset,
2400 };
2401
2402 /*
2403  * The serial driver boot-time initialization code!
2404  */
2405 static int __init espserial_init(void)
2406 {
2407         int i, offset;
2408         struct esp_struct * info;
2409         struct esp_struct *last_primary = NULL;
2410         int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2411
2412         esp_driver = alloc_tty_driver(NR_PORTS);
2413         if (!esp_driver)
2414                 return -ENOMEM;
2415         
2416         for (i = 0; i < NR_PRIMARY; i++) {
2417                 if (irq[i] != 0) {
2418                         if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2419                             (irq[i] == 8) || (irq[i] == 13))
2420                                 irq[i] = 0;
2421                         else if (irq[i] == 2)
2422                                 irq[i] = 9;
2423                 }
2424         }
2425
2426         if ((dma != 1) && (dma != 3))
2427                 dma = 0;
2428
2429         if ((rx_trigger < 1) || (rx_trigger > 1023))
2430                 rx_trigger = 768;
2431
2432         if ((tx_trigger < 1) || (tx_trigger > 1023))
2433                 tx_trigger = 768;
2434
2435         if ((flow_off < 1) || (flow_off > 1023))
2436                 flow_off = 1016;
2437         
2438         if ((flow_on < 1) || (flow_on > 1023))
2439                 flow_on = 944;
2440
2441         if ((rx_timeout < 0) || (rx_timeout > 255))
2442                 rx_timeout = 128;
2443         
2444         if (flow_on >= flow_off)
2445                 flow_on = flow_off - 1;
2446
2447         show_serial_version();
2448
2449         /* Initialize the tty_driver structure */
2450         
2451         esp_driver->owner = THIS_MODULE;
2452         esp_driver->name = "ttyP";
2453         esp_driver->major = ESP_IN_MAJOR;
2454         esp_driver->minor_start = 0;
2455         esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2456         esp_driver->subtype = SERIAL_TYPE_NORMAL;
2457         esp_driver->init_termios = tty_std_termios;
2458         esp_driver->init_termios.c_cflag =
2459                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2460         esp_driver->flags = TTY_DRIVER_REAL_RAW;
2461         tty_set_operations(esp_driver, &esp_ops);
2462         if (tty_register_driver(esp_driver))
2463         {
2464                 printk(KERN_ERR "Couldn't register esp serial driver");
2465                 put_tty_driver(esp_driver);
2466                 return 1;
2467         }
2468
2469         info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2470
2471         if (!info)
2472         {
2473                 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2474                 tty_unregister_driver(esp_driver);
2475                 put_tty_driver(esp_driver);
2476                 return 1;
2477         }
2478
2479         memset((void *)info, 0, sizeof(struct esp_struct));
2480         spin_lock_init(&info->lock);
2481         /* rx_trigger, tx_trigger are needed by autoconfig */
2482         info->config.rx_trigger = rx_trigger;
2483         info->config.tx_trigger = tx_trigger;
2484
2485         i = 0;
2486         offset = 0;
2487
2488         do {
2489                 info->port = esp[i] + offset;
2490                 info->irq = irq[i];
2491                 info->line = (i * 8) + (offset / 8);
2492
2493                 if (!autoconfig(info)) {
2494                         i++;
2495                         offset = 0;
2496                         continue;
2497                 }
2498
2499                 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2500                 info->flags = STD_COM_FLAGS;
2501                 if (info->custom_divisor)
2502                         info->flags |= ASYNC_SPD_CUST;
2503                 info->magic = ESP_MAGIC;
2504                 info->close_delay = 5*HZ/10;
2505                 info->closing_wait = 30*HZ;
2506                 INIT_WORK(&info->tqueue, do_softint);
2507                 INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
2508                 info->config.rx_timeout = rx_timeout;
2509                 info->config.flow_on = flow_on;
2510                 info->config.flow_off = flow_off;
2511                 info->config.pio_threshold = pio_threshold;
2512                 info->next_port = ports;
2513                 init_waitqueue_head(&info->open_wait);
2514                 init_waitqueue_head(&info->close_wait);
2515                 init_waitqueue_head(&info->delta_msr_wait);
2516                 init_waitqueue_head(&info->break_wait);
2517                 ports = info;
2518                 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2519                         info->line, info->port, info->irq);
2520
2521                 if (info->line % 8) {
2522                         printk("secondary port\n");
2523                         /* 8 port cards can't do DMA */
2524                         info->stat_flags |= ESP_STAT_NEVER_DMA;
2525
2526                         if (last_primary)
2527                                 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2528                 } else {
2529                         printk("primary port\n");
2530                         last_primary = info;
2531                         irq[i] = info->irq;
2532                 }
2533
2534                 if (!dma)
2535                         info->stat_flags |= ESP_STAT_NEVER_DMA;
2536
2537                 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2538                 if (!info)
2539                 {
2540                         printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); 
2541
2542                         /* allow use of the already detected ports */
2543                         return 0;
2544                 }
2545
2546                 memset((void *)info, 0, sizeof(struct esp_struct));
2547                 /* rx_trigger, tx_trigger are needed by autoconfig */
2548                 info->config.rx_trigger = rx_trigger;
2549                 info->config.tx_trigger = tx_trigger;
2550
2551                 if (offset == 56) {
2552                         i++;
2553                         offset = 0;
2554                 } else {
2555                         offset += 8;
2556                 }
2557         } while (i < NR_PRIMARY);
2558
2559         /* free the last port memory allocation */
2560         kfree(info);
2561
2562         return 0;
2563 }
2564
2565 static void __exit espserial_exit(void) 
2566 {
2567         int e1;
2568         struct esp_struct *temp_async;
2569         struct esp_pio_buffer *pio_buf;
2570
2571         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2572         if ((e1 = tty_unregister_driver(esp_driver)))
2573                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2574                        e1);
2575         put_tty_driver(esp_driver);
2576
2577         while (ports) {
2578                 if (ports->port) {
2579                         release_region(ports->port, REGION_SIZE);
2580                 }
2581                 temp_async = ports->next_port;
2582                 kfree(ports);
2583                 ports = temp_async;
2584         }
2585
2586         if (dma_buffer)
2587                 free_pages((unsigned long)dma_buffer,
2588                         get_order(DMA_BUFFER_SZ));
2589
2590         while (free_pio_buf) {
2591                 pio_buf = free_pio_buf->next;
2592                 kfree(free_pio_buf);
2593                 free_pio_buf = pio_buf;
2594         }
2595 }
2596
2597 module_init(espserial_init);
2598 module_exit(espserial_exit);