15a4ea896328cc23ad6be070357b76baf41c59bd
[linux-3.10.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(void *private_)
727 {
728         struct esp_struct       *info = (struct esp_struct *) private_;
729         struct tty_struct       *tty;
730         
731         tty = info->tty;
732         if (!tty)
733                 return;
734
735         if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
736                 tty_wakeup(tty);
737         }
738 }
739
740 /*
741  * This routine is called from the scheduler tqueue when the interrupt
742  * routine has signalled that a hangup has occurred.  The path of
743  * hangup processing is:
744  *
745  *      serial interrupt routine -> (scheduler tqueue) ->
746  *      do_serial_hangup() -> tty->hangup() -> esp_hangup()
747  * 
748  */
749 static void do_serial_hangup(void *private_)
750 {
751         struct esp_struct       *info = (struct esp_struct *) private_;
752         struct tty_struct       *tty;
753         
754         tty = info->tty;
755         if (tty)
756                 tty_hangup(tty);
757 }
758
759 /*
760  * ---------------------------------------------------------------
761  * Low level utility subroutines for the serial driver:  routines to
762  * figure out the appropriate timeout for an interrupt chain, routines
763  * to initialize and startup a serial port, and routines to shutdown a
764  * serial port.  Useful stuff like that.
765  *
766  * Caller should hold lock
767  * ---------------------------------------------------------------
768  */
769
770 static inline void esp_basic_init(struct esp_struct * info)
771 {
772         /* put ESPC in enhanced mode */
773         serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
774         
775         if (info->stat_flags & ESP_STAT_NEVER_DMA)
776                 serial_out(info, UART_ESI_CMD2, 0x01);
777         else
778                 serial_out(info, UART_ESI_CMD2, 0x31);
779
780         /* disable interrupts for now */
781         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
782         serial_out(info, UART_ESI_CMD2, 0x00);
783
784         /* set interrupt and DMA channel */
785         serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
786
787         if (info->stat_flags & ESP_STAT_NEVER_DMA)
788                 serial_out(info, UART_ESI_CMD2, 0x01);
789         else
790                 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
791
792         serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
793
794         if (info->line % 8)     /* secondary port */
795                 serial_out(info, UART_ESI_CMD2, 0x0d);  /* shared */
796         else if (info->irq == 9)
797                 serial_out(info, UART_ESI_CMD2, 0x02);
798         else
799                 serial_out(info, UART_ESI_CMD2, info->irq);
800
801         /* set error status mask (check this) */
802         serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
803
804         if (info->stat_flags & ESP_STAT_NEVER_DMA)
805                 serial_out(info, UART_ESI_CMD2, 0xa1);
806         else
807                 serial_out(info, UART_ESI_CMD2, 0xbd);
808
809         serial_out(info, UART_ESI_CMD2, 0x00);
810
811         /* set DMA timeout */
812         serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
813         serial_out(info, UART_ESI_CMD2, 0xff);
814
815         /* set FIFO trigger levels */
816         serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
817         serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
818         serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
819         serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
820         serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
821
822         /* Set clock scaling and wait states */
823         serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
824         serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
825
826         /* set reinterrupt pacing */
827         serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
828         serial_out(info, UART_ESI_CMD2, 0xff);
829 }
830
831 static int startup(struct esp_struct * info)
832 {
833         unsigned long flags;
834         int     retval=0;
835         unsigned int num_chars;
836
837         spin_lock_irqsave(&info->lock, flags);
838
839         if (info->flags & ASYNC_INITIALIZED)
840                 goto out;
841
842         if (!info->xmit_buf) {
843                 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
844                 retval = -ENOMEM;
845                 if (!info->xmit_buf)
846                         goto out;
847         }
848
849 #ifdef SERIAL_DEBUG_OPEN
850         printk("starting up ttys%d (irq %d)...", info->line, info->irq);
851 #endif
852
853         /* Flush the RX buffer.  Using the ESI flush command may cause */
854         /* wild interrupts, so read all the data instead. */
855
856         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
857         serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
858         num_chars = serial_in(info, UART_ESI_STAT1) << 8;
859         num_chars |= serial_in(info, UART_ESI_STAT2);
860
861         while (num_chars > 1) {
862                 inw(info->port + UART_ESI_RX);
863                 num_chars -= 2;
864         }
865
866         if (num_chars)
867                 serial_in(info, UART_ESI_RX);
868
869         /* set receive character timeout */
870         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
871         serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
872
873         /* clear all flags except the "never DMA" flag */
874         info->stat_flags &= ESP_STAT_NEVER_DMA;
875
876         if (info->stat_flags & ESP_STAT_NEVER_DMA)
877                 info->stat_flags |= ESP_STAT_USE_PIO;
878
879         spin_unlock_irqrestore(&info->lock, flags);
880
881         /*
882          * Allocate the IRQ
883          */
884
885         retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
886                              "esp serial", info);
887
888         if (retval) {
889                 if (capable(CAP_SYS_ADMIN)) {
890                         if (info->tty)
891                                 set_bit(TTY_IO_ERROR,
892                                         &info->tty->flags);
893                         retval = 0;
894                 }
895                 goto out_unlocked;
896         }
897
898         if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
899                 dma_buffer = (char *)__get_dma_pages(
900                         GFP_KERNEL, get_order(DMA_BUFFER_SZ));
901
902                 /* use PIO mode if DMA buf/chan cannot be allocated */
903                 if (!dma_buffer)
904                         info->stat_flags |= ESP_STAT_USE_PIO;
905                 else if (request_dma(dma, "esp serial")) {
906                         free_pages((unsigned long)dma_buffer,
907                                    get_order(DMA_BUFFER_SZ));
908                         dma_buffer = NULL;
909                         info->stat_flags |= ESP_STAT_USE_PIO;
910                 }
911                         
912         }
913
914         info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
915
916         spin_lock_irqsave(&info->lock, flags);
917         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
918         serial_out(info, UART_ESI_CMD2, UART_MCR);
919         serial_out(info, UART_ESI_CMD2, info->MCR);
920         
921         /*
922          * Finally, enable interrupts
923          */
924         /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
925         info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
926                         UART_IER_DMA_TC;
927         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
928         serial_out(info, UART_ESI_CMD2, info->IER);
929         
930         if (info->tty)
931                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
932         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
933         spin_unlock_irqrestore(&info->lock, flags);
934
935         /*
936          * Set up the tty->alt_speed kludge
937          */
938         if (info->tty) {
939                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
940                         info->tty->alt_speed = 57600;
941                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
942                         info->tty->alt_speed = 115200;
943                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
944                         info->tty->alt_speed = 230400;
945                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
946                         info->tty->alt_speed = 460800;
947         }
948         
949         /*
950          * set the speed of the serial port
951          */
952         change_speed(info);
953         info->flags |= ASYNC_INITIALIZED;
954         return 0;
955
956 out:
957         spin_unlock_irqrestore(&info->lock, flags);
958 out_unlocked:
959         return retval;
960 }
961
962 /*
963  * This routine will shutdown a serial port; interrupts are disabled, and
964  * DTR is dropped if the hangup on close termio flag is on.
965  */
966 static void shutdown(struct esp_struct * info)
967 {
968         unsigned long   flags, f;
969
970         if (!(info->flags & ASYNC_INITIALIZED))
971                 return;
972
973 #ifdef SERIAL_DEBUG_OPEN
974         printk("Shutting down serial port %d (irq %d)....", info->line,
975                info->irq);
976 #endif
977         
978         spin_lock_irqsave(&info->lock, flags);
979         /*
980          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
981          * here so the queue might never be waken up
982          */
983         wake_up_interruptible(&info->delta_msr_wait);
984         wake_up_interruptible(&info->break_wait);
985
986         /* stop a DMA transfer on the port being closed */
987         /* DMA lock is higher priority always */
988         if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
989                 f=claim_dma_lock();
990                 disable_dma(dma);
991                 clear_dma_ff(dma);
992                 release_dma_lock(f);
993                 
994                 dma_bytes = 0;
995         }
996         
997         /*
998          * Free the IRQ
999          */
1000         free_irq(info->irq, info);
1001
1002         if (dma_buffer) {
1003                 struct esp_struct *current_port = ports;
1004
1005                 while (current_port) {
1006                         if ((current_port != info) &&
1007                             (current_port->flags & ASYNC_INITIALIZED))
1008                                 break;
1009
1010                         current_port = current_port->next_port;
1011                 }
1012
1013                 if (!current_port) {
1014                         free_dma(dma);
1015                         free_pages((unsigned long)dma_buffer,
1016                                    get_order(DMA_BUFFER_SZ));
1017                         dma_buffer = NULL;
1018                 }               
1019         }
1020
1021         if (info->xmit_buf) {
1022                 free_page((unsigned long) info->xmit_buf);
1023                 info->xmit_buf = NULL;
1024         }
1025
1026         info->IER = 0;
1027         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1028         serial_out(info, UART_ESI_CMD2, 0x00);
1029
1030         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1031                 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1032
1033         info->MCR &= ~UART_MCR_OUT2;
1034         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1035         serial_out(info, UART_ESI_CMD2, UART_MCR);
1036         serial_out(info, UART_ESI_CMD2, info->MCR);
1037
1038         if (info->tty)
1039                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1040         
1041         info->flags &= ~ASYNC_INITIALIZED;
1042         spin_unlock_irqrestore(&info->lock, flags);
1043 }
1044
1045 /*
1046  * This routine is called to set the UART divisor registers to match
1047  * the specified baud rate for a serial port.
1048  */
1049 static void change_speed(struct esp_struct *info)
1050 {
1051         unsigned short port;
1052         int     quot = 0;
1053         unsigned cflag,cval;
1054         int     baud, bits;
1055         unsigned char flow1 = 0, flow2 = 0;
1056         unsigned long flags;
1057
1058         if (!info->tty || !info->tty->termios)
1059                 return;
1060         cflag = info->tty->termios->c_cflag;
1061         port = info->port;
1062         
1063         /* byte size and parity */
1064         switch (cflag & CSIZE) {
1065               case CS5: cval = 0x00; bits = 7; break;
1066               case CS6: cval = 0x01; bits = 8; break;
1067               case CS7: cval = 0x02; bits = 9; break;
1068               case CS8: cval = 0x03; bits = 10; break;
1069               default:  cval = 0x00; bits = 7; break;
1070         }
1071         if (cflag & CSTOPB) {
1072                 cval |= 0x04;
1073                 bits++;
1074         }
1075         if (cflag & PARENB) {
1076                 cval |= UART_LCR_PARITY;
1077                 bits++;
1078         }
1079         if (!(cflag & PARODD))
1080                 cval |= UART_LCR_EPAR;
1081 #ifdef CMSPAR
1082         if (cflag & CMSPAR)
1083                 cval |= UART_LCR_SPAR;
1084 #endif
1085
1086         baud = tty_get_baud_rate(info->tty);
1087         if (baud == 38400 &&
1088             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1089                 quot = info->custom_divisor;
1090         else {
1091                 if (baud == 134)
1092                         /* Special case since 134 is really 134.5 */
1093                         quot = (2*BASE_BAUD / 269);
1094                 else if (baud)
1095                         quot = BASE_BAUD / baud;
1096         }
1097         /* If the quotient is ever zero, default to 9600 bps */
1098         if (!quot)
1099                 quot = BASE_BAUD / 9600;
1100         
1101         info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1102
1103         /* CTS flow control flag and modem status interrupts */
1104         /* info->IER &= ~UART_IER_MSI; */
1105         if (cflag & CRTSCTS) {
1106                 info->flags |= ASYNC_CTS_FLOW;
1107                 /* info->IER |= UART_IER_MSI; */
1108                 flow1 = 0x04;
1109                 flow2 = 0x10;
1110         } else
1111                 info->flags &= ~ASYNC_CTS_FLOW;
1112         if (cflag & CLOCAL)
1113                 info->flags &= ~ASYNC_CHECK_CD;
1114         else {
1115                 info->flags |= ASYNC_CHECK_CD;
1116                 /* info->IER |= UART_IER_MSI; */
1117         }
1118
1119         /*
1120          * Set up parity check flag
1121          */
1122 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1123
1124         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1125         if (I_INPCK(info->tty))
1126                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1127         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1128                 info->read_status_mask |= UART_LSR_BI;
1129         
1130         info->ignore_status_mask = 0;
1131 #if 0
1132         /* This should be safe, but for some broken bits of hardware... */
1133         if (I_IGNPAR(info->tty)) {
1134                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1135                 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1136         }
1137 #endif
1138         if (I_IGNBRK(info->tty)) {
1139                 info->ignore_status_mask |= UART_LSR_BI;
1140                 info->read_status_mask |= UART_LSR_BI;
1141                 /*
1142                  * If we're ignore parity and break indicators, ignore 
1143                  * overruns too.  (For real raw support).
1144                  */
1145                 if (I_IGNPAR(info->tty)) {
1146                         info->ignore_status_mask |= UART_LSR_OE | \
1147                                 UART_LSR_PE | UART_LSR_FE;
1148                         info->read_status_mask |= UART_LSR_OE | \
1149                                 UART_LSR_PE | UART_LSR_FE;
1150                 }
1151         }
1152
1153         if (I_IXOFF(info->tty))
1154                 flow1 |= 0x81;
1155
1156         spin_lock_irqsave(&info->lock, flags);
1157         /* set baud */
1158         serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1159         serial_out(info, UART_ESI_CMD2, quot >> 8);
1160         serial_out(info, UART_ESI_CMD2, quot & 0xff);
1161
1162         /* set data bits, parity, etc. */
1163         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1164         serial_out(info, UART_ESI_CMD2, UART_LCR);
1165         serial_out(info, UART_ESI_CMD2, cval);
1166
1167         /* Enable flow control */
1168         serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1169         serial_out(info, UART_ESI_CMD2, flow1);
1170         serial_out(info, UART_ESI_CMD2, flow2);
1171
1172         /* set flow control characters (XON/XOFF only) */
1173         if (I_IXOFF(info->tty)) {
1174                 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1175                 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1176                 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1177                 serial_out(info, UART_ESI_CMD2, 0x10);
1178                 serial_out(info, UART_ESI_CMD2, 0x21);
1179                 switch (cflag & CSIZE) {
1180                         case CS5:
1181                                 serial_out(info, UART_ESI_CMD2, 0x1f);
1182                                 break;
1183                         case CS6:
1184                                 serial_out(info, UART_ESI_CMD2, 0x3f);
1185                                 break;
1186                         case CS7:
1187                         case CS8:
1188                                 serial_out(info, UART_ESI_CMD2, 0x7f);
1189                                 break;
1190                         default:
1191                                 serial_out(info, UART_ESI_CMD2, 0xff);
1192                                 break;
1193                 }
1194         }
1195
1196         /* Set high/low water */
1197         serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1198         serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1199         serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1200         serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1201         serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1202
1203         spin_unlock_irqrestore(&info->lock, flags);
1204 }
1205
1206 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1207 {
1208         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1209         unsigned long flags;
1210
1211         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1212                 return;
1213
1214         if (!info->xmit_buf)
1215                 return;
1216
1217         spin_lock_irqsave(&info->lock, flags);
1218         if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
1219                 info->xmit_buf[info->xmit_head++] = ch;
1220                 info->xmit_head &= ESP_XMIT_SIZE-1;
1221                 info->xmit_cnt++;
1222         }
1223         spin_unlock_irqrestore(&info->lock, flags);
1224 }
1225
1226 static void rs_flush_chars(struct tty_struct *tty)
1227 {
1228         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1229         unsigned long flags;
1230                                 
1231         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1232                 return;
1233
1234         spin_lock_irqsave(&info->lock, flags);
1235
1236         if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1237                 goto out;
1238
1239         if (!(info->IER & UART_IER_THRI)) {
1240                 info->IER |= UART_IER_THRI;
1241                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1242                 serial_out(info, UART_ESI_CMD2, info->IER);
1243         }
1244 out:
1245         spin_unlock_irqrestore(&info->lock, flags);
1246 }
1247
1248 static int rs_write(struct tty_struct * tty,
1249                     const unsigned char *buf, int count)
1250 {
1251         int     c, t, ret = 0;
1252         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1253         unsigned long flags;
1254
1255         if (serial_paranoia_check(info, tty->name, "rs_write"))
1256                 return 0;
1257
1258         if (!info->xmit_buf)
1259                 return 0;
1260             
1261         while (1) {
1262                 /* Thanks to R. Wolff for suggesting how to do this with */
1263                 /* interrupts enabled */
1264
1265                 c = count;
1266                 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1267                 
1268                 if (t < c)
1269                         c = t;
1270
1271                 t = ESP_XMIT_SIZE - info->xmit_head;
1272                 
1273                 if (t < c)
1274                         c = t;
1275
1276                 if (c <= 0)
1277                         break;
1278
1279                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1280
1281                 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1282                 info->xmit_cnt += c;
1283                 buf += c;
1284                 count -= c;
1285                 ret += c;
1286         }
1287
1288         spin_lock_irqsave(&info->lock, flags);
1289
1290         if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1291                 info->IER |= UART_IER_THRI;
1292                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1293                 serial_out(info, UART_ESI_CMD2, info->IER);
1294         }
1295
1296         spin_unlock_irqrestore(&info->lock, flags);
1297         return ret;
1298 }
1299
1300 static int rs_write_room(struct tty_struct *tty)
1301 {
1302         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1303         int     ret;
1304         unsigned long flags;
1305                                 
1306         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1307                 return 0;
1308
1309         spin_lock_irqsave(&info->lock, flags);
1310
1311         ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1312         if (ret < 0)
1313                 ret = 0;
1314         spin_unlock_irqrestore(&info->lock, flags);
1315         return ret;
1316 }
1317
1318 static int rs_chars_in_buffer(struct tty_struct *tty)
1319 {
1320         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1321                                 
1322         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1323                 return 0;
1324         return info->xmit_cnt;
1325 }
1326
1327 static void rs_flush_buffer(struct tty_struct *tty)
1328 {
1329         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1330         unsigned long flags;
1331                                 
1332         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1333                 return;
1334         spin_lock_irqsave(&info->lock, flags);
1335         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1336         spin_unlock_irqrestore(&info->lock, flags);
1337         tty_wakeup(tty);
1338 }
1339
1340 /*
1341  * ------------------------------------------------------------
1342  * rs_throttle()
1343  * 
1344  * This routine is called by the upper-layer tty layer to signal that
1345  * incoming characters should be throttled.
1346  * ------------------------------------------------------------
1347  */
1348 static void rs_throttle(struct tty_struct * tty)
1349 {
1350         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1351         unsigned long flags;
1352 #ifdef SERIAL_DEBUG_THROTTLE
1353         char    buf[64];
1354         
1355         printk("throttle %s: %d....\n", tty_name(tty, buf),
1356                tty->ldisc.chars_in_buffer(tty));
1357 #endif
1358
1359         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1360                 return;
1361
1362         spin_lock_irqsave(&info->lock, flags);
1363         info->IER &= ~UART_IER_RDI;
1364         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1365         serial_out(info, UART_ESI_CMD2, info->IER);
1366         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1367         serial_out(info, UART_ESI_CMD2, 0x00);
1368         spin_unlock_irqrestore(&info->lock, flags);
1369 }
1370
1371 static void rs_unthrottle(struct tty_struct * tty)
1372 {
1373         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1374         unsigned long flags;
1375 #ifdef SERIAL_DEBUG_THROTTLE
1376         char    buf[64];
1377         
1378         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1379                tty->ldisc.chars_in_buffer(tty));
1380 #endif
1381
1382         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1383                 return;
1384         
1385         spin_lock_irqsave(&info->lock, flags);
1386         info->IER |= UART_IER_RDI;
1387         serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1388         serial_out(info, UART_ESI_CMD2, info->IER);
1389         serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1390         serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1391         spin_unlock_irqrestore(&info->lock, flags);
1392 }
1393
1394 /*
1395  * ------------------------------------------------------------
1396  * rs_ioctl() and friends
1397  * ------------------------------------------------------------
1398  */
1399
1400 static int get_serial_info(struct esp_struct * info,
1401                            struct serial_struct __user *retinfo)
1402 {
1403         struct serial_struct tmp;
1404   
1405         memset(&tmp, 0, sizeof(tmp));
1406         tmp.type = PORT_16550A;
1407         tmp.line = info->line;
1408         tmp.port = info->port;
1409         tmp.irq = info->irq;
1410         tmp.flags = info->flags;
1411         tmp.xmit_fifo_size = 1024;
1412         tmp.baud_base = BASE_BAUD;
1413         tmp.close_delay = info->close_delay;
1414         tmp.closing_wait = info->closing_wait;
1415         tmp.custom_divisor = info->custom_divisor;
1416         tmp.hub6 = 0;
1417         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1418                 return -EFAULT;
1419         return 0;
1420 }
1421
1422 static int get_esp_config(struct esp_struct * info,
1423                           struct hayes_esp_config __user *retinfo)
1424 {
1425         struct hayes_esp_config tmp;
1426   
1427         if (!retinfo)
1428                 return -EFAULT;
1429
1430         memset(&tmp, 0, sizeof(tmp));
1431         tmp.rx_timeout = info->config.rx_timeout;
1432         tmp.rx_trigger = info->config.rx_trigger;
1433         tmp.tx_trigger = info->config.tx_trigger;
1434         tmp.flow_off = info->config.flow_off;
1435         tmp.flow_on = info->config.flow_on;
1436         tmp.pio_threshold = info->config.pio_threshold;
1437         tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1438
1439         return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1440 }
1441
1442 static int set_serial_info(struct esp_struct * info,
1443                            struct serial_struct __user *new_info)
1444 {
1445         struct serial_struct new_serial;
1446         struct esp_struct old_info;
1447         unsigned int change_irq;
1448         int retval = 0;
1449         struct esp_struct *current_async;
1450
1451         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1452                 return -EFAULT;
1453         old_info = *info;
1454
1455         if ((new_serial.type != PORT_16550A) ||
1456             (new_serial.hub6) ||
1457             (info->port != new_serial.port) ||
1458             (new_serial.baud_base != BASE_BAUD) ||
1459             (new_serial.irq > 15) ||
1460             (new_serial.irq < 2) ||
1461             (new_serial.irq == 6) ||
1462             (new_serial.irq == 8) ||
1463             (new_serial.irq == 13))
1464                 return -EINVAL;
1465
1466         change_irq = new_serial.irq != info->irq;
1467
1468         if (change_irq && (info->line % 8))
1469                 return -EINVAL;
1470
1471         if (!capable(CAP_SYS_ADMIN)) {
1472                 if (change_irq || 
1473                     (new_serial.close_delay != info->close_delay) ||
1474                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1475                      (info->flags & ~ASYNC_USR_MASK)))
1476                         return -EPERM;
1477                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1478                                (new_serial.flags & ASYNC_USR_MASK));
1479                 info->custom_divisor = new_serial.custom_divisor;
1480         } else {
1481                 if (new_serial.irq == 2)
1482                         new_serial.irq = 9;
1483
1484                 if (change_irq) {
1485                         current_async = ports;
1486
1487                         while (current_async) {
1488                                 if ((current_async->line >= info->line) &&
1489                                     (current_async->line < (info->line + 8))) {
1490                                         if (current_async == info) {
1491                                                 if (current_async->count > 1)
1492                                                         return -EBUSY;
1493                                         } else if (current_async->count)
1494                                                 return -EBUSY;
1495                                 }
1496
1497                                 current_async = current_async->next_port;
1498                         }
1499                 }
1500
1501                 /*
1502                  * OK, past this point, all the error checking has been done.
1503                  * At this point, we start making changes.....
1504                  */
1505
1506                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1507                                (new_serial.flags & ASYNC_FLAGS));
1508                 info->custom_divisor = new_serial.custom_divisor;
1509                 info->close_delay = new_serial.close_delay * HZ/100;
1510                 info->closing_wait = new_serial.closing_wait * HZ/100;
1511
1512                 if (change_irq) {
1513                         /*
1514                          * We need to shutdown the serial port at the old
1515                          * port/irq combination.
1516                          */
1517                         shutdown(info);
1518
1519                         current_async = ports;
1520
1521                         while (current_async) {
1522                                 if ((current_async->line >= info->line) &&
1523                                     (current_async->line < (info->line + 8)))
1524                                         current_async->irq = new_serial.irq;
1525
1526                                 current_async = current_async->next_port;
1527                         }
1528
1529                         serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1530                         if (info->irq == 9)
1531                                 serial_out(info, UART_ESI_CMD2, 0x02);
1532                         else
1533                                 serial_out(info, UART_ESI_CMD2, info->irq);
1534                 }
1535         }
1536
1537         if (info->flags & ASYNC_INITIALIZED) {
1538                 if (((old_info.flags & ASYNC_SPD_MASK) !=
1539                      (info->flags & ASYNC_SPD_MASK)) ||
1540                     (old_info.custom_divisor != info->custom_divisor)) {
1541                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1542                                 info->tty->alt_speed = 57600;
1543                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1544                                 info->tty->alt_speed = 115200;
1545                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1546                                 info->tty->alt_speed = 230400;
1547                         if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1548                                 info->tty->alt_speed = 460800;
1549                         change_speed(info);
1550                 }
1551         } else
1552                 retval = startup(info);
1553
1554         return retval;
1555 }
1556
1557 static int set_esp_config(struct esp_struct * info,
1558                           struct hayes_esp_config __user * new_info)
1559 {
1560         struct hayes_esp_config new_config;
1561         unsigned int change_dma;
1562         int retval = 0;
1563         struct esp_struct *current_async;
1564         unsigned long flags;
1565
1566         /* Perhaps a non-sysadmin user should be able to do some of these */
1567         /* operations.  I haven't decided yet. */
1568
1569         if (!capable(CAP_SYS_ADMIN))
1570                 return -EPERM;
1571
1572         if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1573                 return -EFAULT;
1574
1575         if ((new_config.flow_on >= new_config.flow_off) ||
1576             (new_config.rx_trigger < 1) ||
1577             (new_config.tx_trigger < 1) ||
1578             (new_config.flow_off < 1) ||
1579             (new_config.flow_on < 1) ||
1580             (new_config.rx_trigger > 1023) ||
1581             (new_config.tx_trigger > 1023) ||
1582             (new_config.flow_off > 1023) ||
1583             (new_config.flow_on > 1023) ||
1584             (new_config.pio_threshold < 0) ||
1585             (new_config.pio_threshold > 1024))
1586                 return -EINVAL;
1587
1588         if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1589                 new_config.dma_channel = 0;
1590
1591         if (info->stat_flags & ESP_STAT_NEVER_DMA)
1592                 change_dma = new_config.dma_channel;
1593         else
1594                 change_dma = (new_config.dma_channel != dma);
1595
1596         if (change_dma) {
1597                 if (new_config.dma_channel) {
1598                         /* PIO mode to DMA mode transition OR */
1599                         /* change current DMA channel */
1600                         
1601                         current_async = ports;
1602
1603                         while (current_async) {
1604                                 if (current_async == info) {
1605                                         if (current_async->count > 1)
1606                                                 return -EBUSY;
1607                                 } else if (current_async->count)
1608                                         return -EBUSY;
1609                                         
1610                                 current_async =
1611                                         current_async->next_port;
1612                         }
1613
1614                         shutdown(info);
1615                         dma = new_config.dma_channel;
1616                         info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1617                         
1618                         /* all ports must use the same DMA channel */
1619
1620                         spin_lock_irqsave(&info->lock, flags);
1621                         current_async = ports;
1622
1623                         while (current_async) {
1624                                 esp_basic_init(current_async);
1625                                 current_async = current_async->next_port;
1626                         }
1627                         spin_unlock_irqrestore(&info->lock, flags);
1628                 } else {
1629                         /* DMA mode to PIO mode only */
1630                         
1631                         if (info->count > 1)
1632                                 return -EBUSY;
1633
1634                         shutdown(info);
1635                         spin_lock_irqsave(&info->lock, flags);
1636                         info->stat_flags |= ESP_STAT_NEVER_DMA;
1637                         esp_basic_init(info);
1638                         spin_unlock_irqrestore(&info->lock, flags);
1639                 }
1640         }
1641
1642         info->config.pio_threshold = new_config.pio_threshold;
1643
1644         if ((new_config.flow_off != info->config.flow_off) ||
1645             (new_config.flow_on != info->config.flow_on)) {
1646                 unsigned long flags;
1647
1648                 info->config.flow_off = new_config.flow_off;
1649                 info->config.flow_on = new_config.flow_on;
1650
1651                 spin_lock_irqsave(&info->lock, flags);
1652                 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1653                 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1654                 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1655                 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1656                 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1657                 spin_unlock_irqrestore(&info->lock, flags);
1658         }
1659
1660         if ((new_config.rx_trigger != info->config.rx_trigger) ||
1661             (new_config.tx_trigger != info->config.tx_trigger)) {
1662                 unsigned long flags;
1663
1664                 info->config.rx_trigger = new_config.rx_trigger;
1665                 info->config.tx_trigger = new_config.tx_trigger;
1666                 spin_lock_irqsave(&info->lock, flags);
1667                 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1668                 serial_out(info, UART_ESI_CMD2,
1669                            new_config.rx_trigger >> 8);
1670                 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1671                 serial_out(info, UART_ESI_CMD2,
1672                            new_config.tx_trigger >> 8);
1673                 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1674                 spin_unlock_irqrestore(&info->lock, flags);
1675         }
1676
1677         if (new_config.rx_timeout != info->config.rx_timeout) {
1678                 unsigned long flags;
1679
1680                 info->config.rx_timeout = new_config.rx_timeout;
1681                 spin_lock_irqsave(&info->lock, flags);
1682
1683                 if (info->IER & UART_IER_RDI) {
1684                         serial_out(info, UART_ESI_CMD1,
1685                                    ESI_SET_RX_TIMEOUT);
1686                         serial_out(info, UART_ESI_CMD2,
1687                                    new_config.rx_timeout);
1688                 }
1689
1690                 spin_unlock_irqrestore(&info->lock, flags);
1691         }
1692
1693         if (!(info->flags & ASYNC_INITIALIZED))
1694                 retval = startup(info);
1695
1696         return retval;
1697 }
1698
1699 /*
1700  * get_lsr_info - get line status register info
1701  *
1702  * Purpose: Let user call ioctl() to get info when the UART physically
1703  *          is emptied.  On bus types like RS485, the transmitter must
1704  *          release the bus after transmitting. This must be done when
1705  *          the transmit shift register is empty, not be done when the
1706  *          transmit holding register is empty.  This functionality
1707  *          allows an RS485 driver to be written in user space. 
1708  */
1709 static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1710 {
1711         unsigned char status;
1712         unsigned int result;
1713         unsigned long flags;
1714
1715         spin_lock_irqsave(&info->lock, flags);
1716         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1717         status = serial_in(info, UART_ESI_STAT1);
1718         spin_unlock_irqrestore(&info->lock, flags);
1719         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1720         return put_user(result,value);
1721 }
1722
1723
1724 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1725 {
1726         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1727         unsigned char control, status;
1728         unsigned long flags;
1729
1730         if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1731                 return -ENODEV;
1732         if (tty->flags & (1 << TTY_IO_ERROR))
1733                 return -EIO;
1734
1735         control = info->MCR;
1736
1737         spin_lock_irqsave(&info->lock, flags);
1738         serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1739         status = serial_in(info, UART_ESI_STAT2);
1740         spin_unlock_irqrestore(&info->lock, flags);
1741
1742         return    ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1743                 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1744                 | ((status  & UART_MSR_DCD) ? TIOCM_CAR : 0)
1745                 | ((status  & UART_MSR_RI) ? TIOCM_RNG : 0)
1746                 | ((status  & UART_MSR_DSR) ? TIOCM_DSR : 0)
1747                 | ((status  & UART_MSR_CTS) ? TIOCM_CTS : 0);
1748 }
1749
1750 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1751                         unsigned int set, unsigned int clear)
1752 {
1753         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1754         unsigned long flags;
1755
1756         if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1757                 return -ENODEV;
1758         if (tty->flags & (1 << TTY_IO_ERROR))
1759                 return -EIO;
1760
1761         spin_lock_irqsave(&info->lock, flags);
1762
1763         if (set & TIOCM_RTS)
1764                 info->MCR |= UART_MCR_RTS;
1765         if (set & TIOCM_DTR)
1766                 info->MCR |= UART_MCR_DTR;
1767
1768         if (clear & TIOCM_RTS)
1769                 info->MCR &= ~UART_MCR_RTS;
1770         if (clear & TIOCM_DTR)
1771                 info->MCR &= ~UART_MCR_DTR;
1772
1773         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1774         serial_out(info, UART_ESI_CMD2, UART_MCR);
1775         serial_out(info, UART_ESI_CMD2, info->MCR);
1776
1777         spin_unlock_irqrestore(&info->lock, flags);
1778         return 0;
1779 }
1780
1781 /*
1782  * rs_break() --- routine which turns the break handling on or off
1783  */
1784 static void esp_break(struct tty_struct *tty, int break_state)
1785 {
1786         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1787         unsigned long flags;
1788         
1789         if (serial_paranoia_check(info, tty->name, "esp_break"))
1790                 return;
1791
1792         if (break_state == -1) {
1793                 spin_lock_irqsave(&info->lock, flags);
1794                 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1795                 serial_out(info, UART_ESI_CMD2, 0x01);
1796                 spin_unlock_irqrestore(&info->lock, flags);
1797
1798                 /* FIXME - new style wait needed here */
1799                 interruptible_sleep_on(&info->break_wait);
1800         } else {
1801                 spin_lock_irqsave(&info->lock, flags);
1802                 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1803                 serial_out(info, UART_ESI_CMD2, 0x00);
1804                 spin_unlock_irqrestore(&info->lock, flags);
1805         }
1806 }
1807
1808 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1809                     unsigned int cmd, unsigned long arg)
1810 {
1811         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1812         struct async_icount cprev, cnow;        /* kernel counter temps */
1813         struct serial_icounter_struct __user *p_cuser;  /* user space */
1814         void __user *argp = (void __user *)arg;
1815         unsigned long flags;
1816
1817         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1818                 return -ENODEV;
1819
1820         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1821             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
1822             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1823             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1824             (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1825                 if (tty->flags & (1 << TTY_IO_ERROR))
1826                     return -EIO;
1827         }
1828         
1829         switch (cmd) {
1830                 case TIOCGSERIAL:
1831                         return get_serial_info(info, argp);
1832                 case TIOCSSERIAL:
1833                         return set_serial_info(info, argp);
1834                 case TIOCSERCONFIG:
1835                         /* do not reconfigure after initial configuration */
1836                         return 0;
1837
1838                 case TIOCSERGWILD:
1839                         return put_user(0L, (unsigned long __user *)argp);
1840
1841                 case TIOCSERGETLSR: /* Get line status register */
1842                             return get_lsr_info(info, argp);
1843
1844                 case TIOCSERSWILD:
1845                         if (!capable(CAP_SYS_ADMIN))
1846                                 return -EPERM;
1847                         return 0;
1848
1849                 /*
1850                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1851                  * - mask passed in arg for lines of interest
1852                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1853                  * Caller should use TIOCGICOUNT to see which one it was
1854                  */
1855                  case TIOCMIWAIT:
1856                         spin_lock_irqsave(&info->lock, flags);
1857                         cprev = info->icount;   /* note the counters on entry */
1858                         spin_unlock_irqrestore(&info->lock, flags);
1859                         while (1) {
1860                                 /* FIXME: convert to new style wakeup */
1861                                 interruptible_sleep_on(&info->delta_msr_wait);
1862                                 /* see if a signal did it */
1863                                 if (signal_pending(current))
1864                                         return -ERESTARTSYS;
1865                                 spin_lock_irqsave(&info->lock, flags);
1866                                 cnow = info->icount;    /* atomic copy */
1867                                 spin_unlock_irqrestore(&info->lock, flags);
1868                                 if (cnow.rng == cprev.rng &&
1869                                     cnow.dsr == cprev.dsr && 
1870                                     cnow.dcd == cprev.dcd &&
1871                                     cnow.cts == cprev.cts)
1872                                         return -EIO; /* no change => error */
1873                                 if (((arg & TIOCM_RNG) &&
1874                                      (cnow.rng != cprev.rng)) ||
1875                                      ((arg & TIOCM_DSR) &&
1876                                       (cnow.dsr != cprev.dsr)) ||
1877                                      ((arg & TIOCM_CD) &&
1878                                       (cnow.dcd != cprev.dcd)) ||
1879                                      ((arg & TIOCM_CTS) &&
1880                                       (cnow.cts != cprev.cts)) ) {
1881                                         return 0;
1882                                 }
1883                                 cprev = cnow;
1884                         }
1885                         /* NOTREACHED */
1886
1887                 /* 
1888                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1889                  * Return: write counters to the user passed counter struct
1890                  * NB: both 1->0 and 0->1 transitions are counted except for
1891                  *     RI where only 0->1 is counted.
1892                  */
1893                 case TIOCGICOUNT:
1894                         spin_lock_irqsave(&info->lock, flags);
1895                         cnow = info->icount;
1896                         spin_unlock_irqrestore(&info->lock, flags);
1897                         p_cuser = argp;
1898                         if (put_user(cnow.cts, &p_cuser->cts) ||
1899                             put_user(cnow.dsr, &p_cuser->dsr) ||
1900                             put_user(cnow.rng, &p_cuser->rng) ||
1901                             put_user(cnow.dcd, &p_cuser->dcd))
1902                                 return -EFAULT;
1903
1904                         return 0;
1905         case TIOCGHAYESESP:
1906                 return get_esp_config(info, argp);
1907         case TIOCSHAYESESP:
1908                 return set_esp_config(info, argp);
1909
1910                 default:
1911                         return -ENOIOCTLCMD;
1912                 }
1913         return 0;
1914 }
1915
1916 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1917 {
1918         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1919         unsigned long flags;
1920
1921         if (   (tty->termios->c_cflag == old_termios->c_cflag)
1922             && (   RELEVANT_IFLAG(tty->termios->c_iflag) 
1923                 == RELEVANT_IFLAG(old_termios->c_iflag)))
1924                 return;
1925
1926         change_speed(info);
1927
1928         spin_lock_irqsave(&info->lock, flags);
1929
1930         /* Handle transition to B0 status */
1931         if ((old_termios->c_cflag & CBAUD) &&
1932                 !(tty->termios->c_cflag & CBAUD)) {
1933                 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1934                 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1935                 serial_out(info, UART_ESI_CMD2, UART_MCR);
1936                 serial_out(info, UART_ESI_CMD2, info->MCR);
1937         }
1938
1939         /* Handle transition away from B0 status */
1940         if (!(old_termios->c_cflag & CBAUD) &&
1941                 (tty->termios->c_cflag & CBAUD)) {
1942                 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1943                 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1944                 serial_out(info, UART_ESI_CMD2, UART_MCR);
1945                 serial_out(info, UART_ESI_CMD2, info->MCR);
1946         }
1947
1948         spin_unlock_irqrestore(&info->lock, flags);
1949
1950         /* Handle turning of CRTSCTS */
1951         if ((old_termios->c_cflag & CRTSCTS) &&
1952             !(tty->termios->c_cflag & CRTSCTS)) {
1953                 rs_start(tty);
1954         }
1955 }
1956
1957 /*
1958  * ------------------------------------------------------------
1959  * rs_close()
1960  * 
1961  * This routine is called when the serial port gets closed.  First, we
1962  * wait for the last remaining data to be sent.  Then, we unlink its
1963  * async structure from the interrupt chain if necessary, and we free
1964  * that IRQ if nothing is left in the chain.
1965  * ------------------------------------------------------------
1966  */
1967 static void rs_close(struct tty_struct *tty, struct file * filp)
1968 {
1969         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1970         unsigned long flags;
1971
1972         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1973                 return;
1974         
1975         spin_lock_irqsave(&info->lock, flags);
1976         
1977         if (tty_hung_up_p(filp)) {
1978                 DBG_CNT("before DEC-hung");
1979                 goto out;
1980         }
1981         
1982 #ifdef SERIAL_DEBUG_OPEN
1983         printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1984 #endif
1985         if ((tty->count == 1) && (info->count != 1)) {
1986                 /*
1987                  * Uh, oh.  tty->count is 1, which means that the tty
1988                  * structure will be freed.  Info->count should always
1989                  * be one in these conditions.  If it's greater than
1990                  * one, we've got real problems, since it means the
1991                  * serial port won't be shutdown.
1992                  */
1993                 printk("rs_close: bad serial port count; tty->count is 1, "
1994                        "info->count is %d\n", info->count);
1995                 info->count = 1;
1996         }
1997         if (--info->count < 0) {
1998                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1999                        info->line, info->count);
2000                 info->count = 0;
2001         }
2002         if (info->count) {
2003                 DBG_CNT("before DEC-2");
2004                 goto out;
2005         }
2006         info->flags |= ASYNC_CLOSING;
2007
2008         spin_unlock_irqrestore(&info->lock, flags);
2009         /*
2010          * Now we wait for the transmit buffer to clear; and we notify 
2011          * the line discipline to only process XON/XOFF characters.
2012          */
2013         tty->closing = 1;
2014         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
2015                 tty_wait_until_sent(tty, info->closing_wait);
2016         /*
2017          * At this point we stop accepting input.  To do this, we
2018          * disable the receive line status interrupts, and tell the
2019          * interrupt driver to stop checking the data ready bit in the
2020          * line status register.
2021          */
2022         /* info->IER &= ~UART_IER_RLSI; */
2023         info->IER &= ~UART_IER_RDI;
2024         info->read_status_mask &= ~UART_LSR_DR;
2025         if (info->flags & ASYNC_INITIALIZED) {
2026
2027                 spin_lock_irqsave(&info->lock, flags);
2028                 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
2029                 serial_out(info, UART_ESI_CMD2, info->IER);
2030
2031                 /* disable receive timeout */
2032                 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
2033                 serial_out(info, UART_ESI_CMD2, 0x00);
2034
2035                 spin_unlock_irqrestore(&info->lock, flags);
2036
2037                 /*
2038                  * Before we drop DTR, make sure the UART transmitter
2039                  * has completely drained; this is especially
2040                  * important if there is a transmit FIFO!
2041                  */
2042                 rs_wait_until_sent(tty, info->timeout);
2043         }
2044         shutdown(info);
2045         if (tty->driver->flush_buffer)
2046                 tty->driver->flush_buffer(tty);
2047         tty_ldisc_flush(tty);
2048         tty->closing = 0;
2049         info->event = 0;
2050         info->tty = NULL;
2051
2052         if (info->blocked_open) {
2053                 if (info->close_delay) {
2054                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
2055                 }
2056                 wake_up_interruptible(&info->open_wait);
2057         }
2058         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2059         wake_up_interruptible(&info->close_wait);
2060         return;
2061
2062 out:
2063         spin_unlock_irqrestore(&info->lock, flags);
2064 }
2065
2066 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2067 {
2068         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2069         unsigned long orig_jiffies, char_time;
2070         unsigned long flags;
2071
2072         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2073                 return;
2074
2075         orig_jiffies = jiffies;
2076         char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2077
2078         if (!char_time)
2079                 char_time = 1;
2080
2081         spin_lock_irqsave(&info->lock, flags);
2082         serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2083         serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2084
2085         while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2086                 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2087
2088                 spin_unlock_irqrestore(&info->lock, flags);
2089                 msleep_interruptible(jiffies_to_msecs(char_time));
2090
2091                 if (signal_pending(current))
2092                         break;
2093
2094                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2095                         break;
2096
2097                 spin_lock_irqsave(&info->lock, flags);
2098                 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2099                 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2100         }
2101         spin_unlock_irqrestore(&info->lock, flags);
2102         set_current_state(TASK_RUNNING);
2103 }
2104
2105 /*
2106  * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2107  */
2108 static void esp_hangup(struct tty_struct *tty)
2109 {
2110         struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2111         
2112         if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2113                 return;
2114         
2115         rs_flush_buffer(tty);
2116         shutdown(info);
2117         info->event = 0;
2118         info->count = 0;
2119         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2120         info->tty = NULL;
2121         wake_up_interruptible(&info->open_wait);
2122 }
2123
2124 /*
2125  * ------------------------------------------------------------
2126  * esp_open() and friends
2127  * ------------------------------------------------------------
2128  */
2129 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2130                            struct esp_struct *info)
2131 {
2132         DECLARE_WAITQUEUE(wait, current);
2133         int             retval;
2134         int             do_clocal = 0;
2135         unsigned long   flags;
2136
2137         /*
2138          * If the device is in the middle of being closed, then block
2139          * until it's done, and then try again.
2140          */
2141         if (tty_hung_up_p(filp) ||
2142             (info->flags & ASYNC_CLOSING)) {
2143                 if (info->flags & ASYNC_CLOSING)
2144                         interruptible_sleep_on(&info->close_wait);
2145 #ifdef SERIAL_DO_RESTART
2146                 if (info->flags & ASYNC_HUP_NOTIFY)
2147                         return -EAGAIN;
2148                 else
2149                         return -ERESTARTSYS;
2150 #else
2151                 return -EAGAIN;
2152 #endif
2153         }
2154
2155         /*
2156          * If non-blocking mode is set, or the port is not enabled,
2157          * then make the check up front and then exit.
2158          */
2159         if ((filp->f_flags & O_NONBLOCK) ||
2160             (tty->flags & (1 << TTY_IO_ERROR))) {
2161                 info->flags |= ASYNC_NORMAL_ACTIVE;
2162                 return 0;
2163         }
2164
2165         if (tty->termios->c_cflag & CLOCAL)
2166                 do_clocal = 1;
2167
2168         /*
2169          * Block waiting for the carrier detect and the line to become
2170          * free (i.e., not in use by the callout).  While we are in
2171          * this loop, info->count is dropped by one, so that
2172          * rs_close() knows when to free things.  We restore it upon
2173          * exit, either normal or abnormal.
2174          */
2175         retval = 0;
2176         add_wait_queue(&info->open_wait, &wait);
2177 #ifdef SERIAL_DEBUG_OPEN
2178         printk("block_til_ready before block: ttys%d, count = %d\n",
2179                info->line, info->count);
2180 #endif
2181         spin_lock_irqsave(&info->lock, flags);
2182         if (!tty_hung_up_p(filp)) 
2183                 info->count--;
2184         info->blocked_open++;
2185         while (1) {
2186                 if ((tty->termios->c_cflag & CBAUD)) {
2187                         unsigned int scratch;
2188
2189                         serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2190                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2191                         scratch = serial_in(info, UART_ESI_STAT1);
2192                         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2193                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2194                         serial_out(info, UART_ESI_CMD2,
2195                                 scratch | UART_MCR_DTR | UART_MCR_RTS);
2196                 }
2197                 set_current_state(TASK_INTERRUPTIBLE);
2198                 if (tty_hung_up_p(filp) ||
2199                     !(info->flags & ASYNC_INITIALIZED)) {
2200 #ifdef SERIAL_DO_RESTART
2201                         if (info->flags & ASYNC_HUP_NOTIFY)
2202                                 retval = -EAGAIN;
2203                         else
2204                                 retval = -ERESTARTSYS;  
2205 #else
2206                         retval = -EAGAIN;
2207 #endif
2208                         break;
2209                 }
2210
2211                 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2212                 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2213                         do_clocal = 1;
2214
2215                 if (!(info->flags & ASYNC_CLOSING) &&
2216                     (do_clocal))
2217                         break;
2218                 if (signal_pending(current)) {
2219                         retval = -ERESTARTSYS;
2220                         break;
2221                 }
2222 #ifdef SERIAL_DEBUG_OPEN
2223                 printk("block_til_ready blocking: ttys%d, count = %d\n",
2224                        info->line, info->count);
2225 #endif
2226                 spin_unlock_irqrestore(&info->lock, flags);
2227                 schedule();
2228                 spin_lock_irqsave(&info->lock, flags);
2229         }
2230         set_current_state(TASK_RUNNING);
2231         remove_wait_queue(&info->open_wait, &wait);
2232         if (!tty_hung_up_p(filp))
2233                 info->count++;
2234         info->blocked_open--;
2235         spin_unlock_irqrestore(&info->lock, flags);
2236 #ifdef SERIAL_DEBUG_OPEN
2237         printk("block_til_ready after blocking: ttys%d, count = %d\n",
2238                info->line, info->count);
2239 #endif
2240         if (retval)
2241                 return retval;
2242         info->flags |= ASYNC_NORMAL_ACTIVE;
2243         return 0;
2244 }       
2245
2246 /*
2247  * This routine is called whenever a serial port is opened.  It
2248  * enables interrupts for a serial port, linking in its async structure into
2249  * the IRQ chain.   It also performs the serial-specific
2250  * initialization for the tty structure.
2251  */
2252 static int esp_open(struct tty_struct *tty, struct file * filp)
2253 {
2254         struct esp_struct       *info;
2255         int                     retval, line;
2256         unsigned long           flags;
2257
2258         line = tty->index;
2259         if ((line < 0) || (line >= NR_PORTS))
2260                 return -ENODEV;
2261
2262         /* find the port in the chain */
2263
2264         info = ports;
2265
2266         while (info && (info->line != line))
2267                 info = info->next_port;
2268
2269         if (!info) {
2270                 serial_paranoia_check(info, tty->name, "esp_open");
2271                 return -ENODEV;
2272         }
2273
2274 #ifdef SERIAL_DEBUG_OPEN
2275         printk("esp_open %s, count = %d\n", tty->name, info->count);
2276 #endif
2277         spin_lock_irqsave(&info->lock, flags);
2278         info->count++;
2279         tty->driver_data = info;
2280         info->tty = tty;
2281
2282         spin_unlock_irqrestore(&info->lock, flags);
2283         
2284         /*
2285          * Start up serial port
2286          */
2287         retval = startup(info);
2288         if (retval)
2289                 return retval;
2290
2291         retval = block_til_ready(tty, filp, info);
2292         if (retval) {
2293 #ifdef SERIAL_DEBUG_OPEN
2294                 printk("esp_open returning after block_til_ready with %d\n",
2295                        retval);
2296 #endif
2297                 return retval;
2298         }
2299
2300 #ifdef SERIAL_DEBUG_OPEN
2301         printk("esp_open %s successful...", tty->name);
2302 #endif
2303         return 0;
2304 }
2305
2306 /*
2307  * ---------------------------------------------------------------------
2308  * espserial_init() and friends
2309  *
2310  * espserial_init() is called at boot-time to initialize the serial driver.
2311  * ---------------------------------------------------------------------
2312  */
2313
2314 /*
2315  * This routine prints out the appropriate serial driver version
2316  * number, and identifies which options were configured into this
2317  * driver.
2318  */
2319  
2320 static inline void show_serial_version(void)
2321 {
2322         printk(KERN_INFO "%s version %s (DMA %u)\n",
2323                 serial_name, serial_version, dma);
2324 }
2325
2326 /*
2327  * This routine is called by espserial_init() to initialize a specific serial
2328  * port.
2329  */
2330 static inline int autoconfig(struct esp_struct * info)
2331 {
2332         int port_detected = 0;
2333         unsigned long flags;
2334
2335         if (!request_region(info->port, REGION_SIZE, "esp serial"))
2336                 return -EIO;
2337
2338         spin_lock_irqsave(&info->lock, flags);
2339         /*
2340          * Check for ESP card
2341          */
2342
2343         if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2344                 serial_out(info, UART_ESI_CMD1, 0x00);
2345                 serial_out(info, UART_ESI_CMD1, 0x01);
2346
2347                 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2348                         port_detected = 1;
2349
2350                         if (!(info->irq)) {
2351                                 serial_out(info, UART_ESI_CMD1, 0x02);
2352
2353                                 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2354                                         info->irq = 3;
2355                                 else
2356                                         info->irq = 4;
2357                         }
2358
2359
2360                         /* put card in enhanced mode */
2361                         /* this prevents access through */
2362                         /* the "old" IO ports */
2363                         esp_basic_init(info);
2364
2365                         /* clear out MCR */
2366                         serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2367                         serial_out(info, UART_ESI_CMD2, UART_MCR);
2368                         serial_out(info, UART_ESI_CMD2, 0x00);
2369                 }
2370         }
2371         if (!port_detected)
2372                 release_region(info->port, REGION_SIZE);
2373
2374         spin_unlock_irqrestore(&info->lock, flags);
2375         return (port_detected);
2376 }
2377
2378 static const struct tty_operations esp_ops = {
2379         .open = esp_open,
2380         .close = rs_close,
2381         .write = rs_write,
2382         .put_char = rs_put_char,
2383         .flush_chars = rs_flush_chars,
2384         .write_room = rs_write_room,
2385         .chars_in_buffer = rs_chars_in_buffer,
2386         .flush_buffer = rs_flush_buffer,
2387         .ioctl = rs_ioctl,
2388         .throttle = rs_throttle,
2389         .unthrottle = rs_unthrottle,
2390         .set_termios = rs_set_termios,
2391         .stop = rs_stop,
2392         .start = rs_start,
2393         .hangup = esp_hangup,
2394         .break_ctl = esp_break,
2395         .wait_until_sent = rs_wait_until_sent,
2396         .tiocmget = esp_tiocmget,
2397         .tiocmset = esp_tiocmset,
2398 };
2399
2400 /*
2401  * The serial driver boot-time initialization code!
2402  */
2403 static int __init espserial_init(void)
2404 {
2405         int i, offset;
2406         struct esp_struct * info;
2407         struct esp_struct *last_primary = NULL;
2408         int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2409
2410         esp_driver = alloc_tty_driver(NR_PORTS);
2411         if (!esp_driver)
2412                 return -ENOMEM;
2413         
2414         for (i = 0; i < NR_PRIMARY; i++) {
2415                 if (irq[i] != 0) {
2416                         if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2417                             (irq[i] == 8) || (irq[i] == 13))
2418                                 irq[i] = 0;
2419                         else if (irq[i] == 2)
2420                                 irq[i] = 9;
2421                 }
2422         }
2423
2424         if ((dma != 1) && (dma != 3))
2425                 dma = 0;
2426
2427         if ((rx_trigger < 1) || (rx_trigger > 1023))
2428                 rx_trigger = 768;
2429
2430         if ((tx_trigger < 1) || (tx_trigger > 1023))
2431                 tx_trigger = 768;
2432
2433         if ((flow_off < 1) || (flow_off > 1023))
2434                 flow_off = 1016;
2435         
2436         if ((flow_on < 1) || (flow_on > 1023))
2437                 flow_on = 944;
2438
2439         if ((rx_timeout < 0) || (rx_timeout > 255))
2440                 rx_timeout = 128;
2441         
2442         if (flow_on >= flow_off)
2443                 flow_on = flow_off - 1;
2444
2445         show_serial_version();
2446
2447         /* Initialize the tty_driver structure */
2448         
2449         esp_driver->owner = THIS_MODULE;
2450         esp_driver->name = "ttyP";
2451         esp_driver->major = ESP_IN_MAJOR;
2452         esp_driver->minor_start = 0;
2453         esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2454         esp_driver->subtype = SERIAL_TYPE_NORMAL;
2455         esp_driver->init_termios = tty_std_termios;
2456         esp_driver->init_termios.c_cflag =
2457                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2458         esp_driver->flags = TTY_DRIVER_REAL_RAW;
2459         tty_set_operations(esp_driver, &esp_ops);
2460         if (tty_register_driver(esp_driver))
2461         {
2462                 printk(KERN_ERR "Couldn't register esp serial driver");
2463                 put_tty_driver(esp_driver);
2464                 return 1;
2465         }
2466
2467         info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2468
2469         if (!info)
2470         {
2471                 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2472                 tty_unregister_driver(esp_driver);
2473                 put_tty_driver(esp_driver);
2474                 return 1;
2475         }
2476
2477         memset((void *)info, 0, sizeof(struct esp_struct));
2478         spin_lock_init(&info->lock);
2479         /* rx_trigger, tx_trigger are needed by autoconfig */
2480         info->config.rx_trigger = rx_trigger;
2481         info->config.tx_trigger = tx_trigger;
2482
2483         i = 0;
2484         offset = 0;
2485
2486         do {
2487                 info->port = esp[i] + offset;
2488                 info->irq = irq[i];
2489                 info->line = (i * 8) + (offset / 8);
2490
2491                 if (!autoconfig(info)) {
2492                         i++;
2493                         offset = 0;
2494                         continue;
2495                 }
2496
2497                 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2498                 info->flags = STD_COM_FLAGS;
2499                 if (info->custom_divisor)
2500                         info->flags |= ASYNC_SPD_CUST;
2501                 info->magic = ESP_MAGIC;
2502                 info->close_delay = 5*HZ/10;
2503                 info->closing_wait = 30*HZ;
2504                 INIT_WORK(&info->tqueue, do_softint, info);
2505                 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
2506                 info->config.rx_timeout = rx_timeout;
2507                 info->config.flow_on = flow_on;
2508                 info->config.flow_off = flow_off;
2509                 info->config.pio_threshold = pio_threshold;
2510                 info->next_port = ports;
2511                 init_waitqueue_head(&info->open_wait);
2512                 init_waitqueue_head(&info->close_wait);
2513                 init_waitqueue_head(&info->delta_msr_wait);
2514                 init_waitqueue_head(&info->break_wait);
2515                 ports = info;
2516                 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2517                         info->line, info->port, info->irq);
2518
2519                 if (info->line % 8) {
2520                         printk("secondary port\n");
2521                         /* 8 port cards can't do DMA */
2522                         info->stat_flags |= ESP_STAT_NEVER_DMA;
2523
2524                         if (last_primary)
2525                                 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2526                 } else {
2527                         printk("primary port\n");
2528                         last_primary = info;
2529                         irq[i] = info->irq;
2530                 }
2531
2532                 if (!dma)
2533                         info->stat_flags |= ESP_STAT_NEVER_DMA;
2534
2535                 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2536                 if (!info)
2537                 {
2538                         printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); 
2539
2540                         /* allow use of the already detected ports */
2541                         return 0;
2542                 }
2543
2544                 memset((void *)info, 0, sizeof(struct esp_struct));
2545                 /* rx_trigger, tx_trigger are needed by autoconfig */
2546                 info->config.rx_trigger = rx_trigger;
2547                 info->config.tx_trigger = tx_trigger;
2548
2549                 if (offset == 56) {
2550                         i++;
2551                         offset = 0;
2552                 } else {
2553                         offset += 8;
2554                 }
2555         } while (i < NR_PRIMARY);
2556
2557         /* free the last port memory allocation */
2558         kfree(info);
2559
2560         return 0;
2561 }
2562
2563 static void __exit espserial_exit(void) 
2564 {
2565         int e1;
2566         struct esp_struct *temp_async;
2567         struct esp_pio_buffer *pio_buf;
2568
2569         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2570         if ((e1 = tty_unregister_driver(esp_driver)))
2571                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2572                        e1);
2573         put_tty_driver(esp_driver);
2574
2575         while (ports) {
2576                 if (ports->port) {
2577                         release_region(ports->port, REGION_SIZE);
2578                 }
2579                 temp_async = ports->next_port;
2580                 kfree(ports);
2581                 ports = temp_async;
2582         }
2583
2584         if (dma_buffer)
2585                 free_pages((unsigned long)dma_buffer,
2586                         get_order(DMA_BUFFER_SZ));
2587
2588         while (free_pio_buf) {
2589                 pio_buf = free_pio_buf->next;
2590                 kfree(free_pio_buf);
2591                 free_pio_buf = pio_buf;
2592         }
2593 }
2594
2595 module_init(espserial_init);
2596 module_exit(espserial_exit);