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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / char / esp.c
blobd67098c45ffd4d8d0b0d84ac84bcdad2fc7b818c
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
61 #include <asm/system.h>
62 #include <asm/io.h>
63 #include <asm/bitops.h>
64
65 #include <asm/dma.h>
66 #include <linux/slab.h>
67 #include <asm/uaccess.h>
68
69 #include <linux/hayesesp.h>
70
71 #define NR_PORTS 64 /* maximum number of ports */
72 #define NR_PRIMARY 8 /* maximum number of primary ports */
73
74 /* The following variables can be set by giving module options */
75 static int irq[NR_PRIMARY]; /* IRQ for each base port */
76 static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
77 static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
78 static unsigned int rx_trigger = ESP_RX_TRIGGER;
79 static unsigned int tx_trigger = ESP_TX_TRIGGER;
80 static unsigned int flow_off = ESP_FLOW_OFF;
81 static unsigned int flow_on = ESP_FLOW_ON;
82 static unsigned int rx_timeout = ESP_RX_TMOUT;
83 static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
84
85 MODULE_LICENSE("GPL");
86
87 MODULE_PARM(irq, "1-8i");
88 MODULE_PARM(divisor, "1-8i");
89 MODULE_PARM(dma, "i");
90 MODULE_PARM(rx_trigger, "i");
91 MODULE_PARM(tx_trigger, "i");
92 MODULE_PARM(flow_off, "i");
93 MODULE_PARM(flow_on, "i");
94 MODULE_PARM(rx_timeout, "i");
95 MODULE_PARM(pio_threshold, "i");
96
97 /* END */
98
99 static char *dma_buffer;
100 static int dma_bytes;
101 static struct esp_pio_buffer *free_pio_buf;
102
103 #define DMA_BUFFER_SZ 1024
104
105 #define WAKEUP_CHARS 1024
106
107 static char serial_name[] __initdata = "ESP serial driver";
108 static char serial_version[] __initdata = "2.2";
109
110 static struct tty_driver *esp_driver;
111
112 /* serial subtype definitions */
113 #define SERIAL_TYPE_NORMAL 1
114
115 /*
116 * Serial driver configuration section. Here are the various options:
117 *
118 * SERIAL_PARANOIA_CHECK
119 * Check the magic number for the esp_structure where
120 * ever possible.
121 */
122
123 #undef SERIAL_PARANOIA_CHECK
124 #define SERIAL_DO_RESTART
125
126 #undef SERIAL_DEBUG_INTR
127 #undef SERIAL_DEBUG_OPEN
128 #undef SERIAL_DEBUG_FLOW
129
130 #define _INLINE_ inline
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 /*
154 * tmp_buf is used as a temporary buffer by serial_write. We need to
155 * lock it in case the memcpy_fromfs blocks while swapping in a page,
156 * and some other program tries to do a serial write at the same time.
157 * Since the lock will only come under contention when the system is
158 * swapping and available memory is low, it makes sense to share one
159 * buffer across all the serial ports, since it significantly saves
160 * memory if large numbers of serial ports are open.
161 */
162 static unsigned char *tmp_buf;
163 static DECLARE_MUTEX(tmp_buf_sem);
164
165 static inline int serial_paranoia_check(struct esp_struct *info,
166 char *name, const char *routine)
167 {
168 #ifdef SERIAL_PARANOIA_CHECK
169 static const char badmagic[] = KERN_WARNING
170 "Warning: bad magic number for serial struct (%s) in %s\n";
171 static const char badinfo[] = KERN_WARNING
172 "Warning: null esp_struct for (%s) in %s\n";
173
174 if (!info) {
175 printk(badinfo, name, routine);
176 return 1;
177 }
178 if (info->magic != ESP_MAGIC) {
179 printk(badmagic, name, routine);
180 return 1;
181 }
182 #endif
183 return 0;
184 }
185
186 static inline unsigned int serial_in(struct esp_struct *info, int offset)
187 {
188 return inb(info->port + offset);
189 }
190
191 static inline void serial_out(struct esp_struct *info, int offset,
192 unsigned char value)
193 {
194 outb(value, info->port+offset);
195 }
196
197 /*
198 * ------------------------------------------------------------
199 * rs_stop() and rs_start()
200 *
201 * This routines are called before setting or resetting tty->stopped.
202 * They enable or disable transmitter interrupts, as necessary.
203 * ------------------------------------------------------------
204 */
205 static void rs_stop(struct tty_struct *tty)
206 {
207 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
208 unsigned long flags;
209
210 if (serial_paranoia_check(info, tty->name, "rs_stop"))
211 return;
212
213 save_flags(flags); cli();
214 if (info->IER & UART_IER_THRI) {
215 info->IER &= ~UART_IER_THRI;
216 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
217 serial_out(info, UART_ESI_CMD2, info->IER);
218 }
219
220 restore_flags(flags);
221 }
222
223 static void rs_start(struct tty_struct *tty)
224 {
225 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
226 unsigned long flags;
227
228 if (serial_paranoia_check(info, tty->name, "rs_start"))
229 return;
230
231 save_flags(flags); cli();
232 if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
233 info->IER |= UART_IER_THRI;
234 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
235 serial_out(info, UART_ESI_CMD2, info->IER);
236 }
237 restore_flags(flags);
238 }
239
240 /*
241 * ----------------------------------------------------------------------
242 *
243 * Here starts the interrupt handling routines. All of the following
244 * subroutines are declared as inline and are folded into
245 * rs_interrupt(). They were separated out for readability's sake.
246 *
247 * Note: rs_interrupt() is a "fast" interrupt, which means that it
248 * runs with interrupts turned off. People who may want to modify
249 * rs_interrupt() should try to keep the interrupt handler as fast as
250 * possible. After you are done making modifications, it is not a bad
251 * idea to do:
252 *
253 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
254 *
255 * and look at the resulting assemble code in serial.s.
256 *
257 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
258 * -----------------------------------------------------------------------
259 */
260
261 /*
262 * This routine is used by the interrupt handler to schedule
263 * processing in the software interrupt portion of the driver.
264 */
265 static _INLINE_ void rs_sched_event(struct esp_struct *info,
266 int event)
267 {
268 info->event |= 1 << event;
269 schedule_work(&info->tqueue);
270 }
271
272 static _INLINE_ struct esp_pio_buffer *get_pio_buffer(void)
273 {
274 struct esp_pio_buffer *buf;
275
276 if (free_pio_buf) {
277 buf = free_pio_buf;
278 free_pio_buf = buf->next;
279 } else {
280 buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
281 }
282
283 return buf;
284 }
285
286 static _INLINE_ void release_pio_buffer(struct esp_pio_buffer *buf)
287 {
288 buf->next = free_pio_buf;
289 free_pio_buf = buf;
290 }
291
292 static _INLINE_ void receive_chars_pio(struct esp_struct *info, int num_bytes)
293 {
294 struct tty_struct *tty = info->tty;
295 int i;
296 struct esp_pio_buffer *pio_buf;
297 struct esp_pio_buffer *err_buf;
298 unsigned char status_mask;
299
300 pio_buf = get_pio_buffer();
301
302 if (!pio_buf)
303 return;
304
305 err_buf = get_pio_buffer();
306
307 if (!err_buf) {
308 release_pio_buffer(pio_buf);
309 return;
310 }
311
312 sti();
313
314 status_mask = (info->read_status_mask >> 2) & 0x07;
315
316 for (i = 0; i < num_bytes - 1; i += 2) {
317 *((unsigned short *)(pio_buf->data + i)) =
318 inw(info->port + UART_ESI_RX);
319 err_buf->data[i] = serial_in(info, UART_ESI_RWS);
320 err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
321 err_buf->data[i] &= status_mask;
322 }
323
324 if (num_bytes & 0x0001) {
325 pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
326 err_buf->data[num_bytes - 1] =
327 (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
328 }
329
330 cli();
331
332 /* make sure everything is still ok since interrupts were enabled */
333 tty = info->tty;
334
335 if (!tty) {
336 release_pio_buffer(pio_buf);
337 release_pio_buffer(err_buf);
338 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
339 return;
340 }
341
342 status_mask = (info->ignore_status_mask >> 2) & 0x07;
343
344 for (i = 0; i < num_bytes; i++) {
345 if (!(err_buf->data[i] & status_mask)) {
346 *(tty->flip.char_buf_ptr++) = pio_buf->data[i];
347
348 if (err_buf->data[i] & 0x04) {
349 *(tty->flip.flag_buf_ptr++) = TTY_BREAK;
350
351 if (info->flags & ASYNC_SAK)
352 do_SAK(tty);
353 }
354 else if (err_buf->data[i] & 0x02)
355 *(tty->flip.flag_buf_ptr++) = TTY_FRAME;
356 else if (err_buf->data[i] & 0x01)
357 *(tty->flip.flag_buf_ptr++) = TTY_PARITY;
358 else
359 *(tty->flip.flag_buf_ptr++) = 0;
360
361 tty->flip.count++;
362 }
363 }
364
365 schedule_delayed_work(&tty->flip.work, 1);
366
367 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
368 release_pio_buffer(pio_buf);
369 release_pio_buffer(err_buf);
370 }
371
372 static _INLINE_ void receive_chars_dma(struct esp_struct *info, int num_bytes)
373 {
374 unsigned long flags;
375 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
376 dma_bytes = num_bytes;
377 info->stat_flags |= ESP_STAT_DMA_RX;
378
379 flags=claim_dma_lock();
380 disable_dma(dma);
381 clear_dma_ff(dma);
382 set_dma_mode(dma, DMA_MODE_READ);
383 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
384 set_dma_count(dma, dma_bytes);
385 enable_dma(dma);
386 release_dma_lock(flags);
387
388 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
389 }
390
391 static _INLINE_ void receive_chars_dma_done(struct esp_struct *info,
392 int status)
393 {
394 struct tty_struct *tty = info->tty;
395 int num_bytes;
396 unsigned long flags;
397
398
399 flags=claim_dma_lock();
400 disable_dma(dma);
401 clear_dma_ff(dma);
402
403 info->stat_flags &= ~ESP_STAT_DMA_RX;
404 num_bytes = dma_bytes - get_dma_residue(dma);
405 release_dma_lock(flags);
406
407 info->icount.rx += num_bytes;
408
409 memcpy(tty->flip.char_buf_ptr, dma_buffer, num_bytes);
410 tty->flip.char_buf_ptr += num_bytes;
411 tty->flip.count += num_bytes;
412 memset(tty->flip.flag_buf_ptr, 0, num_bytes);
413 tty->flip.flag_buf_ptr += num_bytes;
414
415 if (num_bytes > 0) {
416 tty->flip.flag_buf_ptr--;
417
418 status &= (0x1c & info->read_status_mask);
419
420 if (status & info->ignore_status_mask) {
421 tty->flip.count--;
422 tty->flip.char_buf_ptr--;
423 tty->flip.flag_buf_ptr--;
424 } else if (status & 0x10) {
425 *tty->flip.flag_buf_ptr = TTY_BREAK;
426 (info->icount.brk)++;
427 if (info->flags & ASYNC_SAK)
428 do_SAK(tty);
429 } else if (status & 0x08) {
430 *tty->flip.flag_buf_ptr = TTY_FRAME;
431 (info->icount.frame)++;
432 }
433 else if (status & 0x04) {
434 *tty->flip.flag_buf_ptr = TTY_PARITY;
435 (info->icount.parity)++;
436 }
437
438 tty->flip.flag_buf_ptr++;
439
440 schedule_delayed_work(&tty->flip.work, 1);
441 }
442
443 if (dma_bytes != num_bytes) {
444 num_bytes = dma_bytes - num_bytes;
445 dma_bytes = 0;
446 receive_chars_dma(info, num_bytes);
447 } else
448 dma_bytes = 0;
449 }
450
451 static _INLINE_ void transmit_chars_pio(struct esp_struct *info,
452 int space_avail)
453 {
454 int i;
455 struct esp_pio_buffer *pio_buf;
456
457 pio_buf = get_pio_buffer();
458
459 if (!pio_buf)
460 return;
461
462 while (space_avail && info->xmit_cnt) {
463 if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
464 memcpy(pio_buf->data,
465 &(info->xmit_buf[info->xmit_tail]),
466 space_avail);
467 } else {
468 i = ESP_XMIT_SIZE - info->xmit_tail;
469 memcpy(pio_buf->data,
470 &(info->xmit_buf[info->xmit_tail]), i);
471 memcpy(&(pio_buf->data[i]), info->xmit_buf,
472 space_avail - i);
473 }
474
475 info->xmit_cnt -= space_avail;
476 info->xmit_tail = (info->xmit_tail + space_avail) &
477 (ESP_XMIT_SIZE - 1);
478
479 sti();
480
481 for (i = 0; i < space_avail - 1; i += 2) {
482 outw(*((unsigned short *)(pio_buf->data + i)),
483 info->port + UART_ESI_TX);
484 }
485
486 if (space_avail & 0x0001)
487 serial_out(info, UART_ESI_TX,
488 pio_buf->data[space_avail - 1]);
489
490 cli();
491
492 if (info->xmit_cnt) {
493 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
494 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
495 space_avail = serial_in(info, UART_ESI_STAT1) << 8;
496 space_avail |= serial_in(info, UART_ESI_STAT2);
497
498 if (space_avail > info->xmit_cnt)
499 space_avail = info->xmit_cnt;
500 }
501 }
502
503 if (info->xmit_cnt < WAKEUP_CHARS) {
504 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
505
506 #ifdef SERIAL_DEBUG_INTR
507 printk("THRE...");
508 #endif
509
510 if (info->xmit_cnt <= 0) {
511 info->IER &= ~UART_IER_THRI;
512 serial_out(info, UART_ESI_CMD1,
513 ESI_SET_SRV_MASK);
514 serial_out(info, UART_ESI_CMD2, info->IER);
515 }
516 }
517
518 release_pio_buffer(pio_buf);
519 }
520
521 static _INLINE_ void transmit_chars_dma(struct esp_struct *info, int num_bytes)
522 {
523 unsigned long flags;
524
525 dma_bytes = num_bytes;
526
527 if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
528 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
529 dma_bytes);
530 } else {
531 int i = ESP_XMIT_SIZE - info->xmit_tail;
532 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
533 i);
534 memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
535 }
536
537 info->xmit_cnt -= dma_bytes;
538 info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
539
540 if (info->xmit_cnt < WAKEUP_CHARS) {
541 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
542
543 #ifdef SERIAL_DEBUG_INTR
544 printk("THRE...");
545 #endif
546
547 if (info->xmit_cnt <= 0) {
548 info->IER &= ~UART_IER_THRI;
549 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
550 serial_out(info, UART_ESI_CMD2, info->IER);
551 }
552 }
553
554 info->stat_flags |= ESP_STAT_DMA_TX;
555
556 flags=claim_dma_lock();
557 disable_dma(dma);
558 clear_dma_ff(dma);
559 set_dma_mode(dma, DMA_MODE_WRITE);
560 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
561 set_dma_count(dma, dma_bytes);
562 enable_dma(dma);
563 release_dma_lock(flags);
564
565 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
566 }
567
568 static _INLINE_ void transmit_chars_dma_done(struct esp_struct *info)
569 {
570 int num_bytes;
571 unsigned long flags;
572
573
574 flags=claim_dma_lock();
575 disable_dma(dma);
576 clear_dma_ff(dma);
577
578 num_bytes = dma_bytes - get_dma_residue(dma);
579 info->icount.tx += dma_bytes;
580 release_dma_lock(flags);
581
582 if (dma_bytes != num_bytes) {
583 dma_bytes -= num_bytes;
584 memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
585
586 flags=claim_dma_lock();
587 disable_dma(dma);
588 clear_dma_ff(dma);
589 set_dma_mode(dma, DMA_MODE_WRITE);
590 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
591 set_dma_count(dma, dma_bytes);
592 enable_dma(dma);
593 release_dma_lock(flags);
594
595 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
596 } else {
597 dma_bytes = 0;
598 info->stat_flags &= ~ESP_STAT_DMA_TX;
599 }
600 }
601
602 static _INLINE_ void check_modem_status(struct esp_struct *info)
603 {
604 int status;
605
606 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
607 status = serial_in(info, UART_ESI_STAT2);
608
609 if (status & UART_MSR_ANY_DELTA) {
610 /* update input line counters */
611 if (status & UART_MSR_TERI)
612 info->icount.rng++;
613 if (status & UART_MSR_DDSR)
614 info->icount.dsr++;
615 if (status & UART_MSR_DDCD)
616 info->icount.dcd++;
617 if (status & UART_MSR_DCTS)
618 info->icount.cts++;
619 wake_up_interruptible(&info->delta_msr_wait);
620 }
621
622 if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
623 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
624 printk("ttys%d CD now %s...", info->line,
625 (status & UART_MSR_DCD) ? "on" : "off");
626 #endif
627 if (status & UART_MSR_DCD)
628 wake_up_interruptible(&info->open_wait);
629 else {
630 #ifdef SERIAL_DEBUG_OPEN
631 printk("scheduling hangup...");
632 #endif
633 schedule_work(&info->tqueue_hangup);
634 }
635 }
636 }
637
638 /*
639 * This is the serial driver's interrupt routine
640 */
641 static irqreturn_t rs_interrupt_single(int irq, void *dev_id,
642 struct pt_regs *regs)
643 {
644 struct esp_struct * info;
645 unsigned err_status;
646 unsigned int scratch;
647
648 #ifdef SERIAL_DEBUG_INTR
649 printk("rs_interrupt_single(%d)...", irq);
650 #endif
651 info = (struct esp_struct *)dev_id;
652 err_status = 0;
653 scratch = serial_in(info, UART_ESI_SID);
654
655 cli();
656
657 if (!info->tty) {
658 sti();
659 return IRQ_NONE;
660 }
661
662 if (scratch & 0x04) { /* error */
663 serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
664 err_status = serial_in(info, UART_ESI_STAT1);
665 serial_in(info, UART_ESI_STAT2);
666
667 if (err_status & 0x01)
668 info->stat_flags |= ESP_STAT_RX_TIMEOUT;
669
670 if (err_status & 0x20) /* UART status */
671 check_modem_status(info);
672
673 if (err_status & 0x80) /* Start break */
674 wake_up_interruptible(&info->break_wait);
675 }
676
677 if ((scratch & 0x88) || /* DMA completed or timed out */
678 (err_status & 0x1c) /* receive error */) {
679 if (info->stat_flags & ESP_STAT_DMA_RX)
680 receive_chars_dma_done(info, err_status);
681 else if (info->stat_flags & ESP_STAT_DMA_TX)
682 transmit_chars_dma_done(info);
683 }
684
685 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
686 ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
687 (info->IER & UART_IER_RDI)) {
688 int num_bytes;
689
690 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
691 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
692 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
693 num_bytes |= serial_in(info, UART_ESI_STAT2);
694
695 if (num_bytes > (TTY_FLIPBUF_SIZE - info->tty->flip.count))
696 num_bytes = TTY_FLIPBUF_SIZE - info->tty->flip.count;
697
698 if (num_bytes) {
699 if (dma_bytes ||
700 (info->stat_flags & ESP_STAT_USE_PIO) ||
701 (num_bytes <= info->config.pio_threshold))
702 receive_chars_pio(info, num_bytes);
703 else
704 receive_chars_dma(info, num_bytes);
705 }
706 }
707
708 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
709 (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
710 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
711 info->IER &= ~UART_IER_THRI;
712 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
713 serial_out(info, UART_ESI_CMD2, info->IER);
714 } else {
715 int num_bytes;
716
717 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
718 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
719 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
720 num_bytes |= serial_in(info, UART_ESI_STAT2);
721
722 if (num_bytes > info->xmit_cnt)
723 num_bytes = info->xmit_cnt;
724
725 if (num_bytes) {
726 if (dma_bytes ||
727 (info->stat_flags & ESP_STAT_USE_PIO) ||
728 (num_bytes <= info->config.pio_threshold))
729 transmit_chars_pio(info, num_bytes);
730 else
731 transmit_chars_dma(info, num_bytes);
732 }
733 }
734 }
735
736 info->last_active = jiffies;
737
738 #ifdef SERIAL_DEBUG_INTR
739 printk("end.\n");
740 #endif
741 sti();
742 return IRQ_HANDLED;
743 }
744
745 /*
746 * -------------------------------------------------------------------
747 * Here ends the serial interrupt routines.
748 * -------------------------------------------------------------------
749 */
750
751 static void do_softint(void *private_)
752 {
753 struct esp_struct *info = (struct esp_struct *) private_;
754 struct tty_struct *tty;
755
756 tty = info->tty;
757 if (!tty)
758 return;
759
760 if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
761 tty_wakeup(tty);
762 }
763 }
764
765 /*
766 * This routine is called from the scheduler tqueue when the interrupt
767 * routine has signalled that a hangup has occurred. The path of
768 * hangup processing is:
769 *
770 * serial interrupt routine -> (scheduler tqueue) ->
771 * do_serial_hangup() -> tty->hangup() -> esp_hangup()
772 *
773 */
774 static void do_serial_hangup(void *private_)
775 {
776 struct esp_struct *info = (struct esp_struct *) private_;
777 struct tty_struct *tty;
778
779 tty = info->tty;
780 if (tty)
781 tty_hangup(tty);
782 }
783
784 /*
785 * ---------------------------------------------------------------
786 * Low level utility subroutines for the serial driver: routines to
787 * figure out the appropriate timeout for an interrupt chain, routines
788 * to initialize and startup a serial port, and routines to shutdown a
789 * serial port. Useful stuff like that.
790 * ---------------------------------------------------------------
791 */
792
793 static _INLINE_ void esp_basic_init(struct esp_struct * info)
794 {
795 /* put ESPC in enhanced mode */
796 serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
797
798 if (info->stat_flags & ESP_STAT_NEVER_DMA)
799 serial_out(info, UART_ESI_CMD2, 0x01);
800 else
801 serial_out(info, UART_ESI_CMD2, 0x31);
802
803 /* disable interrupts for now */
804 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
805 serial_out(info, UART_ESI_CMD2, 0x00);
806
807 /* set interrupt and DMA channel */
808 serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
809
810 if (info->stat_flags & ESP_STAT_NEVER_DMA)
811 serial_out(info, UART_ESI_CMD2, 0x01);
812 else
813 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
814
815 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
816
817 if (info->line % 8) /* secondary port */
818 serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
819 else if (info->irq == 9)
820 serial_out(info, UART_ESI_CMD2, 0x02);
821 else
822 serial_out(info, UART_ESI_CMD2, info->irq);
823
824 /* set error status mask (check this) */
825 serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
826
827 if (info->stat_flags & ESP_STAT_NEVER_DMA)
828 serial_out(info, UART_ESI_CMD2, 0xa1);
829 else
830 serial_out(info, UART_ESI_CMD2, 0xbd);
831
832 serial_out(info, UART_ESI_CMD2, 0x00);
833
834 /* set DMA timeout */
835 serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
836 serial_out(info, UART_ESI_CMD2, 0xff);
837
838 /* set FIFO trigger levels */
839 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
840 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
841 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
842 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
843 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
844
845 /* Set clock scaling and wait states */
846 serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
847 serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
848
849 /* set reinterrupt pacing */
850 serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
851 serial_out(info, UART_ESI_CMD2, 0xff);
852 }
853
854 static int startup(struct esp_struct * info)
855 {
856 unsigned long flags;
857 int retval=0;
858 unsigned int num_chars;
859
860 save_flags(flags); cli();
861
862 if (info->flags & ASYNC_INITIALIZED)
863 goto out;
864
865 if (!info->xmit_buf) {
866 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
867 retval = -ENOMEM;
868 if (!info->xmit_buf)
869 goto out;
870 }
871
872 #ifdef SERIAL_DEBUG_OPEN
873 printk("starting up ttys%d (irq %d)...", info->line, info->irq);
874 #endif
875
876 /* Flush the RX buffer. Using the ESI flush command may cause */
877 /* wild interrupts, so read all the data instead. */
878
879 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
880 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
881 num_chars = serial_in(info, UART_ESI_STAT1) << 8;
882 num_chars |= serial_in(info, UART_ESI_STAT2);
883
884 while (num_chars > 1) {
885 inw(info->port + UART_ESI_RX);
886 num_chars -= 2;
887 }
888
889 if (num_chars)
890 serial_in(info, UART_ESI_RX);
891
892 /* set receive character timeout */
893 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
894 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
895
896 /* clear all flags except the "never DMA" flag */
897 info->stat_flags &= ESP_STAT_NEVER_DMA;
898
899 if (info->stat_flags & ESP_STAT_NEVER_DMA)
900 info->stat_flags |= ESP_STAT_USE_PIO;
901
902 /*
903 * Allocate the IRQ
904 */
905
906 retval = request_irq(info->irq, rs_interrupt_single, SA_SHIRQ,
907 "esp serial", info);
908
909 if (retval) {
910 if (capable(CAP_SYS_ADMIN)) {
911 if (info->tty)
912 set_bit(TTY_IO_ERROR,
913 &info->tty->flags);
914 retval = 0;
915 }
916 goto out;
917 }
918
919 if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
920 dma_buffer = (char *)__get_dma_pages(
921 GFP_KERNEL, get_order(DMA_BUFFER_SZ));
922
923 /* use PIO mode if DMA buf/chan cannot be allocated */
924 if (!dma_buffer)
925 info->stat_flags |= ESP_STAT_USE_PIO;
926 else if (request_dma(dma, "esp serial")) {
927 free_pages((unsigned long)dma_buffer,
928 get_order(DMA_BUFFER_SZ));
929 dma_buffer = NULL;
930 info->stat_flags |= ESP_STAT_USE_PIO;
931 }
932
933 }
934
935 info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
936 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
937 serial_out(info, UART_ESI_CMD2, UART_MCR);
938 serial_out(info, UART_ESI_CMD2, info->MCR);
939
940 /*
941 * Finally, enable interrupts
942 */
943 /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
944 info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
945 UART_IER_DMA_TC;
946 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
947 serial_out(info, UART_ESI_CMD2, info->IER);
948
949 if (info->tty)
950 clear_bit(TTY_IO_ERROR, &info->tty->flags);
951 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
952
953 /*
954 * Set up the tty->alt_speed kludge
955 */
956 if (info->tty) {
957 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
958 info->tty->alt_speed = 57600;
959 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
960 info->tty->alt_speed = 115200;
961 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
962 info->tty->alt_speed = 230400;
963 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
964 info->tty->alt_speed = 460800;
965 }
966
967 /*
968 * set the speed of the serial port
969 */
970 change_speed(info);
971
972 info->flags |= ASYNC_INITIALIZED;
973 retval = 0;
974 out: restore_flags(flags);
975 return retval;
976 }
977
978 /*
979 * This routine will shutdown a serial port; interrupts are disabled, and
980 * DTR is dropped if the hangup on close termio flag is on.
981 */
982 static void shutdown(struct esp_struct * info)
983 {
984 unsigned long flags, f;
985
986 if (!(info->flags & ASYNC_INITIALIZED))
987 return;
988
989 #ifdef SERIAL_DEBUG_OPEN
990 printk("Shutting down serial port %d (irq %d)....", info->line,
991 info->irq);
992 #endif
993
994 save_flags(flags); cli(); /* Disable interrupts */
995
996 /*
997 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
998 * here so the queue might never be waken up
999 */
1000 wake_up_interruptible(&info->delta_msr_wait);
1001 wake_up_interruptible(&info->break_wait);
1002
1003 /* stop a DMA transfer on the port being closed */
1004
1005 if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
1006 f=claim_dma_lock();
1007 disable_dma(dma);
1008 clear_dma_ff(dma);
1009 release_dma_lock(f);
1010
1011 dma_bytes = 0;
1012 }
1013
1014 /*
1015 * Free the IRQ
1016 */
1017 free_irq(info->irq, info);
1018
1019 if (dma_buffer) {
1020 struct esp_struct *current_port = ports;
1021
1022 while (current_port) {
1023 if ((current_port != info) &&
1024 (current_port->flags & ASYNC_INITIALIZED))
1025 break;
1026
1027 current_port = current_port->next_port;
1028 }
1029
1030 if (!current_port) {
1031 free_dma(dma);
1032 free_pages((unsigned long)dma_buffer,
1033 get_order(DMA_BUFFER_SZ));
1034 dma_buffer = NULL;
1035 }
1036 }
1037
1038 if (info->xmit_buf) {
1039 free_page((unsigned long) info->xmit_buf);
1040 info->xmit_buf = NULL;
1041 }
1042
1043 info->IER = 0;
1044 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1045 serial_out(info, UART_ESI_CMD2, 0x00);
1046
1047 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1048 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1049
1050 info->MCR &= ~UART_MCR_OUT2;
1051 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1052 serial_out(info, UART_ESI_CMD2, UART_MCR);
1053 serial_out(info, UART_ESI_CMD2, info->MCR);
1054
1055 if (info->tty)
1056 set_bit(TTY_IO_ERROR, &info->tty->flags);
1057
1058 info->flags &= ~ASYNC_INITIALIZED;
1059 restore_flags(flags);
1060 }
1061
1062 /*
1063 * This routine is called to set the UART divisor registers to match
1064 * the specified baud rate for a serial port.
1065 */
1066 static void change_speed(struct esp_struct *info)
1067 {
1068 unsigned short port;
1069 int quot = 0;
1070 unsigned cflag,cval;
1071 int baud, bits;
1072 unsigned char flow1 = 0, flow2 = 0;
1073 unsigned long flags;
1074
1075 if (!info->tty || !info->tty->termios)
1076 return;
1077 cflag = info->tty->termios->c_cflag;
1078 port = info->port;
1079
1080 /* byte size and parity */
1081 switch (cflag & CSIZE) {
1082 case CS5: cval = 0x00; bits = 7; break;
1083 case CS6: cval = 0x01; bits = 8; break;
1084 case CS7: cval = 0x02; bits = 9; break;
1085 case CS8: cval = 0x03; bits = 10; break;
1086 default: cval = 0x00; bits = 7; break;
1087 }
1088 if (cflag & CSTOPB) {
1089 cval |= 0x04;
1090 bits++;
1091 }
1092 if (cflag & PARENB) {
1093 cval |= UART_LCR_PARITY;
1094 bits++;
1095 }
1096 if (!(cflag & PARODD))
1097 cval |= UART_LCR_EPAR;
1098 #ifdef CMSPAR
1099 if (cflag & CMSPAR)
1100 cval |= UART_LCR_SPAR;
1101 #endif
1102
1103 baud = tty_get_baud_rate(info->tty);
1104 if (baud == 38400 &&
1105 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1106 quot = info->custom_divisor;
1107 else {
1108 if (baud == 134)
1109 /* Special case since 134 is really 134.5 */
1110 quot = (2*BASE_BAUD / 269);
1111 else if (baud)
1112 quot = BASE_BAUD / baud;
1113 }
1114 /* If the quotient is ever zero, default to 9600 bps */
1115 if (!quot)
1116 quot = BASE_BAUD / 9600;
1117
1118 info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1119
1120 /* CTS flow control flag and modem status interrupts */
1121 /* info->IER &= ~UART_IER_MSI; */
1122 if (cflag & CRTSCTS) {
1123 info->flags |= ASYNC_CTS_FLOW;
1124 /* info->IER |= UART_IER_MSI; */
1125 flow1 = 0x04;
1126 flow2 = 0x10;
1127 } else
1128 info->flags &= ~ASYNC_CTS_FLOW;
1129 if (cflag & CLOCAL)
1130 info->flags &= ~ASYNC_CHECK_CD;
1131 else {
1132 info->flags |= ASYNC_CHECK_CD;
1133 /* info->IER |= UART_IER_MSI; */
1134 }
1135
1136 /*
1137 * Set up parity check flag
1138 */
1139 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1140
1141 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1142 if (I_INPCK(info->tty))
1143 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1144 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1145 info->read_status_mask |= UART_LSR_BI;
1146
1147 info->ignore_status_mask = 0;
1148 #if 0
1149 /* This should be safe, but for some broken bits of hardware... */
1150 if (I_IGNPAR(info->tty)) {
1151 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1152 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1153 }
1154 #endif
1155 if (I_IGNBRK(info->tty)) {
1156 info->ignore_status_mask |= UART_LSR_BI;
1157 info->read_status_mask |= UART_LSR_BI;
1158 /*
1159 * If we're ignore parity and break indicators, ignore
1160 * overruns too. (For real raw support).
1161 */
1162 if (I_IGNPAR(info->tty)) {
1163 info->ignore_status_mask |= UART_LSR_OE | \
1164 UART_LSR_PE | UART_LSR_FE;
1165 info->read_status_mask |= UART_LSR_OE | \
1166 UART_LSR_PE | UART_LSR_FE;
1167 }
1168 }
1169
1170 if (I_IXOFF(info->tty))
1171 flow1 |= 0x81;
1172
1173 save_flags(flags); cli();
1174 /* set baud */
1175 serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1176 serial_out(info, UART_ESI_CMD2, quot >> 8);
1177 serial_out(info, UART_ESI_CMD2, quot & 0xff);
1178
1179 /* set data bits, parity, etc. */
1180 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1181 serial_out(info, UART_ESI_CMD2, UART_LCR);
1182 serial_out(info, UART_ESI_CMD2, cval);
1183
1184 /* Enable flow control */
1185 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1186 serial_out(info, UART_ESI_CMD2, flow1);
1187 serial_out(info, UART_ESI_CMD2, flow2);
1188
1189 /* set flow control characters (XON/XOFF only) */
1190 if (I_IXOFF(info->tty)) {
1191 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1192 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1193 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1194 serial_out(info, UART_ESI_CMD2, 0x10);
1195 serial_out(info, UART_ESI_CMD2, 0x21);
1196 switch (cflag & CSIZE) {
1197 case CS5:
1198 serial_out(info, UART_ESI_CMD2, 0x1f);
1199 break;
1200 case CS6:
1201 serial_out(info, UART_ESI_CMD2, 0x3f);
1202 break;
1203 case CS7:
1204 case CS8:
1205 serial_out(info, UART_ESI_CMD2, 0x7f);
1206 break;
1207 default:
1208 serial_out(info, UART_ESI_CMD2, 0xff);
1209 break;
1210 }
1211 }
1212
1213 /* Set high/low water */
1214 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1215 serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1216 serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1217 serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1218 serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1219
1220 restore_flags(flags);
1221 }
1222
1223 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1224 {
1225 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1226 unsigned long flags;
1227
1228 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1229 return;
1230
1231 if (!tty || !info->xmit_buf)
1232 return;
1233
1234 save_flags(flags); cli();
1235 if (info->xmit_cnt >= ESP_XMIT_SIZE - 1) {
1236 restore_flags(flags);
1237 return;
1238 }
1239
1240 info->xmit_buf[info->xmit_head++] = ch;
1241 info->xmit_head &= ESP_XMIT_SIZE-1;
1242 info->xmit_cnt++;
1243 restore_flags(flags);
1244 }
1245
1246 static void rs_flush_chars(struct tty_struct *tty)
1247 {
1248 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1249 unsigned long flags;
1250
1251 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1252 return;
1253
1254 if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1255 return;
1256
1257 save_flags(flags); cli();
1258 if (!(info->IER & UART_IER_THRI)) {
1259 info->IER |= UART_IER_THRI;
1260 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1261 serial_out(info, UART_ESI_CMD2, info->IER);
1262 }
1263 restore_flags(flags);
1264 }
1265
1266 static int rs_write(struct tty_struct * tty, int from_user,
1267 const unsigned char *buf, int count)
1268 {
1269 int c, t, ret = 0;
1270 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1271 unsigned long flags;
1272
1273 if (serial_paranoia_check(info, tty->name, "rs_write"))
1274 return 0;
1275
1276 if (!tty || !info->xmit_buf || !tmp_buf)
1277 return 0;
1278
1279 if (from_user)
1280 down(&tmp_buf_sem);
1281
1282 while (1) {
1283 /* Thanks to R. Wolff for suggesting how to do this with */
1284 /* interrupts enabled */
1285
1286 c = count;
1287 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1288
1289 if (t < c)
1290 c = t;
1291
1292 t = ESP_XMIT_SIZE - info->xmit_head;
1293
1294 if (t < c)
1295 c = t;
1296
1297 if (c <= 0)
1298 break;
1299
1300 if (from_user) {
1301 c -= copy_from_user(tmp_buf, buf, c);
1302
1303 if (!c) {
1304 if (!ret)
1305 ret = -EFAULT;
1306 break;
1307 }
1308
1309 memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
1310 } else
1311 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1312
1313 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1314 info->xmit_cnt += c;
1315 buf += c;
1316 count -= c;
1317 ret += c;
1318 }
1319
1320 if (from_user)
1321 up(&tmp_buf_sem);
1322
1323 save_flags(flags); cli();
1324
1325 if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1326 info->IER |= UART_IER_THRI;
1327 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1328 serial_out(info, UART_ESI_CMD2, info->IER);
1329 }
1330
1331 restore_flags(flags);
1332 return ret;
1333 }
1334
1335 static int rs_write_room(struct tty_struct *tty)
1336 {
1337 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1338 int ret;
1339
1340 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1341 return 0;
1342 ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1343 if (ret < 0)
1344 ret = 0;
1345 return ret;
1346 }
1347
1348 static int rs_chars_in_buffer(struct tty_struct *tty)
1349 {
1350 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1351
1352 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1353 return 0;
1354 return info->xmit_cnt;
1355 }
1356
1357 static void rs_flush_buffer(struct tty_struct *tty)
1358 {
1359 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1360
1361 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1362 return;
1363 cli();
1364 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1365 sti();
1366 tty_wakeup(tty);
1367 }
1368
1369 /*
1370 * ------------------------------------------------------------
1371 * rs_throttle()
1372 *
1373 * This routine is called by the upper-layer tty layer to signal that
1374 * incoming characters should be throttled.
1375 * ------------------------------------------------------------
1376 */
1377 static void rs_throttle(struct tty_struct * tty)
1378 {
1379 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1380 #ifdef SERIAL_DEBUG_THROTTLE
1381 char buf[64];
1382
1383 printk("throttle %s: %d....\n", tty_name(tty, buf),
1384 tty->ldisc.chars_in_buffer(tty));
1385 #endif
1386
1387 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1388 return;
1389
1390 cli();
1391 info->IER &= ~UART_IER_RDI;
1392 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1393 serial_out(info, UART_ESI_CMD2, info->IER);
1394 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1395 serial_out(info, UART_ESI_CMD2, 0x00);
1396 sti();
1397 }
1398
1399 static void rs_unthrottle(struct tty_struct * tty)
1400 {
1401 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1402 #ifdef SERIAL_DEBUG_THROTTLE
1403 char buf[64];
1404
1405 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1406 tty->ldisc.chars_in_buffer(tty));
1407 #endif
1408
1409 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1410 return;
1411
1412 cli();
1413 info->IER |= UART_IER_RDI;
1414 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1415 serial_out(info, UART_ESI_CMD2, info->IER);
1416 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1417 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1418 sti();
1419 }
1420
1421 /*
1422 * ------------------------------------------------------------
1423 * rs_ioctl() and friends
1424 * ------------------------------------------------------------
1425 */
1426
1427 static int get_serial_info(struct esp_struct * info,
1428 struct serial_struct __user *retinfo)
1429 {
1430 struct serial_struct tmp;
1431
1432 memset(&tmp, 0, sizeof(tmp));
1433 tmp.type = PORT_16550A;
1434 tmp.line = info->line;
1435 tmp.port = info->port;
1436 tmp.irq = info->irq;
1437 tmp.flags = info->flags;
1438 tmp.xmit_fifo_size = 1024;
1439 tmp.baud_base = BASE_BAUD;
1440 tmp.close_delay = info->close_delay;
1441 tmp.closing_wait = info->closing_wait;
1442 tmp.custom_divisor = info->custom_divisor;
1443 tmp.hub6 = 0;
1444 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1445 return -EFAULT;
1446 return 0;
1447 }
1448
1449 static int get_esp_config(struct esp_struct * info,
1450 struct hayes_esp_config __user *retinfo)
1451 {
1452 struct hayes_esp_config tmp;
1453
1454 if (!retinfo)
1455 return -EFAULT;
1456
1457 memset(&tmp, 0, sizeof(tmp));
1458 tmp.rx_timeout = info->config.rx_timeout;
1459 tmp.rx_trigger = info->config.rx_trigger;
1460 tmp.tx_trigger = info->config.tx_trigger;
1461 tmp.flow_off = info->config.flow_off;
1462 tmp.flow_on = info->config.flow_on;
1463 tmp.pio_threshold = info->config.pio_threshold;
1464 tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1465
1466 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1467 }
1468
1469 static int set_serial_info(struct esp_struct * info,
1470 struct serial_struct __user *new_info)
1471 {
1472 struct serial_struct new_serial;
1473 struct esp_struct old_info;
1474 unsigned int change_irq;
1475 int retval = 0;
1476 struct esp_struct *current_async;
1477
1478 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1479 return -EFAULT;
1480 old_info = *info;
1481
1482 if ((new_serial.type != PORT_16550A) ||
1483 (new_serial.hub6) ||
1484 (info->port != new_serial.port) ||
1485 (new_serial.baud_base != BASE_BAUD) ||
1486 (new_serial.irq > 15) ||
1487 (new_serial.irq < 2) ||
1488 (new_serial.irq == 6) ||
1489 (new_serial.irq == 8) ||
1490 (new_serial.irq == 13))
1491 return -EINVAL;
1492
1493 change_irq = new_serial.irq != info->irq;
1494
1495 if (change_irq && (info->line % 8))
1496 return -EINVAL;
1497
1498 if (!capable(CAP_SYS_ADMIN)) {
1499 if (change_irq ||
1500 (new_serial.close_delay != info->close_delay) ||
1501 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1502 (info->flags & ~ASYNC_USR_MASK)))
1503 return -EPERM;
1504 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1505 (new_serial.flags & ASYNC_USR_MASK));
1506 info->custom_divisor = new_serial.custom_divisor;
1507 } else {
1508 if (new_serial.irq == 2)
1509 new_serial.irq = 9;
1510
1511 if (change_irq) {
1512 current_async = ports;
1513
1514 while (current_async) {
1515 if ((current_async->line >= info->line) &&
1516 (current_async->line < (info->line + 8))) {
1517 if (current_async == info) {
1518 if (current_async->count > 1)
1519 return -EBUSY;
1520 } else if (current_async->count)
1521 return -EBUSY;
1522 }
1523
1524 current_async = current_async->next_port;
1525 }
1526 }
1527
1528 /*
1529 * OK, past this point, all the error checking has been done.
1530 * At this point, we start making changes.....
1531 */
1532
1533 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1534 (new_serial.flags & ASYNC_FLAGS));
1535 info->custom_divisor = new_serial.custom_divisor;
1536 info->close_delay = new_serial.close_delay * HZ/100;
1537 info->closing_wait = new_serial.closing_wait * HZ/100;
1538
1539 if (change_irq) {
1540 /*
1541 * We need to shutdown the serial port at the old
1542 * port/irq combination.
1543 */
1544 shutdown(info);
1545
1546 current_async = ports;
1547
1548 while (current_async) {
1549 if ((current_async->line >= info->line) &&
1550 (current_async->line < (info->line + 8)))
1551 current_async->irq = new_serial.irq;
1552
1553 current_async = current_async->next_port;
1554 }
1555
1556 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1557 if (info->irq == 9)
1558 serial_out(info, UART_ESI_CMD2, 0x02);
1559 else
1560 serial_out(info, UART_ESI_CMD2, info->irq);
1561 }
1562 }
1563
1564 if (info->flags & ASYNC_INITIALIZED) {
1565 if (((old_info.flags & ASYNC_SPD_MASK) !=
1566 (info->flags & ASYNC_SPD_MASK)) ||
1567 (old_info.custom_divisor != info->custom_divisor)) {
1568 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1569 info->tty->alt_speed = 57600;
1570 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1571 info->tty->alt_speed = 115200;
1572 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1573 info->tty->alt_speed = 230400;
1574 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1575 info->tty->alt_speed = 460800;
1576 change_speed(info);
1577 }
1578 } else
1579 retval = startup(info);
1580
1581 return retval;
1582 }
1583
1584 static int set_esp_config(struct esp_struct * info,
1585 struct hayes_esp_config __user * new_info)
1586 {
1587 struct hayes_esp_config new_config;
1588 unsigned int change_dma;
1589 int retval = 0;
1590 struct esp_struct *current_async;
1591
1592 /* Perhaps a non-sysadmin user should be able to do some of these */
1593 /* operations. I haven't decided yet. */
1594
1595 if (!capable(CAP_SYS_ADMIN))
1596 return -EPERM;
1597
1598 if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1599 return -EFAULT;
1600
1601 if ((new_config.flow_on >= new_config.flow_off) ||
1602 (new_config.rx_trigger < 1) ||
1603 (new_config.tx_trigger < 1) ||
1604 (new_config.flow_off < 1) ||
1605 (new_config.flow_on < 1) ||
1606 (new_config.rx_trigger > 1023) ||
1607 (new_config.tx_trigger > 1023) ||
1608 (new_config.flow_off > 1023) ||
1609 (new_config.flow_on > 1023) ||
1610 (new_config.pio_threshold < 0) ||
1611 (new_config.pio_threshold > 1024))
1612 return -EINVAL;
1613
1614 if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1615 new_config.dma_channel = 0;
1616
1617 if (info->stat_flags & ESP_STAT_NEVER_DMA)
1618 change_dma = new_config.dma_channel;
1619 else
1620 change_dma = (new_config.dma_channel != dma);
1621
1622 if (change_dma) {
1623 if (new_config.dma_channel) {
1624 /* PIO mode to DMA mode transition OR */
1625 /* change current DMA channel */
1626
1627 current_async = ports;
1628
1629 while (current_async) {
1630 if (current_async == info) {
1631 if (current_async->count > 1)
1632 return -EBUSY;
1633 } else if (current_async->count)
1634 return -EBUSY;
1635
1636 current_async =
1637 current_async->next_port;
1638 }
1639
1640 shutdown(info);
1641 dma = new_config.dma_channel;
1642 info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1643
1644 /* all ports must use the same DMA channel */
1645
1646 current_async = ports;
1647
1648 while (current_async) {
1649 esp_basic_init(current_async);
1650 current_async = current_async->next_port;
1651 }
1652 } else {
1653 /* DMA mode to PIO mode only */
1654
1655 if (info->count > 1)
1656 return -EBUSY;
1657
1658 shutdown(info);
1659 info->stat_flags |= ESP_STAT_NEVER_DMA;
1660 esp_basic_init(info);
1661 }
1662 }
1663
1664 info->config.pio_threshold = new_config.pio_threshold;
1665
1666 if ((new_config.flow_off != info->config.flow_off) ||
1667 (new_config.flow_on != info->config.flow_on)) {
1668 unsigned long flags;
1669
1670 info->config.flow_off = new_config.flow_off;
1671 info->config.flow_on = new_config.flow_on;
1672 save_flags(flags); cli();
1673 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1674 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1675 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1676 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1677 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1678 restore_flags(flags);
1679 }
1680
1681 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1682 (new_config.tx_trigger != info->config.tx_trigger)) {
1683 unsigned long flags;
1684
1685 info->config.rx_trigger = new_config.rx_trigger;
1686 info->config.tx_trigger = new_config.tx_trigger;
1687 save_flags(flags); cli();
1688 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1689 serial_out(info, UART_ESI_CMD2,
1690 new_config.rx_trigger >> 8);
1691 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1692 serial_out(info, UART_ESI_CMD2,
1693 new_config.tx_trigger >> 8);
1694 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1695 restore_flags(flags);
1696 }
1697
1698 if (new_config.rx_timeout != info->config.rx_timeout) {
1699 unsigned long flags;
1700
1701 info->config.rx_timeout = new_config.rx_timeout;
1702 save_flags(flags); cli();
1703
1704 if (info->IER & UART_IER_RDI) {
1705 serial_out(info, UART_ESI_CMD1,
1706 ESI_SET_RX_TIMEOUT);
1707 serial_out(info, UART_ESI_CMD2,
1708 new_config.rx_timeout);
1709 }
1710
1711 restore_flags(flags);
1712 }
1713
1714 if (!(info->flags & ASYNC_INITIALIZED))
1715 retval = startup(info);
1716
1717 return retval;
1718 }
1719
1720 /*
1721 * get_lsr_info - get line status register info
1722 *
1723 * Purpose: Let user call ioctl() to get info when the UART physically
1724 * is emptied. On bus types like RS485, the transmitter must
1725 * release the bus after transmitting. This must be done when
1726 * the transmit shift register is empty, not be done when the
1727 * transmit holding register is empty. This functionality
1728 * allows an RS485 driver to be written in user space.
1729 */
1730 static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1731 {
1732 unsigned char status;
1733 unsigned int result;
1734
1735 cli();
1736 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1737 status = serial_in(info, UART_ESI_STAT1);
1738 sti();
1739 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1740 return put_user(result,value);
1741 }
1742
1743
1744 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1745 {
1746 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1747 unsigned char control, status;
1748
1749 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1750 return -ENODEV;
1751 if (tty->flags & (1 << TTY_IO_ERROR))
1752 return -EIO;
1753
1754 control = info->MCR;
1755 cli();
1756 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1757 status = serial_in(info, UART_ESI_STAT2);
1758 sti();
1759 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1760 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1761 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1762 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1763 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1764 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1765 }
1766
1767 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1768 unsigned int set, unsigned int clear)
1769 {
1770 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1771
1772 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1773 return -ENODEV;
1774 if (tty->flags & (1 << TTY_IO_ERROR))
1775 return -EIO;
1776
1777 cli();
1778
1779 if (set & TIOCM_RTS)
1780 info->MCR |= UART_MCR_RTS;
1781 if (set & TIOCM_DTR)
1782 info->MCR |= UART_MCR_DTR;
1783
1784 if (clear & TIOCM_RTS)
1785 info->MCR &= ~UART_MCR_RTS;
1786 if (clear & TIOCM_DTR)
1787 info->MCR &= ~UART_MCR_DTR;
1788
1789 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1790 serial_out(info, UART_ESI_CMD2, UART_MCR);
1791 serial_out(info, UART_ESI_CMD2, info->MCR);
1792 sti();
1793 return 0;
1794 }
1795
1796 /*
1797 * rs_break() --- routine which turns the break handling on or off
1798 */
1799 static void esp_break(struct tty_struct *tty, int break_state)
1800 {
1801 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1802 unsigned long flags;
1803
1804 if (serial_paranoia_check(info, tty->name, "esp_break"))
1805 return;
1806
1807 save_flags(flags); cli();
1808 if (break_state == -1) {
1809 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1810 serial_out(info, UART_ESI_CMD2, 0x01);
1811
1812 interruptible_sleep_on(&info->break_wait);
1813 } else {
1814 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1815 serial_out(info, UART_ESI_CMD2, 0x00);
1816 }
1817 restore_flags(flags);
1818 }
1819
1820 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1821 unsigned int cmd, unsigned long arg)
1822 {
1823 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1824 struct async_icount cprev, cnow; /* kernel counter temps */
1825 struct serial_icounter_struct __user *p_cuser; /* user space */
1826 void __user *argp = (void __user *)arg;
1827
1828 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1829 return -ENODEV;
1830
1831 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1832 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1833 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1834 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1835 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1836 if (tty->flags & (1 << TTY_IO_ERROR))
1837 return -EIO;
1838 }
1839
1840 switch (cmd) {
1841 case TIOCGSERIAL:
1842 return get_serial_info(info, argp);
1843 case TIOCSSERIAL:
1844 return set_serial_info(info, argp);
1845 case TIOCSERCONFIG:
1846 /* do not reconfigure after initial configuration */
1847 return 0;
1848
1849 case TIOCSERGWILD:
1850 return put_user(0L, (unsigned long __user *)argp);
1851
1852 case TIOCSERGETLSR: /* Get line status register */
1853 return get_lsr_info(info, argp);
1854
1855 case TIOCSERSWILD:
1856 if (!capable(CAP_SYS_ADMIN))
1857 return -EPERM;
1858 return 0;
1859
1860 /*
1861 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1862 * - mask passed in arg for lines of interest
1863 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1864 * Caller should use TIOCGICOUNT to see which one it was
1865 */
1866 case TIOCMIWAIT:
1867 cli();
1868 cprev = info->icount; /* note the counters on entry */
1869 sti();
1870 while (1) {
1871 interruptible_sleep_on(&info->delta_msr_wait);
1872 /* see if a signal did it */
1873 if (signal_pending(current))
1874 return -ERESTARTSYS;
1875 cli();
1876 cnow = info->icount; /* atomic copy */
1877 sti();
1878 if (cnow.rng == cprev.rng &&
1879 cnow.dsr == cprev.dsr &&
1880 cnow.dcd == cprev.dcd &&
1881 cnow.cts == cprev.cts)
1882 return -EIO; /* no change => error */
1883 if (((arg & TIOCM_RNG) &&
1884 (cnow.rng != cprev.rng)) ||
1885 ((arg & TIOCM_DSR) &&
1886 (cnow.dsr != cprev.dsr)) ||
1887 ((arg & TIOCM_CD) &&
1888 (cnow.dcd != cprev.dcd)) ||
1889 ((arg & TIOCM_CTS) &&
1890 (cnow.cts != cprev.cts)) ) {
1891 return 0;
1892 }
1893 cprev = cnow;
1894 }
1895 /* NOTREACHED */
1896
1897 /*
1898 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1899 * Return: write counters to the user passed counter struct
1900 * NB: both 1->0 and 0->1 transitions are counted except for
1901 * RI where only 0->1 is counted.
1902 */
1903 case TIOCGICOUNT:
1904 cli();
1905 cnow = info->icount;
1906 sti();
1907 p_cuser = argp;
1908 if (put_user(cnow.cts, &p_cuser->cts) ||
1909 put_user(cnow.dsr, &p_cuser->dsr) ||
1910 put_user(cnow.rng, &p_cuser->rng) ||
1911 put_user(cnow.dcd, &p_cuser->dcd))
1912 return -EFAULT;
1913
1914 return 0;
1915 case TIOCGHAYESESP:
1916 return get_esp_config(info, argp);
1917 case TIOCSHAYESESP:
1918 return set_esp_config(info, argp);
1919
1920 default:
1921 return -ENOIOCTLCMD;
1922 }
1923 return 0;
1924 }
1925
1926 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1927 {
1928 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1929
1930 if ( (tty->termios->c_cflag == old_termios->c_cflag)
1931 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
1932 == RELEVANT_IFLAG(old_termios->c_iflag)))
1933 return;
1934
1935 change_speed(info);
1936
1937 /* Handle transition to B0 status */
1938 if ((old_termios->c_cflag & CBAUD) &&
1939 !(tty->termios->c_cflag & CBAUD)) {
1940 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1941 cli();
1942 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1943 serial_out(info, UART_ESI_CMD2, UART_MCR);
1944 serial_out(info, UART_ESI_CMD2, info->MCR);
1945 sti();
1946 }
1947
1948 /* Handle transition away from B0 status */
1949 if (!(old_termios->c_cflag & CBAUD) &&
1950 (tty->termios->c_cflag & CBAUD)) {
1951 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1952 cli();
1953 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1954 serial_out(info, UART_ESI_CMD2, UART_MCR);
1955 serial_out(info, UART_ESI_CMD2, info->MCR);
1956 sti();
1957 }
1958
1959 /* Handle turning of CRTSCTS */
1960 if ((old_termios->c_cflag & CRTSCTS) &&
1961 !(tty->termios->c_cflag & CRTSCTS)) {
1962 rs_start(tty);
1963 }
1964
1965 #if 0
1966 /*
1967 * No need to wake up processes in open wait, since they
1968 * sample the CLOCAL flag once, and don't recheck it.
1969 * XXX It's not clear whether the current behavior is correct
1970 * or not. Hence, this may change.....
1971 */
1972 if (!(old_termios->c_cflag & CLOCAL) &&
1973 (tty->termios->c_cflag & CLOCAL))
1974 wake_up_interruptible(&info->open_wait);
1975 #endif
1976 }
1977
1978 /*
1979 * ------------------------------------------------------------
1980 * rs_close()
1981 *
1982 * This routine is called when the serial port gets closed. First, we
1983 * wait for the last remaining data to be sent. Then, we unlink its
1984 * async structure from the interrupt chain if necessary, and we free
1985 * that IRQ if nothing is left in the chain.
1986 * ------------------------------------------------------------
1987 */
1988 static void rs_close(struct tty_struct *tty, struct file * filp)
1989 {
1990 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1991 unsigned long flags;
1992
1993 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1994 return;
1995
1996 save_flags(flags); cli();
1997
1998 if (tty_hung_up_p(filp)) {
1999 DBG_CNT("before DEC-hung");
2000 goto out;
2001 }
2002
2003 #ifdef SERIAL_DEBUG_OPEN
2004 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
2005 #endif
2006 if ((tty->count == 1) && (info->count != 1)) {
2007 /*
2008 * Uh, oh. tty->count is 1, which means that the tty
2009 * structure will be freed. Info->count should always
2010 * be one in these conditions. If it's greater than
2011 * one, we've got real problems, since it means the
2012 * serial port won't be shutdown.
2013 */
2014 printk("rs_close: bad serial port count; tty->count is 1, "
2015 "info->count is %d\n", info->count);
2016 info->count = 1;
2017 }
2018 if (--info->count < 0) {
2019 printk("rs_close: bad serial port count for ttys%d: %d\n",
2020 info->line, info->count);
2021 info->count = 0;
2022 }
2023 if (info->count) {
2024 DBG_CNT("before DEC-2");
2025 goto out;
2026 }
2027 info->flags |= ASYNC_CLOSING;
2028 /*
2029 * Now we wait for the transmit buffer to clear; and we notify
2030 * the line discipline to only process XON/XOFF characters.
2031 */
2032 tty->closing = 1;
2033 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
2034 tty_wait_until_sent(tty, info->closing_wait);
2035 /*
2036 * At this point we stop accepting input. To do this, we
2037 * disable the receive line status interrupts, and tell the
2038 * interrupt driver to stop checking the data ready bit in the
2039 * line status register.
2040 */
2041 /* info->IER &= ~UART_IER_RLSI; */
2042 info->IER &= ~UART_IER_RDI;
2043 info->read_status_mask &= ~UART_LSR_DR;
2044 if (info->flags & ASYNC_INITIALIZED) {
2045 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
2046 serial_out(info, UART_ESI_CMD2, info->IER);
2047
2048 /* disable receive timeout */
2049 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
2050 serial_out(info, UART_ESI_CMD2, 0x00);
2051
2052 /*
2053 * Before we drop DTR, make sure the UART transmitter
2054 * has completely drained; this is especially
2055 * important if there is a transmit FIFO!
2056 */
2057 rs_wait_until_sent(tty, info->timeout);
2058 }
2059 shutdown(info);
2060 if (tty->driver->flush_buffer)
2061 tty->driver->flush_buffer(tty);
2062 tty_ldisc_flush(tty);
2063 tty->closing = 0;
2064 info->event = 0;
2065 info->tty = NULL;
2066
2067 if (info->blocked_open) {
2068 if (info->close_delay) {
2069 set_current_state(TASK_INTERRUPTIBLE);
2070 schedule_timeout(info->close_delay);
2071 }
2072 wake_up_interruptible(&info->open_wait);
2073 }
2074 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2075 wake_up_interruptible(&info->close_wait);
2076 out:
2077 restore_flags(flags);
2078 }
2079
2080 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2081 {
2082 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2083 unsigned long orig_jiffies, char_time;
2084 unsigned long flags;
2085
2086 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2087 return;
2088
2089 orig_jiffies = jiffies;
2090 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2091
2092 if (!char_time)
2093 char_time = 1;
2094
2095 save_flags(flags); cli();
2096 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2097 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2098
2099 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2100 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2101 set_current_state(TASK_INTERRUPTIBLE);
2102 schedule_timeout(char_time);
2103
2104 if (signal_pending(current))
2105 break;
2106
2107 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2108 break;
2109
2110 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2111 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2112 }
2113
2114 restore_flags(flags);
2115 set_current_state(TASK_RUNNING);
2116 }
2117
2118 /*
2119 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2120 */
2121 static void esp_hangup(struct tty_struct *tty)
2122 {
2123 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2124
2125 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2126 return;
2127
2128 rs_flush_buffer(tty);
2129 shutdown(info);
2130 info->event = 0;
2131 info->count = 0;
2132 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2133 info->tty = NULL;
2134 wake_up_interruptible(&info->open_wait);
2135 }
2136
2137 /*
2138 * ------------------------------------------------------------
2139 * esp_open() and friends
2140 * ------------------------------------------------------------
2141 */
2142 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2143 struct esp_struct *info)
2144 {
2145 DECLARE_WAITQUEUE(wait, current);
2146 int retval;
2147 int do_clocal = 0;
2148 unsigned long flags;
2149
2150 /*
2151 * If the device is in the middle of being closed, then block
2152 * until it's done, and then try again.
2153 */
2154 if (tty_hung_up_p(filp) ||
2155 (info->flags & ASYNC_CLOSING)) {
2156 if (info->flags & ASYNC_CLOSING)
2157 interruptible_sleep_on(&info->close_wait);
2158 #ifdef SERIAL_DO_RESTART
2159 if (info->flags & ASYNC_HUP_NOTIFY)
2160 return -EAGAIN;
2161 else
2162 return -ERESTARTSYS;
2163 #else
2164 return -EAGAIN;
2165 #endif
2166 }
2167
2168 /*
2169 * If non-blocking mode is set, or the port is not enabled,
2170 * then make the check up front and then exit.
2171 */
2172 if ((filp->f_flags & O_NONBLOCK) ||
2173 (tty->flags & (1 << TTY_IO_ERROR))) {
2174 info->flags |= ASYNC_NORMAL_ACTIVE;
2175 return 0;
2176 }
2177
2178 if (tty->termios->c_cflag & CLOCAL)
2179 do_clocal = 1;
2180
2181 /*
2182 * Block waiting for the carrier detect and the line to become
2183 * free (i.e., not in use by the callout). While we are in
2184 * this loop, info->count is dropped by one, so that
2185 * rs_close() knows when to free things. We restore it upon
2186 * exit, either normal or abnormal.
2187 */
2188 retval = 0;
2189 add_wait_queue(&info->open_wait, &wait);
2190 #ifdef SERIAL_DEBUG_OPEN
2191 printk("block_til_ready before block: ttys%d, count = %d\n",
2192 info->line, info->count);
2193 #endif
2194 save_flags(flags);
2195 cli();
2196 if (!tty_hung_up_p(filp))
2197 info->count--;
2198 restore_flags(flags);
2199 info->blocked_open++;
2200 while (1) {
2201 save_flags(flags);
2202 cli();
2203 if ((tty->termios->c_cflag & CBAUD)) {
2204 unsigned int scratch;
2205
2206 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2207 serial_out(info, UART_ESI_CMD2, UART_MCR);
2208 scratch = serial_in(info, UART_ESI_STAT1);
2209 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2210 serial_out(info, UART_ESI_CMD2, UART_MCR);
2211 serial_out(info, UART_ESI_CMD2,
2212 scratch | UART_MCR_DTR | UART_MCR_RTS);
2213 }
2214 restore_flags(flags);
2215 set_current_state(TASK_INTERRUPTIBLE);
2216 if (tty_hung_up_p(filp) ||
2217 !(info->flags & ASYNC_INITIALIZED)) {
2218 #ifdef SERIAL_DO_RESTART
2219 if (info->flags & ASYNC_HUP_NOTIFY)
2220 retval = -EAGAIN;
2221 else
2222 retval = -ERESTARTSYS;
2223 #else
2224 retval = -EAGAIN;
2225 #endif
2226 break;
2227 }
2228
2229 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2230 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2231 do_clocal = 1;
2232
2233 if (!(info->flags & ASYNC_CLOSING) &&
2234 (do_clocal))
2235 break;
2236 if (signal_pending(current)) {
2237 retval = -ERESTARTSYS;
2238 break;
2239 }
2240 #ifdef SERIAL_DEBUG_OPEN
2241 printk("block_til_ready blocking: ttys%d, count = %d\n",
2242 info->line, info->count);
2243 #endif
2244 schedule();
2245 }
2246 set_current_state(TASK_RUNNING);
2247 remove_wait_queue(&info->open_wait, &wait);
2248 if (!tty_hung_up_p(filp))
2249 info->count++;
2250 info->blocked_open--;
2251 #ifdef SERIAL_DEBUG_OPEN
2252 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2253 info->line, info->count);
2254 #endif
2255 if (retval)
2256 return retval;
2257 info->flags |= ASYNC_NORMAL_ACTIVE;
2258 return 0;
2259 }
2260
2261 /*
2262 * This routine is called whenever a serial port is opened. It
2263 * enables interrupts for a serial port, linking in its async structure into
2264 * the IRQ chain. It also performs the serial-specific
2265 * initialization for the tty structure.
2266 */
2267 static int esp_open(struct tty_struct *tty, struct file * filp)
2268 {
2269 struct esp_struct *info;
2270 int retval, line;
2271
2272 line = tty->index;
2273 if ((line < 0) || (line >= NR_PORTS))
2274 return -ENODEV;
2275
2276 /* find the port in the chain */
2277
2278 info = ports;
2279
2280 while (info && (info->line != line))
2281 info = info->next_port;
2282
2283 if (!info) {
2284 serial_paranoia_check(info, tty->name, "esp_open");
2285 return -ENODEV;
2286 }
2287
2288 #ifdef SERIAL_DEBUG_OPEN
2289 printk("esp_open %s, count = %d\n", tty->name, info->count);
2290 #endif
2291 info->count++;
2292 tty->driver_data = info;
2293 info->tty = tty;
2294
2295 if (!tmp_buf) {
2296 tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
2297 if (!tmp_buf)
2298 return -ENOMEM;
2299 }
2300
2301 /*
2302 * Start up serial port
2303 */
2304 retval = startup(info);
2305 if (retval)
2306 return retval;
2307
2308 retval = block_til_ready(tty, filp, info);
2309 if (retval) {
2310 #ifdef SERIAL_DEBUG_OPEN
2311 printk("esp_open returning after block_til_ready with %d\n",
2312 retval);
2313 #endif
2314 return retval;
2315 }
2316
2317 #ifdef SERIAL_DEBUG_OPEN
2318 printk("esp_open %s successful...", tty->name);
2319 #endif
2320 return 0;
2321 }
2322
2323 /*
2324 * ---------------------------------------------------------------------
2325 * espserial_init() and friends
2326 *
2327 * espserial_init() is called at boot-time to initialize the serial driver.
2328 * ---------------------------------------------------------------------
2329 */
2330
2331 /*
2332 * This routine prints out the appropriate serial driver version
2333 * number, and identifies which options were configured into this
2334 * driver.
2335 */
2336
2337 static _INLINE_ void show_serial_version(void)
2338 {
2339 printk(KERN_INFO "%s version %s (DMA %u)\n",
2340 serial_name, serial_version, dma);
2341 }
2342
2343 /*
2344 * This routine is called by espserial_init() to initialize a specific serial
2345 * port.
2346 */
2347 static _INLINE_ int autoconfig(struct esp_struct * info, int *region_start)
2348 {
2349 int port_detected = 0;
2350 unsigned long flags;
2351
2352 save_flags(flags); cli();
2353
2354 /*
2355 * Check for ESP card
2356 */
2357
2358 if (!check_region(info->port, 8) &&
2359 serial_in(info, UART_ESI_BASE) == 0xf3) {
2360 serial_out(info, UART_ESI_CMD1, 0x00);
2361 serial_out(info, UART_ESI_CMD1, 0x01);
2362
2363 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2364 port_detected = 1;
2365
2366 if (!(info->irq)) {
2367 serial_out(info, UART_ESI_CMD1, 0x02);
2368
2369 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2370 info->irq = 3;
2371 else
2372 info->irq = 4;
2373 }
2374
2375 if (ports && (ports->port == (info->port - 8))) {
2376 release_region(*region_start,
2377 info->port - *region_start);
2378 } else
2379 *region_start = info->port;
2380
2381 if (!request_region(*region_start,
2382 info->port - *region_start + 8,
2383 "esp serial"))
2384 {
2385 restore_flags(flags);
2386 return -EIO;
2387 }
2388
2389 /* put card in enhanced mode */
2390 /* this prevents access through */
2391 /* the "old" IO ports */
2392 esp_basic_init(info);
2393
2394 /* clear out MCR */
2395 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2396 serial_out(info, UART_ESI_CMD2, UART_MCR);
2397 serial_out(info, UART_ESI_CMD2, 0x00);
2398 }
2399 }
2400
2401 restore_flags(flags);
2402 return (port_detected);
2403 }
2404
2405 static struct tty_operations esp_ops = {
2406 .open = esp_open,
2407 .close = rs_close,
2408 .write = rs_write,
2409 .put_char = rs_put_char,
2410 .flush_chars = rs_flush_chars,
2411 .write_room = rs_write_room,
2412 .chars_in_buffer = rs_chars_in_buffer,
2413 .flush_buffer = rs_flush_buffer,
2414 .ioctl = rs_ioctl,
2415 .throttle = rs_throttle,
2416 .unthrottle = rs_unthrottle,
2417 .set_termios = rs_set_termios,
2418 .stop = rs_stop,
2419 .start = rs_start,
2420 .hangup = esp_hangup,
2421 .break_ctl = esp_break,
2422 .wait_until_sent = rs_wait_until_sent,
2423 .tiocmget = esp_tiocmget,
2424 .tiocmset = esp_tiocmset,
2425 };
2426
2427 /*
2428 * The serial driver boot-time initialization code!
2429 */
2430 int __init espserial_init(void)
2431 {
2432 int i, offset;
2433 int region_start;
2434 struct esp_struct * info;
2435 struct esp_struct *last_primary = NULL;
2436 int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2437
2438 esp_driver = alloc_tty_driver(NR_PORTS);
2439 if (!esp_driver)
2440 return -ENOMEM;
2441
2442 for (i = 0; i < NR_PRIMARY; i++) {
2443 if (irq[i] != 0) {
2444 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2445 (irq[i] == 8) || (irq[i] == 13))
2446 irq[i] = 0;
2447 else if (irq[i] == 2)
2448 irq[i] = 9;
2449 }
2450 }
2451
2452 if ((dma != 1) && (dma != 3))
2453 dma = 0;
2454
2455 if ((rx_trigger < 1) || (rx_trigger > 1023))
2456 rx_trigger = 768;
2457
2458 if ((tx_trigger < 1) || (tx_trigger > 1023))
2459 tx_trigger = 768;
2460
2461 if ((flow_off < 1) || (flow_off > 1023))
2462 flow_off = 1016;
2463
2464 if ((flow_on < 1) || (flow_on > 1023))
2465 flow_on = 944;
2466
2467 if ((rx_timeout < 0) || (rx_timeout > 255))
2468 rx_timeout = 128;
2469
2470 if (flow_on >= flow_off)
2471 flow_on = flow_off - 1;
2472
2473 show_serial_version();
2474
2475 /* Initialize the tty_driver structure */
2476
2477 esp_driver->owner = THIS_MODULE;
2478 esp_driver->name = "ttyP";
2479 esp_driver->devfs_name = "tts/P";
2480 esp_driver->major = ESP_IN_MAJOR;
2481 esp_driver->minor_start = 0;
2482 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2483 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2484 esp_driver->init_termios = tty_std_termios;
2485 esp_driver->init_termios.c_cflag =
2486 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2487 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2488 tty_set_operations(esp_driver, &esp_ops);
2489 if (tty_register_driver(esp_driver))
2490 {
2491 printk(KERN_ERR "Couldn't register esp serial driver");
2492 put_tty_driver(esp_driver);
2493 return 1;
2494 }
2495
2496 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2497
2498 if (!info)
2499 {
2500 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2501 tty_unregister_driver(esp_driver);
2502 put_tty_driver(esp_driver);
2503 return 1;
2504 }
2505
2506 memset((void *)info, 0, sizeof(struct esp_struct));
2507 /* rx_trigger, tx_trigger are needed by autoconfig */
2508 info->config.rx_trigger = rx_trigger;
2509 info->config.tx_trigger = tx_trigger;
2510
2511 i = 0;
2512 offset = 0;
2513
2514 do {
2515 info->port = esp[i] + offset;
2516 info->irq = irq[i];
2517 info->line = (i * 8) + (offset / 8);
2518
2519 if (!autoconfig(info, &region_start)) {
2520 i++;
2521 offset = 0;
2522 continue;
2523 }
2524
2525 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2526 info->flags = STD_COM_FLAGS;
2527 if (info->custom_divisor)
2528 info->flags |= ASYNC_SPD_CUST;
2529 info->magic = ESP_MAGIC;
2530 info->close_delay = 5*HZ/10;
2531 info->closing_wait = 30*HZ;
2532 INIT_WORK(&info->tqueue, do_softint, info);
2533 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
2534 info->config.rx_timeout = rx_timeout;
2535 info->config.flow_on = flow_on;
2536 info->config.flow_off = flow_off;
2537 info->config.pio_threshold = pio_threshold;
2538 info->next_port = ports;
2539 init_waitqueue_head(&info->open_wait);
2540 init_waitqueue_head(&info->close_wait);
2541 init_waitqueue_head(&info->delta_msr_wait);
2542 init_waitqueue_head(&info->break_wait);
2543 ports = info;
2544 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2545 info->line, info->port, info->irq);
2546
2547 if (info->line % 8) {
2548 printk("secondary port\n");
2549 /* 8 port cards can't do DMA */
2550 info->stat_flags |= ESP_STAT_NEVER_DMA;
2551
2552 if (last_primary)
2553 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2554 } else {
2555 printk("primary port\n");
2556 last_primary = info;
2557 irq[i] = info->irq;
2558 }
2559
2560 if (!dma)
2561 info->stat_flags |= ESP_STAT_NEVER_DMA;
2562
2563 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2564 if (!info)
2565 {
2566 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2567
2568 /* allow use of the already detected ports */
2569 return 0;
2570 }
2571
2572 memset((void *)info, 0, sizeof(struct esp_struct));
2573 /* rx_trigger, tx_trigger are needed by autoconfig */
2574 info->config.rx_trigger = rx_trigger;
2575 info->config.tx_trigger = tx_trigger;
2576
2577 if (offset == 56) {
2578 i++;
2579 offset = 0;
2580 } else {
2581 offset += 8;
2582 }
2583 } while (i < NR_PRIMARY);
2584
2585 /* free the last port memory allocation */
2586 kfree(info);
2587
2588 return 0;
2589 }
2590
2591 static void __exit espserial_exit(void)
2592 {
2593 unsigned long flags;
2594 int e1;
2595 unsigned int region_start, region_end;
2596 struct esp_struct *temp_async;
2597 struct esp_pio_buffer *pio_buf;
2598
2599 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2600 save_flags(flags);
2601 cli();
2602 if ((e1 = tty_unregister_driver(esp_driver)))
2603 printk("SERIAL: failed to unregister serial driver (%d)\n",
2604 e1);
2605 restore_flags(flags);
2606 put_tty_driver(esp_driver);
2607
2608 while (ports) {
2609 if (ports->port) {
2610 region_start = region_end = ports->port;
2611 temp_async = ports;
2612
2613 while (temp_async) {
2614 if ((region_start - temp_async->port) == 8) {
2615 region_start = temp_async->port;
2616 temp_async->port = 0;
2617 temp_async = ports;
2618 } else if ((temp_async->port - region_end)
2619 == 8) {
2620 region_end = temp_async->port;
2621 temp_async->port = 0;
2622 temp_async = ports;
2623 } else
2624 temp_async = temp_async->next_port;
2625 }
2626
2627 release_region(region_start,
2628 region_end - region_start + 8);
2629 }
2630
2631 temp_async = ports->next_port;
2632 kfree(ports);
2633 ports = temp_async;
2634 }
2635
2636 if (dma_buffer)
2637 free_pages((unsigned long)dma_buffer,
2638 get_order(DMA_BUFFER_SZ));
2639
2640 if (tmp_buf)
2641 free_page((unsigned long)tmp_buf);
2642
2643 while (free_pio_buf) {
2644 pio_buf = free_pio_buf->next;
2645 kfree(free_pio_buf);
2646 free_pio_buf = pio_buf;
2647 }
2648 }
2649
2650 module_init(espserial_init);
2651 module_exit(espserial_exit);
MOXA 2.6.9 from sdlinux-moxaart.tgz