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[deliverable/linux.git] / drivers / char / esp.c
CommitLineData
1da177e4
LT		 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.
96de0e25 22 * Bernd Anhäupl 05/17/96.
1da177e4
LT		 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>
1977f032 61#include <linux/bitops.h>
1da177e4
LT		 62
63#include <asm/system.h>
64#include <asm/io.h>
1da177e4
LT		 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 */
77static int irq[NR_PRIMARY]; /* IRQ for each base port */
78static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
79static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
80static unsigned int rx_trigger = ESP_RX_TRIGGER;
81static unsigned int tx_trigger = ESP_TX_TRIGGER;
82static unsigned int flow_off = ESP_FLOW_OFF;
83static unsigned int flow_on = ESP_FLOW_ON;
84static unsigned int rx_timeout = ESP_RX_TMOUT;
85static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
86
87MODULE_LICENSE("GPL");
88
89module_param_array(irq, int, NULL, 0);
90module_param_array(divisor, uint, NULL, 0);
91module_param(dma, uint, 0);
92module_param(rx_trigger, uint, 0);
93module_param(tx_trigger, uint, 0);
94module_param(flow_off, uint, 0);
95module_param(flow_on, uint, 0);
96module_param(rx_timeout, uint, 0);
97module_param(pio_threshold, uint, 0);
98
99/* END */
100
101static char *dma_buffer;
102static int dma_bytes;
103static struct esp_pio_buffer *free_pio_buf;
104
105#define DMA_BUFFER_SZ 1024
106
107#define WAKEUP_CHARS 1024
108
109static char serial_name[] __initdata = "ESP serial driver";
110static char serial_version[] __initdata = "2.2";
111
112static struct tty_driver *esp_driver;
113
1da177e4
LT		 114/*
115 * Serial driver configuration section. Here are the various options:
116 *
117 * SERIAL_PARANOIA_CHECK
118 * Check the magic number for the esp_structure where
119 * ever possible.
120 */
121
122#undef SERIAL_PARANOIA_CHECK
123#define SERIAL_DO_RESTART
124
125#undef SERIAL_DEBUG_INTR
126#undef SERIAL_DEBUG_OPEN
127#undef SERIAL_DEBUG_FLOW
128
129#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
130#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
131 tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
132#else
133#define DBG_CNT(s)
134#endif
135
136static struct esp_struct *ports;
137
138static void change_speed(struct esp_struct *info);
139static void rs_wait_until_sent(struct tty_struct *, int);
140
141/*
142 * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
143 * times the normal 1.8432 Mhz clock of most serial boards).
144 */
145#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
146
147/* Standard COM flags (except for COM4, because of the 8514 problem) */
148#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
149
1da177e4
LT		 150static inline int serial_paranoia_check(struct esp_struct *info,
151 char *name, const char *routine)
152{
153#ifdef SERIAL_PARANOIA_CHECK
154 static const char badmagic[] = KERN_WARNING
155 "Warning: bad magic number for serial struct (%s) in %s\n";
156 static const char badinfo[] = KERN_WARNING
157 "Warning: null esp_struct for (%s) in %s\n";
158
159 if (!info) {
160 printk(badinfo, name, routine);
161 return 1;
162 }
163 if (info->magic != ESP_MAGIC) {
164 printk(badmagic, name, routine);
165 return 1;
166 }
167#endif
168 return 0;
169}
170
171static inline unsigned int serial_in(struct esp_struct *info, int offset)
172{
173 return inb(info->port + offset);
174}
175
176static inline void serial_out(struct esp_struct *info, int offset,
177 unsigned char value)
178{
179 outb(value, info->port+offset);
180}
181
182/*
183 * ------------------------------------------------------------
184 * rs_stop() and rs_start()
185 *
186 * This routines are called before setting or resetting tty->stopped.
187 * They enable or disable transmitter interrupts, as necessary.
188 * ------------------------------------------------------------
189 */
190static void rs_stop(struct tty_struct *tty)
191{
192 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
193 unsigned long flags;
194
195 if (serial_paranoia_check(info, tty->name, "rs_stop"))
196 return;
197
198 spin_lock_irqsave(&info->lock, flags);
199 if (info->IER & UART_IER_THRI) {
200 info->IER &= ~UART_IER_THRI;
201 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
202 serial_out(info, UART_ESI_CMD2, info->IER);
203 }
204 spin_unlock_irqrestore(&info->lock, flags);
205}
206
207static void rs_start(struct tty_struct *tty)
208{
209 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
210 unsigned long flags;
211
212 if (serial_paranoia_check(info, tty->name, "rs_start"))
213 return;
214
215 spin_lock_irqsave(&info->lock, flags);
216 if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
217 info->IER |= UART_IER_THRI;
218 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
219 serial_out(info, UART_ESI_CMD2, info->IER);
220 }
221 spin_unlock_irqrestore(&info->lock, flags);
222}
223
224/*
225 * ----------------------------------------------------------------------
226 *
227 * Here starts the interrupt handling routines. All of the following
228 * subroutines are declared as inline and are folded into
229 * rs_interrupt(). They were separated out for readability's sake.
230 *
231 * Note: rs_interrupt() is a "fast" interrupt, which means that it
232 * runs with interrupts turned off. People who may want to modify
233 * rs_interrupt() should try to keep the interrupt handler as fast as
234 * possible. After you are done making modifications, it is not a bad
235 * idea to do:
236 *
237 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
238 *
239 * and look at the resulting assemble code in serial.s.
240 *
241 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
242 * -----------------------------------------------------------------------
243 */
244
1da177e4
LT		 245static DEFINE_SPINLOCK(pio_lock);
246
247static inline struct esp_pio_buffer *get_pio_buffer(void)
248{
249 struct esp_pio_buffer *buf;
250 unsigned long flags;
251
252 spin_lock_irqsave(&pio_lock, flags);
253 if (free_pio_buf) {
254 buf = free_pio_buf;
255 free_pio_buf = buf->next;
256 } else {
257 buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
258 }
259 spin_unlock_irqrestore(&pio_lock, flags);
260 return buf;
261}
262
263static inline void release_pio_buffer(struct esp_pio_buffer *buf)
264{
265 unsigned long flags;
266 spin_lock_irqsave(&pio_lock, flags);
267 buf->next = free_pio_buf;
268 free_pio_buf = buf;
269 spin_unlock_irqrestore(&pio_lock, flags);
270}
271
272static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
273{
274 struct tty_struct *tty = info->tty;
275 int i;
276 struct esp_pio_buffer *pio_buf;
277 struct esp_pio_buffer *err_buf;
278 unsigned char status_mask;
279
280 pio_buf = get_pio_buffer();
281
282 if (!pio_buf)
283 return;
284
285 err_buf = get_pio_buffer();
286
287 if (!err_buf) {
288 release_pio_buffer(pio_buf);
289 return;
290 }
291
292 status_mask = (info->read_status_mask >> 2) & 0x07;
293
294 for (i = 0; i < num_bytes - 1; i += 2) {
295 *((unsigned short *)(pio_buf->data + i)) =
296 inw(info->port + UART_ESI_RX);
297 err_buf->data[i] = serial_in(info, UART_ESI_RWS);
298 err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
299 err_buf->data[i] &= status_mask;
300 }
301
302 if (num_bytes & 0x0001) {
303 pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
304 err_buf->data[num_bytes - 1] =
305 (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
306 }
307
308 /* make sure everything is still ok since interrupts were enabled */
309 tty = info->tty;
310
311 if (!tty) {
312 release_pio_buffer(pio_buf);
313 release_pio_buffer(err_buf);
314 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
315 return;
316 }
317
318 status_mask = (info->ignore_status_mask >> 2) & 0x07;
319
320 for (i = 0; i < num_bytes; i++) {
321 if (!(err_buf->data[i] & status_mask)) {
33f0f88f 322 int flag = 0;
1da177e4
LT		 323
324 if (err_buf->data[i] & 0x04) {
33f0f88f 325 flag = TTY_BREAK;
1da177e4
LT		 326 if (info->flags & ASYNC_SAK)
327 do_SAK(tty);
328 }
329 else if (err_buf->data[i] & 0x02)
33f0f88f 330 flag = TTY_FRAME;
1da177e4 331 else if (err_buf->data[i] & 0x01)
33f0f88f
AC		 332 flag = TTY_PARITY;
333 tty_insert_flip_char(tty, pio_buf->data[i], flag);
1da177e4
LT		 334 }
335 }
336
808249ce 337 tty_schedule_flip(tty);
1da177e4
LT		 338
339 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
340 release_pio_buffer(pio_buf);
341 release_pio_buffer(err_buf);
342}
343
344static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
345{
346 unsigned long flags;
347 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
348 dma_bytes = num_bytes;
349 info->stat_flags |= ESP_STAT_DMA_RX;
350
351 flags=claim_dma_lock();
352 disable_dma(dma);
353 clear_dma_ff(dma);
354 set_dma_mode(dma, DMA_MODE_READ);
355 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
356 set_dma_count(dma, dma_bytes);
357 enable_dma(dma);
358 release_dma_lock(flags);
359
360 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
361}
362
363static inline void receive_chars_dma_done(struct esp_struct *info,
364 int status)
365{
366 struct tty_struct *tty = info->tty;
367 int num_bytes;
368 unsigned long flags;
369
1da177e4
LT		 370 flags=claim_dma_lock();
371 disable_dma(dma);
372 clear_dma_ff(dma);
373
374 info->stat_flags &= ~ESP_STAT_DMA_RX;
375 num_bytes = dma_bytes - get_dma_residue(dma);
376 release_dma_lock(flags);
377
378 info->icount.rx += num_bytes;
379
1da177e4 380 if (num_bytes > 0) {
33f0f88f 381 tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
1da177e4
LT		 382
383 status &= (0x1c & info->read_status_mask);
33f0f88f
AC		 384
385 /* Is the status significant or do we throw the last byte ? */
386 if (!(status & info->ignore_status_mask)) {
387 int statflag = 0;
1da177e4 388
33f0f88f
AC		 389 if (status & 0x10) {
390 statflag = TTY_BREAK;
391 (info->icount.brk)++;
392 if (info->flags & ASYNC_SAK)
393 do_SAK(tty);
394 } else if (status & 0x08) {
395 statflag = TTY_FRAME;
396 (info->icount.frame)++;
397 }
398 else if (status & 0x04) {
399 statflag = TTY_PARITY;
400 (info->icount.parity)++;
401 }
402 tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag);
1da177e4 403 }
808249ce 404 tty_schedule_flip(tty);
1da177e4
LT		 405 }
406
407 if (dma_bytes != num_bytes) {
408 num_bytes = dma_bytes - num_bytes;
409 dma_bytes = 0;
410 receive_chars_dma(info, num_bytes);
411 } else
412 dma_bytes = 0;
413}
414
415/* Caller must hold info->lock */
416
417static inline void transmit_chars_pio(struct esp_struct *info,
418 int space_avail)
419{
420 int i;
421 struct esp_pio_buffer *pio_buf;
422
423 pio_buf = get_pio_buffer();
424
425 if (!pio_buf)
426 return;
427
428 while (space_avail && info->xmit_cnt) {
429 if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
430 memcpy(pio_buf->data,
431 &(info->xmit_buf[info->xmit_tail]),
432 space_avail);
433 } else {
434 i = ESP_XMIT_SIZE - info->xmit_tail;
435 memcpy(pio_buf->data,
436 &(info->xmit_buf[info->xmit_tail]), i);
437 memcpy(&(pio_buf->data[i]), info->xmit_buf,
438 space_avail - i);
439 }
440
441 info->xmit_cnt -= space_avail;
442 info->xmit_tail = (info->xmit_tail + space_avail) &
443 (ESP_XMIT_SIZE - 1);
444
445 for (i = 0; i < space_avail - 1; i += 2) {
446 outw(*((unsigned short *)(pio_buf->data + i)),
447 info->port + UART_ESI_TX);
448 }
449
450 if (space_avail & 0x0001)
451 serial_out(info, UART_ESI_TX,
452 pio_buf->data[space_avail - 1]);
453
454 if (info->xmit_cnt) {
455 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
456 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
457 space_avail = serial_in(info, UART_ESI_STAT1) << 8;
458 space_avail |= serial_in(info, UART_ESI_STAT2);
459
460 if (space_avail > info->xmit_cnt)
461 space_avail = info->xmit_cnt;
462 }
463 }
464
465 if (info->xmit_cnt < WAKEUP_CHARS) {
d2e7a4b6
JS		 466 if (info->tty)
467 tty_wakeup(info->tty);
1da177e4
LT		 468
469#ifdef SERIAL_DEBUG_INTR
470 printk("THRE...");
471#endif
472
473 if (info->xmit_cnt <= 0) {
474 info->IER &= ~UART_IER_THRI;
475 serial_out(info, UART_ESI_CMD1,
476 ESI_SET_SRV_MASK);
477 serial_out(info, UART_ESI_CMD2, info->IER);
478 }
479 }
480
481 release_pio_buffer(pio_buf);
482}
483
484/* Caller must hold info->lock */
485static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
486{
487 unsigned long flags;
488
489 dma_bytes = num_bytes;
490
491 if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
492 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
493 dma_bytes);
494 } else {
495 int i = ESP_XMIT_SIZE - info->xmit_tail;
496 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
497 i);
498 memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
499 }
500
501 info->xmit_cnt -= dma_bytes;
502 info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
503
504 if (info->xmit_cnt < WAKEUP_CHARS) {
d2e7a4b6
JS		 505 if (info->tty)
506 tty_wakeup(info->tty);
1da177e4
LT		 507
508#ifdef SERIAL_DEBUG_INTR
509 printk("THRE...");
510#endif
511
512 if (info->xmit_cnt <= 0) {
513 info->IER &= ~UART_IER_THRI;
514 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
515 serial_out(info, UART_ESI_CMD2, info->IER);
516 }
517 }
518
519 info->stat_flags |= ESP_STAT_DMA_TX;
520
521 flags=claim_dma_lock();
522 disable_dma(dma);
523 clear_dma_ff(dma);
524 set_dma_mode(dma, DMA_MODE_WRITE);
525 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
526 set_dma_count(dma, dma_bytes);
527 enable_dma(dma);
528 release_dma_lock(flags);
529
530 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
531}
532
533static inline void transmit_chars_dma_done(struct esp_struct *info)
534{
535 int num_bytes;
536 unsigned long flags;
537
538
539 flags=claim_dma_lock();
540 disable_dma(dma);
541 clear_dma_ff(dma);
542
543 num_bytes = dma_bytes - get_dma_residue(dma);
544 info->icount.tx += dma_bytes;
545 release_dma_lock(flags);
546
547 if (dma_bytes != num_bytes) {
548 dma_bytes -= num_bytes;
549 memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
550
551 flags=claim_dma_lock();
552 disable_dma(dma);
553 clear_dma_ff(dma);
554 set_dma_mode(dma, DMA_MODE_WRITE);
555 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
556 set_dma_count(dma, dma_bytes);
557 enable_dma(dma);
558 release_dma_lock(flags);
559
560 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
561 } else {
562 dma_bytes = 0;
563 info->stat_flags &= ~ESP_STAT_DMA_TX;
564 }
565}
566
567static inline void check_modem_status(struct esp_struct *info)
568{
569 int status;
570
571 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
572 status = serial_in(info, UART_ESI_STAT2);
573
574 if (status & UART_MSR_ANY_DELTA) {
575 /* update input line counters */
576 if (status & UART_MSR_TERI)
577 info->icount.rng++;
578 if (status & UART_MSR_DDSR)
579 info->icount.dsr++;
580 if (status & UART_MSR_DDCD)
581 info->icount.dcd++;
582 if (status & UART_MSR_DCTS)
583 info->icount.cts++;
584 wake_up_interruptible(&info->delta_msr_wait);
585 }
586
587 if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
588#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
589 printk("ttys%d CD now %s...", info->line,
590 (status & UART_MSR_DCD) ? "on" : "off");
591#endif
592 if (status & UART_MSR_DCD)
593 wake_up_interruptible(&info->open_wait);
594 else {
595#ifdef SERIAL_DEBUG_OPEN
596 printk("scheduling hangup...");
597#endif
d2e7a4b6 598 tty_hangup(info->tty);
1da177e4
LT		 599 }
600 }
601}
602
603/*
604 * This is the serial driver's interrupt routine
605 */
7d12e780 606static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
1da177e4
LT		 607{
608 struct esp_struct * info;
609 unsigned err_status;
610 unsigned int scratch;
611
612#ifdef SERIAL_DEBUG_INTR
613 printk("rs_interrupt_single(%d)...", irq);
614#endif
615 info = (struct esp_struct *)dev_id;
616 err_status = 0;
617 scratch = serial_in(info, UART_ESI_SID);
618
619 spin_lock(&info->lock);
620
621 if (!info->tty) {
622 spin_unlock(&info->lock);
623 return IRQ_NONE;
624 }
625
626 if (scratch & 0x04) { /* error */
627 serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
628 err_status = serial_in(info, UART_ESI_STAT1);
629 serial_in(info, UART_ESI_STAT2);
630
631 if (err_status & 0x01)
632 info->stat_flags |= ESP_STAT_RX_TIMEOUT;
633
634 if (err_status & 0x20) /* UART status */
635 check_modem_status(info);
636
637 if (err_status & 0x80) /* Start break */
638 wake_up_interruptible(&info->break_wait);
639 }
640
641 if ((scratch & 0x88) || /* DMA completed or timed out */
642 (err_status & 0x1c) /* receive error */) {
643 if (info->stat_flags & ESP_STAT_DMA_RX)
644 receive_chars_dma_done(info, err_status);
645 else if (info->stat_flags & ESP_STAT_DMA_TX)
646 transmit_chars_dma_done(info);
647 }
648
649 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
650 ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
651 (info->IER & UART_IER_RDI)) {
652 int num_bytes;
653
654 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
655 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
656 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
657 num_bytes |= serial_in(info, UART_ESI_STAT2);
658
33f0f88f 659 num_bytes = tty_buffer_request_room(info->tty, num_bytes);
1da177e4
LT		 660
661 if (num_bytes) {
662 if (dma_bytes ||
663 (info->stat_flags & ESP_STAT_USE_PIO) ||
664 (num_bytes <= info->config.pio_threshold))
665 receive_chars_pio(info, num_bytes);
666 else
667 receive_chars_dma(info, num_bytes);
668 }
669 }
670
671 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
672 (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
673 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
674 info->IER &= ~UART_IER_THRI;
675 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
676 serial_out(info, UART_ESI_CMD2, info->IER);
677 } else {
678 int num_bytes;
679
680 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
681 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
682 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
683 num_bytes |= serial_in(info, UART_ESI_STAT2);
684
685 if (num_bytes > info->xmit_cnt)
686 num_bytes = info->xmit_cnt;
687
688 if (num_bytes) {
689 if (dma_bytes ||
690 (info->stat_flags & ESP_STAT_USE_PIO) ||
691 (num_bytes <= info->config.pio_threshold))
692 transmit_chars_pio(info, num_bytes);
693 else
694 transmit_chars_dma(info, num_bytes);
695 }
696 }
697 }
698
699 info->last_active = jiffies;
700
701#ifdef SERIAL_DEBUG_INTR
702 printk("end.\n");
703#endif
704 spin_unlock(&info->lock);
705 return IRQ_HANDLED;
706}
707
708/*
709 * -------------------------------------------------------------------
710 * Here ends the serial interrupt routines.
711 * -------------------------------------------------------------------
712 */
713
1da177e4
LT		 714/*
715 * ---------------------------------------------------------------
716 * Low level utility subroutines for the serial driver: routines to
717 * figure out the appropriate timeout for an interrupt chain, routines
718 * to initialize and startup a serial port, and routines to shutdown a
719 * serial port. Useful stuff like that.
720 *
721 * Caller should hold lock
722 * ---------------------------------------------------------------
723 */
724
725static inline void esp_basic_init(struct esp_struct * info)
726{
727 /* put ESPC in enhanced mode */
728 serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
729
730 if (info->stat_flags & ESP_STAT_NEVER_DMA)
731 serial_out(info, UART_ESI_CMD2, 0x01);
732 else
733 serial_out(info, UART_ESI_CMD2, 0x31);
734
735 /* disable interrupts for now */
736 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
737 serial_out(info, UART_ESI_CMD2, 0x00);
738
739 /* set interrupt and DMA channel */
740 serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
741
742 if (info->stat_flags & ESP_STAT_NEVER_DMA)
743 serial_out(info, UART_ESI_CMD2, 0x01);
744 else
745 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
746
747 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
748
749 if (info->line % 8) /* secondary port */
750 serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
751 else if (info->irq == 9)
752 serial_out(info, UART_ESI_CMD2, 0x02);
753 else
754 serial_out(info, UART_ESI_CMD2, info->irq);
755
756 /* set error status mask (check this) */
757 serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
758
759 if (info->stat_flags & ESP_STAT_NEVER_DMA)
760 serial_out(info, UART_ESI_CMD2, 0xa1);
761 else
762 serial_out(info, UART_ESI_CMD2, 0xbd);
763
764 serial_out(info, UART_ESI_CMD2, 0x00);
765
766 /* set DMA timeout */
767 serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
768 serial_out(info, UART_ESI_CMD2, 0xff);
769
770 /* set FIFO trigger levels */
771 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
772 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
773 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
774 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
775 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
776
777 /* Set clock scaling and wait states */
778 serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
779 serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
780
781 /* set reinterrupt pacing */
782 serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
783 serial_out(info, UART_ESI_CMD2, 0xff);
784}
785
786static int startup(struct esp_struct * info)
787{
788 unsigned long flags;
789 int retval=0;
790 unsigned int num_chars;
791
792 spin_lock_irqsave(&info->lock, flags);
793
794 if (info->flags & ASYNC_INITIALIZED)
795 goto out;
796
797 if (!info->xmit_buf) {
798 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
799 retval = -ENOMEM;
800 if (!info->xmit_buf)
801 goto out;
802 }
803
804#ifdef SERIAL_DEBUG_OPEN
805 printk("starting up ttys%d (irq %d)...", info->line, info->irq);
806#endif
807
808 /* Flush the RX buffer. Using the ESI flush command may cause */
809 /* wild interrupts, so read all the data instead. */
810
811 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
812 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
813 num_chars = serial_in(info, UART_ESI_STAT1) << 8;
814 num_chars |= serial_in(info, UART_ESI_STAT2);
815
816 while (num_chars > 1) {
817 inw(info->port + UART_ESI_RX);
818 num_chars -= 2;
819 }
820
821 if (num_chars)
822 serial_in(info, UART_ESI_RX);
823
824 /* set receive character timeout */
825 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
826 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
827
828 /* clear all flags except the "never DMA" flag */
829 info->stat_flags &= ESP_STAT_NEVER_DMA;
830
831 if (info->stat_flags & ESP_STAT_NEVER_DMA)
832 info->stat_flags |= ESP_STAT_USE_PIO;
833
834 spin_unlock_irqrestore(&info->lock, flags);
835
836 /*
837 * Allocate the IRQ
838 */
839
0f2ed4c6 840 retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
1da177e4
LT		 841 "esp serial", info);
842
843 if (retval) {
844 if (capable(CAP_SYS_ADMIN)) {
845 if (info->tty)
846 set_bit(TTY_IO_ERROR,
847 &info->tty->flags);
848 retval = 0;
849 }
850 goto out_unlocked;
851 }
852
853 if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
854 dma_buffer = (char *)__get_dma_pages(
855 GFP_KERNEL, get_order(DMA_BUFFER_SZ));
856
857 /* use PIO mode if DMA buf/chan cannot be allocated */
858 if (!dma_buffer)
859 info->stat_flags |= ESP_STAT_USE_PIO;
860 else if (request_dma(dma, "esp serial")) {
861 free_pages((unsigned long)dma_buffer,
862 get_order(DMA_BUFFER_SZ));
863 dma_buffer = NULL;
864 info->stat_flags |= ESP_STAT_USE_PIO;
865 }
866
867 }
868
869 info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
870
871 spin_lock_irqsave(&info->lock, flags);
872 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
873 serial_out(info, UART_ESI_CMD2, UART_MCR);
874 serial_out(info, UART_ESI_CMD2, info->MCR);
875
876 /*
877 * Finally, enable interrupts
878 */
879 /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
880 info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
881 UART_IER_DMA_TC;
882 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
883 serial_out(info, UART_ESI_CMD2, info->IER);
884
885 if (info->tty)
886 clear_bit(TTY_IO_ERROR, &info->tty->flags);
887 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
888 spin_unlock_irqrestore(&info->lock, flags);
889
890 /*
891 * Set up the tty->alt_speed kludge
892 */
893 if (info->tty) {
894 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
895 info->tty->alt_speed = 57600;
896 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
897 info->tty->alt_speed = 115200;
898 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
899 info->tty->alt_speed = 230400;
900 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
901 info->tty->alt_speed = 460800;
902 }
903
904 /*
905 * set the speed of the serial port
906 */
907 change_speed(info);
908 info->flags |= ASYNC_INITIALIZED;
909 return 0;
910
911out:
912 spin_unlock_irqrestore(&info->lock, flags);
913out_unlocked:
914 return retval;
915}
916
917/*
918 * This routine will shutdown a serial port; interrupts are disabled, and
919 * DTR is dropped if the hangup on close termio flag is on.
920 */
921static void shutdown(struct esp_struct * info)
922{
923 unsigned long flags, f;
924
925 if (!(info->flags & ASYNC_INITIALIZED))
926 return;
927
928#ifdef SERIAL_DEBUG_OPEN
929 printk("Shutting down serial port %d (irq %d)....", info->line,
930 info->irq);
931#endif
932
933 spin_lock_irqsave(&info->lock, flags);
934 /*
935 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
936 * here so the queue might never be waken up
937 */
938 wake_up_interruptible(&info->delta_msr_wait);
939 wake_up_interruptible(&info->break_wait);
940
941 /* stop a DMA transfer on the port being closed */
942 /* DMA lock is higher priority always */
943 if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
944 f=claim_dma_lock();
945 disable_dma(dma);
946 clear_dma_ff(dma);
947 release_dma_lock(f);
948
949 dma_bytes = 0;
950 }
951
952 /*
953 * Free the IRQ
954 */
955 free_irq(info->irq, info);
956
957 if (dma_buffer) {
958 struct esp_struct *current_port = ports;
959
960 while (current_port) {
961 if ((current_port != info) &&
962 (current_port->flags & ASYNC_INITIALIZED))
963 break;
964
965 current_port = current_port->next_port;
966 }
967
968 if (!current_port) {
969 free_dma(dma);
970 free_pages((unsigned long)dma_buffer,
971 get_order(DMA_BUFFER_SZ));
972 dma_buffer = NULL;
973 }
974 }
975
976 if (info->xmit_buf) {
977 free_page((unsigned long) info->xmit_buf);
978 info->xmit_buf = NULL;
979 }
980
981 info->IER = 0;
982 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
983 serial_out(info, UART_ESI_CMD2, 0x00);
984
985 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
986 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
987
988 info->MCR &= ~UART_MCR_OUT2;
989 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
990 serial_out(info, UART_ESI_CMD2, UART_MCR);
991 serial_out(info, UART_ESI_CMD2, info->MCR);
992
993 if (info->tty)
994 set_bit(TTY_IO_ERROR, &info->tty->flags);
995
996 info->flags &= ~ASYNC_INITIALIZED;
997 spin_unlock_irqrestore(&info->lock, flags);
998}
999
1000/*
1001 * This routine is called to set the UART divisor registers to match
1002 * the specified baud rate for a serial port.
1003 */
1004static void change_speed(struct esp_struct *info)
1005{
1006 unsigned short port;
1007 int quot = 0;
1008 unsigned cflag,cval;
1009 int baud, bits;
1010 unsigned char flow1 = 0, flow2 = 0;
1011 unsigned long flags;
1012
1013 if (!info->tty || !info->tty->termios)
1014 return;
1015 cflag = info->tty->termios->c_cflag;
1016 port = info->port;
1017
1018 /* byte size and parity */
1019 switch (cflag & CSIZE) {
1020 case CS5: cval = 0x00; bits = 7; break;
1021 case CS6: cval = 0x01; bits = 8; break;
1022 case CS7: cval = 0x02; bits = 9; break;
1023 case CS8: cval = 0x03; bits = 10; break;
1024 default: cval = 0x00; bits = 7; break;
1025 }
1026 if (cflag & CSTOPB) {
1027 cval |= 0x04;
1028 bits++;
1029 }
1030 if (cflag & PARENB) {
1031 cval |= UART_LCR_PARITY;
1032 bits++;
1033 }
1034 if (!(cflag & PARODD))
1035 cval |= UART_LCR_EPAR;
1036#ifdef CMSPAR
1037 if (cflag & CMSPAR)
1038 cval |= UART_LCR_SPAR;
1039#endif
1040
1041 baud = tty_get_baud_rate(info->tty);
1042 if (baud == 38400 &&
1043 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1044 quot = info->custom_divisor;
1045 else {
1046 if (baud == 134)
1047 /* Special case since 134 is really 134.5 */
1048 quot = (2*BASE_BAUD / 269);
1049 else if (baud)
1050 quot = BASE_BAUD / baud;
1051 }
1052 /* If the quotient is ever zero, default to 9600 bps */
1053 if (!quot)
1054 quot = BASE_BAUD / 9600;
1055
1056 info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1057
1058 /* CTS flow control flag and modem status interrupts */
1059 /* info->IER &= ~UART_IER_MSI; */
1060 if (cflag & CRTSCTS) {
1061 info->flags |= ASYNC_CTS_FLOW;
1062 /* info->IER |= UART_IER_MSI; */
1063 flow1 = 0x04;
1064 flow2 = 0x10;
1065 } else
1066 info->flags &= ~ASYNC_CTS_FLOW;
1067 if (cflag & CLOCAL)
1068 info->flags &= ~ASYNC_CHECK_CD;
1069 else {
1070 info->flags |= ASYNC_CHECK_CD;
1071 /* info->IER |= UART_IER_MSI; */
1072 }
1073
1074 /*
1075 * Set up parity check flag
1076 */
1da177e4
LT		 1077 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1078 if (I_INPCK(info->tty))
1079 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1080 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1081 info->read_status_mask |= UART_LSR_BI;
1082
1083 info->ignore_status_mask = 0;
1084#if 0
1085 /* This should be safe, but for some broken bits of hardware... */
1086 if (I_IGNPAR(info->tty)) {
1087 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1088 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1089 }
1090#endif
1091 if (I_IGNBRK(info->tty)) {
1092 info->ignore_status_mask |= UART_LSR_BI;
1093 info->read_status_mask |= UART_LSR_BI;
1094 /*
1095 * If we're ignore parity and break indicators, ignore
1096 * overruns too. (For real raw support).
1097 */
1098 if (I_IGNPAR(info->tty)) {
1099 info->ignore_status_mask |= UART_LSR_OE | \
1100 UART_LSR_PE | UART_LSR_FE;
1101 info->read_status_mask |= UART_LSR_OE | \
1102 UART_LSR_PE | UART_LSR_FE;
1103 }
1104 }
1105
1106 if (I_IXOFF(info->tty))
1107 flow1 |= 0x81;
1108
1109 spin_lock_irqsave(&info->lock, flags);
1110 /* set baud */
1111 serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1112 serial_out(info, UART_ESI_CMD2, quot >> 8);
1113 serial_out(info, UART_ESI_CMD2, quot & 0xff);
1114
1115 /* set data bits, parity, etc. */
1116 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1117 serial_out(info, UART_ESI_CMD2, UART_LCR);
1118 serial_out(info, UART_ESI_CMD2, cval);
1119
1120 /* Enable flow control */
1121 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1122 serial_out(info, UART_ESI_CMD2, flow1);
1123 serial_out(info, UART_ESI_CMD2, flow2);
1124
1125 /* set flow control characters (XON/XOFF only) */
1126 if (I_IXOFF(info->tty)) {
1127 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1128 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1129 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1130 serial_out(info, UART_ESI_CMD2, 0x10);
1131 serial_out(info, UART_ESI_CMD2, 0x21);
1132 switch (cflag & CSIZE) {
1133 case CS5:
1134 serial_out(info, UART_ESI_CMD2, 0x1f);
1135 break;
1136 case CS6:
1137 serial_out(info, UART_ESI_CMD2, 0x3f);
1138 break;
1139 case CS7:
1140 case CS8:
1141 serial_out(info, UART_ESI_CMD2, 0x7f);
1142 break;
1143 default:
1144 serial_out(info, UART_ESI_CMD2, 0xff);
1145 break;
1146 }
1147 }
1148
1149 /* Set high/low water */
1150 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1151 serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1152 serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1153 serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1154 serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1155
1156 spin_unlock_irqrestore(&info->lock, flags);
1157}
1158
1159static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1160{
1161 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1162 unsigned long flags;
1163
1164 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1165 return;
1166
a2f20c7c 1167 if (!info->xmit_buf)
1da177e4
LT		 1168 return;
1169
1170 spin_lock_irqsave(&info->lock, flags);
1171 if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
1172 info->xmit_buf[info->xmit_head++] = ch;
1173 info->xmit_head &= ESP_XMIT_SIZE-1;
1174 info->xmit_cnt++;
1175 }
1176 spin_unlock_irqrestore(&info->lock, flags);
1177}
1178
1179static void rs_flush_chars(struct tty_struct *tty)
1180{
1181 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1182 unsigned long flags;
1183
1184 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1185 return;
1186
1187 spin_lock_irqsave(&info->lock, flags);
1188
1189 if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1190 goto out;
1191
1192 if (!(info->IER & UART_IER_THRI)) {
1193 info->IER |= UART_IER_THRI;
1194 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1195 serial_out(info, UART_ESI_CMD2, info->IER);
1196 }
1197out:
1198 spin_unlock_irqrestore(&info->lock, flags);
1199}
1200
1201static int rs_write(struct tty_struct * tty,
1202 const unsigned char *buf, int count)
1203{
1204 int c, t, ret = 0;
1205 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1206 unsigned long flags;
1207
1208 if (serial_paranoia_check(info, tty->name, "rs_write"))
1209 return 0;
1210
a2f20c7c 1211 if (!info->xmit_buf)
1da177e4
LT		 1212 return 0;
1213
1214 while (1) {
1215 /* Thanks to R. Wolff for suggesting how to do this with */
1216 /* interrupts enabled */
1217
1218 c = count;
1219 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1220
1221 if (t < c)
1222 c = t;
1223
1224 t = ESP_XMIT_SIZE - info->xmit_head;
1225
1226 if (t < c)
1227 c = t;
1228
1229 if (c <= 0)
1230 break;
1231
1232 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1233
1234 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1235 info->xmit_cnt += c;
1236 buf += c;
1237 count -= c;
1238 ret += c;
1239 }
1240
1241 spin_lock_irqsave(&info->lock, flags);
1242
1243 if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1244 info->IER |= UART_IER_THRI;
1245 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1246 serial_out(info, UART_ESI_CMD2, info->IER);
1247 }
1248
1249 spin_unlock_irqrestore(&info->lock, flags);
1250 return ret;
1251}
1252
1253static int rs_write_room(struct tty_struct *tty)
1254{
1255 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1256 int ret;
1257 unsigned long flags;
1258
1259 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1260 return 0;
1261
1262 spin_lock_irqsave(&info->lock, flags);
1263
1264 ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1265 if (ret < 0)
1266 ret = 0;
1267 spin_unlock_irqrestore(&info->lock, flags);
1268 return ret;
1269}
1270
1271static int rs_chars_in_buffer(struct tty_struct *tty)
1272{
1273 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1274
1275 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1276 return 0;
1277 return info->xmit_cnt;
1278}
1279
1280static void rs_flush_buffer(struct tty_struct *tty)
1281{
1282 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1283 unsigned long flags;
1284
1285 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1286 return;
1287 spin_lock_irqsave(&info->lock, flags);
1288 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1289 spin_unlock_irqrestore(&info->lock, flags);
1290 tty_wakeup(tty);
1291}
1292
1293/*
1294 * ------------------------------------------------------------
1295 * rs_throttle()
1296 *
1297 * This routine is called by the upper-layer tty layer to signal that
1298 * incoming characters should be throttled.
1299 * ------------------------------------------------------------
1300 */
1301static void rs_throttle(struct tty_struct * tty)
1302{
1303 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1304 unsigned long flags;
1305#ifdef SERIAL_DEBUG_THROTTLE
1306 char buf[64];
1307
1308 printk("throttle %s: %d....\n", tty_name(tty, buf),
1309 tty->ldisc.chars_in_buffer(tty));
1310#endif
1311
1312 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1313 return;
1314
1315 spin_lock_irqsave(&info->lock, flags);
1316 info->IER &= ~UART_IER_RDI;
1317 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1318 serial_out(info, UART_ESI_CMD2, info->IER);
1319 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1320 serial_out(info, UART_ESI_CMD2, 0x00);
1321 spin_unlock_irqrestore(&info->lock, flags);
1322}
1323
1324static void rs_unthrottle(struct tty_struct * tty)
1325{
1326 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1327 unsigned long flags;
1328#ifdef SERIAL_DEBUG_THROTTLE
1329 char buf[64];
1330
1331 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1332 tty->ldisc.chars_in_buffer(tty));
1333#endif
1334
1335 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1336 return;
1337
1338 spin_lock_irqsave(&info->lock, flags);
1339 info->IER |= UART_IER_RDI;
1340 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1341 serial_out(info, UART_ESI_CMD2, info->IER);
1342 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1343 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1344 spin_unlock_irqrestore(&info->lock, flags);
1345}
1346
1347/*
1348 * ------------------------------------------------------------
1349 * rs_ioctl() and friends
1350 * ------------------------------------------------------------
1351 */
1352
1353static int get_serial_info(struct esp_struct * info,
1354 struct serial_struct __user *retinfo)
1355{
1356 struct serial_struct tmp;
1357
5a4bc8c1 1358 lock_kernel();
1da177e4
LT		 1359 memset(&tmp, 0, sizeof(tmp));
1360 tmp.type = PORT_16550A;
1361 tmp.line = info->line;
1362 tmp.port = info->port;
1363 tmp.irq = info->irq;
1364 tmp.flags = info->flags;
1365 tmp.xmit_fifo_size = 1024;
1366 tmp.baud_base = BASE_BAUD;
1367 tmp.close_delay = info->close_delay;
1368 tmp.closing_wait = info->closing_wait;
1369 tmp.custom_divisor = info->custom_divisor;
1370 tmp.hub6 = 0;
5a4bc8c1 1371 unlock_kernel();
1da177e4
LT		 1372 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1373 return -EFAULT;
1374 return 0;
1375}
1376
1377static int get_esp_config(struct esp_struct * info,
1378 struct hayes_esp_config __user *retinfo)
1379{
1380 struct hayes_esp_config tmp;
1381
1382 if (!retinfo)
1383 return -EFAULT;
1384
1385 memset(&tmp, 0, sizeof(tmp));
5a4bc8c1 1386 lock_kernel();
1da177e4
LT		 1387 tmp.rx_timeout = info->config.rx_timeout;
1388 tmp.rx_trigger = info->config.rx_trigger;
1389 tmp.tx_trigger = info->config.tx_trigger;
1390 tmp.flow_off = info->config.flow_off;
1391 tmp.flow_on = info->config.flow_on;
1392 tmp.pio_threshold = info->config.pio_threshold;
1393 tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
5a4bc8c1 1394 unlock_kernel();
1da177e4
LT		 1395
1396 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1397}
1398
1399static int set_serial_info(struct esp_struct * info,
1400 struct serial_struct __user *new_info)
1401{
1402 struct serial_struct new_serial;
1403 struct esp_struct old_info;
1404 unsigned int change_irq;
1405 int retval = 0;
1406 struct esp_struct *current_async;
1407
1408 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1409 return -EFAULT;
1410 old_info = *info;
1411
1412 if ((new_serial.type != PORT_16550A) ||
1413 (new_serial.hub6) ||
1414 (info->port != new_serial.port) ||
1415 (new_serial.baud_base != BASE_BAUD) ||
1416 (new_serial.irq > 15) ||
1417 (new_serial.irq < 2) ||
1418 (new_serial.irq == 6) ||
1419 (new_serial.irq == 8) ||
1420 (new_serial.irq == 13))
1421 return -EINVAL;
1422
1423 change_irq = new_serial.irq != info->irq;
1424
1425 if (change_irq && (info->line % 8))
1426 return -EINVAL;
1427
1428 if (!capable(CAP_SYS_ADMIN)) {
1429 if (change_irq ||
1430 (new_serial.close_delay != info->close_delay) ||
1431 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1432 (info->flags & ~ASYNC_USR_MASK)))
1433 return -EPERM;
1434 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1435 (new_serial.flags & ASYNC_USR_MASK));
1436 info->custom_divisor = new_serial.custom_divisor;
1437 } else {
1438 if (new_serial.irq == 2)
1439 new_serial.irq = 9;
1440
1441 if (change_irq) {
1442 current_async = ports;
1443
1444 while (current_async) {
1445 if ((current_async->line >= info->line) &&
1446 (current_async->line < (info->line + 8))) {
1447 if (current_async == info) {
1448 if (current_async->count > 1)
1449 return -EBUSY;
1450 } else if (current_async->count)
1451 return -EBUSY;
1452 }
1453
1454 current_async = current_async->next_port;
1455 }
1456 }
1457
1458 /*
1459 * OK, past this point, all the error checking has been done.
1460 * At this point, we start making changes.....
1461 */
1462
1463 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1464 (new_serial.flags & ASYNC_FLAGS));
1465 info->custom_divisor = new_serial.custom_divisor;
1466 info->close_delay = new_serial.close_delay * HZ/100;
1467 info->closing_wait = new_serial.closing_wait * HZ/100;
1468
1469 if (change_irq) {
1470 /*
1471 * We need to shutdown the serial port at the old
1472 * port/irq combination.
1473 */
1474 shutdown(info);
1475
1476 current_async = ports;
1477
1478 while (current_async) {
1479 if ((current_async->line >= info->line) &&
1480 (current_async->line < (info->line + 8)))
1481 current_async->irq = new_serial.irq;
1482
1483 current_async = current_async->next_port;
1484 }
1485
1486 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1487 if (info->irq == 9)
1488 serial_out(info, UART_ESI_CMD2, 0x02);
1489 else
1490 serial_out(info, UART_ESI_CMD2, info->irq);
1491 }
1492 }
1493
1494 if (info->flags & ASYNC_INITIALIZED) {
1495 if (((old_info.flags & ASYNC_SPD_MASK) !=
1496 (info->flags & ASYNC_SPD_MASK)) ||
1497 (old_info.custom_divisor != info->custom_divisor)) {
1498 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1499 info->tty->alt_speed = 57600;
1500 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1501 info->tty->alt_speed = 115200;
1502 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1503 info->tty->alt_speed = 230400;
1504 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1505 info->tty->alt_speed = 460800;
1506 change_speed(info);
1507 }
1508 } else
1509 retval = startup(info);
1510
1511 return retval;
1512}
1513
1514static int set_esp_config(struct esp_struct * info,
1515 struct hayes_esp_config __user * new_info)
1516{
1517 struct hayes_esp_config new_config;
1518 unsigned int change_dma;
1519 int retval = 0;
1520 struct esp_struct *current_async;
1521 unsigned long flags;
1522
1523 /* Perhaps a non-sysadmin user should be able to do some of these */
1524 /* operations. I haven't decided yet. */
1525
1526 if (!capable(CAP_SYS_ADMIN))
1527 return -EPERM;
1528
1529 if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1530 return -EFAULT;
1531
1532 if ((new_config.flow_on >= new_config.flow_off) ||
1533 (new_config.rx_trigger < 1) ||
1534 (new_config.tx_trigger < 1) ||
1535 (new_config.flow_off < 1) ||
1536 (new_config.flow_on < 1) ||
1537 (new_config.rx_trigger > 1023) ||
1538 (new_config.tx_trigger > 1023) ||
1539 (new_config.flow_off > 1023) ||
1540 (new_config.flow_on > 1023) ||
1541 (new_config.pio_threshold < 0) ||
1542 (new_config.pio_threshold > 1024))
1543 return -EINVAL;
1544
1545 if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1546 new_config.dma_channel = 0;
1547
1548 if (info->stat_flags & ESP_STAT_NEVER_DMA)
1549 change_dma = new_config.dma_channel;
1550 else
1551 change_dma = (new_config.dma_channel != dma);
1552
1553 if (change_dma) {
1554 if (new_config.dma_channel) {
1555 /* PIO mode to DMA mode transition OR */
1556 /* change current DMA channel */
1557
1558 current_async = ports;
1559
1560 while (current_async) {
1561 if (current_async == info) {
1562 if (current_async->count > 1)
1563 return -EBUSY;
1564 } else if (current_async->count)
1565 return -EBUSY;
1566
1567 current_async =
1568 current_async->next_port;
1569 }
1570
1571 shutdown(info);
1572 dma = new_config.dma_channel;
1573 info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1574
1575 /* all ports must use the same DMA channel */
1576
1577 spin_lock_irqsave(&info->lock, flags);
1578 current_async = ports;
1579
1580 while (current_async) {
1581 esp_basic_init(current_async);
1582 current_async = current_async->next_port;
1583 }
1584 spin_unlock_irqrestore(&info->lock, flags);
1585 } else {
1586 /* DMA mode to PIO mode only */
1587
1588 if (info->count > 1)
1589 return -EBUSY;
1590
1591 shutdown(info);
1592 spin_lock_irqsave(&info->lock, flags);
1593 info->stat_flags |= ESP_STAT_NEVER_DMA;
1594 esp_basic_init(info);
1595 spin_unlock_irqrestore(&info->lock, flags);
1596 }
1597 }
1598
1599 info->config.pio_threshold = new_config.pio_threshold;
1600
1601 if ((new_config.flow_off != info->config.flow_off) ||
1602 (new_config.flow_on != info->config.flow_on)) {
1603 unsigned long flags;
1604
1605 info->config.flow_off = new_config.flow_off;
1606 info->config.flow_on = new_config.flow_on;
1607
1608 spin_lock_irqsave(&info->lock, flags);
1609 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1610 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1611 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1612 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1613 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1614 spin_unlock_irqrestore(&info->lock, flags);
1615 }
1616
1617 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1618 (new_config.tx_trigger != info->config.tx_trigger)) {
1619 unsigned long flags;
1620
1621 info->config.rx_trigger = new_config.rx_trigger;
1622 info->config.tx_trigger = new_config.tx_trigger;
1623 spin_lock_irqsave(&info->lock, flags);
1624 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1625 serial_out(info, UART_ESI_CMD2,
1626 new_config.rx_trigger >> 8);
1627 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1628 serial_out(info, UART_ESI_CMD2,
1629 new_config.tx_trigger >> 8);
1630 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1631 spin_unlock_irqrestore(&info->lock, flags);
1632 }
1633
1634 if (new_config.rx_timeout != info->config.rx_timeout) {
1635 unsigned long flags;
1636
1637 info->config.rx_timeout = new_config.rx_timeout;
1638 spin_lock_irqsave(&info->lock, flags);
1639
1640 if (info->IER & UART_IER_RDI) {
1641 serial_out(info, UART_ESI_CMD1,
1642 ESI_SET_RX_TIMEOUT);
1643 serial_out(info, UART_ESI_CMD2,
1644 new_config.rx_timeout);
1645 }
1646
1647 spin_unlock_irqrestore(&info->lock, flags);
1648 }
1649
1650 if (!(info->flags & ASYNC_INITIALIZED))
1651 retval = startup(info);
1652
1653 return retval;
1654}
1655
1656/*
1657 * get_lsr_info - get line status register info
1658 *
1659 * Purpose: Let user call ioctl() to get info when the UART physically
1660 * is emptied. On bus types like RS485, the transmitter must
1661 * release the bus after transmitting. This must be done when
1662 * the transmit shift register is empty, not be done when the
1663 * transmit holding register is empty. This functionality
1664 * allows an RS485 driver to be written in user space.
1665 */
1666static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1667{
1668 unsigned char status;
1669 unsigned int result;
1670 unsigned long flags;
1671
1672 spin_lock_irqsave(&info->lock, flags);
1673 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1674 status = serial_in(info, UART_ESI_STAT1);
1675 spin_unlock_irqrestore(&info->lock, flags);
1676 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1677 return put_user(result,value);
1678}
1679
1680
1681static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1682{
1683 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1684 unsigned char control, status;
1685 unsigned long flags;
1686
1687 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1688 return -ENODEV;
1689 if (tty->flags & (1 << TTY_IO_ERROR))
1690 return -EIO;
1691
1692 control = info->MCR;
1693
1694 spin_lock_irqsave(&info->lock, flags);
1695 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1696 status = serial_in(info, UART_ESI_STAT2);
1697 spin_unlock_irqrestore(&info->lock, flags);
1698
1699 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1700 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1701 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1702 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1703 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1704 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1705}
1706
1707static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1708 unsigned int set, unsigned int clear)
1709{
1710 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1711 unsigned long flags;
1712
1713 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1714 return -ENODEV;
1715 if (tty->flags & (1 << TTY_IO_ERROR))
1716 return -EIO;
1717
1718 spin_lock_irqsave(&info->lock, flags);
1719
1720 if (set & TIOCM_RTS)
1721 info->MCR |= UART_MCR_RTS;
1722 if (set & TIOCM_DTR)
1723 info->MCR |= UART_MCR_DTR;
1724
1725 if (clear & TIOCM_RTS)
1726 info->MCR &= ~UART_MCR_RTS;
1727 if (clear & TIOCM_DTR)
1728 info->MCR &= ~UART_MCR_DTR;
1729
1730 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1731 serial_out(info, UART_ESI_CMD2, UART_MCR);
1732 serial_out(info, UART_ESI_CMD2, info->MCR);
1733
1734 spin_unlock_irqrestore(&info->lock, flags);
1735 return 0;
1736}
1737
1738/*
1739 * rs_break() --- routine which turns the break handling on or off
1740 */
1741static void esp_break(struct tty_struct *tty, int break_state)
1742{
1743 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1744 unsigned long flags;
1745
1746 if (serial_paranoia_check(info, tty->name, "esp_break"))
1747 return;
1748
1749 if (break_state == -1) {
1750 spin_lock_irqsave(&info->lock, flags);
1751 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1752 serial_out(info, UART_ESI_CMD2, 0x01);
1753 spin_unlock_irqrestore(&info->lock, flags);
1754
1755 /* FIXME - new style wait needed here */
1756 interruptible_sleep_on(&info->break_wait);
1757 } else {
1758 spin_lock_irqsave(&info->lock, flags);
1759 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1760 serial_out(info, UART_ESI_CMD2, 0x00);
1761 spin_unlock_irqrestore(&info->lock, flags);
1762 }
1763}
1764
1765static int rs_ioctl(struct tty_struct *tty, struct file * file,
1766 unsigned int cmd, unsigned long arg)
1767{
1768 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1769 struct async_icount cprev, cnow; /* kernel counter temps */
1770 struct serial_icounter_struct __user *p_cuser; /* user space */
1771 void __user *argp = (void __user *)arg;
1772 unsigned long flags;
5a4bc8c1 1773 int ret;
1da177e4
LT		 1774
1775 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1776 return -ENODEV;
1777
1778 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1779 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1780 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1781 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1782 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1783 if (tty->flags & (1 << TTY_IO_ERROR))
1784 return -EIO;
1785 }
1786
1787 switch (cmd) {
1788 case TIOCGSERIAL:
1789 return get_serial_info(info, argp);
1790 case TIOCSSERIAL:
5a4bc8c1
AC		 1791 lock_kernel();
1792 ret = set_serial_info(info, argp);
1793 unlock_kernel();
1794 return ret;
1da177e4
LT		 1795 case TIOCSERCONFIG:
1796 /* do not reconfigure after initial configuration */
1797 return 0;
1798
1799 case TIOCSERGWILD:
1800 return put_user(0L, (unsigned long __user *)argp);
1801
1802 case TIOCSERGETLSR: /* Get line status register */
1803 return get_lsr_info(info, argp);
1804
1805 case TIOCSERSWILD:
1806 if (!capable(CAP_SYS_ADMIN))
1807 return -EPERM;
1808 return 0;
1809
1810 /*
1811 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1812 * - mask passed in arg for lines of interest
1813 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1814 * Caller should use TIOCGICOUNT to see which one it was
1815 */
1816 case TIOCMIWAIT:
1817 spin_lock_irqsave(&info->lock, flags);
1818 cprev = info->icount; /* note the counters on entry */
1819 spin_unlock_irqrestore(&info->lock, flags);
1820 while (1) {
1821 /* FIXME: convert to new style wakeup */
1822 interruptible_sleep_on(&info->delta_msr_wait);
1823 /* see if a signal did it */
1824 if (signal_pending(current))
1825 return -ERESTARTSYS;
1826 spin_lock_irqsave(&info->lock, flags);
1827 cnow = info->icount; /* atomic copy */
1828 spin_unlock_irqrestore(&info->lock, flags);
1829 if (cnow.rng == cprev.rng &&
1830 cnow.dsr == cprev.dsr &&
1831 cnow.dcd == cprev.dcd &&
1832 cnow.cts == cprev.cts)
1833 return -EIO; /* no change => error */
1834 if (((arg & TIOCM_RNG) &&
1835 (cnow.rng != cprev.rng)) ||
1836 ((arg & TIOCM_DSR) &&
1837 (cnow.dsr != cprev.dsr)) ||
1838 ((arg & TIOCM_CD) &&
1839 (cnow.dcd != cprev.dcd)) ||
1840 ((arg & TIOCM_CTS) &&
1841 (cnow.cts != cprev.cts)) ) {
1842 return 0;
1843 }
1844 cprev = cnow;
1845 }
1846 /* NOTREACHED */
1847
1848 /*
1849 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1850 * Return: write counters to the user passed counter struct
1851 * NB: both 1->0 and 0->1 transitions are counted except for
1852 * RI where only 0->1 is counted.
1853 */
1854 case TIOCGICOUNT:
1855 spin_lock_irqsave(&info->lock, flags);
1856 cnow = info->icount;
1857 spin_unlock_irqrestore(&info->lock, flags);
1858 p_cuser = argp;
1859 if (put_user(cnow.cts, &p_cuser->cts) ||
1860 put_user(cnow.dsr, &p_cuser->dsr) ||
1861 put_user(cnow.rng, &p_cuser->rng) ||
1862 put_user(cnow.dcd, &p_cuser->dcd))
1863 return -EFAULT;
1864
1865 return 0;
5a4bc8c1
AC		 1866 case TIOCGHAYESESP:
1867 return get_esp_config(info, argp);
1868 case TIOCSHAYESESP:
1869 lock_kernel();
1870 ret = set_esp_config(info, argp);
1871 unlock_kernel();
1872 return ret;
1da177e4
LT		 1873 default:
1874 return -ENOIOCTLCMD;
1875 }
1876 return 0;
1877}
1878
606d099c 1879static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1da177e4
LT		 1880{
1881 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1882 unsigned long flags;
1883
1da177e4
LT		 1884 change_speed(info);
1885
1886 spin_lock_irqsave(&info->lock, flags);
1887
1888 /* Handle transition to B0 status */
1889 if ((old_termios->c_cflag & CBAUD) &&
1890 !(tty->termios->c_cflag & CBAUD)) {
1891 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1892 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1893 serial_out(info, UART_ESI_CMD2, UART_MCR);
1894 serial_out(info, UART_ESI_CMD2, info->MCR);
1895 }
1896
1897 /* Handle transition away from B0 status */
1898 if (!(old_termios->c_cflag & CBAUD) &&
1899 (tty->termios->c_cflag & CBAUD)) {
1900 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1901 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1902 serial_out(info, UART_ESI_CMD2, UART_MCR);
1903 serial_out(info, UART_ESI_CMD2, info->MCR);
1904 }
1905
1906 spin_unlock_irqrestore(&info->lock, flags);
1907
1908 /* Handle turning of CRTSCTS */
1909 if ((old_termios->c_cflag & CRTSCTS) &&
1910 !(tty->termios->c_cflag & CRTSCTS)) {
1911 rs_start(tty);
1912 }
1913}
1914
1915/*
1916 * ------------------------------------------------------------
1917 * rs_close()
1918 *
1919 * This routine is called when the serial port gets closed. First, we
1920 * wait for the last remaining data to be sent. Then, we unlink its
1921 * async structure from the interrupt chain if necessary, and we free
1922 * that IRQ if nothing is left in the chain.
1923 * ------------------------------------------------------------
1924 */
1925static void rs_close(struct tty_struct *tty, struct file * filp)
1926{
1927 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1928 unsigned long flags;
1929
1930 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1931 return;
1932
1933 spin_lock_irqsave(&info->lock, flags);
1934
1935 if (tty_hung_up_p(filp)) {
1936 DBG_CNT("before DEC-hung");
1937 goto out;
1938 }
1939
1940#ifdef SERIAL_DEBUG_OPEN
1941 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1942#endif
1943 if ((tty->count == 1) && (info->count != 1)) {
1944 /*
1945 * Uh, oh. tty->count is 1, which means that the tty
1946 * structure will be freed. Info->count should always
1947 * be one in these conditions. If it's greater than
1948 * one, we've got real problems, since it means the
1949 * serial port won't be shutdown.
1950 */
1951 printk("rs_close: bad serial port count; tty->count is 1, "
1952 "info->count is %d\n", info->count);
1953 info->count = 1;
1954 }
1955 if (--info->count < 0) {
1956 printk("rs_close: bad serial port count for ttys%d: %d\n",
1957 info->line, info->count);
1958 info->count = 0;
1959 }
1960 if (info->count) {
1961 DBG_CNT("before DEC-2");
1962 goto out;
1963 }
1964 info->flags |= ASYNC_CLOSING;
1965
1966 spin_unlock_irqrestore(&info->lock, flags);
1967 /*
1968 * Now we wait for the transmit buffer to clear; and we notify
1969 * the line discipline to only process XON/XOFF characters.
1970 */
1971 tty->closing = 1;
1972 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1973 tty_wait_until_sent(tty, info->closing_wait);
1974 /*
1975 * At this point we stop accepting input. To do this, we
1976 * disable the receive line status interrupts, and tell the
1977 * interrupt driver to stop checking the data ready bit in the
1978 * line status register.
1979 */
1980 /* info->IER &= ~UART_IER_RLSI; */
1981 info->IER &= ~UART_IER_RDI;
1982 info->read_status_mask &= ~UART_LSR_DR;
1983 if (info->flags & ASYNC_INITIALIZED) {
1984
1985 spin_lock_irqsave(&info->lock, flags);
1986 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1987 serial_out(info, UART_ESI_CMD2, info->IER);
1988
1989 /* disable receive timeout */
1990 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1991 serial_out(info, UART_ESI_CMD2, 0x00);
1992
1993 spin_unlock_irqrestore(&info->lock, flags);
1994
1995 /*
1996 * Before we drop DTR, make sure the UART transmitter
1997 * has completely drained; this is especially
1998 * important if there is a transmit FIFO!
1999 */
2000 rs_wait_until_sent(tty, info->timeout);
2001 }
2002 shutdown(info);
2003 if (tty->driver->flush_buffer)
2004 tty->driver->flush_buffer(tty);
2005 tty_ldisc_flush(tty);
2006 tty->closing = 0;
1da177e4
LT		 2007 info->tty = NULL;
2008
2009 if (info->blocked_open) {
2010 if (info->close_delay) {
2011 msleep_interruptible(jiffies_to_msecs(info->close_delay));
2012 }
2013 wake_up_interruptible(&info->open_wait);
2014 }
2015 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2016 wake_up_interruptible(&info->close_wait);
2017 return;
2018
2019out:
2020 spin_unlock_irqrestore(&info->lock, flags);
2021}
2022
2023static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2024{
2025 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2026 unsigned long orig_jiffies, char_time;
2027 unsigned long flags;
2028
2029 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2030 return;
2031
2032 orig_jiffies = jiffies;
2033 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2034
2035 if (!char_time)
2036 char_time = 1;
2037
2038 spin_lock_irqsave(&info->lock, flags);
2039 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2040 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2041
2042 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2043 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2044
2045 spin_unlock_irqrestore(&info->lock, flags);
2046 msleep_interruptible(jiffies_to_msecs(char_time));
2047
2048 if (signal_pending(current))
2049 break;
2050
2051 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2052 break;
2053
2054 spin_lock_irqsave(&info->lock, flags);
2055 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2056 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2057 }
2058 spin_unlock_irqrestore(&info->lock, flags);
2059 set_current_state(TASK_RUNNING);
2060}
2061
2062/*
2063 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2064 */
2065static void esp_hangup(struct tty_struct *tty)
2066{
2067 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2068
2069 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2070 return;
2071
2072 rs_flush_buffer(tty);
2073 shutdown(info);
1da177e4
LT		 2074 info->count = 0;
2075 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2076 info->tty = NULL;
2077 wake_up_interruptible(&info->open_wait);
2078}
2079
2080/*
2081 * ------------------------------------------------------------
2082 * esp_open() and friends
2083 * ------------------------------------------------------------
2084 */
2085static int block_til_ready(struct tty_struct *tty, struct file * filp,
2086 struct esp_struct *info)
2087{
2088 DECLARE_WAITQUEUE(wait, current);
2089 int retval;
2090 int do_clocal = 0;
2091 unsigned long flags;
2092
2093 /*
2094 * If the device is in the middle of being closed, then block
2095 * until it's done, and then try again.
2096 */
2097 if (tty_hung_up_p(filp) ||
2098 (info->flags & ASYNC_CLOSING)) {
2099 if (info->flags & ASYNC_CLOSING)
2100 interruptible_sleep_on(&info->close_wait);
2101#ifdef SERIAL_DO_RESTART
2102 if (info->flags & ASYNC_HUP_NOTIFY)
2103 return -EAGAIN;
2104 else
2105 return -ERESTARTSYS;
2106#else
2107 return -EAGAIN;
2108#endif
2109 }
2110
2111 /*
2112 * If non-blocking mode is set, or the port is not enabled,
2113 * then make the check up front and then exit.
2114 */
2115 if ((filp->f_flags & O_NONBLOCK) ||
2116 (tty->flags & (1 << TTY_IO_ERROR))) {
2117 info->flags |= ASYNC_NORMAL_ACTIVE;
2118 return 0;
2119 }
2120
2121 if (tty->termios->c_cflag & CLOCAL)
2122 do_clocal = 1;
2123
2124 /*
2125 * Block waiting for the carrier detect and the line to become
2126 * free (i.e., not in use by the callout). While we are in
2127 * this loop, info->count is dropped by one, so that
2128 * rs_close() knows when to free things. We restore it upon
2129 * exit, either normal or abnormal.
2130 */
2131 retval = 0;
2132 add_wait_queue(&info->open_wait, &wait);
2133#ifdef SERIAL_DEBUG_OPEN
2134 printk("block_til_ready before block: ttys%d, count = %d\n",
2135 info->line, info->count);
2136#endif
2137 spin_lock_irqsave(&info->lock, flags);
2138 if (!tty_hung_up_p(filp))
2139 info->count--;
2140 info->blocked_open++;
2141 while (1) {
2142 if ((tty->termios->c_cflag & CBAUD)) {
2143 unsigned int scratch;
2144
2145 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2146 serial_out(info, UART_ESI_CMD2, UART_MCR);
2147 scratch = serial_in(info, UART_ESI_STAT1);
2148 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2149 serial_out(info, UART_ESI_CMD2, UART_MCR);
2150 serial_out(info, UART_ESI_CMD2,
2151 scratch | UART_MCR_DTR | UART_MCR_RTS);
2152 }
2153 set_current_state(TASK_INTERRUPTIBLE);
2154 if (tty_hung_up_p(filp) ||
2155 !(info->flags & ASYNC_INITIALIZED)) {
2156#ifdef SERIAL_DO_RESTART
2157 if (info->flags & ASYNC_HUP_NOTIFY)
2158 retval = -EAGAIN;
2159 else
2160 retval = -ERESTARTSYS;
2161#else
2162 retval = -EAGAIN;
2163#endif
2164 break;
2165 }
2166
2167 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2168 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2169 do_clocal = 1;
2170
2171 if (!(info->flags & ASYNC_CLOSING) &&
2172 (do_clocal))
2173 break;
2174 if (signal_pending(current)) {
2175 retval = -ERESTARTSYS;
2176 break;
2177 }
2178#ifdef SERIAL_DEBUG_OPEN
2179 printk("block_til_ready blocking: ttys%d, count = %d\n",
2180 info->line, info->count);
2181#endif
2182 spin_unlock_irqrestore(&info->lock, flags);
2183 schedule();
2184 spin_lock_irqsave(&info->lock, flags);
2185 }
2186 set_current_state(TASK_RUNNING);
2187 remove_wait_queue(&info->open_wait, &wait);
2188 if (!tty_hung_up_p(filp))
2189 info->count++;
2190 info->blocked_open--;
2191 spin_unlock_irqrestore(&info->lock, flags);
2192#ifdef SERIAL_DEBUG_OPEN
2193 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2194 info->line, info->count);
2195#endif
2196 if (retval)
2197 return retval;
2198 info->flags |= ASYNC_NORMAL_ACTIVE;
2199 return 0;
2200}
2201
2202/*
2203 * This routine is called whenever a serial port is opened. It
2204 * enables interrupts for a serial port, linking in its async structure into
2205 * the IRQ chain. It also performs the serial-specific
2206 * initialization for the tty structure.
2207 */
2208static int esp_open(struct tty_struct *tty, struct file * filp)
2209{
2210 struct esp_struct *info;
2211 int retval, line;
2212 unsigned long flags;
2213
2214 line = tty->index;
2215 if ((line < 0) || (line >= NR_PORTS))
2216 return -ENODEV;
2217
2218 /* find the port in the chain */
2219
2220 info = ports;
2221
2222 while (info && (info->line != line))
2223 info = info->next_port;
2224
2225 if (!info) {
2226 serial_paranoia_check(info, tty->name, "esp_open");
2227 return -ENODEV;
2228 }
2229
2230#ifdef SERIAL_DEBUG_OPEN
2231 printk("esp_open %s, count = %d\n", tty->name, info->count);
2232#endif
2233 spin_lock_irqsave(&info->lock, flags);
2234 info->count++;
2235 tty->driver_data = info;
2236 info->tty = tty;
2237
5552c28f 2238 spin_unlock_irqrestore(&info->lock, flags);
1da177e4
LT		 2239
2240 /*
2241 * Start up serial port
2242 */
2243 retval = startup(info);
2244 if (retval)
2245 return retval;
2246
2247 retval = block_til_ready(tty, filp, info);
2248 if (retval) {
2249#ifdef SERIAL_DEBUG_OPEN
2250 printk("esp_open returning after block_til_ready with %d\n",
2251 retval);
2252#endif
2253 return retval;
2254 }
2255
2256#ifdef SERIAL_DEBUG_OPEN
2257 printk("esp_open %s successful...", tty->name);
2258#endif
2259 return 0;
2260}
2261
2262/*
2263 * ---------------------------------------------------------------------
2264 * espserial_init() and friends
2265 *
2266 * espserial_init() is called at boot-time to initialize the serial driver.
2267 * ---------------------------------------------------------------------
2268 */
2269
2270/*
2271 * This routine prints out the appropriate serial driver version
2272 * number, and identifies which options were configured into this
2273 * driver.
2274 */
2275
2276static inline void show_serial_version(void)
2277{
2278 printk(KERN_INFO "%s version %s (DMA %u)\n",
2279 serial_name, serial_version, dma);
2280}
2281
2282/*
2283 * This routine is called by espserial_init() to initialize a specific serial
2284 * port.
2285 */
2286static inline int autoconfig(struct esp_struct * info)
2287{
2288 int port_detected = 0;
2289 unsigned long flags;
2290
2291 if (!request_region(info->port, REGION_SIZE, "esp serial"))
2292 return -EIO;
2293
2294 spin_lock_irqsave(&info->lock, flags);
2295 /*
2296 * Check for ESP card
2297 */
2298
2299 if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2300 serial_out(info, UART_ESI_CMD1, 0x00);
2301 serial_out(info, UART_ESI_CMD1, 0x01);
2302
2303 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2304 port_detected = 1;
2305
2306 if (!(info->irq)) {
2307 serial_out(info, UART_ESI_CMD1, 0x02);
2308
2309 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2310 info->irq = 3;
2311 else
2312 info->irq = 4;
2313 }
2314
2315
2316 /* put card in enhanced mode */
2317 /* this prevents access through */
2318 /* the "old" IO ports */
2319 esp_basic_init(info);
2320
2321 /* clear out MCR */
2322 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2323 serial_out(info, UART_ESI_CMD2, UART_MCR);
2324 serial_out(info, UART_ESI_CMD2, 0x00);
2325 }
2326 }
2327 if (!port_detected)
2328 release_region(info->port, REGION_SIZE);
2329
2330 spin_unlock_irqrestore(&info->lock, flags);
2331 return (port_detected);
2332}
2333
b68e31d0 2334static const struct tty_operations esp_ops = {
1da177e4
LT		 2335 .open = esp_open,
2336 .close = rs_close,
2337 .write = rs_write,
2338 .put_char = rs_put_char,
2339 .flush_chars = rs_flush_chars,
2340 .write_room = rs_write_room,
2341 .chars_in_buffer = rs_chars_in_buffer,
2342 .flush_buffer = rs_flush_buffer,
2343 .ioctl = rs_ioctl,
2344 .throttle = rs_throttle,
2345 .unthrottle = rs_unthrottle,
2346 .set_termios = rs_set_termios,
2347 .stop = rs_stop,
2348 .start = rs_start,
2349 .hangup = esp_hangup,
2350 .break_ctl = esp_break,
2351 .wait_until_sent = rs_wait_until_sent,
2352 .tiocmget = esp_tiocmget,
2353 .tiocmset = esp_tiocmset,
2354};
2355
2356/*
2357 * The serial driver boot-time initialization code!
2358 */
2359static int __init espserial_init(void)
2360{
2361 int i, offset;
2362 struct esp_struct * info;
2363 struct esp_struct *last_primary = NULL;
2364 int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2365
2366 esp_driver = alloc_tty_driver(NR_PORTS);
2367 if (!esp_driver)
2368 return -ENOMEM;
2369
2370 for (i = 0; i < NR_PRIMARY; i++) {
2371 if (irq[i] != 0) {
2372 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2373 (irq[i] == 8) || (irq[i] == 13))
2374 irq[i] = 0;
2375 else if (irq[i] == 2)
2376 irq[i] = 9;
2377 }
2378 }
2379
2380 if ((dma != 1) && (dma != 3))
2381 dma = 0;
2382
2383 if ((rx_trigger < 1) || (rx_trigger > 1023))
2384 rx_trigger = 768;
2385
2386 if ((tx_trigger < 1) || (tx_trigger > 1023))
2387 tx_trigger = 768;
2388
2389 if ((flow_off < 1) || (flow_off > 1023))
2390 flow_off = 1016;
2391
2392 if ((flow_on < 1) || (flow_on > 1023))
2393 flow_on = 944;
2394
2395 if ((rx_timeout < 0) || (rx_timeout > 255))
2396 rx_timeout = 128;
2397
2398 if (flow_on >= flow_off)
2399 flow_on = flow_off - 1;
2400
2401 show_serial_version();
2402
2403 /* Initialize the tty_driver structure */
2404
2405 esp_driver->owner = THIS_MODULE;
2406 esp_driver->name = "ttyP";
1da177e4
LT		 2407 esp_driver->major = ESP_IN_MAJOR;
2408 esp_driver->minor_start = 0;
2409 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2410 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2411 esp_driver->init_termios = tty_std_termios;
2412 esp_driver->init_termios.c_cflag =
2413 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2414 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2415 tty_set_operations(esp_driver, &esp_ops);
2416 if (tty_register_driver(esp_driver))
2417 {
2418 printk(KERN_ERR "Couldn't register esp serial driver");
2419 put_tty_driver(esp_driver);
2420 return 1;
2421 }
2422
dd00cc48 2423 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
1da177e4
LT		 2424
2425 if (!info)
2426 {
2427 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2428 tty_unregister_driver(esp_driver);
2429 put_tty_driver(esp_driver);
2430 return 1;
2431 }
2432
8f56a31a 2433 spin_lock_init(&info->lock);
1da177e4
LT		 2434 /* rx_trigger, tx_trigger are needed by autoconfig */
2435 info->config.rx_trigger = rx_trigger;
2436 info->config.tx_trigger = tx_trigger;
2437
2438 i = 0;
2439 offset = 0;
2440
2441 do {
2442 info->port = esp[i] + offset;
2443 info->irq = irq[i];
2444 info->line = (i * 8) + (offset / 8);
2445
2446 if (!autoconfig(info)) {
2447 i++;
2448 offset = 0;
2449 continue;
2450 }
2451
2452 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2453 info->flags = STD_COM_FLAGS;
2454 if (info->custom_divisor)
2455 info->flags |= ASYNC_SPD_CUST;
2456 info->magic = ESP_MAGIC;
2457 info->close_delay = 5*HZ/10;
2458 info->closing_wait = 30*HZ;
1da177e4
LT		 2459 info->config.rx_timeout = rx_timeout;
2460 info->config.flow_on = flow_on;
2461 info->config.flow_off = flow_off;
2462 info->config.pio_threshold = pio_threshold;
2463 info->next_port = ports;
2464 init_waitqueue_head(&info->open_wait);
2465 init_waitqueue_head(&info->close_wait);
2466 init_waitqueue_head(&info->delta_msr_wait);
2467 init_waitqueue_head(&info->break_wait);
1da177e4
LT		 2468 ports = info;
2469 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2470 info->line, info->port, info->irq);
2471
2472 if (info->line % 8) {
2473 printk("secondary port\n");
2474 /* 8 port cards can't do DMA */
2475 info->stat_flags |= ESP_STAT_NEVER_DMA;
2476
2477 if (last_primary)
2478 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2479 } else {
2480 printk("primary port\n");
2481 last_primary = info;
2482 irq[i] = info->irq;
2483 }
2484
2485 if (!dma)
2486 info->stat_flags |= ESP_STAT_NEVER_DMA;
2487
dd00cc48 2488 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
1da177e4
LT		 2489 if (!info)
2490 {
2491 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2492
2493 /* allow use of the already detected ports */
2494 return 0;
2495 }
2496
80d38f9a 2497 spin_lock_init(&info->lock);
1da177e4
LT		 2498 /* rx_trigger, tx_trigger are needed by autoconfig */
2499 info->config.rx_trigger = rx_trigger;
2500 info->config.tx_trigger = tx_trigger;
2501
2502 if (offset == 56) {
2503 i++;
2504 offset = 0;
2505 } else {
2506 offset += 8;
2507 }
2508 } while (i < NR_PRIMARY);
2509
2510 /* free the last port memory allocation */
2511 kfree(info);
2512
2513 return 0;
2514}
2515
2516static void __exit espserial_exit(void)
2517{
2518 int e1;
2519 struct esp_struct *temp_async;
2520 struct esp_pio_buffer *pio_buf;
2521
2522 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2523 if ((e1 = tty_unregister_driver(esp_driver)))
2524 printk("SERIAL: failed to unregister serial driver (%d)\n",
2525 e1);
2526 put_tty_driver(esp_driver);
2527
2528 while (ports) {
2529 if (ports->port) {
2530 release_region(ports->port, REGION_SIZE);
2531 }
2532 temp_async = ports->next_port;
2533 kfree(ports);
2534 ports = temp_async;
2535 }
2536
2537 if (dma_buffer)
2538 free_pages((unsigned long)dma_buffer,
2539 get_order(DMA_BUFFER_SZ));
2540
1da177e4
LT		 2541 while (free_pio_buf) {
2542 pio_buf = free_pio_buf->next;
2543 kfree(free_pio_buf);
2544 free_pio_buf = pio_buf;
2545 }
2546}
2547
2548module_init(espserial_init);
2549module_exit(espserial_exit);
Linux kernel - Deliverables
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