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tty/serial: lay the foundations for the next set of reworks
[linux-2.6-block.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)) {
1da177e4
LT		 1603 info->config.flow_off = new_config.flow_off;
1604 info->config.flow_on = new_config.flow_on;
1605
1606 spin_lock_irqsave(&info->lock, flags);
1607 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1608 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1609 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1610 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1611 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1612 spin_unlock_irqrestore(&info->lock, flags);
1613 }
1614
1615 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1616 (new_config.tx_trigger != info->config.tx_trigger)) {
1da177e4
LT		 1617 info->config.rx_trigger = new_config.rx_trigger;
1618 info->config.tx_trigger = new_config.tx_trigger;
1619 spin_lock_irqsave(&info->lock, flags);
1620 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1621 serial_out(info, UART_ESI_CMD2,
1622 new_config.rx_trigger >> 8);
1623 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1624 serial_out(info, UART_ESI_CMD2,
1625 new_config.tx_trigger >> 8);
1626 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1627 spin_unlock_irqrestore(&info->lock, flags);
1628 }
1629
1630 if (new_config.rx_timeout != info->config.rx_timeout) {
1da177e4
LT		 1631 info->config.rx_timeout = new_config.rx_timeout;
1632 spin_lock_irqsave(&info->lock, flags);
1633
1634 if (info->IER & UART_IER_RDI) {
1635 serial_out(info, UART_ESI_CMD1,
1636 ESI_SET_RX_TIMEOUT);
1637 serial_out(info, UART_ESI_CMD2,
1638 new_config.rx_timeout);
1639 }
1640
1641 spin_unlock_irqrestore(&info->lock, flags);
1642 }
1643
1644 if (!(info->flags & ASYNC_INITIALIZED))
1645 retval = startup(info);
1646
1647 return retval;
1648}
1649
1650/*
1651 * get_lsr_info - get line status register info
1652 *
1653 * Purpose: Let user call ioctl() to get info when the UART physically
1654 * is emptied. On bus types like RS485, the transmitter must
1655 * release the bus after transmitting. This must be done when
1656 * the transmit shift register is empty, not be done when the
1657 * transmit holding register is empty. This functionality
1658 * allows an RS485 driver to be written in user space.
1659 */
1660static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1661{
1662 unsigned char status;
1663 unsigned int result;
1664 unsigned long flags;
1665
1666 spin_lock_irqsave(&info->lock, flags);
1667 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1668 status = serial_in(info, UART_ESI_STAT1);
1669 spin_unlock_irqrestore(&info->lock, flags);
1670 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1671 return put_user(result,value);
1672}
1673
1674
1675static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1676{
1677 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1678 unsigned char control, status;
1679 unsigned long flags;
1680
1681 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1682 return -ENODEV;
1683 if (tty->flags & (1 << TTY_IO_ERROR))
1684 return -EIO;
1685
1686 control = info->MCR;
1687
1688 spin_lock_irqsave(&info->lock, flags);
1689 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1690 status = serial_in(info, UART_ESI_STAT2);
1691 spin_unlock_irqrestore(&info->lock, flags);
1692
1693 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1694 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1695 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1696 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1697 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1698 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1699}
1700
1701static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1702 unsigned int set, unsigned int clear)
1703{
1704 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1705 unsigned long flags;
1706
1707 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1708 return -ENODEV;
1709 if (tty->flags & (1 << TTY_IO_ERROR))
1710 return -EIO;
1711
1712 spin_lock_irqsave(&info->lock, flags);
1713
1714 if (set & TIOCM_RTS)
1715 info->MCR |= UART_MCR_RTS;
1716 if (set & TIOCM_DTR)
1717 info->MCR |= UART_MCR_DTR;
1718
1719 if (clear & TIOCM_RTS)
1720 info->MCR &= ~UART_MCR_RTS;
1721 if (clear & TIOCM_DTR)
1722 info->MCR &= ~UART_MCR_DTR;
1723
1724 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1725 serial_out(info, UART_ESI_CMD2, UART_MCR);
1726 serial_out(info, UART_ESI_CMD2, info->MCR);
1727
1728 spin_unlock_irqrestore(&info->lock, flags);
1729 return 0;
1730}
1731
1732/*
1733 * rs_break() --- routine which turns the break handling on or off
1734 */
1735static void esp_break(struct tty_struct *tty, int break_state)
1736{
1737 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1738 unsigned long flags;
1739
1740 if (serial_paranoia_check(info, tty->name, "esp_break"))
1741 return;
1742
1743 if (break_state == -1) {
1744 spin_lock_irqsave(&info->lock, flags);
1745 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1746 serial_out(info, UART_ESI_CMD2, 0x01);
1747 spin_unlock_irqrestore(&info->lock, flags);
1748
1749 /* FIXME - new style wait needed here */
1750 interruptible_sleep_on(&info->break_wait);
1751 } else {
1752 spin_lock_irqsave(&info->lock, flags);
1753 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1754 serial_out(info, UART_ESI_CMD2, 0x00);
1755 spin_unlock_irqrestore(&info->lock, flags);
1756 }
1757}
1758
1759static int rs_ioctl(struct tty_struct *tty, struct file * file,
1760 unsigned int cmd, unsigned long arg)
1761{
1762 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1763 struct async_icount cprev, cnow; /* kernel counter temps */
1764 struct serial_icounter_struct __user *p_cuser; /* user space */
1765 void __user *argp = (void __user *)arg;
1766 unsigned long flags;
5a4bc8c1 1767 int ret;
1da177e4
LT		 1768
1769 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1770 return -ENODEV;
1771
1772 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1773 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1774 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1775 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1776 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1777 if (tty->flags & (1 << TTY_IO_ERROR))
1778 return -EIO;
1779 }
1780
1781 switch (cmd) {
1782 case TIOCGSERIAL:
1783 return get_serial_info(info, argp);
1784 case TIOCSSERIAL:
5a4bc8c1
AC		 1785 lock_kernel();
1786 ret = set_serial_info(info, argp);
1787 unlock_kernel();
1788 return ret;
1da177e4
LT		 1789 case TIOCSERCONFIG:
1790 /* do not reconfigure after initial configuration */
1791 return 0;
1792
1793 case TIOCSERGWILD:
1794 return put_user(0L, (unsigned long __user *)argp);
1795
1796 case TIOCSERGETLSR: /* Get line status register */
1797 return get_lsr_info(info, argp);
1798
1799 case TIOCSERSWILD:
1800 if (!capable(CAP_SYS_ADMIN))
1801 return -EPERM;
1802 return 0;
1803
1804 /*
1805 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1806 * - mask passed in arg for lines of interest
1807 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1808 * Caller should use TIOCGICOUNT to see which one it was
1809 */
1810 case TIOCMIWAIT:
1811 spin_lock_irqsave(&info->lock, flags);
1812 cprev = info->icount; /* note the counters on entry */
1813 spin_unlock_irqrestore(&info->lock, flags);
1814 while (1) {
1815 /* FIXME: convert to new style wakeup */
1816 interruptible_sleep_on(&info->delta_msr_wait);
1817 /* see if a signal did it */
1818 if (signal_pending(current))
1819 return -ERESTARTSYS;
1820 spin_lock_irqsave(&info->lock, flags);
1821 cnow = info->icount; /* atomic copy */
1822 spin_unlock_irqrestore(&info->lock, flags);
1823 if (cnow.rng == cprev.rng &&
1824 cnow.dsr == cprev.dsr &&
1825 cnow.dcd == cprev.dcd &&
1826 cnow.cts == cprev.cts)
1827 return -EIO; /* no change => error */
1828 if (((arg & TIOCM_RNG) &&
1829 (cnow.rng != cprev.rng)) ||
1830 ((arg & TIOCM_DSR) &&
1831 (cnow.dsr != cprev.dsr)) ||
1832 ((arg & TIOCM_CD) &&
1833 (cnow.dcd != cprev.dcd)) ||
1834 ((arg & TIOCM_CTS) &&
1835 (cnow.cts != cprev.cts)) ) {
1836 return 0;
1837 }
1838 cprev = cnow;
1839 }
1840 /* NOTREACHED */
1841
1842 /*
1843 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1844 * Return: write counters to the user passed counter struct
1845 * NB: both 1->0 and 0->1 transitions are counted except for
1846 * RI where only 0->1 is counted.
1847 */
1848 case TIOCGICOUNT:
1849 spin_lock_irqsave(&info->lock, flags);
1850 cnow = info->icount;
1851 spin_unlock_irqrestore(&info->lock, flags);
1852 p_cuser = argp;
1853 if (put_user(cnow.cts, &p_cuser->cts) ||
1854 put_user(cnow.dsr, &p_cuser->dsr) ||
1855 put_user(cnow.rng, &p_cuser->rng) ||
1856 put_user(cnow.dcd, &p_cuser->dcd))
1857 return -EFAULT;
1858
1859 return 0;
5a4bc8c1
AC		 1860 case TIOCGHAYESESP:
1861 return get_esp_config(info, argp);
1862 case TIOCSHAYESESP:
1863 lock_kernel();
1864 ret = set_esp_config(info, argp);
1865 unlock_kernel();
1866 return ret;
1da177e4
LT		 1867 default:
1868 return -ENOIOCTLCMD;
1869 }
1870 return 0;
1871}
1872
606d099c 1873static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1da177e4
LT		 1874{
1875 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1876 unsigned long flags;
1877
1da177e4
LT		 1878 change_speed(info);
1879
1880 spin_lock_irqsave(&info->lock, flags);
1881
1882 /* Handle transition to B0 status */
1883 if ((old_termios->c_cflag & CBAUD) &&
1884 !(tty->termios->c_cflag & CBAUD)) {
1885 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1886 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1887 serial_out(info, UART_ESI_CMD2, UART_MCR);
1888 serial_out(info, UART_ESI_CMD2, info->MCR);
1889 }
1890
1891 /* Handle transition away from B0 status */
1892 if (!(old_termios->c_cflag & CBAUD) &&
1893 (tty->termios->c_cflag & CBAUD)) {
1894 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1895 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1896 serial_out(info, UART_ESI_CMD2, UART_MCR);
1897 serial_out(info, UART_ESI_CMD2, info->MCR);
1898 }
1899
1900 spin_unlock_irqrestore(&info->lock, flags);
1901
1902 /* Handle turning of CRTSCTS */
1903 if ((old_termios->c_cflag & CRTSCTS) &&
1904 !(tty->termios->c_cflag & CRTSCTS)) {
1905 rs_start(tty);
1906 }
1907}
1908
1909/*
1910 * ------------------------------------------------------------
1911 * rs_close()
1912 *
1913 * This routine is called when the serial port gets closed. First, we
1914 * wait for the last remaining data to be sent. Then, we unlink its
1915 * async structure from the interrupt chain if necessary, and we free
1916 * that IRQ if nothing is left in the chain.
1917 * ------------------------------------------------------------
1918 */
1919static void rs_close(struct tty_struct *tty, struct file * filp)
1920{
1921 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1922 unsigned long flags;
1923
1924 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1925 return;
1926
1927 spin_lock_irqsave(&info->lock, flags);
1928
1929 if (tty_hung_up_p(filp)) {
1930 DBG_CNT("before DEC-hung");
1931 goto out;
1932 }
1933
1934#ifdef SERIAL_DEBUG_OPEN
1935 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1936#endif
1937 if ((tty->count == 1) && (info->count != 1)) {
1938 /*
1939 * Uh, oh. tty->count is 1, which means that the tty
1940 * structure will be freed. Info->count should always
1941 * be one in these conditions. If it's greater than
1942 * one, we've got real problems, since it means the
1943 * serial port won't be shutdown.
1944 */
1945 printk("rs_close: bad serial port count; tty->count is 1, "
1946 "info->count is %d\n", info->count);
1947 info->count = 1;
1948 }
1949 if (--info->count < 0) {
1950 printk("rs_close: bad serial port count for ttys%d: %d\n",
1951 info->line, info->count);
1952 info->count = 0;
1953 }
1954 if (info->count) {
1955 DBG_CNT("before DEC-2");
1956 goto out;
1957 }
1958 info->flags |= ASYNC_CLOSING;
1959
1960 spin_unlock_irqrestore(&info->lock, flags);
1961 /*
1962 * Now we wait for the transmit buffer to clear; and we notify
1963 * the line discipline to only process XON/XOFF characters.
1964 */
1965 tty->closing = 1;
1966 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1967 tty_wait_until_sent(tty, info->closing_wait);
1968 /*
1969 * At this point we stop accepting input. To do this, we
1970 * disable the receive line status interrupts, and tell the
1971 * interrupt driver to stop checking the data ready bit in the
1972 * line status register.
1973 */
1974 /* info->IER &= ~UART_IER_RLSI; */
1975 info->IER &= ~UART_IER_RDI;
1976 info->read_status_mask &= ~UART_LSR_DR;
1977 if (info->flags & ASYNC_INITIALIZED) {
1978
1979 spin_lock_irqsave(&info->lock, flags);
1980 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1981 serial_out(info, UART_ESI_CMD2, info->IER);
1982
1983 /* disable receive timeout */
1984 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1985 serial_out(info, UART_ESI_CMD2, 0x00);
1986
1987 spin_unlock_irqrestore(&info->lock, flags);
1988
1989 /*
1990 * Before we drop DTR, make sure the UART transmitter
1991 * has completely drained; this is especially
1992 * important if there is a transmit FIFO!
1993 */
1994 rs_wait_until_sent(tty, info->timeout);
1995 }
1996 shutdown(info);
978e595f 1997 rs_flush_buffer(tty);
1da177e4
LT		 1998 tty_ldisc_flush(tty);
1999 tty->closing = 0;
1da177e4
LT		 2000 info->tty = NULL;
2001
2002 if (info->blocked_open) {
2003 if (info->close_delay) {
2004 msleep_interruptible(jiffies_to_msecs(info->close_delay));
2005 }
2006 wake_up_interruptible(&info->open_wait);
2007 }
2008 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2009 wake_up_interruptible(&info->close_wait);
2010 return;
2011
2012out:
2013 spin_unlock_irqrestore(&info->lock, flags);
2014}
2015
2016static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2017{
2018 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2019 unsigned long orig_jiffies, char_time;
2020 unsigned long flags;
2021
2022 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2023 return;
2024
2025 orig_jiffies = jiffies;
2026 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2027
2028 if (!char_time)
2029 char_time = 1;
2030
2031 spin_lock_irqsave(&info->lock, flags);
2032 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2033 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2034
2035 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2036 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2037
2038 spin_unlock_irqrestore(&info->lock, flags);
2039 msleep_interruptible(jiffies_to_msecs(char_time));
2040
2041 if (signal_pending(current))
d3ceb656 2042 return;
1da177e4
LT		 2043
2044 if (timeout && time_after(jiffies, orig_jiffies + timeout))
d3ceb656 2045 return;
1da177e4
LT		 2046
2047 spin_lock_irqsave(&info->lock, flags);
2048 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2049 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2050 }
2051 spin_unlock_irqrestore(&info->lock, flags);
2052 set_current_state(TASK_RUNNING);
2053}
2054
2055/*
2056 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2057 */
2058static void esp_hangup(struct tty_struct *tty)
2059{
2060 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2061
2062 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2063 return;
2064
2065 rs_flush_buffer(tty);
2066 shutdown(info);
1da177e4
LT		 2067 info->count = 0;
2068 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2069 info->tty = NULL;
2070 wake_up_interruptible(&info->open_wait);
2071}
2072
2073/*
2074 * ------------------------------------------------------------
2075 * esp_open() and friends
2076 * ------------------------------------------------------------
2077 */
2078static int block_til_ready(struct tty_struct *tty, struct file * filp,
2079 struct esp_struct *info)
2080{
2081 DECLARE_WAITQUEUE(wait, current);
2082 int retval;
2083 int do_clocal = 0;
2084 unsigned long flags;
2085
2086 /*
2087 * If the device is in the middle of being closed, then block
2088 * until it's done, and then try again.
2089 */
2090 if (tty_hung_up_p(filp) ||
2091 (info->flags & ASYNC_CLOSING)) {
2092 if (info->flags & ASYNC_CLOSING)
2093 interruptible_sleep_on(&info->close_wait);
2094#ifdef SERIAL_DO_RESTART
2095 if (info->flags & ASYNC_HUP_NOTIFY)
2096 return -EAGAIN;
2097 else
2098 return -ERESTARTSYS;
2099#else
2100 return -EAGAIN;
2101#endif
2102 }
2103
2104 /*
2105 * If non-blocking mode is set, or the port is not enabled,
2106 * then make the check up front and then exit.
2107 */
2108 if ((filp->f_flags & O_NONBLOCK) ||
2109 (tty->flags & (1 << TTY_IO_ERROR))) {
2110 info->flags |= ASYNC_NORMAL_ACTIVE;
2111 return 0;
2112 }
2113
2114 if (tty->termios->c_cflag & CLOCAL)
2115 do_clocal = 1;
2116
2117 /*
2118 * Block waiting for the carrier detect and the line to become
2119 * free (i.e., not in use by the callout). While we are in
2120 * this loop, info->count is dropped by one, so that
2121 * rs_close() knows when to free things. We restore it upon
2122 * exit, either normal or abnormal.
2123 */
2124 retval = 0;
2125 add_wait_queue(&info->open_wait, &wait);
2126#ifdef SERIAL_DEBUG_OPEN
2127 printk("block_til_ready before block: ttys%d, count = %d\n",
2128 info->line, info->count);
2129#endif
2130 spin_lock_irqsave(&info->lock, flags);
2131 if (!tty_hung_up_p(filp))
2132 info->count--;
2133 info->blocked_open++;
2134 while (1) {
2135 if ((tty->termios->c_cflag & CBAUD)) {
2136 unsigned int scratch;
2137
2138 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2139 serial_out(info, UART_ESI_CMD2, UART_MCR);
2140 scratch = serial_in(info, UART_ESI_STAT1);
2141 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2142 serial_out(info, UART_ESI_CMD2, UART_MCR);
2143 serial_out(info, UART_ESI_CMD2,
2144 scratch | UART_MCR_DTR | UART_MCR_RTS);
2145 }
2146 set_current_state(TASK_INTERRUPTIBLE);
2147 if (tty_hung_up_p(filp) ||
2148 !(info->flags & ASYNC_INITIALIZED)) {
2149#ifdef SERIAL_DO_RESTART
2150 if (info->flags & ASYNC_HUP_NOTIFY)
2151 retval = -EAGAIN;
2152 else
2153 retval = -ERESTARTSYS;
2154#else
2155 retval = -EAGAIN;
2156#endif
2157 break;
2158 }
2159
2160 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2161 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2162 do_clocal = 1;
2163
2164 if (!(info->flags & ASYNC_CLOSING) &&
2165 (do_clocal))
2166 break;
2167 if (signal_pending(current)) {
2168 retval = -ERESTARTSYS;
2169 break;
2170 }
2171#ifdef SERIAL_DEBUG_OPEN
2172 printk("block_til_ready blocking: ttys%d, count = %d\n",
2173 info->line, info->count);
2174#endif
2175 spin_unlock_irqrestore(&info->lock, flags);
2176 schedule();
2177 spin_lock_irqsave(&info->lock, flags);
2178 }
2179 set_current_state(TASK_RUNNING);
2180 remove_wait_queue(&info->open_wait, &wait);
2181 if (!tty_hung_up_p(filp))
2182 info->count++;
2183 info->blocked_open--;
2184 spin_unlock_irqrestore(&info->lock, flags);
2185#ifdef SERIAL_DEBUG_OPEN
2186 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2187 info->line, info->count);
2188#endif
2189 if (retval)
2190 return retval;
2191 info->flags |= ASYNC_NORMAL_ACTIVE;
2192 return 0;
2193}
2194
2195/*
2196 * This routine is called whenever a serial port is opened. It
2197 * enables interrupts for a serial port, linking in its async structure into
2198 * the IRQ chain. It also performs the serial-specific
2199 * initialization for the tty structure.
2200 */
2201static int esp_open(struct tty_struct *tty, struct file * filp)
2202{
2203 struct esp_struct *info;
2204 int retval, line;
2205 unsigned long flags;
2206
2207 line = tty->index;
2208 if ((line < 0) || (line >= NR_PORTS))
2209 return -ENODEV;
2210
2211 /* find the port in the chain */
2212
2213 info = ports;
2214
2215 while (info && (info->line != line))
2216 info = info->next_port;
2217
2218 if (!info) {
2219 serial_paranoia_check(info, tty->name, "esp_open");
2220 return -ENODEV;
2221 }
2222
2223#ifdef SERIAL_DEBUG_OPEN
2224 printk("esp_open %s, count = %d\n", tty->name, info->count);
2225#endif
2226 spin_lock_irqsave(&info->lock, flags);
2227 info->count++;
2228 tty->driver_data = info;
2229 info->tty = tty;
2230
5552c28f 2231 spin_unlock_irqrestore(&info->lock, flags);
1da177e4
LT		 2232
2233 /*
2234 * Start up serial port
2235 */
2236 retval = startup(info);
2237 if (retval)
2238 return retval;
2239
2240 retval = block_til_ready(tty, filp, info);
2241 if (retval) {
2242#ifdef SERIAL_DEBUG_OPEN
2243 printk("esp_open returning after block_til_ready with %d\n",
2244 retval);
2245#endif
2246 return retval;
2247 }
2248
2249#ifdef SERIAL_DEBUG_OPEN
2250 printk("esp_open %s successful...", tty->name);
2251#endif
2252 return 0;
2253}
2254
2255/*
2256 * ---------------------------------------------------------------------
2257 * espserial_init() and friends
2258 *
2259 * espserial_init() is called at boot-time to initialize the serial driver.
2260 * ---------------------------------------------------------------------
2261 */
2262
2263/*
2264 * This routine prints out the appropriate serial driver version
2265 * number, and identifies which options were configured into this
2266 * driver.
2267 */
2268
2269static inline void show_serial_version(void)
2270{
2271 printk(KERN_INFO "%s version %s (DMA %u)\n",
2272 serial_name, serial_version, dma);
2273}
2274
2275/*
2276 * This routine is called by espserial_init() to initialize a specific serial
2277 * port.
2278 */
2279static inline int autoconfig(struct esp_struct * info)
2280{
2281 int port_detected = 0;
2282 unsigned long flags;
2283
2284 if (!request_region(info->port, REGION_SIZE, "esp serial"))
2285 return -EIO;
2286
2287 spin_lock_irqsave(&info->lock, flags);
2288 /*
2289 * Check for ESP card
2290 */
2291
2292 if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2293 serial_out(info, UART_ESI_CMD1, 0x00);
2294 serial_out(info, UART_ESI_CMD1, 0x01);
2295
2296 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2297 port_detected = 1;
2298
2299 if (!(info->irq)) {
2300 serial_out(info, UART_ESI_CMD1, 0x02);
2301
2302 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2303 info->irq = 3;
2304 else
2305 info->irq = 4;
2306 }
2307
2308
2309 /* put card in enhanced mode */
2310 /* this prevents access through */
2311 /* the "old" IO ports */
2312 esp_basic_init(info);
2313
2314 /* clear out MCR */
2315 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2316 serial_out(info, UART_ESI_CMD2, UART_MCR);
2317 serial_out(info, UART_ESI_CMD2, 0x00);
2318 }
2319 }
2320 if (!port_detected)
2321 release_region(info->port, REGION_SIZE);
2322
2323 spin_unlock_irqrestore(&info->lock, flags);
2324 return (port_detected);
2325}
2326
b68e31d0 2327static const struct tty_operations esp_ops = {
1da177e4
LT		 2328 .open = esp_open,
2329 .close = rs_close,
2330 .write = rs_write,
2331 .put_char = rs_put_char,
2332 .flush_chars = rs_flush_chars,
2333 .write_room = rs_write_room,
2334 .chars_in_buffer = rs_chars_in_buffer,
2335 .flush_buffer = rs_flush_buffer,
2336 .ioctl = rs_ioctl,
2337 .throttle = rs_throttle,
2338 .unthrottle = rs_unthrottle,
2339 .set_termios = rs_set_termios,
2340 .stop = rs_stop,
2341 .start = rs_start,
2342 .hangup = esp_hangup,
2343 .break_ctl = esp_break,
2344 .wait_until_sent = rs_wait_until_sent,
2345 .tiocmget = esp_tiocmget,
2346 .tiocmset = esp_tiocmset,
2347};
2348
2349/*
2350 * The serial driver boot-time initialization code!
2351 */
2352static int __init espserial_init(void)
2353{
2354 int i, offset;
2355 struct esp_struct * info;
2356 struct esp_struct *last_primary = NULL;
2357 int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2358
2359 esp_driver = alloc_tty_driver(NR_PORTS);
2360 if (!esp_driver)
2361 return -ENOMEM;
2362
2363 for (i = 0; i < NR_PRIMARY; i++) {
2364 if (irq[i] != 0) {
2365 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2366 (irq[i] == 8) || (irq[i] == 13))
2367 irq[i] = 0;
2368 else if (irq[i] == 2)
2369 irq[i] = 9;
2370 }
2371 }
2372
2373 if ((dma != 1) && (dma != 3))
2374 dma = 0;
2375
2376 if ((rx_trigger < 1) || (rx_trigger > 1023))
2377 rx_trigger = 768;
2378
2379 if ((tx_trigger < 1) || (tx_trigger > 1023))
2380 tx_trigger = 768;
2381
2382 if ((flow_off < 1) || (flow_off > 1023))
2383 flow_off = 1016;
2384
2385 if ((flow_on < 1) || (flow_on > 1023))
2386 flow_on = 944;
2387
2388 if ((rx_timeout < 0) || (rx_timeout > 255))
2389 rx_timeout = 128;
2390
2391 if (flow_on >= flow_off)
2392 flow_on = flow_off - 1;
2393
2394 show_serial_version();
2395
2396 /* Initialize the tty_driver structure */
2397
2398 esp_driver->owner = THIS_MODULE;
2399 esp_driver->name = "ttyP";
1da177e4
LT		 2400 esp_driver->major = ESP_IN_MAJOR;
2401 esp_driver->minor_start = 0;
2402 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2403 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2404 esp_driver->init_termios = tty_std_termios;
2405 esp_driver->init_termios.c_cflag =
2406 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2407 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2408 tty_set_operations(esp_driver, &esp_ops);
2409 if (tty_register_driver(esp_driver))
2410 {
2411 printk(KERN_ERR "Couldn't register esp serial driver");
2412 put_tty_driver(esp_driver);
2413 return 1;
2414 }
2415
dd00cc48 2416 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
1da177e4
LT		 2417
2418 if (!info)
2419 {
2420 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2421 tty_unregister_driver(esp_driver);
2422 put_tty_driver(esp_driver);
2423 return 1;
2424 }
2425
8f56a31a 2426 spin_lock_init(&info->lock);
1da177e4
LT		 2427 /* rx_trigger, tx_trigger are needed by autoconfig */
2428 info->config.rx_trigger = rx_trigger;
2429 info->config.tx_trigger = tx_trigger;
2430
2431 i = 0;
2432 offset = 0;
2433
2434 do {
2435 info->port = esp[i] + offset;
2436 info->irq = irq[i];
2437 info->line = (i * 8) + (offset / 8);
2438
2439 if (!autoconfig(info)) {
2440 i++;
2441 offset = 0;
2442 continue;
2443 }
2444
2445 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2446 info->flags = STD_COM_FLAGS;
2447 if (info->custom_divisor)
2448 info->flags |= ASYNC_SPD_CUST;
2449 info->magic = ESP_MAGIC;
2450 info->close_delay = 5*HZ/10;
2451 info->closing_wait = 30*HZ;
1da177e4
LT		 2452 info->config.rx_timeout = rx_timeout;
2453 info->config.flow_on = flow_on;
2454 info->config.flow_off = flow_off;
2455 info->config.pio_threshold = pio_threshold;
2456 info->next_port = ports;
2457 init_waitqueue_head(&info->open_wait);
2458 init_waitqueue_head(&info->close_wait);
2459 init_waitqueue_head(&info->delta_msr_wait);
2460 init_waitqueue_head(&info->break_wait);
1da177e4
LT		 2461 ports = info;
2462 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2463 info->line, info->port, info->irq);
2464
2465 if (info->line % 8) {
2466 printk("secondary port\n");
2467 /* 8 port cards can't do DMA */
2468 info->stat_flags |= ESP_STAT_NEVER_DMA;
2469
2470 if (last_primary)
2471 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2472 } else {
2473 printk("primary port\n");
2474 last_primary = info;
2475 irq[i] = info->irq;
2476 }
2477
2478 if (!dma)
2479 info->stat_flags |= ESP_STAT_NEVER_DMA;
2480
dd00cc48 2481 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
1da177e4
LT		 2482 if (!info)
2483 {
2484 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2485
2486 /* allow use of the already detected ports */
2487 return 0;
2488 }
2489
80d38f9a 2490 spin_lock_init(&info->lock);
1da177e4
LT		 2491 /* rx_trigger, tx_trigger are needed by autoconfig */
2492 info->config.rx_trigger = rx_trigger;
2493 info->config.tx_trigger = tx_trigger;
2494
2495 if (offset == 56) {
2496 i++;
2497 offset = 0;
2498 } else {
2499 offset += 8;
2500 }
2501 } while (i < NR_PRIMARY);
2502
2503 /* free the last port memory allocation */
2504 kfree(info);
2505
2506 return 0;
2507}
2508
2509static void __exit espserial_exit(void)
2510{
2511 int e1;
2512 struct esp_struct *temp_async;
2513 struct esp_pio_buffer *pio_buf;
2514
2515 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2516 if ((e1 = tty_unregister_driver(esp_driver)))
2517 printk("SERIAL: failed to unregister serial driver (%d)\n",
2518 e1);
2519 put_tty_driver(esp_driver);
2520
2521 while (ports) {
2522 if (ports->port) {
2523 release_region(ports->port, REGION_SIZE);
2524 }
2525 temp_async = ports->next_port;
2526 kfree(ports);
2527 ports = temp_async;
2528 }
2529
2530 if (dma_buffer)
2531 free_pages((unsigned long)dma_buffer,
2532 get_order(DMA_BUFFER_SZ));
2533
1da177e4
LT		 2534 while (free_pio_buf) {
2535 pio_buf = free_pio_buf->next;
2536 kfree(free_pio_buf);
2537 free_pio_buf = pio_buf;
2538 }
2539}
2540
2541module_init(espserial_init);
2542module_exit(espserial_exit);
Linux 6.x block layer and io_uring tree(s)