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char: switch gs, cyclades and esp to return int for put_char
[linux-2.6/linux-2.6-openrd.git] / drivers / char / esp.c
blob996d3230c929e8e8577a5e903aeebb9ef1da82ff
1 /*
2 * esp.c - driver for Hayes ESP serial cards
3 *
4 * --- Notices from serial.c, upon which this driver is based ---
5 *
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 *
8 * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
9 * much more extensible to support other serial cards based on the
10 * 16450/16550A UART's. Added support for the AST FourPort and the
11 * Accent Async board.
12 *
13 * set_serial_info fixed to set the flags, custom divisor, and uart
14 * type fields. Fix suggested by Michael K. Johnson 12/12/92.
15 *
16 * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
17 *
18 * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
19 *
20 * rs_set_termios fixed to look also for changes of the input
21 * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
22 * Bernd Anhäupl 05/17/96.
23 *
24 * --- End of notices from serial.c ---
25 *
26 * Support for the ESP serial card by Andrew J. Robinson
27 * <arobinso@nyx.net> (Card detection routine taken from a patch
28 * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
29 * by Chris Faylor.
30 *
31 * Most recent changes: (Andrew J. Robinson)
32 * Support for PIO mode. This allows the driver to work properly with
33 * multiport cards.
34 *
35 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
36 * several cleanups, use module_init/module_exit, etc
37 *
38 * This module exports the following rs232 io functions:
39 *
40 * int espserial_init(void);
41 */
42
43 #include <linux/module.h>
44 #include <linux/errno.h>
45 #include <linux/signal.h>
46 #include <linux/sched.h>
47 #include <linux/interrupt.h>
48 #include <linux/tty.h>
49 #include <linux/tty_flip.h>
50 #include <linux/serial.h>
51 #include <linux/serialP.h>
52 #include <linux/serial_reg.h>
53 #include <linux/major.h>
54 #include <linux/string.h>
55 #include <linux/fcntl.h>
56 #include <linux/ptrace.h>
57 #include <linux/ioport.h>
58 #include <linux/mm.h>
59 #include <linux/init.h>
60 #include <linux/delay.h>
61 #include <linux/bitops.h>
62
63 #include <asm/system.h>
64 #include <asm/io.h>
65
66 #include <asm/dma.h>
67 #include <linux/slab.h>
68 #include <asm/uaccess.h>
69
70 #include <linux/hayesesp.h>
71
72 #define NR_PORTS 64 /* maximum number of ports */
73 #define NR_PRIMARY 8 /* maximum number of primary ports */
74 #define REGION_SIZE 8 /* size of io region to request */
75
76 /* The following variables can be set by giving module options */
77 static int irq[NR_PRIMARY]; /* IRQ for each base port */
78 static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
79 static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
80 static unsigned int rx_trigger = ESP_RX_TRIGGER;
81 static unsigned int tx_trigger = ESP_TX_TRIGGER;
82 static unsigned int flow_off = ESP_FLOW_OFF;
83 static unsigned int flow_on = ESP_FLOW_ON;
84 static unsigned int rx_timeout = ESP_RX_TMOUT;
85 static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
86
87 MODULE_LICENSE("GPL");
88
89 module_param_array(irq, int, NULL, 0);
90 module_param_array(divisor, uint, NULL, 0);
91 module_param(dma, uint, 0);
92 module_param(rx_trigger, uint, 0);
93 module_param(tx_trigger, uint, 0);
94 module_param(flow_off, uint, 0);
95 module_param(flow_on, uint, 0);
96 module_param(rx_timeout, uint, 0);
97 module_param(pio_threshold, uint, 0);
98
99 /* END */
100
101 static char *dma_buffer;
102 static int dma_bytes;
103 static struct esp_pio_buffer *free_pio_buf;
104
105 #define DMA_BUFFER_SZ 1024
106
107 #define WAKEUP_CHARS 1024
108
109 static char serial_name[] __initdata = "ESP serial driver";
110 static char serial_version[] __initdata = "2.2";
111
112 static struct tty_driver *esp_driver;
113
114 /*
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
136 static struct esp_struct *ports;
137
138 static void change_speed(struct esp_struct *info);
139 static 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
150 static 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
171 static inline unsigned int serial_in(struct esp_struct *info, int offset)
172 {
173 return inb(info->port + offset);
174 }
175
176 static 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 */
190 static 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
207 static 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
245 static DEFINE_SPINLOCK(pio_lock);
246
247 static 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
263 static 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
272 static 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)) {
322 int flag = 0;
323
324 if (err_buf->data[i] & 0x04) {
325 flag = TTY_BREAK;
326 if (info->flags & ASYNC_SAK)
327 do_SAK(tty);
328 }
329 else if (err_buf->data[i] & 0x02)
330 flag = TTY_FRAME;
331 else if (err_buf->data[i] & 0x01)
332 flag = TTY_PARITY;
333 tty_insert_flip_char(tty, pio_buf->data[i], flag);
334 }
335 }
336
337 tty_schedule_flip(tty);
338
339 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
340 release_pio_buffer(pio_buf);
341 release_pio_buffer(err_buf);
342 }
343
344 static 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
363 static 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
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
380 if (num_bytes > 0) {
381 tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
382
383 status &= (0x1c & info->read_status_mask);
384
385 /* Is the status significant or do we throw the last byte ? */
386 if (!(status & info->ignore_status_mask)) {
387 int statflag = 0;
388
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);
403 }
404 tty_schedule_flip(tty);
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
417 static 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) {
466 if (info->tty)
467 tty_wakeup(info->tty);
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 */
485 static 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) {
505 if (info->tty)
506 tty_wakeup(info->tty);
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
533 static 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
567 static 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
598 tty_hangup(info->tty);
599 }
600 }
601 }
602
603 /*
604 * This is the serial driver's interrupt routine
605 */
606 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
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
659 num_bytes = tty_buffer_request_room(info->tty, num_bytes);
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
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
725 static 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
786 static 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
840 retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
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
911 out:
912 spin_unlock_irqrestore(&info->lock, flags);
913 out_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 */
921 static 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 */
1004 static 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 */
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
1159 static int 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 int ret = 0;
1164
1165 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1166 return 0;
1167
1168 if (!info->xmit_buf)
1169 return 0;
1170
1171 spin_lock_irqsave(&info->lock, flags);
1172 if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
1173 info->xmit_buf[info->xmit_head++] = ch;
1174 info->xmit_head &= ESP_XMIT_SIZE-1;
1175 info->xmit_cnt++;
1176 ret = 1;
1177 }
1178 spin_unlock_irqrestore(&info->lock, flags);
1179 return ret;
1180 }
1181
1182 static void rs_flush_chars(struct tty_struct *tty)
1183 {
1184 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1185 unsigned long flags;
1186
1187 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1188 return;
1189
1190 spin_lock_irqsave(&info->lock, flags);
1191
1192 if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1193 goto out;
1194
1195 if (!(info->IER & UART_IER_THRI)) {
1196 info->IER |= UART_IER_THRI;
1197 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1198 serial_out(info, UART_ESI_CMD2, info->IER);
1199 }
1200 out:
1201 spin_unlock_irqrestore(&info->lock, flags);
1202 }
1203
1204 static int rs_write(struct tty_struct * tty,
1205 const unsigned char *buf, int count)
1206 {
1207 int c, t, ret = 0;
1208 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1209 unsigned long flags;
1210
1211 if (serial_paranoia_check(info, tty->name, "rs_write"))
1212 return 0;
1213
1214 if (!info->xmit_buf)
1215 return 0;
1216
1217 while (1) {
1218 /* Thanks to R. Wolff for suggesting how to do this with */
1219 /* interrupts enabled */
1220
1221 c = count;
1222 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1223
1224 if (t < c)
1225 c = t;
1226
1227 t = ESP_XMIT_SIZE - info->xmit_head;
1228
1229 if (t < c)
1230 c = t;
1231
1232 if (c <= 0)
1233 break;
1234
1235 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1236
1237 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1238 info->xmit_cnt += c;
1239 buf += c;
1240 count -= c;
1241 ret += c;
1242 }
1243
1244 spin_lock_irqsave(&info->lock, flags);
1245
1246 if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1247 info->IER |= UART_IER_THRI;
1248 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1249 serial_out(info, UART_ESI_CMD2, info->IER);
1250 }
1251
1252 spin_unlock_irqrestore(&info->lock, flags);
1253 return ret;
1254 }
1255
1256 static int rs_write_room(struct tty_struct *tty)
1257 {
1258 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1259 int ret;
1260 unsigned long flags;
1261
1262 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1263 return 0;
1264
1265 spin_lock_irqsave(&info->lock, flags);
1266
1267 ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1268 if (ret < 0)
1269 ret = 0;
1270 spin_unlock_irqrestore(&info->lock, flags);
1271 return ret;
1272 }
1273
1274 static int rs_chars_in_buffer(struct tty_struct *tty)
1275 {
1276 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1277
1278 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1279 return 0;
1280 return info->xmit_cnt;
1281 }
1282
1283 static void rs_flush_buffer(struct tty_struct *tty)
1284 {
1285 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1286 unsigned long flags;
1287
1288 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1289 return;
1290 spin_lock_irqsave(&info->lock, flags);
1291 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1292 spin_unlock_irqrestore(&info->lock, flags);
1293 tty_wakeup(tty);
1294 }
1295
1296 /*
1297 * ------------------------------------------------------------
1298 * rs_throttle()
1299 *
1300 * This routine is called by the upper-layer tty layer to signal that
1301 * incoming characters should be throttled.
1302 * ------------------------------------------------------------
1303 */
1304 static void rs_throttle(struct tty_struct * tty)
1305 {
1306 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1307 unsigned long flags;
1308 #ifdef SERIAL_DEBUG_THROTTLE
1309 char buf[64];
1310
1311 printk("throttle %s: %d....\n", tty_name(tty, buf),
1312 tty->ldisc.chars_in_buffer(tty));
1313 #endif
1314
1315 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1316 return;
1317
1318 spin_lock_irqsave(&info->lock, flags);
1319 info->IER &= ~UART_IER_RDI;
1320 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1321 serial_out(info, UART_ESI_CMD2, info->IER);
1322 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1323 serial_out(info, UART_ESI_CMD2, 0x00);
1324 spin_unlock_irqrestore(&info->lock, flags);
1325 }
1326
1327 static void rs_unthrottle(struct tty_struct * tty)
1328 {
1329 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1330 unsigned long flags;
1331 #ifdef SERIAL_DEBUG_THROTTLE
1332 char buf[64];
1333
1334 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1335 tty->ldisc.chars_in_buffer(tty));
1336 #endif
1337
1338 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1339 return;
1340
1341 spin_lock_irqsave(&info->lock, flags);
1342 info->IER |= UART_IER_RDI;
1343 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1344 serial_out(info, UART_ESI_CMD2, info->IER);
1345 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1346 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1347 spin_unlock_irqrestore(&info->lock, flags);
1348 }
1349
1350 /*
1351 * ------------------------------------------------------------
1352 * rs_ioctl() and friends
1353 * ------------------------------------------------------------
1354 */
1355
1356 static int get_serial_info(struct esp_struct * info,
1357 struct serial_struct __user *retinfo)
1358 {
1359 struct serial_struct tmp;
1360
1361 lock_kernel();
1362 memset(&tmp, 0, sizeof(tmp));
1363 tmp.type = PORT_16550A;
1364 tmp.line = info->line;
1365 tmp.port = info->port;
1366 tmp.irq = info->irq;
1367 tmp.flags = info->flags;
1368 tmp.xmit_fifo_size = 1024;
1369 tmp.baud_base = BASE_BAUD;
1370 tmp.close_delay = info->close_delay;
1371 tmp.closing_wait = info->closing_wait;
1372 tmp.custom_divisor = info->custom_divisor;
1373 tmp.hub6 = 0;
1374 unlock_kernel();
1375 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1376 return -EFAULT;
1377 return 0;
1378 }
1379
1380 static int get_esp_config(struct esp_struct * info,
1381 struct hayes_esp_config __user *retinfo)
1382 {
1383 struct hayes_esp_config tmp;
1384
1385 if (!retinfo)
1386 return -EFAULT;
1387
1388 memset(&tmp, 0, sizeof(tmp));
1389 lock_kernel();
1390 tmp.rx_timeout = info->config.rx_timeout;
1391 tmp.rx_trigger = info->config.rx_trigger;
1392 tmp.tx_trigger = info->config.tx_trigger;
1393 tmp.flow_off = info->config.flow_off;
1394 tmp.flow_on = info->config.flow_on;
1395 tmp.pio_threshold = info->config.pio_threshold;
1396 tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1397 unlock_kernel();
1398
1399 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1400 }
1401
1402 static int set_serial_info(struct esp_struct * info,
1403 struct serial_struct __user *new_info)
1404 {
1405 struct serial_struct new_serial;
1406 struct esp_struct old_info;
1407 unsigned int change_irq;
1408 int retval = 0;
1409 struct esp_struct *current_async;
1410
1411 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1412 return -EFAULT;
1413 old_info = *info;
1414
1415 if ((new_serial.type != PORT_16550A) ||
1416 (new_serial.hub6) ||
1417 (info->port != new_serial.port) ||
1418 (new_serial.baud_base != BASE_BAUD) ||
1419 (new_serial.irq > 15) ||
1420 (new_serial.irq < 2) ||
1421 (new_serial.irq == 6) ||
1422 (new_serial.irq == 8) ||
1423 (new_serial.irq == 13))
1424 return -EINVAL;
1425
1426 change_irq = new_serial.irq != info->irq;
1427
1428 if (change_irq && (info->line % 8))
1429 return -EINVAL;
1430
1431 if (!capable(CAP_SYS_ADMIN)) {
1432 if (change_irq ||
1433 (new_serial.close_delay != info->close_delay) ||
1434 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1435 (info->flags & ~ASYNC_USR_MASK)))
1436 return -EPERM;
1437 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1438 (new_serial.flags & ASYNC_USR_MASK));
1439 info->custom_divisor = new_serial.custom_divisor;
1440 } else {
1441 if (new_serial.irq == 2)
1442 new_serial.irq = 9;
1443
1444 if (change_irq) {
1445 current_async = ports;
1446
1447 while (current_async) {
1448 if ((current_async->line >= info->line) &&
1449 (current_async->line < (info->line + 8))) {
1450 if (current_async == info) {
1451 if (current_async->count > 1)
1452 return -EBUSY;
1453 } else if (current_async->count)
1454 return -EBUSY;
1455 }
1456
1457 current_async = current_async->next_port;
1458 }
1459 }
1460
1461 /*
1462 * OK, past this point, all the error checking has been done.
1463 * At this point, we start making changes.....
1464 */
1465
1466 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1467 (new_serial.flags & ASYNC_FLAGS));
1468 info->custom_divisor = new_serial.custom_divisor;
1469 info->close_delay = new_serial.close_delay * HZ/100;
1470 info->closing_wait = new_serial.closing_wait * HZ/100;
1471
1472 if (change_irq) {
1473 /*
1474 * We need to shutdown the serial port at the old
1475 * port/irq combination.
1476 */
1477 shutdown(info);
1478
1479 current_async = ports;
1480
1481 while (current_async) {
1482 if ((current_async->line >= info->line) &&
1483 (current_async->line < (info->line + 8)))
1484 current_async->irq = new_serial.irq;
1485
1486 current_async = current_async->next_port;
1487 }
1488
1489 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1490 if (info->irq == 9)
1491 serial_out(info, UART_ESI_CMD2, 0x02);
1492 else
1493 serial_out(info, UART_ESI_CMD2, info->irq);
1494 }
1495 }
1496
1497 if (info->flags & ASYNC_INITIALIZED) {
1498 if (((old_info.flags & ASYNC_SPD_MASK) !=
1499 (info->flags & ASYNC_SPD_MASK)) ||
1500 (old_info.custom_divisor != info->custom_divisor)) {
1501 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1502 info->tty->alt_speed = 57600;
1503 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1504 info->tty->alt_speed = 115200;
1505 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1506 info->tty->alt_speed = 230400;
1507 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1508 info->tty->alt_speed = 460800;
1509 change_speed(info);
1510 }
1511 } else
1512 retval = startup(info);
1513
1514 return retval;
1515 }
1516
1517 static int set_esp_config(struct esp_struct * info,
1518 struct hayes_esp_config __user * new_info)
1519 {
1520 struct hayes_esp_config new_config;
1521 unsigned int change_dma;
1522 int retval = 0;
1523 struct esp_struct *current_async;
1524 unsigned long flags;
1525
1526 /* Perhaps a non-sysadmin user should be able to do some of these */
1527 /* operations. I haven't decided yet. */
1528
1529 if (!capable(CAP_SYS_ADMIN))
1530 return -EPERM;
1531
1532 if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1533 return -EFAULT;
1534
1535 if ((new_config.flow_on >= new_config.flow_off) ||
1536 (new_config.rx_trigger < 1) ||
1537 (new_config.tx_trigger < 1) ||
1538 (new_config.flow_off < 1) ||
1539 (new_config.flow_on < 1) ||
1540 (new_config.rx_trigger > 1023) ||
1541 (new_config.tx_trigger > 1023) ||
1542 (new_config.flow_off > 1023) ||
1543 (new_config.flow_on > 1023) ||
1544 (new_config.pio_threshold < 0) ||
1545 (new_config.pio_threshold > 1024))
1546 return -EINVAL;
1547
1548 if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1549 new_config.dma_channel = 0;
1550
1551 if (info->stat_flags & ESP_STAT_NEVER_DMA)
1552 change_dma = new_config.dma_channel;
1553 else
1554 change_dma = (new_config.dma_channel != dma);
1555
1556 if (change_dma) {
1557 if (new_config.dma_channel) {
1558 /* PIO mode to DMA mode transition OR */
1559 /* change current DMA channel */
1560
1561 current_async = ports;
1562
1563 while (current_async) {
1564 if (current_async == info) {
1565 if (current_async->count > 1)
1566 return -EBUSY;
1567 } else if (current_async->count)
1568 return -EBUSY;
1569
1570 current_async =
1571 current_async->next_port;
1572 }
1573
1574 shutdown(info);
1575 dma = new_config.dma_channel;
1576 info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1577
1578 /* all ports must use the same DMA channel */
1579
1580 spin_lock_irqsave(&info->lock, flags);
1581 current_async = ports;
1582
1583 while (current_async) {
1584 esp_basic_init(current_async);
1585 current_async = current_async->next_port;
1586 }
1587 spin_unlock_irqrestore(&info->lock, flags);
1588 } else {
1589 /* DMA mode to PIO mode only */
1590
1591 if (info->count > 1)
1592 return -EBUSY;
1593
1594 shutdown(info);
1595 spin_lock_irqsave(&info->lock, flags);
1596 info->stat_flags |= ESP_STAT_NEVER_DMA;
1597 esp_basic_init(info);
1598 spin_unlock_irqrestore(&info->lock, flags);
1599 }
1600 }
1601
1602 info->config.pio_threshold = new_config.pio_threshold;
1603
1604 if ((new_config.flow_off != info->config.flow_off) ||
1605 (new_config.flow_on != info->config.flow_on)) {
1606 info->config.flow_off = new_config.flow_off;
1607 info->config.flow_on = new_config.flow_on;
1608
1609 spin_lock_irqsave(&info->lock, flags);
1610 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1611 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1612 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1613 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1614 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1615 spin_unlock_irqrestore(&info->lock, flags);
1616 }
1617
1618 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1619 (new_config.tx_trigger != info->config.tx_trigger)) {
1620 info->config.rx_trigger = new_config.rx_trigger;
1621 info->config.tx_trigger = new_config.tx_trigger;
1622 spin_lock_irqsave(&info->lock, flags);
1623 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1624 serial_out(info, UART_ESI_CMD2,
1625 new_config.rx_trigger >> 8);
1626 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1627 serial_out(info, UART_ESI_CMD2,
1628 new_config.tx_trigger >> 8);
1629 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1630 spin_unlock_irqrestore(&info->lock, flags);
1631 }
1632
1633 if (new_config.rx_timeout != info->config.rx_timeout) {
1634 info->config.rx_timeout = new_config.rx_timeout;
1635 spin_lock_irqsave(&info->lock, flags);
1636
1637 if (info->IER & UART_IER_RDI) {
1638 serial_out(info, UART_ESI_CMD1,
1639 ESI_SET_RX_TIMEOUT);
1640 serial_out(info, UART_ESI_CMD2,
1641 new_config.rx_timeout);
1642 }
1643
1644 spin_unlock_irqrestore(&info->lock, flags);
1645 }
1646
1647 if (!(info->flags & ASYNC_INITIALIZED))
1648 retval = startup(info);
1649
1650 return retval;
1651 }
1652
1653 /*
1654 * get_lsr_info - get line status register info
1655 *
1656 * Purpose: Let user call ioctl() to get info when the UART physically
1657 * is emptied. On bus types like RS485, the transmitter must
1658 * release the bus after transmitting. This must be done when
1659 * the transmit shift register is empty, not be done when the
1660 * transmit holding register is empty. This functionality
1661 * allows an RS485 driver to be written in user space.
1662 */
1663 static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1664 {
1665 unsigned char status;
1666 unsigned int result;
1667 unsigned long flags;
1668
1669 spin_lock_irqsave(&info->lock, flags);
1670 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1671 status = serial_in(info, UART_ESI_STAT1);
1672 spin_unlock_irqrestore(&info->lock, flags);
1673 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1674 return put_user(result,value);
1675 }
1676
1677
1678 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1679 {
1680 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1681 unsigned char control, status;
1682 unsigned long flags;
1683
1684 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1685 return -ENODEV;
1686 if (tty->flags & (1 << TTY_IO_ERROR))
1687 return -EIO;
1688
1689 control = info->MCR;
1690
1691 spin_lock_irqsave(&info->lock, flags);
1692 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1693 status = serial_in(info, UART_ESI_STAT2);
1694 spin_unlock_irqrestore(&info->lock, flags);
1695
1696 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1697 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1698 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1699 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1700 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1701 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1702 }
1703
1704 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1705 unsigned int set, unsigned int clear)
1706 {
1707 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1708 unsigned long flags;
1709
1710 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1711 return -ENODEV;
1712 if (tty->flags & (1 << TTY_IO_ERROR))
1713 return -EIO;
1714
1715 spin_lock_irqsave(&info->lock, flags);
1716
1717 if (set & TIOCM_RTS)
1718 info->MCR |= UART_MCR_RTS;
1719 if (set & TIOCM_DTR)
1720 info->MCR |= UART_MCR_DTR;
1721
1722 if (clear & TIOCM_RTS)
1723 info->MCR &= ~UART_MCR_RTS;
1724 if (clear & TIOCM_DTR)
1725 info->MCR &= ~UART_MCR_DTR;
1726
1727 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1728 serial_out(info, UART_ESI_CMD2, UART_MCR);
1729 serial_out(info, UART_ESI_CMD2, info->MCR);
1730
1731 spin_unlock_irqrestore(&info->lock, flags);
1732 return 0;
1733 }
1734
1735 /*
1736 * rs_break() --- routine which turns the break handling on or off
1737 */
1738 static void esp_break(struct tty_struct *tty, int break_state)
1739 {
1740 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1741 unsigned long flags;
1742
1743 if (serial_paranoia_check(info, tty->name, "esp_break"))
1744 return;
1745
1746 if (break_state == -1) {
1747 spin_lock_irqsave(&info->lock, flags);
1748 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1749 serial_out(info, UART_ESI_CMD2, 0x01);
1750 spin_unlock_irqrestore(&info->lock, flags);
1751
1752 /* FIXME - new style wait needed here */
1753 interruptible_sleep_on(&info->break_wait);
1754 } else {
1755 spin_lock_irqsave(&info->lock, flags);
1756 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1757 serial_out(info, UART_ESI_CMD2, 0x00);
1758 spin_unlock_irqrestore(&info->lock, flags);
1759 }
1760 }
1761
1762 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1763 unsigned int cmd, unsigned long arg)
1764 {
1765 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1766 struct async_icount cprev, cnow; /* kernel counter temps */
1767 struct serial_icounter_struct __user *p_cuser; /* user space */
1768 void __user *argp = (void __user *)arg;
1769 unsigned long flags;
1770 int ret;
1771
1772 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1773 return -ENODEV;
1774
1775 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1776 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1777 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1778 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1779 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1780 if (tty->flags & (1 << TTY_IO_ERROR))
1781 return -EIO;
1782 }
1783
1784 switch (cmd) {
1785 case TIOCGSERIAL:
1786 return get_serial_info(info, argp);
1787 case TIOCSSERIAL:
1788 lock_kernel();
1789 ret = set_serial_info(info, argp);
1790 unlock_kernel();
1791 return ret;
1792 case TIOCSERCONFIG:
1793 /* do not reconfigure after initial configuration */
1794 return 0;
1795
1796 case TIOCSERGWILD:
1797 return put_user(0L, (unsigned long __user *)argp);
1798
1799 case TIOCSERGETLSR: /* Get line status register */
1800 return get_lsr_info(info, argp);
1801
1802 case TIOCSERSWILD:
1803 if (!capable(CAP_SYS_ADMIN))
1804 return -EPERM;
1805 return 0;
1806
1807 /*
1808 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1809 * - mask passed in arg for lines of interest
1810 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1811 * Caller should use TIOCGICOUNT to see which one it was
1812 */
1813 case TIOCMIWAIT:
1814 spin_lock_irqsave(&info->lock, flags);
1815 cprev = info->icount; /* note the counters on entry */
1816 spin_unlock_irqrestore(&info->lock, flags);
1817 while (1) {
1818 /* FIXME: convert to new style wakeup */
1819 interruptible_sleep_on(&info->delta_msr_wait);
1820 /* see if a signal did it */
1821 if (signal_pending(current))
1822 return -ERESTARTSYS;
1823 spin_lock_irqsave(&info->lock, flags);
1824 cnow = info->icount; /* atomic copy */
1825 spin_unlock_irqrestore(&info->lock, flags);
1826 if (cnow.rng == cprev.rng &&
1827 cnow.dsr == cprev.dsr &&
1828 cnow.dcd == cprev.dcd &&
1829 cnow.cts == cprev.cts)
1830 return -EIO; /* no change => error */
1831 if (((arg & TIOCM_RNG) &&
1832 (cnow.rng != cprev.rng)) ||
1833 ((arg & TIOCM_DSR) &&
1834 (cnow.dsr != cprev.dsr)) ||
1835 ((arg & TIOCM_CD) &&
1836 (cnow.dcd != cprev.dcd)) ||
1837 ((arg & TIOCM_CTS) &&
1838 (cnow.cts != cprev.cts)) ) {
1839 return 0;
1840 }
1841 cprev = cnow;
1842 }
1843 /* NOTREACHED */
1844
1845 /*
1846 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1847 * Return: write counters to the user passed counter struct
1848 * NB: both 1->0 and 0->1 transitions are counted except for
1849 * RI where only 0->1 is counted.
1850 */
1851 case TIOCGICOUNT:
1852 spin_lock_irqsave(&info->lock, flags);
1853 cnow = info->icount;
1854 spin_unlock_irqrestore(&info->lock, flags);
1855 p_cuser = argp;
1856 if (put_user(cnow.cts, &p_cuser->cts) ||
1857 put_user(cnow.dsr, &p_cuser->dsr) ||
1858 put_user(cnow.rng, &p_cuser->rng) ||
1859 put_user(cnow.dcd, &p_cuser->dcd))
1860 return -EFAULT;
1861
1862 return 0;
1863 case TIOCGHAYESESP:
1864 return get_esp_config(info, argp);
1865 case TIOCSHAYESESP:
1866 lock_kernel();
1867 ret = set_esp_config(info, argp);
1868 unlock_kernel();
1869 return ret;
1870 default:
1871 return -ENOIOCTLCMD;
1872 }
1873 return 0;
1874 }
1875
1876 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1877 {
1878 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1879 unsigned long flags;
1880
1881 change_speed(info);
1882
1883 spin_lock_irqsave(&info->lock, flags);
1884
1885 /* Handle transition to B0 status */
1886 if ((old_termios->c_cflag & CBAUD) &&
1887 !(tty->termios->c_cflag & CBAUD)) {
1888 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1889 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1890 serial_out(info, UART_ESI_CMD2, UART_MCR);
1891 serial_out(info, UART_ESI_CMD2, info->MCR);
1892 }
1893
1894 /* Handle transition away from B0 status */
1895 if (!(old_termios->c_cflag & CBAUD) &&
1896 (tty->termios->c_cflag & CBAUD)) {
1897 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1898 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1899 serial_out(info, UART_ESI_CMD2, UART_MCR);
1900 serial_out(info, UART_ESI_CMD2, info->MCR);
1901 }
1902
1903 spin_unlock_irqrestore(&info->lock, flags);
1904
1905 /* Handle turning of CRTSCTS */
1906 if ((old_termios->c_cflag & CRTSCTS) &&
1907 !(tty->termios->c_cflag & CRTSCTS)) {
1908 rs_start(tty);
1909 }
1910 }
1911
1912 /*
1913 * ------------------------------------------------------------
1914 * rs_close()
1915 *
1916 * This routine is called when the serial port gets closed. First, we
1917 * wait for the last remaining data to be sent. Then, we unlink its
1918 * async structure from the interrupt chain if necessary, and we free
1919 * that IRQ if nothing is left in the chain.
1920 * ------------------------------------------------------------
1921 */
1922 static void rs_close(struct tty_struct *tty, struct file * filp)
1923 {
1924 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1925 unsigned long flags;
1926
1927 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1928 return;
1929
1930 spin_lock_irqsave(&info->lock, flags);
1931
1932 if (tty_hung_up_p(filp)) {
1933 DBG_CNT("before DEC-hung");
1934 goto out;
1935 }
1936
1937 #ifdef SERIAL_DEBUG_OPEN
1938 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1939 #endif
1940 if ((tty->count == 1) && (info->count != 1)) {
1941 /*
1942 * Uh, oh. tty->count is 1, which means that the tty
1943 * structure will be freed. Info->count should always
1944 * be one in these conditions. If it's greater than
1945 * one, we've got real problems, since it means the
1946 * serial port won't be shutdown.
1947 */
1948 printk("rs_close: bad serial port count; tty->count is 1, "
1949 "info->count is %d\n", info->count);
1950 info->count = 1;
1951 }
1952 if (--info->count < 0) {
1953 printk("rs_close: bad serial port count for ttys%d: %d\n",
1954 info->line, info->count);
1955 info->count = 0;
1956 }
1957 if (info->count) {
1958 DBG_CNT("before DEC-2");
1959 goto out;
1960 }
1961 info->flags |= ASYNC_CLOSING;
1962
1963 spin_unlock_irqrestore(&info->lock, flags);
1964 /*
1965 * Now we wait for the transmit buffer to clear; and we notify
1966 * the line discipline to only process XON/XOFF characters.
1967 */
1968 tty->closing = 1;
1969 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1970 tty_wait_until_sent(tty, info->closing_wait);
1971 /*
1972 * At this point we stop accepting input. To do this, we
1973 * disable the receive line status interrupts, and tell the
1974 * interrupt driver to stop checking the data ready bit in the
1975 * line status register.
1976 */
1977 /* info->IER &= ~UART_IER_RLSI; */
1978 info->IER &= ~UART_IER_RDI;
1979 info->read_status_mask &= ~UART_LSR_DR;
1980 if (info->flags & ASYNC_INITIALIZED) {
1981
1982 spin_lock_irqsave(&info->lock, flags);
1983 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1984 serial_out(info, UART_ESI_CMD2, info->IER);
1985
1986 /* disable receive timeout */
1987 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1988 serial_out(info, UART_ESI_CMD2, 0x00);
1989
1990 spin_unlock_irqrestore(&info->lock, flags);
1991
1992 /*
1993 * Before we drop DTR, make sure the UART transmitter
1994 * has completely drained; this is especially
1995 * important if there is a transmit FIFO!
1996 */
1997 rs_wait_until_sent(tty, info->timeout);
1998 }
1999 shutdown(info);
2000 rs_flush_buffer(tty);
2001 tty_ldisc_flush(tty);
2002 tty->closing = 0;
2003 info->tty = NULL;
2004
2005 if (info->blocked_open) {
2006 if (info->close_delay) {
2007 msleep_interruptible(jiffies_to_msecs(info->close_delay));
2008 }
2009 wake_up_interruptible(&info->open_wait);
2010 }
2011 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2012 wake_up_interruptible(&info->close_wait);
2013 return;
2014
2015 out:
2016 spin_unlock_irqrestore(&info->lock, flags);
2017 }
2018
2019 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2020 {
2021 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2022 unsigned long orig_jiffies, char_time;
2023 unsigned long flags;
2024
2025 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2026 return;
2027
2028 orig_jiffies = jiffies;
2029 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2030
2031 if (!char_time)
2032 char_time = 1;
2033
2034 spin_lock_irqsave(&info->lock, flags);
2035 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2036 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2037
2038 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2039 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2040
2041 spin_unlock_irqrestore(&info->lock, flags);
2042 msleep_interruptible(jiffies_to_msecs(char_time));
2043
2044 if (signal_pending(current))
2045 return;
2046
2047 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2048 return;
2049
2050 spin_lock_irqsave(&info->lock, flags);
2051 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2052 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2053 }
2054 spin_unlock_irqrestore(&info->lock, flags);
2055 set_current_state(TASK_RUNNING);
2056 }
2057
2058 /*
2059 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2060 */
2061 static void esp_hangup(struct tty_struct *tty)
2062 {
2063 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2064
2065 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2066 return;
2067
2068 rs_flush_buffer(tty);
2069 shutdown(info);
2070 info->count = 0;
2071 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2072 info->tty = NULL;
2073 wake_up_interruptible(&info->open_wait);
2074 }
2075
2076 /*
2077 * ------------------------------------------------------------
2078 * esp_open() and friends
2079 * ------------------------------------------------------------
2080 */
2081 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2082 struct esp_struct *info)
2083 {
2084 DECLARE_WAITQUEUE(wait, current);
2085 int retval;
2086 int do_clocal = 0;
2087 unsigned long flags;
2088
2089 /*
2090 * If the device is in the middle of being closed, then block
2091 * until it's done, and then try again.
2092 */
2093 if (tty_hung_up_p(filp) ||
2094 (info->flags & ASYNC_CLOSING)) {
2095 if (info->flags & ASYNC_CLOSING)
2096 interruptible_sleep_on(&info->close_wait);
2097 #ifdef SERIAL_DO_RESTART
2098 if (info->flags & ASYNC_HUP_NOTIFY)
2099 return -EAGAIN;
2100 else
2101 return -ERESTARTSYS;
2102 #else
2103 return -EAGAIN;
2104 #endif
2105 }
2106
2107 /*
2108 * If non-blocking mode is set, or the port is not enabled,
2109 * then make the check up front and then exit.
2110 */
2111 if ((filp->f_flags & O_NONBLOCK) ||
2112 (tty->flags & (1 << TTY_IO_ERROR))) {
2113 info->flags |= ASYNC_NORMAL_ACTIVE;
2114 return 0;
2115 }
2116
2117 if (tty->termios->c_cflag & CLOCAL)
2118 do_clocal = 1;
2119
2120 /*
2121 * Block waiting for the carrier detect and the line to become
2122 * free (i.e., not in use by the callout). While we are in
2123 * this loop, info->count is dropped by one, so that
2124 * rs_close() knows when to free things. We restore it upon
2125 * exit, either normal or abnormal.
2126 */
2127 retval = 0;
2128 add_wait_queue(&info->open_wait, &wait);
2129 #ifdef SERIAL_DEBUG_OPEN
2130 printk("block_til_ready before block: ttys%d, count = %d\n",
2131 info->line, info->count);
2132 #endif
2133 spin_lock_irqsave(&info->lock, flags);
2134 if (!tty_hung_up_p(filp))
2135 info->count--;
2136 info->blocked_open++;
2137 while (1) {
2138 if ((tty->termios->c_cflag & CBAUD)) {
2139 unsigned int scratch;
2140
2141 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2142 serial_out(info, UART_ESI_CMD2, UART_MCR);
2143 scratch = serial_in(info, UART_ESI_STAT1);
2144 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2145 serial_out(info, UART_ESI_CMD2, UART_MCR);
2146 serial_out(info, UART_ESI_CMD2,
2147 scratch | UART_MCR_DTR | UART_MCR_RTS);
2148 }
2149 set_current_state(TASK_INTERRUPTIBLE);
2150 if (tty_hung_up_p(filp) ||
2151 !(info->flags & ASYNC_INITIALIZED)) {
2152 #ifdef SERIAL_DO_RESTART
2153 if (info->flags & ASYNC_HUP_NOTIFY)
2154 retval = -EAGAIN;
2155 else
2156 retval = -ERESTARTSYS;
2157 #else
2158 retval = -EAGAIN;
2159 #endif
2160 break;
2161 }
2162
2163 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2164 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2165 do_clocal = 1;
2166
2167 if (!(info->flags & ASYNC_CLOSING) &&
2168 (do_clocal))
2169 break;
2170 if (signal_pending(current)) {
2171 retval = -ERESTARTSYS;
2172 break;
2173 }
2174 #ifdef SERIAL_DEBUG_OPEN
2175 printk("block_til_ready blocking: ttys%d, count = %d\n",
2176 info->line, info->count);
2177 #endif
2178 spin_unlock_irqrestore(&info->lock, flags);
2179 schedule();
2180 spin_lock_irqsave(&info->lock, flags);
2181 }
2182 set_current_state(TASK_RUNNING);
2183 remove_wait_queue(&info->open_wait, &wait);
2184 if (!tty_hung_up_p(filp))
2185 info->count++;
2186 info->blocked_open--;
2187 spin_unlock_irqrestore(&info->lock, flags);
2188 #ifdef SERIAL_DEBUG_OPEN
2189 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2190 info->line, info->count);
2191 #endif
2192 if (retval)
2193 return retval;
2194 info->flags |= ASYNC_NORMAL_ACTIVE;
2195 return 0;
2196 }
2197
2198 /*
2199 * This routine is called whenever a serial port is opened. It
2200 * enables interrupts for a serial port, linking in its async structure into
2201 * the IRQ chain. It also performs the serial-specific
2202 * initialization for the tty structure.
2203 */
2204 static int esp_open(struct tty_struct *tty, struct file * filp)
2205 {
2206 struct esp_struct *info;
2207 int retval, line;
2208 unsigned long flags;
2209
2210 line = tty->index;
2211 if ((line < 0) || (line >= NR_PORTS))
2212 return -ENODEV;
2213
2214 /* find the port in the chain */
2215
2216 info = ports;
2217
2218 while (info && (info->line != line))
2219 info = info->next_port;
2220
2221 if (!info) {
2222 serial_paranoia_check(info, tty->name, "esp_open");
2223 return -ENODEV;
2224 }
2225
2226 #ifdef SERIAL_DEBUG_OPEN
2227 printk("esp_open %s, count = %d\n", tty->name, info->count);
2228 #endif
2229 spin_lock_irqsave(&info->lock, flags);
2230 info->count++;
2231 tty->driver_data = info;
2232 info->tty = tty;
2233
2234 spin_unlock_irqrestore(&info->lock, flags);
2235
2236 /*
2237 * Start up serial port
2238 */
2239 retval = startup(info);
2240 if (retval)
2241 return retval;
2242
2243 retval = block_til_ready(tty, filp, info);
2244 if (retval) {
2245 #ifdef SERIAL_DEBUG_OPEN
2246 printk("esp_open returning after block_til_ready with %d\n",
2247 retval);
2248 #endif
2249 return retval;
2250 }
2251
2252 #ifdef SERIAL_DEBUG_OPEN
2253 printk("esp_open %s successful...", tty->name);
2254 #endif
2255 return 0;
2256 }
2257
2258 /*
2259 * ---------------------------------------------------------------------
2260 * espserial_init() and friends
2261 *
2262 * espserial_init() is called at boot-time to initialize the serial driver.
2263 * ---------------------------------------------------------------------
2264 */
2265
2266 /*
2267 * This routine prints out the appropriate serial driver version
2268 * number, and identifies which options were configured into this
2269 * driver.
2270 */
2271
2272 static inline void show_serial_version(void)
2273 {
2274 printk(KERN_INFO "%s version %s (DMA %u)\n",
2275 serial_name, serial_version, dma);
2276 }
2277
2278 /*
2279 * This routine is called by espserial_init() to initialize a specific serial
2280 * port.
2281 */
2282 static inline int autoconfig(struct esp_struct * info)
2283 {
2284 int port_detected = 0;
2285 unsigned long flags;
2286
2287 if (!request_region(info->port, REGION_SIZE, "esp serial"))
2288 return -EIO;
2289
2290 spin_lock_irqsave(&info->lock, flags);
2291 /*
2292 * Check for ESP card
2293 */
2294
2295 if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2296 serial_out(info, UART_ESI_CMD1, 0x00);
2297 serial_out(info, UART_ESI_CMD1, 0x01);
2298
2299 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2300 port_detected = 1;
2301
2302 if (!(info->irq)) {
2303 serial_out(info, UART_ESI_CMD1, 0x02);
2304
2305 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2306 info->irq = 3;
2307 else
2308 info->irq = 4;
2309 }
2310
2311
2312 /* put card in enhanced mode */
2313 /* this prevents access through */
2314 /* the "old" IO ports */
2315 esp_basic_init(info);
2316
2317 /* clear out MCR */
2318 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2319 serial_out(info, UART_ESI_CMD2, UART_MCR);
2320 serial_out(info, UART_ESI_CMD2, 0x00);
2321 }
2322 }
2323 if (!port_detected)
2324 release_region(info->port, REGION_SIZE);
2325
2326 spin_unlock_irqrestore(&info->lock, flags);
2327 return (port_detected);
2328 }
2329
2330 static const struct tty_operations esp_ops = {
2331 .open = esp_open,
2332 .close = rs_close,
2333 .write = rs_write,
2334 .put_char = rs_put_char,
2335 .flush_chars = rs_flush_chars,
2336 .write_room = rs_write_room,
2337 .chars_in_buffer = rs_chars_in_buffer,
2338 .flush_buffer = rs_flush_buffer,
2339 .ioctl = rs_ioctl,
2340 .throttle = rs_throttle,
2341 .unthrottle = rs_unthrottle,
2342 .set_termios = rs_set_termios,
2343 .stop = rs_stop,
2344 .start = rs_start,
2345 .hangup = esp_hangup,
2346 .break_ctl = esp_break,
2347 .wait_until_sent = rs_wait_until_sent,
2348 .tiocmget = esp_tiocmget,
2349 .tiocmset = esp_tiocmset,
2350 };
2351
2352 /*
2353 * The serial driver boot-time initialization code!
2354 */
2355 static int __init espserial_init(void)
2356 {
2357 int i, offset;
2358 struct esp_struct * info;
2359 struct esp_struct *last_primary = NULL;
2360 int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2361
2362 esp_driver = alloc_tty_driver(NR_PORTS);
2363 if (!esp_driver)
2364 return -ENOMEM;
2365
2366 for (i = 0; i < NR_PRIMARY; i++) {
2367 if (irq[i] != 0) {
2368 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2369 (irq[i] == 8) || (irq[i] == 13))
2370 irq[i] = 0;
2371 else if (irq[i] == 2)
2372 irq[i] = 9;
2373 }
2374 }
2375
2376 if ((dma != 1) && (dma != 3))
2377 dma = 0;
2378
2379 if ((rx_trigger < 1) || (rx_trigger > 1023))
2380 rx_trigger = 768;
2381
2382 if ((tx_trigger < 1) || (tx_trigger > 1023))
2383 tx_trigger = 768;
2384
2385 if ((flow_off < 1) || (flow_off > 1023))
2386 flow_off = 1016;
2387
2388 if ((flow_on < 1) || (flow_on > 1023))
2389 flow_on = 944;
2390
2391 if ((rx_timeout < 0) || (rx_timeout > 255))
2392 rx_timeout = 128;
2393
2394 if (flow_on >= flow_off)
2395 flow_on = flow_off - 1;
2396
2397 show_serial_version();
2398
2399 /* Initialize the tty_driver structure */
2400
2401 esp_driver->owner = THIS_MODULE;
2402 esp_driver->name = "ttyP";
2403 esp_driver->major = ESP_IN_MAJOR;
2404 esp_driver->minor_start = 0;
2405 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2406 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2407 esp_driver->init_termios = tty_std_termios;
2408 esp_driver->init_termios.c_cflag =
2409 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2410 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2411 tty_set_operations(esp_driver, &esp_ops);
2412 if (tty_register_driver(esp_driver))
2413 {
2414 printk(KERN_ERR "Couldn't register esp serial driver");
2415 put_tty_driver(esp_driver);
2416 return 1;
2417 }
2418
2419 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
2420
2421 if (!info)
2422 {
2423 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2424 tty_unregister_driver(esp_driver);
2425 put_tty_driver(esp_driver);
2426 return 1;
2427 }
2428
2429 spin_lock_init(&info->lock);
2430 /* rx_trigger, tx_trigger are needed by autoconfig */
2431 info->config.rx_trigger = rx_trigger;
2432 info->config.tx_trigger = tx_trigger;
2433
2434 i = 0;
2435 offset = 0;
2436
2437 do {
2438 info->port = esp[i] + offset;
2439 info->irq = irq[i];
2440 info->line = (i * 8) + (offset / 8);
2441
2442 if (!autoconfig(info)) {
2443 i++;
2444 offset = 0;
2445 continue;
2446 }
2447
2448 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2449 info->flags = STD_COM_FLAGS;
2450 if (info->custom_divisor)
2451 info->flags |= ASYNC_SPD_CUST;
2452 info->magic = ESP_MAGIC;
2453 info->close_delay = 5*HZ/10;
2454 info->closing_wait = 30*HZ;
2455 info->config.rx_timeout = rx_timeout;
2456 info->config.flow_on = flow_on;
2457 info->config.flow_off = flow_off;
2458 info->config.pio_threshold = pio_threshold;
2459 info->next_port = ports;
2460 init_waitqueue_head(&info->open_wait);
2461 init_waitqueue_head(&info->close_wait);
2462 init_waitqueue_head(&info->delta_msr_wait);
2463 init_waitqueue_head(&info->break_wait);
2464 ports = info;
2465 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2466 info->line, info->port, info->irq);
2467
2468 if (info->line % 8) {
2469 printk("secondary port\n");
2470 /* 8 port cards can't do DMA */
2471 info->stat_flags |= ESP_STAT_NEVER_DMA;
2472
2473 if (last_primary)
2474 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2475 } else {
2476 printk("primary port\n");
2477 last_primary = info;
2478 irq[i] = info->irq;
2479 }
2480
2481 if (!dma)
2482 info->stat_flags |= ESP_STAT_NEVER_DMA;
2483
2484 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
2485 if (!info)
2486 {
2487 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2488
2489 /* allow use of the already detected ports */
2490 return 0;
2491 }
2492
2493 spin_lock_init(&info->lock);
2494 /* rx_trigger, tx_trigger are needed by autoconfig */
2495 info->config.rx_trigger = rx_trigger;
2496 info->config.tx_trigger = tx_trigger;
2497
2498 if (offset == 56) {
2499 i++;
2500 offset = 0;
2501 } else {
2502 offset += 8;
2503 }
2504 } while (i < NR_PRIMARY);
2505
2506 /* free the last port memory allocation */
2507 kfree(info);
2508
2509 return 0;
2510 }
2511
2512 static void __exit espserial_exit(void)
2513 {
2514 int e1;
2515 struct esp_struct *temp_async;
2516 struct esp_pio_buffer *pio_buf;
2517
2518 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2519 if ((e1 = tty_unregister_driver(esp_driver)))
2520 printk("SERIAL: failed to unregister serial driver (%d)\n",
2521 e1);
2522 put_tty_driver(esp_driver);
2523
2524 while (ports) {
2525 if (ports->port) {
2526 release_region(ports->port, REGION_SIZE);
2527 }
2528 temp_async = ports->next_port;
2529 kfree(ports);
2530 ports = temp_async;
2531 }
2532
2533 if (dma_buffer)
2534 free_pages((unsigned long)dma_buffer,
2535 get_order(DMA_BUFFER_SZ));
2536
2537 while (free_pio_buf) {
2538 pio_buf = free_pio_buf->next;
2539 kfree(free_pio_buf);
2540 free_pio_buf = pio_buf;
2541 }
2542 }
2543
2544 module_init(espserial_init);
2545 module_exit(espserial_exit);
linux 2.6 git repository for openrd