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x86: PAT avoid aliasing in /dev/mem read/write
[linux-2.6/mini2440.git] / drivers / char / esp.c
blobf3fe620673440e267172e957f174028933beacbc
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 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
1167 if (!info->xmit_buf)
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
1179 static 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 }
1197 out:
1198 spin_unlock_irqrestore(&info->lock, flags);
1199 }
1200
1201 static 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
1211 if (!info->xmit_buf)
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
1253 static 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
1271 static 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
1280 static 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 */
1301 static 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
1324 static 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
1353 static int get_serial_info(struct esp_struct * info,
1354 struct serial_struct __user *retinfo)
1355 {
1356 struct serial_struct tmp;
1357
1358 memset(&tmp, 0, sizeof(tmp));
1359 tmp.type = PORT_16550A;
1360 tmp.line = info->line;
1361 tmp.port = info->port;
1362 tmp.irq = info->irq;
1363 tmp.flags = info->flags;
1364 tmp.xmit_fifo_size = 1024;
1365 tmp.baud_base = BASE_BAUD;
1366 tmp.close_delay = info->close_delay;
1367 tmp.closing_wait = info->closing_wait;
1368 tmp.custom_divisor = info->custom_divisor;
1369 tmp.hub6 = 0;
1370 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1371 return -EFAULT;
1372 return 0;
1373 }
1374
1375 static int get_esp_config(struct esp_struct * info,
1376 struct hayes_esp_config __user *retinfo)
1377 {
1378 struct hayes_esp_config tmp;
1379
1380 if (!retinfo)
1381 return -EFAULT;
1382
1383 memset(&tmp, 0, sizeof(tmp));
1384 tmp.rx_timeout = info->config.rx_timeout;
1385 tmp.rx_trigger = info->config.rx_trigger;
1386 tmp.tx_trigger = info->config.tx_trigger;
1387 tmp.flow_off = info->config.flow_off;
1388 tmp.flow_on = info->config.flow_on;
1389 tmp.pio_threshold = info->config.pio_threshold;
1390 tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1391
1392 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1393 }
1394
1395 static int set_serial_info(struct esp_struct * info,
1396 struct serial_struct __user *new_info)
1397 {
1398 struct serial_struct new_serial;
1399 struct esp_struct old_info;
1400 unsigned int change_irq;
1401 int retval = 0;
1402 struct esp_struct *current_async;
1403
1404 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1405 return -EFAULT;
1406 old_info = *info;
1407
1408 if ((new_serial.type != PORT_16550A) ||
1409 (new_serial.hub6) ||
1410 (info->port != new_serial.port) ||
1411 (new_serial.baud_base != BASE_BAUD) ||
1412 (new_serial.irq > 15) ||
1413 (new_serial.irq < 2) ||
1414 (new_serial.irq == 6) ||
1415 (new_serial.irq == 8) ||
1416 (new_serial.irq == 13))
1417 return -EINVAL;
1418
1419 change_irq = new_serial.irq != info->irq;
1420
1421 if (change_irq && (info->line % 8))
1422 return -EINVAL;
1423
1424 if (!capable(CAP_SYS_ADMIN)) {
1425 if (change_irq ||
1426 (new_serial.close_delay != info->close_delay) ||
1427 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1428 (info->flags & ~ASYNC_USR_MASK)))
1429 return -EPERM;
1430 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1431 (new_serial.flags & ASYNC_USR_MASK));
1432 info->custom_divisor = new_serial.custom_divisor;
1433 } else {
1434 if (new_serial.irq == 2)
1435 new_serial.irq = 9;
1436
1437 if (change_irq) {
1438 current_async = ports;
1439
1440 while (current_async) {
1441 if ((current_async->line >= info->line) &&
1442 (current_async->line < (info->line + 8))) {
1443 if (current_async == info) {
1444 if (current_async->count > 1)
1445 return -EBUSY;
1446 } else if (current_async->count)
1447 return -EBUSY;
1448 }
1449
1450 current_async = current_async->next_port;
1451 }
1452 }
1453
1454 /*
1455 * OK, past this point, all the error checking has been done.
1456 * At this point, we start making changes.....
1457 */
1458
1459 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1460 (new_serial.flags & ASYNC_FLAGS));
1461 info->custom_divisor = new_serial.custom_divisor;
1462 info->close_delay = new_serial.close_delay * HZ/100;
1463 info->closing_wait = new_serial.closing_wait * HZ/100;
1464
1465 if (change_irq) {
1466 /*
1467 * We need to shutdown the serial port at the old
1468 * port/irq combination.
1469 */
1470 shutdown(info);
1471
1472 current_async = ports;
1473
1474 while (current_async) {
1475 if ((current_async->line >= info->line) &&
1476 (current_async->line < (info->line + 8)))
1477 current_async->irq = new_serial.irq;
1478
1479 current_async = current_async->next_port;
1480 }
1481
1482 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1483 if (info->irq == 9)
1484 serial_out(info, UART_ESI_CMD2, 0x02);
1485 else
1486 serial_out(info, UART_ESI_CMD2, info->irq);
1487 }
1488 }
1489
1490 if (info->flags & ASYNC_INITIALIZED) {
1491 if (((old_info.flags & ASYNC_SPD_MASK) !=
1492 (info->flags & ASYNC_SPD_MASK)) ||
1493 (old_info.custom_divisor != info->custom_divisor)) {
1494 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1495 info->tty->alt_speed = 57600;
1496 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1497 info->tty->alt_speed = 115200;
1498 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1499 info->tty->alt_speed = 230400;
1500 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1501 info->tty->alt_speed = 460800;
1502 change_speed(info);
1503 }
1504 } else
1505 retval = startup(info);
1506
1507 return retval;
1508 }
1509
1510 static int set_esp_config(struct esp_struct * info,
1511 struct hayes_esp_config __user * new_info)
1512 {
1513 struct hayes_esp_config new_config;
1514 unsigned int change_dma;
1515 int retval = 0;
1516 struct esp_struct *current_async;
1517 unsigned long flags;
1518
1519 /* Perhaps a non-sysadmin user should be able to do some of these */
1520 /* operations. I haven't decided yet. */
1521
1522 if (!capable(CAP_SYS_ADMIN))
1523 return -EPERM;
1524
1525 if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1526 return -EFAULT;
1527
1528 if ((new_config.flow_on >= new_config.flow_off) ||
1529 (new_config.rx_trigger < 1) ||
1530 (new_config.tx_trigger < 1) ||
1531 (new_config.flow_off < 1) ||
1532 (new_config.flow_on < 1) ||
1533 (new_config.rx_trigger > 1023) ||
1534 (new_config.tx_trigger > 1023) ||
1535 (new_config.flow_off > 1023) ||
1536 (new_config.flow_on > 1023) ||
1537 (new_config.pio_threshold < 0) ||
1538 (new_config.pio_threshold > 1024))
1539 return -EINVAL;
1540
1541 if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1542 new_config.dma_channel = 0;
1543
1544 if (info->stat_flags & ESP_STAT_NEVER_DMA)
1545 change_dma = new_config.dma_channel;
1546 else
1547 change_dma = (new_config.dma_channel != dma);
1548
1549 if (change_dma) {
1550 if (new_config.dma_channel) {
1551 /* PIO mode to DMA mode transition OR */
1552 /* change current DMA channel */
1553
1554 current_async = ports;
1555
1556 while (current_async) {
1557 if (current_async == info) {
1558 if (current_async->count > 1)
1559 return -EBUSY;
1560 } else if (current_async->count)
1561 return -EBUSY;
1562
1563 current_async =
1564 current_async->next_port;
1565 }
1566
1567 shutdown(info);
1568 dma = new_config.dma_channel;
1569 info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1570
1571 /* all ports must use the same DMA channel */
1572
1573 spin_lock_irqsave(&info->lock, flags);
1574 current_async = ports;
1575
1576 while (current_async) {
1577 esp_basic_init(current_async);
1578 current_async = current_async->next_port;
1579 }
1580 spin_unlock_irqrestore(&info->lock, flags);
1581 } else {
1582 /* DMA mode to PIO mode only */
1583
1584 if (info->count > 1)
1585 return -EBUSY;
1586
1587 shutdown(info);
1588 spin_lock_irqsave(&info->lock, flags);
1589 info->stat_flags |= ESP_STAT_NEVER_DMA;
1590 esp_basic_init(info);
1591 spin_unlock_irqrestore(&info->lock, flags);
1592 }
1593 }
1594
1595 info->config.pio_threshold = new_config.pio_threshold;
1596
1597 if ((new_config.flow_off != info->config.flow_off) ||
1598 (new_config.flow_on != info->config.flow_on)) {
1599 unsigned long flags;
1600
1601 info->config.flow_off = new_config.flow_off;
1602 info->config.flow_on = new_config.flow_on;
1603
1604 spin_lock_irqsave(&info->lock, flags);
1605 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1606 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1607 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1608 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1609 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1610 spin_unlock_irqrestore(&info->lock, flags);
1611 }
1612
1613 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1614 (new_config.tx_trigger != info->config.tx_trigger)) {
1615 unsigned long flags;
1616
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) {
1631 unsigned long flags;
1632
1633 info->config.rx_timeout = new_config.rx_timeout;
1634 spin_lock_irqsave(&info->lock, flags);
1635
1636 if (info->IER & UART_IER_RDI) {
1637 serial_out(info, UART_ESI_CMD1,
1638 ESI_SET_RX_TIMEOUT);
1639 serial_out(info, UART_ESI_CMD2,
1640 new_config.rx_timeout);
1641 }
1642
1643 spin_unlock_irqrestore(&info->lock, flags);
1644 }
1645
1646 if (!(info->flags & ASYNC_INITIALIZED))
1647 retval = startup(info);
1648
1649 return retval;
1650 }
1651
1652 /*
1653 * get_lsr_info - get line status register info
1654 *
1655 * Purpose: Let user call ioctl() to get info when the UART physically
1656 * is emptied. On bus types like RS485, the transmitter must
1657 * release the bus after transmitting. This must be done when
1658 * the transmit shift register is empty, not be done when the
1659 * transmit holding register is empty. This functionality
1660 * allows an RS485 driver to be written in user space.
1661 */
1662 static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1663 {
1664 unsigned char status;
1665 unsigned int result;
1666 unsigned long flags;
1667
1668 spin_lock_irqsave(&info->lock, flags);
1669 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1670 status = serial_in(info, UART_ESI_STAT1);
1671 spin_unlock_irqrestore(&info->lock, flags);
1672 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1673 return put_user(result,value);
1674 }
1675
1676
1677 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1678 {
1679 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1680 unsigned char control, status;
1681 unsigned long flags;
1682
1683 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1684 return -ENODEV;
1685 if (tty->flags & (1 << TTY_IO_ERROR))
1686 return -EIO;
1687
1688 control = info->MCR;
1689
1690 spin_lock_irqsave(&info->lock, flags);
1691 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1692 status = serial_in(info, UART_ESI_STAT2);
1693 spin_unlock_irqrestore(&info->lock, flags);
1694
1695 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1696 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1697 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1698 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1699 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1700 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1701 }
1702
1703 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1704 unsigned int set, unsigned int clear)
1705 {
1706 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1707 unsigned long flags;
1708
1709 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1710 return -ENODEV;
1711 if (tty->flags & (1 << TTY_IO_ERROR))
1712 return -EIO;
1713
1714 spin_lock_irqsave(&info->lock, flags);
1715
1716 if (set & TIOCM_RTS)
1717 info->MCR |= UART_MCR_RTS;
1718 if (set & TIOCM_DTR)
1719 info->MCR |= UART_MCR_DTR;
1720
1721 if (clear & TIOCM_RTS)
1722 info->MCR &= ~UART_MCR_RTS;
1723 if (clear & TIOCM_DTR)
1724 info->MCR &= ~UART_MCR_DTR;
1725
1726 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1727 serial_out(info, UART_ESI_CMD2, UART_MCR);
1728 serial_out(info, UART_ESI_CMD2, info->MCR);
1729
1730 spin_unlock_irqrestore(&info->lock, flags);
1731 return 0;
1732 }
1733
1734 /*
1735 * rs_break() --- routine which turns the break handling on or off
1736 */
1737 static void esp_break(struct tty_struct *tty, int break_state)
1738 {
1739 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1740 unsigned long flags;
1741
1742 if (serial_paranoia_check(info, tty->name, "esp_break"))
1743 return;
1744
1745 if (break_state == -1) {
1746 spin_lock_irqsave(&info->lock, flags);
1747 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1748 serial_out(info, UART_ESI_CMD2, 0x01);
1749 spin_unlock_irqrestore(&info->lock, flags);
1750
1751 /* FIXME - new style wait needed here */
1752 interruptible_sleep_on(&info->break_wait);
1753 } else {
1754 spin_lock_irqsave(&info->lock, flags);
1755 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1756 serial_out(info, UART_ESI_CMD2, 0x00);
1757 spin_unlock_irqrestore(&info->lock, flags);
1758 }
1759 }
1760
1761 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1762 unsigned int cmd, unsigned long arg)
1763 {
1764 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1765 struct async_icount cprev, cnow; /* kernel counter temps */
1766 struct serial_icounter_struct __user *p_cuser; /* user space */
1767 void __user *argp = (void __user *)arg;
1768 unsigned long flags;
1769
1770 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1771 return -ENODEV;
1772
1773 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1774 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1775 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1776 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1777 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1778 if (tty->flags & (1 << TTY_IO_ERROR))
1779 return -EIO;
1780 }
1781
1782 switch (cmd) {
1783 case TIOCGSERIAL:
1784 return get_serial_info(info, argp);
1785 case TIOCSSERIAL:
1786 return set_serial_info(info, argp);
1787 case TIOCSERCONFIG:
1788 /* do not reconfigure after initial configuration */
1789 return 0;
1790
1791 case TIOCSERGWILD:
1792 return put_user(0L, (unsigned long __user *)argp);
1793
1794 case TIOCSERGETLSR: /* Get line status register */
1795 return get_lsr_info(info, argp);
1796
1797 case TIOCSERSWILD:
1798 if (!capable(CAP_SYS_ADMIN))
1799 return -EPERM;
1800 return 0;
1801
1802 /*
1803 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1804 * - mask passed in arg for lines of interest
1805 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1806 * Caller should use TIOCGICOUNT to see which one it was
1807 */
1808 case TIOCMIWAIT:
1809 spin_lock_irqsave(&info->lock, flags);
1810 cprev = info->icount; /* note the counters on entry */
1811 spin_unlock_irqrestore(&info->lock, flags);
1812 while (1) {
1813 /* FIXME: convert to new style wakeup */
1814 interruptible_sleep_on(&info->delta_msr_wait);
1815 /* see if a signal did it */
1816 if (signal_pending(current))
1817 return -ERESTARTSYS;
1818 spin_lock_irqsave(&info->lock, flags);
1819 cnow = info->icount; /* atomic copy */
1820 spin_unlock_irqrestore(&info->lock, flags);
1821 if (cnow.rng == cprev.rng &&
1822 cnow.dsr == cprev.dsr &&
1823 cnow.dcd == cprev.dcd &&
1824 cnow.cts == cprev.cts)
1825 return -EIO; /* no change => error */
1826 if (((arg & TIOCM_RNG) &&
1827 (cnow.rng != cprev.rng)) ||
1828 ((arg & TIOCM_DSR) &&
1829 (cnow.dsr != cprev.dsr)) ||
1830 ((arg & TIOCM_CD) &&
1831 (cnow.dcd != cprev.dcd)) ||
1832 ((arg & TIOCM_CTS) &&
1833 (cnow.cts != cprev.cts)) ) {
1834 return 0;
1835 }
1836 cprev = cnow;
1837 }
1838 /* NOTREACHED */
1839
1840 /*
1841 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1842 * Return: write counters to the user passed counter struct
1843 * NB: both 1->0 and 0->1 transitions are counted except for
1844 * RI where only 0->1 is counted.
1845 */
1846 case TIOCGICOUNT:
1847 spin_lock_irqsave(&info->lock, flags);
1848 cnow = info->icount;
1849 spin_unlock_irqrestore(&info->lock, flags);
1850 p_cuser = argp;
1851 if (put_user(cnow.cts, &p_cuser->cts) ||
1852 put_user(cnow.dsr, &p_cuser->dsr) ||
1853 put_user(cnow.rng, &p_cuser->rng) ||
1854 put_user(cnow.dcd, &p_cuser->dcd))
1855 return -EFAULT;
1856
1857 return 0;
1858 case TIOCGHAYESESP:
1859 return get_esp_config(info, argp);
1860 case TIOCSHAYESESP:
1861 return set_esp_config(info, argp);
1862
1863 default:
1864 return -ENOIOCTLCMD;
1865 }
1866 return 0;
1867 }
1868
1869 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1870 {
1871 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1872 unsigned long flags;
1873
1874 change_speed(info);
1875
1876 spin_lock_irqsave(&info->lock, flags);
1877
1878 /* Handle transition to B0 status */
1879 if ((old_termios->c_cflag & CBAUD) &&
1880 !(tty->termios->c_cflag & CBAUD)) {
1881 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1882 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1883 serial_out(info, UART_ESI_CMD2, UART_MCR);
1884 serial_out(info, UART_ESI_CMD2, info->MCR);
1885 }
1886
1887 /* Handle transition away from B0 status */
1888 if (!(old_termios->c_cflag & CBAUD) &&
1889 (tty->termios->c_cflag & CBAUD)) {
1890 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1891 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1892 serial_out(info, UART_ESI_CMD2, UART_MCR);
1893 serial_out(info, UART_ESI_CMD2, info->MCR);
1894 }
1895
1896 spin_unlock_irqrestore(&info->lock, flags);
1897
1898 /* Handle turning of CRTSCTS */
1899 if ((old_termios->c_cflag & CRTSCTS) &&
1900 !(tty->termios->c_cflag & CRTSCTS)) {
1901 rs_start(tty);
1902 }
1903 }
1904
1905 /*
1906 * ------------------------------------------------------------
1907 * rs_close()
1908 *
1909 * This routine is called when the serial port gets closed. First, we
1910 * wait for the last remaining data to be sent. Then, we unlink its
1911 * async structure from the interrupt chain if necessary, and we free
1912 * that IRQ if nothing is left in the chain.
1913 * ------------------------------------------------------------
1914 */
1915 static void rs_close(struct tty_struct *tty, struct file * filp)
1916 {
1917 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1918 unsigned long flags;
1919
1920 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1921 return;
1922
1923 spin_lock_irqsave(&info->lock, flags);
1924
1925 if (tty_hung_up_p(filp)) {
1926 DBG_CNT("before DEC-hung");
1927 goto out;
1928 }
1929
1930 #ifdef SERIAL_DEBUG_OPEN
1931 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1932 #endif
1933 if ((tty->count == 1) && (info->count != 1)) {
1934 /*
1935 * Uh, oh. tty->count is 1, which means that the tty
1936 * structure will be freed. Info->count should always
1937 * be one in these conditions. If it's greater than
1938 * one, we've got real problems, since it means the
1939 * serial port won't be shutdown.
1940 */
1941 printk("rs_close: bad serial port count; tty->count is 1, "
1942 "info->count is %d\n", info->count);
1943 info->count = 1;
1944 }
1945 if (--info->count < 0) {
1946 printk("rs_close: bad serial port count for ttys%d: %d\n",
1947 info->line, info->count);
1948 info->count = 0;
1949 }
1950 if (info->count) {
1951 DBG_CNT("before DEC-2");
1952 goto out;
1953 }
1954 info->flags |= ASYNC_CLOSING;
1955
1956 spin_unlock_irqrestore(&info->lock, flags);
1957 /*
1958 * Now we wait for the transmit buffer to clear; and we notify
1959 * the line discipline to only process XON/XOFF characters.
1960 */
1961 tty->closing = 1;
1962 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1963 tty_wait_until_sent(tty, info->closing_wait);
1964 /*
1965 * At this point we stop accepting input. To do this, we
1966 * disable the receive line status interrupts, and tell the
1967 * interrupt driver to stop checking the data ready bit in the
1968 * line status register.
1969 */
1970 /* info->IER &= ~UART_IER_RLSI; */
1971 info->IER &= ~UART_IER_RDI;
1972 info->read_status_mask &= ~UART_LSR_DR;
1973 if (info->flags & ASYNC_INITIALIZED) {
1974
1975 spin_lock_irqsave(&info->lock, flags);
1976 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1977 serial_out(info, UART_ESI_CMD2, info->IER);
1978
1979 /* disable receive timeout */
1980 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1981 serial_out(info, UART_ESI_CMD2, 0x00);
1982
1983 spin_unlock_irqrestore(&info->lock, flags);
1984
1985 /*
1986 * Before we drop DTR, make sure the UART transmitter
1987 * has completely drained; this is especially
1988 * important if there is a transmit FIFO!
1989 */
1990 rs_wait_until_sent(tty, info->timeout);
1991 }
1992 shutdown(info);
1993 if (tty->driver->flush_buffer)
1994 tty->driver->flush_buffer(tty);
1995 tty_ldisc_flush(tty);
1996 tty->closing = 0;
1997 info->tty = NULL;
1998
1999 if (info->blocked_open) {
2000 if (info->close_delay) {
2001 msleep_interruptible(jiffies_to_msecs(info->close_delay));
2002 }
2003 wake_up_interruptible(&info->open_wait);
2004 }
2005 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2006 wake_up_interruptible(&info->close_wait);
2007 return;
2008
2009 out:
2010 spin_unlock_irqrestore(&info->lock, flags);
2011 }
2012
2013 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2014 {
2015 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2016 unsigned long orig_jiffies, char_time;
2017 unsigned long flags;
2018
2019 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2020 return;
2021
2022 orig_jiffies = jiffies;
2023 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2024
2025 if (!char_time)
2026 char_time = 1;
2027
2028 spin_lock_irqsave(&info->lock, flags);
2029 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2030 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2031
2032 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2033 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2034
2035 spin_unlock_irqrestore(&info->lock, flags);
2036 msleep_interruptible(jiffies_to_msecs(char_time));
2037
2038 if (signal_pending(current))
2039 break;
2040
2041 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2042 break;
2043
2044 spin_lock_irqsave(&info->lock, flags);
2045 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2046 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2047 }
2048 spin_unlock_irqrestore(&info->lock, flags);
2049 set_current_state(TASK_RUNNING);
2050 }
2051
2052 /*
2053 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2054 */
2055 static void esp_hangup(struct tty_struct *tty)
2056 {
2057 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2058
2059 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2060 return;
2061
2062 rs_flush_buffer(tty);
2063 shutdown(info);
2064 info->count = 0;
2065 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2066 info->tty = NULL;
2067 wake_up_interruptible(&info->open_wait);
2068 }
2069
2070 /*
2071 * ------------------------------------------------------------
2072 * esp_open() and friends
2073 * ------------------------------------------------------------
2074 */
2075 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2076 struct esp_struct *info)
2077 {
2078 DECLARE_WAITQUEUE(wait, current);
2079 int retval;
2080 int do_clocal = 0;
2081 unsigned long flags;
2082
2083 /*
2084 * If the device is in the middle of being closed, then block
2085 * until it's done, and then try again.
2086 */
2087 if (tty_hung_up_p(filp) ||
2088 (info->flags & ASYNC_CLOSING)) {
2089 if (info->flags & ASYNC_CLOSING)
2090 interruptible_sleep_on(&info->close_wait);
2091 #ifdef SERIAL_DO_RESTART
2092 if (info->flags & ASYNC_HUP_NOTIFY)
2093 return -EAGAIN;
2094 else
2095 return -ERESTARTSYS;
2096 #else
2097 return -EAGAIN;
2098 #endif
2099 }
2100
2101 /*
2102 * If non-blocking mode is set, or the port is not enabled,
2103 * then make the check up front and then exit.
2104 */
2105 if ((filp->f_flags & O_NONBLOCK) ||
2106 (tty->flags & (1 << TTY_IO_ERROR))) {
2107 info->flags |= ASYNC_NORMAL_ACTIVE;
2108 return 0;
2109 }
2110
2111 if (tty->termios->c_cflag & CLOCAL)
2112 do_clocal = 1;
2113
2114 /*
2115 * Block waiting for the carrier detect and the line to become
2116 * free (i.e., not in use by the callout). While we are in
2117 * this loop, info->count is dropped by one, so that
2118 * rs_close() knows when to free things. We restore it upon
2119 * exit, either normal or abnormal.
2120 */
2121 retval = 0;
2122 add_wait_queue(&info->open_wait, &wait);
2123 #ifdef SERIAL_DEBUG_OPEN
2124 printk("block_til_ready before block: ttys%d, count = %d\n",
2125 info->line, info->count);
2126 #endif
2127 spin_lock_irqsave(&info->lock, flags);
2128 if (!tty_hung_up_p(filp))
2129 info->count--;
2130 info->blocked_open++;
2131 while (1) {
2132 if ((tty->termios->c_cflag & CBAUD)) {
2133 unsigned int scratch;
2134
2135 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2136 serial_out(info, UART_ESI_CMD2, UART_MCR);
2137 scratch = serial_in(info, UART_ESI_STAT1);
2138 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2139 serial_out(info, UART_ESI_CMD2, UART_MCR);
2140 serial_out(info, UART_ESI_CMD2,
2141 scratch | UART_MCR_DTR | UART_MCR_RTS);
2142 }
2143 set_current_state(TASK_INTERRUPTIBLE);
2144 if (tty_hung_up_p(filp) ||
2145 !(info->flags & ASYNC_INITIALIZED)) {
2146 #ifdef SERIAL_DO_RESTART
2147 if (info->flags & ASYNC_HUP_NOTIFY)
2148 retval = -EAGAIN;
2149 else
2150 retval = -ERESTARTSYS;
2151 #else
2152 retval = -EAGAIN;
2153 #endif
2154 break;
2155 }
2156
2157 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2158 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2159 do_clocal = 1;
2160
2161 if (!(info->flags & ASYNC_CLOSING) &&
2162 (do_clocal))
2163 break;
2164 if (signal_pending(current)) {
2165 retval = -ERESTARTSYS;
2166 break;
2167 }
2168 #ifdef SERIAL_DEBUG_OPEN
2169 printk("block_til_ready blocking: ttys%d, count = %d\n",
2170 info->line, info->count);
2171 #endif
2172 spin_unlock_irqrestore(&info->lock, flags);
2173 schedule();
2174 spin_lock_irqsave(&info->lock, flags);
2175 }
2176 set_current_state(TASK_RUNNING);
2177 remove_wait_queue(&info->open_wait, &wait);
2178 if (!tty_hung_up_p(filp))
2179 info->count++;
2180 info->blocked_open--;
2181 spin_unlock_irqrestore(&info->lock, flags);
2182 #ifdef SERIAL_DEBUG_OPEN
2183 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2184 info->line, info->count);
2185 #endif
2186 if (retval)
2187 return retval;
2188 info->flags |= ASYNC_NORMAL_ACTIVE;
2189 return 0;
2190 }
2191
2192 /*
2193 * This routine is called whenever a serial port is opened. It
2194 * enables interrupts for a serial port, linking in its async structure into
2195 * the IRQ chain. It also performs the serial-specific
2196 * initialization for the tty structure.
2197 */
2198 static int esp_open(struct tty_struct *tty, struct file * filp)
2199 {
2200 struct esp_struct *info;
2201 int retval, line;
2202 unsigned long flags;
2203
2204 line = tty->index;
2205 if ((line < 0) || (line >= NR_PORTS))
2206 return -ENODEV;
2207
2208 /* find the port in the chain */
2209
2210 info = ports;
2211
2212 while (info && (info->line != line))
2213 info = info->next_port;
2214
2215 if (!info) {
2216 serial_paranoia_check(info, tty->name, "esp_open");
2217 return -ENODEV;
2218 }
2219
2220 #ifdef SERIAL_DEBUG_OPEN
2221 printk("esp_open %s, count = %d\n", tty->name, info->count);
2222 #endif
2223 spin_lock_irqsave(&info->lock, flags);
2224 info->count++;
2225 tty->driver_data = info;
2226 info->tty = tty;
2227
2228 spin_unlock_irqrestore(&info->lock, flags);
2229
2230 /*
2231 * Start up serial port
2232 */
2233 retval = startup(info);
2234 if (retval)
2235 return retval;
2236
2237 retval = block_til_ready(tty, filp, info);
2238 if (retval) {
2239 #ifdef SERIAL_DEBUG_OPEN
2240 printk("esp_open returning after block_til_ready with %d\n",
2241 retval);
2242 #endif
2243 return retval;
2244 }
2245
2246 #ifdef SERIAL_DEBUG_OPEN
2247 printk("esp_open %s successful...", tty->name);
2248 #endif
2249 return 0;
2250 }
2251
2252 /*
2253 * ---------------------------------------------------------------------
2254 * espserial_init() and friends
2255 *
2256 * espserial_init() is called at boot-time to initialize the serial driver.
2257 * ---------------------------------------------------------------------
2258 */
2259
2260 /*
2261 * This routine prints out the appropriate serial driver version
2262 * number, and identifies which options were configured into this
2263 * driver.
2264 */
2265
2266 static inline void show_serial_version(void)
2267 {
2268 printk(KERN_INFO "%s version %s (DMA %u)\n",
2269 serial_name, serial_version, dma);
2270 }
2271
2272 /*
2273 * This routine is called by espserial_init() to initialize a specific serial
2274 * port.
2275 */
2276 static inline int autoconfig(struct esp_struct * info)
2277 {
2278 int port_detected = 0;
2279 unsigned long flags;
2280
2281 if (!request_region(info->port, REGION_SIZE, "esp serial"))
2282 return -EIO;
2283
2284 spin_lock_irqsave(&info->lock, flags);
2285 /*
2286 * Check for ESP card
2287 */
2288
2289 if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2290 serial_out(info, UART_ESI_CMD1, 0x00);
2291 serial_out(info, UART_ESI_CMD1, 0x01);
2292
2293 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2294 port_detected = 1;
2295
2296 if (!(info->irq)) {
2297 serial_out(info, UART_ESI_CMD1, 0x02);
2298
2299 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2300 info->irq = 3;
2301 else
2302 info->irq = 4;
2303 }
2304
2305
2306 /* put card in enhanced mode */
2307 /* this prevents access through */
2308 /* the "old" IO ports */
2309 esp_basic_init(info);
2310
2311 /* clear out MCR */
2312 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2313 serial_out(info, UART_ESI_CMD2, UART_MCR);
2314 serial_out(info, UART_ESI_CMD2, 0x00);
2315 }
2316 }
2317 if (!port_detected)
2318 release_region(info->port, REGION_SIZE);
2319
2320 spin_unlock_irqrestore(&info->lock, flags);
2321 return (port_detected);
2322 }
2323
2324 static const struct tty_operations esp_ops = {
2325 .open = esp_open,
2326 .close = rs_close,
2327 .write = rs_write,
2328 .put_char = rs_put_char,
2329 .flush_chars = rs_flush_chars,
2330 .write_room = rs_write_room,
2331 .chars_in_buffer = rs_chars_in_buffer,
2332 .flush_buffer = rs_flush_buffer,
2333 .ioctl = rs_ioctl,
2334 .throttle = rs_throttle,
2335 .unthrottle = rs_unthrottle,
2336 .set_termios = rs_set_termios,
2337 .stop = rs_stop,
2338 .start = rs_start,
2339 .hangup = esp_hangup,
2340 .break_ctl = esp_break,
2341 .wait_until_sent = rs_wait_until_sent,
2342 .tiocmget = esp_tiocmget,
2343 .tiocmset = esp_tiocmset,
2344 };
2345
2346 /*
2347 * The serial driver boot-time initialization code!
2348 */
2349 static int __init espserial_init(void)
2350 {
2351 int i, offset;
2352 struct esp_struct * info;
2353 struct esp_struct *last_primary = NULL;
2354 int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2355
2356 esp_driver = alloc_tty_driver(NR_PORTS);
2357 if (!esp_driver)
2358 return -ENOMEM;
2359
2360 for (i = 0; i < NR_PRIMARY; i++) {
2361 if (irq[i] != 0) {
2362 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2363 (irq[i] == 8) || (irq[i] == 13))
2364 irq[i] = 0;
2365 else if (irq[i] == 2)
2366 irq[i] = 9;
2367 }
2368 }
2369
2370 if ((dma != 1) && (dma != 3))
2371 dma = 0;
2372
2373 if ((rx_trigger < 1) || (rx_trigger > 1023))
2374 rx_trigger = 768;
2375
2376 if ((tx_trigger < 1) || (tx_trigger > 1023))
2377 tx_trigger = 768;
2378
2379 if ((flow_off < 1) || (flow_off > 1023))
2380 flow_off = 1016;
2381
2382 if ((flow_on < 1) || (flow_on > 1023))
2383 flow_on = 944;
2384
2385 if ((rx_timeout < 0) || (rx_timeout > 255))
2386 rx_timeout = 128;
2387
2388 if (flow_on >= flow_off)
2389 flow_on = flow_off - 1;
2390
2391 show_serial_version();
2392
2393 /* Initialize the tty_driver structure */
2394
2395 esp_driver->owner = THIS_MODULE;
2396 esp_driver->name = "ttyP";
2397 esp_driver->major = ESP_IN_MAJOR;
2398 esp_driver->minor_start = 0;
2399 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2400 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2401 esp_driver->init_termios = tty_std_termios;
2402 esp_driver->init_termios.c_cflag =
2403 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2404 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2405 tty_set_operations(esp_driver, &esp_ops);
2406 if (tty_register_driver(esp_driver))
2407 {
2408 printk(KERN_ERR "Couldn't register esp serial driver");
2409 put_tty_driver(esp_driver);
2410 return 1;
2411 }
2412
2413 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
2414
2415 if (!info)
2416 {
2417 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2418 tty_unregister_driver(esp_driver);
2419 put_tty_driver(esp_driver);
2420 return 1;
2421 }
2422
2423 spin_lock_init(&info->lock);
2424 /* rx_trigger, tx_trigger are needed by autoconfig */
2425 info->config.rx_trigger = rx_trigger;
2426 info->config.tx_trigger = tx_trigger;
2427
2428 i = 0;
2429 offset = 0;
2430
2431 do {
2432 info->port = esp[i] + offset;
2433 info->irq = irq[i];
2434 info->line = (i * 8) + (offset / 8);
2435
2436 if (!autoconfig(info)) {
2437 i++;
2438 offset = 0;
2439 continue;
2440 }
2441
2442 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2443 info->flags = STD_COM_FLAGS;
2444 if (info->custom_divisor)
2445 info->flags |= ASYNC_SPD_CUST;
2446 info->magic = ESP_MAGIC;
2447 info->close_delay = 5*HZ/10;
2448 info->closing_wait = 30*HZ;
2449 info->config.rx_timeout = rx_timeout;
2450 info->config.flow_on = flow_on;
2451 info->config.flow_off = flow_off;
2452 info->config.pio_threshold = pio_threshold;
2453 info->next_port = ports;
2454 init_waitqueue_head(&info->open_wait);
2455 init_waitqueue_head(&info->close_wait);
2456 init_waitqueue_head(&info->delta_msr_wait);
2457 init_waitqueue_head(&info->break_wait);
2458 ports = info;
2459 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2460 info->line, info->port, info->irq);
2461
2462 if (info->line % 8) {
2463 printk("secondary port\n");
2464 /* 8 port cards can't do DMA */
2465 info->stat_flags |= ESP_STAT_NEVER_DMA;
2466
2467 if (last_primary)
2468 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2469 } else {
2470 printk("primary port\n");
2471 last_primary = info;
2472 irq[i] = info->irq;
2473 }
2474
2475 if (!dma)
2476 info->stat_flags |= ESP_STAT_NEVER_DMA;
2477
2478 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
2479 if (!info)
2480 {
2481 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2482
2483 /* allow use of the already detected ports */
2484 return 0;
2485 }
2486
2487 spin_lock_init(&info->lock);
2488 /* rx_trigger, tx_trigger are needed by autoconfig */
2489 info->config.rx_trigger = rx_trigger;
2490 info->config.tx_trigger = tx_trigger;
2491
2492 if (offset == 56) {
2493 i++;
2494 offset = 0;
2495 } else {
2496 offset += 8;
2497 }
2498 } while (i < NR_PRIMARY);
2499
2500 /* free the last port memory allocation */
2501 kfree(info);
2502
2503 return 0;
2504 }
2505
2506 static void __exit espserial_exit(void)
2507 {
2508 int e1;
2509 struct esp_struct *temp_async;
2510 struct esp_pio_buffer *pio_buf;
2511
2512 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2513 if ((e1 = tty_unregister_driver(esp_driver)))
2514 printk("SERIAL: failed to unregister serial driver (%d)\n",
2515 e1);
2516 put_tty_driver(esp_driver);
2517
2518 while (ports) {
2519 if (ports->port) {
2520 release_region(ports->port, REGION_SIZE);
2521 }
2522 temp_async = ports->next_port;
2523 kfree(ports);
2524 ports = temp_async;
2525 }
2526
2527 if (dma_buffer)
2528 free_pages((unsigned long)dma_buffer,
2529 get_order(DMA_BUFFER_SZ));
2530
2531 while (free_pio_buf) {
2532 pio_buf = free_pio_buf->next;
2533 kfree(free_pio_buf);
2534 free_pio_buf = pio_buf;
2535 }
2536 }
2537
2538 module_init(espserial_init);
2539 module_exit(espserial_exit);
Support for the Chinese Samsung S3C2440 based development boards