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dm: introduce merge_bvec_fn
[linux-2.6/mini2440.git] / drivers / char / esp.c
blob84840ba13ff05e584f78e3ca252eb0d74db10dd1
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 <linux/io.h>
65
66 #include <asm/dma.h>
67 #include <linux/slab.h>
68 #include <linux/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(KERN_DEBUG "(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
131 tty->name, info->flags, \
132 serial_driver.refcount, \
133 info->count, tty->count, s)
134 #else
135 #define DBG_CNT(s)
136 #endif
137
138 static struct esp_struct *ports;
139
140 static void change_speed(struct esp_struct *info);
141 static void rs_wait_until_sent(struct tty_struct *, int);
142
143 /*
144 * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
145 * times the normal 1.8432 Mhz clock of most serial boards).
146 */
147 #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
148
149 /* Standard COM flags (except for COM4, because of the 8514 problem) */
150 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
151
152 static inline int serial_paranoia_check(struct esp_struct *info,
153 char *name, const char *routine)
154 {
155 #ifdef SERIAL_PARANOIA_CHECK
156 static const char badmagic[] = KERN_WARNING
157 "Warning: bad magic number for serial struct (%s) in %s\n";
158 static const char badinfo[] = KERN_WARNING
159 "Warning: null esp_struct for (%s) in %s\n";
160
161 if (!info) {
162 printk(badinfo, name, routine);
163 return 1;
164 }
165 if (info->magic != ESP_MAGIC) {
166 printk(badmagic, name, routine);
167 return 1;
168 }
169 #endif
170 return 0;
171 }
172
173 static inline unsigned int serial_in(struct esp_struct *info, int offset)
174 {
175 return inb(info->port + offset);
176 }
177
178 static inline void serial_out(struct esp_struct *info, int offset,
179 unsigned char value)
180 {
181 outb(value, info->port+offset);
182 }
183
184 /*
185 * ------------------------------------------------------------
186 * rs_stop() and rs_start()
187 *
188 * This routines are called before setting or resetting tty->stopped.
189 * They enable or disable transmitter interrupts, as necessary.
190 * ------------------------------------------------------------
191 */
192 static void rs_stop(struct tty_struct *tty)
193 {
194 struct esp_struct *info = tty->driver_data;
195 unsigned long flags;
196
197 if (serial_paranoia_check(info, tty->name, "rs_stop"))
198 return;
199
200 spin_lock_irqsave(&info->lock, flags);
201 if (info->IER & UART_IER_THRI) {
202 info->IER &= ~UART_IER_THRI;
203 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
204 serial_out(info, UART_ESI_CMD2, info->IER);
205 }
206 spin_unlock_irqrestore(&info->lock, flags);
207 }
208
209 static void rs_start(struct tty_struct *tty)
210 {
211 struct esp_struct *info = tty->driver_data;
212 unsigned long flags;
213
214 if (serial_paranoia_check(info, tty->name, "rs_start"))
215 return;
216
217 spin_lock_irqsave(&info->lock, flags);
218 if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
219 info->IER |= UART_IER_THRI;
220 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
221 serial_out(info, UART_ESI_CMD2, info->IER);
222 }
223 spin_unlock_irqrestore(&info->lock, flags);
224 }
225
226 /*
227 * ----------------------------------------------------------------------
228 *
229 * Here starts the interrupt handling routines. All of the following
230 * subroutines are declared as inline and are folded into
231 * rs_interrupt(). They were separated out for readability's sake.
232 *
233 * Note: rs_interrupt() is a "fast" interrupt, which means that it
234 * runs with interrupts turned off. People who may want to modify
235 * rs_interrupt() should try to keep the interrupt handler as fast as
236 * possible. After you are done making modifications, it is not a bad
237 * idea to do:
238 *
239 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
240 *
241 * and look at the resulting assemble code in serial.s.
242 *
243 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
244 * -----------------------------------------------------------------------
245 */
246
247 static DEFINE_SPINLOCK(pio_lock);
248
249 static inline struct esp_pio_buffer *get_pio_buffer(void)
250 {
251 struct esp_pio_buffer *buf;
252 unsigned long flags;
253
254 spin_lock_irqsave(&pio_lock, flags);
255 if (free_pio_buf) {
256 buf = free_pio_buf;
257 free_pio_buf = buf->next;
258 } else {
259 buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
260 }
261 spin_unlock_irqrestore(&pio_lock, flags);
262 return buf;
263 }
264
265 static inline void release_pio_buffer(struct esp_pio_buffer *buf)
266 {
267 unsigned long flags;
268 spin_lock_irqsave(&pio_lock, flags);
269 buf->next = free_pio_buf;
270 free_pio_buf = buf;
271 spin_unlock_irqrestore(&pio_lock, flags);
272 }
273
274 static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
275 {
276 struct tty_struct *tty = info->tty;
277 int i;
278 struct esp_pio_buffer *pio_buf;
279 struct esp_pio_buffer *err_buf;
280 unsigned char status_mask;
281
282 pio_buf = get_pio_buffer();
283
284 if (!pio_buf)
285 return;
286
287 err_buf = get_pio_buffer();
288
289 if (!err_buf) {
290 release_pio_buffer(pio_buf);
291 return;
292 }
293
294 status_mask = (info->read_status_mask >> 2) & 0x07;
295
296 for (i = 0; i < num_bytes - 1; i += 2) {
297 *((unsigned short *)(pio_buf->data + i)) =
298 inw(info->port + UART_ESI_RX);
299 err_buf->data[i] = serial_in(info, UART_ESI_RWS);
300 err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
301 err_buf->data[i] &= status_mask;
302 }
303
304 if (num_bytes & 0x0001) {
305 pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
306 err_buf->data[num_bytes - 1] =
307 (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
308 }
309
310 /* make sure everything is still ok since interrupts were enabled */
311 tty = info->tty;
312
313 if (!tty) {
314 release_pio_buffer(pio_buf);
315 release_pio_buffer(err_buf);
316 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
317 return;
318 }
319
320 status_mask = (info->ignore_status_mask >> 2) & 0x07;
321
322 for (i = 0; i < num_bytes; i++) {
323 if (!(err_buf->data[i] & status_mask)) {
324 int flag = 0;
325
326 if (err_buf->data[i] & 0x04) {
327 flag = TTY_BREAK;
328 if (info->flags & ASYNC_SAK)
329 do_SAK(tty);
330 } else if (err_buf->data[i] & 0x02)
331 flag = TTY_FRAME;
332 else if (err_buf->data[i] & 0x01)
333 flag = TTY_PARITY;
334 tty_insert_flip_char(tty, pio_buf->data[i], flag);
335 }
336 }
337
338 tty_schedule_flip(tty);
339
340 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
341 release_pio_buffer(pio_buf);
342 release_pio_buffer(err_buf);
343 }
344
345 static void program_isa_dma(int dma, int dir, unsigned long addr, int len)
346 {
347 unsigned long flags;
348
349 flags = claim_dma_lock();
350 disable_dma(dma);
351 clear_dma_ff(dma);
352 set_dma_mode(dma, dir);
353 set_dma_addr(dma, addr);
354 set_dma_count(dma, len);
355 enable_dma(dma);
356 release_dma_lock(flags);
357 }
358
359 static void receive_chars_dma(struct esp_struct *info, int num_bytes)
360 {
361 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
362 dma_bytes = num_bytes;
363 info->stat_flags |= ESP_STAT_DMA_RX;
364
365 program_isa_dma(dma, DMA_MODE_READ, isa_virt_to_bus(dma_buffer),
366 dma_bytes);
367 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
368 }
369
370 static inline void receive_chars_dma_done(struct esp_struct *info,
371 int status)
372 {
373 struct tty_struct *tty = info->tty;
374 int num_bytes;
375 unsigned long flags;
376
377 flags = claim_dma_lock();
378 disable_dma(dma);
379 clear_dma_ff(dma);
380
381 info->stat_flags &= ~ESP_STAT_DMA_RX;
382 num_bytes = dma_bytes - get_dma_residue(dma);
383 release_dma_lock(flags);
384
385 info->icount.rx += num_bytes;
386
387 if (num_bytes > 0) {
388 tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
389
390 status &= (0x1c & info->read_status_mask);
391
392 /* Is the status significant or do we throw the last byte ? */
393 if (!(status & info->ignore_status_mask)) {
394 int statflag = 0;
395
396 if (status & 0x10) {
397 statflag = TTY_BREAK;
398 (info->icount.brk)++;
399 if (info->flags & ASYNC_SAK)
400 do_SAK(tty);
401 } else if (status & 0x08) {
402 statflag = TTY_FRAME;
403 info->icount.frame++;
404 } else if (status & 0x04) {
405 statflag = TTY_PARITY;
406 info->icount.parity++;
407 }
408 tty_insert_flip_char(tty, dma_buffer[num_bytes - 1],
409 statflag);
410 }
411 tty_schedule_flip(tty);
412 }
413
414 if (dma_bytes != num_bytes) {
415 num_bytes = dma_bytes - num_bytes;
416 dma_bytes = 0;
417 receive_chars_dma(info, num_bytes);
418 } else
419 dma_bytes = 0;
420 }
421
422 /* Caller must hold info->lock */
423
424 static inline void transmit_chars_pio(struct esp_struct *info,
425 int space_avail)
426 {
427 int i;
428 struct esp_pio_buffer *pio_buf;
429
430 pio_buf = get_pio_buffer();
431
432 if (!pio_buf)
433 return;
434
435 while (space_avail && info->xmit_cnt) {
436 if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
437 memcpy(pio_buf->data,
438 &(info->xmit_buf[info->xmit_tail]),
439 space_avail);
440 } else {
441 i = ESP_XMIT_SIZE - info->xmit_tail;
442 memcpy(pio_buf->data,
443 &(info->xmit_buf[info->xmit_tail]), i);
444 memcpy(&(pio_buf->data[i]), info->xmit_buf,
445 space_avail - i);
446 }
447
448 info->xmit_cnt -= space_avail;
449 info->xmit_tail = (info->xmit_tail + space_avail) &
450 (ESP_XMIT_SIZE - 1);
451
452 for (i = 0; i < space_avail - 1; i += 2) {
453 outw(*((unsigned short *)(pio_buf->data + i)),
454 info->port + UART_ESI_TX);
455 }
456
457 if (space_avail & 0x0001)
458 serial_out(info, UART_ESI_TX,
459 pio_buf->data[space_avail - 1]);
460
461 if (info->xmit_cnt) {
462 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
463 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
464 space_avail = serial_in(info, UART_ESI_STAT1) << 8;
465 space_avail |= serial_in(info, UART_ESI_STAT2);
466
467 if (space_avail > info->xmit_cnt)
468 space_avail = info->xmit_cnt;
469 }
470 }
471
472 if (info->xmit_cnt < WAKEUP_CHARS) {
473 if (info->tty)
474 tty_wakeup(info->tty);
475
476 #ifdef SERIAL_DEBUG_INTR
477 printk("THRE...");
478 #endif
479
480 if (info->xmit_cnt <= 0) {
481 info->IER &= ~UART_IER_THRI;
482 serial_out(info, UART_ESI_CMD1,
483 ESI_SET_SRV_MASK);
484 serial_out(info, UART_ESI_CMD2, info->IER);
485 }
486 }
487
488 release_pio_buffer(pio_buf);
489 }
490
491 /* Caller must hold info->lock */
492 static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
493 {
494 dma_bytes = num_bytes;
495
496 if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
497 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
498 dma_bytes);
499 } else {
500 int i = ESP_XMIT_SIZE - info->xmit_tail;
501 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
502 i);
503 memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
504 }
505
506 info->xmit_cnt -= dma_bytes;
507 info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
508
509 if (info->xmit_cnt < WAKEUP_CHARS) {
510 if (info->tty)
511 tty_wakeup(info->tty);
512
513 #ifdef SERIAL_DEBUG_INTR
514 printk("THRE...");
515 #endif
516
517 if (info->xmit_cnt <= 0) {
518 info->IER &= ~UART_IER_THRI;
519 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
520 serial_out(info, UART_ESI_CMD2, info->IER);
521 }
522 }
523
524 info->stat_flags |= ESP_STAT_DMA_TX;
525
526 program_isa_dma(dma, DMA_MODE_WRITE, isa_virt_to_bus(dma_buffer),
527 dma_bytes);
528 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
529 }
530
531 static inline void transmit_chars_dma_done(struct esp_struct *info)
532 {
533 int num_bytes;
534 unsigned long flags;
535
536 flags = claim_dma_lock();
537 disable_dma(dma);
538 clear_dma_ff(dma);
539
540 num_bytes = dma_bytes - get_dma_residue(dma);
541 info->icount.tx += dma_bytes;
542 release_dma_lock(flags);
543
544 if (dma_bytes != num_bytes) {
545 dma_bytes -= num_bytes;
546 memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
547
548 program_isa_dma(dma, DMA_MODE_WRITE,
549 isa_virt_to_bus(dma_buffer), dma_bytes);
550
551 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
552 } else {
553 dma_bytes = 0;
554 info->stat_flags &= ~ESP_STAT_DMA_TX;
555 }
556 }
557
558 static void check_modem_status(struct esp_struct *info)
559 {
560 int status;
561
562 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
563 status = serial_in(info, UART_ESI_STAT2);
564
565 if (status & UART_MSR_ANY_DELTA) {
566 /* update input line counters */
567 if (status & UART_MSR_TERI)
568 info->icount.rng++;
569 if (status & UART_MSR_DDSR)
570 info->icount.dsr++;
571 if (status & UART_MSR_DDCD)
572 info->icount.dcd++;
573 if (status & UART_MSR_DCTS)
574 info->icount.cts++;
575 wake_up_interruptible(&info->delta_msr_wait);
576 }
577
578 if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
579 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
580 printk("ttys%d CD now %s...", info->line,
581 (status & UART_MSR_DCD) ? "on" : "off");
582 #endif
583 if (status & UART_MSR_DCD)
584 wake_up_interruptible(&info->open_wait);
585 else {
586 #ifdef SERIAL_DEBUG_OPEN
587 printk("scheduling hangup...");
588 #endif
589 tty_hangup(info->tty);
590 }
591 }
592 }
593
594 /*
595 * This is the serial driver's interrupt routine
596 */
597 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
598 {
599 struct esp_struct *info;
600 unsigned err_status;
601 unsigned int scratch;
602
603 #ifdef SERIAL_DEBUG_INTR
604 printk("rs_interrupt_single(%d)...", irq);
605 #endif
606 info = (struct esp_struct *)dev_id;
607 err_status = 0;
608 scratch = serial_in(info, UART_ESI_SID);
609
610 spin_lock(&info->lock);
611
612 if (!info->tty) {
613 spin_unlock(&info->lock);
614 return IRQ_NONE;
615 }
616
617 if (scratch & 0x04) { /* error */
618 serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
619 err_status = serial_in(info, UART_ESI_STAT1);
620 serial_in(info, UART_ESI_STAT2);
621
622 if (err_status & 0x01)
623 info->stat_flags |= ESP_STAT_RX_TIMEOUT;
624
625 if (err_status & 0x20) /* UART status */
626 check_modem_status(info);
627
628 if (err_status & 0x80) /* Start break */
629 wake_up_interruptible(&info->break_wait);
630 }
631
632 if ((scratch & 0x88) || /* DMA completed or timed out */
633 (err_status & 0x1c) /* receive error */) {
634 if (info->stat_flags & ESP_STAT_DMA_RX)
635 receive_chars_dma_done(info, err_status);
636 else if (info->stat_flags & ESP_STAT_DMA_TX)
637 transmit_chars_dma_done(info);
638 }
639
640 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
641 ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
642 (info->IER & UART_IER_RDI)) {
643 int num_bytes;
644
645 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
646 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
647 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
648 num_bytes |= serial_in(info, UART_ESI_STAT2);
649
650 num_bytes = tty_buffer_request_room(info->tty, num_bytes);
651
652 if (num_bytes) {
653 if (dma_bytes ||
654 (info->stat_flags & ESP_STAT_USE_PIO) ||
655 (num_bytes <= info->config.pio_threshold))
656 receive_chars_pio(info, num_bytes);
657 else
658 receive_chars_dma(info, num_bytes);
659 }
660 }
661
662 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
663 (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
664 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
665 info->IER &= ~UART_IER_THRI;
666 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
667 serial_out(info, UART_ESI_CMD2, info->IER);
668 } else {
669 int num_bytes;
670
671 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
672 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
673 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
674 num_bytes |= serial_in(info, UART_ESI_STAT2);
675
676 if (num_bytes > info->xmit_cnt)
677 num_bytes = info->xmit_cnt;
678
679 if (num_bytes) {
680 if (dma_bytes ||
681 (info->stat_flags & ESP_STAT_USE_PIO) ||
682 (num_bytes <= info->config.pio_threshold))
683 transmit_chars_pio(info, num_bytes);
684 else
685 transmit_chars_dma(info, num_bytes);
686 }
687 }
688 }
689
690 info->last_active = jiffies;
691
692 #ifdef SERIAL_DEBUG_INTR
693 printk("end.\n");
694 #endif
695 spin_unlock(&info->lock);
696 return IRQ_HANDLED;
697 }
698
699 /*
700 * -------------------------------------------------------------------
701 * Here ends the serial interrupt routines.
702 * -------------------------------------------------------------------
703 */
704
705 /*
706 * ---------------------------------------------------------------
707 * Low level utility subroutines for the serial driver: routines to
708 * figure out the appropriate timeout for an interrupt chain, routines
709 * to initialize and startup a serial port, and routines to shutdown a
710 * serial port. Useful stuff like that.
711 *
712 * Caller should hold lock
713 * ---------------------------------------------------------------
714 */
715
716 static void esp_basic_init(struct esp_struct *info)
717 {
718 /* put ESPC in enhanced mode */
719 serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
720
721 if (info->stat_flags & ESP_STAT_NEVER_DMA)
722 serial_out(info, UART_ESI_CMD2, 0x01);
723 else
724 serial_out(info, UART_ESI_CMD2, 0x31);
725
726 /* disable interrupts for now */
727 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
728 serial_out(info, UART_ESI_CMD2, 0x00);
729
730 /* set interrupt and DMA channel */
731 serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
732
733 if (info->stat_flags & ESP_STAT_NEVER_DMA)
734 serial_out(info, UART_ESI_CMD2, 0x01);
735 else
736 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
737
738 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
739
740 if (info->line % 8) /* secondary port */
741 serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
742 else if (info->irq == 9)
743 serial_out(info, UART_ESI_CMD2, 0x02);
744 else
745 serial_out(info, UART_ESI_CMD2, info->irq);
746
747 /* set error status mask (check this) */
748 serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
749
750 if (info->stat_flags & ESP_STAT_NEVER_DMA)
751 serial_out(info, UART_ESI_CMD2, 0xa1);
752 else
753 serial_out(info, UART_ESI_CMD2, 0xbd);
754
755 serial_out(info, UART_ESI_CMD2, 0x00);
756
757 /* set DMA timeout */
758 serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
759 serial_out(info, UART_ESI_CMD2, 0xff);
760
761 /* set FIFO trigger levels */
762 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
763 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
764 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
765 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
766 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
767
768 /* Set clock scaling and wait states */
769 serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
770 serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
771
772 /* set reinterrupt pacing */
773 serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
774 serial_out(info, UART_ESI_CMD2, 0xff);
775 }
776
777 static int startup(struct esp_struct *info)
778 {
779 unsigned long flags;
780 int retval = 0;
781 unsigned int num_chars;
782
783 spin_lock_irqsave(&info->lock, flags);
784
785 if (info->flags & ASYNC_INITIALIZED)
786 goto out;
787
788 if (!info->xmit_buf) {
789 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
790 retval = -ENOMEM;
791 if (!info->xmit_buf)
792 goto out;
793 }
794
795 #ifdef SERIAL_DEBUG_OPEN
796 printk(KERN_DEBUG "starting up ttys%d (irq %d)...",
797 info->line, info->irq);
798 #endif
799
800 /* Flush the RX buffer. Using the ESI flush command may cause */
801 /* wild interrupts, so read all the data instead. */
802
803 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
804 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
805 num_chars = serial_in(info, UART_ESI_STAT1) << 8;
806 num_chars |= serial_in(info, UART_ESI_STAT2);
807
808 while (num_chars > 1) {
809 inw(info->port + UART_ESI_RX);
810 num_chars -= 2;
811 }
812
813 if (num_chars)
814 serial_in(info, UART_ESI_RX);
815
816 /* set receive character timeout */
817 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
818 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
819
820 /* clear all flags except the "never DMA" flag */
821 info->stat_flags &= ESP_STAT_NEVER_DMA;
822
823 if (info->stat_flags & ESP_STAT_NEVER_DMA)
824 info->stat_flags |= ESP_STAT_USE_PIO;
825
826 spin_unlock_irqrestore(&info->lock, flags);
827
828 /*
829 * Allocate the IRQ
830 */
831
832 retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
833 "esp serial", info);
834
835 if (retval) {
836 if (capable(CAP_SYS_ADMIN)) {
837 if (info->tty)
838 set_bit(TTY_IO_ERROR,
839 &info->tty->flags);
840 retval = 0;
841 }
842 goto out_unlocked;
843 }
844
845 if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
846 dma_buffer = (char *)__get_dma_pages(
847 GFP_KERNEL, get_order(DMA_BUFFER_SZ));
848
849 /* use PIO mode if DMA buf/chan cannot be allocated */
850 if (!dma_buffer)
851 info->stat_flags |= ESP_STAT_USE_PIO;
852 else if (request_dma(dma, "esp serial")) {
853 free_pages((unsigned long)dma_buffer,
854 get_order(DMA_BUFFER_SZ));
855 dma_buffer = NULL;
856 info->stat_flags |= ESP_STAT_USE_PIO;
857 }
858
859 }
860
861 info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
862
863 spin_lock_irqsave(&info->lock, flags);
864 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
865 serial_out(info, UART_ESI_CMD2, UART_MCR);
866 serial_out(info, UART_ESI_CMD2, info->MCR);
867
868 /*
869 * Finally, enable interrupts
870 */
871 /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
872 info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
873 UART_IER_DMA_TC;
874 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
875 serial_out(info, UART_ESI_CMD2, info->IER);
876
877 if (info->tty)
878 clear_bit(TTY_IO_ERROR, &info->tty->flags);
879 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
880 spin_unlock_irqrestore(&info->lock, flags);
881
882 /*
883 * Set up the tty->alt_speed kludge
884 */
885 if (info->tty) {
886 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
887 info->tty->alt_speed = 57600;
888 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
889 info->tty->alt_speed = 115200;
890 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
891 info->tty->alt_speed = 230400;
892 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
893 info->tty->alt_speed = 460800;
894 }
895
896 /*
897 * set the speed of the serial port
898 */
899 change_speed(info);
900 info->flags |= ASYNC_INITIALIZED;
901 return 0;
902
903 out:
904 spin_unlock_irqrestore(&info->lock, flags);
905 out_unlocked:
906 return retval;
907 }
908
909 /*
910 * This routine will shutdown a serial port; interrupts are disabled, and
911 * DTR is dropped if the hangup on close termio flag is on.
912 */
913 static void shutdown(struct esp_struct *info)
914 {
915 unsigned long flags, f;
916
917 if (!(info->flags & ASYNC_INITIALIZED))
918 return;
919
920 #ifdef SERIAL_DEBUG_OPEN
921 printk("Shutting down serial port %d (irq %d)....", info->line,
922 info->irq);
923 #endif
924
925 spin_lock_irqsave(&info->lock, flags);
926 /*
927 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
928 * here so the queue might never be waken up
929 */
930 wake_up_interruptible(&info->delta_msr_wait);
931 wake_up_interruptible(&info->break_wait);
932
933 /* stop a DMA transfer on the port being closed */
934 /* DMA lock is higher priority always */
935 if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
936 f = claim_dma_lock();
937 disable_dma(dma);
938 clear_dma_ff(dma);
939 release_dma_lock(f);
940
941 dma_bytes = 0;
942 }
943
944 /*
945 * Free the IRQ
946 */
947 free_irq(info->irq, info);
948
949 if (dma_buffer) {
950 struct esp_struct *current_port = ports;
951
952 while (current_port) {
953 if ((current_port != info) &&
954 (current_port->flags & ASYNC_INITIALIZED))
955 break;
956
957 current_port = current_port->next_port;
958 }
959
960 if (!current_port) {
961 free_dma(dma);
962 free_pages((unsigned long)dma_buffer,
963 get_order(DMA_BUFFER_SZ));
964 dma_buffer = NULL;
965 }
966 }
967
968 if (info->xmit_buf) {
969 free_page((unsigned long) info->xmit_buf);
970 info->xmit_buf = NULL;
971 }
972
973 info->IER = 0;
974 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
975 serial_out(info, UART_ESI_CMD2, 0x00);
976
977 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
978 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
979
980 info->MCR &= ~UART_MCR_OUT2;
981 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
982 serial_out(info, UART_ESI_CMD2, UART_MCR);
983 serial_out(info, UART_ESI_CMD2, info->MCR);
984
985 if (info->tty)
986 set_bit(TTY_IO_ERROR, &info->tty->flags);
987
988 info->flags &= ~ASYNC_INITIALIZED;
989 spin_unlock_irqrestore(&info->lock, flags);
990 }
991
992 /*
993 * This routine is called to set the UART divisor registers to match
994 * the specified baud rate for a serial port.
995 */
996 static void change_speed(struct esp_struct *info)
997 {
998 unsigned short port;
999 int quot = 0;
1000 unsigned cflag, cval;
1001 int baud, bits;
1002 unsigned char flow1 = 0, flow2 = 0;
1003 unsigned long flags;
1004
1005 if (!info->tty || !info->tty->termios)
1006 return;
1007 cflag = info->tty->termios->c_cflag;
1008 port = info->port;
1009
1010 /* byte size and parity */
1011 switch (cflag & CSIZE) {
1012 case CS5: cval = 0x00; bits = 7; break;
1013 case CS6: cval = 0x01; bits = 8; break;
1014 case CS7: cval = 0x02; bits = 9; break;
1015 case CS8: cval = 0x03; bits = 10; break;
1016 default: cval = 0x00; bits = 7; break;
1017 }
1018 if (cflag & CSTOPB) {
1019 cval |= 0x04;
1020 bits++;
1021 }
1022 if (cflag & PARENB) {
1023 cval |= UART_LCR_PARITY;
1024 bits++;
1025 }
1026 if (!(cflag & PARODD))
1027 cval |= UART_LCR_EPAR;
1028 #ifdef CMSPAR
1029 if (cflag & CMSPAR)
1030 cval |= UART_LCR_SPAR;
1031 #endif
1032 baud = tty_get_baud_rate(info->tty);
1033 if (baud == 38400 &&
1034 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1035 quot = info->custom_divisor;
1036 else {
1037 if (baud == 134) /* Special case since 134 is really 134.5 */
1038 quot = (2*BASE_BAUD / 269);
1039 else if (baud)
1040 quot = BASE_BAUD / baud;
1041 }
1042 /* If the quotient is ever zero, default to 9600 bps */
1043 if (!quot)
1044 quot = BASE_BAUD / 9600;
1045
1046 if (baud) {
1047 /* Actual rate */
1048 baud = BASE_BAUD/quot;
1049 tty_encode_baud_rate(info->tty, baud, baud);
1050 }
1051 info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1052
1053 /* CTS flow control flag and modem status interrupts */
1054 /* info->IER &= ~UART_IER_MSI; */
1055 if (cflag & CRTSCTS) {
1056 info->flags |= ASYNC_CTS_FLOW;
1057 /* info->IER |= UART_IER_MSI; */
1058 flow1 = 0x04;
1059 flow2 = 0x10;
1060 } else
1061 info->flags &= ~ASYNC_CTS_FLOW;
1062 if (cflag & CLOCAL)
1063 info->flags &= ~ASYNC_CHECK_CD;
1064 else
1065 info->flags |= ASYNC_CHECK_CD;
1066
1067 /*
1068 * Set up parity check flag
1069 */
1070 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1071 if (I_INPCK(info->tty))
1072 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1073 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1074 info->read_status_mask |= UART_LSR_BI;
1075
1076 info->ignore_status_mask = 0;
1077 #if 0
1078 /* This should be safe, but for some broken bits of hardware... */
1079 if (I_IGNPAR(info->tty)) {
1080 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1081 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1082 }
1083 #endif
1084 if (I_IGNBRK(info->tty)) {
1085 info->ignore_status_mask |= UART_LSR_BI;
1086 info->read_status_mask |= UART_LSR_BI;
1087 /*
1088 * If we're ignore parity and break indicators, ignore
1089 * overruns too. (For real raw support).
1090 */
1091 if (I_IGNPAR(info->tty)) {
1092 info->ignore_status_mask |= UART_LSR_OE | \
1093 UART_LSR_PE | UART_LSR_FE;
1094 info->read_status_mask |= UART_LSR_OE | \
1095 UART_LSR_PE | UART_LSR_FE;
1096 }
1097 }
1098
1099 if (I_IXOFF(info->tty))
1100 flow1 |= 0x81;
1101
1102 spin_lock_irqsave(&info->lock, flags);
1103 /* set baud */
1104 serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1105 serial_out(info, UART_ESI_CMD2, quot >> 8);
1106 serial_out(info, UART_ESI_CMD2, quot & 0xff);
1107
1108 /* set data bits, parity, etc. */
1109 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1110 serial_out(info, UART_ESI_CMD2, UART_LCR);
1111 serial_out(info, UART_ESI_CMD2, cval);
1112
1113 /* Enable flow control */
1114 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1115 serial_out(info, UART_ESI_CMD2, flow1);
1116 serial_out(info, UART_ESI_CMD2, flow2);
1117
1118 /* set flow control characters (XON/XOFF only) */
1119 if (I_IXOFF(info->tty)) {
1120 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1121 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1122 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1123 serial_out(info, UART_ESI_CMD2, 0x10);
1124 serial_out(info, UART_ESI_CMD2, 0x21);
1125 switch (cflag & CSIZE) {
1126 case CS5:
1127 serial_out(info, UART_ESI_CMD2, 0x1f);
1128 break;
1129 case CS6:
1130 serial_out(info, UART_ESI_CMD2, 0x3f);
1131 break;
1132 case CS7:
1133 case CS8:
1134 serial_out(info, UART_ESI_CMD2, 0x7f);
1135 break;
1136 default:
1137 serial_out(info, UART_ESI_CMD2, 0xff);
1138 break;
1139 }
1140 }
1141
1142 /* Set high/low water */
1143 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1144 serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1145 serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1146 serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1147 serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1148
1149 spin_unlock_irqrestore(&info->lock, flags);
1150 }
1151
1152 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
1153 {
1154 struct esp_struct *info = tty->driver_data;
1155 unsigned long flags;
1156 int ret = 0;
1157
1158 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1159 return 0;
1160
1161 if (!info->xmit_buf)
1162 return 0;
1163
1164 spin_lock_irqsave(&info->lock, flags);
1165 if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
1166 info->xmit_buf[info->xmit_head++] = ch;
1167 info->xmit_head &= ESP_XMIT_SIZE-1;
1168 info->xmit_cnt++;
1169 ret = 1;
1170 }
1171 spin_unlock_irqrestore(&info->lock, flags);
1172 return ret;
1173 }
1174
1175 static void rs_flush_chars(struct tty_struct *tty)
1176 {
1177 struct esp_struct *info = tty->driver_data;
1178 unsigned long flags;
1179
1180 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1181 return;
1182
1183 spin_lock_irqsave(&info->lock, flags);
1184
1185 if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1186 goto out;
1187
1188 if (!(info->IER & UART_IER_THRI)) {
1189 info->IER |= UART_IER_THRI;
1190 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1191 serial_out(info, UART_ESI_CMD2, info->IER);
1192 }
1193 out:
1194 spin_unlock_irqrestore(&info->lock, flags);
1195 }
1196
1197 static int rs_write(struct tty_struct *tty,
1198 const unsigned char *buf, int count)
1199 {
1200 int c, t, ret = 0;
1201 struct esp_struct *info = tty->driver_data;
1202 unsigned long flags;
1203
1204 if (serial_paranoia_check(info, tty->name, "rs_write"))
1205 return 0;
1206
1207 if (!info->xmit_buf)
1208 return 0;
1209
1210 while (1) {
1211 /* Thanks to R. Wolff for suggesting how to do this with */
1212 /* interrupts enabled */
1213
1214 c = count;
1215 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1216
1217 if (t < c)
1218 c = t;
1219
1220 t = ESP_XMIT_SIZE - info->xmit_head;
1221
1222 if (t < c)
1223 c = t;
1224
1225 if (c <= 0)
1226 break;
1227
1228 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1229
1230 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1231 info->xmit_cnt += c;
1232 buf += c;
1233 count -= c;
1234 ret += c;
1235 }
1236
1237 spin_lock_irqsave(&info->lock, flags);
1238
1239 if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1240 info->IER |= UART_IER_THRI;
1241 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1242 serial_out(info, UART_ESI_CMD2, info->IER);
1243 }
1244
1245 spin_unlock_irqrestore(&info->lock, flags);
1246 return ret;
1247 }
1248
1249 static int rs_write_room(struct tty_struct *tty)
1250 {
1251 struct esp_struct *info = tty->driver_data;
1252 int ret;
1253 unsigned long flags;
1254
1255 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1256 return 0;
1257
1258 spin_lock_irqsave(&info->lock, flags);
1259
1260 ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1261 if (ret < 0)
1262 ret = 0;
1263 spin_unlock_irqrestore(&info->lock, flags);
1264 return ret;
1265 }
1266
1267 static int rs_chars_in_buffer(struct tty_struct *tty)
1268 {
1269 struct esp_struct *info = tty->driver_data;
1270
1271 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1272 return 0;
1273 return info->xmit_cnt;
1274 }
1275
1276 static void rs_flush_buffer(struct tty_struct *tty)
1277 {
1278 struct esp_struct *info = tty->driver_data;
1279 unsigned long flags;
1280
1281 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1282 return;
1283 spin_lock_irqsave(&info->lock, flags);
1284 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1285 spin_unlock_irqrestore(&info->lock, flags);
1286 tty_wakeup(tty);
1287 }
1288
1289 /*
1290 * ------------------------------------------------------------
1291 * rs_throttle()
1292 *
1293 * This routine is called by the upper-layer tty layer to signal that
1294 * incoming characters should be throttled.
1295 * ------------------------------------------------------------
1296 */
1297 static void rs_throttle(struct tty_struct *tty)
1298 {
1299 struct esp_struct *info = tty->driver_data;
1300 unsigned long flags;
1301 #ifdef SERIAL_DEBUG_THROTTLE
1302 char buf[64];
1303
1304 printk("throttle %s: %d....\n", tty_name(tty, buf),
1305 tty_chars_in_buffer(tty));
1306 #endif
1307
1308 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1309 return;
1310
1311 spin_lock_irqsave(&info->lock, flags);
1312 info->IER &= ~UART_IER_RDI;
1313 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1314 serial_out(info, UART_ESI_CMD2, info->IER);
1315 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1316 serial_out(info, UART_ESI_CMD2, 0x00);
1317 spin_unlock_irqrestore(&info->lock, flags);
1318 }
1319
1320 static void rs_unthrottle(struct tty_struct *tty)
1321 {
1322 struct esp_struct *info = tty->driver_data;
1323 unsigned long flags;
1324 #ifdef SERIAL_DEBUG_THROTTLE
1325 char buf[64];
1326
1327 printk(KERN_DEBUG "unthrottle %s: %d....\n", tty_name(tty, buf),
1328 tty_chars_in_buffer(tty));
1329 #endif
1330
1331 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1332 return;
1333
1334 spin_lock_irqsave(&info->lock, flags);
1335 info->IER |= UART_IER_RDI;
1336 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1337 serial_out(info, UART_ESI_CMD2, info->IER);
1338 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1339 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1340 spin_unlock_irqrestore(&info->lock, flags);
1341 }
1342
1343 /*
1344 * ------------------------------------------------------------
1345 * rs_ioctl() and friends
1346 * ------------------------------------------------------------
1347 */
1348
1349 static int get_serial_info(struct esp_struct *info,
1350 struct serial_struct __user *retinfo)
1351 {
1352 struct serial_struct tmp;
1353
1354 lock_kernel();
1355 memset(&tmp, 0, sizeof(tmp));
1356 tmp.type = PORT_16550A;
1357 tmp.line = info->line;
1358 tmp.port = info->port;
1359 tmp.irq = info->irq;
1360 tmp.flags = info->flags;
1361 tmp.xmit_fifo_size = 1024;
1362 tmp.baud_base = BASE_BAUD;
1363 tmp.close_delay = info->close_delay;
1364 tmp.closing_wait = info->closing_wait;
1365 tmp.custom_divisor = info->custom_divisor;
1366 tmp.hub6 = 0;
1367 unlock_kernel();
1368 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1369 return -EFAULT;
1370 return 0;
1371 }
1372
1373 static int get_esp_config(struct esp_struct *info,
1374 struct hayes_esp_config __user *retinfo)
1375 {
1376 struct hayes_esp_config tmp;
1377
1378 if (!retinfo)
1379 return -EFAULT;
1380
1381 memset(&tmp, 0, sizeof(tmp));
1382 lock_kernel();
1383 tmp.rx_timeout = info->config.rx_timeout;
1384 tmp.rx_trigger = info->config.rx_trigger;
1385 tmp.tx_trigger = info->config.tx_trigger;
1386 tmp.flow_off = info->config.flow_off;
1387 tmp.flow_on = info->config.flow_on;
1388 tmp.pio_threshold = info->config.pio_threshold;
1389 tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1390 unlock_kernel();
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 current_async = ports;
1554
1555 while (current_async) {
1556 if (current_async == info) {
1557 if (current_async->count > 1)
1558 return -EBUSY;
1559 } else if (current_async->count)
1560 return -EBUSY;
1561
1562 current_async = current_async->next_port;
1563 }
1564
1565 shutdown(info);
1566 dma = new_config.dma_channel;
1567 info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1568
1569 /* all ports must use the same DMA channel */
1570
1571 spin_lock_irqsave(&info->lock, flags);
1572 current_async = ports;
1573
1574 while (current_async) {
1575 esp_basic_init(current_async);
1576 current_async = current_async->next_port;
1577 }
1578 spin_unlock_irqrestore(&info->lock, flags);
1579 } else {
1580 /* DMA mode to PIO mode only */
1581 if (info->count > 1)
1582 return -EBUSY;
1583
1584 shutdown(info);
1585 spin_lock_irqsave(&info->lock, flags);
1586 info->stat_flags |= ESP_STAT_NEVER_DMA;
1587 esp_basic_init(info);
1588 spin_unlock_irqrestore(&info->lock, flags);
1589 }
1590 }
1591
1592 info->config.pio_threshold = new_config.pio_threshold;
1593
1594 if ((new_config.flow_off != info->config.flow_off) ||
1595 (new_config.flow_on != info->config.flow_on)) {
1596 info->config.flow_off = new_config.flow_off;
1597 info->config.flow_on = new_config.flow_on;
1598
1599 spin_lock_irqsave(&info->lock, flags);
1600 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1601 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1602 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1603 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1604 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1605 spin_unlock_irqrestore(&info->lock, flags);
1606 }
1607
1608 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1609 (new_config.tx_trigger != info->config.tx_trigger)) {
1610 info->config.rx_trigger = new_config.rx_trigger;
1611 info->config.tx_trigger = new_config.tx_trigger;
1612 spin_lock_irqsave(&info->lock, flags);
1613 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1614 serial_out(info, UART_ESI_CMD2,
1615 new_config.rx_trigger >> 8);
1616 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1617 serial_out(info, UART_ESI_CMD2,
1618 new_config.tx_trigger >> 8);
1619 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1620 spin_unlock_irqrestore(&info->lock, flags);
1621 }
1622
1623 if (new_config.rx_timeout != info->config.rx_timeout) {
1624 info->config.rx_timeout = new_config.rx_timeout;
1625 spin_lock_irqsave(&info->lock, flags);
1626
1627 if (info->IER & UART_IER_RDI) {
1628 serial_out(info, UART_ESI_CMD1,
1629 ESI_SET_RX_TIMEOUT);
1630 serial_out(info, UART_ESI_CMD2,
1631 new_config.rx_timeout);
1632 }
1633
1634 spin_unlock_irqrestore(&info->lock, flags);
1635 }
1636
1637 if (!(info->flags & ASYNC_INITIALIZED))
1638 retval = startup(info);
1639
1640 return retval;
1641 }
1642
1643 /*
1644 * get_lsr_info - get line status register info
1645 *
1646 * Purpose: Let user call ioctl() to get info when the UART physically
1647 * is emptied. On bus types like RS485, the transmitter must
1648 * release the bus after transmitting. This must be done when
1649 * the transmit shift register is empty, not be done when the
1650 * transmit holding register is empty. This functionality
1651 * allows an RS485 driver to be written in user space.
1652 */
1653 static int get_lsr_info(struct esp_struct *info, unsigned int __user *value)
1654 {
1655 unsigned char status;
1656 unsigned int result;
1657 unsigned long flags;
1658
1659 spin_lock_irqsave(&info->lock, flags);
1660 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1661 status = serial_in(info, UART_ESI_STAT1);
1662 spin_unlock_irqrestore(&info->lock, flags);
1663 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1664 return put_user(result, value);
1665 }
1666
1667
1668 static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1669 {
1670 struct esp_struct *info = tty->driver_data;
1671 unsigned char control, status;
1672 unsigned long flags;
1673
1674 if (serial_paranoia_check(info, tty->name, __func__))
1675 return -ENODEV;
1676 if (tty->flags & (1 << TTY_IO_ERROR))
1677 return -EIO;
1678
1679 control = info->MCR;
1680
1681 spin_lock_irqsave(&info->lock, flags);
1682 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1683 status = serial_in(info, UART_ESI_STAT2);
1684 spin_unlock_irqrestore(&info->lock, flags);
1685
1686 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1687 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1688 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1689 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1690 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1691 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1692 }
1693
1694 static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1695 unsigned int set, unsigned int clear)
1696 {
1697 struct esp_struct *info = tty->driver_data;
1698 unsigned long flags;
1699
1700 if (serial_paranoia_check(info, tty->name, __func__))
1701 return -ENODEV;
1702 if (tty->flags & (1 << TTY_IO_ERROR))
1703 return -EIO;
1704
1705 spin_lock_irqsave(&info->lock, flags);
1706
1707 if (set & TIOCM_RTS)
1708 info->MCR |= UART_MCR_RTS;
1709 if (set & TIOCM_DTR)
1710 info->MCR |= UART_MCR_DTR;
1711
1712 if (clear & TIOCM_RTS)
1713 info->MCR &= ~UART_MCR_RTS;
1714 if (clear & TIOCM_DTR)
1715 info->MCR &= ~UART_MCR_DTR;
1716
1717 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1718 serial_out(info, UART_ESI_CMD2, UART_MCR);
1719 serial_out(info, UART_ESI_CMD2, info->MCR);
1720
1721 spin_unlock_irqrestore(&info->lock, flags);
1722 return 0;
1723 }
1724
1725 /*
1726 * rs_break() --- routine which turns the break handling on or off
1727 */
1728 static void esp_break(struct tty_struct *tty, int break_state)
1729 {
1730 struct esp_struct *info = tty->driver_data;
1731 unsigned long flags;
1732
1733 if (serial_paranoia_check(info, tty->name, "esp_break"))
1734 return;
1735
1736 if (break_state == -1) {
1737 spin_lock_irqsave(&info->lock, flags);
1738 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1739 serial_out(info, UART_ESI_CMD2, 0x01);
1740 spin_unlock_irqrestore(&info->lock, flags);
1741
1742 /* FIXME - new style wait needed here */
1743 interruptible_sleep_on(&info->break_wait);
1744 } else {
1745 spin_lock_irqsave(&info->lock, flags);
1746 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1747 serial_out(info, UART_ESI_CMD2, 0x00);
1748 spin_unlock_irqrestore(&info->lock, flags);
1749 }
1750 }
1751
1752 static int rs_ioctl(struct tty_struct *tty, struct file *file,
1753 unsigned int cmd, unsigned long arg)
1754 {
1755 struct esp_struct *info = tty->driver_data;
1756 struct async_icount cprev, cnow; /* kernel counter temps */
1757 struct serial_icounter_struct __user *p_cuser; /* user space */
1758 void __user *argp = (void __user *)arg;
1759 unsigned long flags;
1760 int ret;
1761
1762 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1763 return -ENODEV;
1764
1765 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1766 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1767 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1768 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1769 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1770 if (tty->flags & (1 << TTY_IO_ERROR))
1771 return -EIO;
1772 }
1773
1774 switch (cmd) {
1775 case TIOCGSERIAL:
1776 return get_serial_info(info, argp);
1777 case TIOCSSERIAL:
1778 lock_kernel();
1779 ret = set_serial_info(info, argp);
1780 unlock_kernel();
1781 return ret;
1782 case TIOCSERGWILD:
1783 return put_user(0L, (unsigned long __user *)argp);
1784 case TIOCSERGETLSR: /* Get line status register */
1785 return get_lsr_info(info, argp);
1786 case TIOCSERSWILD:
1787 if (!capable(CAP_SYS_ADMIN))
1788 return -EPERM;
1789 return 0;
1790 /*
1791 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1792 * - mask passed in arg for lines of interest
1793 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1794 * Caller should use TIOCGICOUNT to see which one it was
1795 */
1796 case TIOCMIWAIT:
1797 spin_lock_irqsave(&info->lock, flags);
1798 cprev = info->icount; /* note the counters on entry */
1799 spin_unlock_irqrestore(&info->lock, flags);
1800 while (1) {
1801 /* FIXME: convert to new style wakeup */
1802 interruptible_sleep_on(&info->delta_msr_wait);
1803 /* see if a signal did it */
1804 if (signal_pending(current))
1805 return -ERESTARTSYS;
1806 spin_lock_irqsave(&info->lock, flags);
1807 cnow = info->icount; /* atomic copy */
1808 spin_unlock_irqrestore(&info->lock, flags);
1809 if (cnow.rng == cprev.rng &&
1810 cnow.dsr == cprev.dsr &&
1811 cnow.dcd == cprev.dcd &&
1812 cnow.cts == cprev.cts)
1813 return -EIO; /* no change => error */
1814 if (((arg & TIOCM_RNG) &&
1815 (cnow.rng != cprev.rng)) ||
1816 ((arg & TIOCM_DSR) &&
1817 (cnow.dsr != cprev.dsr)) ||
1818 ((arg & TIOCM_CD) &&
1819 (cnow.dcd != cprev.dcd)) ||
1820 ((arg & TIOCM_CTS) &&
1821 (cnow.cts != cprev.cts))) {
1822 return 0;
1823 }
1824 cprev = cnow;
1825 }
1826 /* NOTREACHED */
1827 /*
1828 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1829 * Return: write counters to the user passed counter struct
1830 * NB: both 1->0 and 0->1 transitions are counted except for
1831 * RI where only 0->1 is counted.
1832 */
1833 case TIOCGICOUNT:
1834 spin_lock_irqsave(&info->lock, flags);
1835 cnow = info->icount;
1836 spin_unlock_irqrestore(&info->lock, flags);
1837 p_cuser = argp;
1838 if (put_user(cnow.cts, &p_cuser->cts) ||
1839 put_user(cnow.dsr, &p_cuser->dsr) ||
1840 put_user(cnow.rng, &p_cuser->rng) ||
1841 put_user(cnow.dcd, &p_cuser->dcd))
1842 return -EFAULT;
1843 return 0;
1844 case TIOCGHAYESESP:
1845 return get_esp_config(info, argp);
1846 case TIOCSHAYESESP:
1847 lock_kernel();
1848 ret = set_esp_config(info, argp);
1849 unlock_kernel();
1850 return ret;
1851 default:
1852 return -ENOIOCTLCMD;
1853 }
1854 return 0;
1855 }
1856
1857 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1858 {
1859 struct esp_struct *info = tty->driver_data;
1860 unsigned long flags;
1861
1862 change_speed(info);
1863
1864 spin_lock_irqsave(&info->lock, flags);
1865
1866 /* Handle transition to B0 status */
1867 if ((old_termios->c_cflag & CBAUD) &&
1868 !(tty->termios->c_cflag & CBAUD)) {
1869 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1870 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1871 serial_out(info, UART_ESI_CMD2, UART_MCR);
1872 serial_out(info, UART_ESI_CMD2, info->MCR);
1873 }
1874
1875 /* Handle transition away from B0 status */
1876 if (!(old_termios->c_cflag & CBAUD) &&
1877 (tty->termios->c_cflag & CBAUD)) {
1878 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1879 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1880 serial_out(info, UART_ESI_CMD2, UART_MCR);
1881 serial_out(info, UART_ESI_CMD2, info->MCR);
1882 }
1883
1884 spin_unlock_irqrestore(&info->lock, flags);
1885
1886 /* Handle turning of CRTSCTS */
1887 if ((old_termios->c_cflag & CRTSCTS) &&
1888 !(tty->termios->c_cflag & CRTSCTS)) {
1889 rs_start(tty);
1890 }
1891 }
1892
1893 /*
1894 * ------------------------------------------------------------
1895 * rs_close()
1896 *
1897 * This routine is called when the serial port gets closed. First, we
1898 * wait for the last remaining data to be sent. Then, we unlink its
1899 * async structure from the interrupt chain if necessary, and we free
1900 * that IRQ if nothing is left in the chain.
1901 * ------------------------------------------------------------
1902 */
1903 static void rs_close(struct tty_struct *tty, struct file *filp)
1904 {
1905 struct esp_struct *info = tty->driver_data;
1906 unsigned long flags;
1907
1908 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1909 return;
1910
1911 spin_lock_irqsave(&info->lock, flags);
1912
1913 if (tty_hung_up_p(filp)) {
1914 DBG_CNT("before DEC-hung");
1915 goto out;
1916 }
1917
1918 #ifdef SERIAL_DEBUG_OPEN
1919 printk(KERN_DEBUG "rs_close ttys%d, count = %d\n",
1920 info->line, info->count);
1921 #endif
1922 if (tty->count == 1 && info->count != 1) {
1923 /*
1924 * Uh, oh. tty->count is 1, which means that the tty
1925 * structure will be freed. Info->count should always
1926 * be one in these conditions. If it's greater than
1927 * one, we've got real problems, since it means the
1928 * serial port won't be shutdown.
1929 */
1930 printk(KERN_DEBUG "rs_close: bad serial port count; tty->count is 1, info->count is %d\n", info->count);
1931 info->count = 1;
1932 }
1933 if (--info->count < 0) {
1934 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
1935 info->line, info->count);
1936 info->count = 0;
1937 }
1938 if (info->count) {
1939 DBG_CNT("before DEC-2");
1940 goto out;
1941 }
1942 info->flags |= ASYNC_CLOSING;
1943
1944 spin_unlock_irqrestore(&info->lock, flags);
1945 /*
1946 * Now we wait for the transmit buffer to clear; and we notify
1947 * the line discipline to only process XON/XOFF characters.
1948 */
1949 tty->closing = 1;
1950 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1951 tty_wait_until_sent(tty, info->closing_wait);
1952 /*
1953 * At this point we stop accepting input. To do this, we
1954 * disable the receive line status interrupts, and tell the
1955 * interrupt driver to stop checking the data ready bit in the
1956 * line status register.
1957 */
1958 /* info->IER &= ~UART_IER_RLSI; */
1959 info->IER &= ~UART_IER_RDI;
1960 info->read_status_mask &= ~UART_LSR_DR;
1961 if (info->flags & ASYNC_INITIALIZED) {
1962
1963 spin_lock_irqsave(&info->lock, flags);
1964 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1965 serial_out(info, UART_ESI_CMD2, info->IER);
1966
1967 /* disable receive timeout */
1968 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1969 serial_out(info, UART_ESI_CMD2, 0x00);
1970
1971 spin_unlock_irqrestore(&info->lock, flags);
1972
1973 /*
1974 * Before we drop DTR, make sure the UART transmitter
1975 * has completely drained; this is especially
1976 * important if there is a transmit FIFO!
1977 */
1978 rs_wait_until_sent(tty, info->timeout);
1979 }
1980 shutdown(info);
1981 rs_flush_buffer(tty);
1982 tty_ldisc_flush(tty);
1983 tty->closing = 0;
1984 info->tty = NULL;
1985
1986 if (info->blocked_open) {
1987 if (info->close_delay)
1988 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1989 wake_up_interruptible(&info->open_wait);
1990 }
1991 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1992 wake_up_interruptible(&info->close_wait);
1993 return;
1994
1995 out:
1996 spin_unlock_irqrestore(&info->lock, flags);
1997 }
1998
1999 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2000 {
2001 struct esp_struct *info = tty->driver_data;
2002 unsigned long orig_jiffies, char_time;
2003 unsigned long flags;
2004
2005 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2006 return;
2007
2008 orig_jiffies = jiffies;
2009 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2010
2011 if (!char_time)
2012 char_time = 1;
2013
2014 spin_lock_irqsave(&info->lock, flags);
2015 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2016 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2017
2018 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2019 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2020
2021 spin_unlock_irqrestore(&info->lock, flags);
2022 msleep_interruptible(jiffies_to_msecs(char_time));
2023
2024 if (signal_pending(current))
2025 return;
2026
2027 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2028 return;
2029
2030 spin_lock_irqsave(&info->lock, flags);
2031 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2032 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2033 }
2034 spin_unlock_irqrestore(&info->lock, flags);
2035 set_current_state(TASK_RUNNING);
2036 }
2037
2038 /*
2039 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2040 */
2041 static void esp_hangup(struct tty_struct *tty)
2042 {
2043 struct esp_struct *info = tty->driver_data;
2044
2045 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2046 return;
2047
2048 rs_flush_buffer(tty);
2049 shutdown(info);
2050 info->count = 0;
2051 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2052 info->tty = NULL;
2053 wake_up_interruptible(&info->open_wait);
2054 }
2055
2056 /*
2057 * ------------------------------------------------------------
2058 * esp_open() and friends
2059 * ------------------------------------------------------------
2060 */
2061 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2062 struct esp_struct *info)
2063 {
2064 DECLARE_WAITQUEUE(wait, current);
2065 int retval;
2066 int do_clocal = 0;
2067 unsigned long flags;
2068
2069 /*
2070 * If the device is in the middle of being closed, then block
2071 * until it's done, and then try again.
2072 */
2073 if (tty_hung_up_p(filp) ||
2074 (info->flags & ASYNC_CLOSING)) {
2075 if (info->flags & ASYNC_CLOSING)
2076 interruptible_sleep_on(&info->close_wait);
2077 #ifdef SERIAL_DO_RESTART
2078 if (info->flags & ASYNC_HUP_NOTIFY)
2079 return -EAGAIN;
2080 else
2081 return -ERESTARTSYS;
2082 #else
2083 return -EAGAIN;
2084 #endif
2085 }
2086
2087 /*
2088 * If non-blocking mode is set, or the port is not enabled,
2089 * then make the check up front and then exit.
2090 */
2091 if ((filp->f_flags & O_NONBLOCK) ||
2092 (tty->flags & (1 << TTY_IO_ERROR))) {
2093 info->flags |= ASYNC_NORMAL_ACTIVE;
2094 return 0;
2095 }
2096
2097 if (tty->termios->c_cflag & CLOCAL)
2098 do_clocal = 1;
2099
2100 /*
2101 * Block waiting for the carrier detect and the line to become
2102 * free (i.e., not in use by the callout). While we are in
2103 * this loop, info->count is dropped by one, so that
2104 * rs_close() knows when to free things. We restore it upon
2105 * exit, either normal or abnormal.
2106 */
2107 retval = 0;
2108 add_wait_queue(&info->open_wait, &wait);
2109 #ifdef SERIAL_DEBUG_OPEN
2110 printk(KERN_DEBUG "block_til_ready before block: ttys%d, count = %d\n",
2111 info->line, info->count);
2112 #endif
2113 spin_lock_irqsave(&info->lock, flags);
2114 if (!tty_hung_up_p(filp))
2115 info->count--;
2116 info->blocked_open++;
2117 while (1) {
2118 if ((tty->termios->c_cflag & CBAUD)) {
2119 unsigned int scratch;
2120
2121 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2122 serial_out(info, UART_ESI_CMD2, UART_MCR);
2123 scratch = serial_in(info, UART_ESI_STAT1);
2124 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2125 serial_out(info, UART_ESI_CMD2, UART_MCR);
2126 serial_out(info, UART_ESI_CMD2,
2127 scratch | UART_MCR_DTR | UART_MCR_RTS);
2128 }
2129 set_current_state(TASK_INTERRUPTIBLE);
2130 if (tty_hung_up_p(filp) ||
2131 !(info->flags & ASYNC_INITIALIZED)) {
2132 #ifdef SERIAL_DO_RESTART
2133 if (info->flags & ASYNC_HUP_NOTIFY)
2134 retval = -EAGAIN;
2135 else
2136 retval = -ERESTARTSYS;
2137 #else
2138 retval = -EAGAIN;
2139 #endif
2140 break;
2141 }
2142
2143 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2144 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2145 do_clocal = 1;
2146
2147 if (!(info->flags & ASYNC_CLOSING) &&
2148 (do_clocal))
2149 break;
2150 if (signal_pending(current)) {
2151 retval = -ERESTARTSYS;
2152 break;
2153 }
2154 #ifdef SERIAL_DEBUG_OPEN
2155 printk(KERN_DEBUG "block_til_ready blocking: ttys%d, count = %d\n",
2156 info->line, info->count);
2157 #endif
2158 spin_unlock_irqrestore(&info->lock, flags);
2159 schedule();
2160 spin_lock_irqsave(&info->lock, flags);
2161 }
2162 set_current_state(TASK_RUNNING);
2163 remove_wait_queue(&info->open_wait, &wait);
2164 if (!tty_hung_up_p(filp))
2165 info->count++;
2166 info->blocked_open--;
2167 spin_unlock_irqrestore(&info->lock, flags);
2168 #ifdef SERIAL_DEBUG_OPEN
2169 printk(KERN_DEBUG "block_til_ready after blocking: ttys%d, count = %d\n",
2170 info->line, info->count);
2171 #endif
2172 if (retval)
2173 return retval;
2174 info->flags |= ASYNC_NORMAL_ACTIVE;
2175 return 0;
2176 }
2177
2178 /*
2179 * This routine is called whenever a serial port is opened. It
2180 * enables interrupts for a serial port, linking in its async structure into
2181 * the IRQ chain. It also performs the serial-specific
2182 * initialization for the tty structure.
2183 */
2184 static int esp_open(struct tty_struct *tty, struct file *filp)
2185 {
2186 struct esp_struct *info;
2187 int retval, line;
2188 unsigned long flags;
2189
2190 line = tty->index;
2191 if ((line < 0) || (line >= NR_PORTS))
2192 return -ENODEV;
2193
2194 /* find the port in the chain */
2195
2196 info = ports;
2197
2198 while (info && (info->line != line))
2199 info = info->next_port;
2200
2201 if (!info) {
2202 serial_paranoia_check(info, tty->name, "esp_open");
2203 return -ENODEV;
2204 }
2205
2206 #ifdef SERIAL_DEBUG_OPEN
2207 printk(KERN_DEBUG "esp_open %s, count = %d\n", tty->name, info->count);
2208 #endif
2209 spin_lock_irqsave(&info->lock, flags);
2210 info->count++;
2211 tty->driver_data = info;
2212 info->tty = tty;
2213
2214 spin_unlock_irqrestore(&info->lock, flags);
2215
2216 /*
2217 * Start up serial port
2218 */
2219 retval = startup(info);
2220 if (retval)
2221 return retval;
2222
2223 retval = block_til_ready(tty, filp, info);
2224 if (retval) {
2225 #ifdef SERIAL_DEBUG_OPEN
2226 printk(KERN_DEBUG "esp_open returning after block_til_ready with %d\n",
2227 retval);
2228 #endif
2229 return retval;
2230 }
2231 #ifdef SERIAL_DEBUG_OPEN
2232 printk(KERN_DEBUG "esp_open %s successful...", tty->name);
2233 #endif
2234 return 0;
2235 }
2236
2237 /*
2238 * ---------------------------------------------------------------------
2239 * espserial_init() and friends
2240 *
2241 * espserial_init() is called at boot-time to initialize the serial driver.
2242 * ---------------------------------------------------------------------
2243 */
2244
2245 /*
2246 * This routine prints out the appropriate serial driver version
2247 * number, and identifies which options were configured into this
2248 * driver.
2249 */
2250
2251 static void show_serial_version(void)
2252 {
2253 printk(KERN_INFO "%s version %s (DMA %u)\n",
2254 serial_name, serial_version, dma);
2255 }
2256
2257 /*
2258 * This routine is called by espserial_init() to initialize a specific serial
2259 * port.
2260 */
2261 static int autoconfig(struct esp_struct *info)
2262 {
2263 int port_detected = 0;
2264 unsigned long flags;
2265
2266 if (!request_region(info->port, REGION_SIZE, "esp serial"))
2267 return -EIO;
2268
2269 spin_lock_irqsave(&info->lock, flags);
2270 /*
2271 * Check for ESP card
2272 */
2273
2274 if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2275 serial_out(info, UART_ESI_CMD1, 0x00);
2276 serial_out(info, UART_ESI_CMD1, 0x01);
2277
2278 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2279 port_detected = 1;
2280
2281 if (!(info->irq)) {
2282 serial_out(info, UART_ESI_CMD1, 0x02);
2283
2284 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2285 info->irq = 3;
2286 else
2287 info->irq = 4;
2288 }
2289
2290
2291 /* put card in enhanced mode */
2292 /* this prevents access through */
2293 /* the "old" IO ports */
2294 esp_basic_init(info);
2295
2296 /* clear out MCR */
2297 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2298 serial_out(info, UART_ESI_CMD2, UART_MCR);
2299 serial_out(info, UART_ESI_CMD2, 0x00);
2300 }
2301 }
2302 if (!port_detected)
2303 release_region(info->port, REGION_SIZE);
2304
2305 spin_unlock_irqrestore(&info->lock, flags);
2306 return (port_detected);
2307 }
2308
2309 static const struct tty_operations esp_ops = {
2310 .open = esp_open,
2311 .close = rs_close,
2312 .write = rs_write,
2313 .put_char = rs_put_char,
2314 .flush_chars = rs_flush_chars,
2315 .write_room = rs_write_room,
2316 .chars_in_buffer = rs_chars_in_buffer,
2317 .flush_buffer = rs_flush_buffer,
2318 .ioctl = rs_ioctl,
2319 .throttle = rs_throttle,
2320 .unthrottle = rs_unthrottle,
2321 .set_termios = rs_set_termios,
2322 .stop = rs_stop,
2323 .start = rs_start,
2324 .hangup = esp_hangup,
2325 .break_ctl = esp_break,
2326 .wait_until_sent = rs_wait_until_sent,
2327 .tiocmget = esp_tiocmget,
2328 .tiocmset = esp_tiocmset,
2329 };
2330
2331 /*
2332 * The serial driver boot-time initialization code!
2333 */
2334 static int __init espserial_init(void)
2335 {
2336 int i, offset;
2337 struct esp_struct *info;
2338 struct esp_struct *last_primary = NULL;
2339 int esp[] = { 0x100, 0x140, 0x180, 0x200, 0x240, 0x280, 0x300, 0x380 };
2340
2341 esp_driver = alloc_tty_driver(NR_PORTS);
2342 if (!esp_driver)
2343 return -ENOMEM;
2344
2345 for (i = 0; i < NR_PRIMARY; i++) {
2346 if (irq[i] != 0) {
2347 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2348 (irq[i] == 8) || (irq[i] == 13))
2349 irq[i] = 0;
2350 else if (irq[i] == 2)
2351 irq[i] = 9;
2352 }
2353 }
2354
2355 if ((dma != 1) && (dma != 3))
2356 dma = 0;
2357
2358 if ((rx_trigger < 1) || (rx_trigger > 1023))
2359 rx_trigger = 768;
2360
2361 if ((tx_trigger < 1) || (tx_trigger > 1023))
2362 tx_trigger = 768;
2363
2364 if ((flow_off < 1) || (flow_off > 1023))
2365 flow_off = 1016;
2366
2367 if ((flow_on < 1) || (flow_on > 1023))
2368 flow_on = 944;
2369
2370 if ((rx_timeout < 0) || (rx_timeout > 255))
2371 rx_timeout = 128;
2372
2373 if (flow_on >= flow_off)
2374 flow_on = flow_off - 1;
2375
2376 show_serial_version();
2377
2378 /* Initialize the tty_driver structure */
2379
2380 esp_driver->owner = THIS_MODULE;
2381 esp_driver->name = "ttyP";
2382 esp_driver->major = ESP_IN_MAJOR;
2383 esp_driver->minor_start = 0;
2384 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2385 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2386 esp_driver->init_termios = tty_std_termios;
2387 esp_driver->init_termios.c_cflag =
2388 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2389 esp_driver->init_termios.c_ispeed = 9600;
2390 esp_driver->init_termios.c_ospeed = 9600;
2391 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2392 tty_set_operations(esp_driver, &esp_ops);
2393 if (tty_register_driver(esp_driver)) {
2394 printk(KERN_ERR "Couldn't register esp serial driver");
2395 put_tty_driver(esp_driver);
2396 return 1;
2397 }
2398
2399 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
2400
2401 if (!info) {
2402 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2403 tty_unregister_driver(esp_driver);
2404 put_tty_driver(esp_driver);
2405 return 1;
2406 }
2407
2408 spin_lock_init(&info->lock);
2409 /* rx_trigger, tx_trigger are needed by autoconfig */
2410 info->config.rx_trigger = rx_trigger;
2411 info->config.tx_trigger = tx_trigger;
2412
2413 i = 0;
2414 offset = 0;
2415
2416 do {
2417 info->port = esp[i] + offset;
2418 info->irq = irq[i];
2419 info->line = (i * 8) + (offset / 8);
2420
2421 if (!autoconfig(info)) {
2422 i++;
2423 offset = 0;
2424 continue;
2425 }
2426
2427 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2428 info->flags = STD_COM_FLAGS;
2429 if (info->custom_divisor)
2430 info->flags |= ASYNC_SPD_CUST;
2431 info->magic = ESP_MAGIC;
2432 info->close_delay = 5*HZ/10;
2433 info->closing_wait = 30*HZ;
2434 info->config.rx_timeout = rx_timeout;
2435 info->config.flow_on = flow_on;
2436 info->config.flow_off = flow_off;
2437 info->config.pio_threshold = pio_threshold;
2438 info->next_port = ports;
2439 init_waitqueue_head(&info->open_wait);
2440 init_waitqueue_head(&info->close_wait);
2441 init_waitqueue_head(&info->delta_msr_wait);
2442 init_waitqueue_head(&info->break_wait);
2443 ports = info;
2444 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2445 info->line, info->port, info->irq);
2446
2447 if (info->line % 8) {
2448 printk("secondary port\n");
2449 /* 8 port cards can't do DMA */
2450 info->stat_flags |= ESP_STAT_NEVER_DMA;
2451
2452 if (last_primary)
2453 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2454 } else {
2455 printk("primary port\n");
2456 last_primary = info;
2457 irq[i] = info->irq;
2458 }
2459
2460 if (!dma)
2461 info->stat_flags |= ESP_STAT_NEVER_DMA;
2462
2463 info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
2464 if (!info) {
2465 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2466 /* allow use of the already detected ports */
2467 return 0;
2468 }
2469
2470 spin_lock_init(&info->lock);
2471 /* rx_trigger, tx_trigger are needed by autoconfig */
2472 info->config.rx_trigger = rx_trigger;
2473 info->config.tx_trigger = tx_trigger;
2474
2475 if (offset == 56) {
2476 i++;
2477 offset = 0;
2478 } else {
2479 offset += 8;
2480 }
2481 } while (i < NR_PRIMARY);
2482
2483 /* free the last port memory allocation */
2484 kfree(info);
2485
2486 return 0;
2487 }
2488
2489 static void __exit espserial_exit(void)
2490 {
2491 int e1;
2492 struct esp_struct *temp_async;
2493 struct esp_pio_buffer *pio_buf;
2494
2495 e1 = tty_unregister_driver(esp_driver);
2496 if (e1)
2497 printk(KERN_ERR "esp: failed to unregister driver (%d)\n", e1);
2498 put_tty_driver(esp_driver);
2499
2500 while (ports) {
2501 if (ports->port)
2502 release_region(ports->port, REGION_SIZE);
2503 temp_async = ports->next_port;
2504 kfree(ports);
2505 ports = temp_async;
2506 }
2507
2508 if (dma_buffer)
2509 free_pages((unsigned long)dma_buffer,
2510 get_order(DMA_BUFFER_SZ));
2511
2512 while (free_pio_buf) {
2513 pio_buf = free_pio_buf->next;
2514 kfree(free_pio_buf);
2515 free_pio_buf = pio_buf;
2516 }
2517 }
2518
2519 module_init(espserial_init);
2520 module_exit(espserial_exit);
Support for the Chinese Samsung S3C2440 based development boards