x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / s390 / char / con3215.c
blobbb86494e2b7b7878aecddf25b9df4b53fa443260
1 /*
2 * 3215 line mode terminal driver.
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Updated:
8 * Aug-2000: Added tab support
9 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kdev_t.h>
15 #include <linux/tty.h>
16 #include <linux/tty_flip.h>
17 #include <linux/vt_kern.h>
18 #include <linux/init.h>
19 #include <linux/console.h>
20 #include <linux/interrupt.h>
21 #include <linux/err.h>
22 #include <linux/reboot.h>
23 #include <linux/serial.h> /* ASYNC_* flags */
24 #include <linux/slab.h>
25 #include <asm/ccwdev.h>
26 #include <asm/cio.h>
27 #include <asm/io.h>
28 #include <asm/ebcdic.h>
29 #include <asm/uaccess.h>
30 #include <asm/delay.h>
31 #include <asm/cpcmd.h>
32 #include <asm/setup.h>
34 #include "ctrlchar.h"
36 #define NR_3215 1
37 #define NR_3215_REQ (4*NR_3215)
38 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
39 #define RAW3215_INBUF_SIZE 256 /* input buffer size */
40 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
41 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
42 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
43 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
44 #define RAW3215_NR_CCWS 3
45 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
47 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */
48 #define RAW3215_WORKING 4 /* set if a request is being worked on */
49 #define RAW3215_THROTTLED 8 /* set if reading is disabled */
50 #define RAW3215_STOPPED 16 /* set if writing is disabled */
51 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
52 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
54 #define TAB_STOP_SIZE 8 /* tab stop size */
57 * Request types for a 3215 device
59 enum raw3215_type {
60 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
64 * Request structure for a 3215 device
66 struct raw3215_req {
67 enum raw3215_type type; /* type of the request */
68 int start, len; /* start index & len in output buffer */
69 int delayable; /* indication to wait for more data */
70 int residual; /* residual count for read request */
71 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
72 struct raw3215_info *info; /* pointer to main structure */
73 struct raw3215_req *next; /* pointer to next request */
74 } __attribute__ ((aligned(8)));
76 struct raw3215_info {
77 struct tty_port port;
78 struct ccw_device *cdev; /* device for tty driver */
79 spinlock_t *lock; /* pointer to irq lock */
80 int flags; /* state flags */
81 char *buffer; /* pointer to output buffer */
82 char *inbuf; /* pointer to input buffer */
83 int head; /* first free byte in output buffer */
84 int count; /* number of bytes in output buffer */
85 int written; /* number of bytes in write requests */
86 struct raw3215_req *queued_read; /* pointer to queued read requests */
87 struct raw3215_req *queued_write;/* pointer to queued write requests */
88 struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */
89 wait_queue_head_t empty_wait; /* wait queue for flushing */
90 struct timer_list timer; /* timer for delayed output */
91 int line_pos; /* position on the line (for tabs) */
92 char ubuffer[80]; /* copy_from_user buffer */
95 /* array of 3215 devices structures */
96 static struct raw3215_info *raw3215[NR_3215];
97 /* spinlock to protect the raw3215 array */
98 static DEFINE_SPINLOCK(raw3215_device_lock);
99 /* list of free request structures */
100 static struct raw3215_req *raw3215_freelist;
101 /* spinlock to protect free list */
102 static spinlock_t raw3215_freelist_lock;
104 static struct tty_driver *tty3215_driver;
107 * Get a request structure from the free list
109 static inline struct raw3215_req *raw3215_alloc_req(void)
111 struct raw3215_req *req;
112 unsigned long flags;
114 spin_lock_irqsave(&raw3215_freelist_lock, flags);
115 req = raw3215_freelist;
116 raw3215_freelist = req->next;
117 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
118 return req;
122 * Put a request structure back to the free list
124 static inline void raw3215_free_req(struct raw3215_req *req)
126 unsigned long flags;
128 if (req->type == RAW3215_FREE)
129 return; /* don't free a free request */
130 req->type = RAW3215_FREE;
131 spin_lock_irqsave(&raw3215_freelist_lock, flags);
132 req->next = raw3215_freelist;
133 raw3215_freelist = req;
134 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
138 * Set up a read request that reads up to 160 byte from the 3215 device.
139 * If there is a queued read request it is used, but that shouldn't happen
140 * because a 3215 terminal won't accept a new read before the old one is
141 * completed.
143 static void raw3215_mk_read_req(struct raw3215_info *raw)
145 struct raw3215_req *req;
146 struct ccw1 *ccw;
148 /* there can only be ONE read request at a time */
149 req = raw->queued_read;
150 if (req == NULL) {
151 /* no queued read request, use new req structure */
152 req = raw3215_alloc_req();
153 req->type = RAW3215_READ;
154 req->info = raw;
155 raw->queued_read = req;
158 ccw = req->ccws;
159 ccw->cmd_code = 0x0A; /* read inquiry */
160 ccw->flags = 0x20; /* ignore incorrect length */
161 ccw->count = 160;
162 ccw->cda = (__u32) __pa(raw->inbuf);
166 * Set up a write request with the information from the main structure.
167 * A ccw chain is created that writes as much as possible from the output
168 * buffer to the 3215 device. If a queued write exists it is replaced by
169 * the new, probably lengthened request.
171 static void raw3215_mk_write_req(struct raw3215_info *raw)
173 struct raw3215_req *req;
174 struct ccw1 *ccw;
175 int len, count, ix, lines;
177 if (raw->count <= raw->written)
178 return;
179 /* check if there is a queued write request */
180 req = raw->queued_write;
181 if (req == NULL) {
182 /* no queued write request, use new req structure */
183 req = raw3215_alloc_req();
184 req->type = RAW3215_WRITE;
185 req->info = raw;
186 raw->queued_write = req;
187 } else {
188 raw->written -= req->len;
191 ccw = req->ccws;
192 req->start = (raw->head - raw->count + raw->written) &
193 (RAW3215_BUFFER_SIZE - 1);
195 * now we have to count newlines. We can at max accept
196 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
197 * a restriction in VM
199 lines = 0;
200 ix = req->start;
201 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
202 if (raw->buffer[ix] == 0x15)
203 lines++;
204 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
206 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
207 if (len > RAW3215_MAX_BYTES)
208 len = RAW3215_MAX_BYTES;
209 req->len = len;
210 raw->written += len;
212 /* set the indication if we should try to enlarge this request */
213 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
215 ix = req->start;
216 while (len > 0) {
217 if (ccw > req->ccws)
218 ccw[-1].flags |= 0x40; /* use command chaining */
219 ccw->cmd_code = 0x01; /* write, auto carrier return */
220 ccw->flags = 0x20; /* ignore incorrect length ind. */
221 ccw->cda =
222 (__u32) __pa(raw->buffer + ix);
223 count = len;
224 if (ix + count > RAW3215_BUFFER_SIZE)
225 count = RAW3215_BUFFER_SIZE - ix;
226 ccw->count = count;
227 len -= count;
228 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
229 ccw++;
232 * Add a NOP to the channel program. 3215 devices are purely
233 * emulated and its much better to avoid the channel end
234 * interrupt in this case.
236 if (ccw > req->ccws)
237 ccw[-1].flags |= 0x40; /* use command chaining */
238 ccw->cmd_code = 0x03; /* NOP */
239 ccw->flags = 0;
240 ccw->cda = 0;
241 ccw->count = 1;
245 * Start a read or a write request
247 static void raw3215_start_io(struct raw3215_info *raw)
249 struct raw3215_req *req;
250 int res;
252 req = raw->queued_read;
253 if (req != NULL &&
254 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
255 /* dequeue request */
256 raw->queued_read = NULL;
257 res = ccw_device_start(raw->cdev, req->ccws,
258 (unsigned long) req, 0, 0);
259 if (res != 0) {
260 /* do_IO failed, put request back to queue */
261 raw->queued_read = req;
262 } else {
263 raw->flags |= RAW3215_WORKING;
266 req = raw->queued_write;
267 if (req != NULL &&
268 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
269 /* dequeue request */
270 raw->queued_write = NULL;
271 res = ccw_device_start(raw->cdev, req->ccws,
272 (unsigned long) req, 0, 0);
273 if (res != 0) {
274 /* do_IO failed, put request back to queue */
275 raw->queued_write = req;
276 } else {
277 raw->flags |= RAW3215_WORKING;
283 * Function to start a delayed output after RAW3215_TIMEOUT seconds
285 static void raw3215_timeout(unsigned long __data)
287 struct raw3215_info *raw = (struct raw3215_info *) __data;
288 unsigned long flags;
290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
291 if (raw->flags & RAW3215_TIMER_RUNS) {
292 del_timer(&raw->timer);
293 raw->flags &= ~RAW3215_TIMER_RUNS;
294 if (!(raw->port.flags & ASYNC_SUSPENDED)) {
295 raw3215_mk_write_req(raw);
296 raw3215_start_io(raw);
299 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
303 * Function to conditionally start an IO. A read is started immediately,
304 * a write is only started immediately if the flush flag is on or the
305 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
306 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
308 static inline void raw3215_try_io(struct raw3215_info *raw)
310 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
311 (raw->port.flags & ASYNC_SUSPENDED))
312 return;
313 if (raw->queued_read != NULL)
314 raw3215_start_io(raw);
315 else if (raw->queued_write != NULL) {
316 if ((raw->queued_write->delayable == 0) ||
317 (raw->flags & RAW3215_FLUSHING)) {
318 /* execute write requests bigger than minimum size */
319 raw3215_start_io(raw);
320 if (raw->flags & RAW3215_TIMER_RUNS) {
321 del_timer(&raw->timer);
322 raw->flags &= ~RAW3215_TIMER_RUNS;
324 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
325 /* delay small writes */
326 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
327 add_timer(&raw->timer);
328 raw->flags |= RAW3215_TIMER_RUNS;
334 * Call tty_wakeup from tasklet context
336 static void raw3215_wakeup(unsigned long data)
338 struct raw3215_info *raw = (struct raw3215_info *) data;
339 struct tty_struct *tty;
341 tty = tty_port_tty_get(&raw->port);
342 if (tty) {
343 tty_wakeup(tty);
344 tty_kref_put(tty);
349 * Try to start the next IO and wake up processes waiting on the tty.
351 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
353 raw3215_mk_write_req(raw);
354 raw3215_try_io(raw);
355 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
356 tasklet_schedule(&raw->tlet);
360 * Interrupt routine, called from common io layer
362 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
363 struct irb *irb)
365 struct raw3215_info *raw;
366 struct raw3215_req *req;
367 struct tty_struct *tty;
368 int cstat, dstat;
369 int count;
371 raw = dev_get_drvdata(&cdev->dev);
372 req = (struct raw3215_req *) intparm;
373 tty = tty_port_tty_get(&raw->port);
374 cstat = irb->scsw.cmd.cstat;
375 dstat = irb->scsw.cmd.dstat;
376 if (cstat != 0)
377 raw3215_next_io(raw, tty);
378 if (dstat & 0x01) { /* we got a unit exception */
379 dstat &= ~0x01; /* we can ignore it */
381 switch (dstat) {
382 case 0x80:
383 if (cstat != 0)
384 break;
385 /* Attention interrupt, someone hit the enter key */
386 raw3215_mk_read_req(raw);
387 raw3215_next_io(raw, tty);
388 break;
389 case 0x08:
390 case 0x0C:
391 /* Channel end interrupt. */
392 if ((raw = req->info) == NULL)
393 goto put_tty; /* That shouldn't happen ... */
394 if (req->type == RAW3215_READ) {
395 /* store residual count, then wait for device end */
396 req->residual = irb->scsw.cmd.count;
398 if (dstat == 0x08)
399 break;
400 case 0x04:
401 /* Device end interrupt. */
402 if ((raw = req->info) == NULL)
403 goto put_tty; /* That shouldn't happen ... */
404 if (req->type == RAW3215_READ && tty != NULL) {
405 unsigned int cchar;
407 count = 160 - req->residual;
408 EBCASC(raw->inbuf, count);
409 cchar = ctrlchar_handle(raw->inbuf, count, tty);
410 switch (cchar & CTRLCHAR_MASK) {
411 case CTRLCHAR_SYSRQ:
412 break;
414 case CTRLCHAR_CTRL:
415 tty_insert_flip_char(&raw->port, cchar,
416 TTY_NORMAL);
417 tty_flip_buffer_push(&raw->port);
418 break;
420 case CTRLCHAR_NONE:
421 if (count < 2 ||
422 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
423 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
424 /* add the auto \n */
425 raw->inbuf[count] = '\n';
426 count++;
427 } else
428 count -= 2;
429 tty_insert_flip_string(&raw->port, raw->inbuf,
430 count);
431 tty_flip_buffer_push(&raw->port);
432 break;
434 } else if (req->type == RAW3215_WRITE) {
435 raw->count -= req->len;
436 raw->written -= req->len;
438 raw->flags &= ~RAW3215_WORKING;
439 raw3215_free_req(req);
440 /* check for empty wait */
441 if (waitqueue_active(&raw->empty_wait) &&
442 raw->queued_write == NULL &&
443 raw->queued_read == NULL) {
444 wake_up_interruptible(&raw->empty_wait);
446 raw3215_next_io(raw, tty);
447 break;
448 default:
449 /* Strange interrupt, I'll do my best to clean up */
450 if (req != NULL && req->type != RAW3215_FREE) {
451 if (req->type == RAW3215_WRITE) {
452 raw->count -= req->len;
453 raw->written -= req->len;
455 raw->flags &= ~RAW3215_WORKING;
456 raw3215_free_req(req);
458 raw3215_next_io(raw, tty);
460 put_tty:
461 tty_kref_put(tty);
465 * Drop the oldest line from the output buffer.
467 static void raw3215_drop_line(struct raw3215_info *raw)
469 int ix;
470 char ch;
472 BUG_ON(raw->written != 0);
473 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
474 while (raw->count > 0) {
475 ch = raw->buffer[ix];
476 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
477 raw->count--;
478 if (ch == 0x15)
479 break;
481 raw->head = ix;
485 * Wait until length bytes are available int the output buffer.
486 * Has to be called with the s390irq lock held. Can be called
487 * disabled.
489 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
491 while (RAW3215_BUFFER_SIZE - raw->count < length) {
492 /* While console is frozen for suspend we have no other
493 * choice but to drop message from the buffer to make
494 * room for even more messages. */
495 if (raw->port.flags & ASYNC_SUSPENDED) {
496 raw3215_drop_line(raw);
497 continue;
499 /* there might be a request pending */
500 raw->flags |= RAW3215_FLUSHING;
501 raw3215_mk_write_req(raw);
502 raw3215_try_io(raw);
503 raw->flags &= ~RAW3215_FLUSHING;
504 #ifdef CONFIG_TN3215_CONSOLE
505 ccw_device_wait_idle(raw->cdev);
506 #endif
507 /* Enough room freed up ? */
508 if (RAW3215_BUFFER_SIZE - raw->count >= length)
509 break;
510 /* there might be another cpu waiting for the lock */
511 spin_unlock(get_ccwdev_lock(raw->cdev));
512 udelay(100);
513 spin_lock(get_ccwdev_lock(raw->cdev));
518 * String write routine for 3215 devices
520 static void raw3215_write(struct raw3215_info *raw, const char *str,
521 unsigned int length)
523 unsigned long flags;
524 int c, count;
526 while (length > 0) {
527 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
528 count = (length > RAW3215_BUFFER_SIZE) ?
529 RAW3215_BUFFER_SIZE : length;
530 length -= count;
532 raw3215_make_room(raw, count);
534 /* copy string to output buffer and convert it to EBCDIC */
535 while (1) {
536 c = min_t(int, count,
537 min(RAW3215_BUFFER_SIZE - raw->count,
538 RAW3215_BUFFER_SIZE - raw->head));
539 if (c <= 0)
540 break;
541 memcpy(raw->buffer + raw->head, str, c);
542 ASCEBC(raw->buffer + raw->head, c);
543 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
544 raw->count += c;
545 raw->line_pos += c;
546 str += c;
547 count -= c;
549 if (!(raw->flags & RAW3215_WORKING)) {
550 raw3215_mk_write_req(raw);
551 /* start or queue request */
552 raw3215_try_io(raw);
554 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
559 * Put character routine for 3215 devices
561 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
563 unsigned long flags;
564 unsigned int length, i;
566 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
567 if (ch == '\t') {
568 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
569 raw->line_pos += length;
570 ch = ' ';
571 } else if (ch == '\n') {
572 length = 1;
573 raw->line_pos = 0;
574 } else {
575 length = 1;
576 raw->line_pos++;
578 raw3215_make_room(raw, length);
580 for (i = 0; i < length; i++) {
581 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
582 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
583 raw->count++;
585 if (!(raw->flags & RAW3215_WORKING)) {
586 raw3215_mk_write_req(raw);
587 /* start or queue request */
588 raw3215_try_io(raw);
590 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
594 * Flush routine, it simply sets the flush flag and tries to start
595 * pending IO.
597 static void raw3215_flush_buffer(struct raw3215_info *raw)
599 unsigned long flags;
601 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
602 if (raw->count > 0) {
603 raw->flags |= RAW3215_FLUSHING;
604 raw3215_try_io(raw);
605 raw->flags &= ~RAW3215_FLUSHING;
607 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
611 * Fire up a 3215 device.
613 static int raw3215_startup(struct raw3215_info *raw)
615 unsigned long flags;
617 if (raw->port.flags & ASYNC_INITIALIZED)
618 return 0;
619 raw->line_pos = 0;
620 raw->port.flags |= ASYNC_INITIALIZED;
621 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
622 raw3215_try_io(raw);
623 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
625 return 0;
629 * Shutdown a 3215 device.
631 static void raw3215_shutdown(struct raw3215_info *raw)
633 DECLARE_WAITQUEUE(wait, current);
634 unsigned long flags;
636 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
637 (raw->flags & RAW3215_FIXED))
638 return;
639 /* Wait for outstanding requests, then free irq */
640 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
641 if ((raw->flags & RAW3215_WORKING) ||
642 raw->queued_write != NULL ||
643 raw->queued_read != NULL) {
644 raw->port.flags |= ASYNC_CLOSING;
645 add_wait_queue(&raw->empty_wait, &wait);
646 set_current_state(TASK_INTERRUPTIBLE);
647 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
648 schedule();
649 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
650 remove_wait_queue(&raw->empty_wait, &wait);
651 set_current_state(TASK_RUNNING);
652 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
654 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
657 static struct raw3215_info *raw3215_alloc_info(void)
659 struct raw3215_info *info;
661 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
662 if (!info)
663 return NULL;
665 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
666 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
667 if (!info->buffer || !info->inbuf) {
668 kfree(info);
669 return NULL;
672 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
673 init_waitqueue_head(&info->empty_wait);
674 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
675 tty_port_init(&info->port);
677 return info;
680 static void raw3215_free_info(struct raw3215_info *raw)
682 kfree(raw->inbuf);
683 kfree(raw->buffer);
684 tty_port_destroy(&raw->port);
685 kfree(raw);
688 static int raw3215_probe (struct ccw_device *cdev)
690 struct raw3215_info *raw;
691 int line;
693 /* Console is special. */
694 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
695 return 0;
697 raw = raw3215_alloc_info();
698 if (raw == NULL)
699 return -ENOMEM;
701 raw->cdev = cdev;
702 dev_set_drvdata(&cdev->dev, raw);
703 cdev->handler = raw3215_irq;
705 spin_lock(&raw3215_device_lock);
706 for (line = 0; line < NR_3215; line++) {
707 if (!raw3215[line]) {
708 raw3215[line] = raw;
709 break;
712 spin_unlock(&raw3215_device_lock);
713 if (line == NR_3215) {
714 raw3215_free_info(raw);
715 return -ENODEV;
718 return 0;
721 static void raw3215_remove (struct ccw_device *cdev)
723 struct raw3215_info *raw;
724 unsigned int line;
726 ccw_device_set_offline(cdev);
727 raw = dev_get_drvdata(&cdev->dev);
728 if (raw) {
729 spin_lock(&raw3215_device_lock);
730 for (line = 0; line < NR_3215; line++)
731 if (raw3215[line] == raw)
732 break;
733 raw3215[line] = NULL;
734 spin_unlock(&raw3215_device_lock);
735 dev_set_drvdata(&cdev->dev, NULL);
736 raw3215_free_info(raw);
740 static int raw3215_set_online (struct ccw_device *cdev)
742 struct raw3215_info *raw;
744 raw = dev_get_drvdata(&cdev->dev);
745 if (!raw)
746 return -ENODEV;
748 return raw3215_startup(raw);
751 static int raw3215_set_offline (struct ccw_device *cdev)
753 struct raw3215_info *raw;
755 raw = dev_get_drvdata(&cdev->dev);
756 if (!raw)
757 return -ENODEV;
759 raw3215_shutdown(raw);
761 return 0;
764 static int raw3215_pm_stop(struct ccw_device *cdev)
766 struct raw3215_info *raw;
767 unsigned long flags;
769 /* Empty the output buffer, then prevent new I/O. */
770 raw = dev_get_drvdata(&cdev->dev);
771 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
772 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
773 raw->port.flags |= ASYNC_SUSPENDED;
774 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
775 return 0;
778 static int raw3215_pm_start(struct ccw_device *cdev)
780 struct raw3215_info *raw;
781 unsigned long flags;
783 /* Allow I/O again and flush output buffer. */
784 raw = dev_get_drvdata(&cdev->dev);
785 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
786 raw->port.flags &= ~ASYNC_SUSPENDED;
787 raw->flags |= RAW3215_FLUSHING;
788 raw3215_try_io(raw);
789 raw->flags &= ~RAW3215_FLUSHING;
790 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
791 return 0;
794 static struct ccw_device_id raw3215_id[] = {
795 { CCW_DEVICE(0x3215, 0) },
796 { /* end of list */ },
799 static struct ccw_driver raw3215_ccw_driver = {
800 .driver = {
801 .name = "3215",
802 .owner = THIS_MODULE,
804 .ids = raw3215_id,
805 .probe = &raw3215_probe,
806 .remove = &raw3215_remove,
807 .set_online = &raw3215_set_online,
808 .set_offline = &raw3215_set_offline,
809 .freeze = &raw3215_pm_stop,
810 .thaw = &raw3215_pm_start,
811 .restore = &raw3215_pm_start,
812 .int_class = IRQIO_C15,
815 #ifdef CONFIG_TN3215_CONSOLE
817 * Write a string to the 3215 console
819 static void con3215_write(struct console *co, const char *str,
820 unsigned int count)
822 struct raw3215_info *raw;
823 int i;
825 if (count <= 0)
826 return;
827 raw = raw3215[0]; /* console 3215 is the first one */
828 while (count > 0) {
829 for (i = 0; i < count; i++)
830 if (str[i] == '\t' || str[i] == '\n')
831 break;
832 raw3215_write(raw, str, i);
833 count -= i;
834 str += i;
835 if (count > 0) {
836 raw3215_putchar(raw, *str);
837 count--;
838 str++;
843 static struct tty_driver *con3215_device(struct console *c, int *index)
845 *index = c->index;
846 return tty3215_driver;
850 * panic() calls con3215_flush through a panic_notifier
851 * before the system enters a disabled, endless loop.
853 static void con3215_flush(void)
855 struct raw3215_info *raw;
856 unsigned long flags;
858 raw = raw3215[0]; /* console 3215 is the first one */
859 if (raw->port.flags & ASYNC_SUSPENDED)
860 /* The console is still frozen for suspend. */
861 if (ccw_device_force_console(raw->cdev))
862 /* Forcing didn't work, no panic message .. */
863 return;
864 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
865 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
866 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
869 static int con3215_notify(struct notifier_block *self,
870 unsigned long event, void *data)
872 con3215_flush();
873 return NOTIFY_OK;
876 static struct notifier_block on_panic_nb = {
877 .notifier_call = con3215_notify,
878 .priority = 0,
881 static struct notifier_block on_reboot_nb = {
882 .notifier_call = con3215_notify,
883 .priority = 0,
887 * The console structure for the 3215 console
889 static struct console con3215 = {
890 .name = "ttyS",
891 .write = con3215_write,
892 .device = con3215_device,
893 .flags = CON_PRINTBUFFER,
897 * 3215 console initialization code called from console_init().
899 static int __init con3215_init(void)
901 struct ccw_device *cdev;
902 struct raw3215_info *raw;
903 struct raw3215_req *req;
904 int i;
906 /* Check if 3215 is to be the console */
907 if (!CONSOLE_IS_3215)
908 return -ENODEV;
910 /* Set the console mode for VM */
911 if (MACHINE_IS_VM) {
912 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
913 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
916 /* allocate 3215 request structures */
917 raw3215_freelist = NULL;
918 spin_lock_init(&raw3215_freelist_lock);
919 for (i = 0; i < NR_3215_REQ; i++) {
920 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
921 req->next = raw3215_freelist;
922 raw3215_freelist = req;
925 cdev = ccw_device_probe_console(&raw3215_ccw_driver);
926 if (IS_ERR(cdev))
927 return -ENODEV;
929 raw3215[0] = raw = raw3215_alloc_info();
930 raw->cdev = cdev;
931 dev_set_drvdata(&cdev->dev, raw);
932 cdev->handler = raw3215_irq;
934 raw->flags |= RAW3215_FIXED;
936 /* Request the console irq */
937 if (raw3215_startup(raw) != 0) {
938 raw3215_free_info(raw);
939 raw3215[0] = NULL;
940 return -ENODEV;
942 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
943 register_reboot_notifier(&on_reboot_nb);
944 register_console(&con3215);
945 return 0;
947 console_initcall(con3215_init);
948 #endif
950 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
952 struct raw3215_info *raw;
954 raw = raw3215[tty->index];
955 if (raw == NULL)
956 return -ENODEV;
958 tty->driver_data = raw;
960 return tty_port_install(&raw->port, driver, tty);
964 * tty3215_open
966 * This routine is called whenever a 3215 tty is opened.
968 static int tty3215_open(struct tty_struct *tty, struct file * filp)
970 struct raw3215_info *raw = tty->driver_data;
971 int retval;
973 tty_port_tty_set(&raw->port, tty);
975 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
977 * Start up 3215 device
979 retval = raw3215_startup(raw);
980 if (retval)
981 return retval;
983 return 0;
987 * tty3215_close()
989 * This routine is called when the 3215 tty is closed. We wait
990 * for the remaining request to be completed. Then we clean up.
992 static void tty3215_close(struct tty_struct *tty, struct file * filp)
994 struct raw3215_info *raw;
996 raw = (struct raw3215_info *) tty->driver_data;
997 if (raw == NULL || tty->count > 1)
998 return;
999 tty->closing = 1;
1000 /* Shutdown the terminal */
1001 raw3215_shutdown(raw);
1002 tasklet_kill(&raw->tlet);
1003 tty->closing = 0;
1004 tty_port_tty_set(&raw->port, NULL);
1008 * Returns the amount of free space in the output buffer.
1010 static int tty3215_write_room(struct tty_struct *tty)
1012 struct raw3215_info *raw;
1014 raw = (struct raw3215_info *) tty->driver_data;
1016 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1017 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1018 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1019 else
1020 return 0;
1024 * String write routine for 3215 ttys
1026 static int tty3215_write(struct tty_struct * tty,
1027 const unsigned char *buf, int count)
1029 struct raw3215_info *raw;
1031 if (!tty)
1032 return 0;
1033 raw = (struct raw3215_info *) tty->driver_data;
1034 raw3215_write(raw, buf, count);
1035 return count;
1039 * Put character routine for 3215 ttys
1041 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1043 struct raw3215_info *raw;
1045 if (!tty)
1046 return 0;
1047 raw = (struct raw3215_info *) tty->driver_data;
1048 raw3215_putchar(raw, ch);
1049 return 1;
1052 static void tty3215_flush_chars(struct tty_struct *tty)
1057 * Returns the number of characters in the output buffer
1059 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1061 struct raw3215_info *raw;
1063 raw = (struct raw3215_info *) tty->driver_data;
1064 return raw->count;
1067 static void tty3215_flush_buffer(struct tty_struct *tty)
1069 struct raw3215_info *raw;
1071 raw = (struct raw3215_info *) tty->driver_data;
1072 raw3215_flush_buffer(raw);
1073 tty_wakeup(tty);
1077 * Disable reading from a 3215 tty
1079 static void tty3215_throttle(struct tty_struct * tty)
1081 struct raw3215_info *raw;
1083 raw = (struct raw3215_info *) tty->driver_data;
1084 raw->flags |= RAW3215_THROTTLED;
1088 * Enable reading from a 3215 tty
1090 static void tty3215_unthrottle(struct tty_struct * tty)
1092 struct raw3215_info *raw;
1093 unsigned long flags;
1095 raw = (struct raw3215_info *) tty->driver_data;
1096 if (raw->flags & RAW3215_THROTTLED) {
1097 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1098 raw->flags &= ~RAW3215_THROTTLED;
1099 raw3215_try_io(raw);
1100 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1105 * Disable writing to a 3215 tty
1107 static void tty3215_stop(struct tty_struct *tty)
1109 struct raw3215_info *raw;
1111 raw = (struct raw3215_info *) tty->driver_data;
1112 raw->flags |= RAW3215_STOPPED;
1116 * Enable writing to a 3215 tty
1118 static void tty3215_start(struct tty_struct *tty)
1120 struct raw3215_info *raw;
1121 unsigned long flags;
1123 raw = (struct raw3215_info *) tty->driver_data;
1124 if (raw->flags & RAW3215_STOPPED) {
1125 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1126 raw->flags &= ~RAW3215_STOPPED;
1127 raw3215_try_io(raw);
1128 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1132 static const struct tty_operations tty3215_ops = {
1133 .install = tty3215_install,
1134 .open = tty3215_open,
1135 .close = tty3215_close,
1136 .write = tty3215_write,
1137 .put_char = tty3215_put_char,
1138 .flush_chars = tty3215_flush_chars,
1139 .write_room = tty3215_write_room,
1140 .chars_in_buffer = tty3215_chars_in_buffer,
1141 .flush_buffer = tty3215_flush_buffer,
1142 .throttle = tty3215_throttle,
1143 .unthrottle = tty3215_unthrottle,
1144 .stop = tty3215_stop,
1145 .start = tty3215_start,
1149 * 3215 tty registration code called from tty_init().
1150 * Most kernel services (incl. kmalloc) are available at this poimt.
1152 static int __init tty3215_init(void)
1154 struct tty_driver *driver;
1155 int ret;
1157 if (!CONSOLE_IS_3215)
1158 return 0;
1160 driver = alloc_tty_driver(NR_3215);
1161 if (!driver)
1162 return -ENOMEM;
1164 ret = ccw_driver_register(&raw3215_ccw_driver);
1165 if (ret) {
1166 put_tty_driver(driver);
1167 return ret;
1170 * Initialize the tty_driver structure
1171 * Entries in tty3215_driver that are NOT initialized:
1172 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1175 driver->driver_name = "tty3215";
1176 driver->name = "ttyS";
1177 driver->major = TTY_MAJOR;
1178 driver->minor_start = 64;
1179 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1180 driver->subtype = SYSTEM_TYPE_TTY;
1181 driver->init_termios = tty_std_termios;
1182 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1183 driver->init_termios.c_oflag = ONLCR | XTABS;
1184 driver->init_termios.c_lflag = ISIG;
1185 driver->flags = TTY_DRIVER_REAL_RAW;
1186 tty_set_operations(driver, &tty3215_ops);
1187 ret = tty_register_driver(driver);
1188 if (ret) {
1189 put_tty_driver(driver);
1190 return ret;
1192 tty3215_driver = driver;
1193 return 0;
1196 static void __exit tty3215_exit(void)
1198 tty_unregister_driver(tty3215_driver);
1199 put_tty_driver(tty3215_driver);
1200 ccw_driver_unregister(&raw3215_ccw_driver);
1203 module_init(tty3215_init);
1204 module_exit(tty3215_exit);