1 /*
2 * 3215 line mode terminal driver.
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
6 *
7 * Updated:
8 * Aug-2000: Added tab support
9 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
10 */
11
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>
33
34 #include "ctrlchar.h"
35
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 */
46
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) */
53
54 #define TAB_STOP_SIZE 8 /* tab stop size */
55
56 /*
57 * Request types for a 3215 device
58 */
59 enum raw3215_type {
60 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
61 };
62
63 /*
64 * Request structure for a 3215 device
65 */
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)));
75
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 */
93 };
94
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;
103
104 static struct tty_driver *tty3215_driver;
105
106 /*
107 * Get a request structure from the free list
108 */
raw3215_alloc_req(void)109 static inline struct raw3215_req *raw3215_alloc_req(void)
110 {
111 struct raw3215_req *req;
112 unsigned long flags;
113
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;
119 }
120
121 /*
122 * Put a request structure back to the free list
123 */
raw3215_free_req(struct raw3215_req * req)124 static inline void raw3215_free_req(struct raw3215_req *req)
125 {
126 unsigned long flags;
127
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);
135 }
136
137 /*
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.
142 */
raw3215_mk_read_req(struct raw3215_info * raw)143 static void raw3215_mk_read_req(struct raw3215_info *raw)
144 {
145 struct raw3215_req *req;
146 struct ccw1 *ccw;
147
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;
156 }
157
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);
163 }
164
165 /*
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.
170 */
raw3215_mk_write_req(struct raw3215_info * raw)171 static void raw3215_mk_write_req(struct raw3215_info *raw)
172 {
173 struct raw3215_req *req;
174 struct ccw1 *ccw;
175 int len, count, ix, lines;
176
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;
189 }
190
191 ccw = req->ccws;
192 req->start = (raw->head - raw->count + raw->written) &
193 (RAW3215_BUFFER_SIZE - 1);
194 /*
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
198 */
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);
205 }
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;
211
212 /* set the indication if we should try to enlarge this request */
213 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
214
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++;
230 }
231 /*
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.
235 */
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;
242 }
243
244 /*
245 * Start a read or a write request
246 */
raw3215_start_io(struct raw3215_info * raw)247 static void raw3215_start_io(struct raw3215_info *raw)
248 {
249 struct raw3215_req *req;
250 int res;
251
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;
264 }
265 }
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;
278 }
279 }
280 }
281
282 /*
283 * Function to start a delayed output after RAW3215_TIMEOUT seconds
284 */
raw3215_timeout(unsigned long __data)285 static void raw3215_timeout(unsigned long __data)
286 {
287 struct raw3215_info *raw = (struct raw3215_info *) __data;
288 unsigned long flags;
289
290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
291 raw->flags &= ~RAW3215_TIMER_RUNS;
292 if (!tty_port_suspended(&raw->port)) {
293 raw3215_mk_write_req(raw);
294 raw3215_start_io(raw);
295 if ((raw->queued_read || raw->queued_write) &&
296 !(raw->flags & RAW3215_WORKING) &&
297 !(raw->flags & RAW3215_TIMER_RUNS)) {
298 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
299 add_timer(&raw->timer);
300 raw->flags |= RAW3215_TIMER_RUNS;
301 }
302 }
303 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
304 }
305
306 /*
307 * Function to conditionally start an IO. A read is started immediately,
308 * a write is only started immediately if the flush flag is on or the
309 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
310 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
311 */
raw3215_try_io(struct raw3215_info * raw)312 static inline void raw3215_try_io(struct raw3215_info *raw)
313 {
314 if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port))
315 return;
316 if (raw->queued_read != NULL)
317 raw3215_start_io(raw);
318 else if (raw->queued_write != NULL) {
319 if ((raw->queued_write->delayable == 0) ||
320 (raw->flags & RAW3215_FLUSHING)) {
321 /* execute write requests bigger than minimum size */
322 raw3215_start_io(raw);
323 }
324 }
325 if ((raw->queued_read || raw->queued_write) &&
326 !(raw->flags & RAW3215_WORKING) &&
327 !(raw->flags & RAW3215_TIMER_RUNS)) {
328 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
329 add_timer(&raw->timer);
330 raw->flags |= RAW3215_TIMER_RUNS;
331 }
332 }
333
334 /*
335 * Call tty_wakeup from tasklet context
336 */
raw3215_wakeup(unsigned long data)337 static void raw3215_wakeup(unsigned long data)
338 {
339 struct raw3215_info *raw = (struct raw3215_info *) data;
340 struct tty_struct *tty;
341
342 tty = tty_port_tty_get(&raw->port);
343 if (tty) {
344 tty_wakeup(tty);
345 tty_kref_put(tty);
346 }
347 }
348
349 /*
350 * Try to start the next IO and wake up processes waiting on the tty.
351 */
raw3215_next_io(struct raw3215_info * raw,struct tty_struct * tty)352 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
353 {
354 raw3215_mk_write_req(raw);
355 raw3215_try_io(raw);
356 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
357 tasklet_schedule(&raw->tlet);
358 }
359
360 /*
361 * Interrupt routine, called from common io layer
362 */
raw3215_irq(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)363 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
364 struct irb *irb)
365 {
366 struct raw3215_info *raw;
367 struct raw3215_req *req;
368 struct tty_struct *tty;
369 int cstat, dstat;
370 int count;
371
372 raw = dev_get_drvdata(&cdev->dev);
373 req = (struct raw3215_req *) intparm;
374 tty = tty_port_tty_get(&raw->port);
375 cstat = irb->scsw.cmd.cstat;
376 dstat = irb->scsw.cmd.dstat;
377 if (cstat != 0)
378 raw3215_next_io(raw, tty);
379 if (dstat & 0x01) { /* we got a unit exception */
380 dstat &= ~0x01; /* we can ignore it */
381 }
382 switch (dstat) {
383 case 0x80:
384 if (cstat != 0)
385 break;
386 /* Attention interrupt, someone hit the enter key */
387 raw3215_mk_read_req(raw);
388 raw3215_next_io(raw, tty);
389 break;
390 case 0x08:
391 case 0x0C:
392 /* Channel end interrupt. */
393 if ((raw = req->info) == NULL)
394 goto put_tty; /* That shouldn't happen ... */
395 if (req->type == RAW3215_READ) {
396 /* store residual count, then wait for device end */
397 req->residual = irb->scsw.cmd.count;
398 }
399 if (dstat == 0x08)
400 break;
401 case 0x04:
402 /* Device end interrupt. */
403 if ((raw = req->info) == NULL)
404 goto put_tty; /* That shouldn't happen ... */
405 if (req->type == RAW3215_READ && tty != NULL) {
406 unsigned int cchar;
407
408 count = 160 - req->residual;
409 EBCASC(raw->inbuf, count);
410 cchar = ctrlchar_handle(raw->inbuf, count, tty);
411 switch (cchar & CTRLCHAR_MASK) {
412 case CTRLCHAR_SYSRQ:
413 break;
414
415 case CTRLCHAR_CTRL:
416 tty_insert_flip_char(&raw->port, cchar,
417 TTY_NORMAL);
418 tty_flip_buffer_push(&raw->port);
419 break;
420
421 case CTRLCHAR_NONE:
422 if (count < 2 ||
423 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
424 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
425 /* add the auto \n */
426 raw->inbuf[count] = '\n';
427 count++;
428 } else
429 count -= 2;
430 tty_insert_flip_string(&raw->port, raw->inbuf,
431 count);
432 tty_flip_buffer_push(&raw->port);
433 break;
434 }
435 } else if (req->type == RAW3215_WRITE) {
436 raw->count -= req->len;
437 raw->written -= req->len;
438 }
439 raw->flags &= ~RAW3215_WORKING;
440 raw3215_free_req(req);
441 /* check for empty wait */
442 if (waitqueue_active(&raw->empty_wait) &&
443 raw->queued_write == NULL &&
444 raw->queued_read == NULL) {
445 wake_up_interruptible(&raw->empty_wait);
446 }
447 raw3215_next_io(raw, tty);
448 break;
449 default:
450 /* Strange interrupt, I'll do my best to clean up */
451 if (req != NULL && req->type != RAW3215_FREE) {
452 if (req->type == RAW3215_WRITE) {
453 raw->count -= req->len;
454 raw->written -= req->len;
455 }
456 raw->flags &= ~RAW3215_WORKING;
457 raw3215_free_req(req);
458 }
459 raw3215_next_io(raw, tty);
460 }
461 put_tty:
462 tty_kref_put(tty);
463 }
464
465 /*
466 * Drop the oldest line from the output buffer.
467 */
raw3215_drop_line(struct raw3215_info * raw)468 static void raw3215_drop_line(struct raw3215_info *raw)
469 {
470 int ix;
471 char ch;
472
473 BUG_ON(raw->written != 0);
474 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
475 while (raw->count > 0) {
476 ch = raw->buffer[ix];
477 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
478 raw->count--;
479 if (ch == 0x15)
480 break;
481 }
482 raw->head = ix;
483 }
484
485 /*
486 * Wait until length bytes are available int the output buffer.
487 * Has to be called with the s390irq lock held. Can be called
488 * disabled.
489 */
raw3215_make_room(struct raw3215_info * raw,unsigned int length)490 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
491 {
492 while (RAW3215_BUFFER_SIZE - raw->count < length) {
493 /* While console is frozen for suspend we have no other
494 * choice but to drop message from the buffer to make
495 * room for even more messages. */
496 if (tty_port_suspended(&raw->port)) {
497 raw3215_drop_line(raw);
498 continue;
499 }
500 /* there might be a request pending */
501 raw->flags |= RAW3215_FLUSHING;
502 raw3215_mk_write_req(raw);
503 raw3215_try_io(raw);
504 raw->flags &= ~RAW3215_FLUSHING;
505 #ifdef CONFIG_TN3215_CONSOLE
506 ccw_device_wait_idle(raw->cdev);
507 #endif
508 /* Enough room freed up ? */
509 if (RAW3215_BUFFER_SIZE - raw->count >= length)
510 break;
511 /* there might be another cpu waiting for the lock */
512 spin_unlock(get_ccwdev_lock(raw->cdev));
513 udelay(100);
514 spin_lock(get_ccwdev_lock(raw->cdev));
515 }
516 }
517
518 /*
519 * String write routine for 3215 devices
520 */
raw3215_write(struct raw3215_info * raw,const char * str,unsigned int length)521 static void raw3215_write(struct raw3215_info *raw, const char *str,
522 unsigned int length)
523 {
524 unsigned long flags;
525 int c, count;
526
527 while (length > 0) {
528 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
529 count = (length > RAW3215_BUFFER_SIZE) ?
530 RAW3215_BUFFER_SIZE : length;
531 length -= count;
532
533 raw3215_make_room(raw, count);
534
535 /* copy string to output buffer and convert it to EBCDIC */
536 while (1) {
537 c = min_t(int, count,
538 min(RAW3215_BUFFER_SIZE - raw->count,
539 RAW3215_BUFFER_SIZE - raw->head));
540 if (c <= 0)
541 break;
542 memcpy(raw->buffer + raw->head, str, c);
543 ASCEBC(raw->buffer + raw->head, c);
544 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
545 raw->count += c;
546 raw->line_pos += c;
547 str += c;
548 count -= c;
549 }
550 if (!(raw->flags & RAW3215_WORKING)) {
551 raw3215_mk_write_req(raw);
552 /* start or queue request */
553 raw3215_try_io(raw);
554 }
555 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
556 }
557 }
558
559 /*
560 * Put character routine for 3215 devices
561 */
raw3215_putchar(struct raw3215_info * raw,unsigned char ch)562 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
563 {
564 unsigned long flags;
565 unsigned int length, i;
566
567 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
568 if (ch == '\t') {
569 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
570 raw->line_pos += length;
571 ch = ' ';
572 } else if (ch == '\n') {
573 length = 1;
574 raw->line_pos = 0;
575 } else {
576 length = 1;
577 raw->line_pos++;
578 }
579 raw3215_make_room(raw, length);
580
581 for (i = 0; i < length; i++) {
582 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
583 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
584 raw->count++;
585 }
586 if (!(raw->flags & RAW3215_WORKING)) {
587 raw3215_mk_write_req(raw);
588 /* start or queue request */
589 raw3215_try_io(raw);
590 }
591 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
592 }
593
594 /*
595 * Flush routine, it simply sets the flush flag and tries to start
596 * pending IO.
597 */
raw3215_flush_buffer(struct raw3215_info * raw)598 static void raw3215_flush_buffer(struct raw3215_info *raw)
599 {
600 unsigned long flags;
601
602 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
603 if (raw->count > 0) {
604 raw->flags |= RAW3215_FLUSHING;
605 raw3215_try_io(raw);
606 raw->flags &= ~RAW3215_FLUSHING;
607 }
608 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
609 }
610
611 /*
612 * Fire up a 3215 device.
613 */
raw3215_startup(struct raw3215_info * raw)614 static int raw3215_startup(struct raw3215_info *raw)
615 {
616 unsigned long flags;
617
618 if (tty_port_initialized(&raw->port))
619 return 0;
620 raw->line_pos = 0;
621 tty_port_set_initialized(&raw->port, 1);
622 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
623 raw3215_try_io(raw);
624 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
625
626 return 0;
627 }
628
629 /*
630 * Shutdown a 3215 device.
631 */
raw3215_shutdown(struct raw3215_info * raw)632 static void raw3215_shutdown(struct raw3215_info *raw)
633 {
634 DECLARE_WAITQUEUE(wait, current);
635 unsigned long flags;
636
637 if (!tty_port_initialized(&raw->port) || (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 add_wait_queue(&raw->empty_wait, &wait);
645 set_current_state(TASK_INTERRUPTIBLE);
646 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
647 schedule();
648 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
649 remove_wait_queue(&raw->empty_wait, &wait);
650 set_current_state(TASK_RUNNING);
651 tty_port_set_initialized(&raw->port, 1);
652 }
653 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
654 }
655
raw3215_alloc_info(void)656 static struct raw3215_info *raw3215_alloc_info(void)
657 {
658 struct raw3215_info *info;
659
660 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
661 if (!info)
662 return NULL;
663
664 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
665 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
666 if (!info->buffer || !info->inbuf) {
667 kfree(info->inbuf);
668 kfree(info->buffer);
669 kfree(info);
670 return NULL;
671 }
672
673 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
674 init_waitqueue_head(&info->empty_wait);
675 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
676 tty_port_init(&info->port);
677
678 return info;
679 }
680
raw3215_free_info(struct raw3215_info * raw)681 static void raw3215_free_info(struct raw3215_info *raw)
682 {
683 kfree(raw->inbuf);
684 kfree(raw->buffer);
685 tty_port_destroy(&raw->port);
686 kfree(raw);
687 }
688
raw3215_probe(struct ccw_device * cdev)689 static int raw3215_probe (struct ccw_device *cdev)
690 {
691 struct raw3215_info *raw;
692 int line;
693
694 /* Console is special. */
695 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
696 return 0;
697
698 raw = raw3215_alloc_info();
699 if (raw == NULL)
700 return -ENOMEM;
701
702 raw->cdev = cdev;
703 dev_set_drvdata(&cdev->dev, raw);
704 cdev->handler = raw3215_irq;
705
706 spin_lock(&raw3215_device_lock);
707 for (line = 0; line < NR_3215; line++) {
708 if (!raw3215[line]) {
709 raw3215[line] = raw;
710 break;
711 }
712 }
713 spin_unlock(&raw3215_device_lock);
714 if (line == NR_3215) {
715 raw3215_free_info(raw);
716 return -ENODEV;
717 }
718
719 return 0;
720 }
721
raw3215_remove(struct ccw_device * cdev)722 static void raw3215_remove (struct ccw_device *cdev)
723 {
724 struct raw3215_info *raw;
725 unsigned int line;
726
727 ccw_device_set_offline(cdev);
728 raw = dev_get_drvdata(&cdev->dev);
729 if (raw) {
730 spin_lock(&raw3215_device_lock);
731 for (line = 0; line < NR_3215; line++)
732 if (raw3215[line] == raw)
733 break;
734 raw3215[line] = NULL;
735 spin_unlock(&raw3215_device_lock);
736 dev_set_drvdata(&cdev->dev, NULL);
737 raw3215_free_info(raw);
738 }
739 }
740
raw3215_set_online(struct ccw_device * cdev)741 static int raw3215_set_online (struct ccw_device *cdev)
742 {
743 struct raw3215_info *raw;
744
745 raw = dev_get_drvdata(&cdev->dev);
746 if (!raw)
747 return -ENODEV;
748
749 return raw3215_startup(raw);
750 }
751
raw3215_set_offline(struct ccw_device * cdev)752 static int raw3215_set_offline (struct ccw_device *cdev)
753 {
754 struct raw3215_info *raw;
755
756 raw = dev_get_drvdata(&cdev->dev);
757 if (!raw)
758 return -ENODEV;
759
760 raw3215_shutdown(raw);
761
762 return 0;
763 }
764
raw3215_pm_stop(struct ccw_device * cdev)765 static int raw3215_pm_stop(struct ccw_device *cdev)
766 {
767 struct raw3215_info *raw;
768 unsigned long flags;
769
770 /* Empty the output buffer, then prevent new I/O. */
771 raw = dev_get_drvdata(&cdev->dev);
772 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
773 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
774 tty_port_set_suspended(&raw->port, 1);
775 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
776 return 0;
777 }
778
raw3215_pm_start(struct ccw_device * cdev)779 static int raw3215_pm_start(struct ccw_device *cdev)
780 {
781 struct raw3215_info *raw;
782 unsigned long flags;
783
784 /* Allow I/O again and flush output buffer. */
785 raw = dev_get_drvdata(&cdev->dev);
786 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
787 tty_port_set_suspended(&raw->port, 0);
788 raw->flags |= RAW3215_FLUSHING;
789 raw3215_try_io(raw);
790 raw->flags &= ~RAW3215_FLUSHING;
791 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
792 return 0;
793 }
794
795 static struct ccw_device_id raw3215_id[] = {
796 { CCW_DEVICE(0x3215, 0) },
797 { /* end of list */ },
798 };
799
800 static struct ccw_driver raw3215_ccw_driver = {
801 .driver = {
802 .name = "3215",
803 .owner = THIS_MODULE,
804 },
805 .ids = raw3215_id,
806 .probe = &raw3215_probe,
807 .remove = &raw3215_remove,
808 .set_online = &raw3215_set_online,
809 .set_offline = &raw3215_set_offline,
810 .freeze = &raw3215_pm_stop,
811 .thaw = &raw3215_pm_start,
812 .restore = &raw3215_pm_start,
813 .int_class = IRQIO_C15,
814 };
815
816 #ifdef CONFIG_TN3215_CONSOLE
817 /*
818 * Write a string to the 3215 console
819 */
con3215_write(struct console * co,const char * str,unsigned int count)820 static void con3215_write(struct console *co, const char *str,
821 unsigned int count)
822 {
823 struct raw3215_info *raw;
824 int i;
825
826 if (count <= 0)
827 return;
828 raw = raw3215[0]; /* console 3215 is the first one */
829 while (count > 0) {
830 for (i = 0; i < count; i++)
831 if (str[i] == '\t' || str[i] == '\n')
832 break;
833 raw3215_write(raw, str, i);
834 count -= i;
835 str += i;
836 if (count > 0) {
837 raw3215_putchar(raw, *str);
838 count--;
839 str++;
840 }
841 }
842 }
843
con3215_device(struct console * c,int * index)844 static struct tty_driver *con3215_device(struct console *c, int *index)
845 {
846 *index = c->index;
847 return tty3215_driver;
848 }
849
850 /*
851 * panic() calls con3215_flush through a panic_notifier
852 * before the system enters a disabled, endless loop.
853 */
con3215_flush(void)854 static void con3215_flush(void)
855 {
856 struct raw3215_info *raw;
857 unsigned long flags;
858
859 raw = raw3215[0]; /* console 3215 is the first one */
860 if (tty_port_suspended(&raw->port))
861 /* The console is still frozen for suspend. */
862 if (ccw_device_force_console(raw->cdev))
863 /* Forcing didn't work, no panic message .. */
864 return;
865 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
866 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
867 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
868 }
869
con3215_notify(struct notifier_block * self,unsigned long event,void * data)870 static int con3215_notify(struct notifier_block *self,
871 unsigned long event, void *data)
872 {
873 con3215_flush();
874 return NOTIFY_OK;
875 }
876
877 static struct notifier_block on_panic_nb = {
878 .notifier_call = con3215_notify,
879 .priority = 0,
880 };
881
882 static struct notifier_block on_reboot_nb = {
883 .notifier_call = con3215_notify,
884 .priority = 0,
885 };
886
887 /*
888 * The console structure for the 3215 console
889 */
890 static struct console con3215 = {
891 .name = "ttyS",
892 .write = con3215_write,
893 .device = con3215_device,
894 .flags = CON_PRINTBUFFER,
895 };
896
897 /*
898 * 3215 console initialization code called from console_init().
899 */
con3215_init(void)900 static int __init con3215_init(void)
901 {
902 struct ccw_device *cdev;
903 struct raw3215_info *raw;
904 struct raw3215_req *req;
905 int i;
906
907 /* Check if 3215 is to be the console */
908 if (!CONSOLE_IS_3215)
909 return -ENODEV;
910
911 /* Set the console mode for VM */
912 if (MACHINE_IS_VM) {
913 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
914 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
915 }
916
917 /* allocate 3215 request structures */
918 raw3215_freelist = NULL;
919 spin_lock_init(&raw3215_freelist_lock);
920 for (i = 0; i < NR_3215_REQ; i++) {
921 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
922 if (!req)
923 return -ENOMEM;
924 req->next = raw3215_freelist;
925 raw3215_freelist = req;
926 }
927
928 cdev = ccw_device_create_console(&raw3215_ccw_driver);
929 if (IS_ERR(cdev))
930 return -ENODEV;
931
932 raw3215[0] = raw = raw3215_alloc_info();
933 raw->cdev = cdev;
934 dev_set_drvdata(&cdev->dev, raw);
935 cdev->handler = raw3215_irq;
936
937 raw->flags |= RAW3215_FIXED;
938 if (ccw_device_enable_console(cdev)) {
939 ccw_device_destroy_console(cdev);
940 raw3215_free_info(raw);
941 raw3215[0] = NULL;
942 return -ENODEV;
943 }
944
945 /* Request the console irq */
946 if (raw3215_startup(raw) != 0) {
947 raw3215_free_info(raw);
948 raw3215[0] = NULL;
949 return -ENODEV;
950 }
951 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
952 register_reboot_notifier(&on_reboot_nb);
953 register_console(&con3215);
954 return 0;
955 }
956 console_initcall(con3215_init);
957 #endif
958
tty3215_install(struct tty_driver * driver,struct tty_struct * tty)959 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
960 {
961 struct raw3215_info *raw;
962
963 raw = raw3215[tty->index];
964 if (raw == NULL)
965 return -ENODEV;
966
967 tty->driver_data = raw;
968
969 return tty_port_install(&raw->port, driver, tty);
970 }
971
972 /*
973 * tty3215_open
974 *
975 * This routine is called whenever a 3215 tty is opened.
976 */
tty3215_open(struct tty_struct * tty,struct file * filp)977 static int tty3215_open(struct tty_struct *tty, struct file * filp)
978 {
979 struct raw3215_info *raw = tty->driver_data;
980 int retval;
981
982 tty_port_tty_set(&raw->port, tty);
983
984 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
985 /*
986 * Start up 3215 device
987 */
988 retval = raw3215_startup(raw);
989 if (retval)
990 return retval;
991
992 return 0;
993 }
994
995 /*
996 * tty3215_close()
997 *
998 * This routine is called when the 3215 tty is closed. We wait
999 * for the remaining request to be completed. Then we clean up.
1000 */
tty3215_close(struct tty_struct * tty,struct file * filp)1001 static void tty3215_close(struct tty_struct *tty, struct file * filp)
1002 {
1003 struct raw3215_info *raw;
1004
1005 raw = (struct raw3215_info *) tty->driver_data;
1006 if (raw == NULL || tty->count > 1)
1007 return;
1008 tty->closing = 1;
1009 /* Shutdown the terminal */
1010 raw3215_shutdown(raw);
1011 tasklet_kill(&raw->tlet);
1012 tty->closing = 0;
1013 tty_port_tty_set(&raw->port, NULL);
1014 }
1015
1016 /*
1017 * Returns the amount of free space in the output buffer.
1018 */
tty3215_write_room(struct tty_struct * tty)1019 static int tty3215_write_room(struct tty_struct *tty)
1020 {
1021 struct raw3215_info *raw;
1022
1023 raw = (struct raw3215_info *) tty->driver_data;
1024
1025 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1026 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1027 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1028 else
1029 return 0;
1030 }
1031
1032 /*
1033 * String write routine for 3215 ttys
1034 */
tty3215_write(struct tty_struct * tty,const unsigned char * buf,int count)1035 static int tty3215_write(struct tty_struct * tty,
1036 const unsigned char *buf, int count)
1037 {
1038 struct raw3215_info *raw;
1039 int i, written;
1040
1041 if (!tty)
1042 return 0;
1043 raw = (struct raw3215_info *) tty->driver_data;
1044 written = count;
1045 while (count > 0) {
1046 for (i = 0; i < count; i++)
1047 if (buf[i] == '\t' || buf[i] == '\n')
1048 break;
1049 raw3215_write(raw, buf, i);
1050 count -= i;
1051 buf += i;
1052 if (count > 0) {
1053 raw3215_putchar(raw, *buf);
1054 count--;
1055 buf++;
1056 }
1057 }
1058 return written;
1059 }
1060
1061 /*
1062 * Put character routine for 3215 ttys
1063 */
tty3215_put_char(struct tty_struct * tty,unsigned char ch)1064 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1065 {
1066 struct raw3215_info *raw;
1067
1068 if (!tty)
1069 return 0;
1070 raw = (struct raw3215_info *) tty->driver_data;
1071 raw3215_putchar(raw, ch);
1072 return 1;
1073 }
1074
tty3215_flush_chars(struct tty_struct * tty)1075 static void tty3215_flush_chars(struct tty_struct *tty)
1076 {
1077 }
1078
1079 /*
1080 * Returns the number of characters in the output buffer
1081 */
tty3215_chars_in_buffer(struct tty_struct * tty)1082 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1083 {
1084 struct raw3215_info *raw;
1085
1086 raw = (struct raw3215_info *) tty->driver_data;
1087 return raw->count;
1088 }
1089
tty3215_flush_buffer(struct tty_struct * tty)1090 static void tty3215_flush_buffer(struct tty_struct *tty)
1091 {
1092 struct raw3215_info *raw;
1093
1094 raw = (struct raw3215_info *) tty->driver_data;
1095 raw3215_flush_buffer(raw);
1096 tty_wakeup(tty);
1097 }
1098
1099 /*
1100 * Disable reading from a 3215 tty
1101 */
tty3215_throttle(struct tty_struct * tty)1102 static void tty3215_throttle(struct tty_struct * tty)
1103 {
1104 struct raw3215_info *raw;
1105
1106 raw = (struct raw3215_info *) tty->driver_data;
1107 raw->flags |= RAW3215_THROTTLED;
1108 }
1109
1110 /*
1111 * Enable reading from a 3215 tty
1112 */
tty3215_unthrottle(struct tty_struct * tty)1113 static void tty3215_unthrottle(struct tty_struct * tty)
1114 {
1115 struct raw3215_info *raw;
1116 unsigned long flags;
1117
1118 raw = (struct raw3215_info *) tty->driver_data;
1119 if (raw->flags & RAW3215_THROTTLED) {
1120 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1121 raw->flags &= ~RAW3215_THROTTLED;
1122 raw3215_try_io(raw);
1123 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1124 }
1125 }
1126
1127 /*
1128 * Disable writing to a 3215 tty
1129 */
tty3215_stop(struct tty_struct * tty)1130 static void tty3215_stop(struct tty_struct *tty)
1131 {
1132 struct raw3215_info *raw;
1133
1134 raw = (struct raw3215_info *) tty->driver_data;
1135 raw->flags |= RAW3215_STOPPED;
1136 }
1137
1138 /*
1139 * Enable writing to a 3215 tty
1140 */
tty3215_start(struct tty_struct * tty)1141 static void tty3215_start(struct tty_struct *tty)
1142 {
1143 struct raw3215_info *raw;
1144 unsigned long flags;
1145
1146 raw = (struct raw3215_info *) tty->driver_data;
1147 if (raw->flags & RAW3215_STOPPED) {
1148 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1149 raw->flags &= ~RAW3215_STOPPED;
1150 raw3215_try_io(raw);
1151 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1152 }
1153 }
1154
1155 static const struct tty_operations tty3215_ops = {
1156 .install = tty3215_install,
1157 .open = tty3215_open,
1158 .close = tty3215_close,
1159 .write = tty3215_write,
1160 .put_char = tty3215_put_char,
1161 .flush_chars = tty3215_flush_chars,
1162 .write_room = tty3215_write_room,
1163 .chars_in_buffer = tty3215_chars_in_buffer,
1164 .flush_buffer = tty3215_flush_buffer,
1165 .throttle = tty3215_throttle,
1166 .unthrottle = tty3215_unthrottle,
1167 .stop = tty3215_stop,
1168 .start = tty3215_start,
1169 };
1170
1171 /*
1172 * 3215 tty registration code called from tty_init().
1173 * Most kernel services (incl. kmalloc) are available at this poimt.
1174 */
tty3215_init(void)1175 static int __init tty3215_init(void)
1176 {
1177 struct tty_driver *driver;
1178 int ret;
1179
1180 if (!CONSOLE_IS_3215)
1181 return 0;
1182
1183 driver = alloc_tty_driver(NR_3215);
1184 if (!driver)
1185 return -ENOMEM;
1186
1187 ret = ccw_driver_register(&raw3215_ccw_driver);
1188 if (ret) {
1189 put_tty_driver(driver);
1190 return ret;
1191 }
1192 /*
1193 * Initialize the tty_driver structure
1194 * Entries in tty3215_driver that are NOT initialized:
1195 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1196 */
1197
1198 driver->driver_name = "tty3215";
1199 driver->name = "ttyS";
1200 driver->major = TTY_MAJOR;
1201 driver->minor_start = 64;
1202 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1203 driver->subtype = SYSTEM_TYPE_TTY;
1204 driver->init_termios = tty_std_termios;
1205 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1206 driver->init_termios.c_oflag = ONLCR;
1207 driver->init_termios.c_lflag = ISIG;
1208 driver->flags = TTY_DRIVER_REAL_RAW;
1209 tty_set_operations(driver, &tty3215_ops);
1210 ret = tty_register_driver(driver);
1211 if (ret) {
1212 put_tty_driver(driver);
1213 return ret;
1214 }
1215 tty3215_driver = driver;
1216 return 0;
1217 }
1218
tty3215_exit(void)1219 static void __exit tty3215_exit(void)
1220 {
1221 tty_unregister_driver(tty3215_driver);
1222 put_tty_driver(tty3215_driver);
1223 ccw_driver_unregister(&raw3215_ccw_driver);
1224 }
1225
1226 module_init(tty3215_init);
1227 module_exit(tty3215_exit);
1228