1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * 3215 line mode terminal driver.
4 *
5 * Copyright IBM Corp. 1999, 2009
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 *
8 * Updated:
9 * Aug-2000: Added tab support
10 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
11 */
12
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/panic_notifier.h>
23 #include <linux/reboot.h>
24 #include <linux/serial.h> /* ASYNC_* flags */
25 #include <linux/slab.h>
26 #include <asm/ccwdev.h>
27 #include <asm/cio.h>
28 #include <asm/io.h>
29 #include <asm/ebcdic.h>
30 #include <linux/uaccess.h>
31 #include <asm/delay.h>
32 #include <asm/cpcmd.h>
33 #include <asm/setup.h>
34
35 #include "ctrlchar.h"
36
37 #define NR_3215 1
38 #define NR_3215_REQ (4*NR_3215)
39 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
40 #define RAW3215_INBUF_SIZE 256 /* input buffer size */
41 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
42 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
43 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
44 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
45 #define RAW3215_NR_CCWS 3
46 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
47
48 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */
49 #define RAW3215_WORKING 4 /* set if a request is being worked on */
50 #define RAW3215_THROTTLED 8 /* set if reading is disabled */
51 #define RAW3215_STOPPED 16 /* set if writing is disabled */
52 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
53 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
54
55 #define TAB_STOP_SIZE 8 /* tab stop size */
56
57 /*
58 * Request types for a 3215 device
59 */
60 enum raw3215_type {
61 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
62 };
63
64 /*
65 * Request structure for a 3215 device
66 */
67 struct raw3215_req {
68 enum raw3215_type type; /* type of the request */
69 int start, len; /* start index & len in output buffer */
70 int delayable; /* indication to wait for more data */
71 int residual; /* residual count for read request */
72 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
73 struct raw3215_info *info; /* pointer to main structure */
74 struct raw3215_req *next; /* pointer to next request */
75 } __attribute__ ((aligned(8)));
76
77 struct raw3215_info {
78 struct tty_port port;
79 struct ccw_device *cdev; /* device for tty driver */
80 spinlock_t *lock; /* pointer to irq lock */
81 int flags; /* state flags */
82 char *buffer; /* pointer to output buffer */
83 char *inbuf; /* pointer to input buffer */
84 int head; /* first free byte in output buffer */
85 int count; /* number of bytes in output buffer */
86 int written; /* number of bytes in write requests */
87 struct raw3215_req *queued_read; /* pointer to queued read requests */
88 struct raw3215_req *queued_write;/* pointer to queued write requests */
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 DEFINE_SPINLOCK(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(struct timer_list * t)285 static void raw3215_timeout(struct timer_list *t)
286 {
287 struct raw3215_info *raw = from_timer(raw, t, timer);
288 unsigned long flags;
289
290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
291 raw->flags &= ~RAW3215_TIMER_RUNS;
292 raw3215_mk_write_req(raw);
293 raw3215_start_io(raw);
294 if ((raw->queued_read || raw->queued_write) &&
295 !(raw->flags & RAW3215_WORKING) &&
296 !(raw->flags & RAW3215_TIMER_RUNS)) {
297 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
298 add_timer(&raw->timer);
299 raw->flags |= RAW3215_TIMER_RUNS;
300 }
301 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
302 }
303
304 /*
305 * Function to conditionally start an IO. A read is started immediately,
306 * a write is only started immediately if the flush flag is on or the
307 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
308 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
309 */
raw3215_try_io(struct raw3215_info * raw)310 static inline void raw3215_try_io(struct raw3215_info *raw)
311 {
312 if (!tty_port_initialized(&raw->port))
313 return;
314 if (raw->queued_read != NULL)
315 raw3215_start_io(raw);
316 else if (raw->queued_write != NULL) {
317 if ((raw->queued_write->delayable == 0) ||
318 (raw->flags & RAW3215_FLUSHING)) {
319 /* execute write requests bigger than minimum size */
320 raw3215_start_io(raw);
321 }
322 }
323 if ((raw->queued_read || raw->queued_write) &&
324 !(raw->flags & RAW3215_WORKING) &&
325 !(raw->flags & RAW3215_TIMER_RUNS)) {
326 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
327 add_timer(&raw->timer);
328 raw->flags |= RAW3215_TIMER_RUNS;
329 }
330 }
331
332 /*
333 * Try to start the next IO and wake up processes waiting on the tty.
334 */
raw3215_next_io(struct raw3215_info * raw,struct tty_struct * tty)335 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
336 {
337 raw3215_mk_write_req(raw);
338 raw3215_try_io(raw);
339 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
340 tty_wakeup(tty);
341 }
342
343 /*
344 * Interrupt routine, called from common io layer
345 */
raw3215_irq(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)346 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
347 struct irb *irb)
348 {
349 struct raw3215_info *raw;
350 struct raw3215_req *req;
351 struct tty_struct *tty;
352 int cstat, dstat;
353 int count;
354
355 raw = dev_get_drvdata(&cdev->dev);
356 req = (struct raw3215_req *) intparm;
357 tty = tty_port_tty_get(&raw->port);
358 cstat = irb->scsw.cmd.cstat;
359 dstat = irb->scsw.cmd.dstat;
360 if (cstat != 0)
361 raw3215_next_io(raw, tty);
362 if (dstat & 0x01) { /* we got a unit exception */
363 dstat &= ~0x01; /* we can ignore it */
364 }
365 switch (dstat) {
366 case 0x80:
367 if (cstat != 0)
368 break;
369 /* Attention interrupt, someone hit the enter key */
370 raw3215_mk_read_req(raw);
371 raw3215_next_io(raw, tty);
372 break;
373 case 0x08:
374 case 0x0C:
375 /* Channel end interrupt. */
376 if ((raw = req->info) == NULL)
377 goto put_tty; /* That shouldn't happen ... */
378 if (req->type == RAW3215_READ) {
379 /* store residual count, then wait for device end */
380 req->residual = irb->scsw.cmd.count;
381 }
382 if (dstat == 0x08)
383 break;
384 fallthrough;
385 case 0x04:
386 /* Device end interrupt. */
387 if ((raw = req->info) == NULL)
388 goto put_tty; /* That shouldn't happen ... */
389 if (req->type == RAW3215_READ && tty != NULL) {
390 unsigned int cchar;
391
392 count = 160 - req->residual;
393 EBCASC(raw->inbuf, count);
394 cchar = ctrlchar_handle(raw->inbuf, count, tty);
395 switch (cchar & CTRLCHAR_MASK) {
396 case CTRLCHAR_SYSRQ:
397 break;
398
399 case CTRLCHAR_CTRL:
400 tty_insert_flip_char(&raw->port, cchar,
401 TTY_NORMAL);
402 tty_flip_buffer_push(&raw->port);
403 break;
404
405 case CTRLCHAR_NONE:
406 if (count < 2 ||
407 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
408 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
409 /* add the auto \n */
410 raw->inbuf[count] = '\n';
411 count++;
412 } else
413 count -= 2;
414 tty_insert_flip_string(&raw->port, raw->inbuf,
415 count);
416 tty_flip_buffer_push(&raw->port);
417 break;
418 }
419 } else if (req->type == RAW3215_WRITE) {
420 raw->count -= req->len;
421 raw->written -= req->len;
422 }
423 raw->flags &= ~RAW3215_WORKING;
424 raw3215_free_req(req);
425 /* check for empty wait */
426 if (waitqueue_active(&raw->empty_wait) &&
427 raw->queued_write == NULL &&
428 raw->queued_read == NULL) {
429 wake_up_interruptible(&raw->empty_wait);
430 }
431 raw3215_next_io(raw, tty);
432 break;
433 default:
434 /* Strange interrupt, I'll do my best to clean up */
435 if (req != NULL && req->type != RAW3215_FREE) {
436 if (req->type == RAW3215_WRITE) {
437 raw->count -= req->len;
438 raw->written -= req->len;
439 }
440 raw->flags &= ~RAW3215_WORKING;
441 raw3215_free_req(req);
442 }
443 raw3215_next_io(raw, tty);
444 }
445 put_tty:
446 tty_kref_put(tty);
447 }
448
449 /*
450 * Wait until length bytes are available int the output buffer.
451 * Has to be called with the s390irq lock held. Can be called
452 * disabled.
453 */
raw3215_make_room(struct raw3215_info * raw,unsigned int length)454 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
455 {
456 while (RAW3215_BUFFER_SIZE - raw->count < length) {
457 /* there might be a request pending */
458 raw->flags |= RAW3215_FLUSHING;
459 raw3215_mk_write_req(raw);
460 raw3215_try_io(raw);
461 raw->flags &= ~RAW3215_FLUSHING;
462 #ifdef CONFIG_TN3215_CONSOLE
463 ccw_device_wait_idle(raw->cdev);
464 #endif
465 /* Enough room freed up ? */
466 if (RAW3215_BUFFER_SIZE - raw->count >= length)
467 break;
468 /* there might be another cpu waiting for the lock */
469 spin_unlock(get_ccwdev_lock(raw->cdev));
470 udelay(100);
471 spin_lock(get_ccwdev_lock(raw->cdev));
472 }
473 }
474
475 /*
476 * String write routine for 3215 devices
477 */
raw3215_write(struct raw3215_info * raw,const char * str,unsigned int length)478 static void raw3215_write(struct raw3215_info *raw, const char *str,
479 unsigned int length)
480 {
481 unsigned long flags;
482 int c, count;
483
484 while (length > 0) {
485 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
486 count = (length > RAW3215_BUFFER_SIZE) ?
487 RAW3215_BUFFER_SIZE : length;
488 length -= count;
489
490 raw3215_make_room(raw, count);
491
492 /* copy string to output buffer and convert it to EBCDIC */
493 while (1) {
494 c = min_t(int, count,
495 min(RAW3215_BUFFER_SIZE - raw->count,
496 RAW3215_BUFFER_SIZE - raw->head));
497 if (c <= 0)
498 break;
499 memcpy(raw->buffer + raw->head, str, c);
500 ASCEBC(raw->buffer + raw->head, c);
501 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
502 raw->count += c;
503 raw->line_pos += c;
504 str += c;
505 count -= c;
506 }
507 if (!(raw->flags & RAW3215_WORKING)) {
508 raw3215_mk_write_req(raw);
509 /* start or queue request */
510 raw3215_try_io(raw);
511 }
512 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
513 }
514 }
515
516 /*
517 * Put character routine for 3215 devices
518 */
raw3215_putchar(struct raw3215_info * raw,unsigned char ch)519 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
520 {
521 unsigned long flags;
522 unsigned int length, i;
523
524 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
525 if (ch == '\t') {
526 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
527 raw->line_pos += length;
528 ch = ' ';
529 } else if (ch == '\n') {
530 length = 1;
531 raw->line_pos = 0;
532 } else {
533 length = 1;
534 raw->line_pos++;
535 }
536 raw3215_make_room(raw, length);
537
538 for (i = 0; i < length; i++) {
539 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
540 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
541 raw->count++;
542 }
543 if (!(raw->flags & RAW3215_WORKING)) {
544 raw3215_mk_write_req(raw);
545 /* start or queue request */
546 raw3215_try_io(raw);
547 }
548 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
549 }
550
551 /*
552 * Flush routine, it simply sets the flush flag and tries to start
553 * pending IO.
554 */
raw3215_flush_buffer(struct raw3215_info * raw)555 static void raw3215_flush_buffer(struct raw3215_info *raw)
556 {
557 unsigned long flags;
558
559 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
560 if (raw->count > 0) {
561 raw->flags |= RAW3215_FLUSHING;
562 raw3215_try_io(raw);
563 raw->flags &= ~RAW3215_FLUSHING;
564 }
565 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
566 }
567
568 /*
569 * Fire up a 3215 device.
570 */
raw3215_startup(struct raw3215_info * raw)571 static int raw3215_startup(struct raw3215_info *raw)
572 {
573 unsigned long flags;
574
575 if (tty_port_initialized(&raw->port))
576 return 0;
577 raw->line_pos = 0;
578 tty_port_set_initialized(&raw->port, 1);
579 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
580 raw3215_try_io(raw);
581 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
582
583 return 0;
584 }
585
586 /*
587 * Shutdown a 3215 device.
588 */
raw3215_shutdown(struct raw3215_info * raw)589 static void raw3215_shutdown(struct raw3215_info *raw)
590 {
591 DECLARE_WAITQUEUE(wait, current);
592 unsigned long flags;
593
594 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))
595 return;
596 /* Wait for outstanding requests, then free irq */
597 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
598 if ((raw->flags & RAW3215_WORKING) ||
599 raw->queued_write != NULL ||
600 raw->queued_read != NULL) {
601 add_wait_queue(&raw->empty_wait, &wait);
602 set_current_state(TASK_INTERRUPTIBLE);
603 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
604 schedule();
605 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
606 remove_wait_queue(&raw->empty_wait, &wait);
607 set_current_state(TASK_RUNNING);
608 tty_port_set_initialized(&raw->port, 1);
609 }
610 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
611 }
612
raw3215_alloc_info(void)613 static struct raw3215_info *raw3215_alloc_info(void)
614 {
615 struct raw3215_info *info;
616
617 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
618 if (!info)
619 return NULL;
620
621 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
622 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
623 if (!info->buffer || !info->inbuf) {
624 kfree(info->inbuf);
625 kfree(info->buffer);
626 kfree(info);
627 return NULL;
628 }
629
630 timer_setup(&info->timer, raw3215_timeout, 0);
631 init_waitqueue_head(&info->empty_wait);
632 tty_port_init(&info->port);
633
634 return info;
635 }
636
raw3215_free_info(struct raw3215_info * raw)637 static void raw3215_free_info(struct raw3215_info *raw)
638 {
639 kfree(raw->inbuf);
640 kfree(raw->buffer);
641 tty_port_destroy(&raw->port);
642 kfree(raw);
643 }
644
raw3215_probe(struct ccw_device * cdev)645 static int raw3215_probe (struct ccw_device *cdev)
646 {
647 struct raw3215_info *raw;
648 int line;
649
650 /* Console is special. */
651 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
652 return 0;
653
654 raw = raw3215_alloc_info();
655 if (raw == NULL)
656 return -ENOMEM;
657
658 raw->cdev = cdev;
659 dev_set_drvdata(&cdev->dev, raw);
660 cdev->handler = raw3215_irq;
661
662 spin_lock(&raw3215_device_lock);
663 for (line = 0; line < NR_3215; line++) {
664 if (!raw3215[line]) {
665 raw3215[line] = raw;
666 break;
667 }
668 }
669 spin_unlock(&raw3215_device_lock);
670 if (line == NR_3215) {
671 raw3215_free_info(raw);
672 return -ENODEV;
673 }
674
675 return 0;
676 }
677
raw3215_remove(struct ccw_device * cdev)678 static void raw3215_remove (struct ccw_device *cdev)
679 {
680 struct raw3215_info *raw;
681 unsigned int line;
682
683 ccw_device_set_offline(cdev);
684 raw = dev_get_drvdata(&cdev->dev);
685 if (raw) {
686 spin_lock(&raw3215_device_lock);
687 for (line = 0; line < NR_3215; line++)
688 if (raw3215[line] == raw)
689 break;
690 raw3215[line] = NULL;
691 spin_unlock(&raw3215_device_lock);
692 dev_set_drvdata(&cdev->dev, NULL);
693 raw3215_free_info(raw);
694 }
695 }
696
raw3215_set_online(struct ccw_device * cdev)697 static int raw3215_set_online (struct ccw_device *cdev)
698 {
699 struct raw3215_info *raw;
700
701 raw = dev_get_drvdata(&cdev->dev);
702 if (!raw)
703 return -ENODEV;
704
705 return raw3215_startup(raw);
706 }
707
raw3215_set_offline(struct ccw_device * cdev)708 static int raw3215_set_offline (struct ccw_device *cdev)
709 {
710 struct raw3215_info *raw;
711
712 raw = dev_get_drvdata(&cdev->dev);
713 if (!raw)
714 return -ENODEV;
715
716 raw3215_shutdown(raw);
717
718 return 0;
719 }
720
721 static struct ccw_device_id raw3215_id[] = {
722 { CCW_DEVICE(0x3215, 0) },
723 { /* end of list */ },
724 };
725
726 static struct ccw_driver raw3215_ccw_driver = {
727 .driver = {
728 .name = "3215",
729 .owner = THIS_MODULE,
730 },
731 .ids = raw3215_id,
732 .probe = &raw3215_probe,
733 .remove = &raw3215_remove,
734 .set_online = &raw3215_set_online,
735 .set_offline = &raw3215_set_offline,
736 .int_class = IRQIO_C15,
737 };
738
739 #ifdef CONFIG_TN3215_CONSOLE
740 /*
741 * Write a string to the 3215 console
742 */
con3215_write(struct console * co,const char * str,unsigned int count)743 static void con3215_write(struct console *co, const char *str,
744 unsigned int count)
745 {
746 struct raw3215_info *raw;
747 int i;
748
749 if (count <= 0)
750 return;
751 raw = raw3215[0]; /* console 3215 is the first one */
752 while (count > 0) {
753 for (i = 0; i < count; i++)
754 if (str[i] == '\t' || str[i] == '\n')
755 break;
756 raw3215_write(raw, str, i);
757 count -= i;
758 str += i;
759 if (count > 0) {
760 raw3215_putchar(raw, *str);
761 count--;
762 str++;
763 }
764 }
765 }
766
con3215_device(struct console * c,int * index)767 static struct tty_driver *con3215_device(struct console *c, int *index)
768 {
769 *index = c->index;
770 return tty3215_driver;
771 }
772
773 /*
774 * The below function is called as a panic/reboot notifier before the
775 * system enters a disabled, endless loop.
776 *
777 * Notice we must use the spin_trylock() alternative, to prevent lockups
778 * in atomic context (panic routine runs with secondary CPUs, local IRQs
779 * and preemption disabled).
780 */
con3215_notify(struct notifier_block * self,unsigned long event,void * data)781 static int con3215_notify(struct notifier_block *self,
782 unsigned long event, void *data)
783 {
784 struct raw3215_info *raw;
785 unsigned long flags;
786
787 raw = raw3215[0]; /* console 3215 is the first one */
788 if (!spin_trylock_irqsave(get_ccwdev_lock(raw->cdev), flags))
789 return NOTIFY_DONE;
790 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
791 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
792
793 return NOTIFY_DONE;
794 }
795
796 static struct notifier_block on_panic_nb = {
797 .notifier_call = con3215_notify,
798 .priority = INT_MIN + 1, /* run the callback late */
799 };
800
801 static struct notifier_block on_reboot_nb = {
802 .notifier_call = con3215_notify,
803 .priority = INT_MIN + 1, /* run the callback late */
804 };
805
806 /*
807 * The console structure for the 3215 console
808 */
809 static struct console con3215 = {
810 .name = "ttyS",
811 .write = con3215_write,
812 .device = con3215_device,
813 .flags = CON_PRINTBUFFER,
814 };
815
816 /*
817 * 3215 console initialization code called from console_init().
818 */
con3215_init(void)819 static int __init con3215_init(void)
820 {
821 struct ccw_device *cdev;
822 struct raw3215_info *raw;
823 struct raw3215_req *req;
824 int i;
825
826 /* Check if 3215 is to be the console */
827 if (!CONSOLE_IS_3215)
828 return -ENODEV;
829
830 /* Set the console mode for VM */
831 if (MACHINE_IS_VM) {
832 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
833 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
834 }
835
836 /* allocate 3215 request structures */
837 raw3215_freelist = NULL;
838 for (i = 0; i < NR_3215_REQ; i++) {
839 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
840 if (!req)
841 return -ENOMEM;
842 req->next = raw3215_freelist;
843 raw3215_freelist = req;
844 }
845
846 cdev = ccw_device_create_console(&raw3215_ccw_driver);
847 if (IS_ERR(cdev))
848 return -ENODEV;
849
850 raw3215[0] = raw = raw3215_alloc_info();
851 raw->cdev = cdev;
852 dev_set_drvdata(&cdev->dev, raw);
853 cdev->handler = raw3215_irq;
854
855 raw->flags |= RAW3215_FIXED;
856 if (ccw_device_enable_console(cdev)) {
857 ccw_device_destroy_console(cdev);
858 raw3215_free_info(raw);
859 raw3215[0] = NULL;
860 return -ENODEV;
861 }
862
863 /* Request the console irq */
864 if (raw3215_startup(raw) != 0) {
865 raw3215_free_info(raw);
866 raw3215[0] = NULL;
867 return -ENODEV;
868 }
869 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
870 register_reboot_notifier(&on_reboot_nb);
871 register_console(&con3215);
872 return 0;
873 }
874 console_initcall(con3215_init);
875 #endif
876
tty3215_install(struct tty_driver * driver,struct tty_struct * tty)877 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
878 {
879 struct raw3215_info *raw;
880
881 raw = raw3215[tty->index];
882 if (raw == NULL)
883 return -ENODEV;
884
885 tty->driver_data = raw;
886
887 return tty_port_install(&raw->port, driver, tty);
888 }
889
890 /*
891 * tty3215_open
892 *
893 * This routine is called whenever a 3215 tty is opened.
894 */
tty3215_open(struct tty_struct * tty,struct file * filp)895 static int tty3215_open(struct tty_struct *tty, struct file * filp)
896 {
897 struct raw3215_info *raw = tty->driver_data;
898
899 tty_port_tty_set(&raw->port, tty);
900
901 /*
902 * Start up 3215 device
903 */
904 return raw3215_startup(raw);
905 }
906
907 /*
908 * tty3215_close()
909 *
910 * This routine is called when the 3215 tty is closed. We wait
911 * for the remaining request to be completed. Then we clean up.
912 */
tty3215_close(struct tty_struct * tty,struct file * filp)913 static void tty3215_close(struct tty_struct *tty, struct file * filp)
914 {
915 struct raw3215_info *raw = tty->driver_data;
916
917 if (raw == NULL || tty->count > 1)
918 return;
919 tty->closing = 1;
920 /* Shutdown the terminal */
921 raw3215_shutdown(raw);
922 tty->closing = 0;
923 tty_port_tty_set(&raw->port, NULL);
924 }
925
926 /*
927 * Returns the amount of free space in the output buffer.
928 */
tty3215_write_room(struct tty_struct * tty)929 static unsigned int tty3215_write_room(struct tty_struct *tty)
930 {
931 struct raw3215_info *raw = tty->driver_data;
932
933 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
934 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
935 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
936 else
937 return 0;
938 }
939
940 /*
941 * String write routine for 3215 ttys
942 */
tty3215_write(struct tty_struct * tty,const unsigned char * buf,int count)943 static int tty3215_write(struct tty_struct * tty,
944 const unsigned char *buf, int count)
945 {
946 struct raw3215_info *raw = tty->driver_data;
947 int i, written;
948
949 written = count;
950 while (count > 0) {
951 for (i = 0; i < count; i++)
952 if (buf[i] == '\t' || buf[i] == '\n')
953 break;
954 raw3215_write(raw, buf, i);
955 count -= i;
956 buf += i;
957 if (count > 0) {
958 raw3215_putchar(raw, *buf);
959 count--;
960 buf++;
961 }
962 }
963 return written;
964 }
965
966 /*
967 * Put character routine for 3215 ttys
968 */
tty3215_put_char(struct tty_struct * tty,unsigned char ch)969 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
970 {
971 struct raw3215_info *raw = tty->driver_data;
972
973 raw3215_putchar(raw, ch);
974
975 return 1;
976 }
977
tty3215_flush_chars(struct tty_struct * tty)978 static void tty3215_flush_chars(struct tty_struct *tty)
979 {
980 }
981
982 /*
983 * Returns the number of characters in the output buffer
984 */
tty3215_chars_in_buffer(struct tty_struct * tty)985 static unsigned int tty3215_chars_in_buffer(struct tty_struct *tty)
986 {
987 struct raw3215_info *raw = tty->driver_data;
988
989 return raw->count;
990 }
991
tty3215_flush_buffer(struct tty_struct * tty)992 static void tty3215_flush_buffer(struct tty_struct *tty)
993 {
994 struct raw3215_info *raw = tty->driver_data;
995
996 raw3215_flush_buffer(raw);
997 tty_wakeup(tty);
998 }
999
1000 /*
1001 * Disable reading from a 3215 tty
1002 */
tty3215_throttle(struct tty_struct * tty)1003 static void tty3215_throttle(struct tty_struct * tty)
1004 {
1005 struct raw3215_info *raw = tty->driver_data;
1006
1007 raw->flags |= RAW3215_THROTTLED;
1008 }
1009
1010 /*
1011 * Enable reading from a 3215 tty
1012 */
tty3215_unthrottle(struct tty_struct * tty)1013 static void tty3215_unthrottle(struct tty_struct * tty)
1014 {
1015 struct raw3215_info *raw = tty->driver_data;
1016 unsigned long flags;
1017
1018 if (raw->flags & RAW3215_THROTTLED) {
1019 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1020 raw->flags &= ~RAW3215_THROTTLED;
1021 raw3215_try_io(raw);
1022 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1023 }
1024 }
1025
1026 /*
1027 * Disable writing to a 3215 tty
1028 */
tty3215_stop(struct tty_struct * tty)1029 static void tty3215_stop(struct tty_struct *tty)
1030 {
1031 struct raw3215_info *raw = tty->driver_data;
1032
1033 raw->flags |= RAW3215_STOPPED;
1034 }
1035
1036 /*
1037 * Enable writing to a 3215 tty
1038 */
tty3215_start(struct tty_struct * tty)1039 static void tty3215_start(struct tty_struct *tty)
1040 {
1041 struct raw3215_info *raw = tty->driver_data;
1042 unsigned long flags;
1043
1044 if (raw->flags & RAW3215_STOPPED) {
1045 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1046 raw->flags &= ~RAW3215_STOPPED;
1047 raw3215_try_io(raw);
1048 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1049 }
1050 }
1051
1052 static const struct tty_operations tty3215_ops = {
1053 .install = tty3215_install,
1054 .open = tty3215_open,
1055 .close = tty3215_close,
1056 .write = tty3215_write,
1057 .put_char = tty3215_put_char,
1058 .flush_chars = tty3215_flush_chars,
1059 .write_room = tty3215_write_room,
1060 .chars_in_buffer = tty3215_chars_in_buffer,
1061 .flush_buffer = tty3215_flush_buffer,
1062 .throttle = tty3215_throttle,
1063 .unthrottle = tty3215_unthrottle,
1064 .stop = tty3215_stop,
1065 .start = tty3215_start,
1066 };
1067
1068 /*
1069 * 3215 tty registration code called from tty_init().
1070 * Most kernel services (incl. kmalloc) are available at this poimt.
1071 */
tty3215_init(void)1072 static int __init tty3215_init(void)
1073 {
1074 struct tty_driver *driver;
1075 int ret;
1076
1077 if (!CONSOLE_IS_3215)
1078 return 0;
1079
1080 driver = tty_alloc_driver(NR_3215, TTY_DRIVER_REAL_RAW);
1081 if (IS_ERR(driver))
1082 return PTR_ERR(driver);
1083
1084 ret = ccw_driver_register(&raw3215_ccw_driver);
1085 if (ret) {
1086 tty_driver_kref_put(driver);
1087 return ret;
1088 }
1089 /*
1090 * Initialize the tty_driver structure
1091 * Entries in tty3215_driver that are NOT initialized:
1092 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1093 */
1094
1095 driver->driver_name = "tty3215";
1096 driver->name = "ttyS";
1097 driver->major = TTY_MAJOR;
1098 driver->minor_start = 64;
1099 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1100 driver->subtype = SYSTEM_TYPE_TTY;
1101 driver->init_termios = tty_std_termios;
1102 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1103 driver->init_termios.c_oflag = ONLCR;
1104 driver->init_termios.c_lflag = ISIG;
1105 tty_set_operations(driver, &tty3215_ops);
1106 ret = tty_register_driver(driver);
1107 if (ret) {
1108 tty_driver_kref_put(driver);
1109 return ret;
1110 }
1111 tty3215_driver = driver;
1112 return 0;
1113 }
1114 device_initcall(tty3215_init);
1115
