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/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 <linux/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 wait_queue_head_t empty_wait; /* wait queue for flushing */
89 struct timer_list timer; /* timer for delayed output */
90 int line_pos; /* position on the line (for tabs) */
91 char ubuffer[80]; /* copy_from_user buffer */
92 };
93
94 /* array of 3215 devices structures */
95 static struct raw3215_info *raw3215[NR_3215];
96 /* spinlock to protect the raw3215 array */
97 static DEFINE_SPINLOCK(raw3215_device_lock);
98 /* list of free request structures */
99 static struct raw3215_req *raw3215_freelist;
100 /* spinlock to protect free list */
101 static DEFINE_SPINLOCK(raw3215_freelist_lock);
102
103 static struct tty_driver *tty3215_driver;
104
105 /*
106 * Get a request structure from the free list
107 */
raw3215_alloc_req(void)108 static inline struct raw3215_req *raw3215_alloc_req(void)
109 {
110 struct raw3215_req *req;
111 unsigned long flags;
112
113 spin_lock_irqsave(&raw3215_freelist_lock, flags);
114 req = raw3215_freelist;
115 raw3215_freelist = req->next;
116 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
117 return req;
118 }
119
120 /*
121 * Put a request structure back to the free list
122 */
raw3215_free_req(struct raw3215_req * req)123 static inline void raw3215_free_req(struct raw3215_req *req)
124 {
125 unsigned long flags;
126
127 if (req->type == RAW3215_FREE)
128 return; /* don't free a free request */
129 req->type = RAW3215_FREE;
130 spin_lock_irqsave(&raw3215_freelist_lock, flags);
131 req->next = raw3215_freelist;
132 raw3215_freelist = req;
133 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
134 }
135
136 /*
137 * Set up a read request that reads up to 160 byte from the 3215 device.
138 * If there is a queued read request it is used, but that shouldn't happen
139 * because a 3215 terminal won't accept a new read before the old one is
140 * completed.
141 */
raw3215_mk_read_req(struct raw3215_info * raw)142 static void raw3215_mk_read_req(struct raw3215_info *raw)
143 {
144 struct raw3215_req *req;
145 struct ccw1 *ccw;
146
147 /* there can only be ONE read request at a time */
148 req = raw->queued_read;
149 if (req == NULL) {
150 /* no queued read request, use new req structure */
151 req = raw3215_alloc_req();
152 req->type = RAW3215_READ;
153 req->info = raw;
154 raw->queued_read = req;
155 }
156
157 ccw = req->ccws;
158 ccw->cmd_code = 0x0A; /* read inquiry */
159 ccw->flags = 0x20; /* ignore incorrect length */
160 ccw->count = 160;
161 ccw->cda = (__u32) __pa(raw->inbuf);
162 }
163
164 /*
165 * Set up a write request with the information from the main structure.
166 * A ccw chain is created that writes as much as possible from the output
167 * buffer to the 3215 device. If a queued write exists it is replaced by
168 * the new, probably lengthened request.
169 */
raw3215_mk_write_req(struct raw3215_info * raw)170 static void raw3215_mk_write_req(struct raw3215_info *raw)
171 {
172 struct raw3215_req *req;
173 struct ccw1 *ccw;
174 int len, count, ix, lines;
175
176 if (raw->count <= raw->written)
177 return;
178 /* check if there is a queued write request */
179 req = raw->queued_write;
180 if (req == NULL) {
181 /* no queued write request, use new req structure */
182 req = raw3215_alloc_req();
183 req->type = RAW3215_WRITE;
184 req->info = raw;
185 raw->queued_write = req;
186 } else {
187 raw->written -= req->len;
188 }
189
190 ccw = req->ccws;
191 req->start = (raw->head - raw->count + raw->written) &
192 (RAW3215_BUFFER_SIZE - 1);
193 /*
194 * now we have to count newlines. We can at max accept
195 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
196 * a restriction in VM
197 */
198 lines = 0;
199 ix = req->start;
200 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
201 if (raw->buffer[ix] == 0x15)
202 lines++;
203 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
204 }
205 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
206 if (len > RAW3215_MAX_BYTES)
207 len = RAW3215_MAX_BYTES;
208 req->len = len;
209 raw->written += len;
210
211 /* set the indication if we should try to enlarge this request */
212 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
213
214 ix = req->start;
215 while (len > 0) {
216 if (ccw > req->ccws)
217 ccw[-1].flags |= 0x40; /* use command chaining */
218 ccw->cmd_code = 0x01; /* write, auto carrier return */
219 ccw->flags = 0x20; /* ignore incorrect length ind. */
220 ccw->cda =
221 (__u32) __pa(raw->buffer + ix);
222 count = len;
223 if (ix + count > RAW3215_BUFFER_SIZE)
224 count = RAW3215_BUFFER_SIZE - ix;
225 ccw->count = count;
226 len -= count;
227 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
228 ccw++;
229 }
230 /*
231 * Add a NOP to the channel program. 3215 devices are purely
232 * emulated and its much better to avoid the channel end
233 * interrupt in this case.
234 */
235 if (ccw > req->ccws)
236 ccw[-1].flags |= 0x40; /* use command chaining */
237 ccw->cmd_code = 0x03; /* NOP */
238 ccw->flags = 0;
239 ccw->cda = 0;
240 ccw->count = 1;
241 }
242
243 /*
244 * Start a read or a write request
245 */
raw3215_start_io(struct raw3215_info * raw)246 static void raw3215_start_io(struct raw3215_info *raw)
247 {
248 struct raw3215_req *req;
249 int res;
250
251 req = raw->queued_read;
252 if (req != NULL &&
253 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
254 /* dequeue request */
255 raw->queued_read = NULL;
256 res = ccw_device_start(raw->cdev, req->ccws,
257 (unsigned long) req, 0, 0);
258 if (res != 0) {
259 /* do_IO failed, put request back to queue */
260 raw->queued_read = req;
261 } else {
262 raw->flags |= RAW3215_WORKING;
263 }
264 }
265 req = raw->queued_write;
266 if (req != NULL &&
267 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
268 /* dequeue request */
269 raw->queued_write = NULL;
270 res = ccw_device_start(raw->cdev, req->ccws,
271 (unsigned long) req, 0, 0);
272 if (res != 0) {
273 /* do_IO failed, put request back to queue */
274 raw->queued_write = req;
275 } else {
276 raw->flags |= RAW3215_WORKING;
277 }
278 }
279 }
280
281 /*
282 * Function to start a delayed output after RAW3215_TIMEOUT seconds
283 */
raw3215_timeout(struct timer_list * t)284 static void raw3215_timeout(struct timer_list *t)
285 {
286 struct raw3215_info *raw = from_timer(raw, t, timer);
287 unsigned long flags;
288
289 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
290 raw->flags &= ~RAW3215_TIMER_RUNS;
291 raw3215_mk_write_req(raw);
292 raw3215_start_io(raw);
293 if ((raw->queued_read || raw->queued_write) &&
294 !(raw->flags & RAW3215_WORKING) &&
295 !(raw->flags & RAW3215_TIMER_RUNS)) {
296 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
297 add_timer(&raw->timer);
298 raw->flags |= RAW3215_TIMER_RUNS;
299 }
300 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
301 }
302
303 /*
304 * Function to conditionally start an IO. A read is started immediately,
305 * a write is only started immediately if the flush flag is on or the
306 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
307 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
308 */
raw3215_try_io(struct raw3215_info * raw)309 static inline void raw3215_try_io(struct raw3215_info *raw)
310 {
311 if (!tty_port_initialized(&raw->port))
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 }
321 }
322 if ((raw->queued_read || raw->queued_write) &&
323 !(raw->flags & RAW3215_WORKING) &&
324 !(raw->flags & RAW3215_TIMER_RUNS)) {
325 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
326 add_timer(&raw->timer);
327 raw->flags |= RAW3215_TIMER_RUNS;
328 }
329 }
330
331 /*
332 * Try to start the next IO and wake up processes waiting on the tty.
333 */
raw3215_next_io(struct raw3215_info * raw,struct tty_struct * tty)334 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
335 {
336 raw3215_mk_write_req(raw);
337 raw3215_try_io(raw);
338 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
339 tty_wakeup(tty);
340 }
341
342 /*
343 * Interrupt routine, called from common io layer
344 */
raw3215_irq(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)345 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
346 struct irb *irb)
347 {
348 struct raw3215_info *raw;
349 struct raw3215_req *req;
350 struct tty_struct *tty;
351 int cstat, dstat;
352 int count;
353
354 raw = dev_get_drvdata(&cdev->dev);
355 req = (struct raw3215_req *) intparm;
356 tty = tty_port_tty_get(&raw->port);
357 cstat = irb->scsw.cmd.cstat;
358 dstat = irb->scsw.cmd.dstat;
359 if (cstat != 0)
360 raw3215_next_io(raw, tty);
361 if (dstat & 0x01) { /* we got a unit exception */
362 dstat &= ~0x01; /* we can ignore it */
363 }
364 switch (dstat) {
365 case 0x80:
366 if (cstat != 0)
367 break;
368 /* Attention interrupt, someone hit the enter key */
369 raw3215_mk_read_req(raw);
370 raw3215_next_io(raw, tty);
371 break;
372 case 0x08:
373 case 0x0C:
374 /* Channel end interrupt. */
375 if ((raw = req->info) == NULL)
376 goto put_tty; /* That shouldn't happen ... */
377 if (req->type == RAW3215_READ) {
378 /* store residual count, then wait for device end */
379 req->residual = irb->scsw.cmd.count;
380 }
381 if (dstat == 0x08)
382 break;
383 fallthrough;
384 case 0x04:
385 /* Device end interrupt. */
386 if ((raw = req->info) == NULL)
387 goto put_tty; /* That shouldn't happen ... */
388 if (req->type == RAW3215_READ && tty != NULL) {
389 unsigned int cchar;
390
391 count = 160 - req->residual;
392 EBCASC(raw->inbuf, count);
393 cchar = ctrlchar_handle(raw->inbuf, count, tty);
394 switch (cchar & CTRLCHAR_MASK) {
395 case CTRLCHAR_SYSRQ:
396 break;
397
398 case CTRLCHAR_CTRL:
399 tty_insert_flip_char(&raw->port, cchar,
400 TTY_NORMAL);
401 tty_flip_buffer_push(&raw->port);
402 break;
403
404 case CTRLCHAR_NONE:
405 if (count < 2 ||
406 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
407 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
408 /* add the auto \n */
409 raw->inbuf[count] = '\n';
410 count++;
411 } else
412 count -= 2;
413 tty_insert_flip_string(&raw->port, raw->inbuf,
414 count);
415 tty_flip_buffer_push(&raw->port);
416 break;
417 }
418 } else if (req->type == RAW3215_WRITE) {
419 raw->count -= req->len;
420 raw->written -= req->len;
421 }
422 raw->flags &= ~RAW3215_WORKING;
423 raw3215_free_req(req);
424 /* check for empty wait */
425 if (waitqueue_active(&raw->empty_wait) &&
426 raw->queued_write == NULL &&
427 raw->queued_read == NULL) {
428 wake_up_interruptible(&raw->empty_wait);
429 }
430 raw3215_next_io(raw, tty);
431 break;
432 default:
433 /* Strange interrupt, I'll do my best to clean up */
434 if (req != NULL && req->type != RAW3215_FREE) {
435 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 }
442 raw3215_next_io(raw, tty);
443 }
444 put_tty:
445 tty_kref_put(tty);
446 }
447
448 /*
449 * Wait until length bytes are available int the output buffer.
450 * Has to be called with the s390irq lock held. Can be called
451 * disabled.
452 */
raw3215_make_room(struct raw3215_info * raw,unsigned int length)453 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
454 {
455 while (RAW3215_BUFFER_SIZE - raw->count < length) {
456 /* there might be a request pending */
457 raw->flags |= RAW3215_FLUSHING;
458 raw3215_mk_write_req(raw);
459 raw3215_try_io(raw);
460 raw->flags &= ~RAW3215_FLUSHING;
461 #ifdef CONFIG_TN3215_CONSOLE
462 ccw_device_wait_idle(raw->cdev);
463 #endif
464 /* Enough room freed up ? */
465 if (RAW3215_BUFFER_SIZE - raw->count >= length)
466 break;
467 /* there might be another cpu waiting for the lock */
468 spin_unlock(get_ccwdev_lock(raw->cdev));
469 udelay(100);
470 spin_lock(get_ccwdev_lock(raw->cdev));
471 }
472 }
473
474 /*
475 * String write routine for 3215 devices
476 */
raw3215_write(struct raw3215_info * raw,const char * str,unsigned int length)477 static void raw3215_write(struct raw3215_info *raw, const char *str,
478 unsigned int length)
479 {
480 unsigned long flags;
481 int c, count;
482
483 while (length > 0) {
484 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
485 count = (length > RAW3215_BUFFER_SIZE) ?
486 RAW3215_BUFFER_SIZE : length;
487 length -= count;
488
489 raw3215_make_room(raw, count);
490
491 /* copy string to output buffer and convert it to EBCDIC */
492 while (1) {
493 c = min_t(int, count,
494 min(RAW3215_BUFFER_SIZE - raw->count,
495 RAW3215_BUFFER_SIZE - raw->head));
496 if (c <= 0)
497 break;
498 memcpy(raw->buffer + raw->head, str, c);
499 ASCEBC(raw->buffer + raw->head, c);
500 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
501 raw->count += c;
502 raw->line_pos += c;
503 str += c;
504 count -= c;
505 }
506 if (!(raw->flags & RAW3215_WORKING)) {
507 raw3215_mk_write_req(raw);
508 /* start or queue request */
509 raw3215_try_io(raw);
510 }
511 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
512 }
513 }
514
515 /*
516 * Put character routine for 3215 devices
517 */
raw3215_putchar(struct raw3215_info * raw,unsigned char ch)518 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
519 {
520 unsigned long flags;
521 unsigned int length, i;
522
523 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
524 if (ch == '\t') {
525 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
526 raw->line_pos += length;
527 ch = ' ';
528 } else if (ch == '\n') {
529 length = 1;
530 raw->line_pos = 0;
531 } else {
532 length = 1;
533 raw->line_pos++;
534 }
535 raw3215_make_room(raw, length);
536
537 for (i = 0; i < length; i++) {
538 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
539 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
540 raw->count++;
541 }
542 if (!(raw->flags & RAW3215_WORKING)) {
543 raw3215_mk_write_req(raw);
544 /* start or queue request */
545 raw3215_try_io(raw);
546 }
547 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
548 }
549
550 /*
551 * Flush routine, it simply sets the flush flag and tries to start
552 * pending IO.
553 */
raw3215_flush_buffer(struct raw3215_info * raw)554 static void raw3215_flush_buffer(struct raw3215_info *raw)
555 {
556 unsigned long flags;
557
558 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
559 if (raw->count > 0) {
560 raw->flags |= RAW3215_FLUSHING;
561 raw3215_try_io(raw);
562 raw->flags &= ~RAW3215_FLUSHING;
563 }
564 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
565 }
566
567 /*
568 * Fire up a 3215 device.
569 */
raw3215_startup(struct raw3215_info * raw)570 static int raw3215_startup(struct raw3215_info *raw)
571 {
572 unsigned long flags;
573
574 if (tty_port_initialized(&raw->port))
575 return 0;
576 raw->line_pos = 0;
577 tty_port_set_initialized(&raw->port, 1);
578 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
579 raw3215_try_io(raw);
580 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
581
582 return 0;
583 }
584
585 /*
586 * Shutdown a 3215 device.
587 */
raw3215_shutdown(struct raw3215_info * raw)588 static void raw3215_shutdown(struct raw3215_info *raw)
589 {
590 DECLARE_WAITQUEUE(wait, current);
591 unsigned long flags;
592
593 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))
594 return;
595 /* Wait for outstanding requests, then free irq */
596 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
597 if ((raw->flags & RAW3215_WORKING) ||
598 raw->queued_write != NULL ||
599 raw->queued_read != NULL) {
600 add_wait_queue(&raw->empty_wait, &wait);
601 set_current_state(TASK_INTERRUPTIBLE);
602 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
603 schedule();
604 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
605 remove_wait_queue(&raw->empty_wait, &wait);
606 set_current_state(TASK_RUNNING);
607 tty_port_set_initialized(&raw->port, 1);
608 }
609 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
610 }
611
raw3215_alloc_info(void)612 static struct raw3215_info *raw3215_alloc_info(void)
613 {
614 struct raw3215_info *info;
615
616 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
617 if (!info)
618 return NULL;
619
620 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
621 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
622 if (!info->buffer || !info->inbuf) {
623 kfree(info->inbuf);
624 kfree(info->buffer);
625 kfree(info);
626 return NULL;
627 }
628
629 timer_setup(&info->timer, raw3215_timeout, 0);
630 init_waitqueue_head(&info->empty_wait);
631 tty_port_init(&info->port);
632
633 return info;
634 }
635
raw3215_free_info(struct raw3215_info * raw)636 static void raw3215_free_info(struct raw3215_info *raw)
637 {
638 kfree(raw->inbuf);
639 kfree(raw->buffer);
640 tty_port_destroy(&raw->port);
641 kfree(raw);
642 }
643
raw3215_probe(struct ccw_device * cdev)644 static int raw3215_probe (struct ccw_device *cdev)
645 {
646 struct raw3215_info *raw;
647 int line;
648
649 /* Console is special. */
650 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
651 return 0;
652
653 raw = raw3215_alloc_info();
654 if (raw == NULL)
655 return -ENOMEM;
656
657 raw->cdev = cdev;
658 dev_set_drvdata(&cdev->dev, raw);
659 cdev->handler = raw3215_irq;
660
661 spin_lock(&raw3215_device_lock);
662 for (line = 0; line < NR_3215; line++) {
663 if (!raw3215[line]) {
664 raw3215[line] = raw;
665 break;
666 }
667 }
668 spin_unlock(&raw3215_device_lock);
669 if (line == NR_3215) {
670 raw3215_free_info(raw);
671 return -ENODEV;
672 }
673
674 return 0;
675 }
676
raw3215_remove(struct ccw_device * cdev)677 static void raw3215_remove (struct ccw_device *cdev)
678 {
679 struct raw3215_info *raw;
680 unsigned int line;
681
682 ccw_device_set_offline(cdev);
683 raw = dev_get_drvdata(&cdev->dev);
684 if (raw) {
685 spin_lock(&raw3215_device_lock);
686 for (line = 0; line < NR_3215; line++)
687 if (raw3215[line] == raw)
688 break;
689 raw3215[line] = NULL;
690 spin_unlock(&raw3215_device_lock);
691 dev_set_drvdata(&cdev->dev, NULL);
692 raw3215_free_info(raw);
693 }
694 }
695
raw3215_set_online(struct ccw_device * cdev)696 static int raw3215_set_online (struct ccw_device *cdev)
697 {
698 struct raw3215_info *raw;
699
700 raw = dev_get_drvdata(&cdev->dev);
701 if (!raw)
702 return -ENODEV;
703
704 return raw3215_startup(raw);
705 }
706
raw3215_set_offline(struct ccw_device * cdev)707 static int raw3215_set_offline (struct ccw_device *cdev)
708 {
709 struct raw3215_info *raw;
710
711 raw = dev_get_drvdata(&cdev->dev);
712 if (!raw)
713 return -ENODEV;
714
715 raw3215_shutdown(raw);
716
717 return 0;
718 }
719
720 static struct ccw_device_id raw3215_id[] = {
721 { CCW_DEVICE(0x3215, 0) },
722 { /* end of list */ },
723 };
724
725 static struct ccw_driver raw3215_ccw_driver = {
726 .driver = {
727 .name = "3215",
728 .owner = THIS_MODULE,
729 },
730 .ids = raw3215_id,
731 .probe = &raw3215_probe,
732 .remove = &raw3215_remove,
733 .set_online = &raw3215_set_online,
734 .set_offline = &raw3215_set_offline,
735 .int_class = IRQIO_C15,
736 };
737
738 #ifdef CONFIG_TN3215_CONSOLE
739 /*
740 * Write a string to the 3215 console
741 */
con3215_write(struct console * co,const char * str,unsigned int count)742 static void con3215_write(struct console *co, const char *str,
743 unsigned int count)
744 {
745 struct raw3215_info *raw;
746 int i;
747
748 if (count <= 0)
749 return;
750 raw = raw3215[0]; /* console 3215 is the first one */
751 while (count > 0) {
752 for (i = 0; i < count; i++)
753 if (str[i] == '\t' || str[i] == '\n')
754 break;
755 raw3215_write(raw, str, i);
756 count -= i;
757 str += i;
758 if (count > 0) {
759 raw3215_putchar(raw, *str);
760 count--;
761 str++;
762 }
763 }
764 }
765
con3215_device(struct console * c,int * index)766 static struct tty_driver *con3215_device(struct console *c, int *index)
767 {
768 *index = c->index;
769 return tty3215_driver;
770 }
771
772 /*
773 * panic() calls con3215_flush through a panic_notifier
774 * before the system enters a disabled, endless loop.
775 */
con3215_flush(void)776 static void con3215_flush(void)
777 {
778 struct raw3215_info *raw;
779 unsigned long flags;
780
781 raw = raw3215[0]; /* console 3215 is the first one */
782 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
783 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
784 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
785 }
786
con3215_notify(struct notifier_block * self,unsigned long event,void * data)787 static int con3215_notify(struct notifier_block *self,
788 unsigned long event, void *data)
789 {
790 con3215_flush();
791 return NOTIFY_OK;
792 }
793
794 static struct notifier_block on_panic_nb = {
795 .notifier_call = con3215_notify,
796 .priority = 0,
797 };
798
799 static struct notifier_block on_reboot_nb = {
800 .notifier_call = con3215_notify,
801 .priority = 0,
802 };
803
804 /*
805 * The console structure for the 3215 console
806 */
807 static struct console con3215 = {
808 .name = "ttyS",
809 .write = con3215_write,
810 .device = con3215_device,
811 .flags = CON_PRINTBUFFER,
812 };
813
814 /*
815 * 3215 console initialization code called from console_init().
816 */
con3215_init(void)817 static int __init con3215_init(void)
818 {
819 struct ccw_device *cdev;
820 struct raw3215_info *raw;
821 struct raw3215_req *req;
822 int i;
823
824 /* Check if 3215 is to be the console */
825 if (!CONSOLE_IS_3215)
826 return -ENODEV;
827
828 /* Set the console mode for VM */
829 if (MACHINE_IS_VM) {
830 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
831 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
832 }
833
834 /* allocate 3215 request structures */
835 raw3215_freelist = NULL;
836 for (i = 0; i < NR_3215_REQ; i++) {
837 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
838 if (!req)
839 return -ENOMEM;
840 req->next = raw3215_freelist;
841 raw3215_freelist = req;
842 }
843
844 cdev = ccw_device_create_console(&raw3215_ccw_driver);
845 if (IS_ERR(cdev))
846 return -ENODEV;
847
848 raw3215[0] = raw = raw3215_alloc_info();
849 raw->cdev = cdev;
850 dev_set_drvdata(&cdev->dev, raw);
851 cdev->handler = raw3215_irq;
852
853 raw->flags |= RAW3215_FIXED;
854 if (ccw_device_enable_console(cdev)) {
855 ccw_device_destroy_console(cdev);
856 raw3215_free_info(raw);
857 raw3215[0] = NULL;
858 return -ENODEV;
859 }
860
861 /* Request the console irq */
862 if (raw3215_startup(raw) != 0) {
863 raw3215_free_info(raw);
864 raw3215[0] = NULL;
865 return -ENODEV;
866 }
867 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
868 register_reboot_notifier(&on_reboot_nb);
869 register_console(&con3215);
870 return 0;
871 }
872 console_initcall(con3215_init);
873 #endif
874
tty3215_install(struct tty_driver * driver,struct tty_struct * tty)875 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
876 {
877 struct raw3215_info *raw;
878
879 raw = raw3215[tty->index];
880 if (raw == NULL)
881 return -ENODEV;
882
883 tty->driver_data = raw;
884
885 return tty_port_install(&raw->port, driver, tty);
886 }
887
888 /*
889 * tty3215_open
890 *
891 * This routine is called whenever a 3215 tty is opened.
892 */
tty3215_open(struct tty_struct * tty,struct file * filp)893 static int tty3215_open(struct tty_struct *tty, struct file * filp)
894 {
895 struct raw3215_info *raw = tty->driver_data;
896
897 tty_port_tty_set(&raw->port, tty);
898
899 /*
900 * Start up 3215 device
901 */
902 return raw3215_startup(raw);
903 }
904
905 /*
906 * tty3215_close()
907 *
908 * This routine is called when the 3215 tty is closed. We wait
909 * for the remaining request to be completed. Then we clean up.
910 */
tty3215_close(struct tty_struct * tty,struct file * filp)911 static void tty3215_close(struct tty_struct *tty, struct file * filp)
912 {
913 struct raw3215_info *raw = tty->driver_data;
914
915 if (raw == NULL || tty->count > 1)
916 return;
917 tty->closing = 1;
918 /* Shutdown the terminal */
919 raw3215_shutdown(raw);
920 tty->closing = 0;
921 tty_port_tty_set(&raw->port, NULL);
922 }
923
924 /*
925 * Returns the amount of free space in the output buffer.
926 */
tty3215_write_room(struct tty_struct * tty)927 static int tty3215_write_room(struct tty_struct *tty)
928 {
929 struct raw3215_info *raw = tty->driver_data;
930
931 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
932 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
933 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
934 else
935 return 0;
936 }
937
938 /*
939 * String write routine for 3215 ttys
940 */
tty3215_write(struct tty_struct * tty,const unsigned char * buf,int count)941 static int tty3215_write(struct tty_struct * tty,
942 const unsigned char *buf, int count)
943 {
944 struct raw3215_info *raw = tty->driver_data;
945 int i, written;
946
947 written = count;
948 while (count > 0) {
949 for (i = 0; i < count; i++)
950 if (buf[i] == '\t' || buf[i] == '\n')
951 break;
952 raw3215_write(raw, buf, i);
953 count -= i;
954 buf += i;
955 if (count > 0) {
956 raw3215_putchar(raw, *buf);
957 count--;
958 buf++;
959 }
960 }
961 return written;
962 }
963
964 /*
965 * Put character routine for 3215 ttys
966 */
tty3215_put_char(struct tty_struct * tty,unsigned char ch)967 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
968 {
969 struct raw3215_info *raw = tty->driver_data;
970
971 raw3215_putchar(raw, ch);
972
973 return 1;
974 }
975
tty3215_flush_chars(struct tty_struct * tty)976 static void tty3215_flush_chars(struct tty_struct *tty)
977 {
978 }
979
980 /*
981 * Returns the number of characters in the output buffer
982 */
tty3215_chars_in_buffer(struct tty_struct * tty)983 static int tty3215_chars_in_buffer(struct tty_struct *tty)
984 {
985 struct raw3215_info *raw = tty->driver_data;
986
987 return raw->count;
988 }
989
tty3215_flush_buffer(struct tty_struct * tty)990 static void tty3215_flush_buffer(struct tty_struct *tty)
991 {
992 struct raw3215_info *raw = tty->driver_data;
993
994 raw3215_flush_buffer(raw);
995 tty_wakeup(tty);
996 }
997
998 /*
999 * Disable reading from a 3215 tty
1000 */
tty3215_throttle(struct tty_struct * tty)1001 static void tty3215_throttle(struct tty_struct * tty)
1002 {
1003 struct raw3215_info *raw = tty->driver_data;
1004
1005 raw->flags |= RAW3215_THROTTLED;
1006 }
1007
1008 /*
1009 * Enable reading from a 3215 tty
1010 */
tty3215_unthrottle(struct tty_struct * tty)1011 static void tty3215_unthrottle(struct tty_struct * tty)
1012 {
1013 struct raw3215_info *raw = tty->driver_data;
1014 unsigned long flags;
1015
1016 if (raw->flags & RAW3215_THROTTLED) {
1017 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1018 raw->flags &= ~RAW3215_THROTTLED;
1019 raw3215_try_io(raw);
1020 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1021 }
1022 }
1023
1024 /*
1025 * Disable writing to a 3215 tty
1026 */
tty3215_stop(struct tty_struct * tty)1027 static void tty3215_stop(struct tty_struct *tty)
1028 {
1029 struct raw3215_info *raw = tty->driver_data;
1030
1031 raw->flags |= RAW3215_STOPPED;
1032 }
1033
1034 /*
1035 * Enable writing to a 3215 tty
1036 */
tty3215_start(struct tty_struct * tty)1037 static void tty3215_start(struct tty_struct *tty)
1038 {
1039 struct raw3215_info *raw = tty->driver_data;
1040 unsigned long flags;
1041
1042 if (raw->flags & RAW3215_STOPPED) {
1043 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1044 raw->flags &= ~RAW3215_STOPPED;
1045 raw3215_try_io(raw);
1046 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1047 }
1048 }
1049
1050 static const struct tty_operations tty3215_ops = {
1051 .install = tty3215_install,
1052 .open = tty3215_open,
1053 .close = tty3215_close,
1054 .write = tty3215_write,
1055 .put_char = tty3215_put_char,
1056 .flush_chars = tty3215_flush_chars,
1057 .write_room = tty3215_write_room,
1058 .chars_in_buffer = tty3215_chars_in_buffer,
1059 .flush_buffer = tty3215_flush_buffer,
1060 .throttle = tty3215_throttle,
1061 .unthrottle = tty3215_unthrottle,
1062 .stop = tty3215_stop,
1063 .start = tty3215_start,
1064 };
1065
1066 /*
1067 * 3215 tty registration code called from tty_init().
1068 * Most kernel services (incl. kmalloc) are available at this poimt.
1069 */
tty3215_init(void)1070 static int __init tty3215_init(void)
1071 {
1072 struct tty_driver *driver;
1073 int ret;
1074
1075 if (!CONSOLE_IS_3215)
1076 return 0;
1077
1078 driver = alloc_tty_driver(NR_3215);
1079 if (!driver)
1080 return -ENOMEM;
1081
1082 ret = ccw_driver_register(&raw3215_ccw_driver);
1083 if (ret) {
1084 put_tty_driver(driver);
1085 return ret;
1086 }
1087 /*
1088 * Initialize the tty_driver structure
1089 * Entries in tty3215_driver that are NOT initialized:
1090 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1091 */
1092
1093 driver->driver_name = "tty3215";
1094 driver->name = "ttyS";
1095 driver->major = TTY_MAJOR;
1096 driver->minor_start = 64;
1097 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1098 driver->subtype = SYSTEM_TYPE_TTY;
1099 driver->init_termios = tty_std_termios;
1100 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1101 driver->init_termios.c_oflag = ONLCR;
1102 driver->init_termios.c_lflag = ISIG;
1103 driver->flags = TTY_DRIVER_REAL_RAW;
1104 tty_set_operations(driver, &tty3215_ops);
1105 ret = tty_register_driver(driver);
1106 if (ret) {
1107 put_tty_driver(driver);
1108 return ret;
1109 }
1110 tty3215_driver = driver;
1111 return 0;
1112 }
1113 device_initcall(tty3215_init);
1114