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[S390] time: convert from bootmem to slab
[linux-2.6-block.git] / drivers / s390 / char / con3215.c
CommitLineData
1da177e4 1/*
77812a27 2 * 3215 line mode terminal driver.
1da177e4 3 *
77812a27
MS		 4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
1da177e4 6 *
77812a27
MS		 7 * Updated:
8 * Aug-2000: Added tab support
9 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
1da177e4
LT		 10 */
11
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kdev_t.h>
15#include <linux/tty.h>
33f0f88f 16#include <linux/tty_flip.h>
1da177e4
LT		 17#include <linux/vt_kern.h>
18#include <linux/init.h>
19#include <linux/console.h>
20#include <linux/interrupt.h>
600b5d16 21#include <linux/err.h>
2332ce1a 22#include <linux/reboot.h>
1da177e4
LT		 23
24#include <linux/slab.h>
25#include <linux/bootmem.h>
26
27#include <asm/ccwdev.h>
28#include <asm/cio.h>
29#include <asm/io.h>
30#include <asm/ebcdic.h>
31#include <asm/uaccess.h>
32#include <asm/delay.h>
33#include <asm/cpcmd.h>
34#include <asm/setup.h>
35
36#include "ctrlchar.h"
37
38#define NR_3215 1
39#define NR_3215_REQ (4*NR_3215)
40#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
41#define RAW3215_INBUF_SIZE 256 /* input buffer size */
42#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
43#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
44#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
45#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
46#define RAW3215_NR_CCWS 3
47#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
48
49#define RAW3215_FIXED 1 /* 3215 console device is not be freed */
50#define RAW3215_ACTIVE 2 /* set if the device is in use */
51#define RAW3215_WORKING 4 /* set if a request is being worked on */
52#define RAW3215_THROTTLED 8 /* set if reading is disabled */
53#define RAW3215_STOPPED 16 /* set if writing is disabled */
54#define RAW3215_CLOSING 32 /* set while in close process */
55#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
56#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
77812a27 57#define RAW3215_FROZEN 256 /* set if 3215 is frozen for suspend */
1da177e4
LT		 58
59#define TAB_STOP_SIZE 8 /* tab stop size */
60
61/*
62 * Request types for a 3215 device
63 */
64enum raw3215_type {
65 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
66};
67
68/*
69 * Request structure for a 3215 device
70 */
71struct raw3215_req {
72 enum raw3215_type type; /* type of the request */
73 int start, len; /* start index & len in output buffer */
74 int delayable; /* indication to wait for more data */
75 int residual; /* residual count for read request */
76 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
77 struct raw3215_info *info; /* pointer to main structure */
78 struct raw3215_req *next; /* pointer to next request */
79} __attribute__ ((aligned(8)));
80
81struct raw3215_info {
82 struct ccw_device *cdev; /* device for tty driver */
83 spinlock_t *lock; /* pointer to irq lock */
84 int flags; /* state flags */
85 char *buffer; /* pointer to output buffer */
86 char *inbuf; /* pointer to input buffer */
87 int head; /* first free byte in output buffer */
88 int count; /* number of bytes in output buffer */
89 int written; /* number of bytes in write requests */
90 struct tty_struct *tty; /* pointer to tty structure if present */
1da177e4
LT		 91 struct raw3215_req *queued_read; /* pointer to queued read requests */
92 struct raw3215_req *queued_write;/* pointer to queued write requests */
93 wait_queue_head_t empty_wait; /* wait queue for flushing */
94 struct timer_list timer; /* timer for delayed output */
1da177e4
LT		 95 int line_pos; /* position on the line (for tabs) */
96 char ubuffer[80]; /* copy_from_user buffer */
97};
98
99/* array of 3215 devices structures */
100static struct raw3215_info *raw3215[NR_3215];
101/* spinlock to protect the raw3215 array */
102static DEFINE_SPINLOCK(raw3215_device_lock);
103/* list of free request structures */
104static struct raw3215_req *raw3215_freelist;
105/* spinlock to protect free list */
106static spinlock_t raw3215_freelist_lock;
107
108static struct tty_driver *tty3215_driver;
109
110/*
111 * Get a request structure from the free list
112 */
77812a27
MS		 113static inline struct raw3215_req *raw3215_alloc_req(void)
114{
1da177e4
LT		 115 struct raw3215_req *req;
116 unsigned long flags;
117
118 spin_lock_irqsave(&raw3215_freelist_lock, flags);
119 req = raw3215_freelist;
120 raw3215_freelist = req->next;
121 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
122 return req;
123}
124
125/*
126 * Put a request structure back to the free list
127 */
77812a27
MS		 128static inline void raw3215_free_req(struct raw3215_req *req)
129{
1da177e4
LT		 130 unsigned long flags;
131
132 if (req->type == RAW3215_FREE)
133 return; /* don't free a free request */
134 req->type = RAW3215_FREE;
135 spin_lock_irqsave(&raw3215_freelist_lock, flags);
136 req->next = raw3215_freelist;
137 raw3215_freelist = req;
138 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
139}
140
141/*
142 * Set up a read request that reads up to 160 byte from the 3215 device.
143 * If there is a queued read request it is used, but that shouldn't happen
144 * because a 3215 terminal won't accept a new read before the old one is
145 * completed.
146 */
77812a27 147static void raw3215_mk_read_req(struct raw3215_info *raw)
1da177e4
LT		 148{
149 struct raw3215_req *req;
150 struct ccw1 *ccw;
151
152 /* there can only be ONE read request at a time */
153 req = raw->queued_read;
154 if (req == NULL) {
155 /* no queued read request, use new req structure */
156 req = raw3215_alloc_req();
157 req->type = RAW3215_READ;
158 req->info = raw;
159 raw->queued_read = req;
160 }
161
162 ccw = req->ccws;
163 ccw->cmd_code = 0x0A; /* read inquiry */
164 ccw->flags = 0x20; /* ignore incorrect length */
165 ccw->count = 160;
166 ccw->cda = (__u32) __pa(raw->inbuf);
167}
168
169/*
170 * Set up a write request with the information from the main structure.
171 * A ccw chain is created that writes as much as possible from the output
172 * buffer to the 3215 device. If a queued write exists it is replaced by
173 * the new, probably lengthened request.
174 */
77812a27 175static void raw3215_mk_write_req(struct raw3215_info *raw)
1da177e4
LT		 176{
177 struct raw3215_req *req;
178 struct ccw1 *ccw;
179 int len, count, ix, lines;
180
181 if (raw->count <= raw->written)
182 return;
183 /* check if there is a queued write request */
184 req = raw->queued_write;
185 if (req == NULL) {
186 /* no queued write request, use new req structure */
187 req = raw3215_alloc_req();
188 req->type = RAW3215_WRITE;
189 req->info = raw;
190 raw->queued_write = req;
191 } else {
192 raw->written -= req->len;
193 }
194
195 ccw = req->ccws;
196 req->start = (raw->head - raw->count + raw->written) &
197 (RAW3215_BUFFER_SIZE - 1);
198 /*
199 * now we have to count newlines. We can at max accept
200 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
201 * a restriction in VM
202 */
203 lines = 0;
204 ix = req->start;
205 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
206 if (raw->buffer[ix] == 0x15)
207 lines++;
208 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
209 }
210 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
211 if (len > RAW3215_MAX_BYTES)
212 len = RAW3215_MAX_BYTES;
213 req->len = len;
214 raw->written += len;
215
216 /* set the indication if we should try to enlarge this request */
217 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
218
219 ix = req->start;
220 while (len > 0) {
221 if (ccw > req->ccws)
222 ccw[-1].flags |= 0x40; /* use command chaining */
223 ccw->cmd_code = 0x01; /* write, auto carrier return */
224 ccw->flags = 0x20; /* ignore incorrect length ind. */
225 ccw->cda =
226 (__u32) __pa(raw->buffer + ix);
227 count = len;
228 if (ix + count > RAW3215_BUFFER_SIZE)
229 count = RAW3215_BUFFER_SIZE - ix;
230 ccw->count = count;
231 len -= count;
232 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
233 ccw++;
234 }
235 /*
236 * Add a NOP to the channel program. 3215 devices are purely
237 * emulated and its much better to avoid the channel end
238 * interrupt in this case.
239 */
240 if (ccw > req->ccws)
241 ccw[-1].flags |= 0x40; /* use command chaining */
242 ccw->cmd_code = 0x03; /* NOP */
243 ccw->flags = 0;
244 ccw->cda = 0;
245 ccw->count = 1;
246}
247
248/*
249 * Start a read or a write request
250 */
77812a27 251static void raw3215_start_io(struct raw3215_info *raw)
1da177e4
LT		 252{
253 struct raw3215_req *req;
254 int res;
255
256 req = raw->queued_read;
257 if (req != NULL &&
258 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
259 /* dequeue request */
260 raw->queued_read = NULL;
261 res = ccw_device_start(raw->cdev, req->ccws,
262 (unsigned long) req, 0, 0);
263 if (res != 0) {
264 /* do_IO failed, put request back to queue */
265 raw->queued_read = req;
266 } else {
267 raw->flags |= RAW3215_WORKING;
268 }
269 }
270 req = raw->queued_write;
271 if (req != NULL &&
272 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
273 /* dequeue request */
274 raw->queued_write = NULL;
275 res = ccw_device_start(raw->cdev, req->ccws,
276 (unsigned long) req, 0, 0);
277 if (res != 0) {
278 /* do_IO failed, put request back to queue */
279 raw->queued_write = req;
280 } else {
281 raw->flags |= RAW3215_WORKING;
282 }
283 }
284}
285
286/*
287 * Function to start a delayed output after RAW3215_TIMEOUT seconds
288 */
77812a27 289static void raw3215_timeout(unsigned long __data)
1da177e4
LT		 290{
291 struct raw3215_info *raw = (struct raw3215_info *) __data;
292 unsigned long flags;
293
520a4e37 294 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 295 if (raw->flags & RAW3215_TIMER_RUNS) {
296 del_timer(&raw->timer);
297 raw->flags &= ~RAW3215_TIMER_RUNS;
77812a27
MS		 298 if (!(raw->flags & RAW3215_FROZEN)) {
299 raw3215_mk_write_req(raw);
300 raw3215_start_io(raw);
301 }
1da177e4 302 }
520a4e37 303 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 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 */
77812a27 312static inline void raw3215_try_io(struct raw3215_info *raw)
1da177e4 313{
77812a27 314 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FROZEN))
1da177e4
LT		 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 if (raw->flags & RAW3215_TIMER_RUNS) {
324 del_timer(&raw->timer);
325 raw->flags &= ~RAW3215_TIMER_RUNS;
326 }
327 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
328 /* delay small writes */
329 init_timer(&raw->timer);
330 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
331 raw->timer.data = (unsigned long) raw;
332 raw->timer.function = raw3215_timeout;
333 add_timer(&raw->timer);
334 raw->flags |= RAW3215_TIMER_RUNS;
335 }
336 }
337}
338
339/*
408aec3c 340 * Try to start the next IO and wake up processes waiting on the tty.
1da177e4 341 */
408aec3c 342static void raw3215_next_io(struct raw3215_info *raw)
1da177e4 343{
1da177e4 344 struct tty_struct *tty;
1da177e4 345
1da177e4
LT		 346 raw3215_mk_write_req(raw);
347 raw3215_try_io(raw);
1da177e4
LT		 348 tty = raw->tty;
349 if (tty != NULL &&
350 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
351 tty_wakeup(tty);
352 }
353}
354
355/*
356 * Interrupt routine, called from common io layer
357 */
77812a27
MS		 358static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
359 struct irb *irb)
1da177e4
LT		 360{
361 struct raw3215_info *raw;
362 struct raw3215_req *req;
363 struct tty_struct *tty;
364 int cstat, dstat;
1d030370 365 int count;
1da177e4 366
dff59b64 367 raw = dev_get_drvdata(&cdev->dev);
1da177e4 368 req = (struct raw3215_req *) intparm;
23d805b6
PO		 369 cstat = irb->scsw.cmd.cstat;
370 dstat = irb->scsw.cmd.dstat;
26348f78 371 if (cstat != 0)
408aec3c 372 raw3215_next_io(raw);
1da177e4
LT		 373 if (dstat & 0x01) { /* we got a unit exception */
374 dstat &= ~0x01; /* we can ignore it */
375 }
376 switch (dstat) {
377 case 0x80:
378 if (cstat != 0)
379 break;
380 /* Attention interrupt, someone hit the enter key */
381 raw3215_mk_read_req(raw);
408aec3c 382 raw3215_next_io(raw);
1da177e4
LT		 383 break;
384 case 0x08:
385 case 0x0C:
386 /* Channel end interrupt. */
387 if ((raw = req->info) == NULL)
388 return; /* That shouldn't happen ... */
389 if (req->type == RAW3215_READ) {
390 /* store residual count, then wait for device end */
23d805b6 391 req->residual = irb->scsw.cmd.count;
1da177e4
LT		 392 }
393 if (dstat == 0x08)
394 break;
395 case 0x04:
396 /* Device end interrupt. */
397 if ((raw = req->info) == NULL)
398 return; /* That shouldn't happen ... */
399 if (req->type == RAW3215_READ && raw->tty != NULL) {
400 unsigned int cchar;
401
402 tty = raw->tty;
403 count = 160 - req->residual;
1da177e4
LT		 404 EBCASC(raw->inbuf, count);
405 cchar = ctrlchar_handle(raw->inbuf, count, tty);
406 switch (cchar & CTRLCHAR_MASK) {
407 case CTRLCHAR_SYSRQ:
408 break;
409
410 case CTRLCHAR_CTRL:
33f0f88f 411 tty_insert_flip_char(tty, cchar, TTY_NORMAL);
1da177e4
LT		 412 tty_flip_buffer_push(raw->tty);
413 break;
414
415 case CTRLCHAR_NONE:
1da177e4 416 if (count < 2 ||
33f0f88f
AC		 417 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
418 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
419 /* add the auto \n */
420 raw->inbuf[count] = '\n';
1da177e4
LT		 421 count++;
422 } else
33f0f88f
AC		 423 count -= 2;
424 tty_insert_flip_string(tty, raw->inbuf, count);
1da177e4
LT		 425 tty_flip_buffer_push(raw->tty);
426 break;
427 }
428 } else if (req->type == RAW3215_WRITE) {
429 raw->count -= req->len;
430 raw->written -= req->len;
431 }
432 raw->flags &= ~RAW3215_WORKING;
433 raw3215_free_req(req);
434 /* check for empty wait */
435 if (waitqueue_active(&raw->empty_wait) &&
436 raw->queued_write == NULL &&
437 raw->queued_read == NULL) {
438 wake_up_interruptible(&raw->empty_wait);
439 }
408aec3c 440 raw3215_next_io(raw);
1da177e4
LT		 441 break;
442 default:
443 /* Strange interrupt, I'll do my best to clean up */
444 if (req != NULL && req->type != RAW3215_FREE) {
445 if (req->type == RAW3215_WRITE) {
446 raw->count -= req->len;
447 raw->written -= req->len;
448 }
449 raw->flags &= ~RAW3215_WORKING;
450 raw3215_free_req(req);
451 }
408aec3c 452 raw3215_next_io(raw);
1da177e4
LT		 453 }
454 return;
455}
456
77812a27
MS		 457/*
458 * Drop the oldest line from the output buffer.
459 */
460static void raw3215_drop_line(struct raw3215_info *raw)
461{
462 int ix;
463 char ch;
464
465 BUG_ON(raw->written != 0);
466 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
467 while (raw->count > 0) {
468 ch = raw->buffer[ix];
469 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
470 raw->count--;
471 if (ch == 0x15)
472 break;
473 }
474 raw->head = ix;
475}
476
1da177e4
LT		 477/*
478 * Wait until length bytes are available int the output buffer.
479 * Has to be called with the s390irq lock held. Can be called
480 * disabled.
481 */
77812a27 482static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
1da177e4
LT		 483{
484 while (RAW3215_BUFFER_SIZE - raw->count < length) {
77812a27
MS		 485 /* While console is frozen for suspend we have no other
486 * choice but to drop message from the buffer to make
487 * room for even more messages. */
488 if (raw->flags & RAW3215_FROZEN) {
489 raw3215_drop_line(raw);
490 continue;
491 }
1da177e4
LT		 492 /* there might be a request pending */
493 raw->flags |= RAW3215_FLUSHING;
494 raw3215_mk_write_req(raw);
495 raw3215_try_io(raw);
496 raw->flags &= ~RAW3215_FLUSHING;
497#ifdef CONFIG_TN3215_CONSOLE
498 wait_cons_dev();
499#endif
500 /* Enough room freed up ? */
501 if (RAW3215_BUFFER_SIZE - raw->count >= length)
502 break;
503 /* there might be another cpu waiting for the lock */
520a4e37 504 spin_unlock(get_ccwdev_lock(raw->cdev));
1da177e4 505 udelay(100);
520a4e37 506 spin_lock(get_ccwdev_lock(raw->cdev));
1da177e4
LT		 507 }
508}
509
510/*
511 * String write routine for 3215 devices
512 */
77812a27
MS		 513static void raw3215_write(struct raw3215_info *raw, const char *str,
514 unsigned int length)
1da177e4
LT		 515{
516 unsigned long flags;
517 int c, count;
518
519 while (length > 0) {
520a4e37 520 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 521 count = (length > RAW3215_BUFFER_SIZE) ?
522 RAW3215_BUFFER_SIZE : length;
523 length -= count;
524
525 raw3215_make_room(raw, count);
526
527 /* copy string to output buffer and convert it to EBCDIC */
528 while (1) {
529 c = min_t(int, count,
530 min(RAW3215_BUFFER_SIZE - raw->count,
531 RAW3215_BUFFER_SIZE - raw->head));
532 if (c <= 0)
533 break;
534 memcpy(raw->buffer + raw->head, str, c);
535 ASCEBC(raw->buffer + raw->head, c);
536 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
537 raw->count += c;
538 raw->line_pos += c;
539 str += c;
540 count -= c;
541 }
542 if (!(raw->flags & RAW3215_WORKING)) {
543 raw3215_mk_write_req(raw);
544 /* start or queue request */
545 raw3215_try_io(raw);
546 }
520a4e37 547 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 548 }
549}
550
551/*
552 * Put character routine for 3215 devices
553 */
77812a27 554static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
1da177e4
LT		 555{
556 unsigned long flags;
557 unsigned int length, i;
558
520a4e37 559 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 560 if (ch == '\t') {
561 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
562 raw->line_pos += length;
563 ch = ' ';
564 } else if (ch == '\n') {
565 length = 1;
566 raw->line_pos = 0;
567 } else {
568 length = 1;
569 raw->line_pos++;
570 }
571 raw3215_make_room(raw, length);
572
573 for (i = 0; i < length; i++) {
574 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
575 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
576 raw->count++;
577 }
578 if (!(raw->flags & RAW3215_WORKING)) {
579 raw3215_mk_write_req(raw);
580 /* start or queue request */
581 raw3215_try_io(raw);
582 }
520a4e37 583 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 584}
585
586/*
587 * Flush routine, it simply sets the flush flag and tries to start
588 * pending IO.
589 */
77812a27 590static void raw3215_flush_buffer(struct raw3215_info *raw)
1da177e4
LT		 591{
592 unsigned long flags;
593
520a4e37 594 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 595 if (raw->count > 0) {
596 raw->flags |= RAW3215_FLUSHING;
597 raw3215_try_io(raw);
598 raw->flags &= ~RAW3215_FLUSHING;
599 }
520a4e37 600 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 601}
602
603/*
604 * Fire up a 3215 device.
605 */
77812a27 606static int raw3215_startup(struct raw3215_info *raw)
1da177e4
LT		 607{
608 unsigned long flags;
609
610 if (raw->flags & RAW3215_ACTIVE)
611 return 0;
612 raw->line_pos = 0;
613 raw->flags |= RAW3215_ACTIVE;
520a4e37 614 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4 615 raw3215_try_io(raw);
520a4e37 616 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 617
618 return 0;
619}
620
621/*
622 * Shutdown a 3215 device.
623 */
77812a27 624static void raw3215_shutdown(struct raw3215_info *raw)
1da177e4
LT		 625{
626 DECLARE_WAITQUEUE(wait, current);
627 unsigned long flags;
628
629 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
630 return;
631 /* Wait for outstanding requests, then free irq */
520a4e37 632 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 633 if ((raw->flags & RAW3215_WORKING) ||
634 raw->queued_write != NULL ||
635 raw->queued_read != NULL) {
636 raw->flags |= RAW3215_CLOSING;
637 add_wait_queue(&raw->empty_wait, &wait);
638 set_current_state(TASK_INTERRUPTIBLE);
520a4e37 639 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4 640 schedule();
520a4e37 641 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 642 remove_wait_queue(&raw->empty_wait, &wait);
643 set_current_state(TASK_RUNNING);
644 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING);
645 }
520a4e37 646 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 647}
648
77812a27 649static int raw3215_probe (struct ccw_device *cdev)
1da177e4
LT		 650{
651 struct raw3215_info *raw;
652 int line;
653
a2e53801 654 /* Console is special. */
dff59b64 655 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
a2e53801 656 return 0;
1da177e4
LT		 657 raw = kmalloc(sizeof(struct raw3215_info) +
658 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
659 if (raw == NULL)
660 return -ENOMEM;
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 kfree(raw);
672 return -ENODEV;
673 }
674
675 raw->cdev = cdev;
1da177e4
LT		 676 raw->inbuf = (char *) raw + sizeof(struct raw3215_info);
677 memset(raw, 0, sizeof(struct raw3215_info));
5cbded58 678 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE,
1da177e4
LT		 679 GFP_KERNEL|GFP_DMA);
680 if (raw->buffer == NULL) {
681 spin_lock(&raw3215_device_lock);
d2c993d8 682 raw3215[line] = NULL;
1da177e4
LT		 683 spin_unlock(&raw3215_device_lock);
684 kfree(raw);
685 return -ENOMEM;
686 }
1da177e4
LT		 687 init_waitqueue_head(&raw->empty_wait);
688
dff59b64 689 dev_set_drvdata(&cdev->dev, raw);
1da177e4
LT		 690 cdev->handler = raw3215_irq;
691
692 return 0;
693}
694
77812a27 695static void raw3215_remove (struct ccw_device *cdev)
1da177e4
LT		 696{
697 struct raw3215_info *raw;
698
699 ccw_device_set_offline(cdev);
dff59b64 700 raw = dev_get_drvdata(&cdev->dev);
1da177e4 701 if (raw) {
dff59b64 702 dev_set_drvdata(&cdev->dev, NULL);
17fd682e 703 kfree(raw->buffer);
1da177e4
LT		 704 kfree(raw);
705 }
706}
707
77812a27 708static int raw3215_set_online (struct ccw_device *cdev)
1da177e4
LT		 709{
710 struct raw3215_info *raw;
711
dff59b64 712 raw = dev_get_drvdata(&cdev->dev);
1da177e4
LT		 713 if (!raw)
714 return -ENODEV;
715
716 return raw3215_startup(raw);
717}
718
77812a27 719static int raw3215_set_offline (struct ccw_device *cdev)
1da177e4
LT		 720{
721 struct raw3215_info *raw;
722
dff59b64 723 raw = dev_get_drvdata(&cdev->dev);
1da177e4
LT		 724 if (!raw)
725 return -ENODEV;
726
727 raw3215_shutdown(raw);
728
729 return 0;
730}
731
77812a27
MS		 732static int raw3215_pm_stop(struct ccw_device *cdev)
733{
734 struct raw3215_info *raw;
735 unsigned long flags;
736
737 /* Empty the output buffer, then prevent new I/O. */
738 raw = cdev->dev.driver_data;
739 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
740 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
741 raw->flags |= RAW3215_FROZEN;
742 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
743 return 0;
744}
745
746static int raw3215_pm_start(struct ccw_device *cdev)
747{
748 struct raw3215_info *raw;
749 unsigned long flags;
750
751 /* Allow I/O again and flush output buffer. */
752 raw = cdev->dev.driver_data;
753 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
754 raw->flags &= ~RAW3215_FROZEN;
755 raw->flags |= RAW3215_FLUSHING;
756 raw3215_try_io(raw);
757 raw->flags &= ~RAW3215_FLUSHING;
758 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
759 return 0;
760}
761
1da177e4
LT		 762static struct ccw_device_id raw3215_id[] = {
763 { CCW_DEVICE(0x3215, 0) },
764 { /* end of list */ },
765};
766
767static struct ccw_driver raw3215_ccw_driver = {
768 .name = "3215",
769 .owner = THIS_MODULE,
770 .ids = raw3215_id,
771 .probe = &raw3215_probe,
772 .remove = &raw3215_remove,
773 .set_online = &raw3215_set_online,
774 .set_offline = &raw3215_set_offline,
77812a27
MS		 775 .freeze = &raw3215_pm_stop,
776 .thaw = &raw3215_pm_start,
777 .restore = &raw3215_pm_start,
1da177e4
LT		 778};
779
780#ifdef CONFIG_TN3215_CONSOLE
781/*
782 * Write a string to the 3215 console
783 */
77812a27
MS		 784static void con3215_write(struct console *co, const char *str,
785 unsigned int count)
1da177e4
LT		 786{
787 struct raw3215_info *raw;
788 int i;
789
790 if (count <= 0)
791 return;
792 raw = raw3215[0]; /* console 3215 is the first one */
793 while (count > 0) {
794 for (i = 0; i < count; i++)
795 if (str[i] == '\t' || str[i] == '\n')
796 break;
797 raw3215_write(raw, str, i);
798 count -= i;
799 str += i;
800 if (count > 0) {
801 raw3215_putchar(raw, *str);
802 count--;
803 str++;
804 }
805 }
806}
807
808static struct tty_driver *con3215_device(struct console *c, int *index)
809{
810 *index = c->index;
811 return tty3215_driver;
812}
813
814/*
2332ce1a
HS		 815 * panic() calls con3215_flush through a panic_notifier
816 * before the system enters a disabled, endless loop.
1da177e4 817 */
77812a27 818static void con3215_flush(void)
1da177e4
LT		 819{
820 struct raw3215_info *raw;
821 unsigned long flags;
822
823 raw = raw3215[0]; /* console 3215 is the first one */
77812a27
MS		 824 if (raw->flags & RAW3215_FROZEN)
825 /* The console is still frozen for suspend. */
826 if (ccw_device_force_console())
827 /* Forcing didn't work, no panic message .. */
828 return;
520a4e37 829 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4 830 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
520a4e37 831 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 832}
833
2332ce1a
HS		 834static int con3215_notify(struct notifier_block *self,
835 unsigned long event, void *data)
836{
837 con3215_flush();
838 return NOTIFY_OK;
839}
840
841static struct notifier_block on_panic_nb = {
842 .notifier_call = con3215_notify,
843 .priority = 0,
844};
845
846static struct notifier_block on_reboot_nb = {
847 .notifier_call = con3215_notify,
848 .priority = 0,
849};
850
1da177e4
LT		 851/*
852 * The console structure for the 3215 console
853 */
854static struct console con3215 = {
855 .name = "ttyS",
856 .write = con3215_write,
857 .device = con3215_device,
1da177e4
LT		 858 .flags = CON_PRINTBUFFER,
859};
860
861/*
862 * 3215 console initialization code called from console_init().
863 * NOTE: This is called before kmalloc is available.
864 */
77812a27 865static int __init con3215_init(void)
1da177e4
LT		 866{
867 struct ccw_device *cdev;
868 struct raw3215_info *raw;
869 struct raw3215_req *req;
870 int i;
871
872 /* Check if 3215 is to be the console */
873 if (!CONSOLE_IS_3215)
874 return -ENODEV;
875
876 /* Set the console mode for VM */
877 if (MACHINE_IS_VM) {
6b979de3
CB		 878 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
879 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
1da177e4
LT		 880 }
881
882 /* allocate 3215 request structures */
883 raw3215_freelist = NULL;
884 spin_lock_init(&raw3215_freelist_lock);
885 for (i = 0; i < NR_3215_REQ; i++) {
886 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req));
887 req->next = raw3215_freelist;
888 raw3215_freelist = req;
889 }
890
891 cdev = ccw_device_probe_console();
600b5d16 892 if (IS_ERR(cdev))
1da177e4
LT		 893 return -ENODEV;
894
895 raw3215[0] = raw = (struct raw3215_info *)
896 alloc_bootmem_low(sizeof(struct raw3215_info));
897 memset(raw, 0, sizeof(struct raw3215_info));
898 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
899 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
900 raw->cdev = cdev;
dff59b64 901 dev_set_drvdata(&cdev->dev, raw);
1da177e4
LT		 902 cdev->handler = raw3215_irq;
903
904 raw->flags |= RAW3215_FIXED;
1da177e4
LT		 905 init_waitqueue_head(&raw->empty_wait);
906
907 /* Request the console irq */
908 if (raw3215_startup(raw) != 0) {
909 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
910 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
911 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info));
912 raw3215[0] = NULL;
1da177e4
LT		 913 return -ENODEV;
914 }
2332ce1a
HS		 915 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
916 register_reboot_notifier(&on_reboot_nb);
1da177e4
LT		 917 register_console(&con3215);
918 return 0;
919}
920console_initcall(con3215_init);
921#endif
922
923/*
924 * tty3215_open
925 *
926 * This routine is called whenever a 3215 tty is opened.
927 */
77812a27 928static int tty3215_open(struct tty_struct *tty, struct file * filp)
1da177e4
LT		 929{
930 struct raw3215_info *raw;
931 int retval, line;
932
933 line = tty->index;
934 if ((line < 0) || (line >= NR_3215))
935 return -ENODEV;
936
937 raw = raw3215[line];
938 if (raw == NULL)
939 return -ENODEV;
940
941 tty->driver_data = raw;
942 raw->tty = tty;
943
944 tty->low_latency = 0; /* don't use bottom half for pushing chars */
945 /*
946 * Start up 3215 device
947 */
948 retval = raw3215_startup(raw);
949 if (retval)
950 return retval;
951
952 return 0;
953}
954
955/*
956 * tty3215_close()
957 *
958 * This routine is called when the 3215 tty is closed. We wait
959 * for the remaining request to be completed. Then we clean up.
960 */
77812a27 961static void tty3215_close(struct tty_struct *tty, struct file * filp)
1da177e4
LT		 962{
963 struct raw3215_info *raw;
964
965 raw = (struct raw3215_info *) tty->driver_data;
966 if (raw == NULL || tty->count > 1)
967 return;
968 tty->closing = 1;
969 /* Shutdown the terminal */
970 raw3215_shutdown(raw);
971 tty->closing = 0;
972 raw->tty = NULL;
973}
974
975/*
976 * Returns the amount of free space in the output buffer.
977 */
77812a27 978static int tty3215_write_room(struct tty_struct *tty)
1da177e4
LT		 979{
980 struct raw3215_info *raw;
981
982 raw = (struct raw3215_info *) tty->driver_data;
983
984 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
985 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
986 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
987 else
988 return 0;
989}
990
991/*
992 * String write routine for 3215 ttys
993 */
77812a27
MS		 994static int tty3215_write(struct tty_struct * tty,
995 const unsigned char *buf, int count)
1da177e4
LT		 996{
997 struct raw3215_info *raw;
998
999 if (!tty)
1000 return 0;
1001 raw = (struct raw3215_info *) tty->driver_data;
1002 raw3215_write(raw, buf, count);
1003 return count;
1004}
1005
1006/*
1007 * Put character routine for 3215 ttys
1008 */
77812a27 1009static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 1010{
1011 struct raw3215_info *raw;
1012
1013 if (!tty)
9e7c9a19 1014 return 0;
1da177e4
LT		 1015 raw = (struct raw3215_info *) tty->driver_data;
1016 raw3215_putchar(raw, ch);
9e7c9a19 1017 return 1;
1da177e4
LT		 1018}
1019
77812a27 1020static void tty3215_flush_chars(struct tty_struct *tty)
1da177e4
LT		 1021{
1022}
1023
1024/*
1025 * Returns the number of characters in the output buffer
1026 */
77812a27 1027static int tty3215_chars_in_buffer(struct tty_struct *tty)
1da177e4
LT		 1028{
1029 struct raw3215_info *raw;
1030
1031 raw = (struct raw3215_info *) tty->driver_data;
1032 return raw->count;
1033}
1034
77812a27 1035static void tty3215_flush_buffer(struct tty_struct *tty)
1da177e4
LT		 1036{
1037 struct raw3215_info *raw;
1038
1039 raw = (struct raw3215_info *) tty->driver_data;
1040 raw3215_flush_buffer(raw);
1041 tty_wakeup(tty);
1042}
1043
1044/*
1045 * Currently we don't have any io controls for 3215 ttys
1046 */
77812a27
MS		 1047static int tty3215_ioctl(struct tty_struct *tty, struct file * file,
1048 unsigned int cmd, unsigned long arg)
1da177e4
LT		 1049{
1050 if (tty->flags & (1 << TTY_IO_ERROR))
1051 return -EIO;
1052
1053 switch (cmd) {
1054 default:
1055 return -ENOIOCTLCMD;
1056 }
1057 return 0;
1058}
1059
1060/*
1061 * Disable reading from a 3215 tty
1062 */
77812a27 1063static void tty3215_throttle(struct tty_struct * tty)
1da177e4
LT		 1064{
1065 struct raw3215_info *raw;
1066
1067 raw = (struct raw3215_info *) tty->driver_data;
1068 raw->flags |= RAW3215_THROTTLED;
1069}
1070
1071/*
1072 * Enable reading from a 3215 tty
1073 */
77812a27 1074static void tty3215_unthrottle(struct tty_struct * tty)
1da177e4
LT		 1075{
1076 struct raw3215_info *raw;
1077 unsigned long flags;
1078
1079 raw = (struct raw3215_info *) tty->driver_data;
1080 if (raw->flags & RAW3215_THROTTLED) {
520a4e37 1081 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 1082 raw->flags &= ~RAW3215_THROTTLED;
1083 raw3215_try_io(raw);
520a4e37 1084 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 1085 }
1086}
1087
1088/*
1089 * Disable writing to a 3215 tty
1090 */
77812a27 1091static void tty3215_stop(struct tty_struct *tty)
1da177e4
LT		 1092{
1093 struct raw3215_info *raw;
1094
1095 raw = (struct raw3215_info *) tty->driver_data;
1096 raw->flags |= RAW3215_STOPPED;
1097}
1098
1099/*
1100 * Enable writing to a 3215 tty
1101 */
77812a27 1102static void tty3215_start(struct tty_struct *tty)
1da177e4
LT		 1103{
1104 struct raw3215_info *raw;
1105 unsigned long flags;
1106
1107 raw = (struct raw3215_info *) tty->driver_data;
1108 if (raw->flags & RAW3215_STOPPED) {
520a4e37 1109 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 1110 raw->flags &= ~RAW3215_STOPPED;
1111 raw3215_try_io(raw);
520a4e37 1112 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1da177e4
LT		 1113 }
1114}
1115
b68e31d0 1116static const struct tty_operations tty3215_ops = {
1da177e4
LT		 1117 .open = tty3215_open,
1118 .close = tty3215_close,
1119 .write = tty3215_write,
1120 .put_char = tty3215_put_char,
1121 .flush_chars = tty3215_flush_chars,
1122 .write_room = tty3215_write_room,
1123 .chars_in_buffer = tty3215_chars_in_buffer,
1124 .flush_buffer = tty3215_flush_buffer,
1125 .ioctl = tty3215_ioctl,
1126 .throttle = tty3215_throttle,
1127 .unthrottle = tty3215_unthrottle,
1128 .stop = tty3215_stop,
1129 .start = tty3215_start,
1130};
1131
1132/*
1133 * 3215 tty registration code called from tty_init().
1134 * Most kernel services (incl. kmalloc) are available at this poimt.
1135 */
77812a27 1136static int __init tty3215_init(void)
1da177e4
LT		 1137{
1138 struct tty_driver *driver;
1139 int ret;
1140
1141 if (!CONSOLE_IS_3215)
1142 return 0;
1143
1144 driver = alloc_tty_driver(NR_3215);
1145 if (!driver)
1146 return -ENOMEM;
1147
1148 ret = ccw_driver_register(&raw3215_ccw_driver);
1149 if (ret) {
1150 put_tty_driver(driver);
1151 return ret;
1152 }
1153 /*
1154 * Initialize the tty_driver structure
1155 * Entries in tty3215_driver that are NOT initialized:
1156 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1157 */
1158
1159 driver->owner = THIS_MODULE;
1160 driver->driver_name = "tty3215";
1161 driver->name = "ttyS";
1162 driver->major = TTY_MAJOR;
1163 driver->minor_start = 64;
1164 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1165 driver->subtype = SYSTEM_TYPE_TTY;
1166 driver->init_termios = tty_std_termios;
1167 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1168 driver->init_termios.c_oflag = ONLCR | XTABS;
1169 driver->init_termios.c_lflag = ISIG;
1170 driver->flags = TTY_DRIVER_REAL_RAW;
1171 tty_set_operations(driver, &tty3215_ops);
1172 ret = tty_register_driver(driver);
1173 if (ret) {
1da177e4
LT		 1174 put_tty_driver(driver);
1175 return ret;
1176 }
1177 tty3215_driver = driver;
1178 return 0;
1179}
1180
77812a27 1181static void __exit tty3215_exit(void)
1da177e4
LT		 1182{
1183 tty_unregister_driver(tty3215_driver);
1184 put_tty_driver(tty3215_driver);
1185 ccw_driver_unregister(&raw3215_ccw_driver);
1186}
1187
1188module_init(tty3215_init);
1189module_exit(tty3215_exit);
Linux 6.x block layer and io_uring tree(s)