blob: 022f17bff7314e2f2ce140ddfcfc709eb248865f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/s390/char/con3215.c
3 * 3215 line mode terminal driver.
4 *
5 * S390 version
6 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
8 *
9 * Updated:
10 * Aug-2000: Added tab support
11 * Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu)
12 */
13
14#include <linux/config.h>
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/kdev_t.h>
18#include <linux/tty.h>
19#include <linux/vt_kern.h>
20#include <linux/init.h>
21#include <linux/console.h>
22#include <linux/interrupt.h>
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) */
57
58#define TAB_STOP_SIZE 8 /* tab stop size */
59
60/*
61 * Request types for a 3215 device
62 */
63enum raw3215_type {
64 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
65};
66
67/*
68 * Request structure for a 3215 device
69 */
70struct raw3215_req {
71 enum raw3215_type type; /* type of the request */
72 int start, len; /* start index & len in output buffer */
73 int delayable; /* indication to wait for more data */
74 int residual; /* residual count for read request */
75 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
76 struct raw3215_info *info; /* pointer to main structure */
77 struct raw3215_req *next; /* pointer to next request */
78} __attribute__ ((aligned(8)));
79
80struct raw3215_info {
81 struct ccw_device *cdev; /* device for tty driver */
82 spinlock_t *lock; /* pointer to irq lock */
83 int flags; /* state flags */
84 char *buffer; /* pointer to output buffer */
85 char *inbuf; /* pointer to input buffer */
86 int head; /* first free byte in output buffer */
87 int count; /* number of bytes in output buffer */
88 int written; /* number of bytes in write requests */
89 struct tty_struct *tty; /* pointer to tty structure if present */
90 struct tasklet_struct tasklet;
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 */
95 char *message; /* pending message from raw3215_irq */
96 int msg_dstat; /* dstat for pending message */
97 int msg_cstat; /* cstat for pending message */
98 int line_pos; /* position on the line (for tabs) */
99 char ubuffer[80]; /* copy_from_user buffer */
100};
101
102/* array of 3215 devices structures */
103static struct raw3215_info *raw3215[NR_3215];
104/* spinlock to protect the raw3215 array */
105static DEFINE_SPINLOCK(raw3215_device_lock);
106/* list of free request structures */
107static struct raw3215_req *raw3215_freelist;
108/* spinlock to protect free list */
109static spinlock_t raw3215_freelist_lock;
110
111static struct tty_driver *tty3215_driver;
112
113/*
114 * Get a request structure from the free list
115 */
116static inline struct raw3215_req *
117raw3215_alloc_req(void) {
118 struct raw3215_req *req;
119 unsigned long flags;
120
121 spin_lock_irqsave(&raw3215_freelist_lock, flags);
122 req = raw3215_freelist;
123 raw3215_freelist = req->next;
124 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
125 return req;
126}
127
128/*
129 * Put a request structure back to the free list
130 */
131static inline void
132raw3215_free_req(struct raw3215_req *req) {
133 unsigned long flags;
134
135 if (req->type == RAW3215_FREE)
136 return; /* don't free a free request */
137 req->type = RAW3215_FREE;
138 spin_lock_irqsave(&raw3215_freelist_lock, flags);
139 req->next = raw3215_freelist;
140 raw3215_freelist = req;
141 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
142}
143
144/*
145 * Set up a read request that reads up to 160 byte from the 3215 device.
146 * If there is a queued read request it is used, but that shouldn't happen
147 * because a 3215 terminal won't accept a new read before the old one is
148 * completed.
149 */
150static void
151raw3215_mk_read_req(struct raw3215_info *raw)
152{
153 struct raw3215_req *req;
154 struct ccw1 *ccw;
155
156 /* there can only be ONE read request at a time */
157 req = raw->queued_read;
158 if (req == NULL) {
159 /* no queued read request, use new req structure */
160 req = raw3215_alloc_req();
161 req->type = RAW3215_READ;
162 req->info = raw;
163 raw->queued_read = req;
164 }
165
166 ccw = req->ccws;
167 ccw->cmd_code = 0x0A; /* read inquiry */
168 ccw->flags = 0x20; /* ignore incorrect length */
169 ccw->count = 160;
170 ccw->cda = (__u32) __pa(raw->inbuf);
171}
172
173/*
174 * Set up a write request with the information from the main structure.
175 * A ccw chain is created that writes as much as possible from the output
176 * buffer to the 3215 device. If a queued write exists it is replaced by
177 * the new, probably lengthened request.
178 */
179static void
180raw3215_mk_write_req(struct raw3215_info *raw)
181{
182 struct raw3215_req *req;
183 struct ccw1 *ccw;
184 int len, count, ix, lines;
185
186 if (raw->count <= raw->written)
187 return;
188 /* check if there is a queued write request */
189 req = raw->queued_write;
190 if (req == NULL) {
191 /* no queued write request, use new req structure */
192 req = raw3215_alloc_req();
193 req->type = RAW3215_WRITE;
194 req->info = raw;
195 raw->queued_write = req;
196 } else {
197 raw->written -= req->len;
198 }
199
200 ccw = req->ccws;
201 req->start = (raw->head - raw->count + raw->written) &
202 (RAW3215_BUFFER_SIZE - 1);
203 /*
204 * now we have to count newlines. We can at max accept
205 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
206 * a restriction in VM
207 */
208 lines = 0;
209 ix = req->start;
210 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
211 if (raw->buffer[ix] == 0x15)
212 lines++;
213 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
214 }
215 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
216 if (len > RAW3215_MAX_BYTES)
217 len = RAW3215_MAX_BYTES;
218 req->len = len;
219 raw->written += len;
220
221 /* set the indication if we should try to enlarge this request */
222 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
223
224 ix = req->start;
225 while (len > 0) {
226 if (ccw > req->ccws)
227 ccw[-1].flags |= 0x40; /* use command chaining */
228 ccw->cmd_code = 0x01; /* write, auto carrier return */
229 ccw->flags = 0x20; /* ignore incorrect length ind. */
230 ccw->cda =
231 (__u32) __pa(raw->buffer + ix);
232 count = len;
233 if (ix + count > RAW3215_BUFFER_SIZE)
234 count = RAW3215_BUFFER_SIZE - ix;
235 ccw->count = count;
236 len -= count;
237 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
238 ccw++;
239 }
240 /*
241 * Add a NOP to the channel program. 3215 devices are purely
242 * emulated and its much better to avoid the channel end
243 * interrupt in this case.
244 */
245 if (ccw > req->ccws)
246 ccw[-1].flags |= 0x40; /* use command chaining */
247 ccw->cmd_code = 0x03; /* NOP */
248 ccw->flags = 0;
249 ccw->cda = 0;
250 ccw->count = 1;
251}
252
253/*
254 * Start a read or a write request
255 */
256static void
257raw3215_start_io(struct raw3215_info *raw)
258{
259 struct raw3215_req *req;
260 int res;
261
262 req = raw->queued_read;
263 if (req != NULL &&
264 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
265 /* dequeue request */
266 raw->queued_read = NULL;
267 res = ccw_device_start(raw->cdev, req->ccws,
268 (unsigned long) req, 0, 0);
269 if (res != 0) {
270 /* do_IO failed, put request back to queue */
271 raw->queued_read = req;
272 } else {
273 raw->flags |= RAW3215_WORKING;
274 }
275 }
276 req = raw->queued_write;
277 if (req != NULL &&
278 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
279 /* dequeue request */
280 raw->queued_write = NULL;
281 res = ccw_device_start(raw->cdev, req->ccws,
282 (unsigned long) req, 0, 0);
283 if (res != 0) {
284 /* do_IO failed, put request back to queue */
285 raw->queued_write = req;
286 } else {
287 raw->flags |= RAW3215_WORKING;
288 }
289 }
290}
291
292/*
293 * Function to start a delayed output after RAW3215_TIMEOUT seconds
294 */
295static void
296raw3215_timeout(unsigned long __data)
297{
298 struct raw3215_info *raw = (struct raw3215_info *) __data;
299 unsigned long flags;
300
301 spin_lock_irqsave(raw->lock, flags);
302 if (raw->flags & RAW3215_TIMER_RUNS) {
303 del_timer(&raw->timer);
304 raw->flags &= ~RAW3215_TIMER_RUNS;
305 raw3215_mk_write_req(raw);
306 raw3215_start_io(raw);
307 }
308 spin_unlock_irqrestore(raw->lock, flags);
309}
310
311/*
312 * Function to conditionally start an IO. A read is started immediately,
313 * a write is only started immediately if the flush flag is on or the
314 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
315 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
316 */
317static inline void
318raw3215_try_io(struct raw3215_info *raw)
319{
320 if (!(raw->flags & RAW3215_ACTIVE))
321 return;
322 if (raw->queued_read != NULL)
323 raw3215_start_io(raw);
324 else if (raw->queued_write != NULL) {
325 if ((raw->queued_write->delayable == 0) ||
326 (raw->flags & RAW3215_FLUSHING)) {
327 /* execute write requests bigger than minimum size */
328 raw3215_start_io(raw);
329 if (raw->flags & RAW3215_TIMER_RUNS) {
330 del_timer(&raw->timer);
331 raw->flags &= ~RAW3215_TIMER_RUNS;
332 }
333 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
334 /* delay small writes */
335 init_timer(&raw->timer);
336 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
337 raw->timer.data = (unsigned long) raw;
338 raw->timer.function = raw3215_timeout;
339 add_timer(&raw->timer);
340 raw->flags |= RAW3215_TIMER_RUNS;
341 }
342 }
343}
344
345/*
346 * The bottom half handler routine for 3215 devices. It tries to start
347 * the next IO and wakes up processes waiting on the tty.
348 */
349static void
350raw3215_tasklet(void *data)
351{
352 struct raw3215_info *raw;
353 struct tty_struct *tty;
354 unsigned long flags;
355
356 raw = (struct raw3215_info *) data;
357 spin_lock_irqsave(raw->lock, flags);
358 raw3215_mk_write_req(raw);
359 raw3215_try_io(raw);
360 spin_unlock_irqrestore(raw->lock, flags);
361 /* Check for pending message from raw3215_irq */
362 if (raw->message != NULL) {
363 printk(raw->message, raw->msg_dstat, raw->msg_cstat);
364 raw->message = NULL;
365 }
366 tty = raw->tty;
367 if (tty != NULL &&
368 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
369 tty_wakeup(tty);
370 }
371}
372
373/*
374 * Interrupt routine, called from common io layer
375 */
376static void
377raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
378{
379 struct raw3215_info *raw;
380 struct raw3215_req *req;
381 struct tty_struct *tty;
382 int cstat, dstat;
383 int count, slen;
384
385 raw = cdev->dev.driver_data;
386 req = (struct raw3215_req *) intparm;
387 cstat = irb->scsw.cstat;
388 dstat = irb->scsw.dstat;
389 if (cstat != 0) {
390 raw->message = KERN_WARNING
391 "Got nonzero channel status in raw3215_irq "
392 "(dev sts 0x%2x, sch sts 0x%2x)";
393 raw->msg_dstat = dstat;
394 raw->msg_cstat = cstat;
395 tasklet_schedule(&raw->tasklet);
396 }
397 if (dstat & 0x01) { /* we got a unit exception */
398 dstat &= ~0x01; /* we can ignore it */
399 }
400 switch (dstat) {
401 case 0x80:
402 if (cstat != 0)
403 break;
404 /* Attention interrupt, someone hit the enter key */
405 raw3215_mk_read_req(raw);
406 if (MACHINE_IS_P390)
407 memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
408 tasklet_schedule(&raw->tasklet);
409 break;
410 case 0x08:
411 case 0x0C:
412 /* Channel end interrupt. */
413 if ((raw = req->info) == NULL)
414 return; /* That shouldn't happen ... */
415 if (req->type == RAW3215_READ) {
416 /* store residual count, then wait for device end */
417 req->residual = irb->scsw.count;
418 }
419 if (dstat == 0x08)
420 break;
421 case 0x04:
422 /* Device end interrupt. */
423 if ((raw = req->info) == NULL)
424 return; /* That shouldn't happen ... */
425 if (req->type == RAW3215_READ && raw->tty != NULL) {
426 unsigned int cchar;
427
428 tty = raw->tty;
429 count = 160 - req->residual;
430 if (MACHINE_IS_P390) {
431 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE);
432 if (count > slen)
433 count = slen;
434 } else
435 if (count >= TTY_FLIPBUF_SIZE - tty->flip.count)
436 count = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
437 EBCASC(raw->inbuf, count);
438 cchar = ctrlchar_handle(raw->inbuf, count, tty);
439 switch (cchar & CTRLCHAR_MASK) {
440 case CTRLCHAR_SYSRQ:
441 break;
442
443 case CTRLCHAR_CTRL:
444 tty->flip.count++;
445 *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
446 *tty->flip.char_buf_ptr++ = cchar;
447 tty_flip_buffer_push(raw->tty);
448 break;
449
450 case CTRLCHAR_NONE:
451 memcpy(tty->flip.char_buf_ptr,
452 raw->inbuf, count);
453 if (count < 2 ||
454 (strncmp(raw->inbuf+count-2, "^n", 2) &&
455 strncmp(raw->inbuf+count-2, "\252n", 2)) ) {
456 /* don't add the auto \n */
457 tty->flip.char_buf_ptr[count] = '\n';
458 memset(tty->flip.flag_buf_ptr,
459 TTY_NORMAL, count + 1);
460 count++;
461 } else
462 count-=2;
463 tty->flip.char_buf_ptr += count;
464 tty->flip.flag_buf_ptr += count;
465 tty->flip.count += count;
466 tty_flip_buffer_push(raw->tty);
467 break;
468 }
469 } else if (req->type == RAW3215_WRITE) {
470 raw->count -= req->len;
471 raw->written -= req->len;
472 }
473 raw->flags &= ~RAW3215_WORKING;
474 raw3215_free_req(req);
475 /* check for empty wait */
476 if (waitqueue_active(&raw->empty_wait) &&
477 raw->queued_write == NULL &&
478 raw->queued_read == NULL) {
479 wake_up_interruptible(&raw->empty_wait);
480 }
481 tasklet_schedule(&raw->tasklet);
482 break;
483 default:
484 /* Strange interrupt, I'll do my best to clean up */
485 if (req != NULL && req->type != RAW3215_FREE) {
486 if (req->type == RAW3215_WRITE) {
487 raw->count -= req->len;
488 raw->written -= req->len;
489 }
490 raw->flags &= ~RAW3215_WORKING;
491 raw3215_free_req(req);
492 }
493 raw->message = KERN_WARNING
494 "Spurious interrupt in in raw3215_irq "
495 "(dev sts 0x%2x, sch sts 0x%2x)";
496 raw->msg_dstat = dstat;
497 raw->msg_cstat = cstat;
498 tasklet_schedule(&raw->tasklet);
499 }
500 return;
501}
502
503/*
504 * Wait until length bytes are available int the output buffer.
505 * Has to be called with the s390irq lock held. Can be called
506 * disabled.
507 */
508static void
509raw3215_make_room(struct raw3215_info *raw, unsigned int length)
510{
511 while (RAW3215_BUFFER_SIZE - raw->count < length) {
512 /* there might be a request pending */
513 raw->flags |= RAW3215_FLUSHING;
514 raw3215_mk_write_req(raw);
515 raw3215_try_io(raw);
516 raw->flags &= ~RAW3215_FLUSHING;
517#ifdef CONFIG_TN3215_CONSOLE
518 wait_cons_dev();
519#endif
520 /* Enough room freed up ? */
521 if (RAW3215_BUFFER_SIZE - raw->count >= length)
522 break;
523 /* there might be another cpu waiting for the lock */
524 spin_unlock(raw->lock);
525 udelay(100);
526 spin_lock(raw->lock);
527 }
528}
529
530/*
531 * String write routine for 3215 devices
532 */
533static void
534raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length)
535{
536 unsigned long flags;
537 int c, count;
538
539 while (length > 0) {
540 spin_lock_irqsave(raw->lock, flags);
541 count = (length > RAW3215_BUFFER_SIZE) ?
542 RAW3215_BUFFER_SIZE : length;
543 length -= count;
544
545 raw3215_make_room(raw, count);
546
547 /* copy string to output buffer and convert it to EBCDIC */
548 while (1) {
549 c = min_t(int, count,
550 min(RAW3215_BUFFER_SIZE - raw->count,
551 RAW3215_BUFFER_SIZE - raw->head));
552 if (c <= 0)
553 break;
554 memcpy(raw->buffer + raw->head, str, c);
555 ASCEBC(raw->buffer + raw->head, c);
556 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
557 raw->count += c;
558 raw->line_pos += c;
559 str += c;
560 count -= c;
561 }
562 if (!(raw->flags & RAW3215_WORKING)) {
563 raw3215_mk_write_req(raw);
564 /* start or queue request */
565 raw3215_try_io(raw);
566 }
567 spin_unlock_irqrestore(raw->lock, flags);
568 }
569}
570
571/*
572 * Put character routine for 3215 devices
573 */
574static void
575raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
576{
577 unsigned long flags;
578 unsigned int length, i;
579
580 spin_lock_irqsave(raw->lock, flags);
581 if (ch == '\t') {
582 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
583 raw->line_pos += length;
584 ch = ' ';
585 } else if (ch == '\n') {
586 length = 1;
587 raw->line_pos = 0;
588 } else {
589 length = 1;
590 raw->line_pos++;
591 }
592 raw3215_make_room(raw, length);
593
594 for (i = 0; i < length; i++) {
595 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
596 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
597 raw->count++;
598 }
599 if (!(raw->flags & RAW3215_WORKING)) {
600 raw3215_mk_write_req(raw);
601 /* start or queue request */
602 raw3215_try_io(raw);
603 }
604 spin_unlock_irqrestore(raw->lock, flags);
605}
606
607/*
608 * Flush routine, it simply sets the flush flag and tries to start
609 * pending IO.
610 */
611static void
612raw3215_flush_buffer(struct raw3215_info *raw)
613{
614 unsigned long flags;
615
616 spin_lock_irqsave(raw->lock, flags);
617 if (raw->count > 0) {
618 raw->flags |= RAW3215_FLUSHING;
619 raw3215_try_io(raw);
620 raw->flags &= ~RAW3215_FLUSHING;
621 }
622 spin_unlock_irqrestore(raw->lock, flags);
623}
624
625/*
626 * Fire up a 3215 device.
627 */
628static int
629raw3215_startup(struct raw3215_info *raw)
630{
631 unsigned long flags;
632
633 if (raw->flags & RAW3215_ACTIVE)
634 return 0;
635 raw->line_pos = 0;
636 raw->flags |= RAW3215_ACTIVE;
637 spin_lock_irqsave(raw->lock, flags);
638 raw3215_try_io(raw);
639 spin_unlock_irqrestore(raw->lock, flags);
640
641 return 0;
642}
643
644/*
645 * Shutdown a 3215 device.
646 */
647static void
648raw3215_shutdown(struct raw3215_info *raw)
649{
650 DECLARE_WAITQUEUE(wait, current);
651 unsigned long flags;
652
653 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
654 return;
655 /* Wait for outstanding requests, then free irq */
656 spin_lock_irqsave(raw->lock, flags);
657 if ((raw->flags & RAW3215_WORKING) ||
658 raw->queued_write != NULL ||
659 raw->queued_read != NULL) {
660 raw->flags |= RAW3215_CLOSING;
661 add_wait_queue(&raw->empty_wait, &wait);
662 set_current_state(TASK_INTERRUPTIBLE);
663 spin_unlock_irqrestore(raw->lock, flags);
664 schedule();
665 spin_lock_irqsave(raw->lock, flags);
666 remove_wait_queue(&raw->empty_wait, &wait);
667 set_current_state(TASK_RUNNING);
668 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING);
669 }
670 spin_unlock_irqrestore(raw->lock, flags);
671}
672
673static int
674raw3215_probe (struct ccw_device *cdev)
675{
676 struct raw3215_info *raw;
677 int line;
678
679 raw = kmalloc(sizeof(struct raw3215_info) +
680 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
681 if (raw == NULL)
682 return -ENOMEM;
683
684 spin_lock(&raw3215_device_lock);
685 for (line = 0; line < NR_3215; line++) {
686 if (!raw3215[line]) {
687 raw3215[line] = raw;
688 break;
689 }
690 }
691 spin_unlock(&raw3215_device_lock);
692 if (line == NR_3215) {
693 kfree(raw);
694 return -ENODEV;
695 }
696
697 raw->cdev = cdev;
698 raw->lock = get_ccwdev_lock(cdev);
699 raw->inbuf = (char *) raw + sizeof(struct raw3215_info);
700 memset(raw, 0, sizeof(struct raw3215_info));
701 raw->buffer = (char *) kmalloc(RAW3215_BUFFER_SIZE,
702 GFP_KERNEL|GFP_DMA);
703 if (raw->buffer == NULL) {
704 spin_lock(&raw3215_device_lock);
705 raw3215[line] = 0;
706 spin_unlock(&raw3215_device_lock);
707 kfree(raw);
708 return -ENOMEM;
709 }
710 tasklet_init(&raw->tasklet,
711 (void (*)(unsigned long)) raw3215_tasklet,
712 (unsigned long) raw);
713 init_waitqueue_head(&raw->empty_wait);
714
715 cdev->dev.driver_data = raw;
716 cdev->handler = raw3215_irq;
717
718 return 0;
719}
720
721static void
722raw3215_remove (struct ccw_device *cdev)
723{
724 struct raw3215_info *raw;
725
726 ccw_device_set_offline(cdev);
727 raw = cdev->dev.driver_data;
728 if (raw) {
729 cdev->dev.driver_data = NULL;
730 if (raw->buffer)
731 kfree(raw->buffer);
732 kfree(raw);
733 }
734}
735
736static int
737raw3215_set_online (struct ccw_device *cdev)
738{
739 struct raw3215_info *raw;
740
741 raw = cdev->dev.driver_data;
742 if (!raw)
743 return -ENODEV;
744
745 return raw3215_startup(raw);
746}
747
748static int
749raw3215_set_offline (struct ccw_device *cdev)
750{
751 struct raw3215_info *raw;
752
753 raw = cdev->dev.driver_data;
754 if (!raw)
755 return -ENODEV;
756
757 raw3215_shutdown(raw);
758
759 return 0;
760}
761
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,
775};
776
777#ifdef CONFIG_TN3215_CONSOLE
778/*
779 * Write a string to the 3215 console
780 */
781static void
782con3215_write(struct console *co, const char *str, unsigned int count)
783{
784 struct raw3215_info *raw;
785 int i;
786
787 if (count <= 0)
788 return;
789 raw = raw3215[0]; /* console 3215 is the first one */
790 while (count > 0) {
791 for (i = 0; i < count; i++)
792 if (str[i] == '\t' || str[i] == '\n')
793 break;
794 raw3215_write(raw, str, i);
795 count -= i;
796 str += i;
797 if (count > 0) {
798 raw3215_putchar(raw, *str);
799 count--;
800 str++;
801 }
802 }
803}
804
805static struct tty_driver *con3215_device(struct console *c, int *index)
806{
807 *index = c->index;
808 return tty3215_driver;
809}
810
811/*
812 * panic() calls console_unblank before the system enters a
813 * disabled, endless loop.
814 */
815static void
816con3215_unblank(void)
817{
818 struct raw3215_info *raw;
819 unsigned long flags;
820
821 raw = raw3215[0]; /* console 3215 is the first one */
822 spin_lock_irqsave(raw->lock, flags);
823 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
824 spin_unlock_irqrestore(raw->lock, flags);
825}
826
827static int __init
828con3215_consetup(struct console *co, char *options)
829{
830 return 0;
831}
832
833/*
834 * The console structure for the 3215 console
835 */
836static struct console con3215 = {
837 .name = "ttyS",
838 .write = con3215_write,
839 .device = con3215_device,
840 .unblank = con3215_unblank,
841 .setup = con3215_consetup,
842 .flags = CON_PRINTBUFFER,
843};
844
845/*
846 * 3215 console initialization code called from console_init().
847 * NOTE: This is called before kmalloc is available.
848 */
849static int __init
850con3215_init(void)
851{
852 struct ccw_device *cdev;
853 struct raw3215_info *raw;
854 struct raw3215_req *req;
855 int i;
856
857 /* Check if 3215 is to be the console */
858 if (!CONSOLE_IS_3215)
859 return -ENODEV;
860
861 /* Set the console mode for VM */
862 if (MACHINE_IS_VM) {
863 cpcmd("TERM CONMODE 3215", NULL, 0);
864 cpcmd("TERM AUTOCR OFF", NULL, 0);
865 }
866
867 /* allocate 3215 request structures */
868 raw3215_freelist = NULL;
869 spin_lock_init(&raw3215_freelist_lock);
870 for (i = 0; i < NR_3215_REQ; i++) {
871 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req));
872 req->next = raw3215_freelist;
873 raw3215_freelist = req;
874 }
875
876 cdev = ccw_device_probe_console();
877 if (!cdev)
878 return -ENODEV;
879
880 raw3215[0] = raw = (struct raw3215_info *)
881 alloc_bootmem_low(sizeof(struct raw3215_info));
882 memset(raw, 0, sizeof(struct raw3215_info));
883 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
884 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
885 raw->cdev = cdev;
886 raw->lock = get_ccwdev_lock(cdev);
887 cdev->dev.driver_data = raw;
888 cdev->handler = raw3215_irq;
889
890 raw->flags |= RAW3215_FIXED;
891 tasklet_init(&raw->tasklet,
892 (void (*)(unsigned long)) raw3215_tasklet,
893 (unsigned long) raw);
894 init_waitqueue_head(&raw->empty_wait);
895
896 /* Request the console irq */
897 if (raw3215_startup(raw) != 0) {
898 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
899 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
900 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info));
901 raw3215[0] = NULL;
902 printk("Couldn't find a 3215 console device\n");
903 return -ENODEV;
904 }
905 register_console(&con3215);
906 return 0;
907}
908console_initcall(con3215_init);
909#endif
910
911/*
912 * tty3215_open
913 *
914 * This routine is called whenever a 3215 tty is opened.
915 */
916static int
917tty3215_open(struct tty_struct *tty, struct file * filp)
918{
919 struct raw3215_info *raw;
920 int retval, line;
921
922 line = tty->index;
923 if ((line < 0) || (line >= NR_3215))
924 return -ENODEV;
925
926 raw = raw3215[line];
927 if (raw == NULL)
928 return -ENODEV;
929
930 tty->driver_data = raw;
931 raw->tty = tty;
932
933 tty->low_latency = 0; /* don't use bottom half for pushing chars */
934 /*
935 * Start up 3215 device
936 */
937 retval = raw3215_startup(raw);
938 if (retval)
939 return retval;
940
941 return 0;
942}
943
944/*
945 * tty3215_close()
946 *
947 * This routine is called when the 3215 tty is closed. We wait
948 * for the remaining request to be completed. Then we clean up.
949 */
950static void
951tty3215_close(struct tty_struct *tty, struct file * filp)
952{
953 struct raw3215_info *raw;
954
955 raw = (struct raw3215_info *) tty->driver_data;
956 if (raw == NULL || tty->count > 1)
957 return;
958 tty->closing = 1;
959 /* Shutdown the terminal */
960 raw3215_shutdown(raw);
961 tty->closing = 0;
962 raw->tty = NULL;
963}
964
965/*
966 * Returns the amount of free space in the output buffer.
967 */
968static int
969tty3215_write_room(struct tty_struct *tty)
970{
971 struct raw3215_info *raw;
972
973 raw = (struct raw3215_info *) tty->driver_data;
974
975 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
976 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
977 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
978 else
979 return 0;
980}
981
982/*
983 * String write routine for 3215 ttys
984 */
985static int
986tty3215_write(struct tty_struct * tty,
987 const unsigned char *buf, int count)
988{
989 struct raw3215_info *raw;
990
991 if (!tty)
992 return 0;
993 raw = (struct raw3215_info *) tty->driver_data;
994 raw3215_write(raw, buf, count);
995 return count;
996}
997
998/*
999 * Put character routine for 3215 ttys
1000 */
1001static void
1002tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1003{
1004 struct raw3215_info *raw;
1005
1006 if (!tty)
1007 return;
1008 raw = (struct raw3215_info *) tty->driver_data;
1009 raw3215_putchar(raw, ch);
1010}
1011
1012static void
1013tty3215_flush_chars(struct tty_struct *tty)
1014{
1015}
1016
1017/*
1018 * Returns the number of characters in the output buffer
1019 */
1020static int
1021tty3215_chars_in_buffer(struct tty_struct *tty)
1022{
1023 struct raw3215_info *raw;
1024
1025 raw = (struct raw3215_info *) tty->driver_data;
1026 return raw->count;
1027}
1028
1029static void
1030tty3215_flush_buffer(struct tty_struct *tty)
1031{
1032 struct raw3215_info *raw;
1033
1034 raw = (struct raw3215_info *) tty->driver_data;
1035 raw3215_flush_buffer(raw);
1036 tty_wakeup(tty);
1037}
1038
1039/*
1040 * Currently we don't have any io controls for 3215 ttys
1041 */
1042static int
1043tty3215_ioctl(struct tty_struct *tty, struct file * file,
1044 unsigned int cmd, unsigned long arg)
1045{
1046 if (tty->flags & (1 << TTY_IO_ERROR))
1047 return -EIO;
1048
1049 switch (cmd) {
1050 default:
1051 return -ENOIOCTLCMD;
1052 }
1053 return 0;
1054}
1055
1056/*
1057 * Disable reading from a 3215 tty
1058 */
1059static void
1060tty3215_throttle(struct tty_struct * tty)
1061{
1062 struct raw3215_info *raw;
1063
1064 raw = (struct raw3215_info *) tty->driver_data;
1065 raw->flags |= RAW3215_THROTTLED;
1066}
1067
1068/*
1069 * Enable reading from a 3215 tty
1070 */
1071static void
1072tty3215_unthrottle(struct tty_struct * tty)
1073{
1074 struct raw3215_info *raw;
1075 unsigned long flags;
1076
1077 raw = (struct raw3215_info *) tty->driver_data;
1078 if (raw->flags & RAW3215_THROTTLED) {
1079 spin_lock_irqsave(raw->lock, flags);
1080 raw->flags &= ~RAW3215_THROTTLED;
1081 raw3215_try_io(raw);
1082 spin_unlock_irqrestore(raw->lock, flags);
1083 }
1084}
1085
1086/*
1087 * Disable writing to a 3215 tty
1088 */
1089static void
1090tty3215_stop(struct tty_struct *tty)
1091{
1092 struct raw3215_info *raw;
1093
1094 raw = (struct raw3215_info *) tty->driver_data;
1095 raw->flags |= RAW3215_STOPPED;
1096}
1097
1098/*
1099 * Enable writing to a 3215 tty
1100 */
1101static void
1102tty3215_start(struct tty_struct *tty)
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) {
1109 spin_lock_irqsave(raw->lock, flags);
1110 raw->flags &= ~RAW3215_STOPPED;
1111 raw3215_try_io(raw);
1112 spin_unlock_irqrestore(raw->lock, flags);
1113 }
1114}
1115
1116static struct tty_operations tty3215_ops = {
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 */
1136int __init
1137tty3215_init(void)
1138{
1139 struct tty_driver *driver;
1140 int ret;
1141
1142 if (!CONSOLE_IS_3215)
1143 return 0;
1144
1145 driver = alloc_tty_driver(NR_3215);
1146 if (!driver)
1147 return -ENOMEM;
1148
1149 ret = ccw_driver_register(&raw3215_ccw_driver);
1150 if (ret) {
1151 put_tty_driver(driver);
1152 return ret;
1153 }
1154 /*
1155 * Initialize the tty_driver structure
1156 * Entries in tty3215_driver that are NOT initialized:
1157 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1158 */
1159
1160 driver->owner = THIS_MODULE;
1161 driver->driver_name = "tty3215";
1162 driver->name = "ttyS";
1163 driver->major = TTY_MAJOR;
1164 driver->minor_start = 64;
1165 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1166 driver->subtype = SYSTEM_TYPE_TTY;
1167 driver->init_termios = tty_std_termios;
1168 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1169 driver->init_termios.c_oflag = ONLCR | XTABS;
1170 driver->init_termios.c_lflag = ISIG;
1171 driver->flags = TTY_DRIVER_REAL_RAW;
1172 tty_set_operations(driver, &tty3215_ops);
1173 ret = tty_register_driver(driver);
1174 if (ret) {
1175 printk("Couldn't register tty3215 driver\n");
1176 put_tty_driver(driver);
1177 return ret;
1178 }
1179 tty3215_driver = driver;
1180 return 0;
1181}
1182
1183static void __exit
1184tty3215_exit(void)
1185{
1186 tty_unregister_driver(tty3215_driver);
1187 put_tty_driver(tty3215_driver);
1188 ccw_driver_unregister(&raw3215_ccw_driver);
1189}
1190
1191module_init(tty3215_init);
1192module_exit(tty3215_exit);