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1da177e4 LT |
1 | /* |
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> | |
33f0f88f | 19 | #include <linux/tty_flip.h> |
1da177e4 LT |
20 | #include <linux/vt_kern.h> |
21 | #include <linux/init.h> | |
22 | #include <linux/console.h> | |
23 | #include <linux/interrupt.h> | |
24 | ||
25 | #include <linux/slab.h> | |
26 | #include <linux/bootmem.h> | |
27 | ||
28 | #include <asm/ccwdev.h> | |
29 | #include <asm/cio.h> | |
30 | #include <asm/io.h> | |
31 | #include <asm/ebcdic.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/delay.h> | |
34 | #include <asm/cpcmd.h> | |
35 | #include <asm/setup.h> | |
36 | ||
37 | #include "ctrlchar.h" | |
38 | ||
39 | #define NR_3215 1 | |
40 | #define NR_3215_REQ (4*NR_3215) | |
41 | #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ | |
42 | #define RAW3215_INBUF_SIZE 256 /* input buffer size */ | |
43 | #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ | |
44 | #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ | |
45 | #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ | |
46 | #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ | |
47 | #define RAW3215_NR_CCWS 3 | |
48 | #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ | |
49 | ||
50 | #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ | |
51 | #define RAW3215_ACTIVE 2 /* set if the device is in use */ | |
52 | #define RAW3215_WORKING 4 /* set if a request is being worked on */ | |
53 | #define RAW3215_THROTTLED 8 /* set if reading is disabled */ | |
54 | #define RAW3215_STOPPED 16 /* set if writing is disabled */ | |
55 | #define RAW3215_CLOSING 32 /* set while in close process */ | |
56 | #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ | |
57 | #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ | |
58 | ||
59 | #define TAB_STOP_SIZE 8 /* tab stop size */ | |
60 | ||
61 | /* | |
62 | * Request types for a 3215 device | |
63 | */ | |
64 | enum raw3215_type { | |
65 | RAW3215_FREE, RAW3215_READ, RAW3215_WRITE | |
66 | }; | |
67 | ||
68 | /* | |
69 | * Request structure for a 3215 device | |
70 | */ | |
71 | struct 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 | ||
81 | struct 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 */ | |
91 | struct tasklet_struct tasklet; | |
92 | struct raw3215_req *queued_read; /* pointer to queued read requests */ | |
93 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
94 | wait_queue_head_t empty_wait; /* wait queue for flushing */ | |
95 | struct timer_list timer; /* timer for delayed output */ | |
96 | char *message; /* pending message from raw3215_irq */ | |
97 | int msg_dstat; /* dstat for pending message */ | |
98 | int msg_cstat; /* cstat for pending message */ | |
99 | int line_pos; /* position on the line (for tabs) */ | |
100 | char ubuffer[80]; /* copy_from_user buffer */ | |
101 | }; | |
102 | ||
103 | /* array of 3215 devices structures */ | |
104 | static struct raw3215_info *raw3215[NR_3215]; | |
105 | /* spinlock to protect the raw3215 array */ | |
106 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
107 | /* list of free request structures */ | |
108 | static struct raw3215_req *raw3215_freelist; | |
109 | /* spinlock to protect free list */ | |
110 | static spinlock_t raw3215_freelist_lock; | |
111 | ||
112 | static struct tty_driver *tty3215_driver; | |
113 | ||
114 | /* | |
115 | * Get a request structure from the free list | |
116 | */ | |
117 | static inline struct raw3215_req * | |
118 | raw3215_alloc_req(void) { | |
119 | struct raw3215_req *req; | |
120 | unsigned long flags; | |
121 | ||
122 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
123 | req = raw3215_freelist; | |
124 | raw3215_freelist = req->next; | |
125 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
126 | return req; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Put a request structure back to the free list | |
131 | */ | |
132 | static inline void | |
133 | raw3215_free_req(struct raw3215_req *req) { | |
134 | unsigned long flags; | |
135 | ||
136 | if (req->type == RAW3215_FREE) | |
137 | return; /* don't free a free request */ | |
138 | req->type = RAW3215_FREE; | |
139 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
140 | req->next = raw3215_freelist; | |
141 | raw3215_freelist = req; | |
142 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
147 | * If there is a queued read request it is used, but that shouldn't happen | |
148 | * because a 3215 terminal won't accept a new read before the old one is | |
149 | * completed. | |
150 | */ | |
151 | static void | |
152 | raw3215_mk_read_req(struct raw3215_info *raw) | |
153 | { | |
154 | struct raw3215_req *req; | |
155 | struct ccw1 *ccw; | |
156 | ||
157 | /* there can only be ONE read request at a time */ | |
158 | req = raw->queued_read; | |
159 | if (req == NULL) { | |
160 | /* no queued read request, use new req structure */ | |
161 | req = raw3215_alloc_req(); | |
162 | req->type = RAW3215_READ; | |
163 | req->info = raw; | |
164 | raw->queued_read = req; | |
165 | } | |
166 | ||
167 | ccw = req->ccws; | |
168 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
169 | ccw->flags = 0x20; /* ignore incorrect length */ | |
170 | ccw->count = 160; | |
171 | ccw->cda = (__u32) __pa(raw->inbuf); | |
172 | } | |
173 | ||
174 | /* | |
175 | * Set up a write request with the information from the main structure. | |
176 | * A ccw chain is created that writes as much as possible from the output | |
177 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
178 | * the new, probably lengthened request. | |
179 | */ | |
180 | static void | |
181 | raw3215_mk_write_req(struct raw3215_info *raw) | |
182 | { | |
183 | struct raw3215_req *req; | |
184 | struct ccw1 *ccw; | |
185 | int len, count, ix, lines; | |
186 | ||
187 | if (raw->count <= raw->written) | |
188 | return; | |
189 | /* check if there is a queued write request */ | |
190 | req = raw->queued_write; | |
191 | if (req == NULL) { | |
192 | /* no queued write request, use new req structure */ | |
193 | req = raw3215_alloc_req(); | |
194 | req->type = RAW3215_WRITE; | |
195 | req->info = raw; | |
196 | raw->queued_write = req; | |
197 | } else { | |
198 | raw->written -= req->len; | |
199 | } | |
200 | ||
201 | ccw = req->ccws; | |
202 | req->start = (raw->head - raw->count + raw->written) & | |
203 | (RAW3215_BUFFER_SIZE - 1); | |
204 | /* | |
205 | * now we have to count newlines. We can at max accept | |
206 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
207 | * a restriction in VM | |
208 | */ | |
209 | lines = 0; | |
210 | ix = req->start; | |
211 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
212 | if (raw->buffer[ix] == 0x15) | |
213 | lines++; | |
214 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
215 | } | |
216 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
217 | if (len > RAW3215_MAX_BYTES) | |
218 | len = RAW3215_MAX_BYTES; | |
219 | req->len = len; | |
220 | raw->written += len; | |
221 | ||
222 | /* set the indication if we should try to enlarge this request */ | |
223 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
224 | ||
225 | ix = req->start; | |
226 | while (len > 0) { | |
227 | if (ccw > req->ccws) | |
228 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
229 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
230 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
231 | ccw->cda = | |
232 | (__u32) __pa(raw->buffer + ix); | |
233 | count = len; | |
234 | if (ix + count > RAW3215_BUFFER_SIZE) | |
235 | count = RAW3215_BUFFER_SIZE - ix; | |
236 | ccw->count = count; | |
237 | len -= count; | |
238 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
239 | ccw++; | |
240 | } | |
241 | /* | |
242 | * Add a NOP to the channel program. 3215 devices are purely | |
243 | * emulated and its much better to avoid the channel end | |
244 | * interrupt in this case. | |
245 | */ | |
246 | if (ccw > req->ccws) | |
247 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
248 | ccw->cmd_code = 0x03; /* NOP */ | |
249 | ccw->flags = 0; | |
250 | ccw->cda = 0; | |
251 | ccw->count = 1; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Start a read or a write request | |
256 | */ | |
257 | static void | |
258 | raw3215_start_io(struct raw3215_info *raw) | |
259 | { | |
260 | struct raw3215_req *req; | |
261 | int res; | |
262 | ||
263 | req = raw->queued_read; | |
264 | if (req != NULL && | |
265 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
266 | /* dequeue request */ | |
267 | raw->queued_read = NULL; | |
268 | res = ccw_device_start(raw->cdev, req->ccws, | |
269 | (unsigned long) req, 0, 0); | |
270 | if (res != 0) { | |
271 | /* do_IO failed, put request back to queue */ | |
272 | raw->queued_read = req; | |
273 | } else { | |
274 | raw->flags |= RAW3215_WORKING; | |
275 | } | |
276 | } | |
277 | req = raw->queued_write; | |
278 | if (req != NULL && | |
279 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
280 | /* dequeue request */ | |
281 | raw->queued_write = NULL; | |
282 | res = ccw_device_start(raw->cdev, req->ccws, | |
283 | (unsigned long) req, 0, 0); | |
284 | if (res != 0) { | |
285 | /* do_IO failed, put request back to queue */ | |
286 | raw->queued_write = req; | |
287 | } else { | |
288 | raw->flags |= RAW3215_WORKING; | |
289 | } | |
290 | } | |
291 | } | |
292 | ||
293 | /* | |
294 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
295 | */ | |
296 | static void | |
297 | raw3215_timeout(unsigned long __data) | |
298 | { | |
299 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
300 | unsigned long flags; | |
301 | ||
302 | spin_lock_irqsave(raw->lock, flags); | |
303 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
304 | del_timer(&raw->timer); | |
305 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
306 | raw3215_mk_write_req(raw); | |
307 | raw3215_start_io(raw); | |
308 | } | |
309 | spin_unlock_irqrestore(raw->lock, flags); | |
310 | } | |
311 | ||
312 | /* | |
313 | * Function to conditionally start an IO. A read is started immediately, | |
314 | * a write is only started immediately if the flush flag is on or the | |
315 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
316 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
317 | */ | |
318 | static inline void | |
319 | raw3215_try_io(struct raw3215_info *raw) | |
320 | { | |
321 | if (!(raw->flags & RAW3215_ACTIVE)) | |
322 | return; | |
323 | if (raw->queued_read != NULL) | |
324 | raw3215_start_io(raw); | |
325 | else if (raw->queued_write != NULL) { | |
326 | if ((raw->queued_write->delayable == 0) || | |
327 | (raw->flags & RAW3215_FLUSHING)) { | |
328 | /* execute write requests bigger than minimum size */ | |
329 | raw3215_start_io(raw); | |
330 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
331 | del_timer(&raw->timer); | |
332 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
333 | } | |
334 | } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { | |
335 | /* delay small writes */ | |
336 | init_timer(&raw->timer); | |
337 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
338 | raw->timer.data = (unsigned long) raw; | |
339 | raw->timer.function = raw3215_timeout; | |
340 | add_timer(&raw->timer); | |
341 | raw->flags |= RAW3215_TIMER_RUNS; | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | /* | |
347 | * The bottom half handler routine for 3215 devices. It tries to start | |
348 | * the next IO and wakes up processes waiting on the tty. | |
349 | */ | |
350 | static void | |
351 | raw3215_tasklet(void *data) | |
352 | { | |
353 | struct raw3215_info *raw; | |
354 | struct tty_struct *tty; | |
355 | unsigned long flags; | |
356 | ||
357 | raw = (struct raw3215_info *) data; | |
358 | spin_lock_irqsave(raw->lock, flags); | |
359 | raw3215_mk_write_req(raw); | |
360 | raw3215_try_io(raw); | |
361 | spin_unlock_irqrestore(raw->lock, flags); | |
362 | /* Check for pending message from raw3215_irq */ | |
363 | if (raw->message != NULL) { | |
364 | printk(raw->message, raw->msg_dstat, raw->msg_cstat); | |
365 | raw->message = NULL; | |
366 | } | |
367 | tty = raw->tty; | |
368 | if (tty != NULL && | |
369 | RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { | |
370 | tty_wakeup(tty); | |
371 | } | |
372 | } | |
373 | ||
374 | /* | |
375 | * Interrupt routine, called from common io layer | |
376 | */ | |
377 | static void | |
378 | raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
379 | { | |
380 | struct raw3215_info *raw; | |
381 | struct raw3215_req *req; | |
382 | struct tty_struct *tty; | |
383 | int cstat, dstat; | |
384 | int count, slen; | |
385 | ||
386 | raw = cdev->dev.driver_data; | |
387 | req = (struct raw3215_req *) intparm; | |
388 | cstat = irb->scsw.cstat; | |
389 | dstat = irb->scsw.dstat; | |
390 | if (cstat != 0) { | |
391 | raw->message = KERN_WARNING | |
392 | "Got nonzero channel status in raw3215_irq " | |
393 | "(dev sts 0x%2x, sch sts 0x%2x)"; | |
394 | raw->msg_dstat = dstat; | |
395 | raw->msg_cstat = cstat; | |
396 | tasklet_schedule(&raw->tasklet); | |
397 | } | |
398 | if (dstat & 0x01) { /* we got a unit exception */ | |
399 | dstat &= ~0x01; /* we can ignore it */ | |
400 | } | |
401 | switch (dstat) { | |
402 | case 0x80: | |
403 | if (cstat != 0) | |
404 | break; | |
405 | /* Attention interrupt, someone hit the enter key */ | |
406 | raw3215_mk_read_req(raw); | |
407 | if (MACHINE_IS_P390) | |
408 | memset(raw->inbuf, 0, RAW3215_INBUF_SIZE); | |
409 | tasklet_schedule(&raw->tasklet); | |
410 | break; | |
411 | case 0x08: | |
412 | case 0x0C: | |
413 | /* Channel end interrupt. */ | |
414 | if ((raw = req->info) == NULL) | |
415 | return; /* That shouldn't happen ... */ | |
416 | if (req->type == RAW3215_READ) { | |
417 | /* store residual count, then wait for device end */ | |
418 | req->residual = irb->scsw.count; | |
419 | } | |
420 | if (dstat == 0x08) | |
421 | break; | |
422 | case 0x04: | |
423 | /* Device end interrupt. */ | |
424 | if ((raw = req->info) == NULL) | |
425 | return; /* That shouldn't happen ... */ | |
426 | if (req->type == RAW3215_READ && raw->tty != NULL) { | |
427 | unsigned int cchar; | |
428 | ||
429 | tty = raw->tty; | |
430 | count = 160 - req->residual; | |
431 | if (MACHINE_IS_P390) { | |
432 | slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE); | |
433 | if (count > slen) | |
434 | count = slen; | |
435 | } else | |
1da177e4 LT |
436 | EBCASC(raw->inbuf, count); |
437 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
438 | switch (cchar & CTRLCHAR_MASK) { | |
439 | case CTRLCHAR_SYSRQ: | |
440 | break; | |
441 | ||
442 | case CTRLCHAR_CTRL: | |
33f0f88f | 443 | tty_insert_flip_char(tty, cchar, TTY_NORMAL); |
1da177e4 LT |
444 | tty_flip_buffer_push(raw->tty); |
445 | break; | |
446 | ||
447 | case CTRLCHAR_NONE: | |
1da177e4 | 448 | if (count < 2 || |
33f0f88f AC |
449 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
450 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
451 | /* add the auto \n */ | |
452 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
453 | count++; |
454 | } else | |
33f0f88f AC |
455 | count -= 2; |
456 | tty_insert_flip_string(tty, raw->inbuf, count); | |
1da177e4 LT |
457 | tty_flip_buffer_push(raw->tty); |
458 | break; | |
459 | } | |
460 | } else if (req->type == RAW3215_WRITE) { | |
461 | raw->count -= req->len; | |
462 | raw->written -= req->len; | |
463 | } | |
464 | raw->flags &= ~RAW3215_WORKING; | |
465 | raw3215_free_req(req); | |
466 | /* check for empty wait */ | |
467 | if (waitqueue_active(&raw->empty_wait) && | |
468 | raw->queued_write == NULL && | |
469 | raw->queued_read == NULL) { | |
470 | wake_up_interruptible(&raw->empty_wait); | |
471 | } | |
472 | tasklet_schedule(&raw->tasklet); | |
473 | break; | |
474 | default: | |
475 | /* Strange interrupt, I'll do my best to clean up */ | |
476 | if (req != NULL && req->type != RAW3215_FREE) { | |
477 | if (req->type == RAW3215_WRITE) { | |
478 | raw->count -= req->len; | |
479 | raw->written -= req->len; | |
480 | } | |
481 | raw->flags &= ~RAW3215_WORKING; | |
482 | raw3215_free_req(req); | |
483 | } | |
484 | raw->message = KERN_WARNING | |
485 | "Spurious interrupt in in raw3215_irq " | |
486 | "(dev sts 0x%2x, sch sts 0x%2x)"; | |
487 | raw->msg_dstat = dstat; | |
488 | raw->msg_cstat = cstat; | |
489 | tasklet_schedule(&raw->tasklet); | |
490 | } | |
491 | return; | |
492 | } | |
493 | ||
494 | /* | |
495 | * Wait until length bytes are available int the output buffer. | |
496 | * Has to be called with the s390irq lock held. Can be called | |
497 | * disabled. | |
498 | */ | |
499 | static void | |
500 | raw3215_make_room(struct raw3215_info *raw, unsigned int length) | |
501 | { | |
502 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
503 | /* there might be a request pending */ | |
504 | raw->flags |= RAW3215_FLUSHING; | |
505 | raw3215_mk_write_req(raw); | |
506 | raw3215_try_io(raw); | |
507 | raw->flags &= ~RAW3215_FLUSHING; | |
508 | #ifdef CONFIG_TN3215_CONSOLE | |
509 | wait_cons_dev(); | |
510 | #endif | |
511 | /* Enough room freed up ? */ | |
512 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
513 | break; | |
514 | /* there might be another cpu waiting for the lock */ | |
515 | spin_unlock(raw->lock); | |
516 | udelay(100); | |
517 | spin_lock(raw->lock); | |
518 | } | |
519 | } | |
520 | ||
521 | /* | |
522 | * String write routine for 3215 devices | |
523 | */ | |
524 | static void | |
525 | raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) | |
526 | { | |
527 | unsigned long flags; | |
528 | int c, count; | |
529 | ||
530 | while (length > 0) { | |
531 | spin_lock_irqsave(raw->lock, flags); | |
532 | count = (length > RAW3215_BUFFER_SIZE) ? | |
533 | RAW3215_BUFFER_SIZE : length; | |
534 | length -= count; | |
535 | ||
536 | raw3215_make_room(raw, count); | |
537 | ||
538 | /* copy string to output buffer and convert it to EBCDIC */ | |
539 | while (1) { | |
540 | c = min_t(int, count, | |
541 | min(RAW3215_BUFFER_SIZE - raw->count, | |
542 | RAW3215_BUFFER_SIZE - raw->head)); | |
543 | if (c <= 0) | |
544 | break; | |
545 | memcpy(raw->buffer + raw->head, str, c); | |
546 | ASCEBC(raw->buffer + raw->head, c); | |
547 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
548 | raw->count += c; | |
549 | raw->line_pos += c; | |
550 | str += c; | |
551 | count -= c; | |
552 | } | |
553 | if (!(raw->flags & RAW3215_WORKING)) { | |
554 | raw3215_mk_write_req(raw); | |
555 | /* start or queue request */ | |
556 | raw3215_try_io(raw); | |
557 | } | |
558 | spin_unlock_irqrestore(raw->lock, flags); | |
559 | } | |
560 | } | |
561 | ||
562 | /* | |
563 | * Put character routine for 3215 devices | |
564 | */ | |
565 | static void | |
566 | raw3215_putchar(struct raw3215_info *raw, unsigned char ch) | |
567 | { | |
568 | unsigned long flags; | |
569 | unsigned int length, i; | |
570 | ||
571 | spin_lock_irqsave(raw->lock, flags); | |
572 | if (ch == '\t') { | |
573 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
574 | raw->line_pos += length; | |
575 | ch = ' '; | |
576 | } else if (ch == '\n') { | |
577 | length = 1; | |
578 | raw->line_pos = 0; | |
579 | } else { | |
580 | length = 1; | |
581 | raw->line_pos++; | |
582 | } | |
583 | raw3215_make_room(raw, length); | |
584 | ||
585 | for (i = 0; i < length; i++) { | |
586 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
587 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
588 | raw->count++; | |
589 | } | |
590 | if (!(raw->flags & RAW3215_WORKING)) { | |
591 | raw3215_mk_write_req(raw); | |
592 | /* start or queue request */ | |
593 | raw3215_try_io(raw); | |
594 | } | |
595 | spin_unlock_irqrestore(raw->lock, flags); | |
596 | } | |
597 | ||
598 | /* | |
599 | * Flush routine, it simply sets the flush flag and tries to start | |
600 | * pending IO. | |
601 | */ | |
602 | static void | |
603 | raw3215_flush_buffer(struct raw3215_info *raw) | |
604 | { | |
605 | unsigned long flags; | |
606 | ||
607 | spin_lock_irqsave(raw->lock, flags); | |
608 | if (raw->count > 0) { | |
609 | raw->flags |= RAW3215_FLUSHING; | |
610 | raw3215_try_io(raw); | |
611 | raw->flags &= ~RAW3215_FLUSHING; | |
612 | } | |
613 | spin_unlock_irqrestore(raw->lock, flags); | |
614 | } | |
615 | ||
616 | /* | |
617 | * Fire up a 3215 device. | |
618 | */ | |
619 | static int | |
620 | raw3215_startup(struct raw3215_info *raw) | |
621 | { | |
622 | unsigned long flags; | |
623 | ||
624 | if (raw->flags & RAW3215_ACTIVE) | |
625 | return 0; | |
626 | raw->line_pos = 0; | |
627 | raw->flags |= RAW3215_ACTIVE; | |
628 | spin_lock_irqsave(raw->lock, flags); | |
629 | raw3215_try_io(raw); | |
630 | spin_unlock_irqrestore(raw->lock, flags); | |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Shutdown a 3215 device. | |
637 | */ | |
638 | static void | |
639 | raw3215_shutdown(struct raw3215_info *raw) | |
640 | { | |
641 | DECLARE_WAITQUEUE(wait, current); | |
642 | unsigned long flags; | |
643 | ||
644 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) | |
645 | return; | |
646 | /* Wait for outstanding requests, then free irq */ | |
647 | spin_lock_irqsave(raw->lock, flags); | |
648 | if ((raw->flags & RAW3215_WORKING) || | |
649 | raw->queued_write != NULL || | |
650 | raw->queued_read != NULL) { | |
651 | raw->flags |= RAW3215_CLOSING; | |
652 | add_wait_queue(&raw->empty_wait, &wait); | |
653 | set_current_state(TASK_INTERRUPTIBLE); | |
654 | spin_unlock_irqrestore(raw->lock, flags); | |
655 | schedule(); | |
656 | spin_lock_irqsave(raw->lock, flags); | |
657 | remove_wait_queue(&raw->empty_wait, &wait); | |
658 | set_current_state(TASK_RUNNING); | |
659 | raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); | |
660 | } | |
661 | spin_unlock_irqrestore(raw->lock, flags); | |
662 | } | |
663 | ||
664 | static int | |
665 | raw3215_probe (struct ccw_device *cdev) | |
666 | { | |
667 | struct raw3215_info *raw; | |
668 | int line; | |
669 | ||
670 | raw = kmalloc(sizeof(struct raw3215_info) + | |
671 | RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); | |
672 | if (raw == NULL) | |
673 | return -ENOMEM; | |
674 | ||
675 | spin_lock(&raw3215_device_lock); | |
676 | for (line = 0; line < NR_3215; line++) { | |
677 | if (!raw3215[line]) { | |
678 | raw3215[line] = raw; | |
679 | break; | |
680 | } | |
681 | } | |
682 | spin_unlock(&raw3215_device_lock); | |
683 | if (line == NR_3215) { | |
684 | kfree(raw); | |
685 | return -ENODEV; | |
686 | } | |
687 | ||
688 | raw->cdev = cdev; | |
689 | raw->lock = get_ccwdev_lock(cdev); | |
690 | raw->inbuf = (char *) raw + sizeof(struct raw3215_info); | |
691 | memset(raw, 0, sizeof(struct raw3215_info)); | |
692 | raw->buffer = (char *) kmalloc(RAW3215_BUFFER_SIZE, | |
693 | GFP_KERNEL|GFP_DMA); | |
694 | if (raw->buffer == NULL) { | |
695 | spin_lock(&raw3215_device_lock); | |
696 | raw3215[line] = 0; | |
697 | spin_unlock(&raw3215_device_lock); | |
698 | kfree(raw); | |
699 | return -ENOMEM; | |
700 | } | |
701 | tasklet_init(&raw->tasklet, | |
702 | (void (*)(unsigned long)) raw3215_tasklet, | |
703 | (unsigned long) raw); | |
704 | init_waitqueue_head(&raw->empty_wait); | |
705 | ||
706 | cdev->dev.driver_data = raw; | |
707 | cdev->handler = raw3215_irq; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | static void | |
713 | raw3215_remove (struct ccw_device *cdev) | |
714 | { | |
715 | struct raw3215_info *raw; | |
716 | ||
717 | ccw_device_set_offline(cdev); | |
718 | raw = cdev->dev.driver_data; | |
719 | if (raw) { | |
720 | cdev->dev.driver_data = NULL; | |
17fd682e | 721 | kfree(raw->buffer); |
1da177e4 LT |
722 | kfree(raw); |
723 | } | |
724 | } | |
725 | ||
726 | static int | |
727 | raw3215_set_online (struct ccw_device *cdev) | |
728 | { | |
729 | struct raw3215_info *raw; | |
730 | ||
731 | raw = cdev->dev.driver_data; | |
732 | if (!raw) | |
733 | return -ENODEV; | |
734 | ||
735 | return raw3215_startup(raw); | |
736 | } | |
737 | ||
738 | static int | |
739 | raw3215_set_offline (struct ccw_device *cdev) | |
740 | { | |
741 | struct raw3215_info *raw; | |
742 | ||
743 | raw = cdev->dev.driver_data; | |
744 | if (!raw) | |
745 | return -ENODEV; | |
746 | ||
747 | raw3215_shutdown(raw); | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | static struct ccw_device_id raw3215_id[] = { | |
753 | { CCW_DEVICE(0x3215, 0) }, | |
754 | { /* end of list */ }, | |
755 | }; | |
756 | ||
757 | static struct ccw_driver raw3215_ccw_driver = { | |
758 | .name = "3215", | |
759 | .owner = THIS_MODULE, | |
760 | .ids = raw3215_id, | |
761 | .probe = &raw3215_probe, | |
762 | .remove = &raw3215_remove, | |
763 | .set_online = &raw3215_set_online, | |
764 | .set_offline = &raw3215_set_offline, | |
765 | }; | |
766 | ||
767 | #ifdef CONFIG_TN3215_CONSOLE | |
768 | /* | |
769 | * Write a string to the 3215 console | |
770 | */ | |
771 | static void | |
772 | con3215_write(struct console *co, const char *str, unsigned int count) | |
773 | { | |
774 | struct raw3215_info *raw; | |
775 | int i; | |
776 | ||
777 | if (count <= 0) | |
778 | return; | |
779 | raw = raw3215[0]; /* console 3215 is the first one */ | |
780 | while (count > 0) { | |
781 | for (i = 0; i < count; i++) | |
782 | if (str[i] == '\t' || str[i] == '\n') | |
783 | break; | |
784 | raw3215_write(raw, str, i); | |
785 | count -= i; | |
786 | str += i; | |
787 | if (count > 0) { | |
788 | raw3215_putchar(raw, *str); | |
789 | count--; | |
790 | str++; | |
791 | } | |
792 | } | |
793 | } | |
794 | ||
795 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
796 | { | |
797 | *index = c->index; | |
798 | return tty3215_driver; | |
799 | } | |
800 | ||
801 | /* | |
802 | * panic() calls console_unblank before the system enters a | |
803 | * disabled, endless loop. | |
804 | */ | |
805 | static void | |
806 | con3215_unblank(void) | |
807 | { | |
808 | struct raw3215_info *raw; | |
809 | unsigned long flags; | |
810 | ||
811 | raw = raw3215[0]; /* console 3215 is the first one */ | |
812 | spin_lock_irqsave(raw->lock, flags); | |
813 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
814 | spin_unlock_irqrestore(raw->lock, flags); | |
815 | } | |
816 | ||
817 | static int __init | |
818 | con3215_consetup(struct console *co, char *options) | |
819 | { | |
820 | return 0; | |
821 | } | |
822 | ||
823 | /* | |
824 | * The console structure for the 3215 console | |
825 | */ | |
826 | static struct console con3215 = { | |
827 | .name = "ttyS", | |
828 | .write = con3215_write, | |
829 | .device = con3215_device, | |
830 | .unblank = con3215_unblank, | |
831 | .setup = con3215_consetup, | |
832 | .flags = CON_PRINTBUFFER, | |
833 | }; | |
834 | ||
835 | /* | |
836 | * 3215 console initialization code called from console_init(). | |
837 | * NOTE: This is called before kmalloc is available. | |
838 | */ | |
839 | static int __init | |
840 | con3215_init(void) | |
841 | { | |
842 | struct ccw_device *cdev; | |
843 | struct raw3215_info *raw; | |
844 | struct raw3215_req *req; | |
845 | int i; | |
846 | ||
847 | /* Check if 3215 is to be the console */ | |
848 | if (!CONSOLE_IS_3215) | |
849 | return -ENODEV; | |
850 | ||
851 | /* Set the console mode for VM */ | |
852 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
853 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
854 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
855 | } |
856 | ||
857 | /* allocate 3215 request structures */ | |
858 | raw3215_freelist = NULL; | |
859 | spin_lock_init(&raw3215_freelist_lock); | |
860 | for (i = 0; i < NR_3215_REQ; i++) { | |
861 | req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); | |
862 | req->next = raw3215_freelist; | |
863 | raw3215_freelist = req; | |
864 | } | |
865 | ||
866 | cdev = ccw_device_probe_console(); | |
867 | if (!cdev) | |
868 | return -ENODEV; | |
869 | ||
870 | raw3215[0] = raw = (struct raw3215_info *) | |
871 | alloc_bootmem_low(sizeof(struct raw3215_info)); | |
872 | memset(raw, 0, sizeof(struct raw3215_info)); | |
873 | raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); | |
874 | raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); | |
875 | raw->cdev = cdev; | |
876 | raw->lock = get_ccwdev_lock(cdev); | |
877 | cdev->dev.driver_data = raw; | |
878 | cdev->handler = raw3215_irq; | |
879 | ||
880 | raw->flags |= RAW3215_FIXED; | |
881 | tasklet_init(&raw->tasklet, | |
882 | (void (*)(unsigned long)) raw3215_tasklet, | |
883 | (unsigned long) raw); | |
884 | init_waitqueue_head(&raw->empty_wait); | |
885 | ||
886 | /* Request the console irq */ | |
887 | if (raw3215_startup(raw) != 0) { | |
888 | free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); | |
889 | free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); | |
890 | free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); | |
891 | raw3215[0] = NULL; | |
892 | printk("Couldn't find a 3215 console device\n"); | |
893 | return -ENODEV; | |
894 | } | |
895 | register_console(&con3215); | |
896 | return 0; | |
897 | } | |
898 | console_initcall(con3215_init); | |
899 | #endif | |
900 | ||
901 | /* | |
902 | * tty3215_open | |
903 | * | |
904 | * This routine is called whenever a 3215 tty is opened. | |
905 | */ | |
906 | static int | |
907 | tty3215_open(struct tty_struct *tty, struct file * filp) | |
908 | { | |
909 | struct raw3215_info *raw; | |
910 | int retval, line; | |
911 | ||
912 | line = tty->index; | |
913 | if ((line < 0) || (line >= NR_3215)) | |
914 | return -ENODEV; | |
915 | ||
916 | raw = raw3215[line]; | |
917 | if (raw == NULL) | |
918 | return -ENODEV; | |
919 | ||
920 | tty->driver_data = raw; | |
921 | raw->tty = tty; | |
922 | ||
923 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
924 | /* | |
925 | * Start up 3215 device | |
926 | */ | |
927 | retval = raw3215_startup(raw); | |
928 | if (retval) | |
929 | return retval; | |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
934 | /* | |
935 | * tty3215_close() | |
936 | * | |
937 | * This routine is called when the 3215 tty is closed. We wait | |
938 | * for the remaining request to be completed. Then we clean up. | |
939 | */ | |
940 | static void | |
941 | tty3215_close(struct tty_struct *tty, struct file * filp) | |
942 | { | |
943 | struct raw3215_info *raw; | |
944 | ||
945 | raw = (struct raw3215_info *) tty->driver_data; | |
946 | if (raw == NULL || tty->count > 1) | |
947 | return; | |
948 | tty->closing = 1; | |
949 | /* Shutdown the terminal */ | |
950 | raw3215_shutdown(raw); | |
951 | tty->closing = 0; | |
952 | raw->tty = NULL; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Returns the amount of free space in the output buffer. | |
957 | */ | |
958 | static int | |
959 | tty3215_write_room(struct tty_struct *tty) | |
960 | { | |
961 | struct raw3215_info *raw; | |
962 | ||
963 | raw = (struct raw3215_info *) tty->driver_data; | |
964 | ||
965 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
966 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
967 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
968 | else | |
969 | return 0; | |
970 | } | |
971 | ||
972 | /* | |
973 | * String write routine for 3215 ttys | |
974 | */ | |
975 | static int | |
976 | tty3215_write(struct tty_struct * tty, | |
977 | const unsigned char *buf, int count) | |
978 | { | |
979 | struct raw3215_info *raw; | |
980 | ||
981 | if (!tty) | |
982 | return 0; | |
983 | raw = (struct raw3215_info *) tty->driver_data; | |
984 | raw3215_write(raw, buf, count); | |
985 | return count; | |
986 | } | |
987 | ||
988 | /* | |
989 | * Put character routine for 3215 ttys | |
990 | */ | |
991 | static void | |
992 | tty3215_put_char(struct tty_struct *tty, unsigned char ch) | |
993 | { | |
994 | struct raw3215_info *raw; | |
995 | ||
996 | if (!tty) | |
997 | return; | |
998 | raw = (struct raw3215_info *) tty->driver_data; | |
999 | raw3215_putchar(raw, ch); | |
1000 | } | |
1001 | ||
1002 | static void | |
1003 | tty3215_flush_chars(struct tty_struct *tty) | |
1004 | { | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * Returns the number of characters in the output buffer | |
1009 | */ | |
1010 | static int | |
1011 | tty3215_chars_in_buffer(struct tty_struct *tty) | |
1012 | { | |
1013 | struct raw3215_info *raw; | |
1014 | ||
1015 | raw = (struct raw3215_info *) tty->driver_data; | |
1016 | return raw->count; | |
1017 | } | |
1018 | ||
1019 | static void | |
1020 | tty3215_flush_buffer(struct tty_struct *tty) | |
1021 | { | |
1022 | struct raw3215_info *raw; | |
1023 | ||
1024 | raw = (struct raw3215_info *) tty->driver_data; | |
1025 | raw3215_flush_buffer(raw); | |
1026 | tty_wakeup(tty); | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Currently we don't have any io controls for 3215 ttys | |
1031 | */ | |
1032 | static int | |
1033 | tty3215_ioctl(struct tty_struct *tty, struct file * file, | |
1034 | unsigned int cmd, unsigned long arg) | |
1035 | { | |
1036 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1037 | return -EIO; | |
1038 | ||
1039 | switch (cmd) { | |
1040 | default: | |
1041 | return -ENOIOCTLCMD; | |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Disable reading from a 3215 tty | |
1048 | */ | |
1049 | static void | |
1050 | tty3215_throttle(struct tty_struct * tty) | |
1051 | { | |
1052 | struct raw3215_info *raw; | |
1053 | ||
1054 | raw = (struct raw3215_info *) tty->driver_data; | |
1055 | raw->flags |= RAW3215_THROTTLED; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Enable reading from a 3215 tty | |
1060 | */ | |
1061 | static void | |
1062 | tty3215_unthrottle(struct tty_struct * tty) | |
1063 | { | |
1064 | struct raw3215_info *raw; | |
1065 | unsigned long flags; | |
1066 | ||
1067 | raw = (struct raw3215_info *) tty->driver_data; | |
1068 | if (raw->flags & RAW3215_THROTTLED) { | |
1069 | spin_lock_irqsave(raw->lock, flags); | |
1070 | raw->flags &= ~RAW3215_THROTTLED; | |
1071 | raw3215_try_io(raw); | |
1072 | spin_unlock_irqrestore(raw->lock, flags); | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Disable writing to a 3215 tty | |
1078 | */ | |
1079 | static void | |
1080 | tty3215_stop(struct tty_struct *tty) | |
1081 | { | |
1082 | struct raw3215_info *raw; | |
1083 | ||
1084 | raw = (struct raw3215_info *) tty->driver_data; | |
1085 | raw->flags |= RAW3215_STOPPED; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Enable writing to a 3215 tty | |
1090 | */ | |
1091 | static void | |
1092 | tty3215_start(struct tty_struct *tty) | |
1093 | { | |
1094 | struct raw3215_info *raw; | |
1095 | unsigned long flags; | |
1096 | ||
1097 | raw = (struct raw3215_info *) tty->driver_data; | |
1098 | if (raw->flags & RAW3215_STOPPED) { | |
1099 | spin_lock_irqsave(raw->lock, flags); | |
1100 | raw->flags &= ~RAW3215_STOPPED; | |
1101 | raw3215_try_io(raw); | |
1102 | spin_unlock_irqrestore(raw->lock, flags); | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | static struct tty_operations tty3215_ops = { | |
1107 | .open = tty3215_open, | |
1108 | .close = tty3215_close, | |
1109 | .write = tty3215_write, | |
1110 | .put_char = tty3215_put_char, | |
1111 | .flush_chars = tty3215_flush_chars, | |
1112 | .write_room = tty3215_write_room, | |
1113 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1114 | .flush_buffer = tty3215_flush_buffer, | |
1115 | .ioctl = tty3215_ioctl, | |
1116 | .throttle = tty3215_throttle, | |
1117 | .unthrottle = tty3215_unthrottle, | |
1118 | .stop = tty3215_stop, | |
1119 | .start = tty3215_start, | |
1120 | }; | |
1121 | ||
1122 | /* | |
1123 | * 3215 tty registration code called from tty_init(). | |
1124 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1125 | */ | |
1126 | int __init | |
1127 | tty3215_init(void) | |
1128 | { | |
1129 | struct tty_driver *driver; | |
1130 | int ret; | |
1131 | ||
1132 | if (!CONSOLE_IS_3215) | |
1133 | return 0; | |
1134 | ||
1135 | driver = alloc_tty_driver(NR_3215); | |
1136 | if (!driver) | |
1137 | return -ENOMEM; | |
1138 | ||
1139 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1140 | if (ret) { | |
1141 | put_tty_driver(driver); | |
1142 | return ret; | |
1143 | } | |
1144 | /* | |
1145 | * Initialize the tty_driver structure | |
1146 | * Entries in tty3215_driver that are NOT initialized: | |
1147 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1148 | */ | |
1149 | ||
1150 | driver->owner = THIS_MODULE; | |
1151 | driver->driver_name = "tty3215"; | |
1152 | driver->name = "ttyS"; | |
1153 | driver->major = TTY_MAJOR; | |
1154 | driver->minor_start = 64; | |
1155 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1156 | driver->subtype = SYSTEM_TYPE_TTY; | |
1157 | driver->init_termios = tty_std_termios; | |
1158 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1159 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1160 | driver->init_termios.c_lflag = ISIG; | |
1161 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1162 | tty_set_operations(driver, &tty3215_ops); | |
1163 | ret = tty_register_driver(driver); | |
1164 | if (ret) { | |
1165 | printk("Couldn't register tty3215 driver\n"); | |
1166 | put_tty_driver(driver); | |
1167 | return ret; | |
1168 | } | |
1169 | tty3215_driver = driver; | |
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | static void __exit | |
1174 | tty3215_exit(void) | |
1175 | { | |
1176 | tty_unregister_driver(tty3215_driver); | |
1177 | put_tty_driver(tty3215_driver); | |
1178 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1179 | } | |
1180 | ||
1181 | module_init(tty3215_init); | |
1182 | module_exit(tty3215_exit); |