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Commit | Line | Data |
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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 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | #include <asm/ccwdev.h> |
25 | #include <asm/cio.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/ebcdic.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/delay.h> | |
30 | #include <asm/cpcmd.h> | |
31 | #include <asm/setup.h> | |
32 | ||
33 | #include "ctrlchar.h" | |
34 | ||
35 | #define NR_3215 1 | |
36 | #define NR_3215_REQ (4*NR_3215) | |
37 | #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ | |
38 | #define RAW3215_INBUF_SIZE 256 /* input buffer size */ | |
39 | #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ | |
40 | #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ | |
41 | #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ | |
42 | #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ | |
43 | #define RAW3215_NR_CCWS 3 | |
44 | #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ | |
45 | ||
46 | #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ | |
47 | #define RAW3215_ACTIVE 2 /* set if the device is in use */ | |
48 | #define RAW3215_WORKING 4 /* set if a request is being worked on */ | |
49 | #define RAW3215_THROTTLED 8 /* set if reading is disabled */ | |
50 | #define RAW3215_STOPPED 16 /* set if writing is disabled */ | |
51 | #define RAW3215_CLOSING 32 /* set while in close process */ | |
52 | #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ | |
53 | #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ | |
77812a27 | 54 | #define RAW3215_FROZEN 256 /* set if 3215 is frozen for suspend */ |
1da177e4 LT |
55 | |
56 | #define TAB_STOP_SIZE 8 /* tab stop size */ | |
57 | ||
58 | /* | |
59 | * Request types for a 3215 device | |
60 | */ | |
61 | enum raw3215_type { | |
62 | RAW3215_FREE, RAW3215_READ, RAW3215_WRITE | |
63 | }; | |
64 | ||
65 | /* | |
66 | * Request structure for a 3215 device | |
67 | */ | |
68 | struct raw3215_req { | |
69 | enum raw3215_type type; /* type of the request */ | |
70 | int start, len; /* start index & len in output buffer */ | |
71 | int delayable; /* indication to wait for more data */ | |
72 | int residual; /* residual count for read request */ | |
73 | struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ | |
74 | struct raw3215_info *info; /* pointer to main structure */ | |
75 | struct raw3215_req *next; /* pointer to next request */ | |
76 | } __attribute__ ((aligned(8))); | |
77 | ||
78 | struct raw3215_info { | |
79 | struct ccw_device *cdev; /* device for tty driver */ | |
80 | spinlock_t *lock; /* pointer to irq lock */ | |
81 | int flags; /* state flags */ | |
82 | char *buffer; /* pointer to output buffer */ | |
83 | char *inbuf; /* pointer to input buffer */ | |
84 | int head; /* first free byte in output buffer */ | |
85 | int count; /* number of bytes in output buffer */ | |
86 | int written; /* number of bytes in write requests */ | |
87 | struct tty_struct *tty; /* pointer to tty structure if present */ | |
1da177e4 LT |
88 | struct raw3215_req *queued_read; /* pointer to queued read requests */ |
89 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
90 | wait_queue_head_t empty_wait; /* wait queue for flushing */ | |
91 | struct timer_list timer; /* timer for delayed output */ | |
1da177e4 LT |
92 | int line_pos; /* position on the line (for tabs) */ |
93 | char ubuffer[80]; /* copy_from_user buffer */ | |
94 | }; | |
95 | ||
96 | /* array of 3215 devices structures */ | |
97 | static struct raw3215_info *raw3215[NR_3215]; | |
98 | /* spinlock to protect the raw3215 array */ | |
99 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
100 | /* list of free request structures */ | |
101 | static struct raw3215_req *raw3215_freelist; | |
102 | /* spinlock to protect free list */ | |
103 | static spinlock_t raw3215_freelist_lock; | |
104 | ||
105 | static struct tty_driver *tty3215_driver; | |
106 | ||
107 | /* | |
108 | * Get a request structure from the free list | |
109 | */ | |
77812a27 MS |
110 | static inline struct raw3215_req *raw3215_alloc_req(void) |
111 | { | |
1da177e4 LT |
112 | struct raw3215_req *req; |
113 | unsigned long flags; | |
114 | ||
115 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
116 | req = raw3215_freelist; | |
117 | raw3215_freelist = req->next; | |
118 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
119 | return req; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Put a request structure back to the free list | |
124 | */ | |
77812a27 MS |
125 | static inline void raw3215_free_req(struct raw3215_req *req) |
126 | { | |
1da177e4 LT |
127 | unsigned long flags; |
128 | ||
129 | if (req->type == RAW3215_FREE) | |
130 | return; /* don't free a free request */ | |
131 | req->type = RAW3215_FREE; | |
132 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
133 | req->next = raw3215_freelist; | |
134 | raw3215_freelist = req; | |
135 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
136 | } | |
137 | ||
138 | /* | |
139 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
140 | * If there is a queued read request it is used, but that shouldn't happen | |
141 | * because a 3215 terminal won't accept a new read before the old one is | |
142 | * completed. | |
143 | */ | |
77812a27 | 144 | static void raw3215_mk_read_req(struct raw3215_info *raw) |
1da177e4 LT |
145 | { |
146 | struct raw3215_req *req; | |
147 | struct ccw1 *ccw; | |
148 | ||
149 | /* there can only be ONE read request at a time */ | |
150 | req = raw->queued_read; | |
151 | if (req == NULL) { | |
152 | /* no queued read request, use new req structure */ | |
153 | req = raw3215_alloc_req(); | |
154 | req->type = RAW3215_READ; | |
155 | req->info = raw; | |
156 | raw->queued_read = req; | |
157 | } | |
158 | ||
159 | ccw = req->ccws; | |
160 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
161 | ccw->flags = 0x20; /* ignore incorrect length */ | |
162 | ccw->count = 160; | |
163 | ccw->cda = (__u32) __pa(raw->inbuf); | |
164 | } | |
165 | ||
166 | /* | |
167 | * Set up a write request with the information from the main structure. | |
168 | * A ccw chain is created that writes as much as possible from the output | |
169 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
170 | * the new, probably lengthened request. | |
171 | */ | |
77812a27 | 172 | static void raw3215_mk_write_req(struct raw3215_info *raw) |
1da177e4 LT |
173 | { |
174 | struct raw3215_req *req; | |
175 | struct ccw1 *ccw; | |
176 | int len, count, ix, lines; | |
177 | ||
178 | if (raw->count <= raw->written) | |
179 | return; | |
180 | /* check if there is a queued write request */ | |
181 | req = raw->queued_write; | |
182 | if (req == NULL) { | |
183 | /* no queued write request, use new req structure */ | |
184 | req = raw3215_alloc_req(); | |
185 | req->type = RAW3215_WRITE; | |
186 | req->info = raw; | |
187 | raw->queued_write = req; | |
188 | } else { | |
189 | raw->written -= req->len; | |
190 | } | |
191 | ||
192 | ccw = req->ccws; | |
193 | req->start = (raw->head - raw->count + raw->written) & | |
194 | (RAW3215_BUFFER_SIZE - 1); | |
195 | /* | |
196 | * now we have to count newlines. We can at max accept | |
197 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
198 | * a restriction in VM | |
199 | */ | |
200 | lines = 0; | |
201 | ix = req->start; | |
202 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
203 | if (raw->buffer[ix] == 0x15) | |
204 | lines++; | |
205 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
206 | } | |
207 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
208 | if (len > RAW3215_MAX_BYTES) | |
209 | len = RAW3215_MAX_BYTES; | |
210 | req->len = len; | |
211 | raw->written += len; | |
212 | ||
213 | /* set the indication if we should try to enlarge this request */ | |
214 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
215 | ||
216 | ix = req->start; | |
217 | while (len > 0) { | |
218 | if (ccw > req->ccws) | |
219 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
220 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
221 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
222 | ccw->cda = | |
223 | (__u32) __pa(raw->buffer + ix); | |
224 | count = len; | |
225 | if (ix + count > RAW3215_BUFFER_SIZE) | |
226 | count = RAW3215_BUFFER_SIZE - ix; | |
227 | ccw->count = count; | |
228 | len -= count; | |
229 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
230 | ccw++; | |
231 | } | |
232 | /* | |
233 | * Add a NOP to the channel program. 3215 devices are purely | |
234 | * emulated and its much better to avoid the channel end | |
235 | * interrupt in this case. | |
236 | */ | |
237 | if (ccw > req->ccws) | |
238 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
239 | ccw->cmd_code = 0x03; /* NOP */ | |
240 | ccw->flags = 0; | |
241 | ccw->cda = 0; | |
242 | ccw->count = 1; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Start a read or a write request | |
247 | */ | |
77812a27 | 248 | static void raw3215_start_io(struct raw3215_info *raw) |
1da177e4 LT |
249 | { |
250 | struct raw3215_req *req; | |
251 | int res; | |
252 | ||
253 | req = raw->queued_read; | |
254 | if (req != NULL && | |
255 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
256 | /* dequeue request */ | |
257 | raw->queued_read = NULL; | |
258 | res = ccw_device_start(raw->cdev, req->ccws, | |
259 | (unsigned long) req, 0, 0); | |
260 | if (res != 0) { | |
261 | /* do_IO failed, put request back to queue */ | |
262 | raw->queued_read = req; | |
263 | } else { | |
264 | raw->flags |= RAW3215_WORKING; | |
265 | } | |
266 | } | |
267 | req = raw->queued_write; | |
268 | if (req != NULL && | |
269 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
270 | /* dequeue request */ | |
271 | raw->queued_write = NULL; | |
272 | res = ccw_device_start(raw->cdev, req->ccws, | |
273 | (unsigned long) req, 0, 0); | |
274 | if (res != 0) { | |
275 | /* do_IO failed, put request back to queue */ | |
276 | raw->queued_write = req; | |
277 | } else { | |
278 | raw->flags |= RAW3215_WORKING; | |
279 | } | |
280 | } | |
281 | } | |
282 | ||
283 | /* | |
284 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
285 | */ | |
77812a27 | 286 | static void raw3215_timeout(unsigned long __data) |
1da177e4 LT |
287 | { |
288 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
289 | unsigned long flags; | |
290 | ||
520a4e37 | 291 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
292 | if (raw->flags & RAW3215_TIMER_RUNS) { |
293 | del_timer(&raw->timer); | |
294 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
77812a27 MS |
295 | if (!(raw->flags & RAW3215_FROZEN)) { |
296 | raw3215_mk_write_req(raw); | |
297 | raw3215_start_io(raw); | |
298 | } | |
1da177e4 | 299 | } |
520a4e37 | 300 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
301 | } |
302 | ||
303 | /* | |
304 | * Function to conditionally start an IO. A read is started immediately, | |
305 | * a write is only started immediately if the flush flag is on or the | |
306 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
307 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
308 | */ | |
77812a27 | 309 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 310 | { |
77812a27 | 311 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FROZEN)) |
1da177e4 LT |
312 | return; |
313 | if (raw->queued_read != NULL) | |
314 | raw3215_start_io(raw); | |
315 | else if (raw->queued_write != NULL) { | |
316 | if ((raw->queued_write->delayable == 0) || | |
317 | (raw->flags & RAW3215_FLUSHING)) { | |
318 | /* execute write requests bigger than minimum size */ | |
319 | raw3215_start_io(raw); | |
320 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
321 | del_timer(&raw->timer); | |
322 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
323 | } | |
324 | } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { | |
325 | /* delay small writes */ | |
326 | init_timer(&raw->timer); | |
327 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
328 | raw->timer.data = (unsigned long) raw; | |
329 | raw->timer.function = raw3215_timeout; | |
330 | add_timer(&raw->timer); | |
331 | raw->flags |= RAW3215_TIMER_RUNS; | |
332 | } | |
333 | } | |
334 | } | |
335 | ||
336 | /* | |
408aec3c | 337 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 338 | */ |
408aec3c | 339 | static void raw3215_next_io(struct raw3215_info *raw) |
1da177e4 | 340 | { |
1da177e4 | 341 | struct tty_struct *tty; |
1da177e4 | 342 | |
1da177e4 LT |
343 | raw3215_mk_write_req(raw); |
344 | raw3215_try_io(raw); | |
1da177e4 LT |
345 | tty = raw->tty; |
346 | if (tty != NULL && | |
347 | RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { | |
348 | tty_wakeup(tty); | |
349 | } | |
350 | } | |
351 | ||
352 | /* | |
353 | * Interrupt routine, called from common io layer | |
354 | */ | |
77812a27 MS |
355 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
356 | struct irb *irb) | |
1da177e4 LT |
357 | { |
358 | struct raw3215_info *raw; | |
359 | struct raw3215_req *req; | |
360 | struct tty_struct *tty; | |
361 | int cstat, dstat; | |
1d030370 | 362 | int count; |
1da177e4 | 363 | |
dff59b64 | 364 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 365 | req = (struct raw3215_req *) intparm; |
23d805b6 PO |
366 | cstat = irb->scsw.cmd.cstat; |
367 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 368 | if (cstat != 0) |
408aec3c | 369 | raw3215_next_io(raw); |
1da177e4 LT |
370 | if (dstat & 0x01) { /* we got a unit exception */ |
371 | dstat &= ~0x01; /* we can ignore it */ | |
372 | } | |
373 | switch (dstat) { | |
374 | case 0x80: | |
375 | if (cstat != 0) | |
376 | break; | |
377 | /* Attention interrupt, someone hit the enter key */ | |
378 | raw3215_mk_read_req(raw); | |
408aec3c | 379 | raw3215_next_io(raw); |
1da177e4 LT |
380 | break; |
381 | case 0x08: | |
382 | case 0x0C: | |
383 | /* Channel end interrupt. */ | |
384 | if ((raw = req->info) == NULL) | |
385 | return; /* That shouldn't happen ... */ | |
386 | if (req->type == RAW3215_READ) { | |
387 | /* store residual count, then wait for device end */ | |
23d805b6 | 388 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
389 | } |
390 | if (dstat == 0x08) | |
391 | break; | |
392 | case 0x04: | |
393 | /* Device end interrupt. */ | |
394 | if ((raw = req->info) == NULL) | |
395 | return; /* That shouldn't happen ... */ | |
396 | if (req->type == RAW3215_READ && raw->tty != NULL) { | |
397 | unsigned int cchar; | |
398 | ||
399 | tty = raw->tty; | |
400 | count = 160 - req->residual; | |
1da177e4 LT |
401 | EBCASC(raw->inbuf, count); |
402 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
403 | switch (cchar & CTRLCHAR_MASK) { | |
404 | case CTRLCHAR_SYSRQ: | |
405 | break; | |
406 | ||
407 | case CTRLCHAR_CTRL: | |
33f0f88f | 408 | tty_insert_flip_char(tty, cchar, TTY_NORMAL); |
1da177e4 LT |
409 | tty_flip_buffer_push(raw->tty); |
410 | break; | |
411 | ||
412 | case CTRLCHAR_NONE: | |
1da177e4 | 413 | if (count < 2 || |
33f0f88f AC |
414 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
415 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
416 | /* add the auto \n */ | |
417 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
418 | count++; |
419 | } else | |
33f0f88f AC |
420 | count -= 2; |
421 | tty_insert_flip_string(tty, raw->inbuf, count); | |
1da177e4 LT |
422 | tty_flip_buffer_push(raw->tty); |
423 | break; | |
424 | } | |
425 | } else if (req->type == RAW3215_WRITE) { | |
426 | raw->count -= req->len; | |
427 | raw->written -= req->len; | |
428 | } | |
429 | raw->flags &= ~RAW3215_WORKING; | |
430 | raw3215_free_req(req); | |
431 | /* check for empty wait */ | |
432 | if (waitqueue_active(&raw->empty_wait) && | |
433 | raw->queued_write == NULL && | |
434 | raw->queued_read == NULL) { | |
435 | wake_up_interruptible(&raw->empty_wait); | |
436 | } | |
408aec3c | 437 | raw3215_next_io(raw); |
1da177e4 LT |
438 | break; |
439 | default: | |
440 | /* Strange interrupt, I'll do my best to clean up */ | |
441 | if (req != NULL && req->type != RAW3215_FREE) { | |
442 | if (req->type == RAW3215_WRITE) { | |
443 | raw->count -= req->len; | |
444 | raw->written -= req->len; | |
445 | } | |
446 | raw->flags &= ~RAW3215_WORKING; | |
447 | raw3215_free_req(req); | |
448 | } | |
408aec3c | 449 | raw3215_next_io(raw); |
1da177e4 LT |
450 | } |
451 | return; | |
452 | } | |
453 | ||
77812a27 MS |
454 | /* |
455 | * Drop the oldest line from the output buffer. | |
456 | */ | |
457 | static void raw3215_drop_line(struct raw3215_info *raw) | |
458 | { | |
459 | int ix; | |
460 | char ch; | |
461 | ||
462 | BUG_ON(raw->written != 0); | |
463 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
464 | while (raw->count > 0) { | |
465 | ch = raw->buffer[ix]; | |
466 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
467 | raw->count--; | |
468 | if (ch == 0x15) | |
469 | break; | |
470 | } | |
471 | raw->head = ix; | |
472 | } | |
473 | ||
1da177e4 LT |
474 | /* |
475 | * Wait until length bytes are available int the output buffer. | |
476 | * Has to be called with the s390irq lock held. Can be called | |
477 | * disabled. | |
478 | */ | |
77812a27 | 479 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
480 | { |
481 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
482 | /* While console is frozen for suspend we have no other |
483 | * choice but to drop message from the buffer to make | |
484 | * room for even more messages. */ | |
485 | if (raw->flags & RAW3215_FROZEN) { | |
486 | raw3215_drop_line(raw); | |
487 | continue; | |
488 | } | |
1da177e4 LT |
489 | /* there might be a request pending */ |
490 | raw->flags |= RAW3215_FLUSHING; | |
491 | raw3215_mk_write_req(raw); | |
492 | raw3215_try_io(raw); | |
493 | raw->flags &= ~RAW3215_FLUSHING; | |
494 | #ifdef CONFIG_TN3215_CONSOLE | |
495 | wait_cons_dev(); | |
496 | #endif | |
497 | /* Enough room freed up ? */ | |
498 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
499 | break; | |
500 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 501 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 502 | udelay(100); |
520a4e37 | 503 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
504 | } |
505 | } | |
506 | ||
507 | /* | |
508 | * String write routine for 3215 devices | |
509 | */ | |
77812a27 MS |
510 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
511 | unsigned int length) | |
1da177e4 LT |
512 | { |
513 | unsigned long flags; | |
514 | int c, count; | |
515 | ||
516 | while (length > 0) { | |
520a4e37 | 517 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
518 | count = (length > RAW3215_BUFFER_SIZE) ? |
519 | RAW3215_BUFFER_SIZE : length; | |
520 | length -= count; | |
521 | ||
522 | raw3215_make_room(raw, count); | |
523 | ||
524 | /* copy string to output buffer and convert it to EBCDIC */ | |
525 | while (1) { | |
526 | c = min_t(int, count, | |
527 | min(RAW3215_BUFFER_SIZE - raw->count, | |
528 | RAW3215_BUFFER_SIZE - raw->head)); | |
529 | if (c <= 0) | |
530 | break; | |
531 | memcpy(raw->buffer + raw->head, str, c); | |
532 | ASCEBC(raw->buffer + raw->head, c); | |
533 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
534 | raw->count += c; | |
535 | raw->line_pos += c; | |
536 | str += c; | |
537 | count -= c; | |
538 | } | |
539 | if (!(raw->flags & RAW3215_WORKING)) { | |
540 | raw3215_mk_write_req(raw); | |
541 | /* start or queue request */ | |
542 | raw3215_try_io(raw); | |
543 | } | |
520a4e37 | 544 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
545 | } |
546 | } | |
547 | ||
548 | /* | |
549 | * Put character routine for 3215 devices | |
550 | */ | |
77812a27 | 551 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
552 | { |
553 | unsigned long flags; | |
554 | unsigned int length, i; | |
555 | ||
520a4e37 | 556 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
557 | if (ch == '\t') { |
558 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
559 | raw->line_pos += length; | |
560 | ch = ' '; | |
561 | } else if (ch == '\n') { | |
562 | length = 1; | |
563 | raw->line_pos = 0; | |
564 | } else { | |
565 | length = 1; | |
566 | raw->line_pos++; | |
567 | } | |
568 | raw3215_make_room(raw, length); | |
569 | ||
570 | for (i = 0; i < length; i++) { | |
571 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
572 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
573 | raw->count++; | |
574 | } | |
575 | if (!(raw->flags & RAW3215_WORKING)) { | |
576 | raw3215_mk_write_req(raw); | |
577 | /* start or queue request */ | |
578 | raw3215_try_io(raw); | |
579 | } | |
520a4e37 | 580 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
581 | } |
582 | ||
583 | /* | |
584 | * Flush routine, it simply sets the flush flag and tries to start | |
585 | * pending IO. | |
586 | */ | |
77812a27 | 587 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
588 | { |
589 | unsigned long flags; | |
590 | ||
520a4e37 | 591 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
592 | if (raw->count > 0) { |
593 | raw->flags |= RAW3215_FLUSHING; | |
594 | raw3215_try_io(raw); | |
595 | raw->flags &= ~RAW3215_FLUSHING; | |
596 | } | |
520a4e37 | 597 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
598 | } |
599 | ||
600 | /* | |
601 | * Fire up a 3215 device. | |
602 | */ | |
77812a27 | 603 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
604 | { |
605 | unsigned long flags; | |
606 | ||
607 | if (raw->flags & RAW3215_ACTIVE) | |
608 | return 0; | |
609 | raw->line_pos = 0; | |
610 | raw->flags |= RAW3215_ACTIVE; | |
520a4e37 | 611 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 612 | raw3215_try_io(raw); |
520a4e37 | 613 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
614 | |
615 | return 0; | |
616 | } | |
617 | ||
618 | /* | |
619 | * Shutdown a 3215 device. | |
620 | */ | |
77812a27 | 621 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
622 | { |
623 | DECLARE_WAITQUEUE(wait, current); | |
624 | unsigned long flags; | |
625 | ||
626 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) | |
627 | return; | |
628 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 629 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
630 | if ((raw->flags & RAW3215_WORKING) || |
631 | raw->queued_write != NULL || | |
632 | raw->queued_read != NULL) { | |
633 | raw->flags |= RAW3215_CLOSING; | |
634 | add_wait_queue(&raw->empty_wait, &wait); | |
635 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 636 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 637 | schedule(); |
520a4e37 | 638 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
639 | remove_wait_queue(&raw->empty_wait, &wait); |
640 | set_current_state(TASK_RUNNING); | |
641 | raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); | |
642 | } | |
520a4e37 | 643 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
644 | } |
645 | ||
77812a27 | 646 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
647 | { |
648 | struct raw3215_info *raw; | |
649 | int line; | |
650 | ||
a2e53801 | 651 | /* Console is special. */ |
dff59b64 | 652 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 653 | return 0; |
1da177e4 LT |
654 | raw = kmalloc(sizeof(struct raw3215_info) + |
655 | RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); | |
656 | if (raw == NULL) | |
657 | return -ENOMEM; | |
658 | ||
659 | spin_lock(&raw3215_device_lock); | |
660 | for (line = 0; line < NR_3215; line++) { | |
661 | if (!raw3215[line]) { | |
662 | raw3215[line] = raw; | |
663 | break; | |
664 | } | |
665 | } | |
666 | spin_unlock(&raw3215_device_lock); | |
667 | if (line == NR_3215) { | |
668 | kfree(raw); | |
669 | return -ENODEV; | |
670 | } | |
671 | ||
672 | raw->cdev = cdev; | |
1da177e4 LT |
673 | raw->inbuf = (char *) raw + sizeof(struct raw3215_info); |
674 | memset(raw, 0, sizeof(struct raw3215_info)); | |
5cbded58 | 675 | raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, |
1da177e4 LT |
676 | GFP_KERNEL|GFP_DMA); |
677 | if (raw->buffer == NULL) { | |
678 | spin_lock(&raw3215_device_lock); | |
d2c993d8 | 679 | raw3215[line] = NULL; |
1da177e4 LT |
680 | spin_unlock(&raw3215_device_lock); |
681 | kfree(raw); | |
682 | return -ENOMEM; | |
683 | } | |
1da177e4 LT |
684 | init_waitqueue_head(&raw->empty_wait); |
685 | ||
dff59b64 | 686 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
687 | cdev->handler = raw3215_irq; |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
77812a27 | 692 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
693 | { |
694 | struct raw3215_info *raw; | |
695 | ||
696 | ccw_device_set_offline(cdev); | |
dff59b64 | 697 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 698 | if (raw) { |
dff59b64 | 699 | dev_set_drvdata(&cdev->dev, NULL); |
17fd682e | 700 | kfree(raw->buffer); |
1da177e4 LT |
701 | kfree(raw); |
702 | } | |
703 | } | |
704 | ||
77812a27 | 705 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
706 | { |
707 | struct raw3215_info *raw; | |
708 | ||
dff59b64 | 709 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
710 | if (!raw) |
711 | return -ENODEV; | |
712 | ||
713 | return raw3215_startup(raw); | |
714 | } | |
715 | ||
77812a27 | 716 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
717 | { |
718 | struct raw3215_info *raw; | |
719 | ||
dff59b64 | 720 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
721 | if (!raw) |
722 | return -ENODEV; | |
723 | ||
724 | raw3215_shutdown(raw); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
77812a27 MS |
729 | static int raw3215_pm_stop(struct ccw_device *cdev) |
730 | { | |
731 | struct raw3215_info *raw; | |
732 | unsigned long flags; | |
733 | ||
734 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 735 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
736 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
737 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
738 | raw->flags |= RAW3215_FROZEN; | |
739 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | static int raw3215_pm_start(struct ccw_device *cdev) | |
744 | { | |
745 | struct raw3215_info *raw; | |
746 | unsigned long flags; | |
747 | ||
748 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 749 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
750 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
751 | raw->flags &= ~RAW3215_FROZEN; | |
752 | raw->flags |= RAW3215_FLUSHING; | |
753 | raw3215_try_io(raw); | |
754 | raw->flags &= ~RAW3215_FLUSHING; | |
755 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
756 | return 0; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | static struct ccw_device_id raw3215_id[] = { |
760 | { CCW_DEVICE(0x3215, 0) }, | |
761 | { /* end of list */ }, | |
762 | }; | |
763 | ||
764 | static struct ccw_driver raw3215_ccw_driver = { | |
765 | .name = "3215", | |
766 | .owner = THIS_MODULE, | |
767 | .ids = raw3215_id, | |
768 | .probe = &raw3215_probe, | |
769 | .remove = &raw3215_remove, | |
770 | .set_online = &raw3215_set_online, | |
771 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
772 | .freeze = &raw3215_pm_stop, |
773 | .thaw = &raw3215_pm_start, | |
774 | .restore = &raw3215_pm_start, | |
1da177e4 LT |
775 | }; |
776 | ||
777 | #ifdef CONFIG_TN3215_CONSOLE | |
778 | /* | |
779 | * Write a string to the 3215 console | |
780 | */ | |
77812a27 MS |
781 | static void con3215_write(struct console *co, const char *str, |
782 | unsigned int count) | |
1da177e4 LT |
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 | ||
805 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
806 | { | |
807 | *index = c->index; | |
808 | return tty3215_driver; | |
809 | } | |
810 | ||
811 | /* | |
2332ce1a HS |
812 | * panic() calls con3215_flush through a panic_notifier |
813 | * before the system enters a disabled, endless loop. | |
1da177e4 | 814 | */ |
77812a27 | 815 | static void con3215_flush(void) |
1da177e4 LT |
816 | { |
817 | struct raw3215_info *raw; | |
818 | unsigned long flags; | |
819 | ||
820 | raw = raw3215[0]; /* console 3215 is the first one */ | |
77812a27 MS |
821 | if (raw->flags & RAW3215_FROZEN) |
822 | /* The console is still frozen for suspend. */ | |
823 | if (ccw_device_force_console()) | |
824 | /* Forcing didn't work, no panic message .. */ | |
825 | return; | |
520a4e37 | 826 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 827 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 828 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
829 | } |
830 | ||
2332ce1a HS |
831 | static int con3215_notify(struct notifier_block *self, |
832 | unsigned long event, void *data) | |
833 | { | |
834 | con3215_flush(); | |
835 | return NOTIFY_OK; | |
836 | } | |
837 | ||
838 | static struct notifier_block on_panic_nb = { | |
839 | .notifier_call = con3215_notify, | |
840 | .priority = 0, | |
841 | }; | |
842 | ||
843 | static struct notifier_block on_reboot_nb = { | |
844 | .notifier_call = con3215_notify, | |
845 | .priority = 0, | |
846 | }; | |
847 | ||
1da177e4 LT |
848 | /* |
849 | * The console structure for the 3215 console | |
850 | */ | |
851 | static struct console con3215 = { | |
852 | .name = "ttyS", | |
853 | .write = con3215_write, | |
854 | .device = con3215_device, | |
1da177e4 LT |
855 | .flags = CON_PRINTBUFFER, |
856 | }; | |
857 | ||
858 | /* | |
859 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 860 | */ |
77812a27 | 861 | static int __init con3215_init(void) |
1da177e4 LT |
862 | { |
863 | struct ccw_device *cdev; | |
864 | struct raw3215_info *raw; | |
865 | struct raw3215_req *req; | |
866 | int i; | |
867 | ||
868 | /* Check if 3215 is to be the console */ | |
869 | if (!CONSOLE_IS_3215) | |
870 | return -ENODEV; | |
871 | ||
872 | /* Set the console mode for VM */ | |
873 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
874 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
875 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
876 | } |
877 | ||
878 | /* allocate 3215 request structures */ | |
879 | raw3215_freelist = NULL; | |
880 | spin_lock_init(&raw3215_freelist_lock); | |
881 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 882 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
883 | req->next = raw3215_freelist; |
884 | raw3215_freelist = req; | |
885 | } | |
886 | ||
887 | cdev = ccw_device_probe_console(); | |
600b5d16 | 888 | if (IS_ERR(cdev)) |
1da177e4 LT |
889 | return -ENODEV; |
890 | ||
891 | raw3215[0] = raw = (struct raw3215_info *) | |
6d56eee2 HC |
892 | kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); |
893 | raw->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
894 | raw->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
1da177e4 | 895 | raw->cdev = cdev; |
dff59b64 | 896 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
897 | cdev->handler = raw3215_irq; |
898 | ||
899 | raw->flags |= RAW3215_FIXED; | |
1da177e4 LT |
900 | init_waitqueue_head(&raw->empty_wait); |
901 | ||
902 | /* Request the console irq */ | |
903 | if (raw3215_startup(raw) != 0) { | |
6d56eee2 HC |
904 | kfree(raw->inbuf); |
905 | kfree(raw->buffer); | |
906 | kfree(raw); | |
1da177e4 | 907 | raw3215[0] = NULL; |
1da177e4 LT |
908 | return -ENODEV; |
909 | } | |
2332ce1a HS |
910 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
911 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
912 | register_console(&con3215); |
913 | return 0; | |
914 | } | |
915 | console_initcall(con3215_init); | |
916 | #endif | |
917 | ||
918 | /* | |
919 | * tty3215_open | |
920 | * | |
921 | * This routine is called whenever a 3215 tty is opened. | |
922 | */ | |
77812a27 | 923 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
924 | { |
925 | struct raw3215_info *raw; | |
926 | int retval, line; | |
927 | ||
928 | line = tty->index; | |
929 | if ((line < 0) || (line >= NR_3215)) | |
930 | return -ENODEV; | |
931 | ||
932 | raw = raw3215[line]; | |
933 | if (raw == NULL) | |
934 | return -ENODEV; | |
935 | ||
936 | tty->driver_data = raw; | |
937 | raw->tty = tty; | |
938 | ||
939 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
940 | /* | |
941 | * Start up 3215 device | |
942 | */ | |
943 | retval = raw3215_startup(raw); | |
944 | if (retval) | |
945 | return retval; | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | /* | |
951 | * tty3215_close() | |
952 | * | |
953 | * This routine is called when the 3215 tty is closed. We wait | |
954 | * for the remaining request to be completed. Then we clean up. | |
955 | */ | |
77812a27 | 956 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
957 | { |
958 | struct raw3215_info *raw; | |
959 | ||
960 | raw = (struct raw3215_info *) tty->driver_data; | |
961 | if (raw == NULL || tty->count > 1) | |
962 | return; | |
963 | tty->closing = 1; | |
964 | /* Shutdown the terminal */ | |
965 | raw3215_shutdown(raw); | |
966 | tty->closing = 0; | |
967 | raw->tty = NULL; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Returns the amount of free space in the output buffer. | |
972 | */ | |
77812a27 | 973 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
974 | { |
975 | struct raw3215_info *raw; | |
976 | ||
977 | raw = (struct raw3215_info *) tty->driver_data; | |
978 | ||
979 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
980 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
981 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
982 | else | |
983 | return 0; | |
984 | } | |
985 | ||
986 | /* | |
987 | * String write routine for 3215 ttys | |
988 | */ | |
77812a27 MS |
989 | static int tty3215_write(struct tty_struct * tty, |
990 | const unsigned char *buf, int count) | |
1da177e4 LT |
991 | { |
992 | struct raw3215_info *raw; | |
993 | ||
994 | if (!tty) | |
995 | return 0; | |
996 | raw = (struct raw3215_info *) tty->driver_data; | |
997 | raw3215_write(raw, buf, count); | |
998 | return count; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Put character routine for 3215 ttys | |
1003 | */ | |
77812a27 | 1004 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1005 | { |
1006 | struct raw3215_info *raw; | |
1007 | ||
1008 | if (!tty) | |
9e7c9a19 | 1009 | return 0; |
1da177e4 LT |
1010 | raw = (struct raw3215_info *) tty->driver_data; |
1011 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1012 | return 1; |
1da177e4 LT |
1013 | } |
1014 | ||
77812a27 | 1015 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1016 | { |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Returns the number of characters in the output buffer | |
1021 | */ | |
77812a27 | 1022 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1023 | { |
1024 | struct raw3215_info *raw; | |
1025 | ||
1026 | raw = (struct raw3215_info *) tty->driver_data; | |
1027 | return raw->count; | |
1028 | } | |
1029 | ||
77812a27 | 1030 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
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 | ||
1da177e4 LT |
1039 | /* |
1040 | * Disable reading from a 3215 tty | |
1041 | */ | |
77812a27 | 1042 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1043 | { |
1044 | struct raw3215_info *raw; | |
1045 | ||
1046 | raw = (struct raw3215_info *) tty->driver_data; | |
1047 | raw->flags |= RAW3215_THROTTLED; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Enable reading from a 3215 tty | |
1052 | */ | |
77812a27 | 1053 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1054 | { |
1055 | struct raw3215_info *raw; | |
1056 | unsigned long flags; | |
1057 | ||
1058 | raw = (struct raw3215_info *) tty->driver_data; | |
1059 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1060 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1061 | raw->flags &= ~RAW3215_THROTTLED; |
1062 | raw3215_try_io(raw); | |
520a4e37 | 1063 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1064 | } |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Disable writing to a 3215 tty | |
1069 | */ | |
77812a27 | 1070 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1071 | { |
1072 | struct raw3215_info *raw; | |
1073 | ||
1074 | raw = (struct raw3215_info *) tty->driver_data; | |
1075 | raw->flags |= RAW3215_STOPPED; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Enable writing to a 3215 tty | |
1080 | */ | |
77812a27 | 1081 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1082 | { |
1083 | struct raw3215_info *raw; | |
1084 | unsigned long flags; | |
1085 | ||
1086 | raw = (struct raw3215_info *) tty->driver_data; | |
1087 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1088 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1089 | raw->flags &= ~RAW3215_STOPPED; |
1090 | raw3215_try_io(raw); | |
520a4e37 | 1091 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1092 | } |
1093 | } | |
1094 | ||
b68e31d0 | 1095 | static const struct tty_operations tty3215_ops = { |
1da177e4 LT |
1096 | .open = tty3215_open, |
1097 | .close = tty3215_close, | |
1098 | .write = tty3215_write, | |
1099 | .put_char = tty3215_put_char, | |
1100 | .flush_chars = tty3215_flush_chars, | |
1101 | .write_room = tty3215_write_room, | |
1102 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1103 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1104 | .throttle = tty3215_throttle, |
1105 | .unthrottle = tty3215_unthrottle, | |
1106 | .stop = tty3215_stop, | |
1107 | .start = tty3215_start, | |
1108 | }; | |
1109 | ||
1110 | /* | |
1111 | * 3215 tty registration code called from tty_init(). | |
1112 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1113 | */ | |
77812a27 | 1114 | static int __init tty3215_init(void) |
1da177e4 LT |
1115 | { |
1116 | struct tty_driver *driver; | |
1117 | int ret; | |
1118 | ||
1119 | if (!CONSOLE_IS_3215) | |
1120 | return 0; | |
1121 | ||
1122 | driver = alloc_tty_driver(NR_3215); | |
1123 | if (!driver) | |
1124 | return -ENOMEM; | |
1125 | ||
1126 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1127 | if (ret) { | |
1128 | put_tty_driver(driver); | |
1129 | return ret; | |
1130 | } | |
1131 | /* | |
1132 | * Initialize the tty_driver structure | |
1133 | * Entries in tty3215_driver that are NOT initialized: | |
1134 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1135 | */ | |
1136 | ||
1137 | driver->owner = THIS_MODULE; | |
1138 | driver->driver_name = "tty3215"; | |
1139 | driver->name = "ttyS"; | |
1140 | driver->major = TTY_MAJOR; | |
1141 | driver->minor_start = 64; | |
1142 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1143 | driver->subtype = SYSTEM_TYPE_TTY; | |
1144 | driver->init_termios = tty_std_termios; | |
1145 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1146 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1147 | driver->init_termios.c_lflag = ISIG; | |
1148 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1149 | tty_set_operations(driver, &tty3215_ops); | |
1150 | ret = tty_register_driver(driver); | |
1151 | if (ret) { | |
1da177e4 LT |
1152 | put_tty_driver(driver); |
1153 | return ret; | |
1154 | } | |
1155 | tty3215_driver = driver; | |
1156 | return 0; | |
1157 | } | |
1158 | ||
77812a27 | 1159 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1160 | { |
1161 | tty_unregister_driver(tty3215_driver); | |
1162 | put_tty_driver(tty3215_driver); | |
1163 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1164 | } | |
1165 | ||
1166 | module_init(tty3215_init); | |
1167 | module_exit(tty3215_exit); |