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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 LT |
23 | |
24 | #include <linux/slab.h> | |
25 | #include <linux/bootmem.h> | |
26 | ||
27 | #include <asm/ccwdev.h> | |
28 | #include <asm/cio.h> | |
29 | #include <asm/io.h> | |
30 | #include <asm/ebcdic.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/delay.h> | |
33 | #include <asm/cpcmd.h> | |
34 | #include <asm/setup.h> | |
35 | ||
36 | #include "ctrlchar.h" | |
37 | ||
38 | #define NR_3215 1 | |
39 | #define NR_3215_REQ (4*NR_3215) | |
40 | #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ | |
41 | #define RAW3215_INBUF_SIZE 256 /* input buffer size */ | |
42 | #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ | |
43 | #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ | |
44 | #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ | |
45 | #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ | |
46 | #define RAW3215_NR_CCWS 3 | |
47 | #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ | |
48 | ||
49 | #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ | |
50 | #define RAW3215_ACTIVE 2 /* set if the device is in use */ | |
51 | #define RAW3215_WORKING 4 /* set if a request is being worked on */ | |
52 | #define RAW3215_THROTTLED 8 /* set if reading is disabled */ | |
53 | #define RAW3215_STOPPED 16 /* set if writing is disabled */ | |
54 | #define RAW3215_CLOSING 32 /* set while in close process */ | |
55 | #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ | |
56 | #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ | |
77812a27 | 57 | #define RAW3215_FROZEN 256 /* set if 3215 is frozen for suspend */ |
1da177e4 LT |
58 | |
59 | #define TAB_STOP_SIZE 8 /* tab stop size */ | |
60 | ||
61 | /* | |
62 | * Request types for a 3215 device | |
63 | */ | |
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 */ | |
1da177e4 LT |
91 | struct raw3215_req *queued_read; /* pointer to queued read requests */ |
92 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
93 | wait_queue_head_t empty_wait; /* wait queue for flushing */ | |
94 | struct timer_list timer; /* timer for delayed output */ | |
1da177e4 LT |
95 | int line_pos; /* position on the line (for tabs) */ |
96 | char ubuffer[80]; /* copy_from_user buffer */ | |
97 | }; | |
98 | ||
99 | /* array of 3215 devices structures */ | |
100 | static struct raw3215_info *raw3215[NR_3215]; | |
101 | /* spinlock to protect the raw3215 array */ | |
102 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
103 | /* list of free request structures */ | |
104 | static struct raw3215_req *raw3215_freelist; | |
105 | /* spinlock to protect free list */ | |
106 | static spinlock_t raw3215_freelist_lock; | |
107 | ||
108 | static struct tty_driver *tty3215_driver; | |
109 | ||
110 | /* | |
111 | * Get a request structure from the free list | |
112 | */ | |
77812a27 MS |
113 | static inline struct raw3215_req *raw3215_alloc_req(void) |
114 | { | |
1da177e4 LT |
115 | struct raw3215_req *req; |
116 | unsigned long flags; | |
117 | ||
118 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
119 | req = raw3215_freelist; | |
120 | raw3215_freelist = req->next; | |
121 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
122 | return req; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Put a request structure back to the free list | |
127 | */ | |
77812a27 MS |
128 | static inline void raw3215_free_req(struct raw3215_req *req) |
129 | { | |
1da177e4 LT |
130 | unsigned long flags; |
131 | ||
132 | if (req->type == RAW3215_FREE) | |
133 | return; /* don't free a free request */ | |
134 | req->type = RAW3215_FREE; | |
135 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
136 | req->next = raw3215_freelist; | |
137 | raw3215_freelist = req; | |
138 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
139 | } | |
140 | ||
141 | /* | |
142 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
143 | * If there is a queued read request it is used, but that shouldn't happen | |
144 | * because a 3215 terminal won't accept a new read before the old one is | |
145 | * completed. | |
146 | */ | |
77812a27 | 147 | static void raw3215_mk_read_req(struct raw3215_info *raw) |
1da177e4 LT |
148 | { |
149 | struct raw3215_req *req; | |
150 | struct ccw1 *ccw; | |
151 | ||
152 | /* there can only be ONE read request at a time */ | |
153 | req = raw->queued_read; | |
154 | if (req == NULL) { | |
155 | /* no queued read request, use new req structure */ | |
156 | req = raw3215_alloc_req(); | |
157 | req->type = RAW3215_READ; | |
158 | req->info = raw; | |
159 | raw->queued_read = req; | |
160 | } | |
161 | ||
162 | ccw = req->ccws; | |
163 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
164 | ccw->flags = 0x20; /* ignore incorrect length */ | |
165 | ccw->count = 160; | |
166 | ccw->cda = (__u32) __pa(raw->inbuf); | |
167 | } | |
168 | ||
169 | /* | |
170 | * Set up a write request with the information from the main structure. | |
171 | * A ccw chain is created that writes as much as possible from the output | |
172 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
173 | * the new, probably lengthened request. | |
174 | */ | |
77812a27 | 175 | static void raw3215_mk_write_req(struct raw3215_info *raw) |
1da177e4 LT |
176 | { |
177 | struct raw3215_req *req; | |
178 | struct ccw1 *ccw; | |
179 | int len, count, ix, lines; | |
180 | ||
181 | if (raw->count <= raw->written) | |
182 | return; | |
183 | /* check if there is a queued write request */ | |
184 | req = raw->queued_write; | |
185 | if (req == NULL) { | |
186 | /* no queued write request, use new req structure */ | |
187 | req = raw3215_alloc_req(); | |
188 | req->type = RAW3215_WRITE; | |
189 | req->info = raw; | |
190 | raw->queued_write = req; | |
191 | } else { | |
192 | raw->written -= req->len; | |
193 | } | |
194 | ||
195 | ccw = req->ccws; | |
196 | req->start = (raw->head - raw->count + raw->written) & | |
197 | (RAW3215_BUFFER_SIZE - 1); | |
198 | /* | |
199 | * now we have to count newlines. We can at max accept | |
200 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
201 | * a restriction in VM | |
202 | */ | |
203 | lines = 0; | |
204 | ix = req->start; | |
205 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
206 | if (raw->buffer[ix] == 0x15) | |
207 | lines++; | |
208 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
209 | } | |
210 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
211 | if (len > RAW3215_MAX_BYTES) | |
212 | len = RAW3215_MAX_BYTES; | |
213 | req->len = len; | |
214 | raw->written += len; | |
215 | ||
216 | /* set the indication if we should try to enlarge this request */ | |
217 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
218 | ||
219 | ix = req->start; | |
220 | while (len > 0) { | |
221 | if (ccw > req->ccws) | |
222 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
223 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
224 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
225 | ccw->cda = | |
226 | (__u32) __pa(raw->buffer + ix); | |
227 | count = len; | |
228 | if (ix + count > RAW3215_BUFFER_SIZE) | |
229 | count = RAW3215_BUFFER_SIZE - ix; | |
230 | ccw->count = count; | |
231 | len -= count; | |
232 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
233 | ccw++; | |
234 | } | |
235 | /* | |
236 | * Add a NOP to the channel program. 3215 devices are purely | |
237 | * emulated and its much better to avoid the channel end | |
238 | * interrupt in this case. | |
239 | */ | |
240 | if (ccw > req->ccws) | |
241 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
242 | ccw->cmd_code = 0x03; /* NOP */ | |
243 | ccw->flags = 0; | |
244 | ccw->cda = 0; | |
245 | ccw->count = 1; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Start a read or a write request | |
250 | */ | |
77812a27 | 251 | static void raw3215_start_io(struct raw3215_info *raw) |
1da177e4 LT |
252 | { |
253 | struct raw3215_req *req; | |
254 | int res; | |
255 | ||
256 | req = raw->queued_read; | |
257 | if (req != NULL && | |
258 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
259 | /* dequeue request */ | |
260 | raw->queued_read = NULL; | |
261 | res = ccw_device_start(raw->cdev, req->ccws, | |
262 | (unsigned long) req, 0, 0); | |
263 | if (res != 0) { | |
264 | /* do_IO failed, put request back to queue */ | |
265 | raw->queued_read = req; | |
266 | } else { | |
267 | raw->flags |= RAW3215_WORKING; | |
268 | } | |
269 | } | |
270 | req = raw->queued_write; | |
271 | if (req != NULL && | |
272 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
273 | /* dequeue request */ | |
274 | raw->queued_write = NULL; | |
275 | res = ccw_device_start(raw->cdev, req->ccws, | |
276 | (unsigned long) req, 0, 0); | |
277 | if (res != 0) { | |
278 | /* do_IO failed, put request back to queue */ | |
279 | raw->queued_write = req; | |
280 | } else { | |
281 | raw->flags |= RAW3215_WORKING; | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | /* | |
287 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
288 | */ | |
77812a27 | 289 | static void raw3215_timeout(unsigned long __data) |
1da177e4 LT |
290 | { |
291 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
292 | unsigned long flags; | |
293 | ||
520a4e37 | 294 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
295 | if (raw->flags & RAW3215_TIMER_RUNS) { |
296 | del_timer(&raw->timer); | |
297 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
77812a27 MS |
298 | if (!(raw->flags & RAW3215_FROZEN)) { |
299 | raw3215_mk_write_req(raw); | |
300 | raw3215_start_io(raw); | |
301 | } | |
1da177e4 | 302 | } |
520a4e37 | 303 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
304 | } |
305 | ||
306 | /* | |
307 | * Function to conditionally start an IO. A read is started immediately, | |
308 | * a write is only started immediately if the flush flag is on or the | |
309 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
310 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
311 | */ | |
77812a27 | 312 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 313 | { |
77812a27 | 314 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FROZEN)) |
1da177e4 LT |
315 | return; |
316 | if (raw->queued_read != NULL) | |
317 | raw3215_start_io(raw); | |
318 | else if (raw->queued_write != NULL) { | |
319 | if ((raw->queued_write->delayable == 0) || | |
320 | (raw->flags & RAW3215_FLUSHING)) { | |
321 | /* execute write requests bigger than minimum size */ | |
322 | raw3215_start_io(raw); | |
323 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
324 | del_timer(&raw->timer); | |
325 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
326 | } | |
327 | } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { | |
328 | /* delay small writes */ | |
329 | init_timer(&raw->timer); | |
330 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
331 | raw->timer.data = (unsigned long) raw; | |
332 | raw->timer.function = raw3215_timeout; | |
333 | add_timer(&raw->timer); | |
334 | raw->flags |= RAW3215_TIMER_RUNS; | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | /* | |
408aec3c | 340 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 341 | */ |
408aec3c | 342 | static void raw3215_next_io(struct raw3215_info *raw) |
1da177e4 | 343 | { |
1da177e4 | 344 | struct tty_struct *tty; |
1da177e4 | 345 | |
1da177e4 LT |
346 | raw3215_mk_write_req(raw); |
347 | raw3215_try_io(raw); | |
1da177e4 LT |
348 | tty = raw->tty; |
349 | if (tty != NULL && | |
350 | RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { | |
351 | tty_wakeup(tty); | |
352 | } | |
353 | } | |
354 | ||
355 | /* | |
356 | * Interrupt routine, called from common io layer | |
357 | */ | |
77812a27 MS |
358 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
359 | struct irb *irb) | |
1da177e4 LT |
360 | { |
361 | struct raw3215_info *raw; | |
362 | struct raw3215_req *req; | |
363 | struct tty_struct *tty; | |
364 | int cstat, dstat; | |
1d030370 | 365 | int count; |
1da177e4 | 366 | |
dff59b64 | 367 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 368 | req = (struct raw3215_req *) intparm; |
23d805b6 PO |
369 | cstat = irb->scsw.cmd.cstat; |
370 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 371 | if (cstat != 0) |
408aec3c | 372 | raw3215_next_io(raw); |
1da177e4 LT |
373 | if (dstat & 0x01) { /* we got a unit exception */ |
374 | dstat &= ~0x01; /* we can ignore it */ | |
375 | } | |
376 | switch (dstat) { | |
377 | case 0x80: | |
378 | if (cstat != 0) | |
379 | break; | |
380 | /* Attention interrupt, someone hit the enter key */ | |
381 | raw3215_mk_read_req(raw); | |
408aec3c | 382 | raw3215_next_io(raw); |
1da177e4 LT |
383 | break; |
384 | case 0x08: | |
385 | case 0x0C: | |
386 | /* Channel end interrupt. */ | |
387 | if ((raw = req->info) == NULL) | |
388 | return; /* That shouldn't happen ... */ | |
389 | if (req->type == RAW3215_READ) { | |
390 | /* store residual count, then wait for device end */ | |
23d805b6 | 391 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
392 | } |
393 | if (dstat == 0x08) | |
394 | break; | |
395 | case 0x04: | |
396 | /* Device end interrupt. */ | |
397 | if ((raw = req->info) == NULL) | |
398 | return; /* That shouldn't happen ... */ | |
399 | if (req->type == RAW3215_READ && raw->tty != NULL) { | |
400 | unsigned int cchar; | |
401 | ||
402 | tty = raw->tty; | |
403 | count = 160 - req->residual; | |
1da177e4 LT |
404 | EBCASC(raw->inbuf, count); |
405 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
406 | switch (cchar & CTRLCHAR_MASK) { | |
407 | case CTRLCHAR_SYSRQ: | |
408 | break; | |
409 | ||
410 | case CTRLCHAR_CTRL: | |
33f0f88f | 411 | tty_insert_flip_char(tty, cchar, TTY_NORMAL); |
1da177e4 LT |
412 | tty_flip_buffer_push(raw->tty); |
413 | break; | |
414 | ||
415 | case CTRLCHAR_NONE: | |
1da177e4 | 416 | if (count < 2 || |
33f0f88f AC |
417 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
418 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
419 | /* add the auto \n */ | |
420 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
421 | count++; |
422 | } else | |
33f0f88f AC |
423 | count -= 2; |
424 | tty_insert_flip_string(tty, raw->inbuf, count); | |
1da177e4 LT |
425 | tty_flip_buffer_push(raw->tty); |
426 | break; | |
427 | } | |
428 | } else if (req->type == RAW3215_WRITE) { | |
429 | raw->count -= req->len; | |
430 | raw->written -= req->len; | |
431 | } | |
432 | raw->flags &= ~RAW3215_WORKING; | |
433 | raw3215_free_req(req); | |
434 | /* check for empty wait */ | |
435 | if (waitqueue_active(&raw->empty_wait) && | |
436 | raw->queued_write == NULL && | |
437 | raw->queued_read == NULL) { | |
438 | wake_up_interruptible(&raw->empty_wait); | |
439 | } | |
408aec3c | 440 | raw3215_next_io(raw); |
1da177e4 LT |
441 | break; |
442 | default: | |
443 | /* Strange interrupt, I'll do my best to clean up */ | |
444 | if (req != NULL && req->type != RAW3215_FREE) { | |
445 | if (req->type == RAW3215_WRITE) { | |
446 | raw->count -= req->len; | |
447 | raw->written -= req->len; | |
448 | } | |
449 | raw->flags &= ~RAW3215_WORKING; | |
450 | raw3215_free_req(req); | |
451 | } | |
408aec3c | 452 | raw3215_next_io(raw); |
1da177e4 LT |
453 | } |
454 | return; | |
455 | } | |
456 | ||
77812a27 MS |
457 | /* |
458 | * Drop the oldest line from the output buffer. | |
459 | */ | |
460 | static void raw3215_drop_line(struct raw3215_info *raw) | |
461 | { | |
462 | int ix; | |
463 | char ch; | |
464 | ||
465 | BUG_ON(raw->written != 0); | |
466 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
467 | while (raw->count > 0) { | |
468 | ch = raw->buffer[ix]; | |
469 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
470 | raw->count--; | |
471 | if (ch == 0x15) | |
472 | break; | |
473 | } | |
474 | raw->head = ix; | |
475 | } | |
476 | ||
1da177e4 LT |
477 | /* |
478 | * Wait until length bytes are available int the output buffer. | |
479 | * Has to be called with the s390irq lock held. Can be called | |
480 | * disabled. | |
481 | */ | |
77812a27 | 482 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
483 | { |
484 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
485 | /* While console is frozen for suspend we have no other |
486 | * choice but to drop message from the buffer to make | |
487 | * room for even more messages. */ | |
488 | if (raw->flags & RAW3215_FROZEN) { | |
489 | raw3215_drop_line(raw); | |
490 | continue; | |
491 | } | |
1da177e4 LT |
492 | /* there might be a request pending */ |
493 | raw->flags |= RAW3215_FLUSHING; | |
494 | raw3215_mk_write_req(raw); | |
495 | raw3215_try_io(raw); | |
496 | raw->flags &= ~RAW3215_FLUSHING; | |
497 | #ifdef CONFIG_TN3215_CONSOLE | |
498 | wait_cons_dev(); | |
499 | #endif | |
500 | /* Enough room freed up ? */ | |
501 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
502 | break; | |
503 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 504 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 505 | udelay(100); |
520a4e37 | 506 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
507 | } |
508 | } | |
509 | ||
510 | /* | |
511 | * String write routine for 3215 devices | |
512 | */ | |
77812a27 MS |
513 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
514 | unsigned int length) | |
1da177e4 LT |
515 | { |
516 | unsigned long flags; | |
517 | int c, count; | |
518 | ||
519 | while (length > 0) { | |
520a4e37 | 520 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
521 | count = (length > RAW3215_BUFFER_SIZE) ? |
522 | RAW3215_BUFFER_SIZE : length; | |
523 | length -= count; | |
524 | ||
525 | raw3215_make_room(raw, count); | |
526 | ||
527 | /* copy string to output buffer and convert it to EBCDIC */ | |
528 | while (1) { | |
529 | c = min_t(int, count, | |
530 | min(RAW3215_BUFFER_SIZE - raw->count, | |
531 | RAW3215_BUFFER_SIZE - raw->head)); | |
532 | if (c <= 0) | |
533 | break; | |
534 | memcpy(raw->buffer + raw->head, str, c); | |
535 | ASCEBC(raw->buffer + raw->head, c); | |
536 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
537 | raw->count += c; | |
538 | raw->line_pos += c; | |
539 | str += c; | |
540 | count -= c; | |
541 | } | |
542 | if (!(raw->flags & RAW3215_WORKING)) { | |
543 | raw3215_mk_write_req(raw); | |
544 | /* start or queue request */ | |
545 | raw3215_try_io(raw); | |
546 | } | |
520a4e37 | 547 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
548 | } |
549 | } | |
550 | ||
551 | /* | |
552 | * Put character routine for 3215 devices | |
553 | */ | |
77812a27 | 554 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
555 | { |
556 | unsigned long flags; | |
557 | unsigned int length, i; | |
558 | ||
520a4e37 | 559 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
560 | if (ch == '\t') { |
561 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
562 | raw->line_pos += length; | |
563 | ch = ' '; | |
564 | } else if (ch == '\n') { | |
565 | length = 1; | |
566 | raw->line_pos = 0; | |
567 | } else { | |
568 | length = 1; | |
569 | raw->line_pos++; | |
570 | } | |
571 | raw3215_make_room(raw, length); | |
572 | ||
573 | for (i = 0; i < length; i++) { | |
574 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
575 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
576 | raw->count++; | |
577 | } | |
578 | if (!(raw->flags & RAW3215_WORKING)) { | |
579 | raw3215_mk_write_req(raw); | |
580 | /* start or queue request */ | |
581 | raw3215_try_io(raw); | |
582 | } | |
520a4e37 | 583 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
584 | } |
585 | ||
586 | /* | |
587 | * Flush routine, it simply sets the flush flag and tries to start | |
588 | * pending IO. | |
589 | */ | |
77812a27 | 590 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
591 | { |
592 | unsigned long flags; | |
593 | ||
520a4e37 | 594 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
595 | if (raw->count > 0) { |
596 | raw->flags |= RAW3215_FLUSHING; | |
597 | raw3215_try_io(raw); | |
598 | raw->flags &= ~RAW3215_FLUSHING; | |
599 | } | |
520a4e37 | 600 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
601 | } |
602 | ||
603 | /* | |
604 | * Fire up a 3215 device. | |
605 | */ | |
77812a27 | 606 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
607 | { |
608 | unsigned long flags; | |
609 | ||
610 | if (raw->flags & RAW3215_ACTIVE) | |
611 | return 0; | |
612 | raw->line_pos = 0; | |
613 | raw->flags |= RAW3215_ACTIVE; | |
520a4e37 | 614 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 615 | raw3215_try_io(raw); |
520a4e37 | 616 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
617 | |
618 | return 0; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Shutdown a 3215 device. | |
623 | */ | |
77812a27 | 624 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
625 | { |
626 | DECLARE_WAITQUEUE(wait, current); | |
627 | unsigned long flags; | |
628 | ||
629 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) | |
630 | return; | |
631 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 632 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
633 | if ((raw->flags & RAW3215_WORKING) || |
634 | raw->queued_write != NULL || | |
635 | raw->queued_read != NULL) { | |
636 | raw->flags |= RAW3215_CLOSING; | |
637 | add_wait_queue(&raw->empty_wait, &wait); | |
638 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 639 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 640 | schedule(); |
520a4e37 | 641 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
642 | remove_wait_queue(&raw->empty_wait, &wait); |
643 | set_current_state(TASK_RUNNING); | |
644 | raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); | |
645 | } | |
520a4e37 | 646 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
647 | } |
648 | ||
77812a27 | 649 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
650 | { |
651 | struct raw3215_info *raw; | |
652 | int line; | |
653 | ||
a2e53801 | 654 | /* Console is special. */ |
dff59b64 | 655 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 656 | return 0; |
1da177e4 LT |
657 | raw = kmalloc(sizeof(struct raw3215_info) + |
658 | RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); | |
659 | if (raw == NULL) | |
660 | return -ENOMEM; | |
661 | ||
662 | spin_lock(&raw3215_device_lock); | |
663 | for (line = 0; line < NR_3215; line++) { | |
664 | if (!raw3215[line]) { | |
665 | raw3215[line] = raw; | |
666 | break; | |
667 | } | |
668 | } | |
669 | spin_unlock(&raw3215_device_lock); | |
670 | if (line == NR_3215) { | |
671 | kfree(raw); | |
672 | return -ENODEV; | |
673 | } | |
674 | ||
675 | raw->cdev = cdev; | |
1da177e4 LT |
676 | raw->inbuf = (char *) raw + sizeof(struct raw3215_info); |
677 | memset(raw, 0, sizeof(struct raw3215_info)); | |
5cbded58 | 678 | raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, |
1da177e4 LT |
679 | GFP_KERNEL|GFP_DMA); |
680 | if (raw->buffer == NULL) { | |
681 | spin_lock(&raw3215_device_lock); | |
d2c993d8 | 682 | raw3215[line] = NULL; |
1da177e4 LT |
683 | spin_unlock(&raw3215_device_lock); |
684 | kfree(raw); | |
685 | return -ENOMEM; | |
686 | } | |
1da177e4 LT |
687 | init_waitqueue_head(&raw->empty_wait); |
688 | ||
dff59b64 | 689 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
690 | cdev->handler = raw3215_irq; |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
77812a27 | 695 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
696 | { |
697 | struct raw3215_info *raw; | |
698 | ||
699 | ccw_device_set_offline(cdev); | |
dff59b64 | 700 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 701 | if (raw) { |
dff59b64 | 702 | dev_set_drvdata(&cdev->dev, NULL); |
17fd682e | 703 | kfree(raw->buffer); |
1da177e4 LT |
704 | kfree(raw); |
705 | } | |
706 | } | |
707 | ||
77812a27 | 708 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
709 | { |
710 | struct raw3215_info *raw; | |
711 | ||
dff59b64 | 712 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
713 | if (!raw) |
714 | return -ENODEV; | |
715 | ||
716 | return raw3215_startup(raw); | |
717 | } | |
718 | ||
77812a27 | 719 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
720 | { |
721 | struct raw3215_info *raw; | |
722 | ||
dff59b64 | 723 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
724 | if (!raw) |
725 | return -ENODEV; | |
726 | ||
727 | raw3215_shutdown(raw); | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
77812a27 MS |
732 | static int raw3215_pm_stop(struct ccw_device *cdev) |
733 | { | |
734 | struct raw3215_info *raw; | |
735 | unsigned long flags; | |
736 | ||
737 | /* Empty the output buffer, then prevent new I/O. */ | |
738 | raw = cdev->dev.driver_data; | |
739 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); | |
740 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
741 | raw->flags |= RAW3215_FROZEN; | |
742 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
743 | return 0; | |
744 | } | |
745 | ||
746 | static int raw3215_pm_start(struct ccw_device *cdev) | |
747 | { | |
748 | struct raw3215_info *raw; | |
749 | unsigned long flags; | |
750 | ||
751 | /* Allow I/O again and flush output buffer. */ | |
752 | raw = cdev->dev.driver_data; | |
753 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); | |
754 | raw->flags &= ~RAW3215_FROZEN; | |
755 | raw->flags |= RAW3215_FLUSHING; | |
756 | raw3215_try_io(raw); | |
757 | raw->flags &= ~RAW3215_FLUSHING; | |
758 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
759 | return 0; | |
760 | } | |
761 | ||
1da177e4 LT |
762 | static struct ccw_device_id raw3215_id[] = { |
763 | { CCW_DEVICE(0x3215, 0) }, | |
764 | { /* end of list */ }, | |
765 | }; | |
766 | ||
767 | static struct ccw_driver raw3215_ccw_driver = { | |
768 | .name = "3215", | |
769 | .owner = THIS_MODULE, | |
770 | .ids = raw3215_id, | |
771 | .probe = &raw3215_probe, | |
772 | .remove = &raw3215_remove, | |
773 | .set_online = &raw3215_set_online, | |
774 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
775 | .freeze = &raw3215_pm_stop, |
776 | .thaw = &raw3215_pm_start, | |
777 | .restore = &raw3215_pm_start, | |
1da177e4 LT |
778 | }; |
779 | ||
780 | #ifdef CONFIG_TN3215_CONSOLE | |
781 | /* | |
782 | * Write a string to the 3215 console | |
783 | */ | |
77812a27 MS |
784 | static void con3215_write(struct console *co, const char *str, |
785 | unsigned int count) | |
1da177e4 LT |
786 | { |
787 | struct raw3215_info *raw; | |
788 | int i; | |
789 | ||
790 | if (count <= 0) | |
791 | return; | |
792 | raw = raw3215[0]; /* console 3215 is the first one */ | |
793 | while (count > 0) { | |
794 | for (i = 0; i < count; i++) | |
795 | if (str[i] == '\t' || str[i] == '\n') | |
796 | break; | |
797 | raw3215_write(raw, str, i); | |
798 | count -= i; | |
799 | str += i; | |
800 | if (count > 0) { | |
801 | raw3215_putchar(raw, *str); | |
802 | count--; | |
803 | str++; | |
804 | } | |
805 | } | |
806 | } | |
807 | ||
808 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
809 | { | |
810 | *index = c->index; | |
811 | return tty3215_driver; | |
812 | } | |
813 | ||
814 | /* | |
2332ce1a HS |
815 | * panic() calls con3215_flush through a panic_notifier |
816 | * before the system enters a disabled, endless loop. | |
1da177e4 | 817 | */ |
77812a27 | 818 | static void con3215_flush(void) |
1da177e4 LT |
819 | { |
820 | struct raw3215_info *raw; | |
821 | unsigned long flags; | |
822 | ||
823 | raw = raw3215[0]; /* console 3215 is the first one */ | |
77812a27 MS |
824 | if (raw->flags & RAW3215_FROZEN) |
825 | /* The console is still frozen for suspend. */ | |
826 | if (ccw_device_force_console()) | |
827 | /* Forcing didn't work, no panic message .. */ | |
828 | return; | |
520a4e37 | 829 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 830 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 831 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
832 | } |
833 | ||
2332ce1a HS |
834 | static int con3215_notify(struct notifier_block *self, |
835 | unsigned long event, void *data) | |
836 | { | |
837 | con3215_flush(); | |
838 | return NOTIFY_OK; | |
839 | } | |
840 | ||
841 | static struct notifier_block on_panic_nb = { | |
842 | .notifier_call = con3215_notify, | |
843 | .priority = 0, | |
844 | }; | |
845 | ||
846 | static struct notifier_block on_reboot_nb = { | |
847 | .notifier_call = con3215_notify, | |
848 | .priority = 0, | |
849 | }; | |
850 | ||
1da177e4 LT |
851 | /* |
852 | * The console structure for the 3215 console | |
853 | */ | |
854 | static struct console con3215 = { | |
855 | .name = "ttyS", | |
856 | .write = con3215_write, | |
857 | .device = con3215_device, | |
1da177e4 LT |
858 | .flags = CON_PRINTBUFFER, |
859 | }; | |
860 | ||
861 | /* | |
862 | * 3215 console initialization code called from console_init(). | |
863 | * NOTE: This is called before kmalloc is available. | |
864 | */ | |
77812a27 | 865 | static int __init con3215_init(void) |
1da177e4 LT |
866 | { |
867 | struct ccw_device *cdev; | |
868 | struct raw3215_info *raw; | |
869 | struct raw3215_req *req; | |
870 | int i; | |
871 | ||
872 | /* Check if 3215 is to be the console */ | |
873 | if (!CONSOLE_IS_3215) | |
874 | return -ENODEV; | |
875 | ||
876 | /* Set the console mode for VM */ | |
877 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
878 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
879 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
880 | } |
881 | ||
882 | /* allocate 3215 request structures */ | |
883 | raw3215_freelist = NULL; | |
884 | spin_lock_init(&raw3215_freelist_lock); | |
885 | for (i = 0; i < NR_3215_REQ; i++) { | |
886 | req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); | |
887 | req->next = raw3215_freelist; | |
888 | raw3215_freelist = req; | |
889 | } | |
890 | ||
891 | cdev = ccw_device_probe_console(); | |
600b5d16 | 892 | if (IS_ERR(cdev)) |
1da177e4 LT |
893 | return -ENODEV; |
894 | ||
895 | raw3215[0] = raw = (struct raw3215_info *) | |
896 | alloc_bootmem_low(sizeof(struct raw3215_info)); | |
897 | memset(raw, 0, sizeof(struct raw3215_info)); | |
898 | raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); | |
899 | raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); | |
900 | raw->cdev = cdev; | |
dff59b64 | 901 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
902 | cdev->handler = raw3215_irq; |
903 | ||
904 | raw->flags |= RAW3215_FIXED; | |
1da177e4 LT |
905 | init_waitqueue_head(&raw->empty_wait); |
906 | ||
907 | /* Request the console irq */ | |
908 | if (raw3215_startup(raw) != 0) { | |
909 | free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); | |
910 | free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); | |
911 | free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); | |
912 | raw3215[0] = NULL; | |
1da177e4 LT |
913 | return -ENODEV; |
914 | } | |
2332ce1a HS |
915 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
916 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
917 | register_console(&con3215); |
918 | return 0; | |
919 | } | |
920 | console_initcall(con3215_init); | |
921 | #endif | |
922 | ||
923 | /* | |
924 | * tty3215_open | |
925 | * | |
926 | * This routine is called whenever a 3215 tty is opened. | |
927 | */ | |
77812a27 | 928 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
929 | { |
930 | struct raw3215_info *raw; | |
931 | int retval, line; | |
932 | ||
933 | line = tty->index; | |
934 | if ((line < 0) || (line >= NR_3215)) | |
935 | return -ENODEV; | |
936 | ||
937 | raw = raw3215[line]; | |
938 | if (raw == NULL) | |
939 | return -ENODEV; | |
940 | ||
941 | tty->driver_data = raw; | |
942 | raw->tty = tty; | |
943 | ||
944 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
945 | /* | |
946 | * Start up 3215 device | |
947 | */ | |
948 | retval = raw3215_startup(raw); | |
949 | if (retval) | |
950 | return retval; | |
951 | ||
952 | return 0; | |
953 | } | |
954 | ||
955 | /* | |
956 | * tty3215_close() | |
957 | * | |
958 | * This routine is called when the 3215 tty is closed. We wait | |
959 | * for the remaining request to be completed. Then we clean up. | |
960 | */ | |
77812a27 | 961 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
962 | { |
963 | struct raw3215_info *raw; | |
964 | ||
965 | raw = (struct raw3215_info *) tty->driver_data; | |
966 | if (raw == NULL || tty->count > 1) | |
967 | return; | |
968 | tty->closing = 1; | |
969 | /* Shutdown the terminal */ | |
970 | raw3215_shutdown(raw); | |
971 | tty->closing = 0; | |
972 | raw->tty = NULL; | |
973 | } | |
974 | ||
975 | /* | |
976 | * Returns the amount of free space in the output buffer. | |
977 | */ | |
77812a27 | 978 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
979 | { |
980 | struct raw3215_info *raw; | |
981 | ||
982 | raw = (struct raw3215_info *) tty->driver_data; | |
983 | ||
984 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
985 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
986 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
987 | else | |
988 | return 0; | |
989 | } | |
990 | ||
991 | /* | |
992 | * String write routine for 3215 ttys | |
993 | */ | |
77812a27 MS |
994 | static int tty3215_write(struct tty_struct * tty, |
995 | const unsigned char *buf, int count) | |
1da177e4 LT |
996 | { |
997 | struct raw3215_info *raw; | |
998 | ||
999 | if (!tty) | |
1000 | return 0; | |
1001 | raw = (struct raw3215_info *) tty->driver_data; | |
1002 | raw3215_write(raw, buf, count); | |
1003 | return count; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Put character routine for 3215 ttys | |
1008 | */ | |
77812a27 | 1009 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1010 | { |
1011 | struct raw3215_info *raw; | |
1012 | ||
1013 | if (!tty) | |
9e7c9a19 | 1014 | return 0; |
1da177e4 LT |
1015 | raw = (struct raw3215_info *) tty->driver_data; |
1016 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1017 | return 1; |
1da177e4 LT |
1018 | } |
1019 | ||
77812a27 | 1020 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1021 | { |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Returns the number of characters in the output buffer | |
1026 | */ | |
77812a27 | 1027 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1028 | { |
1029 | struct raw3215_info *raw; | |
1030 | ||
1031 | raw = (struct raw3215_info *) tty->driver_data; | |
1032 | return raw->count; | |
1033 | } | |
1034 | ||
77812a27 | 1035 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1036 | { |
1037 | struct raw3215_info *raw; | |
1038 | ||
1039 | raw = (struct raw3215_info *) tty->driver_data; | |
1040 | raw3215_flush_buffer(raw); | |
1041 | tty_wakeup(tty); | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Currently we don't have any io controls for 3215 ttys | |
1046 | */ | |
77812a27 MS |
1047 | static int tty3215_ioctl(struct tty_struct *tty, struct file * file, |
1048 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
1049 | { |
1050 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1051 | return -EIO; | |
1052 | ||
1053 | switch (cmd) { | |
1054 | default: | |
1055 | return -ENOIOCTLCMD; | |
1056 | } | |
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * Disable reading from a 3215 tty | |
1062 | */ | |
77812a27 | 1063 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1064 | { |
1065 | struct raw3215_info *raw; | |
1066 | ||
1067 | raw = (struct raw3215_info *) tty->driver_data; | |
1068 | raw->flags |= RAW3215_THROTTLED; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Enable reading from a 3215 tty | |
1073 | */ | |
77812a27 | 1074 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1075 | { |
1076 | struct raw3215_info *raw; | |
1077 | unsigned long flags; | |
1078 | ||
1079 | raw = (struct raw3215_info *) tty->driver_data; | |
1080 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1081 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1082 | raw->flags &= ~RAW3215_THROTTLED; |
1083 | raw3215_try_io(raw); | |
520a4e37 | 1084 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1085 | } |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Disable writing to a 3215 tty | |
1090 | */ | |
77812a27 | 1091 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1092 | { |
1093 | struct raw3215_info *raw; | |
1094 | ||
1095 | raw = (struct raw3215_info *) tty->driver_data; | |
1096 | raw->flags |= RAW3215_STOPPED; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Enable writing to a 3215 tty | |
1101 | */ | |
77812a27 | 1102 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1103 | { |
1104 | struct raw3215_info *raw; | |
1105 | unsigned long flags; | |
1106 | ||
1107 | raw = (struct raw3215_info *) tty->driver_data; | |
1108 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1109 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1110 | raw->flags &= ~RAW3215_STOPPED; |
1111 | raw3215_try_io(raw); | |
520a4e37 | 1112 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1113 | } |
1114 | } | |
1115 | ||
b68e31d0 | 1116 | static const struct tty_operations tty3215_ops = { |
1da177e4 LT |
1117 | .open = tty3215_open, |
1118 | .close = tty3215_close, | |
1119 | .write = tty3215_write, | |
1120 | .put_char = tty3215_put_char, | |
1121 | .flush_chars = tty3215_flush_chars, | |
1122 | .write_room = tty3215_write_room, | |
1123 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1124 | .flush_buffer = tty3215_flush_buffer, | |
1125 | .ioctl = tty3215_ioctl, | |
1126 | .throttle = tty3215_throttle, | |
1127 | .unthrottle = tty3215_unthrottle, | |
1128 | .stop = tty3215_stop, | |
1129 | .start = tty3215_start, | |
1130 | }; | |
1131 | ||
1132 | /* | |
1133 | * 3215 tty registration code called from tty_init(). | |
1134 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1135 | */ | |
77812a27 | 1136 | static int __init tty3215_init(void) |
1da177e4 LT |
1137 | { |
1138 | struct tty_driver *driver; | |
1139 | int ret; | |
1140 | ||
1141 | if (!CONSOLE_IS_3215) | |
1142 | return 0; | |
1143 | ||
1144 | driver = alloc_tty_driver(NR_3215); | |
1145 | if (!driver) | |
1146 | return -ENOMEM; | |
1147 | ||
1148 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1149 | if (ret) { | |
1150 | put_tty_driver(driver); | |
1151 | return ret; | |
1152 | } | |
1153 | /* | |
1154 | * Initialize the tty_driver structure | |
1155 | * Entries in tty3215_driver that are NOT initialized: | |
1156 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1157 | */ | |
1158 | ||
1159 | driver->owner = THIS_MODULE; | |
1160 | driver->driver_name = "tty3215"; | |
1161 | driver->name = "ttyS"; | |
1162 | driver->major = TTY_MAJOR; | |
1163 | driver->minor_start = 64; | |
1164 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1165 | driver->subtype = SYSTEM_TYPE_TTY; | |
1166 | driver->init_termios = tty_std_termios; | |
1167 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1168 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1169 | driver->init_termios.c_lflag = ISIG; | |
1170 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1171 | tty_set_operations(driver, &tty3215_ops); | |
1172 | ret = tty_register_driver(driver); | |
1173 | if (ret) { | |
1da177e4 LT |
1174 | put_tty_driver(driver); |
1175 | return ret; | |
1176 | } | |
1177 | tty3215_driver = driver; | |
1178 | return 0; | |
1179 | } | |
1180 | ||
77812a27 | 1181 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1182 | { |
1183 | tty_unregister_driver(tty3215_driver); | |
1184 | put_tty_driver(tty3215_driver); | |
1185 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1186 | } | |
1187 | ||
1188 | module_init(tty3215_init); | |
1189 | module_exit(tty3215_exit); |