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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 | ||
12fae585 | 12 | #include <linux/kernel_stat.h> |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/types.h> | |
15 | #include <linux/kdev_t.h> | |
16 | #include <linux/tty.h> | |
33f0f88f | 17 | #include <linux/tty_flip.h> |
1da177e4 LT |
18 | #include <linux/vt_kern.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/console.h> | |
21 | #include <linux/interrupt.h> | |
600b5d16 | 22 | #include <linux/err.h> |
2332ce1a | 23 | #include <linux/reboot.h> |
1da177e4 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <asm/ccwdev.h> |
26 | #include <asm/cio.h> | |
27 | #include <asm/io.h> | |
28 | #include <asm/ebcdic.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/delay.h> | |
31 | #include <asm/cpcmd.h> | |
32 | #include <asm/setup.h> | |
33 | ||
34 | #include "ctrlchar.h" | |
35 | ||
36 | #define NR_3215 1 | |
37 | #define NR_3215_REQ (4*NR_3215) | |
38 | #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ | |
39 | #define RAW3215_INBUF_SIZE 256 /* input buffer size */ | |
40 | #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ | |
41 | #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ | |
42 | #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ | |
43 | #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ | |
44 | #define RAW3215_NR_CCWS 3 | |
45 | #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ | |
46 | ||
47 | #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ | |
48 | #define RAW3215_ACTIVE 2 /* set if the device is in use */ | |
49 | #define RAW3215_WORKING 4 /* set if a request is being worked on */ | |
50 | #define RAW3215_THROTTLED 8 /* set if reading is disabled */ | |
51 | #define RAW3215_STOPPED 16 /* set if writing is disabled */ | |
52 | #define RAW3215_CLOSING 32 /* set while in close process */ | |
53 | #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ | |
54 | #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ | |
77812a27 | 55 | #define RAW3215_FROZEN 256 /* set if 3215 is frozen for suspend */ |
1da177e4 LT |
56 | |
57 | #define TAB_STOP_SIZE 8 /* tab stop size */ | |
58 | ||
59 | /* | |
60 | * Request types for a 3215 device | |
61 | */ | |
62 | enum raw3215_type { | |
63 | RAW3215_FREE, RAW3215_READ, RAW3215_WRITE | |
64 | }; | |
65 | ||
66 | /* | |
67 | * Request structure for a 3215 device | |
68 | */ | |
69 | struct raw3215_req { | |
70 | enum raw3215_type type; /* type of the request */ | |
71 | int start, len; /* start index & len in output buffer */ | |
72 | int delayable; /* indication to wait for more data */ | |
73 | int residual; /* residual count for read request */ | |
74 | struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ | |
75 | struct raw3215_info *info; /* pointer to main structure */ | |
76 | struct raw3215_req *next; /* pointer to next request */ | |
77 | } __attribute__ ((aligned(8))); | |
78 | ||
79 | struct raw3215_info { | |
80 | struct ccw_device *cdev; /* device for tty driver */ | |
81 | spinlock_t *lock; /* pointer to irq lock */ | |
82 | int flags; /* state flags */ | |
83 | char *buffer; /* pointer to output buffer */ | |
84 | char *inbuf; /* pointer to input buffer */ | |
85 | int head; /* first free byte in output buffer */ | |
86 | int count; /* number of bytes in output buffer */ | |
87 | int written; /* number of bytes in write requests */ | |
88 | struct tty_struct *tty; /* pointer to tty structure if present */ | |
1da177e4 LT |
89 | struct raw3215_req *queued_read; /* pointer to queued read requests */ |
90 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
91 | wait_queue_head_t empty_wait; /* wait queue for flushing */ | |
92 | struct timer_list timer; /* timer for delayed output */ | |
1da177e4 LT |
93 | int line_pos; /* position on the line (for tabs) */ |
94 | char ubuffer[80]; /* copy_from_user buffer */ | |
95 | }; | |
96 | ||
97 | /* array of 3215 devices structures */ | |
98 | static struct raw3215_info *raw3215[NR_3215]; | |
99 | /* spinlock to protect the raw3215 array */ | |
100 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
101 | /* list of free request structures */ | |
102 | static struct raw3215_req *raw3215_freelist; | |
103 | /* spinlock to protect free list */ | |
104 | static spinlock_t raw3215_freelist_lock; | |
105 | ||
106 | static struct tty_driver *tty3215_driver; | |
107 | ||
108 | /* | |
109 | * Get a request structure from the free list | |
110 | */ | |
77812a27 MS |
111 | static inline struct raw3215_req *raw3215_alloc_req(void) |
112 | { | |
1da177e4 LT |
113 | struct raw3215_req *req; |
114 | unsigned long flags; | |
115 | ||
116 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
117 | req = raw3215_freelist; | |
118 | raw3215_freelist = req->next; | |
119 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
120 | return req; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Put a request structure back to the free list | |
125 | */ | |
77812a27 MS |
126 | static inline void raw3215_free_req(struct raw3215_req *req) |
127 | { | |
1da177e4 LT |
128 | unsigned long flags; |
129 | ||
130 | if (req->type == RAW3215_FREE) | |
131 | return; /* don't free a free request */ | |
132 | req->type = RAW3215_FREE; | |
133 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
134 | req->next = raw3215_freelist; | |
135 | raw3215_freelist = req; | |
136 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
141 | * If there is a queued read request it is used, but that shouldn't happen | |
142 | * because a 3215 terminal won't accept a new read before the old one is | |
143 | * completed. | |
144 | */ | |
77812a27 | 145 | static void raw3215_mk_read_req(struct raw3215_info *raw) |
1da177e4 LT |
146 | { |
147 | struct raw3215_req *req; | |
148 | struct ccw1 *ccw; | |
149 | ||
150 | /* there can only be ONE read request at a time */ | |
151 | req = raw->queued_read; | |
152 | if (req == NULL) { | |
153 | /* no queued read request, use new req structure */ | |
154 | req = raw3215_alloc_req(); | |
155 | req->type = RAW3215_READ; | |
156 | req->info = raw; | |
157 | raw->queued_read = req; | |
158 | } | |
159 | ||
160 | ccw = req->ccws; | |
161 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
162 | ccw->flags = 0x20; /* ignore incorrect length */ | |
163 | ccw->count = 160; | |
164 | ccw->cda = (__u32) __pa(raw->inbuf); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Set up a write request with the information from the main structure. | |
169 | * A ccw chain is created that writes as much as possible from the output | |
170 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
171 | * the new, probably lengthened request. | |
172 | */ | |
77812a27 | 173 | static void raw3215_mk_write_req(struct raw3215_info *raw) |
1da177e4 LT |
174 | { |
175 | struct raw3215_req *req; | |
176 | struct ccw1 *ccw; | |
177 | int len, count, ix, lines; | |
178 | ||
179 | if (raw->count <= raw->written) | |
180 | return; | |
181 | /* check if there is a queued write request */ | |
182 | req = raw->queued_write; | |
183 | if (req == NULL) { | |
184 | /* no queued write request, use new req structure */ | |
185 | req = raw3215_alloc_req(); | |
186 | req->type = RAW3215_WRITE; | |
187 | req->info = raw; | |
188 | raw->queued_write = req; | |
189 | } else { | |
190 | raw->written -= req->len; | |
191 | } | |
192 | ||
193 | ccw = req->ccws; | |
194 | req->start = (raw->head - raw->count + raw->written) & | |
195 | (RAW3215_BUFFER_SIZE - 1); | |
196 | /* | |
197 | * now we have to count newlines. We can at max accept | |
198 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
199 | * a restriction in VM | |
200 | */ | |
201 | lines = 0; | |
202 | ix = req->start; | |
203 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
204 | if (raw->buffer[ix] == 0x15) | |
205 | lines++; | |
206 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
207 | } | |
208 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
209 | if (len > RAW3215_MAX_BYTES) | |
210 | len = RAW3215_MAX_BYTES; | |
211 | req->len = len; | |
212 | raw->written += len; | |
213 | ||
214 | /* set the indication if we should try to enlarge this request */ | |
215 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
216 | ||
217 | ix = req->start; | |
218 | while (len > 0) { | |
219 | if (ccw > req->ccws) | |
220 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
221 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
222 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
223 | ccw->cda = | |
224 | (__u32) __pa(raw->buffer + ix); | |
225 | count = len; | |
226 | if (ix + count > RAW3215_BUFFER_SIZE) | |
227 | count = RAW3215_BUFFER_SIZE - ix; | |
228 | ccw->count = count; | |
229 | len -= count; | |
230 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
231 | ccw++; | |
232 | } | |
233 | /* | |
234 | * Add a NOP to the channel program. 3215 devices are purely | |
235 | * emulated and its much better to avoid the channel end | |
236 | * interrupt in this case. | |
237 | */ | |
238 | if (ccw > req->ccws) | |
239 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
240 | ccw->cmd_code = 0x03; /* NOP */ | |
241 | ccw->flags = 0; | |
242 | ccw->cda = 0; | |
243 | ccw->count = 1; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Start a read or a write request | |
248 | */ | |
77812a27 | 249 | static void raw3215_start_io(struct raw3215_info *raw) |
1da177e4 LT |
250 | { |
251 | struct raw3215_req *req; | |
252 | int res; | |
253 | ||
254 | req = raw->queued_read; | |
255 | if (req != NULL && | |
256 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
257 | /* dequeue request */ | |
258 | raw->queued_read = NULL; | |
259 | res = ccw_device_start(raw->cdev, req->ccws, | |
260 | (unsigned long) req, 0, 0); | |
261 | if (res != 0) { | |
262 | /* do_IO failed, put request back to queue */ | |
263 | raw->queued_read = req; | |
264 | } else { | |
265 | raw->flags |= RAW3215_WORKING; | |
266 | } | |
267 | } | |
268 | req = raw->queued_write; | |
269 | if (req != NULL && | |
270 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
271 | /* dequeue request */ | |
272 | raw->queued_write = NULL; | |
273 | res = ccw_device_start(raw->cdev, req->ccws, | |
274 | (unsigned long) req, 0, 0); | |
275 | if (res != 0) { | |
276 | /* do_IO failed, put request back to queue */ | |
277 | raw->queued_write = req; | |
278 | } else { | |
279 | raw->flags |= RAW3215_WORKING; | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
286 | */ | |
77812a27 | 287 | static void raw3215_timeout(unsigned long __data) |
1da177e4 LT |
288 | { |
289 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
290 | unsigned long flags; | |
291 | ||
520a4e37 | 292 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
293 | if (raw->flags & RAW3215_TIMER_RUNS) { |
294 | del_timer(&raw->timer); | |
295 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
77812a27 MS |
296 | if (!(raw->flags & RAW3215_FROZEN)) { |
297 | raw3215_mk_write_req(raw); | |
298 | raw3215_start_io(raw); | |
299 | } | |
1da177e4 | 300 | } |
520a4e37 | 301 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
302 | } |
303 | ||
304 | /* | |
305 | * Function to conditionally start an IO. A read is started immediately, | |
306 | * a write is only started immediately if the flush flag is on or the | |
307 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
308 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
309 | */ | |
77812a27 | 310 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 311 | { |
77812a27 | 312 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FROZEN)) |
1da177e4 LT |
313 | return; |
314 | if (raw->queued_read != NULL) | |
315 | raw3215_start_io(raw); | |
316 | else if (raw->queued_write != NULL) { | |
317 | if ((raw->queued_write->delayable == 0) || | |
318 | (raw->flags & RAW3215_FLUSHING)) { | |
319 | /* execute write requests bigger than minimum size */ | |
320 | raw3215_start_io(raw); | |
321 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
322 | del_timer(&raw->timer); | |
323 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
324 | } | |
325 | } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { | |
326 | /* delay small writes */ | |
327 | init_timer(&raw->timer); | |
328 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
329 | raw->timer.data = (unsigned long) raw; | |
330 | raw->timer.function = raw3215_timeout; | |
331 | add_timer(&raw->timer); | |
332 | raw->flags |= RAW3215_TIMER_RUNS; | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | /* | |
408aec3c | 338 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 339 | */ |
408aec3c | 340 | static void raw3215_next_io(struct raw3215_info *raw) |
1da177e4 | 341 | { |
1da177e4 | 342 | struct tty_struct *tty; |
1da177e4 | 343 | |
1da177e4 LT |
344 | raw3215_mk_write_req(raw); |
345 | raw3215_try_io(raw); | |
1da177e4 LT |
346 | tty = raw->tty; |
347 | if (tty != NULL && | |
348 | RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { | |
349 | tty_wakeup(tty); | |
350 | } | |
351 | } | |
352 | ||
353 | /* | |
354 | * Interrupt routine, called from common io layer | |
355 | */ | |
77812a27 MS |
356 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
357 | struct irb *irb) | |
1da177e4 LT |
358 | { |
359 | struct raw3215_info *raw; | |
360 | struct raw3215_req *req; | |
361 | struct tty_struct *tty; | |
362 | int cstat, dstat; | |
1d030370 | 363 | int count; |
1da177e4 | 364 | |
12fae585 | 365 | kstat_cpu(smp_processor_id()).irqs[IOINT_C15]++; |
dff59b64 | 366 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 367 | req = (struct raw3215_req *) intparm; |
23d805b6 PO |
368 | cstat = irb->scsw.cmd.cstat; |
369 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 370 | if (cstat != 0) |
408aec3c | 371 | raw3215_next_io(raw); |
1da177e4 LT |
372 | if (dstat & 0x01) { /* we got a unit exception */ |
373 | dstat &= ~0x01; /* we can ignore it */ | |
374 | } | |
375 | switch (dstat) { | |
376 | case 0x80: | |
377 | if (cstat != 0) | |
378 | break; | |
379 | /* Attention interrupt, someone hit the enter key */ | |
380 | raw3215_mk_read_req(raw); | |
408aec3c | 381 | raw3215_next_io(raw); |
1da177e4 LT |
382 | break; |
383 | case 0x08: | |
384 | case 0x0C: | |
385 | /* Channel end interrupt. */ | |
386 | if ((raw = req->info) == NULL) | |
387 | return; /* That shouldn't happen ... */ | |
388 | if (req->type == RAW3215_READ) { | |
389 | /* store residual count, then wait for device end */ | |
23d805b6 | 390 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
391 | } |
392 | if (dstat == 0x08) | |
393 | break; | |
394 | case 0x04: | |
395 | /* Device end interrupt. */ | |
396 | if ((raw = req->info) == NULL) | |
397 | return; /* That shouldn't happen ... */ | |
398 | if (req->type == RAW3215_READ && raw->tty != NULL) { | |
399 | unsigned int cchar; | |
400 | ||
401 | tty = raw->tty; | |
402 | count = 160 - req->residual; | |
1da177e4 LT |
403 | EBCASC(raw->inbuf, count); |
404 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
405 | switch (cchar & CTRLCHAR_MASK) { | |
406 | case CTRLCHAR_SYSRQ: | |
407 | break; | |
408 | ||
409 | case CTRLCHAR_CTRL: | |
33f0f88f | 410 | tty_insert_flip_char(tty, cchar, TTY_NORMAL); |
1da177e4 LT |
411 | tty_flip_buffer_push(raw->tty); |
412 | break; | |
413 | ||
414 | case CTRLCHAR_NONE: | |
1da177e4 | 415 | if (count < 2 || |
33f0f88f AC |
416 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
417 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
418 | /* add the auto \n */ | |
419 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
420 | count++; |
421 | } else | |
33f0f88f AC |
422 | count -= 2; |
423 | tty_insert_flip_string(tty, raw->inbuf, count); | |
1da177e4 LT |
424 | tty_flip_buffer_push(raw->tty); |
425 | break; | |
426 | } | |
427 | } else if (req->type == RAW3215_WRITE) { | |
428 | raw->count -= req->len; | |
429 | raw->written -= req->len; | |
430 | } | |
431 | raw->flags &= ~RAW3215_WORKING; | |
432 | raw3215_free_req(req); | |
433 | /* check for empty wait */ | |
434 | if (waitqueue_active(&raw->empty_wait) && | |
435 | raw->queued_write == NULL && | |
436 | raw->queued_read == NULL) { | |
437 | wake_up_interruptible(&raw->empty_wait); | |
438 | } | |
408aec3c | 439 | raw3215_next_io(raw); |
1da177e4 LT |
440 | break; |
441 | default: | |
442 | /* Strange interrupt, I'll do my best to clean up */ | |
443 | if (req != NULL && req->type != RAW3215_FREE) { | |
444 | if (req->type == RAW3215_WRITE) { | |
445 | raw->count -= req->len; | |
446 | raw->written -= req->len; | |
447 | } | |
448 | raw->flags &= ~RAW3215_WORKING; | |
449 | raw3215_free_req(req); | |
450 | } | |
408aec3c | 451 | raw3215_next_io(raw); |
1da177e4 LT |
452 | } |
453 | return; | |
454 | } | |
455 | ||
77812a27 MS |
456 | /* |
457 | * Drop the oldest line from the output buffer. | |
458 | */ | |
459 | static void raw3215_drop_line(struct raw3215_info *raw) | |
460 | { | |
461 | int ix; | |
462 | char ch; | |
463 | ||
464 | BUG_ON(raw->written != 0); | |
465 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
466 | while (raw->count > 0) { | |
467 | ch = raw->buffer[ix]; | |
468 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
469 | raw->count--; | |
470 | if (ch == 0x15) | |
471 | break; | |
472 | } | |
473 | raw->head = ix; | |
474 | } | |
475 | ||
1da177e4 LT |
476 | /* |
477 | * Wait until length bytes are available int the output buffer. | |
478 | * Has to be called with the s390irq lock held. Can be called | |
479 | * disabled. | |
480 | */ | |
77812a27 | 481 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
482 | { |
483 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
484 | /* While console is frozen for suspend we have no other |
485 | * choice but to drop message from the buffer to make | |
486 | * room for even more messages. */ | |
487 | if (raw->flags & RAW3215_FROZEN) { | |
488 | raw3215_drop_line(raw); | |
489 | continue; | |
490 | } | |
1da177e4 LT |
491 | /* there might be a request pending */ |
492 | raw->flags |= RAW3215_FLUSHING; | |
493 | raw3215_mk_write_req(raw); | |
494 | raw3215_try_io(raw); | |
495 | raw->flags &= ~RAW3215_FLUSHING; | |
496 | #ifdef CONFIG_TN3215_CONSOLE | |
497 | wait_cons_dev(); | |
498 | #endif | |
499 | /* Enough room freed up ? */ | |
500 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
501 | break; | |
502 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 503 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 504 | udelay(100); |
520a4e37 | 505 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
506 | } |
507 | } | |
508 | ||
509 | /* | |
510 | * String write routine for 3215 devices | |
511 | */ | |
77812a27 MS |
512 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
513 | unsigned int length) | |
1da177e4 LT |
514 | { |
515 | unsigned long flags; | |
516 | int c, count; | |
517 | ||
518 | while (length > 0) { | |
520a4e37 | 519 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
520 | count = (length > RAW3215_BUFFER_SIZE) ? |
521 | RAW3215_BUFFER_SIZE : length; | |
522 | length -= count; | |
523 | ||
524 | raw3215_make_room(raw, count); | |
525 | ||
526 | /* copy string to output buffer and convert it to EBCDIC */ | |
527 | while (1) { | |
528 | c = min_t(int, count, | |
529 | min(RAW3215_BUFFER_SIZE - raw->count, | |
530 | RAW3215_BUFFER_SIZE - raw->head)); | |
531 | if (c <= 0) | |
532 | break; | |
533 | memcpy(raw->buffer + raw->head, str, c); | |
534 | ASCEBC(raw->buffer + raw->head, c); | |
535 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
536 | raw->count += c; | |
537 | raw->line_pos += c; | |
538 | str += c; | |
539 | count -= c; | |
540 | } | |
541 | if (!(raw->flags & RAW3215_WORKING)) { | |
542 | raw3215_mk_write_req(raw); | |
543 | /* start or queue request */ | |
544 | raw3215_try_io(raw); | |
545 | } | |
520a4e37 | 546 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
547 | } |
548 | } | |
549 | ||
550 | /* | |
551 | * Put character routine for 3215 devices | |
552 | */ | |
77812a27 | 553 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
554 | { |
555 | unsigned long flags; | |
556 | unsigned int length, i; | |
557 | ||
520a4e37 | 558 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
559 | if (ch == '\t') { |
560 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
561 | raw->line_pos += length; | |
562 | ch = ' '; | |
563 | } else if (ch == '\n') { | |
564 | length = 1; | |
565 | raw->line_pos = 0; | |
566 | } else { | |
567 | length = 1; | |
568 | raw->line_pos++; | |
569 | } | |
570 | raw3215_make_room(raw, length); | |
571 | ||
572 | for (i = 0; i < length; i++) { | |
573 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
574 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
575 | raw->count++; | |
576 | } | |
577 | if (!(raw->flags & RAW3215_WORKING)) { | |
578 | raw3215_mk_write_req(raw); | |
579 | /* start or queue request */ | |
580 | raw3215_try_io(raw); | |
581 | } | |
520a4e37 | 582 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
583 | } |
584 | ||
585 | /* | |
586 | * Flush routine, it simply sets the flush flag and tries to start | |
587 | * pending IO. | |
588 | */ | |
77812a27 | 589 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
590 | { |
591 | unsigned long flags; | |
592 | ||
520a4e37 | 593 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
594 | if (raw->count > 0) { |
595 | raw->flags |= RAW3215_FLUSHING; | |
596 | raw3215_try_io(raw); | |
597 | raw->flags &= ~RAW3215_FLUSHING; | |
598 | } | |
520a4e37 | 599 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
600 | } |
601 | ||
602 | /* | |
603 | * Fire up a 3215 device. | |
604 | */ | |
77812a27 | 605 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
606 | { |
607 | unsigned long flags; | |
608 | ||
609 | if (raw->flags & RAW3215_ACTIVE) | |
610 | return 0; | |
611 | raw->line_pos = 0; | |
612 | raw->flags |= RAW3215_ACTIVE; | |
520a4e37 | 613 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 614 | raw3215_try_io(raw); |
520a4e37 | 615 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
616 | |
617 | return 0; | |
618 | } | |
619 | ||
620 | /* | |
621 | * Shutdown a 3215 device. | |
622 | */ | |
77812a27 | 623 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
624 | { |
625 | DECLARE_WAITQUEUE(wait, current); | |
626 | unsigned long flags; | |
627 | ||
628 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) | |
629 | return; | |
630 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 631 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
632 | if ((raw->flags & RAW3215_WORKING) || |
633 | raw->queued_write != NULL || | |
634 | raw->queued_read != NULL) { | |
635 | raw->flags |= RAW3215_CLOSING; | |
636 | add_wait_queue(&raw->empty_wait, &wait); | |
637 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 638 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 639 | schedule(); |
520a4e37 | 640 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
641 | remove_wait_queue(&raw->empty_wait, &wait); |
642 | set_current_state(TASK_RUNNING); | |
643 | raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); | |
644 | } | |
520a4e37 | 645 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
646 | } |
647 | ||
77812a27 | 648 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
649 | { |
650 | struct raw3215_info *raw; | |
651 | int line; | |
652 | ||
a2e53801 | 653 | /* Console is special. */ |
dff59b64 | 654 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 655 | return 0; |
1da177e4 LT |
656 | raw = kmalloc(sizeof(struct raw3215_info) + |
657 | RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); | |
658 | if (raw == NULL) | |
659 | return -ENOMEM; | |
660 | ||
661 | spin_lock(&raw3215_device_lock); | |
662 | for (line = 0; line < NR_3215; line++) { | |
663 | if (!raw3215[line]) { | |
664 | raw3215[line] = raw; | |
665 | break; | |
666 | } | |
667 | } | |
668 | spin_unlock(&raw3215_device_lock); | |
669 | if (line == NR_3215) { | |
670 | kfree(raw); | |
671 | return -ENODEV; | |
672 | } | |
673 | ||
674 | raw->cdev = cdev; | |
1da177e4 LT |
675 | raw->inbuf = (char *) raw + sizeof(struct raw3215_info); |
676 | memset(raw, 0, sizeof(struct raw3215_info)); | |
5cbded58 | 677 | raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, |
1da177e4 LT |
678 | GFP_KERNEL|GFP_DMA); |
679 | if (raw->buffer == NULL) { | |
680 | spin_lock(&raw3215_device_lock); | |
d2c993d8 | 681 | raw3215[line] = NULL; |
1da177e4 LT |
682 | spin_unlock(&raw3215_device_lock); |
683 | kfree(raw); | |
684 | return -ENOMEM; | |
685 | } | |
1da177e4 LT |
686 | init_waitqueue_head(&raw->empty_wait); |
687 | ||
dff59b64 | 688 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
689 | cdev->handler = raw3215_irq; |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
77812a27 | 694 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
695 | { |
696 | struct raw3215_info *raw; | |
697 | ||
698 | ccw_device_set_offline(cdev); | |
dff59b64 | 699 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 700 | if (raw) { |
dff59b64 | 701 | dev_set_drvdata(&cdev->dev, NULL); |
17fd682e | 702 | kfree(raw->buffer); |
1da177e4 LT |
703 | kfree(raw); |
704 | } | |
705 | } | |
706 | ||
77812a27 | 707 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
708 | { |
709 | struct raw3215_info *raw; | |
710 | ||
dff59b64 | 711 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
712 | if (!raw) |
713 | return -ENODEV; | |
714 | ||
715 | return raw3215_startup(raw); | |
716 | } | |
717 | ||
77812a27 | 718 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
719 | { |
720 | struct raw3215_info *raw; | |
721 | ||
dff59b64 | 722 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
723 | if (!raw) |
724 | return -ENODEV; | |
725 | ||
726 | raw3215_shutdown(raw); | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
77812a27 MS |
731 | static int raw3215_pm_stop(struct ccw_device *cdev) |
732 | { | |
733 | struct raw3215_info *raw; | |
734 | unsigned long flags; | |
735 | ||
736 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 737 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
738 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
739 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
740 | raw->flags |= RAW3215_FROZEN; | |
741 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static int raw3215_pm_start(struct ccw_device *cdev) | |
746 | { | |
747 | struct raw3215_info *raw; | |
748 | unsigned long flags; | |
749 | ||
750 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 751 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
752 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
753 | raw->flags &= ~RAW3215_FROZEN; | |
754 | raw->flags |= RAW3215_FLUSHING; | |
755 | raw3215_try_io(raw); | |
756 | raw->flags &= ~RAW3215_FLUSHING; | |
757 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
758 | return 0; | |
759 | } | |
760 | ||
1da177e4 LT |
761 | static struct ccw_device_id raw3215_id[] = { |
762 | { CCW_DEVICE(0x3215, 0) }, | |
763 | { /* end of list */ }, | |
764 | }; | |
765 | ||
766 | static struct ccw_driver raw3215_ccw_driver = { | |
767 | .name = "3215", | |
768 | .owner = THIS_MODULE, | |
769 | .ids = raw3215_id, | |
770 | .probe = &raw3215_probe, | |
771 | .remove = &raw3215_remove, | |
772 | .set_online = &raw3215_set_online, | |
773 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
774 | .freeze = &raw3215_pm_stop, |
775 | .thaw = &raw3215_pm_start, | |
776 | .restore = &raw3215_pm_start, | |
1da177e4 LT |
777 | }; |
778 | ||
779 | #ifdef CONFIG_TN3215_CONSOLE | |
780 | /* | |
781 | * Write a string to the 3215 console | |
782 | */ | |
77812a27 MS |
783 | static void con3215_write(struct console *co, const char *str, |
784 | unsigned int count) | |
1da177e4 LT |
785 | { |
786 | struct raw3215_info *raw; | |
787 | int i; | |
788 | ||
789 | if (count <= 0) | |
790 | return; | |
791 | raw = raw3215[0]; /* console 3215 is the first one */ | |
792 | while (count > 0) { | |
793 | for (i = 0; i < count; i++) | |
794 | if (str[i] == '\t' || str[i] == '\n') | |
795 | break; | |
796 | raw3215_write(raw, str, i); | |
797 | count -= i; | |
798 | str += i; | |
799 | if (count > 0) { | |
800 | raw3215_putchar(raw, *str); | |
801 | count--; | |
802 | str++; | |
803 | } | |
804 | } | |
805 | } | |
806 | ||
807 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
808 | { | |
809 | *index = c->index; | |
810 | return tty3215_driver; | |
811 | } | |
812 | ||
813 | /* | |
2332ce1a HS |
814 | * panic() calls con3215_flush through a panic_notifier |
815 | * before the system enters a disabled, endless loop. | |
1da177e4 | 816 | */ |
77812a27 | 817 | static void con3215_flush(void) |
1da177e4 LT |
818 | { |
819 | struct raw3215_info *raw; | |
820 | unsigned long flags; | |
821 | ||
822 | raw = raw3215[0]; /* console 3215 is the first one */ | |
77812a27 MS |
823 | if (raw->flags & RAW3215_FROZEN) |
824 | /* The console is still frozen for suspend. */ | |
825 | if (ccw_device_force_console()) | |
826 | /* Forcing didn't work, no panic message .. */ | |
827 | return; | |
520a4e37 | 828 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 829 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 830 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
831 | } |
832 | ||
2332ce1a HS |
833 | static int con3215_notify(struct notifier_block *self, |
834 | unsigned long event, void *data) | |
835 | { | |
836 | con3215_flush(); | |
837 | return NOTIFY_OK; | |
838 | } | |
839 | ||
840 | static struct notifier_block on_panic_nb = { | |
841 | .notifier_call = con3215_notify, | |
842 | .priority = 0, | |
843 | }; | |
844 | ||
845 | static struct notifier_block on_reboot_nb = { | |
846 | .notifier_call = con3215_notify, | |
847 | .priority = 0, | |
848 | }; | |
849 | ||
1da177e4 LT |
850 | /* |
851 | * The console structure for the 3215 console | |
852 | */ | |
853 | static struct console con3215 = { | |
854 | .name = "ttyS", | |
855 | .write = con3215_write, | |
856 | .device = con3215_device, | |
1da177e4 LT |
857 | .flags = CON_PRINTBUFFER, |
858 | }; | |
859 | ||
860 | /* | |
861 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 862 | */ |
77812a27 | 863 | static int __init con3215_init(void) |
1da177e4 LT |
864 | { |
865 | struct ccw_device *cdev; | |
866 | struct raw3215_info *raw; | |
867 | struct raw3215_req *req; | |
868 | int i; | |
869 | ||
870 | /* Check if 3215 is to be the console */ | |
871 | if (!CONSOLE_IS_3215) | |
872 | return -ENODEV; | |
873 | ||
874 | /* Set the console mode for VM */ | |
875 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
876 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
877 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
878 | } |
879 | ||
880 | /* allocate 3215 request structures */ | |
881 | raw3215_freelist = NULL; | |
882 | spin_lock_init(&raw3215_freelist_lock); | |
883 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 884 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
885 | req->next = raw3215_freelist; |
886 | raw3215_freelist = req; | |
887 | } | |
888 | ||
889 | cdev = ccw_device_probe_console(); | |
600b5d16 | 890 | if (IS_ERR(cdev)) |
1da177e4 LT |
891 | return -ENODEV; |
892 | ||
893 | raw3215[0] = raw = (struct raw3215_info *) | |
6d56eee2 HC |
894 | kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); |
895 | raw->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
896 | raw->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
1da177e4 | 897 | raw->cdev = cdev; |
dff59b64 | 898 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
899 | cdev->handler = raw3215_irq; |
900 | ||
901 | raw->flags |= RAW3215_FIXED; | |
1da177e4 LT |
902 | init_waitqueue_head(&raw->empty_wait); |
903 | ||
904 | /* Request the console irq */ | |
905 | if (raw3215_startup(raw) != 0) { | |
6d56eee2 HC |
906 | kfree(raw->inbuf); |
907 | kfree(raw->buffer); | |
908 | kfree(raw); | |
1da177e4 | 909 | raw3215[0] = NULL; |
1da177e4 LT |
910 | return -ENODEV; |
911 | } | |
2332ce1a HS |
912 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
913 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
914 | register_console(&con3215); |
915 | return 0; | |
916 | } | |
917 | console_initcall(con3215_init); | |
918 | #endif | |
919 | ||
920 | /* | |
921 | * tty3215_open | |
922 | * | |
923 | * This routine is called whenever a 3215 tty is opened. | |
924 | */ | |
77812a27 | 925 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
926 | { |
927 | struct raw3215_info *raw; | |
928 | int retval, line; | |
929 | ||
930 | line = tty->index; | |
931 | if ((line < 0) || (line >= NR_3215)) | |
932 | return -ENODEV; | |
933 | ||
934 | raw = raw3215[line]; | |
935 | if (raw == NULL) | |
936 | return -ENODEV; | |
937 | ||
938 | tty->driver_data = raw; | |
939 | raw->tty = tty; | |
940 | ||
941 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
942 | /* | |
943 | * Start up 3215 device | |
944 | */ | |
945 | retval = raw3215_startup(raw); | |
946 | if (retval) | |
947 | return retval; | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
952 | /* | |
953 | * tty3215_close() | |
954 | * | |
955 | * This routine is called when the 3215 tty is closed. We wait | |
956 | * for the remaining request to be completed. Then we clean up. | |
957 | */ | |
77812a27 | 958 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
959 | { |
960 | struct raw3215_info *raw; | |
961 | ||
962 | raw = (struct raw3215_info *) tty->driver_data; | |
963 | if (raw == NULL || tty->count > 1) | |
964 | return; | |
965 | tty->closing = 1; | |
966 | /* Shutdown the terminal */ | |
967 | raw3215_shutdown(raw); | |
968 | tty->closing = 0; | |
969 | raw->tty = NULL; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Returns the amount of free space in the output buffer. | |
974 | */ | |
77812a27 | 975 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
976 | { |
977 | struct raw3215_info *raw; | |
978 | ||
979 | raw = (struct raw3215_info *) tty->driver_data; | |
980 | ||
981 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
982 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
983 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
984 | else | |
985 | return 0; | |
986 | } | |
987 | ||
988 | /* | |
989 | * String write routine for 3215 ttys | |
990 | */ | |
77812a27 MS |
991 | static int tty3215_write(struct tty_struct * tty, |
992 | const unsigned char *buf, int count) | |
1da177e4 LT |
993 | { |
994 | struct raw3215_info *raw; | |
995 | ||
996 | if (!tty) | |
997 | return 0; | |
998 | raw = (struct raw3215_info *) tty->driver_data; | |
999 | raw3215_write(raw, buf, count); | |
1000 | return count; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Put character routine for 3215 ttys | |
1005 | */ | |
77812a27 | 1006 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1007 | { |
1008 | struct raw3215_info *raw; | |
1009 | ||
1010 | if (!tty) | |
9e7c9a19 | 1011 | return 0; |
1da177e4 LT |
1012 | raw = (struct raw3215_info *) tty->driver_data; |
1013 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1014 | return 1; |
1da177e4 LT |
1015 | } |
1016 | ||
77812a27 | 1017 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1018 | { |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Returns the number of characters in the output buffer | |
1023 | */ | |
77812a27 | 1024 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1025 | { |
1026 | struct raw3215_info *raw; | |
1027 | ||
1028 | raw = (struct raw3215_info *) tty->driver_data; | |
1029 | return raw->count; | |
1030 | } | |
1031 | ||
77812a27 | 1032 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1033 | { |
1034 | struct raw3215_info *raw; | |
1035 | ||
1036 | raw = (struct raw3215_info *) tty->driver_data; | |
1037 | raw3215_flush_buffer(raw); | |
1038 | tty_wakeup(tty); | |
1039 | } | |
1040 | ||
1da177e4 LT |
1041 | /* |
1042 | * Disable reading from a 3215 tty | |
1043 | */ | |
77812a27 | 1044 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1045 | { |
1046 | struct raw3215_info *raw; | |
1047 | ||
1048 | raw = (struct raw3215_info *) tty->driver_data; | |
1049 | raw->flags |= RAW3215_THROTTLED; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Enable reading from a 3215 tty | |
1054 | */ | |
77812a27 | 1055 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1056 | { |
1057 | struct raw3215_info *raw; | |
1058 | unsigned long flags; | |
1059 | ||
1060 | raw = (struct raw3215_info *) tty->driver_data; | |
1061 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1062 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1063 | raw->flags &= ~RAW3215_THROTTLED; |
1064 | raw3215_try_io(raw); | |
520a4e37 | 1065 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1066 | } |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Disable writing to a 3215 tty | |
1071 | */ | |
77812a27 | 1072 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1073 | { |
1074 | struct raw3215_info *raw; | |
1075 | ||
1076 | raw = (struct raw3215_info *) tty->driver_data; | |
1077 | raw->flags |= RAW3215_STOPPED; | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Enable writing to a 3215 tty | |
1082 | */ | |
77812a27 | 1083 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1084 | { |
1085 | struct raw3215_info *raw; | |
1086 | unsigned long flags; | |
1087 | ||
1088 | raw = (struct raw3215_info *) tty->driver_data; | |
1089 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1090 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1091 | raw->flags &= ~RAW3215_STOPPED; |
1092 | raw3215_try_io(raw); | |
520a4e37 | 1093 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1094 | } |
1095 | } | |
1096 | ||
b68e31d0 | 1097 | static const struct tty_operations tty3215_ops = { |
1da177e4 LT |
1098 | .open = tty3215_open, |
1099 | .close = tty3215_close, | |
1100 | .write = tty3215_write, | |
1101 | .put_char = tty3215_put_char, | |
1102 | .flush_chars = tty3215_flush_chars, | |
1103 | .write_room = tty3215_write_room, | |
1104 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1105 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1106 | .throttle = tty3215_throttle, |
1107 | .unthrottle = tty3215_unthrottle, | |
1108 | .stop = tty3215_stop, | |
1109 | .start = tty3215_start, | |
1110 | }; | |
1111 | ||
1112 | /* | |
1113 | * 3215 tty registration code called from tty_init(). | |
1114 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1115 | */ | |
77812a27 | 1116 | static int __init tty3215_init(void) |
1da177e4 LT |
1117 | { |
1118 | struct tty_driver *driver; | |
1119 | int ret; | |
1120 | ||
1121 | if (!CONSOLE_IS_3215) | |
1122 | return 0; | |
1123 | ||
1124 | driver = alloc_tty_driver(NR_3215); | |
1125 | if (!driver) | |
1126 | return -ENOMEM; | |
1127 | ||
1128 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1129 | if (ret) { | |
1130 | put_tty_driver(driver); | |
1131 | return ret; | |
1132 | } | |
1133 | /* | |
1134 | * Initialize the tty_driver structure | |
1135 | * Entries in tty3215_driver that are NOT initialized: | |
1136 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1137 | */ | |
1138 | ||
1139 | driver->owner = THIS_MODULE; | |
1140 | driver->driver_name = "tty3215"; | |
1141 | driver->name = "ttyS"; | |
1142 | driver->major = TTY_MAJOR; | |
1143 | driver->minor_start = 64; | |
1144 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1145 | driver->subtype = SYSTEM_TYPE_TTY; | |
1146 | driver->init_termios = tty_std_termios; | |
1147 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1148 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1149 | driver->init_termios.c_lflag = ISIG; | |
1150 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1151 | tty_set_operations(driver, &tty3215_ops); | |
1152 | ret = tty_register_driver(driver); | |
1153 | if (ret) { | |
1da177e4 LT |
1154 | put_tty_driver(driver); |
1155 | return ret; | |
1156 | } | |
1157 | tty3215_driver = driver; | |
1158 | return 0; | |
1159 | } | |
1160 | ||
77812a27 | 1161 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1162 | { |
1163 | tty_unregister_driver(tty3215_driver); | |
1164 | put_tty_driver(tty3215_driver); | |
1165 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1166 | } | |
1167 | ||
1168 | module_init(tty3215_init); | |
1169 | module_exit(tty3215_exit); |