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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 */ | |
656d9125 | 90 | struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ |
1da177e4 LT |
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 | ||
656d9125 MS |
337 | /* |
338 | * Call tty_wakeup from tasklet context | |
339 | */ | |
340 | static void raw3215_wakeup(unsigned long data) | |
341 | { | |
342 | struct raw3215_info *raw = (struct raw3215_info *) data; | |
343 | tty_wakeup(raw->tty); | |
344 | } | |
345 | ||
1da177e4 | 346 | /* |
408aec3c | 347 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 348 | */ |
408aec3c | 349 | static void raw3215_next_io(struct raw3215_info *raw) |
1da177e4 | 350 | { |
1da177e4 LT |
351 | raw3215_mk_write_req(raw); |
352 | raw3215_try_io(raw); | |
656d9125 MS |
353 | if (raw->tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) |
354 | tasklet_schedule(&raw->tlet); | |
1da177e4 LT |
355 | } |
356 | ||
357 | /* | |
358 | * Interrupt routine, called from common io layer | |
359 | */ | |
77812a27 MS |
360 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
361 | struct irb *irb) | |
1da177e4 LT |
362 | { |
363 | struct raw3215_info *raw; | |
364 | struct raw3215_req *req; | |
365 | struct tty_struct *tty; | |
366 | int cstat, dstat; | |
1d030370 | 367 | int count; |
1da177e4 | 368 | |
dff59b64 | 369 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 370 | req = (struct raw3215_req *) intparm; |
23d805b6 PO |
371 | cstat = irb->scsw.cmd.cstat; |
372 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 373 | if (cstat != 0) |
408aec3c | 374 | raw3215_next_io(raw); |
1da177e4 LT |
375 | if (dstat & 0x01) { /* we got a unit exception */ |
376 | dstat &= ~0x01; /* we can ignore it */ | |
377 | } | |
378 | switch (dstat) { | |
379 | case 0x80: | |
380 | if (cstat != 0) | |
381 | break; | |
382 | /* Attention interrupt, someone hit the enter key */ | |
383 | raw3215_mk_read_req(raw); | |
408aec3c | 384 | raw3215_next_io(raw); |
1da177e4 LT |
385 | break; |
386 | case 0x08: | |
387 | case 0x0C: | |
388 | /* Channel end interrupt. */ | |
389 | if ((raw = req->info) == NULL) | |
390 | return; /* That shouldn't happen ... */ | |
391 | if (req->type == RAW3215_READ) { | |
392 | /* store residual count, then wait for device end */ | |
23d805b6 | 393 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
394 | } |
395 | if (dstat == 0x08) | |
396 | break; | |
397 | case 0x04: | |
398 | /* Device end interrupt. */ | |
399 | if ((raw = req->info) == NULL) | |
400 | return; /* That shouldn't happen ... */ | |
401 | if (req->type == RAW3215_READ && raw->tty != NULL) { | |
402 | unsigned int cchar; | |
403 | ||
404 | tty = raw->tty; | |
405 | count = 160 - req->residual; | |
1da177e4 LT |
406 | EBCASC(raw->inbuf, count); |
407 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
408 | switch (cchar & CTRLCHAR_MASK) { | |
409 | case CTRLCHAR_SYSRQ: | |
410 | break; | |
411 | ||
412 | case CTRLCHAR_CTRL: | |
33f0f88f | 413 | tty_insert_flip_char(tty, cchar, TTY_NORMAL); |
1da177e4 LT |
414 | tty_flip_buffer_push(raw->tty); |
415 | break; | |
416 | ||
417 | case CTRLCHAR_NONE: | |
1da177e4 | 418 | if (count < 2 || |
33f0f88f AC |
419 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
420 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
421 | /* add the auto \n */ | |
422 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
423 | count++; |
424 | } else | |
33f0f88f AC |
425 | count -= 2; |
426 | tty_insert_flip_string(tty, raw->inbuf, count); | |
1da177e4 LT |
427 | tty_flip_buffer_push(raw->tty); |
428 | break; | |
429 | } | |
430 | } else if (req->type == RAW3215_WRITE) { | |
431 | raw->count -= req->len; | |
432 | raw->written -= req->len; | |
433 | } | |
434 | raw->flags &= ~RAW3215_WORKING; | |
435 | raw3215_free_req(req); | |
436 | /* check for empty wait */ | |
437 | if (waitqueue_active(&raw->empty_wait) && | |
438 | raw->queued_write == NULL && | |
439 | raw->queued_read == NULL) { | |
440 | wake_up_interruptible(&raw->empty_wait); | |
441 | } | |
408aec3c | 442 | raw3215_next_io(raw); |
1da177e4 LT |
443 | break; |
444 | default: | |
445 | /* Strange interrupt, I'll do my best to clean up */ | |
446 | if (req != NULL && req->type != RAW3215_FREE) { | |
447 | if (req->type == RAW3215_WRITE) { | |
448 | raw->count -= req->len; | |
449 | raw->written -= req->len; | |
450 | } | |
451 | raw->flags &= ~RAW3215_WORKING; | |
452 | raw3215_free_req(req); | |
453 | } | |
408aec3c | 454 | raw3215_next_io(raw); |
1da177e4 LT |
455 | } |
456 | return; | |
457 | } | |
458 | ||
77812a27 MS |
459 | /* |
460 | * Drop the oldest line from the output buffer. | |
461 | */ | |
462 | static void raw3215_drop_line(struct raw3215_info *raw) | |
463 | { | |
464 | int ix; | |
465 | char ch; | |
466 | ||
467 | BUG_ON(raw->written != 0); | |
468 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
469 | while (raw->count > 0) { | |
470 | ch = raw->buffer[ix]; | |
471 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
472 | raw->count--; | |
473 | if (ch == 0x15) | |
474 | break; | |
475 | } | |
476 | raw->head = ix; | |
477 | } | |
478 | ||
1da177e4 LT |
479 | /* |
480 | * Wait until length bytes are available int the output buffer. | |
481 | * Has to be called with the s390irq lock held. Can be called | |
482 | * disabled. | |
483 | */ | |
77812a27 | 484 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
485 | { |
486 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
487 | /* While console is frozen for suspend we have no other |
488 | * choice but to drop message from the buffer to make | |
489 | * room for even more messages. */ | |
490 | if (raw->flags & RAW3215_FROZEN) { | |
491 | raw3215_drop_line(raw); | |
492 | continue; | |
493 | } | |
1da177e4 LT |
494 | /* there might be a request pending */ |
495 | raw->flags |= RAW3215_FLUSHING; | |
496 | raw3215_mk_write_req(raw); | |
497 | raw3215_try_io(raw); | |
498 | raw->flags &= ~RAW3215_FLUSHING; | |
499 | #ifdef CONFIG_TN3215_CONSOLE | |
500 | wait_cons_dev(); | |
501 | #endif | |
502 | /* Enough room freed up ? */ | |
503 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
504 | break; | |
505 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 506 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 507 | udelay(100); |
520a4e37 | 508 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
509 | } |
510 | } | |
511 | ||
512 | /* | |
513 | * String write routine for 3215 devices | |
514 | */ | |
77812a27 MS |
515 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
516 | unsigned int length) | |
1da177e4 LT |
517 | { |
518 | unsigned long flags; | |
519 | int c, count; | |
520 | ||
521 | while (length > 0) { | |
520a4e37 | 522 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
523 | count = (length > RAW3215_BUFFER_SIZE) ? |
524 | RAW3215_BUFFER_SIZE : length; | |
525 | length -= count; | |
526 | ||
527 | raw3215_make_room(raw, count); | |
528 | ||
529 | /* copy string to output buffer and convert it to EBCDIC */ | |
530 | while (1) { | |
531 | c = min_t(int, count, | |
532 | min(RAW3215_BUFFER_SIZE - raw->count, | |
533 | RAW3215_BUFFER_SIZE - raw->head)); | |
534 | if (c <= 0) | |
535 | break; | |
536 | memcpy(raw->buffer + raw->head, str, c); | |
537 | ASCEBC(raw->buffer + raw->head, c); | |
538 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
539 | raw->count += c; | |
540 | raw->line_pos += c; | |
541 | str += c; | |
542 | count -= c; | |
543 | } | |
544 | if (!(raw->flags & RAW3215_WORKING)) { | |
545 | raw3215_mk_write_req(raw); | |
546 | /* start or queue request */ | |
547 | raw3215_try_io(raw); | |
548 | } | |
520a4e37 | 549 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
550 | } |
551 | } | |
552 | ||
553 | /* | |
554 | * Put character routine for 3215 devices | |
555 | */ | |
77812a27 | 556 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
557 | { |
558 | unsigned long flags; | |
559 | unsigned int length, i; | |
560 | ||
520a4e37 | 561 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
562 | if (ch == '\t') { |
563 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
564 | raw->line_pos += length; | |
565 | ch = ' '; | |
566 | } else if (ch == '\n') { | |
567 | length = 1; | |
568 | raw->line_pos = 0; | |
569 | } else { | |
570 | length = 1; | |
571 | raw->line_pos++; | |
572 | } | |
573 | raw3215_make_room(raw, length); | |
574 | ||
575 | for (i = 0; i < length; i++) { | |
576 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
577 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
578 | raw->count++; | |
579 | } | |
580 | if (!(raw->flags & RAW3215_WORKING)) { | |
581 | raw3215_mk_write_req(raw); | |
582 | /* start or queue request */ | |
583 | raw3215_try_io(raw); | |
584 | } | |
520a4e37 | 585 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
586 | } |
587 | ||
588 | /* | |
589 | * Flush routine, it simply sets the flush flag and tries to start | |
590 | * pending IO. | |
591 | */ | |
77812a27 | 592 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
593 | { |
594 | unsigned long flags; | |
595 | ||
520a4e37 | 596 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
597 | if (raw->count > 0) { |
598 | raw->flags |= RAW3215_FLUSHING; | |
599 | raw3215_try_io(raw); | |
600 | raw->flags &= ~RAW3215_FLUSHING; | |
601 | } | |
520a4e37 | 602 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
603 | } |
604 | ||
605 | /* | |
606 | * Fire up a 3215 device. | |
607 | */ | |
77812a27 | 608 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
609 | { |
610 | unsigned long flags; | |
611 | ||
612 | if (raw->flags & RAW3215_ACTIVE) | |
613 | return 0; | |
614 | raw->line_pos = 0; | |
615 | raw->flags |= RAW3215_ACTIVE; | |
520a4e37 | 616 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 617 | raw3215_try_io(raw); |
520a4e37 | 618 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
619 | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Shutdown a 3215 device. | |
625 | */ | |
77812a27 | 626 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
627 | { |
628 | DECLARE_WAITQUEUE(wait, current); | |
629 | unsigned long flags; | |
630 | ||
631 | if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) | |
632 | return; | |
633 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 634 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
635 | if ((raw->flags & RAW3215_WORKING) || |
636 | raw->queued_write != NULL || | |
637 | raw->queued_read != NULL) { | |
638 | raw->flags |= RAW3215_CLOSING; | |
639 | add_wait_queue(&raw->empty_wait, &wait); | |
640 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 641 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 642 | schedule(); |
520a4e37 | 643 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
644 | remove_wait_queue(&raw->empty_wait, &wait); |
645 | set_current_state(TASK_RUNNING); | |
646 | raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); | |
647 | } | |
520a4e37 | 648 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
649 | } |
650 | ||
77812a27 | 651 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
652 | { |
653 | struct raw3215_info *raw; | |
654 | int line; | |
655 | ||
a2e53801 | 656 | /* Console is special. */ |
dff59b64 | 657 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 658 | return 0; |
1da177e4 LT |
659 | raw = kmalloc(sizeof(struct raw3215_info) + |
660 | RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); | |
661 | if (raw == NULL) | |
662 | return -ENOMEM; | |
663 | ||
664 | spin_lock(&raw3215_device_lock); | |
665 | for (line = 0; line < NR_3215; line++) { | |
666 | if (!raw3215[line]) { | |
667 | raw3215[line] = raw; | |
668 | break; | |
669 | } | |
670 | } | |
671 | spin_unlock(&raw3215_device_lock); | |
672 | if (line == NR_3215) { | |
673 | kfree(raw); | |
674 | return -ENODEV; | |
675 | } | |
676 | ||
677 | raw->cdev = cdev; | |
1da177e4 LT |
678 | raw->inbuf = (char *) raw + sizeof(struct raw3215_info); |
679 | memset(raw, 0, sizeof(struct raw3215_info)); | |
5cbded58 | 680 | raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, |
1da177e4 LT |
681 | GFP_KERNEL|GFP_DMA); |
682 | if (raw->buffer == NULL) { | |
683 | spin_lock(&raw3215_device_lock); | |
d2c993d8 | 684 | raw3215[line] = NULL; |
1da177e4 LT |
685 | spin_unlock(&raw3215_device_lock); |
686 | kfree(raw); | |
687 | return -ENOMEM; | |
688 | } | |
1da177e4 | 689 | init_waitqueue_head(&raw->empty_wait); |
656d9125 | 690 | tasklet_init(&raw->tlet, raw3215_wakeup, (unsigned long) raw); |
1da177e4 | 691 | |
dff59b64 | 692 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
693 | cdev->handler = raw3215_irq; |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
77812a27 | 698 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
699 | { |
700 | struct raw3215_info *raw; | |
701 | ||
702 | ccw_device_set_offline(cdev); | |
dff59b64 | 703 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 704 | if (raw) { |
dff59b64 | 705 | dev_set_drvdata(&cdev->dev, NULL); |
17fd682e | 706 | kfree(raw->buffer); |
1da177e4 LT |
707 | kfree(raw); |
708 | } | |
709 | } | |
710 | ||
77812a27 | 711 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
712 | { |
713 | struct raw3215_info *raw; | |
714 | ||
dff59b64 | 715 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
716 | if (!raw) |
717 | return -ENODEV; | |
718 | ||
719 | return raw3215_startup(raw); | |
720 | } | |
721 | ||
77812a27 | 722 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
723 | { |
724 | struct raw3215_info *raw; | |
725 | ||
dff59b64 | 726 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
727 | if (!raw) |
728 | return -ENODEV; | |
729 | ||
730 | raw3215_shutdown(raw); | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
77812a27 MS |
735 | static int raw3215_pm_stop(struct ccw_device *cdev) |
736 | { | |
737 | struct raw3215_info *raw; | |
738 | unsigned long flags; | |
739 | ||
740 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 741 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
742 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
743 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
744 | raw->flags |= RAW3215_FROZEN; | |
745 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static int raw3215_pm_start(struct ccw_device *cdev) | |
750 | { | |
751 | struct raw3215_info *raw; | |
752 | unsigned long flags; | |
753 | ||
754 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 755 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
756 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
757 | raw->flags &= ~RAW3215_FROZEN; | |
758 | raw->flags |= RAW3215_FLUSHING; | |
759 | raw3215_try_io(raw); | |
760 | raw->flags &= ~RAW3215_FLUSHING; | |
761 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
762 | return 0; | |
763 | } | |
764 | ||
1da177e4 LT |
765 | static struct ccw_device_id raw3215_id[] = { |
766 | { CCW_DEVICE(0x3215, 0) }, | |
767 | { /* end of list */ }, | |
768 | }; | |
769 | ||
770 | static struct ccw_driver raw3215_ccw_driver = { | |
3bda058b SO |
771 | .driver = { |
772 | .name = "3215", | |
773 | .owner = THIS_MODULE, | |
774 | }, | |
1da177e4 LT |
775 | .ids = raw3215_id, |
776 | .probe = &raw3215_probe, | |
777 | .remove = &raw3215_remove, | |
778 | .set_online = &raw3215_set_online, | |
779 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
780 | .freeze = &raw3215_pm_stop, |
781 | .thaw = &raw3215_pm_start, | |
782 | .restore = &raw3215_pm_start, | |
de400d6b | 783 | .int_class = IOINT_C15, |
1da177e4 LT |
784 | }; |
785 | ||
786 | #ifdef CONFIG_TN3215_CONSOLE | |
787 | /* | |
788 | * Write a string to the 3215 console | |
789 | */ | |
77812a27 MS |
790 | static void con3215_write(struct console *co, const char *str, |
791 | unsigned int count) | |
1da177e4 LT |
792 | { |
793 | struct raw3215_info *raw; | |
794 | int i; | |
795 | ||
796 | if (count <= 0) | |
797 | return; | |
798 | raw = raw3215[0]; /* console 3215 is the first one */ | |
799 | while (count > 0) { | |
800 | for (i = 0; i < count; i++) | |
801 | if (str[i] == '\t' || str[i] == '\n') | |
802 | break; | |
803 | raw3215_write(raw, str, i); | |
804 | count -= i; | |
805 | str += i; | |
806 | if (count > 0) { | |
807 | raw3215_putchar(raw, *str); | |
808 | count--; | |
809 | str++; | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
815 | { | |
816 | *index = c->index; | |
817 | return tty3215_driver; | |
818 | } | |
819 | ||
820 | /* | |
2332ce1a HS |
821 | * panic() calls con3215_flush through a panic_notifier |
822 | * before the system enters a disabled, endless loop. | |
1da177e4 | 823 | */ |
77812a27 | 824 | static void con3215_flush(void) |
1da177e4 LT |
825 | { |
826 | struct raw3215_info *raw; | |
827 | unsigned long flags; | |
828 | ||
829 | raw = raw3215[0]; /* console 3215 is the first one */ | |
77812a27 MS |
830 | if (raw->flags & RAW3215_FROZEN) |
831 | /* The console is still frozen for suspend. */ | |
832 | if (ccw_device_force_console()) | |
833 | /* Forcing didn't work, no panic message .. */ | |
834 | return; | |
520a4e37 | 835 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 836 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 837 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
838 | } |
839 | ||
2332ce1a HS |
840 | static int con3215_notify(struct notifier_block *self, |
841 | unsigned long event, void *data) | |
842 | { | |
843 | con3215_flush(); | |
844 | return NOTIFY_OK; | |
845 | } | |
846 | ||
847 | static struct notifier_block on_panic_nb = { | |
848 | .notifier_call = con3215_notify, | |
849 | .priority = 0, | |
850 | }; | |
851 | ||
852 | static struct notifier_block on_reboot_nb = { | |
853 | .notifier_call = con3215_notify, | |
854 | .priority = 0, | |
855 | }; | |
856 | ||
1da177e4 LT |
857 | /* |
858 | * The console structure for the 3215 console | |
859 | */ | |
860 | static struct console con3215 = { | |
861 | .name = "ttyS", | |
862 | .write = con3215_write, | |
863 | .device = con3215_device, | |
1da177e4 LT |
864 | .flags = CON_PRINTBUFFER, |
865 | }; | |
866 | ||
867 | /* | |
868 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 869 | */ |
77812a27 | 870 | static int __init con3215_init(void) |
1da177e4 LT |
871 | { |
872 | struct ccw_device *cdev; | |
873 | struct raw3215_info *raw; | |
874 | struct raw3215_req *req; | |
875 | int i; | |
876 | ||
877 | /* Check if 3215 is to be the console */ | |
878 | if (!CONSOLE_IS_3215) | |
879 | return -ENODEV; | |
880 | ||
881 | /* Set the console mode for VM */ | |
882 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
883 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
884 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
885 | } |
886 | ||
887 | /* allocate 3215 request structures */ | |
888 | raw3215_freelist = NULL; | |
889 | spin_lock_init(&raw3215_freelist_lock); | |
890 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 891 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
892 | req->next = raw3215_freelist; |
893 | raw3215_freelist = req; | |
894 | } | |
895 | ||
896 | cdev = ccw_device_probe_console(); | |
600b5d16 | 897 | if (IS_ERR(cdev)) |
1da177e4 LT |
898 | return -ENODEV; |
899 | ||
900 | raw3215[0] = raw = (struct raw3215_info *) | |
6d56eee2 HC |
901 | kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); |
902 | raw->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
903 | raw->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
1da177e4 | 904 | raw->cdev = cdev; |
dff59b64 | 905 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
906 | cdev->handler = raw3215_irq; |
907 | ||
908 | raw->flags |= RAW3215_FIXED; | |
1da177e4 | 909 | init_waitqueue_head(&raw->empty_wait); |
656d9125 | 910 | tasklet_init(&raw->tlet, raw3215_wakeup, (unsigned long) raw); |
1da177e4 LT |
911 | |
912 | /* Request the console irq */ | |
913 | if (raw3215_startup(raw) != 0) { | |
6d56eee2 HC |
914 | kfree(raw->inbuf); |
915 | kfree(raw->buffer); | |
916 | kfree(raw); | |
1da177e4 | 917 | raw3215[0] = NULL; |
1da177e4 LT |
918 | return -ENODEV; |
919 | } | |
2332ce1a HS |
920 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
921 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
922 | register_console(&con3215); |
923 | return 0; | |
924 | } | |
925 | console_initcall(con3215_init); | |
926 | #endif | |
927 | ||
928 | /* | |
929 | * tty3215_open | |
930 | * | |
931 | * This routine is called whenever a 3215 tty is opened. | |
932 | */ | |
77812a27 | 933 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
934 | { |
935 | struct raw3215_info *raw; | |
936 | int retval, line; | |
937 | ||
938 | line = tty->index; | |
939 | if ((line < 0) || (line >= NR_3215)) | |
940 | return -ENODEV; | |
941 | ||
942 | raw = raw3215[line]; | |
943 | if (raw == NULL) | |
944 | return -ENODEV; | |
945 | ||
946 | tty->driver_data = raw; | |
947 | raw->tty = tty; | |
948 | ||
949 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
950 | /* | |
951 | * Start up 3215 device | |
952 | */ | |
953 | retval = raw3215_startup(raw); | |
954 | if (retval) | |
955 | return retval; | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | /* | |
961 | * tty3215_close() | |
962 | * | |
963 | * This routine is called when the 3215 tty is closed. We wait | |
964 | * for the remaining request to be completed. Then we clean up. | |
965 | */ | |
77812a27 | 966 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
967 | { |
968 | struct raw3215_info *raw; | |
969 | ||
970 | raw = (struct raw3215_info *) tty->driver_data; | |
971 | if (raw == NULL || tty->count > 1) | |
972 | return; | |
973 | tty->closing = 1; | |
974 | /* Shutdown the terminal */ | |
975 | raw3215_shutdown(raw); | |
656d9125 | 976 | tasklet_kill(&raw->tlet); |
1da177e4 LT |
977 | tty->closing = 0; |
978 | raw->tty = NULL; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Returns the amount of free space in the output buffer. | |
983 | */ | |
77812a27 | 984 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
985 | { |
986 | struct raw3215_info *raw; | |
987 | ||
988 | raw = (struct raw3215_info *) tty->driver_data; | |
989 | ||
990 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
991 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
992 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
993 | else | |
994 | return 0; | |
995 | } | |
996 | ||
997 | /* | |
998 | * String write routine for 3215 ttys | |
999 | */ | |
77812a27 MS |
1000 | static int tty3215_write(struct tty_struct * tty, |
1001 | const unsigned char *buf, int count) | |
1da177e4 LT |
1002 | { |
1003 | struct raw3215_info *raw; | |
1004 | ||
1005 | if (!tty) | |
1006 | return 0; | |
1007 | raw = (struct raw3215_info *) tty->driver_data; | |
1008 | raw3215_write(raw, buf, count); | |
1009 | return count; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Put character routine for 3215 ttys | |
1014 | */ | |
77812a27 | 1015 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1016 | { |
1017 | struct raw3215_info *raw; | |
1018 | ||
1019 | if (!tty) | |
9e7c9a19 | 1020 | return 0; |
1da177e4 LT |
1021 | raw = (struct raw3215_info *) tty->driver_data; |
1022 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1023 | return 1; |
1da177e4 LT |
1024 | } |
1025 | ||
77812a27 | 1026 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1027 | { |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Returns the number of characters in the output buffer | |
1032 | */ | |
77812a27 | 1033 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1034 | { |
1035 | struct raw3215_info *raw; | |
1036 | ||
1037 | raw = (struct raw3215_info *) tty->driver_data; | |
1038 | return raw->count; | |
1039 | } | |
1040 | ||
77812a27 | 1041 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1042 | { |
1043 | struct raw3215_info *raw; | |
1044 | ||
1045 | raw = (struct raw3215_info *) tty->driver_data; | |
1046 | raw3215_flush_buffer(raw); | |
1047 | tty_wakeup(tty); | |
1048 | } | |
1049 | ||
1da177e4 LT |
1050 | /* |
1051 | * Disable reading from a 3215 tty | |
1052 | */ | |
77812a27 | 1053 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1054 | { |
1055 | struct raw3215_info *raw; | |
1056 | ||
1057 | raw = (struct raw3215_info *) tty->driver_data; | |
1058 | raw->flags |= RAW3215_THROTTLED; | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Enable reading from a 3215 tty | |
1063 | */ | |
77812a27 | 1064 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1065 | { |
1066 | struct raw3215_info *raw; | |
1067 | unsigned long flags; | |
1068 | ||
1069 | raw = (struct raw3215_info *) tty->driver_data; | |
1070 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1071 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1072 | raw->flags &= ~RAW3215_THROTTLED; |
1073 | raw3215_try_io(raw); | |
520a4e37 | 1074 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1075 | } |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Disable writing to a 3215 tty | |
1080 | */ | |
77812a27 | 1081 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1082 | { |
1083 | struct raw3215_info *raw; | |
1084 | ||
1085 | raw = (struct raw3215_info *) tty->driver_data; | |
1086 | raw->flags |= RAW3215_STOPPED; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * Enable writing to a 3215 tty | |
1091 | */ | |
77812a27 | 1092 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1093 | { |
1094 | struct raw3215_info *raw; | |
1095 | unsigned long flags; | |
1096 | ||
1097 | raw = (struct raw3215_info *) tty->driver_data; | |
1098 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1099 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1100 | raw->flags &= ~RAW3215_STOPPED; |
1101 | raw3215_try_io(raw); | |
520a4e37 | 1102 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1103 | } |
1104 | } | |
1105 | ||
b68e31d0 | 1106 | static const struct tty_operations tty3215_ops = { |
1da177e4 LT |
1107 | .open = tty3215_open, |
1108 | .close = tty3215_close, | |
1109 | .write = tty3215_write, | |
1110 | .put_char = tty3215_put_char, | |
1111 | .flush_chars = tty3215_flush_chars, | |
1112 | .write_room = tty3215_write_room, | |
1113 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1114 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1115 | .throttle = tty3215_throttle, |
1116 | .unthrottle = tty3215_unthrottle, | |
1117 | .stop = tty3215_stop, | |
1118 | .start = tty3215_start, | |
1119 | }; | |
1120 | ||
1121 | /* | |
1122 | * 3215 tty registration code called from tty_init(). | |
1123 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1124 | */ | |
77812a27 | 1125 | static int __init tty3215_init(void) |
1da177e4 LT |
1126 | { |
1127 | struct tty_driver *driver; | |
1128 | int ret; | |
1129 | ||
1130 | if (!CONSOLE_IS_3215) | |
1131 | return 0; | |
1132 | ||
1133 | driver = alloc_tty_driver(NR_3215); | |
1134 | if (!driver) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1138 | if (ret) { | |
1139 | put_tty_driver(driver); | |
1140 | return ret; | |
1141 | } | |
1142 | /* | |
1143 | * Initialize the tty_driver structure | |
1144 | * Entries in tty3215_driver that are NOT initialized: | |
1145 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1146 | */ | |
1147 | ||
1148 | driver->owner = THIS_MODULE; | |
1149 | driver->driver_name = "tty3215"; | |
1150 | driver->name = "ttyS"; | |
1151 | driver->major = TTY_MAJOR; | |
1152 | driver->minor_start = 64; | |
1153 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1154 | driver->subtype = SYSTEM_TYPE_TTY; | |
1155 | driver->init_termios = tty_std_termios; | |
1156 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1157 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1158 | driver->init_termios.c_lflag = ISIG; | |
1159 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1160 | tty_set_operations(driver, &tty3215_ops); | |
1161 | ret = tty_register_driver(driver); | |
1162 | if (ret) { | |
1da177e4 LT |
1163 | put_tty_driver(driver); |
1164 | return ret; | |
1165 | } | |
1166 | tty3215_driver = driver; | |
1167 | return 0; | |
1168 | } | |
1169 | ||
77812a27 | 1170 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1171 | { |
1172 | tty_unregister_driver(tty3215_driver); | |
1173 | put_tty_driver(tty3215_driver); | |
1174 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1175 | } | |
1176 | ||
1177 | module_init(tty3215_init); | |
1178 | module_exit(tty3215_exit); |