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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> |
8dd360f0 | 23 | #include <linux/serial.h> /* ASYNC_* flags */ |
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 */ | |
1da177e4 LT |
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 */ | |
1da177e4 LT |
51 | #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ |
52 | #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ | |
53 | ||
54 | #define TAB_STOP_SIZE 8 /* tab stop size */ | |
55 | ||
56 | /* | |
57 | * Request types for a 3215 device | |
58 | */ | |
59 | enum raw3215_type { | |
60 | RAW3215_FREE, RAW3215_READ, RAW3215_WRITE | |
61 | }; | |
62 | ||
63 | /* | |
64 | * Request structure for a 3215 device | |
65 | */ | |
66 | struct raw3215_req { | |
67 | enum raw3215_type type; /* type of the request */ | |
68 | int start, len; /* start index & len in output buffer */ | |
69 | int delayable; /* indication to wait for more data */ | |
70 | int residual; /* residual count for read request */ | |
71 | struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ | |
72 | struct raw3215_info *info; /* pointer to main structure */ | |
73 | struct raw3215_req *next; /* pointer to next request */ | |
74 | } __attribute__ ((aligned(8))); | |
75 | ||
76 | struct raw3215_info { | |
8dd360f0 | 77 | struct tty_port port; |
1da177e4 LT |
78 | struct ccw_device *cdev; /* device for tty driver */ |
79 | spinlock_t *lock; /* pointer to irq lock */ | |
80 | int flags; /* state flags */ | |
81 | char *buffer; /* pointer to output buffer */ | |
82 | char *inbuf; /* pointer to input buffer */ | |
83 | int head; /* first free byte in output buffer */ | |
84 | int count; /* number of bytes in output buffer */ | |
85 | int written; /* number of bytes in write requests */ | |
86 | struct tty_struct *tty; /* pointer to tty structure if present */ | |
1da177e4 LT |
87 | struct raw3215_req *queued_read; /* pointer to queued read requests */ |
88 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
656d9125 | 89 | struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ |
1da177e4 LT |
90 | wait_queue_head_t empty_wait; /* wait queue for flushing */ |
91 | struct timer_list timer; /* timer for delayed output */ | |
1da177e4 LT |
92 | int line_pos; /* position on the line (for tabs) */ |
93 | char ubuffer[80]; /* copy_from_user buffer */ | |
94 | }; | |
95 | ||
96 | /* array of 3215 devices structures */ | |
97 | static struct raw3215_info *raw3215[NR_3215]; | |
98 | /* spinlock to protect the raw3215 array */ | |
99 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
100 | /* list of free request structures */ | |
101 | static struct raw3215_req *raw3215_freelist; | |
102 | /* spinlock to protect free list */ | |
103 | static spinlock_t raw3215_freelist_lock; | |
104 | ||
105 | static struct tty_driver *tty3215_driver; | |
106 | ||
107 | /* | |
108 | * Get a request structure from the free list | |
109 | */ | |
77812a27 MS |
110 | static inline struct raw3215_req *raw3215_alloc_req(void) |
111 | { | |
1da177e4 LT |
112 | struct raw3215_req *req; |
113 | unsigned long flags; | |
114 | ||
115 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
116 | req = raw3215_freelist; | |
117 | raw3215_freelist = req->next; | |
118 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
119 | return req; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Put a request structure back to the free list | |
124 | */ | |
77812a27 MS |
125 | static inline void raw3215_free_req(struct raw3215_req *req) |
126 | { | |
1da177e4 LT |
127 | unsigned long flags; |
128 | ||
129 | if (req->type == RAW3215_FREE) | |
130 | return; /* don't free a free request */ | |
131 | req->type = RAW3215_FREE; | |
132 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
133 | req->next = raw3215_freelist; | |
134 | raw3215_freelist = req; | |
135 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
136 | } | |
137 | ||
138 | /* | |
139 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
140 | * If there is a queued read request it is used, but that shouldn't happen | |
141 | * because a 3215 terminal won't accept a new read before the old one is | |
142 | * completed. | |
143 | */ | |
77812a27 | 144 | static void raw3215_mk_read_req(struct raw3215_info *raw) |
1da177e4 LT |
145 | { |
146 | struct raw3215_req *req; | |
147 | struct ccw1 *ccw; | |
148 | ||
149 | /* there can only be ONE read request at a time */ | |
150 | req = raw->queued_read; | |
151 | if (req == NULL) { | |
152 | /* no queued read request, use new req structure */ | |
153 | req = raw3215_alloc_req(); | |
154 | req->type = RAW3215_READ; | |
155 | req->info = raw; | |
156 | raw->queued_read = req; | |
157 | } | |
158 | ||
159 | ccw = req->ccws; | |
160 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
161 | ccw->flags = 0x20; /* ignore incorrect length */ | |
162 | ccw->count = 160; | |
163 | ccw->cda = (__u32) __pa(raw->inbuf); | |
164 | } | |
165 | ||
166 | /* | |
167 | * Set up a write request with the information from the main structure. | |
168 | * A ccw chain is created that writes as much as possible from the output | |
169 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
170 | * the new, probably lengthened request. | |
171 | */ | |
77812a27 | 172 | static void raw3215_mk_write_req(struct raw3215_info *raw) |
1da177e4 LT |
173 | { |
174 | struct raw3215_req *req; | |
175 | struct ccw1 *ccw; | |
176 | int len, count, ix, lines; | |
177 | ||
178 | if (raw->count <= raw->written) | |
179 | return; | |
180 | /* check if there is a queued write request */ | |
181 | req = raw->queued_write; | |
182 | if (req == NULL) { | |
183 | /* no queued write request, use new req structure */ | |
184 | req = raw3215_alloc_req(); | |
185 | req->type = RAW3215_WRITE; | |
186 | req->info = raw; | |
187 | raw->queued_write = req; | |
188 | } else { | |
189 | raw->written -= req->len; | |
190 | } | |
191 | ||
192 | ccw = req->ccws; | |
193 | req->start = (raw->head - raw->count + raw->written) & | |
194 | (RAW3215_BUFFER_SIZE - 1); | |
195 | /* | |
196 | * now we have to count newlines. We can at max accept | |
197 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
198 | * a restriction in VM | |
199 | */ | |
200 | lines = 0; | |
201 | ix = req->start; | |
202 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
203 | if (raw->buffer[ix] == 0x15) | |
204 | lines++; | |
205 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
206 | } | |
207 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
208 | if (len > RAW3215_MAX_BYTES) | |
209 | len = RAW3215_MAX_BYTES; | |
210 | req->len = len; | |
211 | raw->written += len; | |
212 | ||
213 | /* set the indication if we should try to enlarge this request */ | |
214 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
215 | ||
216 | ix = req->start; | |
217 | while (len > 0) { | |
218 | if (ccw > req->ccws) | |
219 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
220 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
221 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
222 | ccw->cda = | |
223 | (__u32) __pa(raw->buffer + ix); | |
224 | count = len; | |
225 | if (ix + count > RAW3215_BUFFER_SIZE) | |
226 | count = RAW3215_BUFFER_SIZE - ix; | |
227 | ccw->count = count; | |
228 | len -= count; | |
229 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
230 | ccw++; | |
231 | } | |
232 | /* | |
233 | * Add a NOP to the channel program. 3215 devices are purely | |
234 | * emulated and its much better to avoid the channel end | |
235 | * interrupt in this case. | |
236 | */ | |
237 | if (ccw > req->ccws) | |
238 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
239 | ccw->cmd_code = 0x03; /* NOP */ | |
240 | ccw->flags = 0; | |
241 | ccw->cda = 0; | |
242 | ccw->count = 1; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Start a read or a write request | |
247 | */ | |
77812a27 | 248 | static void raw3215_start_io(struct raw3215_info *raw) |
1da177e4 LT |
249 | { |
250 | struct raw3215_req *req; | |
251 | int res; | |
252 | ||
253 | req = raw->queued_read; | |
254 | if (req != NULL && | |
255 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
256 | /* dequeue request */ | |
257 | raw->queued_read = NULL; | |
258 | res = ccw_device_start(raw->cdev, req->ccws, | |
259 | (unsigned long) req, 0, 0); | |
260 | if (res != 0) { | |
261 | /* do_IO failed, put request back to queue */ | |
262 | raw->queued_read = req; | |
263 | } else { | |
264 | raw->flags |= RAW3215_WORKING; | |
265 | } | |
266 | } | |
267 | req = raw->queued_write; | |
268 | if (req != NULL && | |
269 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
270 | /* dequeue request */ | |
271 | raw->queued_write = NULL; | |
272 | res = ccw_device_start(raw->cdev, req->ccws, | |
273 | (unsigned long) req, 0, 0); | |
274 | if (res != 0) { | |
275 | /* do_IO failed, put request back to queue */ | |
276 | raw->queued_write = req; | |
277 | } else { | |
278 | raw->flags |= RAW3215_WORKING; | |
279 | } | |
280 | } | |
281 | } | |
282 | ||
283 | /* | |
284 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
285 | */ | |
77812a27 | 286 | static void raw3215_timeout(unsigned long __data) |
1da177e4 LT |
287 | { |
288 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
289 | unsigned long flags; | |
290 | ||
520a4e37 | 291 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
292 | if (raw->flags & RAW3215_TIMER_RUNS) { |
293 | del_timer(&raw->timer); | |
294 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
8dd360f0 | 295 | if (!(raw->port.flags & ASYNC_SUSPENDED)) { |
77812a27 MS |
296 | raw3215_mk_write_req(raw); |
297 | raw3215_start_io(raw); | |
298 | } | |
1da177e4 | 299 | } |
520a4e37 | 300 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
301 | } |
302 | ||
303 | /* | |
304 | * Function to conditionally start an IO. A read is started immediately, | |
305 | * a write is only started immediately if the flush flag is on or the | |
306 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
307 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
308 | */ | |
77812a27 | 309 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 310 | { |
8dd360f0 JS |
311 | if (!(raw->port.flags & ASYNC_INITIALIZED) || |
312 | (raw->port.flags & ASYNC_SUSPENDED)) | |
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 */ | |
1da177e4 | 327 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; |
1da177e4 LT |
328 | add_timer(&raw->timer); |
329 | raw->flags |= RAW3215_TIMER_RUNS; | |
330 | } | |
331 | } | |
332 | } | |
333 | ||
656d9125 MS |
334 | /* |
335 | * Call tty_wakeup from tasklet context | |
336 | */ | |
337 | static void raw3215_wakeup(unsigned long data) | |
338 | { | |
339 | struct raw3215_info *raw = (struct raw3215_info *) data; | |
340 | tty_wakeup(raw->tty); | |
341 | } | |
342 | ||
1da177e4 | 343 | /* |
408aec3c | 344 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 345 | */ |
408aec3c | 346 | static void raw3215_next_io(struct raw3215_info *raw) |
1da177e4 | 347 | { |
1da177e4 LT |
348 | raw3215_mk_write_req(raw); |
349 | raw3215_try_io(raw); | |
656d9125 MS |
350 | if (raw->tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) |
351 | tasklet_schedule(&raw->tlet); | |
1da177e4 LT |
352 | } |
353 | ||
354 | /* | |
355 | * Interrupt routine, called from common io layer | |
356 | */ | |
77812a27 MS |
357 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
358 | struct irb *irb) | |
1da177e4 LT |
359 | { |
360 | struct raw3215_info *raw; | |
361 | struct raw3215_req *req; | |
362 | struct tty_struct *tty; | |
363 | int cstat, dstat; | |
1d030370 | 364 | int count; |
1da177e4 | 365 | |
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. */ | |
8dd360f0 | 487 | if (raw->port.flags & ASYNC_SUSPENDED) { |
77812a27 MS |
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 | ||
8dd360f0 | 609 | if (raw->port.flags & ASYNC_INITIALIZED) |
1da177e4 LT |
610 | return 0; |
611 | raw->line_pos = 0; | |
8dd360f0 | 612 | raw->port.flags |= ASYNC_INITIALIZED; |
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 | ||
8dd360f0 JS |
628 | if (!(raw->port.flags & ASYNC_INITIALIZED) || |
629 | (raw->flags & RAW3215_FIXED)) | |
1da177e4 LT |
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) { | |
8dd360f0 | 636 | raw->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
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); | |
8dd360f0 | 644 | raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING); |
1da177e4 | 645 | } |
520a4e37 | 646 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
647 | } |
648 | ||
fe2fc9ca JS |
649 | static struct raw3215_info *raw3215_alloc_info(void) |
650 | { | |
651 | struct raw3215_info *info; | |
652 | ||
653 | info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); | |
654 | if (!info) | |
655 | return NULL; | |
656 | ||
657 | info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
658 | info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
659 | if (!info->buffer || !info->inbuf) { | |
660 | kfree(info); | |
661 | return NULL; | |
662 | } | |
663 | ||
664 | setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); | |
665 | init_waitqueue_head(&info->empty_wait); | |
666 | tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); | |
8dd360f0 | 667 | tty_port_init(&info->port); |
fe2fc9ca JS |
668 | |
669 | return info; | |
670 | } | |
671 | ||
672 | static void raw3215_free_info(struct raw3215_info *raw) | |
673 | { | |
674 | kfree(raw->inbuf); | |
675 | kfree(raw->buffer); | |
676 | kfree(raw); | |
677 | } | |
678 | ||
77812a27 | 679 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
680 | { |
681 | struct raw3215_info *raw; | |
682 | int line; | |
683 | ||
a2e53801 | 684 | /* Console is special. */ |
dff59b64 | 685 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 686 | return 0; |
fe2fc9ca JS |
687 | |
688 | raw = raw3215_alloc_info(); | |
1da177e4 LT |
689 | if (raw == NULL) |
690 | return -ENOMEM; | |
691 | ||
fe2fc9ca JS |
692 | raw->cdev = cdev; |
693 | dev_set_drvdata(&cdev->dev, raw); | |
694 | cdev->handler = raw3215_irq; | |
695 | ||
1da177e4 LT |
696 | spin_lock(&raw3215_device_lock); |
697 | for (line = 0; line < NR_3215; line++) { | |
698 | if (!raw3215[line]) { | |
699 | raw3215[line] = raw; | |
700 | break; | |
701 | } | |
702 | } | |
703 | spin_unlock(&raw3215_device_lock); | |
704 | if (line == NR_3215) { | |
fe2fc9ca | 705 | raw3215_free_info(raw); |
1da177e4 LT |
706 | return -ENODEV; |
707 | } | |
708 | ||
1da177e4 LT |
709 | return 0; |
710 | } | |
711 | ||
77812a27 | 712 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
713 | { |
714 | struct raw3215_info *raw; | |
715 | ||
716 | ccw_device_set_offline(cdev); | |
dff59b64 | 717 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 718 | if (raw) { |
dff59b64 | 719 | dev_set_drvdata(&cdev->dev, NULL); |
fe2fc9ca | 720 | raw3215_free_info(raw); |
1da177e4 LT |
721 | } |
722 | } | |
723 | ||
77812a27 | 724 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
725 | { |
726 | struct raw3215_info *raw; | |
727 | ||
dff59b64 | 728 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
729 | if (!raw) |
730 | return -ENODEV; | |
731 | ||
732 | return raw3215_startup(raw); | |
733 | } | |
734 | ||
77812a27 | 735 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
736 | { |
737 | struct raw3215_info *raw; | |
738 | ||
dff59b64 | 739 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
740 | if (!raw) |
741 | return -ENODEV; | |
742 | ||
743 | raw3215_shutdown(raw); | |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
77812a27 MS |
748 | static int raw3215_pm_stop(struct ccw_device *cdev) |
749 | { | |
750 | struct raw3215_info *raw; | |
751 | unsigned long flags; | |
752 | ||
753 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 754 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
755 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
756 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
8dd360f0 | 757 | raw->port.flags |= ASYNC_SUSPENDED; |
77812a27 MS |
758 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
759 | return 0; | |
760 | } | |
761 | ||
762 | static int raw3215_pm_start(struct ccw_device *cdev) | |
763 | { | |
764 | struct raw3215_info *raw; | |
765 | unsigned long flags; | |
766 | ||
767 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 768 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 | 769 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
8dd360f0 | 770 | raw->port.flags &= ~ASYNC_SUSPENDED; |
77812a27 MS |
771 | raw->flags |= RAW3215_FLUSHING; |
772 | raw3215_try_io(raw); | |
773 | raw->flags &= ~RAW3215_FLUSHING; | |
774 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
775 | return 0; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | static struct ccw_device_id raw3215_id[] = { |
779 | { CCW_DEVICE(0x3215, 0) }, | |
780 | { /* end of list */ }, | |
781 | }; | |
782 | ||
783 | static struct ccw_driver raw3215_ccw_driver = { | |
3bda058b SO |
784 | .driver = { |
785 | .name = "3215", | |
786 | .owner = THIS_MODULE, | |
787 | }, | |
1da177e4 LT |
788 | .ids = raw3215_id, |
789 | .probe = &raw3215_probe, | |
790 | .remove = &raw3215_remove, | |
791 | .set_online = &raw3215_set_online, | |
792 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
793 | .freeze = &raw3215_pm_stop, |
794 | .thaw = &raw3215_pm_start, | |
795 | .restore = &raw3215_pm_start, | |
de400d6b | 796 | .int_class = IOINT_C15, |
1da177e4 LT |
797 | }; |
798 | ||
799 | #ifdef CONFIG_TN3215_CONSOLE | |
800 | /* | |
801 | * Write a string to the 3215 console | |
802 | */ | |
77812a27 MS |
803 | static void con3215_write(struct console *co, const char *str, |
804 | unsigned int count) | |
1da177e4 LT |
805 | { |
806 | struct raw3215_info *raw; | |
807 | int i; | |
808 | ||
809 | if (count <= 0) | |
810 | return; | |
811 | raw = raw3215[0]; /* console 3215 is the first one */ | |
812 | while (count > 0) { | |
813 | for (i = 0; i < count; i++) | |
814 | if (str[i] == '\t' || str[i] == '\n') | |
815 | break; | |
816 | raw3215_write(raw, str, i); | |
817 | count -= i; | |
818 | str += i; | |
819 | if (count > 0) { | |
820 | raw3215_putchar(raw, *str); | |
821 | count--; | |
822 | str++; | |
823 | } | |
824 | } | |
825 | } | |
826 | ||
827 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
828 | { | |
829 | *index = c->index; | |
830 | return tty3215_driver; | |
831 | } | |
832 | ||
833 | /* | |
2332ce1a HS |
834 | * panic() calls con3215_flush through a panic_notifier |
835 | * before the system enters a disabled, endless loop. | |
1da177e4 | 836 | */ |
77812a27 | 837 | static void con3215_flush(void) |
1da177e4 LT |
838 | { |
839 | struct raw3215_info *raw; | |
840 | unsigned long flags; | |
841 | ||
842 | raw = raw3215[0]; /* console 3215 is the first one */ | |
8dd360f0 | 843 | if (raw->port.flags & ASYNC_SUSPENDED) |
77812a27 MS |
844 | /* The console is still frozen for suspend. */ |
845 | if (ccw_device_force_console()) | |
846 | /* Forcing didn't work, no panic message .. */ | |
847 | return; | |
520a4e37 | 848 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 849 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 850 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
851 | } |
852 | ||
2332ce1a HS |
853 | static int con3215_notify(struct notifier_block *self, |
854 | unsigned long event, void *data) | |
855 | { | |
856 | con3215_flush(); | |
857 | return NOTIFY_OK; | |
858 | } | |
859 | ||
860 | static struct notifier_block on_panic_nb = { | |
861 | .notifier_call = con3215_notify, | |
862 | .priority = 0, | |
863 | }; | |
864 | ||
865 | static struct notifier_block on_reboot_nb = { | |
866 | .notifier_call = con3215_notify, | |
867 | .priority = 0, | |
868 | }; | |
869 | ||
1da177e4 LT |
870 | /* |
871 | * The console structure for the 3215 console | |
872 | */ | |
873 | static struct console con3215 = { | |
874 | .name = "ttyS", | |
875 | .write = con3215_write, | |
876 | .device = con3215_device, | |
1da177e4 LT |
877 | .flags = CON_PRINTBUFFER, |
878 | }; | |
879 | ||
880 | /* | |
881 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 882 | */ |
77812a27 | 883 | static int __init con3215_init(void) |
1da177e4 LT |
884 | { |
885 | struct ccw_device *cdev; | |
886 | struct raw3215_info *raw; | |
887 | struct raw3215_req *req; | |
888 | int i; | |
889 | ||
890 | /* Check if 3215 is to be the console */ | |
891 | if (!CONSOLE_IS_3215) | |
892 | return -ENODEV; | |
893 | ||
894 | /* Set the console mode for VM */ | |
895 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
896 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
897 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
898 | } |
899 | ||
900 | /* allocate 3215 request structures */ | |
901 | raw3215_freelist = NULL; | |
902 | spin_lock_init(&raw3215_freelist_lock); | |
903 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 904 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
905 | req->next = raw3215_freelist; |
906 | raw3215_freelist = req; | |
907 | } | |
908 | ||
909 | cdev = ccw_device_probe_console(); | |
600b5d16 | 910 | if (IS_ERR(cdev)) |
1da177e4 LT |
911 | return -ENODEV; |
912 | ||
fe2fc9ca | 913 | raw3215[0] = raw = raw3215_alloc_info(); |
1da177e4 | 914 | raw->cdev = cdev; |
dff59b64 | 915 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
916 | cdev->handler = raw3215_irq; |
917 | ||
918 | raw->flags |= RAW3215_FIXED; | |
1da177e4 LT |
919 | |
920 | /* Request the console irq */ | |
921 | if (raw3215_startup(raw) != 0) { | |
fe2fc9ca | 922 | raw3215_free_info(raw); |
1da177e4 | 923 | raw3215[0] = NULL; |
1da177e4 LT |
924 | return -ENODEV; |
925 | } | |
2332ce1a HS |
926 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
927 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
928 | register_console(&con3215); |
929 | return 0; | |
930 | } | |
931 | console_initcall(con3215_init); | |
932 | #endif | |
933 | ||
934 | /* | |
935 | * tty3215_open | |
936 | * | |
937 | * This routine is called whenever a 3215 tty is opened. | |
938 | */ | |
77812a27 | 939 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
940 | { |
941 | struct raw3215_info *raw; | |
410235fd | 942 | int retval; |
1da177e4 | 943 | |
410235fd | 944 | raw = raw3215[tty->index]; |
1da177e4 LT |
945 | if (raw == NULL) |
946 | return -ENODEV; | |
947 | ||
948 | tty->driver_data = raw; | |
949 | raw->tty = tty; | |
950 | ||
951 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
952 | /* | |
953 | * Start up 3215 device | |
954 | */ | |
955 | retval = raw3215_startup(raw); | |
956 | if (retval) | |
957 | return retval; | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | /* | |
963 | * tty3215_close() | |
964 | * | |
965 | * This routine is called when the 3215 tty is closed. We wait | |
966 | * for the remaining request to be completed. Then we clean up. | |
967 | */ | |
77812a27 | 968 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
969 | { |
970 | struct raw3215_info *raw; | |
971 | ||
972 | raw = (struct raw3215_info *) tty->driver_data; | |
973 | if (raw == NULL || tty->count > 1) | |
974 | return; | |
975 | tty->closing = 1; | |
976 | /* Shutdown the terminal */ | |
977 | raw3215_shutdown(raw); | |
656d9125 | 978 | tasklet_kill(&raw->tlet); |
1da177e4 LT |
979 | tty->closing = 0; |
980 | raw->tty = NULL; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Returns the amount of free space in the output buffer. | |
985 | */ | |
77812a27 | 986 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
987 | { |
988 | struct raw3215_info *raw; | |
989 | ||
990 | raw = (struct raw3215_info *) tty->driver_data; | |
991 | ||
992 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
993 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
994 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
995 | else | |
996 | return 0; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * String write routine for 3215 ttys | |
1001 | */ | |
77812a27 MS |
1002 | static int tty3215_write(struct tty_struct * tty, |
1003 | const unsigned char *buf, int count) | |
1da177e4 LT |
1004 | { |
1005 | struct raw3215_info *raw; | |
1006 | ||
1007 | if (!tty) | |
1008 | return 0; | |
1009 | raw = (struct raw3215_info *) tty->driver_data; | |
1010 | raw3215_write(raw, buf, count); | |
1011 | return count; | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * Put character routine for 3215 ttys | |
1016 | */ | |
77812a27 | 1017 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1018 | { |
1019 | struct raw3215_info *raw; | |
1020 | ||
1021 | if (!tty) | |
9e7c9a19 | 1022 | return 0; |
1da177e4 LT |
1023 | raw = (struct raw3215_info *) tty->driver_data; |
1024 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1025 | return 1; |
1da177e4 LT |
1026 | } |
1027 | ||
77812a27 | 1028 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1029 | { |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Returns the number of characters in the output buffer | |
1034 | */ | |
77812a27 | 1035 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1036 | { |
1037 | struct raw3215_info *raw; | |
1038 | ||
1039 | raw = (struct raw3215_info *) tty->driver_data; | |
1040 | return raw->count; | |
1041 | } | |
1042 | ||
77812a27 | 1043 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1044 | { |
1045 | struct raw3215_info *raw; | |
1046 | ||
1047 | raw = (struct raw3215_info *) tty->driver_data; | |
1048 | raw3215_flush_buffer(raw); | |
1049 | tty_wakeup(tty); | |
1050 | } | |
1051 | ||
1da177e4 LT |
1052 | /* |
1053 | * Disable reading from a 3215 tty | |
1054 | */ | |
77812a27 | 1055 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1056 | { |
1057 | struct raw3215_info *raw; | |
1058 | ||
1059 | raw = (struct raw3215_info *) tty->driver_data; | |
1060 | raw->flags |= RAW3215_THROTTLED; | |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * Enable reading from a 3215 tty | |
1065 | */ | |
77812a27 | 1066 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1067 | { |
1068 | struct raw3215_info *raw; | |
1069 | unsigned long flags; | |
1070 | ||
1071 | raw = (struct raw3215_info *) tty->driver_data; | |
1072 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1073 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1074 | raw->flags &= ~RAW3215_THROTTLED; |
1075 | raw3215_try_io(raw); | |
520a4e37 | 1076 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1077 | } |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Disable writing to a 3215 tty | |
1082 | */ | |
77812a27 | 1083 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1084 | { |
1085 | struct raw3215_info *raw; | |
1086 | ||
1087 | raw = (struct raw3215_info *) tty->driver_data; | |
1088 | raw->flags |= RAW3215_STOPPED; | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * Enable writing to a 3215 tty | |
1093 | */ | |
77812a27 | 1094 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1095 | { |
1096 | struct raw3215_info *raw; | |
1097 | unsigned long flags; | |
1098 | ||
1099 | raw = (struct raw3215_info *) tty->driver_data; | |
1100 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1101 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1102 | raw->flags &= ~RAW3215_STOPPED; |
1103 | raw3215_try_io(raw); | |
520a4e37 | 1104 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1105 | } |
1106 | } | |
1107 | ||
b68e31d0 | 1108 | static const struct tty_operations tty3215_ops = { |
1da177e4 LT |
1109 | .open = tty3215_open, |
1110 | .close = tty3215_close, | |
1111 | .write = tty3215_write, | |
1112 | .put_char = tty3215_put_char, | |
1113 | .flush_chars = tty3215_flush_chars, | |
1114 | .write_room = tty3215_write_room, | |
1115 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1116 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1117 | .throttle = tty3215_throttle, |
1118 | .unthrottle = tty3215_unthrottle, | |
1119 | .stop = tty3215_stop, | |
1120 | .start = tty3215_start, | |
1121 | }; | |
1122 | ||
1123 | /* | |
1124 | * 3215 tty registration code called from tty_init(). | |
1125 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1126 | */ | |
77812a27 | 1127 | static int __init tty3215_init(void) |
1da177e4 LT |
1128 | { |
1129 | struct tty_driver *driver; | |
1130 | int ret; | |
1131 | ||
1132 | if (!CONSOLE_IS_3215) | |
1133 | return 0; | |
1134 | ||
1135 | driver = alloc_tty_driver(NR_3215); | |
1136 | if (!driver) | |
1137 | return -ENOMEM; | |
1138 | ||
1139 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1140 | if (ret) { | |
1141 | put_tty_driver(driver); | |
1142 | return ret; | |
1143 | } | |
1144 | /* | |
1145 | * Initialize the tty_driver structure | |
1146 | * Entries in tty3215_driver that are NOT initialized: | |
1147 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1148 | */ | |
1149 | ||
1da177e4 LT |
1150 | driver->driver_name = "tty3215"; |
1151 | driver->name = "ttyS"; | |
1152 | driver->major = TTY_MAJOR; | |
1153 | driver->minor_start = 64; | |
1154 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1155 | driver->subtype = SYSTEM_TYPE_TTY; | |
1156 | driver->init_termios = tty_std_termios; | |
1157 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1158 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1159 | driver->init_termios.c_lflag = ISIG; | |
1160 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1161 | tty_set_operations(driver, &tty3215_ops); | |
1162 | ret = tty_register_driver(driver); | |
1163 | if (ret) { | |
1da177e4 LT |
1164 | put_tty_driver(driver); |
1165 | return ret; | |
1166 | } | |
1167 | tty3215_driver = driver; | |
1168 | return 0; | |
1169 | } | |
1170 | ||
77812a27 | 1171 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1172 | { |
1173 | tty_unregister_driver(tty3215_driver); | |
1174 | put_tty_driver(tty3215_driver); | |
1175 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1176 | } | |
1177 | ||
1178 | module_init(tty3215_init); | |
1179 | module_exit(tty3215_exit); |