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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 */ | |
1da177e4 LT |
86 | struct raw3215_req *queued_read; /* pointer to queued read requests */ |
87 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
656d9125 | 88 | struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ |
1da177e4 LT |
89 | wait_queue_head_t empty_wait; /* wait queue for flushing */ |
90 | struct timer_list timer; /* timer for delayed output */ | |
1da177e4 LT |
91 | int line_pos; /* position on the line (for tabs) */ |
92 | char ubuffer[80]; /* copy_from_user buffer */ | |
93 | }; | |
94 | ||
95 | /* array of 3215 devices structures */ | |
96 | static struct raw3215_info *raw3215[NR_3215]; | |
97 | /* spinlock to protect the raw3215 array */ | |
98 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
99 | /* list of free request structures */ | |
100 | static struct raw3215_req *raw3215_freelist; | |
101 | /* spinlock to protect free list */ | |
102 | static spinlock_t raw3215_freelist_lock; | |
103 | ||
104 | static struct tty_driver *tty3215_driver; | |
105 | ||
106 | /* | |
107 | * Get a request structure from the free list | |
108 | */ | |
77812a27 MS |
109 | static inline struct raw3215_req *raw3215_alloc_req(void) |
110 | { | |
1da177e4 LT |
111 | struct raw3215_req *req; |
112 | unsigned long flags; | |
113 | ||
114 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
115 | req = raw3215_freelist; | |
116 | raw3215_freelist = req->next; | |
117 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
118 | return req; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Put a request structure back to the free list | |
123 | */ | |
77812a27 MS |
124 | static inline void raw3215_free_req(struct raw3215_req *req) |
125 | { | |
1da177e4 LT |
126 | unsigned long flags; |
127 | ||
128 | if (req->type == RAW3215_FREE) | |
129 | return; /* don't free a free request */ | |
130 | req->type = RAW3215_FREE; | |
131 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
132 | req->next = raw3215_freelist; | |
133 | raw3215_freelist = req; | |
134 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
135 | } | |
136 | ||
137 | /* | |
138 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
139 | * If there is a queued read request it is used, but that shouldn't happen | |
140 | * because a 3215 terminal won't accept a new read before the old one is | |
141 | * completed. | |
142 | */ | |
77812a27 | 143 | static void raw3215_mk_read_req(struct raw3215_info *raw) |
1da177e4 LT |
144 | { |
145 | struct raw3215_req *req; | |
146 | struct ccw1 *ccw; | |
147 | ||
148 | /* there can only be ONE read request at a time */ | |
149 | req = raw->queued_read; | |
150 | if (req == NULL) { | |
151 | /* no queued read request, use new req structure */ | |
152 | req = raw3215_alloc_req(); | |
153 | req->type = RAW3215_READ; | |
154 | req->info = raw; | |
155 | raw->queued_read = req; | |
156 | } | |
157 | ||
158 | ccw = req->ccws; | |
159 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
160 | ccw->flags = 0x20; /* ignore incorrect length */ | |
161 | ccw->count = 160; | |
162 | ccw->cda = (__u32) __pa(raw->inbuf); | |
163 | } | |
164 | ||
165 | /* | |
166 | * Set up a write request with the information from the main structure. | |
167 | * A ccw chain is created that writes as much as possible from the output | |
168 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
169 | * the new, probably lengthened request. | |
170 | */ | |
77812a27 | 171 | static void raw3215_mk_write_req(struct raw3215_info *raw) |
1da177e4 LT |
172 | { |
173 | struct raw3215_req *req; | |
174 | struct ccw1 *ccw; | |
175 | int len, count, ix, lines; | |
176 | ||
177 | if (raw->count <= raw->written) | |
178 | return; | |
179 | /* check if there is a queued write request */ | |
180 | req = raw->queued_write; | |
181 | if (req == NULL) { | |
182 | /* no queued write request, use new req structure */ | |
183 | req = raw3215_alloc_req(); | |
184 | req->type = RAW3215_WRITE; | |
185 | req->info = raw; | |
186 | raw->queued_write = req; | |
187 | } else { | |
188 | raw->written -= req->len; | |
189 | } | |
190 | ||
191 | ccw = req->ccws; | |
192 | req->start = (raw->head - raw->count + raw->written) & | |
193 | (RAW3215_BUFFER_SIZE - 1); | |
194 | /* | |
195 | * now we have to count newlines. We can at max accept | |
196 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
197 | * a restriction in VM | |
198 | */ | |
199 | lines = 0; | |
200 | ix = req->start; | |
201 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
202 | if (raw->buffer[ix] == 0x15) | |
203 | lines++; | |
204 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
205 | } | |
206 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
207 | if (len > RAW3215_MAX_BYTES) | |
208 | len = RAW3215_MAX_BYTES; | |
209 | req->len = len; | |
210 | raw->written += len; | |
211 | ||
212 | /* set the indication if we should try to enlarge this request */ | |
213 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
214 | ||
215 | ix = req->start; | |
216 | while (len > 0) { | |
217 | if (ccw > req->ccws) | |
218 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
219 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
220 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
221 | ccw->cda = | |
222 | (__u32) __pa(raw->buffer + ix); | |
223 | count = len; | |
224 | if (ix + count > RAW3215_BUFFER_SIZE) | |
225 | count = RAW3215_BUFFER_SIZE - ix; | |
226 | ccw->count = count; | |
227 | len -= count; | |
228 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
229 | ccw++; | |
230 | } | |
231 | /* | |
232 | * Add a NOP to the channel program. 3215 devices are purely | |
233 | * emulated and its much better to avoid the channel end | |
234 | * interrupt in this case. | |
235 | */ | |
236 | if (ccw > req->ccws) | |
237 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
238 | ccw->cmd_code = 0x03; /* NOP */ | |
239 | ccw->flags = 0; | |
240 | ccw->cda = 0; | |
241 | ccw->count = 1; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Start a read or a write request | |
246 | */ | |
77812a27 | 247 | static void raw3215_start_io(struct raw3215_info *raw) |
1da177e4 LT |
248 | { |
249 | struct raw3215_req *req; | |
250 | int res; | |
251 | ||
252 | req = raw->queued_read; | |
253 | if (req != NULL && | |
254 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
255 | /* dequeue request */ | |
256 | raw->queued_read = NULL; | |
257 | res = ccw_device_start(raw->cdev, req->ccws, | |
258 | (unsigned long) req, 0, 0); | |
259 | if (res != 0) { | |
260 | /* do_IO failed, put request back to queue */ | |
261 | raw->queued_read = req; | |
262 | } else { | |
263 | raw->flags |= RAW3215_WORKING; | |
264 | } | |
265 | } | |
266 | req = raw->queued_write; | |
267 | if (req != NULL && | |
268 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
269 | /* dequeue request */ | |
270 | raw->queued_write = NULL; | |
271 | res = ccw_device_start(raw->cdev, req->ccws, | |
272 | (unsigned long) req, 0, 0); | |
273 | if (res != 0) { | |
274 | /* do_IO failed, put request back to queue */ | |
275 | raw->queued_write = req; | |
276 | } else { | |
277 | raw->flags |= RAW3215_WORKING; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | /* | |
283 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
284 | */ | |
77812a27 | 285 | static void raw3215_timeout(unsigned long __data) |
1da177e4 LT |
286 | { |
287 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
288 | unsigned long flags; | |
289 | ||
520a4e37 | 290 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
291 | if (raw->flags & RAW3215_TIMER_RUNS) { |
292 | del_timer(&raw->timer); | |
293 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
8dd360f0 | 294 | if (!(raw->port.flags & ASYNC_SUSPENDED)) { |
77812a27 MS |
295 | raw3215_mk_write_req(raw); |
296 | raw3215_start_io(raw); | |
297 | } | |
1da177e4 | 298 | } |
520a4e37 | 299 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
300 | } |
301 | ||
302 | /* | |
303 | * Function to conditionally start an IO. A read is started immediately, | |
304 | * a write is only started immediately if the flush flag is on or the | |
305 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
306 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
307 | */ | |
77812a27 | 308 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 309 | { |
8dd360f0 JS |
310 | if (!(raw->port.flags & ASYNC_INITIALIZED) || |
311 | (raw->port.flags & ASYNC_SUSPENDED)) | |
1da177e4 LT |
312 | return; |
313 | if (raw->queued_read != NULL) | |
314 | raw3215_start_io(raw); | |
315 | else if (raw->queued_write != NULL) { | |
316 | if ((raw->queued_write->delayable == 0) || | |
317 | (raw->flags & RAW3215_FLUSHING)) { | |
318 | /* execute write requests bigger than minimum size */ | |
319 | raw3215_start_io(raw); | |
320 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
321 | del_timer(&raw->timer); | |
322 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
323 | } | |
324 | } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { | |
325 | /* delay small writes */ | |
1da177e4 | 326 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; |
1da177e4 LT |
327 | add_timer(&raw->timer); |
328 | raw->flags |= RAW3215_TIMER_RUNS; | |
329 | } | |
330 | } | |
331 | } | |
332 | ||
656d9125 MS |
333 | /* |
334 | * Call tty_wakeup from tasklet context | |
335 | */ | |
336 | static void raw3215_wakeup(unsigned long data) | |
337 | { | |
338 | struct raw3215_info *raw = (struct raw3215_info *) data; | |
e695b286 HC |
339 | struct tty_struct *tty; |
340 | ||
341 | tty = tty_port_tty_get(&raw->port); | |
342 | tty_wakeup(tty); | |
343 | tty_kref_put(tty); | |
656d9125 MS |
344 | } |
345 | ||
1da177e4 | 346 | /* |
408aec3c | 347 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 348 | */ |
86b26007 | 349 | static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) |
1da177e4 | 350 | { |
1da177e4 LT |
351 | raw3215_mk_write_req(raw); |
352 | raw3215_try_io(raw); | |
86b26007 | 353 | if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) |
656d9125 | 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; |
86b26007 | 371 | tty = tty_port_tty_get(&raw->port); |
23d805b6 PO |
372 | cstat = irb->scsw.cmd.cstat; |
373 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 374 | if (cstat != 0) |
86b26007 | 375 | raw3215_next_io(raw, tty); |
1da177e4 LT |
376 | if (dstat & 0x01) { /* we got a unit exception */ |
377 | dstat &= ~0x01; /* we can ignore it */ | |
378 | } | |
379 | switch (dstat) { | |
380 | case 0x80: | |
381 | if (cstat != 0) | |
382 | break; | |
383 | /* Attention interrupt, someone hit the enter key */ | |
384 | raw3215_mk_read_req(raw); | |
86b26007 | 385 | raw3215_next_io(raw, tty); |
1da177e4 LT |
386 | break; |
387 | case 0x08: | |
388 | case 0x0C: | |
389 | /* Channel end interrupt. */ | |
390 | if ((raw = req->info) == NULL) | |
86b26007 | 391 | goto put_tty; /* That shouldn't happen ... */ |
1da177e4 LT |
392 | if (req->type == RAW3215_READ) { |
393 | /* store residual count, then wait for device end */ | |
23d805b6 | 394 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
395 | } |
396 | if (dstat == 0x08) | |
397 | break; | |
398 | case 0x04: | |
399 | /* Device end interrupt. */ | |
400 | if ((raw = req->info) == NULL) | |
86b26007 JS |
401 | goto put_tty; /* That shouldn't happen ... */ |
402 | if (req->type == RAW3215_READ && tty != NULL) { | |
1da177e4 LT |
403 | unsigned int cchar; |
404 | ||
1da177e4 | 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); |
86b26007 | 414 | tty_flip_buffer_push(tty); |
1da177e4 LT |
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); | |
86b26007 | 427 | tty_flip_buffer_push(tty); |
1da177e4 LT |
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 | } | |
86b26007 | 442 | raw3215_next_io(raw, tty); |
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 | } | |
86b26007 | 454 | raw3215_next_io(raw, tty); |
1da177e4 | 455 | } |
86b26007 JS |
456 | put_tty: |
457 | tty_kref_put(tty); | |
1da177e4 LT |
458 | } |
459 | ||
77812a27 MS |
460 | /* |
461 | * Drop the oldest line from the output buffer. | |
462 | */ | |
463 | static void raw3215_drop_line(struct raw3215_info *raw) | |
464 | { | |
465 | int ix; | |
466 | char ch; | |
467 | ||
468 | BUG_ON(raw->written != 0); | |
469 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
470 | while (raw->count > 0) { | |
471 | ch = raw->buffer[ix]; | |
472 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
473 | raw->count--; | |
474 | if (ch == 0x15) | |
475 | break; | |
476 | } | |
477 | raw->head = ix; | |
478 | } | |
479 | ||
1da177e4 LT |
480 | /* |
481 | * Wait until length bytes are available int the output buffer. | |
482 | * Has to be called with the s390irq lock held. Can be called | |
483 | * disabled. | |
484 | */ | |
77812a27 | 485 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
486 | { |
487 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
488 | /* While console is frozen for suspend we have no other |
489 | * choice but to drop message from the buffer to make | |
490 | * room for even more messages. */ | |
8dd360f0 | 491 | if (raw->port.flags & ASYNC_SUSPENDED) { |
77812a27 MS |
492 | raw3215_drop_line(raw); |
493 | continue; | |
494 | } | |
1da177e4 LT |
495 | /* there might be a request pending */ |
496 | raw->flags |= RAW3215_FLUSHING; | |
497 | raw3215_mk_write_req(raw); | |
498 | raw3215_try_io(raw); | |
499 | raw->flags &= ~RAW3215_FLUSHING; | |
500 | #ifdef CONFIG_TN3215_CONSOLE | |
501 | wait_cons_dev(); | |
502 | #endif | |
503 | /* Enough room freed up ? */ | |
504 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
505 | break; | |
506 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 507 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 508 | udelay(100); |
520a4e37 | 509 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
510 | } |
511 | } | |
512 | ||
513 | /* | |
514 | * String write routine for 3215 devices | |
515 | */ | |
77812a27 MS |
516 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
517 | unsigned int length) | |
1da177e4 LT |
518 | { |
519 | unsigned long flags; | |
520 | int c, count; | |
521 | ||
522 | while (length > 0) { | |
520a4e37 | 523 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
524 | count = (length > RAW3215_BUFFER_SIZE) ? |
525 | RAW3215_BUFFER_SIZE : length; | |
526 | length -= count; | |
527 | ||
528 | raw3215_make_room(raw, count); | |
529 | ||
530 | /* copy string to output buffer and convert it to EBCDIC */ | |
531 | while (1) { | |
532 | c = min_t(int, count, | |
533 | min(RAW3215_BUFFER_SIZE - raw->count, | |
534 | RAW3215_BUFFER_SIZE - raw->head)); | |
535 | if (c <= 0) | |
536 | break; | |
537 | memcpy(raw->buffer + raw->head, str, c); | |
538 | ASCEBC(raw->buffer + raw->head, c); | |
539 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
540 | raw->count += c; | |
541 | raw->line_pos += c; | |
542 | str += c; | |
543 | count -= c; | |
544 | } | |
545 | if (!(raw->flags & RAW3215_WORKING)) { | |
546 | raw3215_mk_write_req(raw); | |
547 | /* start or queue request */ | |
548 | raw3215_try_io(raw); | |
549 | } | |
520a4e37 | 550 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
551 | } |
552 | } | |
553 | ||
554 | /* | |
555 | * Put character routine for 3215 devices | |
556 | */ | |
77812a27 | 557 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
558 | { |
559 | unsigned long flags; | |
560 | unsigned int length, i; | |
561 | ||
520a4e37 | 562 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
563 | if (ch == '\t') { |
564 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
565 | raw->line_pos += length; | |
566 | ch = ' '; | |
567 | } else if (ch == '\n') { | |
568 | length = 1; | |
569 | raw->line_pos = 0; | |
570 | } else { | |
571 | length = 1; | |
572 | raw->line_pos++; | |
573 | } | |
574 | raw3215_make_room(raw, length); | |
575 | ||
576 | for (i = 0; i < length; i++) { | |
577 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
578 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
579 | raw->count++; | |
580 | } | |
581 | if (!(raw->flags & RAW3215_WORKING)) { | |
582 | raw3215_mk_write_req(raw); | |
583 | /* start or queue request */ | |
584 | raw3215_try_io(raw); | |
585 | } | |
520a4e37 | 586 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
587 | } |
588 | ||
589 | /* | |
590 | * Flush routine, it simply sets the flush flag and tries to start | |
591 | * pending IO. | |
592 | */ | |
77812a27 | 593 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
594 | { |
595 | unsigned long flags; | |
596 | ||
520a4e37 | 597 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
598 | if (raw->count > 0) { |
599 | raw->flags |= RAW3215_FLUSHING; | |
600 | raw3215_try_io(raw); | |
601 | raw->flags &= ~RAW3215_FLUSHING; | |
602 | } | |
520a4e37 | 603 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
604 | } |
605 | ||
606 | /* | |
607 | * Fire up a 3215 device. | |
608 | */ | |
77812a27 | 609 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
610 | { |
611 | unsigned long flags; | |
612 | ||
8dd360f0 | 613 | if (raw->port.flags & ASYNC_INITIALIZED) |
1da177e4 LT |
614 | return 0; |
615 | raw->line_pos = 0; | |
8dd360f0 | 616 | raw->port.flags |= ASYNC_INITIALIZED; |
520a4e37 | 617 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 618 | raw3215_try_io(raw); |
520a4e37 | 619 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
620 | |
621 | return 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Shutdown a 3215 device. | |
626 | */ | |
77812a27 | 627 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
628 | { |
629 | DECLARE_WAITQUEUE(wait, current); | |
630 | unsigned long flags; | |
631 | ||
8dd360f0 JS |
632 | if (!(raw->port.flags & ASYNC_INITIALIZED) || |
633 | (raw->flags & RAW3215_FIXED)) | |
1da177e4 LT |
634 | return; |
635 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 636 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
637 | if ((raw->flags & RAW3215_WORKING) || |
638 | raw->queued_write != NULL || | |
639 | raw->queued_read != NULL) { | |
8dd360f0 | 640 | raw->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
641 | add_wait_queue(&raw->empty_wait, &wait); |
642 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 643 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 644 | schedule(); |
520a4e37 | 645 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
646 | remove_wait_queue(&raw->empty_wait, &wait); |
647 | set_current_state(TASK_RUNNING); | |
8dd360f0 | 648 | raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING); |
1da177e4 | 649 | } |
520a4e37 | 650 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
651 | } |
652 | ||
fe2fc9ca JS |
653 | static struct raw3215_info *raw3215_alloc_info(void) |
654 | { | |
655 | struct raw3215_info *info; | |
656 | ||
657 | info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); | |
658 | if (!info) | |
659 | return NULL; | |
660 | ||
661 | info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
662 | info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
663 | if (!info->buffer || !info->inbuf) { | |
664 | kfree(info); | |
665 | return NULL; | |
666 | } | |
667 | ||
668 | setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); | |
669 | init_waitqueue_head(&info->empty_wait); | |
670 | tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); | |
8dd360f0 | 671 | tty_port_init(&info->port); |
fe2fc9ca JS |
672 | |
673 | return info; | |
674 | } | |
675 | ||
676 | static void raw3215_free_info(struct raw3215_info *raw) | |
677 | { | |
678 | kfree(raw->inbuf); | |
679 | kfree(raw->buffer); | |
680 | kfree(raw); | |
681 | } | |
682 | ||
77812a27 | 683 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
684 | { |
685 | struct raw3215_info *raw; | |
686 | int line; | |
687 | ||
a2e53801 | 688 | /* Console is special. */ |
dff59b64 | 689 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 690 | return 0; |
fe2fc9ca JS |
691 | |
692 | raw = raw3215_alloc_info(); | |
1da177e4 LT |
693 | if (raw == NULL) |
694 | return -ENOMEM; | |
695 | ||
fe2fc9ca JS |
696 | raw->cdev = cdev; |
697 | dev_set_drvdata(&cdev->dev, raw); | |
698 | cdev->handler = raw3215_irq; | |
699 | ||
1da177e4 LT |
700 | spin_lock(&raw3215_device_lock); |
701 | for (line = 0; line < NR_3215; line++) { | |
702 | if (!raw3215[line]) { | |
703 | raw3215[line] = raw; | |
704 | break; | |
705 | } | |
706 | } | |
707 | spin_unlock(&raw3215_device_lock); | |
708 | if (line == NR_3215) { | |
fe2fc9ca | 709 | raw3215_free_info(raw); |
1da177e4 LT |
710 | return -ENODEV; |
711 | } | |
712 | ||
1da177e4 LT |
713 | return 0; |
714 | } | |
715 | ||
77812a27 | 716 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
717 | { |
718 | struct raw3215_info *raw; | |
3ec0a17e | 719 | unsigned int line; |
1da177e4 LT |
720 | |
721 | ccw_device_set_offline(cdev); | |
dff59b64 | 722 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 723 | if (raw) { |
3ec0a17e JS |
724 | spin_lock(&raw3215_device_lock); |
725 | for (line = 0; line < NR_3215; line++) | |
726 | if (raw3215[line] == raw) | |
727 | break; | |
728 | raw3215[line] = NULL; | |
729 | spin_unlock(&raw3215_device_lock); | |
dff59b64 | 730 | dev_set_drvdata(&cdev->dev, NULL); |
fe2fc9ca | 731 | raw3215_free_info(raw); |
1da177e4 LT |
732 | } |
733 | } | |
734 | ||
77812a27 | 735 | static int raw3215_set_online (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 | return raw3215_startup(raw); | |
744 | } | |
745 | ||
77812a27 | 746 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
747 | { |
748 | struct raw3215_info *raw; | |
749 | ||
dff59b64 | 750 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
751 | if (!raw) |
752 | return -ENODEV; | |
753 | ||
754 | raw3215_shutdown(raw); | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
77812a27 MS |
759 | static int raw3215_pm_stop(struct ccw_device *cdev) |
760 | { | |
761 | struct raw3215_info *raw; | |
762 | unsigned long flags; | |
763 | ||
764 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 765 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
766 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
767 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
8dd360f0 | 768 | raw->port.flags |= ASYNC_SUSPENDED; |
77812a27 MS |
769 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
770 | return 0; | |
771 | } | |
772 | ||
773 | static int raw3215_pm_start(struct ccw_device *cdev) | |
774 | { | |
775 | struct raw3215_info *raw; | |
776 | unsigned long flags; | |
777 | ||
778 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 779 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 | 780 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
8dd360f0 | 781 | raw->port.flags &= ~ASYNC_SUSPENDED; |
77812a27 MS |
782 | raw->flags |= RAW3215_FLUSHING; |
783 | raw3215_try_io(raw); | |
784 | raw->flags &= ~RAW3215_FLUSHING; | |
785 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
786 | return 0; | |
787 | } | |
788 | ||
1da177e4 LT |
789 | static struct ccw_device_id raw3215_id[] = { |
790 | { CCW_DEVICE(0x3215, 0) }, | |
791 | { /* end of list */ }, | |
792 | }; | |
793 | ||
794 | static struct ccw_driver raw3215_ccw_driver = { | |
3bda058b SO |
795 | .driver = { |
796 | .name = "3215", | |
797 | .owner = THIS_MODULE, | |
798 | }, | |
1da177e4 LT |
799 | .ids = raw3215_id, |
800 | .probe = &raw3215_probe, | |
801 | .remove = &raw3215_remove, | |
802 | .set_online = &raw3215_set_online, | |
803 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
804 | .freeze = &raw3215_pm_stop, |
805 | .thaw = &raw3215_pm_start, | |
806 | .restore = &raw3215_pm_start, | |
de400d6b | 807 | .int_class = IOINT_C15, |
1da177e4 LT |
808 | }; |
809 | ||
810 | #ifdef CONFIG_TN3215_CONSOLE | |
811 | /* | |
812 | * Write a string to the 3215 console | |
813 | */ | |
77812a27 MS |
814 | static void con3215_write(struct console *co, const char *str, |
815 | unsigned int count) | |
1da177e4 LT |
816 | { |
817 | struct raw3215_info *raw; | |
818 | int i; | |
819 | ||
820 | if (count <= 0) | |
821 | return; | |
822 | raw = raw3215[0]; /* console 3215 is the first one */ | |
823 | while (count > 0) { | |
824 | for (i = 0; i < count; i++) | |
825 | if (str[i] == '\t' || str[i] == '\n') | |
826 | break; | |
827 | raw3215_write(raw, str, i); | |
828 | count -= i; | |
829 | str += i; | |
830 | if (count > 0) { | |
831 | raw3215_putchar(raw, *str); | |
832 | count--; | |
833 | str++; | |
834 | } | |
835 | } | |
836 | } | |
837 | ||
838 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
839 | { | |
840 | *index = c->index; | |
841 | return tty3215_driver; | |
842 | } | |
843 | ||
844 | /* | |
2332ce1a HS |
845 | * panic() calls con3215_flush through a panic_notifier |
846 | * before the system enters a disabled, endless loop. | |
1da177e4 | 847 | */ |
77812a27 | 848 | static void con3215_flush(void) |
1da177e4 LT |
849 | { |
850 | struct raw3215_info *raw; | |
851 | unsigned long flags; | |
852 | ||
853 | raw = raw3215[0]; /* console 3215 is the first one */ | |
8dd360f0 | 854 | if (raw->port.flags & ASYNC_SUSPENDED) |
77812a27 MS |
855 | /* The console is still frozen for suspend. */ |
856 | if (ccw_device_force_console()) | |
857 | /* Forcing didn't work, no panic message .. */ | |
858 | return; | |
520a4e37 | 859 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 860 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 861 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
862 | } |
863 | ||
2332ce1a HS |
864 | static int con3215_notify(struct notifier_block *self, |
865 | unsigned long event, void *data) | |
866 | { | |
867 | con3215_flush(); | |
868 | return NOTIFY_OK; | |
869 | } | |
870 | ||
871 | static struct notifier_block on_panic_nb = { | |
872 | .notifier_call = con3215_notify, | |
873 | .priority = 0, | |
874 | }; | |
875 | ||
876 | static struct notifier_block on_reboot_nb = { | |
877 | .notifier_call = con3215_notify, | |
878 | .priority = 0, | |
879 | }; | |
880 | ||
1da177e4 LT |
881 | /* |
882 | * The console structure for the 3215 console | |
883 | */ | |
884 | static struct console con3215 = { | |
885 | .name = "ttyS", | |
886 | .write = con3215_write, | |
887 | .device = con3215_device, | |
1da177e4 LT |
888 | .flags = CON_PRINTBUFFER, |
889 | }; | |
890 | ||
891 | /* | |
892 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 893 | */ |
77812a27 | 894 | static int __init con3215_init(void) |
1da177e4 LT |
895 | { |
896 | struct ccw_device *cdev; | |
897 | struct raw3215_info *raw; | |
898 | struct raw3215_req *req; | |
899 | int i; | |
900 | ||
901 | /* Check if 3215 is to be the console */ | |
902 | if (!CONSOLE_IS_3215) | |
903 | return -ENODEV; | |
904 | ||
905 | /* Set the console mode for VM */ | |
906 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
907 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
908 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
909 | } |
910 | ||
911 | /* allocate 3215 request structures */ | |
912 | raw3215_freelist = NULL; | |
913 | spin_lock_init(&raw3215_freelist_lock); | |
914 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 915 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
916 | req->next = raw3215_freelist; |
917 | raw3215_freelist = req; | |
918 | } | |
919 | ||
920 | cdev = ccw_device_probe_console(); | |
600b5d16 | 921 | if (IS_ERR(cdev)) |
1da177e4 LT |
922 | return -ENODEV; |
923 | ||
fe2fc9ca | 924 | raw3215[0] = raw = raw3215_alloc_info(); |
1da177e4 | 925 | raw->cdev = cdev; |
dff59b64 | 926 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
927 | cdev->handler = raw3215_irq; |
928 | ||
929 | raw->flags |= RAW3215_FIXED; | |
1da177e4 LT |
930 | |
931 | /* Request the console irq */ | |
932 | if (raw3215_startup(raw) != 0) { | |
fe2fc9ca | 933 | raw3215_free_info(raw); |
1da177e4 | 934 | raw3215[0] = NULL; |
1da177e4 LT |
935 | return -ENODEV; |
936 | } | |
2332ce1a HS |
937 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
938 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
939 | register_console(&con3215); |
940 | return 0; | |
941 | } | |
942 | console_initcall(con3215_init); | |
943 | #endif | |
944 | ||
d2281107 JS |
945 | static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) |
946 | { | |
947 | struct raw3215_info *raw; | |
948 | ||
949 | raw = raw3215[tty->index]; | |
950 | if (raw == NULL) | |
951 | return -ENODEV; | |
952 | ||
953 | tty->driver_data = raw; | |
954 | ||
955 | return tty_port_install(&raw->port, driver, tty); | |
956 | } | |
957 | ||
1da177e4 LT |
958 | /* |
959 | * tty3215_open | |
960 | * | |
961 | * This routine is called whenever a 3215 tty is opened. | |
962 | */ | |
77812a27 | 963 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 | 964 | { |
d2281107 | 965 | struct raw3215_info *raw = tty->driver_data; |
410235fd | 966 | int retval; |
1da177e4 | 967 | |
86b26007 | 968 | tty_port_tty_set(&raw->port, tty); |
1da177e4 LT |
969 | |
970 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
971 | /* | |
972 | * Start up 3215 device | |
973 | */ | |
974 | retval = raw3215_startup(raw); | |
975 | if (retval) | |
976 | return retval; | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | /* | |
982 | * tty3215_close() | |
983 | * | |
984 | * This routine is called when the 3215 tty is closed. We wait | |
985 | * for the remaining request to be completed. Then we clean up. | |
986 | */ | |
77812a27 | 987 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
988 | { |
989 | struct raw3215_info *raw; | |
990 | ||
991 | raw = (struct raw3215_info *) tty->driver_data; | |
992 | if (raw == NULL || tty->count > 1) | |
993 | return; | |
994 | tty->closing = 1; | |
995 | /* Shutdown the terminal */ | |
996 | raw3215_shutdown(raw); | |
656d9125 | 997 | tasklet_kill(&raw->tlet); |
1da177e4 | 998 | tty->closing = 0; |
86b26007 | 999 | tty_port_tty_set(&raw->port, NULL); |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | /* | |
1003 | * Returns the amount of free space in the output buffer. | |
1004 | */ | |
77812a27 | 1005 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
1006 | { |
1007 | struct raw3215_info *raw; | |
1008 | ||
1009 | raw = (struct raw3215_info *) tty->driver_data; | |
1010 | ||
1011 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
1012 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
1013 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
1014 | else | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * String write routine for 3215 ttys | |
1020 | */ | |
77812a27 MS |
1021 | static int tty3215_write(struct tty_struct * tty, |
1022 | const unsigned char *buf, int count) | |
1da177e4 LT |
1023 | { |
1024 | struct raw3215_info *raw; | |
1025 | ||
1026 | if (!tty) | |
1027 | return 0; | |
1028 | raw = (struct raw3215_info *) tty->driver_data; | |
1029 | raw3215_write(raw, buf, count); | |
1030 | return count; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Put character routine for 3215 ttys | |
1035 | */ | |
77812a27 | 1036 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1037 | { |
1038 | struct raw3215_info *raw; | |
1039 | ||
1040 | if (!tty) | |
9e7c9a19 | 1041 | return 0; |
1da177e4 LT |
1042 | raw = (struct raw3215_info *) tty->driver_data; |
1043 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1044 | return 1; |
1da177e4 LT |
1045 | } |
1046 | ||
77812a27 | 1047 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1048 | { |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Returns the number of characters in the output buffer | |
1053 | */ | |
77812a27 | 1054 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1055 | { |
1056 | struct raw3215_info *raw; | |
1057 | ||
1058 | raw = (struct raw3215_info *) tty->driver_data; | |
1059 | return raw->count; | |
1060 | } | |
1061 | ||
77812a27 | 1062 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1063 | { |
1064 | struct raw3215_info *raw; | |
1065 | ||
1066 | raw = (struct raw3215_info *) tty->driver_data; | |
1067 | raw3215_flush_buffer(raw); | |
1068 | tty_wakeup(tty); | |
1069 | } | |
1070 | ||
1da177e4 LT |
1071 | /* |
1072 | * Disable reading from a 3215 tty | |
1073 | */ | |
77812a27 | 1074 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1075 | { |
1076 | struct raw3215_info *raw; | |
1077 | ||
1078 | raw = (struct raw3215_info *) tty->driver_data; | |
1079 | raw->flags |= RAW3215_THROTTLED; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Enable reading from a 3215 tty | |
1084 | */ | |
77812a27 | 1085 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1086 | { |
1087 | struct raw3215_info *raw; | |
1088 | unsigned long flags; | |
1089 | ||
1090 | raw = (struct raw3215_info *) tty->driver_data; | |
1091 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1092 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1093 | raw->flags &= ~RAW3215_THROTTLED; |
1094 | raw3215_try_io(raw); | |
520a4e37 | 1095 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1096 | } |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Disable writing to a 3215 tty | |
1101 | */ | |
77812a27 | 1102 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1103 | { |
1104 | struct raw3215_info *raw; | |
1105 | ||
1106 | raw = (struct raw3215_info *) tty->driver_data; | |
1107 | raw->flags |= RAW3215_STOPPED; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Enable writing to a 3215 tty | |
1112 | */ | |
77812a27 | 1113 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1114 | { |
1115 | struct raw3215_info *raw; | |
1116 | unsigned long flags; | |
1117 | ||
1118 | raw = (struct raw3215_info *) tty->driver_data; | |
1119 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1120 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1121 | raw->flags &= ~RAW3215_STOPPED; |
1122 | raw3215_try_io(raw); | |
520a4e37 | 1123 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1124 | } |
1125 | } | |
1126 | ||
b68e31d0 | 1127 | static const struct tty_operations tty3215_ops = { |
d2281107 | 1128 | .install = tty3215_install, |
1da177e4 LT |
1129 | .open = tty3215_open, |
1130 | .close = tty3215_close, | |
1131 | .write = tty3215_write, | |
1132 | .put_char = tty3215_put_char, | |
1133 | .flush_chars = tty3215_flush_chars, | |
1134 | .write_room = tty3215_write_room, | |
1135 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1136 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1137 | .throttle = tty3215_throttle, |
1138 | .unthrottle = tty3215_unthrottle, | |
1139 | .stop = tty3215_stop, | |
1140 | .start = tty3215_start, | |
1141 | }; | |
1142 | ||
1143 | /* | |
1144 | * 3215 tty registration code called from tty_init(). | |
1145 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1146 | */ | |
77812a27 | 1147 | static int __init tty3215_init(void) |
1da177e4 LT |
1148 | { |
1149 | struct tty_driver *driver; | |
1150 | int ret; | |
1151 | ||
1152 | if (!CONSOLE_IS_3215) | |
1153 | return 0; | |
1154 | ||
1155 | driver = alloc_tty_driver(NR_3215); | |
1156 | if (!driver) | |
1157 | return -ENOMEM; | |
1158 | ||
1159 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1160 | if (ret) { | |
1161 | put_tty_driver(driver); | |
1162 | return ret; | |
1163 | } | |
1164 | /* | |
1165 | * Initialize the tty_driver structure | |
1166 | * Entries in tty3215_driver that are NOT initialized: | |
1167 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1168 | */ | |
1169 | ||
1da177e4 LT |
1170 | driver->driver_name = "tty3215"; |
1171 | driver->name = "ttyS"; | |
1172 | driver->major = TTY_MAJOR; | |
1173 | driver->minor_start = 64; | |
1174 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1175 | driver->subtype = SYSTEM_TYPE_TTY; | |
1176 | driver->init_termios = tty_std_termios; | |
1177 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1178 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1179 | driver->init_termios.c_lflag = ISIG; | |
1180 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1181 | tty_set_operations(driver, &tty3215_ops); | |
1182 | ret = tty_register_driver(driver); | |
1183 | if (ret) { | |
1da177e4 LT |
1184 | put_tty_driver(driver); |
1185 | return ret; | |
1186 | } | |
1187 | tty3215_driver = driver; | |
1188 | return 0; | |
1189 | } | |
1190 | ||
77812a27 | 1191 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1192 | { |
1193 | tty_unregister_driver(tty3215_driver); | |
1194 | put_tty_driver(tty3215_driver); | |
1195 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1196 | } | |
1197 | ||
1198 | module_init(tty3215_init); | |
1199 | module_exit(tty3215_exit); |