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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 | ||
1da177e4 LT |
47 | #define RAW3215_WORKING 4 /* set if a request is being worked on */ |
48 | #define RAW3215_THROTTLED 8 /* set if reading is disabled */ | |
49 | #define RAW3215_STOPPED 16 /* set if writing is disabled */ | |
1da177e4 LT |
50 | #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ |
51 | #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ | |
52 | ||
53 | #define TAB_STOP_SIZE 8 /* tab stop size */ | |
54 | ||
55 | /* | |
56 | * Request types for a 3215 device | |
57 | */ | |
58 | enum raw3215_type { | |
59 | RAW3215_FREE, RAW3215_READ, RAW3215_WRITE | |
60 | }; | |
61 | ||
62 | /* | |
63 | * Request structure for a 3215 device | |
64 | */ | |
65 | struct raw3215_req { | |
66 | enum raw3215_type type; /* type of the request */ | |
67 | int start, len; /* start index & len in output buffer */ | |
68 | int delayable; /* indication to wait for more data */ | |
69 | int residual; /* residual count for read request */ | |
70 | struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ | |
71 | struct raw3215_info *info; /* pointer to main structure */ | |
72 | struct raw3215_req *next; /* pointer to next request */ | |
73 | } __attribute__ ((aligned(8))); | |
74 | ||
75 | struct raw3215_info { | |
8dd360f0 | 76 | struct tty_port port; |
1da177e4 LT |
77 | struct ccw_device *cdev; /* device for tty driver */ |
78 | spinlock_t *lock; /* pointer to irq lock */ | |
79 | int flags; /* state flags */ | |
80 | char *buffer; /* pointer to output buffer */ | |
81 | char *inbuf; /* pointer to input buffer */ | |
82 | int head; /* first free byte in output buffer */ | |
83 | int count; /* number of bytes in output buffer */ | |
84 | int written; /* number of bytes in write requests */ | |
1da177e4 LT |
85 | struct raw3215_req *queued_read; /* pointer to queued read requests */ |
86 | struct raw3215_req *queued_write;/* pointer to queued write requests */ | |
656d9125 | 87 | struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ |
1da177e4 LT |
88 | wait_queue_head_t empty_wait; /* wait queue for flushing */ |
89 | struct timer_list timer; /* timer for delayed output */ | |
1da177e4 LT |
90 | int line_pos; /* position on the line (for tabs) */ |
91 | char ubuffer[80]; /* copy_from_user buffer */ | |
92 | }; | |
93 | ||
94 | /* array of 3215 devices structures */ | |
95 | static struct raw3215_info *raw3215[NR_3215]; | |
96 | /* spinlock to protect the raw3215 array */ | |
97 | static DEFINE_SPINLOCK(raw3215_device_lock); | |
98 | /* list of free request structures */ | |
99 | static struct raw3215_req *raw3215_freelist; | |
100 | /* spinlock to protect free list */ | |
101 | static spinlock_t raw3215_freelist_lock; | |
102 | ||
103 | static struct tty_driver *tty3215_driver; | |
104 | ||
105 | /* | |
106 | * Get a request structure from the free list | |
107 | */ | |
77812a27 MS |
108 | static inline struct raw3215_req *raw3215_alloc_req(void) |
109 | { | |
1da177e4 LT |
110 | struct raw3215_req *req; |
111 | unsigned long flags; | |
112 | ||
113 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
114 | req = raw3215_freelist; | |
115 | raw3215_freelist = req->next; | |
116 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
117 | return req; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Put a request structure back to the free list | |
122 | */ | |
77812a27 MS |
123 | static inline void raw3215_free_req(struct raw3215_req *req) |
124 | { | |
1da177e4 LT |
125 | unsigned long flags; |
126 | ||
127 | if (req->type == RAW3215_FREE) | |
128 | return; /* don't free a free request */ | |
129 | req->type = RAW3215_FREE; | |
130 | spin_lock_irqsave(&raw3215_freelist_lock, flags); | |
131 | req->next = raw3215_freelist; | |
132 | raw3215_freelist = req; | |
133 | spin_unlock_irqrestore(&raw3215_freelist_lock, flags); | |
134 | } | |
135 | ||
136 | /* | |
137 | * Set up a read request that reads up to 160 byte from the 3215 device. | |
138 | * If there is a queued read request it is used, but that shouldn't happen | |
139 | * because a 3215 terminal won't accept a new read before the old one is | |
140 | * completed. | |
141 | */ | |
77812a27 | 142 | static void raw3215_mk_read_req(struct raw3215_info *raw) |
1da177e4 LT |
143 | { |
144 | struct raw3215_req *req; | |
145 | struct ccw1 *ccw; | |
146 | ||
147 | /* there can only be ONE read request at a time */ | |
148 | req = raw->queued_read; | |
149 | if (req == NULL) { | |
150 | /* no queued read request, use new req structure */ | |
151 | req = raw3215_alloc_req(); | |
152 | req->type = RAW3215_READ; | |
153 | req->info = raw; | |
154 | raw->queued_read = req; | |
155 | } | |
156 | ||
157 | ccw = req->ccws; | |
158 | ccw->cmd_code = 0x0A; /* read inquiry */ | |
159 | ccw->flags = 0x20; /* ignore incorrect length */ | |
160 | ccw->count = 160; | |
161 | ccw->cda = (__u32) __pa(raw->inbuf); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Set up a write request with the information from the main structure. | |
166 | * A ccw chain is created that writes as much as possible from the output | |
167 | * buffer to the 3215 device. If a queued write exists it is replaced by | |
168 | * the new, probably lengthened request. | |
169 | */ | |
77812a27 | 170 | static void raw3215_mk_write_req(struct raw3215_info *raw) |
1da177e4 LT |
171 | { |
172 | struct raw3215_req *req; | |
173 | struct ccw1 *ccw; | |
174 | int len, count, ix, lines; | |
175 | ||
176 | if (raw->count <= raw->written) | |
177 | return; | |
178 | /* check if there is a queued write request */ | |
179 | req = raw->queued_write; | |
180 | if (req == NULL) { | |
181 | /* no queued write request, use new req structure */ | |
182 | req = raw3215_alloc_req(); | |
183 | req->type = RAW3215_WRITE; | |
184 | req->info = raw; | |
185 | raw->queued_write = req; | |
186 | } else { | |
187 | raw->written -= req->len; | |
188 | } | |
189 | ||
190 | ccw = req->ccws; | |
191 | req->start = (raw->head - raw->count + raw->written) & | |
192 | (RAW3215_BUFFER_SIZE - 1); | |
193 | /* | |
194 | * now we have to count newlines. We can at max accept | |
195 | * RAW3215_MAX_NEWLINE newlines in a single ssch due to | |
196 | * a restriction in VM | |
197 | */ | |
198 | lines = 0; | |
199 | ix = req->start; | |
200 | while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { | |
201 | if (raw->buffer[ix] == 0x15) | |
202 | lines++; | |
203 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
204 | } | |
205 | len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; | |
206 | if (len > RAW3215_MAX_BYTES) | |
207 | len = RAW3215_MAX_BYTES; | |
208 | req->len = len; | |
209 | raw->written += len; | |
210 | ||
211 | /* set the indication if we should try to enlarge this request */ | |
212 | req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); | |
213 | ||
214 | ix = req->start; | |
215 | while (len > 0) { | |
216 | if (ccw > req->ccws) | |
217 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
218 | ccw->cmd_code = 0x01; /* write, auto carrier return */ | |
219 | ccw->flags = 0x20; /* ignore incorrect length ind. */ | |
220 | ccw->cda = | |
221 | (__u32) __pa(raw->buffer + ix); | |
222 | count = len; | |
223 | if (ix + count > RAW3215_BUFFER_SIZE) | |
224 | count = RAW3215_BUFFER_SIZE - ix; | |
225 | ccw->count = count; | |
226 | len -= count; | |
227 | ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); | |
228 | ccw++; | |
229 | } | |
230 | /* | |
231 | * Add a NOP to the channel program. 3215 devices are purely | |
232 | * emulated and its much better to avoid the channel end | |
233 | * interrupt in this case. | |
234 | */ | |
235 | if (ccw > req->ccws) | |
236 | ccw[-1].flags |= 0x40; /* use command chaining */ | |
237 | ccw->cmd_code = 0x03; /* NOP */ | |
238 | ccw->flags = 0; | |
239 | ccw->cda = 0; | |
240 | ccw->count = 1; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Start a read or a write request | |
245 | */ | |
77812a27 | 246 | static void raw3215_start_io(struct raw3215_info *raw) |
1da177e4 LT |
247 | { |
248 | struct raw3215_req *req; | |
249 | int res; | |
250 | ||
251 | req = raw->queued_read; | |
252 | if (req != NULL && | |
253 | !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { | |
254 | /* dequeue request */ | |
255 | raw->queued_read = NULL; | |
256 | res = ccw_device_start(raw->cdev, req->ccws, | |
257 | (unsigned long) req, 0, 0); | |
258 | if (res != 0) { | |
259 | /* do_IO failed, put request back to queue */ | |
260 | raw->queued_read = req; | |
261 | } else { | |
262 | raw->flags |= RAW3215_WORKING; | |
263 | } | |
264 | } | |
265 | req = raw->queued_write; | |
266 | if (req != NULL && | |
267 | !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { | |
268 | /* dequeue request */ | |
269 | raw->queued_write = NULL; | |
270 | res = ccw_device_start(raw->cdev, req->ccws, | |
271 | (unsigned long) req, 0, 0); | |
272 | if (res != 0) { | |
273 | /* do_IO failed, put request back to queue */ | |
274 | raw->queued_write = req; | |
275 | } else { | |
276 | raw->flags |= RAW3215_WORKING; | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
281 | /* | |
282 | * Function to start a delayed output after RAW3215_TIMEOUT seconds | |
283 | */ | |
77812a27 | 284 | static void raw3215_timeout(unsigned long __data) |
1da177e4 LT |
285 | { |
286 | struct raw3215_info *raw = (struct raw3215_info *) __data; | |
287 | unsigned long flags; | |
288 | ||
520a4e37 | 289 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
290 | if (raw->flags & RAW3215_TIMER_RUNS) { |
291 | del_timer(&raw->timer); | |
292 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
8dd360f0 | 293 | if (!(raw->port.flags & ASYNC_SUSPENDED)) { |
77812a27 MS |
294 | raw3215_mk_write_req(raw); |
295 | raw3215_start_io(raw); | |
296 | } | |
1da177e4 | 297 | } |
520a4e37 | 298 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
299 | } |
300 | ||
301 | /* | |
302 | * Function to conditionally start an IO. A read is started immediately, | |
303 | * a write is only started immediately if the flush flag is on or the | |
304 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
305 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
306 | */ | |
77812a27 | 307 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 308 | { |
8dd360f0 JS |
309 | if (!(raw->port.flags & ASYNC_INITIALIZED) || |
310 | (raw->port.flags & ASYNC_SUSPENDED)) | |
1da177e4 LT |
311 | return; |
312 | if (raw->queued_read != NULL) | |
313 | raw3215_start_io(raw); | |
314 | else if (raw->queued_write != NULL) { | |
315 | if ((raw->queued_write->delayable == 0) || | |
316 | (raw->flags & RAW3215_FLUSHING)) { | |
317 | /* execute write requests bigger than minimum size */ | |
318 | raw3215_start_io(raw); | |
319 | if (raw->flags & RAW3215_TIMER_RUNS) { | |
320 | del_timer(&raw->timer); | |
321 | raw->flags &= ~RAW3215_TIMER_RUNS; | |
322 | } | |
323 | } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { | |
324 | /* delay small writes */ | |
1da177e4 | 325 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; |
1da177e4 LT |
326 | add_timer(&raw->timer); |
327 | raw->flags |= RAW3215_TIMER_RUNS; | |
328 | } | |
329 | } | |
330 | } | |
331 | ||
656d9125 MS |
332 | /* |
333 | * Call tty_wakeup from tasklet context | |
334 | */ | |
335 | static void raw3215_wakeup(unsigned long data) | |
336 | { | |
337 | struct raw3215_info *raw = (struct raw3215_info *) data; | |
e695b286 HC |
338 | struct tty_struct *tty; |
339 | ||
340 | tty = tty_port_tty_get(&raw->port); | |
ae289dc1 HC |
341 | if (tty) { |
342 | tty_wakeup(tty); | |
343 | tty_kref_put(tty); | |
344 | } | |
656d9125 MS |
345 | } |
346 | ||
1da177e4 | 347 | /* |
408aec3c | 348 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 349 | */ |
86b26007 | 350 | static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) |
1da177e4 | 351 | { |
1da177e4 LT |
352 | raw3215_mk_write_req(raw); |
353 | raw3215_try_io(raw); | |
86b26007 | 354 | if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) |
656d9125 | 355 | tasklet_schedule(&raw->tlet); |
1da177e4 LT |
356 | } |
357 | ||
358 | /* | |
359 | * Interrupt routine, called from common io layer | |
360 | */ | |
77812a27 MS |
361 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
362 | struct irb *irb) | |
1da177e4 LT |
363 | { |
364 | struct raw3215_info *raw; | |
365 | struct raw3215_req *req; | |
366 | struct tty_struct *tty; | |
367 | int cstat, dstat; | |
1d030370 | 368 | int count; |
1da177e4 | 369 | |
dff59b64 | 370 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 371 | req = (struct raw3215_req *) intparm; |
86b26007 | 372 | tty = tty_port_tty_get(&raw->port); |
23d805b6 PO |
373 | cstat = irb->scsw.cmd.cstat; |
374 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 375 | if (cstat != 0) |
86b26007 | 376 | raw3215_next_io(raw, tty); |
1da177e4 LT |
377 | if (dstat & 0x01) { /* we got a unit exception */ |
378 | dstat &= ~0x01; /* we can ignore it */ | |
379 | } | |
380 | switch (dstat) { | |
381 | case 0x80: | |
382 | if (cstat != 0) | |
383 | break; | |
384 | /* Attention interrupt, someone hit the enter key */ | |
385 | raw3215_mk_read_req(raw); | |
86b26007 | 386 | raw3215_next_io(raw, tty); |
1da177e4 LT |
387 | break; |
388 | case 0x08: | |
389 | case 0x0C: | |
390 | /* Channel end interrupt. */ | |
391 | if ((raw = req->info) == NULL) | |
86b26007 | 392 | goto put_tty; /* That shouldn't happen ... */ |
1da177e4 LT |
393 | if (req->type == RAW3215_READ) { |
394 | /* store residual count, then wait for device end */ | |
23d805b6 | 395 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
396 | } |
397 | if (dstat == 0x08) | |
398 | break; | |
399 | case 0x04: | |
400 | /* Device end interrupt. */ | |
401 | if ((raw = req->info) == NULL) | |
86b26007 JS |
402 | goto put_tty; /* That shouldn't happen ... */ |
403 | if (req->type == RAW3215_READ && tty != NULL) { | |
1da177e4 LT |
404 | unsigned int cchar; |
405 | ||
1da177e4 | 406 | count = 160 - req->residual; |
1da177e4 LT |
407 | EBCASC(raw->inbuf, count); |
408 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
409 | switch (cchar & CTRLCHAR_MASK) { | |
410 | case CTRLCHAR_SYSRQ: | |
411 | break; | |
412 | ||
413 | case CTRLCHAR_CTRL: | |
92a19f9c JS |
414 | tty_insert_flip_char(&raw->port, cchar, |
415 | TTY_NORMAL); | |
86b26007 | 416 | tty_flip_buffer_push(tty); |
1da177e4 LT |
417 | break; |
418 | ||
419 | case CTRLCHAR_NONE: | |
1da177e4 | 420 | if (count < 2 || |
33f0f88f AC |
421 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
422 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
423 | /* add the auto \n */ | |
424 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
425 | count++; |
426 | } else | |
33f0f88f | 427 | count -= 2; |
05c7cd39 JS |
428 | tty_insert_flip_string(&raw->port, raw->inbuf, |
429 | count); | |
86b26007 | 430 | tty_flip_buffer_push(tty); |
1da177e4 LT |
431 | break; |
432 | } | |
433 | } else if (req->type == RAW3215_WRITE) { | |
434 | raw->count -= req->len; | |
435 | raw->written -= req->len; | |
436 | } | |
437 | raw->flags &= ~RAW3215_WORKING; | |
438 | raw3215_free_req(req); | |
439 | /* check for empty wait */ | |
440 | if (waitqueue_active(&raw->empty_wait) && | |
441 | raw->queued_write == NULL && | |
442 | raw->queued_read == NULL) { | |
443 | wake_up_interruptible(&raw->empty_wait); | |
444 | } | |
86b26007 | 445 | raw3215_next_io(raw, tty); |
1da177e4 LT |
446 | break; |
447 | default: | |
448 | /* Strange interrupt, I'll do my best to clean up */ | |
449 | if (req != NULL && req->type != RAW3215_FREE) { | |
450 | if (req->type == RAW3215_WRITE) { | |
451 | raw->count -= req->len; | |
452 | raw->written -= req->len; | |
453 | } | |
454 | raw->flags &= ~RAW3215_WORKING; | |
455 | raw3215_free_req(req); | |
456 | } | |
86b26007 | 457 | raw3215_next_io(raw, tty); |
1da177e4 | 458 | } |
86b26007 JS |
459 | put_tty: |
460 | tty_kref_put(tty); | |
1da177e4 LT |
461 | } |
462 | ||
77812a27 MS |
463 | /* |
464 | * Drop the oldest line from the output buffer. | |
465 | */ | |
466 | static void raw3215_drop_line(struct raw3215_info *raw) | |
467 | { | |
468 | int ix; | |
469 | char ch; | |
470 | ||
471 | BUG_ON(raw->written != 0); | |
472 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
473 | while (raw->count > 0) { | |
474 | ch = raw->buffer[ix]; | |
475 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
476 | raw->count--; | |
477 | if (ch == 0x15) | |
478 | break; | |
479 | } | |
480 | raw->head = ix; | |
481 | } | |
482 | ||
1da177e4 LT |
483 | /* |
484 | * Wait until length bytes are available int the output buffer. | |
485 | * Has to be called with the s390irq lock held. Can be called | |
486 | * disabled. | |
487 | */ | |
77812a27 | 488 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
489 | { |
490 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
491 | /* While console is frozen for suspend we have no other |
492 | * choice but to drop message from the buffer to make | |
493 | * room for even more messages. */ | |
8dd360f0 | 494 | if (raw->port.flags & ASYNC_SUSPENDED) { |
77812a27 MS |
495 | raw3215_drop_line(raw); |
496 | continue; | |
497 | } | |
1da177e4 LT |
498 | /* there might be a request pending */ |
499 | raw->flags |= RAW3215_FLUSHING; | |
500 | raw3215_mk_write_req(raw); | |
501 | raw3215_try_io(raw); | |
502 | raw->flags &= ~RAW3215_FLUSHING; | |
503 | #ifdef CONFIG_TN3215_CONSOLE | |
504 | wait_cons_dev(); | |
505 | #endif | |
506 | /* Enough room freed up ? */ | |
507 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
508 | break; | |
509 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 510 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 511 | udelay(100); |
520a4e37 | 512 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
513 | } |
514 | } | |
515 | ||
516 | /* | |
517 | * String write routine for 3215 devices | |
518 | */ | |
77812a27 MS |
519 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
520 | unsigned int length) | |
1da177e4 LT |
521 | { |
522 | unsigned long flags; | |
523 | int c, count; | |
524 | ||
525 | while (length > 0) { | |
520a4e37 | 526 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
527 | count = (length > RAW3215_BUFFER_SIZE) ? |
528 | RAW3215_BUFFER_SIZE : length; | |
529 | length -= count; | |
530 | ||
531 | raw3215_make_room(raw, count); | |
532 | ||
533 | /* copy string to output buffer and convert it to EBCDIC */ | |
534 | while (1) { | |
535 | c = min_t(int, count, | |
536 | min(RAW3215_BUFFER_SIZE - raw->count, | |
537 | RAW3215_BUFFER_SIZE - raw->head)); | |
538 | if (c <= 0) | |
539 | break; | |
540 | memcpy(raw->buffer + raw->head, str, c); | |
541 | ASCEBC(raw->buffer + raw->head, c); | |
542 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
543 | raw->count += c; | |
544 | raw->line_pos += c; | |
545 | str += c; | |
546 | count -= c; | |
547 | } | |
548 | if (!(raw->flags & RAW3215_WORKING)) { | |
549 | raw3215_mk_write_req(raw); | |
550 | /* start or queue request */ | |
551 | raw3215_try_io(raw); | |
552 | } | |
520a4e37 | 553 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
554 | } |
555 | } | |
556 | ||
557 | /* | |
558 | * Put character routine for 3215 devices | |
559 | */ | |
77812a27 | 560 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
561 | { |
562 | unsigned long flags; | |
563 | unsigned int length, i; | |
564 | ||
520a4e37 | 565 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
566 | if (ch == '\t') { |
567 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
568 | raw->line_pos += length; | |
569 | ch = ' '; | |
570 | } else if (ch == '\n') { | |
571 | length = 1; | |
572 | raw->line_pos = 0; | |
573 | } else { | |
574 | length = 1; | |
575 | raw->line_pos++; | |
576 | } | |
577 | raw3215_make_room(raw, length); | |
578 | ||
579 | for (i = 0; i < length; i++) { | |
580 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
581 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
582 | raw->count++; | |
583 | } | |
584 | if (!(raw->flags & RAW3215_WORKING)) { | |
585 | raw3215_mk_write_req(raw); | |
586 | /* start or queue request */ | |
587 | raw3215_try_io(raw); | |
588 | } | |
520a4e37 | 589 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
590 | } |
591 | ||
592 | /* | |
593 | * Flush routine, it simply sets the flush flag and tries to start | |
594 | * pending IO. | |
595 | */ | |
77812a27 | 596 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
597 | { |
598 | unsigned long flags; | |
599 | ||
520a4e37 | 600 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
601 | if (raw->count > 0) { |
602 | raw->flags |= RAW3215_FLUSHING; | |
603 | raw3215_try_io(raw); | |
604 | raw->flags &= ~RAW3215_FLUSHING; | |
605 | } | |
520a4e37 | 606 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
607 | } |
608 | ||
609 | /* | |
610 | * Fire up a 3215 device. | |
611 | */ | |
77812a27 | 612 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
613 | { |
614 | unsigned long flags; | |
615 | ||
8dd360f0 | 616 | if (raw->port.flags & ASYNC_INITIALIZED) |
1da177e4 LT |
617 | return 0; |
618 | raw->line_pos = 0; | |
8dd360f0 | 619 | raw->port.flags |= ASYNC_INITIALIZED; |
520a4e37 | 620 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 621 | raw3215_try_io(raw); |
520a4e37 | 622 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
623 | |
624 | return 0; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Shutdown a 3215 device. | |
629 | */ | |
77812a27 | 630 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
631 | { |
632 | DECLARE_WAITQUEUE(wait, current); | |
633 | unsigned long flags; | |
634 | ||
ae289dc1 | 635 | if (!(raw->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
636 | return; |
637 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 638 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
639 | if ((raw->flags & RAW3215_WORKING) || |
640 | raw->queued_write != NULL || | |
641 | raw->queued_read != NULL) { | |
8dd360f0 | 642 | raw->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
643 | add_wait_queue(&raw->empty_wait, &wait); |
644 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 645 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 646 | schedule(); |
520a4e37 | 647 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
648 | remove_wait_queue(&raw->empty_wait, &wait); |
649 | set_current_state(TASK_RUNNING); | |
8dd360f0 | 650 | raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING); |
1da177e4 | 651 | } |
520a4e37 | 652 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
653 | } |
654 | ||
fe2fc9ca JS |
655 | static struct raw3215_info *raw3215_alloc_info(void) |
656 | { | |
657 | struct raw3215_info *info; | |
658 | ||
659 | info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); | |
660 | if (!info) | |
661 | return NULL; | |
662 | ||
663 | info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
664 | info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
665 | if (!info->buffer || !info->inbuf) { | |
666 | kfree(info); | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); | |
671 | init_waitqueue_head(&info->empty_wait); | |
672 | tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); | |
8dd360f0 | 673 | tty_port_init(&info->port); |
fe2fc9ca JS |
674 | |
675 | return info; | |
676 | } | |
677 | ||
678 | static void raw3215_free_info(struct raw3215_info *raw) | |
679 | { | |
680 | kfree(raw->inbuf); | |
681 | kfree(raw->buffer); | |
191c5f10 | 682 | tty_port_destroy(&raw->port); |
fe2fc9ca JS |
683 | kfree(raw); |
684 | } | |
685 | ||
77812a27 | 686 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
687 | { |
688 | struct raw3215_info *raw; | |
689 | int line; | |
690 | ||
a2e53801 | 691 | /* Console is special. */ |
dff59b64 | 692 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 693 | return 0; |
fe2fc9ca JS |
694 | |
695 | raw = raw3215_alloc_info(); | |
1da177e4 LT |
696 | if (raw == NULL) |
697 | return -ENOMEM; | |
698 | ||
fe2fc9ca JS |
699 | raw->cdev = cdev; |
700 | dev_set_drvdata(&cdev->dev, raw); | |
701 | cdev->handler = raw3215_irq; | |
702 | ||
1da177e4 LT |
703 | spin_lock(&raw3215_device_lock); |
704 | for (line = 0; line < NR_3215; line++) { | |
705 | if (!raw3215[line]) { | |
706 | raw3215[line] = raw; | |
707 | break; | |
708 | } | |
709 | } | |
710 | spin_unlock(&raw3215_device_lock); | |
711 | if (line == NR_3215) { | |
fe2fc9ca | 712 | raw3215_free_info(raw); |
1da177e4 LT |
713 | return -ENODEV; |
714 | } | |
715 | ||
1da177e4 LT |
716 | return 0; |
717 | } | |
718 | ||
77812a27 | 719 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
720 | { |
721 | struct raw3215_info *raw; | |
3ec0a17e | 722 | unsigned int line; |
1da177e4 LT |
723 | |
724 | ccw_device_set_offline(cdev); | |
dff59b64 | 725 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 726 | if (raw) { |
3ec0a17e JS |
727 | spin_lock(&raw3215_device_lock); |
728 | for (line = 0; line < NR_3215; line++) | |
729 | if (raw3215[line] == raw) | |
730 | break; | |
731 | raw3215[line] = NULL; | |
732 | spin_unlock(&raw3215_device_lock); | |
dff59b64 | 733 | dev_set_drvdata(&cdev->dev, NULL); |
fe2fc9ca | 734 | raw3215_free_info(raw); |
1da177e4 LT |
735 | } |
736 | } | |
737 | ||
77812a27 | 738 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
739 | { |
740 | struct raw3215_info *raw; | |
741 | ||
dff59b64 | 742 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
743 | if (!raw) |
744 | return -ENODEV; | |
745 | ||
746 | return raw3215_startup(raw); | |
747 | } | |
748 | ||
77812a27 | 749 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
750 | { |
751 | struct raw3215_info *raw; | |
752 | ||
dff59b64 | 753 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
754 | if (!raw) |
755 | return -ENODEV; | |
756 | ||
757 | raw3215_shutdown(raw); | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
77812a27 MS |
762 | static int raw3215_pm_stop(struct ccw_device *cdev) |
763 | { | |
764 | struct raw3215_info *raw; | |
765 | unsigned long flags; | |
766 | ||
767 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 768 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
769 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
770 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
8dd360f0 | 771 | raw->port.flags |= ASYNC_SUSPENDED; |
77812a27 MS |
772 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
773 | return 0; | |
774 | } | |
775 | ||
776 | static int raw3215_pm_start(struct ccw_device *cdev) | |
777 | { | |
778 | struct raw3215_info *raw; | |
779 | unsigned long flags; | |
780 | ||
781 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 782 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 | 783 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
8dd360f0 | 784 | raw->port.flags &= ~ASYNC_SUSPENDED; |
77812a27 MS |
785 | raw->flags |= RAW3215_FLUSHING; |
786 | raw3215_try_io(raw); | |
787 | raw->flags &= ~RAW3215_FLUSHING; | |
788 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
789 | return 0; | |
790 | } | |
791 | ||
1da177e4 LT |
792 | static struct ccw_device_id raw3215_id[] = { |
793 | { CCW_DEVICE(0x3215, 0) }, | |
794 | { /* end of list */ }, | |
795 | }; | |
796 | ||
797 | static struct ccw_driver raw3215_ccw_driver = { | |
3bda058b SO |
798 | .driver = { |
799 | .name = "3215", | |
800 | .owner = THIS_MODULE, | |
801 | }, | |
1da177e4 LT |
802 | .ids = raw3215_id, |
803 | .probe = &raw3215_probe, | |
804 | .remove = &raw3215_remove, | |
805 | .set_online = &raw3215_set_online, | |
806 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
807 | .freeze = &raw3215_pm_stop, |
808 | .thaw = &raw3215_pm_start, | |
809 | .restore = &raw3215_pm_start, | |
de400d6b | 810 | .int_class = IOINT_C15, |
1da177e4 LT |
811 | }; |
812 | ||
813 | #ifdef CONFIG_TN3215_CONSOLE | |
814 | /* | |
815 | * Write a string to the 3215 console | |
816 | */ | |
77812a27 MS |
817 | static void con3215_write(struct console *co, const char *str, |
818 | unsigned int count) | |
1da177e4 LT |
819 | { |
820 | struct raw3215_info *raw; | |
821 | int i; | |
822 | ||
823 | if (count <= 0) | |
824 | return; | |
825 | raw = raw3215[0]; /* console 3215 is the first one */ | |
826 | while (count > 0) { | |
827 | for (i = 0; i < count; i++) | |
828 | if (str[i] == '\t' || str[i] == '\n') | |
829 | break; | |
830 | raw3215_write(raw, str, i); | |
831 | count -= i; | |
832 | str += i; | |
833 | if (count > 0) { | |
834 | raw3215_putchar(raw, *str); | |
835 | count--; | |
836 | str++; | |
837 | } | |
838 | } | |
839 | } | |
840 | ||
841 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
842 | { | |
843 | *index = c->index; | |
844 | return tty3215_driver; | |
845 | } | |
846 | ||
847 | /* | |
2332ce1a HS |
848 | * panic() calls con3215_flush through a panic_notifier |
849 | * before the system enters a disabled, endless loop. | |
1da177e4 | 850 | */ |
77812a27 | 851 | static void con3215_flush(void) |
1da177e4 LT |
852 | { |
853 | struct raw3215_info *raw; | |
854 | unsigned long flags; | |
855 | ||
856 | raw = raw3215[0]; /* console 3215 is the first one */ | |
8dd360f0 | 857 | if (raw->port.flags & ASYNC_SUSPENDED) |
77812a27 MS |
858 | /* The console is still frozen for suspend. */ |
859 | if (ccw_device_force_console()) | |
860 | /* Forcing didn't work, no panic message .. */ | |
861 | return; | |
520a4e37 | 862 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 863 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 864 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
865 | } |
866 | ||
2332ce1a HS |
867 | static int con3215_notify(struct notifier_block *self, |
868 | unsigned long event, void *data) | |
869 | { | |
870 | con3215_flush(); | |
871 | return NOTIFY_OK; | |
872 | } | |
873 | ||
874 | static struct notifier_block on_panic_nb = { | |
875 | .notifier_call = con3215_notify, | |
876 | .priority = 0, | |
877 | }; | |
878 | ||
879 | static struct notifier_block on_reboot_nb = { | |
880 | .notifier_call = con3215_notify, | |
881 | .priority = 0, | |
882 | }; | |
883 | ||
1da177e4 LT |
884 | /* |
885 | * The console structure for the 3215 console | |
886 | */ | |
887 | static struct console con3215 = { | |
888 | .name = "ttyS", | |
889 | .write = con3215_write, | |
890 | .device = con3215_device, | |
1da177e4 LT |
891 | .flags = CON_PRINTBUFFER, |
892 | }; | |
893 | ||
894 | /* | |
895 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 896 | */ |
77812a27 | 897 | static int __init con3215_init(void) |
1da177e4 LT |
898 | { |
899 | struct ccw_device *cdev; | |
900 | struct raw3215_info *raw; | |
901 | struct raw3215_req *req; | |
902 | int i; | |
903 | ||
904 | /* Check if 3215 is to be the console */ | |
905 | if (!CONSOLE_IS_3215) | |
906 | return -ENODEV; | |
907 | ||
908 | /* Set the console mode for VM */ | |
909 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
910 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
911 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
912 | } |
913 | ||
914 | /* allocate 3215 request structures */ | |
915 | raw3215_freelist = NULL; | |
916 | spin_lock_init(&raw3215_freelist_lock); | |
917 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 918 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
919 | req->next = raw3215_freelist; |
920 | raw3215_freelist = req; | |
921 | } | |
922 | ||
923 | cdev = ccw_device_probe_console(); | |
600b5d16 | 924 | if (IS_ERR(cdev)) |
1da177e4 LT |
925 | return -ENODEV; |
926 | ||
fe2fc9ca | 927 | raw3215[0] = raw = raw3215_alloc_info(); |
1da177e4 | 928 | raw->cdev = cdev; |
dff59b64 | 929 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
930 | cdev->handler = raw3215_irq; |
931 | ||
1da177e4 LT |
932 | /* Request the console irq */ |
933 | if (raw3215_startup(raw) != 0) { | |
fe2fc9ca | 934 | raw3215_free_info(raw); |
1da177e4 | 935 | raw3215[0] = NULL; |
1da177e4 LT |
936 | return -ENODEV; |
937 | } | |
2332ce1a HS |
938 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
939 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
940 | register_console(&con3215); |
941 | return 0; | |
942 | } | |
943 | console_initcall(con3215_init); | |
944 | #endif | |
945 | ||
d2281107 JS |
946 | static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) |
947 | { | |
948 | struct raw3215_info *raw; | |
949 | ||
950 | raw = raw3215[tty->index]; | |
951 | if (raw == NULL) | |
952 | return -ENODEV; | |
953 | ||
954 | tty->driver_data = raw; | |
955 | ||
956 | return tty_port_install(&raw->port, driver, tty); | |
957 | } | |
958 | ||
1da177e4 LT |
959 | /* |
960 | * tty3215_open | |
961 | * | |
962 | * This routine is called whenever a 3215 tty is opened. | |
963 | */ | |
77812a27 | 964 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 | 965 | { |
d2281107 | 966 | struct raw3215_info *raw = tty->driver_data; |
410235fd | 967 | int retval; |
1da177e4 | 968 | |
86b26007 | 969 | tty_port_tty_set(&raw->port, tty); |
1da177e4 LT |
970 | |
971 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ | |
972 | /* | |
973 | * Start up 3215 device | |
974 | */ | |
975 | retval = raw3215_startup(raw); | |
976 | if (retval) | |
977 | return retval; | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | /* | |
983 | * tty3215_close() | |
984 | * | |
985 | * This routine is called when the 3215 tty is closed. We wait | |
986 | * for the remaining request to be completed. Then we clean up. | |
987 | */ | |
77812a27 | 988 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
989 | { |
990 | struct raw3215_info *raw; | |
991 | ||
992 | raw = (struct raw3215_info *) tty->driver_data; | |
993 | if (raw == NULL || tty->count > 1) | |
994 | return; | |
995 | tty->closing = 1; | |
996 | /* Shutdown the terminal */ | |
997 | raw3215_shutdown(raw); | |
656d9125 | 998 | tasklet_kill(&raw->tlet); |
1da177e4 | 999 | tty->closing = 0; |
86b26007 | 1000 | tty_port_tty_set(&raw->port, NULL); |
1da177e4 LT |
1001 | } |
1002 | ||
1003 | /* | |
1004 | * Returns the amount of free space in the output buffer. | |
1005 | */ | |
77812a27 | 1006 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
1007 | { |
1008 | struct raw3215_info *raw; | |
1009 | ||
1010 | raw = (struct raw3215_info *) tty->driver_data; | |
1011 | ||
1012 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
1013 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
1014 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
1015 | else | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * String write routine for 3215 ttys | |
1021 | */ | |
77812a27 MS |
1022 | static int tty3215_write(struct tty_struct * tty, |
1023 | const unsigned char *buf, int count) | |
1da177e4 LT |
1024 | { |
1025 | struct raw3215_info *raw; | |
1026 | ||
1027 | if (!tty) | |
1028 | return 0; | |
1029 | raw = (struct raw3215_info *) tty->driver_data; | |
1030 | raw3215_write(raw, buf, count); | |
1031 | return count; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Put character routine for 3215 ttys | |
1036 | */ | |
77812a27 | 1037 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1038 | { |
1039 | struct raw3215_info *raw; | |
1040 | ||
1041 | if (!tty) | |
9e7c9a19 | 1042 | return 0; |
1da177e4 LT |
1043 | raw = (struct raw3215_info *) tty->driver_data; |
1044 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1045 | return 1; |
1da177e4 LT |
1046 | } |
1047 | ||
77812a27 | 1048 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1049 | { |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Returns the number of characters in the output buffer | |
1054 | */ | |
77812a27 | 1055 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1056 | { |
1057 | struct raw3215_info *raw; | |
1058 | ||
1059 | raw = (struct raw3215_info *) tty->driver_data; | |
1060 | return raw->count; | |
1061 | } | |
1062 | ||
77812a27 | 1063 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1064 | { |
1065 | struct raw3215_info *raw; | |
1066 | ||
1067 | raw = (struct raw3215_info *) tty->driver_data; | |
1068 | raw3215_flush_buffer(raw); | |
1069 | tty_wakeup(tty); | |
1070 | } | |
1071 | ||
1da177e4 LT |
1072 | /* |
1073 | * Disable reading from a 3215 tty | |
1074 | */ | |
77812a27 | 1075 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1076 | { |
1077 | struct raw3215_info *raw; | |
1078 | ||
1079 | raw = (struct raw3215_info *) tty->driver_data; | |
1080 | raw->flags |= RAW3215_THROTTLED; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * Enable reading from a 3215 tty | |
1085 | */ | |
77812a27 | 1086 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1087 | { |
1088 | struct raw3215_info *raw; | |
1089 | unsigned long flags; | |
1090 | ||
1091 | raw = (struct raw3215_info *) tty->driver_data; | |
1092 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1093 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1094 | raw->flags &= ~RAW3215_THROTTLED; |
1095 | raw3215_try_io(raw); | |
520a4e37 | 1096 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1097 | } |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * Disable writing to a 3215 tty | |
1102 | */ | |
77812a27 | 1103 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1104 | { |
1105 | struct raw3215_info *raw; | |
1106 | ||
1107 | raw = (struct raw3215_info *) tty->driver_data; | |
1108 | raw->flags |= RAW3215_STOPPED; | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * Enable writing to a 3215 tty | |
1113 | */ | |
77812a27 | 1114 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1115 | { |
1116 | struct raw3215_info *raw; | |
1117 | unsigned long flags; | |
1118 | ||
1119 | raw = (struct raw3215_info *) tty->driver_data; | |
1120 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1121 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1122 | raw->flags &= ~RAW3215_STOPPED; |
1123 | raw3215_try_io(raw); | |
520a4e37 | 1124 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1125 | } |
1126 | } | |
1127 | ||
b68e31d0 | 1128 | static const struct tty_operations tty3215_ops = { |
d2281107 | 1129 | .install = tty3215_install, |
1da177e4 LT |
1130 | .open = tty3215_open, |
1131 | .close = tty3215_close, | |
1132 | .write = tty3215_write, | |
1133 | .put_char = tty3215_put_char, | |
1134 | .flush_chars = tty3215_flush_chars, | |
1135 | .write_room = tty3215_write_room, | |
1136 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1137 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1138 | .throttle = tty3215_throttle, |
1139 | .unthrottle = tty3215_unthrottle, | |
1140 | .stop = tty3215_stop, | |
1141 | .start = tty3215_start, | |
1142 | }; | |
1143 | ||
1144 | /* | |
1145 | * 3215 tty registration code called from tty_init(). | |
1146 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1147 | */ | |
77812a27 | 1148 | static int __init tty3215_init(void) |
1da177e4 LT |
1149 | { |
1150 | struct tty_driver *driver; | |
1151 | int ret; | |
1152 | ||
1153 | if (!CONSOLE_IS_3215) | |
1154 | return 0; | |
1155 | ||
1156 | driver = alloc_tty_driver(NR_3215); | |
1157 | if (!driver) | |
1158 | return -ENOMEM; | |
1159 | ||
1160 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1161 | if (ret) { | |
1162 | put_tty_driver(driver); | |
1163 | return ret; | |
1164 | } | |
1165 | /* | |
1166 | * Initialize the tty_driver structure | |
1167 | * Entries in tty3215_driver that are NOT initialized: | |
1168 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1169 | */ | |
1170 | ||
1da177e4 LT |
1171 | driver->driver_name = "tty3215"; |
1172 | driver->name = "ttyS"; | |
1173 | driver->major = TTY_MAJOR; | |
1174 | driver->minor_start = 64; | |
1175 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1176 | driver->subtype = SYSTEM_TYPE_TTY; | |
1177 | driver->init_termios = tty_std_termios; | |
1178 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1179 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1180 | driver->init_termios.c_lflag = ISIG; | |
1181 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1182 | tty_set_operations(driver, &tty3215_ops); | |
1183 | ret = tty_register_driver(driver); | |
1184 | if (ret) { | |
1da177e4 LT |
1185 | put_tty_driver(driver); |
1186 | return ret; | |
1187 | } | |
1188 | tty3215_driver = driver; | |
1189 | return 0; | |
1190 | } | |
1191 | ||
77812a27 | 1192 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1193 | { |
1194 | tty_unregister_driver(tty3215_driver); | |
1195 | put_tty_driver(tty3215_driver); | |
1196 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1197 | } | |
1198 | ||
1199 | module_init(tty3215_init); | |
1200 | module_exit(tty3215_exit); |