Commit | Line | Data |
---|---|---|
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 | ||
6673cd0b | 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); | |
ae289dc1 HC |
342 | if (tty) { |
343 | tty_wakeup(tty); | |
344 | tty_kref_put(tty); | |
345 | } | |
656d9125 MS |
346 | } |
347 | ||
1da177e4 | 348 | /* |
408aec3c | 349 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 350 | */ |
86b26007 | 351 | static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) |
1da177e4 | 352 | { |
1da177e4 LT |
353 | raw3215_mk_write_req(raw); |
354 | raw3215_try_io(raw); | |
86b26007 | 355 | if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) |
656d9125 | 356 | tasklet_schedule(&raw->tlet); |
1da177e4 LT |
357 | } |
358 | ||
359 | /* | |
360 | * Interrupt routine, called from common io layer | |
361 | */ | |
77812a27 MS |
362 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
363 | struct irb *irb) | |
1da177e4 LT |
364 | { |
365 | struct raw3215_info *raw; | |
366 | struct raw3215_req *req; | |
367 | struct tty_struct *tty; | |
368 | int cstat, dstat; | |
1d030370 | 369 | int count; |
1da177e4 | 370 | |
dff59b64 | 371 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 372 | req = (struct raw3215_req *) intparm; |
86b26007 | 373 | tty = tty_port_tty_get(&raw->port); |
23d805b6 PO |
374 | cstat = irb->scsw.cmd.cstat; |
375 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 376 | if (cstat != 0) |
86b26007 | 377 | raw3215_next_io(raw, tty); |
1da177e4 LT |
378 | if (dstat & 0x01) { /* we got a unit exception */ |
379 | dstat &= ~0x01; /* we can ignore it */ | |
380 | } | |
381 | switch (dstat) { | |
382 | case 0x80: | |
383 | if (cstat != 0) | |
384 | break; | |
385 | /* Attention interrupt, someone hit the enter key */ | |
386 | raw3215_mk_read_req(raw); | |
86b26007 | 387 | raw3215_next_io(raw, tty); |
1da177e4 LT |
388 | break; |
389 | case 0x08: | |
390 | case 0x0C: | |
391 | /* Channel end interrupt. */ | |
392 | if ((raw = req->info) == NULL) | |
86b26007 | 393 | goto put_tty; /* That shouldn't happen ... */ |
1da177e4 LT |
394 | if (req->type == RAW3215_READ) { |
395 | /* store residual count, then wait for device end */ | |
23d805b6 | 396 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
397 | } |
398 | if (dstat == 0x08) | |
399 | break; | |
400 | case 0x04: | |
401 | /* Device end interrupt. */ | |
402 | if ((raw = req->info) == NULL) | |
86b26007 JS |
403 | goto put_tty; /* That shouldn't happen ... */ |
404 | if (req->type == RAW3215_READ && tty != NULL) { | |
1da177e4 LT |
405 | unsigned int cchar; |
406 | ||
1da177e4 | 407 | count = 160 - req->residual; |
1da177e4 LT |
408 | EBCASC(raw->inbuf, count); |
409 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
410 | switch (cchar & CTRLCHAR_MASK) { | |
411 | case CTRLCHAR_SYSRQ: | |
412 | break; | |
413 | ||
414 | case CTRLCHAR_CTRL: | |
92a19f9c JS |
415 | tty_insert_flip_char(&raw->port, cchar, |
416 | TTY_NORMAL); | |
2e124b4a | 417 | tty_flip_buffer_push(&raw->port); |
1da177e4 LT |
418 | break; |
419 | ||
420 | case CTRLCHAR_NONE: | |
1da177e4 | 421 | if (count < 2 || |
33f0f88f AC |
422 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
423 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
424 | /* add the auto \n */ | |
425 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
426 | count++; |
427 | } else | |
33f0f88f | 428 | count -= 2; |
05c7cd39 JS |
429 | tty_insert_flip_string(&raw->port, raw->inbuf, |
430 | count); | |
2e124b4a | 431 | tty_flip_buffer_push(&raw->port); |
1da177e4 LT |
432 | break; |
433 | } | |
434 | } else if (req->type == RAW3215_WRITE) { | |
435 | raw->count -= req->len; | |
436 | raw->written -= req->len; | |
437 | } | |
438 | raw->flags &= ~RAW3215_WORKING; | |
439 | raw3215_free_req(req); | |
440 | /* check for empty wait */ | |
441 | if (waitqueue_active(&raw->empty_wait) && | |
442 | raw->queued_write == NULL && | |
443 | raw->queued_read == NULL) { | |
444 | wake_up_interruptible(&raw->empty_wait); | |
445 | } | |
86b26007 | 446 | raw3215_next_io(raw, tty); |
1da177e4 LT |
447 | break; |
448 | default: | |
449 | /* Strange interrupt, I'll do my best to clean up */ | |
450 | if (req != NULL && req->type != RAW3215_FREE) { | |
451 | if (req->type == RAW3215_WRITE) { | |
452 | raw->count -= req->len; | |
453 | raw->written -= req->len; | |
454 | } | |
455 | raw->flags &= ~RAW3215_WORKING; | |
456 | raw3215_free_req(req); | |
457 | } | |
86b26007 | 458 | raw3215_next_io(raw, tty); |
1da177e4 | 459 | } |
86b26007 JS |
460 | put_tty: |
461 | tty_kref_put(tty); | |
1da177e4 LT |
462 | } |
463 | ||
77812a27 MS |
464 | /* |
465 | * Drop the oldest line from the output buffer. | |
466 | */ | |
467 | static void raw3215_drop_line(struct raw3215_info *raw) | |
468 | { | |
469 | int ix; | |
470 | char ch; | |
471 | ||
472 | BUG_ON(raw->written != 0); | |
473 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
474 | while (raw->count > 0) { | |
475 | ch = raw->buffer[ix]; | |
476 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
477 | raw->count--; | |
478 | if (ch == 0x15) | |
479 | break; | |
480 | } | |
481 | raw->head = ix; | |
482 | } | |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Wait until length bytes are available int the output buffer. | |
486 | * Has to be called with the s390irq lock held. Can be called | |
487 | * disabled. | |
488 | */ | |
77812a27 | 489 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
490 | { |
491 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
492 | /* While console is frozen for suspend we have no other |
493 | * choice but to drop message from the buffer to make | |
494 | * room for even more messages. */ | |
8dd360f0 | 495 | if (raw->port.flags & ASYNC_SUSPENDED) { |
77812a27 MS |
496 | raw3215_drop_line(raw); |
497 | continue; | |
498 | } | |
1da177e4 LT |
499 | /* there might be a request pending */ |
500 | raw->flags |= RAW3215_FLUSHING; | |
501 | raw3215_mk_write_req(raw); | |
502 | raw3215_try_io(raw); | |
503 | raw->flags &= ~RAW3215_FLUSHING; | |
504 | #ifdef CONFIG_TN3215_CONSOLE | |
505 | wait_cons_dev(); | |
506 | #endif | |
507 | /* Enough room freed up ? */ | |
508 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
509 | break; | |
510 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 511 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 512 | udelay(100); |
520a4e37 | 513 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
514 | } |
515 | } | |
516 | ||
517 | /* | |
518 | * String write routine for 3215 devices | |
519 | */ | |
77812a27 MS |
520 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
521 | unsigned int length) | |
1da177e4 LT |
522 | { |
523 | unsigned long flags; | |
524 | int c, count; | |
525 | ||
526 | while (length > 0) { | |
520a4e37 | 527 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
528 | count = (length > RAW3215_BUFFER_SIZE) ? |
529 | RAW3215_BUFFER_SIZE : length; | |
530 | length -= count; | |
531 | ||
532 | raw3215_make_room(raw, count); | |
533 | ||
534 | /* copy string to output buffer and convert it to EBCDIC */ | |
535 | while (1) { | |
536 | c = min_t(int, count, | |
537 | min(RAW3215_BUFFER_SIZE - raw->count, | |
538 | RAW3215_BUFFER_SIZE - raw->head)); | |
539 | if (c <= 0) | |
540 | break; | |
541 | memcpy(raw->buffer + raw->head, str, c); | |
542 | ASCEBC(raw->buffer + raw->head, c); | |
543 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
544 | raw->count += c; | |
545 | raw->line_pos += c; | |
546 | str += c; | |
547 | count -= c; | |
548 | } | |
549 | if (!(raw->flags & RAW3215_WORKING)) { | |
550 | raw3215_mk_write_req(raw); | |
551 | /* start or queue request */ | |
552 | raw3215_try_io(raw); | |
553 | } | |
520a4e37 | 554 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
555 | } |
556 | } | |
557 | ||
558 | /* | |
559 | * Put character routine for 3215 devices | |
560 | */ | |
77812a27 | 561 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
562 | { |
563 | unsigned long flags; | |
564 | unsigned int length, i; | |
565 | ||
520a4e37 | 566 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
567 | if (ch == '\t') { |
568 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
569 | raw->line_pos += length; | |
570 | ch = ' '; | |
571 | } else if (ch == '\n') { | |
572 | length = 1; | |
573 | raw->line_pos = 0; | |
574 | } else { | |
575 | length = 1; | |
576 | raw->line_pos++; | |
577 | } | |
578 | raw3215_make_room(raw, length); | |
579 | ||
580 | for (i = 0; i < length; i++) { | |
581 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
582 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
583 | raw->count++; | |
584 | } | |
585 | if (!(raw->flags & RAW3215_WORKING)) { | |
586 | raw3215_mk_write_req(raw); | |
587 | /* start or queue request */ | |
588 | raw3215_try_io(raw); | |
589 | } | |
520a4e37 | 590 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
591 | } |
592 | ||
593 | /* | |
594 | * Flush routine, it simply sets the flush flag and tries to start | |
595 | * pending IO. | |
596 | */ | |
77812a27 | 597 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
598 | { |
599 | unsigned long flags; | |
600 | ||
520a4e37 | 601 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
602 | if (raw->count > 0) { |
603 | raw->flags |= RAW3215_FLUSHING; | |
604 | raw3215_try_io(raw); | |
605 | raw->flags &= ~RAW3215_FLUSHING; | |
606 | } | |
520a4e37 | 607 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
608 | } |
609 | ||
610 | /* | |
611 | * Fire up a 3215 device. | |
612 | */ | |
77812a27 | 613 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
614 | { |
615 | unsigned long flags; | |
616 | ||
8dd360f0 | 617 | if (raw->port.flags & ASYNC_INITIALIZED) |
1da177e4 LT |
618 | return 0; |
619 | raw->line_pos = 0; | |
8dd360f0 | 620 | raw->port.flags |= ASYNC_INITIALIZED; |
520a4e37 | 621 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 622 | raw3215_try_io(raw); |
520a4e37 | 623 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
624 | |
625 | return 0; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Shutdown a 3215 device. | |
630 | */ | |
77812a27 | 631 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
632 | { |
633 | DECLARE_WAITQUEUE(wait, current); | |
634 | unsigned long flags; | |
635 | ||
6673cd0b HC |
636 | if (!(raw->port.flags & ASYNC_INITIALIZED) || |
637 | (raw->flags & RAW3215_FIXED)) | |
1da177e4 LT |
638 | return; |
639 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 640 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
641 | if ((raw->flags & RAW3215_WORKING) || |
642 | raw->queued_write != NULL || | |
643 | raw->queued_read != NULL) { | |
8dd360f0 | 644 | raw->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
645 | add_wait_queue(&raw->empty_wait, &wait); |
646 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 647 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 648 | schedule(); |
520a4e37 | 649 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
650 | remove_wait_queue(&raw->empty_wait, &wait); |
651 | set_current_state(TASK_RUNNING); | |
8dd360f0 | 652 | raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING); |
1da177e4 | 653 | } |
520a4e37 | 654 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
655 | } |
656 | ||
fe2fc9ca JS |
657 | static struct raw3215_info *raw3215_alloc_info(void) |
658 | { | |
659 | struct raw3215_info *info; | |
660 | ||
661 | info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); | |
662 | if (!info) | |
663 | return NULL; | |
664 | ||
665 | info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
666 | info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
667 | if (!info->buffer || !info->inbuf) { | |
668 | kfree(info); | |
669 | return NULL; | |
670 | } | |
671 | ||
672 | setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); | |
673 | init_waitqueue_head(&info->empty_wait); | |
674 | tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); | |
8dd360f0 | 675 | tty_port_init(&info->port); |
fe2fc9ca JS |
676 | |
677 | return info; | |
678 | } | |
679 | ||
680 | static void raw3215_free_info(struct raw3215_info *raw) | |
681 | { | |
682 | kfree(raw->inbuf); | |
683 | kfree(raw->buffer); | |
191c5f10 | 684 | tty_port_destroy(&raw->port); |
fe2fc9ca JS |
685 | kfree(raw); |
686 | } | |
687 | ||
77812a27 | 688 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
689 | { |
690 | struct raw3215_info *raw; | |
691 | int line; | |
692 | ||
a2e53801 | 693 | /* Console is special. */ |
dff59b64 | 694 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 695 | return 0; |
fe2fc9ca JS |
696 | |
697 | raw = raw3215_alloc_info(); | |
1da177e4 LT |
698 | if (raw == NULL) |
699 | return -ENOMEM; | |
700 | ||
fe2fc9ca JS |
701 | raw->cdev = cdev; |
702 | dev_set_drvdata(&cdev->dev, raw); | |
703 | cdev->handler = raw3215_irq; | |
704 | ||
1da177e4 LT |
705 | spin_lock(&raw3215_device_lock); |
706 | for (line = 0; line < NR_3215; line++) { | |
707 | if (!raw3215[line]) { | |
708 | raw3215[line] = raw; | |
709 | break; | |
710 | } | |
711 | } | |
712 | spin_unlock(&raw3215_device_lock); | |
713 | if (line == NR_3215) { | |
fe2fc9ca | 714 | raw3215_free_info(raw); |
1da177e4 LT |
715 | return -ENODEV; |
716 | } | |
717 | ||
1da177e4 LT |
718 | return 0; |
719 | } | |
720 | ||
77812a27 | 721 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
722 | { |
723 | struct raw3215_info *raw; | |
3ec0a17e | 724 | unsigned int line; |
1da177e4 LT |
725 | |
726 | ccw_device_set_offline(cdev); | |
dff59b64 | 727 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 728 | if (raw) { |
3ec0a17e JS |
729 | spin_lock(&raw3215_device_lock); |
730 | for (line = 0; line < NR_3215; line++) | |
731 | if (raw3215[line] == raw) | |
732 | break; | |
733 | raw3215[line] = NULL; | |
734 | spin_unlock(&raw3215_device_lock); | |
dff59b64 | 735 | dev_set_drvdata(&cdev->dev, NULL); |
fe2fc9ca | 736 | raw3215_free_info(raw); |
1da177e4 LT |
737 | } |
738 | } | |
739 | ||
77812a27 | 740 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
741 | { |
742 | struct raw3215_info *raw; | |
743 | ||
dff59b64 | 744 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
745 | if (!raw) |
746 | return -ENODEV; | |
747 | ||
748 | return raw3215_startup(raw); | |
749 | } | |
750 | ||
77812a27 | 751 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
752 | { |
753 | struct raw3215_info *raw; | |
754 | ||
dff59b64 | 755 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
756 | if (!raw) |
757 | return -ENODEV; | |
758 | ||
759 | raw3215_shutdown(raw); | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
77812a27 MS |
764 | static int raw3215_pm_stop(struct ccw_device *cdev) |
765 | { | |
766 | struct raw3215_info *raw; | |
767 | unsigned long flags; | |
768 | ||
769 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 770 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
771 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
772 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
8dd360f0 | 773 | raw->port.flags |= ASYNC_SUSPENDED; |
77812a27 MS |
774 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
775 | return 0; | |
776 | } | |
777 | ||
778 | static int raw3215_pm_start(struct ccw_device *cdev) | |
779 | { | |
780 | struct raw3215_info *raw; | |
781 | unsigned long flags; | |
782 | ||
783 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 784 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 | 785 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
8dd360f0 | 786 | raw->port.flags &= ~ASYNC_SUSPENDED; |
77812a27 MS |
787 | raw->flags |= RAW3215_FLUSHING; |
788 | raw3215_try_io(raw); | |
789 | raw->flags &= ~RAW3215_FLUSHING; | |
790 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
791 | return 0; | |
792 | } | |
793 | ||
1da177e4 LT |
794 | static struct ccw_device_id raw3215_id[] = { |
795 | { CCW_DEVICE(0x3215, 0) }, | |
796 | { /* end of list */ }, | |
797 | }; | |
798 | ||
799 | static struct ccw_driver raw3215_ccw_driver = { | |
3bda058b SO |
800 | .driver = { |
801 | .name = "3215", | |
802 | .owner = THIS_MODULE, | |
803 | }, | |
1da177e4 LT |
804 | .ids = raw3215_id, |
805 | .probe = &raw3215_probe, | |
806 | .remove = &raw3215_remove, | |
807 | .set_online = &raw3215_set_online, | |
808 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
809 | .freeze = &raw3215_pm_stop, |
810 | .thaw = &raw3215_pm_start, | |
811 | .restore = &raw3215_pm_start, | |
420f42ec | 812 | .int_class = IRQIO_C15, |
1da177e4 LT |
813 | }; |
814 | ||
815 | #ifdef CONFIG_TN3215_CONSOLE | |
816 | /* | |
817 | * Write a string to the 3215 console | |
818 | */ | |
77812a27 MS |
819 | static void con3215_write(struct console *co, const char *str, |
820 | unsigned int count) | |
1da177e4 LT |
821 | { |
822 | struct raw3215_info *raw; | |
823 | int i; | |
824 | ||
825 | if (count <= 0) | |
826 | return; | |
827 | raw = raw3215[0]; /* console 3215 is the first one */ | |
828 | while (count > 0) { | |
829 | for (i = 0; i < count; i++) | |
830 | if (str[i] == '\t' || str[i] == '\n') | |
831 | break; | |
832 | raw3215_write(raw, str, i); | |
833 | count -= i; | |
834 | str += i; | |
835 | if (count > 0) { | |
836 | raw3215_putchar(raw, *str); | |
837 | count--; | |
838 | str++; | |
839 | } | |
840 | } | |
841 | } | |
842 | ||
843 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
844 | { | |
845 | *index = c->index; | |
846 | return tty3215_driver; | |
847 | } | |
848 | ||
849 | /* | |
2332ce1a HS |
850 | * panic() calls con3215_flush through a panic_notifier |
851 | * before the system enters a disabled, endless loop. | |
1da177e4 | 852 | */ |
77812a27 | 853 | static void con3215_flush(void) |
1da177e4 LT |
854 | { |
855 | struct raw3215_info *raw; | |
856 | unsigned long flags; | |
857 | ||
858 | raw = raw3215[0]; /* console 3215 is the first one */ | |
8dd360f0 | 859 | if (raw->port.flags & ASYNC_SUSPENDED) |
77812a27 MS |
860 | /* The console is still frozen for suspend. */ |
861 | if (ccw_device_force_console()) | |
862 | /* Forcing didn't work, no panic message .. */ | |
863 | return; | |
520a4e37 | 864 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 865 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 866 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
867 | } |
868 | ||
2332ce1a HS |
869 | static int con3215_notify(struct notifier_block *self, |
870 | unsigned long event, void *data) | |
871 | { | |
872 | con3215_flush(); | |
873 | return NOTIFY_OK; | |
874 | } | |
875 | ||
876 | static struct notifier_block on_panic_nb = { | |
877 | .notifier_call = con3215_notify, | |
878 | .priority = 0, | |
879 | }; | |
880 | ||
881 | static struct notifier_block on_reboot_nb = { | |
882 | .notifier_call = con3215_notify, | |
883 | .priority = 0, | |
884 | }; | |
885 | ||
1da177e4 LT |
886 | /* |
887 | * The console structure for the 3215 console | |
888 | */ | |
889 | static struct console con3215 = { | |
890 | .name = "ttyS", | |
891 | .write = con3215_write, | |
892 | .device = con3215_device, | |
1da177e4 LT |
893 | .flags = CON_PRINTBUFFER, |
894 | }; | |
895 | ||
896 | /* | |
897 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 898 | */ |
77812a27 | 899 | static int __init con3215_init(void) |
1da177e4 LT |
900 | { |
901 | struct ccw_device *cdev; | |
902 | struct raw3215_info *raw; | |
903 | struct raw3215_req *req; | |
904 | int i; | |
905 | ||
906 | /* Check if 3215 is to be the console */ | |
907 | if (!CONSOLE_IS_3215) | |
908 | return -ENODEV; | |
909 | ||
910 | /* Set the console mode for VM */ | |
911 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
912 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
913 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
914 | } |
915 | ||
916 | /* allocate 3215 request structures */ | |
917 | raw3215_freelist = NULL; | |
918 | spin_lock_init(&raw3215_freelist_lock); | |
919 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 920 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
921 | req->next = raw3215_freelist; |
922 | raw3215_freelist = req; | |
923 | } | |
924 | ||
925 | cdev = ccw_device_probe_console(); | |
600b5d16 | 926 | if (IS_ERR(cdev)) |
1da177e4 LT |
927 | return -ENODEV; |
928 | ||
fe2fc9ca | 929 | raw3215[0] = raw = raw3215_alloc_info(); |
1da177e4 | 930 | raw->cdev = cdev; |
dff59b64 | 931 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
932 | cdev->handler = raw3215_irq; |
933 | ||
6673cd0b HC |
934 | raw->flags |= RAW3215_FIXED; |
935 | ||
1da177e4 LT |
936 | /* Request the console irq */ |
937 | if (raw3215_startup(raw) != 0) { | |
fe2fc9ca | 938 | raw3215_free_info(raw); |
1da177e4 | 939 | raw3215[0] = NULL; |
1da177e4 LT |
940 | return -ENODEV; |
941 | } | |
2332ce1a HS |
942 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
943 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
944 | register_console(&con3215); |
945 | return 0; | |
946 | } | |
947 | console_initcall(con3215_init); | |
948 | #endif | |
949 | ||
d2281107 JS |
950 | static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) |
951 | { | |
952 | struct raw3215_info *raw; | |
953 | ||
954 | raw = raw3215[tty->index]; | |
955 | if (raw == NULL) | |
956 | return -ENODEV; | |
957 | ||
958 | tty->driver_data = raw; | |
959 | ||
960 | return tty_port_install(&raw->port, driver, tty); | |
961 | } | |
962 | ||
1da177e4 LT |
963 | /* |
964 | * tty3215_open | |
965 | * | |
966 | * This routine is called whenever a 3215 tty is opened. | |
967 | */ | |
77812a27 | 968 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 | 969 | { |
d2281107 | 970 | struct raw3215_info *raw = tty->driver_data; |
410235fd | 971 | int retval; |
1da177e4 | 972 | |
86b26007 | 973 | tty_port_tty_set(&raw->port, tty); |
1da177e4 | 974 | |
d6c53c0e | 975 | raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ |
1da177e4 LT |
976 | /* |
977 | * Start up 3215 device | |
978 | */ | |
979 | retval = raw3215_startup(raw); | |
980 | if (retval) | |
981 | return retval; | |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
986 | /* | |
987 | * tty3215_close() | |
988 | * | |
989 | * This routine is called when the 3215 tty is closed. We wait | |
990 | * for the remaining request to be completed. Then we clean up. | |
991 | */ | |
77812a27 | 992 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
993 | { |
994 | struct raw3215_info *raw; | |
995 | ||
996 | raw = (struct raw3215_info *) tty->driver_data; | |
997 | if (raw == NULL || tty->count > 1) | |
998 | return; | |
999 | tty->closing = 1; | |
1000 | /* Shutdown the terminal */ | |
1001 | raw3215_shutdown(raw); | |
656d9125 | 1002 | tasklet_kill(&raw->tlet); |
1da177e4 | 1003 | tty->closing = 0; |
86b26007 | 1004 | tty_port_tty_set(&raw->port, NULL); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | /* | |
1008 | * Returns the amount of free space in the output buffer. | |
1009 | */ | |
77812a27 | 1010 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
1011 | { |
1012 | struct raw3215_info *raw; | |
1013 | ||
1014 | raw = (struct raw3215_info *) tty->driver_data; | |
1015 | ||
1016 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
1017 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
1018 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
1019 | else | |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * String write routine for 3215 ttys | |
1025 | */ | |
77812a27 MS |
1026 | static int tty3215_write(struct tty_struct * tty, |
1027 | const unsigned char *buf, int count) | |
1da177e4 LT |
1028 | { |
1029 | struct raw3215_info *raw; | |
1030 | ||
1031 | if (!tty) | |
1032 | return 0; | |
1033 | raw = (struct raw3215_info *) tty->driver_data; | |
1034 | raw3215_write(raw, buf, count); | |
1035 | return count; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Put character routine for 3215 ttys | |
1040 | */ | |
77812a27 | 1041 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1042 | { |
1043 | struct raw3215_info *raw; | |
1044 | ||
1045 | if (!tty) | |
9e7c9a19 | 1046 | return 0; |
1da177e4 LT |
1047 | raw = (struct raw3215_info *) tty->driver_data; |
1048 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1049 | return 1; |
1da177e4 LT |
1050 | } |
1051 | ||
77812a27 | 1052 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1053 | { |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * Returns the number of characters in the output buffer | |
1058 | */ | |
77812a27 | 1059 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1060 | { |
1061 | struct raw3215_info *raw; | |
1062 | ||
1063 | raw = (struct raw3215_info *) tty->driver_data; | |
1064 | return raw->count; | |
1065 | } | |
1066 | ||
77812a27 | 1067 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1068 | { |
1069 | struct raw3215_info *raw; | |
1070 | ||
1071 | raw = (struct raw3215_info *) tty->driver_data; | |
1072 | raw3215_flush_buffer(raw); | |
1073 | tty_wakeup(tty); | |
1074 | } | |
1075 | ||
1da177e4 LT |
1076 | /* |
1077 | * Disable reading from a 3215 tty | |
1078 | */ | |
77812a27 | 1079 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1080 | { |
1081 | struct raw3215_info *raw; | |
1082 | ||
1083 | raw = (struct raw3215_info *) tty->driver_data; | |
1084 | raw->flags |= RAW3215_THROTTLED; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Enable reading from a 3215 tty | |
1089 | */ | |
77812a27 | 1090 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1091 | { |
1092 | struct raw3215_info *raw; | |
1093 | unsigned long flags; | |
1094 | ||
1095 | raw = (struct raw3215_info *) tty->driver_data; | |
1096 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1097 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1098 | raw->flags &= ~RAW3215_THROTTLED; |
1099 | raw3215_try_io(raw); | |
520a4e37 | 1100 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1101 | } |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * Disable writing to a 3215 tty | |
1106 | */ | |
77812a27 | 1107 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1108 | { |
1109 | struct raw3215_info *raw; | |
1110 | ||
1111 | raw = (struct raw3215_info *) tty->driver_data; | |
1112 | raw->flags |= RAW3215_STOPPED; | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * Enable writing to a 3215 tty | |
1117 | */ | |
77812a27 | 1118 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1119 | { |
1120 | struct raw3215_info *raw; | |
1121 | unsigned long flags; | |
1122 | ||
1123 | raw = (struct raw3215_info *) tty->driver_data; | |
1124 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1125 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1126 | raw->flags &= ~RAW3215_STOPPED; |
1127 | raw3215_try_io(raw); | |
520a4e37 | 1128 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1129 | } |
1130 | } | |
1131 | ||
b68e31d0 | 1132 | static const struct tty_operations tty3215_ops = { |
d2281107 | 1133 | .install = tty3215_install, |
1da177e4 LT |
1134 | .open = tty3215_open, |
1135 | .close = tty3215_close, | |
1136 | .write = tty3215_write, | |
1137 | .put_char = tty3215_put_char, | |
1138 | .flush_chars = tty3215_flush_chars, | |
1139 | .write_room = tty3215_write_room, | |
1140 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1141 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1142 | .throttle = tty3215_throttle, |
1143 | .unthrottle = tty3215_unthrottle, | |
1144 | .stop = tty3215_stop, | |
1145 | .start = tty3215_start, | |
1146 | }; | |
1147 | ||
1148 | /* | |
1149 | * 3215 tty registration code called from tty_init(). | |
1150 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1151 | */ | |
77812a27 | 1152 | static int __init tty3215_init(void) |
1da177e4 LT |
1153 | { |
1154 | struct tty_driver *driver; | |
1155 | int ret; | |
1156 | ||
1157 | if (!CONSOLE_IS_3215) | |
1158 | return 0; | |
1159 | ||
1160 | driver = alloc_tty_driver(NR_3215); | |
1161 | if (!driver) | |
1162 | return -ENOMEM; | |
1163 | ||
1164 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1165 | if (ret) { | |
1166 | put_tty_driver(driver); | |
1167 | return ret; | |
1168 | } | |
1169 | /* | |
1170 | * Initialize the tty_driver structure | |
1171 | * Entries in tty3215_driver that are NOT initialized: | |
1172 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1173 | */ | |
1174 | ||
1da177e4 LT |
1175 | driver->driver_name = "tty3215"; |
1176 | driver->name = "ttyS"; | |
1177 | driver->major = TTY_MAJOR; | |
1178 | driver->minor_start = 64; | |
1179 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1180 | driver->subtype = SYSTEM_TYPE_TTY; | |
1181 | driver->init_termios = tty_std_termios; | |
1182 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
1183 | driver->init_termios.c_oflag = ONLCR | XTABS; | |
1184 | driver->init_termios.c_lflag = ISIG; | |
1185 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1186 | tty_set_operations(driver, &tty3215_ops); | |
1187 | ret = tty_register_driver(driver); | |
1188 | if (ret) { | |
1da177e4 LT |
1189 | put_tty_driver(driver); |
1190 | return ret; | |
1191 | } | |
1192 | tty3215_driver = driver; | |
1193 | return 0; | |
1194 | } | |
1195 | ||
77812a27 | 1196 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1197 | { |
1198 | tty_unregister_driver(tty3215_driver); | |
1199 | put_tty_driver(tty3215_driver); | |
1200 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1201 | } | |
1202 | ||
1203 | module_init(tty3215_init); | |
1204 | module_exit(tty3215_exit); |