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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 | ||
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); |
26d766c6 | 291 | raw->flags &= ~RAW3215_TIMER_RUNS; |
80f02d54 | 292 | if (!tty_port_suspended(&raw->port)) { |
26d766c6 MS |
293 | raw3215_mk_write_req(raw); |
294 | raw3215_start_io(raw); | |
295 | if ((raw->queued_read || raw->queued_write) && | |
296 | !(raw->flags & RAW3215_WORKING) && | |
297 | !(raw->flags & RAW3215_TIMER_RUNS)) { | |
298 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
299 | add_timer(&raw->timer); | |
300 | raw->flags |= RAW3215_TIMER_RUNS; | |
77812a27 | 301 | } |
1da177e4 | 302 | } |
520a4e37 | 303 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
304 | } |
305 | ||
306 | /* | |
307 | * Function to conditionally start an IO. A read is started immediately, | |
308 | * a write is only started immediately if the flush flag is on or the | |
309 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
310 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
311 | */ | |
77812a27 | 312 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 313 | { |
d41861ca | 314 | if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port)) |
1da177e4 LT |
315 | return; |
316 | if (raw->queued_read != NULL) | |
317 | raw3215_start_io(raw); | |
318 | else if (raw->queued_write != NULL) { | |
319 | if ((raw->queued_write->delayable == 0) || | |
320 | (raw->flags & RAW3215_FLUSHING)) { | |
321 | /* execute write requests bigger than minimum size */ | |
322 | raw3215_start_io(raw); | |
1da177e4 LT |
323 | } |
324 | } | |
26d766c6 MS |
325 | if ((raw->queued_read || raw->queued_write) && |
326 | !(raw->flags & RAW3215_WORKING) && | |
327 | !(raw->flags & RAW3215_TIMER_RUNS)) { | |
328 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
329 | add_timer(&raw->timer); | |
330 | raw->flags |= RAW3215_TIMER_RUNS; | |
331 | } | |
1da177e4 LT |
332 | } |
333 | ||
656d9125 MS |
334 | /* |
335 | * Call tty_wakeup from tasklet context | |
336 | */ | |
337 | static void raw3215_wakeup(unsigned long data) | |
338 | { | |
339 | struct raw3215_info *raw = (struct raw3215_info *) data; | |
e695b286 HC |
340 | struct tty_struct *tty; |
341 | ||
342 | tty = tty_port_tty_get(&raw->port); | |
ae289dc1 HC |
343 | if (tty) { |
344 | tty_wakeup(tty); | |
345 | tty_kref_put(tty); | |
346 | } | |
656d9125 MS |
347 | } |
348 | ||
1da177e4 | 349 | /* |
408aec3c | 350 | * Try to start the next IO and wake up processes waiting on the tty. |
1da177e4 | 351 | */ |
86b26007 | 352 | static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) |
1da177e4 | 353 | { |
1da177e4 LT |
354 | raw3215_mk_write_req(raw); |
355 | raw3215_try_io(raw); | |
86b26007 | 356 | if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) |
656d9125 | 357 | tasklet_schedule(&raw->tlet); |
1da177e4 LT |
358 | } |
359 | ||
360 | /* | |
361 | * Interrupt routine, called from common io layer | |
362 | */ | |
77812a27 MS |
363 | static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, |
364 | struct irb *irb) | |
1da177e4 LT |
365 | { |
366 | struct raw3215_info *raw; | |
367 | struct raw3215_req *req; | |
368 | struct tty_struct *tty; | |
369 | int cstat, dstat; | |
1d030370 | 370 | int count; |
1da177e4 | 371 | |
dff59b64 | 372 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 373 | req = (struct raw3215_req *) intparm; |
86b26007 | 374 | tty = tty_port_tty_get(&raw->port); |
23d805b6 PO |
375 | cstat = irb->scsw.cmd.cstat; |
376 | dstat = irb->scsw.cmd.dstat; | |
26348f78 | 377 | if (cstat != 0) |
86b26007 | 378 | raw3215_next_io(raw, tty); |
1da177e4 LT |
379 | if (dstat & 0x01) { /* we got a unit exception */ |
380 | dstat &= ~0x01; /* we can ignore it */ | |
381 | } | |
382 | switch (dstat) { | |
383 | case 0x80: | |
384 | if (cstat != 0) | |
385 | break; | |
386 | /* Attention interrupt, someone hit the enter key */ | |
387 | raw3215_mk_read_req(raw); | |
86b26007 | 388 | raw3215_next_io(raw, tty); |
1da177e4 LT |
389 | break; |
390 | case 0x08: | |
391 | case 0x0C: | |
392 | /* Channel end interrupt. */ | |
393 | if ((raw = req->info) == NULL) | |
86b26007 | 394 | goto put_tty; /* That shouldn't happen ... */ |
1da177e4 LT |
395 | if (req->type == RAW3215_READ) { |
396 | /* store residual count, then wait for device end */ | |
23d805b6 | 397 | req->residual = irb->scsw.cmd.count; |
1da177e4 LT |
398 | } |
399 | if (dstat == 0x08) | |
400 | break; | |
401 | case 0x04: | |
402 | /* Device end interrupt. */ | |
403 | if ((raw = req->info) == NULL) | |
86b26007 JS |
404 | goto put_tty; /* That shouldn't happen ... */ |
405 | if (req->type == RAW3215_READ && tty != NULL) { | |
1da177e4 LT |
406 | unsigned int cchar; |
407 | ||
1da177e4 | 408 | count = 160 - req->residual; |
1da177e4 LT |
409 | EBCASC(raw->inbuf, count); |
410 | cchar = ctrlchar_handle(raw->inbuf, count, tty); | |
411 | switch (cchar & CTRLCHAR_MASK) { | |
412 | case CTRLCHAR_SYSRQ: | |
413 | break; | |
414 | ||
415 | case CTRLCHAR_CTRL: | |
92a19f9c JS |
416 | tty_insert_flip_char(&raw->port, cchar, |
417 | TTY_NORMAL); | |
2e124b4a | 418 | tty_flip_buffer_push(&raw->port); |
1da177e4 LT |
419 | break; |
420 | ||
421 | case CTRLCHAR_NONE: | |
1da177e4 | 422 | if (count < 2 || |
33f0f88f AC |
423 | (strncmp(raw->inbuf+count-2, "\252n", 2) && |
424 | strncmp(raw->inbuf+count-2, "^n", 2)) ) { | |
425 | /* add the auto \n */ | |
426 | raw->inbuf[count] = '\n'; | |
1da177e4 LT |
427 | count++; |
428 | } else | |
33f0f88f | 429 | count -= 2; |
05c7cd39 JS |
430 | tty_insert_flip_string(&raw->port, raw->inbuf, |
431 | count); | |
2e124b4a | 432 | tty_flip_buffer_push(&raw->port); |
1da177e4 LT |
433 | break; |
434 | } | |
435 | } else if (req->type == RAW3215_WRITE) { | |
436 | raw->count -= req->len; | |
437 | raw->written -= req->len; | |
438 | } | |
439 | raw->flags &= ~RAW3215_WORKING; | |
440 | raw3215_free_req(req); | |
441 | /* check for empty wait */ | |
442 | if (waitqueue_active(&raw->empty_wait) && | |
443 | raw->queued_write == NULL && | |
444 | raw->queued_read == NULL) { | |
445 | wake_up_interruptible(&raw->empty_wait); | |
446 | } | |
86b26007 | 447 | raw3215_next_io(raw, tty); |
1da177e4 LT |
448 | break; |
449 | default: | |
450 | /* Strange interrupt, I'll do my best to clean up */ | |
451 | if (req != NULL && req->type != RAW3215_FREE) { | |
452 | if (req->type == RAW3215_WRITE) { | |
453 | raw->count -= req->len; | |
454 | raw->written -= req->len; | |
455 | } | |
456 | raw->flags &= ~RAW3215_WORKING; | |
457 | raw3215_free_req(req); | |
458 | } | |
86b26007 | 459 | raw3215_next_io(raw, tty); |
1da177e4 | 460 | } |
86b26007 JS |
461 | put_tty: |
462 | tty_kref_put(tty); | |
1da177e4 LT |
463 | } |
464 | ||
77812a27 MS |
465 | /* |
466 | * Drop the oldest line from the output buffer. | |
467 | */ | |
468 | static void raw3215_drop_line(struct raw3215_info *raw) | |
469 | { | |
470 | int ix; | |
471 | char ch; | |
472 | ||
473 | BUG_ON(raw->written != 0); | |
474 | ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); | |
475 | while (raw->count > 0) { | |
476 | ch = raw->buffer[ix]; | |
477 | ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); | |
478 | raw->count--; | |
479 | if (ch == 0x15) | |
480 | break; | |
481 | } | |
482 | raw->head = ix; | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* |
486 | * Wait until length bytes are available int the output buffer. | |
487 | * Has to be called with the s390irq lock held. Can be called | |
488 | * disabled. | |
489 | */ | |
77812a27 | 490 | static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) |
1da177e4 LT |
491 | { |
492 | while (RAW3215_BUFFER_SIZE - raw->count < length) { | |
77812a27 MS |
493 | /* While console is frozen for suspend we have no other |
494 | * choice but to drop message from the buffer to make | |
495 | * room for even more messages. */ | |
80f02d54 | 496 | if (tty_port_suspended(&raw->port)) { |
77812a27 MS |
497 | raw3215_drop_line(raw); |
498 | continue; | |
499 | } | |
1da177e4 LT |
500 | /* there might be a request pending */ |
501 | raw->flags |= RAW3215_FLUSHING; | |
502 | raw3215_mk_write_req(raw); | |
503 | raw3215_try_io(raw); | |
504 | raw->flags &= ~RAW3215_FLUSHING; | |
505 | #ifdef CONFIG_TN3215_CONSOLE | |
188561a4 | 506 | ccw_device_wait_idle(raw->cdev); |
1da177e4 LT |
507 | #endif |
508 | /* Enough room freed up ? */ | |
509 | if (RAW3215_BUFFER_SIZE - raw->count >= length) | |
510 | break; | |
511 | /* there might be another cpu waiting for the lock */ | |
520a4e37 | 512 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
1da177e4 | 513 | udelay(100); |
520a4e37 | 514 | spin_lock(get_ccwdev_lock(raw->cdev)); |
1da177e4 LT |
515 | } |
516 | } | |
517 | ||
518 | /* | |
519 | * String write routine for 3215 devices | |
520 | */ | |
77812a27 MS |
521 | static void raw3215_write(struct raw3215_info *raw, const char *str, |
522 | unsigned int length) | |
1da177e4 LT |
523 | { |
524 | unsigned long flags; | |
525 | int c, count; | |
526 | ||
527 | while (length > 0) { | |
520a4e37 | 528 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
529 | count = (length > RAW3215_BUFFER_SIZE) ? |
530 | RAW3215_BUFFER_SIZE : length; | |
531 | length -= count; | |
532 | ||
533 | raw3215_make_room(raw, count); | |
534 | ||
535 | /* copy string to output buffer and convert it to EBCDIC */ | |
536 | while (1) { | |
537 | c = min_t(int, count, | |
538 | min(RAW3215_BUFFER_SIZE - raw->count, | |
539 | RAW3215_BUFFER_SIZE - raw->head)); | |
540 | if (c <= 0) | |
541 | break; | |
542 | memcpy(raw->buffer + raw->head, str, c); | |
543 | ASCEBC(raw->buffer + raw->head, c); | |
544 | raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); | |
545 | raw->count += c; | |
546 | raw->line_pos += c; | |
547 | str += c; | |
548 | count -= c; | |
549 | } | |
550 | if (!(raw->flags & RAW3215_WORKING)) { | |
551 | raw3215_mk_write_req(raw); | |
552 | /* start or queue request */ | |
553 | raw3215_try_io(raw); | |
554 | } | |
520a4e37 | 555 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
556 | } |
557 | } | |
558 | ||
559 | /* | |
560 | * Put character routine for 3215 devices | |
561 | */ | |
77812a27 | 562 | static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
1da177e4 LT |
563 | { |
564 | unsigned long flags; | |
565 | unsigned int length, i; | |
566 | ||
520a4e37 | 567 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
568 | if (ch == '\t') { |
569 | length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); | |
570 | raw->line_pos += length; | |
571 | ch = ' '; | |
572 | } else if (ch == '\n') { | |
573 | length = 1; | |
574 | raw->line_pos = 0; | |
575 | } else { | |
576 | length = 1; | |
577 | raw->line_pos++; | |
578 | } | |
579 | raw3215_make_room(raw, length); | |
580 | ||
581 | for (i = 0; i < length; i++) { | |
582 | raw->buffer[raw->head] = (char) _ascebc[(int) ch]; | |
583 | raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); | |
584 | raw->count++; | |
585 | } | |
586 | if (!(raw->flags & RAW3215_WORKING)) { | |
587 | raw3215_mk_write_req(raw); | |
588 | /* start or queue request */ | |
589 | raw3215_try_io(raw); | |
590 | } | |
520a4e37 | 591 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
592 | } |
593 | ||
594 | /* | |
595 | * Flush routine, it simply sets the flush flag and tries to start | |
596 | * pending IO. | |
597 | */ | |
77812a27 | 598 | static void raw3215_flush_buffer(struct raw3215_info *raw) |
1da177e4 LT |
599 | { |
600 | unsigned long flags; | |
601 | ||
520a4e37 | 602 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
603 | if (raw->count > 0) { |
604 | raw->flags |= RAW3215_FLUSHING; | |
605 | raw3215_try_io(raw); | |
606 | raw->flags &= ~RAW3215_FLUSHING; | |
607 | } | |
520a4e37 | 608 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
612 | * Fire up a 3215 device. | |
613 | */ | |
77812a27 | 614 | static int raw3215_startup(struct raw3215_info *raw) |
1da177e4 LT |
615 | { |
616 | unsigned long flags; | |
617 | ||
d41861ca | 618 | if (tty_port_initialized(&raw->port)) |
1da177e4 LT |
619 | return 0; |
620 | raw->line_pos = 0; | |
d41861ca | 621 | tty_port_set_initialized(&raw->port, 1); |
520a4e37 | 622 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 623 | raw3215_try_io(raw); |
520a4e37 | 624 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
625 | |
626 | return 0; | |
627 | } | |
628 | ||
629 | /* | |
630 | * Shutdown a 3215 device. | |
631 | */ | |
77812a27 | 632 | static void raw3215_shutdown(struct raw3215_info *raw) |
1da177e4 LT |
633 | { |
634 | DECLARE_WAITQUEUE(wait, current); | |
635 | unsigned long flags; | |
636 | ||
d41861ca | 637 | if (!tty_port_initialized(&raw->port) || (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) { | |
1da177e4 LT |
644 | add_wait_queue(&raw->empty_wait, &wait); |
645 | set_current_state(TASK_INTERRUPTIBLE); | |
520a4e37 | 646 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 647 | schedule(); |
520a4e37 | 648 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
649 | remove_wait_queue(&raw->empty_wait, &wait); |
650 | set_current_state(TASK_RUNNING); | |
d41861ca | 651 | tty_port_set_initialized(&raw->port, 1); |
1da177e4 | 652 | } |
520a4e37 | 653 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
654 | } |
655 | ||
fe2fc9ca JS |
656 | static struct raw3215_info *raw3215_alloc_info(void) |
657 | { | |
658 | struct raw3215_info *info; | |
659 | ||
660 | info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); | |
661 | if (!info) | |
662 | return NULL; | |
663 | ||
664 | info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); | |
665 | info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); | |
666 | if (!info->buffer || !info->inbuf) { | |
0a7c501e CJ |
667 | kfree(info->inbuf); |
668 | kfree(info->buffer); | |
fe2fc9ca JS |
669 | kfree(info); |
670 | return NULL; | |
671 | } | |
672 | ||
673 | setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); | |
674 | init_waitqueue_head(&info->empty_wait); | |
675 | tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); | |
8dd360f0 | 676 | tty_port_init(&info->port); |
fe2fc9ca JS |
677 | |
678 | return info; | |
679 | } | |
680 | ||
681 | static void raw3215_free_info(struct raw3215_info *raw) | |
682 | { | |
683 | kfree(raw->inbuf); | |
684 | kfree(raw->buffer); | |
191c5f10 | 685 | tty_port_destroy(&raw->port); |
fe2fc9ca JS |
686 | kfree(raw); |
687 | } | |
688 | ||
77812a27 | 689 | static int raw3215_probe (struct ccw_device *cdev) |
1da177e4 LT |
690 | { |
691 | struct raw3215_info *raw; | |
692 | int line; | |
693 | ||
a2e53801 | 694 | /* Console is special. */ |
dff59b64 | 695 | if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) |
a2e53801 | 696 | return 0; |
fe2fc9ca JS |
697 | |
698 | raw = raw3215_alloc_info(); | |
1da177e4 LT |
699 | if (raw == NULL) |
700 | return -ENOMEM; | |
701 | ||
fe2fc9ca JS |
702 | raw->cdev = cdev; |
703 | dev_set_drvdata(&cdev->dev, raw); | |
704 | cdev->handler = raw3215_irq; | |
705 | ||
1da177e4 LT |
706 | spin_lock(&raw3215_device_lock); |
707 | for (line = 0; line < NR_3215; line++) { | |
708 | if (!raw3215[line]) { | |
709 | raw3215[line] = raw; | |
710 | break; | |
711 | } | |
712 | } | |
713 | spin_unlock(&raw3215_device_lock); | |
714 | if (line == NR_3215) { | |
fe2fc9ca | 715 | raw3215_free_info(raw); |
1da177e4 LT |
716 | return -ENODEV; |
717 | } | |
718 | ||
1da177e4 LT |
719 | return 0; |
720 | } | |
721 | ||
77812a27 | 722 | static void raw3215_remove (struct ccw_device *cdev) |
1da177e4 LT |
723 | { |
724 | struct raw3215_info *raw; | |
3ec0a17e | 725 | unsigned int line; |
1da177e4 LT |
726 | |
727 | ccw_device_set_offline(cdev); | |
dff59b64 | 728 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 | 729 | if (raw) { |
3ec0a17e JS |
730 | spin_lock(&raw3215_device_lock); |
731 | for (line = 0; line < NR_3215; line++) | |
732 | if (raw3215[line] == raw) | |
733 | break; | |
734 | raw3215[line] = NULL; | |
735 | spin_unlock(&raw3215_device_lock); | |
dff59b64 | 736 | dev_set_drvdata(&cdev->dev, NULL); |
fe2fc9ca | 737 | raw3215_free_info(raw); |
1da177e4 LT |
738 | } |
739 | } | |
740 | ||
77812a27 | 741 | static int raw3215_set_online (struct ccw_device *cdev) |
1da177e4 LT |
742 | { |
743 | struct raw3215_info *raw; | |
744 | ||
dff59b64 | 745 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
746 | if (!raw) |
747 | return -ENODEV; | |
748 | ||
749 | return raw3215_startup(raw); | |
750 | } | |
751 | ||
77812a27 | 752 | static int raw3215_set_offline (struct ccw_device *cdev) |
1da177e4 LT |
753 | { |
754 | struct raw3215_info *raw; | |
755 | ||
dff59b64 | 756 | raw = dev_get_drvdata(&cdev->dev); |
1da177e4 LT |
757 | if (!raw) |
758 | return -ENODEV; | |
759 | ||
760 | raw3215_shutdown(raw); | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
77812a27 MS |
765 | static int raw3215_pm_stop(struct ccw_device *cdev) |
766 | { | |
767 | struct raw3215_info *raw; | |
768 | unsigned long flags; | |
769 | ||
770 | /* Empty the output buffer, then prevent new I/O. */ | |
4f0076f7 | 771 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 MS |
772 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
773 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); | |
80f02d54 | 774 | tty_port_set_suspended(&raw->port, 1); |
77812a27 MS |
775 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
776 | return 0; | |
777 | } | |
778 | ||
779 | static int raw3215_pm_start(struct ccw_device *cdev) | |
780 | { | |
781 | struct raw3215_info *raw; | |
782 | unsigned long flags; | |
783 | ||
784 | /* Allow I/O again and flush output buffer. */ | |
4f0076f7 | 785 | raw = dev_get_drvdata(&cdev->dev); |
77812a27 | 786 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
80f02d54 | 787 | tty_port_set_suspended(&raw->port, 0); |
77812a27 MS |
788 | raw->flags |= RAW3215_FLUSHING; |
789 | raw3215_try_io(raw); | |
790 | raw->flags &= ~RAW3215_FLUSHING; | |
791 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); | |
792 | return 0; | |
793 | } | |
794 | ||
1da177e4 LT |
795 | static struct ccw_device_id raw3215_id[] = { |
796 | { CCW_DEVICE(0x3215, 0) }, | |
797 | { /* end of list */ }, | |
798 | }; | |
799 | ||
800 | static struct ccw_driver raw3215_ccw_driver = { | |
3bda058b SO |
801 | .driver = { |
802 | .name = "3215", | |
803 | .owner = THIS_MODULE, | |
804 | }, | |
1da177e4 LT |
805 | .ids = raw3215_id, |
806 | .probe = &raw3215_probe, | |
807 | .remove = &raw3215_remove, | |
808 | .set_online = &raw3215_set_online, | |
809 | .set_offline = &raw3215_set_offline, | |
77812a27 MS |
810 | .freeze = &raw3215_pm_stop, |
811 | .thaw = &raw3215_pm_start, | |
812 | .restore = &raw3215_pm_start, | |
420f42ec | 813 | .int_class = IRQIO_C15, |
1da177e4 LT |
814 | }; |
815 | ||
816 | #ifdef CONFIG_TN3215_CONSOLE | |
817 | /* | |
818 | * Write a string to the 3215 console | |
819 | */ | |
77812a27 MS |
820 | static void con3215_write(struct console *co, const char *str, |
821 | unsigned int count) | |
1da177e4 LT |
822 | { |
823 | struct raw3215_info *raw; | |
824 | int i; | |
825 | ||
826 | if (count <= 0) | |
827 | return; | |
828 | raw = raw3215[0]; /* console 3215 is the first one */ | |
829 | while (count > 0) { | |
830 | for (i = 0; i < count; i++) | |
831 | if (str[i] == '\t' || str[i] == '\n') | |
832 | break; | |
833 | raw3215_write(raw, str, i); | |
834 | count -= i; | |
835 | str += i; | |
836 | if (count > 0) { | |
837 | raw3215_putchar(raw, *str); | |
838 | count--; | |
839 | str++; | |
840 | } | |
841 | } | |
842 | } | |
843 | ||
844 | static struct tty_driver *con3215_device(struct console *c, int *index) | |
845 | { | |
846 | *index = c->index; | |
847 | return tty3215_driver; | |
848 | } | |
849 | ||
850 | /* | |
2332ce1a HS |
851 | * panic() calls con3215_flush through a panic_notifier |
852 | * before the system enters a disabled, endless loop. | |
1da177e4 | 853 | */ |
77812a27 | 854 | static void con3215_flush(void) |
1da177e4 LT |
855 | { |
856 | struct raw3215_info *raw; | |
857 | unsigned long flags; | |
858 | ||
859 | raw = raw3215[0]; /* console 3215 is the first one */ | |
80f02d54 | 860 | if (tty_port_suspended(&raw->port)) |
77812a27 | 861 | /* The console is still frozen for suspend. */ |
f10ccca7 | 862 | if (ccw_device_force_console(raw->cdev)) |
77812a27 MS |
863 | /* Forcing didn't work, no panic message .. */ |
864 | return; | |
520a4e37 | 865 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 | 866 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
520a4e37 | 867 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
868 | } |
869 | ||
2332ce1a HS |
870 | static int con3215_notify(struct notifier_block *self, |
871 | unsigned long event, void *data) | |
872 | { | |
873 | con3215_flush(); | |
874 | return NOTIFY_OK; | |
875 | } | |
876 | ||
877 | static struct notifier_block on_panic_nb = { | |
878 | .notifier_call = con3215_notify, | |
879 | .priority = 0, | |
880 | }; | |
881 | ||
882 | static struct notifier_block on_reboot_nb = { | |
883 | .notifier_call = con3215_notify, | |
884 | .priority = 0, | |
885 | }; | |
886 | ||
1da177e4 LT |
887 | /* |
888 | * The console structure for the 3215 console | |
889 | */ | |
890 | static struct console con3215 = { | |
891 | .name = "ttyS", | |
892 | .write = con3215_write, | |
893 | .device = con3215_device, | |
1da177e4 LT |
894 | .flags = CON_PRINTBUFFER, |
895 | }; | |
896 | ||
897 | /* | |
898 | * 3215 console initialization code called from console_init(). | |
1da177e4 | 899 | */ |
77812a27 | 900 | static int __init con3215_init(void) |
1da177e4 LT |
901 | { |
902 | struct ccw_device *cdev; | |
903 | struct raw3215_info *raw; | |
904 | struct raw3215_req *req; | |
905 | int i; | |
906 | ||
907 | /* Check if 3215 is to be the console */ | |
908 | if (!CONSOLE_IS_3215) | |
909 | return -ENODEV; | |
910 | ||
911 | /* Set the console mode for VM */ | |
912 | if (MACHINE_IS_VM) { | |
6b979de3 CB |
913 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
914 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); | |
1da177e4 LT |
915 | } |
916 | ||
917 | /* allocate 3215 request structures */ | |
918 | raw3215_freelist = NULL; | |
919 | spin_lock_init(&raw3215_freelist_lock); | |
920 | for (i = 0; i < NR_3215_REQ; i++) { | |
6d56eee2 | 921 | req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); |
8cb708f3 JL |
922 | if (!req) |
923 | return -ENOMEM; | |
1da177e4 LT |
924 | req->next = raw3215_freelist; |
925 | raw3215_freelist = req; | |
926 | } | |
927 | ||
1e532096 | 928 | cdev = ccw_device_create_console(&raw3215_ccw_driver); |
600b5d16 | 929 | if (IS_ERR(cdev)) |
1da177e4 LT |
930 | return -ENODEV; |
931 | ||
fe2fc9ca | 932 | raw3215[0] = raw = raw3215_alloc_info(); |
1da177e4 | 933 | raw->cdev = cdev; |
dff59b64 | 934 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
935 | cdev->handler = raw3215_irq; |
936 | ||
6673cd0b | 937 | raw->flags |= RAW3215_FIXED; |
1e532096 SO |
938 | if (ccw_device_enable_console(cdev)) { |
939 | ccw_device_destroy_console(cdev); | |
940 | raw3215_free_info(raw); | |
941 | raw3215[0] = NULL; | |
942 | return -ENODEV; | |
943 | } | |
6673cd0b | 944 | |
1da177e4 LT |
945 | /* Request the console irq */ |
946 | if (raw3215_startup(raw) != 0) { | |
fe2fc9ca | 947 | raw3215_free_info(raw); |
1da177e4 | 948 | raw3215[0] = NULL; |
1da177e4 LT |
949 | return -ENODEV; |
950 | } | |
2332ce1a HS |
951 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
952 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
953 | register_console(&con3215); |
954 | return 0; | |
955 | } | |
956 | console_initcall(con3215_init); | |
957 | #endif | |
958 | ||
d2281107 JS |
959 | static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) |
960 | { | |
961 | struct raw3215_info *raw; | |
962 | ||
963 | raw = raw3215[tty->index]; | |
964 | if (raw == NULL) | |
965 | return -ENODEV; | |
966 | ||
967 | tty->driver_data = raw; | |
968 | ||
969 | return tty_port_install(&raw->port, driver, tty); | |
970 | } | |
971 | ||
1da177e4 LT |
972 | /* |
973 | * tty3215_open | |
974 | * | |
975 | * This routine is called whenever a 3215 tty is opened. | |
976 | */ | |
77812a27 | 977 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 | 978 | { |
d2281107 | 979 | struct raw3215_info *raw = tty->driver_data; |
410235fd | 980 | int retval; |
1da177e4 | 981 | |
86b26007 | 982 | tty_port_tty_set(&raw->port, tty); |
1da177e4 | 983 | |
d6c53c0e | 984 | raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ |
1da177e4 LT |
985 | /* |
986 | * Start up 3215 device | |
987 | */ | |
988 | retval = raw3215_startup(raw); | |
989 | if (retval) | |
990 | return retval; | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | /* | |
996 | * tty3215_close() | |
997 | * | |
998 | * This routine is called when the 3215 tty is closed. We wait | |
999 | * for the remaining request to be completed. Then we clean up. | |
1000 | */ | |
77812a27 | 1001 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
1002 | { |
1003 | struct raw3215_info *raw; | |
1004 | ||
1005 | raw = (struct raw3215_info *) tty->driver_data; | |
1006 | if (raw == NULL || tty->count > 1) | |
1007 | return; | |
1008 | tty->closing = 1; | |
1009 | /* Shutdown the terminal */ | |
1010 | raw3215_shutdown(raw); | |
656d9125 | 1011 | tasklet_kill(&raw->tlet); |
1da177e4 | 1012 | tty->closing = 0; |
86b26007 | 1013 | tty_port_tty_set(&raw->port, NULL); |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | /* | |
1017 | * Returns the amount of free space in the output buffer. | |
1018 | */ | |
77812a27 | 1019 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
1020 | { |
1021 | struct raw3215_info *raw; | |
1022 | ||
1023 | raw = (struct raw3215_info *) tty->driver_data; | |
1024 | ||
1025 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
1026 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
1027 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
1028 | else | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * String write routine for 3215 ttys | |
1034 | */ | |
77812a27 MS |
1035 | static int tty3215_write(struct tty_struct * tty, |
1036 | const unsigned char *buf, int count) | |
1da177e4 LT |
1037 | { |
1038 | struct raw3215_info *raw; | |
e512d56c | 1039 | int i, written; |
1da177e4 LT |
1040 | |
1041 | if (!tty) | |
1042 | return 0; | |
1043 | raw = (struct raw3215_info *) tty->driver_data; | |
e512d56c MS |
1044 | written = count; |
1045 | while (count > 0) { | |
1046 | for (i = 0; i < count; i++) | |
1047 | if (buf[i] == '\t' || buf[i] == '\n') | |
1048 | break; | |
1049 | raw3215_write(raw, buf, i); | |
1050 | count -= i; | |
1051 | buf += i; | |
1052 | if (count > 0) { | |
1053 | raw3215_putchar(raw, *buf); | |
1054 | count--; | |
1055 | buf++; | |
1056 | } | |
1057 | } | |
1058 | return written; | |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | /* | |
1062 | * Put character routine for 3215 ttys | |
1063 | */ | |
77812a27 | 1064 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1065 | { |
1066 | struct raw3215_info *raw; | |
1067 | ||
1068 | if (!tty) | |
9e7c9a19 | 1069 | return 0; |
1da177e4 LT |
1070 | raw = (struct raw3215_info *) tty->driver_data; |
1071 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1072 | return 1; |
1da177e4 LT |
1073 | } |
1074 | ||
77812a27 | 1075 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1076 | { |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Returns the number of characters in the output buffer | |
1081 | */ | |
77812a27 | 1082 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1083 | { |
1084 | struct raw3215_info *raw; | |
1085 | ||
1086 | raw = (struct raw3215_info *) tty->driver_data; | |
1087 | return raw->count; | |
1088 | } | |
1089 | ||
77812a27 | 1090 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1091 | { |
1092 | struct raw3215_info *raw; | |
1093 | ||
1094 | raw = (struct raw3215_info *) tty->driver_data; | |
1095 | raw3215_flush_buffer(raw); | |
1096 | tty_wakeup(tty); | |
1097 | } | |
1098 | ||
1da177e4 LT |
1099 | /* |
1100 | * Disable reading from a 3215 tty | |
1101 | */ | |
77812a27 | 1102 | static void tty3215_throttle(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_THROTTLED; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Enable reading from a 3215 tty | |
1112 | */ | |
77812a27 | 1113 | static void tty3215_unthrottle(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_THROTTLED) { | |
520a4e37 | 1120 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1121 | raw->flags &= ~RAW3215_THROTTLED; |
1122 | raw3215_try_io(raw); | |
520a4e37 | 1123 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1124 | } |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Disable writing to a 3215 tty | |
1129 | */ | |
77812a27 | 1130 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1131 | { |
1132 | struct raw3215_info *raw; | |
1133 | ||
1134 | raw = (struct raw3215_info *) tty->driver_data; | |
1135 | raw->flags |= RAW3215_STOPPED; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Enable writing to a 3215 tty | |
1140 | */ | |
77812a27 | 1141 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1142 | { |
1143 | struct raw3215_info *raw; | |
1144 | unsigned long flags; | |
1145 | ||
1146 | raw = (struct raw3215_info *) tty->driver_data; | |
1147 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1148 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1149 | raw->flags &= ~RAW3215_STOPPED; |
1150 | raw3215_try_io(raw); | |
520a4e37 | 1151 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1152 | } |
1153 | } | |
1154 | ||
b68e31d0 | 1155 | static const struct tty_operations tty3215_ops = { |
d2281107 | 1156 | .install = tty3215_install, |
1da177e4 LT |
1157 | .open = tty3215_open, |
1158 | .close = tty3215_close, | |
1159 | .write = tty3215_write, | |
1160 | .put_char = tty3215_put_char, | |
1161 | .flush_chars = tty3215_flush_chars, | |
1162 | .write_room = tty3215_write_room, | |
1163 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1164 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1165 | .throttle = tty3215_throttle, |
1166 | .unthrottle = tty3215_unthrottle, | |
1167 | .stop = tty3215_stop, | |
1168 | .start = tty3215_start, | |
1169 | }; | |
1170 | ||
1171 | /* | |
1172 | * 3215 tty registration code called from tty_init(). | |
1173 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1174 | */ | |
77812a27 | 1175 | static int __init tty3215_init(void) |
1da177e4 LT |
1176 | { |
1177 | struct tty_driver *driver; | |
1178 | int ret; | |
1179 | ||
1180 | if (!CONSOLE_IS_3215) | |
1181 | return 0; | |
1182 | ||
1183 | driver = alloc_tty_driver(NR_3215); | |
1184 | if (!driver) | |
1185 | return -ENOMEM; | |
1186 | ||
1187 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1188 | if (ret) { | |
1189 | put_tty_driver(driver); | |
1190 | return ret; | |
1191 | } | |
1192 | /* | |
1193 | * Initialize the tty_driver structure | |
1194 | * Entries in tty3215_driver that are NOT initialized: | |
1195 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1196 | */ | |
1197 | ||
1da177e4 LT |
1198 | driver->driver_name = "tty3215"; |
1199 | driver->name = "ttyS"; | |
1200 | driver->major = TTY_MAJOR; | |
1201 | driver->minor_start = 64; | |
1202 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1203 | driver->subtype = SYSTEM_TYPE_TTY; | |
1204 | driver->init_termios = tty_std_termios; | |
1205 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
e512d56c | 1206 | driver->init_termios.c_oflag = ONLCR; |
1da177e4 LT |
1207 | driver->init_termios.c_lflag = ISIG; |
1208 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1209 | tty_set_operations(driver, &tty3215_ops); | |
1210 | ret = tty_register_driver(driver); | |
1211 | if (ret) { | |
1da177e4 LT |
1212 | put_tty_driver(driver); |
1213 | return ret; | |
1214 | } | |
1215 | tty3215_driver = driver; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
77812a27 | 1219 | static void __exit tty3215_exit(void) |
1da177e4 LT |
1220 | { |
1221 | tty_unregister_driver(tty3215_driver); | |
1222 | put_tty_driver(tty3215_driver); | |
1223 | ccw_driver_unregister(&raw3215_ccw_driver); | |
1224 | } | |
1225 | ||
1226 | module_init(tty3215_init); | |
1227 | module_exit(tty3215_exit); |