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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/types.h> |
13 | #include <linux/kdev_t.h> | |
14 | #include <linux/tty.h> | |
33f0f88f | 15 | #include <linux/tty_flip.h> |
1da177e4 LT |
16 | #include <linux/vt_kern.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/console.h> | |
19 | #include <linux/interrupt.h> | |
600b5d16 | 20 | #include <linux/err.h> |
2332ce1a | 21 | #include <linux/reboot.h> |
8dd360f0 | 22 | #include <linux/serial.h> /* ASYNC_* flags */ |
1da177e4 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | #include <asm/ccwdev.h> |
25 | #include <asm/cio.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/ebcdic.h> | |
7c0f6ba6 | 28 | #include <linux/uaccess.h> |
1da177e4 LT |
29 | #include <asm/delay.h> |
30 | #include <asm/cpcmd.h> | |
31 | #include <asm/setup.h> | |
32 | ||
33 | #include "ctrlchar.h" | |
34 | ||
35 | #define NR_3215 1 | |
36 | #define NR_3215_REQ (4*NR_3215) | |
37 | #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ | |
38 | #define RAW3215_INBUF_SIZE 256 /* input buffer size */ | |
39 | #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ | |
40 | #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ | |
41 | #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ | |
42 | #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ | |
43 | #define RAW3215_NR_CCWS 3 | |
44 | #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ | |
45 | ||
6673cd0b | 46 | #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ |
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); |
26d766c6 | 290 | raw->flags &= ~RAW3215_TIMER_RUNS; |
80f02d54 | 291 | if (!tty_port_suspended(&raw->port)) { |
26d766c6 MS |
292 | raw3215_mk_write_req(raw); |
293 | raw3215_start_io(raw); | |
294 | if ((raw->queued_read || raw->queued_write) && | |
295 | !(raw->flags & RAW3215_WORKING) && | |
296 | !(raw->flags & RAW3215_TIMER_RUNS)) { | |
297 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
298 | add_timer(&raw->timer); | |
299 | raw->flags |= RAW3215_TIMER_RUNS; | |
77812a27 | 300 | } |
1da177e4 | 301 | } |
520a4e37 | 302 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
303 | } |
304 | ||
305 | /* | |
306 | * Function to conditionally start an IO. A read is started immediately, | |
307 | * a write is only started immediately if the flush flag is on or the | |
308 | * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not | |
309 | * done immediately a timer is started with a delay of RAW3215_TIMEOUT. | |
310 | */ | |
77812a27 | 311 | static inline void raw3215_try_io(struct raw3215_info *raw) |
1da177e4 | 312 | { |
d41861ca | 313 | if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port)) |
1da177e4 LT |
314 | return; |
315 | if (raw->queued_read != NULL) | |
316 | raw3215_start_io(raw); | |
317 | else if (raw->queued_write != NULL) { | |
318 | if ((raw->queued_write->delayable == 0) || | |
319 | (raw->flags & RAW3215_FLUSHING)) { | |
320 | /* execute write requests bigger than minimum size */ | |
321 | raw3215_start_io(raw); | |
1da177e4 LT |
322 | } |
323 | } | |
26d766c6 MS |
324 | if ((raw->queued_read || raw->queued_write) && |
325 | !(raw->flags & RAW3215_WORKING) && | |
326 | !(raw->flags & RAW3215_TIMER_RUNS)) { | |
327 | raw->timer.expires = RAW3215_TIMEOUT + jiffies; | |
328 | add_timer(&raw->timer); | |
329 | raw->flags |= RAW3215_TIMER_RUNS; | |
330 | } | |
1da177e4 LT |
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. */ | |
80f02d54 | 495 | if (tty_port_suspended(&raw->port)) { |
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 | |
188561a4 | 505 | ccw_device_wait_idle(raw->cdev); |
1da177e4 LT |
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 | ||
d41861ca | 617 | if (tty_port_initialized(&raw->port)) |
1da177e4 LT |
618 | return 0; |
619 | raw->line_pos = 0; | |
d41861ca | 620 | tty_port_set_initialized(&raw->port, 1); |
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 | ||
d41861ca | 636 | if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) |
1da177e4 LT |
637 | return; |
638 | /* Wait for outstanding requests, then free irq */ | |
520a4e37 | 639 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
640 | if ((raw->flags & RAW3215_WORKING) || |
641 | raw->queued_write != NULL || | |
642 | raw->queued_read != NULL) { | |
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); | |
d41861ca | 650 | tty_port_set_initialized(&raw->port, 1); |
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) { | |
0a7c501e CJ |
666 | kfree(info->inbuf); |
667 | kfree(info->buffer); | |
fe2fc9ca JS |
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); | |
80f02d54 | 773 | tty_port_set_suspended(&raw->port, 1); |
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); |
80f02d54 | 786 | tty_port_set_suspended(&raw->port, 0); |
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 */ | |
80f02d54 | 859 | if (tty_port_suspended(&raw->port)) |
77812a27 | 860 | /* The console is still frozen for suspend. */ |
f10ccca7 | 861 | if (ccw_device_force_console(raw->cdev)) |
77812a27 MS |
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); |
8cb708f3 JL |
921 | if (!req) |
922 | return -ENOMEM; | |
1da177e4 LT |
923 | req->next = raw3215_freelist; |
924 | raw3215_freelist = req; | |
925 | } | |
926 | ||
1e532096 | 927 | cdev = ccw_device_create_console(&raw3215_ccw_driver); |
600b5d16 | 928 | if (IS_ERR(cdev)) |
1da177e4 LT |
929 | return -ENODEV; |
930 | ||
fe2fc9ca | 931 | raw3215[0] = raw = raw3215_alloc_info(); |
1da177e4 | 932 | raw->cdev = cdev; |
dff59b64 | 933 | dev_set_drvdata(&cdev->dev, raw); |
1da177e4 LT |
934 | cdev->handler = raw3215_irq; |
935 | ||
6673cd0b | 936 | raw->flags |= RAW3215_FIXED; |
1e532096 SO |
937 | if (ccw_device_enable_console(cdev)) { |
938 | ccw_device_destroy_console(cdev); | |
939 | raw3215_free_info(raw); | |
940 | raw3215[0] = NULL; | |
941 | return -ENODEV; | |
942 | } | |
6673cd0b | 943 | |
1da177e4 LT |
944 | /* Request the console irq */ |
945 | if (raw3215_startup(raw) != 0) { | |
fe2fc9ca | 946 | raw3215_free_info(raw); |
1da177e4 | 947 | raw3215[0] = NULL; |
1da177e4 LT |
948 | return -ENODEV; |
949 | } | |
2332ce1a HS |
950 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
951 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
952 | register_console(&con3215); |
953 | return 0; | |
954 | } | |
955 | console_initcall(con3215_init); | |
956 | #endif | |
957 | ||
d2281107 JS |
958 | static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) |
959 | { | |
960 | struct raw3215_info *raw; | |
961 | ||
962 | raw = raw3215[tty->index]; | |
963 | if (raw == NULL) | |
964 | return -ENODEV; | |
965 | ||
966 | tty->driver_data = raw; | |
967 | ||
968 | return tty_port_install(&raw->port, driver, tty); | |
969 | } | |
970 | ||
1da177e4 LT |
971 | /* |
972 | * tty3215_open | |
973 | * | |
974 | * This routine is called whenever a 3215 tty is opened. | |
975 | */ | |
77812a27 | 976 | static int tty3215_open(struct tty_struct *tty, struct file * filp) |
1da177e4 | 977 | { |
d2281107 | 978 | struct raw3215_info *raw = tty->driver_data; |
410235fd | 979 | int retval; |
1da177e4 | 980 | |
86b26007 | 981 | tty_port_tty_set(&raw->port, tty); |
1da177e4 | 982 | |
d6c53c0e | 983 | raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ |
1da177e4 LT |
984 | /* |
985 | * Start up 3215 device | |
986 | */ | |
987 | retval = raw3215_startup(raw); | |
988 | if (retval) | |
989 | return retval; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | /* | |
995 | * tty3215_close() | |
996 | * | |
997 | * This routine is called when the 3215 tty is closed. We wait | |
998 | * for the remaining request to be completed. Then we clean up. | |
999 | */ | |
77812a27 | 1000 | static void tty3215_close(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
1001 | { |
1002 | struct raw3215_info *raw; | |
1003 | ||
1004 | raw = (struct raw3215_info *) tty->driver_data; | |
1005 | if (raw == NULL || tty->count > 1) | |
1006 | return; | |
1007 | tty->closing = 1; | |
1008 | /* Shutdown the terminal */ | |
1009 | raw3215_shutdown(raw); | |
656d9125 | 1010 | tasklet_kill(&raw->tlet); |
1da177e4 | 1011 | tty->closing = 0; |
86b26007 | 1012 | tty_port_tty_set(&raw->port, NULL); |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | /* | |
1016 | * Returns the amount of free space in the output buffer. | |
1017 | */ | |
77812a27 | 1018 | static int tty3215_write_room(struct tty_struct *tty) |
1da177e4 LT |
1019 | { |
1020 | struct raw3215_info *raw; | |
1021 | ||
1022 | raw = (struct raw3215_info *) tty->driver_data; | |
1023 | ||
1024 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ | |
1025 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) | |
1026 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; | |
1027 | else | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * String write routine for 3215 ttys | |
1033 | */ | |
77812a27 MS |
1034 | static int tty3215_write(struct tty_struct * tty, |
1035 | const unsigned char *buf, int count) | |
1da177e4 LT |
1036 | { |
1037 | struct raw3215_info *raw; | |
e512d56c | 1038 | int i, written; |
1da177e4 LT |
1039 | |
1040 | if (!tty) | |
1041 | return 0; | |
1042 | raw = (struct raw3215_info *) tty->driver_data; | |
e512d56c MS |
1043 | written = count; |
1044 | while (count > 0) { | |
1045 | for (i = 0; i < count; i++) | |
1046 | if (buf[i] == '\t' || buf[i] == '\n') | |
1047 | break; | |
1048 | raw3215_write(raw, buf, i); | |
1049 | count -= i; | |
1050 | buf += i; | |
1051 | if (count > 0) { | |
1052 | raw3215_putchar(raw, *buf); | |
1053 | count--; | |
1054 | buf++; | |
1055 | } | |
1056 | } | |
1057 | return written; | |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | /* | |
1061 | * Put character routine for 3215 ttys | |
1062 | */ | |
77812a27 | 1063 | static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
1064 | { |
1065 | struct raw3215_info *raw; | |
1066 | ||
1067 | if (!tty) | |
9e7c9a19 | 1068 | return 0; |
1da177e4 LT |
1069 | raw = (struct raw3215_info *) tty->driver_data; |
1070 | raw3215_putchar(raw, ch); | |
9e7c9a19 | 1071 | return 1; |
1da177e4 LT |
1072 | } |
1073 | ||
77812a27 | 1074 | static void tty3215_flush_chars(struct tty_struct *tty) |
1da177e4 LT |
1075 | { |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Returns the number of characters in the output buffer | |
1080 | */ | |
77812a27 | 1081 | static int tty3215_chars_in_buffer(struct tty_struct *tty) |
1da177e4 LT |
1082 | { |
1083 | struct raw3215_info *raw; | |
1084 | ||
1085 | raw = (struct raw3215_info *) tty->driver_data; | |
1086 | return raw->count; | |
1087 | } | |
1088 | ||
77812a27 | 1089 | static void tty3215_flush_buffer(struct tty_struct *tty) |
1da177e4 LT |
1090 | { |
1091 | struct raw3215_info *raw; | |
1092 | ||
1093 | raw = (struct raw3215_info *) tty->driver_data; | |
1094 | raw3215_flush_buffer(raw); | |
1095 | tty_wakeup(tty); | |
1096 | } | |
1097 | ||
1da177e4 LT |
1098 | /* |
1099 | * Disable reading from a 3215 tty | |
1100 | */ | |
77812a27 | 1101 | static void tty3215_throttle(struct tty_struct * tty) |
1da177e4 LT |
1102 | { |
1103 | struct raw3215_info *raw; | |
1104 | ||
1105 | raw = (struct raw3215_info *) tty->driver_data; | |
1106 | raw->flags |= RAW3215_THROTTLED; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Enable reading from a 3215 tty | |
1111 | */ | |
77812a27 | 1112 | static void tty3215_unthrottle(struct tty_struct * tty) |
1da177e4 LT |
1113 | { |
1114 | struct raw3215_info *raw; | |
1115 | unsigned long flags; | |
1116 | ||
1117 | raw = (struct raw3215_info *) tty->driver_data; | |
1118 | if (raw->flags & RAW3215_THROTTLED) { | |
520a4e37 | 1119 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1120 | raw->flags &= ~RAW3215_THROTTLED; |
1121 | raw3215_try_io(raw); | |
520a4e37 | 1122 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1123 | } |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Disable writing to a 3215 tty | |
1128 | */ | |
77812a27 | 1129 | static void tty3215_stop(struct tty_struct *tty) |
1da177e4 LT |
1130 | { |
1131 | struct raw3215_info *raw; | |
1132 | ||
1133 | raw = (struct raw3215_info *) tty->driver_data; | |
1134 | raw->flags |= RAW3215_STOPPED; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Enable writing to a 3215 tty | |
1139 | */ | |
77812a27 | 1140 | static void tty3215_start(struct tty_struct *tty) |
1da177e4 LT |
1141 | { |
1142 | struct raw3215_info *raw; | |
1143 | unsigned long flags; | |
1144 | ||
1145 | raw = (struct raw3215_info *) tty->driver_data; | |
1146 | if (raw->flags & RAW3215_STOPPED) { | |
520a4e37 | 1147 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1148 | raw->flags &= ~RAW3215_STOPPED; |
1149 | raw3215_try_io(raw); | |
520a4e37 | 1150 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
1da177e4 LT |
1151 | } |
1152 | } | |
1153 | ||
b68e31d0 | 1154 | static const struct tty_operations tty3215_ops = { |
d2281107 | 1155 | .install = tty3215_install, |
1da177e4 LT |
1156 | .open = tty3215_open, |
1157 | .close = tty3215_close, | |
1158 | .write = tty3215_write, | |
1159 | .put_char = tty3215_put_char, | |
1160 | .flush_chars = tty3215_flush_chars, | |
1161 | .write_room = tty3215_write_room, | |
1162 | .chars_in_buffer = tty3215_chars_in_buffer, | |
1163 | .flush_buffer = tty3215_flush_buffer, | |
1da177e4 LT |
1164 | .throttle = tty3215_throttle, |
1165 | .unthrottle = tty3215_unthrottle, | |
1166 | .stop = tty3215_stop, | |
1167 | .start = tty3215_start, | |
1168 | }; | |
1169 | ||
1170 | /* | |
1171 | * 3215 tty registration code called from tty_init(). | |
1172 | * Most kernel services (incl. kmalloc) are available at this poimt. | |
1173 | */ | |
77812a27 | 1174 | static int __init tty3215_init(void) |
1da177e4 LT |
1175 | { |
1176 | struct tty_driver *driver; | |
1177 | int ret; | |
1178 | ||
1179 | if (!CONSOLE_IS_3215) | |
1180 | return 0; | |
1181 | ||
1182 | driver = alloc_tty_driver(NR_3215); | |
1183 | if (!driver) | |
1184 | return -ENOMEM; | |
1185 | ||
1186 | ret = ccw_driver_register(&raw3215_ccw_driver); | |
1187 | if (ret) { | |
1188 | put_tty_driver(driver); | |
1189 | return ret; | |
1190 | } | |
1191 | /* | |
1192 | * Initialize the tty_driver structure | |
1193 | * Entries in tty3215_driver that are NOT initialized: | |
1194 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc | |
1195 | */ | |
1196 | ||
1da177e4 LT |
1197 | driver->driver_name = "tty3215"; |
1198 | driver->name = "ttyS"; | |
1199 | driver->major = TTY_MAJOR; | |
1200 | driver->minor_start = 64; | |
1201 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1202 | driver->subtype = SYSTEM_TYPE_TTY; | |
1203 | driver->init_termios = tty_std_termios; | |
1204 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; | |
e512d56c | 1205 | driver->init_termios.c_oflag = ONLCR; |
1da177e4 LT |
1206 | driver->init_termios.c_lflag = ISIG; |
1207 | driver->flags = TTY_DRIVER_REAL_RAW; | |
1208 | tty_set_operations(driver, &tty3215_ops); | |
1209 | ret = tty_register_driver(driver); | |
1210 | if (ret) { | |
1da177e4 LT |
1211 | put_tty_driver(driver); |
1212 | return ret; | |
1213 | } | |
1214 | tty3215_driver = driver; | |
1215 | return 0; | |
1216 | } | |
6e4c1d84 | 1217 | device_initcall(tty3215_init); |