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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
62b74942 | 2 | * SCLP VT220 terminal driver. |
1da177e4 | 3 | * |
62b74942 MH |
4 | * Copyright IBM Corp. 2003, 2009 |
5 | * | |
6 | * Author(s): Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com> | |
1da177e4 LT |
7 | */ |
8 | ||
1da177e4 LT |
9 | #include <linux/module.h> |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/list.h> | |
12 | #include <linux/wait.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/kernel.h> | |
1d3f9094 | 15 | #include <linux/sysrq.h> |
1da177e4 LT |
16 | #include <linux/tty.h> |
17 | #include <linux/tty_driver.h> | |
33f0f88f | 18 | #include <linux/tty_flip.h> |
1da177e4 LT |
19 | #include <linux/errno.h> |
20 | #include <linux/mm.h> | |
21 | #include <linux/major.h> | |
22 | #include <linux/console.h> | |
23 | #include <linux/kdev_t.h> | |
1da177e4 LT |
24 | #include <linux/interrupt.h> |
25 | #include <linux/init.h> | |
2332ce1a | 26 | #include <linux/reboot.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
2332ce1a | 28 | |
7c0f6ba6 | 29 | #include <linux/uaccess.h> |
1da177e4 | 30 | #include "sclp.h" |
1d3f9094 | 31 | #include "ctrlchar.h" |
1da177e4 | 32 | |
1da177e4 LT |
33 | #define SCLP_VT220_MAJOR TTY_MAJOR |
34 | #define SCLP_VT220_MINOR 65 | |
35 | #define SCLP_VT220_DRIVER_NAME "sclp_vt220" | |
36 | #define SCLP_VT220_DEVICE_NAME "ttysclp" | |
37 | #define SCLP_VT220_CONSOLE_NAME "ttyS" | |
38 | #define SCLP_VT220_CONSOLE_INDEX 1 /* console=ttyS1 */ | |
1da177e4 LT |
39 | |
40 | /* Representation of a single write request */ | |
41 | struct sclp_vt220_request { | |
42 | struct list_head list; | |
43 | struct sclp_req sclp_req; | |
44 | int retry_count; | |
45 | }; | |
46 | ||
47 | /* VT220 SCCB */ | |
48 | struct sclp_vt220_sccb { | |
49 | struct sccb_header header; | |
50 | struct evbuf_header evbuf; | |
51 | }; | |
52 | ||
53 | #define SCLP_VT220_MAX_CHARS_PER_BUFFER (PAGE_SIZE - \ | |
54 | sizeof(struct sclp_vt220_request) - \ | |
55 | sizeof(struct sclp_vt220_sccb)) | |
56 | ||
57 | /* Structures and data needed to register tty driver */ | |
58 | static struct tty_driver *sclp_vt220_driver; | |
59 | ||
092f7377 | 60 | static struct tty_port sclp_vt220_port; |
1da177e4 LT |
61 | |
62 | /* Lock to protect internal data from concurrent access */ | |
63 | static spinlock_t sclp_vt220_lock; | |
64 | ||
65 | /* List of empty pages to be used as write request buffers */ | |
66 | static struct list_head sclp_vt220_empty; | |
67 | ||
68 | /* List of pending requests */ | |
69 | static struct list_head sclp_vt220_outqueue; | |
70 | ||
62b74942 MH |
71 | /* Suspend mode flag */ |
72 | static int sclp_vt220_suspended; | |
73 | ||
74 | /* Flag that output queue is currently running */ | |
75 | static int sclp_vt220_queue_running; | |
1da177e4 | 76 | |
1da177e4 LT |
77 | /* Timer used for delaying write requests to merge subsequent messages into |
78 | * a single buffer */ | |
79 | static struct timer_list sclp_vt220_timer; | |
80 | ||
81 | /* Pointer to current request buffer which has been partially filled but not | |
82 | * yet sent */ | |
83 | static struct sclp_vt220_request *sclp_vt220_current_request; | |
84 | ||
85 | /* Number of characters in current request buffer */ | |
86 | static int sclp_vt220_buffered_chars; | |
87 | ||
ad211790 PO |
88 | /* Counter controlling core driver initialization. */ |
89 | static int __initdata sclp_vt220_init_count; | |
1da177e4 LT |
90 | |
91 | /* Flag indicating that sclp_vt220_current_request should really | |
92 | * have been already queued but wasn't because the SCLP was processing | |
93 | * another buffer */ | |
94 | static int sclp_vt220_flush_later; | |
95 | ||
96 | static void sclp_vt220_receiver_fn(struct evbuf_header *evbuf); | |
62b74942 MH |
97 | static void sclp_vt220_pm_event_fn(struct sclp_register *reg, |
98 | enum sclp_pm_event sclp_pm_event); | |
1da177e4 LT |
99 | static int __sclp_vt220_emit(struct sclp_vt220_request *request); |
100 | static void sclp_vt220_emit_current(void); | |
101 | ||
e106e4ea | 102 | /* Registration structure for SCLP output event buffers */ |
1da177e4 | 103 | static struct sclp_register sclp_vt220_register = { |
6d4740c8 | 104 | .send_mask = EVTYP_VT220MSG_MASK, |
e106e4ea PO |
105 | .pm_event_fn = sclp_vt220_pm_event_fn, |
106 | }; | |
107 | ||
108 | /* Registration structure for SCLP input event buffers */ | |
109 | static struct sclp_register sclp_vt220_register_input = { | |
6d4740c8 | 110 | .receive_mask = EVTYP_VT220MSG_MASK, |
62b74942 | 111 | .receiver_fn = sclp_vt220_receiver_fn, |
1da177e4 LT |
112 | }; |
113 | ||
114 | ||
115 | /* | |
116 | * Put provided request buffer back into queue and check emit pending | |
117 | * buffers if necessary. | |
118 | */ | |
119 | static void | |
120 | sclp_vt220_process_queue(struct sclp_vt220_request *request) | |
121 | { | |
122 | unsigned long flags; | |
123 | void *page; | |
124 | ||
125 | do { | |
126 | /* Put buffer back to list of empty buffers */ | |
127 | page = request->sclp_req.sccb; | |
128 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
129 | /* Move request from outqueue to empty queue */ | |
130 | list_del(&request->list); | |
1da177e4 LT |
131 | list_add_tail((struct list_head *) page, &sclp_vt220_empty); |
132 | /* Check if there is a pending buffer on the out queue. */ | |
133 | request = NULL; | |
134 | if (!list_empty(&sclp_vt220_outqueue)) | |
135 | request = list_entry(sclp_vt220_outqueue.next, | |
136 | struct sclp_vt220_request, list); | |
62b74942 MH |
137 | if (!request || sclp_vt220_suspended) { |
138 | sclp_vt220_queue_running = 0; | |
139 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
140 | break; | |
141 | } | |
1da177e4 | 142 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
62b74942 | 143 | } while (__sclp_vt220_emit(request)); |
1da177e4 LT |
144 | if (request == NULL && sclp_vt220_flush_later) |
145 | sclp_vt220_emit_current(); | |
6aad04f2 | 146 | tty_port_tty_wakeup(&sclp_vt220_port); |
1da177e4 LT |
147 | } |
148 | ||
149 | #define SCLP_BUFFER_MAX_RETRY 1 | |
150 | ||
151 | /* | |
152 | * Callback through which the result of a write request is reported by the | |
153 | * SCLP. | |
154 | */ | |
155 | static void | |
156 | sclp_vt220_callback(struct sclp_req *request, void *data) | |
157 | { | |
158 | struct sclp_vt220_request *vt220_request; | |
159 | struct sclp_vt220_sccb *sccb; | |
160 | ||
161 | vt220_request = (struct sclp_vt220_request *) data; | |
162 | if (request->status == SCLP_REQ_FAILED) { | |
163 | sclp_vt220_process_queue(vt220_request); | |
164 | return; | |
165 | } | |
166 | sccb = (struct sclp_vt220_sccb *) vt220_request->sclp_req.sccb; | |
167 | ||
168 | /* Check SCLP response code and choose suitable action */ | |
169 | switch (sccb->header.response_code) { | |
170 | case 0x0020 : | |
171 | break; | |
172 | ||
173 | case 0x05f0: /* Target resource in improper state */ | |
174 | break; | |
175 | ||
176 | case 0x0340: /* Contained SCLP equipment check */ | |
177 | if (++vt220_request->retry_count > SCLP_BUFFER_MAX_RETRY) | |
178 | break; | |
179 | /* Remove processed buffers and requeue rest */ | |
180 | if (sclp_remove_processed((struct sccb_header *) sccb) > 0) { | |
181 | /* Not all buffers were processed */ | |
182 | sccb->header.response_code = 0x0000; | |
183 | vt220_request->sclp_req.status = SCLP_REQ_FILLED; | |
184 | if (sclp_add_request(request) == 0) | |
185 | return; | |
186 | } | |
187 | break; | |
188 | ||
189 | case 0x0040: /* SCLP equipment check */ | |
190 | if (++vt220_request->retry_count > SCLP_BUFFER_MAX_RETRY) | |
191 | break; | |
192 | sccb->header.response_code = 0x0000; | |
193 | vt220_request->sclp_req.status = SCLP_REQ_FILLED; | |
194 | if (sclp_add_request(request) == 0) | |
195 | return; | |
196 | break; | |
197 | ||
198 | default: | |
199 | break; | |
200 | } | |
201 | sclp_vt220_process_queue(vt220_request); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Emit vt220 request buffer to SCLP. Return zero on success, non-zero | |
206 | * otherwise. | |
207 | */ | |
208 | static int | |
209 | __sclp_vt220_emit(struct sclp_vt220_request *request) | |
210 | { | |
ab14de6c | 211 | request->sclp_req.command = SCLP_CMDW_WRITE_EVENT_DATA; |
1da177e4 LT |
212 | request->sclp_req.status = SCLP_REQ_FILLED; |
213 | request->sclp_req.callback = sclp_vt220_callback; | |
214 | request->sclp_req.callback_data = (void *) request; | |
215 | ||
216 | return sclp_add_request(&request->sclp_req); | |
217 | } | |
218 | ||
219 | /* | |
62b74942 | 220 | * Queue and emit current request. |
1da177e4 LT |
221 | */ |
222 | static void | |
223 | sclp_vt220_emit_current(void) | |
224 | { | |
225 | unsigned long flags; | |
226 | struct sclp_vt220_request *request; | |
227 | struct sclp_vt220_sccb *sccb; | |
228 | ||
229 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
62b74942 | 230 | if (sclp_vt220_current_request) { |
1da177e4 LT |
231 | sccb = (struct sclp_vt220_sccb *) |
232 | sclp_vt220_current_request->sclp_req.sccb; | |
233 | /* Only emit buffers with content */ | |
234 | if (sccb->header.length != sizeof(struct sclp_vt220_sccb)) { | |
62b74942 MH |
235 | list_add_tail(&sclp_vt220_current_request->list, |
236 | &sclp_vt220_outqueue); | |
1da177e4 LT |
237 | sclp_vt220_current_request = NULL; |
238 | if (timer_pending(&sclp_vt220_timer)) | |
239 | del_timer(&sclp_vt220_timer); | |
240 | } | |
241 | sclp_vt220_flush_later = 0; | |
242 | } | |
62b74942 MH |
243 | if (sclp_vt220_queue_running || sclp_vt220_suspended) |
244 | goto out_unlock; | |
245 | if (list_empty(&sclp_vt220_outqueue)) | |
246 | goto out_unlock; | |
247 | request = list_first_entry(&sclp_vt220_outqueue, | |
248 | struct sclp_vt220_request, list); | |
249 | sclp_vt220_queue_running = 1; | |
250 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
251 | ||
252 | if (__sclp_vt220_emit(request)) | |
253 | sclp_vt220_process_queue(request); | |
254 | return; | |
255 | out_unlock: | |
1da177e4 | 256 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
1da177e4 LT |
257 | } |
258 | ||
259 | #define SCLP_NORMAL_WRITE 0x00 | |
260 | ||
261 | /* | |
262 | * Helper function to initialize a page with the sclp request structure. | |
263 | */ | |
264 | static struct sclp_vt220_request * | |
265 | sclp_vt220_initialize_page(void *page) | |
266 | { | |
267 | struct sclp_vt220_request *request; | |
268 | struct sclp_vt220_sccb *sccb; | |
269 | ||
270 | /* Place request structure at end of page */ | |
271 | request = ((struct sclp_vt220_request *) | |
272 | ((addr_t) page + PAGE_SIZE)) - 1; | |
273 | request->retry_count = 0; | |
274 | request->sclp_req.sccb = page; | |
275 | /* SCCB goes at start of page */ | |
276 | sccb = (struct sclp_vt220_sccb *) page; | |
277 | memset((void *) sccb, 0, sizeof(struct sclp_vt220_sccb)); | |
278 | sccb->header.length = sizeof(struct sclp_vt220_sccb); | |
279 | sccb->header.function_code = SCLP_NORMAL_WRITE; | |
280 | sccb->header.response_code = 0x0000; | |
6d4740c8 | 281 | sccb->evbuf.type = EVTYP_VT220MSG; |
1da177e4 LT |
282 | sccb->evbuf.length = sizeof(struct evbuf_header); |
283 | ||
284 | return request; | |
285 | } | |
286 | ||
287 | static inline unsigned int | |
288 | sclp_vt220_space_left(struct sclp_vt220_request *request) | |
289 | { | |
290 | struct sclp_vt220_sccb *sccb; | |
291 | sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; | |
292 | return PAGE_SIZE - sizeof(struct sclp_vt220_request) - | |
293 | sccb->header.length; | |
294 | } | |
295 | ||
296 | static inline unsigned int | |
297 | sclp_vt220_chars_stored(struct sclp_vt220_request *request) | |
298 | { | |
299 | struct sclp_vt220_sccb *sccb; | |
300 | sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; | |
301 | return sccb->evbuf.length - sizeof(struct evbuf_header); | |
302 | } | |
303 | ||
304 | /* | |
305 | * Add msg to buffer associated with request. Return the number of characters | |
306 | * added. | |
307 | */ | |
308 | static int | |
309 | sclp_vt220_add_msg(struct sclp_vt220_request *request, | |
310 | const unsigned char *msg, int count, int convertlf) | |
311 | { | |
312 | struct sclp_vt220_sccb *sccb; | |
313 | void *buffer; | |
314 | unsigned char c; | |
315 | int from; | |
316 | int to; | |
317 | ||
318 | if (count > sclp_vt220_space_left(request)) | |
319 | count = sclp_vt220_space_left(request); | |
320 | if (count <= 0) | |
321 | return 0; | |
322 | ||
323 | sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; | |
324 | buffer = (void *) ((addr_t) sccb + sccb->header.length); | |
325 | ||
326 | if (convertlf) { | |
327 | /* Perform Linefeed conversion (0x0a -> 0x0a 0x0d)*/ | |
328 | for (from=0, to=0; | |
329 | (from < count) && (to < sclp_vt220_space_left(request)); | |
330 | from++) { | |
331 | /* Retrieve character */ | |
332 | c = msg[from]; | |
333 | /* Perform conversion */ | |
334 | if (c == 0x0a) { | |
335 | if (to + 1 < sclp_vt220_space_left(request)) { | |
336 | ((unsigned char *) buffer)[to++] = c; | |
337 | ((unsigned char *) buffer)[to++] = 0x0d; | |
338 | } else | |
339 | break; | |
340 | ||
341 | } else | |
342 | ((unsigned char *) buffer)[to++] = c; | |
343 | } | |
344 | sccb->header.length += to; | |
345 | sccb->evbuf.length += to; | |
346 | return from; | |
347 | } else { | |
348 | memcpy(buffer, (const void *) msg, count); | |
349 | sccb->header.length += count; | |
350 | sccb->evbuf.length += count; | |
351 | return count; | |
352 | } | |
353 | } | |
354 | ||
355 | /* | |
356 | * Emit buffer after having waited long enough for more data to arrive. | |
357 | */ | |
358 | static void | |
359 | sclp_vt220_timeout(unsigned long data) | |
360 | { | |
361 | sclp_vt220_emit_current(); | |
362 | } | |
363 | ||
fa331ffc | 364 | #define BUFFER_MAX_DELAY HZ/20 |
1da177e4 | 365 | |
25b41a7b MS |
366 | /* |
367 | * Drop oldest console buffer if sclp_con_drop is set | |
368 | */ | |
369 | static int | |
370 | sclp_vt220_drop_buffer(void) | |
371 | { | |
372 | struct list_head *list; | |
373 | struct sclp_vt220_request *request; | |
374 | void *page; | |
375 | ||
376 | if (!sclp_console_drop) | |
377 | return 0; | |
378 | list = sclp_vt220_outqueue.next; | |
379 | if (sclp_vt220_queue_running) | |
380 | /* The first element is in I/O */ | |
381 | list = list->next; | |
382 | if (list == &sclp_vt220_outqueue) | |
383 | return 0; | |
384 | list_del(list); | |
385 | request = list_entry(list, struct sclp_vt220_request, list); | |
386 | page = request->sclp_req.sccb; | |
387 | list_add_tail((struct list_head *) page, &sclp_vt220_empty); | |
388 | return 1; | |
389 | } | |
390 | ||
1da177e4 LT |
391 | /* |
392 | * Internal implementation of the write function. Write COUNT bytes of data | |
393 | * from memory at BUF | |
394 | * to the SCLP interface. In case that the data does not fit into the current | |
395 | * write buffer, emit the current one and allocate a new one. If there are no | |
396 | * more empty buffers available, wait until one gets emptied. If DO_SCHEDULE | |
397 | * is non-zero, the buffer will be scheduled for emitting after a timeout - | |
398 | * otherwise the user has to explicitly call the flush function. | |
399 | * A non-zero CONVERTLF parameter indicates that 0x0a characters in the message | |
400 | * buffer should be converted to 0x0a 0x0d. After completion, return the number | |
401 | * of bytes written. | |
402 | */ | |
403 | static int | |
404 | __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule, | |
d4820e44 | 405 | int convertlf, int may_fail) |
1da177e4 LT |
406 | { |
407 | unsigned long flags; | |
408 | void *page; | |
409 | int written; | |
410 | int overall_written; | |
411 | ||
412 | if (count <= 0) | |
413 | return 0; | |
414 | overall_written = 0; | |
415 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
416 | do { | |
d4820e44 | 417 | /* Create an sclp output buffer if none exists yet */ |
1da177e4 | 418 | if (sclp_vt220_current_request == NULL) { |
25b41a7b MS |
419 | if (list_empty(&sclp_vt220_empty)) |
420 | sclp_console_full++; | |
1da177e4 | 421 | while (list_empty(&sclp_vt220_empty)) { |
62b74942 | 422 | if (may_fail || sclp_vt220_suspended) |
d4820e44 | 423 | goto out; |
25b41a7b MS |
424 | if (sclp_vt220_drop_buffer()) |
425 | break; | |
426 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
427 | ||
428 | sclp_sync_wait(); | |
1da177e4 LT |
429 | spin_lock_irqsave(&sclp_vt220_lock, flags); |
430 | } | |
431 | page = (void *) sclp_vt220_empty.next; | |
432 | list_del((struct list_head *) page); | |
433 | sclp_vt220_current_request = | |
434 | sclp_vt220_initialize_page(page); | |
435 | } | |
436 | /* Try to write the string to the current request buffer */ | |
437 | written = sclp_vt220_add_msg(sclp_vt220_current_request, | |
438 | buf, count, convertlf); | |
439 | overall_written += written; | |
440 | if (written == count) | |
441 | break; | |
442 | /* | |
443 | * Not all characters could be written to the current | |
444 | * output buffer. Emit the buffer, create a new buffer | |
445 | * and then output the rest of the string. | |
446 | */ | |
447 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
448 | sclp_vt220_emit_current(); | |
449 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
450 | buf += written; | |
451 | count -= written; | |
452 | } while (count > 0); | |
453 | /* Setup timer to output current console buffer after some time */ | |
454 | if (sclp_vt220_current_request != NULL && | |
455 | !timer_pending(&sclp_vt220_timer) && do_schedule) { | |
456 | sclp_vt220_timer.function = sclp_vt220_timeout; | |
457 | sclp_vt220_timer.data = 0UL; | |
458 | sclp_vt220_timer.expires = jiffies + BUFFER_MAX_DELAY; | |
459 | add_timer(&sclp_vt220_timer); | |
460 | } | |
d4820e44 | 461 | out: |
25b41a7b | 462 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
1da177e4 LT |
463 | return overall_written; |
464 | } | |
465 | ||
466 | /* | |
467 | * This routine is called by the kernel to write a series of | |
468 | * characters to the tty device. The characters may come from | |
469 | * user space or kernel space. This routine will return the | |
470 | * number of characters actually accepted for writing. | |
471 | */ | |
472 | static int | |
473 | sclp_vt220_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
474 | { | |
d1e23375 | 475 | return __sclp_vt220_write(buf, count, 1, 0, 1); |
1da177e4 LT |
476 | } |
477 | ||
478 | #define SCLP_VT220_SESSION_ENDED 0x01 | |
479 | #define SCLP_VT220_SESSION_STARTED 0x80 | |
480 | #define SCLP_VT220_SESSION_DATA 0x00 | |
481 | ||
1d3f9094 HB |
482 | #ifdef CONFIG_MAGIC_SYSRQ |
483 | ||
484 | static int sysrq_pressed; | |
485 | static struct sysrq_work sysrq; | |
486 | ||
487 | static void sclp_vt220_reset_session(void) | |
488 | { | |
489 | sysrq_pressed = 0; | |
490 | } | |
491 | ||
492 | static void sclp_vt220_handle_input(const char *buffer, unsigned int count) | |
493 | { | |
494 | int i; | |
495 | ||
496 | for (i = 0; i < count; i++) { | |
497 | /* Handle magic sys request */ | |
498 | if (buffer[i] == ('O' ^ 0100)) { /* CTRL-O */ | |
499 | /* | |
500 | * If pressed again, reset sysrq_pressed | |
501 | * and flip CTRL-O character | |
502 | */ | |
503 | sysrq_pressed = !sysrq_pressed; | |
504 | if (sysrq_pressed) | |
505 | continue; | |
506 | } else if (sysrq_pressed) { | |
507 | sysrq.key = buffer[i]; | |
508 | schedule_sysrq_work(&sysrq); | |
509 | sysrq_pressed = 0; | |
510 | continue; | |
511 | } | |
512 | tty_insert_flip_char(&sclp_vt220_port, buffer[i], 0); | |
513 | } | |
514 | } | |
515 | ||
516 | #else | |
517 | ||
518 | static void sclp_vt220_reset_session(void) | |
519 | { | |
520 | } | |
521 | ||
522 | static void sclp_vt220_handle_input(const char *buffer, unsigned int count) | |
523 | { | |
524 | tty_insert_flip_string(&sclp_vt220_port, buffer, count); | |
525 | } | |
526 | ||
527 | #endif | |
528 | ||
1da177e4 LT |
529 | /* |
530 | * Called by the SCLP to report incoming event buffers. | |
531 | */ | |
532 | static void | |
533 | sclp_vt220_receiver_fn(struct evbuf_header *evbuf) | |
534 | { | |
535 | char *buffer; | |
536 | unsigned int count; | |
537 | ||
1da177e4 LT |
538 | buffer = (char *) ((addr_t) evbuf + sizeof(struct evbuf_header)); |
539 | count = evbuf->length - sizeof(struct evbuf_header); | |
540 | ||
541 | switch (*buffer) { | |
542 | case SCLP_VT220_SESSION_ENDED: | |
543 | case SCLP_VT220_SESSION_STARTED: | |
1d3f9094 | 544 | sclp_vt220_reset_session(); |
1da177e4 LT |
545 | break; |
546 | case SCLP_VT220_SESSION_DATA: | |
547 | /* Send input to line discipline */ | |
548 | buffer++; | |
549 | count--; | |
1d3f9094 | 550 | sclp_vt220_handle_input(buffer, count); |
2e124b4a | 551 | tty_flip_buffer_push(&sclp_vt220_port); |
1da177e4 LT |
552 | break; |
553 | } | |
554 | } | |
555 | ||
556 | /* | |
557 | * This routine is called when a particular tty device is opened. | |
558 | */ | |
559 | static int | |
560 | sclp_vt220_open(struct tty_struct *tty, struct file *filp) | |
561 | { | |
562 | if (tty->count == 1) { | |
092f7377 | 563 | tty_port_tty_set(&sclp_vt220_port, tty); |
d6c53c0e | 564 | sclp_vt220_port.low_latency = 0; |
0b665d77 HB |
565 | if (!tty->winsize.ws_row && !tty->winsize.ws_col) { |
566 | tty->winsize.ws_row = 24; | |
567 | tty->winsize.ws_col = 80; | |
568 | } | |
1da177e4 LT |
569 | } |
570 | return 0; | |
571 | } | |
572 | ||
573 | /* | |
574 | * This routine is called when a particular tty device is closed. | |
575 | */ | |
576 | static void | |
577 | sclp_vt220_close(struct tty_struct *tty, struct file *filp) | |
578 | { | |
b538c4ea | 579 | if (tty->count == 1) |
092f7377 | 580 | tty_port_tty_set(&sclp_vt220_port, NULL); |
1da177e4 LT |
581 | } |
582 | ||
583 | /* | |
584 | * This routine is called by the kernel to write a single | |
585 | * character to the tty device. If the kernel uses this routine, | |
586 | * it must call the flush_chars() routine (if defined) when it is | |
587 | * done stuffing characters into the driver. | |
1da177e4 | 588 | */ |
9e7c9a19 | 589 | static int |
1da177e4 LT |
590 | sclp_vt220_put_char(struct tty_struct *tty, unsigned char ch) |
591 | { | |
d4820e44 | 592 | return __sclp_vt220_write(&ch, 1, 0, 0, 1); |
1da177e4 LT |
593 | } |
594 | ||
595 | /* | |
596 | * This routine is called by the kernel after it has written a | |
597 | * series of characters to the tty device using put_char(). | |
598 | */ | |
599 | static void | |
600 | sclp_vt220_flush_chars(struct tty_struct *tty) | |
601 | { | |
62b74942 | 602 | if (!sclp_vt220_queue_running) |
1da177e4 LT |
603 | sclp_vt220_emit_current(); |
604 | else | |
605 | sclp_vt220_flush_later = 1; | |
606 | } | |
607 | ||
608 | /* | |
609 | * This routine returns the numbers of characters the tty driver | |
610 | * will accept for queuing to be written. This number is subject | |
611 | * to change as output buffers get emptied, or if the output flow | |
612 | * control is acted. | |
613 | */ | |
614 | static int | |
615 | sclp_vt220_write_room(struct tty_struct *tty) | |
616 | { | |
617 | unsigned long flags; | |
618 | struct list_head *l; | |
619 | int count; | |
620 | ||
621 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
622 | count = 0; | |
623 | if (sclp_vt220_current_request != NULL) | |
624 | count = sclp_vt220_space_left(sclp_vt220_current_request); | |
625 | list_for_each(l, &sclp_vt220_empty) | |
626 | count += SCLP_VT220_MAX_CHARS_PER_BUFFER; | |
627 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
628 | return count; | |
629 | } | |
630 | ||
631 | /* | |
632 | * Return number of buffered chars. | |
633 | */ | |
634 | static int | |
635 | sclp_vt220_chars_in_buffer(struct tty_struct *tty) | |
636 | { | |
637 | unsigned long flags; | |
638 | struct list_head *l; | |
639 | struct sclp_vt220_request *r; | |
640 | int count; | |
641 | ||
642 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
643 | count = 0; | |
644 | if (sclp_vt220_current_request != NULL) | |
645 | count = sclp_vt220_chars_stored(sclp_vt220_current_request); | |
646 | list_for_each(l, &sclp_vt220_outqueue) { | |
647 | r = list_entry(l, struct sclp_vt220_request, list); | |
648 | count += sclp_vt220_chars_stored(r); | |
649 | } | |
650 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
651 | return count; | |
652 | } | |
653 | ||
1da177e4 LT |
654 | /* |
655 | * Pass on all buffers to the hardware. Return only when there are no more | |
656 | * buffers pending. | |
657 | */ | |
658 | static void | |
659 | sclp_vt220_flush_buffer(struct tty_struct *tty) | |
660 | { | |
661 | sclp_vt220_emit_current(); | |
662 | } | |
663 | ||
ad211790 PO |
664 | /* Release allocated pages. */ |
665 | static void __init __sclp_vt220_free_pages(void) | |
5aaaf9f0 HC |
666 | { |
667 | struct list_head *page, *p; | |
668 | ||
669 | list_for_each_safe(page, p, &sclp_vt220_empty) { | |
670 | list_del(page); | |
5c0792f6 | 671 | free_page((unsigned long) page); |
5aaaf9f0 HC |
672 | } |
673 | } | |
674 | ||
ad211790 PO |
675 | /* Release memory and unregister from sclp core. Controlled by init counting - |
676 | * only the last invoker will actually perform these actions. */ | |
677 | static void __init __sclp_vt220_cleanup(void) | |
678 | { | |
679 | sclp_vt220_init_count--; | |
680 | if (sclp_vt220_init_count != 0) | |
681 | return; | |
682 | sclp_unregister(&sclp_vt220_register); | |
683 | __sclp_vt220_free_pages(); | |
191c5f10 | 684 | tty_port_destroy(&sclp_vt220_port); |
ad211790 PO |
685 | } |
686 | ||
687 | /* Allocate buffer pages and register with sclp core. Controlled by init | |
688 | * counting - only the first invoker will actually perform these actions. */ | |
689 | static int __init __sclp_vt220_init(int num_pages) | |
1da177e4 LT |
690 | { |
691 | void *page; | |
692 | int i; | |
59eb1ca7 | 693 | int rc; |
1da177e4 | 694 | |
ad211790 PO |
695 | sclp_vt220_init_count++; |
696 | if (sclp_vt220_init_count != 1) | |
1da177e4 | 697 | return 0; |
1da177e4 LT |
698 | spin_lock_init(&sclp_vt220_lock); |
699 | INIT_LIST_HEAD(&sclp_vt220_empty); | |
700 | INIT_LIST_HEAD(&sclp_vt220_outqueue); | |
1da177e4 | 701 | init_timer(&sclp_vt220_timer); |
092f7377 | 702 | tty_port_init(&sclp_vt220_port); |
1da177e4 LT |
703 | sclp_vt220_current_request = NULL; |
704 | sclp_vt220_buffered_chars = 0; | |
1da177e4 LT |
705 | sclp_vt220_flush_later = 0; |
706 | ||
707 | /* Allocate pages for output buffering */ | |
5c0792f6 | 708 | rc = -ENOMEM; |
5aaaf9f0 | 709 | for (i = 0; i < num_pages; i++) { |
5c0792f6 HC |
710 | page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
711 | if (!page) | |
ad211790 | 712 | goto out; |
5c0792f6 | 713 | list_add_tail(page, &sclp_vt220_empty); |
1da177e4 | 714 | } |
59eb1ca7 | 715 | rc = sclp_register(&sclp_vt220_register); |
ad211790 | 716 | out: |
59eb1ca7 | 717 | if (rc) { |
ad211790 PO |
718 | __sclp_vt220_free_pages(); |
719 | sclp_vt220_init_count--; | |
191c5f10 | 720 | tty_port_destroy(&sclp_vt220_port); |
59eb1ca7 CB |
721 | } |
722 | return rc; | |
1da177e4 LT |
723 | } |
724 | ||
b68e31d0 | 725 | static const struct tty_operations sclp_vt220_ops = { |
1da177e4 LT |
726 | .open = sclp_vt220_open, |
727 | .close = sclp_vt220_close, | |
728 | .write = sclp_vt220_write, | |
729 | .put_char = sclp_vt220_put_char, | |
730 | .flush_chars = sclp_vt220_flush_chars, | |
731 | .write_room = sclp_vt220_write_room, | |
732 | .chars_in_buffer = sclp_vt220_chars_in_buffer, | |
5aaaf9f0 | 733 | .flush_buffer = sclp_vt220_flush_buffer, |
1da177e4 LT |
734 | }; |
735 | ||
736 | /* | |
737 | * Register driver with SCLP and Linux and initialize internal tty structures. | |
738 | */ | |
5aaaf9f0 | 739 | static int __init sclp_vt220_tty_init(void) |
1da177e4 LT |
740 | { |
741 | struct tty_driver *driver; | |
742 | int rc; | |
743 | ||
744 | /* Note: we're not testing for CONSOLE_IS_SCLP here to preserve | |
745 | * symmetry between VM and LPAR systems regarding ttyS1. */ | |
746 | driver = alloc_tty_driver(1); | |
747 | if (!driver) | |
748 | return -ENOMEM; | |
ad211790 | 749 | rc = __sclp_vt220_init(MAX_KMEM_PAGES); |
5aaaf9f0 HC |
750 | if (rc) |
751 | goto out_driver; | |
1da177e4 | 752 | |
1da177e4 LT |
753 | driver->driver_name = SCLP_VT220_DRIVER_NAME; |
754 | driver->name = SCLP_VT220_DEVICE_NAME; | |
755 | driver->major = SCLP_VT220_MAJOR; | |
756 | driver->minor_start = SCLP_VT220_MINOR; | |
757 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
758 | driver->subtype = SYSTEM_TYPE_TTY; | |
759 | driver->init_termios = tty_std_termios; | |
760 | driver->flags = TTY_DRIVER_REAL_RAW; | |
761 | tty_set_operations(driver, &sclp_vt220_ops); | |
b19e2ca7 | 762 | tty_port_link_device(&sclp_vt220_port, driver, 0); |
1da177e4 LT |
763 | |
764 | rc = tty_register_driver(driver); | |
a12c53f4 | 765 | if (rc) |
59eb1ca7 | 766 | goto out_init; |
e106e4ea PO |
767 | rc = sclp_register(&sclp_vt220_register_input); |
768 | if (rc) | |
769 | goto out_reg; | |
1da177e4 LT |
770 | sclp_vt220_driver = driver; |
771 | return 0; | |
1da177e4 | 772 | |
e106e4ea PO |
773 | out_reg: |
774 | tty_unregister_driver(driver); | |
5aaaf9f0 | 775 | out_init: |
ad211790 | 776 | __sclp_vt220_cleanup(); |
5aaaf9f0 HC |
777 | out_driver: |
778 | put_tty_driver(driver); | |
779 | return rc; | |
780 | } | |
781 | __initcall(sclp_vt220_tty_init); | |
1da177e4 | 782 | |
b3b59d33 HC |
783 | static void __sclp_vt220_flush_buffer(void) |
784 | { | |
785 | unsigned long flags; | |
786 | ||
787 | sclp_vt220_emit_current(); | |
788 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
789 | if (timer_pending(&sclp_vt220_timer)) | |
790 | del_timer(&sclp_vt220_timer); | |
62b74942 | 791 | while (sclp_vt220_queue_running) { |
b3b59d33 HC |
792 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
793 | sclp_sync_wait(); | |
794 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
795 | } | |
796 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
797 | } | |
798 | ||
62b74942 MH |
799 | /* |
800 | * Resume console: If there are cached messages, emit them. | |
801 | */ | |
802 | static void sclp_vt220_resume(void) | |
803 | { | |
804 | unsigned long flags; | |
805 | ||
806 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
807 | sclp_vt220_suspended = 0; | |
808 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
809 | sclp_vt220_emit_current(); | |
810 | } | |
811 | ||
812 | /* | |
813 | * Suspend console: Set suspend flag and flush console | |
814 | */ | |
815 | static void sclp_vt220_suspend(void) | |
816 | { | |
817 | unsigned long flags; | |
818 | ||
819 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
820 | sclp_vt220_suspended = 1; | |
821 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
822 | __sclp_vt220_flush_buffer(); | |
823 | } | |
824 | ||
825 | static void sclp_vt220_pm_event_fn(struct sclp_register *reg, | |
826 | enum sclp_pm_event sclp_pm_event) | |
827 | { | |
828 | switch (sclp_pm_event) { | |
829 | case SCLP_PM_EVENT_FREEZE: | |
830 | sclp_vt220_suspend(); | |
831 | break; | |
832 | case SCLP_PM_EVENT_RESTORE: | |
833 | case SCLP_PM_EVENT_THAW: | |
834 | sclp_vt220_resume(); | |
835 | break; | |
836 | } | |
837 | } | |
838 | ||
ac522b63 MH |
839 | #ifdef CONFIG_SCLP_VT220_CONSOLE |
840 | ||
841 | static void | |
842 | sclp_vt220_con_write(struct console *con, const char *buf, unsigned int count) | |
843 | { | |
844 | __sclp_vt220_write((const unsigned char *) buf, count, 1, 1, 0); | |
845 | } | |
846 | ||
847 | static struct tty_driver * | |
848 | sclp_vt220_con_device(struct console *c, int *index) | |
849 | { | |
850 | *index = 0; | |
851 | return sclp_vt220_driver; | |
852 | } | |
853 | ||
2332ce1a HS |
854 | static int |
855 | sclp_vt220_notify(struct notifier_block *self, | |
856 | unsigned long event, void *data) | |
1da177e4 LT |
857 | { |
858 | __sclp_vt220_flush_buffer(); | |
2332ce1a | 859 | return NOTIFY_OK; |
1da177e4 LT |
860 | } |
861 | ||
2332ce1a HS |
862 | static struct notifier_block on_panic_nb = { |
863 | .notifier_call = sclp_vt220_notify, | |
864 | .priority = 1, | |
865 | }; | |
866 | ||
867 | static struct notifier_block on_reboot_nb = { | |
868 | .notifier_call = sclp_vt220_notify, | |
869 | .priority = 1, | |
870 | }; | |
871 | ||
1da177e4 LT |
872 | /* Structure needed to register with printk */ |
873 | static struct console sclp_vt220_console = | |
874 | { | |
875 | .name = SCLP_VT220_CONSOLE_NAME, | |
876 | .write = sclp_vt220_con_write, | |
877 | .device = sclp_vt220_con_device, | |
1da177e4 LT |
878 | .flags = CON_PRINTBUFFER, |
879 | .index = SCLP_VT220_CONSOLE_INDEX | |
880 | }; | |
881 | ||
882 | static int __init | |
883 | sclp_vt220_con_init(void) | |
884 | { | |
885 | int rc; | |
886 | ||
25b41a7b | 887 | rc = __sclp_vt220_init(sclp_console_pages); |
1da177e4 LT |
888 | if (rc) |
889 | return rc; | |
890 | /* Attach linux console */ | |
2332ce1a HS |
891 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
892 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
893 | register_console(&sclp_vt220_console); |
894 | return 0; | |
895 | } | |
896 | ||
897 | console_initcall(sclp_vt220_con_init); | |
898 | #endif /* CONFIG_SCLP_VT220_CONSOLE */ | |
899 |