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> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/tty_driver.h> | |
33f0f88f | 17 | #include <linux/tty_flip.h> |
1da177e4 LT |
18 | #include <linux/errno.h> |
19 | #include <linux/mm.h> | |
20 | #include <linux/major.h> | |
21 | #include <linux/console.h> | |
22 | #include <linux/kdev_t.h> | |
1da177e4 LT |
23 | #include <linux/interrupt.h> |
24 | #include <linux/init.h> | |
2332ce1a | 25 | #include <linux/reboot.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
2332ce1a | 27 | |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include "sclp.h" | |
30 | ||
1da177e4 LT |
31 | #define SCLP_VT220_MAJOR TTY_MAJOR |
32 | #define SCLP_VT220_MINOR 65 | |
33 | #define SCLP_VT220_DRIVER_NAME "sclp_vt220" | |
34 | #define SCLP_VT220_DEVICE_NAME "ttysclp" | |
35 | #define SCLP_VT220_CONSOLE_NAME "ttyS" | |
36 | #define SCLP_VT220_CONSOLE_INDEX 1 /* console=ttyS1 */ | |
1da177e4 LT |
37 | |
38 | /* Representation of a single write request */ | |
39 | struct sclp_vt220_request { | |
40 | struct list_head list; | |
41 | struct sclp_req sclp_req; | |
42 | int retry_count; | |
43 | }; | |
44 | ||
45 | /* VT220 SCCB */ | |
46 | struct sclp_vt220_sccb { | |
47 | struct sccb_header header; | |
48 | struct evbuf_header evbuf; | |
49 | }; | |
50 | ||
51 | #define SCLP_VT220_MAX_CHARS_PER_BUFFER (PAGE_SIZE - \ | |
52 | sizeof(struct sclp_vt220_request) - \ | |
53 | sizeof(struct sclp_vt220_sccb)) | |
54 | ||
55 | /* Structures and data needed to register tty driver */ | |
56 | static struct tty_driver *sclp_vt220_driver; | |
57 | ||
092f7377 | 58 | static struct tty_port sclp_vt220_port; |
1da177e4 LT |
59 | |
60 | /* Lock to protect internal data from concurrent access */ | |
61 | static spinlock_t sclp_vt220_lock; | |
62 | ||
63 | /* List of empty pages to be used as write request buffers */ | |
64 | static struct list_head sclp_vt220_empty; | |
65 | ||
66 | /* List of pending requests */ | |
67 | static struct list_head sclp_vt220_outqueue; | |
68 | ||
62b74942 MH |
69 | /* Suspend mode flag */ |
70 | static int sclp_vt220_suspended; | |
71 | ||
72 | /* Flag that output queue is currently running */ | |
73 | static int sclp_vt220_queue_running; | |
1da177e4 | 74 | |
1da177e4 LT |
75 | /* Timer used for delaying write requests to merge subsequent messages into |
76 | * a single buffer */ | |
77 | static struct timer_list sclp_vt220_timer; | |
78 | ||
79 | /* Pointer to current request buffer which has been partially filled but not | |
80 | * yet sent */ | |
81 | static struct sclp_vt220_request *sclp_vt220_current_request; | |
82 | ||
83 | /* Number of characters in current request buffer */ | |
84 | static int sclp_vt220_buffered_chars; | |
85 | ||
ad211790 PO |
86 | /* Counter controlling core driver initialization. */ |
87 | static int __initdata sclp_vt220_init_count; | |
1da177e4 LT |
88 | |
89 | /* Flag indicating that sclp_vt220_current_request should really | |
90 | * have been already queued but wasn't because the SCLP was processing | |
91 | * another buffer */ | |
92 | static int sclp_vt220_flush_later; | |
93 | ||
94 | static void sclp_vt220_receiver_fn(struct evbuf_header *evbuf); | |
62b74942 MH |
95 | static void sclp_vt220_pm_event_fn(struct sclp_register *reg, |
96 | enum sclp_pm_event sclp_pm_event); | |
1da177e4 LT |
97 | static int __sclp_vt220_emit(struct sclp_vt220_request *request); |
98 | static void sclp_vt220_emit_current(void); | |
99 | ||
e106e4ea | 100 | /* Registration structure for SCLP output event buffers */ |
1da177e4 | 101 | static struct sclp_register sclp_vt220_register = { |
6d4740c8 | 102 | .send_mask = EVTYP_VT220MSG_MASK, |
e106e4ea PO |
103 | .pm_event_fn = sclp_vt220_pm_event_fn, |
104 | }; | |
105 | ||
106 | /* Registration structure for SCLP input event buffers */ | |
107 | static struct sclp_register sclp_vt220_register_input = { | |
6d4740c8 | 108 | .receive_mask = EVTYP_VT220MSG_MASK, |
62b74942 | 109 | .receiver_fn = sclp_vt220_receiver_fn, |
1da177e4 LT |
110 | }; |
111 | ||
112 | ||
113 | /* | |
114 | * Put provided request buffer back into queue and check emit pending | |
115 | * buffers if necessary. | |
116 | */ | |
117 | static void | |
118 | sclp_vt220_process_queue(struct sclp_vt220_request *request) | |
119 | { | |
120 | unsigned long flags; | |
121 | void *page; | |
122 | ||
123 | do { | |
124 | /* Put buffer back to list of empty buffers */ | |
125 | page = request->sclp_req.sccb; | |
126 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
127 | /* Move request from outqueue to empty queue */ | |
128 | list_del(&request->list); | |
1da177e4 LT |
129 | list_add_tail((struct list_head *) page, &sclp_vt220_empty); |
130 | /* Check if there is a pending buffer on the out queue. */ | |
131 | request = NULL; | |
132 | if (!list_empty(&sclp_vt220_outqueue)) | |
133 | request = list_entry(sclp_vt220_outqueue.next, | |
134 | struct sclp_vt220_request, list); | |
62b74942 MH |
135 | if (!request || sclp_vt220_suspended) { |
136 | sclp_vt220_queue_running = 0; | |
137 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
138 | break; | |
139 | } | |
1da177e4 | 140 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
62b74942 | 141 | } while (__sclp_vt220_emit(request)); |
1da177e4 LT |
142 | if (request == NULL && sclp_vt220_flush_later) |
143 | sclp_vt220_emit_current(); | |
6aad04f2 | 144 | tty_port_tty_wakeup(&sclp_vt220_port); |
1da177e4 LT |
145 | } |
146 | ||
147 | #define SCLP_BUFFER_MAX_RETRY 1 | |
148 | ||
149 | /* | |
150 | * Callback through which the result of a write request is reported by the | |
151 | * SCLP. | |
152 | */ | |
153 | static void | |
154 | sclp_vt220_callback(struct sclp_req *request, void *data) | |
155 | { | |
156 | struct sclp_vt220_request *vt220_request; | |
157 | struct sclp_vt220_sccb *sccb; | |
158 | ||
159 | vt220_request = (struct sclp_vt220_request *) data; | |
160 | if (request->status == SCLP_REQ_FAILED) { | |
161 | sclp_vt220_process_queue(vt220_request); | |
162 | return; | |
163 | } | |
164 | sccb = (struct sclp_vt220_sccb *) vt220_request->sclp_req.sccb; | |
165 | ||
166 | /* Check SCLP response code and choose suitable action */ | |
167 | switch (sccb->header.response_code) { | |
168 | case 0x0020 : | |
169 | break; | |
170 | ||
171 | case 0x05f0: /* Target resource in improper state */ | |
172 | break; | |
173 | ||
174 | case 0x0340: /* Contained SCLP equipment check */ | |
175 | if (++vt220_request->retry_count > SCLP_BUFFER_MAX_RETRY) | |
176 | break; | |
177 | /* Remove processed buffers and requeue rest */ | |
178 | if (sclp_remove_processed((struct sccb_header *) sccb) > 0) { | |
179 | /* Not all buffers were processed */ | |
180 | sccb->header.response_code = 0x0000; | |
181 | vt220_request->sclp_req.status = SCLP_REQ_FILLED; | |
182 | if (sclp_add_request(request) == 0) | |
183 | return; | |
184 | } | |
185 | break; | |
186 | ||
187 | case 0x0040: /* SCLP equipment check */ | |
188 | if (++vt220_request->retry_count > SCLP_BUFFER_MAX_RETRY) | |
189 | break; | |
190 | sccb->header.response_code = 0x0000; | |
191 | vt220_request->sclp_req.status = SCLP_REQ_FILLED; | |
192 | if (sclp_add_request(request) == 0) | |
193 | return; | |
194 | break; | |
195 | ||
196 | default: | |
197 | break; | |
198 | } | |
199 | sclp_vt220_process_queue(vt220_request); | |
200 | } | |
201 | ||
202 | /* | |
203 | * Emit vt220 request buffer to SCLP. Return zero on success, non-zero | |
204 | * otherwise. | |
205 | */ | |
206 | static int | |
207 | __sclp_vt220_emit(struct sclp_vt220_request *request) | |
208 | { | |
d082d3ce | 209 | if (!(sclp_vt220_register.sclp_receive_mask & EVTYP_VT220MSG_MASK)) { |
1da177e4 LT |
210 | request->sclp_req.status = SCLP_REQ_FAILED; |
211 | return -EIO; | |
212 | } | |
ab14de6c | 213 | request->sclp_req.command = SCLP_CMDW_WRITE_EVENT_DATA; |
1da177e4 LT |
214 | request->sclp_req.status = SCLP_REQ_FILLED; |
215 | request->sclp_req.callback = sclp_vt220_callback; | |
216 | request->sclp_req.callback_data = (void *) request; | |
217 | ||
218 | return sclp_add_request(&request->sclp_req); | |
219 | } | |
220 | ||
221 | /* | |
62b74942 | 222 | * Queue and emit current request. |
1da177e4 LT |
223 | */ |
224 | static void | |
225 | sclp_vt220_emit_current(void) | |
226 | { | |
227 | unsigned long flags; | |
228 | struct sclp_vt220_request *request; | |
229 | struct sclp_vt220_sccb *sccb; | |
230 | ||
231 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
62b74942 | 232 | if (sclp_vt220_current_request) { |
1da177e4 LT |
233 | sccb = (struct sclp_vt220_sccb *) |
234 | sclp_vt220_current_request->sclp_req.sccb; | |
235 | /* Only emit buffers with content */ | |
236 | if (sccb->header.length != sizeof(struct sclp_vt220_sccb)) { | |
62b74942 MH |
237 | list_add_tail(&sclp_vt220_current_request->list, |
238 | &sclp_vt220_outqueue); | |
1da177e4 LT |
239 | sclp_vt220_current_request = NULL; |
240 | if (timer_pending(&sclp_vt220_timer)) | |
241 | del_timer(&sclp_vt220_timer); | |
242 | } | |
243 | sclp_vt220_flush_later = 0; | |
244 | } | |
62b74942 MH |
245 | if (sclp_vt220_queue_running || sclp_vt220_suspended) |
246 | goto out_unlock; | |
247 | if (list_empty(&sclp_vt220_outqueue)) | |
248 | goto out_unlock; | |
249 | request = list_first_entry(&sclp_vt220_outqueue, | |
250 | struct sclp_vt220_request, list); | |
251 | sclp_vt220_queue_running = 1; | |
252 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
253 | ||
254 | if (__sclp_vt220_emit(request)) | |
255 | sclp_vt220_process_queue(request); | |
256 | return; | |
257 | out_unlock: | |
1da177e4 | 258 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
1da177e4 LT |
259 | } |
260 | ||
261 | #define SCLP_NORMAL_WRITE 0x00 | |
262 | ||
263 | /* | |
264 | * Helper function to initialize a page with the sclp request structure. | |
265 | */ | |
266 | static struct sclp_vt220_request * | |
267 | sclp_vt220_initialize_page(void *page) | |
268 | { | |
269 | struct sclp_vt220_request *request; | |
270 | struct sclp_vt220_sccb *sccb; | |
271 | ||
272 | /* Place request structure at end of page */ | |
273 | request = ((struct sclp_vt220_request *) | |
274 | ((addr_t) page + PAGE_SIZE)) - 1; | |
275 | request->retry_count = 0; | |
276 | request->sclp_req.sccb = page; | |
277 | /* SCCB goes at start of page */ | |
278 | sccb = (struct sclp_vt220_sccb *) page; | |
279 | memset((void *) sccb, 0, sizeof(struct sclp_vt220_sccb)); | |
280 | sccb->header.length = sizeof(struct sclp_vt220_sccb); | |
281 | sccb->header.function_code = SCLP_NORMAL_WRITE; | |
282 | sccb->header.response_code = 0x0000; | |
6d4740c8 | 283 | sccb->evbuf.type = EVTYP_VT220MSG; |
1da177e4 LT |
284 | sccb->evbuf.length = sizeof(struct evbuf_header); |
285 | ||
286 | return request; | |
287 | } | |
288 | ||
289 | static inline unsigned int | |
290 | sclp_vt220_space_left(struct sclp_vt220_request *request) | |
291 | { | |
292 | struct sclp_vt220_sccb *sccb; | |
293 | sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; | |
294 | return PAGE_SIZE - sizeof(struct sclp_vt220_request) - | |
295 | sccb->header.length; | |
296 | } | |
297 | ||
298 | static inline unsigned int | |
299 | sclp_vt220_chars_stored(struct sclp_vt220_request *request) | |
300 | { | |
301 | struct sclp_vt220_sccb *sccb; | |
302 | sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; | |
303 | return sccb->evbuf.length - sizeof(struct evbuf_header); | |
304 | } | |
305 | ||
306 | /* | |
307 | * Add msg to buffer associated with request. Return the number of characters | |
308 | * added. | |
309 | */ | |
310 | static int | |
311 | sclp_vt220_add_msg(struct sclp_vt220_request *request, | |
312 | const unsigned char *msg, int count, int convertlf) | |
313 | { | |
314 | struct sclp_vt220_sccb *sccb; | |
315 | void *buffer; | |
316 | unsigned char c; | |
317 | int from; | |
318 | int to; | |
319 | ||
320 | if (count > sclp_vt220_space_left(request)) | |
321 | count = sclp_vt220_space_left(request); | |
322 | if (count <= 0) | |
323 | return 0; | |
324 | ||
325 | sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; | |
326 | buffer = (void *) ((addr_t) sccb + sccb->header.length); | |
327 | ||
328 | if (convertlf) { | |
329 | /* Perform Linefeed conversion (0x0a -> 0x0a 0x0d)*/ | |
330 | for (from=0, to=0; | |
331 | (from < count) && (to < sclp_vt220_space_left(request)); | |
332 | from++) { | |
333 | /* Retrieve character */ | |
334 | c = msg[from]; | |
335 | /* Perform conversion */ | |
336 | if (c == 0x0a) { | |
337 | if (to + 1 < sclp_vt220_space_left(request)) { | |
338 | ((unsigned char *) buffer)[to++] = c; | |
339 | ((unsigned char *) buffer)[to++] = 0x0d; | |
340 | } else | |
341 | break; | |
342 | ||
343 | } else | |
344 | ((unsigned char *) buffer)[to++] = c; | |
345 | } | |
346 | sccb->header.length += to; | |
347 | sccb->evbuf.length += to; | |
348 | return from; | |
349 | } else { | |
350 | memcpy(buffer, (const void *) msg, count); | |
351 | sccb->header.length += count; | |
352 | sccb->evbuf.length += count; | |
353 | return count; | |
354 | } | |
355 | } | |
356 | ||
357 | /* | |
358 | * Emit buffer after having waited long enough for more data to arrive. | |
359 | */ | |
360 | static void | |
361 | sclp_vt220_timeout(unsigned long data) | |
362 | { | |
363 | sclp_vt220_emit_current(); | |
364 | } | |
365 | ||
fa331ffc | 366 | #define BUFFER_MAX_DELAY HZ/20 |
1da177e4 | 367 | |
25b41a7b MS |
368 | /* |
369 | * Drop oldest console buffer if sclp_con_drop is set | |
370 | */ | |
371 | static int | |
372 | sclp_vt220_drop_buffer(void) | |
373 | { | |
374 | struct list_head *list; | |
375 | struct sclp_vt220_request *request; | |
376 | void *page; | |
377 | ||
378 | if (!sclp_console_drop) | |
379 | return 0; | |
380 | list = sclp_vt220_outqueue.next; | |
381 | if (sclp_vt220_queue_running) | |
382 | /* The first element is in I/O */ | |
383 | list = list->next; | |
384 | if (list == &sclp_vt220_outqueue) | |
385 | return 0; | |
386 | list_del(list); | |
387 | request = list_entry(list, struct sclp_vt220_request, list); | |
388 | page = request->sclp_req.sccb; | |
389 | list_add_tail((struct list_head *) page, &sclp_vt220_empty); | |
390 | return 1; | |
391 | } | |
392 | ||
1da177e4 LT |
393 | /* |
394 | * Internal implementation of the write function. Write COUNT bytes of data | |
395 | * from memory at BUF | |
396 | * to the SCLP interface. In case that the data does not fit into the current | |
397 | * write buffer, emit the current one and allocate a new one. If there are no | |
398 | * more empty buffers available, wait until one gets emptied. If DO_SCHEDULE | |
399 | * is non-zero, the buffer will be scheduled for emitting after a timeout - | |
400 | * otherwise the user has to explicitly call the flush function. | |
401 | * A non-zero CONVERTLF parameter indicates that 0x0a characters in the message | |
402 | * buffer should be converted to 0x0a 0x0d. After completion, return the number | |
403 | * of bytes written. | |
404 | */ | |
405 | static int | |
406 | __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule, | |
d4820e44 | 407 | int convertlf, int may_fail) |
1da177e4 LT |
408 | { |
409 | unsigned long flags; | |
410 | void *page; | |
411 | int written; | |
412 | int overall_written; | |
413 | ||
414 | if (count <= 0) | |
415 | return 0; | |
416 | overall_written = 0; | |
417 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
418 | do { | |
d4820e44 | 419 | /* Create an sclp output buffer if none exists yet */ |
1da177e4 | 420 | if (sclp_vt220_current_request == NULL) { |
25b41a7b MS |
421 | if (list_empty(&sclp_vt220_empty)) |
422 | sclp_console_full++; | |
1da177e4 | 423 | while (list_empty(&sclp_vt220_empty)) { |
62b74942 | 424 | if (may_fail || sclp_vt220_suspended) |
d4820e44 | 425 | goto out; |
25b41a7b MS |
426 | if (sclp_vt220_drop_buffer()) |
427 | break; | |
428 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
429 | ||
430 | sclp_sync_wait(); | |
1da177e4 LT |
431 | spin_lock_irqsave(&sclp_vt220_lock, flags); |
432 | } | |
433 | page = (void *) sclp_vt220_empty.next; | |
434 | list_del((struct list_head *) page); | |
435 | sclp_vt220_current_request = | |
436 | sclp_vt220_initialize_page(page); | |
437 | } | |
438 | /* Try to write the string to the current request buffer */ | |
439 | written = sclp_vt220_add_msg(sclp_vt220_current_request, | |
440 | buf, count, convertlf); | |
441 | overall_written += written; | |
442 | if (written == count) | |
443 | break; | |
444 | /* | |
445 | * Not all characters could be written to the current | |
446 | * output buffer. Emit the buffer, create a new buffer | |
447 | * and then output the rest of the string. | |
448 | */ | |
449 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
450 | sclp_vt220_emit_current(); | |
451 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
452 | buf += written; | |
453 | count -= written; | |
454 | } while (count > 0); | |
455 | /* Setup timer to output current console buffer after some time */ | |
456 | if (sclp_vt220_current_request != NULL && | |
457 | !timer_pending(&sclp_vt220_timer) && do_schedule) { | |
458 | sclp_vt220_timer.function = sclp_vt220_timeout; | |
459 | sclp_vt220_timer.data = 0UL; | |
460 | sclp_vt220_timer.expires = jiffies + BUFFER_MAX_DELAY; | |
461 | add_timer(&sclp_vt220_timer); | |
462 | } | |
d4820e44 | 463 | out: |
25b41a7b | 464 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
1da177e4 LT |
465 | return overall_written; |
466 | } | |
467 | ||
468 | /* | |
469 | * This routine is called by the kernel to write a series of | |
470 | * characters to the tty device. The characters may come from | |
471 | * user space or kernel space. This routine will return the | |
472 | * number of characters actually accepted for writing. | |
473 | */ | |
474 | static int | |
475 | sclp_vt220_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
476 | { | |
d1e23375 | 477 | return __sclp_vt220_write(buf, count, 1, 0, 1); |
1da177e4 LT |
478 | } |
479 | ||
480 | #define SCLP_VT220_SESSION_ENDED 0x01 | |
481 | #define SCLP_VT220_SESSION_STARTED 0x80 | |
482 | #define SCLP_VT220_SESSION_DATA 0x00 | |
483 | ||
484 | /* | |
485 | * Called by the SCLP to report incoming event buffers. | |
486 | */ | |
487 | static void | |
488 | sclp_vt220_receiver_fn(struct evbuf_header *evbuf) | |
489 | { | |
490 | char *buffer; | |
491 | unsigned int count; | |
492 | ||
1da177e4 LT |
493 | buffer = (char *) ((addr_t) evbuf + sizeof(struct evbuf_header)); |
494 | count = evbuf->length - sizeof(struct evbuf_header); | |
495 | ||
496 | switch (*buffer) { | |
497 | case SCLP_VT220_SESSION_ENDED: | |
498 | case SCLP_VT220_SESSION_STARTED: | |
499 | break; | |
500 | case SCLP_VT220_SESSION_DATA: | |
501 | /* Send input to line discipline */ | |
502 | buffer++; | |
503 | count--; | |
05c7cd39 | 504 | tty_insert_flip_string(&sclp_vt220_port, buffer, count); |
2e124b4a | 505 | tty_flip_buffer_push(&sclp_vt220_port); |
1da177e4 LT |
506 | break; |
507 | } | |
508 | } | |
509 | ||
510 | /* | |
511 | * This routine is called when a particular tty device is opened. | |
512 | */ | |
513 | static int | |
514 | sclp_vt220_open(struct tty_struct *tty, struct file *filp) | |
515 | { | |
516 | if (tty->count == 1) { | |
092f7377 | 517 | tty_port_tty_set(&sclp_vt220_port, tty); |
d6c53c0e | 518 | sclp_vt220_port.low_latency = 0; |
0b665d77 HB |
519 | if (!tty->winsize.ws_row && !tty->winsize.ws_col) { |
520 | tty->winsize.ws_row = 24; | |
521 | tty->winsize.ws_col = 80; | |
522 | } | |
1da177e4 LT |
523 | } |
524 | return 0; | |
525 | } | |
526 | ||
527 | /* | |
528 | * This routine is called when a particular tty device is closed. | |
529 | */ | |
530 | static void | |
531 | sclp_vt220_close(struct tty_struct *tty, struct file *filp) | |
532 | { | |
b538c4ea | 533 | if (tty->count == 1) |
092f7377 | 534 | tty_port_tty_set(&sclp_vt220_port, NULL); |
1da177e4 LT |
535 | } |
536 | ||
537 | /* | |
538 | * This routine is called by the kernel to write a single | |
539 | * character to the tty device. If the kernel uses this routine, | |
540 | * it must call the flush_chars() routine (if defined) when it is | |
541 | * done stuffing characters into the driver. | |
1da177e4 | 542 | */ |
9e7c9a19 | 543 | static int |
1da177e4 LT |
544 | sclp_vt220_put_char(struct tty_struct *tty, unsigned char ch) |
545 | { | |
d4820e44 | 546 | return __sclp_vt220_write(&ch, 1, 0, 0, 1); |
1da177e4 LT |
547 | } |
548 | ||
549 | /* | |
550 | * This routine is called by the kernel after it has written a | |
551 | * series of characters to the tty device using put_char(). | |
552 | */ | |
553 | static void | |
554 | sclp_vt220_flush_chars(struct tty_struct *tty) | |
555 | { | |
62b74942 | 556 | if (!sclp_vt220_queue_running) |
1da177e4 LT |
557 | sclp_vt220_emit_current(); |
558 | else | |
559 | sclp_vt220_flush_later = 1; | |
560 | } | |
561 | ||
562 | /* | |
563 | * This routine returns the numbers of characters the tty driver | |
564 | * will accept for queuing to be written. This number is subject | |
565 | * to change as output buffers get emptied, or if the output flow | |
566 | * control is acted. | |
567 | */ | |
568 | static int | |
569 | sclp_vt220_write_room(struct tty_struct *tty) | |
570 | { | |
571 | unsigned long flags; | |
572 | struct list_head *l; | |
573 | int count; | |
574 | ||
575 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
576 | count = 0; | |
577 | if (sclp_vt220_current_request != NULL) | |
578 | count = sclp_vt220_space_left(sclp_vt220_current_request); | |
579 | list_for_each(l, &sclp_vt220_empty) | |
580 | count += SCLP_VT220_MAX_CHARS_PER_BUFFER; | |
581 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
582 | return count; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Return number of buffered chars. | |
587 | */ | |
588 | static int | |
589 | sclp_vt220_chars_in_buffer(struct tty_struct *tty) | |
590 | { | |
591 | unsigned long flags; | |
592 | struct list_head *l; | |
593 | struct sclp_vt220_request *r; | |
594 | int count; | |
595 | ||
596 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
597 | count = 0; | |
598 | if (sclp_vt220_current_request != NULL) | |
599 | count = sclp_vt220_chars_stored(sclp_vt220_current_request); | |
600 | list_for_each(l, &sclp_vt220_outqueue) { | |
601 | r = list_entry(l, struct sclp_vt220_request, list); | |
602 | count += sclp_vt220_chars_stored(r); | |
603 | } | |
604 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
605 | return count; | |
606 | } | |
607 | ||
1da177e4 LT |
608 | /* |
609 | * Pass on all buffers to the hardware. Return only when there are no more | |
610 | * buffers pending. | |
611 | */ | |
612 | static void | |
613 | sclp_vt220_flush_buffer(struct tty_struct *tty) | |
614 | { | |
615 | sclp_vt220_emit_current(); | |
616 | } | |
617 | ||
ad211790 PO |
618 | /* Release allocated pages. */ |
619 | static void __init __sclp_vt220_free_pages(void) | |
5aaaf9f0 HC |
620 | { |
621 | struct list_head *page, *p; | |
622 | ||
623 | list_for_each_safe(page, p, &sclp_vt220_empty) { | |
624 | list_del(page); | |
5c0792f6 | 625 | free_page((unsigned long) page); |
5aaaf9f0 HC |
626 | } |
627 | } | |
628 | ||
ad211790 PO |
629 | /* Release memory and unregister from sclp core. Controlled by init counting - |
630 | * only the last invoker will actually perform these actions. */ | |
631 | static void __init __sclp_vt220_cleanup(void) | |
632 | { | |
633 | sclp_vt220_init_count--; | |
634 | if (sclp_vt220_init_count != 0) | |
635 | return; | |
636 | sclp_unregister(&sclp_vt220_register); | |
637 | __sclp_vt220_free_pages(); | |
191c5f10 | 638 | tty_port_destroy(&sclp_vt220_port); |
ad211790 PO |
639 | } |
640 | ||
641 | /* Allocate buffer pages and register with sclp core. Controlled by init | |
642 | * counting - only the first invoker will actually perform these actions. */ | |
643 | static int __init __sclp_vt220_init(int num_pages) | |
1da177e4 LT |
644 | { |
645 | void *page; | |
646 | int i; | |
59eb1ca7 | 647 | int rc; |
1da177e4 | 648 | |
ad211790 PO |
649 | sclp_vt220_init_count++; |
650 | if (sclp_vt220_init_count != 1) | |
1da177e4 | 651 | return 0; |
1da177e4 LT |
652 | spin_lock_init(&sclp_vt220_lock); |
653 | INIT_LIST_HEAD(&sclp_vt220_empty); | |
654 | INIT_LIST_HEAD(&sclp_vt220_outqueue); | |
1da177e4 | 655 | init_timer(&sclp_vt220_timer); |
092f7377 | 656 | tty_port_init(&sclp_vt220_port); |
1da177e4 LT |
657 | sclp_vt220_current_request = NULL; |
658 | sclp_vt220_buffered_chars = 0; | |
1da177e4 LT |
659 | sclp_vt220_flush_later = 0; |
660 | ||
661 | /* Allocate pages for output buffering */ | |
5c0792f6 | 662 | rc = -ENOMEM; |
5aaaf9f0 | 663 | for (i = 0; i < num_pages; i++) { |
5c0792f6 HC |
664 | page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
665 | if (!page) | |
ad211790 | 666 | goto out; |
5c0792f6 | 667 | list_add_tail(page, &sclp_vt220_empty); |
1da177e4 | 668 | } |
59eb1ca7 | 669 | rc = sclp_register(&sclp_vt220_register); |
ad211790 | 670 | out: |
59eb1ca7 | 671 | if (rc) { |
ad211790 PO |
672 | __sclp_vt220_free_pages(); |
673 | sclp_vt220_init_count--; | |
191c5f10 | 674 | tty_port_destroy(&sclp_vt220_port); |
59eb1ca7 CB |
675 | } |
676 | return rc; | |
1da177e4 LT |
677 | } |
678 | ||
b68e31d0 | 679 | static const struct tty_operations sclp_vt220_ops = { |
1da177e4 LT |
680 | .open = sclp_vt220_open, |
681 | .close = sclp_vt220_close, | |
682 | .write = sclp_vt220_write, | |
683 | .put_char = sclp_vt220_put_char, | |
684 | .flush_chars = sclp_vt220_flush_chars, | |
685 | .write_room = sclp_vt220_write_room, | |
686 | .chars_in_buffer = sclp_vt220_chars_in_buffer, | |
5aaaf9f0 | 687 | .flush_buffer = sclp_vt220_flush_buffer, |
1da177e4 LT |
688 | }; |
689 | ||
690 | /* | |
691 | * Register driver with SCLP and Linux and initialize internal tty structures. | |
692 | */ | |
5aaaf9f0 | 693 | static int __init sclp_vt220_tty_init(void) |
1da177e4 LT |
694 | { |
695 | struct tty_driver *driver; | |
696 | int rc; | |
697 | ||
698 | /* Note: we're not testing for CONSOLE_IS_SCLP here to preserve | |
699 | * symmetry between VM and LPAR systems regarding ttyS1. */ | |
700 | driver = alloc_tty_driver(1); | |
701 | if (!driver) | |
702 | return -ENOMEM; | |
ad211790 | 703 | rc = __sclp_vt220_init(MAX_KMEM_PAGES); |
5aaaf9f0 HC |
704 | if (rc) |
705 | goto out_driver; | |
1da177e4 | 706 | |
1da177e4 LT |
707 | driver->driver_name = SCLP_VT220_DRIVER_NAME; |
708 | driver->name = SCLP_VT220_DEVICE_NAME; | |
709 | driver->major = SCLP_VT220_MAJOR; | |
710 | driver->minor_start = SCLP_VT220_MINOR; | |
711 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
712 | driver->subtype = SYSTEM_TYPE_TTY; | |
713 | driver->init_termios = tty_std_termios; | |
714 | driver->flags = TTY_DRIVER_REAL_RAW; | |
715 | tty_set_operations(driver, &sclp_vt220_ops); | |
b19e2ca7 | 716 | tty_port_link_device(&sclp_vt220_port, driver, 0); |
1da177e4 LT |
717 | |
718 | rc = tty_register_driver(driver); | |
a12c53f4 | 719 | if (rc) |
59eb1ca7 | 720 | goto out_init; |
e106e4ea PO |
721 | rc = sclp_register(&sclp_vt220_register_input); |
722 | if (rc) | |
723 | goto out_reg; | |
1da177e4 LT |
724 | sclp_vt220_driver = driver; |
725 | return 0; | |
1da177e4 | 726 | |
e106e4ea PO |
727 | out_reg: |
728 | tty_unregister_driver(driver); | |
5aaaf9f0 | 729 | out_init: |
ad211790 | 730 | __sclp_vt220_cleanup(); |
5aaaf9f0 HC |
731 | out_driver: |
732 | put_tty_driver(driver); | |
733 | return rc; | |
734 | } | |
735 | __initcall(sclp_vt220_tty_init); | |
1da177e4 | 736 | |
b3b59d33 HC |
737 | static void __sclp_vt220_flush_buffer(void) |
738 | { | |
739 | unsigned long flags; | |
740 | ||
741 | sclp_vt220_emit_current(); | |
742 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
743 | if (timer_pending(&sclp_vt220_timer)) | |
744 | del_timer(&sclp_vt220_timer); | |
62b74942 | 745 | while (sclp_vt220_queue_running) { |
b3b59d33 HC |
746 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); |
747 | sclp_sync_wait(); | |
748 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
749 | } | |
750 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
751 | } | |
752 | ||
62b74942 MH |
753 | /* |
754 | * Resume console: If there are cached messages, emit them. | |
755 | */ | |
756 | static void sclp_vt220_resume(void) | |
757 | { | |
758 | unsigned long flags; | |
759 | ||
760 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
761 | sclp_vt220_suspended = 0; | |
762 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
763 | sclp_vt220_emit_current(); | |
764 | } | |
765 | ||
766 | /* | |
767 | * Suspend console: Set suspend flag and flush console | |
768 | */ | |
769 | static void sclp_vt220_suspend(void) | |
770 | { | |
771 | unsigned long flags; | |
772 | ||
773 | spin_lock_irqsave(&sclp_vt220_lock, flags); | |
774 | sclp_vt220_suspended = 1; | |
775 | spin_unlock_irqrestore(&sclp_vt220_lock, flags); | |
776 | __sclp_vt220_flush_buffer(); | |
777 | } | |
778 | ||
779 | static void sclp_vt220_pm_event_fn(struct sclp_register *reg, | |
780 | enum sclp_pm_event sclp_pm_event) | |
781 | { | |
782 | switch (sclp_pm_event) { | |
783 | case SCLP_PM_EVENT_FREEZE: | |
784 | sclp_vt220_suspend(); | |
785 | break; | |
786 | case SCLP_PM_EVENT_RESTORE: | |
787 | case SCLP_PM_EVENT_THAW: | |
788 | sclp_vt220_resume(); | |
789 | break; | |
790 | } | |
791 | } | |
792 | ||
ac522b63 MH |
793 | #ifdef CONFIG_SCLP_VT220_CONSOLE |
794 | ||
795 | static void | |
796 | sclp_vt220_con_write(struct console *con, const char *buf, unsigned int count) | |
797 | { | |
798 | __sclp_vt220_write((const unsigned char *) buf, count, 1, 1, 0); | |
799 | } | |
800 | ||
801 | static struct tty_driver * | |
802 | sclp_vt220_con_device(struct console *c, int *index) | |
803 | { | |
804 | *index = 0; | |
805 | return sclp_vt220_driver; | |
806 | } | |
807 | ||
2332ce1a HS |
808 | static int |
809 | sclp_vt220_notify(struct notifier_block *self, | |
810 | unsigned long event, void *data) | |
1da177e4 LT |
811 | { |
812 | __sclp_vt220_flush_buffer(); | |
2332ce1a | 813 | return NOTIFY_OK; |
1da177e4 LT |
814 | } |
815 | ||
2332ce1a HS |
816 | static struct notifier_block on_panic_nb = { |
817 | .notifier_call = sclp_vt220_notify, | |
818 | .priority = 1, | |
819 | }; | |
820 | ||
821 | static struct notifier_block on_reboot_nb = { | |
822 | .notifier_call = sclp_vt220_notify, | |
823 | .priority = 1, | |
824 | }; | |
825 | ||
1da177e4 LT |
826 | /* Structure needed to register with printk */ |
827 | static struct console sclp_vt220_console = | |
828 | { | |
829 | .name = SCLP_VT220_CONSOLE_NAME, | |
830 | .write = sclp_vt220_con_write, | |
831 | .device = sclp_vt220_con_device, | |
1da177e4 LT |
832 | .flags = CON_PRINTBUFFER, |
833 | .index = SCLP_VT220_CONSOLE_INDEX | |
834 | }; | |
835 | ||
836 | static int __init | |
837 | sclp_vt220_con_init(void) | |
838 | { | |
839 | int rc; | |
840 | ||
841 | if (!CONSOLE_IS_SCLP) | |
842 | return 0; | |
25b41a7b | 843 | rc = __sclp_vt220_init(sclp_console_pages); |
1da177e4 LT |
844 | if (rc) |
845 | return rc; | |
846 | /* Attach linux console */ | |
2332ce1a HS |
847 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); |
848 | register_reboot_notifier(&on_reboot_nb); | |
1da177e4 LT |
849 | register_console(&sclp_vt220_console); |
850 | return 0; | |
851 | } | |
852 | ||
853 | console_initcall(sclp_vt220_con_init); | |
854 | #endif /* CONFIG_SCLP_VT220_CONSOLE */ | |
855 |