blob: 14b4cb8abcc8ffb41c6c56121c97bca90616ea11 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * SCLP line mode terminal driver.
3 *
4 * S390 version
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02005 * Copyright IBM Corp. 1999
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
7 * Martin Schwidefsky <schwidefsky@de.ibm.com>
8 */
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/module.h>
11#include <linux/kmod.h>
12#include <linux/tty.h>
13#include <linux/tty_driver.h>
Alan Cox33f0f882006-01-09 20:54:13 -080014#include <linux/tty_flip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/uaccess.h>
20
21#include "ctrlchar.h"
22#include "sclp.h"
23#include "sclp_rw.h"
24#include "sclp_tty.h"
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026/*
27 * size of a buffer that collects single characters coming in
28 * via sclp_tty_put_char()
29 */
30#define SCLP_TTY_BUF_SIZE 512
31
32/*
33 * There is exactly one SCLP terminal, so we can keep things simple
34 * and allocate all variables statically.
35 */
36
37/* Lock to guard over changes to global variables. */
38static spinlock_t sclp_tty_lock;
39/* List of free pages that can be used for console output buffering. */
40static struct list_head sclp_tty_pages;
41/* List of full struct sclp_buffer structures ready for output. */
42static struct list_head sclp_tty_outqueue;
43/* Counter how many buffers are emitted. */
44static int sclp_tty_buffer_count;
45/* Pointer to current console buffer. */
46static struct sclp_buffer *sclp_ttybuf;
47/* Timer for delayed output of console messages. */
48static struct timer_list sclp_tty_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Jiri Slaby0ea63da2012-04-02 13:54:12 +020050static struct tty_port sclp_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
52static unsigned short int sclp_tty_chars_count;
53
54struct tty_driver *sclp_tty_driver;
55
Heiko Carstens095761d2008-07-14 09:59:45 +020056static int sclp_tty_tolower;
57static int sclp_tty_columns = 80;
58
59#define SPACES_PER_TAB 8
60#define CASE_DELIMITER 0x6c /* to separate upper and lower case (% in EBCDIC) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62/* This routine is called whenever we try to open a SCLP terminal. */
63static int
64sclp_tty_open(struct tty_struct *tty, struct file *filp)
65{
Jiri Slaby0ea63da2012-04-02 13:54:12 +020066 tty_port_tty_set(&sclp_port, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 tty->driver_data = NULL;
Jiri Slabyd6c53c02013-01-03 15:53:05 +010068 sclp_port.low_latency = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return 0;
70}
71
72/* This routine is called when the SCLP terminal is closed. */
73static void
74sclp_tty_close(struct tty_struct *tty, struct file *filp)
75{
76 if (tty->count > 1)
77 return;
Jiri Slaby0ea63da2012-04-02 13:54:12 +020078 tty_port_tty_set(&sclp_port, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/*
82 * This routine returns the numbers of characters the tty driver
83 * will accept for queuing to be written. This number is subject
84 * to change as output buffers get emptied, or if the output flow
85 * control is acted. This is not an exact number because not every
86 * character needs the same space in the sccb. The worst case is
87 * a string of newlines. Every newlines creates a new mto which
88 * needs 8 bytes.
89 */
90static int
91sclp_tty_write_room (struct tty_struct *tty)
92{
93 unsigned long flags;
94 struct list_head *l;
95 int count;
96
97 spin_lock_irqsave(&sclp_tty_lock, flags);
98 count = 0;
99 if (sclp_ttybuf != NULL)
100 count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
101 list_for_each(l, &sclp_tty_pages)
102 count += NR_EMPTY_MTO_PER_SCCB;
103 spin_unlock_irqrestore(&sclp_tty_lock, flags);
104 return count;
105}
106
107static void
108sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
109{
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200110 struct tty_struct *tty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 unsigned long flags;
112 void *page;
113
114 do {
115 page = sclp_unmake_buffer(buffer);
116 spin_lock_irqsave(&sclp_tty_lock, flags);
117 /* Remove buffer from outqueue */
118 list_del(&buffer->list);
119 sclp_tty_buffer_count--;
120 list_add_tail((struct list_head *) page, &sclp_tty_pages);
121 /* Check if there is a pending buffer on the out queue. */
122 buffer = NULL;
123 if (!list_empty(&sclp_tty_outqueue))
124 buffer = list_entry(sclp_tty_outqueue.next,
125 struct sclp_buffer, list);
126 spin_unlock_irqrestore(&sclp_tty_lock, flags);
127 } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 /* check if the tty needs a wake up call */
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200129 tty = tty_port_tty_get(&sclp_port);
130 if (tty != NULL) {
131 tty_wakeup(tty);
132 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
134}
135
136static inline void
137__sclp_ttybuf_emit(struct sclp_buffer *buffer)
138{
139 unsigned long flags;
140 int count;
141 int rc;
142
143 spin_lock_irqsave(&sclp_tty_lock, flags);
144 list_add_tail(&buffer->list, &sclp_tty_outqueue);
145 count = sclp_tty_buffer_count++;
146 spin_unlock_irqrestore(&sclp_tty_lock, flags);
147 if (count)
148 return;
149 rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
150 if (rc)
151 sclp_ttybuf_callback(buffer, rc);
152}
153
154/*
155 * When this routine is called from the timer then we flush the
156 * temporary write buffer.
157 */
158static void
159sclp_tty_timeout(unsigned long data)
160{
161 unsigned long flags;
162 struct sclp_buffer *buf;
163
164 spin_lock_irqsave(&sclp_tty_lock, flags);
165 buf = sclp_ttybuf;
166 sclp_ttybuf = NULL;
167 spin_unlock_irqrestore(&sclp_tty_lock, flags);
168
169 if (buf != NULL) {
170 __sclp_ttybuf_emit(buf);
171 }
172}
173
174/*
175 * Write a string to the sclp tty.
176 */
Heiko Carstens5e345992008-07-14 09:59:46 +0200177static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
179 unsigned long flags;
180 void *page;
181 int written;
Heiko Carstens5e345992008-07-14 09:59:46 +0200182 int overall_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 struct sclp_buffer *buf;
184
185 if (count <= 0)
Heiko Carstens5e345992008-07-14 09:59:46 +0200186 return 0;
187 overall_written = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 spin_lock_irqsave(&sclp_tty_lock, flags);
189 do {
190 /* Create a sclp output buffer if none exists yet */
191 if (sclp_ttybuf == NULL) {
192 while (list_empty(&sclp_tty_pages)) {
193 spin_unlock_irqrestore(&sclp_tty_lock, flags);
Heiko Carstens5e345992008-07-14 09:59:46 +0200194 if (may_fail)
195 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 else
Heiko Carstens5e345992008-07-14 09:59:46 +0200197 sclp_sync_wait();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 spin_lock_irqsave(&sclp_tty_lock, flags);
199 }
200 page = sclp_tty_pages.next;
201 list_del((struct list_head *) page);
Heiko Carstens095761d2008-07-14 09:59:45 +0200202 sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns,
203 SPACES_PER_TAB);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 }
205 /* try to write the string to the current output buffer */
206 written = sclp_write(sclp_ttybuf, str, count);
Heiko Carstens5e345992008-07-14 09:59:46 +0200207 overall_written += written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (written == count)
209 break;
210 /*
211 * Not all characters could be written to the current
212 * output buffer. Emit the buffer, create a new buffer
213 * and then output the rest of the string.
214 */
215 buf = sclp_ttybuf;
216 sclp_ttybuf = NULL;
217 spin_unlock_irqrestore(&sclp_tty_lock, flags);
218 __sclp_ttybuf_emit(buf);
219 spin_lock_irqsave(&sclp_tty_lock, flags);
220 str += written;
221 count -= written;
222 } while (count > 0);
223 /* Setup timer to output current console buffer after 1/10 second */
Heiko Carstens095761d2008-07-14 09:59:45 +0200224 if (sclp_ttybuf && sclp_chars_in_buffer(sclp_ttybuf) &&
225 !timer_pending(&sclp_tty_timer)) {
226 init_timer(&sclp_tty_timer);
227 sclp_tty_timer.function = sclp_tty_timeout;
228 sclp_tty_timer.data = 0UL;
229 sclp_tty_timer.expires = jiffies + HZ/10;
230 add_timer(&sclp_tty_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232 spin_unlock_irqrestore(&sclp_tty_lock, flags);
Heiko Carstens5e345992008-07-14 09:59:46 +0200233out:
234 return overall_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237/*
238 * This routine is called by the kernel to write a series of characters to the
239 * tty device. The characters may come from user space or kernel space. This
240 * routine will return the number of characters actually accepted for writing.
241 */
242static int
243sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
244{
245 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200246 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 sclp_tty_chars_count = 0;
248 }
Heiko Carstens5e345992008-07-14 09:59:46 +0200249 return sclp_tty_write_string(buf, count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
251
252/*
253 * This routine is called by the kernel to write a single character to the tty
254 * device. If the kernel uses this routine, it must call the flush_chars()
255 * routine (if defined) when it is done stuffing characters into the driver.
256 *
257 * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
258 * If the given character is a '\n' the contents of the SCLP write buffer
259 * - including previous characters from sclp_tty_put_char() and strings from
260 * sclp_write() without final '\n' - will be written.
261 */
Alan Cox9e7c9a12008-04-30 00:54:00 -0700262static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
264{
265 sclp_tty_chars[sclp_tty_chars_count++] = ch;
266 if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200267 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 sclp_tty_chars_count = 0;
Heiko Carstens5e345992008-07-14 09:59:46 +0200269 }
270 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
273/*
274 * This routine is called by the kernel after it has written a series of
275 * characters to the tty device using put_char().
276 */
277static void
278sclp_tty_flush_chars(struct tty_struct *tty)
279{
280 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200281 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 sclp_tty_chars_count = 0;
283 }
284}
285
286/*
287 * This routine returns the number of characters in the write buffer of the
288 * SCLP driver. The provided number includes all characters that are stored
289 * in the SCCB (will be written next time the SCLP is not busy) as well as
290 * characters in the write buffer (will not be written as long as there is a
291 * final line feed missing).
292 */
293static int
294sclp_tty_chars_in_buffer(struct tty_struct *tty)
295{
296 unsigned long flags;
297 struct list_head *l;
298 struct sclp_buffer *t;
299 int count;
300
301 spin_lock_irqsave(&sclp_tty_lock, flags);
302 count = 0;
303 if (sclp_ttybuf != NULL)
304 count = sclp_chars_in_buffer(sclp_ttybuf);
305 list_for_each(l, &sclp_tty_outqueue) {
306 t = list_entry(l, struct sclp_buffer, list);
307 count += sclp_chars_in_buffer(t);
308 }
309 spin_unlock_irqrestore(&sclp_tty_lock, flags);
310 return count;
311}
312
313/*
314 * removes all content from buffers of low level driver
315 */
316static void
317sclp_tty_flush_buffer(struct tty_struct *tty)
318{
319 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200320 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 sclp_tty_chars_count = 0;
322 }
323}
324
325/*
326 * push input to tty
327 */
328static void
329sclp_tty_input(unsigned char* buf, unsigned int count)
330{
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200331 struct tty_struct *tty = tty_port_tty_get(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 unsigned int cchar;
333
334 /*
335 * If this tty driver is currently closed
336 * then throw the received input away.
337 */
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200338 if (tty == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 return;
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200340 cchar = ctrlchar_handle(buf, count, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 switch (cchar & CTRLCHAR_MASK) {
342 case CTRLCHAR_SYSRQ:
343 break;
344 case CTRLCHAR_CTRL:
Jiri Slaby92a19f92013-01-03 15:53:03 +0100345 tty_insert_flip_char(&sclp_port, cchar, TTY_NORMAL);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100346 tty_flip_buffer_push(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 break;
348 case CTRLCHAR_NONE:
349 /* send (normal) input to line discipline */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 if (count < 2 ||
Alan Cox33f0f882006-01-09 20:54:13 -0800351 (strncmp((const char *) buf + count - 2, "^n", 2) &&
352 strncmp((const char *) buf + count - 2, "\252n", 2))) {
353 /* add the auto \n */
Jiri Slaby05c7cd32013-01-03 15:53:04 +0100354 tty_insert_flip_string(&sclp_port, buf, count);
Jiri Slaby92a19f92013-01-03 15:53:03 +0100355 tty_insert_flip_char(&sclp_port, '\n', TTY_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 } else
Jiri Slaby05c7cd32013-01-03 15:53:04 +0100357 tty_insert_flip_string(&sclp_port, buf, count - 2);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100358 tty_flip_buffer_push(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 break;
360 }
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200361 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363
364/*
365 * get a EBCDIC string in upper/lower case,
366 * find out characters in lower/upper case separated by a special character,
367 * modifiy original string,
368 * returns length of resulting string
369 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200370static int sclp_switch_cases(unsigned char *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
372 unsigned char *ip, *op;
373 int toggle;
374
375 /* initially changing case is off */
376 toggle = 0;
377 ip = op = buf;
378 while (count-- > 0) {
379 /* compare with special character */
Heiko Carstens095761d2008-07-14 09:59:45 +0200380 if (*ip == CASE_DELIMITER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 /* followed by another special character? */
Heiko Carstens095761d2008-07-14 09:59:45 +0200382 if (count && ip[1] == CASE_DELIMITER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 /*
384 * ... then put a single copy of the special
385 * character to the output string
386 */
387 *op++ = *ip++;
388 count--;
389 } else
390 /*
391 * ... special character follower by a normal
392 * character toggles the case change behaviour
393 */
394 toggle = ~toggle;
395 /* skip special character */
396 ip++;
397 } else
398 /* not the special character */
399 if (toggle)
400 /* but case switching is on */
Heiko Carstens095761d2008-07-14 09:59:45 +0200401 if (sclp_tty_tolower)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 /* switch to uppercase */
403 *op++ = _ebc_toupper[(int) *ip++];
404 else
405 /* switch to lowercase */
406 *op++ = _ebc_tolower[(int) *ip++];
407 else
408 /* no case switching, copy the character */
409 *op++ = *ip++;
410 }
411 /* return length of reformatted string. */
412 return op - buf;
413}
414
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200415static void sclp_get_input(struct gds_subvector *sv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200417 unsigned char *str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 int count;
419
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200420 str = (unsigned char *) (sv + 1);
421 count = sv->length - sizeof(*sv);
Heiko Carstens095761d2008-07-14 09:59:45 +0200422 if (sclp_tty_tolower)
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200423 EBC_TOLOWER(str, count);
424 count = sclp_switch_cases(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 /* convert EBCDIC to ASCII (modify original input in SCCB) */
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200426 sclp_ebcasc_str(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 /* transfer input to high level driver */
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200429 sclp_tty_input(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200432static inline void sclp_eval_selfdeftextmsg(struct gds_subvector *sv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200434 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200436 end = (void *) sv + sv->length;
437 for (sv = sv + 1; (void *) sv < end; sv = (void *) sv + sv->length)
438 if (sv->key == 0x30)
439 sclp_get_input(sv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200442static inline void sclp_eval_textcmd(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200444 struct gds_subvector *sv;
445 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200447 end = (void *) v + v->length;
448 for (sv = (struct gds_subvector *) (v + 1);
449 (void *) sv < end; sv = (void *) sv + sv->length)
450 if (sv->key == GDS_KEY_SELFDEFTEXTMSG)
451 sclp_eval_selfdeftextmsg(sv);
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200455static inline void sclp_eval_cpmsu(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200457 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200459 end = (void *) v + v->length;
460 for (v = v + 1; (void *) v < end; v = (void *) v + v->length)
461 if (v->gds_id == GDS_ID_TEXTCMD)
462 sclp_eval_textcmd(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}
464
465
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200466static inline void sclp_eval_mdsmu(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200468 v = sclp_find_gds_vector(v + 1, (void *) v + v->length, GDS_ID_CPMSU);
469 if (v)
470 sclp_eval_cpmsu(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200473static void sclp_tty_receiver(struct evbuf_header *evbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200475 struct gds_vector *v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200477 v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
478 GDS_ID_MDSMU);
479 if (v)
480 sclp_eval_mdsmu(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481}
482
483static void
484sclp_tty_state_change(struct sclp_register *reg)
485{
486}
487
488static struct sclp_register sclp_input_event =
489{
Stefan Haberland6d4740c2007-04-27 16:01:53 +0200490 .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 .state_change_fn = sclp_tty_state_change,
492 .receiver_fn = sclp_tty_receiver
493};
494
Jeff Dikeb68e31d2006-10-02 02:17:18 -0700495static const struct tty_operations sclp_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 .open = sclp_tty_open,
497 .close = sclp_tty_close,
498 .write = sclp_tty_write,
499 .put_char = sclp_tty_put_char,
500 .flush_chars = sclp_tty_flush_chars,
501 .write_room = sclp_tty_write_room,
502 .chars_in_buffer = sclp_tty_chars_in_buffer,
503 .flush_buffer = sclp_tty_flush_buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504};
505
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100506static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507sclp_tty_init(void)
508{
509 struct tty_driver *driver;
510 void *page;
511 int i;
512 int rc;
513
514 if (!CONSOLE_IS_SCLP)
515 return 0;
516 driver = alloc_tty_driver(1);
517 if (!driver)
518 return -ENOMEM;
519
520 rc = sclp_rw_init();
521 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 put_tty_driver(driver);
523 return rc;
524 }
525 /* Allocate pages for output buffering */
526 INIT_LIST_HEAD(&sclp_tty_pages);
527 for (i = 0; i < MAX_KMEM_PAGES; i++) {
528 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
529 if (page == NULL) {
530 put_tty_driver(driver);
531 return -ENOMEM;
532 }
533 list_add_tail((struct list_head *) page, &sclp_tty_pages);
534 }
535 INIT_LIST_HEAD(&sclp_tty_outqueue);
536 spin_lock_init(&sclp_tty_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 init_timer(&sclp_tty_timer);
538 sclp_ttybuf = NULL;
539 sclp_tty_buffer_count = 0;
540 if (MACHINE_IS_VM) {
541 /*
542 * save 4 characters for the CPU number
543 * written at start of each line by VM/CP
544 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200545 sclp_tty_columns = 76;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 /* case input lines to lowercase */
Heiko Carstens095761d2008-07-14 09:59:45 +0200547 sclp_tty_tolower = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 sclp_tty_chars_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 rc = sclp_register(&sclp_input_event);
552 if (rc) {
553 put_tty_driver(driver);
554 return rc;
555 }
556
Jiri Slaby191c5f12012-11-15 09:49:56 +0100557 tty_port_init(&sclp_port);
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 driver->driver_name = "sclp_line";
560 driver->name = "sclp_line";
561 driver->major = TTY_MAJOR;
562 driver->minor_start = 64;
563 driver->type = TTY_DRIVER_TYPE_SYSTEM;
564 driver->subtype = SYSTEM_TYPE_TTY;
565 driver->init_termios = tty_std_termios;
566 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
567 driver->init_termios.c_oflag = ONLCR | XTABS;
568 driver->init_termios.c_lflag = ISIG | ECHO;
569 driver->flags = TTY_DRIVER_REAL_RAW;
570 tty_set_operations(driver, &sclp_ops);
Jiri Slabyb19e2ca2012-08-07 21:47:51 +0200571 tty_port_link_device(&sclp_port, driver, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 rc = tty_register_driver(driver);
573 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 put_tty_driver(driver);
Jiri Slaby191c5f12012-11-15 09:49:56 +0100575 tty_port_destroy(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return rc;
577 }
578 sclp_tty_driver = driver;
579 return 0;
580}
581module_init(sclp_tty_init);