blob: 003663288e29b7f60405fa9bf721dcc6dbe19c0c [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{
110 unsigned long flags;
111 void *page;
112
113 do {
114 page = sclp_unmake_buffer(buffer);
115 spin_lock_irqsave(&sclp_tty_lock, flags);
116 /* Remove buffer from outqueue */
117 list_del(&buffer->list);
118 sclp_tty_buffer_count--;
119 list_add_tail((struct list_head *) page, &sclp_tty_pages);
120 /* Check if there is a pending buffer on the out queue. */
121 buffer = NULL;
122 if (!list_empty(&sclp_tty_outqueue))
123 buffer = list_entry(sclp_tty_outqueue.next,
124 struct sclp_buffer, list);
125 spin_unlock_irqrestore(&sclp_tty_lock, flags);
126 } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
Jiri Slaby6aad04f2013-03-07 13:12:29 +0100127
128 tty_port_tty_wakeup(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131static inline void
132__sclp_ttybuf_emit(struct sclp_buffer *buffer)
133{
134 unsigned long flags;
135 int count;
136 int rc;
137
138 spin_lock_irqsave(&sclp_tty_lock, flags);
139 list_add_tail(&buffer->list, &sclp_tty_outqueue);
140 count = sclp_tty_buffer_count++;
141 spin_unlock_irqrestore(&sclp_tty_lock, flags);
142 if (count)
143 return;
144 rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
145 if (rc)
146 sclp_ttybuf_callback(buffer, rc);
147}
148
149/*
150 * When this routine is called from the timer then we flush the
151 * temporary write buffer.
152 */
153static void
154sclp_tty_timeout(unsigned long data)
155{
156 unsigned long flags;
157 struct sclp_buffer *buf;
158
159 spin_lock_irqsave(&sclp_tty_lock, flags);
160 buf = sclp_ttybuf;
161 sclp_ttybuf = NULL;
162 spin_unlock_irqrestore(&sclp_tty_lock, flags);
163
164 if (buf != NULL) {
165 __sclp_ttybuf_emit(buf);
166 }
167}
168
169/*
170 * Write a string to the sclp tty.
171 */
Heiko Carstens5e345992008-07-14 09:59:46 +0200172static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
174 unsigned long flags;
175 void *page;
176 int written;
Heiko Carstens5e345992008-07-14 09:59:46 +0200177 int overall_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct sclp_buffer *buf;
179
180 if (count <= 0)
Heiko Carstens5e345992008-07-14 09:59:46 +0200181 return 0;
182 overall_written = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 spin_lock_irqsave(&sclp_tty_lock, flags);
184 do {
185 /* Create a sclp output buffer if none exists yet */
186 if (sclp_ttybuf == NULL) {
187 while (list_empty(&sclp_tty_pages)) {
188 spin_unlock_irqrestore(&sclp_tty_lock, flags);
Heiko Carstens5e345992008-07-14 09:59:46 +0200189 if (may_fail)
190 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 else
Heiko Carstens5e345992008-07-14 09:59:46 +0200192 sclp_sync_wait();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 spin_lock_irqsave(&sclp_tty_lock, flags);
194 }
195 page = sclp_tty_pages.next;
196 list_del((struct list_head *) page);
Heiko Carstens095761d2008-07-14 09:59:45 +0200197 sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns,
198 SPACES_PER_TAB);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 }
200 /* try to write the string to the current output buffer */
201 written = sclp_write(sclp_ttybuf, str, count);
Heiko Carstens5e345992008-07-14 09:59:46 +0200202 overall_written += written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (written == count)
204 break;
205 /*
206 * Not all characters could be written to the current
207 * output buffer. Emit the buffer, create a new buffer
208 * and then output the rest of the string.
209 */
210 buf = sclp_ttybuf;
211 sclp_ttybuf = NULL;
212 spin_unlock_irqrestore(&sclp_tty_lock, flags);
213 __sclp_ttybuf_emit(buf);
214 spin_lock_irqsave(&sclp_tty_lock, flags);
215 str += written;
216 count -= written;
217 } while (count > 0);
218 /* Setup timer to output current console buffer after 1/10 second */
Heiko Carstens095761d2008-07-14 09:59:45 +0200219 if (sclp_ttybuf && sclp_chars_in_buffer(sclp_ttybuf) &&
220 !timer_pending(&sclp_tty_timer)) {
221 init_timer(&sclp_tty_timer);
222 sclp_tty_timer.function = sclp_tty_timeout;
223 sclp_tty_timer.data = 0UL;
224 sclp_tty_timer.expires = jiffies + HZ/10;
225 add_timer(&sclp_tty_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227 spin_unlock_irqrestore(&sclp_tty_lock, flags);
Heiko Carstens5e345992008-07-14 09:59:46 +0200228out:
229 return overall_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232/*
233 * This routine is called by the kernel to write a series of characters to the
234 * tty device. The characters may come from user space or kernel space. This
235 * routine will return the number of characters actually accepted for writing.
236 */
237static int
238sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
239{
240 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200241 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 sclp_tty_chars_count = 0;
243 }
Heiko Carstens5e345992008-07-14 09:59:46 +0200244 return sclp_tty_write_string(buf, count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
247/*
248 * This routine is called by the kernel to write a single character to the tty
249 * device. If the kernel uses this routine, it must call the flush_chars()
250 * routine (if defined) when it is done stuffing characters into the driver.
251 *
252 * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
253 * If the given character is a '\n' the contents of the SCLP write buffer
254 * - including previous characters from sclp_tty_put_char() and strings from
255 * sclp_write() without final '\n' - will be written.
256 */
Alan Cox9e7c9a12008-04-30 00:54:00 -0700257static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
259{
260 sclp_tty_chars[sclp_tty_chars_count++] = ch;
261 if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200262 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 sclp_tty_chars_count = 0;
Heiko Carstens5e345992008-07-14 09:59:46 +0200264 }
265 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267
268/*
269 * This routine is called by the kernel after it has written a series of
270 * characters to the tty device using put_char().
271 */
272static void
273sclp_tty_flush_chars(struct tty_struct *tty)
274{
275 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200276 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 sclp_tty_chars_count = 0;
278 }
279}
280
281/*
282 * This routine returns the number of characters in the write buffer of the
283 * SCLP driver. The provided number includes all characters that are stored
284 * in the SCCB (will be written next time the SCLP is not busy) as well as
285 * characters in the write buffer (will not be written as long as there is a
286 * final line feed missing).
287 */
288static int
289sclp_tty_chars_in_buffer(struct tty_struct *tty)
290{
291 unsigned long flags;
292 struct list_head *l;
293 struct sclp_buffer *t;
294 int count;
295
296 spin_lock_irqsave(&sclp_tty_lock, flags);
297 count = 0;
298 if (sclp_ttybuf != NULL)
299 count = sclp_chars_in_buffer(sclp_ttybuf);
300 list_for_each(l, &sclp_tty_outqueue) {
301 t = list_entry(l, struct sclp_buffer, list);
302 count += sclp_chars_in_buffer(t);
303 }
304 spin_unlock_irqrestore(&sclp_tty_lock, flags);
305 return count;
306}
307
308/*
309 * removes all content from buffers of low level driver
310 */
311static void
312sclp_tty_flush_buffer(struct tty_struct *tty)
313{
314 if (sclp_tty_chars_count > 0) {
Heiko Carstens5e345992008-07-14 09:59:46 +0200315 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 sclp_tty_chars_count = 0;
317 }
318}
319
320/*
321 * push input to tty
322 */
323static void
324sclp_tty_input(unsigned char* buf, unsigned int count)
325{
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200326 struct tty_struct *tty = tty_port_tty_get(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 unsigned int cchar;
328
329 /*
330 * If this tty driver is currently closed
331 * then throw the received input away.
332 */
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200333 if (tty == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 return;
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200335 cchar = ctrlchar_handle(buf, count, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 switch (cchar & CTRLCHAR_MASK) {
337 case CTRLCHAR_SYSRQ:
338 break;
339 case CTRLCHAR_CTRL:
Jiri Slaby92a19f92013-01-03 15:53:03 +0100340 tty_insert_flip_char(&sclp_port, cchar, TTY_NORMAL);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100341 tty_flip_buffer_push(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 break;
343 case CTRLCHAR_NONE:
344 /* send (normal) input to line discipline */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 if (count < 2 ||
Alan Cox33f0f882006-01-09 20:54:13 -0800346 (strncmp((const char *) buf + count - 2, "^n", 2) &&
347 strncmp((const char *) buf + count - 2, "\252n", 2))) {
348 /* add the auto \n */
Jiri Slaby05c7cd32013-01-03 15:53:04 +0100349 tty_insert_flip_string(&sclp_port, buf, count);
Jiri Slaby92a19f92013-01-03 15:53:03 +0100350 tty_insert_flip_char(&sclp_port, '\n', TTY_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 } else
Jiri Slaby05c7cd32013-01-03 15:53:04 +0100352 tty_insert_flip_string(&sclp_port, buf, count - 2);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100353 tty_flip_buffer_push(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 break;
355 }
Jiri Slaby0ea63da2012-04-02 13:54:12 +0200356 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359/*
360 * get a EBCDIC string in upper/lower case,
361 * find out characters in lower/upper case separated by a special character,
362 * modifiy original string,
363 * returns length of resulting string
364 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200365static int sclp_switch_cases(unsigned char *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
367 unsigned char *ip, *op;
368 int toggle;
369
370 /* initially changing case is off */
371 toggle = 0;
372 ip = op = buf;
373 while (count-- > 0) {
374 /* compare with special character */
Heiko Carstens095761d2008-07-14 09:59:45 +0200375 if (*ip == CASE_DELIMITER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 /* followed by another special character? */
Heiko Carstens095761d2008-07-14 09:59:45 +0200377 if (count && ip[1] == CASE_DELIMITER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 /*
379 * ... then put a single copy of the special
380 * character to the output string
381 */
382 *op++ = *ip++;
383 count--;
384 } else
385 /*
386 * ... special character follower by a normal
387 * character toggles the case change behaviour
388 */
389 toggle = ~toggle;
390 /* skip special character */
391 ip++;
392 } else
393 /* not the special character */
394 if (toggle)
395 /* but case switching is on */
Heiko Carstens095761d2008-07-14 09:59:45 +0200396 if (sclp_tty_tolower)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 /* switch to uppercase */
398 *op++ = _ebc_toupper[(int) *ip++];
399 else
400 /* switch to lowercase */
401 *op++ = _ebc_tolower[(int) *ip++];
402 else
403 /* no case switching, copy the character */
404 *op++ = *ip++;
405 }
406 /* return length of reformatted string. */
407 return op - buf;
408}
409
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200410static void sclp_get_input(struct gds_subvector *sv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200412 unsigned char *str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 int count;
414
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200415 str = (unsigned char *) (sv + 1);
416 count = sv->length - sizeof(*sv);
Heiko Carstens095761d2008-07-14 09:59:45 +0200417 if (sclp_tty_tolower)
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200418 EBC_TOLOWER(str, count);
419 count = sclp_switch_cases(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 /* convert EBCDIC to ASCII (modify original input in SCCB) */
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200421 sclp_ebcasc_str(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 /* transfer input to high level driver */
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200424 sclp_tty_input(str, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200427static inline void sclp_eval_selfdeftextmsg(struct gds_subvector *sv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200429 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200431 end = (void *) sv + sv->length;
432 for (sv = sv + 1; (void *) sv < end; sv = (void *) sv + sv->length)
433 if (sv->key == 0x30)
434 sclp_get_input(sv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435}
436
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200437static inline void sclp_eval_textcmd(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200439 struct gds_subvector *sv;
440 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200442 end = (void *) v + v->length;
443 for (sv = (struct gds_subvector *) (v + 1);
444 (void *) sv < end; sv = (void *) sv + sv->length)
445 if (sv->key == GDS_KEY_SELFDEFTEXTMSG)
446 sclp_eval_selfdeftextmsg(sv);
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200450static inline void sclp_eval_cpmsu(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200452 void *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200454 end = (void *) v + v->length;
455 for (v = v + 1; (void *) v < end; v = (void *) v + v->length)
456 if (v->gds_id == GDS_ID_TEXTCMD)
457 sclp_eval_textcmd(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
460
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200461static inline void sclp_eval_mdsmu(struct gds_vector *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200463 v = sclp_find_gds_vector(v + 1, (void *) v + v->length, GDS_ID_CPMSU);
464 if (v)
465 sclp_eval_cpmsu(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200468static void sclp_tty_receiver(struct evbuf_header *evbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200470 struct gds_vector *v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
Martin Schwidefsky30c2df52011-05-23 10:24:42 +0200472 v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
473 GDS_ID_MDSMU);
474 if (v)
475 sclp_eval_mdsmu(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476}
477
478static void
479sclp_tty_state_change(struct sclp_register *reg)
480{
481}
482
483static struct sclp_register sclp_input_event =
484{
Stefan Haberland6d4740c2007-04-27 16:01:53 +0200485 .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 .state_change_fn = sclp_tty_state_change,
487 .receiver_fn = sclp_tty_receiver
488};
489
Jeff Dikeb68e31d2006-10-02 02:17:18 -0700490static const struct tty_operations sclp_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 .open = sclp_tty_open,
492 .close = sclp_tty_close,
493 .write = sclp_tty_write,
494 .put_char = sclp_tty_put_char,
495 .flush_chars = sclp_tty_flush_chars,
496 .write_room = sclp_tty_write_room,
497 .chars_in_buffer = sclp_tty_chars_in_buffer,
498 .flush_buffer = sclp_tty_flush_buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499};
500
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100501static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502sclp_tty_init(void)
503{
504 struct tty_driver *driver;
505 void *page;
506 int i;
507 int rc;
508
509 if (!CONSOLE_IS_SCLP)
510 return 0;
511 driver = alloc_tty_driver(1);
512 if (!driver)
513 return -ENOMEM;
514
515 rc = sclp_rw_init();
516 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 put_tty_driver(driver);
518 return rc;
519 }
520 /* Allocate pages for output buffering */
521 INIT_LIST_HEAD(&sclp_tty_pages);
522 for (i = 0; i < MAX_KMEM_PAGES; i++) {
523 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
524 if (page == NULL) {
525 put_tty_driver(driver);
526 return -ENOMEM;
527 }
528 list_add_tail((struct list_head *) page, &sclp_tty_pages);
529 }
530 INIT_LIST_HEAD(&sclp_tty_outqueue);
531 spin_lock_init(&sclp_tty_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 init_timer(&sclp_tty_timer);
533 sclp_ttybuf = NULL;
534 sclp_tty_buffer_count = 0;
535 if (MACHINE_IS_VM) {
536 /*
537 * save 4 characters for the CPU number
538 * written at start of each line by VM/CP
539 */
Heiko Carstens095761d2008-07-14 09:59:45 +0200540 sclp_tty_columns = 76;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 /* case input lines to lowercase */
Heiko Carstens095761d2008-07-14 09:59:45 +0200542 sclp_tty_tolower = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 sclp_tty_chars_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
546 rc = sclp_register(&sclp_input_event);
547 if (rc) {
548 put_tty_driver(driver);
549 return rc;
550 }
551
Jiri Slaby191c5f12012-11-15 09:49:56 +0100552 tty_port_init(&sclp_port);
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 driver->driver_name = "sclp_line";
555 driver->name = "sclp_line";
556 driver->major = TTY_MAJOR;
557 driver->minor_start = 64;
558 driver->type = TTY_DRIVER_TYPE_SYSTEM;
559 driver->subtype = SYSTEM_TYPE_TTY;
560 driver->init_termios = tty_std_termios;
561 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
Martin Schwidefskyb8a2bbd2014-08-13 14:24:58 +0200562 driver->init_termios.c_oflag = ONLCR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 driver->init_termios.c_lflag = ISIG | ECHO;
564 driver->flags = TTY_DRIVER_REAL_RAW;
565 tty_set_operations(driver, &sclp_ops);
Jiri Slabyb19e2ca2012-08-07 21:47:51 +0200566 tty_port_link_device(&sclp_port, driver, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 rc = tty_register_driver(driver);
568 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 put_tty_driver(driver);
Jiri Slaby191c5f12012-11-15 09:49:56 +0100570 tty_port_destroy(&sclp_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return rc;
572 }
573 sclp_tty_driver = driver;
574 return 0;
575}
576module_init(sclp_tty_init);