blob: c43aca69fb30dffed727c210b725b46a365440dd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Martin Schwidefsky77812a22009-06-16 10:30:29 +02002 * 3215 line mode terminal driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Martin Schwidefsky77812a22009-06-16 10:30:29 +02004 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
Martin Schwidefsky77812a22009-06-16 10:30:29 +02007 * Updated:
8 * Aug-2000: Added tab support
9 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kdev_t.h>
15#include <linux/tty.h>
Alan Cox33f0f882006-01-09 20:54:13 -080016#include <linux/tty_flip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/vt_kern.h>
18#include <linux/init.h>
19#include <linux/console.h>
20#include <linux/interrupt.h>
Peter Oberparleiter600b5d12006-02-01 03:06:35 -080021#include <linux/err.h>
Holger Smolinski2332ce12008-10-10 21:33:27 +020022#include <linux/reboot.h>
Jiri Slaby8dd360f2012-04-11 11:14:58 +020023#include <linux/serial.h> /* ASYNC_* flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <asm/ccwdev.h>
26#include <asm/cio.h>
27#include <asm/io.h>
28#include <asm/ebcdic.h>
29#include <asm/uaccess.h>
30#include <asm/delay.h>
31#include <asm/cpcmd.h>
32#include <asm/setup.h>
33
34#include "ctrlchar.h"
35
36#define NR_3215 1
37#define NR_3215_REQ (4*NR_3215)
38#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
39#define RAW3215_INBUF_SIZE 256 /* input buffer size */
40#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
41#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
42#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
43#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
44#define RAW3215_NR_CCWS 3
45#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
46
Heiko Carstens6673cd02013-01-03 14:31:53 +010047#define RAW3215_FIXED 1 /* 3215 console device is not be freed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define RAW3215_WORKING 4 /* set if a request is being worked on */
49#define RAW3215_THROTTLED 8 /* set if reading is disabled */
50#define RAW3215_STOPPED 16 /* set if writing is disabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
52#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
53
54#define TAB_STOP_SIZE 8 /* tab stop size */
55
56/*
57 * Request types for a 3215 device
58 */
59enum raw3215_type {
60 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
61};
62
63/*
64 * Request structure for a 3215 device
65 */
66struct raw3215_req {
67 enum raw3215_type type; /* type of the request */
68 int start, len; /* start index & len in output buffer */
69 int delayable; /* indication to wait for more data */
70 int residual; /* residual count for read request */
71 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
72 struct raw3215_info *info; /* pointer to main structure */
73 struct raw3215_req *next; /* pointer to next request */
74} __attribute__ ((aligned(8)));
75
76struct raw3215_info {
Jiri Slaby8dd360f2012-04-11 11:14:58 +020077 struct tty_port port;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 struct ccw_device *cdev; /* device for tty driver */
79 spinlock_t *lock; /* pointer to irq lock */
80 int flags; /* state flags */
81 char *buffer; /* pointer to output buffer */
82 char *inbuf; /* pointer to input buffer */
83 int head; /* first free byte in output buffer */
84 int count; /* number of bytes in output buffer */
85 int written; /* number of bytes in write requests */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 struct raw3215_req *queued_read; /* pointer to queued read requests */
87 struct raw3215_req *queued_write;/* pointer to queued write requests */
Martin Schwidefsky656d9122012-02-17 10:29:22 +010088 struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 wait_queue_head_t empty_wait; /* wait queue for flushing */
90 struct timer_list timer; /* timer for delayed output */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 int line_pos; /* position on the line (for tabs) */
92 char ubuffer[80]; /* copy_from_user buffer */
93};
94
95/* array of 3215 devices structures */
96static struct raw3215_info *raw3215[NR_3215];
97/* spinlock to protect the raw3215 array */
98static DEFINE_SPINLOCK(raw3215_device_lock);
99/* list of free request structures */
100static struct raw3215_req *raw3215_freelist;
101/* spinlock to protect free list */
102static spinlock_t raw3215_freelist_lock;
103
104static struct tty_driver *tty3215_driver;
105
106/*
107 * Get a request structure from the free list
108 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200109static inline struct raw3215_req *raw3215_alloc_req(void)
110{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 struct raw3215_req *req;
112 unsigned long flags;
113
114 spin_lock_irqsave(&raw3215_freelist_lock, flags);
115 req = raw3215_freelist;
116 raw3215_freelist = req->next;
117 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
118 return req;
119}
120
121/*
122 * Put a request structure back to the free list
123 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200124static inline void raw3215_free_req(struct raw3215_req *req)
125{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 unsigned long flags;
127
128 if (req->type == RAW3215_FREE)
129 return; /* don't free a free request */
130 req->type = RAW3215_FREE;
131 spin_lock_irqsave(&raw3215_freelist_lock, flags);
132 req->next = raw3215_freelist;
133 raw3215_freelist = req;
134 spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
135}
136
137/*
138 * Set up a read request that reads up to 160 byte from the 3215 device.
139 * If there is a queued read request it is used, but that shouldn't happen
140 * because a 3215 terminal won't accept a new read before the old one is
141 * completed.
142 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200143static void raw3215_mk_read_req(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
145 struct raw3215_req *req;
146 struct ccw1 *ccw;
147
148 /* there can only be ONE read request at a time */
149 req = raw->queued_read;
150 if (req == NULL) {
151 /* no queued read request, use new req structure */
152 req = raw3215_alloc_req();
153 req->type = RAW3215_READ;
154 req->info = raw;
155 raw->queued_read = req;
156 }
157
158 ccw = req->ccws;
159 ccw->cmd_code = 0x0A; /* read inquiry */
160 ccw->flags = 0x20; /* ignore incorrect length */
161 ccw->count = 160;
162 ccw->cda = (__u32) __pa(raw->inbuf);
163}
164
165/*
166 * Set up a write request with the information from the main structure.
167 * A ccw chain is created that writes as much as possible from the output
168 * buffer to the 3215 device. If a queued write exists it is replaced by
169 * the new, probably lengthened request.
170 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200171static void raw3215_mk_write_req(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
173 struct raw3215_req *req;
174 struct ccw1 *ccw;
175 int len, count, ix, lines;
176
177 if (raw->count <= raw->written)
178 return;
179 /* check if there is a queued write request */
180 req = raw->queued_write;
181 if (req == NULL) {
182 /* no queued write request, use new req structure */
183 req = raw3215_alloc_req();
184 req->type = RAW3215_WRITE;
185 req->info = raw;
186 raw->queued_write = req;
187 } else {
188 raw->written -= req->len;
189 }
190
191 ccw = req->ccws;
192 req->start = (raw->head - raw->count + raw->written) &
193 (RAW3215_BUFFER_SIZE - 1);
194 /*
195 * now we have to count newlines. We can at max accept
196 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
197 * a restriction in VM
198 */
199 lines = 0;
200 ix = req->start;
201 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
202 if (raw->buffer[ix] == 0x15)
203 lines++;
204 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
205 }
206 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
207 if (len > RAW3215_MAX_BYTES)
208 len = RAW3215_MAX_BYTES;
209 req->len = len;
210 raw->written += len;
211
212 /* set the indication if we should try to enlarge this request */
213 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
214
215 ix = req->start;
216 while (len > 0) {
217 if (ccw > req->ccws)
218 ccw[-1].flags |= 0x40; /* use command chaining */
219 ccw->cmd_code = 0x01; /* write, auto carrier return */
220 ccw->flags = 0x20; /* ignore incorrect length ind. */
221 ccw->cda =
222 (__u32) __pa(raw->buffer + ix);
223 count = len;
224 if (ix + count > RAW3215_BUFFER_SIZE)
225 count = RAW3215_BUFFER_SIZE - ix;
226 ccw->count = count;
227 len -= count;
228 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
229 ccw++;
230 }
231 /*
232 * Add a NOP to the channel program. 3215 devices are purely
233 * emulated and its much better to avoid the channel end
234 * interrupt in this case.
235 */
236 if (ccw > req->ccws)
237 ccw[-1].flags |= 0x40; /* use command chaining */
238 ccw->cmd_code = 0x03; /* NOP */
239 ccw->flags = 0;
240 ccw->cda = 0;
241 ccw->count = 1;
242}
243
244/*
245 * Start a read or a write request
246 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200247static void raw3215_start_io(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
249 struct raw3215_req *req;
250 int res;
251
252 req = raw->queued_read;
253 if (req != NULL &&
254 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
255 /* dequeue request */
256 raw->queued_read = NULL;
257 res = ccw_device_start(raw->cdev, req->ccws,
258 (unsigned long) req, 0, 0);
259 if (res != 0) {
260 /* do_IO failed, put request back to queue */
261 raw->queued_read = req;
262 } else {
263 raw->flags |= RAW3215_WORKING;
264 }
265 }
266 req = raw->queued_write;
267 if (req != NULL &&
268 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
269 /* dequeue request */
270 raw->queued_write = NULL;
271 res = ccw_device_start(raw->cdev, req->ccws,
272 (unsigned long) req, 0, 0);
273 if (res != 0) {
274 /* do_IO failed, put request back to queue */
275 raw->queued_write = req;
276 } else {
277 raw->flags |= RAW3215_WORKING;
278 }
279 }
280}
281
282/*
283 * Function to start a delayed output after RAW3215_TIMEOUT seconds
284 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200285static void raw3215_timeout(unsigned long __data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
287 struct raw3215_info *raw = (struct raw3215_info *) __data;
288 unsigned long flags;
289
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Martin Schwidefsky26d766c2014-07-15 17:53:12 +0200291 raw->flags &= ~RAW3215_TIMER_RUNS;
292 if (!(raw->port.flags & ASYNC_SUSPENDED)) {
293 raw3215_mk_write_req(raw);
294 raw3215_start_io(raw);
295 if ((raw->queued_read || raw->queued_write) &&
296 !(raw->flags & RAW3215_WORKING) &&
297 !(raw->flags & RAW3215_TIMER_RUNS)) {
298 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
299 add_timer(&raw->timer);
300 raw->flags |= RAW3215_TIMER_RUNS;
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200301 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100303 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
306/*
307 * Function to conditionally start an IO. A read is started immediately,
308 * a write is only started immediately if the flush flag is on or the
309 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
310 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
311 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200312static inline void raw3215_try_io(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200314 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
315 (raw->port.flags & ASYNC_SUSPENDED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return;
317 if (raw->queued_read != NULL)
318 raw3215_start_io(raw);
319 else if (raw->queued_write != NULL) {
320 if ((raw->queued_write->delayable == 0) ||
321 (raw->flags & RAW3215_FLUSHING)) {
322 /* execute write requests bigger than minimum size */
323 raw3215_start_io(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 }
325 }
Martin Schwidefsky26d766c2014-07-15 17:53:12 +0200326 if ((raw->queued_read || raw->queued_write) &&
327 !(raw->flags & RAW3215_WORKING) &&
328 !(raw->flags & RAW3215_TIMER_RUNS)) {
329 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
330 add_timer(&raw->timer);
331 raw->flags |= RAW3215_TIMER_RUNS;
332 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333}
334
335/*
Martin Schwidefsky656d9122012-02-17 10:29:22 +0100336 * Call tty_wakeup from tasklet context
337 */
338static void raw3215_wakeup(unsigned long data)
339{
340 struct raw3215_info *raw = (struct raw3215_info *) data;
Heiko Carstense695b282012-04-17 13:16:34 +0200341 struct tty_struct *tty;
342
343 tty = tty_port_tty_get(&raw->port);
Heiko Carstensae289dc2012-11-15 09:22:40 +0100344 if (tty) {
345 tty_wakeup(tty);
346 tty_kref_put(tty);
347 }
Martin Schwidefsky656d9122012-02-17 10:29:22 +0100348}
349
350/*
Heiko Carstens408aec32008-10-10 21:33:28 +0200351 * Try to start the next IO and wake up processes waiting on the tty.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 */
Jiri Slaby86b260072012-04-11 11:14:59 +0200353static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 raw3215_mk_write_req(raw);
356 raw3215_try_io(raw);
Jiri Slaby86b260072012-04-11 11:14:59 +0200357 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
Martin Schwidefsky656d9122012-02-17 10:29:22 +0100358 tasklet_schedule(&raw->tlet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360
361/*
362 * Interrupt routine, called from common io layer
363 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200364static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
365 struct irb *irb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
367 struct raw3215_info *raw;
368 struct raw3215_req *req;
369 struct tty_struct *tty;
370 int cstat, dstat;
Heiko Carstens1d030372008-07-14 09:59:44 +0200371 int count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700373 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 req = (struct raw3215_req *) intparm;
Jiri Slaby86b260072012-04-11 11:14:59 +0200375 tty = tty_port_tty_get(&raw->port);
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200376 cstat = irb->scsw.cmd.cstat;
377 dstat = irb->scsw.cmd.dstat;
Martin Schwidefsky26348f72008-07-14 09:59:26 +0200378 if (cstat != 0)
Jiri Slaby86b260072012-04-11 11:14:59 +0200379 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (dstat & 0x01) { /* we got a unit exception */
381 dstat &= ~0x01; /* we can ignore it */
382 }
383 switch (dstat) {
384 case 0x80:
385 if (cstat != 0)
386 break;
387 /* Attention interrupt, someone hit the enter key */
388 raw3215_mk_read_req(raw);
Jiri Slaby86b260072012-04-11 11:14:59 +0200389 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 break;
391 case 0x08:
392 case 0x0C:
393 /* Channel end interrupt. */
394 if ((raw = req->info) == NULL)
Jiri Slaby86b260072012-04-11 11:14:59 +0200395 goto put_tty; /* That shouldn't happen ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 if (req->type == RAW3215_READ) {
397 /* store residual count, then wait for device end */
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200398 req->residual = irb->scsw.cmd.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
400 if (dstat == 0x08)
401 break;
402 case 0x04:
403 /* Device end interrupt. */
404 if ((raw = req->info) == NULL)
Jiri Slaby86b260072012-04-11 11:14:59 +0200405 goto put_tty; /* That shouldn't happen ... */
406 if (req->type == RAW3215_READ && tty != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 unsigned int cchar;
408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 count = 160 - req->residual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 EBCASC(raw->inbuf, count);
411 cchar = ctrlchar_handle(raw->inbuf, count, tty);
412 switch (cchar & CTRLCHAR_MASK) {
413 case CTRLCHAR_SYSRQ:
414 break;
415
416 case CTRLCHAR_CTRL:
Jiri Slaby92a19f92013-01-03 15:53:03 +0100417 tty_insert_flip_char(&raw->port, cchar,
418 TTY_NORMAL);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100419 tty_flip_buffer_push(&raw->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 break;
421
422 case CTRLCHAR_NONE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (count < 2 ||
Alan Cox33f0f882006-01-09 20:54:13 -0800424 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
425 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
426 /* add the auto \n */
427 raw->inbuf[count] = '\n';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 count++;
429 } else
Alan Cox33f0f882006-01-09 20:54:13 -0800430 count -= 2;
Jiri Slaby05c7cd32013-01-03 15:53:04 +0100431 tty_insert_flip_string(&raw->port, raw->inbuf,
432 count);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100433 tty_flip_buffer_push(&raw->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 break;
435 }
436 } else if (req->type == RAW3215_WRITE) {
437 raw->count -= req->len;
438 raw->written -= req->len;
439 }
440 raw->flags &= ~RAW3215_WORKING;
441 raw3215_free_req(req);
442 /* check for empty wait */
443 if (waitqueue_active(&raw->empty_wait) &&
444 raw->queued_write == NULL &&
445 raw->queued_read == NULL) {
446 wake_up_interruptible(&raw->empty_wait);
447 }
Jiri Slaby86b260072012-04-11 11:14:59 +0200448 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 break;
450 default:
451 /* Strange interrupt, I'll do my best to clean up */
452 if (req != NULL && req->type != RAW3215_FREE) {
453 if (req->type == RAW3215_WRITE) {
454 raw->count -= req->len;
455 raw->written -= req->len;
456 }
457 raw->flags &= ~RAW3215_WORKING;
458 raw3215_free_req(req);
459 }
Jiri Slaby86b260072012-04-11 11:14:59 +0200460 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 }
Jiri Slaby86b260072012-04-11 11:14:59 +0200462put_tty:
463 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
466/*
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200467 * Drop the oldest line from the output buffer.
468 */
469static void raw3215_drop_line(struct raw3215_info *raw)
470{
471 int ix;
472 char ch;
473
474 BUG_ON(raw->written != 0);
475 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
476 while (raw->count > 0) {
477 ch = raw->buffer[ix];
478 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
479 raw->count--;
480 if (ch == 0x15)
481 break;
482 }
483 raw->head = ix;
484}
485
486/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 * Wait until length bytes are available int the output buffer.
488 * Has to be called with the s390irq lock held. Can be called
489 * disabled.
490 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200491static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492{
493 while (RAW3215_BUFFER_SIZE - raw->count < length) {
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200494 /* While console is frozen for suspend we have no other
495 * choice but to drop message from the buffer to make
496 * room for even more messages. */
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200497 if (raw->port.flags & ASYNC_SUSPENDED) {
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200498 raw3215_drop_line(raw);
499 continue;
500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 /* there might be a request pending */
502 raw->flags |= RAW3215_FLUSHING;
503 raw3215_mk_write_req(raw);
504 raw3215_try_io(raw);
505 raw->flags &= ~RAW3215_FLUSHING;
506#ifdef CONFIG_TN3215_CONSOLE
Sebastian Ott188561a2013-04-13 12:53:21 +0200507 ccw_device_wait_idle(raw->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508#endif
509 /* Enough room freed up ? */
510 if (RAW3215_BUFFER_SIZE - raw->count >= length)
511 break;
512 /* there might be another cpu waiting for the lock */
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100513 spin_unlock(get_ccwdev_lock(raw->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 udelay(100);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100515 spin_lock(get_ccwdev_lock(raw->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
517}
518
519/*
520 * String write routine for 3215 devices
521 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200522static void raw3215_write(struct raw3215_info *raw, const char *str,
523 unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
525 unsigned long flags;
526 int c, count;
527
528 while (length > 0) {
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100529 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 count = (length > RAW3215_BUFFER_SIZE) ?
531 RAW3215_BUFFER_SIZE : length;
532 length -= count;
533
534 raw3215_make_room(raw, count);
535
536 /* copy string to output buffer and convert it to EBCDIC */
537 while (1) {
538 c = min_t(int, count,
539 min(RAW3215_BUFFER_SIZE - raw->count,
540 RAW3215_BUFFER_SIZE - raw->head));
541 if (c <= 0)
542 break;
543 memcpy(raw->buffer + raw->head, str, c);
544 ASCEBC(raw->buffer + raw->head, c);
545 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
546 raw->count += c;
547 raw->line_pos += c;
548 str += c;
549 count -= c;
550 }
551 if (!(raw->flags & RAW3215_WORKING)) {
552 raw3215_mk_write_req(raw);
553 /* start or queue request */
554 raw3215_try_io(raw);
555 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100556 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
558}
559
560/*
561 * Put character routine for 3215 devices
562 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200563static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564{
565 unsigned long flags;
566 unsigned int length, i;
567
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100568 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (ch == '\t') {
570 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
571 raw->line_pos += length;
572 ch = ' ';
573 } else if (ch == '\n') {
574 length = 1;
575 raw->line_pos = 0;
576 } else {
577 length = 1;
578 raw->line_pos++;
579 }
580 raw3215_make_room(raw, length);
581
582 for (i = 0; i < length; i++) {
583 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
584 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
585 raw->count++;
586 }
587 if (!(raw->flags & RAW3215_WORKING)) {
588 raw3215_mk_write_req(raw);
589 /* start or queue request */
590 raw3215_try_io(raw);
591 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100592 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593}
594
595/*
596 * Flush routine, it simply sets the flush flag and tries to start
597 * pending IO.
598 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200599static void raw3215_flush_buffer(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
601 unsigned long flags;
602
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100603 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 if (raw->count > 0) {
605 raw->flags |= RAW3215_FLUSHING;
606 raw3215_try_io(raw);
607 raw->flags &= ~RAW3215_FLUSHING;
608 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100609 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
611
612/*
613 * Fire up a 3215 device.
614 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200615static int raw3215_startup(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
617 unsigned long flags;
618
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200619 if (raw->port.flags & ASYNC_INITIALIZED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 return 0;
621 raw->line_pos = 0;
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200622 raw->port.flags |= ASYNC_INITIALIZED;
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100623 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 raw3215_try_io(raw);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100625 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 return 0;
628}
629
630/*
631 * Shutdown a 3215 device.
632 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200633static void raw3215_shutdown(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634{
635 DECLARE_WAITQUEUE(wait, current);
636 unsigned long flags;
637
Heiko Carstens6673cd02013-01-03 14:31:53 +0100638 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
639 (raw->flags & RAW3215_FIXED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 return;
641 /* Wait for outstanding requests, then free irq */
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100642 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 if ((raw->flags & RAW3215_WORKING) ||
644 raw->queued_write != NULL ||
645 raw->queued_read != NULL) {
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200646 raw->port.flags |= ASYNC_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 add_wait_queue(&raw->empty_wait, &wait);
648 set_current_state(TASK_INTERRUPTIBLE);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100649 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 schedule();
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100651 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 remove_wait_queue(&raw->empty_wait, &wait);
653 set_current_state(TASK_RUNNING);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200654 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100656 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657}
658
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200659static struct raw3215_info *raw3215_alloc_info(void)
660{
661 struct raw3215_info *info;
662
663 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
664 if (!info)
665 return NULL;
666
667 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
668 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
669 if (!info->buffer || !info->inbuf) {
670 kfree(info);
671 return NULL;
672 }
673
674 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
675 init_waitqueue_head(&info->empty_wait);
676 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200677 tty_port_init(&info->port);
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200678
679 return info;
680}
681
682static void raw3215_free_info(struct raw3215_info *raw)
683{
684 kfree(raw->inbuf);
685 kfree(raw->buffer);
Jiri Slaby191c5f12012-11-15 09:49:56 +0100686 tty_port_destroy(&raw->port);
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200687 kfree(raw);
688}
689
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200690static int raw3215_probe (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691{
692 struct raw3215_info *raw;
693 int line;
694
Cornelia Hucka2e53802007-10-12 16:11:52 +0200695 /* Console is special. */
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700696 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
Cornelia Hucka2e53802007-10-12 16:11:52 +0200697 return 0;
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200698
699 raw = raw3215_alloc_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (raw == NULL)
701 return -ENOMEM;
702
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200703 raw->cdev = cdev;
704 dev_set_drvdata(&cdev->dev, raw);
705 cdev->handler = raw3215_irq;
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 spin_lock(&raw3215_device_lock);
708 for (line = 0; line < NR_3215; line++) {
709 if (!raw3215[line]) {
710 raw3215[line] = raw;
711 break;
712 }
713 }
714 spin_unlock(&raw3215_device_lock);
715 if (line == NR_3215) {
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200716 raw3215_free_info(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 return -ENODEV;
718 }
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 return 0;
721}
722
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200723static void raw3215_remove (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
725 struct raw3215_info *raw;
Jiri Slaby3ec0a172012-08-07 21:47:57 +0200726 unsigned int line;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 ccw_device_set_offline(cdev);
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700729 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 if (raw) {
Jiri Slaby3ec0a172012-08-07 21:47:57 +0200731 spin_lock(&raw3215_device_lock);
732 for (line = 0; line < NR_3215; line++)
733 if (raw3215[line] == raw)
734 break;
735 raw3215[line] = NULL;
736 spin_unlock(&raw3215_device_lock);
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700737 dev_set_drvdata(&cdev->dev, NULL);
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200738 raw3215_free_info(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 }
740}
741
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200742static int raw3215_set_online (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
744 struct raw3215_info *raw;
745
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700746 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (!raw)
748 return -ENODEV;
749
750 return raw3215_startup(raw);
751}
752
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200753static int raw3215_set_offline (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754{
755 struct raw3215_info *raw;
756
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700757 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 if (!raw)
759 return -ENODEV;
760
761 raw3215_shutdown(raw);
762
763 return 0;
764}
765
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200766static int raw3215_pm_stop(struct ccw_device *cdev)
767{
768 struct raw3215_info *raw;
769 unsigned long flags;
770
771 /* Empty the output buffer, then prevent new I/O. */
Martin Schwidefsky4f0076f2009-06-22 12:08:19 +0200772 raw = dev_get_drvdata(&cdev->dev);
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200773 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
774 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200775 raw->port.flags |= ASYNC_SUSPENDED;
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200776 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
777 return 0;
778}
779
780static int raw3215_pm_start(struct ccw_device *cdev)
781{
782 struct raw3215_info *raw;
783 unsigned long flags;
784
785 /* Allow I/O again and flush output buffer. */
Martin Schwidefsky4f0076f2009-06-22 12:08:19 +0200786 raw = dev_get_drvdata(&cdev->dev);
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200787 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200788 raw->port.flags &= ~ASYNC_SUSPENDED;
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200789 raw->flags |= RAW3215_FLUSHING;
790 raw3215_try_io(raw);
791 raw->flags &= ~RAW3215_FLUSHING;
792 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
793 return 0;
794}
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796static struct ccw_device_id raw3215_id[] = {
797 { CCW_DEVICE(0x3215, 0) },
798 { /* end of list */ },
799};
800
801static struct ccw_driver raw3215_ccw_driver = {
Sebastian Ott3bda0582011-03-23 10:16:02 +0100802 .driver = {
803 .name = "3215",
804 .owner = THIS_MODULE,
805 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 .ids = raw3215_id,
807 .probe = &raw3215_probe,
808 .remove = &raw3215_remove,
809 .set_online = &raw3215_set_online,
810 .set_offline = &raw3215_set_offline,
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200811 .freeze = &raw3215_pm_stop,
812 .thaw = &raw3215_pm_start,
813 .restore = &raw3215_pm_start,
Heiko Carstens420f42e2013-01-02 15:18:18 +0100814 .int_class = IRQIO_C15,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815};
816
817#ifdef CONFIG_TN3215_CONSOLE
818/*
819 * Write a string to the 3215 console
820 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200821static void con3215_write(struct console *co, const char *str,
822 unsigned int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823{
824 struct raw3215_info *raw;
825 int i;
826
827 if (count <= 0)
828 return;
829 raw = raw3215[0]; /* console 3215 is the first one */
830 while (count > 0) {
831 for (i = 0; i < count; i++)
832 if (str[i] == '\t' || str[i] == '\n')
833 break;
834 raw3215_write(raw, str, i);
835 count -= i;
836 str += i;
837 if (count > 0) {
838 raw3215_putchar(raw, *str);
839 count--;
840 str++;
841 }
842 }
843}
844
845static struct tty_driver *con3215_device(struct console *c, int *index)
846{
847 *index = c->index;
848 return tty3215_driver;
849}
850
851/*
Holger Smolinski2332ce12008-10-10 21:33:27 +0200852 * panic() calls con3215_flush through a panic_notifier
853 * before the system enters a disabled, endless loop.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200855static void con3215_flush(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
857 struct raw3215_info *raw;
858 unsigned long flags;
859
860 raw = raw3215[0]; /* console 3215 is the first one */
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200861 if (raw->port.flags & ASYNC_SUSPENDED)
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200862 /* The console is still frozen for suspend. */
Sebastian Ottf10ccca2013-04-13 12:56:51 +0200863 if (ccw_device_force_console(raw->cdev))
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200864 /* Forcing didn't work, no panic message .. */
865 return;
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100866 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100868 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869}
870
Holger Smolinski2332ce12008-10-10 21:33:27 +0200871static int con3215_notify(struct notifier_block *self,
872 unsigned long event, void *data)
873{
874 con3215_flush();
875 return NOTIFY_OK;
876}
877
878static struct notifier_block on_panic_nb = {
879 .notifier_call = con3215_notify,
880 .priority = 0,
881};
882
883static struct notifier_block on_reboot_nb = {
884 .notifier_call = con3215_notify,
885 .priority = 0,
886};
887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888/*
889 * The console structure for the 3215 console
890 */
891static struct console con3215 = {
892 .name = "ttyS",
893 .write = con3215_write,
894 .device = con3215_device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 .flags = CON_PRINTBUFFER,
896};
897
898/*
899 * 3215 console initialization code called from console_init().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200901static int __init con3215_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902{
903 struct ccw_device *cdev;
904 struct raw3215_info *raw;
905 struct raw3215_req *req;
906 int i;
907
908 /* Check if 3215 is to be the console */
909 if (!CONSOLE_IS_3215)
910 return -ENODEV;
911
912 /* Set the console mode for VM */
913 if (MACHINE_IS_VM) {
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700914 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
915 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 }
917
918 /* allocate 3215 request structures */
919 raw3215_freelist = NULL;
920 spin_lock_init(&raw3215_freelist_lock);
921 for (i = 0; i < NR_3215_REQ; i++) {
Heiko Carstens6d56eee2009-06-22 12:08:04 +0200922 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 req->next = raw3215_freelist;
924 raw3215_freelist = req;
925 }
926
Sebastian Ott1e532092014-01-27 13:28:10 +0100927 cdev = ccw_device_create_console(&raw3215_ccw_driver);
Peter Oberparleiter600b5d12006-02-01 03:06:35 -0800928 if (IS_ERR(cdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 return -ENODEV;
930
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200931 raw3215[0] = raw = raw3215_alloc_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 raw->cdev = cdev;
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700933 dev_set_drvdata(&cdev->dev, raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 cdev->handler = raw3215_irq;
935
Heiko Carstens6673cd02013-01-03 14:31:53 +0100936 raw->flags |= RAW3215_FIXED;
Sebastian Ott1e532092014-01-27 13:28:10 +0100937 if (ccw_device_enable_console(cdev)) {
938 ccw_device_destroy_console(cdev);
939 raw3215_free_info(raw);
940 raw3215[0] = NULL;
941 return -ENODEV;
942 }
Heiko Carstens6673cd02013-01-03 14:31:53 +0100943
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 /* Request the console irq */
945 if (raw3215_startup(raw) != 0) {
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200946 raw3215_free_info(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 raw3215[0] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 return -ENODEV;
949 }
Holger Smolinski2332ce12008-10-10 21:33:27 +0200950 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
951 register_reboot_notifier(&on_reboot_nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 register_console(&con3215);
953 return 0;
954}
955console_initcall(con3215_init);
956#endif
957
Jiri Slabyd2281102012-08-07 21:47:58 +0200958static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
959{
960 struct raw3215_info *raw;
961
962 raw = raw3215[tty->index];
963 if (raw == NULL)
964 return -ENODEV;
965
966 tty->driver_data = raw;
967
968 return tty_port_install(&raw->port, driver, tty);
969}
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971/*
972 * tty3215_open
973 *
974 * This routine is called whenever a 3215 tty is opened.
975 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200976static int tty3215_open(struct tty_struct *tty, struct file * filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977{
Jiri Slabyd2281102012-08-07 21:47:58 +0200978 struct raw3215_info *raw = tty->driver_data;
Jiri Slaby410235f2012-03-05 14:52:01 +0100979 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Jiri Slaby86b260072012-04-11 11:14:59 +0200981 tty_port_tty_set(&raw->port, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
Jiri Slabyd6c53c02013-01-03 15:53:05 +0100983 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 /*
985 * Start up 3215 device
986 */
987 retval = raw3215_startup(raw);
988 if (retval)
989 return retval;
990
991 return 0;
992}
993
994/*
995 * tty3215_close()
996 *
997 * This routine is called when the 3215 tty is closed. We wait
998 * for the remaining request to be completed. Then we clean up.
999 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001000static void tty3215_close(struct tty_struct *tty, struct file * filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
1002 struct raw3215_info *raw;
1003
1004 raw = (struct raw3215_info *) tty->driver_data;
1005 if (raw == NULL || tty->count > 1)
1006 return;
1007 tty->closing = 1;
1008 /* Shutdown the terminal */
1009 raw3215_shutdown(raw);
Martin Schwidefsky656d9122012-02-17 10:29:22 +01001010 tasklet_kill(&raw->tlet);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 tty->closing = 0;
Jiri Slaby86b260072012-04-11 11:14:59 +02001012 tty_port_tty_set(&raw->port, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014
1015/*
1016 * Returns the amount of free space in the output buffer.
1017 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001018static int tty3215_write_room(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019{
1020 struct raw3215_info *raw;
1021
1022 raw = (struct raw3215_info *) tty->driver_data;
1023
1024 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1025 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1026 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1027 else
1028 return 0;
1029}
1030
1031/*
1032 * String write routine for 3215 ttys
1033 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001034static int tty3215_write(struct tty_struct * tty,
1035 const unsigned char *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036{
1037 struct raw3215_info *raw;
Martin Schwidefskye512d562014-08-13 12:01:30 +02001038 int i, written;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
1040 if (!tty)
1041 return 0;
1042 raw = (struct raw3215_info *) tty->driver_data;
Martin Schwidefskye512d562014-08-13 12:01:30 +02001043 written = count;
1044 while (count > 0) {
1045 for (i = 0; i < count; i++)
1046 if (buf[i] == '\t' || buf[i] == '\n')
1047 break;
1048 raw3215_write(raw, buf, i);
1049 count -= i;
1050 buf += i;
1051 if (count > 0) {
1052 raw3215_putchar(raw, *buf);
1053 count--;
1054 buf++;
1055 }
1056 }
1057 return written;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
1059
1060/*
1061 * Put character routine for 3215 ttys
1062 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001063static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064{
1065 struct raw3215_info *raw;
1066
1067 if (!tty)
Alan Cox9e7c9a12008-04-30 00:54:00 -07001068 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 raw = (struct raw3215_info *) tty->driver_data;
1070 raw3215_putchar(raw, ch);
Alan Cox9e7c9a12008-04-30 00:54:00 -07001071 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072}
1073
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001074static void tty3215_flush_chars(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075{
1076}
1077
1078/*
1079 * Returns the number of characters in the output buffer
1080 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001081static int tty3215_chars_in_buffer(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082{
1083 struct raw3215_info *raw;
1084
1085 raw = (struct raw3215_info *) tty->driver_data;
1086 return raw->count;
1087}
1088
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001089static void tty3215_flush_buffer(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090{
1091 struct raw3215_info *raw;
1092
1093 raw = (struct raw3215_info *) tty->driver_data;
1094 raw3215_flush_buffer(raw);
1095 tty_wakeup(tty);
1096}
1097
1098/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 * Disable reading from a 3215 tty
1100 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001101static void tty3215_throttle(struct tty_struct * tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102{
1103 struct raw3215_info *raw;
1104
1105 raw = (struct raw3215_info *) tty->driver_data;
1106 raw->flags |= RAW3215_THROTTLED;
1107}
1108
1109/*
1110 * Enable reading from a 3215 tty
1111 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001112static void tty3215_unthrottle(struct tty_struct * tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113{
1114 struct raw3215_info *raw;
1115 unsigned long flags;
1116
1117 raw = (struct raw3215_info *) tty->driver_data;
1118 if (raw->flags & RAW3215_THROTTLED) {
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001119 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 raw->flags &= ~RAW3215_THROTTLED;
1121 raw3215_try_io(raw);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001122 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 }
1124}
1125
1126/*
1127 * Disable writing to a 3215 tty
1128 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001129static void tty3215_stop(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130{
1131 struct raw3215_info *raw;
1132
1133 raw = (struct raw3215_info *) tty->driver_data;
1134 raw->flags |= RAW3215_STOPPED;
1135}
1136
1137/*
1138 * Enable writing to a 3215 tty
1139 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001140static void tty3215_start(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
1142 struct raw3215_info *raw;
1143 unsigned long flags;
1144
1145 raw = (struct raw3215_info *) tty->driver_data;
1146 if (raw->flags & RAW3215_STOPPED) {
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001147 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 raw->flags &= ~RAW3215_STOPPED;
1149 raw3215_try_io(raw);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001150 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 }
1152}
1153
Jeff Dikeb68e31d2006-10-02 02:17:18 -07001154static const struct tty_operations tty3215_ops = {
Jiri Slabyd2281102012-08-07 21:47:58 +02001155 .install = tty3215_install,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 .open = tty3215_open,
1157 .close = tty3215_close,
1158 .write = tty3215_write,
1159 .put_char = tty3215_put_char,
1160 .flush_chars = tty3215_flush_chars,
1161 .write_room = tty3215_write_room,
1162 .chars_in_buffer = tty3215_chars_in_buffer,
1163 .flush_buffer = tty3215_flush_buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 .throttle = tty3215_throttle,
1165 .unthrottle = tty3215_unthrottle,
1166 .stop = tty3215_stop,
1167 .start = tty3215_start,
1168};
1169
1170/*
1171 * 3215 tty registration code called from tty_init().
1172 * Most kernel services (incl. kmalloc) are available at this poimt.
1173 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001174static int __init tty3215_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175{
1176 struct tty_driver *driver;
1177 int ret;
1178
1179 if (!CONSOLE_IS_3215)
1180 return 0;
1181
1182 driver = alloc_tty_driver(NR_3215);
1183 if (!driver)
1184 return -ENOMEM;
1185
1186 ret = ccw_driver_register(&raw3215_ccw_driver);
1187 if (ret) {
1188 put_tty_driver(driver);
1189 return ret;
1190 }
1191 /*
1192 * Initialize the tty_driver structure
1193 * Entries in tty3215_driver that are NOT initialized:
1194 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1195 */
1196
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 driver->driver_name = "tty3215";
1198 driver->name = "ttyS";
1199 driver->major = TTY_MAJOR;
1200 driver->minor_start = 64;
1201 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1202 driver->subtype = SYSTEM_TYPE_TTY;
1203 driver->init_termios = tty_std_termios;
1204 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
Martin Schwidefskye512d562014-08-13 12:01:30 +02001205 driver->init_termios.c_oflag = ONLCR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 driver->init_termios.c_lflag = ISIG;
1207 driver->flags = TTY_DRIVER_REAL_RAW;
1208 tty_set_operations(driver, &tty3215_ops);
1209 ret = tty_register_driver(driver);
1210 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 put_tty_driver(driver);
1212 return ret;
1213 }
1214 tty3215_driver = driver;
1215 return 0;
1216}
1217
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001218static void __exit tty3215_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219{
1220 tty_unregister_driver(tty3215_driver);
1221 put_tty_driver(tty3215_driver);
1222 ccw_driver_unregister(&raw3215_ccw_driver);
1223}
1224
1225module_init(tty3215_init);
1226module_exit(tty3215_exit);