blob: 5af7f0bd6125702358cb1fbab5830c5a77506e7b [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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 if (raw->flags & RAW3215_TIMER_RUNS) {
292 del_timer(&raw->timer);
293 raw->flags &= ~RAW3215_TIMER_RUNS;
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200294 if (!(raw->port.flags & ASYNC_SUSPENDED)) {
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200295 raw3215_mk_write_req(raw);
296 raw3215_start_io(raw);
297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100299 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
302/*
303 * Function to conditionally start an IO. A read is started immediately,
304 * a write is only started immediately if the flush flag is on or the
305 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
306 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
307 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200308static inline void raw3215_try_io(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200310 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
311 (raw->port.flags & ASYNC_SUSPENDED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 return;
313 if (raw->queued_read != NULL)
314 raw3215_start_io(raw);
315 else if (raw->queued_write != NULL) {
316 if ((raw->queued_write->delayable == 0) ||
317 (raw->flags & RAW3215_FLUSHING)) {
318 /* execute write requests bigger than minimum size */
319 raw3215_start_io(raw);
320 if (raw->flags & RAW3215_TIMER_RUNS) {
321 del_timer(&raw->timer);
322 raw->flags &= ~RAW3215_TIMER_RUNS;
323 }
324 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
325 /* delay small writes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 add_timer(&raw->timer);
328 raw->flags |= RAW3215_TIMER_RUNS;
329 }
330 }
331}
332
333/*
Martin Schwidefsky656d9122012-02-17 10:29:22 +0100334 * Call tty_wakeup from tasklet context
335 */
336static void raw3215_wakeup(unsigned long data)
337{
338 struct raw3215_info *raw = (struct raw3215_info *) data;
Heiko Carstense695b282012-04-17 13:16:34 +0200339 struct tty_struct *tty;
340
341 tty = tty_port_tty_get(&raw->port);
Heiko Carstensae289dc2012-11-15 09:22:40 +0100342 if (tty) {
343 tty_wakeup(tty);
344 tty_kref_put(tty);
345 }
Martin Schwidefsky656d9122012-02-17 10:29:22 +0100346}
347
348/*
Heiko Carstens408aec32008-10-10 21:33:28 +0200349 * Try to start the next IO and wake up processes waiting on the tty.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 */
Jiri Slaby86b260072012-04-11 11:14:59 +0200351static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 raw3215_mk_write_req(raw);
354 raw3215_try_io(raw);
Jiri Slaby86b260072012-04-11 11:14:59 +0200355 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
Martin Schwidefsky656d9122012-02-17 10:29:22 +0100356 tasklet_schedule(&raw->tlet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359/*
360 * Interrupt routine, called from common io layer
361 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200362static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
363 struct irb *irb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365 struct raw3215_info *raw;
366 struct raw3215_req *req;
367 struct tty_struct *tty;
368 int cstat, dstat;
Heiko Carstens1d030372008-07-14 09:59:44 +0200369 int count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700371 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 req = (struct raw3215_req *) intparm;
Jiri Slaby86b260072012-04-11 11:14:59 +0200373 tty = tty_port_tty_get(&raw->port);
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200374 cstat = irb->scsw.cmd.cstat;
375 dstat = irb->scsw.cmd.dstat;
Martin Schwidefsky26348f72008-07-14 09:59:26 +0200376 if (cstat != 0)
Jiri Slaby86b260072012-04-11 11:14:59 +0200377 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 if (dstat & 0x01) { /* we got a unit exception */
379 dstat &= ~0x01; /* we can ignore it */
380 }
381 switch (dstat) {
382 case 0x80:
383 if (cstat != 0)
384 break;
385 /* Attention interrupt, someone hit the enter key */
386 raw3215_mk_read_req(raw);
Jiri Slaby86b260072012-04-11 11:14:59 +0200387 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 break;
389 case 0x08:
390 case 0x0C:
391 /* Channel end interrupt. */
392 if ((raw = req->info) == NULL)
Jiri Slaby86b260072012-04-11 11:14:59 +0200393 goto put_tty; /* That shouldn't happen ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (req->type == RAW3215_READ) {
395 /* store residual count, then wait for device end */
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200396 req->residual = irb->scsw.cmd.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
398 if (dstat == 0x08)
399 break;
400 case 0x04:
401 /* Device end interrupt. */
402 if ((raw = req->info) == NULL)
Jiri Slaby86b260072012-04-11 11:14:59 +0200403 goto put_tty; /* That shouldn't happen ... */
404 if (req->type == RAW3215_READ && tty != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 unsigned int cchar;
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 count = 160 - req->residual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 EBCASC(raw->inbuf, count);
409 cchar = ctrlchar_handle(raw->inbuf, count, tty);
410 switch (cchar & CTRLCHAR_MASK) {
411 case CTRLCHAR_SYSRQ:
412 break;
413
414 case CTRLCHAR_CTRL:
Jiri Slaby92a19f92013-01-03 15:53:03 +0100415 tty_insert_flip_char(&raw->port, cchar,
416 TTY_NORMAL);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100417 tty_flip_buffer_push(&raw->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 break;
419
420 case CTRLCHAR_NONE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 if (count < 2 ||
Alan Cox33f0f882006-01-09 20:54:13 -0800422 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
423 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
424 /* add the auto \n */
425 raw->inbuf[count] = '\n';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 count++;
427 } else
Alan Cox33f0f882006-01-09 20:54:13 -0800428 count -= 2;
Jiri Slaby05c7cd32013-01-03 15:53:04 +0100429 tty_insert_flip_string(&raw->port, raw->inbuf,
430 count);
Jiri Slaby2e124b42013-01-03 15:53:06 +0100431 tty_flip_buffer_push(&raw->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 break;
433 }
434 } else if (req->type == RAW3215_WRITE) {
435 raw->count -= req->len;
436 raw->written -= req->len;
437 }
438 raw->flags &= ~RAW3215_WORKING;
439 raw3215_free_req(req);
440 /* check for empty wait */
441 if (waitqueue_active(&raw->empty_wait) &&
442 raw->queued_write == NULL &&
443 raw->queued_read == NULL) {
444 wake_up_interruptible(&raw->empty_wait);
445 }
Jiri Slaby86b260072012-04-11 11:14:59 +0200446 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 break;
448 default:
449 /* Strange interrupt, I'll do my best to clean up */
450 if (req != NULL && req->type != RAW3215_FREE) {
451 if (req->type == RAW3215_WRITE) {
452 raw->count -= req->len;
453 raw->written -= req->len;
454 }
455 raw->flags &= ~RAW3215_WORKING;
456 raw3215_free_req(req);
457 }
Jiri Slaby86b260072012-04-11 11:14:59 +0200458 raw3215_next_io(raw, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
Jiri Slaby86b260072012-04-11 11:14:59 +0200460put_tty:
461 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462}
463
464/*
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200465 * Drop the oldest line from the output buffer.
466 */
467static void raw3215_drop_line(struct raw3215_info *raw)
468{
469 int ix;
470 char ch;
471
472 BUG_ON(raw->written != 0);
473 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
474 while (raw->count > 0) {
475 ch = raw->buffer[ix];
476 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
477 raw->count--;
478 if (ch == 0x15)
479 break;
480 }
481 raw->head = ix;
482}
483
484/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 * Wait until length bytes are available int the output buffer.
486 * Has to be called with the s390irq lock held. Can be called
487 * disabled.
488 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200489static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 while (RAW3215_BUFFER_SIZE - raw->count < length) {
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200492 /* While console is frozen for suspend we have no other
493 * choice but to drop message from the buffer to make
494 * room for even more messages. */
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200495 if (raw->port.flags & ASYNC_SUSPENDED) {
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200496 raw3215_drop_line(raw);
497 continue;
498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 /* there might be a request pending */
500 raw->flags |= RAW3215_FLUSHING;
501 raw3215_mk_write_req(raw);
502 raw3215_try_io(raw);
503 raw->flags &= ~RAW3215_FLUSHING;
504#ifdef CONFIG_TN3215_CONSOLE
Sebastian Ott188561a2013-04-13 12:53:21 +0200505 ccw_device_wait_idle(raw->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506#endif
507 /* Enough room freed up ? */
508 if (RAW3215_BUFFER_SIZE - raw->count >= length)
509 break;
510 /* there might be another cpu waiting for the lock */
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100511 spin_unlock(get_ccwdev_lock(raw->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 udelay(100);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100513 spin_lock(get_ccwdev_lock(raw->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 }
515}
516
517/*
518 * String write routine for 3215 devices
519 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200520static void raw3215_write(struct raw3215_info *raw, const char *str,
521 unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
523 unsigned long flags;
524 int c, count;
525
526 while (length > 0) {
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100527 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 count = (length > RAW3215_BUFFER_SIZE) ?
529 RAW3215_BUFFER_SIZE : length;
530 length -= count;
531
532 raw3215_make_room(raw, count);
533
534 /* copy string to output buffer and convert it to EBCDIC */
535 while (1) {
536 c = min_t(int, count,
537 min(RAW3215_BUFFER_SIZE - raw->count,
538 RAW3215_BUFFER_SIZE - raw->head));
539 if (c <= 0)
540 break;
541 memcpy(raw->buffer + raw->head, str, c);
542 ASCEBC(raw->buffer + raw->head, c);
543 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
544 raw->count += c;
545 raw->line_pos += c;
546 str += c;
547 count -= c;
548 }
549 if (!(raw->flags & RAW3215_WORKING)) {
550 raw3215_mk_write_req(raw);
551 /* start or queue request */
552 raw3215_try_io(raw);
553 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100554 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 }
556}
557
558/*
559 * Put character routine for 3215 devices
560 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200561static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562{
563 unsigned long flags;
564 unsigned int length, i;
565
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100566 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 if (ch == '\t') {
568 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
569 raw->line_pos += length;
570 ch = ' ';
571 } else if (ch == '\n') {
572 length = 1;
573 raw->line_pos = 0;
574 } else {
575 length = 1;
576 raw->line_pos++;
577 }
578 raw3215_make_room(raw, length);
579
580 for (i = 0; i < length; i++) {
581 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
582 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
583 raw->count++;
584 }
585 if (!(raw->flags & RAW3215_WORKING)) {
586 raw3215_mk_write_req(raw);
587 /* start or queue request */
588 raw3215_try_io(raw);
589 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100590 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
593/*
594 * Flush routine, it simply sets the flush flag and tries to start
595 * pending IO.
596 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200597static void raw3215_flush_buffer(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598{
599 unsigned long flags;
600
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100601 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 if (raw->count > 0) {
603 raw->flags |= RAW3215_FLUSHING;
604 raw3215_try_io(raw);
605 raw->flags &= ~RAW3215_FLUSHING;
606 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100607 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
610/*
611 * Fire up a 3215 device.
612 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200613static int raw3215_startup(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614{
615 unsigned long flags;
616
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200617 if (raw->port.flags & ASYNC_INITIALIZED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return 0;
619 raw->line_pos = 0;
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200620 raw->port.flags |= ASYNC_INITIALIZED;
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100621 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 raw3215_try_io(raw);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100623 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625 return 0;
626}
627
628/*
629 * Shutdown a 3215 device.
630 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200631static void raw3215_shutdown(struct raw3215_info *raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
633 DECLARE_WAITQUEUE(wait, current);
634 unsigned long flags;
635
Heiko Carstens6673cd02013-01-03 14:31:53 +0100636 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
637 (raw->flags & RAW3215_FIXED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return;
639 /* Wait for outstanding requests, then free irq */
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100640 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 if ((raw->flags & RAW3215_WORKING) ||
642 raw->queued_write != NULL ||
643 raw->queued_read != NULL) {
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200644 raw->port.flags |= ASYNC_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 add_wait_queue(&raw->empty_wait, &wait);
646 set_current_state(TASK_INTERRUPTIBLE);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100647 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 schedule();
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100649 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 remove_wait_queue(&raw->empty_wait, &wait);
651 set_current_state(TASK_RUNNING);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200652 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100654 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
656
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200657static struct raw3215_info *raw3215_alloc_info(void)
658{
659 struct raw3215_info *info;
660
661 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
662 if (!info)
663 return NULL;
664
665 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
666 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
667 if (!info->buffer || !info->inbuf) {
668 kfree(info);
669 return NULL;
670 }
671
672 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
673 init_waitqueue_head(&info->empty_wait);
674 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200675 tty_port_init(&info->port);
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200676
677 return info;
678}
679
680static void raw3215_free_info(struct raw3215_info *raw)
681{
682 kfree(raw->inbuf);
683 kfree(raw->buffer);
Jiri Slaby191c5f12012-11-15 09:49:56 +0100684 tty_port_destroy(&raw->port);
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200685 kfree(raw);
686}
687
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200688static int raw3215_probe (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
690 struct raw3215_info *raw;
691 int line;
692
Cornelia Hucka2e53802007-10-12 16:11:52 +0200693 /* Console is special. */
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700694 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
Cornelia Hucka2e53802007-10-12 16:11:52 +0200695 return 0;
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200696
697 raw = raw3215_alloc_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 if (raw == NULL)
699 return -ENOMEM;
700
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200701 raw->cdev = cdev;
702 dev_set_drvdata(&cdev->dev, raw);
703 cdev->handler = raw3215_irq;
704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 spin_lock(&raw3215_device_lock);
706 for (line = 0; line < NR_3215; line++) {
707 if (!raw3215[line]) {
708 raw3215[line] = raw;
709 break;
710 }
711 }
712 spin_unlock(&raw3215_device_lock);
713 if (line == NR_3215) {
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200714 raw3215_free_info(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 return -ENODEV;
716 }
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 return 0;
719}
720
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200721static void raw3215_remove (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722{
723 struct raw3215_info *raw;
Jiri Slaby3ec0a172012-08-07 21:47:57 +0200724 unsigned int line;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 ccw_device_set_offline(cdev);
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700727 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 if (raw) {
Jiri Slaby3ec0a172012-08-07 21:47:57 +0200729 spin_lock(&raw3215_device_lock);
730 for (line = 0; line < NR_3215; line++)
731 if (raw3215[line] == raw)
732 break;
733 raw3215[line] = NULL;
734 spin_unlock(&raw3215_device_lock);
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700735 dev_set_drvdata(&cdev->dev, NULL);
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200736 raw3215_free_info(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 }
738}
739
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200740static int raw3215_set_online (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741{
742 struct raw3215_info *raw;
743
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700744 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 if (!raw)
746 return -ENODEV;
747
748 return raw3215_startup(raw);
749}
750
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200751static int raw3215_set_offline (struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
753 struct raw3215_info *raw;
754
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700755 raw = dev_get_drvdata(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 if (!raw)
757 return -ENODEV;
758
759 raw3215_shutdown(raw);
760
761 return 0;
762}
763
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200764static int raw3215_pm_stop(struct ccw_device *cdev)
765{
766 struct raw3215_info *raw;
767 unsigned long flags;
768
769 /* Empty the output buffer, then prevent new I/O. */
Martin Schwidefsky4f0076f2009-06-22 12:08:19 +0200770 raw = dev_get_drvdata(&cdev->dev);
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200771 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
772 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200773 raw->port.flags |= ASYNC_SUSPENDED;
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200774 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
775 return 0;
776}
777
778static int raw3215_pm_start(struct ccw_device *cdev)
779{
780 struct raw3215_info *raw;
781 unsigned long flags;
782
783 /* Allow I/O again and flush output buffer. */
Martin Schwidefsky4f0076f2009-06-22 12:08:19 +0200784 raw = dev_get_drvdata(&cdev->dev);
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200785 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200786 raw->port.flags &= ~ASYNC_SUSPENDED;
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200787 raw->flags |= RAW3215_FLUSHING;
788 raw3215_try_io(raw);
789 raw->flags &= ~RAW3215_FLUSHING;
790 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
791 return 0;
792}
793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794static struct ccw_device_id raw3215_id[] = {
795 { CCW_DEVICE(0x3215, 0) },
796 { /* end of list */ },
797};
798
799static struct ccw_driver raw3215_ccw_driver = {
Sebastian Ott3bda0582011-03-23 10:16:02 +0100800 .driver = {
801 .name = "3215",
802 .owner = THIS_MODULE,
803 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 .ids = raw3215_id,
805 .probe = &raw3215_probe,
806 .remove = &raw3215_remove,
807 .set_online = &raw3215_set_online,
808 .set_offline = &raw3215_set_offline,
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200809 .freeze = &raw3215_pm_stop,
810 .thaw = &raw3215_pm_start,
811 .restore = &raw3215_pm_start,
Heiko Carstens420f42e2013-01-02 15:18:18 +0100812 .int_class = IRQIO_C15,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813};
814
815#ifdef CONFIG_TN3215_CONSOLE
816/*
817 * Write a string to the 3215 console
818 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200819static void con3215_write(struct console *co, const char *str,
820 unsigned int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821{
822 struct raw3215_info *raw;
823 int i;
824
825 if (count <= 0)
826 return;
827 raw = raw3215[0]; /* console 3215 is the first one */
828 while (count > 0) {
829 for (i = 0; i < count; i++)
830 if (str[i] == '\t' || str[i] == '\n')
831 break;
832 raw3215_write(raw, str, i);
833 count -= i;
834 str += i;
835 if (count > 0) {
836 raw3215_putchar(raw, *str);
837 count--;
838 str++;
839 }
840 }
841}
842
843static struct tty_driver *con3215_device(struct console *c, int *index)
844{
845 *index = c->index;
846 return tty3215_driver;
847}
848
849/*
Holger Smolinski2332ce12008-10-10 21:33:27 +0200850 * panic() calls con3215_flush through a panic_notifier
851 * before the system enters a disabled, endless loop.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200853static void con3215_flush(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
855 struct raw3215_info *raw;
856 unsigned long flags;
857
858 raw = raw3215[0]; /* console 3215 is the first one */
Jiri Slaby8dd360f2012-04-11 11:14:58 +0200859 if (raw->port.flags & ASYNC_SUSPENDED)
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200860 /* The console is still frozen for suspend. */
Sebastian Ottf10ccca2013-04-13 12:56:51 +0200861 if (ccw_device_force_console(raw->cdev))
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200862 /* Forcing didn't work, no panic message .. */
863 return;
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100864 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +0100866 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867}
868
Holger Smolinski2332ce12008-10-10 21:33:27 +0200869static int con3215_notify(struct notifier_block *self,
870 unsigned long event, void *data)
871{
872 con3215_flush();
873 return NOTIFY_OK;
874}
875
876static struct notifier_block on_panic_nb = {
877 .notifier_call = con3215_notify,
878 .priority = 0,
879};
880
881static struct notifier_block on_reboot_nb = {
882 .notifier_call = con3215_notify,
883 .priority = 0,
884};
885
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886/*
887 * The console structure for the 3215 console
888 */
889static struct console con3215 = {
890 .name = "ttyS",
891 .write = con3215_write,
892 .device = con3215_device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 .flags = CON_PRINTBUFFER,
894};
895
896/*
897 * 3215 console initialization code called from console_init().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200899static int __init con3215_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
901 struct ccw_device *cdev;
902 struct raw3215_info *raw;
903 struct raw3215_req *req;
904 int i;
905
906 /* Check if 3215 is to be the console */
907 if (!CONSOLE_IS_3215)
908 return -ENODEV;
909
910 /* Set the console mode for VM */
911 if (MACHINE_IS_VM) {
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700912 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
913 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 }
915
916 /* allocate 3215 request structures */
917 raw3215_freelist = NULL;
918 spin_lock_init(&raw3215_freelist_lock);
919 for (i = 0; i < NR_3215_REQ; i++) {
Heiko Carstens6d56eee2009-06-22 12:08:04 +0200920 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 req->next = raw3215_freelist;
922 raw3215_freelist = req;
923 }
924
Sebastian Ott1e532092014-01-27 13:28:10 +0100925 cdev = ccw_device_create_console(&raw3215_ccw_driver);
Peter Oberparleiter600b5d12006-02-01 03:06:35 -0800926 if (IS_ERR(cdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 return -ENODEV;
928
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200929 raw3215[0] = raw = raw3215_alloc_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 raw->cdev = cdev;
Greg Kroah-Hartmandff59b62009-05-04 12:40:54 -0700931 dev_set_drvdata(&cdev->dev, raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 cdev->handler = raw3215_irq;
933
Heiko Carstens6673cd02013-01-03 14:31:53 +0100934 raw->flags |= RAW3215_FIXED;
Sebastian Ott1e532092014-01-27 13:28:10 +0100935 if (ccw_device_enable_console(cdev)) {
936 ccw_device_destroy_console(cdev);
937 raw3215_free_info(raw);
938 raw3215[0] = NULL;
939 return -ENODEV;
940 }
Heiko Carstens6673cd02013-01-03 14:31:53 +0100941
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 /* Request the console irq */
943 if (raw3215_startup(raw) != 0) {
Jiri Slabyfe2fc9c2012-04-02 13:54:08 +0200944 raw3215_free_info(raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 raw3215[0] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 return -ENODEV;
947 }
Holger Smolinski2332ce12008-10-10 21:33:27 +0200948 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
949 register_reboot_notifier(&on_reboot_nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 register_console(&con3215);
951 return 0;
952}
953console_initcall(con3215_init);
954#endif
955
Jiri Slabyd2281102012-08-07 21:47:58 +0200956static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
957{
958 struct raw3215_info *raw;
959
960 raw = raw3215[tty->index];
961 if (raw == NULL)
962 return -ENODEV;
963
964 tty->driver_data = raw;
965
966 return tty_port_install(&raw->port, driver, tty);
967}
968
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969/*
970 * tty3215_open
971 *
972 * This routine is called whenever a 3215 tty is opened.
973 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200974static int tty3215_open(struct tty_struct *tty, struct file * filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975{
Jiri Slabyd2281102012-08-07 21:47:58 +0200976 struct raw3215_info *raw = tty->driver_data;
Jiri Slaby410235f2012-03-05 14:52:01 +0100977 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Jiri Slaby86b260072012-04-11 11:14:59 +0200979 tty_port_tty_set(&raw->port, tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Jiri Slabyd6c53c02013-01-03 15:53:05 +0100981 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 /*
983 * Start up 3215 device
984 */
985 retval = raw3215_startup(raw);
986 if (retval)
987 return retval;
988
989 return 0;
990}
991
992/*
993 * tty3215_close()
994 *
995 * This routine is called when the 3215 tty is closed. We wait
996 * for the remaining request to be completed. Then we clean up.
997 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +0200998static void tty3215_close(struct tty_struct *tty, struct file * filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999{
1000 struct raw3215_info *raw;
1001
1002 raw = (struct raw3215_info *) tty->driver_data;
1003 if (raw == NULL || tty->count > 1)
1004 return;
1005 tty->closing = 1;
1006 /* Shutdown the terminal */
1007 raw3215_shutdown(raw);
Martin Schwidefsky656d9122012-02-17 10:29:22 +01001008 tasklet_kill(&raw->tlet);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 tty->closing = 0;
Jiri Slaby86b260072012-04-11 11:14:59 +02001010 tty_port_tty_set(&raw->port, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011}
1012
1013/*
1014 * Returns the amount of free space in the output buffer.
1015 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001016static int tty3215_write_room(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
1018 struct raw3215_info *raw;
1019
1020 raw = (struct raw3215_info *) tty->driver_data;
1021
1022 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1023 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1024 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1025 else
1026 return 0;
1027}
1028
1029/*
1030 * String write routine for 3215 ttys
1031 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001032static int tty3215_write(struct tty_struct * tty,
1033 const unsigned char *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034{
1035 struct raw3215_info *raw;
1036
1037 if (!tty)
1038 return 0;
1039 raw = (struct raw3215_info *) tty->driver_data;
1040 raw3215_write(raw, buf, count);
1041 return count;
1042}
1043
1044/*
1045 * Put character routine for 3215 ttys
1046 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001047static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048{
1049 struct raw3215_info *raw;
1050
1051 if (!tty)
Alan Cox9e7c9a12008-04-30 00:54:00 -07001052 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 raw = (struct raw3215_info *) tty->driver_data;
1054 raw3215_putchar(raw, ch);
Alan Cox9e7c9a12008-04-30 00:54:00 -07001055 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056}
1057
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001058static void tty3215_flush_chars(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059{
1060}
1061
1062/*
1063 * Returns the number of characters in the output buffer
1064 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001065static int tty3215_chars_in_buffer(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066{
1067 struct raw3215_info *raw;
1068
1069 raw = (struct raw3215_info *) tty->driver_data;
1070 return raw->count;
1071}
1072
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001073static void tty3215_flush_buffer(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074{
1075 struct raw3215_info *raw;
1076
1077 raw = (struct raw3215_info *) tty->driver_data;
1078 raw3215_flush_buffer(raw);
1079 tty_wakeup(tty);
1080}
1081
1082/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 * Disable reading from a 3215 tty
1084 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001085static void tty3215_throttle(struct tty_struct * tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
1087 struct raw3215_info *raw;
1088
1089 raw = (struct raw3215_info *) tty->driver_data;
1090 raw->flags |= RAW3215_THROTTLED;
1091}
1092
1093/*
1094 * Enable reading from a 3215 tty
1095 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001096static void tty3215_unthrottle(struct tty_struct * tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097{
1098 struct raw3215_info *raw;
1099 unsigned long flags;
1100
1101 raw = (struct raw3215_info *) tty->driver_data;
1102 if (raw->flags & RAW3215_THROTTLED) {
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001103 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 raw->flags &= ~RAW3215_THROTTLED;
1105 raw3215_try_io(raw);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001106 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 }
1108}
1109
1110/*
1111 * Disable writing to a 3215 tty
1112 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001113static void tty3215_stop(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114{
1115 struct raw3215_info *raw;
1116
1117 raw = (struct raw3215_info *) tty->driver_data;
1118 raw->flags |= RAW3215_STOPPED;
1119}
1120
1121/*
1122 * Enable writing to a 3215 tty
1123 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001124static void tty3215_start(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125{
1126 struct raw3215_info *raw;
1127 unsigned long flags;
1128
1129 raw = (struct raw3215_info *) tty->driver_data;
1130 if (raw->flags & RAW3215_STOPPED) {
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001131 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 raw->flags &= ~RAW3215_STOPPED;
1133 raw3215_try_io(raw);
Martin Schwidefsky520a4e32006-12-04 15:40:07 +01001134 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 }
1136}
1137
Jeff Dikeb68e31d2006-10-02 02:17:18 -07001138static const struct tty_operations tty3215_ops = {
Jiri Slabyd2281102012-08-07 21:47:58 +02001139 .install = tty3215_install,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 .open = tty3215_open,
1141 .close = tty3215_close,
1142 .write = tty3215_write,
1143 .put_char = tty3215_put_char,
1144 .flush_chars = tty3215_flush_chars,
1145 .write_room = tty3215_write_room,
1146 .chars_in_buffer = tty3215_chars_in_buffer,
1147 .flush_buffer = tty3215_flush_buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 .throttle = tty3215_throttle,
1149 .unthrottle = tty3215_unthrottle,
1150 .stop = tty3215_stop,
1151 .start = tty3215_start,
1152};
1153
1154/*
1155 * 3215 tty registration code called from tty_init().
1156 * Most kernel services (incl. kmalloc) are available at this poimt.
1157 */
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001158static int __init tty3215_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159{
1160 struct tty_driver *driver;
1161 int ret;
1162
1163 if (!CONSOLE_IS_3215)
1164 return 0;
1165
1166 driver = alloc_tty_driver(NR_3215);
1167 if (!driver)
1168 return -ENOMEM;
1169
1170 ret = ccw_driver_register(&raw3215_ccw_driver);
1171 if (ret) {
1172 put_tty_driver(driver);
1173 return ret;
1174 }
1175 /*
1176 * Initialize the tty_driver structure
1177 * Entries in tty3215_driver that are NOT initialized:
1178 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1179 */
1180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 driver->driver_name = "tty3215";
1182 driver->name = "ttyS";
1183 driver->major = TTY_MAJOR;
1184 driver->minor_start = 64;
1185 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1186 driver->subtype = SYSTEM_TYPE_TTY;
1187 driver->init_termios = tty_std_termios;
1188 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1189 driver->init_termios.c_oflag = ONLCR | XTABS;
1190 driver->init_termios.c_lflag = ISIG;
1191 driver->flags = TTY_DRIVER_REAL_RAW;
1192 tty_set_operations(driver, &tty3215_ops);
1193 ret = tty_register_driver(driver);
1194 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 put_tty_driver(driver);
1196 return ret;
1197 }
1198 tty3215_driver = driver;
1199 return 0;
1200}
1201
Martin Schwidefsky77812a22009-06-16 10:30:29 +02001202static void __exit tty3215_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203{
1204 tty_unregister_driver(tty3215_driver);
1205 put_tty_driver(tty3215_driver);
1206 ccw_driver_unregister(&raw3215_ccw_driver);
1207}
1208
1209module_init(tty3215_init);
1210module_exit(tty3215_exit);