Merge branch 'linux-2.6' into for-2.6.24
[linux-2.6] / drivers / s390 / char / con3215.c
1 /*
2  *  drivers/s390/char/con3215.c
3  *    3215 line mode terminal driver.
4  *
5  *  S390 version
6  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
7  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
8  *
9  *  Updated:
10  *   Aug-2000: Added tab support
11  *             Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu)
12  */
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kdev_t.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/vt_kern.h>
20 #include <linux/init.h>
21 #include <linux/console.h>
22 #include <linux/interrupt.h>
23 #include <linux/err.h>
24
25 #include <linux/slab.h>
26 #include <linux/bootmem.h>
27
28 #include <asm/ccwdev.h>
29 #include <asm/cio.h>
30 #include <asm/io.h>
31 #include <asm/ebcdic.h>
32 #include <asm/uaccess.h>
33 #include <asm/delay.h>
34 #include <asm/cpcmd.h>
35 #include <asm/setup.h>
36
37 #include "ctrlchar.h"
38
39 #define NR_3215             1
40 #define NR_3215_REQ         (4*NR_3215)
41 #define RAW3215_BUFFER_SIZE 65536     /* output buffer size */
42 #define RAW3215_INBUF_SIZE  256       /* input buffer size */
43 #define RAW3215_MIN_SPACE   128       /* minimum free space for wakeup */
44 #define RAW3215_MIN_WRITE   1024      /* min. length for immediate output */
45 #define RAW3215_MAX_BYTES   3968      /* max. bytes to write with one ssch */
46 #define RAW3215_MAX_NEWLINE 50        /* max. lines to write with one ssch */
47 #define RAW3215_NR_CCWS     3
48 #define RAW3215_TIMEOUT     HZ/10     /* time for delayed output */
49
50 #define RAW3215_FIXED       1         /* 3215 console device is not be freed */
51 #define RAW3215_ACTIVE      2         /* set if the device is in use */
52 #define RAW3215_WORKING     4         /* set if a request is being worked on */
53 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
54 #define RAW3215_STOPPED     16        /* set if writing is disabled */
55 #define RAW3215_CLOSING     32        /* set while in close process */
56 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
57 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
58
59 #define TAB_STOP_SIZE       8         /* tab stop size */
60
61 /*
62  * Request types for a 3215 device
63  */
64 enum raw3215_type {
65         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
66 };
67
68 /*
69  * Request structure for a 3215 device
70  */
71 struct raw3215_req {
72         enum raw3215_type type;       /* type of the request */
73         int start, len;               /* start index & len in output buffer */
74         int delayable;                /* indication to wait for more data */
75         int residual;                 /* residual count for read request */
76         struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
77         struct raw3215_info *info;    /* pointer to main structure */
78         struct raw3215_req *next;     /* pointer to next request */
79 } __attribute__ ((aligned(8)));
80
81 struct raw3215_info {
82         struct ccw_device *cdev;      /* device for tty driver */
83         spinlock_t *lock;             /* pointer to irq lock */
84         int flags;                    /* state flags */
85         char *buffer;                 /* pointer to output buffer */
86         char *inbuf;                  /* pointer to input buffer */
87         int head;                     /* first free byte in output buffer */
88         int count;                    /* number of bytes in output buffer */
89         int written;                  /* number of bytes in write requests */
90         struct tty_struct *tty;       /* pointer to tty structure if present */
91         struct tasklet_struct tasklet;
92         struct raw3215_req *queued_read; /* pointer to queued read requests */
93         struct raw3215_req *queued_write;/* pointer to queued write requests */
94         wait_queue_head_t empty_wait; /* wait queue for flushing */
95         struct timer_list timer;      /* timer for delayed output */
96         char *message;                /* pending message from raw3215_irq */
97         int msg_dstat;                /* dstat for pending message */
98         int msg_cstat;                /* cstat for pending message */
99         int line_pos;                 /* position on the line (for tabs) */
100         char ubuffer[80];             /* copy_from_user buffer */
101 };
102
103 /* array of 3215 devices structures */
104 static struct raw3215_info *raw3215[NR_3215];
105 /* spinlock to protect the raw3215 array */
106 static DEFINE_SPINLOCK(raw3215_device_lock);
107 /* list of free request structures */
108 static struct raw3215_req *raw3215_freelist;
109 /* spinlock to protect free list */
110 static spinlock_t raw3215_freelist_lock;
111
112 static struct tty_driver *tty3215_driver;
113
114 /*
115  * Get a request structure from the free list
116  */
117 static inline struct raw3215_req *
118 raw3215_alloc_req(void) {
119         struct raw3215_req *req;
120         unsigned long flags;
121
122         spin_lock_irqsave(&raw3215_freelist_lock, flags);
123         req = raw3215_freelist;
124         raw3215_freelist = req->next;
125         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
126         return req;
127 }
128
129 /*
130  * Put a request structure back to the free list
131  */
132 static inline void
133 raw3215_free_req(struct raw3215_req *req) {
134         unsigned long flags;
135
136         if (req->type == RAW3215_FREE)
137                 return;         /* don't free a free request */
138         req->type = RAW3215_FREE;
139         spin_lock_irqsave(&raw3215_freelist_lock, flags);
140         req->next = raw3215_freelist;
141         raw3215_freelist = req;
142         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
143 }
144
145 /*
146  * Set up a read request that reads up to 160 byte from the 3215 device.
147  * If there is a queued read request it is used, but that shouldn't happen
148  * because a 3215 terminal won't accept a new read before the old one is
149  * completed.
150  */
151 static void
152 raw3215_mk_read_req(struct raw3215_info *raw)
153 {
154         struct raw3215_req *req;
155         struct ccw1 *ccw;
156
157         /* there can only be ONE read request at a time */
158         req = raw->queued_read;
159         if (req == NULL) {
160                 /* no queued read request, use new req structure */
161                 req = raw3215_alloc_req();
162                 req->type = RAW3215_READ;
163                 req->info = raw;
164                 raw->queued_read = req;
165         }
166
167         ccw = req->ccws;
168         ccw->cmd_code = 0x0A; /* read inquiry */
169         ccw->flags = 0x20;    /* ignore incorrect length */
170         ccw->count = 160;
171         ccw->cda = (__u32) __pa(raw->inbuf);
172 }
173
174 /*
175  * Set up a write request with the information from the main structure.
176  * A ccw chain is created that writes as much as possible from the output
177  * buffer to the 3215 device. If a queued write exists it is replaced by
178  * the new, probably lengthened request.
179  */
180 static void
181 raw3215_mk_write_req(struct raw3215_info *raw)
182 {
183         struct raw3215_req *req;
184         struct ccw1 *ccw;
185         int len, count, ix, lines;
186
187         if (raw->count <= raw->written)
188                 return;
189         /* check if there is a queued write request */
190         req = raw->queued_write;
191         if (req == NULL) {
192                 /* no queued write request, use new req structure */
193                 req = raw3215_alloc_req();
194                 req->type = RAW3215_WRITE;
195                 req->info = raw;
196                 raw->queued_write = req;
197         } else {
198                 raw->written -= req->len;
199         }
200
201         ccw = req->ccws;
202         req->start = (raw->head - raw->count + raw->written) &
203                      (RAW3215_BUFFER_SIZE - 1);
204         /*
205          * now we have to count newlines. We can at max accept
206          * RAW3215_MAX_NEWLINE newlines in a single ssch due to
207          * a restriction in VM
208          */
209         lines = 0;
210         ix = req->start;
211         while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
212                 if (raw->buffer[ix] == 0x15)
213                         lines++;
214                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
215         }
216         len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
217         if (len > RAW3215_MAX_BYTES)
218                 len = RAW3215_MAX_BYTES;
219         req->len = len;
220         raw->written += len;
221
222         /* set the indication if we should try to enlarge this request */
223         req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
224
225         ix = req->start;
226         while (len > 0) {
227                 if (ccw > req->ccws)
228                         ccw[-1].flags |= 0x40; /* use command chaining */
229                 ccw->cmd_code = 0x01; /* write, auto carrier return */
230                 ccw->flags = 0x20;    /* ignore incorrect length ind.  */
231                 ccw->cda =
232                         (__u32) __pa(raw->buffer + ix);
233                 count = len;
234                 if (ix + count > RAW3215_BUFFER_SIZE)
235                         count = RAW3215_BUFFER_SIZE - ix;
236                 ccw->count = count;
237                 len -= count;
238                 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
239                 ccw++;
240         }
241         /*
242          * Add a NOP to the channel program. 3215 devices are purely
243          * emulated and its much better to avoid the channel end
244          * interrupt in this case.
245          */
246         if (ccw > req->ccws)
247                 ccw[-1].flags |= 0x40; /* use command chaining */
248         ccw->cmd_code = 0x03; /* NOP */
249         ccw->flags = 0;
250         ccw->cda = 0;
251         ccw->count = 1;
252 }
253
254 /*
255  * Start a read or a write request
256  */
257 static void
258 raw3215_start_io(struct raw3215_info *raw)
259 {
260         struct raw3215_req *req;
261         int res;
262
263         req = raw->queued_read;
264         if (req != NULL &&
265             !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
266                 /* dequeue request */
267                 raw->queued_read = NULL;
268                 res = ccw_device_start(raw->cdev, req->ccws,
269                                        (unsigned long) req, 0, 0);
270                 if (res != 0) {
271                         /* do_IO failed, put request back to queue */
272                         raw->queued_read = req;
273                 } else {
274                         raw->flags |= RAW3215_WORKING;
275                 }
276         }
277         req = raw->queued_write;
278         if (req != NULL &&
279             !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
280                 /* dequeue request */
281                 raw->queued_write = NULL;
282                 res = ccw_device_start(raw->cdev, req->ccws,
283                                        (unsigned long) req, 0, 0);
284                 if (res != 0) {
285                         /* do_IO failed, put request back to queue */
286                         raw->queued_write = req;
287                 } else {
288                         raw->flags |= RAW3215_WORKING;
289                 }
290         }
291 }
292
293 /*
294  * Function to start a delayed output after RAW3215_TIMEOUT seconds
295  */
296 static void
297 raw3215_timeout(unsigned long __data)
298 {
299         struct raw3215_info *raw = (struct raw3215_info *) __data;
300         unsigned long flags;
301
302         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
303         if (raw->flags & RAW3215_TIMER_RUNS) {
304                 del_timer(&raw->timer);
305                 raw->flags &= ~RAW3215_TIMER_RUNS;
306                 raw3215_mk_write_req(raw);
307                 raw3215_start_io(raw);
308         }
309         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
310 }
311
312 /*
313  * Function to conditionally start an IO. A read is started immediately,
314  * a write is only started immediately if the flush flag is on or the
315  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
316  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
317  */
318 static inline void
319 raw3215_try_io(struct raw3215_info *raw)
320 {
321         if (!(raw->flags & RAW3215_ACTIVE))
322                 return;
323         if (raw->queued_read != NULL)
324                 raw3215_start_io(raw);
325         else if (raw->queued_write != NULL) {
326                 if ((raw->queued_write->delayable == 0) ||
327                     (raw->flags & RAW3215_FLUSHING)) {
328                         /* execute write requests bigger than minimum size */
329                         raw3215_start_io(raw);
330                         if (raw->flags & RAW3215_TIMER_RUNS) {
331                                 del_timer(&raw->timer);
332                                 raw->flags &= ~RAW3215_TIMER_RUNS;
333                         }
334                 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
335                         /* delay small writes */
336                         init_timer(&raw->timer);
337                         raw->timer.expires = RAW3215_TIMEOUT + jiffies;
338                         raw->timer.data = (unsigned long) raw;
339                         raw->timer.function = raw3215_timeout;
340                         add_timer(&raw->timer);
341                         raw->flags |= RAW3215_TIMER_RUNS;
342                 }
343         }
344 }
345
346 /*
347  * The bottom half handler routine for 3215 devices. It tries to start
348  * the next IO and wakes up processes waiting on the tty.
349  */
350 static void
351 raw3215_tasklet(void *data)
352 {
353         struct raw3215_info *raw;
354         struct tty_struct *tty;
355         unsigned long flags;
356
357         raw = (struct raw3215_info *) data;
358         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
359         raw3215_mk_write_req(raw);
360         raw3215_try_io(raw);
361         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
362         /* Check for pending message from raw3215_irq */
363         if (raw->message != NULL) {
364                 printk(raw->message, raw->msg_dstat, raw->msg_cstat);
365                 raw->message = NULL;
366         }
367         tty = raw->tty;
368         if (tty != NULL &&
369             RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
370                 tty_wakeup(tty);
371         }
372 }
373
374 /*
375  * Interrupt routine, called from common io layer
376  */
377 static void
378 raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
379 {
380         struct raw3215_info *raw;
381         struct raw3215_req *req;
382         struct tty_struct *tty;
383         int cstat, dstat;
384         int count, slen;
385
386         raw = cdev->dev.driver_data;
387         req = (struct raw3215_req *) intparm;
388         cstat = irb->scsw.cstat;
389         dstat = irb->scsw.dstat;
390         if (cstat != 0) {
391                 raw->message = KERN_WARNING
392                         "Got nonzero channel status in raw3215_irq "
393                         "(dev sts 0x%2x, sch sts 0x%2x)";
394                 raw->msg_dstat = dstat;
395                 raw->msg_cstat = cstat;
396                 tasklet_schedule(&raw->tasklet);
397         }
398         if (dstat & 0x01) { /* we got a unit exception */
399                 dstat &= ~0x01;  /* we can ignore it */
400         }
401         switch (dstat) {
402         case 0x80:
403                 if (cstat != 0)
404                         break;
405                 /* Attention interrupt, someone hit the enter key */
406                 raw3215_mk_read_req(raw);
407                 if (MACHINE_IS_P390)
408                         memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
409                 tasklet_schedule(&raw->tasklet);
410                 break;
411         case 0x08:
412         case 0x0C:
413                 /* Channel end interrupt. */
414                 if ((raw = req->info) == NULL)
415                         return;              /* That shouldn't happen ... */
416                 if (req->type == RAW3215_READ) {
417                         /* store residual count, then wait for device end */
418                         req->residual = irb->scsw.count;
419                 }
420                 if (dstat == 0x08)
421                         break;
422         case 0x04:
423                 /* Device end interrupt. */
424                 if ((raw = req->info) == NULL)
425                         return;              /* That shouldn't happen ... */
426                 if (req->type == RAW3215_READ && raw->tty != NULL) {
427                         unsigned int cchar;
428
429                         tty = raw->tty;
430                         count = 160 - req->residual;
431                         if (MACHINE_IS_P390) {
432                                 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE);
433                                 if (count > slen)
434                                         count = slen;
435                         } else
436                         EBCASC(raw->inbuf, count);
437                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
438                         switch (cchar & CTRLCHAR_MASK) {
439                         case CTRLCHAR_SYSRQ:
440                                 break;
441
442                         case CTRLCHAR_CTRL:
443                                 tty_insert_flip_char(tty, cchar, TTY_NORMAL);
444                                 tty_flip_buffer_push(raw->tty);
445                                 break;
446
447                         case CTRLCHAR_NONE:
448                                 if (count < 2 ||
449                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
450                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
451                                         /* add the auto \n */
452                                         raw->inbuf[count] = '\n';
453                                         count++;
454                                 } else
455                                         count -= 2;
456                                 tty_insert_flip_string(tty, raw->inbuf, count);
457                                 tty_flip_buffer_push(raw->tty);
458                                 break;
459                         }
460                 } else if (req->type == RAW3215_WRITE) {
461                         raw->count -= req->len;
462                         raw->written -= req->len;
463                 }
464                 raw->flags &= ~RAW3215_WORKING;
465                 raw3215_free_req(req);
466                 /* check for empty wait */
467                 if (waitqueue_active(&raw->empty_wait) &&
468                     raw->queued_write == NULL &&
469                     raw->queued_read == NULL) {
470                         wake_up_interruptible(&raw->empty_wait);
471                 }
472                 tasklet_schedule(&raw->tasklet);
473                 break;
474         default:
475                 /* Strange interrupt, I'll do my best to clean up */
476                 if (req != NULL && req->type != RAW3215_FREE) {
477                         if (req->type == RAW3215_WRITE) {
478                                 raw->count -= req->len;
479                                 raw->written -= req->len;
480                         }
481                         raw->flags &= ~RAW3215_WORKING;
482                         raw3215_free_req(req);
483                 }
484                 raw->message = KERN_WARNING
485                         "Spurious interrupt in in raw3215_irq "
486                         "(dev sts 0x%2x, sch sts 0x%2x)";
487                 raw->msg_dstat = dstat;
488                 raw->msg_cstat = cstat;
489                 tasklet_schedule(&raw->tasklet);
490         }
491         return;
492 }
493
494 /*
495  * Wait until length bytes are available int the output buffer.
496  * Has to be called with the s390irq lock held. Can be called
497  * disabled.
498  */
499 static void
500 raw3215_make_room(struct raw3215_info *raw, unsigned int length)
501 {
502         while (RAW3215_BUFFER_SIZE - raw->count < length) {
503                 /* there might be a request pending */
504                 raw->flags |= RAW3215_FLUSHING;
505                 raw3215_mk_write_req(raw);
506                 raw3215_try_io(raw);
507                 raw->flags &= ~RAW3215_FLUSHING;
508 #ifdef CONFIG_TN3215_CONSOLE
509                 wait_cons_dev();
510 #endif
511                 /* Enough room freed up ? */
512                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
513                         break;
514                 /* there might be another cpu waiting for the lock */
515                 spin_unlock(get_ccwdev_lock(raw->cdev));
516                 udelay(100);
517                 spin_lock(get_ccwdev_lock(raw->cdev));
518         }
519 }
520
521 /*
522  * String write routine for 3215 devices
523  */
524 static void
525 raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length)
526 {
527         unsigned long flags;
528         int c, count;
529
530         while (length > 0) {
531                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
532                 count = (length > RAW3215_BUFFER_SIZE) ?
533                                              RAW3215_BUFFER_SIZE : length;
534                 length -= count;
535
536                 raw3215_make_room(raw, count);
537
538                 /* copy string to output buffer and convert it to EBCDIC */
539                 while (1) {
540                         c = min_t(int, count,
541                                   min(RAW3215_BUFFER_SIZE - raw->count,
542                                       RAW3215_BUFFER_SIZE - raw->head));
543                         if (c <= 0)
544                                 break;
545                         memcpy(raw->buffer + raw->head, str, c);
546                         ASCEBC(raw->buffer + raw->head, c);
547                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
548                         raw->count += c;
549                         raw->line_pos += c;
550                         str += c;
551                         count -= c;
552                 }
553                 if (!(raw->flags & RAW3215_WORKING)) {
554                         raw3215_mk_write_req(raw);
555                         /* start or queue request */
556                         raw3215_try_io(raw);
557                 }
558                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
559         }
560 }
561
562 /*
563  * Put character routine for 3215 devices
564  */
565 static void
566 raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
567 {
568         unsigned long flags;
569         unsigned int length, i;
570
571         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
572         if (ch == '\t') {
573                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
574                 raw->line_pos += length;
575                 ch = ' ';
576         } else if (ch == '\n') {
577                 length = 1;
578                 raw->line_pos = 0;
579         } else {
580                 length = 1;
581                 raw->line_pos++;
582         }
583         raw3215_make_room(raw, length);
584
585         for (i = 0; i < length; i++) {
586                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
587                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
588                 raw->count++;
589         }
590         if (!(raw->flags & RAW3215_WORKING)) {
591                 raw3215_mk_write_req(raw);
592                 /* start or queue request */
593                 raw3215_try_io(raw);
594         }
595         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
596 }
597
598 /*
599  * Flush routine, it simply sets the flush flag and tries to start
600  * pending IO.
601  */
602 static void
603 raw3215_flush_buffer(struct raw3215_info *raw)
604 {
605         unsigned long flags;
606
607         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
608         if (raw->count > 0) {
609                 raw->flags |= RAW3215_FLUSHING;
610                 raw3215_try_io(raw);
611                 raw->flags &= ~RAW3215_FLUSHING;
612         }
613         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
614 }
615
616 /*
617  * Fire up a 3215 device.
618  */
619 static int
620 raw3215_startup(struct raw3215_info *raw)
621 {
622         unsigned long flags;
623
624         if (raw->flags & RAW3215_ACTIVE)
625                 return 0;
626         raw->line_pos = 0;
627         raw->flags |= RAW3215_ACTIVE;
628         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
629         raw3215_try_io(raw);
630         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
631
632         return 0;
633 }
634
635 /*
636  * Shutdown a 3215 device.
637  */
638 static void
639 raw3215_shutdown(struct raw3215_info *raw)
640 {
641         DECLARE_WAITQUEUE(wait, current);
642         unsigned long flags;
643
644         if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
645                 return;
646         /* Wait for outstanding requests, then free irq */
647         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
648         if ((raw->flags & RAW3215_WORKING) ||
649             raw->queued_write != NULL ||
650             raw->queued_read != NULL) {
651                 raw->flags |= RAW3215_CLOSING;
652                 add_wait_queue(&raw->empty_wait, &wait);
653                 set_current_state(TASK_INTERRUPTIBLE);
654                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
655                 schedule();
656                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
657                 remove_wait_queue(&raw->empty_wait, &wait);
658                 set_current_state(TASK_RUNNING);
659                 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING);
660         }
661         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
662 }
663
664 static int
665 raw3215_probe (struct ccw_device *cdev)
666 {
667         struct raw3215_info *raw;
668         int line;
669
670         raw = kmalloc(sizeof(struct raw3215_info) +
671                       RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
672         if (raw == NULL)
673                 return -ENOMEM;
674
675         spin_lock(&raw3215_device_lock);
676         for (line = 0; line < NR_3215; line++) {
677                 if (!raw3215[line]) {
678                         raw3215[line] = raw;
679                         break;
680                 }
681         }
682         spin_unlock(&raw3215_device_lock);
683         if (line == NR_3215) {
684                 kfree(raw);
685                 return -ENODEV;
686         }
687
688         raw->cdev = cdev;
689         raw->inbuf = (char *) raw + sizeof(struct raw3215_info);
690         memset(raw, 0, sizeof(struct raw3215_info));
691         raw->buffer = kmalloc(RAW3215_BUFFER_SIZE,
692                                        GFP_KERNEL|GFP_DMA);
693         if (raw->buffer == NULL) {
694                 spin_lock(&raw3215_device_lock);
695                 raw3215[line] = NULL;
696                 spin_unlock(&raw3215_device_lock);
697                 kfree(raw);
698                 return -ENOMEM;
699         }
700         tasklet_init(&raw->tasklet,
701                      (void (*)(unsigned long)) raw3215_tasklet,
702                      (unsigned long) raw);
703         init_waitqueue_head(&raw->empty_wait);
704
705         cdev->dev.driver_data = raw;
706         cdev->handler = raw3215_irq;
707
708         return 0;
709 }
710
711 static void
712 raw3215_remove (struct ccw_device *cdev)
713 {
714         struct raw3215_info *raw;
715
716         ccw_device_set_offline(cdev);
717         raw = cdev->dev.driver_data;
718         if (raw) {
719                 cdev->dev.driver_data = NULL;
720                 kfree(raw->buffer);
721                 kfree(raw);
722         }
723 }
724
725 static int
726 raw3215_set_online (struct ccw_device *cdev)
727 {
728         struct raw3215_info *raw;
729
730         raw = cdev->dev.driver_data;
731         if (!raw)
732                 return -ENODEV;
733
734         return raw3215_startup(raw);
735 }
736
737 static int
738 raw3215_set_offline (struct ccw_device *cdev)
739 {
740         struct raw3215_info *raw;
741
742         raw = cdev->dev.driver_data;
743         if (!raw)
744                 return -ENODEV;
745
746         raw3215_shutdown(raw);
747
748         return 0;
749 }
750
751 static struct ccw_device_id raw3215_id[] = {
752         { CCW_DEVICE(0x3215, 0) },
753         { /* end of list */ },
754 };
755
756 static struct ccw_driver raw3215_ccw_driver = {
757         .name           = "3215",
758         .owner          = THIS_MODULE,
759         .ids            = raw3215_id,
760         .probe          = &raw3215_probe,
761         .remove         = &raw3215_remove,
762         .set_online     = &raw3215_set_online,
763         .set_offline    = &raw3215_set_offline,
764 };
765
766 #ifdef CONFIG_TN3215_CONSOLE
767 /*
768  * Write a string to the 3215 console
769  */
770 static void
771 con3215_write(struct console *co, const char *str, unsigned int count)
772 {
773         struct raw3215_info *raw;
774         int i;
775
776         if (count <= 0)
777                 return;
778         raw = raw3215[0];       /* console 3215 is the first one */
779         while (count > 0) {
780                 for (i = 0; i < count; i++)
781                         if (str[i] == '\t' || str[i] == '\n')
782                                 break;
783                 raw3215_write(raw, str, i);
784                 count -= i;
785                 str += i;
786                 if (count > 0) {
787                         raw3215_putchar(raw, *str);
788                         count--;
789                         str++;
790                 }
791         }
792 }
793
794 static struct tty_driver *con3215_device(struct console *c, int *index)
795 {
796         *index = c->index;
797         return tty3215_driver;
798 }
799
800 /*
801  * panic() calls console_unblank before the system enters a
802  * disabled, endless loop.
803  */
804 static void
805 con3215_unblank(void)
806 {
807         struct raw3215_info *raw;
808         unsigned long flags;
809
810         raw = raw3215[0];  /* console 3215 is the first one */
811         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
812         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
813         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
814 }
815
816 /*
817  *  The console structure for the 3215 console
818  */
819 static struct console con3215 = {
820         .name    = "ttyS",
821         .write   = con3215_write,
822         .device  = con3215_device,
823         .unblank = con3215_unblank,
824         .flags   = CON_PRINTBUFFER,
825 };
826
827 /*
828  * 3215 console initialization code called from console_init().
829  * NOTE: This is called before kmalloc is available.
830  */
831 static int __init
832 con3215_init(void)
833 {
834         struct ccw_device *cdev;
835         struct raw3215_info *raw;
836         struct raw3215_req *req;
837         int i;
838
839         /* Check if 3215 is to be the console */
840         if (!CONSOLE_IS_3215)
841                 return -ENODEV;
842
843         /* Set the console mode for VM */
844         if (MACHINE_IS_VM) {
845                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
846                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
847         }
848
849         /* allocate 3215 request structures */
850         raw3215_freelist = NULL;
851         spin_lock_init(&raw3215_freelist_lock);
852         for (i = 0; i < NR_3215_REQ; i++) {
853                 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req));
854                 req->next = raw3215_freelist;
855                 raw3215_freelist = req;
856         }
857
858         cdev = ccw_device_probe_console();
859         if (IS_ERR(cdev))
860                 return -ENODEV;
861
862         raw3215[0] = raw = (struct raw3215_info *)
863                 alloc_bootmem_low(sizeof(struct raw3215_info));
864         memset(raw, 0, sizeof(struct raw3215_info));
865         raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
866         raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
867         raw->cdev = cdev;
868         cdev->dev.driver_data = raw;
869         cdev->handler = raw3215_irq;
870
871         raw->flags |= RAW3215_FIXED;
872         tasklet_init(&raw->tasklet,
873                      (void (*)(unsigned long)) raw3215_tasklet,
874                      (unsigned long) raw);
875         init_waitqueue_head(&raw->empty_wait);
876
877         /* Request the console irq */
878         if (raw3215_startup(raw) != 0) {
879                 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
880                 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
881                 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info));
882                 raw3215[0] = NULL;
883                 printk("Couldn't find a 3215 console device\n");
884                 return -ENODEV;
885         }
886         register_console(&con3215);
887         return 0;
888 }
889 console_initcall(con3215_init);
890 #endif
891
892 /*
893  * tty3215_open
894  *
895  * This routine is called whenever a 3215 tty is opened.
896  */
897 static int
898 tty3215_open(struct tty_struct *tty, struct file * filp)
899 {
900         struct raw3215_info *raw;
901         int retval, line;
902
903         line = tty->index;
904         if ((line < 0) || (line >= NR_3215))
905                 return -ENODEV;
906
907         raw = raw3215[line];
908         if (raw == NULL)
909                 return -ENODEV;
910
911         tty->driver_data = raw;
912         raw->tty = tty;
913
914         tty->low_latency = 0;  /* don't use bottom half for pushing chars */
915         /*
916          * Start up 3215 device
917          */
918         retval = raw3215_startup(raw);
919         if (retval)
920                 return retval;
921
922         return 0;
923 }
924
925 /*
926  * tty3215_close()
927  *
928  * This routine is called when the 3215 tty is closed. We wait
929  * for the remaining request to be completed. Then we clean up.
930  */
931 static void
932 tty3215_close(struct tty_struct *tty, struct file * filp)
933 {
934         struct raw3215_info *raw;
935
936         raw = (struct raw3215_info *) tty->driver_data;
937         if (raw == NULL || tty->count > 1)
938                 return;
939         tty->closing = 1;
940         /* Shutdown the terminal */
941         raw3215_shutdown(raw);
942         tty->closing = 0;
943         raw->tty = NULL;
944 }
945
946 /*
947  * Returns the amount of free space in the output buffer.
948  */
949 static int
950 tty3215_write_room(struct tty_struct *tty)
951 {
952         struct raw3215_info *raw;
953
954         raw = (struct raw3215_info *) tty->driver_data;
955
956         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
957         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
958                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
959         else
960                 return 0;
961 }
962
963 /*
964  * String write routine for 3215 ttys
965  */
966 static int
967 tty3215_write(struct tty_struct * tty,
968               const unsigned char *buf, int count)
969 {
970         struct raw3215_info *raw;
971
972         if (!tty)
973                 return 0;
974         raw = (struct raw3215_info *) tty->driver_data;
975         raw3215_write(raw, buf, count);
976         return count;
977 }
978
979 /*
980  * Put character routine for 3215 ttys
981  */
982 static void
983 tty3215_put_char(struct tty_struct *tty, unsigned char ch)
984 {
985         struct raw3215_info *raw;
986
987         if (!tty)
988                 return;
989         raw = (struct raw3215_info *) tty->driver_data;
990         raw3215_putchar(raw, ch);
991 }
992
993 static void
994 tty3215_flush_chars(struct tty_struct *tty)
995 {
996 }
997
998 /*
999  * Returns the number of characters in the output buffer
1000  */
1001 static int
1002 tty3215_chars_in_buffer(struct tty_struct *tty)
1003 {
1004         struct raw3215_info *raw;
1005
1006         raw = (struct raw3215_info *) tty->driver_data;
1007         return raw->count;
1008 }
1009
1010 static void
1011 tty3215_flush_buffer(struct tty_struct *tty)
1012 {
1013         struct raw3215_info *raw;
1014
1015         raw = (struct raw3215_info *) tty->driver_data;
1016         raw3215_flush_buffer(raw);
1017         tty_wakeup(tty);
1018 }
1019
1020 /*
1021  * Currently we don't have any io controls for 3215 ttys
1022  */
1023 static int
1024 tty3215_ioctl(struct tty_struct *tty, struct file * file,
1025               unsigned int cmd, unsigned long arg)
1026 {
1027         if (tty->flags & (1 << TTY_IO_ERROR))
1028                 return -EIO;
1029
1030         switch (cmd) {
1031         default:
1032                 return -ENOIOCTLCMD;
1033         }
1034         return 0;
1035 }
1036
1037 /*
1038  * Disable reading from a 3215 tty
1039  */
1040 static void
1041 tty3215_throttle(struct tty_struct * tty)
1042 {
1043         struct raw3215_info *raw;
1044
1045         raw = (struct raw3215_info *) tty->driver_data;
1046         raw->flags |= RAW3215_THROTTLED;
1047 }
1048
1049 /*
1050  * Enable reading from a 3215 tty
1051  */
1052 static void
1053 tty3215_unthrottle(struct tty_struct * tty)
1054 {
1055         struct raw3215_info *raw;
1056         unsigned long flags;
1057
1058         raw = (struct raw3215_info *) tty->driver_data;
1059         if (raw->flags & RAW3215_THROTTLED) {
1060                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1061                 raw->flags &= ~RAW3215_THROTTLED;
1062                 raw3215_try_io(raw);
1063                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1064         }
1065 }
1066
1067 /*
1068  * Disable writing to a 3215 tty
1069  */
1070 static void
1071 tty3215_stop(struct tty_struct *tty)
1072 {
1073         struct raw3215_info *raw;
1074
1075         raw = (struct raw3215_info *) tty->driver_data;
1076         raw->flags |= RAW3215_STOPPED;
1077 }
1078
1079 /*
1080  * Enable writing to a 3215 tty
1081  */
1082 static void
1083 tty3215_start(struct tty_struct *tty)
1084 {
1085         struct raw3215_info *raw;
1086         unsigned long flags;
1087
1088         raw = (struct raw3215_info *) tty->driver_data;
1089         if (raw->flags & RAW3215_STOPPED) {
1090                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1091                 raw->flags &= ~RAW3215_STOPPED;
1092                 raw3215_try_io(raw);
1093                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1094         }
1095 }
1096
1097 static const struct tty_operations tty3215_ops = {
1098         .open = tty3215_open,
1099         .close = tty3215_close,
1100         .write = tty3215_write,
1101         .put_char = tty3215_put_char,
1102         .flush_chars = tty3215_flush_chars,
1103         .write_room = tty3215_write_room,
1104         .chars_in_buffer = tty3215_chars_in_buffer,
1105         .flush_buffer = tty3215_flush_buffer,
1106         .ioctl = tty3215_ioctl,
1107         .throttle = tty3215_throttle,
1108         .unthrottle = tty3215_unthrottle,
1109         .stop = tty3215_stop,
1110         .start = tty3215_start,
1111 };
1112
1113 /*
1114  * 3215 tty registration code called from tty_init().
1115  * Most kernel services (incl. kmalloc) are available at this poimt.
1116  */
1117 static int __init
1118 tty3215_init(void)
1119 {
1120         struct tty_driver *driver;
1121         int ret;
1122
1123         if (!CONSOLE_IS_3215)
1124                 return 0;
1125
1126         driver = alloc_tty_driver(NR_3215);
1127         if (!driver)
1128                 return -ENOMEM;
1129
1130         ret = ccw_driver_register(&raw3215_ccw_driver);
1131         if (ret) {
1132                 put_tty_driver(driver);
1133                 return ret;
1134         }
1135         /*
1136          * Initialize the tty_driver structure
1137          * Entries in tty3215_driver that are NOT initialized:
1138          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1139          */
1140
1141         driver->owner = THIS_MODULE;
1142         driver->driver_name = "tty3215";
1143         driver->name = "ttyS";
1144         driver->major = TTY_MAJOR;
1145         driver->minor_start = 64;
1146         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1147         driver->subtype = SYSTEM_TYPE_TTY;
1148         driver->init_termios = tty_std_termios;
1149         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1150         driver->init_termios.c_oflag = ONLCR | XTABS;
1151         driver->init_termios.c_lflag = ISIG;
1152         driver->flags = TTY_DRIVER_REAL_RAW;
1153         tty_set_operations(driver, &tty3215_ops);
1154         ret = tty_register_driver(driver);
1155         if (ret) {
1156                 printk("Couldn't register tty3215 driver\n");
1157                 put_tty_driver(driver);
1158                 return ret;
1159         }
1160         tty3215_driver = driver;
1161         return 0;
1162 }
1163
1164 static void __exit
1165 tty3215_exit(void)
1166 {
1167         tty_unregister_driver(tty3215_driver);
1168         put_tty_driver(tty3215_driver);
1169         ccw_driver_unregister(&raw3215_ccw_driver);
1170 }
1171
1172 module_init(tty3215_init);
1173 module_exit(tty3215_exit);