2 * 3215 line mode terminal driver.
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
8 * Aug-2000: Added tab support
9 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kdev_t.h>
15 #include <linux/tty.h>
16 #include <linux/tty_flip.h>
17 #include <linux/vt_kern.h>
18 #include <linux/init.h>
19 #include <linux/console.h>
20 #include <linux/interrupt.h>
21 #include <linux/err.h>
22 #include <linux/reboot.h>
23 #include <linux/serial.h> /* ASYNC_* flags */
24 #include <linux/slab.h>
25 #include <asm/ccwdev.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>
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 */
47 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */
48 #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 */
51 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
52 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
54 #define TAB_STOP_SIZE 8 /* tab stop size */
57 * Request types for a 3215 device
60 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
64 * Request structure for a 3215 device
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)));
78 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 */
86 struct raw3215_req *queued_read; /* pointer to queued read requests */
87 struct raw3215_req *queued_write;/* pointer to queued write requests */
88 struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */
89 wait_queue_head_t empty_wait; /* wait queue for flushing */
90 struct timer_list timer; /* timer for delayed output */
91 int line_pos; /* position on the line (for tabs) */
92 char ubuffer[80]; /* copy_from_user buffer */
95 /* array of 3215 devices structures */
96 static struct raw3215_info *raw3215[NR_3215];
97 /* spinlock to protect the raw3215 array */
98 static DEFINE_SPINLOCK(raw3215_device_lock);
99 /* list of free request structures */
100 static struct raw3215_req *raw3215_freelist;
101 /* spinlock to protect free list */
102 static spinlock_t raw3215_freelist_lock;
104 static struct tty_driver *tty3215_driver;
107 * Get a request structure from the free list
109 static inline struct raw3215_req *raw3215_alloc_req(void)
111 struct raw3215_req *req;
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);
122 * Put a request structure back to the free list
124 static inline void raw3215_free_req(struct raw3215_req *req)
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);
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
143 static void raw3215_mk_read_req(struct raw3215_info *raw)
145 struct raw3215_req *req;
148 /* there can only be ONE read request at a time */
149 req = raw->queued_read;
151 /* no queued read request, use new req structure */
152 req = raw3215_alloc_req();
153 req->type = RAW3215_READ;
155 raw->queued_read = req;
159 ccw->cmd_code = 0x0A; /* read inquiry */
160 ccw->flags = 0x20; /* ignore incorrect length */
162 ccw->cda = (__u32) __pa(raw->inbuf);
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.
171 static void raw3215_mk_write_req(struct raw3215_info *raw)
173 struct raw3215_req *req;
175 int len, count, ix, lines;
177 if (raw->count <= raw->written)
179 /* check if there is a queued write request */
180 req = raw->queued_write;
182 /* no queued write request, use new req structure */
183 req = raw3215_alloc_req();
184 req->type = RAW3215_WRITE;
186 raw->queued_write = req;
188 raw->written -= req->len;
192 req->start = (raw->head - raw->count + raw->written) &
193 (RAW3215_BUFFER_SIZE - 1);
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
201 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
202 if (raw->buffer[ix] == 0x15)
204 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
206 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
207 if (len > RAW3215_MAX_BYTES)
208 len = RAW3215_MAX_BYTES;
212 /* set the indication if we should try to enlarge this request */
213 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
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. */
222 (__u32) __pa(raw->buffer + ix);
224 if (ix + count > RAW3215_BUFFER_SIZE)
225 count = RAW3215_BUFFER_SIZE - ix;
228 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
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.
237 ccw[-1].flags |= 0x40; /* use command chaining */
238 ccw->cmd_code = 0x03; /* NOP */
245 * Start a read or a write request
247 static void raw3215_start_io(struct raw3215_info *raw)
249 struct raw3215_req *req;
252 req = raw->queued_read;
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);
260 /* do_IO failed, put request back to queue */
261 raw->queued_read = req;
263 raw->flags |= RAW3215_WORKING;
266 req = raw->queued_write;
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);
274 /* do_IO failed, put request back to queue */
275 raw->queued_write = req;
277 raw->flags |= RAW3215_WORKING;
283 * Function to start a delayed output after RAW3215_TIMEOUT seconds
285 static void raw3215_timeout(unsigned long __data)
287 struct raw3215_info *raw = (struct raw3215_info *) __data;
290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
291 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;
303 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
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.
312 static inline void raw3215_try_io(struct raw3215_info *raw)
314 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
315 (raw->port.flags & ASYNC_SUSPENDED))
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);
326 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;
336 * Call tty_wakeup from tasklet context
338 static void raw3215_wakeup(unsigned long data)
340 struct raw3215_info *raw = (struct raw3215_info *) data;
341 struct tty_struct *tty;
343 tty = tty_port_tty_get(&raw->port);
351 * Try to start the next IO and wake up processes waiting on the tty.
353 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
355 raw3215_mk_write_req(raw);
357 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
358 tasklet_schedule(&raw->tlet);
362 * Interrupt routine, called from common io layer
364 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
367 struct raw3215_info *raw;
368 struct raw3215_req *req;
369 struct tty_struct *tty;
373 raw = dev_get_drvdata(&cdev->dev);
374 req = (struct raw3215_req *) intparm;
375 tty = tty_port_tty_get(&raw->port);
376 cstat = irb->scsw.cmd.cstat;
377 dstat = irb->scsw.cmd.dstat;
379 raw3215_next_io(raw, tty);
380 if (dstat & 0x01) { /* we got a unit exception */
381 dstat &= ~0x01; /* we can ignore it */
387 /* Attention interrupt, someone hit the enter key */
388 raw3215_mk_read_req(raw);
389 raw3215_next_io(raw, tty);
393 /* Channel end interrupt. */
394 if ((raw = req->info) == NULL)
395 goto put_tty; /* That shouldn't happen ... */
396 if (req->type == RAW3215_READ) {
397 /* store residual count, then wait for device end */
398 req->residual = irb->scsw.cmd.count;
403 /* Device end interrupt. */
404 if ((raw = req->info) == NULL)
405 goto put_tty; /* That shouldn't happen ... */
406 if (req->type == RAW3215_READ && tty != NULL) {
409 count = 160 - req->residual;
410 EBCASC(raw->inbuf, count);
411 cchar = ctrlchar_handle(raw->inbuf, count, tty);
412 switch (cchar & CTRLCHAR_MASK) {
417 tty_insert_flip_char(&raw->port, cchar,
419 tty_flip_buffer_push(&raw->port);
424 (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';
431 tty_insert_flip_string(&raw->port, raw->inbuf,
433 tty_flip_buffer_push(&raw->port);
436 } else if (req->type == RAW3215_WRITE) {
437 raw->count -= req->len;
438 raw->written -= req->len;
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);
448 raw3215_next_io(raw, tty);
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;
457 raw->flags &= ~RAW3215_WORKING;
458 raw3215_free_req(req);
460 raw3215_next_io(raw, tty);
467 * Drop the oldest line from the output buffer.
469 static void raw3215_drop_line(struct raw3215_info *raw)
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);
487 * Wait until length bytes are available int the output buffer.
488 * Has to be called with the s390irq lock held. Can be called
491 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
493 while (RAW3215_BUFFER_SIZE - raw->count < length) {
494 /* 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. */
497 if (raw->port.flags & ASYNC_SUSPENDED) {
498 raw3215_drop_line(raw);
501 /* there might be a request pending */
502 raw->flags |= RAW3215_FLUSHING;
503 raw3215_mk_write_req(raw);
505 raw->flags &= ~RAW3215_FLUSHING;
506 #ifdef CONFIG_TN3215_CONSOLE
507 ccw_device_wait_idle(raw->cdev);
509 /* Enough room freed up ? */
510 if (RAW3215_BUFFER_SIZE - raw->count >= length)
512 /* there might be another cpu waiting for the lock */
513 spin_unlock(get_ccwdev_lock(raw->cdev));
515 spin_lock(get_ccwdev_lock(raw->cdev));
520 * String write routine for 3215 devices
522 static void raw3215_write(struct raw3215_info *raw, const char *str,
529 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
530 count = (length > RAW3215_BUFFER_SIZE) ?
531 RAW3215_BUFFER_SIZE : length;
534 raw3215_make_room(raw, count);
536 /* copy string to output buffer and convert it to EBCDIC */
538 c = min_t(int, count,
539 min(RAW3215_BUFFER_SIZE - raw->count,
540 RAW3215_BUFFER_SIZE - raw->head));
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);
551 if (!(raw->flags & RAW3215_WORKING)) {
552 raw3215_mk_write_req(raw);
553 /* start or queue request */
556 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
561 * Put character routine for 3215 devices
563 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
566 unsigned int length, i;
568 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
570 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
571 raw->line_pos += length;
573 } else if (ch == '\n') {
580 raw3215_make_room(raw, length);
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);
587 if (!(raw->flags & RAW3215_WORKING)) {
588 raw3215_mk_write_req(raw);
589 /* start or queue request */
592 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
596 * Flush routine, it simply sets the flush flag and tries to start
599 static void raw3215_flush_buffer(struct raw3215_info *raw)
603 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
604 if (raw->count > 0) {
605 raw->flags |= RAW3215_FLUSHING;
607 raw->flags &= ~RAW3215_FLUSHING;
609 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
613 * Fire up a 3215 device.
615 static int raw3215_startup(struct raw3215_info *raw)
619 if (raw->port.flags & ASYNC_INITIALIZED)
622 raw->port.flags |= ASYNC_INITIALIZED;
623 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
625 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
631 * Shutdown a 3215 device.
633 static void raw3215_shutdown(struct raw3215_info *raw)
635 DECLARE_WAITQUEUE(wait, current);
638 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
639 (raw->flags & RAW3215_FIXED))
641 /* Wait for outstanding requests, then free irq */
642 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
643 if ((raw->flags & RAW3215_WORKING) ||
644 raw->queued_write != NULL ||
645 raw->queued_read != NULL) {
646 add_wait_queue(&raw->empty_wait, &wait);
647 set_current_state(TASK_INTERRUPTIBLE);
648 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
650 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
651 remove_wait_queue(&raw->empty_wait, &wait);
652 set_current_state(TASK_RUNNING);
653 raw->port.flags &= ~ASYNC_INITIALIZED;
655 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
658 static struct raw3215_info *raw3215_alloc_info(void)
660 struct raw3215_info *info;
662 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
666 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
667 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
668 if (!info->buffer || !info->inbuf) {
675 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
676 init_waitqueue_head(&info->empty_wait);
677 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
678 tty_port_init(&info->port);
683 static void raw3215_free_info(struct raw3215_info *raw)
687 tty_port_destroy(&raw->port);
691 static int raw3215_probe (struct ccw_device *cdev)
693 struct raw3215_info *raw;
696 /* Console is special. */
697 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
700 raw = raw3215_alloc_info();
705 dev_set_drvdata(&cdev->dev, raw);
706 cdev->handler = raw3215_irq;
708 spin_lock(&raw3215_device_lock);
709 for (line = 0; line < NR_3215; line++) {
710 if (!raw3215[line]) {
715 spin_unlock(&raw3215_device_lock);
716 if (line == NR_3215) {
717 raw3215_free_info(raw);
724 static void raw3215_remove (struct ccw_device *cdev)
726 struct raw3215_info *raw;
729 ccw_device_set_offline(cdev);
730 raw = dev_get_drvdata(&cdev->dev);
732 spin_lock(&raw3215_device_lock);
733 for (line = 0; line < NR_3215; line++)
734 if (raw3215[line] == raw)
736 raw3215[line] = NULL;
737 spin_unlock(&raw3215_device_lock);
738 dev_set_drvdata(&cdev->dev, NULL);
739 raw3215_free_info(raw);
743 static int raw3215_set_online (struct ccw_device *cdev)
745 struct raw3215_info *raw;
747 raw = dev_get_drvdata(&cdev->dev);
751 return raw3215_startup(raw);
754 static int raw3215_set_offline (struct ccw_device *cdev)
756 struct raw3215_info *raw;
758 raw = dev_get_drvdata(&cdev->dev);
762 raw3215_shutdown(raw);
767 static int raw3215_pm_stop(struct ccw_device *cdev)
769 struct raw3215_info *raw;
772 /* Empty the output buffer, then prevent new I/O. */
773 raw = dev_get_drvdata(&cdev->dev);
774 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
775 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
776 raw->port.flags |= ASYNC_SUSPENDED;
777 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
781 static int raw3215_pm_start(struct ccw_device *cdev)
783 struct raw3215_info *raw;
786 /* Allow I/O again and flush output buffer. */
787 raw = dev_get_drvdata(&cdev->dev);
788 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
789 raw->port.flags &= ~ASYNC_SUSPENDED;
790 raw->flags |= RAW3215_FLUSHING;
792 raw->flags &= ~RAW3215_FLUSHING;
793 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
797 static struct ccw_device_id raw3215_id[] = {
798 { CCW_DEVICE(0x3215, 0) },
799 { /* end of list */ },
802 static struct ccw_driver raw3215_ccw_driver = {
805 .owner = THIS_MODULE,
808 .probe = &raw3215_probe,
809 .remove = &raw3215_remove,
810 .set_online = &raw3215_set_online,
811 .set_offline = &raw3215_set_offline,
812 .freeze = &raw3215_pm_stop,
813 .thaw = &raw3215_pm_start,
814 .restore = &raw3215_pm_start,
815 .int_class = IRQIO_C15,
818 #ifdef CONFIG_TN3215_CONSOLE
820 * Write a string to the 3215 console
822 static void con3215_write(struct console *co, const char *str,
825 struct raw3215_info *raw;
830 raw = raw3215[0]; /* console 3215 is the first one */
832 for (i = 0; i < count; i++)
833 if (str[i] == '\t' || str[i] == '\n')
835 raw3215_write(raw, str, i);
839 raw3215_putchar(raw, *str);
846 static struct tty_driver *con3215_device(struct console *c, int *index)
849 return tty3215_driver;
853 * panic() calls con3215_flush through a panic_notifier
854 * before the system enters a disabled, endless loop.
856 static void con3215_flush(void)
858 struct raw3215_info *raw;
861 raw = raw3215[0]; /* console 3215 is the first one */
862 if (raw->port.flags & ASYNC_SUSPENDED)
863 /* The console is still frozen for suspend. */
864 if (ccw_device_force_console(raw->cdev))
865 /* Forcing didn't work, no panic message .. */
867 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
868 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
869 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
872 static int con3215_notify(struct notifier_block *self,
873 unsigned long event, void *data)
879 static struct notifier_block on_panic_nb = {
880 .notifier_call = con3215_notify,
884 static struct notifier_block on_reboot_nb = {
885 .notifier_call = con3215_notify,
890 * The console structure for the 3215 console
892 static struct console con3215 = {
894 .write = con3215_write,
895 .device = con3215_device,
896 .flags = CON_PRINTBUFFER,
900 * 3215 console initialization code called from console_init().
902 static int __init con3215_init(void)
904 struct ccw_device *cdev;
905 struct raw3215_info *raw;
906 struct raw3215_req *req;
909 /* Check if 3215 is to be the console */
910 if (!CONSOLE_IS_3215)
913 /* Set the console mode for VM */
915 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
916 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
919 /* allocate 3215 request structures */
920 raw3215_freelist = NULL;
921 spin_lock_init(&raw3215_freelist_lock);
922 for (i = 0; i < NR_3215_REQ; i++) {
923 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
926 req->next = raw3215_freelist;
927 raw3215_freelist = req;
930 cdev = ccw_device_create_console(&raw3215_ccw_driver);
934 raw3215[0] = raw = raw3215_alloc_info();
936 dev_set_drvdata(&cdev->dev, raw);
937 cdev->handler = raw3215_irq;
939 raw->flags |= RAW3215_FIXED;
940 if (ccw_device_enable_console(cdev)) {
941 ccw_device_destroy_console(cdev);
942 raw3215_free_info(raw);
947 /* Request the console irq */
948 if (raw3215_startup(raw) != 0) {
949 raw3215_free_info(raw);
953 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
954 register_reboot_notifier(&on_reboot_nb);
955 register_console(&con3215);
958 console_initcall(con3215_init);
961 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
963 struct raw3215_info *raw;
965 raw = raw3215[tty->index];
969 tty->driver_data = raw;
971 return tty_port_install(&raw->port, driver, tty);
977 * This routine is called whenever a 3215 tty is opened.
979 static int tty3215_open(struct tty_struct *tty, struct file * filp)
981 struct raw3215_info *raw = tty->driver_data;
984 tty_port_tty_set(&raw->port, tty);
986 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
988 * Start up 3215 device
990 retval = raw3215_startup(raw);
1000 * This routine is called when the 3215 tty is closed. We wait
1001 * for the remaining request to be completed. Then we clean up.
1003 static void tty3215_close(struct tty_struct *tty, struct file * filp)
1005 struct raw3215_info *raw;
1007 raw = (struct raw3215_info *) tty->driver_data;
1008 if (raw == NULL || tty->count > 1)
1011 /* Shutdown the terminal */
1012 raw3215_shutdown(raw);
1013 tasklet_kill(&raw->tlet);
1015 tty_port_tty_set(&raw->port, NULL);
1019 * Returns the amount of free space in the output buffer.
1021 static int tty3215_write_room(struct tty_struct *tty)
1023 struct raw3215_info *raw;
1025 raw = (struct raw3215_info *) tty->driver_data;
1027 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1028 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1029 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1035 * String write routine for 3215 ttys
1037 static int tty3215_write(struct tty_struct * tty,
1038 const unsigned char *buf, int count)
1040 struct raw3215_info *raw;
1045 raw = (struct raw3215_info *) tty->driver_data;
1048 for (i = 0; i < count; i++)
1049 if (buf[i] == '\t' || buf[i] == '\n')
1051 raw3215_write(raw, buf, i);
1055 raw3215_putchar(raw, *buf);
1064 * Put character routine for 3215 ttys
1066 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1068 struct raw3215_info *raw;
1072 raw = (struct raw3215_info *) tty->driver_data;
1073 raw3215_putchar(raw, ch);
1077 static void tty3215_flush_chars(struct tty_struct *tty)
1082 * Returns the number of characters in the output buffer
1084 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1086 struct raw3215_info *raw;
1088 raw = (struct raw3215_info *) tty->driver_data;
1092 static void tty3215_flush_buffer(struct tty_struct *tty)
1094 struct raw3215_info *raw;
1096 raw = (struct raw3215_info *) tty->driver_data;
1097 raw3215_flush_buffer(raw);
1102 * Disable reading from a 3215 tty
1104 static void tty3215_throttle(struct tty_struct * tty)
1106 struct raw3215_info *raw;
1108 raw = (struct raw3215_info *) tty->driver_data;
1109 raw->flags |= RAW3215_THROTTLED;
1113 * Enable reading from a 3215 tty
1115 static void tty3215_unthrottle(struct tty_struct * tty)
1117 struct raw3215_info *raw;
1118 unsigned long flags;
1120 raw = (struct raw3215_info *) tty->driver_data;
1121 if (raw->flags & RAW3215_THROTTLED) {
1122 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1123 raw->flags &= ~RAW3215_THROTTLED;
1124 raw3215_try_io(raw);
1125 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1130 * Disable writing to a 3215 tty
1132 static void tty3215_stop(struct tty_struct *tty)
1134 struct raw3215_info *raw;
1136 raw = (struct raw3215_info *) tty->driver_data;
1137 raw->flags |= RAW3215_STOPPED;
1141 * Enable writing to a 3215 tty
1143 static void tty3215_start(struct tty_struct *tty)
1145 struct raw3215_info *raw;
1146 unsigned long flags;
1148 raw = (struct raw3215_info *) tty->driver_data;
1149 if (raw->flags & RAW3215_STOPPED) {
1150 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1151 raw->flags &= ~RAW3215_STOPPED;
1152 raw3215_try_io(raw);
1153 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1157 static const struct tty_operations tty3215_ops = {
1158 .install = tty3215_install,
1159 .open = tty3215_open,
1160 .close = tty3215_close,
1161 .write = tty3215_write,
1162 .put_char = tty3215_put_char,
1163 .flush_chars = tty3215_flush_chars,
1164 .write_room = tty3215_write_room,
1165 .chars_in_buffer = tty3215_chars_in_buffer,
1166 .flush_buffer = tty3215_flush_buffer,
1167 .throttle = tty3215_throttle,
1168 .unthrottle = tty3215_unthrottle,
1169 .stop = tty3215_stop,
1170 .start = tty3215_start,
1174 * 3215 tty registration code called from tty_init().
1175 * Most kernel services (incl. kmalloc) are available at this poimt.
1177 static int __init tty3215_init(void)
1179 struct tty_driver *driver;
1182 if (!CONSOLE_IS_3215)
1185 driver = alloc_tty_driver(NR_3215);
1189 ret = ccw_driver_register(&raw3215_ccw_driver);
1191 put_tty_driver(driver);
1195 * Initialize the tty_driver structure
1196 * Entries in tty3215_driver that are NOT initialized:
1197 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1200 driver->driver_name = "tty3215";
1201 driver->name = "ttyS";
1202 driver->major = TTY_MAJOR;
1203 driver->minor_start = 64;
1204 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1205 driver->subtype = SYSTEM_TYPE_TTY;
1206 driver->init_termios = tty_std_termios;
1207 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1208 driver->init_termios.c_oflag = ONLCR;
1209 driver->init_termios.c_lflag = ISIG;
1210 driver->flags = TTY_DRIVER_REAL_RAW;
1211 tty_set_operations(driver, &tty3215_ops);
1212 ret = tty_register_driver(driver);
1214 put_tty_driver(driver);
1217 tty3215_driver = driver;
1221 static void __exit tty3215_exit(void)
1223 tty_unregister_driver(tty3215_driver);
1224 put_tty_driver(tty3215_driver);
1225 ccw_driver_unregister(&raw3215_ccw_driver);
1228 module_init(tty3215_init);
1229 module_exit(tty3215_exit);