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 if (raw->flags & RAW3215_TIMER_RUNS) {
292 del_timer(&raw->timer);
293 raw->flags &= ~RAW3215_TIMER_RUNS;
294 if (!(raw->port.flags & ASYNC_SUSPENDED)) {
295 raw3215_mk_write_req(raw);
296 raw3215_start_io(raw);
299 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
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.
308 static inline void raw3215_try_io(struct raw3215_info *raw)
310 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
311 (raw->port.flags & ASYNC_SUSPENDED))
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;
324 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
325 /* delay small writes */
326 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
327 add_timer(&raw->timer);
328 raw->flags |= RAW3215_TIMER_RUNS;
334 * Call tty_wakeup from tasklet context
336 static void raw3215_wakeup(unsigned long data)
338 struct raw3215_info *raw = (struct raw3215_info *) data;
339 struct tty_struct *tty;
341 tty = tty_port_tty_get(&raw->port);
349 * Try to start the next IO and wake up processes waiting on the tty.
351 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
353 raw3215_mk_write_req(raw);
355 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
356 tasklet_schedule(&raw->tlet);
360 * Interrupt routine, called from common io layer
362 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
365 struct raw3215_info *raw;
366 struct raw3215_req *req;
367 struct tty_struct *tty;
371 raw = dev_get_drvdata(&cdev->dev);
372 req = (struct raw3215_req *) intparm;
373 tty = tty_port_tty_get(&raw->port);
374 cstat = irb->scsw.cmd.cstat;
375 dstat = irb->scsw.cmd.dstat;
377 raw3215_next_io(raw, tty);
378 if (dstat & 0x01) { /* we got a unit exception */
379 dstat &= ~0x01; /* we can ignore it */
385 /* Attention interrupt, someone hit the enter key */
386 raw3215_mk_read_req(raw);
387 raw3215_next_io(raw, tty);
391 /* Channel end interrupt. */
392 if ((raw = req->info) == NULL)
393 goto put_tty; /* That shouldn't happen ... */
394 if (req->type == RAW3215_READ) {
395 /* store residual count, then wait for device end */
396 req->residual = irb->scsw.cmd.count;
401 /* Device end interrupt. */
402 if ((raw = req->info) == NULL)
403 goto put_tty; /* That shouldn't happen ... */
404 if (req->type == RAW3215_READ && tty != NULL) {
407 count = 160 - req->residual;
408 EBCASC(raw->inbuf, count);
409 cchar = ctrlchar_handle(raw->inbuf, count, tty);
410 switch (cchar & CTRLCHAR_MASK) {
415 tty_insert_flip_char(tty, cchar, TTY_NORMAL);
416 tty_flip_buffer_push(tty);
421 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
422 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
423 /* add the auto \n */
424 raw->inbuf[count] = '\n';
428 tty_insert_flip_string(tty, raw->inbuf, count);
429 tty_flip_buffer_push(tty);
432 } else if (req->type == RAW3215_WRITE) {
433 raw->count -= req->len;
434 raw->written -= req->len;
436 raw->flags &= ~RAW3215_WORKING;
437 raw3215_free_req(req);
438 /* check for empty wait */
439 if (waitqueue_active(&raw->empty_wait) &&
440 raw->queued_write == NULL &&
441 raw->queued_read == NULL) {
442 wake_up_interruptible(&raw->empty_wait);
444 raw3215_next_io(raw, tty);
447 /* Strange interrupt, I'll do my best to clean up */
448 if (req != NULL && req->type != RAW3215_FREE) {
449 if (req->type == RAW3215_WRITE) {
450 raw->count -= req->len;
451 raw->written -= req->len;
453 raw->flags &= ~RAW3215_WORKING;
454 raw3215_free_req(req);
456 raw3215_next_io(raw, tty);
463 * Drop the oldest line from the output buffer.
465 static void raw3215_drop_line(struct raw3215_info *raw)
470 BUG_ON(raw->written != 0);
471 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
472 while (raw->count > 0) {
473 ch = raw->buffer[ix];
474 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
483 * Wait until length bytes are available int the output buffer.
484 * Has to be called with the s390irq lock held. Can be called
487 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
489 while (RAW3215_BUFFER_SIZE - raw->count < length) {
490 /* While console is frozen for suspend we have no other
491 * choice but to drop message from the buffer to make
492 * room for even more messages. */
493 if (raw->port.flags & ASYNC_SUSPENDED) {
494 raw3215_drop_line(raw);
497 /* there might be a request pending */
498 raw->flags |= RAW3215_FLUSHING;
499 raw3215_mk_write_req(raw);
501 raw->flags &= ~RAW3215_FLUSHING;
502 #ifdef CONFIG_TN3215_CONSOLE
505 /* Enough room freed up ? */
506 if (RAW3215_BUFFER_SIZE - raw->count >= length)
508 /* there might be another cpu waiting for the lock */
509 spin_unlock(get_ccwdev_lock(raw->cdev));
511 spin_lock(get_ccwdev_lock(raw->cdev));
516 * String write routine for 3215 devices
518 static void raw3215_write(struct raw3215_info *raw, const char *str,
525 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
526 count = (length > RAW3215_BUFFER_SIZE) ?
527 RAW3215_BUFFER_SIZE : length;
530 raw3215_make_room(raw, count);
532 /* copy string to output buffer and convert it to EBCDIC */
534 c = min_t(int, count,
535 min(RAW3215_BUFFER_SIZE - raw->count,
536 RAW3215_BUFFER_SIZE - raw->head));
539 memcpy(raw->buffer + raw->head, str, c);
540 ASCEBC(raw->buffer + raw->head, c);
541 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
547 if (!(raw->flags & RAW3215_WORKING)) {
548 raw3215_mk_write_req(raw);
549 /* start or queue request */
552 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
557 * Put character routine for 3215 devices
559 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
562 unsigned int length, i;
564 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
566 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
567 raw->line_pos += length;
569 } else if (ch == '\n') {
576 raw3215_make_room(raw, length);
578 for (i = 0; i < length; i++) {
579 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
580 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
583 if (!(raw->flags & RAW3215_WORKING)) {
584 raw3215_mk_write_req(raw);
585 /* start or queue request */
588 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
592 * Flush routine, it simply sets the flush flag and tries to start
595 static void raw3215_flush_buffer(struct raw3215_info *raw)
599 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
600 if (raw->count > 0) {
601 raw->flags |= RAW3215_FLUSHING;
603 raw->flags &= ~RAW3215_FLUSHING;
605 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
609 * Fire up a 3215 device.
611 static int raw3215_startup(struct raw3215_info *raw)
615 if (raw->port.flags & ASYNC_INITIALIZED)
618 raw->port.flags |= ASYNC_INITIALIZED;
619 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
621 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
627 * Shutdown a 3215 device.
629 static void raw3215_shutdown(struct raw3215_info *raw)
631 DECLARE_WAITQUEUE(wait, current);
634 if (!(raw->port.flags & ASYNC_INITIALIZED) ||
635 (raw->flags & RAW3215_FIXED))
637 /* Wait for outstanding requests, then free irq */
638 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
639 if ((raw->flags & RAW3215_WORKING) ||
640 raw->queued_write != NULL ||
641 raw->queued_read != NULL) {
642 raw->port.flags |= ASYNC_CLOSING;
643 add_wait_queue(&raw->empty_wait, &wait);
644 set_current_state(TASK_INTERRUPTIBLE);
645 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
647 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
648 remove_wait_queue(&raw->empty_wait, &wait);
649 set_current_state(TASK_RUNNING);
650 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
652 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
655 static struct raw3215_info *raw3215_alloc_info(void)
657 struct raw3215_info *info;
659 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
663 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
664 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
665 if (!info->buffer || !info->inbuf) {
670 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
671 init_waitqueue_head(&info->empty_wait);
672 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
673 tty_port_init(&info->port);
678 static void raw3215_free_info(struct raw3215_info *raw)
682 tty_port_destroy(&raw->port);
686 static int raw3215_probe (struct ccw_device *cdev)
688 struct raw3215_info *raw;
691 /* Console is special. */
692 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
695 raw = raw3215_alloc_info();
700 dev_set_drvdata(&cdev->dev, raw);
701 cdev->handler = raw3215_irq;
703 spin_lock(&raw3215_device_lock);
704 for (line = 0; line < NR_3215; line++) {
705 if (!raw3215[line]) {
710 spin_unlock(&raw3215_device_lock);
711 if (line == NR_3215) {
712 raw3215_free_info(raw);
719 static void raw3215_remove (struct ccw_device *cdev)
721 struct raw3215_info *raw;
724 ccw_device_set_offline(cdev);
725 raw = dev_get_drvdata(&cdev->dev);
727 spin_lock(&raw3215_device_lock);
728 for (line = 0; line < NR_3215; line++)
729 if (raw3215[line] == raw)
731 raw3215[line] = NULL;
732 spin_unlock(&raw3215_device_lock);
733 dev_set_drvdata(&cdev->dev, NULL);
734 raw3215_free_info(raw);
738 static int raw3215_set_online (struct ccw_device *cdev)
740 struct raw3215_info *raw;
742 raw = dev_get_drvdata(&cdev->dev);
746 return raw3215_startup(raw);
749 static int raw3215_set_offline (struct ccw_device *cdev)
751 struct raw3215_info *raw;
753 raw = dev_get_drvdata(&cdev->dev);
757 raw3215_shutdown(raw);
762 static int raw3215_pm_stop(struct ccw_device *cdev)
764 struct raw3215_info *raw;
767 /* Empty the output buffer, then prevent new I/O. */
768 raw = dev_get_drvdata(&cdev->dev);
769 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
770 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
771 raw->port.flags |= ASYNC_SUSPENDED;
772 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
776 static int raw3215_pm_start(struct ccw_device *cdev)
778 struct raw3215_info *raw;
781 /* Allow I/O again and flush output buffer. */
782 raw = dev_get_drvdata(&cdev->dev);
783 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
784 raw->port.flags &= ~ASYNC_SUSPENDED;
785 raw->flags |= RAW3215_FLUSHING;
787 raw->flags &= ~RAW3215_FLUSHING;
788 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
792 static struct ccw_device_id raw3215_id[] = {
793 { CCW_DEVICE(0x3215, 0) },
794 { /* end of list */ },
797 static struct ccw_driver raw3215_ccw_driver = {
800 .owner = THIS_MODULE,
803 .probe = &raw3215_probe,
804 .remove = &raw3215_remove,
805 .set_online = &raw3215_set_online,
806 .set_offline = &raw3215_set_offline,
807 .freeze = &raw3215_pm_stop,
808 .thaw = &raw3215_pm_start,
809 .restore = &raw3215_pm_start,
810 .int_class = IRQIO_C15,
813 #ifdef CONFIG_TN3215_CONSOLE
815 * Write a string to the 3215 console
817 static void con3215_write(struct console *co, const char *str,
820 struct raw3215_info *raw;
825 raw = raw3215[0]; /* console 3215 is the first one */
827 for (i = 0; i < count; i++)
828 if (str[i] == '\t' || str[i] == '\n')
830 raw3215_write(raw, str, i);
834 raw3215_putchar(raw, *str);
841 static struct tty_driver *con3215_device(struct console *c, int *index)
844 return tty3215_driver;
848 * panic() calls con3215_flush through a panic_notifier
849 * before the system enters a disabled, endless loop.
851 static void con3215_flush(void)
853 struct raw3215_info *raw;
856 raw = raw3215[0]; /* console 3215 is the first one */
857 if (raw->port.flags & ASYNC_SUSPENDED)
858 /* The console is still frozen for suspend. */
859 if (ccw_device_force_console())
860 /* Forcing didn't work, no panic message .. */
862 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
863 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
864 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
867 static int con3215_notify(struct notifier_block *self,
868 unsigned long event, void *data)
874 static struct notifier_block on_panic_nb = {
875 .notifier_call = con3215_notify,
879 static struct notifier_block on_reboot_nb = {
880 .notifier_call = con3215_notify,
885 * The console structure for the 3215 console
887 static struct console con3215 = {
889 .write = con3215_write,
890 .device = con3215_device,
891 .flags = CON_PRINTBUFFER,
895 * 3215 console initialization code called from console_init().
897 static int __init con3215_init(void)
899 struct ccw_device *cdev;
900 struct raw3215_info *raw;
901 struct raw3215_req *req;
904 /* Check if 3215 is to be the console */
905 if (!CONSOLE_IS_3215)
908 /* Set the console mode for VM */
910 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
911 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
914 /* allocate 3215 request structures */
915 raw3215_freelist = NULL;
916 spin_lock_init(&raw3215_freelist_lock);
917 for (i = 0; i < NR_3215_REQ; i++) {
918 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
919 req->next = raw3215_freelist;
920 raw3215_freelist = req;
923 cdev = ccw_device_probe_console();
927 raw3215[0] = raw = raw3215_alloc_info();
929 dev_set_drvdata(&cdev->dev, raw);
930 cdev->handler = raw3215_irq;
932 raw->flags |= RAW3215_FIXED;
934 /* Request the console irq */
935 if (raw3215_startup(raw) != 0) {
936 raw3215_free_info(raw);
940 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
941 register_reboot_notifier(&on_reboot_nb);
942 register_console(&con3215);
945 console_initcall(con3215_init);
948 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
950 struct raw3215_info *raw;
952 raw = raw3215[tty->index];
956 tty->driver_data = raw;
958 return tty_port_install(&raw->port, driver, tty);
964 * This routine is called whenever a 3215 tty is opened.
966 static int tty3215_open(struct tty_struct *tty, struct file * filp)
968 struct raw3215_info *raw = tty->driver_data;
971 tty_port_tty_set(&raw->port, tty);
973 tty->low_latency = 0; /* don't use bottom half for pushing chars */
975 * Start up 3215 device
977 retval = raw3215_startup(raw);
987 * This routine is called when the 3215 tty is closed. We wait
988 * for the remaining request to be completed. Then we clean up.
990 static void tty3215_close(struct tty_struct *tty, struct file * filp)
992 struct raw3215_info *raw;
994 raw = (struct raw3215_info *) tty->driver_data;
995 if (raw == NULL || tty->count > 1)
998 /* Shutdown the terminal */
999 raw3215_shutdown(raw);
1000 tasklet_kill(&raw->tlet);
1002 tty_port_tty_set(&raw->port, NULL);
1006 * Returns the amount of free space in the output buffer.
1008 static int tty3215_write_room(struct tty_struct *tty)
1010 struct raw3215_info *raw;
1012 raw = (struct raw3215_info *) tty->driver_data;
1014 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1015 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1016 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1022 * String write routine for 3215 ttys
1024 static int tty3215_write(struct tty_struct * tty,
1025 const unsigned char *buf, int count)
1027 struct raw3215_info *raw;
1031 raw = (struct raw3215_info *) tty->driver_data;
1032 raw3215_write(raw, buf, count);
1037 * Put character routine for 3215 ttys
1039 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1041 struct raw3215_info *raw;
1045 raw = (struct raw3215_info *) tty->driver_data;
1046 raw3215_putchar(raw, ch);
1050 static void tty3215_flush_chars(struct tty_struct *tty)
1055 * Returns the number of characters in the output buffer
1057 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1059 struct raw3215_info *raw;
1061 raw = (struct raw3215_info *) tty->driver_data;
1065 static void tty3215_flush_buffer(struct tty_struct *tty)
1067 struct raw3215_info *raw;
1069 raw = (struct raw3215_info *) tty->driver_data;
1070 raw3215_flush_buffer(raw);
1075 * Disable reading from a 3215 tty
1077 static void tty3215_throttle(struct tty_struct * tty)
1079 struct raw3215_info *raw;
1081 raw = (struct raw3215_info *) tty->driver_data;
1082 raw->flags |= RAW3215_THROTTLED;
1086 * Enable reading from a 3215 tty
1088 static void tty3215_unthrottle(struct tty_struct * tty)
1090 struct raw3215_info *raw;
1091 unsigned long flags;
1093 raw = (struct raw3215_info *) tty->driver_data;
1094 if (raw->flags & RAW3215_THROTTLED) {
1095 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1096 raw->flags &= ~RAW3215_THROTTLED;
1097 raw3215_try_io(raw);
1098 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1103 * Disable writing to a 3215 tty
1105 static void tty3215_stop(struct tty_struct *tty)
1107 struct raw3215_info *raw;
1109 raw = (struct raw3215_info *) tty->driver_data;
1110 raw->flags |= RAW3215_STOPPED;
1114 * Enable writing to a 3215 tty
1116 static void tty3215_start(struct tty_struct *tty)
1118 struct raw3215_info *raw;
1119 unsigned long flags;
1121 raw = (struct raw3215_info *) tty->driver_data;
1122 if (raw->flags & RAW3215_STOPPED) {
1123 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1124 raw->flags &= ~RAW3215_STOPPED;
1125 raw3215_try_io(raw);
1126 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1130 static const struct tty_operations tty3215_ops = {
1131 .install = tty3215_install,
1132 .open = tty3215_open,
1133 .close = tty3215_close,
1134 .write = tty3215_write,
1135 .put_char = tty3215_put_char,
1136 .flush_chars = tty3215_flush_chars,
1137 .write_room = tty3215_write_room,
1138 .chars_in_buffer = tty3215_chars_in_buffer,
1139 .flush_buffer = tty3215_flush_buffer,
1140 .throttle = tty3215_throttle,
1141 .unthrottle = tty3215_unthrottle,
1142 .stop = tty3215_stop,
1143 .start = tty3215_start,
1147 * 3215 tty registration code called from tty_init().
1148 * Most kernel services (incl. kmalloc) are available at this poimt.
1150 static int __init tty3215_init(void)
1152 struct tty_driver *driver;
1155 if (!CONSOLE_IS_3215)
1158 driver = alloc_tty_driver(NR_3215);
1162 ret = ccw_driver_register(&raw3215_ccw_driver);
1164 put_tty_driver(driver);
1168 * Initialize the tty_driver structure
1169 * Entries in tty3215_driver that are NOT initialized:
1170 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1173 driver->driver_name = "tty3215";
1174 driver->name = "ttyS";
1175 driver->major = TTY_MAJOR;
1176 driver->minor_start = 64;
1177 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1178 driver->subtype = SYSTEM_TYPE_TTY;
1179 driver->init_termios = tty_std_termios;
1180 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1181 driver->init_termios.c_oflag = ONLCR | XTABS;
1182 driver->init_termios.c_lflag = ISIG;
1183 driver->flags = TTY_DRIVER_REAL_RAW;
1184 tty_set_operations(driver, &tty3215_ops);
1185 ret = tty_register_driver(driver);
1187 put_tty_driver(driver);
1190 tty3215_driver = driver;
1194 static void __exit tty3215_exit(void)
1196 tty_unregister_driver(tty3215_driver);
1197 put_tty_driver(tty3215_driver);
1198 ccw_driver_unregister(&raw3215_ccw_driver);
1201 module_init(tty3215_init);
1202 module_exit(tty3215_exit);