1 // SPDX-License-Identifier: GPL-2.0
3 * 3215 line mode terminal driver.
5 * Copyright IBM Corp. 1999, 2009
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
9 * Aug-2000: Added tab support
10 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
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/panic_notifier.h>
23 #include <linux/reboot.h>
24 #include <linux/serial.h> /* ASYNC_* flags */
25 #include <linux/slab.h>
26 #include <asm/ccwdev.h>
29 #include <asm/ebcdic.h>
30 #include <linux/uaccess.h>
31 #include <asm/delay.h>
32 #include <asm/cpcmd.h>
33 #include <asm/setup.h>
38 #define NR_3215_REQ (4*NR_3215)
39 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
40 #define RAW3215_INBUF_SIZE 256 /* input buffer size */
41 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
42 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
43 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
44 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
45 #define RAW3215_NR_CCWS 3
46 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
48 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */
49 #define RAW3215_WORKING 4 /* set if a request is being worked on */
50 #define RAW3215_THROTTLED 8 /* set if reading is disabled */
51 #define RAW3215_STOPPED 16 /* set if writing is disabled */
52 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
53 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
55 #define TAB_STOP_SIZE 8 /* tab stop size */
58 * Request types for a 3215 device
61 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
65 * Request structure for a 3215 device
68 enum raw3215_type type; /* type of the request */
69 int start, len; /* start index & len in output buffer */
70 int delayable; /* indication to wait for more data */
71 int residual; /* residual count for read request */
72 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
73 struct raw3215_info *info; /* pointer to main structure */
74 struct raw3215_req *next; /* pointer to next request */
75 } __attribute__ ((aligned(8)));
79 struct ccw_device *cdev; /* device for tty driver */
80 spinlock_t *lock; /* pointer to irq lock */
81 int flags; /* state flags */
82 char *buffer; /* pointer to output buffer */
83 char *inbuf; /* pointer to input buffer */
84 int head; /* first free byte in output buffer */
85 int count; /* number of bytes in output buffer */
86 int written; /* number of bytes in write requests */
87 struct raw3215_req *queued_read; /* pointer to queued read requests */
88 struct raw3215_req *queued_write;/* pointer to queued write requests */
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 DEFINE_SPINLOCK(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(struct timer_list *t)
287 struct raw3215_info *raw = from_timer(raw, t, timer);
290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
291 raw->flags &= ~RAW3215_TIMER_RUNS;
292 raw3215_mk_write_req(raw);
293 raw3215_start_io(raw);
294 if ((raw->queued_read || raw->queued_write) &&
295 !(raw->flags & RAW3215_WORKING) &&
296 !(raw->flags & RAW3215_TIMER_RUNS)) {
297 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
298 add_timer(&raw->timer);
299 raw->flags |= RAW3215_TIMER_RUNS;
301 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
305 * Function to conditionally start an IO. A read is started immediately,
306 * a write is only started immediately if the flush flag is on or the
307 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
308 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
310 static inline void raw3215_try_io(struct raw3215_info *raw)
312 if (!tty_port_initialized(&raw->port))
314 if (raw->queued_read != NULL)
315 raw3215_start_io(raw);
316 else if (raw->queued_write != NULL) {
317 if ((raw->queued_write->delayable == 0) ||
318 (raw->flags & RAW3215_FLUSHING)) {
319 /* execute write requests bigger than minimum size */
320 raw3215_start_io(raw);
323 if ((raw->queued_read || raw->queued_write) &&
324 !(raw->flags & RAW3215_WORKING) &&
325 !(raw->flags & RAW3215_TIMER_RUNS)) {
326 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
327 add_timer(&raw->timer);
328 raw->flags |= RAW3215_TIMER_RUNS;
333 * Try to start the next IO and wake up processes waiting on the tty.
335 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
337 raw3215_mk_write_req(raw);
339 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
344 * Interrupt routine, called from common io layer
346 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
349 struct raw3215_info *raw;
350 struct raw3215_req *req;
351 struct tty_struct *tty;
355 raw = dev_get_drvdata(&cdev->dev);
356 req = (struct raw3215_req *) intparm;
357 tty = tty_port_tty_get(&raw->port);
358 cstat = irb->scsw.cmd.cstat;
359 dstat = irb->scsw.cmd.dstat;
361 raw3215_next_io(raw, tty);
362 if (dstat & 0x01) { /* we got a unit exception */
363 dstat &= ~0x01; /* we can ignore it */
369 /* Attention interrupt, someone hit the enter key */
370 raw3215_mk_read_req(raw);
371 raw3215_next_io(raw, tty);
375 /* Channel end interrupt. */
376 if ((raw = req->info) == NULL)
377 goto put_tty; /* That shouldn't happen ... */
378 if (req->type == RAW3215_READ) {
379 /* store residual count, then wait for device end */
380 req->residual = irb->scsw.cmd.count;
386 /* Device end interrupt. */
387 if ((raw = req->info) == NULL)
388 goto put_tty; /* That shouldn't happen ... */
389 if (req->type == RAW3215_READ && tty != NULL) {
392 count = 160 - req->residual;
393 EBCASC(raw->inbuf, count);
394 cchar = ctrlchar_handle(raw->inbuf, count, tty);
395 switch (cchar & CTRLCHAR_MASK) {
400 tty_insert_flip_char(&raw->port, cchar,
402 tty_flip_buffer_push(&raw->port);
407 (strncmp(raw->inbuf+count-2, "\252n", 2) &&
408 strncmp(raw->inbuf+count-2, "^n", 2)) ) {
409 /* add the auto \n */
410 raw->inbuf[count] = '\n';
414 tty_insert_flip_string(&raw->port, raw->inbuf,
416 tty_flip_buffer_push(&raw->port);
419 } else if (req->type == RAW3215_WRITE) {
420 raw->count -= req->len;
421 raw->written -= req->len;
423 raw->flags &= ~RAW3215_WORKING;
424 raw3215_free_req(req);
425 /* check for empty wait */
426 if (waitqueue_active(&raw->empty_wait) &&
427 raw->queued_write == NULL &&
428 raw->queued_read == NULL) {
429 wake_up_interruptible(&raw->empty_wait);
431 raw3215_next_io(raw, tty);
434 /* Strange interrupt, I'll do my best to clean up */
435 if (req != NULL && req->type != RAW3215_FREE) {
436 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);
443 raw3215_next_io(raw, tty);
450 * Wait until length bytes are available int the output buffer.
451 * Has to be called with the s390irq lock held. Can be called
454 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
456 while (RAW3215_BUFFER_SIZE - raw->count < length) {
457 /* there might be a request pending */
458 raw->flags |= RAW3215_FLUSHING;
459 raw3215_mk_write_req(raw);
461 raw->flags &= ~RAW3215_FLUSHING;
462 #ifdef CONFIG_TN3215_CONSOLE
463 ccw_device_wait_idle(raw->cdev);
465 /* Enough room freed up ? */
466 if (RAW3215_BUFFER_SIZE - raw->count >= length)
468 /* there might be another cpu waiting for the lock */
469 spin_unlock(get_ccwdev_lock(raw->cdev));
471 spin_lock(get_ccwdev_lock(raw->cdev));
476 * String write routine for 3215 devices
478 static void raw3215_write(struct raw3215_info *raw, const char *str,
485 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
486 count = (length > RAW3215_BUFFER_SIZE) ?
487 RAW3215_BUFFER_SIZE : length;
490 raw3215_make_room(raw, count);
492 /* copy string to output buffer and convert it to EBCDIC */
494 c = min_t(int, count,
495 min(RAW3215_BUFFER_SIZE - raw->count,
496 RAW3215_BUFFER_SIZE - raw->head));
499 memcpy(raw->buffer + raw->head, str, c);
500 ASCEBC(raw->buffer + raw->head, c);
501 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
507 if (!(raw->flags & RAW3215_WORKING)) {
508 raw3215_mk_write_req(raw);
509 /* start or queue request */
512 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
517 * Put character routine for 3215 devices
519 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
522 unsigned int length, i;
524 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
526 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
527 raw->line_pos += length;
529 } else if (ch == '\n') {
536 raw3215_make_room(raw, length);
538 for (i = 0; i < length; i++) {
539 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
540 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
543 if (!(raw->flags & RAW3215_WORKING)) {
544 raw3215_mk_write_req(raw);
545 /* start or queue request */
548 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
552 * Flush routine, it simply sets the flush flag and tries to start
555 static void raw3215_flush_buffer(struct raw3215_info *raw)
559 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
560 if (raw->count > 0) {
561 raw->flags |= RAW3215_FLUSHING;
563 raw->flags &= ~RAW3215_FLUSHING;
565 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
569 * Fire up a 3215 device.
571 static int raw3215_startup(struct raw3215_info *raw)
575 if (tty_port_initialized(&raw->port))
578 tty_port_set_initialized(&raw->port, 1);
579 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
581 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
587 * Shutdown a 3215 device.
589 static void raw3215_shutdown(struct raw3215_info *raw)
591 DECLARE_WAITQUEUE(wait, current);
594 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))
596 /* Wait for outstanding requests, then free irq */
597 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
598 if ((raw->flags & RAW3215_WORKING) ||
599 raw->queued_write != NULL ||
600 raw->queued_read != NULL) {
601 add_wait_queue(&raw->empty_wait, &wait);
602 set_current_state(TASK_INTERRUPTIBLE);
603 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
605 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
606 remove_wait_queue(&raw->empty_wait, &wait);
607 set_current_state(TASK_RUNNING);
608 tty_port_set_initialized(&raw->port, 1);
610 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
613 static struct raw3215_info *raw3215_alloc_info(void)
615 struct raw3215_info *info;
617 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
621 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
622 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
623 if (!info->buffer || !info->inbuf) {
630 timer_setup(&info->timer, raw3215_timeout, 0);
631 init_waitqueue_head(&info->empty_wait);
632 tty_port_init(&info->port);
637 static void raw3215_free_info(struct raw3215_info *raw)
641 tty_port_destroy(&raw->port);
645 static int raw3215_probe (struct ccw_device *cdev)
647 struct raw3215_info *raw;
650 /* Console is special. */
651 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
654 raw = raw3215_alloc_info();
659 dev_set_drvdata(&cdev->dev, raw);
660 cdev->handler = raw3215_irq;
662 spin_lock(&raw3215_device_lock);
663 for (line = 0; line < NR_3215; line++) {
664 if (!raw3215[line]) {
669 spin_unlock(&raw3215_device_lock);
670 if (line == NR_3215) {
671 raw3215_free_info(raw);
678 static void raw3215_remove (struct ccw_device *cdev)
680 struct raw3215_info *raw;
683 ccw_device_set_offline(cdev);
684 raw = dev_get_drvdata(&cdev->dev);
686 spin_lock(&raw3215_device_lock);
687 for (line = 0; line < NR_3215; line++)
688 if (raw3215[line] == raw)
690 raw3215[line] = NULL;
691 spin_unlock(&raw3215_device_lock);
692 dev_set_drvdata(&cdev->dev, NULL);
693 raw3215_free_info(raw);
697 static int raw3215_set_online (struct ccw_device *cdev)
699 struct raw3215_info *raw;
701 raw = dev_get_drvdata(&cdev->dev);
705 return raw3215_startup(raw);
708 static int raw3215_set_offline (struct ccw_device *cdev)
710 struct raw3215_info *raw;
712 raw = dev_get_drvdata(&cdev->dev);
716 raw3215_shutdown(raw);
721 static struct ccw_device_id raw3215_id[] = {
722 { CCW_DEVICE(0x3215, 0) },
723 { /* end of list */ },
726 static struct ccw_driver raw3215_ccw_driver = {
729 .owner = THIS_MODULE,
732 .probe = &raw3215_probe,
733 .remove = &raw3215_remove,
734 .set_online = &raw3215_set_online,
735 .set_offline = &raw3215_set_offline,
736 .int_class = IRQIO_C15,
739 #ifdef CONFIG_TN3215_CONSOLE
741 * Write a string to the 3215 console
743 static void con3215_write(struct console *co, const char *str,
746 struct raw3215_info *raw;
751 raw = raw3215[0]; /* console 3215 is the first one */
753 for (i = 0; i < count; i++)
754 if (str[i] == '\t' || str[i] == '\n')
756 raw3215_write(raw, str, i);
760 raw3215_putchar(raw, *str);
767 static struct tty_driver *con3215_device(struct console *c, int *index)
770 return tty3215_driver;
774 * The below function is called as a panic/reboot notifier before the
775 * system enters a disabled, endless loop.
777 * Notice we must use the spin_trylock() alternative, to prevent lockups
778 * in atomic context (panic routine runs with secondary CPUs, local IRQs
779 * and preemption disabled).
781 static int con3215_notify(struct notifier_block *self,
782 unsigned long event, void *data)
784 struct raw3215_info *raw;
787 raw = raw3215[0]; /* console 3215 is the first one */
788 if (!spin_trylock_irqsave(get_ccwdev_lock(raw->cdev), flags))
790 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
791 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
796 static struct notifier_block on_panic_nb = {
797 .notifier_call = con3215_notify,
798 .priority = INT_MIN + 1, /* run the callback late */
801 static struct notifier_block on_reboot_nb = {
802 .notifier_call = con3215_notify,
803 .priority = INT_MIN + 1, /* run the callback late */
807 * The console structure for the 3215 console
809 static struct console con3215 = {
811 .write = con3215_write,
812 .device = con3215_device,
813 .flags = CON_PRINTBUFFER,
817 * 3215 console initialization code called from console_init().
819 static int __init con3215_init(void)
821 struct ccw_device *cdev;
822 struct raw3215_info *raw;
823 struct raw3215_req *req;
826 /* Check if 3215 is to be the console */
827 if (!CONSOLE_IS_3215)
830 /* Set the console mode for VM */
832 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
833 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
836 /* allocate 3215 request structures */
837 raw3215_freelist = NULL;
838 for (i = 0; i < NR_3215_REQ; i++) {
839 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
842 req->next = raw3215_freelist;
843 raw3215_freelist = req;
846 cdev = ccw_device_create_console(&raw3215_ccw_driver);
850 raw3215[0] = raw = raw3215_alloc_info();
852 dev_set_drvdata(&cdev->dev, raw);
853 cdev->handler = raw3215_irq;
855 raw->flags |= RAW3215_FIXED;
856 if (ccw_device_enable_console(cdev)) {
857 ccw_device_destroy_console(cdev);
858 raw3215_free_info(raw);
863 /* Request the console irq */
864 if (raw3215_startup(raw) != 0) {
865 raw3215_free_info(raw);
869 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
870 register_reboot_notifier(&on_reboot_nb);
871 register_console(&con3215);
874 console_initcall(con3215_init);
877 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
879 struct raw3215_info *raw;
881 raw = raw3215[tty->index];
885 tty->driver_data = raw;
887 return tty_port_install(&raw->port, driver, tty);
893 * This routine is called whenever a 3215 tty is opened.
895 static int tty3215_open(struct tty_struct *tty, struct file * filp)
897 struct raw3215_info *raw = tty->driver_data;
899 tty_port_tty_set(&raw->port, tty);
902 * Start up 3215 device
904 return raw3215_startup(raw);
910 * This routine is called when the 3215 tty is closed. We wait
911 * for the remaining request to be completed. Then we clean up.
913 static void tty3215_close(struct tty_struct *tty, struct file * filp)
915 struct raw3215_info *raw = tty->driver_data;
917 if (raw == NULL || tty->count > 1)
920 /* Shutdown the terminal */
921 raw3215_shutdown(raw);
923 tty_port_tty_set(&raw->port, NULL);
927 * Returns the amount of free space in the output buffer.
929 static unsigned int tty3215_write_room(struct tty_struct *tty)
931 struct raw3215_info *raw = tty->driver_data;
933 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
934 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
935 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
941 * String write routine for 3215 ttys
943 static int tty3215_write(struct tty_struct * tty,
944 const unsigned char *buf, int count)
946 struct raw3215_info *raw = tty->driver_data;
951 for (i = 0; i < count; i++)
952 if (buf[i] == '\t' || buf[i] == '\n')
954 raw3215_write(raw, buf, i);
958 raw3215_putchar(raw, *buf);
967 * Put character routine for 3215 ttys
969 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
971 struct raw3215_info *raw = tty->driver_data;
973 raw3215_putchar(raw, ch);
978 static void tty3215_flush_chars(struct tty_struct *tty)
983 * Returns the number of characters in the output buffer
985 static unsigned int tty3215_chars_in_buffer(struct tty_struct *tty)
987 struct raw3215_info *raw = tty->driver_data;
992 static void tty3215_flush_buffer(struct tty_struct *tty)
994 struct raw3215_info *raw = tty->driver_data;
996 raw3215_flush_buffer(raw);
1001 * Disable reading from a 3215 tty
1003 static void tty3215_throttle(struct tty_struct * tty)
1005 struct raw3215_info *raw = tty->driver_data;
1007 raw->flags |= RAW3215_THROTTLED;
1011 * Enable reading from a 3215 tty
1013 static void tty3215_unthrottle(struct tty_struct * tty)
1015 struct raw3215_info *raw = tty->driver_data;
1016 unsigned long flags;
1018 if (raw->flags & RAW3215_THROTTLED) {
1019 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1020 raw->flags &= ~RAW3215_THROTTLED;
1021 raw3215_try_io(raw);
1022 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1027 * Disable writing to a 3215 tty
1029 static void tty3215_stop(struct tty_struct *tty)
1031 struct raw3215_info *raw = tty->driver_data;
1033 raw->flags |= RAW3215_STOPPED;
1037 * Enable writing to a 3215 tty
1039 static void tty3215_start(struct tty_struct *tty)
1041 struct raw3215_info *raw = tty->driver_data;
1042 unsigned long flags;
1044 if (raw->flags & RAW3215_STOPPED) {
1045 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1046 raw->flags &= ~RAW3215_STOPPED;
1047 raw3215_try_io(raw);
1048 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1052 static const struct tty_operations tty3215_ops = {
1053 .install = tty3215_install,
1054 .open = tty3215_open,
1055 .close = tty3215_close,
1056 .write = tty3215_write,
1057 .put_char = tty3215_put_char,
1058 .flush_chars = tty3215_flush_chars,
1059 .write_room = tty3215_write_room,
1060 .chars_in_buffer = tty3215_chars_in_buffer,
1061 .flush_buffer = tty3215_flush_buffer,
1062 .throttle = tty3215_throttle,
1063 .unthrottle = tty3215_unthrottle,
1064 .stop = tty3215_stop,
1065 .start = tty3215_start,
1069 * 3215 tty registration code called from tty_init().
1070 * Most kernel services (incl. kmalloc) are available at this poimt.
1072 static int __init tty3215_init(void)
1074 struct tty_driver *driver;
1077 if (!CONSOLE_IS_3215)
1080 driver = tty_alloc_driver(NR_3215, TTY_DRIVER_REAL_RAW);
1082 return PTR_ERR(driver);
1084 ret = ccw_driver_register(&raw3215_ccw_driver);
1086 tty_driver_kref_put(driver);
1090 * Initialize the tty_driver structure
1091 * Entries in tty3215_driver that are NOT initialized:
1092 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1095 driver->driver_name = "tty3215";
1096 driver->name = "ttyS";
1097 driver->major = TTY_MAJOR;
1098 driver->minor_start = 64;
1099 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1100 driver->subtype = SYSTEM_TYPE_TTY;
1101 driver->init_termios = tty_std_termios;
1102 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1103 driver->init_termios.c_oflag = ONLCR;
1104 driver->init_termios.c_lflag = ISIG;
1105 tty_set_operations(driver, &tty3215_ops);
1106 ret = tty_register_driver(driver);
1108 tty_driver_kref_put(driver);
1111 tty3215_driver = driver;
1114 device_initcall(tty3215_init);