2 * drivers/s390/char/con3215.c
3 * 3215 line mode terminal driver.
6 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
10 * Aug-2000: Added tab support
11 * Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu)
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>
25 #include <linux/slab.h>
26 #include <linux/bootmem.h>
28 #include <asm/ccwdev.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>
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 */
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) */
59 #define TAB_STOP_SIZE 8 /* tab stop size */
62 * Request types for a 3215 device
65 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
69 * Request structure for a 3215 device
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)));
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 */
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;
112 static struct tty_driver *tty3215_driver;
115 * Get a request structure from the free list
117 static inline struct raw3215_req *
118 raw3215_alloc_req(void) {
119 struct raw3215_req *req;
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);
130 * Put a request structure back to the free list
133 raw3215_free_req(struct raw3215_req *req) {
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);
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
152 raw3215_mk_read_req(struct raw3215_info *raw)
154 struct raw3215_req *req;
157 /* there can only be ONE read request at a time */
158 req = raw->queued_read;
160 /* no queued read request, use new req structure */
161 req = raw3215_alloc_req();
162 req->type = RAW3215_READ;
164 raw->queued_read = req;
168 ccw->cmd_code = 0x0A; /* read inquiry */
169 ccw->flags = 0x20; /* ignore incorrect length */
171 ccw->cda = (__u32) __pa(raw->inbuf);
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.
181 raw3215_mk_write_req(struct raw3215_info *raw)
183 struct raw3215_req *req;
185 int len, count, ix, lines;
187 if (raw->count <= raw->written)
189 /* check if there is a queued write request */
190 req = raw->queued_write;
192 /* no queued write request, use new req structure */
193 req = raw3215_alloc_req();
194 req->type = RAW3215_WRITE;
196 raw->queued_write = req;
198 raw->written -= req->len;
202 req->start = (raw->head - raw->count + raw->written) &
203 (RAW3215_BUFFER_SIZE - 1);
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
211 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
212 if (raw->buffer[ix] == 0x15)
214 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
216 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
217 if (len > RAW3215_MAX_BYTES)
218 len = RAW3215_MAX_BYTES;
222 /* set the indication if we should try to enlarge this request */
223 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
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. */
232 (__u32) __pa(raw->buffer + ix);
234 if (ix + count > RAW3215_BUFFER_SIZE)
235 count = RAW3215_BUFFER_SIZE - ix;
238 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
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.
247 ccw[-1].flags |= 0x40; /* use command chaining */
248 ccw->cmd_code = 0x03; /* NOP */
255 * Start a read or a write request
258 raw3215_start_io(struct raw3215_info *raw)
260 struct raw3215_req *req;
263 req = raw->queued_read;
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);
271 /* do_IO failed, put request back to queue */
272 raw->queued_read = req;
274 raw->flags |= RAW3215_WORKING;
277 req = raw->queued_write;
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);
285 /* do_IO failed, put request back to queue */
286 raw->queued_write = req;
288 raw->flags |= RAW3215_WORKING;
294 * Function to start a delayed output after RAW3215_TIMEOUT seconds
297 raw3215_timeout(unsigned long __data)
299 struct raw3215_info *raw = (struct raw3215_info *) __data;
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);
309 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
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.
319 raw3215_try_io(struct raw3215_info *raw)
321 if (!(raw->flags & RAW3215_ACTIVE))
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;
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;
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.
351 raw3215_tasklet(void *data)
353 struct raw3215_info *raw;
354 struct tty_struct *tty;
357 raw = (struct raw3215_info *) data;
358 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
359 raw3215_mk_write_req(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);
369 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
375 * Interrupt routine, called from common io layer
378 raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
380 struct raw3215_info *raw;
381 struct raw3215_req *req;
382 struct tty_struct *tty;
386 raw = cdev->dev.driver_data;
387 req = (struct raw3215_req *) intparm;
388 cstat = irb->scsw.cstat;
389 dstat = irb->scsw.dstat;
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);
398 if (dstat & 0x01) { /* we got a unit exception */
399 dstat &= ~0x01; /* we can ignore it */
405 /* Attention interrupt, someone hit the enter key */
406 raw3215_mk_read_req(raw);
408 memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
409 tasklet_schedule(&raw->tasklet);
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;
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) {
430 count = 160 - req->residual;
431 if (MACHINE_IS_P390) {
432 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE);
436 EBCASC(raw->inbuf, count);
437 cchar = ctrlchar_handle(raw->inbuf, count, tty);
438 switch (cchar & CTRLCHAR_MASK) {
443 tty_insert_flip_char(tty, cchar, TTY_NORMAL);
444 tty_flip_buffer_push(raw->tty);
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';
456 tty_insert_flip_string(tty, raw->inbuf, count);
457 tty_flip_buffer_push(raw->tty);
460 } else if (req->type == RAW3215_WRITE) {
461 raw->count -= req->len;
462 raw->written -= req->len;
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);
472 tasklet_schedule(&raw->tasklet);
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;
481 raw->flags &= ~RAW3215_WORKING;
482 raw3215_free_req(req);
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);
495 * Wait until length bytes are available int the output buffer.
496 * Has to be called with the s390irq lock held. Can be called
500 raw3215_make_room(struct raw3215_info *raw, unsigned int length)
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);
507 raw->flags &= ~RAW3215_FLUSHING;
508 #ifdef CONFIG_TN3215_CONSOLE
511 /* Enough room freed up ? */
512 if (RAW3215_BUFFER_SIZE - raw->count >= length)
514 /* there might be another cpu waiting for the lock */
515 spin_unlock(get_ccwdev_lock(raw->cdev));
517 spin_lock(get_ccwdev_lock(raw->cdev));
522 * String write routine for 3215 devices
525 raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length)
531 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
532 count = (length > RAW3215_BUFFER_SIZE) ?
533 RAW3215_BUFFER_SIZE : length;
536 raw3215_make_room(raw, count);
538 /* copy string to output buffer and convert it to EBCDIC */
540 c = min_t(int, count,
541 min(RAW3215_BUFFER_SIZE - raw->count,
542 RAW3215_BUFFER_SIZE - raw->head));
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);
553 if (!(raw->flags & RAW3215_WORKING)) {
554 raw3215_mk_write_req(raw);
555 /* start or queue request */
558 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
563 * Put character routine for 3215 devices
566 raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
569 unsigned int length, i;
571 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
573 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
574 raw->line_pos += length;
576 } else if (ch == '\n') {
583 raw3215_make_room(raw, length);
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);
590 if (!(raw->flags & RAW3215_WORKING)) {
591 raw3215_mk_write_req(raw);
592 /* start or queue request */
595 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
599 * Flush routine, it simply sets the flush flag and tries to start
603 raw3215_flush_buffer(struct raw3215_info *raw)
607 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
608 if (raw->count > 0) {
609 raw->flags |= RAW3215_FLUSHING;
611 raw->flags &= ~RAW3215_FLUSHING;
613 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
617 * Fire up a 3215 device.
620 raw3215_startup(struct raw3215_info *raw)
624 if (raw->flags & RAW3215_ACTIVE)
627 raw->flags |= RAW3215_ACTIVE;
628 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
630 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
636 * Shutdown a 3215 device.
639 raw3215_shutdown(struct raw3215_info *raw)
641 DECLARE_WAITQUEUE(wait, current);
644 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
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);
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);
661 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
665 raw3215_probe (struct ccw_device *cdev)
667 struct raw3215_info *raw;
670 /* Console is special. */
671 if (raw3215[0] && (cdev->dev.driver_data == raw3215[0]))
673 raw = kmalloc(sizeof(struct raw3215_info) +
674 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
678 spin_lock(&raw3215_device_lock);
679 for (line = 0; line < NR_3215; line++) {
680 if (!raw3215[line]) {
685 spin_unlock(&raw3215_device_lock);
686 if (line == NR_3215) {
692 raw->inbuf = (char *) raw + sizeof(struct raw3215_info);
693 memset(raw, 0, sizeof(struct raw3215_info));
694 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE,
696 if (raw->buffer == NULL) {
697 spin_lock(&raw3215_device_lock);
698 raw3215[line] = NULL;
699 spin_unlock(&raw3215_device_lock);
703 tasklet_init(&raw->tasklet,
704 (void (*)(unsigned long)) raw3215_tasklet,
705 (unsigned long) raw);
706 init_waitqueue_head(&raw->empty_wait);
708 cdev->dev.driver_data = raw;
709 cdev->handler = raw3215_irq;
715 raw3215_remove (struct ccw_device *cdev)
717 struct raw3215_info *raw;
719 ccw_device_set_offline(cdev);
720 raw = cdev->dev.driver_data;
722 cdev->dev.driver_data = NULL;
729 raw3215_set_online (struct ccw_device *cdev)
731 struct raw3215_info *raw;
733 raw = cdev->dev.driver_data;
737 return raw3215_startup(raw);
741 raw3215_set_offline (struct ccw_device *cdev)
743 struct raw3215_info *raw;
745 raw = cdev->dev.driver_data;
749 raw3215_shutdown(raw);
754 static struct ccw_device_id raw3215_id[] = {
755 { CCW_DEVICE(0x3215, 0) },
756 { /* end of list */ },
759 static struct ccw_driver raw3215_ccw_driver = {
761 .owner = THIS_MODULE,
763 .probe = &raw3215_probe,
764 .remove = &raw3215_remove,
765 .set_online = &raw3215_set_online,
766 .set_offline = &raw3215_set_offline,
769 #ifdef CONFIG_TN3215_CONSOLE
771 * Write a string to the 3215 console
774 con3215_write(struct console *co, const char *str, unsigned int count)
776 struct raw3215_info *raw;
781 raw = raw3215[0]; /* console 3215 is the first one */
783 for (i = 0; i < count; i++)
784 if (str[i] == '\t' || str[i] == '\n')
786 raw3215_write(raw, str, i);
790 raw3215_putchar(raw, *str);
797 static struct tty_driver *con3215_device(struct console *c, int *index)
800 return tty3215_driver;
804 * panic() calls console_unblank before the system enters a
805 * disabled, endless loop.
808 con3215_unblank(void)
810 struct raw3215_info *raw;
813 raw = raw3215[0]; /* console 3215 is the first one */
814 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
815 raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
816 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
820 * The console structure for the 3215 console
822 static struct console con3215 = {
824 .write = con3215_write,
825 .device = con3215_device,
826 .unblank = con3215_unblank,
827 .flags = CON_PRINTBUFFER,
831 * 3215 console initialization code called from console_init().
832 * NOTE: This is called before kmalloc is available.
837 struct ccw_device *cdev;
838 struct raw3215_info *raw;
839 struct raw3215_req *req;
842 /* Check if 3215 is to be the console */
843 if (!CONSOLE_IS_3215)
846 /* Set the console mode for VM */
848 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
849 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
852 /* allocate 3215 request structures */
853 raw3215_freelist = NULL;
854 spin_lock_init(&raw3215_freelist_lock);
855 for (i = 0; i < NR_3215_REQ; i++) {
856 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req));
857 req->next = raw3215_freelist;
858 raw3215_freelist = req;
861 cdev = ccw_device_probe_console();
865 raw3215[0] = raw = (struct raw3215_info *)
866 alloc_bootmem_low(sizeof(struct raw3215_info));
867 memset(raw, 0, sizeof(struct raw3215_info));
868 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
869 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
871 cdev->dev.driver_data = raw;
872 cdev->handler = raw3215_irq;
874 raw->flags |= RAW3215_FIXED;
875 tasklet_init(&raw->tasklet,
876 (void (*)(unsigned long)) raw3215_tasklet,
877 (unsigned long) raw);
878 init_waitqueue_head(&raw->empty_wait);
880 /* Request the console irq */
881 if (raw3215_startup(raw) != 0) {
882 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
883 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
884 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info));
886 printk("Couldn't find a 3215 console device\n");
889 register_console(&con3215);
892 console_initcall(con3215_init);
898 * This routine is called whenever a 3215 tty is opened.
901 tty3215_open(struct tty_struct *tty, struct file * filp)
903 struct raw3215_info *raw;
907 if ((line < 0) || (line >= NR_3215))
914 tty->driver_data = raw;
917 tty->low_latency = 0; /* don't use bottom half for pushing chars */
919 * Start up 3215 device
921 retval = raw3215_startup(raw);
931 * This routine is called when the 3215 tty is closed. We wait
932 * for the remaining request to be completed. Then we clean up.
935 tty3215_close(struct tty_struct *tty, struct file * filp)
937 struct raw3215_info *raw;
939 raw = (struct raw3215_info *) tty->driver_data;
940 if (raw == NULL || tty->count > 1)
943 /* Shutdown the terminal */
944 raw3215_shutdown(raw);
950 * Returns the amount of free space in the output buffer.
953 tty3215_write_room(struct tty_struct *tty)
955 struct raw3215_info *raw;
957 raw = (struct raw3215_info *) tty->driver_data;
959 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
960 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
961 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
967 * String write routine for 3215 ttys
970 tty3215_write(struct tty_struct * tty,
971 const unsigned char *buf, int count)
973 struct raw3215_info *raw;
977 raw = (struct raw3215_info *) tty->driver_data;
978 raw3215_write(raw, buf, count);
983 * Put character routine for 3215 ttys
986 tty3215_put_char(struct tty_struct *tty, unsigned char ch)
988 struct raw3215_info *raw;
992 raw = (struct raw3215_info *) tty->driver_data;
993 raw3215_putchar(raw, ch);
998 tty3215_flush_chars(struct tty_struct *tty)
1003 * Returns the number of characters in the output buffer
1006 tty3215_chars_in_buffer(struct tty_struct *tty)
1008 struct raw3215_info *raw;
1010 raw = (struct raw3215_info *) tty->driver_data;
1015 tty3215_flush_buffer(struct tty_struct *tty)
1017 struct raw3215_info *raw;
1019 raw = (struct raw3215_info *) tty->driver_data;
1020 raw3215_flush_buffer(raw);
1025 * Currently we don't have any io controls for 3215 ttys
1028 tty3215_ioctl(struct tty_struct *tty, struct file * file,
1029 unsigned int cmd, unsigned long arg)
1031 if (tty->flags & (1 << TTY_IO_ERROR))
1036 return -ENOIOCTLCMD;
1042 * Disable reading from a 3215 tty
1045 tty3215_throttle(struct tty_struct * tty)
1047 struct raw3215_info *raw;
1049 raw = (struct raw3215_info *) tty->driver_data;
1050 raw->flags |= RAW3215_THROTTLED;
1054 * Enable reading from a 3215 tty
1057 tty3215_unthrottle(struct tty_struct * tty)
1059 struct raw3215_info *raw;
1060 unsigned long flags;
1062 raw = (struct raw3215_info *) tty->driver_data;
1063 if (raw->flags & RAW3215_THROTTLED) {
1064 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1065 raw->flags &= ~RAW3215_THROTTLED;
1066 raw3215_try_io(raw);
1067 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1072 * Disable writing to a 3215 tty
1075 tty3215_stop(struct tty_struct *tty)
1077 struct raw3215_info *raw;
1079 raw = (struct raw3215_info *) tty->driver_data;
1080 raw->flags |= RAW3215_STOPPED;
1084 * Enable writing to a 3215 tty
1087 tty3215_start(struct tty_struct *tty)
1089 struct raw3215_info *raw;
1090 unsigned long flags;
1092 raw = (struct raw3215_info *) tty->driver_data;
1093 if (raw->flags & RAW3215_STOPPED) {
1094 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1095 raw->flags &= ~RAW3215_STOPPED;
1096 raw3215_try_io(raw);
1097 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1101 static const struct tty_operations tty3215_ops = {
1102 .open = tty3215_open,
1103 .close = tty3215_close,
1104 .write = tty3215_write,
1105 .put_char = tty3215_put_char,
1106 .flush_chars = tty3215_flush_chars,
1107 .write_room = tty3215_write_room,
1108 .chars_in_buffer = tty3215_chars_in_buffer,
1109 .flush_buffer = tty3215_flush_buffer,
1110 .ioctl = tty3215_ioctl,
1111 .throttle = tty3215_throttle,
1112 .unthrottle = tty3215_unthrottle,
1113 .stop = tty3215_stop,
1114 .start = tty3215_start,
1118 * 3215 tty registration code called from tty_init().
1119 * Most kernel services (incl. kmalloc) are available at this poimt.
1124 struct tty_driver *driver;
1127 if (!CONSOLE_IS_3215)
1130 driver = alloc_tty_driver(NR_3215);
1134 ret = ccw_driver_register(&raw3215_ccw_driver);
1136 put_tty_driver(driver);
1140 * Initialize the tty_driver structure
1141 * Entries in tty3215_driver that are NOT initialized:
1142 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1145 driver->owner = THIS_MODULE;
1146 driver->driver_name = "tty3215";
1147 driver->name = "ttyS";
1148 driver->major = TTY_MAJOR;
1149 driver->minor_start = 64;
1150 driver->type = TTY_DRIVER_TYPE_SYSTEM;
1151 driver->subtype = SYSTEM_TYPE_TTY;
1152 driver->init_termios = tty_std_termios;
1153 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1154 driver->init_termios.c_oflag = ONLCR | XTABS;
1155 driver->init_termios.c_lflag = ISIG;
1156 driver->flags = TTY_DRIVER_REAL_RAW;
1157 tty_set_operations(driver, &tty3215_ops);
1158 ret = tty_register_driver(driver);
1160 printk("Couldn't register tty3215 driver\n");
1161 put_tty_driver(driver);
1164 tty3215_driver = driver;
1171 tty_unregister_driver(tty3215_driver);
1172 put_tty_driver(tty3215_driver);
1173 ccw_driver_unregister(&raw3215_ccw_driver);
1176 module_init(tty3215_init);
1177 module_exit(tty3215_exit);