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_WORKING 4 /* set if a request is being worked on */
48 #define RAW3215_THROTTLED 8 /* set if reading is disabled */
49 #define RAW3215_STOPPED 16 /* set if writing is disabled */
50 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
51 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
53 #define TAB_STOP_SIZE 8 /* tab stop size */
56 * Request types for a 3215 device
59 RAW3215_FREE
, RAW3215_READ
, RAW3215_WRITE
63 * Request structure for a 3215 device
66 enum raw3215_type type
; /* type of the request */
67 int start
, len
; /* start index & len in output buffer */
68 int delayable
; /* indication to wait for more data */
69 int residual
; /* residual count for read request */
70 struct ccw1 ccws
[RAW3215_NR_CCWS
]; /* space for the channel program */
71 struct raw3215_info
*info
; /* pointer to main structure */
72 struct raw3215_req
*next
; /* pointer to next request */
73 } __attribute__ ((aligned(8)));
77 struct ccw_device
*cdev
; /* device for tty driver */
78 spinlock_t
*lock
; /* pointer to irq lock */
79 int flags
; /* state flags */
80 char *buffer
; /* pointer to output buffer */
81 char *inbuf
; /* pointer to input buffer */
82 int head
; /* first free byte in output buffer */
83 int count
; /* number of bytes in output buffer */
84 int written
; /* number of bytes in write requests */
85 struct raw3215_req
*queued_read
; /* pointer to queued read requests */
86 struct raw3215_req
*queued_write
;/* pointer to queued write requests */
87 struct tasklet_struct tlet
; /* tasklet to invoke tty_wakeup */
88 wait_queue_head_t empty_wait
; /* wait queue for flushing */
89 struct timer_list timer
; /* timer for delayed output */
90 int line_pos
; /* position on the line (for tabs) */
91 char ubuffer
[80]; /* copy_from_user buffer */
94 /* array of 3215 devices structures */
95 static struct raw3215_info
*raw3215
[NR_3215
];
96 /* spinlock to protect the raw3215 array */
97 static DEFINE_SPINLOCK(raw3215_device_lock
);
98 /* list of free request structures */
99 static struct raw3215_req
*raw3215_freelist
;
100 /* spinlock to protect free list */
101 static spinlock_t raw3215_freelist_lock
;
103 static struct tty_driver
*tty3215_driver
;
106 * Get a request structure from the free list
108 static inline struct raw3215_req
*raw3215_alloc_req(void)
110 struct raw3215_req
*req
;
113 spin_lock_irqsave(&raw3215_freelist_lock
, flags
);
114 req
= raw3215_freelist
;
115 raw3215_freelist
= req
->next
;
116 spin_unlock_irqrestore(&raw3215_freelist_lock
, flags
);
121 * Put a request structure back to the free list
123 static inline void raw3215_free_req(struct raw3215_req
*req
)
127 if (req
->type
== RAW3215_FREE
)
128 return; /* don't free a free request */
129 req
->type
= RAW3215_FREE
;
130 spin_lock_irqsave(&raw3215_freelist_lock
, flags
);
131 req
->next
= raw3215_freelist
;
132 raw3215_freelist
= req
;
133 spin_unlock_irqrestore(&raw3215_freelist_lock
, flags
);
137 * Set up a read request that reads up to 160 byte from the 3215 device.
138 * If there is a queued read request it is used, but that shouldn't happen
139 * because a 3215 terminal won't accept a new read before the old one is
142 static void raw3215_mk_read_req(struct raw3215_info
*raw
)
144 struct raw3215_req
*req
;
147 /* there can only be ONE read request at a time */
148 req
= raw
->queued_read
;
150 /* no queued read request, use new req structure */
151 req
= raw3215_alloc_req();
152 req
->type
= RAW3215_READ
;
154 raw
->queued_read
= req
;
158 ccw
->cmd_code
= 0x0A; /* read inquiry */
159 ccw
->flags
= 0x20; /* ignore incorrect length */
161 ccw
->cda
= (__u32
) __pa(raw
->inbuf
);
165 * Set up a write request with the information from the main structure.
166 * A ccw chain is created that writes as much as possible from the output
167 * buffer to the 3215 device. If a queued write exists it is replaced by
168 * the new, probably lengthened request.
170 static void raw3215_mk_write_req(struct raw3215_info
*raw
)
172 struct raw3215_req
*req
;
174 int len
, count
, ix
, lines
;
176 if (raw
->count
<= raw
->written
)
178 /* check if there is a queued write request */
179 req
= raw
->queued_write
;
181 /* no queued write request, use new req structure */
182 req
= raw3215_alloc_req();
183 req
->type
= RAW3215_WRITE
;
185 raw
->queued_write
= req
;
187 raw
->written
-= req
->len
;
191 req
->start
= (raw
->head
- raw
->count
+ raw
->written
) &
192 (RAW3215_BUFFER_SIZE
- 1);
194 * now we have to count newlines. We can at max accept
195 * RAW3215_MAX_NEWLINE newlines in a single ssch due to
196 * a restriction in VM
200 while (lines
< RAW3215_MAX_NEWLINE
&& ix
!= raw
->head
) {
201 if (raw
->buffer
[ix
] == 0x15)
203 ix
= (ix
+ 1) & (RAW3215_BUFFER_SIZE
- 1);
205 len
= ((ix
- 1 - req
->start
) & (RAW3215_BUFFER_SIZE
- 1)) + 1;
206 if (len
> RAW3215_MAX_BYTES
)
207 len
= RAW3215_MAX_BYTES
;
211 /* set the indication if we should try to enlarge this request */
212 req
->delayable
= (ix
== raw
->head
) && (len
< RAW3215_MIN_WRITE
);
217 ccw
[-1].flags
|= 0x40; /* use command chaining */
218 ccw
->cmd_code
= 0x01; /* write, auto carrier return */
219 ccw
->flags
= 0x20; /* ignore incorrect length ind. */
221 (__u32
) __pa(raw
->buffer
+ ix
);
223 if (ix
+ count
> RAW3215_BUFFER_SIZE
)
224 count
= RAW3215_BUFFER_SIZE
- ix
;
227 ix
= (ix
+ count
) & (RAW3215_BUFFER_SIZE
- 1);
231 * Add a NOP to the channel program. 3215 devices are purely
232 * emulated and its much better to avoid the channel end
233 * interrupt in this case.
236 ccw
[-1].flags
|= 0x40; /* use command chaining */
237 ccw
->cmd_code
= 0x03; /* NOP */
244 * Start a read or a write request
246 static void raw3215_start_io(struct raw3215_info
*raw
)
248 struct raw3215_req
*req
;
251 req
= raw
->queued_read
;
253 !(raw
->flags
& (RAW3215_WORKING
| RAW3215_THROTTLED
))) {
254 /* dequeue request */
255 raw
->queued_read
= NULL
;
256 res
= ccw_device_start(raw
->cdev
, req
->ccws
,
257 (unsigned long) req
, 0, 0);
259 /* do_IO failed, put request back to queue */
260 raw
->queued_read
= req
;
262 raw
->flags
|= RAW3215_WORKING
;
265 req
= raw
->queued_write
;
267 !(raw
->flags
& (RAW3215_WORKING
| RAW3215_STOPPED
))) {
268 /* dequeue request */
269 raw
->queued_write
= NULL
;
270 res
= ccw_device_start(raw
->cdev
, req
->ccws
,
271 (unsigned long) req
, 0, 0);
273 /* do_IO failed, put request back to queue */
274 raw
->queued_write
= req
;
276 raw
->flags
|= RAW3215_WORKING
;
282 * Function to start a delayed output after RAW3215_TIMEOUT seconds
284 static void raw3215_timeout(unsigned long __data
)
286 struct raw3215_info
*raw
= (struct raw3215_info
*) __data
;
289 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
290 if (raw
->flags
& RAW3215_TIMER_RUNS
) {
291 del_timer(&raw
->timer
);
292 raw
->flags
&= ~RAW3215_TIMER_RUNS
;
293 if (!(raw
->port
.flags
& ASYNC_SUSPENDED
)) {
294 raw3215_mk_write_req(raw
);
295 raw3215_start_io(raw
);
298 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
302 * Function to conditionally start an IO. A read is started immediately,
303 * a write is only started immediately if the flush flag is on or the
304 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
305 * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
307 static inline void raw3215_try_io(struct raw3215_info
*raw
)
309 if (!(raw
->port
.flags
& ASYNC_INITIALIZED
) ||
310 (raw
->port
.flags
& ASYNC_SUSPENDED
))
312 if (raw
->queued_read
!= NULL
)
313 raw3215_start_io(raw
);
314 else if (raw
->queued_write
!= NULL
) {
315 if ((raw
->queued_write
->delayable
== 0) ||
316 (raw
->flags
& RAW3215_FLUSHING
)) {
317 /* execute write requests bigger than minimum size */
318 raw3215_start_io(raw
);
319 if (raw
->flags
& RAW3215_TIMER_RUNS
) {
320 del_timer(&raw
->timer
);
321 raw
->flags
&= ~RAW3215_TIMER_RUNS
;
323 } else if (!(raw
->flags
& RAW3215_TIMER_RUNS
)) {
324 /* delay small writes */
325 raw
->timer
.expires
= RAW3215_TIMEOUT
+ jiffies
;
326 add_timer(&raw
->timer
);
327 raw
->flags
|= RAW3215_TIMER_RUNS
;
333 * Call tty_wakeup from tasklet context
335 static void raw3215_wakeup(unsigned long data
)
337 struct raw3215_info
*raw
= (struct raw3215_info
*) data
;
338 struct tty_struct
*tty
;
340 tty
= tty_port_tty_get(&raw
->port
);
348 * Try to start the next IO and wake up processes waiting on the tty.
350 static void raw3215_next_io(struct raw3215_info
*raw
, struct tty_struct
*tty
)
352 raw3215_mk_write_req(raw
);
354 if (tty
&& RAW3215_BUFFER_SIZE
- raw
->count
>= RAW3215_MIN_SPACE
)
355 tasklet_schedule(&raw
->tlet
);
359 * Interrupt routine, called from common io layer
361 static void raw3215_irq(struct ccw_device
*cdev
, unsigned long intparm
,
364 struct raw3215_info
*raw
;
365 struct raw3215_req
*req
;
366 struct tty_struct
*tty
;
370 raw
= dev_get_drvdata(&cdev
->dev
);
371 req
= (struct raw3215_req
*) intparm
;
372 tty
= tty_port_tty_get(&raw
->port
);
373 cstat
= irb
->scsw
.cmd
.cstat
;
374 dstat
= irb
->scsw
.cmd
.dstat
;
376 raw3215_next_io(raw
, tty
);
377 if (dstat
& 0x01) { /* we got a unit exception */
378 dstat
&= ~0x01; /* we can ignore it */
384 /* Attention interrupt, someone hit the enter key */
385 raw3215_mk_read_req(raw
);
386 raw3215_next_io(raw
, tty
);
390 /* Channel end interrupt. */
391 if ((raw
= req
->info
) == NULL
)
392 goto put_tty
; /* That shouldn't happen ... */
393 if (req
->type
== RAW3215_READ
) {
394 /* store residual count, then wait for device end */
395 req
->residual
= irb
->scsw
.cmd
.count
;
400 /* Device end interrupt. */
401 if ((raw
= req
->info
) == NULL
)
402 goto put_tty
; /* That shouldn't happen ... */
403 if (req
->type
== RAW3215_READ
&& tty
!= NULL
) {
406 count
= 160 - req
->residual
;
407 EBCASC(raw
->inbuf
, count
);
408 cchar
= ctrlchar_handle(raw
->inbuf
, count
, tty
);
409 switch (cchar
& CTRLCHAR_MASK
) {
414 tty_insert_flip_char(&raw
->port
, cchar
,
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(&raw
->port
, raw
->inbuf
,
430 tty_flip_buffer_push(tty
);
433 } else if (req
->type
== RAW3215_WRITE
) {
434 raw
->count
-= req
->len
;
435 raw
->written
-= req
->len
;
437 raw
->flags
&= ~RAW3215_WORKING
;
438 raw3215_free_req(req
);
439 /* check for empty wait */
440 if (waitqueue_active(&raw
->empty_wait
) &&
441 raw
->queued_write
== NULL
&&
442 raw
->queued_read
== NULL
) {
443 wake_up_interruptible(&raw
->empty_wait
);
445 raw3215_next_io(raw
, tty
);
448 /* Strange interrupt, I'll do my best to clean up */
449 if (req
!= NULL
&& req
->type
!= RAW3215_FREE
) {
450 if (req
->type
== RAW3215_WRITE
) {
451 raw
->count
-= req
->len
;
452 raw
->written
-= req
->len
;
454 raw
->flags
&= ~RAW3215_WORKING
;
455 raw3215_free_req(req
);
457 raw3215_next_io(raw
, tty
);
464 * Drop the oldest line from the output buffer.
466 static void raw3215_drop_line(struct raw3215_info
*raw
)
471 BUG_ON(raw
->written
!= 0);
472 ix
= (raw
->head
- raw
->count
) & (RAW3215_BUFFER_SIZE
- 1);
473 while (raw
->count
> 0) {
474 ch
= raw
->buffer
[ix
];
475 ix
= (ix
+ 1) & (RAW3215_BUFFER_SIZE
- 1);
484 * Wait until length bytes are available int the output buffer.
485 * Has to be called with the s390irq lock held. Can be called
488 static void raw3215_make_room(struct raw3215_info
*raw
, unsigned int length
)
490 while (RAW3215_BUFFER_SIZE
- raw
->count
< length
) {
491 /* While console is frozen for suspend we have no other
492 * choice but to drop message from the buffer to make
493 * room for even more messages. */
494 if (raw
->port
.flags
& ASYNC_SUSPENDED
) {
495 raw3215_drop_line(raw
);
498 /* there might be a request pending */
499 raw
->flags
|= RAW3215_FLUSHING
;
500 raw3215_mk_write_req(raw
);
502 raw
->flags
&= ~RAW3215_FLUSHING
;
503 #ifdef CONFIG_TN3215_CONSOLE
506 /* Enough room freed up ? */
507 if (RAW3215_BUFFER_SIZE
- raw
->count
>= length
)
509 /* there might be another cpu waiting for the lock */
510 spin_unlock(get_ccwdev_lock(raw
->cdev
));
512 spin_lock(get_ccwdev_lock(raw
->cdev
));
517 * String write routine for 3215 devices
519 static void raw3215_write(struct raw3215_info
*raw
, const char *str
,
526 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
527 count
= (length
> RAW3215_BUFFER_SIZE
) ?
528 RAW3215_BUFFER_SIZE
: length
;
531 raw3215_make_room(raw
, count
);
533 /* copy string to output buffer and convert it to EBCDIC */
535 c
= min_t(int, count
,
536 min(RAW3215_BUFFER_SIZE
- raw
->count
,
537 RAW3215_BUFFER_SIZE
- raw
->head
));
540 memcpy(raw
->buffer
+ raw
->head
, str
, c
);
541 ASCEBC(raw
->buffer
+ raw
->head
, c
);
542 raw
->head
= (raw
->head
+ c
) & (RAW3215_BUFFER_SIZE
- 1);
548 if (!(raw
->flags
& RAW3215_WORKING
)) {
549 raw3215_mk_write_req(raw
);
550 /* start or queue request */
553 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
558 * Put character routine for 3215 devices
560 static void raw3215_putchar(struct raw3215_info
*raw
, unsigned char ch
)
563 unsigned int length
, i
;
565 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
567 length
= TAB_STOP_SIZE
- (raw
->line_pos
%TAB_STOP_SIZE
);
568 raw
->line_pos
+= length
;
570 } else if (ch
== '\n') {
577 raw3215_make_room(raw
, length
);
579 for (i
= 0; i
< length
; i
++) {
580 raw
->buffer
[raw
->head
] = (char) _ascebc
[(int) ch
];
581 raw
->head
= (raw
->head
+ 1) & (RAW3215_BUFFER_SIZE
- 1);
584 if (!(raw
->flags
& RAW3215_WORKING
)) {
585 raw3215_mk_write_req(raw
);
586 /* start or queue request */
589 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
593 * Flush routine, it simply sets the flush flag and tries to start
596 static void raw3215_flush_buffer(struct raw3215_info
*raw
)
600 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
601 if (raw
->count
> 0) {
602 raw
->flags
|= RAW3215_FLUSHING
;
604 raw
->flags
&= ~RAW3215_FLUSHING
;
606 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
610 * Fire up a 3215 device.
612 static int raw3215_startup(struct raw3215_info
*raw
)
616 if (raw
->port
.flags
& ASYNC_INITIALIZED
)
619 raw
->port
.flags
|= ASYNC_INITIALIZED
;
620 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
622 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
628 * Shutdown a 3215 device.
630 static void raw3215_shutdown(struct raw3215_info
*raw
)
632 DECLARE_WAITQUEUE(wait
, current
);
635 if (!(raw
->port
.flags
& ASYNC_INITIALIZED
))
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
= IOINT_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 /* Request the console irq */
933 if (raw3215_startup(raw
) != 0) {
934 raw3215_free_info(raw
);
938 atomic_notifier_chain_register(&panic_notifier_list
, &on_panic_nb
);
939 register_reboot_notifier(&on_reboot_nb
);
940 register_console(&con3215
);
943 console_initcall(con3215_init
);
946 static int tty3215_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
948 struct raw3215_info
*raw
;
950 raw
= raw3215
[tty
->index
];
954 tty
->driver_data
= raw
;
956 return tty_port_install(&raw
->port
, driver
, tty
);
962 * This routine is called whenever a 3215 tty is opened.
964 static int tty3215_open(struct tty_struct
*tty
, struct file
* filp
)
966 struct raw3215_info
*raw
= tty
->driver_data
;
969 tty_port_tty_set(&raw
->port
, tty
);
971 tty
->low_latency
= 0; /* don't use bottom half for pushing chars */
973 * Start up 3215 device
975 retval
= raw3215_startup(raw
);
985 * This routine is called when the 3215 tty is closed. We wait
986 * for the remaining request to be completed. Then we clean up.
988 static void tty3215_close(struct tty_struct
*tty
, struct file
* filp
)
990 struct raw3215_info
*raw
;
992 raw
= (struct raw3215_info
*) tty
->driver_data
;
993 if (raw
== NULL
|| tty
->count
> 1)
996 /* Shutdown the terminal */
997 raw3215_shutdown(raw
);
998 tasklet_kill(&raw
->tlet
);
1000 tty_port_tty_set(&raw
->port
, NULL
);
1004 * Returns the amount of free space in the output buffer.
1006 static int tty3215_write_room(struct tty_struct
*tty
)
1008 struct raw3215_info
*raw
;
1010 raw
= (struct raw3215_info
*) tty
->driver_data
;
1012 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1013 if ((RAW3215_BUFFER_SIZE
- raw
->count
- TAB_STOP_SIZE
) >= 0)
1014 return RAW3215_BUFFER_SIZE
- raw
->count
- TAB_STOP_SIZE
;
1020 * String write routine for 3215 ttys
1022 static int tty3215_write(struct tty_struct
* tty
,
1023 const unsigned char *buf
, int count
)
1025 struct raw3215_info
*raw
;
1029 raw
= (struct raw3215_info
*) tty
->driver_data
;
1030 raw3215_write(raw
, buf
, count
);
1035 * Put character routine for 3215 ttys
1037 static int tty3215_put_char(struct tty_struct
*tty
, unsigned char ch
)
1039 struct raw3215_info
*raw
;
1043 raw
= (struct raw3215_info
*) tty
->driver_data
;
1044 raw3215_putchar(raw
, ch
);
1048 static void tty3215_flush_chars(struct tty_struct
*tty
)
1053 * Returns the number of characters in the output buffer
1055 static int tty3215_chars_in_buffer(struct tty_struct
*tty
)
1057 struct raw3215_info
*raw
;
1059 raw
= (struct raw3215_info
*) tty
->driver_data
;
1063 static void tty3215_flush_buffer(struct tty_struct
*tty
)
1065 struct raw3215_info
*raw
;
1067 raw
= (struct raw3215_info
*) tty
->driver_data
;
1068 raw3215_flush_buffer(raw
);
1073 * Disable reading from a 3215 tty
1075 static void tty3215_throttle(struct tty_struct
* tty
)
1077 struct raw3215_info
*raw
;
1079 raw
= (struct raw3215_info
*) tty
->driver_data
;
1080 raw
->flags
|= RAW3215_THROTTLED
;
1084 * Enable reading from a 3215 tty
1086 static void tty3215_unthrottle(struct tty_struct
* tty
)
1088 struct raw3215_info
*raw
;
1089 unsigned long flags
;
1091 raw
= (struct raw3215_info
*) tty
->driver_data
;
1092 if (raw
->flags
& RAW3215_THROTTLED
) {
1093 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
1094 raw
->flags
&= ~RAW3215_THROTTLED
;
1095 raw3215_try_io(raw
);
1096 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
1101 * Disable writing to a 3215 tty
1103 static void tty3215_stop(struct tty_struct
*tty
)
1105 struct raw3215_info
*raw
;
1107 raw
= (struct raw3215_info
*) tty
->driver_data
;
1108 raw
->flags
|= RAW3215_STOPPED
;
1112 * Enable writing to a 3215 tty
1114 static void tty3215_start(struct tty_struct
*tty
)
1116 struct raw3215_info
*raw
;
1117 unsigned long flags
;
1119 raw
= (struct raw3215_info
*) tty
->driver_data
;
1120 if (raw
->flags
& RAW3215_STOPPED
) {
1121 spin_lock_irqsave(get_ccwdev_lock(raw
->cdev
), flags
);
1122 raw
->flags
&= ~RAW3215_STOPPED
;
1123 raw3215_try_io(raw
);
1124 spin_unlock_irqrestore(get_ccwdev_lock(raw
->cdev
), flags
);
1128 static const struct tty_operations tty3215_ops
= {
1129 .install
= tty3215_install
,
1130 .open
= tty3215_open
,
1131 .close
= tty3215_close
,
1132 .write
= tty3215_write
,
1133 .put_char
= tty3215_put_char
,
1134 .flush_chars
= tty3215_flush_chars
,
1135 .write_room
= tty3215_write_room
,
1136 .chars_in_buffer
= tty3215_chars_in_buffer
,
1137 .flush_buffer
= tty3215_flush_buffer
,
1138 .throttle
= tty3215_throttle
,
1139 .unthrottle
= tty3215_unthrottle
,
1140 .stop
= tty3215_stop
,
1141 .start
= tty3215_start
,
1145 * 3215 tty registration code called from tty_init().
1146 * Most kernel services (incl. kmalloc) are available at this poimt.
1148 static int __init
tty3215_init(void)
1150 struct tty_driver
*driver
;
1153 if (!CONSOLE_IS_3215
)
1156 driver
= alloc_tty_driver(NR_3215
);
1160 ret
= ccw_driver_register(&raw3215_ccw_driver
);
1162 put_tty_driver(driver
);
1166 * Initialize the tty_driver structure
1167 * Entries in tty3215_driver that are NOT initialized:
1168 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1171 driver
->driver_name
= "tty3215";
1172 driver
->name
= "ttyS";
1173 driver
->major
= TTY_MAJOR
;
1174 driver
->minor_start
= 64;
1175 driver
->type
= TTY_DRIVER_TYPE_SYSTEM
;
1176 driver
->subtype
= SYSTEM_TYPE_TTY
;
1177 driver
->init_termios
= tty_std_termios
;
1178 driver
->init_termios
.c_iflag
= IGNBRK
| IGNPAR
;
1179 driver
->init_termios
.c_oflag
= ONLCR
| XTABS
;
1180 driver
->init_termios
.c_lflag
= ISIG
;
1181 driver
->flags
= TTY_DRIVER_REAL_RAW
;
1182 tty_set_operations(driver
, &tty3215_ops
);
1183 ret
= tty_register_driver(driver
);
1185 put_tty_driver(driver
);
1188 tty3215_driver
= driver
;
1192 static void __exit
tty3215_exit(void)
1194 tty_unregister_driver(tty3215_driver
);
1195 put_tty_driver(tty3215_driver
);
1196 ccw_driver_unregister(&raw3215_ccw_driver
);
1199 module_init(tty3215_init
);
1200 module_exit(tty3215_exit
);