2 * SCLP VT220 terminal driver.
4 * Copyright IBM Corp. 2003, 2009
6 * Author(s): Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com>
9 #include <linux/module.h>
10 #include <linux/spinlock.h>
11 #include <linux/list.h>
12 #include <linux/wait.h>
13 #include <linux/timer.h>
14 #include <linux/kernel.h>
15 #include <linux/tty.h>
16 #include <linux/tty_driver.h>
17 #include <linux/tty_flip.h>
18 #include <linux/errno.h>
20 #include <linux/major.h>
21 #include <linux/console.h>
22 #include <linux/kdev_t.h>
23 #include <linux/interrupt.h>
24 #include <linux/init.h>
25 #include <linux/reboot.h>
26 #include <linux/slab.h>
28 #include <asm/uaccess.h>
31 #define SCLP_VT220_MAJOR TTY_MAJOR
32 #define SCLP_VT220_MINOR 65
33 #define SCLP_VT220_DRIVER_NAME "sclp_vt220"
34 #define SCLP_VT220_DEVICE_NAME "ttysclp"
35 #define SCLP_VT220_CONSOLE_NAME "ttyS"
36 #define SCLP_VT220_CONSOLE_INDEX 1 /* console=ttyS1 */
38 /* Representation of a single write request */
39 struct sclp_vt220_request
{
40 struct list_head list
;
41 struct sclp_req sclp_req
;
46 struct sclp_vt220_sccb
{
47 struct sccb_header header
;
48 struct evbuf_header evbuf
;
51 #define SCLP_VT220_MAX_CHARS_PER_BUFFER (PAGE_SIZE - \
52 sizeof(struct sclp_vt220_request) - \
53 sizeof(struct sclp_vt220_sccb))
55 /* Structures and data needed to register tty driver */
56 static struct tty_driver
*sclp_vt220_driver
;
58 static struct tty_port sclp_vt220_port
;
60 /* Lock to protect internal data from concurrent access */
61 static spinlock_t sclp_vt220_lock
;
63 /* List of empty pages to be used as write request buffers */
64 static struct list_head sclp_vt220_empty
;
66 /* List of pending requests */
67 static struct list_head sclp_vt220_outqueue
;
69 /* Suspend mode flag */
70 static int sclp_vt220_suspended
;
72 /* Flag that output queue is currently running */
73 static int sclp_vt220_queue_running
;
75 /* Timer used for delaying write requests to merge subsequent messages into
77 static struct timer_list sclp_vt220_timer
;
79 /* Pointer to current request buffer which has been partially filled but not
81 static struct sclp_vt220_request
*sclp_vt220_current_request
;
83 /* Number of characters in current request buffer */
84 static int sclp_vt220_buffered_chars
;
86 /* Counter controlling core driver initialization. */
87 static int __initdata sclp_vt220_init_count
;
89 /* Flag indicating that sclp_vt220_current_request should really
90 * have been already queued but wasn't because the SCLP was processing
92 static int sclp_vt220_flush_later
;
94 static void sclp_vt220_receiver_fn(struct evbuf_header
*evbuf
);
95 static void sclp_vt220_pm_event_fn(struct sclp_register
*reg
,
96 enum sclp_pm_event sclp_pm_event
);
97 static int __sclp_vt220_emit(struct sclp_vt220_request
*request
);
98 static void sclp_vt220_emit_current(void);
100 /* Registration structure for SCLP output event buffers */
101 static struct sclp_register sclp_vt220_register
= {
102 .send_mask
= EVTYP_VT220MSG_MASK
,
103 .pm_event_fn
= sclp_vt220_pm_event_fn
,
106 /* Registration structure for SCLP input event buffers */
107 static struct sclp_register sclp_vt220_register_input
= {
108 .receive_mask
= EVTYP_VT220MSG_MASK
,
109 .receiver_fn
= sclp_vt220_receiver_fn
,
114 * Put provided request buffer back into queue and check emit pending
115 * buffers if necessary.
118 sclp_vt220_process_queue(struct sclp_vt220_request
*request
)
124 /* Put buffer back to list of empty buffers */
125 page
= request
->sclp_req
.sccb
;
126 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
127 /* Move request from outqueue to empty queue */
128 list_del(&request
->list
);
129 list_add_tail((struct list_head
*) page
, &sclp_vt220_empty
);
130 /* Check if there is a pending buffer on the out queue. */
132 if (!list_empty(&sclp_vt220_outqueue
))
133 request
= list_entry(sclp_vt220_outqueue
.next
,
134 struct sclp_vt220_request
, list
);
135 if (!request
|| sclp_vt220_suspended
) {
136 sclp_vt220_queue_running
= 0;
137 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
140 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
141 } while (__sclp_vt220_emit(request
));
142 if (request
== NULL
&& sclp_vt220_flush_later
)
143 sclp_vt220_emit_current();
144 tty_port_tty_wakeup(&sclp_vt220_port
);
147 #define SCLP_BUFFER_MAX_RETRY 1
150 * Callback through which the result of a write request is reported by the
154 sclp_vt220_callback(struct sclp_req
*request
, void *data
)
156 struct sclp_vt220_request
*vt220_request
;
157 struct sclp_vt220_sccb
*sccb
;
159 vt220_request
= (struct sclp_vt220_request
*) data
;
160 if (request
->status
== SCLP_REQ_FAILED
) {
161 sclp_vt220_process_queue(vt220_request
);
164 sccb
= (struct sclp_vt220_sccb
*) vt220_request
->sclp_req
.sccb
;
166 /* Check SCLP response code and choose suitable action */
167 switch (sccb
->header
.response_code
) {
171 case 0x05f0: /* Target resource in improper state */
174 case 0x0340: /* Contained SCLP equipment check */
175 if (++vt220_request
->retry_count
> SCLP_BUFFER_MAX_RETRY
)
177 /* Remove processed buffers and requeue rest */
178 if (sclp_remove_processed((struct sccb_header
*) sccb
) > 0) {
179 /* Not all buffers were processed */
180 sccb
->header
.response_code
= 0x0000;
181 vt220_request
->sclp_req
.status
= SCLP_REQ_FILLED
;
182 if (sclp_add_request(request
) == 0)
187 case 0x0040: /* SCLP equipment check */
188 if (++vt220_request
->retry_count
> SCLP_BUFFER_MAX_RETRY
)
190 sccb
->header
.response_code
= 0x0000;
191 vt220_request
->sclp_req
.status
= SCLP_REQ_FILLED
;
192 if (sclp_add_request(request
) == 0)
199 sclp_vt220_process_queue(vt220_request
);
203 * Emit vt220 request buffer to SCLP. Return zero on success, non-zero
207 __sclp_vt220_emit(struct sclp_vt220_request
*request
)
209 if (!(sclp_vt220_register
.sclp_receive_mask
& EVTYP_VT220MSG_MASK
)) {
210 request
->sclp_req
.status
= SCLP_REQ_FAILED
;
213 request
->sclp_req
.command
= SCLP_CMDW_WRITE_EVENT_DATA
;
214 request
->sclp_req
.status
= SCLP_REQ_FILLED
;
215 request
->sclp_req
.callback
= sclp_vt220_callback
;
216 request
->sclp_req
.callback_data
= (void *) request
;
218 return sclp_add_request(&request
->sclp_req
);
222 * Queue and emit current request.
225 sclp_vt220_emit_current(void)
228 struct sclp_vt220_request
*request
;
229 struct sclp_vt220_sccb
*sccb
;
231 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
232 if (sclp_vt220_current_request
) {
233 sccb
= (struct sclp_vt220_sccb
*)
234 sclp_vt220_current_request
->sclp_req
.sccb
;
235 /* Only emit buffers with content */
236 if (sccb
->header
.length
!= sizeof(struct sclp_vt220_sccb
)) {
237 list_add_tail(&sclp_vt220_current_request
->list
,
238 &sclp_vt220_outqueue
);
239 sclp_vt220_current_request
= NULL
;
240 if (timer_pending(&sclp_vt220_timer
))
241 del_timer(&sclp_vt220_timer
);
243 sclp_vt220_flush_later
= 0;
245 if (sclp_vt220_queue_running
|| sclp_vt220_suspended
)
247 if (list_empty(&sclp_vt220_outqueue
))
249 request
= list_first_entry(&sclp_vt220_outqueue
,
250 struct sclp_vt220_request
, list
);
251 sclp_vt220_queue_running
= 1;
252 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
254 if (__sclp_vt220_emit(request
))
255 sclp_vt220_process_queue(request
);
258 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
261 #define SCLP_NORMAL_WRITE 0x00
264 * Helper function to initialize a page with the sclp request structure.
266 static struct sclp_vt220_request
*
267 sclp_vt220_initialize_page(void *page
)
269 struct sclp_vt220_request
*request
;
270 struct sclp_vt220_sccb
*sccb
;
272 /* Place request structure at end of page */
273 request
= ((struct sclp_vt220_request
*)
274 ((addr_t
) page
+ PAGE_SIZE
)) - 1;
275 request
->retry_count
= 0;
276 request
->sclp_req
.sccb
= page
;
277 /* SCCB goes at start of page */
278 sccb
= (struct sclp_vt220_sccb
*) page
;
279 memset((void *) sccb
, 0, sizeof(struct sclp_vt220_sccb
));
280 sccb
->header
.length
= sizeof(struct sclp_vt220_sccb
);
281 sccb
->header
.function_code
= SCLP_NORMAL_WRITE
;
282 sccb
->header
.response_code
= 0x0000;
283 sccb
->evbuf
.type
= EVTYP_VT220MSG
;
284 sccb
->evbuf
.length
= sizeof(struct evbuf_header
);
289 static inline unsigned int
290 sclp_vt220_space_left(struct sclp_vt220_request
*request
)
292 struct sclp_vt220_sccb
*sccb
;
293 sccb
= (struct sclp_vt220_sccb
*) request
->sclp_req
.sccb
;
294 return PAGE_SIZE
- sizeof(struct sclp_vt220_request
) -
298 static inline unsigned int
299 sclp_vt220_chars_stored(struct sclp_vt220_request
*request
)
301 struct sclp_vt220_sccb
*sccb
;
302 sccb
= (struct sclp_vt220_sccb
*) request
->sclp_req
.sccb
;
303 return sccb
->evbuf
.length
- sizeof(struct evbuf_header
);
307 * Add msg to buffer associated with request. Return the number of characters
311 sclp_vt220_add_msg(struct sclp_vt220_request
*request
,
312 const unsigned char *msg
, int count
, int convertlf
)
314 struct sclp_vt220_sccb
*sccb
;
320 if (count
> sclp_vt220_space_left(request
))
321 count
= sclp_vt220_space_left(request
);
325 sccb
= (struct sclp_vt220_sccb
*) request
->sclp_req
.sccb
;
326 buffer
= (void *) ((addr_t
) sccb
+ sccb
->header
.length
);
329 /* Perform Linefeed conversion (0x0a -> 0x0a 0x0d)*/
331 (from
< count
) && (to
< sclp_vt220_space_left(request
));
333 /* Retrieve character */
335 /* Perform conversion */
337 if (to
+ 1 < sclp_vt220_space_left(request
)) {
338 ((unsigned char *) buffer
)[to
++] = c
;
339 ((unsigned char *) buffer
)[to
++] = 0x0d;
344 ((unsigned char *) buffer
)[to
++] = c
;
346 sccb
->header
.length
+= to
;
347 sccb
->evbuf
.length
+= to
;
350 memcpy(buffer
, (const void *) msg
, count
);
351 sccb
->header
.length
+= count
;
352 sccb
->evbuf
.length
+= count
;
358 * Emit buffer after having waited long enough for more data to arrive.
361 sclp_vt220_timeout(unsigned long data
)
363 sclp_vt220_emit_current();
366 #define BUFFER_MAX_DELAY HZ/20
369 * Drop oldest console buffer if sclp_con_drop is set
372 sclp_vt220_drop_buffer(void)
374 struct list_head
*list
;
375 struct sclp_vt220_request
*request
;
378 if (!sclp_console_drop
)
380 list
= sclp_vt220_outqueue
.next
;
381 if (sclp_vt220_queue_running
)
382 /* The first element is in I/O */
384 if (list
== &sclp_vt220_outqueue
)
387 request
= list_entry(list
, struct sclp_vt220_request
, list
);
388 page
= request
->sclp_req
.sccb
;
389 list_add_tail((struct list_head
*) page
, &sclp_vt220_empty
);
394 * Internal implementation of the write function. Write COUNT bytes of data
396 * to the SCLP interface. In case that the data does not fit into the current
397 * write buffer, emit the current one and allocate a new one. If there are no
398 * more empty buffers available, wait until one gets emptied. If DO_SCHEDULE
399 * is non-zero, the buffer will be scheduled for emitting after a timeout -
400 * otherwise the user has to explicitly call the flush function.
401 * A non-zero CONVERTLF parameter indicates that 0x0a characters in the message
402 * buffer should be converted to 0x0a 0x0d. After completion, return the number
406 __sclp_vt220_write(const unsigned char *buf
, int count
, int do_schedule
,
407 int convertlf
, int may_fail
)
417 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
419 /* Create an sclp output buffer if none exists yet */
420 if (sclp_vt220_current_request
== NULL
) {
421 if (list_empty(&sclp_vt220_empty
))
423 while (list_empty(&sclp_vt220_empty
)) {
424 if (may_fail
|| sclp_vt220_suspended
)
426 if (sclp_vt220_drop_buffer())
428 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
431 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
433 page
= (void *) sclp_vt220_empty
.next
;
434 list_del((struct list_head
*) page
);
435 sclp_vt220_current_request
=
436 sclp_vt220_initialize_page(page
);
438 /* Try to write the string to the current request buffer */
439 written
= sclp_vt220_add_msg(sclp_vt220_current_request
,
440 buf
, count
, convertlf
);
441 overall_written
+= written
;
442 if (written
== count
)
445 * Not all characters could be written to the current
446 * output buffer. Emit the buffer, create a new buffer
447 * and then output the rest of the string.
449 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
450 sclp_vt220_emit_current();
451 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
455 /* Setup timer to output current console buffer after some time */
456 if (sclp_vt220_current_request
!= NULL
&&
457 !timer_pending(&sclp_vt220_timer
) && do_schedule
) {
458 sclp_vt220_timer
.function
= sclp_vt220_timeout
;
459 sclp_vt220_timer
.data
= 0UL;
460 sclp_vt220_timer
.expires
= jiffies
+ BUFFER_MAX_DELAY
;
461 add_timer(&sclp_vt220_timer
);
464 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
465 return overall_written
;
469 * This routine is called by the kernel to write a series of
470 * characters to the tty device. The characters may come from
471 * user space or kernel space. This routine will return the
472 * number of characters actually accepted for writing.
475 sclp_vt220_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
477 return __sclp_vt220_write(buf
, count
, 1, 0, 1);
480 #define SCLP_VT220_SESSION_ENDED 0x01
481 #define SCLP_VT220_SESSION_STARTED 0x80
482 #define SCLP_VT220_SESSION_DATA 0x00
485 * Called by the SCLP to report incoming event buffers.
488 sclp_vt220_receiver_fn(struct evbuf_header
*evbuf
)
493 buffer
= (char *) ((addr_t
) evbuf
+ sizeof(struct evbuf_header
));
494 count
= evbuf
->length
- sizeof(struct evbuf_header
);
497 case SCLP_VT220_SESSION_ENDED
:
498 case SCLP_VT220_SESSION_STARTED
:
500 case SCLP_VT220_SESSION_DATA
:
501 /* Send input to line discipline */
504 tty_insert_flip_string(&sclp_vt220_port
, buffer
, count
);
505 tty_flip_buffer_push(&sclp_vt220_port
);
511 * This routine is called when a particular tty device is opened.
514 sclp_vt220_open(struct tty_struct
*tty
, struct file
*filp
)
516 if (tty
->count
== 1) {
517 tty_port_tty_set(&sclp_vt220_port
, tty
);
518 sclp_vt220_port
.low_latency
= 0;
519 if (!tty
->winsize
.ws_row
&& !tty
->winsize
.ws_col
) {
520 tty
->winsize
.ws_row
= 24;
521 tty
->winsize
.ws_col
= 80;
528 * This routine is called when a particular tty device is closed.
531 sclp_vt220_close(struct tty_struct
*tty
, struct file
*filp
)
534 tty_port_tty_set(&sclp_vt220_port
, NULL
);
538 * This routine is called by the kernel to write a single
539 * character to the tty device. If the kernel uses this routine,
540 * it must call the flush_chars() routine (if defined) when it is
541 * done stuffing characters into the driver.
544 sclp_vt220_put_char(struct tty_struct
*tty
, unsigned char ch
)
546 return __sclp_vt220_write(&ch
, 1, 0, 0, 1);
550 * This routine is called by the kernel after it has written a
551 * series of characters to the tty device using put_char().
554 sclp_vt220_flush_chars(struct tty_struct
*tty
)
556 if (!sclp_vt220_queue_running
)
557 sclp_vt220_emit_current();
559 sclp_vt220_flush_later
= 1;
563 * This routine returns the numbers of characters the tty driver
564 * will accept for queuing to be written. This number is subject
565 * to change as output buffers get emptied, or if the output flow
569 sclp_vt220_write_room(struct tty_struct
*tty
)
575 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
577 if (sclp_vt220_current_request
!= NULL
)
578 count
= sclp_vt220_space_left(sclp_vt220_current_request
);
579 list_for_each(l
, &sclp_vt220_empty
)
580 count
+= SCLP_VT220_MAX_CHARS_PER_BUFFER
;
581 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
586 * Return number of buffered chars.
589 sclp_vt220_chars_in_buffer(struct tty_struct
*tty
)
593 struct sclp_vt220_request
*r
;
596 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
598 if (sclp_vt220_current_request
!= NULL
)
599 count
= sclp_vt220_chars_stored(sclp_vt220_current_request
);
600 list_for_each(l
, &sclp_vt220_outqueue
) {
601 r
= list_entry(l
, struct sclp_vt220_request
, list
);
602 count
+= sclp_vt220_chars_stored(r
);
604 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
609 * Pass on all buffers to the hardware. Return only when there are no more
613 sclp_vt220_flush_buffer(struct tty_struct
*tty
)
615 sclp_vt220_emit_current();
618 /* Release allocated pages. */
619 static void __init
__sclp_vt220_free_pages(void)
621 struct list_head
*page
, *p
;
623 list_for_each_safe(page
, p
, &sclp_vt220_empty
) {
625 free_page((unsigned long) page
);
629 /* Release memory and unregister from sclp core. Controlled by init counting -
630 * only the last invoker will actually perform these actions. */
631 static void __init
__sclp_vt220_cleanup(void)
633 sclp_vt220_init_count
--;
634 if (sclp_vt220_init_count
!= 0)
636 sclp_unregister(&sclp_vt220_register
);
637 __sclp_vt220_free_pages();
638 tty_port_destroy(&sclp_vt220_port
);
641 /* Allocate buffer pages and register with sclp core. Controlled by init
642 * counting - only the first invoker will actually perform these actions. */
643 static int __init
__sclp_vt220_init(int num_pages
)
649 sclp_vt220_init_count
++;
650 if (sclp_vt220_init_count
!= 1)
652 spin_lock_init(&sclp_vt220_lock
);
653 INIT_LIST_HEAD(&sclp_vt220_empty
);
654 INIT_LIST_HEAD(&sclp_vt220_outqueue
);
655 init_timer(&sclp_vt220_timer
);
656 tty_port_init(&sclp_vt220_port
);
657 sclp_vt220_current_request
= NULL
;
658 sclp_vt220_buffered_chars
= 0;
659 sclp_vt220_flush_later
= 0;
661 /* Allocate pages for output buffering */
663 for (i
= 0; i
< num_pages
; i
++) {
664 page
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
667 list_add_tail(page
, &sclp_vt220_empty
);
669 rc
= sclp_register(&sclp_vt220_register
);
672 __sclp_vt220_free_pages();
673 sclp_vt220_init_count
--;
674 tty_port_destroy(&sclp_vt220_port
);
679 static const struct tty_operations sclp_vt220_ops
= {
680 .open
= sclp_vt220_open
,
681 .close
= sclp_vt220_close
,
682 .write
= sclp_vt220_write
,
683 .put_char
= sclp_vt220_put_char
,
684 .flush_chars
= sclp_vt220_flush_chars
,
685 .write_room
= sclp_vt220_write_room
,
686 .chars_in_buffer
= sclp_vt220_chars_in_buffer
,
687 .flush_buffer
= sclp_vt220_flush_buffer
,
691 * Register driver with SCLP and Linux and initialize internal tty structures.
693 static int __init
sclp_vt220_tty_init(void)
695 struct tty_driver
*driver
;
698 /* Note: we're not testing for CONSOLE_IS_SCLP here to preserve
699 * symmetry between VM and LPAR systems regarding ttyS1. */
700 driver
= alloc_tty_driver(1);
703 rc
= __sclp_vt220_init(MAX_KMEM_PAGES
);
707 driver
->driver_name
= SCLP_VT220_DRIVER_NAME
;
708 driver
->name
= SCLP_VT220_DEVICE_NAME
;
709 driver
->major
= SCLP_VT220_MAJOR
;
710 driver
->minor_start
= SCLP_VT220_MINOR
;
711 driver
->type
= TTY_DRIVER_TYPE_SYSTEM
;
712 driver
->subtype
= SYSTEM_TYPE_TTY
;
713 driver
->init_termios
= tty_std_termios
;
714 driver
->flags
= TTY_DRIVER_REAL_RAW
;
715 tty_set_operations(driver
, &sclp_vt220_ops
);
716 tty_port_link_device(&sclp_vt220_port
, driver
, 0);
718 rc
= tty_register_driver(driver
);
721 rc
= sclp_register(&sclp_vt220_register_input
);
724 sclp_vt220_driver
= driver
;
728 tty_unregister_driver(driver
);
730 __sclp_vt220_cleanup();
732 put_tty_driver(driver
);
735 __initcall(sclp_vt220_tty_init
);
737 static void __sclp_vt220_flush_buffer(void)
741 sclp_vt220_emit_current();
742 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
743 if (timer_pending(&sclp_vt220_timer
))
744 del_timer(&sclp_vt220_timer
);
745 while (sclp_vt220_queue_running
) {
746 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
748 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
750 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
754 * Resume console: If there are cached messages, emit them.
756 static void sclp_vt220_resume(void)
760 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
761 sclp_vt220_suspended
= 0;
762 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
763 sclp_vt220_emit_current();
767 * Suspend console: Set suspend flag and flush console
769 static void sclp_vt220_suspend(void)
773 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
774 sclp_vt220_suspended
= 1;
775 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
776 __sclp_vt220_flush_buffer();
779 static void sclp_vt220_pm_event_fn(struct sclp_register
*reg
,
780 enum sclp_pm_event sclp_pm_event
)
782 switch (sclp_pm_event
) {
783 case SCLP_PM_EVENT_FREEZE
:
784 sclp_vt220_suspend();
786 case SCLP_PM_EVENT_RESTORE
:
787 case SCLP_PM_EVENT_THAW
:
793 #ifdef CONFIG_SCLP_VT220_CONSOLE
796 sclp_vt220_con_write(struct console
*con
, const char *buf
, unsigned int count
)
798 __sclp_vt220_write((const unsigned char *) buf
, count
, 1, 1, 0);
801 static struct tty_driver
*
802 sclp_vt220_con_device(struct console
*c
, int *index
)
805 return sclp_vt220_driver
;
809 sclp_vt220_notify(struct notifier_block
*self
,
810 unsigned long event
, void *data
)
812 __sclp_vt220_flush_buffer();
816 static struct notifier_block on_panic_nb
= {
817 .notifier_call
= sclp_vt220_notify
,
821 static struct notifier_block on_reboot_nb
= {
822 .notifier_call
= sclp_vt220_notify
,
826 /* Structure needed to register with printk */
827 static struct console sclp_vt220_console
=
829 .name
= SCLP_VT220_CONSOLE_NAME
,
830 .write
= sclp_vt220_con_write
,
831 .device
= sclp_vt220_con_device
,
832 .flags
= CON_PRINTBUFFER
,
833 .index
= SCLP_VT220_CONSOLE_INDEX
837 sclp_vt220_con_init(void)
841 if (!CONSOLE_IS_SCLP
)
843 rc
= __sclp_vt220_init(sclp_console_pages
);
846 /* Attach linux console */
847 atomic_notifier_chain_register(&panic_notifier_list
, &on_panic_nb
);
848 register_reboot_notifier(&on_reboot_nb
);
849 register_console(&sclp_vt220_console
);
853 console_initcall(sclp_vt220_con_init
);
854 #endif /* CONFIG_SCLP_VT220_CONSOLE */