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 our interest in SCLP event buffers */
101 static struct sclp_register sclp_vt220_register
= {
102 .send_mask
= EVTYP_VT220MSG_MASK
,
103 .receive_mask
= EVTYP_VT220MSG_MASK
,
104 .state_change_fn
= NULL
,
105 .receiver_fn
= sclp_vt220_receiver_fn
,
106 .pm_event_fn
= sclp_vt220_pm_event_fn
,
111 * Put provided request buffer back into queue and check emit pending
112 * buffers if necessary.
115 sclp_vt220_process_queue(struct sclp_vt220_request
*request
)
117 struct tty_struct
*tty
;
122 /* Put buffer back to list of empty buffers */
123 page
= request
->sclp_req
.sccb
;
124 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
125 /* Move request from outqueue to empty queue */
126 list_del(&request
->list
);
127 list_add_tail((struct list_head
*) page
, &sclp_vt220_empty
);
128 /* Check if there is a pending buffer on the out queue. */
130 if (!list_empty(&sclp_vt220_outqueue
))
131 request
= list_entry(sclp_vt220_outqueue
.next
,
132 struct sclp_vt220_request
, list
);
133 if (!request
|| sclp_vt220_suspended
) {
134 sclp_vt220_queue_running
= 0;
135 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
138 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
139 } while (__sclp_vt220_emit(request
));
140 if (request
== NULL
&& sclp_vt220_flush_later
)
141 sclp_vt220_emit_current();
142 /* Check if the tty needs a wake up call */
143 tty
= tty_port_tty_get(&sclp_vt220_port
);
150 #define SCLP_BUFFER_MAX_RETRY 1
153 * Callback through which the result of a write request is reported by the
157 sclp_vt220_callback(struct sclp_req
*request
, void *data
)
159 struct sclp_vt220_request
*vt220_request
;
160 struct sclp_vt220_sccb
*sccb
;
162 vt220_request
= (struct sclp_vt220_request
*) data
;
163 if (request
->status
== SCLP_REQ_FAILED
) {
164 sclp_vt220_process_queue(vt220_request
);
167 sccb
= (struct sclp_vt220_sccb
*) vt220_request
->sclp_req
.sccb
;
169 /* Check SCLP response code and choose suitable action */
170 switch (sccb
->header
.response_code
) {
174 case 0x05f0: /* Target resource in improper state */
177 case 0x0340: /* Contained SCLP equipment check */
178 if (++vt220_request
->retry_count
> SCLP_BUFFER_MAX_RETRY
)
180 /* Remove processed buffers and requeue rest */
181 if (sclp_remove_processed((struct sccb_header
*) sccb
) > 0) {
182 /* Not all buffers were processed */
183 sccb
->header
.response_code
= 0x0000;
184 vt220_request
->sclp_req
.status
= SCLP_REQ_FILLED
;
185 if (sclp_add_request(request
) == 0)
190 case 0x0040: /* SCLP equipment check */
191 if (++vt220_request
->retry_count
> SCLP_BUFFER_MAX_RETRY
)
193 sccb
->header
.response_code
= 0x0000;
194 vt220_request
->sclp_req
.status
= SCLP_REQ_FILLED
;
195 if (sclp_add_request(request
) == 0)
202 sclp_vt220_process_queue(vt220_request
);
206 * Emit vt220 request buffer to SCLP. Return zero on success, non-zero
210 __sclp_vt220_emit(struct sclp_vt220_request
*request
)
212 if (!(sclp_vt220_register
.sclp_receive_mask
& EVTYP_VT220MSG_MASK
)) {
213 request
->sclp_req
.status
= SCLP_REQ_FAILED
;
216 request
->sclp_req
.command
= SCLP_CMDW_WRITE_EVENT_DATA
;
217 request
->sclp_req
.status
= SCLP_REQ_FILLED
;
218 request
->sclp_req
.callback
= sclp_vt220_callback
;
219 request
->sclp_req
.callback_data
= (void *) request
;
221 return sclp_add_request(&request
->sclp_req
);
225 * Queue and emit current request.
228 sclp_vt220_emit_current(void)
231 struct sclp_vt220_request
*request
;
232 struct sclp_vt220_sccb
*sccb
;
234 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
235 if (sclp_vt220_current_request
) {
236 sccb
= (struct sclp_vt220_sccb
*)
237 sclp_vt220_current_request
->sclp_req
.sccb
;
238 /* Only emit buffers with content */
239 if (sccb
->header
.length
!= sizeof(struct sclp_vt220_sccb
)) {
240 list_add_tail(&sclp_vt220_current_request
->list
,
241 &sclp_vt220_outqueue
);
242 sclp_vt220_current_request
= NULL
;
243 if (timer_pending(&sclp_vt220_timer
))
244 del_timer(&sclp_vt220_timer
);
246 sclp_vt220_flush_later
= 0;
248 if (sclp_vt220_queue_running
|| sclp_vt220_suspended
)
250 if (list_empty(&sclp_vt220_outqueue
))
252 request
= list_first_entry(&sclp_vt220_outqueue
,
253 struct sclp_vt220_request
, list
);
254 sclp_vt220_queue_running
= 1;
255 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
257 if (__sclp_vt220_emit(request
))
258 sclp_vt220_process_queue(request
);
261 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
264 #define SCLP_NORMAL_WRITE 0x00
267 * Helper function to initialize a page with the sclp request structure.
269 static struct sclp_vt220_request
*
270 sclp_vt220_initialize_page(void *page
)
272 struct sclp_vt220_request
*request
;
273 struct sclp_vt220_sccb
*sccb
;
275 /* Place request structure at end of page */
276 request
= ((struct sclp_vt220_request
*)
277 ((addr_t
) page
+ PAGE_SIZE
)) - 1;
278 request
->retry_count
= 0;
279 request
->sclp_req
.sccb
= page
;
280 /* SCCB goes at start of page */
281 sccb
= (struct sclp_vt220_sccb
*) page
;
282 memset((void *) sccb
, 0, sizeof(struct sclp_vt220_sccb
));
283 sccb
->header
.length
= sizeof(struct sclp_vt220_sccb
);
284 sccb
->header
.function_code
= SCLP_NORMAL_WRITE
;
285 sccb
->header
.response_code
= 0x0000;
286 sccb
->evbuf
.type
= EVTYP_VT220MSG
;
287 sccb
->evbuf
.length
= sizeof(struct evbuf_header
);
292 static inline unsigned int
293 sclp_vt220_space_left(struct sclp_vt220_request
*request
)
295 struct sclp_vt220_sccb
*sccb
;
296 sccb
= (struct sclp_vt220_sccb
*) request
->sclp_req
.sccb
;
297 return PAGE_SIZE
- sizeof(struct sclp_vt220_request
) -
301 static inline unsigned int
302 sclp_vt220_chars_stored(struct sclp_vt220_request
*request
)
304 struct sclp_vt220_sccb
*sccb
;
305 sccb
= (struct sclp_vt220_sccb
*) request
->sclp_req
.sccb
;
306 return sccb
->evbuf
.length
- sizeof(struct evbuf_header
);
310 * Add msg to buffer associated with request. Return the number of characters
314 sclp_vt220_add_msg(struct sclp_vt220_request
*request
,
315 const unsigned char *msg
, int count
, int convertlf
)
317 struct sclp_vt220_sccb
*sccb
;
323 if (count
> sclp_vt220_space_left(request
))
324 count
= sclp_vt220_space_left(request
);
328 sccb
= (struct sclp_vt220_sccb
*) request
->sclp_req
.sccb
;
329 buffer
= (void *) ((addr_t
) sccb
+ sccb
->header
.length
);
332 /* Perform Linefeed conversion (0x0a -> 0x0a 0x0d)*/
334 (from
< count
) && (to
< sclp_vt220_space_left(request
));
336 /* Retrieve character */
338 /* Perform conversion */
340 if (to
+ 1 < sclp_vt220_space_left(request
)) {
341 ((unsigned char *) buffer
)[to
++] = c
;
342 ((unsigned char *) buffer
)[to
++] = 0x0d;
347 ((unsigned char *) buffer
)[to
++] = c
;
349 sccb
->header
.length
+= to
;
350 sccb
->evbuf
.length
+= to
;
353 memcpy(buffer
, (const void *) msg
, count
);
354 sccb
->header
.length
+= count
;
355 sccb
->evbuf
.length
+= count
;
361 * Emit buffer after having waited long enough for more data to arrive.
364 sclp_vt220_timeout(unsigned long data
)
366 sclp_vt220_emit_current();
369 #define BUFFER_MAX_DELAY HZ/20
372 * Internal implementation of the write function. Write COUNT bytes of data
374 * to the SCLP interface. In case that the data does not fit into the current
375 * write buffer, emit the current one and allocate a new one. If there are no
376 * more empty buffers available, wait until one gets emptied. If DO_SCHEDULE
377 * is non-zero, the buffer will be scheduled for emitting after a timeout -
378 * otherwise the user has to explicitly call the flush function.
379 * A non-zero CONVERTLF parameter indicates that 0x0a characters in the message
380 * buffer should be converted to 0x0a 0x0d. After completion, return the number
384 __sclp_vt220_write(const unsigned char *buf
, int count
, int do_schedule
,
385 int convertlf
, int may_fail
)
395 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
397 /* Create an sclp output buffer if none exists yet */
398 if (sclp_vt220_current_request
== NULL
) {
399 while (list_empty(&sclp_vt220_empty
)) {
400 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
401 if (may_fail
|| sclp_vt220_suspended
)
405 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
407 page
= (void *) sclp_vt220_empty
.next
;
408 list_del((struct list_head
*) page
);
409 sclp_vt220_current_request
=
410 sclp_vt220_initialize_page(page
);
412 /* Try to write the string to the current request buffer */
413 written
= sclp_vt220_add_msg(sclp_vt220_current_request
,
414 buf
, count
, convertlf
);
415 overall_written
+= written
;
416 if (written
== count
)
419 * Not all characters could be written to the current
420 * output buffer. Emit the buffer, create a new buffer
421 * and then output the rest of the string.
423 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
424 sclp_vt220_emit_current();
425 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
429 /* Setup timer to output current console buffer after some time */
430 if (sclp_vt220_current_request
!= NULL
&&
431 !timer_pending(&sclp_vt220_timer
) && do_schedule
) {
432 sclp_vt220_timer
.function
= sclp_vt220_timeout
;
433 sclp_vt220_timer
.data
= 0UL;
434 sclp_vt220_timer
.expires
= jiffies
+ BUFFER_MAX_DELAY
;
435 add_timer(&sclp_vt220_timer
);
437 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
439 return overall_written
;
443 * This routine is called by the kernel to write a series of
444 * characters to the tty device. The characters may come from
445 * user space or kernel space. This routine will return the
446 * number of characters actually accepted for writing.
449 sclp_vt220_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
451 return __sclp_vt220_write(buf
, count
, 1, 0, 1);
454 #define SCLP_VT220_SESSION_ENDED 0x01
455 #define SCLP_VT220_SESSION_STARTED 0x80
456 #define SCLP_VT220_SESSION_DATA 0x00
459 * Called by the SCLP to report incoming event buffers.
462 sclp_vt220_receiver_fn(struct evbuf_header
*evbuf
)
464 struct tty_struct
*tty
= tty_port_tty_get(&sclp_vt220_port
);
468 /* Ignore input if device is not open */
472 buffer
= (char *) ((addr_t
) evbuf
+ sizeof(struct evbuf_header
));
473 count
= evbuf
->length
- sizeof(struct evbuf_header
);
476 case SCLP_VT220_SESSION_ENDED
:
477 case SCLP_VT220_SESSION_STARTED
:
479 case SCLP_VT220_SESSION_DATA
:
480 /* Send input to line discipline */
483 tty_insert_flip_string(tty
, buffer
, count
);
484 tty_flip_buffer_push(tty
);
491 * This routine is called when a particular tty device is opened.
494 sclp_vt220_open(struct tty_struct
*tty
, struct file
*filp
)
496 if (tty
->count
== 1) {
497 tty_port_tty_set(&sclp_vt220_port
, tty
);
498 tty
->low_latency
= 0;
499 if (!tty
->winsize
.ws_row
&& !tty
->winsize
.ws_col
) {
500 tty
->winsize
.ws_row
= 24;
501 tty
->winsize
.ws_col
= 80;
508 * This routine is called when a particular tty device is closed.
511 sclp_vt220_close(struct tty_struct
*tty
, struct file
*filp
)
514 tty_port_tty_set(&sclp_vt220_port
, NULL
);
518 * This routine is called by the kernel to write a single
519 * character to the tty device. If the kernel uses this routine,
520 * it must call the flush_chars() routine (if defined) when it is
521 * done stuffing characters into the driver.
524 sclp_vt220_put_char(struct tty_struct
*tty
, unsigned char ch
)
526 return __sclp_vt220_write(&ch
, 1, 0, 0, 1);
530 * This routine is called by the kernel after it has written a
531 * series of characters to the tty device using put_char().
534 sclp_vt220_flush_chars(struct tty_struct
*tty
)
536 if (!sclp_vt220_queue_running
)
537 sclp_vt220_emit_current();
539 sclp_vt220_flush_later
= 1;
543 * This routine returns the numbers of characters the tty driver
544 * will accept for queuing to be written. This number is subject
545 * to change as output buffers get emptied, or if the output flow
549 sclp_vt220_write_room(struct tty_struct
*tty
)
555 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
557 if (sclp_vt220_current_request
!= NULL
)
558 count
= sclp_vt220_space_left(sclp_vt220_current_request
);
559 list_for_each(l
, &sclp_vt220_empty
)
560 count
+= SCLP_VT220_MAX_CHARS_PER_BUFFER
;
561 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
566 * Return number of buffered chars.
569 sclp_vt220_chars_in_buffer(struct tty_struct
*tty
)
573 struct sclp_vt220_request
*r
;
576 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
578 if (sclp_vt220_current_request
!= NULL
)
579 count
= sclp_vt220_chars_stored(sclp_vt220_current_request
);
580 list_for_each(l
, &sclp_vt220_outqueue
) {
581 r
= list_entry(l
, struct sclp_vt220_request
, list
);
582 count
+= sclp_vt220_chars_stored(r
);
584 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
589 * Pass on all buffers to the hardware. Return only when there are no more
593 sclp_vt220_flush_buffer(struct tty_struct
*tty
)
595 sclp_vt220_emit_current();
598 /* Release allocated pages. */
599 static void __init
__sclp_vt220_free_pages(void)
601 struct list_head
*page
, *p
;
603 list_for_each_safe(page
, p
, &sclp_vt220_empty
) {
605 free_page((unsigned long) page
);
609 /* Release memory and unregister from sclp core. Controlled by init counting -
610 * only the last invoker will actually perform these actions. */
611 static void __init
__sclp_vt220_cleanup(void)
613 sclp_vt220_init_count
--;
614 if (sclp_vt220_init_count
!= 0)
616 sclp_unregister(&sclp_vt220_register
);
617 __sclp_vt220_free_pages();
620 /* Allocate buffer pages and register with sclp core. Controlled by init
621 * counting - only the first invoker will actually perform these actions. */
622 static int __init
__sclp_vt220_init(int num_pages
)
628 sclp_vt220_init_count
++;
629 if (sclp_vt220_init_count
!= 1)
631 spin_lock_init(&sclp_vt220_lock
);
632 INIT_LIST_HEAD(&sclp_vt220_empty
);
633 INIT_LIST_HEAD(&sclp_vt220_outqueue
);
634 init_timer(&sclp_vt220_timer
);
635 tty_port_init(&sclp_vt220_port
);
636 sclp_vt220_current_request
= NULL
;
637 sclp_vt220_buffered_chars
= 0;
638 sclp_vt220_flush_later
= 0;
640 /* Allocate pages for output buffering */
642 for (i
= 0; i
< num_pages
; i
++) {
643 page
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
646 list_add_tail(page
, &sclp_vt220_empty
);
648 rc
= sclp_register(&sclp_vt220_register
);
651 __sclp_vt220_free_pages();
652 sclp_vt220_init_count
--;
657 static const struct tty_operations sclp_vt220_ops
= {
658 .open
= sclp_vt220_open
,
659 .close
= sclp_vt220_close
,
660 .write
= sclp_vt220_write
,
661 .put_char
= sclp_vt220_put_char
,
662 .flush_chars
= sclp_vt220_flush_chars
,
663 .write_room
= sclp_vt220_write_room
,
664 .chars_in_buffer
= sclp_vt220_chars_in_buffer
,
665 .flush_buffer
= sclp_vt220_flush_buffer
,
669 * Register driver with SCLP and Linux and initialize internal tty structures.
671 static int __init
sclp_vt220_tty_init(void)
673 struct tty_driver
*driver
;
676 /* Note: we're not testing for CONSOLE_IS_SCLP here to preserve
677 * symmetry between VM and LPAR systems regarding ttyS1. */
678 driver
= alloc_tty_driver(1);
681 rc
= __sclp_vt220_init(MAX_KMEM_PAGES
);
685 driver
->driver_name
= SCLP_VT220_DRIVER_NAME
;
686 driver
->name
= SCLP_VT220_DEVICE_NAME
;
687 driver
->major
= SCLP_VT220_MAJOR
;
688 driver
->minor_start
= SCLP_VT220_MINOR
;
689 driver
->type
= TTY_DRIVER_TYPE_SYSTEM
;
690 driver
->subtype
= SYSTEM_TYPE_TTY
;
691 driver
->init_termios
= tty_std_termios
;
692 driver
->flags
= TTY_DRIVER_REAL_RAW
;
693 tty_set_operations(driver
, &sclp_vt220_ops
);
695 rc
= tty_register_driver(driver
);
698 sclp_vt220_driver
= driver
;
702 __sclp_vt220_cleanup();
704 put_tty_driver(driver
);
707 __initcall(sclp_vt220_tty_init
);
709 static void __sclp_vt220_flush_buffer(void)
713 sclp_vt220_emit_current();
714 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
715 if (timer_pending(&sclp_vt220_timer
))
716 del_timer(&sclp_vt220_timer
);
717 while (sclp_vt220_queue_running
) {
718 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
720 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
722 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
726 * Resume console: If there are cached messages, emit them.
728 static void sclp_vt220_resume(void)
732 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
733 sclp_vt220_suspended
= 0;
734 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
735 sclp_vt220_emit_current();
739 * Suspend console: Set suspend flag and flush console
741 static void sclp_vt220_suspend(void)
745 spin_lock_irqsave(&sclp_vt220_lock
, flags
);
746 sclp_vt220_suspended
= 1;
747 spin_unlock_irqrestore(&sclp_vt220_lock
, flags
);
748 __sclp_vt220_flush_buffer();
751 static void sclp_vt220_pm_event_fn(struct sclp_register
*reg
,
752 enum sclp_pm_event sclp_pm_event
)
754 switch (sclp_pm_event
) {
755 case SCLP_PM_EVENT_FREEZE
:
756 sclp_vt220_suspend();
758 case SCLP_PM_EVENT_RESTORE
:
759 case SCLP_PM_EVENT_THAW
:
765 #ifdef CONFIG_SCLP_VT220_CONSOLE
768 sclp_vt220_con_write(struct console
*con
, const char *buf
, unsigned int count
)
770 __sclp_vt220_write((const unsigned char *) buf
, count
, 1, 1, 0);
773 static struct tty_driver
*
774 sclp_vt220_con_device(struct console
*c
, int *index
)
777 return sclp_vt220_driver
;
781 sclp_vt220_notify(struct notifier_block
*self
,
782 unsigned long event
, void *data
)
784 __sclp_vt220_flush_buffer();
788 static struct notifier_block on_panic_nb
= {
789 .notifier_call
= sclp_vt220_notify
,
793 static struct notifier_block on_reboot_nb
= {
794 .notifier_call
= sclp_vt220_notify
,
798 /* Structure needed to register with printk */
799 static struct console sclp_vt220_console
=
801 .name
= SCLP_VT220_CONSOLE_NAME
,
802 .write
= sclp_vt220_con_write
,
803 .device
= sclp_vt220_con_device
,
804 .flags
= CON_PRINTBUFFER
,
805 .index
= SCLP_VT220_CONSOLE_INDEX
809 sclp_vt220_con_init(void)
813 if (!CONSOLE_IS_SCLP
)
815 rc
= __sclp_vt220_init(MAX_CONSOLE_PAGES
);
818 /* Attach linux console */
819 atomic_notifier_chain_register(&panic_notifier_list
, &on_panic_nb
);
820 register_reboot_notifier(&on_reboot_nb
);
821 register_console(&sclp_vt220_console
);
825 console_initcall(sclp_vt220_con_init
);
826 #endif /* CONFIG_SCLP_VT220_CONSOLE */