tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * LCD, LED and Button interface for Cobalt
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1996, 1997 by Andrew Bose
9 *
10 * Linux kernel version history:
11 * March 2001: Ported from 2.0.34 by Liam Davies
12 *
13 */
14
15#define RTC_IO_EXTENT 0x10 /*Only really two ports, but... */
16
17#include <linux/config.h>
18#include <linux/types.h>
19#include <linux/errno.h>
20#include <linux/miscdevice.h>
21#include <linux/slab.h>
22#include <linux/ioport.h>
23#include <linux/fcntl.h>
24#include <linux/mc146818rtc.h>
25#include <linux/netdevice.h>
26#include <linux/sched.h>
27#include <linux/delay.h>
28
29#include <asm/io.h>
30#include <asm/uaccess.h>
31#include <asm/system.h>
32#include <linux/delay.h>
33
34#include "lcd.h"
35
36static DEFINE_SPINLOCK(lcd_lock);
37
38static int lcd_ioctl(struct inode *inode, struct file *file,
39 unsigned int cmd, unsigned long arg);
40
41static unsigned int lcd_present = 1;
42
43/* used in arch/mips/cobalt/reset.c */
44int led_state = 0;
45
46#if defined(CONFIG_TULIP) && 0
47
48#define MAX_INTERFACES 8
49static linkcheck_func_t linkcheck_callbacks[MAX_INTERFACES];
50static void *linkcheck_cookies[MAX_INTERFACES];
51
52int lcd_register_linkcheck_func(int iface_num, void *func, void *cookie)
53{
54 if (iface_num < 0 ||
55 iface_num >= MAX_INTERFACES ||
56 linkcheck_callbacks[iface_num] != NULL)
57 return -1;
58 linkcheck_callbacks[iface_num] = (linkcheck_func_t) func;
59 linkcheck_cookies[iface_num] = cookie;
60 return 0;
61}
62#endif
63
64static int lcd_ioctl(struct inode *inode, struct file *file,
65 unsigned int cmd, unsigned long arg)
66{
67 struct lcd_display button_display;
68 unsigned long address, a;
69
70 switch (cmd) {
71 case LCD_On:
72 udelay(150);
73 BusyCheck();
74 LCDWriteInst(0x0F);
75 break;
76
77 case LCD_Off:
78 udelay(150);
79 BusyCheck();
80 LCDWriteInst(0x08);
81 break;
82
83 case LCD_Reset:
84 udelay(150);
85 LCDWriteInst(0x3F);
86 udelay(150);
87 LCDWriteInst(0x3F);
88 udelay(150);
89 LCDWriteInst(0x3F);
90 udelay(150);
91 LCDWriteInst(0x3F);
92 udelay(150);
93 LCDWriteInst(0x01);
94 udelay(150);
95 LCDWriteInst(0x06);
96 break;
97
98 case LCD_Clear:
99 udelay(150);
100 BusyCheck();
101 LCDWriteInst(0x01);
102 break;
103
104 case LCD_Cursor_Left:
105 udelay(150);
106 BusyCheck();
107 LCDWriteInst(0x10);
108 break;
109
110 case LCD_Cursor_Right:
111 udelay(150);
112 BusyCheck();
113 LCDWriteInst(0x14);
114 break;
115
116 case LCD_Cursor_Off:
117 udelay(150);
118 BusyCheck();
119 LCDWriteInst(0x0C);
120 break;
121
122 case LCD_Cursor_On:
123 udelay(150);
124 BusyCheck();
125 LCDWriteInst(0x0F);
126 break;
127
128 case LCD_Blink_Off:
129 udelay(150);
130 BusyCheck();
131 LCDWriteInst(0x0E);
132 break;
133
134 case LCD_Get_Cursor_Pos:{
135 struct lcd_display display;
136
137 udelay(150);
138 BusyCheck();
139 display.cursor_address = (LCDReadInst);
140 display.cursor_address =
141 (display.cursor_address & 0x07F);
142 if (copy_to_user
143 ((struct lcd_display *) arg, &display,
144 sizeof(struct lcd_display)))
145 return -EFAULT;
146
147 break;
148 }
149
150
151 case LCD_Set_Cursor_Pos:{
152 struct lcd_display display;
153
154 if (copy_from_user
155 (&display, (struct lcd_display *) arg,
156 sizeof(struct lcd_display)))
157 return -EFAULT;
158
159 a = (display.cursor_address | kLCD_Addr);
160
161 udelay(150);
162 BusyCheck();
163 LCDWriteInst(a);
164
165 break;
166 }
167
168 case LCD_Get_Cursor:{
169 struct lcd_display display;
170
171 udelay(150);
172 BusyCheck();
173 display.character = LCDReadData;
174
175 if (copy_to_user
176 ((struct lcd_display *) arg, &display,
177 sizeof(struct lcd_display)))
178 return -EFAULT;
179 udelay(150);
180 BusyCheck();
181 LCDWriteInst(0x10);
182
183 break;
184 }
185
186 case LCD_Set_Cursor:{
187 struct lcd_display display;
188
189 if (copy_from_user
190 (&display, (struct lcd_display *) arg,
191 sizeof(struct lcd_display)))
192 return -EFAULT;
193
194 udelay(150);
195 BusyCheck();
196 LCDWriteData(display.character);
197 udelay(150);
198 BusyCheck();
199 LCDWriteInst(0x10);
200
201 break;
202 }
203
204
205 case LCD_Disp_Left:
206 udelay(150);
207 BusyCheck();
208 LCDWriteInst(0x18);
209 break;
210
211 case LCD_Disp_Right:
212 udelay(150);
213 BusyCheck();
214 LCDWriteInst(0x1C);
215 break;
216
217 case LCD_Home:
218 udelay(150);
219 BusyCheck();
220 LCDWriteInst(0x02);
221 break;
222
223 case LCD_Write:{
224 struct lcd_display display;
225 unsigned int index;
226
227
228 if (copy_from_user
229 (&display, (struct lcd_display *) arg,
230 sizeof(struct lcd_display)))
231 return -EFAULT;
232
233 udelay(150);
234 BusyCheck();
235 LCDWriteInst(0x80);
236 udelay(150);
237 BusyCheck();
238
239 for (index = 0; index < (display.size1); index++) {
240 udelay(150);
241 BusyCheck();
242 LCDWriteData(display.line1[index]);
243 BusyCheck();
244 }
245
246 udelay(150);
247 BusyCheck();
248 LCDWriteInst(0xC0);
249 udelay(150);
250 BusyCheck();
251 for (index = 0; index < (display.size2); index++) {
252 udelay(150);
253 BusyCheck();
254 LCDWriteData(display.line2[index]);
255 }
256
257 break;
258 }
259
260 case LCD_Read:{
261 struct lcd_display display;
262
263 BusyCheck();
264 for (address = kDD_R00; address <= kDD_R01;
265 address++) {
266 a = (address | kLCD_Addr);
267
268 udelay(150);
269 BusyCheck();
270 LCDWriteInst(a);
271 udelay(150);
272 BusyCheck();
273 display.line1[address] = LCDReadData;
274 }
275
276 display.line1[0x27] = '\0';
277
278 for (address = kDD_R10; address <= kDD_R11;
279 address++) {
280 a = (address | kLCD_Addr);
281
282 udelay(150);
283 BusyCheck();
284 LCDWriteInst(a);
285
286 udelay(150);
287 BusyCheck();
288 display.line2[address - 0x40] =
289 LCDReadData;
290 }
291
292 display.line2[0x27] = '\0';
293
294 if (copy_to_user
295 ((struct lcd_display *) arg, &display,
296 sizeof(struct lcd_display)))
297 return -EFAULT;
298 break;
299 }
300
301// set all GPIO leds to led_display.leds
302
303 case LED_Set:{
304 struct lcd_display led_display;
305
306
307 if (copy_from_user
308 (&led_display, (struct lcd_display *) arg,
309 sizeof(struct lcd_display)))
310 return -EFAULT;
311
312 led_state = led_display.leds;
313 LEDSet(led_state);
314
315 break;
316 }
317
318
319// set only bit led_display.leds
320
321 case LED_Bit_Set:{
322 unsigned int i;
323 int bit = 1;
324 struct lcd_display led_display;
325
326
327 if (copy_from_user
328 (&led_display, (struct lcd_display *) arg,
329 sizeof(struct lcd_display)))
330 return -EFAULT;
331
332 for (i = 0; i < (int) led_display.leds; i++) {
333 bit = 2 * bit;
334 }
335
336 led_state = led_state | bit;
337 LEDSet(led_state);
338 break;
339 }
340
341// clear only bit led_display.leds
342
343 case LED_Bit_Clear:{
344 unsigned int i;
345 int bit = 1;
346 struct lcd_display led_display;
347
348
349 if (copy_from_user
350 (&led_display, (struct lcd_display *) arg,
351 sizeof(struct lcd_display)))
352 return -EFAULT;
353
354 for (i = 0; i < (int) led_display.leds; i++) {
355 bit = 2 * bit;
356 }
357
358 led_state = led_state & ~bit;
359 LEDSet(led_state);
360 break;
361 }
362
363
364 case BUTTON_Read:{
365 button_display.buttons = GPIRead;
366 if (copy_to_user
367 ((struct lcd_display *) arg, &button_display,
368 sizeof(struct lcd_display)))
369 return -EFAULT;
370 break;
371 }
372
373 case LINK_Check:{
374 button_display.buttons =
375 *((volatile unsigned long *) (0xB0100060));
376 if (copy_to_user
377 ((struct lcd_display *) arg, &button_display,
378 sizeof(struct lcd_display)))
379 return -EFAULT;
380 break;
381 }
382
383 case LINK_Check_2:{
384 int iface_num;
385
386 /* panel-utils should pass in the desired interface status is wanted for
387 * in "buttons" of the structure. We will set this to non-zero if the
388 * link is in fact up for the requested interface. --DaveM
389 */
390 if (copy_from_user
391 (&button_display, (struct lcd_display *) arg,
392 sizeof(button_display)))
393 return -EFAULT;
394 iface_num = button_display.buttons;
395#if defined(CONFIG_TULIP) && 0
396 if (iface_num >= 0 &&
397 iface_num < MAX_INTERFACES &&
398 linkcheck_callbacks[iface_num] != NULL) {
399 button_display.buttons =
400 linkcheck_callbacks[iface_num]
401 (linkcheck_cookies[iface_num]);
402 } else
403#endif
404 button_display.buttons = 0;
405
406 if (__copy_to_user
407 ((struct lcd_display *) arg, &button_display,
408 sizeof(struct lcd_display)))
409 return -EFAULT;
410 break;
411 }
412
413// Erase the flash
414
415 case FLASH_Erase:{
416
417 int ctr = 0;
418
419 if ( !capable(CAP_SYS_ADMIN) ) return -EPERM;
420
421 pr_info(LCD "Erasing Flash\n");
422
423 // Chip Erase Sequence
424 WRITE_FLASH(kFlash_Addr1, kFlash_Data1);
425 WRITE_FLASH(kFlash_Addr2, kFlash_Data2);
426 WRITE_FLASH(kFlash_Addr1, kFlash_Erase3);
427 WRITE_FLASH(kFlash_Addr1, kFlash_Data1);
428 WRITE_FLASH(kFlash_Addr2, kFlash_Data2);
429 WRITE_FLASH(kFlash_Addr1, kFlash_Erase6);
430
431 while ((!dqpoll(0x00000000, 0xFF))
432 && (!timeout(0x00000000))) {
433 ctr++;
434 }
435
436 if (READ_FLASH(0x07FFF0) == 0xFF) {
437 pr_info(LCD "Erase Successful\n");
438 } else if (timeout) {
439 pr_info(LCD "Erase Timed Out\n");
440 }
441
442 break;
443 }
444
445// burn the flash
446
447 case FLASH_Burn:{
448
449 volatile unsigned long burn_addr;
450 unsigned long flags;
451 unsigned int i, index;
452 unsigned char *rom;
453
454
455 struct lcd_display display;
456
457 if ( !capable(CAP_SYS_ADMIN) ) return -EPERM;
458
459 if (copy_from_user
460 (&display, (struct lcd_display *) arg,
461 sizeof(struct lcd_display)))
462 return -EFAULT;
463 rom = (unsigned char *) kmalloc((128), GFP_ATOMIC);
464 if (rom == NULL) {
465 printk(KERN_ERR LCD "kmalloc() failed in %s\n",
466 __FUNCTION__);
467 return -ENOMEM;
468 }
469
470 pr_info(LCD "Starting Flash burn\n");
471 for (i = 0; i < FLASH_SIZE; i = i + 128) {
472
473 if (copy_from_user
474 (rom, display.RomImage + i, 128)) {
475 kfree(rom);
476 return -EFAULT;
477 }
478 burn_addr = kFlashBase + i;
479 spin_lock_irqsave(&lcd_lock, flags);
480 for (index = 0; index < (128); index++) {
481
482 WRITE_FLASH(kFlash_Addr1,
483 kFlash_Data1);
484 WRITE_FLASH(kFlash_Addr2,
485 kFlash_Data2);
486 WRITE_FLASH(kFlash_Addr1,
487 kFlash_Prog);
488 *((volatile unsigned char *)burn_addr) =
489 (volatile unsigned char) rom[index];
490
491 while ((!dqpoll (burn_addr,
492 (volatile unsigned char)
493 rom[index])) &&
494 (!timeout(burn_addr))) { }
495 burn_addr++;
496 }
497 spin_unlock_irqrestore(&lcd_lock, flags);
498 if (* ((volatile unsigned char *)
499 (burn_addr - 1)) ==
500 (volatile unsigned char)
501 rom[index - 1]) {
502 } else if (timeout) {
503 pr_info(LCD "Flash burn timed out\n");
504 }
505
506
507 }
508 kfree(rom);
509
510 pr_info(LCD "Flash successfully burned\n");
511
512 break;
513 }
514
515// read the flash all at once
516
517 case FLASH_Read:{
518
519 unsigned char *user_bytes;
520 volatile unsigned long read_addr;
521 unsigned int i;
522
523 user_bytes =
524 &(((struct lcd_display *) arg)->RomImage[0]);
525
526 if (!access_ok
527 (VERIFY_WRITE, user_bytes, FLASH_SIZE))
528 return -EFAULT;
529
530 pr_info(LCD "Reading Flash");
531 for (i = 0; i < FLASH_SIZE; i++) {
532 unsigned char tmp_byte;
533 read_addr = kFlashBase + i;
534 tmp_byte =
535 *((volatile unsigned char *)
536 read_addr);
537 if (__put_user(tmp_byte, &user_bytes[i]))
538 return -EFAULT;
539 }
540
541
542 break;
543 }
544
545 default:
546 return -EINVAL;
547
548 }
549
550 return 0;
551
552}
553
554static int lcd_open(struct inode *inode, struct file *file)
555{
556 if (!lcd_present)
557 return -ENXIO;
558 else
559 return 0;
560}
561
562/* Only RESET or NEXT counts as button pressed */
563
564static inline int button_pressed(void)
565{
566 unsigned long buttons = GPIRead;
567
568 if ((buttons == BUTTON_Next) || (buttons == BUTTON_Next_B)
569 || (buttons == BUTTON_Reset_B))
570 return buttons;
571 return 0;
572}
573
574/* LED daemon sits on this and we wake him up once a key is pressed. */
575
576static int lcd_waiters = 0;
577
578static long lcd_read(struct inode *inode, struct file *file, char *buf,
579 unsigned long count)
580{
581 long buttons_now;
582
583 if (lcd_waiters > 0)
584 return -EINVAL;
585
586 lcd_waiters++;
587 while (((buttons_now = (long) button_pressed()) == 0) &&
588 !(signal_pending(current))) {
589 msleep_interruptible(2000);
590 }
591 lcd_waiters--;
592
593 if (signal_pending(current))
594 return -ERESTARTSYS;
595 return buttons_now;
596}
597
598/*
599 * The various file operations we support.
600 */
601
602static struct file_operations lcd_fops = {
603 .read = lcd_read,
604 .ioctl = lcd_ioctl,
605 .open = lcd_open,
606};
607
608static struct miscdevice lcd_dev = {
609 MISC_DYNAMIC_MINOR,
610 "lcd",
611 &lcd_fops
612};
613
614static int lcd_init(void)
615{
616 unsigned long data;
617
618 pr_info("%s\n", LCD_DRIVER);
619 misc_register(&lcd_dev);
620
621 /* Check region? Naaah! Just snarf it up. */
622/* request_region(RTC_PORT(0), RTC_IO_EXTENT, "lcd");*/
623
624 udelay(150);
625 data = LCDReadData;
626 if ((data & 0x000000FF) == (0x00)) {
627 lcd_present = 0;
628 pr_info(LCD "LCD Not Present\n");
629 } else {
630 lcd_present = 1;
631 WRITE_GAL(kGal_DevBank2PReg, kGal_DevBank2Cfg);
632 WRITE_GAL(kGal_DevBank3PReg, kGal_DevBank3Cfg);
633 }
634
635 return 0;
636}
637
638static void __exit lcd_exit(void)
639{
640 misc_deregister(&lcd_dev);
641}
642
643//
644// Function: dqpoll
645//
646// Description: Polls the data lines to see if the flash is busy
647//
648// In: address, byte data
649//
650// Out: 0 = busy, 1 = write or erase complete
651//
652//
653
654static int dqpoll(volatile unsigned long address, volatile unsigned char data)
655{
656 volatile unsigned char dq7;
657
658 dq7 = data & 0x80;
659
660 return ((READ_FLASH(address) & 0x80) == dq7);
661}
662
663//
664// Function: timeout
665//
666// Description: Checks to see if erase or write has timed out
667// By polling dq5
668//
669// In: address
670//
671//
672// Out: 0 = not timed out, 1 = timed out
673
674static int timeout(volatile unsigned long address)
675{
676 return (READ_FLASH(address) & 0x20) == 0x20;
677}
678
679module_init(lcd_init);
680module_exit(lcd_exit);
681
682MODULE_AUTHOR("Andrew Bose");
683MODULE_LICENSE("GPL");