summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/chips/sharp.c
blob: c3cf0f63bc93639ad151a35b8867e554452548a7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/*
 * MTD chip driver for pre-CFI Sharp flash chips
 *
 * Copyright 2000,2001 David A. Schleef <ds@schleef.org>
 *           2000,2001 Lineo, Inc.
 *
 * $Id: sharp.c,v 1.14 2004/08/09 13:19:43 dwmw2 Exp $
 *
 * Devices supported:
 *   LH28F016SCT Symmetrical block flash memory, 2Mx8
 *   LH28F008SCT Symmetrical block flash memory, 1Mx8
 *
 * Documentation:
 *   http://www.sharpmeg.com/datasheets/memic/flashcmp/
 *   http://www.sharpmeg.com/datasheets/memic/flashcmp/01symf/16m/016sctl9.pdf
 *   016sctl9.pdf
 *
 * Limitations:
 *   This driver only supports 4x1 arrangement of chips.
 *   Not tested on anything but PowerPC.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/cfi.h>
#include <linux/delay.h>
#include <linux/init.h>

#define CMD_RESET		0xffffffff
#define CMD_READ_ID		0x90909090
#define CMD_READ_STATUS		0x70707070
#define CMD_CLEAR_STATUS	0x50505050
#define CMD_BLOCK_ERASE_1	0x20202020
#define CMD_BLOCK_ERASE_2	0xd0d0d0d0
#define CMD_BYTE_WRITE		0x40404040
#define CMD_SUSPEND		0xb0b0b0b0
#define CMD_RESUME		0xd0d0d0d0
#define CMD_SET_BLOCK_LOCK_1	0x60606060
#define CMD_SET_BLOCK_LOCK_2	0x01010101
#define CMD_SET_MASTER_LOCK_1	0x60606060
#define CMD_SET_MASTER_LOCK_2	0xf1f1f1f1
#define CMD_CLEAR_BLOCK_LOCKS_1	0x60606060
#define CMD_CLEAR_BLOCK_LOCKS_2	0xd0d0d0d0

#define SR_READY		0x80808080 // 1 = ready
#define SR_ERASE_SUSPEND	0x40404040 // 1 = block erase suspended
#define SR_ERROR_ERASE		0x20202020 // 1 = error in block erase or clear lock bits
#define SR_ERROR_WRITE		0x10101010 // 1 = error in byte write or set lock bit
#define	SR_VPP			0x08080808 // 1 = Vpp is low
#define SR_WRITE_SUSPEND	0x04040404 // 1 = byte write suspended
#define SR_PROTECT		0x02020202 // 1 = lock bit set
#define SR_RESERVED		0x01010101

#define SR_ERRORS (SR_ERROR_ERASE|SR_ERROR_WRITE|SR_VPP|SR_PROTECT)

/* Configuration options */

#undef AUTOUNLOCK  /* automatically unlocks blocks before erasing */

struct mtd_info *sharp_probe(struct map_info *);

static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd);

static int sharp_read(struct mtd_info *mtd, loff_t from, size_t len,
	size_t *retlen, u_char *buf);
static int sharp_write(struct mtd_info *mtd, loff_t from, size_t len,
	size_t *retlen, const u_char *buf);
static int sharp_erase(struct mtd_info *mtd, struct erase_info *instr);
static void sharp_sync(struct mtd_info *mtd);
static int sharp_suspend(struct mtd_info *mtd);
static void sharp_resume(struct mtd_info *mtd);
static void sharp_destroy(struct mtd_info *mtd);

static int sharp_write_oneword(struct map_info *map, struct flchip *chip,
	unsigned long adr, __u32 datum);
static int sharp_erase_oneblock(struct map_info *map, struct flchip *chip,
	unsigned long adr);
#ifdef AUTOUNLOCK
static void sharp_unlock_oneblock(struct map_info *map, struct flchip *chip,
	unsigned long adr);
#endif


struct sharp_info{
	struct flchip *chip;
	int bogus;
	int chipshift;
	int numchips;
	struct flchip chips[1];
};

struct mtd_info *sharp_probe(struct map_info *map);
static void sharp_destroy(struct mtd_info *mtd);

static struct mtd_chip_driver sharp_chipdrv = {
	.probe		= sharp_probe,
	.destroy	= sharp_destroy,
	.name		= "sharp",
	.module		= THIS_MODULE
};


struct mtd_info *sharp_probe(struct map_info *map)
{
	struct mtd_info *mtd = NULL;
	struct sharp_info *sharp = NULL;
	int width;

	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
	if(!mtd)
		return NULL;

	sharp = kmalloc(sizeof(*sharp), GFP_KERNEL);
	if(!sharp) {
		kfree(mtd);
		return NULL;
	}

	memset(mtd, 0, sizeof(*mtd));

	width = sharp_probe_map(map,mtd);
	if(!width){
		kfree(mtd);
		kfree(sharp);
		return NULL;
	}

	mtd->priv = map;
	mtd->type = MTD_NORFLASH;
	mtd->erase = sharp_erase;
	mtd->read = sharp_read;
	mtd->write = sharp_write;
	mtd->sync = sharp_sync;
	mtd->suspend = sharp_suspend;
	mtd->resume = sharp_resume;
	mtd->flags = MTD_CAP_NORFLASH;
	mtd->name = map->name;

	memset(sharp, 0, sizeof(*sharp));
	sharp->chipshift = 23;
	sharp->numchips = 1;
	sharp->chips[0].start = 0;
	sharp->chips[0].state = FL_READY;
	sharp->chips[0].mutex = &sharp->chips[0]._spinlock;
	sharp->chips[0].word_write_time = 0;
	init_waitqueue_head(&sharp->chips[0].wq);
	spin_lock_init(&sharp->chips[0]._spinlock);

	map->fldrv = &sharp_chipdrv;
	map->fldrv_priv = sharp;

	__module_get(THIS_MODULE);
	return mtd;
}

static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd)
{
	unsigned long tmp;
	unsigned long base = 0;
	u32 read0, read4;
	int width = 4;

	tmp = map_read32(map, base+0);

	map_write32(map, CMD_READ_ID, base+0);

	read0=map_read32(map, base+0);
	read4=map_read32(map, base+4);
	if(read0 == 0x89898989){
		printk("Looks like sharp flash\n");
		switch(read4){
		case 0xaaaaaaaa:
		case 0xa0a0a0a0:
			/* aa - LH28F016SCT-L95 2Mx8, 32 64k blocks*/
			/* a0 - LH28F016SCT-Z4  2Mx8, 32 64k blocks*/
			mtd->erasesize = 0x10000 * width;
			mtd->size = 0x200000 * width;
			return width;
		case 0xa6a6a6a6:
			/* a6 - LH28F008SCT-L12 1Mx8, 16 64k blocks*/
			/* a6 - LH28F008SCR-L85 1Mx8, 16 64k blocks*/
			mtd->erasesize = 0x10000 * width;
			mtd->size = 0x100000 * width;
			return width;
#if 0
		case 0x00000000: /* unknown */
			/* XX - LH28F004SCT 512kx8, 8 64k blocks*/
			mtd->erasesize = 0x10000 * width;
			mtd->size = 0x80000 * width;
			return width;
#endif
		default:
			printk("Sort-of looks like sharp flash, 0x%08x 0x%08x\n",
				read0,read4);
		}
	}else if((map_read32(map, base+0) == CMD_READ_ID)){
		/* RAM, probably */
		printk("Looks like RAM\n");
		map_write32(map, tmp, base+0);
	}else{
		printk("Doesn't look like sharp flash, 0x%08x 0x%08x\n",
			read0,read4);
	}

	return 0;
}

/* This function returns with the chip->mutex lock held. */
static int sharp_wait(struct map_info *map, struct flchip *chip)
{
	__u16 status;
	unsigned long timeo = jiffies + HZ;
	DECLARE_WAITQUEUE(wait, current);
	int adr = 0;

retry:
	spin_lock_bh(chip->mutex);

	switch(chip->state){
	case FL_READY:
		map_write32(map,CMD_READ_STATUS,adr);
		chip->state = FL_STATUS;
	case FL_STATUS:
		status = map_read32(map,adr);
//printk("status=%08x\n",status);

		udelay(100);
		if((status & SR_READY)!=SR_READY){
//printk(".status=%08x\n",status);
			udelay(100);
		}
		break;
	default:
		printk("Waiting for chip\n");

		set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue(&chip->wq, &wait);

		spin_unlock_bh(chip->mutex);

		schedule();
		remove_wait_queue(&chip->wq, &wait);

		if(signal_pending(current))
			return -EINTR;

		timeo = jiffies + HZ;

		goto retry;
	}

	map_write32(map,CMD_RESET, adr);

	chip->state = FL_READY;

	return 0;
}

static void sharp_release(struct flchip *chip)
{
	wake_up(&chip->wq);
	spin_unlock_bh(chip->mutex);
}

static int sharp_read(struct mtd_info *mtd, loff_t from, size_t len,
	size_t *retlen, u_char *buf)
{
	struct map_info *map = mtd->priv;
	struct sharp_info *sharp = map->fldrv_priv;
	int chipnum;
	int ret = 0;
	int ofs = 0;

	chipnum = (from >> sharp->chipshift);
	ofs = from & ((1 << sharp->chipshift)-1);

	*retlen = 0;

	while(len){
		unsigned long thislen;

		if(chipnum>=sharp->numchips)
			break;

		thislen = len;
		if(ofs+thislen >= (1<<sharp->chipshift))
			thislen = (1<<sharp->chipshift) - ofs;

		ret = sharp_wait(map,&sharp->chips[chipnum]);
		if(ret<0)
			break;

		map_copy_from(map,buf,ofs,thislen);

		sharp_release(&sharp->chips[chipnum]);

		*retlen += thislen;
		len -= thislen;
		buf += thislen;

		ofs = 0;
		chipnum++;
	}
	return ret;
}

static int sharp_write(struct mtd_info *mtd, loff_t to, size_t len,
	size_t *retlen, const u_char *buf)
{
	struct map_info *map = mtd->priv;
	struct sharp_info *sharp = map->fldrv_priv;
	int ret = 0;
	int i,j;
	int chipnum;
	unsigned long ofs;
	union { u32 l; unsigned char uc[4]; } tbuf;

	*retlen = 0;

	while(len){
		tbuf.l = 0xffffffff;
		chipnum = to >> sharp->chipshift;
		ofs = to & ((1<<sharp->chipshift)-1);

		j=0;
		for(i=ofs&3;i<4 && len;i++){
			tbuf.uc[i] = *buf;
			buf++;
			to++;
			len--;
			j++;
		}
		sharp_write_oneword(map, &sharp->chips[chipnum], ofs&~3, tbuf.l);
		if(ret<0)
			return ret;
		(*retlen)+=j;
	}

	return 0;
}

static int sharp_write_oneword(struct map_info *map, struct flchip *chip,
	unsigned long adr, __u32 datum)
{
	int ret;
	int timeo;
	int try;
	int i;
	int status = 0;

	ret = sharp_wait(map,chip);

	for(try=0;try<10;try++){
		map_write32(map,CMD_BYTE_WRITE,adr);
		/* cpu_to_le32 -> hack to fix the writel be->le conversion */
		map_write32(map,cpu_to_le32(datum),adr);

		chip->state = FL_WRITING;

		timeo = jiffies + (HZ/2);

		map_write32(map,CMD_READ_STATUS,adr);
		for(i=0;i<100;i++){
			status = map_read32(map,adr);
			if((status & SR_READY)==SR_READY)
				break;
		}
		if(i==100){
			printk("sharp: timed out writing\n");
		}

		if(!(status&SR_ERRORS))
			break;

		printk("sharp: error writing byte at addr=%08lx status=%08x\n",adr,status);

		map_write32(map,CMD_CLEAR_STATUS,adr);
	}
	map_write32(map,CMD_RESET,adr);
	chip->state = FL_READY;

	wake_up(&chip->wq);
	spin_unlock_bh(chip->mutex);

	return 0;
}

static int sharp_erase(struct mtd_info *mtd, struct erase_info *instr)
{
	struct map_info *map = mtd->priv;
	struct sharp_info *sharp = map->fldrv_priv;
	unsigned long adr,len;
	int chipnum, ret=0;

//printk("sharp_erase()\n");
	if(instr->addr & (mtd->erasesize - 1))
		return -EINVAL;
	if(instr->len & (mtd->erasesize - 1))
		return -EINVAL;
	if(instr->len + instr->addr > mtd->size)
		return -EINVAL;

	chipnum = instr->addr >> sharp->chipshift;
	adr = instr->addr & ((1<<sharp->chipshift)-1);
	len = instr->len;

	while(len){
		ret = sharp_erase_oneblock(map, &sharp->chips[chipnum], adr);
		if(ret)return ret;

		adr += mtd->erasesize;
		len -= mtd->erasesize;
		if(adr >> sharp->chipshift){
			adr = 0;
			chipnum++;
			if(chipnum>=sharp->numchips)
				break;
		}
	}

	instr->state = MTD_ERASE_DONE;
	mtd_erase_callback(instr);

	return 0;
}

static int sharp_do_wait_for_ready(struct map_info *map, struct flchip *chip,
	unsigned long adr)
{
	int ret;
	unsigned long timeo;
	int status;
	DECLARE_WAITQUEUE(wait, current);

	map_write32(map,CMD_READ_STATUS,adr);
	status = map_read32(map,adr);

	timeo = jiffies + HZ;

	while(time_before(jiffies, timeo)){
		map_write32(map,CMD_READ_STATUS,adr);
		status = map_read32(map,adr);
		if((status & SR_READY)==SR_READY){
			ret = 0;
			goto out;
		}
		set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue(&chip->wq, &wait);

		//spin_unlock_bh(chip->mutex);

		schedule_timeout(1);
		schedule();
		remove_wait_queue(&chip->wq, &wait);

		//spin_lock_bh(chip->mutex);
		
		if (signal_pending(current)){
			ret = -EINTR;
			goto out;
		}
		
	}
	ret = -ETIME;
out:
	return ret;
}

static int sharp_erase_oneblock(struct map_info *map, struct flchip *chip,
	unsigned long adr)
{
	int ret;
	//int timeo;
	int status;
	//int i;

//printk("sharp_erase_oneblock()\n");

#ifdef AUTOUNLOCK
	/* This seems like a good place to do an unlock */
	sharp_unlock_oneblock(map,chip,adr);
#endif

	map_write32(map,CMD_BLOCK_ERASE_1,adr);
	map_write32(map,CMD_BLOCK_ERASE_2,adr);

	chip->state = FL_ERASING;

	ret = sharp_do_wait_for_ready(map,chip,adr);
	if(ret<0)return ret;

	map_write32(map,CMD_READ_STATUS,adr);
	status = map_read32(map,adr);

	if(!(status&SR_ERRORS)){
		map_write32(map,CMD_RESET,adr);
		chip->state = FL_READY;
		//spin_unlock_bh(chip->mutex);
		return 0;
	}

	printk("sharp: error erasing block at addr=%08lx status=%08x\n",adr,status);
	map_write32(map,CMD_CLEAR_STATUS,adr);

	//spin_unlock_bh(chip->mutex);

	return -EIO;
}

#ifdef AUTOUNLOCK
static void sharp_unlock_oneblock(struct map_info *map, struct flchip *chip,
	unsigned long adr)
{
	int i;
	int status;

	map_write32(map,CMD_CLEAR_BLOCK_LOCKS_1,adr);
	map_write32(map,CMD_CLEAR_BLOCK_LOCKS_2,adr);

	udelay(100);

	status = map_read32(map,adr);
	printk("status=%08x\n",status);

	for(i=0;i<1000;i++){
		//map_write32(map,CMD_READ_STATUS,adr);
		status = map_read32(map,adr);
		if((status & SR_READY)==SR_READY)
			break;
		udelay(100);
	}
	if(i==1000){
		printk("sharp: timed out unlocking block\n");
	}

	if(!(status&SR_ERRORS)){
		map_write32(map,CMD_RESET,adr);
		chip->state = FL_READY;
		return;
	}

	printk("sharp: error unlocking block at addr=%08lx status=%08x\n",adr,status);
	map_write32(map,CMD_CLEAR_STATUS,adr);
}
#endif

static void sharp_sync(struct mtd_info *mtd)
{
	//printk("sharp_sync()\n");
}

static int sharp_suspend(struct mtd_info *mtd)
{
	printk("sharp_suspend()\n");
	return -EINVAL;
}

static void sharp_resume(struct mtd_info *mtd)
{
	printk("sharp_resume()\n");
	
}

static void sharp_destroy(struct mtd_info *mtd)
{
	printk("sharp_destroy()\n");

}

int __init sharp_probe_init(void)
{
	printk("MTD Sharp chip driver <ds@lineo.com>\n");

	register_mtd_chip_driver(&sharp_chipdrv);

	return 0;
}

static void __exit sharp_probe_exit(void)
{
	unregister_mtd_chip_driver(&sharp_chipdrv);
}

module_init(sharp_probe_init);
module_exit(sharp_probe_exit);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Schleef <ds@schleef.org>");
MODULE_DESCRIPTION("Old MTD chip driver for pre-CFI Sharp flash chips");
OpenPOWER on IntegriCloud