summaryrefslogtreecommitdiff
path: root/board/lpd7a40x/flash.c
blob: a3ba75b8938d52d258de46ac54de429e2ad20e25 (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
/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/* #define DEBUG */

#include <common.h>
#include <environment.h>

#define FLASH_BANK_SIZE 0x1000000	/* 16MB (2 x 8 MB) */
#define MAIN_SECT_SIZE  0x40000		/* 256KB (2 x 128kB) */

flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


#define CMD_READ_ARRAY		0x00FF00FF
#define CMD_IDENTIFY		0x00900090
#define CMD_ERASE_SETUP		0x00200020
#define CMD_ERASE_CONFIRM	0x00D000D0
#define CMD_PROGRAM		0x00400040
#define CMD_RESUME		0x00D000D0
#define CMD_SUSPEND		0x00B000B0
#define CMD_STATUS_READ		0x00700070
#define CMD_STATUS_RESET	0x00500050

#define BIT_BUSY		0x00800080
#define BIT_ERASE_SUSPEND	0x00400040
#define BIT_ERASE_ERROR		0x00200020
#define BIT_PROGRAM_ERROR	0x00100010
#define BIT_VPP_RANGE_ERROR	0x00080008
#define BIT_PROGRAM_SUSPEND	0x00040004
#define BIT_PROTECT_ERROR	0x00020002
#define BIT_UNDEFINED		0x00010001

#define BIT_SEQUENCE_ERROR	0x00300030
#define BIT_TIMEOUT		0x80000000

/*-----------------------------------------------------------------------
 */

ulong flash_init (void)
{
	int i, j;
	ulong size = 0;

	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
		ulong flashbase = 0;

		flash_info[i].flash_id =
			(INTEL_MANUFACT     & FLASH_VENDMASK) |
			(INTEL_ID_28F640J3A & FLASH_TYPEMASK);
		flash_info[i].size = FLASH_BANK_SIZE;
		flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
		memset (flash_info[i].protect, 0, CONFIG_SYS_MAX_FLASH_SECT);
		if (i == 0)
			flashbase = CONFIG_SYS_FLASH_BASE;
		else
			panic ("configured too many flash banks!\n");
		for (j = 0; j < flash_info[i].sector_count; j++) {
			flash_info[i].start[j] = flashbase;

			/* uniform sector size */
			flashbase += MAIN_SECT_SIZE;
		}
		size += flash_info[i].size;
	}

	/*
	 * Protect monitor and environment sectors
	 */
	flash_protect ( FLAG_PROTECT_SET,
			CONFIG_SYS_FLASH_BASE,
			CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
			&flash_info[0]);

	flash_protect ( FLAG_PROTECT_SET,
			CONFIG_ENV_ADDR,
			CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1, &flash_info[0]);

#ifdef CONFIG_ENV_ADDR_REDUND
	flash_protect ( FLAG_PROTECT_SET,
			CONFIG_ENV_ADDR_REDUND,
			CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
			&flash_info[0]);
#endif

	return size;
}

/*-----------------------------------------------------------------------
 */
void flash_print_info (flash_info_t * info)
{
	int i;

	switch (info->flash_id & FLASH_VENDMASK) {
	case (INTEL_MANUFACT & FLASH_VENDMASK):
		printf ("Intel: ");
		break;
	default:
		printf ("Unknown Vendor ");
		break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
		printf ("2x 28F640J3A (64Mbit)\n");
		break;
	default:
		printf ("Unknown Chip Type\n");
		return;
		break;
	}

	printf ("  Size: %ld MB in %d Sectors\n",
			info->size >> 20, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i = 0; i < info->sector_count; i++) {
		if ((i % 5) == 0) {
			printf ("\n   ");
		}
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     ");
	}
	printf ("\n");
}

/*-----------------------------------------------------------------------
 */

int flash_error (ulong code)
{
	/* Check bit patterns */
	/* SR.7=0 is busy, SR.7=1 is ready */
	/* all other flags indicate error on 1 */
	/* SR.0 is undefined */
	/* Timeout is our faked flag */

	/* sequence is described in Intel 290644-005 document */

	/* check Timeout */
	if (code & BIT_TIMEOUT) {
		puts ("Timeout\n");
		return ERR_TIMOUT;
	}

	/* check Busy, SR.7 */
	if (~code & BIT_BUSY) {
		puts ("Busy\n");
		return ERR_PROG_ERROR;
	}

	/* check Vpp low, SR.3 */
	if (code & BIT_VPP_RANGE_ERROR) {
		puts ("Vpp range error\n");
		return ERR_PROG_ERROR;
	}

	/* check Device Protect Error, SR.1 */
	if (code & BIT_PROTECT_ERROR) {
		puts ("Device protect error\n");
		return ERR_PROG_ERROR;
	}

	/* check Command Seq Error, SR.4 & SR.5 */
	if (code & BIT_SEQUENCE_ERROR) {
		puts ("Command seqence error\n");
		return ERR_PROG_ERROR;
	}

	/* check Block Erase Error, SR.5 */
	if (code & BIT_ERASE_ERROR) {
		puts ("Block erase error\n");
		return ERR_PROG_ERROR;
	}

	/* check Program Error, SR.4 */
	if (code & BIT_PROGRAM_ERROR) {
		puts ("Program error\n");
		return ERR_PROG_ERROR;
	}

	/* check Block Erase Suspended, SR.6 */
	if (code & BIT_ERASE_SUSPEND) {
		puts ("Block erase suspended\n");
		return ERR_PROG_ERROR;
	}

	/* check Program Suspended, SR.2 */
	if (code & BIT_PROGRAM_SUSPEND) {
		puts ("Program suspended\n");
		return ERR_PROG_ERROR;
	}

	/* OK, no error */
	return ERR_OK;
}

/*-----------------------------------------------------------------------
 */

int flash_erase (flash_info_t * info, int s_first, int s_last)
{
	ulong result, result1;
	int iflag, prot, sect;
	int rc = ERR_OK;

#ifdef USE_920T_MMU
	int cflag;
#endif

	debug ("flash_erase: s_first %d  s_last %d\n", s_first, s_last);

	/* first look for protection bits */

	if (info->flash_id == FLASH_UNKNOWN)
		return ERR_UNKNOWN_FLASH_TYPE;

	if ((s_first < 0) || (s_first > s_last)) {
		return ERR_INVAL;
	}

	if ((info->flash_id & FLASH_VENDMASK) !=
		(INTEL_MANUFACT & FLASH_VENDMASK)) {
		return ERR_UNKNOWN_FLASH_VENDOR;
	}

	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
		if (info->protect[sect]) {
			prot++;
		}
	}

	if (prot) {
		printf ("- Warning: %d protected sectors will not be erased!\n",
			prot);
	} else {
		printf ("\n");
	}

	/*
	 * Disable interrupts which might cause a timeout
	 * here. Remember that our exception vectors are
	 * at address 0 in the flash, and we don't want a
	 * (ticker) exception to happen while the flash
	 * chip is in programming mode.
	 */
#ifdef USE_920T_MMU
	cflag = dcache_status ();
	dcache_disable ();
#endif
	iflag = disable_interrupts ();

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {

		debug ("Erasing sector %2d @ %08lX... ",
			sect, info->start[sect]);

		/* arm simple, non interrupt dependent timer */
		reset_timer_masked();

		if (info->protect[sect] == 0) {	/* not protected */
			vu_long *addr = (vu_long *) (info->start[sect]);
			ulong bsR7, bsR7_2, bsR5, bsR5_2;

			/* *addr = CMD_STATUS_RESET; */
			*addr = CMD_ERASE_SETUP;
			*addr = CMD_ERASE_CONFIRM;

			/* wait until flash is ready */
			do {
				/* check timeout */
				if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
					*addr = CMD_STATUS_RESET;
					result = BIT_TIMEOUT;
					break;
				}

				*addr = CMD_STATUS_READ;
				result = *addr;
				bsR7 = result & (1 << 7);
				bsR7_2 = result & (1 << 23);
			} while (!bsR7 | !bsR7_2);

			*addr = CMD_STATUS_READ;
			result1 = *addr;
			bsR5 = result1 & (1 << 5);
			bsR5_2 = result1 & (1 << 21);
#ifdef SAMSUNG_FLASH_DEBUG
			printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
			if (bsR5 != 0 && bsR5_2 != 0)
				printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
#endif

			*addr = CMD_READ_ARRAY;
			*addr = CMD_RESUME;

			if ((rc = flash_error (result)) != ERR_OK)
				goto outahere;
#if 0
			printf ("ok.\n");
		} else {		/* it was protected */

			printf ("protected!\n");
#endif
		}
	}

outahere:
	/* allow flash to settle - wait 10 ms */
	udelay_masked (10000);

	if (iflag)
		enable_interrupts ();

#ifdef USE_920T_MMU
	if (cflag)
		dcache_enable ();
#endif
	return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash
 */

static int write_word (flash_info_t * info, ulong dest, ulong data)
{
	vu_long *addr = (vu_long *) dest;
	ulong result;
	int rc = ERR_OK;
	int iflag;

#ifdef USE_920T_MMU
	int cflag;
#endif

	/*
	 * Check if Flash is (sufficiently) erased
	 */
	result = *addr;
	if ((result & data) != data)
		return ERR_NOT_ERASED;

	/*
	 * Disable interrupts which might cause a timeout
	 * here. Remember that our exception vectors are
	 * at address 0 in the flash, and we don't want a
	 * (ticker) exception to happen while the flash
	 * chip is in programming mode.
	 */
#ifdef USE_920T_MMU
	cflag = dcache_status ();
	dcache_disable ();
#endif
	iflag = disable_interrupts ();

	/* *addr = CMD_STATUS_RESET; */
	*addr = CMD_PROGRAM;
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	/* wait until flash is ready */
	do {
		/* check timeout */
		if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
			*addr = CMD_SUSPEND;
			result = BIT_TIMEOUT;
			break;
		}

		*addr = CMD_STATUS_READ;
		result = *addr;
	} while (~result & BIT_BUSY);

	/* *addr = CMD_READ_ARRAY; */
	*addr = CMD_STATUS_READ;
	result = *addr;

	rc = flash_error (result);

	if (iflag)
		enable_interrupts ();

#ifdef USE_920T_MMU
	if (cflag)
		dcache_enable ();
#endif
	*addr = CMD_READ_ARRAY;
	*addr = CMD_RESUME;
	return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash.
 */

int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
	ulong cp, wp, data;
	int l;
	int i, rc;

	wp = (addr & ~3);			/* get lower word aligned address */

	/*
	 * handle unaligned start bytes
	 */
	if ((l = addr - wp) != 0) {
		data = 0;
		for (i = 0, cp = wp; i < l; ++i, ++cp) {
			data = (data >> 8) | (*(uchar *) cp << 24);
		}
		for (; i < 4 && cnt > 0; ++i) {
			data = (data >> 8) | (*src++ << 24);
			--cnt;
			++cp;
		}
		for (; cnt == 0 && i < 4; ++i, ++cp) {
			data = (data >> 8) | (*(uchar *) cp << 24);
		}

		if ((rc = write_word (info, wp, data)) != 0) {
			return (rc);
		}
		wp += 4;
	}

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = *((vu_long *) src);
		if ((rc = write_word (info, wp, data)) != 0) {
			return (rc);
		}
		src += 4;
		wp += 4;
		cnt -= 4;
	}

	if (cnt == 0) {
		return ERR_OK;
	}

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
		data = (data >> 8) | (*src++ << 24);
		--cnt;
	}
	for (; i < 4; ++i, ++cp) {
		data = (data >> 8) | (*(uchar *) cp << 24);
	}

	return write_word (info, wp, data);
}