summaryrefslogtreecommitdiff
path: root/drivers/mtd/spi/atmel.c
blob: a9910b11b80dc3e1cd9a5137b3d5abaf25edb631 (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
/*
 * Atmel SPI DataFlash support
 *
 * Copyright (C) 2008 Atmel Corporation
 * Licensed under the GPL-2 or later.
 */

#include <common.h>
#include <malloc.h>
#include <spi_flash.h>

#include "spi_flash_internal.h"

/* AT45-specific commands */
#define CMD_AT45_READ_STATUS		0xd7
#define CMD_AT45_ERASE_PAGE		0x81
#define CMD_AT45_LOAD_PROG_BUF1		0x82
#define CMD_AT45_LOAD_BUF1		0x84
#define CMD_AT45_LOAD_PROG_BUF2		0x85
#define CMD_AT45_LOAD_BUF2		0x87
#define CMD_AT45_PROG_BUF1		0x88
#define CMD_AT45_PROG_BUF2		0x89

/* AT45 status register bits */
#define AT45_STATUS_P2_PAGE_SIZE	(1 << 0)
#define AT45_STATUS_READY		(1 << 7)

/* DataFlash family IDs, as obtained from the second idcode byte */
#define DF_FAMILY_AT26F			0
#define DF_FAMILY_AT45			1
#define DF_FAMILY_AT26DF		2	/* AT25DF and AT26DF */

struct atmel_spi_flash_params {
	u8		idcode1;
	/* Log2 of page size in power-of-two mode */
	u8		l2_page_size;
	u8		pages_per_block;
	u8		blocks_per_sector;
	u8		nr_sectors;
	const char	*name;
};

/* spi_flash needs to be first so upper layers can free() it */
struct atmel_spi_flash {
	struct spi_flash flash;
	const struct atmel_spi_flash_params *params;
};

static inline struct atmel_spi_flash *
to_atmel_spi_flash(struct spi_flash *flash)
{
	return container_of(flash, struct atmel_spi_flash, flash);
}

static const struct atmel_spi_flash_params atmel_spi_flash_table[] = {
	{
		.idcode1		= 0x22,
		.l2_page_size		= 8,
		.pages_per_block	= 8,
		.blocks_per_sector	= 16,
		.nr_sectors		= 4,
		.name			= "AT45DB011D",
	},
	{
		.idcode1		= 0x23,
		.l2_page_size		= 8,
		.pages_per_block	= 8,
		.blocks_per_sector	= 16,
		.nr_sectors		= 8,
		.name			= "AT45DB021D",
	},
	{
		.idcode1		= 0x24,
		.l2_page_size		= 8,
		.pages_per_block	= 8,
		.blocks_per_sector	= 32,
		.nr_sectors		= 8,
		.name			= "AT45DB041D",
	},
	{
		.idcode1		= 0x25,
		.l2_page_size		= 8,
		.pages_per_block	= 8,
		.blocks_per_sector	= 32,
		.nr_sectors		= 16,
		.name			= "AT45DB081D",
	},
	{
		.idcode1		= 0x26,
		.l2_page_size		= 9,
		.pages_per_block	= 8,
		.blocks_per_sector	= 32,
		.nr_sectors		= 16,
		.name			= "AT45DB161D",
	},
	{
		.idcode1		= 0x27,
		.l2_page_size		= 9,
		.pages_per_block	= 8,
		.blocks_per_sector	= 64,
		.nr_sectors		= 64,
		.name			= "AT45DB321D",
	},
	{
		.idcode1		= 0x28,
		.l2_page_size		= 10,
		.pages_per_block	= 8,
		.blocks_per_sector	= 32,
		.nr_sectors		= 32,
		.name			= "AT45DB642D",
	},
};

static int at45_wait_ready(struct spi_flash *flash, unsigned long timeout)
{
	return spi_flash_cmd_poll_bit(flash, timeout,
		CMD_AT45_READ_STATUS, AT45_STATUS_READY);
}

/*
 * Assemble the address part of a command for AT45 devices in
 * non-power-of-two page size mode.
 */
static void at45_build_address(struct atmel_spi_flash *asf, u8 *cmd, u32 offset)
{
	unsigned long page_addr;
	unsigned long byte_addr;
	unsigned long page_size;
	unsigned int page_shift;

	/*
	 * The "extra" space per page is the power-of-two page size
	 * divided by 32.
	 */
	page_shift = asf->params->l2_page_size;
	page_size = (1 << page_shift) + (1 << (page_shift - 5));
	page_shift++;
	page_addr = offset / page_size;
	byte_addr = offset % page_size;

	cmd[0] = page_addr >> (16 - page_shift);
	cmd[1] = page_addr << (page_shift - 8) | (byte_addr >> 8);
	cmd[2] = byte_addr;
}

static int dataflash_read_fast_at45(struct spi_flash *flash,
		u32 offset, size_t len, void *buf)
{
	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
	u8 cmd[5];

	cmd[0] = CMD_READ_ARRAY_FAST;
	at45_build_address(asf, cmd + 1, offset);
	cmd[4] = 0x00;

	return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
}

/*
 * TODO: the two write funcs (_p2/_at45) should get unified ...
 */
static int dataflash_write_p2(struct spi_flash *flash,
		u32 offset, size_t len, const void *buf)
{
	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
	unsigned long page_size;
	u32 addr = offset;
	size_t chunk_len;
	size_t actual;
	int ret;
	u8 cmd[4];

	/*
	 * TODO: This function currently uses only page buffer #1.  We can
	 * speed this up by using both buffers and loading one buffer while
	 * the other is being programmed into main memory.
	 */

	page_size = (1 << asf->params->l2_page_size);

	ret = spi_claim_bus(flash->spi);
	if (ret) {
		debug("SF: Unable to claim SPI bus\n");
		return ret;
	}

	for (actual = 0; actual < len; actual += chunk_len) {
		chunk_len = min(len - actual, page_size - (addr % page_size));

		/* Use the same address bits for both commands */
		cmd[0] = CMD_AT45_LOAD_BUF1;
		cmd[1] = addr >> 16;
		cmd[2] = addr >> 8;
		cmd[3] = addr;

		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
				buf + actual, chunk_len);
		if (ret < 0) {
			debug("SF: Loading AT45 buffer failed\n");
			goto out;
		}

		cmd[0] = CMD_AT45_PROG_BUF1;
		ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
		if (ret < 0) {
			debug("SF: AT45 page programming failed\n");
			goto out;
		}

		ret = at45_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
		if (ret < 0) {
			debug("SF: AT45 page programming timed out\n");
			goto out;
		}

		addr += chunk_len;
	}

	debug("SF: AT45: Successfully programmed %zu bytes @ 0x%x\n",
			len, offset);
	ret = 0;

out:
	spi_release_bus(flash->spi);
	return ret;
}

static int dataflash_write_at45(struct spi_flash *flash,
		u32 offset, size_t len, const void *buf)
{
	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
	unsigned long page_addr;
	unsigned long byte_addr;
	unsigned long page_size;
	unsigned int page_shift;
	size_t chunk_len;
	size_t actual;
	int ret;
	u8 cmd[4];

	/*
	 * TODO: This function currently uses only page buffer #1.  We can
	 * speed this up by using both buffers and loading one buffer while
	 * the other is being programmed into main memory.
	 */

	page_shift = asf->params->l2_page_size;
	page_size = (1 << page_shift) + (1 << (page_shift - 5));
	page_shift++;
	page_addr = offset / page_size;
	byte_addr = offset % page_size;

	ret = spi_claim_bus(flash->spi);
	if (ret) {
		debug("SF: Unable to claim SPI bus\n");
		return ret;
	}

	for (actual = 0; actual < len; actual += chunk_len) {
		chunk_len = min(len - actual, page_size - byte_addr);

		/* Use the same address bits for both commands */
		cmd[0] = CMD_AT45_LOAD_BUF1;
		cmd[1] = page_addr >> (16 - page_shift);
		cmd[2] = page_addr << (page_shift - 8) | (byte_addr >> 8);
		cmd[3] = byte_addr;

		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
				buf + actual, chunk_len);
		if (ret < 0) {
			debug("SF: Loading AT45 buffer failed\n");
			goto out;
		}

		cmd[0] = CMD_AT45_PROG_BUF1;
		ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
		if (ret < 0) {
			debug("SF: AT45 page programming failed\n");
			goto out;
		}

		ret = at45_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
		if (ret < 0) {
			debug("SF: AT45 page programming timed out\n");
			goto out;
		}

		page_addr++;
		byte_addr = 0;
	}

	debug("SF: AT45: Successfully programmed %zu bytes @ 0x%x\n",
			len, offset);
	ret = 0;

out:
	spi_release_bus(flash->spi);
	return ret;
}

/*
 * TODO: the two erase funcs (_p2/_at45) should get unified ...
 */
int dataflash_erase_p2(struct spi_flash *flash, u32 offset, size_t len)
{
	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
	unsigned long page_size;

	size_t actual;
	int ret;
	u8 cmd[4];

	/*
	 * TODO: This function currently uses page erase only. We can
	 * probably speed things up by using block and/or sector erase
	 * when possible.
	 */

	page_size = (1 << asf->params->l2_page_size);

	if (offset % page_size || len % page_size) {
		debug("SF: Erase offset/length not multiple of page size\n");
		return -1;
	}

	cmd[0] = CMD_AT45_ERASE_PAGE;
	cmd[3] = 0x00;

	ret = spi_claim_bus(flash->spi);
	if (ret) {
		debug("SF: Unable to claim SPI bus\n");
		return ret;
	}

	for (actual = 0; actual < len; actual += page_size) {
		cmd[1] = offset >> 16;
		cmd[2] = offset >> 8;

		ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
		if (ret < 0) {
			debug("SF: AT45 page erase failed\n");
			goto out;
		}

		ret = at45_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
		if (ret < 0) {
			debug("SF: AT45 page erase timed out\n");
			goto out;
		}

		offset += page_size;
	}

	debug("SF: AT45: Successfully erased %zu bytes @ 0x%x\n",
			len, offset);
	ret = 0;

out:
	spi_release_bus(flash->spi);
	return ret;
}

int dataflash_erase_at45(struct spi_flash *flash, u32 offset, size_t len)
{
	struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
	unsigned long page_addr;
	unsigned long page_size;
	unsigned int page_shift;
	size_t actual;
	int ret;
	u8 cmd[4];

	/*
	 * TODO: This function currently uses page erase only. We can
	 * probably speed things up by using block and/or sector erase
	 * when possible.
	 */

	page_shift = asf->params->l2_page_size;
	page_size = (1 << page_shift) + (1 << (page_shift - 5));
	page_shift++;
	page_addr = offset / page_size;

	if (offset % page_size || len % page_size) {
		debug("SF: Erase offset/length not multiple of page size\n");
		return -1;
	}

	cmd[0] = CMD_AT45_ERASE_PAGE;
	cmd[3] = 0x00;

	ret = spi_claim_bus(flash->spi);
	if (ret) {
		debug("SF: Unable to claim SPI bus\n");
		return ret;
	}

	for (actual = 0; actual < len; actual += page_size) {
		cmd[1] = page_addr >> (16 - page_shift);
		cmd[2] = page_addr << (page_shift - 8);

		ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
		if (ret < 0) {
			debug("SF: AT45 page erase failed\n");
			goto out;
		}

		ret = at45_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
		if (ret < 0) {
			debug("SF: AT45 page erase timed out\n");
			goto out;
		}

		page_addr++;
	}

	debug("SF: AT45: Successfully erased %zu bytes @ 0x%x\n",
			len, offset);
	ret = 0;

out:
	spi_release_bus(flash->spi);
	return ret;
}

struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode)
{
	const struct atmel_spi_flash_params *params;
	unsigned page_size;
	unsigned int family;
	struct atmel_spi_flash *asf;
	unsigned int i;
	int ret;
	u8 status;

	for (i = 0; i < ARRAY_SIZE(atmel_spi_flash_table); i++) {
		params = &atmel_spi_flash_table[i];
		if (params->idcode1 == idcode[1])
			break;
	}

	if (i == ARRAY_SIZE(atmel_spi_flash_table)) {
		debug("SF: Unsupported DataFlash ID %02x\n",
				idcode[1]);
		return NULL;
	}

	asf = malloc(sizeof(struct atmel_spi_flash));
	if (!asf) {
		debug("SF: Failed to allocate memory\n");
		return NULL;
	}

	asf->params = params;
	asf->flash.spi = spi;
	asf->flash.name = params->name;

	/* Assuming power-of-two page size initially. */
	page_size = 1 << params->l2_page_size;

	family = idcode[1] >> 5;

	switch (family) {
	case DF_FAMILY_AT45:
		/*
		 * AT45 chips have configurable page size. The status
		 * register indicates which configuration is active.
		 */
		ret = spi_flash_cmd(spi, CMD_AT45_READ_STATUS, &status, 1);
		if (ret)
			goto err;

		debug("SF: AT45 status register: %02x\n", status);

		if (!(status & AT45_STATUS_P2_PAGE_SIZE)) {
			asf->flash.read = dataflash_read_fast_at45;
			asf->flash.write = dataflash_write_at45;
			asf->flash.erase = dataflash_erase_at45;
			page_size += 1 << (params->l2_page_size - 5);
		} else {
			asf->flash.read = spi_flash_cmd_read_fast;
			asf->flash.write = dataflash_write_p2;
			asf->flash.erase = dataflash_erase_p2;
		}

		break;

	case DF_FAMILY_AT26F:
	case DF_FAMILY_AT26DF:
		asf->flash.read = spi_flash_cmd_read_fast;
		break;

	default:
		debug("SF: Unsupported DataFlash family %u\n", family);
		goto err;
	}

	asf->flash.size = page_size * params->pages_per_block
				* params->blocks_per_sector
				* params->nr_sectors;

	printf("SF: Detected %s with page size %u, total ",
	       params->name, page_size);
	print_size(asf->flash.size, "\n");

	return &asf->flash;

err:
	free(asf);
	return NULL;
}