summaryrefslogtreecommitdiff
path: root/drivers/mtd/spi/spi_flash.c
blob: 6a6fe37e0eea92e27817f47ca6c79c618325612c (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
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
/*
 * SPI flash interface
 *
 * Copyright (C) 2008 Atmel Corporation
 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
 *
 * Licensed under the GPL-2 or later.
 */

#include <common.h>
#include <fdtdec.h>
#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>
#include <watchdog.h>

#include "spi_flash_internal.h"

DECLARE_GLOBAL_DATA_PTR;

static void spi_flash_addr(u32 addr, u8 *cmd)
{
	/* cmd[0] is actual command */
	cmd[1] = addr >> 16;
	cmd[2] = addr >> 8;
	cmd[3] = addr >> 0;
}

static int spi_flash_read_write(struct spi_slave *spi,
				const u8 *cmd, size_t cmd_len,
				const u8 *data_out, u8 *data_in,
				size_t data_len)
{
	unsigned long flags = SPI_XFER_BEGIN;
	int ret;

	if (data_len == 0)
		flags |= SPI_XFER_END;

	ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
	if (ret) {
		debug("SF: Failed to send command (%zu bytes): %d\n",
				cmd_len, ret);
	} else if (data_len != 0) {
		ret = spi_xfer(spi, data_len * 8, data_out, data_in, SPI_XFER_END);
		if (ret)
			debug("SF: Failed to transfer %zu bytes of data: %d\n",
					data_len, ret);
	}

	return ret;
}

int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
{
	return spi_flash_cmd_read(spi, &cmd, 1, response, len);
}

int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
		size_t cmd_len, void *data, size_t data_len)
{
	return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
}

int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
		const void *data, size_t data_len)
{
	return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
}

int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
{
	struct spi_slave *spi = flash->spi;
	unsigned long timebase;
	int ret;
	u8 status;
	u8 check_status = 0x0;
	u8 poll_bit = STATUS_WIP;
	u8 cmd = flash->poll_cmd;

	if (cmd == CMD_FLAG_STATUS) {
		poll_bit = STATUS_PEC;
		check_status = poll_bit;
	}

	ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
	if (ret) {
		debug("SF: fail to read %s status register\n",
			cmd == CMD_READ_STATUS ? "read" : "flag");
		return ret;
	}

	timebase = get_timer(0);
	do {
		WATCHDOG_RESET();

		ret = spi_xfer(spi, 8, NULL, &status, 0);
		if (ret)
			return -1;

		if ((status & poll_bit) == check_status)
			break;

	} while (get_timer(timebase) < timeout);

	spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);

	if ((status & poll_bit) == check_status)
		return 0;

	/* Timed out */
	debug("SF: time out!\n");
	return -1;
}

int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd,
		size_t cmd_len, const void *buf, size_t buf_len)
{
	struct spi_slave *spi = flash->spi;
	unsigned long timeout = SPI_FLASH_PROG_TIMEOUT;
	int ret;

	if (buf == NULL)
		timeout = SPI_FLASH_PAGE_ERASE_TIMEOUT;

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

	ret = spi_flash_cmd_write_enable(flash);
	if (ret < 0) {
		debug("SF: enabling write failed\n");
		return ret;
	}

	ret = spi_flash_cmd_write(spi, cmd, cmd_len, buf, buf_len);
	if (ret < 0) {
		debug("SF: write cmd failed\n");
		return ret;
	}

	ret = spi_flash_cmd_wait_ready(flash, timeout);
	if (ret < 0) {
		debug("SF: write %s timed out\n",
			timeout == SPI_FLASH_PROG_TIMEOUT ?
			"program" : "page erase");
		return ret;
	}

	spi_release_bus(spi);

	return ret;
}

int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
{
	u32 erase_size;
	u8 cmd[4];
	int ret = -1;

	erase_size = flash->sector_size;
	if (offset % erase_size || len % erase_size) {
		debug("SF: Erase offset/length not multiple of erase size\n");
		return -1;
	}

	if (erase_size == 4096)
		cmd[0] = CMD_ERASE_4K;
	else
		cmd[0] = CMD_ERASE_64K;

	while (len) {
#ifdef CONFIG_SPI_FLASH_BAR
		u8 bank_sel;

		bank_sel = offset / SPI_FLASH_16MB_BOUN;

		ret = spi_flash_cmd_bankaddr_write(flash, bank_sel);
		if (ret) {
			debug("SF: fail to set bank%d\n", bank_sel);
			return ret;
		}
#endif
		spi_flash_addr(offset, cmd);

		debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
		      cmd[2], cmd[3], offset);

		ret = spi_flash_write_common(flash, cmd, sizeof(cmd), NULL, 0);
		if (ret < 0) {
			debug("SF: erase failed\n");
			break;
		}

		offset += erase_size;
		len -= erase_size;
	}

	return ret;
}

int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
		size_t len, const void *buf)
{
	unsigned long byte_addr, page_size;
	size_t chunk_len, actual;
	u8 cmd[4];
	int ret = -1;

	page_size = flash->page_size;

	cmd[0] = CMD_PAGE_PROGRAM;
	for (actual = 0; actual < len; actual += chunk_len) {
#ifdef CONFIG_SPI_FLASH_BAR
		u8 bank_sel;

		bank_sel = offset / SPI_FLASH_16MB_BOUN;

		ret = spi_flash_cmd_bankaddr_write(flash, bank_sel);
		if (ret) {
			debug("SF: fail to set bank%d\n", bank_sel);
			return ret;
		}
#endif
		byte_addr = offset % page_size;
		chunk_len = min(len - actual, page_size - byte_addr);

		if (flash->spi->max_write_size)
			chunk_len = min(chunk_len, flash->spi->max_write_size);

		spi_flash_addr(offset, cmd);

		debug("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %zu\n",
		      buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);

		ret = spi_flash_write_common(flash, cmd, sizeof(cmd),
					buf + actual, chunk_len);
		if (ret < 0) {
			debug("SF: write failed\n");
			break;
		}

		offset += chunk_len;
	}

	return ret;
}

int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
		size_t cmd_len, void *data, size_t data_len)
{
	struct spi_slave *spi = flash->spi;
	int ret;

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

	ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
	if (ret < 0) {
		debug("SF: read cmd failed\n");
		return ret;
	}

	spi_release_bus(spi);

	return ret;
}

int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
		size_t len, void *data)
{
	u8 cmd[5], bank_sel = 0;
	u32 remain_len, read_len;
	int ret = -1;

	/* Handle memory-mapped SPI */
	if (flash->memory_map) {
		memcpy(data, flash->memory_map + offset, len);
		return 0;
	}

	cmd[0] = CMD_READ_ARRAY_FAST;
	cmd[4] = 0x00;

	while (len) {
#ifdef CONFIG_SPI_FLASH_BAR
		bank_sel = offset / SPI_FLASH_16MB_BOUN;

		ret = spi_flash_cmd_bankaddr_write(flash, bank_sel);
		if (ret) {
			debug("SF: fail to set bank%d\n", bank_sel);
			return ret;
		}
#endif
		remain_len = (SPI_FLASH_16MB_BOUN * (bank_sel + 1) - offset);
		if (len < remain_len)
			read_len = len;
		else
			read_len = remain_len;

		spi_flash_addr(offset, cmd);

		ret = spi_flash_read_common(flash, cmd, sizeof(cmd),
							data, read_len);
		if (ret < 0) {
			debug("SF: read failed\n");
			break;
		}

		offset += read_len;
		len -= read_len;
		data += read_len;
	}

	return ret;
}

int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
{
	u8 cmd;
	int ret;

	cmd = CMD_WRITE_STATUS;
	ret = spi_flash_write_common(flash, &cmd, 1, &sr, 1);
	if (ret < 0) {
		debug("SF: fail to write status register\n");
		return ret;
	}

	return 0;
}

#ifdef CONFIG_SPI_FLASH_BAR
int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
{
	u8 cmd;
	int ret;

	if (flash->bank_curr == bank_sel) {
		debug("SF: not require to enable bank%d\n", bank_sel);
		return 0;
	}

	cmd = flash->bank_write_cmd;
	ret = spi_flash_write_common(flash, &cmd, 1, &bank_sel, 1);
	if (ret < 0) {
		debug("SF: fail to write bank register\n");
		return ret;
	}
	flash->bank_curr = bank_sel;

	return 0;
}

int spi_flash_bank_config(struct spi_flash *flash, u8 idcode0)
{
	u8 cmd;
	u8 curr_bank = 0;

	/* discover bank cmds */
	switch (idcode0) {
	case SPI_FLASH_SPANSION_IDCODE0:
		flash->bank_read_cmd = CMD_BANKADDR_BRRD;
		flash->bank_write_cmd = CMD_BANKADDR_BRWR;
		break;
	case SPI_FLASH_STMICRO_IDCODE0:
	case SPI_FLASH_WINBOND_IDCODE0:
		flash->bank_read_cmd = CMD_EXTNADDR_RDEAR;
		flash->bank_write_cmd = CMD_EXTNADDR_WREAR;
		break;
	default:
		printf("SF: Unsupported bank commands %02x\n", idcode0);
		return -1;
	}

	/* read the bank reg - on which bank the flash is in currently */
	cmd = flash->bank_read_cmd;
	if (flash->size > SPI_FLASH_16MB_BOUN) {
		if (spi_flash_read_common(flash, &cmd, 1, &curr_bank, 1)) {
			debug("SF: fail to read bank addr register\n");
			return -1;
		}
		flash->bank_curr = curr_bank;
	} else {
		flash->bank_curr = curr_bank;
	}

	return 0;
}
#endif

#ifdef CONFIG_OF_CONTROL
int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash)
{
	fdt_addr_t addr;
	fdt_size_t size;
	int node;

	/* If there is no node, do nothing */
	node = fdtdec_next_compatible(blob, 0, COMPAT_GENERIC_SPI_FLASH);
	if (node < 0)
		return 0;

	addr = fdtdec_get_addr_size(blob, node, "memory-map", &size);
	if (addr == FDT_ADDR_T_NONE) {
		debug("%s: Cannot decode address\n", __func__);
		return 0;
	}

	if (flash->size != size) {
		debug("%s: Memory map must cover entire device\n", __func__);
		return -1;
	}
	flash->memory_map = (void *)addr;

	return 0;
}
#endif /* CONFIG_OF_CONTROL */

/*
 * The following table holds all device probe functions
 *
 * shift:  number of continuation bytes before the ID
 * idcode: the expected IDCODE or 0xff for non JEDEC devices
 * probe:  the function to call
 *
 * Non JEDEC devices should be ordered in the table such that
 * the probe functions with best detection algorithms come first.
 *
 * Several matching entries are permitted, they will be tried
 * in sequence until a probe function returns non NULL.
 *
 * IDCODE_CONT_LEN may be redefined if a device needs to declare a
 * larger "shift" value.  IDCODE_PART_LEN generally shouldn't be
 * changed.  This is the max number of bytes probe functions may
 * examine when looking up part-specific identification info.
 *
 * Probe functions will be given the idcode buffer starting at their
 * manu id byte (the "idcode" in the table below).  In other words,
 * all of the continuation bytes will be skipped (the "shift" below).
 */
#define IDCODE_CONT_LEN 0
#define IDCODE_PART_LEN 5
static const struct {
	const u8 shift;
	const u8 idcode;
	struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
} flashes[] = {
	/* Keep it sorted by define name */
#ifdef CONFIG_SPI_FLASH_ATMEL
	{ 0, 0x1f, spi_flash_probe_atmel, },
#endif
#ifdef CONFIG_SPI_FLASH_EON
	{ 0, 0x1c, spi_flash_probe_eon, },
#endif
#ifdef CONFIG_SPI_FLASH_GIGADEVICE
	{ 0, 0xc8, spi_flash_probe_gigadevice, },
#endif
#ifdef CONFIG_SPI_FLASH_MACRONIX
	{ 0, 0xc2, spi_flash_probe_macronix, },
#endif
#ifdef CONFIG_SPI_FLASH_SPANSION
	{ 0, 0x01, spi_flash_probe_spansion, },
#endif
#ifdef CONFIG_SPI_FLASH_SST
	{ 0, 0xbf, spi_flash_probe_sst, },
#endif
#ifdef CONFIG_SPI_FLASH_STMICRO
	{ 0, 0x20, spi_flash_probe_stmicro, },
#endif
#ifdef CONFIG_SPI_FLASH_WINBOND
	{ 0, 0xef, spi_flash_probe_winbond, },
#endif
#ifdef CONFIG_SPI_FRAM_RAMTRON
	{ 6, 0xc2, spi_fram_probe_ramtron, },
# undef IDCODE_CONT_LEN
# define IDCODE_CONT_LEN 6
#endif
	/* Keep it sorted by best detection */
#ifdef CONFIG_SPI_FLASH_STMICRO
	{ 0, 0xff, spi_flash_probe_stmicro, },
#endif
#ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
	{ 0, 0xff, spi_fram_probe_ramtron, },
#endif
};
#define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)

struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
		unsigned int max_hz, unsigned int spi_mode)
{
	struct spi_slave *spi;
	struct spi_flash *flash = NULL;
	int ret, i, shift;
	u8 idcode[IDCODE_LEN], *idp;

	spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
	if (!spi) {
		printf("SF: Failed to set up slave\n");
		return NULL;
	}

	ret = spi_claim_bus(spi);
	if (ret) {
		debug("SF: Failed to claim SPI bus: %d\n", ret);
		goto err_claim_bus;
	}

	/* Read the ID codes */
	ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
	if (ret)
		goto err_read_id;

#ifdef DEBUG
	printf("SF: Got idcodes\n");
	print_buffer(0, idcode, 1, sizeof(idcode), 0);
#endif

	/* count the number of continuation bytes */
	for (shift = 0, idp = idcode;
	     shift < IDCODE_CONT_LEN && *idp == 0x7f;
	     ++shift, ++idp)
		continue;

	/* search the table for matches in shift and id */
	for (i = 0; i < ARRAY_SIZE(flashes); ++i)
		if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
			/* we have a match, call probe */
			flash = flashes[i].probe(spi, idp);
			if (flash)
				break;
		}

	if (!flash) {
		printf("SF: Unsupported manufacturer %02x\n", *idp);
		goto err_manufacturer_probe;
	}

#ifdef CONFIG_SPI_FLASH_BAR
	/* Configure the BAR - disover bank cmds and read current bank  */
	ret = spi_flash_bank_config(flash, *idp);
	if (ret < 0)
		goto err_manufacturer_probe;
#endif

#ifdef CONFIG_OF_CONTROL
	if (spi_flash_decode_fdt(gd->fdt_blob, flash)) {
		debug("SF: FDT decode error\n");
		goto err_manufacturer_probe;
	}
#endif
	printf("SF: Detected %s with page size ", flash->name);
	print_size(flash->sector_size, ", total ");
	print_size(flash->size, "");
	if (flash->memory_map)
		printf(", mapped at %p", flash->memory_map);
	puts("\n");
#ifndef CONFIG_SPI_FLASH_BAR
	if (flash->size > SPI_FLASH_16MB_BOUN) {
		puts("SF: Warning - Only lower 16MiB accessible,");
		puts(" Full access #define CONFIG_SPI_FLASH_BAR\n");
	}
#endif

	spi_release_bus(spi);

	return flash;

err_manufacturer_probe:
err_read_id:
	spi_release_bus(spi);
err_claim_bus:
	spi_free_slave(spi);
	return NULL;
}

void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
			 const char *name)
{
	struct spi_flash *flash;
	void *ptr;

	ptr = malloc(size);
	if (!ptr) {
		debug("SF: Failed to allocate memory\n");
		return NULL;
	}
	memset(ptr, '\0', size);
	flash = (struct spi_flash *)(ptr + offset);

	/* Set up some basic fields - caller will sort out sizes */
	flash->spi = spi;
	flash->name = name;
	flash->poll_cmd = CMD_READ_STATUS;

	flash->read = spi_flash_cmd_read_fast;
	flash->write = spi_flash_cmd_write_multi;
	flash->erase = spi_flash_cmd_erase;

	return flash;
}

void spi_flash_free(struct spi_flash *flash)
{
	spi_free_slave(flash->spi);
	free(flash);
}