summaryrefslogtreecommitdiff
path: root/src/drivers/spi/winbond.c
blob: e85f59db03bba07eaffa022c8ea1cf0386db5103 (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
/*
 * This file is part of the coreboot 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.
 */

#include <console/console.h>
#include <commonlib/helpers.h>
#include <spi_flash.h>
#include <spi-generic.h>
#include <string.h>
#include <delay.h>
#include <lib.h>

#include "spi_flash_internal.h"
#include "spi_winbond.h"

union status_reg1_bp3 {
	uint8_t u;
	struct {
		uint8_t busy : 1;
		uint8_t wel  : 1;
		uint8_t bp   : 3;
		uint8_t tb   : 1;
		uint8_t sec  : 1;
		uint8_t srp0 : 1;
	};
};

union status_reg1_bp4 {
	uint8_t u;
	struct {
		uint8_t busy : 1;
		uint8_t wel  : 1;
		uint8_t bp   : 4;
		uint8_t tb   : 1;
		uint8_t srp0 : 1;
	};
};

union status_reg2 {
	uint8_t u;
	struct {
		uint8_t srp1 : 1;
		uint8_t   qe : 1;
		uint8_t  res : 1;
		uint8_t   lb : 3;
		uint8_t  cmp : 1;
		uint8_t  sus : 1;
	};
};

struct status_regs {
	union {
		struct {
#if defined(__BIG_ENDIAN)
			union status_reg2 reg2;
			union {
				union status_reg1_bp3 reg1_bp3;
				union status_reg1_bp4 reg1_bp4;
			};
#else
			union {
				union status_reg1_bp3 reg1_bp3;
				union status_reg1_bp4 reg1_bp4;
			};
			union status_reg2 reg2;
#endif
		};
		u16 u;
	};
};

static const struct spi_flash_part_id flash_table[] = {
	{
		.id				= 0x2014,
		.name				= "W25P80",
		.nr_sectors_shift		= 8,
	},
	{
		.id				= 0x2015,
		.name				= "W25P16",
		.nr_sectors_shift		= 9,
	},
	{
		.id				= 0x2016,
		.name				= "W25P32",
		.nr_sectors_shift		= 10,
	},
	{
		.id				= 0x3014,
		.name				= "W25X80",
		.nr_sectors_shift		= 8,
		.fast_read_dual_output_support	= 1,
	},
	{
		.id				= 0x3015,
		.name				= "W25X16",
		.nr_sectors_shift		= 9,
		.fast_read_dual_output_support	= 1,
	},
	{
		.id				= 0x3016,
		.name				= "W25X32",
		.nr_sectors_shift		= 10,
		.fast_read_dual_output_support	= 1,
	},
	{
		.id				= 0x3017,
		.name				= "W25X64",
		.nr_sectors_shift		= 11,
		.fast_read_dual_output_support	= 1,
	},
	{
		.id				= 0x4014,
		.name				= "W25Q80_V",
		.nr_sectors_shift		= 8,
		.fast_read_dual_output_support	= 1,
	},
	{
		.id				= 0x4015,
		.name				= "W25Q16_V",
		.nr_sectors_shift		= 9,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6015,
		.name				= "W25Q16DW",
		.nr_sectors_shift		= 9,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4016,
		.name				= "W25Q32_V",
		.nr_sectors_shift		= 10,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6016,
		.name				= "W25Q32DW",
		.nr_sectors_shift		= 10,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 16,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4017,
		.name				= "W25Q64_V",
		.nr_sectors_shift		= 11,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 17,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6017,
		.name				= "W25Q64DW",
		.nr_sectors_shift		= 11,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 17,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4018,
		.name				= "W25Q128_V",
		.nr_sectors_shift		= 12,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 18,
		.bp_bits			= 3,
	},
	{
		.id				= 0x6018,
		.name				= "W25Q128FW",
		.nr_sectors_shift		= 12,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 18,
		.bp_bits			= 3,
	},
	{
		.id				= 0x7018,
		.name				= "W25Q128J",
		.nr_sectors_shift		= 12,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 18,
		.bp_bits			= 3,
	},
	{
		.id				= 0x8018,
		.name				= "W25Q128JW",
		.nr_sectors_shift		= 12,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 18,
		.bp_bits			= 3,
	},
	{
		.id				= 0x4019,
		.name				= "W25Q256_V",
		.nr_sectors_shift		= 13,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 16,
		.bp_bits			= 4,
	},
	{
		.id				= 0x7019,
		.name				= "W25Q256J",
		.nr_sectors_shift		= 13,
		.fast_read_dual_output_support	= 1,
		.protection_granularity_shift	= 16,
		.bp_bits			= 4,
	},
};

/*
 * Convert BPx, TB and CMP to a region.
 * SEC (if available) must be zero.
 */
static void winbond_bpbits_to_region(const size_t granularity,
				     const u8 bp,
				     bool tb,
				     const bool cmp,
				     const size_t flash_size,
				     struct region *out)
{
	size_t protected_size =
		MIN(bp ? granularity << (bp - 1) : 0, flash_size);

	if (cmp) {
		protected_size = flash_size - protected_size;
		tb = !tb;
	}

	out->offset = tb ? 0 : flash_size - protected_size;
	out->size = protected_size;
}

/*
 * Available on all devices.
 * Read block protect bits from Status/Status2 Reg.
 * Converts block protection bits to a region.
 *
 * Returns:
 * -1    on error
 *  1    if region is covered by write protection
 *  0    if a part of region isn't covered by write protection
 */
static int winbond_get_write_protection(const struct spi_flash *flash,
					const struct region *region)
{
	const struct spi_flash_part_id *params;
	struct region wp_region;
	union status_reg2 reg2;
	u8 bp, tb;
	int ret;

	params = flash->part;

	if (!params)
		return -1;

	const size_t granularity = (1 << params->protection_granularity_shift);

	if (params->bp_bits == 3) {
		union status_reg1_bp3 reg1_bp3 = { .u = 0 };

		ret = spi_flash_cmd(&flash->spi, flash->status_cmd, &reg1_bp3.u,
				    sizeof(reg1_bp3.u));

		if (reg1_bp3.sec) {
			// FIXME: not supported
			return -1;
		}

		bp = reg1_bp3.bp;
		tb = reg1_bp3.tb;
	} else if (params->bp_bits == 4) {
		union status_reg1_bp4 reg1_bp4 = { .u = 0 };

		ret = spi_flash_cmd(&flash->spi, flash->status_cmd, &reg1_bp4.u,
				    sizeof(reg1_bp4.u));

		bp = reg1_bp4.bp;
		tb = reg1_bp4.tb;
	} else {
		// FIXME: not supported
		return -1;
	}
	if (ret)
		return ret;

	ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR2, &reg2.u,
			    sizeof(reg2.u));
	if (ret)
		return ret;

	winbond_bpbits_to_region(granularity, bp, tb, reg2.cmp, flash->size,
				 &wp_region);

	if (!region_sz(&wp_region)) {
		printk(BIOS_DEBUG, "WINBOND: flash isn't protected\n");

		return 0;
	}

	printk(BIOS_DEBUG, "WINBOND: flash protected range 0x%08zx-0x%08zx\n",
	       region_offset(&wp_region), region_end(&wp_region));

	return region_is_subregion(&wp_region, region);
}

/**
 * Common method to write some bit of the status register 1 & 2 at the same
 * time. Only change bits that are one in @mask.
 * Compare the final result to make sure that the register isn't locked.
 *
 * @param mask: The bits that are affected by @val
 * @param val: The bits to write
 * @param non_volatile: Make setting permanent
 *
 * @return 0 on success
 */
static int winbond_flash_cmd_status(const struct spi_flash *flash,
				    const u16 mask,
				    const u16 val,
				    const bool non_volatile)
{
	struct {
		u8 cmd;
		u16 sreg;
	} __packed cmdbuf;
	u8 reg8;
	int ret;

	if (!flash)
		return -1;

	ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR, &reg8, sizeof(reg8));
	if (ret)
		return ret;

	cmdbuf.sreg = reg8;

	ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR2, &reg8, sizeof(reg8));
	if (ret)
		return ret;

	cmdbuf.sreg |= reg8 << 8;

	if ((val & mask) == (cmdbuf.sreg & mask))
		return 0;

	if (non_volatile) {
		ret = spi_flash_cmd(&flash->spi, CMD_W25_WREN, NULL, 0);
	} else {
		ret = spi_flash_cmd(&flash->spi, CMD_VOLATILE_SREG_WREN, NULL,
				    0);
	}
	if (ret)
		return ret;

	cmdbuf.sreg &= ~mask;
	cmdbuf.sreg |= val & mask;
	cmdbuf.cmd = CMD_W25_WRSR;

	/* Legacy method of writing status register 1 & 2 */
	ret = spi_flash_cmd_write(&flash->spi, (u8 *)&cmdbuf, sizeof(cmdbuf),
				  NULL, 0);
	if (ret)
		return ret;

	if (non_volatile) {
		/* Wait tw */
		ret = spi_flash_cmd_wait_ready(flash, WINBOND_FLASH_TIMEOUT);
		if (ret)
			return ret;
	} else {
		/* Wait tSHSL */
		udelay(1);
	}

	/* Now read the status register to make sure it's not locked */
	ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR, &reg8, sizeof(reg8));
	if (ret)
		return ret;

	cmdbuf.sreg = reg8;

	ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR2, &reg8, sizeof(reg8));
	if (ret)
		return ret;

	cmdbuf.sreg |= reg8 << 8;

	printk(BIOS_DEBUG, "WINBOND: SREG=%02x SREG2=%02x\n",
	       cmdbuf.sreg & 0xff,
	       cmdbuf.sreg >> 8);

	/* Compare against expected result */
	if ((val & mask) != (cmdbuf.sreg & mask)) {
		printk(BIOS_ERR, "WINBOND: SREG is locked!\n");
		ret = -1;
	}

	return ret;
}

/*
 * Available on all devices.
 * Protect a region starting from start of flash or end of flash.
 * The caller must provide a supported protected region size.
 * SEC isn't supported and set to zero.
 * Write block protect bits to Status/Status2 Reg.
 * Optionally lock the status register if lock_sreg is set with the provided
 * mode.
 *
 * @param flash: The flash to operate on
 * @param region: The region to write protect
 * @param non_volatile: Make setting permanent
 * @param mode: Optional status register lock-down mode
 *
 * @return 0 on success
 */
static int
winbond_set_write_protection(const struct spi_flash *flash,
			     const struct region *region,
			     const bool non_volatile,
			     const enum spi_flash_status_reg_lockdown mode)
{
	const struct spi_flash_part_id *params;
	struct status_regs mask, val;
	struct region wp_region;
	u8 cmp, bp, tb;
	int ret;

	/* Need to touch TOP or BOTTOM */
	if (region_offset(region) != 0 && region_end(region) != flash->size)
		return -1;

	params = flash->part;

	if (!params)
		return -1;

	if (params->bp_bits != 3 && params->bp_bits != 4) {
		/* FIXME: not implemented */
		return -1;
	}

	wp_region = *region;

	if (region_offset(&wp_region) == 0)
		tb = 1;
	else
		tb = 0;

	if (region_sz(&wp_region) > flash->size / 2) {
		cmp = 1;
		wp_region.offset = tb ? 0 : region_sz(&wp_region);
		wp_region.size = flash->size - region_sz(&wp_region);
		tb = !tb;
	} else {
		cmp = 0;
	}

	if (region_sz(&wp_region) == 0) {
		bp = 0;
	} else if (IS_POWER_OF_2(region_sz(&wp_region)) &&
		   (region_sz(&wp_region) >=
		    (1 << params->protection_granularity_shift))) {
		bp = log2(region_sz(&wp_region)) -
			  params->protection_granularity_shift + 1;
	} else {
		printk(BIOS_ERR, "WINBOND: ERROR: unsupported region size\n");
		return -1;
	}

	/* Write block protection bits */

	if (params->bp_bits == 3) {
		val.reg1_bp3 = (union status_reg1_bp3) { .bp = bp, .tb = tb,
							.sec = 0 };
		mask.reg1_bp3 = (union status_reg1_bp3) { .bp = ~0, .tb = 1,
							.sec = 1 };
	} else {
		val.reg1_bp4 = (union status_reg1_bp4) { .bp = bp, .tb = tb };
		mask.reg1_bp4 = (union status_reg1_bp4) { .bp = ~0, .tb = 1 };
	}

	val.reg2 = (union status_reg2) { .cmp = cmp };
	mask.reg2 = (union status_reg2) { .cmp = 1 };

	if (mode != SPI_WRITE_PROTECTION_PRESERVE) {
		u8 srp;
		switch (mode) {
		case SPI_WRITE_PROTECTION_NONE:
			srp = 0;
		break;
		case SPI_WRITE_PROTECTION_PIN:
			srp = 1;
		break;
		case SPI_WRITE_PROTECTION_REBOOT:
			srp = 2;
		break;
		case SPI_WRITE_PROTECTION_PERMANENT:
			srp = 3;
		break;
		default:
			return -1;
		}

		if (params->bp_bits == 3) {
			val.reg1_bp3.srp0 = !!(srp & 1);
			mask.reg1_bp3.srp0 = 1;
		} else {
			val.reg1_bp4.srp0 = !!(srp & 1);
			mask.reg1_bp4.srp0 = 1;
		}

		val.reg2.srp1 = !!(srp & 2);
		mask.reg2.srp1 = 1;
	}

	ret = winbond_flash_cmd_status(flash, mask.u, val.u, non_volatile);
	if (ret)
		return ret;

	printk(BIOS_DEBUG, "WINBOND: write-protection set to range "
	       "0x%08zx-0x%08zx\n", region_offset(region), region_end(region));

	return ret;
}

static const struct spi_flash_protection_ops spi_flash_protection_ops = {
	.get_write = winbond_get_write_protection,
	.set_write = winbond_set_write_protection,
};

const struct spi_flash_vendor_info spi_flash_winbond_vi = {
	.id = VENDOR_ID_WINBOND,
	.page_size_shift = 8,
	.sector_size_kib_shift = 2,
	.match_id_mask = 0xffff,
	.ids = flash_table,
	.nr_part_ids = ARRAY_SIZE(flash_table),
	.desc = &spi_flash_pp_0x20_sector_desc,
	.prot_ops = &spi_flash_protection_ops,
};