summaryrefslogtreecommitdiff
path: root/sfdp.c
blob: bc69dd012d3d006a45484f3fb0ac60561df4c1b1 (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
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2011-2012 Stefan Tauner
 *
 * 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; version 2 of the License.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "flash.h"
#include "spi.h"
#include "chipdrivers.h"

static int spi_sfdp_read_sfdp_chunk(struct flashctx *flash, uint32_t address, uint8_t *buf, int len)
{
	int i, ret;
	uint8_t *newbuf;
	const unsigned char cmd[JEDEC_SFDP_OUTSIZE] = {
		JEDEC_SFDP,
		(address >> 16) & 0xff,
		(address >> 8) & 0xff,
		(address >> 0) & 0xff,
		/* FIXME: the following dummy byte explodes on some programmers.
		 * One workaround is to read the dummy byte
		 * instead and discard its value.
		 */
		0
	};
	msg_cspew("%s: addr=0x%x, len=%d, data:\n", __func__, address, len);
	newbuf = malloc(len + 1);
	if (!newbuf)
		return SPI_PROGRAMMER_ERROR;
	ret = spi_send_command(flash, sizeof(cmd) - 1, len + 1, cmd, newbuf);
	memmove(buf, newbuf + 1, len);
	free(newbuf);
	if (ret)
		return ret;
	for (i = 0; i < len; i++)
		msg_cspew(" 0x%02x", buf[i]);
	msg_cspew("\n");
	return 0;
}

static int spi_sfdp_read_sfdp(struct flashctx *flash, uint32_t address, uint8_t *buf, int len)
{
	/* FIXME: There are different upper bounds for the number of bytes to
	 * read on the various programmers (even depending on the rest of the
	 * structure of the transaction). 2 is a safe bet. */
	int maxstep = 2;
	int ret = 0;
	while (len > 0) {
		int step = min(len, maxstep);
		ret = spi_sfdp_read_sfdp_chunk(flash, address, buf, step);
		if (ret)
			return ret;
		address += step;
		buf += step;
		len -= step;
	}
	return ret;
}

struct sfdp_tbl_hdr {
	uint8_t id;
	uint8_t v_minor;
	uint8_t v_major;
	uint8_t len;
	uint32_t ptp; /* 24b pointer */
};

static int sfdp_add_uniform_eraser(struct flashchip *chip, uint8_t opcode, uint32_t block_size)
{
	int i;
	uint32_t total_size = chip->total_size * 1024;
	erasefunc_t *erasefn = spi_get_erasefn_from_opcode(opcode);

	if (erasefn == NULL || total_size == 0 || block_size == 0 ||
	    total_size % block_size != 0) {
		msg_cdbg("%s: invalid input, please report to "
			 "flashrom@flashrom.org\n", __func__);
		return 1;
	}

	for (i = 0; i < NUM_ERASEFUNCTIONS; i++) {
		struct block_eraser *eraser = &chip->block_erasers[i];
		/* Check for duplicates (including (some) non-uniform ones). */
		if (eraser->eraseblocks[0].size == block_size &&
		    eraser->block_erase == erasefn) {
			msg_cdbg2("  Tried to add a duplicate block eraser: "
				  "%d x %d B with opcode 0x%02x.\n",
				  total_size/block_size, block_size, opcode);
			return 1;
		}
		if (eraser->eraseblocks[0].size != 0 ||
		    eraser->block_erase != NULL) {
			msg_cspew("  Block Eraser %d is already occupied.\n",
				  i);
			continue;
		}

		eraser->block_erase = erasefn;
		eraser->eraseblocks[0].size = block_size;
		eraser->eraseblocks[0].count = total_size/block_size;
		msg_cdbg2("  Block eraser %d: %d x %d B with opcode "
			  "0x%02x\n", i, total_size/block_size, block_size,
			  opcode);
		return 0;
	}
	msg_cinfo("%s: Not enough space to store another eraser (i=%d)."
		  " Please report this at flashrom@flashrom.org\n",
		  __func__, i);
	return 1;
}

static int sfdp_fill_flash(struct flashchip *chip, uint8_t *buf, uint16_t len)
{
	uint8_t opcode_4k_erase = 0xFF;
	uint32_t tmp32;
	uint8_t tmp8;
	uint32_t total_size; /* in bytes */
	uint32_t block_size;
	int j;

	msg_cdbg("Parsing JEDEC flash parameter table... ");
	if (len != 9 * 4 && len != 4 * 4) {
		msg_cdbg("%s: len out of spec\n", __func__);
		return 1;
	}
	msg_cdbg2("\n");
	
	/* 1. double word */
	tmp32 =  ((unsigned int)buf[(4 * 0) + 0]);
	tmp32 |= ((unsigned int)buf[(4 * 0) + 1]) << 8;
	tmp32 |= ((unsigned int)buf[(4 * 0) + 2]) << 16;
	tmp32 |= ((unsigned int)buf[(4 * 0) + 3]) << 24;

	tmp8 = (tmp32 >> 17) & 0x3;
	switch (tmp8) {
	case 0x0:
		msg_cdbg2("  3-Byte only addressing.\n");
		break;
	case 0x1:
		msg_cdbg2("  3-Byte (and optionally 4-Byte) addressing.\n");
		break;
	case 0x2:
		msg_cdbg("  4-Byte only addressing (not supported by "
			 "flashrom).\n");
		return 1;
	default:
		msg_cdbg("  Required addressing mode (0x%x) not supported.\n",
			 tmp8);
		return 1;
	}

	msg_cdbg2("  Status register is ");
	if (tmp32 & (1 << 3)) {
		msg_cdbg2("volatile and writes to the status register have to "
			  "be enabled with ");
		if (tmp32 & (1 << 4)) {
			chip->feature_bits = FEATURE_WRSR_WREN;
			msg_cdbg2("WREN (0x06).\n");
		} else {
			chip->feature_bits = FEATURE_WRSR_EWSR;
			msg_cdbg2("EWSR (0x50).\n");
		}
	} else {
		msg_cdbg2("non-volatile and the standard does not allow "
			  "vendors to tell us whether EWSR/WREN is needed for "
			  "status register writes - assuming EWSR.\n");
			chip->feature_bits = FEATURE_WRSR_EWSR;
		}

	msg_cdbg2("  Write chunk size is ");
	if (tmp32 & (1 << 2)) {
		msg_cdbg2("at least 64 B.\n");
		chip->page_size = 64;
		chip->write = spi_chip_write_256;
	} else {
		msg_cdbg2("1 B only.\n");
		chip->page_size = 256;
		chip->write = spi_chip_write_1;
	}

	if ((tmp32 & 0x3) == 0x1) {
		opcode_4k_erase = (tmp32 >> 8) & 0xFF;
		msg_cspew("  4kB erase opcode is 0x%02x.\n", opcode_4k_erase);
		/* add the eraser later, because we don't know total_size yet */
	} else
		msg_cspew("  4kB erase opcode is not defined.\n");

	/* 2. double word */
	tmp32 =  ((unsigned int)buf[(4 * 1) + 0]);
	tmp32 |= ((unsigned int)buf[(4 * 1) + 1]) << 8;
	tmp32 |= ((unsigned int)buf[(4 * 1) + 2]) << 16;
	tmp32 |= ((unsigned int)buf[(4 * 1) + 3]) << 24;

	if (tmp32 & (1 << 31)) {
		msg_cdbg("Flash chip size >= 4 Gb/512 MB not supported.\n");
		return 1;
	}
	total_size = ((tmp32 & 0x7FFFFFFF) + 1) / 8;
	chip->total_size = total_size / 1024;
	msg_cdbg2("  Flash chip size is %d kB.\n", chip->total_size);
	if (total_size > (1 << 24)) {
		msg_cdbg("Flash chip size is bigger than what 3-Byte addressing "
			 "can access.\n");
		return 1;
	}

	if (opcode_4k_erase != 0xFF)
		sfdp_add_uniform_eraser(chip, opcode_4k_erase, 4 * 1024);

	/* FIXME: double words 3-7 contain unused fast read information */

	if (len == 4 * 4) {
		msg_cdbg("  It seems like this chip supports the preliminary "
			 "Intel version of SFDP, skipping processing of double "
			 "words 3-9.\n");
		goto done;
	}

	/* 8. double word */
	for (j = 0; j < 4; j++) {
		/* 7 double words from the start + 2 bytes for every eraser */
		tmp8 = buf[(4 * 7) + (j * 2)];
		msg_cspew("   Erase Sector Type %d Size: 0x%02x\n", j + 1,
			  tmp8);
		if (tmp8 == 0) {
			msg_cspew("  Erase Sector Type %d is unused.\n", j);
			continue;
		}
		if (tmp8 >= 31) {
			msg_cdbg2("  Block size of erase Sector Type %d (2^%d) "
				 "is too big for flashrom.\n", j, tmp8);
			continue;
		}
		block_size = 1 << (tmp8); /* block_size = 2 ^ field */

		tmp8 = buf[(4 * 7) + (j * 2) + 1];
		msg_cspew("   Erase Sector Type %d Opcode: 0x%02x\n", j + 1,
			  tmp8);
		sfdp_add_uniform_eraser(chip, tmp8, block_size);
	}

done:
	msg_cdbg("done.\n");
	return 0;
}

int probe_spi_sfdp(struct flashctx *flash)
{
	int ret = 0;
	uint8_t buf[8];
	uint32_t tmp32;
	uint8_t nph;
	/* need to limit the table loop by comparing i to uint8_t nph hence: */
	uint16_t i;
	struct sfdp_tbl_hdr *hdrs;
	uint8_t *hbuf;
	uint8_t *tbuf;

	if (spi_sfdp_read_sfdp(flash, 0x00, buf, 4)) {
		msg_cdbg("Receiving SFDP signature failed.\n");
		return 0;
	}
	tmp32 = buf[0];
	tmp32 |= ((unsigned int)buf[1]) << 8;
	tmp32 |= ((unsigned int)buf[2]) << 16;
	tmp32 |= ((unsigned int)buf[3]) << 24;

	if (tmp32 != 0x50444653) {
		msg_cdbg2("Signature = 0x%08x (should be 0x50444653)\n", tmp32);
		msg_cdbg("No SFDP signature found.\n");
		return 0;
	}

	if (spi_sfdp_read_sfdp(flash, 0x04, buf, 3)) {
		msg_cdbg("Receiving SFDP revision and number of parameter "
			 "headers (NPH) failed. ");
		return 0;
	}
	msg_cdbg2("SFDP revision = %d.%d\n", buf[1], buf[0]);
	if (buf[1] != 0x01) {
		msg_cdbg("The chip supports an unknown version of SFDP. "
			  "Aborting SFDP probe!\n");
		return 0;
	}
	nph = buf[2];
	msg_cdbg2("SFDP number of parameter headers is %d (NPH = %d).\n",
		  nph + 1, nph);

	/* Fetch all parameter headers, even if we don't use them all (yet). */
	hbuf = malloc((nph + 1) * 8);
	hdrs = malloc((nph + 1) * sizeof(struct sfdp_tbl_hdr));
	if (hbuf == NULL || hdrs == NULL ) {
		msg_gerr("Out of memory!\n");
		goto cleanup_hdrs;
	}
	if (spi_sfdp_read_sfdp(flash, 0x08, hbuf, (nph + 1) * 8)) {
		msg_cdbg("Receiving SFDP parameter table headers failed.\n");
		goto cleanup_hdrs;
	}

	for (i = 0; i <= nph; i++) {
		uint16_t len;
		hdrs[i].id = hbuf[(8 * i) + 0];
		hdrs[i].v_minor = hbuf[(8 * i) + 1];
		hdrs[i].v_major = hbuf[(8 * i) + 2];
		hdrs[i].len = hbuf[(8 * i) + 3];
		hdrs[i].ptp = hbuf[(8 * i) + 4];
		hdrs[i].ptp |= ((unsigned int)hbuf[(8 * i) + 5]) << 8;
		hdrs[i].ptp |= ((unsigned int)hbuf[(8 * i) + 6]) << 16;
		msg_cdbg2("\nSFDP parameter table header %d/%d:\n", i, nph);
		msg_cdbg2("  ID 0x%02x, version %d.%d\n", hdrs[i].id,
			  hdrs[i].v_major, hdrs[i].v_minor);
		len = hdrs[i].len * 4;
		tmp32 = hdrs[i].ptp;
		msg_cdbg2("  Length %d B, Parameter Table Pointer 0x%06x\n",
			  len, tmp32);

		if (tmp32 + len >= (1 << 24)) {
			msg_cdbg("SFDP Parameter Table %d supposedly overflows "
				  "addressable SFDP area. This most\nprobably "
				  "indicates a corrupt SFDP parameter table "
				  "header. Skipping it.\n", i);
			continue;
		}

		tbuf = malloc(len);
		if (tbuf == NULL) {
			msg_gerr("Out of memory!\n");
			goto cleanup_hdrs;
		}
		if (spi_sfdp_read_sfdp(flash, tmp32, tbuf, len)){
			msg_cdbg("Fetching SFDP parameter table %d failed.\n",
				 i);
			free(tbuf);
			continue;
		}
		msg_cspew("  Parameter table contents:\n");
		for (tmp32 = 0; tmp32 < len; tmp32++) {
			if ((tmp32 % 8) == 0) {
				msg_cspew("    0x%04x: ", tmp32);
			}
			msg_cspew(" %02x", tbuf[tmp32]);
			if ((tmp32 % 8) == 7) {
				msg_cspew("\n");
				continue;
			}
			if ((tmp32 % 8) == 3) {
				msg_cspew(" ");
				continue;
			}
		}
		msg_cspew("\n");

		if (i == 0) { /* Mandatory JEDEC SFDP parameter table */
			if (hdrs[i].id != 0)
				msg_cdbg("ID of the mandatory JEDEC SFDP "
					 "parameter table is not 0 as demanded "
					 "by JESD216 (warning only).\n");

			if (hdrs[i].v_major != 0x01) {
				msg_cdbg("The chip contains an unknown "
					  "version of the JEDEC flash "
					  "parameters table, skipping it.\n");
			} else if (len != 9 * 4 && len != 4 * 4) {
				msg_cdbg("Length of the mandatory JEDEC SFDP "
					 "parameter table is wrong (%d B), "
					 "skipping it.\n", len);
			} else if (sfdp_fill_flash(flash->chip, tbuf, len) == 0)
				ret = 1;
		}
		free(tbuf);
	}

cleanup_hdrs:
	free(hdrs);
	free(hbuf);
	return ret;
}