summaryrefslogtreecommitdiff
path: root/cmd/eeprom.c
blob: 7b1f81477fd83cd733e3d6d61bcedf95e9fe5189 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000, 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

/*
 * Support for read and write access to EEPROM like memory devices. This
 * includes regular EEPROM as well as  FRAM (ferroelectic nonvolaile RAM).
 * FRAM devices read and write data at bus speed. In particular, there is no
 * write delay. Also, there is no limit imposed on the number of bytes that can
 * be transferred with a single read or write.
 *
 * Use the following configuration options to ensure no unneeded performance
 * degradation (typical for EEPROM) is incured for FRAM memory:
 *
 * #define CONFIG_SYS_I2C_FRAM
 * #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
 *
 */

#include <common.h>
#include <config.h>
#include <command.h>
#include <i2c.h>
#include <eeprom_layout.h>

#ifndef	CONFIG_SYS_I2C_SPEED
#define	CONFIG_SYS_I2C_SPEED	50000
#endif

#ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
#define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS	0
#endif

#ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_BITS
#define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS	8
#endif

#ifndef	I2C_RXTX_LEN
#define I2C_RXTX_LEN	128
#endif

#define	EEPROM_PAGE_SIZE	(1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
#define	EEPROM_PAGE_OFFSET(x)	((x) & (EEPROM_PAGE_SIZE - 1))

/*
 * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
 *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
 *
 * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
 *   0x00000nxx for EEPROM address selectors and page number at n.
 */
#if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
#if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || \
	(CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1) || \
	(CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2)
#error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2
#endif
#endif

#if defined(CONFIG_DM_I2C)
int eeprom_i2c_bus;
#endif

__weak int eeprom_write_enable(unsigned dev_addr, int state)
{
	return 0;
}

void eeprom_init(int bus)
{
	/* I2C EEPROM */
#if defined(CONFIG_DM_I2C)
	eeprom_i2c_bus = bus;
#elif defined(CONFIG_SYS_I2C)
	if (bus >= 0)
		i2c_set_bus_num(bus);
	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
#endif
}

static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr)
{
	unsigned blk_off;
	int alen;

	blk_off = offset & 0xff;	/* block offset */
#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1
	addr[0] = offset >> 8;		/* block number */
	addr[1] = blk_off;		/* block offset */
	alen = 2;
#else
	addr[0] = offset >> 16;		/* block number */
	addr[1] = offset >>  8;		/* upper address octet */
	addr[2] = blk_off;		/* lower address octet */
	alen = 3;
#endif	/* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */

	addr[0] |= dev_addr;		/* insert device address */

	return alen;
}

static int eeprom_len(unsigned offset, unsigned end)
{
	unsigned len = end - offset;

	/*
	 * For a FRAM device there is no limit on the number of the
	 * bytes that can be ccessed with the single read or write
	 * operation.
	 */
#if !defined(CONFIG_SYS_I2C_FRAM)
	unsigned blk_off = offset & 0xff;
	unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);

	if (maxlen > I2C_RXTX_LEN)
		maxlen = I2C_RXTX_LEN;

	if (len > maxlen)
		len = maxlen;
#endif

	return len;
}

static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen,
			   uchar *buffer, unsigned len, bool read)
{
	int ret = 0;

#if defined(CONFIG_DM_I2C)
	struct udevice *dev;

	ret = i2c_get_chip_for_busnum(eeprom_i2c_bus, addr[0],
				      alen - 1, &dev);
	if (ret) {
		printf("%s: Cannot find udev for a bus %d\n", __func__,
		       eeprom_i2c_bus);
		return CMD_RET_FAILURE;
	}

	if (read)
		ret = dm_i2c_read(dev, offset, buffer, len);
	else
		ret = dm_i2c_write(dev, offset, buffer, len);

#else /* Non DM I2C support - will be removed */

	if (read)
		ret = i2c_read(addr[0], offset, alen - 1, buffer, len);
	else
		ret = i2c_write(addr[0], offset, alen - 1, buffer, len);
#endif /* CONFIG_DM_I2C */
	if (ret)
		ret = CMD_RET_FAILURE;

	return ret;
}

static int eeprom_rw(unsigned dev_addr, unsigned offset, uchar *buffer,
		     unsigned cnt, bool read)
{
	unsigned end = offset + cnt;
	unsigned alen, len;
	int rcode = 0;
	uchar addr[3];

#if defined(CONFIG_SYS_I2C_EEPROM_BUS)
	eeprom_init(CONFIG_SYS_I2C_EEPROM_BUS);
#endif

	while (offset < end) {
		alen = eeprom_addr(dev_addr, offset, addr);

		len = eeprom_len(offset, end);

		rcode = eeprom_rw_block(offset, addr, alen, buffer, len, read);

		buffer += len;
		offset += len;

		if (!read)
			udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
	}

	return rcode;
}

int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
{
	/*
	 * Read data until done or would cross a page boundary.
	 * We must write the address again when changing pages
	 * because the next page may be in a different device.
	 */
	return eeprom_rw(dev_addr, offset, buffer, cnt, 1);
}

int eeprom_write(unsigned dev_addr, unsigned offset,
		 uchar *buffer, unsigned cnt)
{
	int ret;

	eeprom_write_enable(dev_addr, 1);

	/*
	 * Write data until done or would cross a write page boundary.
	 * We must write the address again when changing pages
	 * because the address counter only increments within a page.
	 */
	ret = eeprom_rw(dev_addr, offset, buffer, cnt, 0);

	eeprom_write_enable(dev_addr, 0);
	return ret;
}

static int parse_numeric_param(char *str)
{
	char *endptr;
	int value = simple_strtol(str, &endptr, 16);

	return (*endptr != '\0') ? -1 : value;
}

/**
 * parse_i2c_bus_addr - parse the i2c bus and i2c devaddr parameters
 *
 * @i2c_bus:	address to store the i2c bus
 * @i2c_addr:	address to store the device i2c address
 * @argc:	count of command line arguments left to parse
 * @argv:	command line arguments left to parse
 * @argc_no_bus_addr:	argc value we expect to see when bus & addr aren't given
 *
 * @returns:	number of arguments parsed or CMD_RET_USAGE if error
 */
static int parse_i2c_bus_addr(int *i2c_bus, ulong *i2c_addr, int argc,
			      char * const argv[], int argc_no_bus_addr)
{
	int argc_no_bus = argc_no_bus_addr + 1;
	int argc_bus_addr = argc_no_bus_addr + 2;

#ifdef CONFIG_SYS_DEF_EEPROM_ADDR
	if (argc == argc_no_bus_addr) {
		*i2c_bus = -1;
		*i2c_addr = CONFIG_SYS_DEF_EEPROM_ADDR;

		return 0;
	}
#endif
	if (argc == argc_no_bus) {
		*i2c_bus = -1;
		*i2c_addr = parse_numeric_param(argv[0]);

		return 1;
	}

	if (argc == argc_bus_addr) {
		*i2c_bus = parse_numeric_param(argv[0]);
		*i2c_addr = parse_numeric_param(argv[1]);

		return 2;
	}

	return CMD_RET_USAGE;
}

#ifdef CONFIG_CMD_EEPROM_LAYOUT

__weak int eeprom_parse_layout_version(char *str)
{
	return LAYOUT_VERSION_UNRECOGNIZED;
}

static unsigned char eeprom_buf[CONFIG_SYS_EEPROM_SIZE];

#endif

enum eeprom_action {
	EEPROM_READ,
	EEPROM_WRITE,
	EEPROM_PRINT,
	EEPROM_UPDATE,
	EEPROM_ACTION_INVALID,
};

static enum eeprom_action parse_action(char *cmd)
{
	if (!strncmp(cmd, "read", 4))
		return EEPROM_READ;
	if (!strncmp(cmd, "write", 5))
		return EEPROM_WRITE;
#ifdef CONFIG_CMD_EEPROM_LAYOUT
	if (!strncmp(cmd, "print", 5))
		return EEPROM_PRINT;
	if (!strncmp(cmd, "update", 6))
		return EEPROM_UPDATE;
#endif

	return EEPROM_ACTION_INVALID;
}

static int eeprom_execute_command(enum eeprom_action action, int i2c_bus,
				  ulong i2c_addr, int layout_ver, char *key,
				  char *value, ulong addr, ulong off, ulong cnt)
{
	int rcode = 0;
	const char *const fmt =
		"\nEEPROM @0x%lX %s: addr %08lx  off %04lx  count %ld ... ";
#ifdef CONFIG_CMD_EEPROM_LAYOUT
	struct eeprom_layout layout;
#endif

	if (action == EEPROM_ACTION_INVALID)
		return CMD_RET_USAGE;

	eeprom_init(i2c_bus);
	if (action == EEPROM_READ) {
		printf(fmt, i2c_addr, "read", addr, off, cnt);

		rcode = eeprom_read(i2c_addr, off, (uchar *)addr, cnt);

		puts("done\n");
		return rcode;
	} else if (action == EEPROM_WRITE) {
		printf(fmt, i2c_addr, "write", addr, off, cnt);

		rcode = eeprom_write(i2c_addr, off, (uchar *)addr, cnt);

		puts("done\n");
		return rcode;
	}

#ifdef CONFIG_CMD_EEPROM_LAYOUT
	rcode = eeprom_read(i2c_addr, 0, eeprom_buf, CONFIG_SYS_EEPROM_SIZE);
	if (rcode < 0)
		return rcode;

	eeprom_layout_setup(&layout, eeprom_buf, CONFIG_SYS_EEPROM_SIZE,
			    layout_ver);

	if (action == EEPROM_PRINT) {
		layout.print(&layout);
		return 0;
	}

	layout.update(&layout, key, value);

	rcode = eeprom_write(i2c_addr, 0, layout.data, CONFIG_SYS_EEPROM_SIZE);
#endif

	return rcode;
}

#define NEXT_PARAM(argc, index)	{ (argc)--; (index)++; }
int do_eeprom(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int layout_ver = LAYOUT_VERSION_AUTODETECT;
	enum eeprom_action action = EEPROM_ACTION_INVALID;
	int i2c_bus = -1, index = 0;
	ulong i2c_addr = -1, addr = 0, cnt = 0, off = 0;
	int ret;
	char *field_name = "";
	char *field_value = "";

	if (argc <= 1)
		return CMD_RET_USAGE;

	NEXT_PARAM(argc, index); /* Skip program name */

	action = parse_action(argv[index]);
	NEXT_PARAM(argc, index);

	if (action == EEPROM_ACTION_INVALID)
		return CMD_RET_USAGE;

#ifdef CONFIG_CMD_EEPROM_LAYOUT
	if (action == EEPROM_PRINT || action == EEPROM_UPDATE) {
		if (!strcmp(argv[index], "-l")) {
			NEXT_PARAM(argc, index);
			layout_ver = eeprom_parse_layout_version(argv[index]);
			NEXT_PARAM(argc, index);
		}
	}
#endif

	switch (action) {
	case EEPROM_READ:
	case EEPROM_WRITE:
		ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
					 argv + index, 3);
		break;
	case EEPROM_PRINT:
		ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
					 argv + index, 0);
		break;
	case EEPROM_UPDATE:
		ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
					 argv + index, 2);
		break;
	default:
		/* Get compiler to stop whining */
		return CMD_RET_USAGE;
	}

	if (ret == CMD_RET_USAGE)
		return ret;

	while (ret--)
		NEXT_PARAM(argc, index);

	if (action == EEPROM_READ || action == EEPROM_WRITE) {
		addr = parse_numeric_param(argv[index]);
		NEXT_PARAM(argc, index);
		off = parse_numeric_param(argv[index]);
		NEXT_PARAM(argc, index);
		cnt = parse_numeric_param(argv[index]);
	}

#ifdef CONFIG_CMD_EEPROM_LAYOUT
	if (action == EEPROM_UPDATE) {
		field_name = argv[index];
		NEXT_PARAM(argc, index);
		field_value = argv[index];
		NEXT_PARAM(argc, index);
	}
#endif

	return eeprom_execute_command(action, i2c_bus, i2c_addr, layout_ver,
				      field_name, field_value, addr, off, cnt);
}

U_BOOT_CMD(
	eeprom,	8,	1,	do_eeprom,
	"EEPROM sub-system",
	"read  <bus> <devaddr> addr off cnt\n"
	"eeprom write <bus> <devaddr> addr off cnt\n"
	"       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
#ifdef CONFIG_CMD_EEPROM_LAYOUT
	"\n"
	"eeprom print [-l <layout_version>] <bus> <devaddr>\n"
	"       - Print layout fields and their data in human readable format\n"
	"eeprom update [-l <layout_version>] <bus> <devaddr> field_name field_value\n"
	"       - Update a specific eeprom field with new data.\n"
	"         The new data must be written in the same human readable format as shown by the print command.\n"
	"\n"
	"LAYOUT VERSIONS\n"
	"The -l option can be used to force the command to interpret the EEPROM data using the chosen layout.\n"
	"If the -l option is omitted, the command will auto detect the layout based on the data in the EEPROM.\n"
	"The values which can be provided with the -l option are:\n"
	CONFIG_EEPROM_LAYOUT_HELP_STRING"\n"
#endif
)