cmd/eeprom.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000, 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 /*
   8  * Support for read and write access to EEPROM like memory devices. This
   9  * includes regular EEPROM as well as  FRAM (ferroelectic nonvolaile RAM).
  10  * FRAM devices read and write data at bus speed. In particular, there is no
  11  * write delay. Also, there is no limit imposed on the number of bytes that can
  12  * be transferred with a single read or write.
  13  *
  14  * Use the following configuration options to ensure no unneeded performance
  15  * degradation (typical for EEPROM) is incured for FRAM memory:
  16  *
  17  * #define CONFIG_SYS_I2C_FRAM
  18  * #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
  19  *
  20  */
  21
  22 #include <common.h>
  23 #include <config.h>
  24 #include <command.h>
  25 #include <eeprom.h>
  26 #include <i2c.h>
  27 #include <eeprom_layout.h>
  28
  29 #ifndef CONFIG_SYS_I2C_SPEED
  30 #define CONFIG_SYS_I2C_SPEED    50000
  31 #endif
  32
  33 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
  34 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS   0
  35 #endif
  36
  37 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_BITS
  38 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS       8
  39 #endif
  40
  41 #ifndef I2C_RXTX_LEN
  42 #define I2C_RXTX_LEN    128
  43 #endif
  44
  45 #define EEPROM_PAGE_SIZE        (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
  46 #define EEPROM_PAGE_OFFSET(x)   ((x) & (EEPROM_PAGE_SIZE - 1))
  47
  48 /*
  49  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
  50  *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
  51  *
  52  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
  53  *   0x00000nxx for EEPROM address selectors and page number at n.
  54  */
  55 #if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
  56 #if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || \
  57         (CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1) || \
  58         (CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2)
  59 #error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2
  60 #endif
  61 #endif
  62
  63 #if defined(CONFIG_DM_I2C)
  64 static int eeprom_i2c_bus;
  65 #endif
  66
  67 __weak int eeprom_write_enable(unsigned dev_addr, int state)
  68 {
  69         return 0;
  70 }
  71
  72 void eeprom_init(int bus)
  73 {
  74         /* I2C EEPROM */
  75 #if defined(CONFIG_DM_I2C)
  76         eeprom_i2c_bus = bus;
  77 #elif defined(CONFIG_SYS_I2C)
  78         if (bus >= 0)
  79                 i2c_set_bus_num(bus);
  80         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
  81 #endif
  82 }
  83
  84 static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr)
  85 {
  86         unsigned blk_off;
  87         int alen;
  88
  89         blk_off = offset & 0xff;        /* block offset */
  90 #if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1
  91         addr[0] = offset >> 8;          /* block number */
  92         addr[1] = blk_off;              /* block offset */
  93         alen = 2;
  94 #else
  95         addr[0] = offset >> 16;         /* block number */
  96         addr[1] = offset >>  8;         /* upper address octet */
  97         addr[2] = blk_off;              /* lower address octet */
  98         alen = 3;
  99 #endif  /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */
 100
 101         addr[0] |= dev_addr;            /* insert device address */
 102
 103         return alen;
 104 }
 105
 106 static int eeprom_len(unsigned offset, unsigned end)
 107 {
 108         unsigned len = end - offset;
 109
 110         /*
 111          * For a FRAM device there is no limit on the number of the
 112          * bytes that can be accessed with the single read or write
 113          * operation.
 114          */
 115 #if !defined(CONFIG_SYS_I2C_FRAM)
 116         unsigned blk_off = offset & 0xff;
 117         unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
 118
 119         if (maxlen > I2C_RXTX_LEN)
 120                 maxlen = I2C_RXTX_LEN;
 121
 122         if (len > maxlen)
 123                 len = maxlen;
 124 #endif
 125
 126         return len;
 127 }
 128
 129 static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen,
 130                            uchar *buffer, unsigned len, bool read)
 131 {
 132         int ret = 0;
 133
 134 #if defined(CONFIG_DM_I2C)
 135         struct udevice *dev;
 136
 137         ret = i2c_get_chip_for_busnum(eeprom_i2c_bus, addr[0],
 138                                       alen - 1, &dev);
 139         if (ret) {
 140                 printf("%s: Cannot find udev for a bus %d\n", __func__,
 141                        eeprom_i2c_bus);
 142                 return CMD_RET_FAILURE;
 143         }
 144
 145         if (read)
 146                 ret = dm_i2c_read(dev, offset, buffer, len);
 147         else
 148                 ret = dm_i2c_write(dev, offset, buffer, len);
 149
 150 #else /* Non DM I2C support - will be removed */
 151
 152         if (read)
 153                 ret = i2c_read(addr[0], offset, alen - 1, buffer, len);
 154         else
 155                 ret = i2c_write(addr[0], offset, alen - 1, buffer, len);
 156 #endif /* CONFIG_DM_I2C */
 157         if (ret)
 158                 ret = CMD_RET_FAILURE;
 159
 160         return ret;
 161 }
 162
 163 static int eeprom_rw(unsigned dev_addr, unsigned offset, uchar *buffer,
 164                      unsigned cnt, bool read)
 165 {
 166         unsigned end = offset + cnt;
 167         unsigned alen, len;
 168         int rcode = 0;
 169         uchar addr[3];
 170
 171 #if defined(CONFIG_SYS_I2C_EEPROM_BUS)
 172         eeprom_init(CONFIG_SYS_I2C_EEPROM_BUS);
 173 #endif
 174
 175         while (offset < end) {
 176                 alen = eeprom_addr(dev_addr, offset, addr);
 177
 178                 len = eeprom_len(offset, end);
 179
 180                 rcode = eeprom_rw_block(offset, addr, alen, buffer, len, read);
 181
 182                 buffer += len;
 183                 offset += len;
 184
 185                 if (!read)
 186                         udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
 187         }
 188
 189         return rcode;
 190 }
 191
 192 int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
 193 {
 194         /*
 195          * Read data until done or would cross a page boundary.
 196          * We must write the address again when changing pages
 197          * because the next page may be in a different device.
 198          */
 199         return eeprom_rw(dev_addr, offset, buffer, cnt, 1);
 200 }
 201
 202 int eeprom_write(unsigned dev_addr, unsigned offset,
 203                  uchar *buffer, unsigned cnt)
 204 {
 205         int ret;
 206
 207         eeprom_write_enable(dev_addr, 1);
 208
 209         /*
 210          * Write data until done or would cross a write page boundary.
 211          * We must write the address again when changing pages
 212          * because the address counter only increments within a page.
 213          */
 214         ret = eeprom_rw(dev_addr, offset, buffer, cnt, 0);
 215
 216         eeprom_write_enable(dev_addr, 0);
 217         return ret;
 218 }
 219
 220 static int parse_numeric_param(char *str)
 221 {
 222         char *endptr;
 223         int value = simple_strtol(str, &endptr, 16);
 224
 225         return (*endptr != '\0') ? -1 : value;
 226 }
 227
 228 /**
 229  * parse_i2c_bus_addr - parse the i2c bus and i2c devaddr parameters
 230  *
 231  * @i2c_bus:    address to store the i2c bus
 232  * @i2c_addr:   address to store the device i2c address
 233  * @argc:       count of command line arguments left to parse
 234  * @argv:       command line arguments left to parse
 235  * @argc_no_bus_addr:   argc value we expect to see when bus & addr aren't given
 236  *
 237  * @returns:    number of arguments parsed or CMD_RET_USAGE if error
 238  */
 239 static int parse_i2c_bus_addr(int *i2c_bus, ulong *i2c_addr, int argc,
 240                               char *const argv[], int argc_no_bus_addr)
 241 {
 242         int argc_no_bus = argc_no_bus_addr + 1;
 243         int argc_bus_addr = argc_no_bus_addr + 2;
 244
 245 #ifdef CONFIG_SYS_DEF_EEPROM_ADDR
 246         if (argc == argc_no_bus_addr) {
 247                 *i2c_bus = -1;
 248                 *i2c_addr = CONFIG_SYS_DEF_EEPROM_ADDR;
 249
 250                 return 0;
 251         }
 252 #endif
 253         if (argc == argc_no_bus) {
 254                 *i2c_bus = -1;
 255                 *i2c_addr = parse_numeric_param(argv[0]);
 256
 257                 return 1;
 258         }
 259
 260         if (argc == argc_bus_addr) {
 261                 *i2c_bus = parse_numeric_param(argv[0]);
 262                 *i2c_addr = parse_numeric_param(argv[1]);
 263
 264                 return 2;
 265         }
 266
 267         return CMD_RET_USAGE;
 268 }
 269
 270 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 271
 272 __weak int eeprom_parse_layout_version(char *str)
 273 {
 274         return LAYOUT_VERSION_UNRECOGNIZED;
 275 }
 276
 277 static unsigned char eeprom_buf[CONFIG_SYS_EEPROM_SIZE];
 278
 279 #endif
 280
 281 enum eeprom_action {
 282         EEPROM_READ,
 283         EEPROM_WRITE,
 284         EEPROM_PRINT,
 285         EEPROM_UPDATE,
 286         EEPROM_ACTION_INVALID,
 287 };
 288
 289 static enum eeprom_action parse_action(char *cmd)
 290 {
 291         if (!strncmp(cmd, "read", 4))
 292                 return EEPROM_READ;
 293         if (!strncmp(cmd, "write", 5))
 294                 return EEPROM_WRITE;
 295 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 296         if (!strncmp(cmd, "print", 5))
 297                 return EEPROM_PRINT;
 298         if (!strncmp(cmd, "update", 6))
 299                 return EEPROM_UPDATE;
 300 #endif
 301
 302         return EEPROM_ACTION_INVALID;
 303 }
 304
 305 static int eeprom_execute_command(enum eeprom_action action, int i2c_bus,
 306                                   ulong i2c_addr, int layout_ver, char *key,
 307                                   char *value, ulong addr, ulong off, ulong cnt)
 308 {
 309         int rcode = 0;
 310         const char *const fmt =
 311                 "\nEEPROM @0x%lX %s: addr 0x%08lx  off 0x%04lx  count %ld ... ";
 312 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 313         struct eeprom_layout layout;
 314 #endif
 315
 316         if (action == EEPROM_ACTION_INVALID)
 317                 return CMD_RET_USAGE;
 318
 319         eeprom_init(i2c_bus);
 320         if (action == EEPROM_READ) {
 321                 printf(fmt, i2c_addr, "read", addr, off, cnt);
 322
 323                 rcode = eeprom_read(i2c_addr, off, (uchar *)addr, cnt);
 324
 325                 puts("done\n");
 326                 return rcode;
 327         } else if (action == EEPROM_WRITE) {
 328                 printf(fmt, i2c_addr, "write", addr, off, cnt);
 329
 330                 rcode = eeprom_write(i2c_addr, off, (uchar *)addr, cnt);
 331
 332                 puts("done\n");
 333                 return rcode;
 334         }
 335
 336 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 337         rcode = eeprom_read(i2c_addr, 0, eeprom_buf, CONFIG_SYS_EEPROM_SIZE);
 338         if (rcode < 0)
 339                 return rcode;
 340
 341         eeprom_layout_setup(&layout, eeprom_buf, CONFIG_SYS_EEPROM_SIZE,
 342                             layout_ver);
 343
 344         if (action == EEPROM_PRINT) {
 345                 layout.print(&layout);
 346                 return 0;
 347         }
 348
 349         layout.update(&layout, key, value);
 350
 351         rcode = eeprom_write(i2c_addr, 0, layout.data, CONFIG_SYS_EEPROM_SIZE);
 352 #endif
 353
 354         return rcode;
 355 }
 356
 357 #define NEXT_PARAM(argc, index) { (argc)--; (index)++; }
 358 int do_eeprom(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 359 {
 360         int layout_ver = LAYOUT_VERSION_AUTODETECT;
 361         enum eeprom_action action = EEPROM_ACTION_INVALID;
 362         int i2c_bus = -1, index = 0;
 363         ulong i2c_addr = -1, addr = 0, cnt = 0, off = 0;
 364         int ret;
 365         char *field_name = "";
 366         char *field_value = "";
 367
 368         if (argc <= 1)
 369                 return CMD_RET_USAGE;
 370
 371         NEXT_PARAM(argc, index); /* Skip program name */
 372
 373         action = parse_action(argv[index]);
 374         NEXT_PARAM(argc, index);
 375
 376         if (action == EEPROM_ACTION_INVALID)
 377                 return CMD_RET_USAGE;
 378
 379 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 380         if (action == EEPROM_PRINT || action == EEPROM_UPDATE) {
 381                 if (!strcmp(argv[index], "-l")) {
 382                         NEXT_PARAM(argc, index);
 383                         layout_ver = eeprom_parse_layout_version(argv[index]);
 384                         NEXT_PARAM(argc, index);
 385                 }
 386         }
 387 #endif
 388
 389         switch (action) {
 390         case EEPROM_READ:
 391         case EEPROM_WRITE:
 392                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
 393                                          argv + index, 3);
 394                 break;
 395         case EEPROM_PRINT:
 396                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
 397                                          argv + index, 0);
 398                 break;
 399         case EEPROM_UPDATE:
 400                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
 401                                          argv + index, 2);
 402                 break;
 403         default:
 404                 /* Get compiler to stop whining */
 405                 return CMD_RET_USAGE;
 406         }
 407
 408         if (ret == CMD_RET_USAGE)
 409                 return ret;
 410
 411         while (ret--)
 412                 NEXT_PARAM(argc, index);
 413
 414         if (action == EEPROM_READ || action == EEPROM_WRITE) {
 415                 addr = parse_numeric_param(argv[index]);
 416                 NEXT_PARAM(argc, index);
 417                 off = parse_numeric_param(argv[index]);
 418                 NEXT_PARAM(argc, index);
 419                 cnt = parse_numeric_param(argv[index]);
 420         }
 421
 422 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 423         if (action == EEPROM_UPDATE) {
 424                 field_name = argv[index];
 425                 NEXT_PARAM(argc, index);
 426                 field_value = argv[index];
 427                 NEXT_PARAM(argc, index);
 428         }
 429 #endif
 430
 431         return eeprom_execute_command(action, i2c_bus, i2c_addr, layout_ver,
 432                                       field_name, field_value, addr, off, cnt);
 433 }
 434
 435 U_BOOT_CMD(
 436         eeprom, 8,      1,      do_eeprom,
 437         "EEPROM sub-system",
 438         "read  <bus> <devaddr> addr off cnt\n"
 439         "eeprom write <bus> <devaddr> addr off cnt\n"
 440         "       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
 441 #ifdef CONFIG_CMD_EEPROM_LAYOUT
 442         "\n"
 443         "eeprom print [-l <layout_version>] <bus> <devaddr>\n"
 444         "       - Print layout fields and their data in human readable format\n"
 445         "eeprom update [-l <layout_version>] <bus> <devaddr> field_name field_value\n"
 446         "       - Update a specific eeprom field with new data.\n"
 447         "         The new data must be written in the same human readable format as shown by the print command.\n"
 448         "\n"
 449         "LAYOUT VERSIONS\n"
 450         "The -l option can be used to force the command to interpret the EEPROM data using the chosen layout.\n"
 451         "If the -l option is omitted, the command will auto detect the layout based on the data in the EEPROM.\n"
 452         "The values which can be provided with the -l option are:\n"
 453         CONFIG_EEPROM_LAYOUT_HELP_STRING"\n"
 454 #endif
 455 )