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