cmd/eeprom.c

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