common/cmd_sf.c

   1 /*
   2  * Command for accessing SPI flash.
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #include <common.h>
   9 #include <spi_flash.h>
  10
  11 #include <asm/io.h>
  12
  13 #ifndef CONFIG_SF_DEFAULT_SPEED
  14 # define CONFIG_SF_DEFAULT_SPEED        1000000
  15 #endif
  16 #ifndef CONFIG_SF_DEFAULT_MODE
  17 # define CONFIG_SF_DEFAULT_MODE         SPI_MODE_3
  18 #endif
  19
  20 static struct spi_flash *flash;
  21
  22 static int do_spi_flash_probe(int argc, char *argv[])
  23 {
  24         unsigned int bus = 0;
  25         unsigned int cs;
  26         unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
  27         unsigned int mode = CONFIG_SF_DEFAULT_MODE;
  28         char *endp;
  29         struct spi_flash *new;
  30
  31         if (argc < 2)
  32                 goto usage;
  33
  34         cs = simple_strtoul(argv[1], &endp, 0);
  35         if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
  36                 goto usage;
  37         if (*endp == ':') {
  38                 if (endp[1] == 0)
  39                         goto usage;
  40
  41                 bus = cs;
  42                 cs = simple_strtoul(endp + 1, &endp, 0);
  43                 if (*endp != 0)
  44                         goto usage;
  45         }
  46
  47         if (argc >= 3) {
  48                 speed = simple_strtoul(argv[2], &endp, 0);
  49                 if (*argv[2] == 0 || *endp != 0)
  50                         goto usage;
  51         }
  52         if (argc >= 4) {
  53                 mode = simple_strtoul(argv[3], &endp, 16);
  54                 if (*argv[3] == 0 || *endp != 0)
  55                         goto usage;
  56         }
  57
  58         new = spi_flash_probe(bus, cs, speed, mode);
  59         if (!new) {
  60                 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
  61                 return 1;
  62         }
  63
  64         if (flash)
  65                 spi_flash_free(flash);
  66         flash = new;
  67
  68         printf("%u KiB %s at %u:%u is now current device\n",
  69                         flash->size >> 10, flash->name, bus, cs);
  70
  71         return 0;
  72
  73 usage:
  74         puts("Usage: sf probe [bus:]cs [hz] [mode]\n");
  75         return 1;
  76 }
  77
  78 static int do_spi_flash_read_write(int argc, char *argv[])
  79 {
  80         unsigned long addr;
  81         unsigned long offset;
  82         unsigned long len;
  83         void *buf;
  84         char *endp;
  85         int ret;
  86
  87         if (argc < 4)
  88                 goto usage;
  89
  90         addr = simple_strtoul(argv[1], &endp, 16);
  91         if (*argv[1] == 0 || *endp != 0)
  92                 goto usage;
  93         offset = simple_strtoul(argv[2], &endp, 16);
  94         if (*argv[2] == 0 || *endp != 0)
  95                 goto usage;
  96         len = simple_strtoul(argv[3], &endp, 16);
  97         if (*argv[3] == 0 || *endp != 0)
  98                 goto usage;
  99
 100         buf = map_physmem(addr, len, MAP_WRBACK);
 101         if (!buf) {
 102                 puts("Failed to map physical memory\n");
 103                 return 1;
 104         }
 105
 106         if (strcmp(argv[0], "read") == 0)
 107                 ret = spi_flash_read(flash, offset, len, buf);
 108         else
 109                 ret = spi_flash_write(flash, offset, len, buf);
 110
 111         unmap_physmem(buf, len);
 112
 113         if (ret) {
 114                 printf("SPI flash %s failed\n", argv[0]);
 115                 return 1;
 116         }
 117
 118         return 0;
 119
 120 usage:
 121         printf("Usage: sf %s addr offset len\n", argv[0]);
 122         return 1;
 123 }
 124
 125 static int do_spi_flash_erase(int argc, char *argv[])
 126 {
 127         unsigned long offset;
 128         unsigned long len;
 129         char *endp;
 130         int ret;
 131
 132         if (argc < 3)
 133                 goto usage;
 134
 135         offset = simple_strtoul(argv[1], &endp, 16);
 136         if (*argv[1] == 0 || *endp != 0)
 137                 goto usage;
 138         len = simple_strtoul(argv[2], &endp, 16);
 139         if (*argv[2] == 0 || *endp != 0)
 140                 goto usage;
 141
 142         ret = spi_flash_erase(flash, offset, len);
 143         if (ret) {
 144                 printf("SPI flash %s failed\n", argv[0]);
 145                 return 1;
 146         }
 147
 148         return 0;
 149
 150 usage:
 151         puts("Usage: sf erase offset len\n");
 152         return 1;
 153 }
 154
 155 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 156 {
 157         const char *cmd;
 158
 159         /* need at least two arguments */
 160         if (argc < 2)
 161                 goto usage;
 162
 163         cmd = argv[1];
 164
 165         if (strcmp(cmd, "probe") == 0)
 166                 return do_spi_flash_probe(argc - 1, argv + 1);
 167
 168         /* The remaining commands require a selected device */
 169         if (!flash) {
 170                 puts("No SPI flash selected. Please run `sf probe'\n");
 171                 return 1;
 172         }
 173
 174         if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0)
 175                 return do_spi_flash_read_write(argc - 1, argv + 1);
 176         if (strcmp(cmd, "erase") == 0)
 177                 return do_spi_flash_erase(argc - 1, argv + 1);
 178
 179 usage:
 180         cmd_usage(cmdtp);
 181         return 1;
 182 }
 183
 184 U_BOOT_CMD(
 185         sf,     5,      1,      do_spi_flash,
 186         "SPI flash sub-system",
 187         "probe [bus:]cs [hz] [mode]     - init flash device on given SPI bus\n"
 188         "                                 and chip select\n"
 189         "sf read addr offset len        - read `len' bytes starting at\n"
 190         "                                 `offset' to memory at `addr'\n"
 191         "sf write addr offset len       - write `len' bytes from memory\n"
 192         "                                 at `addr' to flash at `offset'\n"
 193         "sf erase offset len            - erase `len' bytes from `offset'"
 194 );