cmd/mmc_spi.c

   1 /*
   2  * Command for mmc_spi setup.
   3  *
   4  * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #include <common.h>
   9 #include <mmc.h>
  10 #include <spi.h>
  11
  12 #ifndef CONFIG_MMC_SPI_BUS
  13 # define CONFIG_MMC_SPI_BUS 0
  14 #endif
  15 #ifndef CONFIG_MMC_SPI_CS
  16 # define CONFIG_MMC_SPI_CS 1
  17 #endif
  18 /* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */
  19 #ifndef CONFIG_MMC_SPI_SPEED
  20 # define CONFIG_MMC_SPI_SPEED 25000000
  21 #endif
  22 /* MMC and SD specs only seem to care that sampling is on the
  23  * rising edge ... meaning SPI modes 0 or 3.  So either SPI mode
  24  * should be legit.  We'll use mode 0 since the steady state is 0,
  25  * which is appropriate for hotplugging, unless the platform data
  26  * specify mode 3 (if hardware is not compatible to mode 0).
  27  */
  28 #ifndef CONFIG_MMC_SPI_MODE
  29 # define CONFIG_MMC_SPI_MODE SPI_MODE_0
  30 #endif
  31
  32 static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  33 {
  34         uint bus = CONFIG_MMC_SPI_BUS;
  35         uint cs = CONFIG_MMC_SPI_CS;
  36         uint speed = CONFIG_MMC_SPI_SPEED;
  37         uint mode = CONFIG_MMC_SPI_MODE;
  38         char *endp;
  39         struct mmc *mmc;
  40
  41         if (argc < 2)
  42                 goto usage;
  43
  44         cs = simple_strtoul(argv[1], &endp, 0);
  45         if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
  46                 goto usage;
  47         if (*endp == ':') {
  48                 if (endp[1] == 0)
  49                         goto usage;
  50                 bus = cs;
  51                 cs = simple_strtoul(endp + 1, &endp, 0);
  52                 if (*endp != 0)
  53                         goto usage;
  54         }
  55         if (argc >= 3) {
  56                 speed = simple_strtoul(argv[2], &endp, 0);
  57                 if (*argv[2] == 0 || *endp != 0)
  58                         goto usage;
  59         }
  60         if (argc >= 4) {
  61                 mode = simple_strtoul(argv[3], &endp, 16);
  62                 if (*argv[3] == 0 || *endp != 0)
  63                         goto usage;
  64         }
  65         if (!spi_cs_is_valid(bus, cs)) {
  66                 printf("Invalid SPI bus %u cs %u\n", bus, cs);
  67                 return 1;
  68         }
  69
  70         mmc = mmc_spi_init(bus, cs, speed, mode);
  71         if (!mmc) {
  72                 printf("Failed to create MMC Device\n");
  73                 return 1;
  74         }
  75         printf("%s: %d at %u:%u hz %u mode %u\n", mmc->cfg->name,
  76                mmc->block_dev.devnum, bus, cs, speed, mode);
  77         mmc_init(mmc);
  78         return 0;
  79
  80 usage:
  81         return CMD_RET_USAGE;
  82 }
  83
  84 U_BOOT_CMD(
  85         mmc_spi,        4,      0,      do_mmc_spi,
  86         "mmc_spi setup",
  87         "[bus:]cs [hz] [mode]   - setup mmc_spi device"
  88 );