LXR uboot/cmd/mmc

   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
  32static 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
  80usage:
  81        return CMD_RET_USAGE;
  82}
  83
  84U_BOOT_CMD(
  85        mmc_spi,        4,      0,      do_mmc_spi,
  86        "mmc_spi setup",
  87        "[bus:]cs [hz] [mode]   - setup mmc_spi device"
  88);
  89