Eric Lee / smarc-uboot

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cmd/mmc_spi.c 2.08 KB
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d41ce506b   Eric Lee   Initial Release, ... 
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  /*
   * Command for mmc_spi setup.
   *
   * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
   * Licensed under the GPL-2 or later.
   */
  
  #include <common.h>
  #include <mmc.h>
  #include <spi.h>
  
  #ifndef CONFIG_MMC_SPI_BUS
  # define CONFIG_MMC_SPI_BUS 0
  #endif
  #ifndef CONFIG_MMC_SPI_CS
  # define CONFIG_MMC_SPI_CS 1
  #endif
  /* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */
  #ifndef CONFIG_MMC_SPI_SPEED
  # define CONFIG_MMC_SPI_SPEED 25000000
  #endif
  /* MMC and SD specs only seem to care that sampling is on the
   * rising edge ... meaning SPI modes 0 or 3.  So either SPI mode
   * should be legit.  We'll use mode 0 since the steady state is 0,
   * which is appropriate for hotplugging, unless the platform data
   * specify mode 3 (if hardware is not compatible to mode 0).
   */
  #ifndef CONFIG_MMC_SPI_MODE
  # define CONFIG_MMC_SPI_MODE SPI_MODE_0
  #endif
  
  static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  {
  	uint bus = CONFIG_MMC_SPI_BUS;
  	uint cs = CONFIG_MMC_SPI_CS;
  	uint speed = CONFIG_MMC_SPI_SPEED;
  	uint mode = CONFIG_MMC_SPI_MODE;
  	char *endp;
  	struct mmc *mmc;
  
  	if (argc < 2)
  		goto usage;
  
  	cs = simple_strtoul(argv[1], &endp, 0);
  	if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
  		goto usage;
  	if (*endp == ':') {
  		if (endp[1] == 0)
  			goto usage;
  		bus = cs;
  		cs = simple_strtoul(endp + 1, &endp, 0);
  		if (*endp != 0)
  			goto usage;
  	}
  	if (argc >= 3) {
  		speed = simple_strtoul(argv[2], &endp, 0);
  		if (*argv[2] == 0 || *endp != 0)
  			goto usage;
  	}
  	if (argc >= 4) {
  		mode = simple_strtoul(argv[3], &endp, 16);
  		if (*argv[3] == 0 || *endp != 0)
  			goto usage;
  	}
  	if (!spi_cs_is_valid(bus, cs)) {
  		printf("Invalid SPI bus %u cs %u
  ", bus, cs);
  		return 1;
  	}
  
  	mmc = mmc_spi_init(bus, cs, speed, mode);
  	if (!mmc) {
  		printf("Failed to create MMC Device
  ");
  		return 1;
  	}
  	printf("%s: %d at %u:%u hz %u mode %u
  ", mmc->cfg->name,
  	       mmc->block_dev.devnum, bus, cs, speed, mode);
  	mmc_init(mmc);
  	return 0;
  
  usage:
  	return CMD_RET_USAGE;
  }
  
  U_BOOT_CMD(
  	mmc_spi,	4,	0,	do_mmc_spi,
  	"mmc_spi setup",
  	"[bus:]cs [hz] [mode]	- setup mmc_spi device"
  );