[U-Boot] [PATCH v2 7/8] cmd_mmc.c: Add bootbus mmc sub-command

[Jaehoon Chung]

Acked-by: Jaehoon Chung <jh80.chung at samsung.com>

On 01/31/2014 06:31 AM, Tom Rini wrote:
> Add a bootbus sub-command to the mmc command to allow for setting
> the boot_bus_width, reset_boot_bus_width and boot_mode fields of
> BOOT_BUS_WIDTH (EXT_CSD[177]).
> 
> Signed-off-by: Tom Rini <trini at ti.com>
> ---
>  common/cmd_mmc.c  |   29 +++++++++++++++++++++++++++++
>  drivers/mmc/mmc.c |   21 +++++++++++++++++++++
>  include/mmc.h     |    5 +++++
>  3 files changed, 55 insertions(+)
> 
> diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
> index 5842e85..a028149 100644
> --- a/common/cmd_mmc.c
> +++ b/common/cmd_mmc.c
> @@ -338,6 +338,33 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  
>  		/* acknowledge to be sent during boot operation */
>  		return mmc_set_part_conf(mmc, ack, part_num, access);
> +	} else if (strcmp(argv[1], "bootbus") == 0) {
> +		int dev;
> +		struct mmc *mmc;
> +		u8 width, reset, mode;
> +
> +		if (argc == 6) {
> +			dev = simple_strtoul(argv[2], NULL, 10);
> +			width = simple_strtoul(argv[3], NULL, 10);
> +			reset = simple_strtoul(argv[4], NULL, 10);
> +			mode = simple_strtoul(argv[5], NULL, 10);
> +		} else {
> +			return CMD_RET_USAGE;
> +		}
> +
> +		mmc = find_mmc_device(dev);
> +		if (!mmc) {
> +			printf("no mmc device at slot %x\n", dev);
> +			return 1;
> +		}
> +
> +		if (IS_SD(mmc)) {
> +			puts("BOOT_BUS_WIDTH only exists on eMMC\n");
> +			return 1;
> +		}
> +
> +		/* acknowledge to be sent during boot operation */
> +		return mmc_set_boot_bus_width(mmc, width, reset, mode);
>  	} else if (strcmp(argv[1], "bootpart-resize") == 0) {
>  		int dev;
>  		struct mmc *mmc;
> @@ -475,6 +502,8 @@ U_BOOT_CMD(
>  	" - Enable boot_part for booting and enable R/W access of boot_part\n"
>  	"mmc close <dev> <boot_partition>\n"
>  	" - Enable boot_part for booting and disable access to boot_part\n"
> +	"mmc bootbus dev boot_bus_width reset_boot_bus_width boot_mode\n"
> +	" - Set the BOOT_BUS_WIDTH field of the specified device\n"
>  	"mmc bootpart-resize <dev> <boot part size MB> <RPMB part size MB>\n"
>  	" - Change sizes of boot and RPMB partitions of specified device\n"
>  	"mmc partconf dev boot_ack boot_partition partition_access\n"
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
> index 1591fce..fc1c1dc 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -1507,6 +1507,27 @@ int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
>  }
>  
>  /*
> + * Modify EXT_CSD[177] which is BOOT_BUS_WIDTH
> + * based on the passed in values for BOOT_BUS_WIDTH, RESET_BOOT_BUS_WIDTH
> + * and BOOT_MODE.
> + *
> + * Returns 0 on success.
> + */
> +int mmc_set_boot_bus_width(struct mmc *mmc, u8 width, u8 reset, u8 mode)
> +{
> +	int err;
> +
> +	err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_BUS_WIDTH,
> +			 EXT_CSD_BOOT_BUS_WIDTH_MODE(mode) |
> +			 EXT_CSD_BOOT_BUS_WIDTH_RESET(reset) |
> +			 EXT_CSD_BOOT_BUS_WIDTH_WIDTH(width));
> +
> +	if (err)
> +		return err;
> +	return 0;
> +}
> +
> +/*
>   * Modify EXT_CSD[179] which is PARTITION_CONFIG (formerly BOOT_CONFIG)
>   * based on the passed in values for BOOT_ACK, BOOT_PARTITION_ENABLE and
>   * PARTITION_ACCESS.
> diff --git a/include/mmc.h b/include/mmc.h
> index 7e026da..3594286 100644
> --- a/include/mmc.h
> +++ b/include/mmc.h
> @@ -187,6 +187,9 @@
>  #define EXT_CSD_BOOT_PART_NUM(x)	(x << 3)
>  #define EXT_CSD_PARTITION_ACCESS(x)	(x << 0)
>  
> +#define EXT_CSD_BOOT_BUS_WIDTH_MODE(x)	(x << 3)
> +#define EXT_CSD_BOOT_BUS_WIDTH_RESET(x)	(x << 2)
> +#define EXT_CSD_BOOT_BUS_WIDTH_WIDTH(x)	(x)
>  
>  #define R1_ILLEGAL_COMMAND		(1 << 22)
>  #define R1_APP_CMD			(1 << 5)
> @@ -314,6 +317,8 @@ int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
>  int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access);
>  /* Function to modify the PARTITION_CONFIG field of EXT_CSD */
>  int mmc_set_part_conf(struct mmc *mmc, u8 ack, u8 part_num, u8 access);
> +/* Function to modify the BOOT_BUS_WIDTH field of EXT_CSD */
> +int mmc_set_boot_bus_width(struct mmc *mmc, u8 width, u8 reset, u8 mode);
>  
>  /**
>   * Start device initialization and return immediately; it does not block on
>