[U-Boot] [PATCH] dfu: mmc: Replace calls to u-boot commands with native mmc API

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Lukasz,

> For some time we have been using the run_command() with properly
> crafted string. Such approach turned to be unreliable and error prone.
> 
> Switch to "native" mmc subsystem API would allow better type checking
> and shall improve speed.
> 
> Also, it seems that this API is changing less often than u-boot
> commands. The approach similar to env operations on the eMMC has been
> reused.
> 
> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> ---
>  drivers/dfu/dfu_mmc.c |   31 ++++++++++++++++++++++++-------
>  1 file changed, 24 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
> index 0816f46..651cfff 100644
> --- a/drivers/dfu/dfu_mmc.c
> +++ b/drivers/dfu/dfu_mmc.c
> @@ -12,6 +12,7 @@
>  #include <errno.h>
>  #include <div64.h>
>  #include <dfu.h>
> +#include <mmc.h>
>  
>  static unsigned char __aligned(CONFIG_SYS_CACHELINE_SIZE)
>  				dfu_file_buf[CONFIG_SYS_DFU_MAX_FILE_SIZE];
> @@ -20,8 +21,8 @@ static long dfu_file_buf_len;
>  static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
>  			u64 offset, void *buf, long *len)
>  {
> -	char cmd_buf[DFU_CMD_BUF_SIZE];
> -	u32 blk_start, blk_count;
> +	struct mmc *mmc = find_mmc_device(dfu->dev_num);
> +	u32 blk_start, blk_count, n = 0;
>  
>  	/*
>  	 * We must ensure that we work in lba_blk_size chunks, so
> ALIGN @@ -38,12 +39,28 @@ static int mmc_block_op(enum dfu_op op,
> struct dfu_entity *dfu, return -EINVAL;
>  	}
>  
> -	sprintf(cmd_buf, "mmc %s %p %x %x",
> -		op == DFU_OP_READ ? "read" : "write",
> -		 buf, blk_start, blk_count);
> +	debug("%s: %s dev: %d start: %d cnt: %d buf: 0x%p\n",
> __func__,
> +	      op == DFU_OP_READ ? "MMC READ" : "MMC WRITE",
> dfu->dev_num,
> +	      blk_start, blk_count, buf);
> +	switch (op) {
> +	case DFU_OP_READ:
> +		n = mmc->block_dev.block_read(dfu->dev_num,
> blk_start,
> +					      blk_count, buf);
> +		break;
> +	case DFU_OP_WRITE:
> +		n = mmc->block_dev.block_write(dfu->dev_num,
> blk_start,
> +					       blk_count, buf);
> +		break;
> +	default:
> +		error("Operation not supported\n");
> +	}
>  
> -	debug("%s: %s 0x%p\n", __func__, cmd_buf, cmd_buf);
> -	return run_command(cmd_buf, 0);
> +	if (n != blk_count) {
> +		error("MMC operation failed");
> +		return -EIO;
> +	}
> +
> +	return 0;
>  }
>  
>  static int mmc_file_buffer(struct dfu_entity *dfu, void *buf, long
> *len)

Applied to u-boot-dfu.

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group