[U-Boot] [PATCH v2 7/7] sf: Add FSR support to spi_flash_cmd_wait_ready

[Marek Vasut <marex@denx.de>]

On Monday, August 17, 2015 at 12:32:54 PM, Jagan Teki wrote:
> This patch adds flag status register reading support to
> spi_flash_cmd_wait_ready.
> 
> Signed-off-by: Jagan Teki <jteki@openedev.com>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Michal Simek <michal.simek@xilinx.com>
> Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
> Cc: Stefan Roese <sr@denx.de>
> Cc: Tom Warren <twarren@nvidia.com>
> Cc: Bin Meng <bmeng.cn@gmail.com>
> Cc: Tom Rini <trini@konsulko.com>
> Cc: Hou Zhiqiang <B48286@freescale.com>
> Tested-by: Jagan Teki <jteki@openedev.com>
> ---
>  drivers/mtd/spi/sf_internal.h |  1 +
>  drivers/mtd/spi/sf_ops.c      | 66
> +++++++++++++++++++++++++++++++++++++++---- drivers/mtd/spi/sf_probe.c   
> |  4 +--
>  include/spi_flash.h           |  2 --
>  4 files changed, 62 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
> index e97c716..4ecfd0c 100644
> --- a/drivers/mtd/spi/sf_internal.h
> +++ b/drivers/mtd/spi/sf_internal.h
> @@ -49,6 +49,7 @@ enum {
> 
>  enum spi_nor_option_flags {
>  	SNOR_F_SST_WR		= (1 << 0),
> +	SNOR_F_USE_FSR		= (1 << 1),
>  };
> 
>  #define SPI_FLASH_3B_ADDR_LEN		3
> diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
> index 7d7c264..a5487ad 100644
> --- a/drivers/mtd/spi/sf_ops.c
> +++ b/drivers/mtd/spi/sf_ops.c
> @@ -40,6 +40,21 @@ int spi_flash_cmd_read_status(struct spi_flash *flash,
> u8 *rs) return 0;
>  }
> 
> +static int read_fsr(struct spi_flash *flash, u8 *fsr)
> +{
> +	int ret;
> +	u8 cmd;
> +
> +	cmd = CMD_FLAG_STATUS;
> +	ret = spi_flash_read_common(flash, &cmd, 1, fsr, 1);
> +	if (ret < 0) {
> +		debug("SF: fail to read flag status register\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  int spi_flash_cmd_write_status(struct spi_flash *flash, u8 ws)
>  {
>  	u8 cmd;
> @@ -138,24 +153,63 @@ static void spi_flash_dual_flash(struct spi_flash
> *flash, u32 *addr) }
>  #endif
> 
> +static inline int spi_flash_sr_ready(struct spi_flash *flash)
> +{
> +	u8 sr;
> +	int ret;
> +
> +	ret = spi_flash_cmd_read_status(flash, &sr);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (sr < 0)

Have you ever seen u8 value that's < 0 ? :-)

> +		return sr;
> +	else
> +		return !(sr & STATUS_WIP);
> +}

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