Re: [PATCH v2 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash

[Jagan Teki]

On 22 April 2016 at 12:09, Yunhui Cui <B56489@xxxxxxxxxxxxx> wrote:
> From: Yunhui Cui <yunhui.cui@xxxxxxx>
>
> With the physical sectors combination, S25FS-S family flash
> requires some special operations for read/write functions.
>
> Signed-off-by: Yunhui Cui <yunhui.cui@xxxxxxx>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 59 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 157841d..91ee920 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -39,6 +39,10 @@
>
>  #define SPI_NOR_MAX_ID_LEN     6
>  #define SPI_NOR_MAX_ADDR_WIDTH 4
> +/* Added for S25FS-S family flash */
> +#define SPINOR_CONFIG_REG3_OFFSET      0x800004
> +#define CR3V_4KB_ERASE_UNABLE  0x8
> +#define SPINOR_S25FS_FAMILY_ID 0x81
>
>  struct flash_info {
>         char            *name;
> @@ -78,6 +82,7 @@ struct flash_info {
>  };
>
>  #define JEDEC_MFR(info)        ((info)->id[0])
> +#define EXT_ID(info)   ((info)->id[5])

I don't think 5th only the ext and usually last 3 bytes are called as
ext_jedec if the id length is 6 bytes.

>
>  static const struct flash_info *spi_nor_match_id(const char *name);
>
> @@ -881,6 +886,7 @@ static const struct flash_info spi_nor_ids[] = {
>          */
>         { "s25sl032p",  INFO(0x010215, 0x4d00,  64 * 1024,  64, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>         { "s25sl064p",  INFO(0x010216, 0x4d00,  64 * 1024, 128, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> +       { "s25fs256s1", INFO6(0x010219, 0x4d0181, 64 * 1024, 512, 0)},
>         { "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
>         { "s25fl256s1", INFO(0x010219, 0x4d01,  64 * 1024, 512, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>         { "s25fl512s",  INFO(0x010220, 0x4d00, 256 * 1024, 256, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> @@ -1018,6 +1024,53 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
>         return ERR_PTR(-ENODEV);
>  }
>
> +/*
> + * The S25FS-S family physical sectors may be configured as a
> + * hybrid combination of eight 4-kB parameter sectors
> + * at the top or bottom of the address space with all
> + * but one of the remaining sectors being uniform size.
> + * The Parameter Sector Erase commands (20h or 21h) must
> + * be used to erase the 4-kB parameter sectors individually.
> + * The Sector (uniform sector) Erase commands (D8h or DCh)
> + * must be used to erase any of the remaining
> + * sectors, including the portion of highest or lowest address
> + * sector that is not overlaid by the parameter sectors.
> + * The uniform sector erase command has no effect on parameter sectors.
> + */
> +static int spansion_s25fs_disable_4kb_erase(struct spi_nor *nor)
> +{
> +       struct fsl_qspi *q;
> +       u32 cr3v_addr  = SPINOR_CONFIG_REG3_OFFSET;
> +       u8 cr3v = 0x0;
> +       int ret = 0x0;
> +
> +       q = nor->priv;

Why this q?

-- 
Jagan.