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SubjectRe: [PATCH v3 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash
On Thu, Aug 18, 2016 at 2:38 AM, Yunhui Cui <B56489@freescale.com> wrote:
> From: Yunhui Cui <yunhui.cui@nxp.com>
>
> With the physical sectors combination, S25FS-S family flash
> requires some special operations for read/write functions.
>
> Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
> ---
> drivers/mtd/spi-nor/spi-nor.c | 56 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 56 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d0fc165..495d0bb 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_EXT_JEDEC 0x81
>
> struct flash_info {
> char *name;
> @@ -78,6 +82,7 @@ struct flash_info {
> };
>
> #define JEDEC_MFR(info) ((info)->id[0])
> +#define EXT_JEDEC(info) ((info)->id[5])
>
> static const struct flash_info *spi_nor_match_id(const char *name);
>
> @@ -899,6 +904,7 @@ 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) },
> @@ -1036,6 +1042,50 @@ 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)
> +{
> + u32 cr3v_addr = SPINOR_CONFIG_REG3_OFFSET;
> + u8 cr3v = 0x0;
> + int ret = 0x0;
> +
> + nor->cmd_buf[2] = cr3v_addr >> 16;
> + nor->cmd_buf[1] = cr3v_addr >> 8;
> + nor->cmd_buf[0] = cr3v_addr >> 0;
> +
> + ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
> + if (ret)
> + return ret;
> + if (cr3v & CR3V_4KB_ERASE_UNABLE)
> + return 0;
> + ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> + if (ret)
> + return ret;
> + cr3v = CR3V_4KB_ERASE_UNABLE;
> + nor->program_opcode = SPINOR_OP_SPANSION_WRAR;
> + nor->write(nor, cr3v_addr, 1, &cr3v);
> +
> + ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
> + if (ret)
> + return ret;
> + if (!(cr3v & CR3V_4KB_ERASE_UNABLE))
> + return -EPERM;
> +
> + return 0;
> +}
> +
> static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
> size_t *retlen, u_char *buf)
> {
> @@ -1361,6 +1411,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
> spi_nor_wait_till_ready(nor);
> }
>
> + if (EXT_JEDEC(info) == SPINOR_S25FS_FAMILY_EXT_JEDEC) {
> + ret = spansion_s25fs_disable_4kb_erase(nor);
> + if (ret)
> + return ret;
> + }
> +
> if (!mtd->name)
> mtd->name = dev_name(dev);
> mtd->priv = nor;
> --
> 2.1.0.27.g96db324
>
>
Hi Brian, I will ack this change but still feel it's kind of hacking code.

Acked-by: Han xu <han.xu@nxp.com>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/



--
Sincerely,

Han XU

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