Re: [PATCH v3 1/2] mtd: spi-nor: add macros related to MICRON flash

From: Boris Brezillon
Date: Fri Oct 12 2018 - 02:08:02 EST


On Fri, 12 Oct 2018 02:23:08 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx> wrote:

> Some MICRON related macros in spi-nor domain were ST.
> Rename entries related to STMicroelectronics under macro SNOR_MFR_ST.
>
> Added entry of MFR Id for Micron flashes, 0x002C.
>
> Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@xxxxxxx>
> Reviewed-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> ---
> Changes for v3:
> - None
> Changes for v2:
> - None
>
> drivers/mtd/spi-nor/spi-nor.c | 9 ++++++---
> include/linux/mtd/cfi.h | 1 +
> include/linux/mtd/spi-nor.h | 3 ++-
> 3 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 9407ca5..b8b494f 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -284,6 +284,7 @@ static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
> u8 cmd;
>
> switch (JEDEC_MFR(info)) {
> + case SNOR_MFR_ST:
> case SNOR_MFR_MICRON:
> /* Some Micron need WREN command; all will accept it */
> need_wren = true;
> @@ -1388,7 +1389,7 @@ static int spi_nor_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
> { "mx66l1g45g", INFO(0xc2201b, 0, 64 * 1024, 2048, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> { "mx66l1g55g", INFO(0xc2261b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>
> - /* Micron */
> + /* Micron <--> ST Micro */
> { "n25q016a", INFO(0x20bb15, 0, 64 * 1024, 32, SECT_4K | SPI_NOR_QUAD_READ) },
> { "n25q032", INFO(0x20ba16, 0, 64 * 1024, 64, SPI_NOR_QUAD_READ) },
> { "n25q032a", INFO(0x20bb16, 0, 64 * 1024, 64, SPI_NOR_QUAD_READ) },
> @@ -3223,6 +3224,7 @@ static int spi_nor_init_params(struct spi_nor *nor,
> params->quad_enable = macronix_quad_enable;
> break;
>
> + case SNOR_MFR_ST:
> case SNOR_MFR_MICRON:
> break;
>
> @@ -3671,8 +3673,9 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
> mtd->_resume = spi_nor_resume;
>
> /* NOR protection support for STmicro/Micron chips and similar */
> - if (JEDEC_MFR(info) == SNOR_MFR_MICRON ||
> - info->flags & SPI_NOR_HAS_LOCK) {
> + if (JEDEC_MFR(info) == SNOR_MFR_ST ||
> + JEDEC_MFR(info) == SNOR_MFR_MICRON ||
> + info->flags & SPI_NOR_HAS_LOCK) {
> nor->flash_lock = stm_lock;
> nor->flash_unlock = stm_unlock;
> nor->flash_is_locked = stm_is_locked;

Are you sure ST and Micron NORs work the same way WRT locking, 4-byte
addressing mode and Quad enable?

> diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h
> index 9b57a9b..cbf7716 100644
> --- a/include/linux/mtd/cfi.h
> +++ b/include/linux/mtd/cfi.h
> @@ -377,6 +377,7 @@ struct cfi_fixup {
> #define CFI_MFR_SHARP 0x00B0
> #define CFI_MFR_SST 0x00BF
> #define CFI_MFR_ST 0x0020 /* STMicroelectronics */
> +#define CFI_MFR_MICRON 0x002C /* Micron */
> #define CFI_MFR_TOSHIBA 0x0098
> #define CFI_MFR_WINBOND 0x00DA
>
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index 7f0c730..8b1acf6 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -23,7 +23,8 @@
> #define SNOR_MFR_ATMEL CFI_MFR_ATMEL
> #define SNOR_MFR_GIGADEVICE 0xc8
> #define SNOR_MFR_INTEL CFI_MFR_INTEL
> -#define SNOR_MFR_MICRON CFI_MFR_ST /* ST Micro <--> Micron */
> +#define SNOR_MFR_ST CFI_MFR_ST /* ST Micro */
> +#define SNOR_MFR_MICRON CFI_MFR_MICRON /* Micron */
> #define SNOR_MFR_MACRONIX CFI_MFR_MACRONIX
> #define SNOR_MFR_SPANSION CFI_MFR_AMD
> #define SNOR_MFR_SST CFI_MFR_SST