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| author | Michael Walle <michael@walle.cc> | 2021-03-22 00:51:39 +0100 |
|---|---|---|
| committer | Tudor Ambarus <tudor.ambarus@microchip.com> | 2021-04-02 09:32:27 +0300 |
| commit | cad3193fe9d1f0af4d05ed86693f99984409b188 (patch) | |
| tree | 6de5f8b06449973d82b32de989764d395c4273ba /include/linux | |
| parent | 069089acf88b2216b667c1e5994e08b4d2e1ea12 (diff) | |
| download | linux-cad3193fe9d1f0af4d05ed86693f99984409b188.tar.gz linux-cad3193fe9d1f0af4d05ed86693f99984409b188.tar.bz2 linux-cad3193fe9d1f0af4d05ed86693f99984409b188.zip | |
mtd: spi-nor: implement OTP support for Winbond and similar flashes
Use the new OTP ops to implement OTP access on Winbond flashes. Most
Winbond flashes provides up to four different OTP regions ("Security
Registers").
Winbond devices use a special opcode to read and write to the OTP
regions, just like the RDSFDP opcode. In fact, it seems that the
(undocumented) first OTP area of the newer flashes is the actual SFDP
table.
On a side note, Winbond devices also allow erasing the OTP regions as
long as the area isn't locked down.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20210321235140.8308-3-michael@walle.cc
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mtd/spi-nor.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index a0d572855444..98ed91b529ea 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -107,6 +107,11 @@ #define SPINOR_OP_RD_EVCR 0x65 /* Read EVCR register */ #define SPINOR_OP_WD_EVCR 0x61 /* Write EVCR register */ +/* Used for GigaDevices and Winbond flashes. */ +#define SPINOR_OP_ESECR 0x44 /* Erase Security registers */ +#define SPINOR_OP_PSECR 0x42 /* Program Security registers */ +#define SPINOR_OP_RSECR 0x48 /* Read Security registers */ + /* Status Register bits. */ #define SR_WIP BIT(0) /* Write in progress */ #define SR_WEL BIT(1) /* Write enable latch */ @@ -138,6 +143,9 @@ /* Status Register 2 bits. */ #define SR2_QUAD_EN_BIT1 BIT(1) +#define SR2_LB1 BIT(3) /* Security Register Lock Bit 1 */ +#define SR2_LB2 BIT(4) /* Security Register Lock Bit 2 */ +#define SR2_LB3 BIT(5) /* Security Register Lock Bit 3 */ #define SR2_QUAD_EN_BIT7 BIT(7) /* Supported SPI protocols */ |