diff options
| 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 /drivers/mtd/spi-nor/core.h | |
| parent | 069089acf88b2216b667c1e5994e08b4d2e1ea12 (diff) | |
| download | linux-cad3193fe9d1f0af4d05ed86693f99984409b188.tar.bz2 | |
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 'drivers/mtd/spi-nor/core.h')
| -rw-r--r-- | drivers/mtd/spi-nor/core.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index cfbc43c5cc57..e9b6b2e76cdb 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -495,6 +495,7 @@ int spi_nor_read_sr(struct spi_nor *nor, u8 *sr); int spi_nor_read_cr(struct spi_nor *nor, u8 *cr); int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len); int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 sr1); +int spi_nor_write_16bit_cr_and_check(struct spi_nor *nor, u8 cr); int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr); ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len, @@ -502,6 +503,11 @@ ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len, ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len, const u8 *buf); +int spi_nor_otp_read_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf); +int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf); +int spi_nor_otp_lock_sr2(struct spi_nor *nor, unsigned int region); +int spi_nor_otp_is_locked_sr2(struct spi_nor *nor, unsigned int region); + int spi_nor_hwcaps_read2cmd(u32 hwcaps); u8 spi_nor_convert_3to4_read(u8 opcode); void spi_nor_set_read_settings(struct spi_nor_read_command *read, |