diff options
author | Michael Walle <michael@walle.cc> | 2022-08-11 01:06:53 +0300 |
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committer | Tudor Ambarus <tudor.ambarus@microchip.com> | 2022-11-21 16:37:16 +0300 |
commit | 773bbe10449731c9525457873e0c2342e5cf883b (patch) | |
tree | a435d310e5d41d2db99112f7a0a18303a521f0fd /drivers/mtd/spi-nor/sfdp.c | |
parent | 39eece67a3cf027aa5b39d7da5feadc4711504e6 (diff) | |
download | linux-773bbe10449731c9525457873e0c2342e5cf883b.tar.xz |
mtd: spi-nor: add generic flash driver
Our SFDP parsing is everything we need to support all basic operations
of a flash device. If the flash isn't found in our in-kernel flash
database, gracefully fall back to a driver described solely by its SFDP
tables.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Tested-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Link: https://lore.kernel.org/r/20220810220654.1297699-7-michael@walle.cc
Diffstat (limited to 'drivers/mtd/spi-nor/sfdp.c')
-rw-r--r-- | drivers/mtd/spi-nor/sfdp.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c index 15fb7f661ae9..c88628e8ee4e 100644 --- a/drivers/mtd/spi-nor/sfdp.c +++ b/drivers/mtd/spi-nor/sfdp.c @@ -1257,6 +1257,33 @@ static void spi_nor_post_sfdp_fixups(struct spi_nor *nor) } /** + * spi_nor_check_sfdp_signature() - check for a valid SFDP signature + * @nor: pointer to a 'struct spi_nor' + * + * Used to detect if the flash supports the RDSFDP command as well as the + * presence of a valid SFDP table. + * + * Return: 0 on success, -errno otherwise. + */ +int spi_nor_check_sfdp_signature(struct spi_nor *nor) +{ + u32 signature; + int err; + + /* Get the SFDP header. */ + err = spi_nor_read_sfdp_dma_unsafe(nor, 0, sizeof(signature), + &signature); + if (err < 0) + return err; + + /* Check the SFDP signature. */ + if (le32_to_cpu(signature) != SFDP_SIGNATURE) + return -EINVAL; + + return 0; +} + +/** * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters. * @nor: pointer to a 'struct spi_nor' * |