diff options
| author | Michael Walle <michael@walle.cc> | 2022-08-11 00:06:53 +0200 |
|---|---|---|
| committer | Tudor Ambarus <tudor.ambarus@microchip.com> | 2022-11-21 15:37:16 +0200 |
| commit | 773bbe10449731c9525457873e0c2342e5cf883b (patch) | |
| tree | a435d310e5d41d2db99112f7a0a18303a521f0fd /drivers/mtd/spi-nor/core.c | |
| parent | 39eece67a3cf027aa5b39d7da5feadc4711504e6 (diff) | |
| download | linux-773bbe10449731c9525457873e0c2342e5cf883b.tar.bz2 | |
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/core.c')
| -rw-r--r-- | drivers/mtd/spi-nor/core.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 2bdc5b50d8da..71b9bcd8991d 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -1634,6 +1634,16 @@ static const struct spi_nor_manufacturer *manufacturers[] = { &spi_nor_xmc, }; +static const struct flash_info spi_nor_generic_flash = { + .name = "spi-nor-generic", + /* + * JESD216 rev A doesn't specify the page size, therefore we need a + * sane default. + */ + .page_size = 256, + .parse_sfdp = true, +}; + static const struct flash_info *spi_nor_match_id(struct spi_nor *nor, const u8 *id) { @@ -1672,6 +1682,14 @@ static const struct flash_info *spi_nor_detect(struct spi_nor *nor) return ERR_PTR(-ENOMEM); info = spi_nor_match_id(nor, id); + + /* Fallback to a generic flash described only by its SFDP data. */ + if (!info) { + ret = spi_nor_check_sfdp_signature(nor); + if (!ret) + info = &spi_nor_generic_flash; + } + if (!info) { dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n", SPI_NOR_MAX_ID_LEN, id); @@ -2098,8 +2116,12 @@ static int spi_nor_select_pp(struct spi_nor *nor, * spi_nor_select_uniform_erase() - select optimum uniform erase type * @map: the erase map of the SPI NOR * @wanted_size: the erase type size to search for. Contains the value of - * info->sector_size or of the "small sector" size in case - * CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined. + * info->sector_size, the "small sector" size in case + * CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is defined or 0 if + * there is no information about the sector size. The + * latter is the case if the flash parameters are parsed + * solely by SFDP, then the largest supported erase type + * is selected. * * Once the optimum uniform sector erase command is found, disable all the * other. |