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mtd: spi-nor: Add a post BFPT fixup for MX25L25635E 

MX25L25635F and MX25L25635E share the same JEDEC-ID, but the F variant
supports 4-byte opcodes while the E variant doesn't. We need a way to
differentiate those 2 chips and set the SNOR_F_4B_OPCODES flag only for
the F variant.

Luckily, 4-byte opcode support is not the only difference: Fast Read
4-4-4 is only supported by the F variant, and this feature is
advertised in the BFPT table. Use this to decide when to set the
SNOR_F_4B_OPCODES flag.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
This commit is contained in:
Boris Brezillon 2018-12-06 11:37:36 +01:00
parent 2aaa5f7e0c
commit 2bffa65da4
1 changed files with 28 additions and 1 deletions
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29
drivers/mtd/spi-nor/spi-nor.c
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@ -1447,6 +1447,31 @@ static int macronix_quad_enable(struct spi_nor *nor);
.addr_width = 3, \
.flags = SPI_NOR_NO_FR | SPI_S3AN,
static int
mx25l25635_post_bfpt_fixups(struct spi_nor *nor,
const struct sfdp_parameter_header *bfpt_header,
const struct sfdp_bfpt *bfpt,
struct spi_nor_flash_parameter *params)
{
/*
* MX25L25635F supports 4B opcodes but MX25L25635E does not.
* Unfortunately, Macronix has re-used the same JEDEC ID for both
* variants which prevents us from defining a new entry in the parts
* table.
* We need a way to differentiate MX25L25635E and MX25L25635F, and it
* seems that the F version advertises support for Fast Read 4-4-4 in
* its BFPT table.
*/
if (bfpt->dwords[BFPT_DWORD(5)] & BFPT_DWORD5_FAST_READ_4_4_4)
nor->flags |= SNOR_F_4B_OPCODES;
return 0;
}
static struct spi_nor_fixups mx25l25635_fixups = {
.post_bfpt = mx25l25635_post_bfpt_fixups,
};
/* NOTE: double check command sets and memory organization when you add
* more nor chips. This current list focusses on newer chips, which
* have been converging on command sets which including JEDEC ID.
@ -1581,7 +1606,9 @@ static const struct flash_info spi_nor_ids[] = {
{ "mx25l12855e", INFO(0xc22618, 0, 64 * 1024, 256, 0) },
{ "mx25u12835f", INFO(0xc22538, 0, 64 * 1024, 256,
SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512,
SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
.fixups = &mx25l25635_fixups },
{ "mx25u25635f", INFO(0xc22539, 0, 64 * 1024, 512, SECT_4K | SPI_NOR_4B_OPCODES) },
{ "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
{ "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },