diff options
| author | Tudor Ambarus <tudor.ambarus@linaro.org> | 2024-09-26 22:19:53 +0800 |
|---|---|---|
| committer | Tudor Ambarus <tudor.ambarus@linaro.org> | 2024-10-02 10:23:56 +0300 |
| commit | 6a42bc97ccda237a54c4ec27aed5fa9c51517d40 (patch) | |
| tree | 515e79c15d6f09cf8fc5eca3488861fb14b7f083 /drivers/mtd | |
| parent | ccac858d2bdb4f6eb97e903744d94f52046e742a (diff) | |
mtd: spi-nor: core: Allow specifying the byte order in Octal DTR mode
Macronix swaps bytes on a 16-bit boundary when configured in Octal DTR.
The byte order of 16-bit words is swapped when read or written in 8D-8D-8D
mode compared to STR modes. Allow operations to specify the byte order in
DTR mode, so that controllers can swap the bytes back at run-time to
address the flash's endianness requirements, if they are capable. If the
controller is not capable of swapping the bytes, the protocol is downgrade
via spi_nor_spimem_adjust_hwcaps(). When available, the swapping of the
bytes is always done regardless if it's a data or register access, so that
it comply with the JESD216 requirements: "Byte order of 16-bit words is
swapped when read in 8D-8D-8D mode compared to 1-1-1".
Merge Tudor's patch and add modifications for suiting newer version
of Linux kernel.
Suggested-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: JaimeLiao <jaimeliao@mxic.com.tw>
Signed-off-by: AlvinZhou <alvinzhou@mxic.com.tw>
Link: https://lore.kernel.org/r/20240926141956.2386374-4-alvinzhou.tw@gmail.com
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/core.c | 3 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/core.h | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 9d6e85bf227b..b6f374ded390 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -113,6 +113,9 @@ void spi_nor_spimem_setup_op(const struct spi_nor *nor, op->cmd.opcode = (op->cmd.opcode << 8) | ext; op->cmd.nbytes = 2; } + + if (proto == SNOR_PROTO_8_8_8_DTR && nor->flags & SNOR_F_SWAP16) + op->data.swap16 = true; } /** diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index 1516b6d0dc37..5c33740ed7f5 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -140,6 +140,7 @@ enum spi_nor_option_flags { SNOR_F_RWW = BIT(14), SNOR_F_ECC = BIT(15), SNOR_F_NO_WP = BIT(16), + SNOR_F_SWAP16 = BIT(17), }; struct spi_nor_read_command { |