[PATCH v4 5/6] mtd: spi-nor: core: Allow specifying the byte order in DTR mode

[Jaime Liao]

From: JaimeLiao <jaimeliao at mxic.com.tw>

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
controllers are 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 we 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.

Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
Signed-off-by: JaimeLiao <jaimeliao at mxic.com.tw>
---
 drivers/mtd/spi-nor/core.c | 8 ++++++++
 drivers/mtd/spi-nor/core.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 7ee624b16e17..83e7b7ff89ee 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -70,6 +70,13 @@ static u8 spi_nor_get_cmd_ext(const struct spi_nor *nor,
 	}
 }
 
+static inline bool spi_nor_is_octal_dtr_swab16(const struct spi_nor *nor,
+						enum spi_nor_protocol proto)
+{
+	return (proto == SNOR_PROTO_8_8_8_DTR) &&
+		(nor->flags & SNOR_F_DTR_SWAB16);
+}
+
 /**
  * spi_nor_spimem_setup_op() - Set up common properties of a spi-mem op.
  * @nor:		pointer to a 'struct spi_nor'
@@ -105,6 +112,7 @@ void spi_nor_spimem_setup_op(const struct spi_nor *nor,
 		op->addr.dtr = true;
 		op->dummy.dtr = true;
 		op->data.dtr = true;
+		op->data.dtr_swab16 = spi_nor_is_octal_dtr_swab16(nor, proto);
 
 		/* 2 bytes per clock cycle in DTR mode. */
 		op->dummy.nbytes *= 2;
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 92cbc2d3f7fe..7ff4c96fe21e 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -133,6 +133,7 @@ enum spi_nor_option_flags {
 	SNOR_F_RWW		= BIT(14),
 	SNOR_F_ECC		= BIT(15),
 	SNOR_F_NO_WP		= BIT(16),
+	SNOR_F_DTR_SWAB16       = BIT(17),
 };
 
 struct spi_nor_read_command {
-- 
2.25.1