linux-kernel - [PATCH 4/4] mtd: spi-nor: core: Introduce SPI_NOR_DTR_BSWAP16 no_sfdp

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Date:   Fri, 18 Feb 2022 16:59:00 +0200
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <p.yadav@...com>, <michael@...le.cc>, <broonie@...nel.org>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <nicolas.ferre@...rochip.com>,
        <zhengxunli@...c.com.tw>, <jaimeliao@...c.com.tw>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH 4/4] mtd: spi-nor: core: Introduce SPI_NOR_DTR_BSWAP16 no_sfdp_flag

Introduce SPI_NOR_DTR_BSWAP16 flag for flashes that don't define the
mandatory BFPT table. When set it indicates that the byte order of 16-bit
words is swapped when read in 8D-8D-8D mode compared to 1-1-1 mode.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/core.c | 5 ++++-
 drivers/mtd/spi-nor/core.h | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 453d8c54d062..c3128a8e1544 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2572,7 +2572,7 @@ static void spi_nor_no_sfdp_init_params(struct spi_nor *nor)
 {
 	struct spi_nor_flash_parameter *params = nor->params;
 	struct spi_nor_erase_map *map = &params->erase_map;
-	const u8 no_sfdp_flags = nor->info->no_sfdp_flags;
+	const u16 no_sfdp_flags = nor->info->no_sfdp_flags;
 	u8 i, erase_mask;
 
 	if (no_sfdp_flags & SPI_NOR_DUAL_READ) {
@@ -2613,6 +2613,9 @@ static void spi_nor_no_sfdp_init_params(struct spi_nor *nor)
 					SPINOR_OP_PP, SNOR_PROTO_8_8_8_DTR);
 	}
 
+	if (no_sfdp_flags & SPI_NOR_DTR_BSWAP16)
+		nor->flags |= SNOR_F_DTR_BSWAP16;
+
 	/*
 	 * Sector Erase settings. Sort Erase Types in ascending order, with the
 	 * smallest erase size starting at BIT(0).
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 7c077d41c335..1cb887437193 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -362,6 +362,8 @@ struct spi_nor_fixups {
  *   SPI_NOR_OCTAL_READ:      flash supports Octal Read.
  *   SPI_NOR_OCTAL_DTR_READ:  flash supports octal DTR Read.
  *   SPI_NOR_OCTAL_DTR_PP:    flash supports Octal DTR Page Program.
+ *   SPI_NOR_DTR_BSWAP16:     the byte order of 16-bit words is swapped when
+ *			      read or written in DTR mode compared to STR mode.
  *
  * @fixup_flags:    flags that indicate support that can be discovered via SFDP
  *                  ideally, but can not be discovered for this particular flash
@@ -404,7 +406,7 @@ struct flash_info {
 #define USE_FSR				BIT(10)
 #define SPI_NOR_XSR_RDY			BIT(11)
 
-	u8 no_sfdp_flags;
+	u16 no_sfdp_flags;
 #define SPI_NOR_SKIP_SFDP		BIT(0)
 #define SECT_4K				BIT(1)
 #define SECT_4K_PMC			BIT(2)
@@ -413,6 +415,7 @@ struct flash_info {
 #define SPI_NOR_OCTAL_READ		BIT(5)
 #define SPI_NOR_OCTAL_DTR_READ		BIT(6)
 #define SPI_NOR_OCTAL_DTR_PP		BIT(7)
+#define SPI_NOR_DTR_BSWAP16		BIT(8)
 
 	u8 fixup_flags;
 #define SPI_NOR_4B_OPCODES		BIT(0)
-- 
2.25.1