[PATCH v8 13/15] mtd: spi-nor-core: Add Cypress manufacturer ID in set_4byte

tkuw584924 at gmail.com tkuw584924 at gmail.com
Mon May 3 23:42:36 CEST 2021


From: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>

Cypress chips support SPINOR_OP_EN4B(B7h) to enable 4-byte addressing mode.

Cypress chips support B8h to disable 4-byte addressing mode instead of
SPINOR_OP_EX4B(E9h).

This patch defines new opcode and updates set_4byte() to support
enable/disable 4-byte addressing mode for Cypress chips.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
---
Changes in v8:
  - No change
  
Changes in v7:
  - No change
  
Changes in v6:
  - Define SPINOR_OP_EX4B_CYPRESS and use it

 drivers/mtd/spi/spi-nor-core.c | 3 +++
 include/linux/mtd/spi-nor.h    | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 0e013e0c61..c2b26cc2fd 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -516,6 +516,9 @@ static int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 		}
 
 		return status;
+	case SNOR_MFR_CYPRESS:
+		cmd = enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B_CYPRESS;
+		return nor->write_reg(nor, cmd, NULL, 0);
 	default:
 		/* Spansion style */
 		nor->cmd_buf[0] = enable << 7;
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 8a187eaf26..0b295c3eec 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -121,6 +121,7 @@
 #define SPINOR_OP_BRWR		0x17	/* Bank register write */
 #define SPINOR_OP_BRRD		0x16	/* Bank register read */
 #define SPINOR_OP_CLSR		0x30	/* Clear status register 1 */
+#define SPINOR_OP_EX4B_CYPRESS	0xB8	/* Exit 4-byte mode */
 #define SPINOR_OP_RDAR		0x65	/* Read any register */
 #define SPINOR_OP_WRAR		0x71	/* Write any register */
 #define SPINOR_REG_ADDR_STR1V	0x00800000
-- 
2.25.1



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