diff options
| author | Dhruva Gole <d-gole@ti.com> | 2022-11-17 17:40:57 +0530 |
|---|---|---|
| committer | Anand Gadiyar <gadiyar@ti.com> | 2022-11-21 09:33:36 -0600 |
| commit | 35c5ec0da0c43660da065ef87b8486c185920675 (patch) | |
| tree | 17d9ce96a8345e7460202584f74708133c623be7 | |
| parent | 8a04f38d4d2876739bade28a886b355bfc4f2167 (diff) | |
mtd: spi-nor-core: Add support for Read/Write Any Register
Commit 2d20f344858265722452d06fe7a5f86ca736b86d upstream.
Some of Spansion/Cypress chips support Read/Write Any Register commands.
These commands are mainly used to write volatile registers and access to
the registers in second and subsequent die for multi-die package parts.
The Read Any Register instruction (65h) is followed by register address
and dummy cycles, then the selected register byte is returned.
The Write Any Register instruction (71h) is followed by register address
and register byte to write.
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
| -rw-r--r-- | drivers/mtd/spi/spi-nor-core.c | 25 | ||||
| -rw-r--r-- | include/linux/mtd/spi-nor.h | 2 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index 2c1db88926..70db2af66a 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -333,6 +333,31 @@ static struct spi_mem_op spi_nor_read_op(struct spi_nor *nor) return op; } +#ifdef CONFIG_SPI_FLASH_SPANSION +static int spansion_read_any_reg(struct spi_nor *nor, u32 addr, u8 dummy, + u8 *val) +{ + struct spi_mem_op op = + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDAR, 1), + SPI_MEM_OP_ADDR(nor->addr_width, addr, 1), + SPI_MEM_OP_DUMMY(dummy / 8, 1), + SPI_MEM_OP_DATA_IN(1, NULL, 1)); + + return spi_nor_read_write_reg(nor, &op, val); +} + +static int spansion_write_any_reg(struct spi_nor *nor, u32 addr, u8 val) +{ + struct spi_mem_op op = + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRAR, 1), + SPI_MEM_OP_ADDR(nor->addr_width, addr, 1), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_OUT(1, NULL, 1)); + + return spi_nor_read_write_reg(nor, &op, &val); +} +#endif + static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len, u_char *buf) { diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index 8b5943ad73..72e48351cc 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -123,6 +123,8 @@ #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_RDAR 0x65 /* Read any register */ +#define SPINOR_OP_WRAR 0x71 /* Write any register */ /* Used for Micron flashes only. */ #define SPINOR_OP_RD_EVCR 0x65 /* Read EVCR register */ |