diff options
Diffstat (limited to 'drivers/mtd/spi-nor/winbond.c')
| -rw-r--r-- | drivers/mtd/spi-nor/winbond.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c index fe80dffc2e70..5a60468d897d 100644 --- a/drivers/mtd/spi-nor/winbond.c +++ b/drivers/mtd/spi-nor/winbond.c @@ -8,6 +8,15 @@ #include "core.h" +#define WINBOND_NOR_OP_RDEAR 0xc8 /* Read Extended Address Register */ +#define WINBOND_NOR_OP_WREAR 0xc5 /* Write Extended Address Register */ + +#define WINBOND_NOR_WREAR_OP(buf) \ + SPI_MEM_OP(SPI_MEM_OP_CMD(WINBOND_NOR_OP_WREAR, 0), \ + SPI_MEM_OP_NO_ADDR, \ + SPI_MEM_OP_NO_DUMMY, \ + SPI_MEM_OP_DATA_OUT(1, buf, 0)) + static int w25q256_post_bfpt_fixups(struct spi_nor *nor, const struct sfdp_parameter_header *bfpt_header, @@ -130,6 +139,37 @@ static const struct flash_info winbond_nor_parts[] = { }; /** + * winbond_nor_write_ear() - Write Extended Address Register. + * @nor: pointer to 'struct spi_nor'. + * @ear: value to write to the Extended Address Register. + * + * Return: 0 on success, -errno otherwise. + */ +static int winbond_nor_write_ear(struct spi_nor *nor, u8 ear) +{ + int ret; + + nor->bouncebuf[0] = ear; + + if (nor->spimem) { + struct spi_mem_op op = WINBOND_NOR_WREAR_OP(nor->bouncebuf); + + spi_nor_spimem_setup_op(nor, &op, nor->reg_proto); + + ret = spi_mem_exec_op(nor->spimem, &op); + } else { + ret = spi_nor_controller_ops_write_reg(nor, + WINBOND_NOR_OP_WREAR, + nor->bouncebuf, 1); + } + + if (ret) + dev_dbg(nor->dev, "error %d writing EAR\n", ret); + + return ret; +} + +/** * winbond_nor_set_4byte_addr_mode() - Set 4-byte address mode for Winbond * flashes. * @nor: pointer to 'struct spi_nor'. @@ -155,7 +195,7 @@ static int winbond_nor_set_4byte_addr_mode(struct spi_nor *nor, bool enable) if (ret) return ret; - ret = spi_nor_write_ear(nor, 0); + ret = winbond_nor_write_ear(nor, 0); if (ret) return ret; |