Follow patch "f6adec1af4b2f5d3012480c6cdce7743b74a6156" for adding Macronix flash in Octal DTR mode.
Enable Octal DTR mode with 20 dummy cycles to allow running at the maximum supported frequency. -https://www.mxic.com.tw/Lists/Datasheet/Attachments/7841/MX25LM51245G,%203V,...
Signed-off-by: JaimeLiao jaimeliao.tw@gmail.com --- drivers/mtd/spi/spi-nor-core.c | 83 ++++++++++++++++++++++++++++++++++ include/linux/mtd/spi-nor.h | 12 ++++- 2 files changed, 93 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index d5d905fa5a..0a6550984b 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -3489,6 +3489,85 @@ static struct spi_nor_fixups mt35xu512aba_fixups = { }; #endif /* CONFIG_SPI_FLASH_MT35XU */
+#if CONFIG_IS_ENABLED(SPI_FLASH_MACRONIX) +/** + * spi_nor_macronix_octal_dtr_enable() - set DTR OPI Enable bit in Configuration Register 2. + * @nor: pointer to a 'struct spi_nor' + * + * Set the DTR OPI Enable (DOPI) bit in Configuration Register 2. + * Bit 2 of Configuration Register 2 is the DOPI bit for Macronix like OPI memories. + * + * Return: 0 on success, -errno otherwise. + */ +static int spi_nor_macronix_octal_dtr_enable(struct spi_nor *nor) +{ + struct spi_mem_op op; + int ret; + u8 buf; + + ret = write_enable(nor); + if (ret) + return ret; + + buf = SPINOR_REG_MXIC_DC_20; + op = (struct spi_mem_op) + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_CR2, 1), + SPI_MEM_OP_ADDR(4, SPINOR_REG_MXIC_CR2_DC, 1), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_OUT(1, &buf, 1)); + + ret = spi_mem_exec_op(nor->spi, &op); + if (ret) + return ret; + + ret = spi_nor_wait_till_ready(nor); + if (ret) + return ret; + + nor->read_dummy = MXIC_MAX_DC; + ret = write_enable(nor); + if (ret) + return ret; + + buf = SPINOR_REG_MXIC_OPI_DTR_EN; + op = (struct spi_mem_op) + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_CR2, 1), + SPI_MEM_OP_ADDR(4, SPINOR_REG_MXIC_CR2_MODE, 1), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_OUT(1, &buf, 1)); + + ret = spi_mem_exec_op(nor->spi, &op); + if (ret) { + dev_err(nor->dev, "Failed to enable octal DTR mode\n"); + return ret; + } + nor->reg_proto = SNOR_PROTO_8_8_8_DTR; + + return 0; +} + +static void macronix_octal_default_init(struct spi_nor *nor) +{ + nor->octal_dtr_enable = spi_nor_macronix_octal_dtr_enable; +} + +static void macronix_octal_post_sfdp_fixup(struct spi_nor *nor, + struct spi_nor_flash_parameter *params) +{ + /* + * Adding SNOR_HWCAPS_PP_8_8_8_DTR in hwcaps.mask when + * SPI_NOR_OCTAL_DTR_READ flag exists. + */ + if (params->hwcaps.mask & SNOR_HWCAPS_READ_8_8_8_DTR) + params->hwcaps.mask |= SNOR_HWCAPS_PP_8_8_8_DTR; +} + +static struct spi_nor_fixups macronix_octal_fixups = { + .default_init = macronix_octal_default_init, + .post_sfdp = macronix_octal_post_sfdp_fixup, +}; +#endif /* CONFIG_SPI_FLASH_MACRONIX */ + /** spi_nor_octal_dtr_enable() - enable Octal DTR I/O if needed * @nor: pointer to a 'struct spi_nor' * @@ -3655,6 +3734,10 @@ void spi_nor_set_fixups(struct spi_nor *nor) if (!strcmp(nor->info->name, "mt35xu512aba")) nor->fixups = &mt35xu512aba_fixups; #endif + +#if CONFIG_IS_ENABLED(SPI_FLASH_MACRONIX) + nor->fixups = ¯onix_octal_fixups; +#endif /* SPI_FLASH_MACRONIX */ }
int spi_nor_scan(struct spi_nor *nor) diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index 7ddc4ba2bf..8682368f2f 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -116,8 +116,16 @@ #define XSR_RDY BIT(7) /* Ready */
/* Used for Macronix and Winbond flashes. */ -#define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */ -#define SPINOR_OP_EX4B 0xe9 /* Exit 4-byte mode */ +#define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */ +#define SPINOR_OP_EX4B 0xe9 /* Exit 4-byte mode */ +#define SPINOR_OP_RD_CR2 0x71 /* Read configuration register 2 */ +#define SPINOR_OP_WR_CR2 0x72 /* Write configuration register 2 */ +#define SPINOR_OP_MXIC_DTR_RD 0xee /* Fast Read opcode in DTR mode */ +#define SPINOR_REG_MXIC_CR2_MODE 0x00000000 /* For setting octal DTR mode */ +#define SPINOR_REG_MXIC_OPI_DTR_EN 0x2 /* Enable Octal DTR */ +#define SPINOR_REG_MXIC_CR2_DC 0x00000300 /* For setting dummy cycles */ +#define SPINOR_REG_MXIC_DC_20 0x0 /* Setting dummy cycles to 20 */ +#define MXIC_MAX_DC 20 /* Maximum value of dummy cycles */
/* Used for Spansion flashes only. */ #define SPINOR_OP_BRWR 0x17 /* Bank register write */