From: Tudor Ambarus <[email protected]> Add Global Block Unlock support as an optimization for unlocking the entire memory array. A Global Block-Protection Unlock command offers a single command cycle that unlocks the entire memory array.
Status Register Block Protection support does not imply the support for the Global Block Unlock Command. Microchip's SST26VF064B does support the 98h command, but use dedicated registers for the individual block protection, and not the Status Register, as in the stm_lock/unlock case. Call spi_nor_unlock_global_block_protection() in spi_nor_unlock() as an optimization for unlocking the entire memory array. Note that the Global Block Unlock command has different names depending on the manufacturer, but always the same command value: 98h. Macronix's MX25U12835F names it Gang Block Unlock, Winbound's W25Q128FV names it Global Block Unlock and Microchip's SST26VF064B names it Global Block Protection Unlock. We can't determine this support purely by manufacturer type and it's not autodetectable by anything like SFDP, so make a new flag for it: UNLOCK_GLOBAL_BLOCK. This flag can be set just at per-chip level, we don't need a SNOR_F_ correspondent. Signed-off-by: Tudor Ambarus <[email protected]> --- drivers/mtd/spi-nor/spi-nor.c | 47 +++++++++++++++++++++++++++++++++++++++++-- include/linux/mtd/spi-nor.h | 1 + 2 files changed, 46 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 700b1700a7a1..19556a9dd3fa 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -196,7 +196,7 @@ struct flash_info { u16 page_size; u16 addr_width; - u16 flags; + u32 flags; #define SECT_4K BIT(0) /* SPINOR_OP_BE_4K works uniformly */ #define SPI_NOR_NO_ERASE BIT(1) /* No erase command needed */ #define SST_WRITE BIT(2) /* use SST byte programming */ @@ -233,6 +233,7 @@ struct flash_info { #define SPI_NOR_SKIP_SFDP BIT(13) /* Skip parsing of SFDP tables */ #define USE_CLSR BIT(14) /* use CLSR command */ #define SPI_NOR_OCTAL_READ BIT(15) /* Flash supports Octal Read */ +#define UNLOCK_GLOBAL_BLOCK BIT(16) /* Unlock global block protection */ /* Part specific fixup hooks. */ const struct spi_nor_fixups *fixups; @@ -837,6 +838,44 @@ static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2) } /** + * spi_nor_unlock_global_block_protection() - Unlock the Global Block Protection + * @nor: pointer to a 'struct spi_nor' + * + * The Global Block-Protection Unlock command offers a single command cycle + * that unlocks the entire memory array. + * + * Return: 0 on success, -errno otherwise. + */ +static int spi_nor_unlock_global_block_protection(struct spi_nor *nor) +{ + int ret; + + ret = spi_nor_write_enable(nor); + if (ret) + return ret; + + if (nor->spimem) { + struct spi_mem_op op = + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_ULBPR, 1), + SPI_MEM_OP_NO_ADDR, + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_NO_DATA); + + ret = spi_mem_exec_op(nor->spimem, &op); + } else { + ret = nor->controller_ops->write_reg(nor, SPINOR_OP_ULBPR, + NULL, 0); + } + + if (ret < 0) { + dev_err(nor->dev, "error %d on ULBPR\n", ret); + return ret; + } + + return spi_nor_wait_till_ready(nor); +} + +/** * spi_nor_write_sr1_and_check() - Write one byte to the Status Register and * ensure the bits in the mask match the written value. * @nor: pointer to a 'struct spi_nor'. @@ -1916,7 +1955,11 @@ static int spi_nor_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) if (ret) return ret; - ret = nor->flash.locking_ops->unlock(nor, ofs, len); + if (nor->info->flags & UNLOCK_GLOBAL_BLOCK && + !ofs && len == nor->flash.size) + ret = spi_nor_unlock_global_block_protection(nor); + else + ret = nor->flash.locking_ops->unlock(nor, ofs, len); spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_LOCK); return ret; diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index ca650f895903..6812416ab013 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -66,6 +66,7 @@ #define SPINOR_OP_CLFSR 0x50 /* Clear flag status register */ #define SPINOR_OP_RDEAR 0xc8 /* Read Extended Address Register */ #define SPINOR_OP_WREAR 0xc5 /* Write Extended Address Register */ +#define SPINOR_OP_ULBPR 0x98 /* Global Block Unlock Protection */ /* 4-byte address opcodes - used on Spansion and some Macronix flashes. */ #define SPINOR_OP_READ_4B 0x13 /* Read data bytes (low frequency) */ -- 2.9.5
