From 75386810d3a61f4bb9e180774291454f7235b8b3 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Thu, 21 Jan 2021 13:05:46 +0200 Subject: [PATCH] mtd: spi-nor: sst: Add support for Global Unlock on sst26vf Even if sst26vf shares the SPINOR_OP_GBULK opcode with Macronix (ex. MX25U12835F) and Winbound (ex. W25Q128FV), it has its own Individual Block Protection scheme, which is also capable to read-lock individual parameter blocks. Thus the sst26vf's Individual Block Protection scheme will reside in the sst.c manufacturer driver. Add support to unlock the entire flash memory. The device is write-protected by default after a power-on reset cycle (volatile software protection), in order to avoid inadvertent writes during power-up. Could do an erase, write, read back, and compare when MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE=y. Signed-off-by: Tudor Ambarus Reviewed-by: Michael Walle Link: https://lore.kernel.org/r/20210121110546.382633-2-tudor.ambarus@microchip.com --- drivers/mtd/spi-nor/core.c | 2 +- drivers/mtd/spi-nor/core.h | 1 + drivers/mtd/spi-nor/sst.c | 52 ++++++++++++++++++++++++++++++++++++-- 3 files changed, 52 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 47ded0977056..0522304f52fa 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -465,7 +465,7 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr) * * Return: 0 on success, -errno otherwise. */ -static int spi_nor_read_cr(struct spi_nor *nor, u8 *cr) +int spi_nor_read_cr(struct spi_nor *nor, u8 *cr) { int ret; diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index eb26796db026..4a3f7f150b5d 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -441,6 +441,7 @@ int spi_nor_sr1_bit6_quad_enable(struct spi_nor *nor); int spi_nor_sr2_bit1_quad_enable(struct spi_nor *nor); int spi_nor_sr2_bit7_quad_enable(struct spi_nor *nor); int spi_nor_read_sr(struct spi_nor *nor, u8 *sr); +int spi_nor_read_cr(struct spi_nor *nor, u8 *cr); int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len); int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 sr1); diff --git a/drivers/mtd/spi-nor/sst.c b/drivers/mtd/spi-nor/sst.c index 00e48da0744a..980f4c09c91d 100644 --- a/drivers/mtd/spi-nor/sst.c +++ b/drivers/mtd/spi-nor/sst.c @@ -8,6 +8,53 @@ #include "core.h" +#define SST26VF_CR_BPNV BIT(3) + +static int sst26vf_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) +{ + return -EOPNOTSUPP; +} + +static int sst26vf_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len) +{ + int ret; + + /* We only support unlocking the entire flash array. */ + if (ofs != 0 || len != nor->params->size) + return -EINVAL; + + ret = spi_nor_read_cr(nor, nor->bouncebuf); + if (ret) + return ret; + + if (!(nor->bouncebuf[0] & SST26VF_CR_BPNV)) { + dev_dbg(nor->dev, "Any block has been permanently locked\n"); + return -EINVAL; + } + + return spi_nor_global_block_unlock(nor); +} + +static int sst26vf_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len) +{ + return -EOPNOTSUPP; +} + +static const struct spi_nor_locking_ops sst26vf_locking_ops = { + .lock = sst26vf_lock, + .unlock = sst26vf_unlock, + .is_locked = sst26vf_is_locked, +}; + +static void sst26vf_default_init(struct spi_nor *nor) +{ + nor->params->locking_ops = &sst26vf_locking_ops; +} + +static const struct spi_nor_fixups sst26vf_fixups = { + .default_init = sst26vf_default_init, +}; + static const struct flash_info sst_parts[] = { /* SST -- large erase sizes are "overlays", "sectors" are 4K */ { "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024, 8, @@ -39,8 +86,9 @@ static const struct flash_info sst_parts[] = { { "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32, SECT_4K | SPI_NOR_DUAL_READ) }, { "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, - SECT_4K | SPI_NOR_DUAL_READ | - SPI_NOR_QUAD_READ) }, + SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | + SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE) + .fixups = &sst26vf_fixups }, }; static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,