Messages in this thread Patch in this message |  | | From | <> | Subject | Re: [PATCH v6 4/5] mtd: spi-nor: atmel: Fix unlock_all() for AT25FS010/040 | Date | Sat, 28 Nov 2020 08:25:09 +0000 |
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On 11/26/20 10:26 PM, Michael Walle wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > These flashes have some weird BP bits mapping which aren't supported in > the current locking code. Just add a simple unlock op to unprotect the > entire flash array which is needed for legacy behavior. > > Signed-off-by: Michael Walle <michael@walle.cc> > --- > changes since v5 > - new patch > > drivers/mtd/spi-nor/atmel.c | 53 +++++++++++++++++++++++++++++++++++-- > drivers/mtd/spi-nor/core.c | 2 +- > drivers/mtd/spi-nor/core.h | 1 + > 3 files changed, 53 insertions(+), 3 deletions(-) > > diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c > index 49d392c6c8bc..fe6a4653823d 100644 > --- a/drivers/mtd/spi-nor/atmel.c > +++ b/drivers/mtd/spi-nor/atmel.c > @@ -8,10 +8,59 @@ > > #include "core.h" > > +/* > + * The Atmel AT25FS010/AT25FS040 parts have some weird configuration for the > + * block protection bits. We don't support them. But legacy behaviour in linux > + * is to unlock the whole flash array on startup. Therefore, we have to support > + * exactly this operation. > + */ > +static int atmel_at25fs_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) > +{ > + return -EOPNOTSUPP; > +} > + > +static int atmel_at25fs_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len) > +{ > + /* We only support unlocking the whole flash array */ > + if (ofs || len != nor->params->size) > + return -EINVAL; > + > + /* > + * Write 0x00 to the status register to try to disable the write > + * protection. This will fail if SRWD (the datasheet calls it WPEN) is > + * set. But there is nothing we can do. > + */
can't we do the same as you did in 5/5? + ret = spi_nor_read_sr(nor, nor->bouncebuf); + if (ret) + return ret; + + sr = nor->bouncebuf[0]; + + if (sr & SR_SRWD) { + sr &= ~SR_SRWD; + ret = spi_nor_write_sr_and_check(nor, sr); + if (ret) + return ret; + }
If SRWD is set to 1, we first try to set it to 0. If WP# is asserted, we will catch this in spi_nor_write_sr_and_check()
> + nor->bouncebuf[0] = 0; > + > + return spi_nor_write_sr(nor, nor->bouncebuf, 1);
and then you can use spi_nor_write_sr_and_check here
> +} > + > +static int atmel_at25fs_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len) > +{ > + return -EOPNOTSUPP; > +} > + > +static const struct spi_nor_locking_ops atmel_at25fs_locking_ops = { > + .lock = atmel_at25fs_lock, > + .unlock = atmel_at25fs_unlock, > + .is_locked = atmel_at25fs_is_locked, > +}; > + > +static void atmel_at25fs_default_init(struct spi_nor *nor) > +{ > + nor->params->locking_ops = &atmel_at25fs_locking_ops; > +} > + > +static const struct spi_nor_fixups atmel_at25fs_fixups = { > + .default_init = atmel_at25fs_default_init, > +}; > + > static const struct flash_info atmel_parts[] = { > /* Atmel -- some are (confusingly) marketed as "DataFlash" */ > - { "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4, SECT_4K | SPI_NOR_HAS_LOCK) }, > - { "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK) }, > + { "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4, SECT_4K | SPI_NOR_HAS_LOCK) > + .fixups = &atmel_at25fs_fixups }, > + { "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK) > + .fixups = &atmel_at25fs_fixups }, > > { "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8, SECT_4K | SPI_NOR_HAS_LOCK) }, > { "at25df321", INFO(0x1f4700, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_HAS_LOCK) }, > diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c > index 5bee7c8da4dc..8c06a28a90de 100644 > --- a/drivers/mtd/spi-nor/core.c > +++ b/drivers/mtd/spi-nor/core.c > @@ -861,7 +861,7 @@ int spi_nor_wait_till_ready(struct spi_nor *nor) > * > * Return: 0 on success, -errno otherwise. > */ > -static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len) > +int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len) > { > int ret; > > diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h > index 0a775a7b5606..16b350e1d865 100644 > --- a/drivers/mtd/spi-nor/core.h > +++ b/drivers/mtd/spi-nor/core.h > @@ -430,6 +430,7 @@ void spi_nor_unlock_and_unprep(struct spi_nor *nor); > 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_write_sr(struct spi_nor *nor, const u8 *sr, size_t len); > > int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr); > ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len, > -- > 2.20.1 >
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