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mtd: spi-nor: Rework the SPI NOR lock/unlock logic

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Add the SNOR_F_HAS_LOCK flag and set it when SPI_NOR_HAS_LOCK is set
in the flash_info entry or when it's a Micron or ST flash.

Move the locking hooks in a separate struct so that we have just
one field to update when we change the locking implementation.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
[tudor.ambarus@microchip.com: use ->default_init() hook, introduce
spi_nor_late_init_params(), set ops in nor->params]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Boris Brezillon 2019-08-24 09:22:03 +03:00 • committed by Tudor Ambarus
parent 64c160f322
commit dff972458a
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GPG key ID: 4B554F47A58D14E9
2 changed files with 53 additions and 20 deletions
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23
include/linux/mtd/spi-nor.h
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@ -243,6 +243,7 @@ enum spi_nor_option_flags {
SNOR_F_BROKEN_RESET = BIT(6),
SNOR_F_4B_OPCODES = BIT(7),
SNOR_F_HAS_4BAIT = BIT(8),
SNOR_F_HAS_LOCK = BIT(9),
};
/**
@ -465,6 +466,18 @@ enum spi_nor_pp_command_index {
/* Forward declaration that will be used in 'struct spi_nor_flash_parameter' */
struct spi_nor;
/**
* struct spi_nor_locking_ops - SPI NOR locking methods
* @lock: lock a region of the SPI NOR.
* @unlock: unlock a region of the SPI NOR.
* @is_locked: check if a region of the SPI NOR is completely locked
*/
struct spi_nor_locking_ops {
int (*lock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*unlock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
};
/**
* struct spi_nor_flash_parameter - SPI NOR flash parameters and settings.
* Includes legacy flash parameters and settings that can be overwritten
@ -483,6 +496,7 @@ struct spi_nor;
* Table.
* @quad_enable: enables SPI NOR quad mode.
* @set_4byte: puts the SPI NOR in 4 byte addressing mode.
* @locking_ops: SPI NOR locking methods.
*/
struct spi_nor_flash_parameter {
u64 size;
@ -496,6 +510,8 @@ struct spi_nor_flash_parameter {
int (*quad_enable)(struct spi_nor *nor);
int (*set_4byte)(struct spi_nor *nor, bool enable);
const struct spi_nor_locking_ops *locking_ops;
};
/**
@ -536,10 +552,6 @@ struct flash_info;
* @erase: [DRIVER-SPECIFIC] erase a sector of the SPI NOR
* at the offset @offs; if not provided by the driver,
* spi-nor will send the erase opcode via write_reg()
* @flash_lock: [FLASH-SPECIFIC] lock a region of the SPI NOR
* @flash_unlock: [FLASH-SPECIFIC] unlock a region of the SPI NOR
* @flash_is_locked: [FLASH-SPECIFIC] check if a region of the SPI NOR is
* completely locked
* @clear_sr_bp: [FLASH-SPECIFIC] clears the Block Protection Bits from
* the SPI NOR Status Register.
* @params: [FLASH-SPECIFIC] SPI-NOR flash parameters and settings.
@ -579,9 +591,6 @@ struct spi_nor {
size_t len, const u_char *write_buf);
int (*erase)(struct spi_nor *nor, loff_t offs);
int (*flash_lock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*flash_unlock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*flash_is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*clear_sr_bp)(struct spi_nor *nor);
struct spi_nor_flash_parameter params;