Commit 6e602ef7 authored by Huang Shijie's avatar Huang Shijie Committed by Brian Norris
Browse files

mtd: spi-nor: add the basic data structures 



The spi_nor{} is cloned from the m25p{}.
The spi_nor{} can be used by both the m25p80 and spi-nor controller.

We also add the spi_nor_xfer_cfg{} which can be used by the two
fundamental primitives: read_xfer/write_xfer.

 1) the hooks for spi_nor{}:
    @prepare/unpreare: used to do some work before or after the
             read/write/erase/lock/unlock.
    @read_xfer/write_xfer: We can use these two hooks to code all
             the following hooks if the driver tries to implement them
             by itself.
    @read_reg: used to read the registers, such as read status register,
             read configure register.
    @write_reg: used to write the registers, such as write enable,
             erase sector.
    @read_id: read out the ID info.
    @wait_till_ready: wait till the NOR becomes ready.
    @read: read out the data from the NOR.
    @write: write data to the NOR.
    @erase: erase a sector of the NOR.

 2) Add a new field sst_write_second for the SST NOR write.

Signed-off-by: default avatarHuang Shijie <b32955@freescale.com>
Acked-by: default avatarMarek Vasut <marex@denx.de>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent f39d2fa0

include/linux/mtd/spi-nor.h

+110 −0
Original line number Diff line number Diff line
@@ -52,4 +52,114 @@ 
/* Configuration Register bits. */

#define CR_QUAD_EN_SPAN		0x2     /* Spansion Quad I/O */



enum read_mode {

	SPI_NOR_NORMAL = 0,

	SPI_NOR_FAST,

	SPI_NOR_DUAL,

	SPI_NOR_QUAD,

};



/**

 * struct spi_nor_xfer_cfg - Structure for defining a Serial Flash transfer

 * @wren:		command for "Write Enable", or 0x00 for not required

 * @cmd:		command for operation

 * @cmd_pins:		number of pins to send @cmd (1, 2, 4)

 * @addr:		address for operation

 * @addr_pins:		number of pins to send @addr (1, 2, 4)

 * @addr_width:		number of address bytes

 *			(3,4, or 0 for address not required)

 * @mode:		mode data

 * @mode_pins:		number of pins to send @mode (1, 2, 4)

 * @mode_cycles:	number of mode cycles (0 for mode not required)

 * @dummy_cycles:	number of dummy cycles (0 for dummy not required)

 */

struct spi_nor_xfer_cfg {

	u8		wren;

	u8		cmd;

	u8		cmd_pins;

	u32		addr;

	u8		addr_pins;

	u8		addr_width;

	u8		mode;

	u8		mode_pins;

	u8		mode_cycles;

	u8		dummy_cycles;

};



#define	SPI_NOR_MAX_CMD_SIZE	8

enum spi_nor_ops {

	SPI_NOR_OPS_READ = 0,

	SPI_NOR_OPS_WRITE,

	SPI_NOR_OPS_ERASE,

	SPI_NOR_OPS_LOCK,

	SPI_NOR_OPS_UNLOCK,

};



/**

 * struct spi_nor - Structure for defining a the SPI NOR layer

 * @mtd:		point to a mtd_info structure

 * @lock:		the lock for the read/write/erase/lock/unlock operations

 * @dev:		point to a spi device, or a spi nor controller device.

 * @page_size:		the page size of the SPI NOR

 * @addr_width:		number of address bytes

 * @erase_opcode:	the opcode for erasing a sector

 * @read_opcode:	the read opcode

 * @read_dummy:		the dummy needed by the read operation

 * @program_opcode:	the program opcode

 * @flash_read:		the mode of the read

 * @sst_write_second:	used by the SST write operation

 * @cfg:		used by the read_xfer/write_xfer

 * @cmd_buf:		used by the write_reg

 * @prepare:		[OPTIONAL] do some preparations for the

 *			read/write/erase/lock/unlock operations

 * @unprepare:		[OPTIONAL] do some post work after the

 *			read/write/erase/lock/unlock operations

 * @read_xfer:		[OPTIONAL] the read fundamental primitive

 * @write_xfer:		[OPTIONAL] the writefundamental primitive

 * @read_reg:		[DRIVER-SPECIFIC] read out the register

 * @write_reg:		[DRIVER-SPECIFIC] write data to the register

 * @read_id:		[REPLACEABLE] read out the ID data, and find

 *			the proper spi_device_id

 * @wait_till_ready:	[REPLACEABLE] wait till the NOR becomes ready

 * @read:		[DRIVER-SPECIFIC] read data from the SPI NOR

 * @write:		[DRIVER-SPECIFIC] write data to the SPI NOR

 * @erase:		[DRIVER-SPECIFIC] erase a sector of the SPI NOR

 *			at the offset @offs

 * @priv:		the private data

 */

struct spi_nor {

	struct mtd_info		*mtd;

	struct mutex		lock;

	struct device		*dev;

	u32			page_size;

	u8			addr_width;

	u8			erase_opcode;

	u8			read_opcode;

	u8			read_dummy;

	u8			program_opcode;

	enum read_mode		flash_read;

	bool			sst_write_second;

	struct spi_nor_xfer_cfg	cfg;

	u8			cmd_buf[SPI_NOR_MAX_CMD_SIZE];



	int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);

	void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);

	int (*read_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,

			 u8 *buf, size_t len);

	int (*write_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,

			  u8 *buf, size_t len);

	int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);

	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len,

			int write_enable);

	const struct spi_device_id *(*read_id)(struct spi_nor *nor);

	int (*wait_till_ready)(struct spi_nor *nor);



	int (*read)(struct spi_nor *nor, loff_t from,

			size_t len, size_t *retlen, u_char *read_buf);

	void (*write)(struct spi_nor *nor, loff_t to,

			size_t len, size_t *retlen, const u_char *write_buf);

	int (*erase)(struct spi_nor *nor, loff_t offs);



	void *priv;

};

#endif

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