drivers/mtd/spi/sf_internal.h

/*
 * SPI flash internal definitions
 *
 * Copyright (C) 2008 Atmel Corporation
 * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _SF_INTERNAL_H_
#define _SF_INTERNAL_H_

#include <linux/types.h>
#include <linux/compiler.h>

/* Dual SPI flash memories - see SPI_COMM_DUAL_... */
enum spi_dual_flash {
	SF_SINGLE_FLASH	= 0,
	SF_DUAL_STACKED_FLASH	= BIT(0),
	SF_DUAL_PARALLEL_FLASH	= BIT(1),
};

enum spi_nor_option_flags {
	SNOR_F_SST_WR		= BIT(0),
	SNOR_F_USE_FSR		= BIT(1),
	SNOR_F_USE_UPAGE	= BIT(3),
};

#define SPI_FLASH_3B_ADDR_LEN		3
#define SPI_FLASH_CMD_LEN		(1 + SPI_FLASH_3B_ADDR_LEN)
#define SPI_FLASH_16MB_BOUN		0x1000000

/* CFI Manufacture ID's */
#define SPI_FLASH_CFI_MFR_SPANSION	0x01
#define SPI_FLASH_CFI_MFR_STMICRO	0x20
#define SPI_FLASH_CFI_MFR_MACRONIX	0xc2
#define SPI_FLASH_CFI_MFR_SST		0xbf
#define SPI_FLASH_CFI_MFR_WINBOND	0xef
#define SPI_FLASH_CFI_MFR_ATMEL		0x1f

/* Erase commands */
#define CMD_ERASE_4K			0x20
#define CMD_ERASE_CHIP			0xc7
#define CMD_ERASE_64K			0xd8

/* Write commands */
#define CMD_WRITE_STATUS		0x01
#define CMD_PAGE_PROGRAM		0x02
#define CMD_WRITE_DISABLE		0x04
#define CMD_WRITE_ENABLE		0x06
#define CMD_QUAD_PAGE_PROGRAM		0x32
#define CMD_WRITE_EVCR			0x61

/* Read commands */
#define CMD_READ_ARRAY_SLOW		0x03
#define CMD_READ_ARRAY_FAST		0x0b
#define CMD_READ_DUAL_OUTPUT_FAST	0x3b
#define CMD_READ_DUAL_IO_FAST		0xbb
#define CMD_READ_QUAD_OUTPUT_FAST	0x6b
#define CMD_READ_QUAD_IO_FAST		0xeb
#define CMD_READ_ID			0x9f
#define CMD_READ_STATUS			0x05
#define CMD_READ_STATUS1		0x35
#define CMD_READ_CONFIG			0x35
#define CMD_FLAG_STATUS			0x70
#define CMD_READ_EVCR			0x65

/* Bank addr access commands */
#ifdef CONFIG_SPI_FLASH_BAR
# define CMD_BANKADDR_BRWR		0x17
# define CMD_BANKADDR_BRRD		0x16
# define CMD_EXTNADDR_WREAR		0xC5
# define CMD_EXTNADDR_RDEAR		0xC8
#endif

/* Common status */
#define STATUS_WIP			BIT(0)
#define STATUS_QEB_WINSPAN		BIT(1)
#define STATUS_QEB_MXIC			BIT(6)
#define STATUS_PEC			BIT(7)
#define STATUS_QEB_MICRON		BIT(7)
#define SR_BP0				BIT(2)  /* Block protect 0 */
#define SR_BP1				BIT(3)  /* Block protect 1 */
#define SR_BP2				BIT(4)  /* Block protect 2 */

/* Flash timeout values */
#define SPI_FLASH_PROG_TIMEOUT		(2 * CONFIG_SYS_HZ)
#define SPI_FLASH_PAGE_ERASE_TIMEOUT	(5 * CONFIG_SYS_HZ)
#define SPI_FLASH_SECTOR_ERASE_TIMEOUT	(10 * CONFIG_SYS_HZ)

/* SST specific */
#ifdef CONFIG_SPI_FLASH_SST
# define CMD_SST_BP		0x02    /* Byte Program */
# define CMD_SST_AAI_WP		0xAD	/* Auto Address Incr Word Program */

int sst_write_wp(struct spi_flash *flash, u32 offset, size_t len,
		const void *buf);
int sst_write_bp(struct spi_flash *flash, u32 offset, size_t len,
		const void *buf);
#endif

#define JEDEC_MFR(info)		((info)->id[0])
#define JEDEC_ID(info)		(((info)->id[1]) << 8 | ((info)->id[2]))
#define JEDEC_EXT(info)		(((info)->id[3]) << 8 | ((info)->id[4]))
#define SPI_FLASH_MAX_ID_LEN	6

struct spi_flash_info {
	/* Device name ([MANUFLETTER][DEVTYPE][DENSITY][EXTRAINFO]) */
	const char	*name;

	/*
	 * This array stores the ID bytes.
	 * The first three bytes are the JEDIC ID.
	 * JEDEC ID zero means "no ID" (mostly older chips).
	 */
	u8		id[SPI_FLASH_MAX_ID_LEN];
	u8		id_len;

	/*
	 * The size listed here is what works with SPINOR_OP_SE, which isn't
	 * necessarily called a "sector" by the vendor.
	 */
	u32		sector_size;
	u32		n_sectors;

	u16		page_size;

	u16		flags;
#define SECT_4K			BIT(0)	/* CMD_ERASE_4K works uniformly */
#define E_FSR			BIT(1)	/* use flag status register for */
#define SST_WR			BIT(2)	/* use SST byte/word programming */
#define WR_QPP			BIT(3)	/* use Quad Page Program */
#define RD_QUAD			BIT(4)	/* use Quad Read */
#define RD_DUAL			BIT(5)	/* use Dual Read */
#define RD_QUADIO		BIT(6)	/* use Quad IO Read */
#define RD_DUALIO		BIT(7)	/* use Dual IO Read */
#define RD_FULL			(RD_QUAD | RD_DUAL | RD_QUADIO | RD_DUALIO)
};

extern const struct spi_flash_info spi_flash_ids[];

/* Send a single-byte command to the device and read the response */
int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len);

/*
 * Send a multi-byte command to the device and read the response. Used
 * for flash array reads, etc.
 */
int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
		size_t cmd_len, void *data, size_t data_len);

/*
 * Send a multi-byte command to the device followed by (optional)
 * data. Used for programming the flash array, etc.
 */
int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
		const void *data, size_t data_len);


/* Flash erase(sectors) operation, support all possible erase commands */
int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len);

/* Lock stmicro spi flash region */
int stm_lock(struct spi_flash *flash, u32 ofs, size_t len);

/* Unlock stmicro spi flash region */
int stm_unlock(struct spi_flash *flash, u32 ofs, size_t len);

/* Check if a stmicro spi flash region is completely locked */
int stm_is_locked(struct spi_flash *flash, u32 ofs, size_t len);

/* Enable writing on the SPI flash */
static inline int spi_flash_cmd_write_enable(struct spi_flash *flash)
{
	return spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
}

/* Disable writing on the SPI flash */
static inline int spi_flash_cmd_write_disable(struct spi_flash *flash)
{
	return spi_flash_cmd(flash->spi, CMD_WRITE_DISABLE, NULL, 0);
}

/*
 * Used for spi_flash write operation
 * - SPI claim
 * - spi_flash_cmd_write_enable
 * - spi_flash_cmd_write
 * - spi_flash_wait_till_ready
 * - SPI release
 */
int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd,
		size_t cmd_len, const void *buf, size_t buf_len);

/*
 * Flash write operation, support all possible write commands.
 * Write the requested data out breaking it up into multiple write
 * commands as needed per the write size.
 */
int spi_flash_cmd_write_ops(struct spi_flash *flash, u32 offset,
		size_t len, const void *buf);

/*
 * Same as spi_flash_cmd_read() except it also claims/releases the SPI
 * bus. Used as common part of the ->read() operation.
 */
int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
		size_t cmd_len, void *data, size_t data_len);

/* Flash read operation, support all possible read commands */
int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
		size_t len, void *data);

#ifdef CONFIG_SPI_FLASH_MTD
int spi_flash_mtd_register(struct spi_flash *flash);
void spi_flash_mtd_unregister(void);
#endif

/**
 * spi_flash_scan - scan the SPI FLASH
 * @flash:	the spi flash structure
 *
 * The drivers can use this fuction to scan the SPI FLASH.
 * In the scanning, it will try to get all the necessary information to
 * fill the spi_flash{}.
 *
 * Return: 0 for success, others for failure.
 */
int spi_flash_scan(struct spi_flash *flash);

#endif /* _SF_INTERNAL_H_ */