// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2014 Freescale Semiconductor, Inc.
 * Synced from Linux v4.19
 */

#ifndef __LINUX_MTD_SPI_NOR_H
#define __LINUX_MTD_SPI_NOR_H

#include <mtd.h>
#include <linux/bitops.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/mtd.h>

/*
 * Manufacturer IDs
 *
 * The first byte returned from the flash after sending opcode SPINOR_OP_RDID.
 * Sometimes these are the same as CFI IDs, but sometimes they aren't.
 */
#define SNOR_MFR_ATMEL          CFI_MFR_ATMEL
#define SNOR_MFR_GIGADEVICE     0xc8
#define SNOR_MFR_INTEL          CFI_MFR_INTEL
#define SNOR_MFR_ST             CFI_MFR_ST /* ST Micro <--> Micron */
#define SNOR_MFR_MICRON         CFI_MFR_MICRON /* ST Micro <--> Micron */
#define SNOR_MFR_ISSI           CFI_MFR_PMC
#define SNOR_MFR_MACRONIX       CFI_MFR_MACRONIX
#define SNOR_MFR_SPANSION       CFI_MFR_AMD
#define SNOR_MFR_SST            CFI_MFR_SST
#define SNOR_MFR_WINBOND        0xef /* Also used by some Spansion */
#define SNOR_MFR_CYPRESS        0x34

/*
 * Note on opcode nomenclature: some opcodes have a format like
 * SPINOR_OP_FUNCTION{4,}_x_y_z. The numbers x, y, and z stand for the number
 * of I/O lines used for the opcode, address, and data (respectively). The
 * FUNCTION has an optional suffix of '4', to represent an opcode which
 * requires a 4-byte (32-bit) address.
 */

/* Flash opcodes. */
#define SPINOR_OP_WREN          0x06    /* Write enable */
#define SPINOR_OP_RDSR          0x05    /* Read status register */
#define SPINOR_OP_WRSR          0x01    /* Write status register 1 byte */
#define SPINOR_OP_RDSR2         0x3f    /* Read status register 2 */
#define SPINOR_OP_WRSR2         0x3e    /* Write status register 2 */
#define SPINOR_OP_READ          0x03    /* Read data bytes (low frequency) */
#define SPINOR_OP_READ_FAST     0x0b    /* Read data bytes (high frequency) */
#define SPINOR_OP_READ_1_1_2    0x3b    /* Read data bytes (Dual Output SPI) */
#define SPINOR_OP_READ_1_2_2    0xbb    /* Read data bytes (Dual I/O SPI) */
#define SPINOR_OP_READ_1_1_4    0x6b    /* Read data bytes (Quad Output SPI) */
#define SPINOR_OP_READ_1_4_4    0xeb    /* Read data bytes (Quad I/O SPI) */
#define SPINOR_OP_READ_1_1_8    0x8b    /* Read data bytes (Octal Output SPI) */
#define SPINOR_OP_READ_1_8_8    0xcb    /* Read data bytes (Octal I/O SPI) */
#define SPINOR_OP_PP            0x02    /* Page program (up to 256 bytes) */
#define SPINOR_OP_PP_1_1_4      0x32    /* Quad page program */
#define SPINOR_OP_PP_1_4_4      0x38    /* Quad page program */
#define SPINOR_OP_PP_1_1_8      0x82    /* Octal page program */
#define SPINOR_OP_PP_1_8_8      0xc2    /* Octal page program */
#define SPINOR_OP_BE_4K         0x20    /* Erase 4KiB block */
#define SPINOR_OP_BE_4K_PMC     0xd7    /* Erase 4KiB block on PMC chips */
#define SPINOR_OP_BE_32K        0x52    /* Erase 32KiB block */
#define SPINOR_OP_CHIP_ERASE    0xc7    /* Erase whole flash chip */
#define SPINOR_OP_SE            0xd8    /* Sector erase (usually 64KiB) */
#define SPINOR_OP_RDID          0x9f    /* Read JEDEC ID */
#define SPINOR_OP_RDSFDP        0x5a    /* Read SFDP */
#define SPINOR_OP_RDCR          0x35    /* Read configuration register */
#define SPINOR_OP_RDFSR         0x70    /* Read flag status register */
#define SPINOR_OP_CLFSR         0x50    /* Clear flag status register */
#define SPINOR_OP_RDEAR         0xc8    /* Read Extended Address Register */
#define SPINOR_OP_WREAR         0xc5    /* Write Extended Address Register */
#define SPINOR_OP_SRSTEN        0x66    /* Software Reset Enable */
#define SPINOR_OP_SRST          0x99    /* Software Reset */

/* 4-byte address opcodes - used on Spansion and some Macronix flashes. */
#define SPINOR_OP_READ_4B       0x13    /* Read data bytes (low frequency) */
#define SPINOR_OP_READ_FAST_4B  0x0c    /* Read data bytes (high frequency) */
#define SPINOR_OP_READ_1_1_2_4B 0x3c    /* Read data bytes (Dual Output SPI) */
#define SPINOR_OP_READ_1_2_2_4B 0xbc    /* Read data bytes (Dual I/O SPI) */
#define SPINOR_OP_READ_1_1_4_4B 0x6c    /* Read data bytes (Quad Output SPI) */
#define SPINOR_OP_READ_1_4_4_4B 0xec    /* Read data bytes (Quad I/O SPI) */
#define SPINOR_OP_READ_1_1_8_4B 0x7c    /* Read data bytes (Octal Output SPI) */
#define SPINOR_OP_READ_1_8_8_4B 0xcc    /* Read data bytes (Octal I/O SPI) */
#define SPINOR_OP_PP_4B         0x12    /* Page program (up to 256 bytes) */
#define SPINOR_OP_PP_1_1_4_4B   0x34    /* Quad page program */
#define SPINOR_OP_PP_1_4_4_4B   0x3e    /* Quad page program */
#define SPINOR_OP_PP_1_1_8_4B   0x84    /* Octal page program */
#define SPINOR_OP_PP_1_8_8_4B   0x8e    /* Octal page program */
#define SPINOR_OP_BE_4K_4B      0x21    /* Erase 4KiB block */
#define SPINOR_OP_BE_32K_4B     0x5c    /* Erase 32KiB block */
#define SPINOR_OP_SE_4B         0xdc    /* Sector erase (usually 64KiB) */

/* Double Transfer Rate opcodes - defined in JEDEC JESD216B. */
#define SPINOR_OP_READ_1_1_1_DTR        0x0d
#define SPINOR_OP_READ_1_2_2_DTR        0xbd
#define SPINOR_OP_READ_1_4_4_DTR        0xed

#define SPINOR_OP_READ_1_1_1_DTR_4B     0x0e
#define SPINOR_OP_READ_1_2_2_DTR_4B     0xbe
#define SPINOR_OP_READ_1_4_4_DTR_4B     0xee

/* Used for SST flashes only. */
#define SPINOR_OP_BP            0x02    /* Byte program */
#define SPINOR_OP_WRDI          0x04    /* Write disable */
#define SPINOR_OP_AAI_WP        0xad    /* Auto address increment word program */

/* Used for SST26* flashes only. */
#define SPINOR_OP_READ_BPR      0x72    /* Read block protection register */
#define SPINOR_OP_WRITE_BPR     0x42    /* Write block protection register */

/* Used for S3AN flashes only */
#define SPINOR_OP_XSE           0x50    /* Sector erase */
#define SPINOR_OP_XPP           0x82    /* Page program */
#define SPINOR_OP_XRDSR         0xd7    /* Read status register */

#define XSR_PAGESIZE            BIT(0)  /* Page size in Po2 or Linear */
#define XSR_RDY                 BIT(7)  /* Ready */

/* Used for Macronix and Winbond flashes. */
#define SPINOR_OP_EN4B          0xb7    /* Enter 4-byte mode */
#define SPINOR_OP_EX4B          0xe9    /* Exit 4-byte mode */

/* Used for Spansion flashes only. */
#define SPINOR_OP_BRWR          0x17    /* Bank register write */
#define SPINOR_OP_BRRD          0x16    /* Bank register read */
#define SPINOR_OP_CLSR          0x30    /* Clear status register 1 */
#define SPINOR_OP_EX4B_CYPRESS  0xB8    /* Exit 4-byte mode */
#define SPINOR_OP_RDAR          0x65    /* Read any register */
#define SPINOR_OP_WRAR          0x71    /* Write any register */
#define SPINOR_REG_ADDR_STR1V   0x00800000
#define SPINOR_REG_ADDR_CFR1V   0x00800002
#define SPINOR_REG_ADDR_CFR3V   0x00800004
#define CFR3V_UNHYSA            BIT(3)  /* Uniform sectors or not */
#define CFR3V_PGMBUF            BIT(4)  /* Program buffer size */

/* Used for Micron flashes only. */
#define SPINOR_OP_RD_EVCR       0x65    /* Read EVCR register */
#define SPINOR_OP_WD_EVCR       0x61    /* Write EVCR register */
#define SPINOR_OP_MT_DTR_RD     0xfd    /* Fast Read opcode in DTR mode */
#define SPINOR_OP_MT_RD_ANY_REG 0x85    /* Read volatile register */
#define SPINOR_OP_MT_WR_ANY_REG 0x81    /* Write volatile register */
#define SPINOR_REG_MT_CFR0V     0x00    /* For setting octal DTR mode */
#define SPINOR_REG_MT_CFR1V     0x01    /* For setting dummy cycles */
#define SPINOR_MT_OCT_DTR       0xe7    /* Enable Octal DTR with DQS. */

/* Status Register bits. */
#define SR_WIP                  BIT(0)  /* Write in progress */
#define SR_WEL                  BIT(1)  /* Write enable latch */
/* meaning of other SR_* bits may differ between vendors */
#define SR_BP0                  BIT(2)  /* Block protect 0 */
#define SR_BP1                  BIT(3)  /* Block protect 1 */
#define SR_BP2                  BIT(4)  /* Block protect 2 */
#define SR_TB                   BIT(5)  /* Top/Bottom protect */
#define SR_SRWD                 BIT(7)  /* SR write protect */
/* Spansion/Cypress specific status bits */
#define SR_E_ERR                BIT(5)
#define SR_P_ERR                BIT(6)

#define SR_QUAD_EN_MX           BIT(6)  /* Macronix Quad I/O */

/* Enhanced Volatile Configuration Register bits */
#define EVCR_QUAD_EN_MICRON     BIT(7)  /* Micron Quad I/O */

/* Flag Status Register bits */
#define FSR_READY               BIT(7)  /* Device status, 0 = Busy, 1 = Ready */
#define FSR_E_ERR               BIT(5)  /* Erase operation status */
#define FSR_P_ERR               BIT(4)  /* Program operation status */
#define FSR_PT_ERR              BIT(1)  /* Protection error bit */

/* Configuration Register bits. */
#define CR_QUAD_EN_SPAN         BIT(1)  /* Spansion Quad I/O */

/* Status Register 2 bits. */
#define SR2_QUAD_EN_BIT7        BIT(7)

/* For Cypress flash. */
#define SPINOR_OP_RD_ANY_REG                    0x65    /* Read any register */
#define SPINOR_OP_WR_ANY_REG                    0x71    /* Write any register */
#define SPINOR_OP_S28_SE_4K                     0x21
#define SPINOR_REG_CYPRESS_CFR2V                0x00800003
#define SPINOR_REG_CYPRESS_CFR2V_MEMLAT_11_24   0xb
#define SPINOR_REG_CYPRESS_CFR3V                0x00800004
#define SPINOR_REG_CYPRESS_CFR3V_PGSZ           BIT(4) /* Page size. */
#define SPINOR_REG_CYPRESS_CFR3V_UNISECT        BIT(3) /* Uniform sector mode */
#define SPINOR_REG_CYPRESS_CFR5V                0x00800006
#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN     0x3
#define SPINOR_OP_CYPRESS_RD_FAST               0xee

/* Supported SPI protocols */
#define SNOR_PROTO_INST_MASK    GENMASK(23, 16)
#define SNOR_PROTO_INST_SHIFT   16
#define SNOR_PROTO_INST(_nbits) \
        ((((unsigned long)(_nbits)) << SNOR_PROTO_INST_SHIFT) & \
         SNOR_PROTO_INST_MASK)

#define SNOR_PROTO_ADDR_MASK    GENMASK(15, 8)
#define SNOR_PROTO_ADDR_SHIFT   8
#define SNOR_PROTO_ADDR(_nbits) \
        ((((unsigned long)(_nbits)) << SNOR_PROTO_ADDR_SHIFT) & \
         SNOR_PROTO_ADDR_MASK)

#define SNOR_PROTO_DATA_MASK    GENMASK(7, 0)
#define SNOR_PROTO_DATA_SHIFT   0
#define SNOR_PROTO_DATA(_nbits) \
        ((((unsigned long)(_nbits)) << SNOR_PROTO_DATA_SHIFT) & \
         SNOR_PROTO_DATA_MASK)

#define SNOR_PROTO_IS_DTR       BIT(24) /* Double Transfer Rate */

#define SNOR_PROTO_STR(_inst_nbits, _addr_nbits, _data_nbits)   \
        (SNOR_PROTO_INST(_inst_nbits) |                         \
         SNOR_PROTO_ADDR(_addr_nbits) |                         \
         SNOR_PROTO_DATA(_data_nbits))
#define SNOR_PROTO_DTR(_inst_nbits, _addr_nbits, _data_nbits)   \
        (SNOR_PROTO_IS_DTR |                                    \
         SNOR_PROTO_STR(_inst_nbits, _addr_nbits, _data_nbits))

enum spi_nor_protocol {
        SNOR_PROTO_1_1_1 = SNOR_PROTO_STR(1, 1, 1),
        SNOR_PROTO_1_1_2 = SNOR_PROTO_STR(1, 1, 2),
        SNOR_PROTO_1_1_4 = SNOR_PROTO_STR(1, 1, 4),
        SNOR_PROTO_1_1_8 = SNOR_PROTO_STR(1, 1, 8),
        SNOR_PROTO_1_2_2 = SNOR_PROTO_STR(1, 2, 2),
        SNOR_PROTO_1_4_4 = SNOR_PROTO_STR(1, 4, 4),
        SNOR_PROTO_1_8_8 = SNOR_PROTO_STR(1, 8, 8),
        SNOR_PROTO_2_2_2 = SNOR_PROTO_STR(2, 2, 2),
        SNOR_PROTO_4_4_4 = SNOR_PROTO_STR(4, 4, 4),
        SNOR_PROTO_8_8_8 = SNOR_PROTO_STR(8, 8, 8),

        SNOR_PROTO_1_1_1_DTR = SNOR_PROTO_DTR(1, 1, 1),
        SNOR_PROTO_1_2_2_DTR = SNOR_PROTO_DTR(1, 2, 2),
        SNOR_PROTO_1_4_4_DTR = SNOR_PROTO_DTR(1, 4, 4),
        SNOR_PROTO_1_8_8_DTR = SNOR_PROTO_DTR(1, 8, 8),
        SNOR_PROTO_8_8_8_DTR = SNOR_PROTO_DTR(8, 8, 8),
};

static inline bool spi_nor_protocol_is_dtr(enum spi_nor_protocol proto)
{
        return !!(proto & SNOR_PROTO_IS_DTR);
}

static inline u8 spi_nor_get_protocol_inst_nbits(enum spi_nor_protocol proto)
{
        return ((unsigned long)(proto & SNOR_PROTO_INST_MASK)) >>
                SNOR_PROTO_INST_SHIFT;
}

static inline u8 spi_nor_get_protocol_addr_nbits(enum spi_nor_protocol proto)
{
        return ((unsigned long)(proto & SNOR_PROTO_ADDR_MASK)) >>
                SNOR_PROTO_ADDR_SHIFT;
}

static inline u8 spi_nor_get_protocol_data_nbits(enum spi_nor_protocol proto)
{
        return ((unsigned long)(proto & SNOR_PROTO_DATA_MASK)) >>
                SNOR_PROTO_DATA_SHIFT;
}

static inline u8 spi_nor_get_protocol_width(enum spi_nor_protocol proto)
{
        return spi_nor_get_protocol_data_nbits(proto);
}

#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,
};

enum spi_nor_option_flags {
        SNOR_F_USE_FSR          = BIT(0),
        SNOR_F_HAS_SR_TB        = BIT(1),
        SNOR_F_NO_OP_CHIP_ERASE = BIT(2),
        SNOR_F_S3AN_ADDR_DEFAULT = BIT(3),
        SNOR_F_READY_XSR_RDY    = BIT(4),
        SNOR_F_USE_CLSR         = BIT(5),
        SNOR_F_BROKEN_RESET     = BIT(6),
        SNOR_F_SOFT_RESET       = BIT(7),
};

struct spi_nor;

/**
 * struct spi_nor_hwcaps - Structure for describing the hardware capabilies
 * supported by the SPI controller (bus master).
 * @mask:               the bitmask listing all the supported hw capabilies
 */
struct spi_nor_hwcaps {
        u32     mask;
};

/*
 *(Fast) Read capabilities.
 * MUST be ordered by priority: the higher bit position, the higher priority.
 * As a matter of performances, it is relevant to use Octo SPI protocols first,
 * then Quad SPI protocols before Dual SPI protocols, Fast Read and lastly
 * (Slow) Read.
 */
#define SNOR_HWCAPS_READ_MASK           GENMASK(15, 0)
#define SNOR_HWCAPS_READ                BIT(0)
#define SNOR_HWCAPS_READ_FAST           BIT(1)
#define SNOR_HWCAPS_READ_1_1_1_DTR      BIT(2)

#define SNOR_HWCAPS_READ_DUAL           GENMASK(6, 3)
#define SNOR_HWCAPS_READ_1_1_2          BIT(3)
#define SNOR_HWCAPS_READ_1_2_2          BIT(4)
#define SNOR_HWCAPS_READ_2_2_2          BIT(5)
#define SNOR_HWCAPS_READ_1_2_2_DTR      BIT(6)

#define SNOR_HWCAPS_READ_QUAD           GENMASK(10, 7)
#define SNOR_HWCAPS_READ_1_1_4          BIT(7)
#define SNOR_HWCAPS_READ_1_4_4          BIT(8)
#define SNOR_HWCAPS_READ_4_4_4          BIT(9)
#define SNOR_HWCAPS_READ_1_4_4_DTR      BIT(10)

#define SNOR_HWCPAS_READ_OCTO           GENMASK(15, 11)
#define SNOR_HWCAPS_READ_1_1_8          BIT(11)
#define SNOR_HWCAPS_READ_1_8_8          BIT(12)
#define SNOR_HWCAPS_READ_8_8_8          BIT(13)
#define SNOR_HWCAPS_READ_1_8_8_DTR      BIT(14)
#define SNOR_HWCAPS_READ_8_8_8_DTR      BIT(15)

/*
 * Page Program capabilities.
 * MUST be ordered by priority: the higher bit position, the higher priority.
 * Like (Fast) Read capabilities, Octo/Quad SPI protocols are preferred to the
 * legacy SPI 1-1-1 protocol.
 * Note that Dual Page Programs are not supported because there is no existing
 * JEDEC/SFDP standard to define them. Also at this moment no SPI flash memory
 * implements such commands.
 */
#define SNOR_HWCAPS_PP_MASK             GENMASK(23, 16)
#define SNOR_HWCAPS_PP                  BIT(16)

#define SNOR_HWCAPS_PP_QUAD             GENMASK(19, 17)
#define SNOR_HWCAPS_PP_1_1_4            BIT(17)
#define SNOR_HWCAPS_PP_1_4_4            BIT(18)
#define SNOR_HWCAPS_PP_4_4_4            BIT(19)

#define SNOR_HWCAPS_PP_OCTO             GENMASK(23, 20)
#define SNOR_HWCAPS_PP_1_1_8            BIT(20)
#define SNOR_HWCAPS_PP_1_8_8            BIT(21)
#define SNOR_HWCAPS_PP_8_8_8            BIT(22)
#define SNOR_HWCAPS_PP_8_8_8_DTR        BIT(23)

#define SNOR_HWCAPS_X_X_X       (SNOR_HWCAPS_READ_2_2_2 |       \
                                 SNOR_HWCAPS_READ_4_4_4 |       \
                                 SNOR_HWCAPS_READ_8_8_8 |       \
                                 SNOR_HWCAPS_PP_4_4_4 |         \
                                 SNOR_HWCAPS_PP_8_8_8)

#define SNOR_HWCAPS_X_X_X_DTR   (SNOR_HWCAPS_READ_8_8_8_DTR |   \
                                 SNOR_HWCAPS_PP_8_8_8_DTR)

#define SNOR_HWCAPS_DTR         (SNOR_HWCAPS_READ_1_1_1_DTR |   \
                                 SNOR_HWCAPS_READ_1_2_2_DTR |   \
                                 SNOR_HWCAPS_READ_1_4_4_DTR |   \
                                 SNOR_HWCAPS_READ_1_8_8_DTR)

#define SNOR_HWCAPS_ALL         (SNOR_HWCAPS_READ_MASK |        \
                                 SNOR_HWCAPS_PP_MASK)

struct spi_nor_read_command {
        u8                      num_mode_clocks;
        u8                      num_wait_states;
        u8                      opcode;
        enum spi_nor_protocol   proto;
};

struct spi_nor_pp_command {
        u8                      opcode;
        enum spi_nor_protocol   proto;
};

enum spi_nor_read_command_index {
        SNOR_CMD_READ,
        SNOR_CMD_READ_FAST,
        SNOR_CMD_READ_1_1_1_DTR,

        /* Dual SPI */
        SNOR_CMD_READ_1_1_2,
        SNOR_CMD_READ_1_2_2,
        SNOR_CMD_READ_2_2_2,
        SNOR_CMD_READ_1_2_2_DTR,

        /* Quad SPI */
        SNOR_CMD_READ_1_1_4,
        SNOR_CMD_READ_1_4_4,
        SNOR_CMD_READ_4_4_4,
        SNOR_CMD_READ_1_4_4_DTR,

        /* Octo SPI */
        SNOR_CMD_READ_1_1_8,
        SNOR_CMD_READ_1_8_8,
        SNOR_CMD_READ_8_8_8,
        SNOR_CMD_READ_1_8_8_DTR,
        SNOR_CMD_READ_8_8_8_DTR,

        SNOR_CMD_READ_MAX
};

enum spi_nor_pp_command_index {
        SNOR_CMD_PP,

        /* Quad SPI */
        SNOR_CMD_PP_1_1_4,
        SNOR_CMD_PP_1_4_4,
        SNOR_CMD_PP_4_4_4,

        /* Octo SPI */
        SNOR_CMD_PP_1_1_8,
        SNOR_CMD_PP_1_8_8,
        SNOR_CMD_PP_8_8_8,
        SNOR_CMD_PP_8_8_8_DTR,

        SNOR_CMD_PP_MAX
};

struct spi_nor_flash_parameter {
        u64                             size;
        u32                             page_size;
        u8                              rdsr_dummy;
        u8                              rdsr_addr_nbytes;

        struct spi_nor_hwcaps           hwcaps;
        struct spi_nor_read_command     reads[SNOR_CMD_READ_MAX];
        struct spi_nor_pp_command       page_programs[SNOR_CMD_PP_MAX];

        int (*quad_enable)(struct spi_nor *nor);
};

/**
 * enum spi_nor_cmd_ext - describes the command opcode extension in DTR mode
 * @SPI_MEM_NOR_NONE: no extension. This is the default, and is used in Legacy
 *                    SPI mode
 * @SPI_MEM_NOR_REPEAT: the extension is same as the opcode
 * @SPI_MEM_NOR_INVERT: the extension is the bitwise inverse of the opcode
 * @SPI_MEM_NOR_HEX: the extension is any hex value. The command and opcode
 *                   combine to form a 16-bit opcode.
 */
enum spi_nor_cmd_ext {
        SPI_NOR_EXT_NONE = 0,
        SPI_NOR_EXT_REPEAT,
        SPI_NOR_EXT_INVERT,
        SPI_NOR_EXT_HEX,
};

/**
 * struct flash_info - Forward declaration of a structure used internally by
 *                     spi_nor_scan()
 */
struct flash_info;

/*
 * TODO: Remove, once all users of spi_flash interface are moved to MTD
 *
struct spi_flash {
 *      Defined below (keep this text to enable searching for spi_flash decl)
 * }
 */
#ifndef DT_PLAT_C
#define spi_flash spi_nor
#endif

/**
 * 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.
 * @info:               spi-nor part JDEC MFR id and other info
 * @manufacturer_sfdp:  manufacturer specific SFDP table
 * @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
 * @rdsr_dummy          dummy cycles needed for Read Status Register command.
 * @rdsr_addr_nbytes:   dummy address bytes needed for Read Status Register
 *                      command.
 * @bank_read_cmd:      Bank read cmd
 * @bank_write_cmd:     Bank write cmd
 * @bank_curr:          Current flash bank
 * @sst_write_second:   used by the SST write operation
 * @flags:              flag options for the current SPI-NOR (SNOR_F_*)
 * @read_proto:         the SPI protocol for read operations
 * @write_proto:        the SPI protocol for write operations
 * @reg_proto           the SPI protocol for read_reg/write_reg/erase operations
 * @cmd_buf:            used by the write_reg
 * @cmd_ext_type:       the command opcode extension for DTR mode.
 * @fixups:             flash-specific fixup hooks.
 * @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_reg:           [DRIVER-SPECIFIC] read out the register
 * @write_reg:          [DRIVER-SPECIFIC] write data to the register
 * @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; 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
 * @quad_enable:        [FLASH-SPECIFIC] enables SPI NOR quad mode
 * @octal_dtr_enable:   [FLASH-SPECIFIC] enables SPI NOR octal DTR mode.
 * @ready:              [FLASH-SPECIFIC] check if the flash is ready
 * @priv:               the private data
 */
struct spi_nor {
        struct mtd_info         mtd;
        struct udevice          *dev;
        struct spi_slave        *spi;
        const struct flash_info *info;
        u8                      *manufacturer_sfdp;
        u32                     page_size;
        u8                      addr_width;
        u8                      erase_opcode;
        u8                      read_opcode;
        u8                      read_dummy;
        u8                      program_opcode;
        u8                      rdsr_dummy;
        u8                      rdsr_addr_nbytes;
#ifdef CONFIG_SPI_FLASH_BAR
        u8                      bank_read_cmd;
        u8                      bank_write_cmd;
        u8                      bank_curr;
#endif
        enum spi_nor_protocol   read_proto;
        enum spi_nor_protocol   write_proto;
        enum spi_nor_protocol   reg_proto;
        bool                    sst_write_second;
        u32                     flags;
        u8                      cmd_buf[SPI_NOR_MAX_CMD_SIZE];
        enum spi_nor_cmd_ext    cmd_ext_type;
        struct spi_nor_fixups   *fixups;

        int (*setup)(struct spi_nor *nor, const struct flash_info *info,
                     const struct spi_nor_flash_parameter *params);
        int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
        void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
        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);

        ssize_t (*read)(struct spi_nor *nor, loff_t from,
                        size_t len, u_char *read_buf);
        ssize_t (*write)(struct spi_nor *nor, loff_t to,
                         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 (*quad_enable)(struct spi_nor *nor);
        int (*octal_dtr_enable)(struct spi_nor *nor);
        int (*ready)(struct spi_nor *nor);

        void *priv;
        char mtd_name[MTD_NAME_SIZE(MTD_DEV_TYPE_NOR)];
/* Compatibility for spi_flash, remove once sf layer is merged with mtd */
        const char *name;
        u32 size;
        u32 sector_size;
        u32 erase_size;
};

#ifndef __UBOOT__
static inline void spi_nor_set_flash_node(struct spi_nor *nor,
                                          const struct device_node *np)
{
        mtd_set_of_node(&nor->mtd, np);
}

static inline const struct
device_node *spi_nor_get_flash_node(struct spi_nor *nor)
{
        return mtd_get_of_node(&nor->mtd);
}
#endif /* __UBOOT__ */

/**
 * spi_nor_scan() - scan the SPI NOR
 * @nor:        the spi_nor structure
 *
 * The drivers can use this function to scan the SPI NOR.
 * In the scanning, it will try to get all the necessary information to
 * fill the mtd_info{} and the spi_nor{}.
 *
 * Return: 0 for success, others for failure.
 */
int spi_nor_scan(struct spi_nor *nor);

#if CONFIG_IS_ENABLED(SPI_FLASH_TINY)
static inline int spi_nor_remove(struct spi_nor *nor)
{
        return 0;
}
#else
/**
 * spi_nor_remove() - perform cleanup before booting to the next stage
 * @nor:        the spi_nor structure
 *
 * Return: 0 for success, -errno for failure.
 */
int spi_nor_remove(struct spi_nor *nor);
#endif

#endif