/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2014 Freescale Semiconductor, Inc.
 */

#ifndef __LINUX_MTD_SPI_NOR_H
#define __LINUX_MTD_SPI_NOR_H

#include <linux/bitops.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/mtd.h>
#include <linux/spi/spi-mem.h>

/*
 * 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_WRDI          0x04    /* Write disable */
#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 */

/* 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_AAI_WP        0xad    /* Auto address increment word program */

/* 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_CLSR          0x30    /* Clear status register 1 */

/* Used for Micron flashes only. */
#define SPINOR_OP_RD_EVCR      0x65    /* Read EVCR register */
#define SPINOR_OP_WD_EVCR      0x61    /* Write EVCR register */

/* 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_BP3                  BIT(5)  /* Block protect 3 */
#define SR_TB_BIT5              BIT(5)  /* Top/Bottom protect */
#define SR_BP3_BIT6             BIT(6)  /* Block protect 3 */
#define SR_TB_BIT6              BIT(6)  /* 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 SR1_QUAD_EN_BIT6        BIT(6)

#define SR_BP_SHIFT             2

/* 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 */

/* Status Register 2 bits. */
#define SR2_QUAD_EN_BIT1        BIT(1)
#define SR2_QUAD_EN_BIT7        BIT(7)

/* 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),
};

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);
}

/**
 * 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 Octal SPI protocols first,
 * then Quad SPI protocols before Dual SPI protocols, Fast Read and lastly
 * (Slow) Read.
 */
#define SNOR_HWCAPS_READ_MASK           GENMASK(14, 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_HWCAPS_READ_OCTAL          GENMASK(14, 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)

/*
 * Page Program capabilities.
 * MUST be ordered by priority: the higher bit position, the higher priority.
 * Like (Fast) Read capabilities, Octal/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(22, 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_OCTAL    GENMASK(22, 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_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_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)

/* Forward declaration that is used in 'struct spi_nor_controller_ops' */
struct spi_nor;

/**
 * struct spi_nor_controller_ops - SPI NOR controller driver specific
 *                                 operations.
 * @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:           read out the register.
 * @write_reg:          write data to the register.
 * @read:               read data from the SPI NOR.
 * @write:              write data to the SPI NOR.
 * @erase:              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().
 */
struct spi_nor_controller_ops {
        int (*prepare)(struct spi_nor *nor);
        void (*unprepare)(struct spi_nor *nor);
        int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len);
        int (*write_reg)(struct spi_nor *nor, u8 opcode, const u8 *buf,
                         size_t len);

        ssize_t (*read)(struct spi_nor *nor, loff_t from, size_t len, u8 *buf);
        ssize_t (*write)(struct spi_nor *nor, loff_t to, size_t len,
                         const u8 *buf);
        int (*erase)(struct spi_nor *nor, loff_t offs);
};

/*
 * Forward declarations that are used internally by the core and manufacturer
 * drivers.
 */
struct flash_info;
struct spi_nor_manufacturer;
struct spi_nor_flash_parameter;

/**
 * struct spi_nor - Structure for defining the SPI NOR layer
 * @mtd:                an mtd_info structure
 * @lock:               the lock for the read/write/erase/lock/unlock operations
 * @dev:                pointer to an SPI device or an SPI NOR controller device
 * @spimem:             pointer to the SPI memory device
 * @bouncebuf:          bounce buffer used when the buffer passed by the MTD
 *                      layer is not DMA-able
 * @bouncebuf_size:     size of the bounce buffer
 * @info:               SPI NOR part JEDEC MFR ID and other info
 * @manufacturer:       SPI NOR manufacturer
 * @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
 * @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
 * @controller_ops:     SPI NOR controller driver specific operations.
 * @params:             [FLASH-SPECIFIC] SPI NOR flash parameters and settings.
 *                      The structure includes legacy flash parameters and
 *                      settings that can be overwritten by the spi_nor_fixups
 *                      hooks, or dynamically when parsing the SFDP tables.
 * @dirmap:             pointers to struct spi_mem_dirmap_desc for reads/writes.
 * @priv:               pointer to the private data
 */
struct spi_nor {
        struct mtd_info         mtd;
        struct mutex            lock;
        struct device           *dev;
        struct spi_mem          *spimem;
        u8                      *bouncebuf;
        size_t                  bouncebuf_size;
        const struct flash_info *info;
        const struct spi_nor_manufacturer *manufacturer;
        u32                     page_size;
        u8                      addr_width;
        u8                      erase_opcode;
        u8                      read_opcode;
        u8                      read_dummy;
        u8                      program_opcode;
        enum spi_nor_protocol   read_proto;
        enum spi_nor_protocol   write_proto;
        enum spi_nor_protocol   reg_proto;
        bool                    sst_write_second;
        u32                     flags;

        const struct spi_nor_controller_ops *controller_ops;

        struct spi_nor_flash_parameter *params;

        struct {
                struct spi_mem_dirmap_desc *rdesc;
                struct spi_mem_dirmap_desc *wdesc;
        } dirmap;

        void *priv;
};

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

static inline struct device_node *spi_nor_get_flash_node(struct spi_nor *nor)
{
        return mtd_get_of_node(&nor->mtd);
}

/**
 * spi_nor_scan() - scan the SPI NOR
 * @nor:        the spi_nor structure
 * @name:       the chip type name
 * @hwcaps:     the hardware capabilities supported by the controller driver
 *
 * The drivers can use this fuction 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{}.
 *
 * The chip type name can be provided through the @name parameter.
 *
 * Return: 0 for success, others for failure.
 */
int spi_nor_scan(struct spi_nor *nor, const char *name,
                 const struct spi_nor_hwcaps *hwcaps);

/**
 * spi_nor_restore_addr_mode() - restore the status of SPI NOR
 * @nor:        the spi_nor structure
 */
void spi_nor_restore(struct spi_nor *nor);

#endif