drivers/mtd/spi-nor/micron-st.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2005, Intec Automation Inc.
  * Copyright (C) 2014, Freescale Semiconductor, Inc.
  */

 #include <linux/mtd/spi-nor.h>

 #include "core.h"

 /* flash_info mfr_flag. Used to read proprietary FSR register. */
 #define USE_FSR		BIT(0)

 #define SPINOR_OP_MT_DIE_ERASE	0xc4	/* Chip (die) erase opcode */
 #define SPINOR_OP_RDFSR		0x70	/* Read flag status register */
 #define SPINOR_OP_CLFSR		0x50	/* Clear flag status 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_REG_MT_CFR1V_DEF	0x1f	/* Default dummy cycles */
 #define SPINOR_MT_OCT_DTR	0xe7	/* Enable Octal DTR. */
 #define SPINOR_MT_EXSPI		0xff	/* Enable Extended SPI (default) */

 /* 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 */

 /* Micron ST SPI NOR flash operations. */
 #define MICRON_ST_NOR_WR_ANY_REG_OP(naddr, addr, ndata, buf)		\
 	SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 0),		\
 		   SPI_MEM_OP_ADDR(naddr, addr, 0),			\
 		   SPI_MEM_OP_NO_DUMMY,					\
 		   SPI_MEM_OP_DATA_OUT(ndata, buf, 0))

 #define MICRON_ST_RDFSR_OP(buf)						\
 	SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDFSR, 0),			\
 		   SPI_MEM_OP_NO_ADDR,					\
 		   SPI_MEM_OP_NO_DUMMY,					\
 		   SPI_MEM_OP_DATA_IN(1, buf, 0))

 #define MICRON_ST_CLFSR_OP						\
 	SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_CLFSR, 0),			\
 		   SPI_MEM_OP_NO_ADDR,					\
 		   SPI_MEM_OP_NO_DUMMY,					\
 		   SPI_MEM_OP_NO_DATA)

 static int micron_st_nor_octal_dtr_en(struct spi_nor *nor)
 {
 	struct spi_mem_op op;
 	u8 *buf = nor->bouncebuf;
 	int ret;
 	u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;

 	/* Use 20 dummy cycles for memory array reads. */
 	*buf = 20;
 	op = (struct spi_mem_op)
 		MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
 					    SPINOR_REG_MT_CFR1V, 1, buf);
 	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
 	if (ret)
 		return ret;

 	buf[0] = SPINOR_MT_OCT_DTR;
 	op = (struct spi_mem_op)
 		MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
 					    SPINOR_REG_MT_CFR0V, 1, buf);
 	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
 	if (ret)
 		return ret;

 	/* Read flash ID to make sure the switch was successful. */
 	ret = spi_nor_read_id(nor, 0, 8, buf, SNOR_PROTO_8_8_8_DTR);
 	if (ret) {
 		dev_dbg(nor->dev, "error %d reading JEDEC ID after enabling 8D-8D-8D mode\n", ret);
 		return ret;
 	}

 	if (memcmp(buf, nor->info->id->bytes, nor->info->id->len))
 		return -EINVAL;

 	return 0;
 }

 static int micron_st_nor_octal_dtr_dis(struct spi_nor *nor)
 {
 	struct spi_mem_op op;
 	u8 *buf = nor->bouncebuf;
 	int ret;

 	/*
 	 * The register is 1-byte wide, but 1-byte transactions are not allowed
 	 * in 8D-8D-8D mode. The next register is the dummy cycle configuration
 	 * register. Since the transaction needs to be at least 2 bytes wide,
 	 * set the next register to its default value. This also makes sense
 	 * because the value was changed when enabling 8D-8D-8D mode, it should
 	 * be reset when disabling.
 	 */
 	buf[0] = SPINOR_MT_EXSPI;
 	buf[1] = SPINOR_REG_MT_CFR1V_DEF;
 	op = (struct spi_mem_op)
 		MICRON_ST_NOR_WR_ANY_REG_OP(nor->addr_nbytes,
 					    SPINOR_REG_MT_CFR0V, 2, buf);
 	ret = spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
 	if (ret)
 		return ret;

 	/* Read flash ID to make sure the switch was successful. */
 	ret = spi_nor_read_id(nor, 0, 0, buf, SNOR_PROTO_1_1_1);
 	if (ret) {
 		dev_dbg(nor->dev, "error %d reading JEDEC ID after disabling 8D-8D-8D mode\n", ret);
 		return ret;
 	}

 	if (memcmp(buf, nor->info->id->bytes, nor->info->id->len))
 		return -EINVAL;

 	return 0;
 }

 static int micron_st_nor_set_octal_dtr(struct spi_nor *nor, bool enable)
 {
 	return enable ? micron_st_nor_octal_dtr_en(nor) :
 			micron_st_nor_octal_dtr_dis(nor);
 }

 static void mt35xu512aba_default_init(struct spi_nor *nor)
 {
 	nor->params->set_octal_dtr = micron_st_nor_set_octal_dtr;
 }

 static int mt35xu512aba_post_sfdp_fixup(struct spi_nor *nor)
 {
 	/* Set the Fast Read settings. */
 	nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
 	spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_8_8_8_DTR],
 				  0, 20, SPINOR_OP_MT_DTR_RD,
 				  SNOR_PROTO_8_8_8_DTR);

 	nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
 	nor->params->rdsr_dummy = 8;
 	nor->params->rdsr_addr_nbytes = 0;

 	/*
 	 * The BFPT quad enable field is set to a reserved value so the quad
 	 * enable function is ignored by spi_nor_parse_bfpt(). Make sure we
 	 * disable it.
 	 */
 	nor->params->quad_enable = NULL;

 	return 0;
 }

 static const struct spi_nor_fixups mt35xu512aba_fixups = {
 	.default_init = mt35xu512aba_default_init,
 	.post_sfdp = mt35xu512aba_post_sfdp_fixup,
 };

 static const struct flash_info micron_nor_parts[] = {
 	{
 		.id = SNOR_ID(0x2c, 0x5b, 0x1a),
 		.name = "mt35xu512aba",
 		.sector_size = SZ_128K,
 		.size = SZ_64M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_OCTAL_READ |
 				 SPI_NOR_OCTAL_DTR_READ | SPI_NOR_OCTAL_DTR_PP,
 		.mfr_flags = USE_FSR,
 		.fixup_flags = SPI_NOR_4B_OPCODES | SPI_NOR_IO_MODE_EN_VOLATILE,
 		.fixups = &mt35xu512aba_fixups,
 	}, {
 		.id = SNOR_ID(0x2c, 0x5b, 0x1c),
 		.name = "mt35xu02g",
 		.sector_size = SZ_128K,
 		.size = SZ_256M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_OCTAL_READ,
 		.mfr_flags = USE_FSR,
 		.fixup_flags = SPI_NOR_4B_OPCODES,
 	},
 };

 static int mt25qu512a_post_bfpt_fixup(struct spi_nor *nor,
 				      const struct sfdp_parameter_header *bfpt_header,
 				      const struct sfdp_bfpt *bfpt)
 {
 	nor->flags &= ~SNOR_F_HAS_16BIT_SR;
 	return 0;
 }

 static struct spi_nor_fixups mt25qu512a_fixups = {
 	.post_bfpt = mt25qu512a_post_bfpt_fixup,
 };

 static int st_nor_four_die_late_init(struct spi_nor *nor)
 {
 	struct spi_nor_flash_parameter *params = nor->params;

 	params->die_erase_opcode = SPINOR_OP_MT_DIE_ERASE;
 	params->n_dice = 4;

 	/*
 	 * Unfortunately the die erase opcode does not have a 4-byte opcode
 	 * correspondent for these flashes. The SFDP 4BAIT table fails to
 	 * consider the die erase too. We're forced to enter in the 4 byte
 	 * address mode in order to benefit of the die erase.
 	 */
 	return spi_nor_set_4byte_addr_mode(nor, true);
 }

 static int st_nor_two_die_late_init(struct spi_nor *nor)
 {
 	struct spi_nor_flash_parameter *params = nor->params;

 	params->die_erase_opcode = SPINOR_OP_MT_DIE_ERASE;
 	params->n_dice = 2;

 	/*
 	 * Unfortunately the die erase opcode does not have a 4-byte opcode
 	 * correspondent for these flashes. The SFDP 4BAIT table fails to
 	 * consider the die erase too. We're forced to enter in the 4 byte
 	 * address mode in order to benefit of the die erase.
 	 */
 	return spi_nor_set_4byte_addr_mode(nor, true);
 }

 static struct spi_nor_fixups n25q00_fixups = {
 	.late_init = st_nor_four_die_late_init,
 };

 static struct spi_nor_fixups mt25q01_fixups = {
 	.late_init = st_nor_two_die_late_init,
 };

 static struct spi_nor_fixups mt25q02_fixups = {
 	.late_init = st_nor_four_die_late_init,
 };

 static const struct flash_info st_nor_parts[] = {
 	{
 		.name = "m25p05-nonjedec",
 		.sector_size = SZ_32K,
 		.size = SZ_64K,
 	}, {
 		.name = "m25p10-nonjedec",
 		.sector_size = SZ_32K,
 		.size = SZ_128K,
 	}, {
 		.name = "m25p20-nonjedec",
 		.size = SZ_256K,
 	}, {
 		.name = "m25p40-nonjedec",
 		.size = SZ_512K,
 	}, {
 		.name = "m25p80-nonjedec",
 		.size = SZ_1M,
 	}, {
 		.name = "m25p16-nonjedec",
 		.size = SZ_2M,
 	}, {
 		.name = "m25p32-nonjedec",
 		.size = SZ_4M,
 	}, {
 		.name = "m25p64-nonjedec",
 		.size = SZ_8M,
 	}, {
 		.name = "m25p128-nonjedec",
 		.sector_size = SZ_256K,
 		.size = SZ_16M,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x10),
 		.name = "m25p05",
 		.sector_size = SZ_32K,
 		.size = SZ_64K,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x11),
 		.name = "m25p10",
 		.sector_size = SZ_32K,
 		.size = SZ_128K,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x12),
 		.name = "m25p20",
 		.size = SZ_256K,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x13),
 		.name = "m25p40",
 		.size = SZ_512K,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x14),
 		.name = "m25p80",
 		.size = SZ_1M,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x15),
 		.name = "m25p16",
 		.size = SZ_2M,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x16),
 		.name = "m25p32",
 		.size = SZ_4M,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x17),
 		.name = "m25p64",
 		.size = SZ_8M,
 	}, {
 		.id = SNOR_ID(0x20, 0x20, 0x18),
 		.name = "m25p128",
 		.sector_size = SZ_256K,
 		.size = SZ_16M,
 	}, {
 		.id = SNOR_ID(0x20, 0x40, 0x11),
 		.name = "m45pe10",
 		.size = SZ_128K,
 	}, {
 		.id = SNOR_ID(0x20, 0x40, 0x14),
 		.name = "m45pe80",
 		.size = SZ_1M,
 	}, {
 		.id = SNOR_ID(0x20, 0x40, 0x15),
 		.name = "m45pe16",
 		.size = SZ_2M,
 	}, {
 		.id = SNOR_ID(0x20, 0x63, 0x16),
 		.name = "m25px32-s1",
 		.size = SZ_4M,
 		.no_sfdp_flags = SECT_4K,
 	}, {
 		.id = SNOR_ID(0x20, 0x71, 0x14),
 		.name = "m25px80",
 		.size = SZ_1M,
 	}, {
 		.id = SNOR_ID(0x20, 0x71, 0x15),
 		.name = "m25px16",
 		.size = SZ_2M,
 		.no_sfdp_flags = SECT_4K,
 	}, {
 		.id = SNOR_ID(0x20, 0x71, 0x16),
 		.name = "m25px32",
 		.size = SZ_4M,
 		.no_sfdp_flags = SECT_4K,
 	}, {
 		.id = SNOR_ID(0x20, 0x71, 0x17),
 		.name = "m25px64",
 		.size = SZ_8M,
 	}, {
 		.id = SNOR_ID(0x20, 0x73, 0x16),
 		.name = "m25px32-s0",
 		.size = SZ_4M,
 		.no_sfdp_flags = SECT_4K,
 	}, {
 		.id = SNOR_ID(0x20, 0x80, 0x12),
 		.name = "m25pe20",
 		.size = SZ_256K,
 	}, {
 		.id = SNOR_ID(0x20, 0x80, 0x14),
 		.name = "m25pe80",
 		.size = SZ_1M,
 	}, {
 		.id = SNOR_ID(0x20, 0x80, 0x15),
 		.name = "m25pe16",
 		.size = SZ_2M,
 		.no_sfdp_flags = SECT_4K,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x16),
 		.name = "n25q032",
 		.size = SZ_4M,
 		.no_sfdp_flags = SPI_NOR_QUAD_READ,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x17),
 		.name = "n25q064",
 		.size = SZ_8M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x18),
 		.name = "n25q128a13",
 		.size = SZ_16M,
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x19, 0x10, 0x44, 0x00),
 		.name = "mt25ql256a",
 		.size = SZ_32M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
 		.fixup_flags = SPI_NOR_4B_OPCODES,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x19),
 		.name = "n25q256a",
 		.size = SZ_32M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x20, 0x10, 0x44, 0x00),
 		.name = "mt25ql512a",
 		.size = SZ_64M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
 		.fixup_flags = SPI_NOR_4B_OPCODES,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x20),
 		.name = "n25q512ax3",
 		.size = SZ_64M,
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x21),
 		.name = "n25q00",
 		.size = SZ_128M,
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 		.fixups = &n25q00_fixups,
 	}, {
 		.id = SNOR_ID(0x20, 0xba, 0x22),
 		.name = "mt25ql02g",
 		.size = SZ_256M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 		.fixups = &mt25q02_fixups,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x15),
 		.name = "n25q016a",
 		.size = SZ_2M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x16),
 		.name = "n25q032a",
 		.size = SZ_4M,
 		.no_sfdp_flags = SPI_NOR_QUAD_READ,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x17),
 		.name = "n25q064a",
 		.size = SZ_8M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x18),
 		.name = "n25q128a11",
 		.size = SZ_16M,
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x19, 0x10, 0x44, 0x00),
 		.name = "mt25qu256a",
 		.size = SZ_32M,
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
 		.fixup_flags = SPI_NOR_4B_OPCODES,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x19),
 		.name = "n25q256ax1",
 		.size = SZ_32M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x20, 0x10, 0x44, 0x00),
 		.name = "mt25qu512a",
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.mfr_flags = USE_FSR,
 		.fixups = &mt25qu512a_fixups,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x20),
 		.name = "n25q512a",
 		.size = SZ_64M,
 		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x21, 0x10, 0x44, 0x00),
 		.name = "mt25qu01g",
 		.mfr_flags = USE_FSR,
 		.fixups = &mt25q01_fixups,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x21),
 		.name = "n25q00a",
 		.size = SZ_128M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 		.fixups = &n25q00_fixups,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x22),
 		.name = "mt25qu02g",
 		.size = SZ_256M,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
 		.fixups = &mt25q02_fixups,
 	}
 };

 /**
  * micron_st_nor_read_fsr() - Read the Flag Status Register.
  * @nor:	pointer to 'struct spi_nor'
  * @fsr:	pointer to a DMA-able buffer where the value of the
  *              Flag Status Register will be written. Should be at least 2
  *              bytes.
  *
  * Return: 0 on success, -errno otherwise.
  */
 static int micron_st_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 {
 	int ret;

 	if (nor->spimem) {
 		struct spi_mem_op op = MICRON_ST_RDFSR_OP(fsr);

 		if (nor->reg_proto == SNOR_PROTO_8_8_8_DTR) {
 			op.addr.nbytes = nor->params->rdsr_addr_nbytes;
 			op.dummy.nbytes = nor->params->rdsr_dummy;
 			/*
 			 * We don't want to read only one byte in DTR mode. So,
 			 * read 2 and then discard the second byte.
 			 */
 			op.data.nbytes = 2;
 		}

 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);

 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
 		ret = spi_nor_controller_ops_read_reg(nor, SPINOR_OP_RDFSR, fsr,
 						      1);
 	}

 	if (ret)
 		dev_dbg(nor->dev, "error %d reading FSR\n", ret);

 	return ret;
 }

 /**
  * micron_st_nor_clear_fsr() - Clear the Flag Status Register.
  * @nor:	pointer to 'struct spi_nor'.
  */
 static void micron_st_nor_clear_fsr(struct spi_nor *nor)
 {
 	int ret;

 	if (nor->spimem) {
 		struct spi_mem_op op = MICRON_ST_CLFSR_OP;

 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);

 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
 		ret = spi_nor_controller_ops_write_reg(nor, SPINOR_OP_CLFSR,
 						       NULL, 0);
 	}

 	if (ret)
 		dev_dbg(nor->dev, "error %d clearing FSR\n", ret);
 }

 /**
  * micron_st_nor_ready() - Query the Status Register as well as the Flag Status
  * Register to see if the flash is ready for new commands. If there are any
  * errors in the FSR clear them.
  * @nor:	pointer to 'struct spi_nor'.
  *
  * Return: 1 if ready, 0 if not ready, -errno on errors.
  */
 static int micron_st_nor_ready(struct spi_nor *nor)
 {
 	int sr_ready, ret;

 	sr_ready = spi_nor_sr_ready(nor);
 	if (sr_ready < 0)
 		return sr_ready;

 	ret = micron_st_nor_read_fsr(nor, nor->bouncebuf);
 	if (ret) {
 		/*
 		 * Some controllers, such as Intel SPI, do not support low
 		 * level operations such as reading the flag status
 		 * register. They only expose small amount of high level
 		 * operations to the software. If this is the case we use
 		 * only the status register value.
 		 */
 		return ret == -EOPNOTSUPP ? sr_ready : ret;
 	}

 	if (nor->bouncebuf[0] & (FSR_E_ERR | FSR_P_ERR)) {
 		if (nor->bouncebuf[0] & FSR_E_ERR)
 			dev_err(nor->dev, "Erase operation failed.\n");
 		else
 			dev_err(nor->dev, "Program operation failed.\n");

 		if (nor->bouncebuf[0] & FSR_PT_ERR)
 			dev_err(nor->dev,
 				"Attempted to modify a protected sector.\n");

 		micron_st_nor_clear_fsr(nor);

 		/*
 		 * WEL bit remains set to one when an erase or page program
 		 * error occurs. Issue a Write Disable command to protect
 		 * against inadvertent writes that can possibly corrupt the
 		 * contents of the memory.
 		 */
 		ret = spi_nor_write_disable(nor);
 		if (ret)
 			return ret;

 		return -EIO;
 	}

 	return sr_ready && !!(nor->bouncebuf[0] & FSR_READY);
 }

 static void micron_st_nor_default_init(struct spi_nor *nor)
 {
 	nor->flags |= SNOR_F_HAS_LOCK;
 	nor->flags &= ~SNOR_F_HAS_16BIT_SR;
 	nor->params->quad_enable = NULL;
 }

 static int micron_st_nor_late_init(struct spi_nor *nor)
 {
 	struct spi_nor_flash_parameter *params = nor->params;

 	if (nor->info->mfr_flags & USE_FSR)
 		params->ready = micron_st_nor_ready;

 	if (!params->set_4byte_addr_mode)
 		params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_wren_en4b_ex4b;

 	return 0;
 }

 static const struct spi_nor_fixups micron_st_nor_fixups = {
 	.default_init = micron_st_nor_default_init,
 	.late_init = micron_st_nor_late_init,
 };

 const struct spi_nor_manufacturer spi_nor_micron = {
 	.name = "micron",
 	.parts = micron_nor_parts,
 	.nparts = ARRAY_SIZE(micron_nor_parts),
 	.fixups = &micron_st_nor_fixups,
 };

 const struct spi_nor_manufacturer spi_nor_st = {
 	.name = "st",
 	.parts = st_nor_parts,
 	.nparts = ARRAY_SIZE(st_nor_parts),
 	.fixups = &micron_st_nor_fixups,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2005, Intec Automation Inc.
	* Copyright (C) 2014, Freescale Semiconductor, Inc.
	*/

	#include <linux/mtd/spi-nor.h>

	#include "core.h"

	/* flash_info mfr_flag. Used to read proprietary FSR register. */
	#define USE_FSR BIT(0)

	#define SPINOR_OP_MT_DIE_ERASE 0xc4 /* Chip (die) erase opcode */
	#define SPINOR_OP_RDFSR 0x70 /* Read flag status register */
	#define SPINOR_OP_CLFSR 0x50 /* Clear flag status 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_REG_MT_CFR1V_DEF 0x1f /* Default dummy cycles */
	#define SPINOR_MT_OCT_DTR 0xe7 /* Enable Octal DTR. */
	#define SPINOR_MT_EXSPI 0xff /* Enable Extended SPI (default) */

	/* 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 */

	/* Micron ST SPI NOR flash operations. */
	#define MICRON_ST_NOR_WR_ANY_REG_OP(naddr, addr, ndata, buf) \
	SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 0), \
	SPI_MEM_OP_ADDR(naddr, addr, 0), \
	SPI_MEM_OP_NO_DUMMY, \
	SPI_MEM_OP_DATA_OUT(ndata, buf, 0))

	#define MICRON_ST_RDFSR_OP(buf) \
	SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDFSR, 0), \
	SPI_MEM_OP_NO_ADDR, \
	SPI_MEM_OP_NO_DUMMY, \
	SPI_MEM_OP_DATA_IN(1, buf, 0))

	#define MICRON_ST_CLFSR_OP \
	SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_CLFSR, 0), \
	SPI_MEM_OP_NO_ADDR, \
	SPI_MEM_OP_NO_DUMMY, \
	SPI_MEM_OP_NO_DATA)

	static int micron_st_nor_octal_dtr_en(struct spi_nor *nor)
	{
	struct spi_mem_op op;
	u8 *buf = nor->bouncebuf;
	int ret;
	u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;

	/* Use 20 dummy cycles for memory array reads. */
	*buf = 20;
	op = (struct spi_mem_op)
	MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
	SPINOR_REG_MT_CFR1V, 1, buf);
	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
	if (ret)
	return ret;

	buf[0] = SPINOR_MT_OCT_DTR;
	op = (struct spi_mem_op)
	MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
	SPINOR_REG_MT_CFR0V, 1, buf);
	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
	if (ret)
	return ret;

	/* Read flash ID to make sure the switch was successful. */
	ret = spi_nor_read_id(nor, 0, 8, buf, SNOR_PROTO_8_8_8_DTR);
	if (ret) {
	dev_dbg(nor->dev, "error %d reading JEDEC ID after enabling 8D-8D-8D mode\n", ret);
	return ret;
	}

	if (memcmp(buf, nor->info->id->bytes, nor->info->id->len))
	return -EINVAL;

	return 0;
	}

	static int micron_st_nor_octal_dtr_dis(struct spi_nor *nor)
	{
	struct spi_mem_op op;
	u8 *buf = nor->bouncebuf;
	int ret;

	/*
	* The register is 1-byte wide, but 1-byte transactions are not allowed
	* in 8D-8D-8D mode. The next register is the dummy cycle configuration
	* register. Since the transaction needs to be at least 2 bytes wide,
	* set the next register to its default value. This also makes sense
	* because the value was changed when enabling 8D-8D-8D mode, it should
	* be reset when disabling.
	*/
	buf[0] = SPINOR_MT_EXSPI;
	buf[1] = SPINOR_REG_MT_CFR1V_DEF;
	op = (struct spi_mem_op)
	MICRON_ST_NOR_WR_ANY_REG_OP(nor->addr_nbytes,
	SPINOR_REG_MT_CFR0V, 2, buf);
	ret = spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
	if (ret)
	return ret;

	/* Read flash ID to make sure the switch was successful. */
	ret = spi_nor_read_id(nor, 0, 0, buf, SNOR_PROTO_1_1_1);
	if (ret) {
	dev_dbg(nor->dev, "error %d reading JEDEC ID after disabling 8D-8D-8D mode\n", ret);
	return ret;
	}

	if (memcmp(buf, nor->info->id->bytes, nor->info->id->len))
	return -EINVAL;

	return 0;
	}

	static int micron_st_nor_set_octal_dtr(struct spi_nor *nor, bool enable)
	{
	return enable ? micron_st_nor_octal_dtr_en(nor) :
	micron_st_nor_octal_dtr_dis(nor);
	}

	static void mt35xu512aba_default_init(struct spi_nor *nor)
	{
	nor->params->set_octal_dtr = micron_st_nor_set_octal_dtr;
	}

	static int mt35xu512aba_post_sfdp_fixup(struct spi_nor *nor)
	{
	/* Set the Fast Read settings. */
	nor->params->hwcaps.mask \|= SNOR_HWCAPS_READ_8_8_8_DTR;
	spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_8_8_8_DTR],
	0, 20, SPINOR_OP_MT_DTR_RD,
	SNOR_PROTO_8_8_8_DTR);

	nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
	nor->params->rdsr_dummy = 8;
	nor->params->rdsr_addr_nbytes = 0;

	/*
	* The BFPT quad enable field is set to a reserved value so the quad
	* enable function is ignored by spi_nor_parse_bfpt(). Make sure we
	* disable it.
	*/
	nor->params->quad_enable = NULL;

	return 0;
	}

	static const struct spi_nor_fixups mt35xu512aba_fixups = {
	.default_init = mt35xu512aba_default_init,
	.post_sfdp = mt35xu512aba_post_sfdp_fixup,
	};

	static const struct flash_info micron_nor_parts[] = {
	{
	.id = SNOR_ID(0x2c, 0x5b, 0x1a),
	.name = "mt35xu512aba",
	.sector_size = SZ_128K,
	.size = SZ_64M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_OCTAL_READ \|
	SPI_NOR_OCTAL_DTR_READ \| SPI_NOR_OCTAL_DTR_PP,
	.mfr_flags = USE_FSR,
	.fixup_flags = SPI_NOR_4B_OPCODES \| SPI_NOR_IO_MODE_EN_VOLATILE,
	.fixups = &mt35xu512aba_fixups,
	}, {
	.id = SNOR_ID(0x2c, 0x5b, 0x1c),
	.name = "mt35xu02g",
	.sector_size = SZ_128K,
	.size = SZ_256M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_OCTAL_READ,
	.mfr_flags = USE_FSR,
	.fixup_flags = SPI_NOR_4B_OPCODES,
	},
	};

	static int mt25qu512a_post_bfpt_fixup(struct spi_nor *nor,
	const struct sfdp_parameter_header *bfpt_header,
	const struct sfdp_bfpt *bfpt)
	{
	nor->flags &= ~SNOR_F_HAS_16BIT_SR;
	return 0;
	}

	static struct spi_nor_fixups mt25qu512a_fixups = {
	.post_bfpt = mt25qu512a_post_bfpt_fixup,
	};

	static int st_nor_four_die_late_init(struct spi_nor *nor)
	{
	struct spi_nor_flash_parameter *params = nor->params;

	params->die_erase_opcode = SPINOR_OP_MT_DIE_ERASE;
	params->n_dice = 4;

	/*
	* Unfortunately the die erase opcode does not have a 4-byte opcode
	* correspondent for these flashes. The SFDP 4BAIT table fails to
	* consider the die erase too. We're forced to enter in the 4 byte
	* address mode in order to benefit of the die erase.
	*/
	return spi_nor_set_4byte_addr_mode(nor, true);
	}

	static int st_nor_two_die_late_init(struct spi_nor *nor)
	{
	struct spi_nor_flash_parameter *params = nor->params;

	params->die_erase_opcode = SPINOR_OP_MT_DIE_ERASE;
	params->n_dice = 2;

	/*
	* Unfortunately the die erase opcode does not have a 4-byte opcode
	* correspondent for these flashes. The SFDP 4BAIT table fails to
	* consider the die erase too. We're forced to enter in the 4 byte
	* address mode in order to benefit of the die erase.
	*/
	return spi_nor_set_4byte_addr_mode(nor, true);
	}

	static struct spi_nor_fixups n25q00_fixups = {
	.late_init = st_nor_four_die_late_init,
	};

	static struct spi_nor_fixups mt25q01_fixups = {
	.late_init = st_nor_two_die_late_init,
	};

	static struct spi_nor_fixups mt25q02_fixups = {
	.late_init = st_nor_four_die_late_init,
	};

	static const struct flash_info st_nor_parts[] = {
	{
	.name = "m25p05-nonjedec",
	.sector_size = SZ_32K,
	.size = SZ_64K,
	}, {
	.name = "m25p10-nonjedec",
	.sector_size = SZ_32K,
	.size = SZ_128K,
	}, {
	.name = "m25p20-nonjedec",
	.size = SZ_256K,
	}, {
	.name = "m25p40-nonjedec",
	.size = SZ_512K,
	}, {
	.name = "m25p80-nonjedec",
	.size = SZ_1M,
	}, {
	.name = "m25p16-nonjedec",
	.size = SZ_2M,
	}, {
	.name = "m25p32-nonjedec",
	.size = SZ_4M,
	}, {
	.name = "m25p64-nonjedec",
	.size = SZ_8M,
	}, {
	.name = "m25p128-nonjedec",
	.sector_size = SZ_256K,
	.size = SZ_16M,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x10),
	.name = "m25p05",
	.sector_size = SZ_32K,
	.size = SZ_64K,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x11),
	.name = "m25p10",
	.sector_size = SZ_32K,
	.size = SZ_128K,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x12),
	.name = "m25p20",
	.size = SZ_256K,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x13),
	.name = "m25p40",
	.size = SZ_512K,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x14),
	.name = "m25p80",
	.size = SZ_1M,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x15),
	.name = "m25p16",
	.size = SZ_2M,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x16),
	.name = "m25p32",
	.size = SZ_4M,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x17),
	.name = "m25p64",
	.size = SZ_8M,
	}, {
	.id = SNOR_ID(0x20, 0x20, 0x18),
	.name = "m25p128",
	.sector_size = SZ_256K,
	.size = SZ_16M,
	}, {
	.id = SNOR_ID(0x20, 0x40, 0x11),
	.name = "m45pe10",
	.size = SZ_128K,
	}, {
	.id = SNOR_ID(0x20, 0x40, 0x14),
	.name = "m45pe80",
	.size = SZ_1M,
	}, {
	.id = SNOR_ID(0x20, 0x40, 0x15),
	.name = "m45pe16",
	.size = SZ_2M,
	}, {
	.id = SNOR_ID(0x20, 0x63, 0x16),
	.name = "m25px32-s1",
	.size = SZ_4M,
	.no_sfdp_flags = SECT_4K,
	}, {
	.id = SNOR_ID(0x20, 0x71, 0x14),
	.name = "m25px80",
	.size = SZ_1M,
	}, {
	.id = SNOR_ID(0x20, 0x71, 0x15),
	.name = "m25px16",
	.size = SZ_2M,
	.no_sfdp_flags = SECT_4K,
	}, {
	.id = SNOR_ID(0x20, 0x71, 0x16),
	.name = "m25px32",
	.size = SZ_4M,
	.no_sfdp_flags = SECT_4K,
	}, {
	.id = SNOR_ID(0x20, 0x71, 0x17),
	.name = "m25px64",
	.size = SZ_8M,
	}, {
	.id = SNOR_ID(0x20, 0x73, 0x16),
	.name = "m25px32-s0",
	.size = SZ_4M,
	.no_sfdp_flags = SECT_4K,
	}, {
	.id = SNOR_ID(0x20, 0x80, 0x12),
	.name = "m25pe20",
	.size = SZ_256K,
	}, {
	.id = SNOR_ID(0x20, 0x80, 0x14),
	.name = "m25pe80",
	.size = SZ_1M,
	}, {
	.id = SNOR_ID(0x20, 0x80, 0x15),
	.name = "m25pe16",
	.size = SZ_2M,
	.no_sfdp_flags = SECT_4K,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x16),
	.name = "n25q032",
	.size = SZ_4M,
	.no_sfdp_flags = SPI_NOR_QUAD_READ,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x17),
	.name = "n25q064",
	.size = SZ_8M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x18),
	.name = "n25q128a13",
	.size = SZ_16M,
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x19, 0x10, 0x44, 0x00),
	.name = "mt25ql256a",
	.size = SZ_32M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_DUAL_READ \| SPI_NOR_QUAD_READ,
	.fixup_flags = SPI_NOR_4B_OPCODES,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x19),
	.name = "n25q256a",
	.size = SZ_32M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_DUAL_READ \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x20, 0x10, 0x44, 0x00),
	.name = "mt25ql512a",
	.size = SZ_64M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_DUAL_READ \| SPI_NOR_QUAD_READ,
	.fixup_flags = SPI_NOR_4B_OPCODES,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x20),
	.name = "n25q512ax3",
	.size = SZ_64M,
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x21),
	.name = "n25q00",
	.size = SZ_128M,
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	.fixups = &n25q00_fixups,
	}, {
	.id = SNOR_ID(0x20, 0xba, 0x22),
	.name = "mt25ql02g",
	.size = SZ_256M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	.fixups = &mt25q02_fixups,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x15),
	.name = "n25q016a",
	.size = SZ_2M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x16),
	.name = "n25q032a",
	.size = SZ_4M,
	.no_sfdp_flags = SPI_NOR_QUAD_READ,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x17),
	.name = "n25q064a",
	.size = SZ_8M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x18),
	.name = "n25q128a11",
	.size = SZ_16M,
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x19, 0x10, 0x44, 0x00),
	.name = "mt25qu256a",
	.size = SZ_32M,
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_DUAL_READ \| SPI_NOR_QUAD_READ,
	.fixup_flags = SPI_NOR_4B_OPCODES,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x19),
	.name = "n25q256ax1",
	.size = SZ_32M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x20, 0x10, 0x44, 0x00),
	.name = "mt25qu512a",
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.mfr_flags = USE_FSR,
	.fixups = &mt25qu512a_fixups,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x20),
	.name = "n25q512a",
	.size = SZ_64M,
	.flags = SPI_NOR_HAS_LOCK \| SPI_NOR_HAS_TB \| SPI_NOR_4BIT_BP \|
	SPI_NOR_BP3_SR_BIT6,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x21, 0x10, 0x44, 0x00),
	.name = "mt25qu01g",
	.mfr_flags = USE_FSR,
	.fixups = &mt25q01_fixups,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x21),
	.name = "n25q00a",
	.size = SZ_128M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	.fixups = &n25q00_fixups,
	}, {
	.id = SNOR_ID(0x20, 0xbb, 0x22),
	.name = "mt25qu02g",
	.size = SZ_256M,
	.no_sfdp_flags = SECT_4K \| SPI_NOR_DUAL_READ \| SPI_NOR_QUAD_READ,
	.mfr_flags = USE_FSR,
	.fixups = &mt25q02_fixups,
	}
	};

	/**
	* micron_st_nor_read_fsr() - Read the Flag Status Register.
	* @nor: pointer to 'struct spi_nor'
	* @fsr: pointer to a DMA-able buffer where the value of the
	* Flag Status Register will be written. Should be at least 2
	* bytes.
	*
	* Return: 0 on success, -errno otherwise.
	*/
	static int micron_st_nor_read_fsr(struct spi_nor nor, u8 fsr)
	{
	int ret;

	if (nor->spimem) {
	struct spi_mem_op op = MICRON_ST_RDFSR_OP(fsr);

	if (nor->reg_proto == SNOR_PROTO_8_8_8_DTR) {
	op.addr.nbytes = nor->params->rdsr_addr_nbytes;
	op.dummy.nbytes = nor->params->rdsr_dummy;
	/*
	* We don't want to read only one byte in DTR mode. So,
	* read 2 and then discard the second byte.
	*/
	op.data.nbytes = 2;
	}

	spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);

	ret = spi_mem_exec_op(nor->spimem, &op);
	} else {
	ret = spi_nor_controller_ops_read_reg(nor, SPINOR_OP_RDFSR, fsr,
	1);
	}

	if (ret)
	dev_dbg(nor->dev, "error %d reading FSR\n", ret);

	return ret;
	}

	/**
	* micron_st_nor_clear_fsr() - Clear the Flag Status Register.
	* @nor: pointer to 'struct spi_nor'.
	*/
	static void micron_st_nor_clear_fsr(struct spi_nor *nor)
	{
	int ret;

	if (nor->spimem) {
	struct spi_mem_op op = MICRON_ST_CLFSR_OP;

	spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);

	ret = spi_mem_exec_op(nor->spimem, &op);
	} else {
	ret = spi_nor_controller_ops_write_reg(nor, SPINOR_OP_CLFSR,
	NULL, 0);
	}

	if (ret)
	dev_dbg(nor->dev, "error %d clearing FSR\n", ret);
	}

	/**
	* micron_st_nor_ready() - Query the Status Register as well as the Flag Status
	* Register to see if the flash is ready for new commands. If there are any
	* errors in the FSR clear them.
	* @nor: pointer to 'struct spi_nor'.
	*
	* Return: 1 if ready, 0 if not ready, -errno on errors.
	*/
	static int micron_st_nor_ready(struct spi_nor *nor)
	{
	int sr_ready, ret;

	sr_ready = spi_nor_sr_ready(nor);
	if (sr_ready < 0)
	return sr_ready;

	ret = micron_st_nor_read_fsr(nor, nor->bouncebuf);
	if (ret) {
	/*
	* Some controllers, such as Intel SPI, do not support low
	* level operations such as reading the flag status
	* register. They only expose small amount of high level
	* operations to the software. If this is the case we use
	* only the status register value.
	*/
	return ret == -EOPNOTSUPP ? sr_ready : ret;
	}

	if (nor->bouncebuf[0] & (FSR_E_ERR \| FSR_P_ERR)) {
	if (nor->bouncebuf[0] & FSR_E_ERR)
	dev_err(nor->dev, "Erase operation failed.\n");
	else
	dev_err(nor->dev, "Program operation failed.\n");

	if (nor->bouncebuf[0] & FSR_PT_ERR)
	dev_err(nor->dev,
	"Attempted to modify a protected sector.\n");

	micron_st_nor_clear_fsr(nor);

	/*
	* WEL bit remains set to one when an erase or page program
	* error occurs. Issue a Write Disable command to protect
	* against inadvertent writes that can possibly corrupt the
	* contents of the memory.
	*/
	ret = spi_nor_write_disable(nor);
	if (ret)
	return ret;

	return -EIO;
	}

	return sr_ready && !!(nor->bouncebuf[0] & FSR_READY);
	}

	static void micron_st_nor_default_init(struct spi_nor *nor)
	{
	nor->flags \|= SNOR_F_HAS_LOCK;
	nor->flags &= ~SNOR_F_HAS_16BIT_SR;
	nor->params->quad_enable = NULL;
	}

	static int micron_st_nor_late_init(struct spi_nor *nor)
	{
	struct spi_nor_flash_parameter *params = nor->params;

	if (nor->info->mfr_flags & USE_FSR)
	params->ready = micron_st_nor_ready;

	if (!params->set_4byte_addr_mode)
	params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_wren_en4b_ex4b;

	return 0;
	}

	static const struct spi_nor_fixups micron_st_nor_fixups = {
	.default_init = micron_st_nor_default_init,
	.late_init = micron_st_nor_late_init,
	};

	const struct spi_nor_manufacturer spi_nor_micron = {
	.name = "micron",
	.parts = micron_nor_parts,
	.nparts = ARRAY_SIZE(micron_nor_parts),
	.fixups = &micron_st_nor_fixups,
	};

	const struct spi_nor_manufacturer spi_nor_st = {
	.name = "st",
	.parts = st_nor_parts,
	.nparts = ARRAY_SIZE(st_nor_parts),
	.fixups = &micron_st_nor_fixups,
	};