openwrt/package/boot/uboot-mediatek/patches/100-02-drivers-mtd-add-support-for-MediaTek-SPI-NAND-flash-.patch

From f7704275957852cd4c4632d6da126979ef24b83a Mon Sep 17 00:00:00 2001
From: Weijie Gao <[email protected]>
Date: Tue, 2 Mar 2021 16:58:01 +0800
Subject: [PATCH 36/71] drivers: mtd: add support for MediaTek SPI-NAND flash
 controller

Add mtd driver for MediaTek SPI-NAND flash controller

This driver is written from scratch, and uses standard mtd framework, not
the nand framework which only applies for raw parallel nand flashes so that
this driver can have a smaller size in binary.

Signed-off-by: Weijie Gao <[email protected]>
---
 drivers/mtd/Kconfig                   |    2 +
 drivers/mtd/Makefile                  |    2 +
 drivers/mtd/mtk-snand/Kconfig         |   21 +
 drivers/mtd/mtk-snand/Makefile        |   11 +
 drivers/mtd/mtk-snand/mtk-snand-def.h |  271 ++++
 drivers/mtd/mtk-snand/mtk-snand-ecc.c |  411 ++++++
 drivers/mtd/mtk-snand/mtk-snand-ids.c |  515 +++++++
 drivers/mtd/mtk-snand/mtk-snand-mtd.c |  535 +++++++
 drivers/mtd/mtk-snand/mtk-snand-os.c  |   39 +
 drivers/mtd/mtk-snand/mtk-snand-os.h  |  120 ++
 drivers/mtd/mtk-snand/mtk-snand.c     | 1933 +++++++++++++++++++++++++
 drivers/mtd/mtk-snand/mtk-snand.h     |   77 +
 12 files changed, 3937 insertions(+)
 create mode 100644 drivers/mtd/mtk-snand/Kconfig
 create mode 100644 drivers/mtd/mtk-snand/Makefile
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand-def.h
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand-ecc.c
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand-ids.c
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand-mtd.c
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand-os.c
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand-os.h
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand.c
 create mode 100644 drivers/mtd/mtk-snand/mtk-snand.h

--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -238,6 +238,8 @@ config SYS_MAX_FLASH_BANKS_DETECT
 	 to reduce the effective number of flash bank, between 0 and
 	 CONFIG_SYS_MAX_FLASH_BANKS
 
+source "drivers/mtd/mtk-snand/Kconfig"
+
 source "drivers/mtd/nand/Kconfig"
 
 config SYS_NAND_MAX_OOBFREE
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -39,3 +39,5 @@ obj-$(CONFIG_$(SPL_TPL_)SPI_FLASH_SUPPOR
 obj-$(CONFIG_SPL_UBI) += ubispl/
 
 endif
+
+obj-$(CONFIG_MTK_SPI_NAND) += mtk-snand/
--- /dev/null
+++ b/drivers/mtd/mtk-snand/Kconfig
@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2020 MediaTek Inc. All rights reserved.
+# Author: Weijie Gao <[email protected]>
+#
+# SPDX-License-Identifier: GPL-2.0
+#
+
+config MTK_SPI_NAND
+	tristate "MediaTek SPI NAND flash controller driver"
+	depends on !MTD_SPI_NAND
+	help
+	  This option enables access to SPI-NAND flashes through the
+	  MediaTek SPI NAND Flash Controller
+
+config MTK_SPI_NAND_MTD
+	tristate "MTD support for MediaTek SPI NAND flash controller"
+	depends on DM_MTD
+	depends on MTK_SPI_NAND
+	help
+	  This option enables access to SPI-NAND flashes through the
+	  MTD interface of MediaTek SPI NAND Flash Controller
--- /dev/null
+++ b/drivers/mtd/mtk-snand/Makefile
@@ -0,0 +1,11 @@
+#
+# Copyright (C) 2020 MediaTek Inc. All rights reserved.
+# Author: Weijie Gao <[email protected]>
+#
+# SPDX-License-Identifier: GPL-2.0
+#
+
+obj-y += mtk-snand.o mtk-snand-ecc.o mtk-snand-ids.o mtk-snand-os.o
+obj-$(CONFIG_MTK_SPI_NAND_MTD) += mtk-snand-mtd.o
+
+ccflags-y += -DPRIVATE_MTK_SNAND_HEADER
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand-def.h
@@ -0,0 +1,271 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef _MTK_SNAND_DEF_H_
+#define _MTK_SNAND_DEF_H_
+
+#include "mtk-snand-os.h"
+
+#ifdef PRIVATE_MTK_SNAND_HEADER
+#include "mtk-snand.h"
+#else
+#include <mtk-snand.h>
+#endif
+
+struct mtk_snand_plat_dev;
+
+enum snand_flash_io {
+	SNAND_IO_1_1_1,
+	SNAND_IO_1_1_2,
+	SNAND_IO_1_2_2,
+	SNAND_IO_1_1_4,
+	SNAND_IO_1_4_4,
+
+	__SNAND_IO_MAX
+};
+
+#define SPI_IO_1_1_1			BIT(SNAND_IO_1_1_1)
+#define SPI_IO_1_1_2			BIT(SNAND_IO_1_1_2)
+#define SPI_IO_1_2_2			BIT(SNAND_IO_1_2_2)
+#define SPI_IO_1_1_4			BIT(SNAND_IO_1_1_4)
+#define SPI_IO_1_4_4			BIT(SNAND_IO_1_4_4)
+
+struct snand_opcode {
+	uint8_t opcode;
+	uint8_t dummy;
+};
+
+struct snand_io_cap {
+	uint8_t caps;
+	struct snand_opcode opcodes[__SNAND_IO_MAX];
+};
+
+#define SNAND_OP(_io, _opcode, _dummy) [_io] = { .opcode = (_opcode), \
+						 .dummy = (_dummy) }
+
+#define SNAND_IO_CAP(_name, _caps, ...) \
+	struct snand_io_cap _name = { .caps = (_caps), \
+				      .opcodes = { __VA_ARGS__ } }
+
+#define SNAND_MAX_ID_LEN		4
+
+enum snand_id_type {
+	SNAND_ID_DYMMY,
+	SNAND_ID_ADDR = SNAND_ID_DYMMY,
+	SNAND_ID_DIRECT,
+
+	__SNAND_ID_TYPE_MAX
+};
+
+struct snand_id {
+	uint8_t type;	/* enum snand_id_type */
+	uint8_t len;
+	uint8_t id[SNAND_MAX_ID_LEN];
+};
+
+#define SNAND_ID(_type, ...) \
+	{ .type = (_type), .id = { __VA_ARGS__ }, \
+	  .len = sizeof((uint8_t[]) { __VA_ARGS__ }) }
+
+struct snand_mem_org {
+	uint16_t pagesize;
+	uint16_t sparesize;
+	uint16_t pages_per_block;
+	uint16_t blocks_per_die;
+	uint16_t planes_per_die;
+	uint16_t ndies;
+};
+
+#define SNAND_MEMORG(_ps, _ss, _ppb, _bpd, _ppd, _nd) \
+	{ .pagesize = (_ps), .sparesize = (_ss), .pages_per_block = (_ppb), \
+	  .blocks_per_die = (_bpd), .planes_per_die = (_ppd), .ndies = (_nd) }
+
+typedef int (*snand_select_die_t)(struct mtk_snand *snf, uint32_t dieidx);
+
+struct snand_flash_info {
+	const char *model;
+	struct snand_id id;
+	const struct snand_mem_org memorg;
+	const struct snand_io_cap *cap_rd;
+	const struct snand_io_cap *cap_pl;
+	snand_select_die_t select_die;
+};
+
+#define SNAND_INFO(_model, _id, _memorg, _cap_rd, _cap_pl, ...) \
+	{ .model = (_model), .id = _id, .memorg = _memorg, \
+	  .cap_rd = (_cap_rd), .cap_pl = (_cap_pl), __VA_ARGS__ }
+
+const struct snand_flash_info *snand_flash_id_lookup(enum snand_id_type type,
+						     const uint8_t *id);
+
+struct mtk_snand_soc_data {
+	uint16_t sector_size;
+	uint16_t max_sectors;
+	uint16_t fdm_size;
+	uint16_t fdm_ecc_size;
+	uint16_t fifo_size;
+
+	bool bbm_swap;
+	bool empty_page_check;
+	uint32_t mastersta_mask;
+
+	const uint8_t *spare_sizes;
+	uint32_t num_spare_size;
+
+	uint16_t latch_lat;
+	uint16_t sample_delay;
+};
+
+enum mtk_ecc_regs {
+	ECC_DECDONE,
+};
+
+struct mtk_ecc_soc_data {
+	const uint8_t *ecc_caps;
+	uint32_t num_ecc_cap;
+	const uint32_t *regs;
+	uint16_t mode_shift;
+	uint8_t errnum_bits;
+	uint8_t errnum_shift;
+};
+
+struct mtk_snand {
+	struct mtk_snand_plat_dev *pdev;
+
+	void __iomem *nfi_base;
+	void __iomem *ecc_base;
+
+	enum mtk_snand_soc soc;
+	const struct mtk_snand_soc_data *nfi_soc;
+	const struct mtk_ecc_soc_data *ecc_soc;
+	bool snfi_quad_spi;
+	bool quad_spi_op;
+
+	const char *model;
+	uint64_t size;
+	uint64_t die_size;
+	uint32_t erasesize;
+	uint32_t writesize;
+	uint32_t oobsize;
+
+	uint32_t num_dies;
+	snand_select_die_t select_die;
+
+	uint8_t opcode_rfc;
+	uint8_t opcode_pl;
+	uint8_t dummy_rfc;
+	uint8_t mode_rfc;
+	uint8_t mode_pl;
+
+	uint32_t writesize_mask;
+	uint32_t writesize_shift;
+	uint32_t erasesize_mask;
+	uint32_t erasesize_shift;
+	uint64_t die_mask;
+	uint32_t die_shift;
+
+	uint32_t spare_per_sector;
+	uint32_t raw_sector_size;
+	uint32_t ecc_strength;
+	uint32_t ecc_steps;
+	uint32_t ecc_bytes;
+	uint32_t ecc_parity_bits;
+
+	uint8_t *page_cache;	/* Used by read/write page */
+	uint8_t *buf_cache;	/* Used by block bad/markbad & auto_oob */
+	int *sect_bf;		/* Used by ECC correction */
+};
+
+enum mtk_snand_log_category {
+	SNAND_LOG_NFI,
+	SNAND_LOG_SNFI,
+	SNAND_LOG_ECC,
+	SNAND_LOG_CHIP,
+
+	__SNAND_LOG_CAT_MAX
+};
+
+int mtk_ecc_setup(struct mtk_snand *snf, void *fmdaddr, uint32_t max_ecc_bytes,
+		  uint32_t msg_size);
+int mtk_snand_ecc_encoder_start(struct mtk_snand *snf);
+void mtk_snand_ecc_encoder_stop(struct mtk_snand *snf);
+int mtk_snand_ecc_decoder_start(struct mtk_snand *snf);
+void mtk_snand_ecc_decoder_stop(struct mtk_snand *snf);
+int mtk_ecc_wait_decoder_done(struct mtk_snand *snf);
+int mtk_ecc_check_decode_error(struct mtk_snand *snf);
+int mtk_ecc_fixup_empty_sector(struct mtk_snand *snf, uint32_t sect);
+
+int mtk_snand_mac_io(struct mtk_snand *snf, const uint8_t *out, uint32_t outlen,
+		     uint8_t *in, uint32_t inlen);
+int mtk_snand_set_feature(struct mtk_snand *snf, uint32_t addr, uint32_t val);
+
+int mtk_snand_log(struct mtk_snand_plat_dev *pdev,
+		  enum mtk_snand_log_category cat, const char *fmt, ...);
+
+#define snand_log_nfi(pdev, fmt, ...) \
+	mtk_snand_log(pdev, SNAND_LOG_NFI, fmt, ##__VA_ARGS__)
+
+#define snand_log_snfi(pdev, fmt, ...) \
+	mtk_snand_log(pdev, SNAND_LOG_SNFI, fmt, ##__VA_ARGS__)
+
+#define snand_log_ecc(pdev, fmt, ...) \
+	mtk_snand_log(pdev, SNAND_LOG_ECC, fmt, ##__VA_ARGS__)
+
+#define snand_log_chip(pdev, fmt, ...) \
+	mtk_snand_log(pdev, SNAND_LOG_CHIP, fmt, ##__VA_ARGS__)
+
+/* ffs64 */
+static inline int mtk_snand_ffs64(uint64_t x)
+{
+	if (!x)
+		return 0;
+
+	if (!(x & 0xffffffff))
+		return ffs((uint32_t)(x >> 32)) + 32;
+
+	return ffs((uint32_t)(x & 0xffffffff));
+}
+
+/* NFI dummy commands */
+#define NFI_CMD_DUMMY_READ		0x00
+#define NFI_CMD_DUMMY_WRITE		0x80
+
+/* SPI-NAND opcodes */
+#define SNAND_CMD_RESET			0xff
+#define SNAND_CMD_BLOCK_ERASE		0xd8
+#define SNAND_CMD_READ_FROM_CACHE_QUAD	0xeb
+#define SNAND_CMD_WINBOND_SELECT_DIE	0xc2
+#define SNAND_CMD_READ_FROM_CACHE_DUAL	0xbb
+#define SNAND_CMD_READID		0x9f
+#define SNAND_CMD_READ_FROM_CACHE_X4	0x6b
+#define SNAND_CMD_READ_FROM_CACHE_X2	0x3b
+#define SNAND_CMD_PROGRAM_LOAD_X4	0x32
+#define SNAND_CMD_SET_FEATURE		0x1f
+#define SNAND_CMD_READ_TO_CACHE		0x13
+#define SNAND_CMD_PROGRAM_EXECUTE	0x10
+#define SNAND_CMD_GET_FEATURE		0x0f
+#define SNAND_CMD_READ_FROM_CACHE	0x0b
+#define SNAND_CMD_WRITE_ENABLE		0x06
+#define SNAND_CMD_PROGRAM_LOAD		0x02
+
+/* SPI-NAND feature addresses */
+#define SNAND_FEATURE_MICRON_DIE_ADDR	0xd0
+#define SNAND_MICRON_DIE_SEL_1		BIT(6)
+
+#define SNAND_FEATURE_STATUS_ADDR	0xc0
+#define SNAND_STATUS_OIP		BIT(0)
+#define SNAND_STATUS_WEL		BIT(1)
+#define SNAND_STATUS_ERASE_FAIL		BIT(2)
+#define SNAND_STATUS_PROGRAM_FAIL	BIT(3)
+
+#define SNAND_FEATURE_CONFIG_ADDR	0xb0
+#define SNAND_FEATURE_QUAD_ENABLE	BIT(0)
+#define SNAND_FEATURE_ECC_EN		BIT(4)
+
+#define SNAND_FEATURE_PROTECT_ADDR	0xa0
+
+#endif /* _MTK_SNAND_DEF_H_ */
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand-ecc.c
@@ -0,0 +1,411 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include "mtk-snand-def.h"
+
+/* ECC registers */
+#define ECC_ENCCON			0x000
+#define ENC_EN				BIT(0)
+
+#define ECC_ENCCNFG			0x004
+#define ENC_MS_S			16
+#define ENC_BURST_EN			BIT(8)
+#define ENC_TNUM_S			0
+
+#define ECC_ENCIDLE			0x00c
+#define ENC_IDLE			BIT(0)
+
+#define ECC_DECCON			0x100
+#define DEC_EN				BIT(0)
+
+#define ECC_DECCNFG			0x104
+#define DEC_EMPTY_EN			BIT(31)
+#define DEC_CS_S			16
+#define DEC_CON_S			12
+#define   DEC_CON_CORRECT		3
+#define DEC_BURST_EN			BIT(8)
+#define DEC_TNUM_S			0
+
+#define ECC_DECIDLE			0x10c
+#define DEC_IDLE			BIT(0)
+
+#define ECC_DECENUM0			0x114
+#define ECC_DECENUM(n)			(ECC_DECENUM0 + (n) * 4)
+
+/* ECC_ENCIDLE & ECC_DECIDLE */
+#define ECC_IDLE			BIT(0)
+
+/* ENC_MODE & DEC_MODE */
+#define ECC_MODE_NFI			1
+
+#define ECC_TIMEOUT			500000
+
+static const uint8_t mt7622_ecc_caps[] = { 4, 6, 8, 10, 12 };
+
+static const uint8_t mt7981_ecc_caps[] = {
+	4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24
+};
+
+static const uint8_t mt7986_ecc_caps[] = {
+	4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24
+};
+
+static const uint32_t mt7622_ecc_regs[] = {
+	[ECC_DECDONE] = 0x11c,
+};
+
+static const uint32_t mt7981_ecc_regs[] = {
+	[ECC_DECDONE] = 0x124,
+};
+
+static const uint32_t mt7986_ecc_regs[] = {
+	[ECC_DECDONE] = 0x124,
+};
+
+static const struct mtk_ecc_soc_data mtk_ecc_socs[__SNAND_SOC_MAX] = {
+	[SNAND_SOC_MT7622] = {
+		.ecc_caps = mt7622_ecc_caps,
+		.num_ecc_cap = ARRAY_SIZE(mt7622_ecc_caps),
+		.regs = mt7622_ecc_regs,
+		.mode_shift = 4,
+		.errnum_bits = 5,
+		.errnum_shift = 5,
+	},
+	[SNAND_SOC_MT7629] = {
+		.ecc_caps = mt7622_ecc_caps,
+		.num_ecc_cap = ARRAY_SIZE(mt7622_ecc_caps),
+		.regs = mt7622_ecc_regs,
+		.mode_shift = 4,
+		.errnum_bits = 5,
+		.errnum_shift = 5,
+	},
+	[SNAND_SOC_MT7981] = {
+		.ecc_caps = mt7981_ecc_caps,
+		.num_ecc_cap = ARRAY_SIZE(mt7981_ecc_caps),
+		.regs = mt7981_ecc_regs,
+		.mode_shift = 5,
+		.errnum_bits = 5,
+		.errnum_shift = 8,
+	},
+	[SNAND_SOC_MT7986] = {
+		.ecc_caps = mt7986_ecc_caps,
+		.num_ecc_cap = ARRAY_SIZE(mt7986_ecc_caps),
+		.regs = mt7986_ecc_regs,
+		.mode_shift = 5,
+		.errnum_bits = 5,
+		.errnum_shift = 8,
+	},
+};
+
+static inline uint32_t ecc_read32(struct mtk_snand *snf, uint32_t reg)
+{
+	return readl(snf->ecc_base + reg);
+}
+
+static inline void ecc_write32(struct mtk_snand *snf, uint32_t reg,
+			       uint32_t val)
+{
+	writel(val, snf->ecc_base + reg);
+}
+
+static inline void ecc_write16(struct mtk_snand *snf, uint32_t reg,
+			       uint16_t val)
+{
+	writew(val, snf->ecc_base + reg);
+}
+
+static int mtk_ecc_poll(struct mtk_snand *snf, uint32_t reg, uint32_t bits)
+{
+	uint32_t val;
+
+	return read16_poll_timeout(snf->ecc_base + reg, val, (val & bits), 0,
+				   ECC_TIMEOUT);
+}
+
+static int mtk_ecc_wait_idle(struct mtk_snand *snf, uint32_t reg)
+{
+	int ret;
+
+	ret = mtk_ecc_poll(snf, reg, ECC_IDLE);
+	if (ret) {
+		snand_log_ecc(snf->pdev, "ECC engine is busy\n");
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+int mtk_ecc_setup(struct mtk_snand *snf, void *fmdaddr, uint32_t max_ecc_bytes,
+		  uint32_t msg_size)
+{
+	uint32_t i, val, ecc_msg_bits, ecc_strength;
+	int ret;
+
+	snf->ecc_soc = &mtk_ecc_socs[snf->soc];
+
+	snf->ecc_parity_bits = fls(1 + 8 * msg_size);
+	ecc_strength = max_ecc_bytes * 8 / snf->ecc_parity_bits;
+
+	for (i = snf->ecc_soc->num_ecc_cap - 1; i >= 0; i--) {
+		if (snf->ecc_soc->ecc_caps[i] <= ecc_strength)
+			break;
+	}
+
+	if (unlikely(i < 0)) {
+		snand_log_ecc(snf->pdev, "Page size %u+%u is not supported\n",
+			      snf->writesize, snf->oobsize);
+		return -ENOTSUPP;
+	}
+
+	snf->ecc_strength = snf->ecc_soc->ecc_caps[i];
+	snf->ecc_bytes = DIV_ROUND_UP(snf->ecc_strength * snf->ecc_parity_bits,
+				      8);
+
+	/* Encoder config */
+	ecc_write16(snf, ECC_ENCCON, 0);
+	ret = mtk_ecc_wait_idle(snf, ECC_ENCIDLE);
+	if (ret)
+		return ret;
+
+	ecc_msg_bits = msg_size * 8;
+	val = (ecc_msg_bits << ENC_MS_S) |
+	      (ECC_MODE_NFI << snf->ecc_soc->mode_shift) | i;
+	ecc_write32(snf, ECC_ENCCNFG, val);
+
+	/* Decoder config */
+	ecc_write16(snf, ECC_DECCON, 0);
+	ret = mtk_ecc_wait_idle(snf, ECC_DECIDLE);
+	if (ret)
+		return ret;
+
+	ecc_msg_bits += snf->ecc_strength * snf->ecc_parity_bits;
+	val = DEC_EMPTY_EN | (ecc_msg_bits << DEC_CS_S) |
+	      (DEC_CON_CORRECT << DEC_CON_S) |
+	      (ECC_MODE_NFI << snf->ecc_soc->mode_shift) | i;
+	ecc_write32(snf, ECC_DECCNFG, val);
+
+	return 0;
+}
+
+int mtk_snand_ecc_encoder_start(struct mtk_snand *snf)
+{
+	int ret;
+
+	ret = mtk_ecc_wait_idle(snf, ECC_ENCIDLE);
+	if (ret) {
+		ecc_write16(snf, ECC_ENCCON, 0);
+		mtk_ecc_wait_idle(snf, ECC_ENCIDLE);
+	}
+
+	ecc_write16(snf, ECC_ENCCON, ENC_EN);
+
+	return 0;
+}
+
+void mtk_snand_ecc_encoder_stop(struct mtk_snand *snf)
+{
+	mtk_ecc_wait_idle(snf, ECC_ENCIDLE);
+	ecc_write16(snf, ECC_ENCCON, 0);
+}
+
+int mtk_snand_ecc_decoder_start(struct mtk_snand *snf)
+{
+	int ret;
+
+	ret = mtk_ecc_wait_idle(snf, ECC_DECIDLE);
+	if (ret) {
+		ecc_write16(snf, ECC_DECCON, 0);
+		mtk_ecc_wait_idle(snf, ECC_DECIDLE);
+	}
+
+	ecc_write16(snf, ECC_DECCON, DEC_EN);
+
+	return 0;
+}
+
+void mtk_snand_ecc_decoder_stop(struct mtk_snand *snf)
+{
+	mtk_ecc_wait_idle(snf, ECC_DECIDLE);
+	ecc_write16(snf, ECC_DECCON, 0);
+}
+
+int mtk_ecc_wait_decoder_done(struct mtk_snand *snf)
+{
+	uint16_t val, step_mask = (1 << snf->ecc_steps) - 1;
+	uint32_t reg = snf->ecc_soc->regs[ECC_DECDONE];
+	int ret;
+
+	ret = read16_poll_timeout(snf->ecc_base + reg, val,
+				  (val & step_mask) == step_mask, 0,
+				  ECC_TIMEOUT);
+	if (ret)
+		snand_log_ecc(snf->pdev, "ECC decoder is busy\n");
+
+	return ret;
+}
+
+int mtk_ecc_check_decode_error(struct mtk_snand *snf)
+{
+	uint32_t i, regi, fi, errnum;
+	uint32_t errnum_shift = snf->ecc_soc->errnum_shift;
+	uint32_t errnum_mask = (1 << snf->ecc_soc->errnum_bits) - 1;
+	int ret = 0;
+
+	for (i = 0; i < snf->ecc_steps; i++) {
+		regi = i / 4;
+		fi = i % 4;
+
+		errnum = ecc_read32(snf, ECC_DECENUM(regi));
+		errnum = (errnum >> (fi * errnum_shift)) & errnum_mask;
+
+		if (errnum <= snf->ecc_strength) {
+			snf->sect_bf[i] = errnum;
+		} else {
+			snf->sect_bf[i] = -1;
+			ret = -EBADMSG;
+		}
+	}
+
+	return ret;
+}
+
+static int mtk_ecc_check_buf_bitflips(struct mtk_snand *snf, const void *buf,
+				      size_t len, uint32_t bitflips)
+{
+	const uint8_t *buf8 = buf;
+	const uint32_t *buf32;
+	uint32_t d, weight;
+
+	while (len && ((uintptr_t)buf8) % sizeof(uint32_t)) {
+		weight = hweight8(*buf8);
+		bitflips += BITS_PER_BYTE - weight;
+		buf8++;
+		len--;
+
+		if (bitflips > snf->ecc_strength)
+			return -EBADMSG;
+	}
+
+	buf32 = (const uint32_t *)buf8;
+	while (len >= sizeof(uint32_t)) {
+		d = *buf32;
+
+		if (d != ~0) {
+			weight = hweight32(d);
+			bitflips += sizeof(uint32_t) * BITS_PER_BYTE - weight;
+		}
+
+		buf32++;
+		len -= sizeof(uint32_t);
+
+		if (bitflips > snf->ecc_strength)
+			return -EBADMSG;
+	}
+
+	buf8 = (const uint8_t *)buf32;
+	while (len) {
+		weight = hweight8(*buf8);
+		bitflips += BITS_PER_BYTE - weight;
+		buf8++;
+		len--;
+
+		if (bitflips > snf->ecc_strength)
+			return -EBADMSG;
+	}
+
+	return bitflips;
+}
+
+static int mtk_ecc_check_parity_bitflips(struct mtk_snand *snf, const void *buf,
+					 uint32_t bits, uint32_t bitflips)
+{
+	uint32_t len, i;
+	uint8_t b;
+	int rc;
+
+	len = bits >> 3;
+	bits &= 7;
+
+	rc = mtk_ecc_check_buf_bitflips(snf, buf, len, bitflips);
+	if (!bits || rc < 0)
+		return rc;
+
+	bitflips = rc;
+
+	/* We want a precise count of bits */
+	b = ((const uint8_t *)buf)[len];
+	for (i = 0; i < bits; i++) {
+		if (!(b & BIT(i)))
+			bitflips++;
+	}
+
+	if (bitflips > snf->ecc_strength)
+		return -EBADMSG;
+
+	return bitflips;
+}
+
+static void mtk_ecc_reset_parity(void *buf, uint32_t bits)
+{
+	uint32_t len;
+
+	len = bits >> 3;
+	bits &= 7;
+
+	memset(buf, 0xff, len);
+
+	/* Only reset bits protected by ECC to 1 */
+	if (bits)
+		((uint8_t *)buf)[len] |= GENMASK(bits - 1, 0);
+}
+
+int mtk_ecc_fixup_empty_sector(struct mtk_snand *snf, uint32_t sect)
+{
+	uint32_t ecc_bytes = snf->spare_per_sector - snf->nfi_soc->fdm_size;
+	uint8_t *oob = snf->page_cache + snf->writesize;
+	uint8_t *data_ptr, *fdm_ptr, *ecc_ptr;
+	int bitflips = 0, ecc_bits, parity_bits;
+
+	parity_bits = fls(snf->nfi_soc->sector_size * 8);
+	ecc_bits = snf->ecc_strength * parity_bits;
+
+	data_ptr = snf->page_cache + sect * snf->nfi_soc->sector_size;
+	fdm_ptr = oob + sect * snf->nfi_soc->fdm_size;
+	ecc_ptr = oob + snf->ecc_steps * snf->nfi_soc->fdm_size +
+		  sect * ecc_bytes;
+
+	/*
+	 * Check whether DATA + FDM + ECC of a sector contains correctable
+	 * bitflips
+	 */
+	bitflips = mtk_ecc_check_buf_bitflips(snf, data_ptr,
+					      snf->nfi_soc->sector_size,
+					      bitflips);
+	if (bitflips < 0)
+		return -EBADMSG;
+
+	bitflips = mtk_ecc_check_buf_bitflips(snf, fdm_ptr,
+					      snf->nfi_soc->fdm_ecc_size,
+					      bitflips);
+	if (bitflips < 0)
+		return -EBADMSG;
+
+	bitflips = mtk_ecc_check_parity_bitflips(snf, ecc_ptr, ecc_bits,
+						 bitflips);
+	if (bitflips < 0)
+		return -EBADMSG;
+
+	if (!bitflips)
+		return 0;
+
+	/* Reset the data of this sector to 0xff */
+	memset(data_ptr, 0xff, snf->nfi_soc->sector_size);
+	memset(fdm_ptr, 0xff, snf->nfi_soc->fdm_ecc_size);
+	mtk_ecc_reset_parity(ecc_ptr, ecc_bits);
+
+	return bitflips;
+}
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand-ids.c
@@ -0,0 +1,515 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include "mtk-snand-def.h"
+
+static int mtk_snand_winbond_select_die(struct mtk_snand *snf, uint32_t dieidx);
+static int mtk_snand_micron_select_die(struct mtk_snand *snf, uint32_t dieidx);
+
+#define SNAND_MEMORG_512M_2K_64		SNAND_MEMORG(2048, 64, 64, 512, 1, 1)
+#define SNAND_MEMORG_1G_2K_64		SNAND_MEMORG(2048, 64, 64, 1024, 1, 1)
+#define SNAND_MEMORG_2G_2K_64		SNAND_MEMORG(2048, 64, 64, 2048, 1, 1)
+#define SNAND_MEMORG_2G_2K_120		SNAND_MEMORG(2048, 120, 64, 2048, 1, 1)
+#define SNAND_MEMORG_4G_2K_64		SNAND_MEMORG(2048, 64, 64, 4096, 1, 1)
+#define SNAND_MEMORG_1G_2K_120		SNAND_MEMORG(2048, 120, 64, 1024, 1, 1)
+#define SNAND_MEMORG_1G_2K_128		SNAND_MEMORG(2048, 128, 64, 1024, 1, 1)
+#define SNAND_MEMORG_2G_2K_128		SNAND_MEMORG(2048, 128, 64, 2048, 1, 1)
+#define SNAND_MEMORG_4G_2K_128		SNAND_MEMORG(2048, 128, 64, 4096, 1, 1)
+#define SNAND_MEMORG_4G_4K_240		SNAND_MEMORG(4096, 240, 64, 2048, 1, 1)
+#define SNAND_MEMORG_4G_4K_256		SNAND_MEMORG(4096, 256, 64, 2048, 1, 1)
+#define SNAND_MEMORG_8G_4K_256		SNAND_MEMORG(4096, 256, 64, 4096, 1, 1)
+#define SNAND_MEMORG_2G_2K_64_2P	SNAND_MEMORG(2048, 64, 64, 2048, 2, 1)
+#define SNAND_MEMORG_2G_2K_64_2D	SNAND_MEMORG(2048, 64, 64, 1024, 1, 2)
+#define SNAND_MEMORG_2G_2K_128_2P	SNAND_MEMORG(2048, 128, 64, 2048, 2, 1)
+#define SNAND_MEMORG_4G_2K_64_2P	SNAND_MEMORG(2048, 64, 64, 4096, 2, 1)
+#define SNAND_MEMORG_4G_2K_128_2P_2D	SNAND_MEMORG(2048, 128, 64, 2048, 2, 2)
+#define SNAND_MEMORG_8G_4K_256_2D	SNAND_MEMORG(4096, 256, 64, 2048, 1, 2)
+
+static const SNAND_IO_CAP(snand_cap_read_from_cache_quad,
+	SPI_IO_1_1_1 | SPI_IO_1_1_2 | SPI_IO_1_2_2 | SPI_IO_1_1_4 |
+	SPI_IO_1_4_4,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_READ_FROM_CACHE, 8),
+	SNAND_OP(SNAND_IO_1_1_2, SNAND_CMD_READ_FROM_CACHE_X2, 8),
+	SNAND_OP(SNAND_IO_1_2_2, SNAND_CMD_READ_FROM_CACHE_DUAL, 4),
+	SNAND_OP(SNAND_IO_1_1_4, SNAND_CMD_READ_FROM_CACHE_X4, 8),
+	SNAND_OP(SNAND_IO_1_4_4, SNAND_CMD_READ_FROM_CACHE_QUAD, 4));
+
+static const SNAND_IO_CAP(snand_cap_read_from_cache_quad_q2d,
+	SPI_IO_1_1_1 | SPI_IO_1_1_2 | SPI_IO_1_2_2 | SPI_IO_1_1_4 |
+	SPI_IO_1_4_4,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_READ_FROM_CACHE, 8),
+	SNAND_OP(SNAND_IO_1_1_2, SNAND_CMD_READ_FROM_CACHE_X2, 8),
+	SNAND_OP(SNAND_IO_1_2_2, SNAND_CMD_READ_FROM_CACHE_DUAL, 4),
+	SNAND_OP(SNAND_IO_1_1_4, SNAND_CMD_READ_FROM_CACHE_X4, 8),
+	SNAND_OP(SNAND_IO_1_4_4, SNAND_CMD_READ_FROM_CACHE_QUAD, 2));
+
+static const SNAND_IO_CAP(snand_cap_read_from_cache_quad_a8d,
+	SPI_IO_1_1_1 | SPI_IO_1_1_2 | SPI_IO_1_2_2 | SPI_IO_1_1_4 |
+	SPI_IO_1_4_4,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_READ_FROM_CACHE, 8),
+	SNAND_OP(SNAND_IO_1_1_2, SNAND_CMD_READ_FROM_CACHE_X2, 8),
+	SNAND_OP(SNAND_IO_1_2_2, SNAND_CMD_READ_FROM_CACHE_DUAL, 8),
+	SNAND_OP(SNAND_IO_1_1_4, SNAND_CMD_READ_FROM_CACHE_X4, 8),
+	SNAND_OP(SNAND_IO_1_4_4, SNAND_CMD_READ_FROM_CACHE_QUAD, 8));
+
+static const SNAND_IO_CAP(snand_cap_read_from_cache_x4,
+	SPI_IO_1_1_1 | SPI_IO_1_1_2 | SPI_IO_1_1_4,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_READ_FROM_CACHE, 8),
+	SNAND_OP(SNAND_IO_1_1_2, SNAND_CMD_READ_FROM_CACHE_X2, 8),
+	SNAND_OP(SNAND_IO_1_1_4, SNAND_CMD_READ_FROM_CACHE_X4, 8));
+
+static const SNAND_IO_CAP(snand_cap_read_from_cache_x4_only,
+	SPI_IO_1_1_1 | SPI_IO_1_1_4,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_READ_FROM_CACHE, 8),
+	SNAND_OP(SNAND_IO_1_1_4, SNAND_CMD_READ_FROM_CACHE_X4, 8));
+
+static const SNAND_IO_CAP(snand_cap_program_load_x1,
+	SPI_IO_1_1_1,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_PROGRAM_LOAD, 0));
+
+static const SNAND_IO_CAP(snand_cap_program_load_x4,
+	SPI_IO_1_1_1 | SPI_IO_1_1_4,
+	SNAND_OP(SNAND_IO_1_1_1, SNAND_CMD_PROGRAM_LOAD, 0),
+	SNAND_OP(SNAND_IO_1_1_4, SNAND_CMD_PROGRAM_LOAD_X4, 0));
+
+static const struct snand_flash_info snand_flash_ids[] = {
+	SNAND_INFO("W25N512GV", SNAND_ID(SNAND_ID_DYMMY, 0xef, 0xaa, 0x20),
+		   SNAND_MEMORG_512M_2K_64,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("W25N01GV", SNAND_ID(SNAND_ID_DYMMY, 0xef, 0xaa, 0x21),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("W25M02GV", SNAND_ID(SNAND_ID_DYMMY, 0xef, 0xab, 0x21),
+		   SNAND_MEMORG_2G_2K_64_2D,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4,
+		   mtk_snand_winbond_select_die),
+	SNAND_INFO("W25N01KV", SNAND_ID(SNAND_ID_DYMMY, 0xef, 0xae, 0x21),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("W25N02KV", SNAND_ID(SNAND_ID_DYMMY, 0xef, 0xaa, 0x22),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("GD5F1GQ4UAWxx", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0x10),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F1GQ4UExIG", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xd1),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F1GQ4UExxH", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xd9),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F1GQ4xAYIG", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xf1),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F2GQ4UExIG", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xd2),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F2GQ5UExxH", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0x32),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_a8d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F2GQ4xAYIG", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xf2),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F4GQ4UBxIG", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xd4),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F4GQ4xAYIG", SNAND_ID(SNAND_ID_ADDR, 0xc8, 0xf4),
+		   SNAND_MEMORG_4G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F2GQ5UExxG", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0x52),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_a8d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("GD5F4GQ4UCxIG", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0xb4),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("MX35LF1GE4AB", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x12),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF1G24AD", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x14),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX31LF1GE4BC", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x1e),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF2GE4AB", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x22),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF2G24AD", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x24),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF2GE4AD", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x26),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF2G14AC", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x20),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF4G24AD", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x35),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MX35LF4GE4AD", SNAND_ID(SNAND_ID_DYMMY, 0xc2, 0x37),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("MT29F1G01AAADD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x12),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x1),
+	SNAND_INFO("MT29F1G01ABAFD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x14),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MT29F2G01AAAED", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x9f),
+		   SNAND_MEMORG_2G_2K_64_2P,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x1),
+	SNAND_INFO("MT29F2G01ABAGD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x24),
+		   SNAND_MEMORG_2G_2K_128_2P,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MT29F4G01AAADD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x32),
+		   SNAND_MEMORG_4G_2K_64_2P,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x1),
+	SNAND_INFO("MT29F4G01ABAFD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x34),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("MT29F4G01ADAGD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x36),
+		   SNAND_MEMORG_4G_2K_128_2P_2D,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4,
+		   mtk_snand_micron_select_die),
+	SNAND_INFO("MT29F8G01ADAFD", SNAND_ID(SNAND_ID_DYMMY, 0x2c, 0x46),
+		   SNAND_MEMORG_8G_4K_256_2D,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4,
+		   mtk_snand_micron_select_die),
+
+	SNAND_INFO("TC58CVG0S3HRAIG", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xc2),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x1),
+	SNAND_INFO("TC58CVG1S3HRAIG", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xcb),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x1),
+	SNAND_INFO("TC58CVG2S0HRAIG", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xcd),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x1),
+	SNAND_INFO("TC58CVG0S3HRAIJ", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xe2),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("TC58CVG1S3HRAIJ", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xeb),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("TC58CVG2S0HRAIJ", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xed),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("TH58CVG3S0HRAIJ", SNAND_ID(SNAND_ID_DYMMY, 0x98, 0xe4),
+		   SNAND_MEMORG_8G_4K_256,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("F50L512M41A", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0x20),
+		   SNAND_MEMORG_512M_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("F50L1G41A", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0x21),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("F50L1G41LB", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0x01),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("F50L2G41LB", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0x0a),
+		   SNAND_MEMORG_2G_2K_64_2D,
+		   &snand_cap_read_from_cache_quad,
+		   &snand_cap_program_load_x4,
+		   mtk_snand_winbond_select_die),
+
+	SNAND_INFO("CS11G0T0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x00),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("CS11G0G0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x10),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("CS11G0S0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x20),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("CS11G1T0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x01),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("CS11G1S0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x21),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("CS11G2T0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x02),
+		   SNAND_MEMORG_4G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("CS11G2S0A0AA", SNAND_ID(SNAND_ID_DYMMY, 0x6b, 0x22),
+		   SNAND_MEMORG_4G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("EM73B044VCA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x01),
+		   SNAND_MEMORG_512M_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044SNB", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x11),
+		   SNAND_MEMORG_1G_2K_120,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044SNF", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x09),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044VCA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x18),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044SNA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x19),
+		   SNAND_MEMORG(2048, 64, 128, 512, 1, 1),
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044VCD", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x1c),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044SND", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x1d),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044SND", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x1e),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044VCC", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x22),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044VCF", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x25),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044SNC", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x31),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044SNC", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x0a),
+		   SNAND_MEMORG_2G_2K_120,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044SNA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x12),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044SNF", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x10),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x13),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCB", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x14),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCD", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x17),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCH", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x1b),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044SND", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x1d),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCG", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x1f),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCE", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x20),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCL", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x2e),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044SNB", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x32),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73E044SNA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x03),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73E044SND", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x0b),
+		   SNAND_MEMORG_4G_4K_240,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73E044SNB", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x23),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73E044VCA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x2c),
+		   SNAND_MEMORG_4G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73E044VCB", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x2f),
+		   SNAND_MEMORG_4G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73F044SNA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x24),
+		   SNAND_MEMORG_8G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73F044VCA", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x2d),
+		   SNAND_MEMORG_8G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73E044SNE", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x0e),
+		   SNAND_MEMORG_8G_4K_256,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73C044SNG", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x0c),
+		   SNAND_MEMORG_1G_2K_120,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("EM73D044VCN", SNAND_ID(SNAND_ID_DYMMY, 0xd5, 0x0f),
+		   SNAND_MEMORG_2G_2K_64,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("FM35Q1GA", SNAND_ID(SNAND_ID_DYMMY, 0xe5, 0x71),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("PN26G01A", SNAND_ID(SNAND_ID_DYMMY, 0xa1, 0xe1),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("PN26G02A", SNAND_ID(SNAND_ID_DYMMY, 0xa1, 0xe2),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("IS37SML01G1", SNAND_ID(SNAND_ID_DYMMY, 0xc8, 0x21),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("ATO25D1GA", SNAND_ID(SNAND_ID_DYMMY, 0x9b, 0x12),
+		   SNAND_MEMORG_1G_2K_64,
+		   &snand_cap_read_from_cache_x4_only,
+		   &snand_cap_program_load_x4),
+
+	SNAND_INFO("HYF1GQ4U", SNAND_ID(SNAND_ID_DYMMY, 0xc9, 0x51),
+		   SNAND_MEMORG_1G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+	SNAND_INFO("HYF2GQ4U", SNAND_ID(SNAND_ID_DYMMY, 0xc9, 0x52),
+		   SNAND_MEMORG_2G_2K_128,
+		   &snand_cap_read_from_cache_quad_q2d,
+		   &snand_cap_program_load_x4),
+};
+
+static int mtk_snand_winbond_select_die(struct mtk_snand *snf, uint32_t dieidx)
+{
+	uint8_t op[2];
+
+	if (dieidx > 1) {
+		snand_log_chip(snf->pdev, "Invalid die index %u\n", dieidx);
+		return -EINVAL;
+	}
+
+	op[0] = SNAND_CMD_WINBOND_SELECT_DIE;
+	op[1] = (uint8_t)dieidx;
+
+	return mtk_snand_mac_io(snf, op, sizeof(op), NULL, 0);
+}
+
+static int mtk_snand_micron_select_die(struct mtk_snand *snf, uint32_t dieidx)
+{
+	int ret;
+
+	if (dieidx > 1) {
+		snand_log_chip(snf->pdev, "Invalid die index %u\n", dieidx);
+		return -EINVAL;
+	}
+
+	ret = mtk_snand_set_feature(snf, SNAND_FEATURE_MICRON_DIE_ADDR,
+				    SNAND_MICRON_DIE_SEL_1);
+	if (ret) {
+		snand_log_chip(snf->pdev,
+			       "Failed to set die selection feature\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+const struct snand_flash_info *snand_flash_id_lookup(enum snand_id_type type,
+						     const uint8_t *id)
+{
+	const struct snand_id *fid;
+	uint32_t i;
+
+	for (i = 0; i < ARRAY_SIZE(snand_flash_ids); i++) {
+		if (snand_flash_ids[i].id.type != type)
+			continue;
+
+		fid = &snand_flash_ids[i].id;
+		if (memcmp(fid->id, id, fid->len))
+			continue;
+
+		return &snand_flash_ids[i];
+	}
+
+	return NULL;
+}
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand-mtd.c
@@ -0,0 +1,535 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <linux/mtd/mtd.h>
+#include <watchdog.h>
+
+#include "mtk-snand.h"
+
+struct mtk_snand_mtd {
+	struct udevice *dev;
+	struct mtk_snand *snf;
+	struct mtk_snand_chip_info cinfo;
+	uint8_t *page_cache;
+};
+
+static const char snand_mtd_name_prefix[] = "spi-nand";
+
+static u32 snandidx;
+
+static inline struct mtk_snand_mtd *mtd_to_msm(struct mtd_info *mtd)
+{
+	return mtd->priv;
+}
+
+static int mtk_snand_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+	u64 start_addr, end_addr;
+	int ret;
+
+	/* Do not allow write past end of device */
+	if ((instr->addr + instr->len) > mtd->size) {
+		pr_debug("%s: attempt to erase beyond end of device\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	start_addr = instr->addr & (~mtd->erasesize_mask);
+	end_addr = instr->addr + instr->len;
+	if (end_addr & mtd->erasesize_mask) {
+		end_addr = (end_addr + mtd->erasesize_mask) &
+			   (~mtd->erasesize_mask);
+	}
+
+	instr->state = MTD_ERASING;
+
+	while (start_addr < end_addr) {
+		schedule();
+
+		if (mtk_snand_block_isbad(msm->snf, start_addr)) {
+			if (!instr->scrub) {
+				instr->fail_addr = start_addr;
+				ret = -EIO;
+				break;
+			}
+		}
+
+		ret = mtk_snand_erase_block(msm->snf, start_addr);
+		if (ret) {
+			instr->fail_addr = start_addr;
+			break;
+		}
+
+		start_addr += mtd->erasesize;
+	}
+
+	if (!ret) {
+		instr->state = MTD_ERASE_DONE;
+	} else {
+		instr->state = MTD_ERASE_FAILED;
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static int mtk_snand_mtd_read_data(struct mtk_snand_mtd *msm, uint64_t addr,
+				   struct mtd_oob_ops *ops)
+{
+	struct mtd_info *mtd = dev_get_uclass_priv(msm->dev);
+	size_t len, ooblen, maxooblen, chklen;
+	uint32_t col, ooboffs;
+	uint8_t *datcache, *oobcache;
+	bool ecc_failed = false, raw = ops->mode == MTD_OPS_RAW ? true : false;
+	int ret, max_bitflips = 0;
+
+	col = addr & mtd->writesize_mask;
+	addr &= ~mtd->writesize_mask;
+	maxooblen = mtd_oobavail(mtd, ops);
+	ooboffs = ops->ooboffs;
+	ooblen = ops->ooblen;
+	len = ops->len;
+
+	datcache = len ? msm->page_cache : NULL;
+	oobcache = ooblen ? msm->page_cache + mtd->writesize : NULL;
+
+	ops->oobretlen = 0;
+	ops->retlen = 0;
+
+	while (len || ooblen) {
+		schedule();
+
+		if (ops->mode == MTD_OPS_AUTO_OOB)
+			ret = mtk_snand_read_page_auto_oob(msm->snf, addr,
+				datcache, oobcache, maxooblen, NULL, raw);
+		else
+			ret = mtk_snand_read_page(msm->snf, addr, datcache,
+				oobcache, raw);
+
+		if (ret < 0 && ret != -EBADMSG)
+			return ret;
+
+		if (ret == -EBADMSG) {
+			mtd->ecc_stats.failed++;
+			ecc_failed = true;
+		} else {
+			mtd->ecc_stats.corrected += ret;
+			max_bitflips = max_t(int, ret, max_bitflips);
+		}
+
+		mtd->ecc_stats.corrected += ret;
+		max_bitflips = max_t(int, ret, max_bitflips);
+
+		if (len) {
+			/* Move data */
+			chklen = mtd->writesize - col;
+			if (chklen > len)
+				chklen = len;
+
+			memcpy(ops->datbuf + ops->retlen, datcache + col,
+			       chklen);
+			len -= chklen;
+			col = 0; /* (col + chklen) %  */
+			ops->retlen += chklen;
+		}
+
+		if (ooblen) {
+			/* Move oob */
+			chklen = maxooblen - ooboffs;
+			if (chklen > ooblen)
+				chklen = ooblen;
+
+			memcpy(ops->oobbuf + ops->oobretlen, oobcache + ooboffs,
+			       chklen);
+			ooblen -= chklen;
+			ooboffs = 0; /* (ooboffs + chklen) % maxooblen; */
+			ops->oobretlen += chklen;
+		}
+
+		addr += mtd->writesize;
+	}
+
+	return ecc_failed ? -EBADMSG : max_bitflips;
+}
+
+static int mtk_snand_mtd_read_oob(struct mtd_info *mtd, loff_t from,
+				  struct mtd_oob_ops *ops)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+	uint32_t maxooblen;
+
+	if (!ops->oobbuf && !ops->datbuf) {
+		if (ops->ooblen || ops->len)
+			return -EINVAL;
+
+		return 0;
+	}
+
+	switch (ops->mode) {
+	case MTD_OPS_PLACE_OOB:
+	case MTD_OPS_AUTO_OOB:
+	case MTD_OPS_RAW:
+		break;
+	default:
+		pr_debug("%s: unsupported oob mode: %u\n", __func__, ops->mode);
+		return -EINVAL;
+	}
+
+	maxooblen = mtd_oobavail(mtd, ops);
+
+	/* Do not allow read past end of device */
+	if (ops->datbuf && (from + ops->len) > mtd->size) {
+		pr_debug("%s: attempt to read beyond end of device\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	if (unlikely(ops->ooboffs >= maxooblen)) {
+		pr_debug("%s: attempt to start read outside oob\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	if (unlikely(from >= mtd->size ||
+	    ops->ooboffs + ops->ooblen > ((mtd->size >> mtd->writesize_shift) -
+	    (from >> mtd->writesize_shift)) * maxooblen)) {
+		pr_debug("%s: attempt to read beyond end of device\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	return mtk_snand_mtd_read_data(msm, from, ops);
+}
+
+static int mtk_snand_mtd_write_data(struct mtk_snand_mtd *msm, uint64_t addr,
+				    struct mtd_oob_ops *ops)
+{
+	struct mtd_info *mtd = dev_get_uclass_priv(msm->dev);
+	size_t len, ooblen, maxooblen, chklen, oobwrlen;
+	uint32_t col, ooboffs;
+	uint8_t *datcache, *oobcache;
+	bool raw = ops->mode == MTD_OPS_RAW ? true : false;
+	int ret;
+
+	col = addr & mtd->writesize_mask;
+	addr &= ~mtd->writesize_mask;
+	maxooblen = mtd_oobavail(mtd, ops);
+	ooboffs = ops->ooboffs;
+	ooblen = ops->ooblen;
+	len = ops->len;
+
+	datcache = len ? msm->page_cache : NULL;
+	oobcache = ooblen ? msm->page_cache + mtd->writesize : NULL;
+
+	ops->oobretlen = 0;
+	ops->retlen = 0;
+
+	while (len || ooblen) {
+		schedule();
+
+		if (len) {
+			/* Move data */
+			chklen = mtd->writesize - col;
+			if (chklen > len)
+				chklen = len;
+
+			memset(datcache, 0xff, col);
+			memcpy(datcache + col, ops->datbuf + ops->retlen,
+			       chklen);
+			memset(datcache + col + chklen, 0xff,
+			       mtd->writesize - col - chklen);
+			len -= chklen;
+			col = 0; /* (col + chklen) %  */
+			ops->retlen += chklen;
+		}
+
+		oobwrlen = 0;
+		if (ooblen) {
+			/* Move oob */
+			chklen = maxooblen - ooboffs;
+			if (chklen > ooblen)
+				chklen = ooblen;
+
+			memset(oobcache, 0xff, ooboffs);
+			memcpy(oobcache + ooboffs,
+			       ops->oobbuf + ops->oobretlen, chklen);
+			memset(oobcache + ooboffs + chklen, 0xff,
+			       mtd->oobsize - ooboffs - chklen);
+			oobwrlen = chklen + ooboffs;
+			ooblen -= chklen;
+			ooboffs = 0; /* (ooboffs + chklen) % maxooblen; */
+			ops->oobretlen += chklen;
+		}
+
+		if (ops->mode == MTD_OPS_AUTO_OOB)
+			ret = mtk_snand_write_page_auto_oob(msm->snf, addr,
+				datcache, oobcache, oobwrlen, NULL, raw);
+		else
+			ret = mtk_snand_write_page(msm->snf, addr, datcache,
+				oobcache, raw);
+
+		if (ret)
+			return ret;
+
+		addr += mtd->writesize;
+	}
+
+	return 0;
+}
+
+static int mtk_snand_mtd_write_oob(struct mtd_info *mtd, loff_t to,
+				   struct mtd_oob_ops *ops)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+	uint32_t maxooblen;
+
+	if (!ops->oobbuf && !ops->datbuf) {
+		if (ops->ooblen || ops->len)
+			return -EINVAL;
+
+		return 0;
+	}
+
+	switch (ops->mode) {
+	case MTD_OPS_PLACE_OOB:
+	case MTD_OPS_AUTO_OOB:
+	case MTD_OPS_RAW:
+		break;
+	default:
+		pr_debug("%s: unsupported oob mode: %u\n", __func__, ops->mode);
+		return -EINVAL;
+	}
+
+	maxooblen = mtd_oobavail(mtd, ops);
+
+	/* Do not allow write past end of device */
+	if (ops->datbuf && (to + ops->len) > mtd->size) {
+		pr_debug("%s: attempt to write beyond end of device\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	if (unlikely(ops->ooboffs >= maxooblen)) {
+		pr_debug("%s: attempt to start write outside oob\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	if (unlikely(to >= mtd->size ||
+	    ops->ooboffs + ops->ooblen > ((mtd->size >> mtd->writesize_shift) -
+	    (to >> mtd->writesize_shift)) * maxooblen)) {
+		pr_debug("%s: attempt to write beyond end of device\n",
+			 __func__);
+		return -EINVAL;
+	}
+
+	return mtk_snand_mtd_write_data(msm, to, ops);
+}
+
+static int mtk_snand_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
+			      size_t *retlen, u_char *buf)
+{
+	struct mtd_oob_ops ops = {
+		.mode = MTD_OPS_PLACE_OOB,
+		.datbuf = buf,
+		.len = len,
+	};
+	int ret;
+
+	ret = mtk_snand_mtd_read_oob(mtd, from, &ops);
+
+	if (retlen)
+		*retlen = ops.retlen;
+
+	return ret;
+}
+
+static int mtk_snand_mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
+			       size_t *retlen, const u_char *buf)
+{
+	struct mtd_oob_ops ops = {
+		.mode = MTD_OPS_PLACE_OOB,
+		.datbuf = (void *)buf,
+		.len = len,
+	};
+	int ret;
+
+	ret = mtk_snand_mtd_write_oob(mtd, to, &ops);
+
+	if (retlen)
+		*retlen = ops.retlen;
+
+	return ret;
+}
+
+static int mtk_snand_mtd_block_isbad(struct mtd_info *mtd, loff_t offs)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+
+	return mtk_snand_block_isbad(msm->snf, offs);
+}
+
+static int mtk_snand_mtd_block_markbad(struct mtd_info *mtd, loff_t offs)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+
+	return mtk_snand_block_markbad(msm->snf, offs);
+}
+
+static int mtk_snand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobecc)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobecc->offset = msm->cinfo.fdm_size * msm->cinfo.num_sectors;
+	oobecc->length = mtd->oobsize - oobecc->offset;
+
+	return 0;
+}
+
+static int mtk_snand_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobfree)
+{
+	struct mtk_snand_mtd *msm = mtd_to_msm(mtd);
+
+	if (section >= msm->cinfo.num_sectors)
+		return -ERANGE;
+
+	oobfree->length = msm->cinfo.fdm_size - 1;
+	oobfree->offset = section * msm->cinfo.fdm_size + 1;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mtk_snand_ooblayout = {
+	.ecc = mtk_snand_ooblayout_ecc,
+	.rfree = mtk_snand_ooblayout_free,
+};
+
+static int mtk_snand_mtd_probe(struct udevice *dev)
+{
+	struct mtk_snand_mtd *msm = dev_get_priv(dev);
+	struct mtd_info *mtd = dev_get_uclass_priv(dev);
+	struct mtk_snand_platdata mtk_snand_pdata = {};
+	size_t namelen;
+	fdt_addr_t base;
+	int ret;
+
+	base = dev_read_addr_name(dev, "nfi");
+	if (base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+	mtk_snand_pdata.nfi_base = map_sysmem(base, 0);
+
+	base = dev_read_addr_name(dev, "ecc");
+	if (base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+	mtk_snand_pdata.ecc_base = map_sysmem(base, 0);
+
+	mtk_snand_pdata.soc = dev_get_driver_data(dev);
+	mtk_snand_pdata.quad_spi = dev_read_bool(dev, "quad-spi");
+
+	ret = mtk_snand_init(NULL, &mtk_snand_pdata, &msm->snf);
+	if (ret)
+		return ret;
+
+	mtk_snand_get_chip_info(msm->snf, &msm->cinfo);
+
+	msm->page_cache = malloc(msm->cinfo.pagesize + msm->cinfo.sparesize);
+	if (!msm->page_cache) {
+		printf("%s: failed to allocate memory for page cache\n",
+		       __func__);
+		ret = -ENOMEM;
+		goto errout1;
+	}
+
+	namelen = sizeof(snand_mtd_name_prefix) + 12;
+
+	mtd->name = malloc(namelen);
+	if (!mtd->name) {
+		printf("%s: failed to allocate memory for MTD name\n",
+		       __func__);
+		ret = -ENOMEM;
+		goto errout2;
+	}
+
+	msm->dev = dev;
+
+	snprintf(mtd->name, namelen, "%s%u", snand_mtd_name_prefix, snandidx++);
+
+	mtd->priv = msm;
+	mtd->dev = dev;
+	mtd->type = MTD_NANDFLASH;
+	mtd->flags = MTD_CAP_NANDFLASH;
+
+	mtd->size = msm->cinfo.chipsize;
+	mtd->erasesize = msm->cinfo.blocksize;
+	mtd->writesize = msm->cinfo.pagesize;
+	mtd->writebufsize = mtd->writesize;
+	mtd->oobsize = msm->cinfo.sparesize;
+	mtd->oobavail = msm->cinfo.num_sectors * (msm->cinfo.fdm_size - 1);
+
+	mtd->ooblayout = &mtk_snand_ooblayout;
+
+	mtd->ecc_strength = msm->cinfo.ecc_strength;
+	mtd->bitflip_threshold = (mtd->ecc_strength * 3) / 4;
+	mtd->ecc_step_size = msm->cinfo.sector_size;
+
+	mtd->_read = mtk_snand_mtd_read;
+	mtd->_write = mtk_snand_mtd_write;
+	mtd->_erase = mtk_snand_mtd_erase;
+	mtd->_read_oob = mtk_snand_mtd_read_oob;
+	mtd->_write_oob = mtk_snand_mtd_write_oob;
+	mtd->_block_isbad = mtk_snand_mtd_block_isbad;
+	mtd->_block_markbad = mtk_snand_mtd_block_markbad;
+
+	ret = add_mtd_device(mtd);
+	if (ret) {
+		printf("%s: failed to add SPI-NAND MTD device\n", __func__);
+		ret = -ENODEV;
+		goto errout3;
+	}
+
+	printf("SPI-NAND: %s (%lluMB)\n", msm->cinfo.model,
+	       msm->cinfo.chipsize >> 20);
+
+	return 0;
+
+errout3:
+	free(mtd->name);
+
+errout2:
+	free(msm->page_cache);
+
+errout1:
+	mtk_snand_cleanup(msm->snf);
+
+	return ret;
+}
+
+static const struct udevice_id mtk_snand_ids[] = {
+	{ .compatible = "mediatek,mt7622-snand", .data = SNAND_SOC_MT7622 },
+	{ .compatible = "mediatek,mt7629-snand", .data = SNAND_SOC_MT7629 },
+	{ .compatible = "mediatek,mt7981-snand", .data = SNAND_SOC_MT7981 },
+	{ .compatible = "mediatek,mt7986-snand", .data = SNAND_SOC_MT7986 },
+	{ /* sentinel */ },
+};
+
+U_BOOT_DRIVER(spinand) = {
+	.name = "mtk-snand",
+	.id = UCLASS_MTD,
+	.of_match = mtk_snand_ids,
+	.priv_auto = sizeof(struct mtk_snand_mtd),
+	.probe = mtk_snand_mtd_probe,
+};
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand-os.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include "mtk-snand-def.h"
+
+int mtk_snand_log(struct mtk_snand_plat_dev *pdev,
+		  enum mtk_snand_log_category cat, const char *fmt, ...)
+{
+	const char *catname = "";
+	va_list ap;
+	int ret;
+
+	switch (cat) {
+	case SNAND_LOG_NFI:
+		catname = "NFI: ";
+		break;
+	case SNAND_LOG_SNFI:
+		catname = "SNFI: ";
+		break;
+	case SNAND_LOG_ECC:
+		catname = "ECC: ";
+		break;
+	default:
+		break;
+	}
+
+	puts("SPI-NAND: ");
+	puts(catname);
+
+	va_start(ap, fmt);
+	ret = vprintf(fmt, ap);
+	va_end(ap);
+
+	return ret;
+}
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand-os.h
@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef _MTK_SNAND_OS_H_
+#define _MTK_SNAND_OS_H_
+
+#include <common.h>
+#include <cpu_func.h>
+#include <errno.h>
+#include <div64.h>
+#include <malloc.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <linux/types.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+#include <linux/sizes.h>
+#include <linux/iopoll.h>
+
+#ifndef ARCH_DMA_MINALIGN
+#define ARCH_DMA_MINALIGN		64
+#endif
+
+struct mtk_snand_plat_dev {
+	ulong unused;
+};
+
+/* Polling helpers */
+#define read16_poll_timeout(addr, val, cond, sleep_us, timeout_us) \
+	readw_poll_timeout((addr), (val), (cond), (timeout_us))
+
+#define read32_poll_timeout(addr, val, cond, sleep_us, timeout_us) \
+	readl_poll_timeout((addr), (val), (cond), (timeout_us))
+
+/* Timer helpers */
+typedef uint64_t mtk_snand_time_t;
+
+static inline mtk_snand_time_t timer_get_ticks(void)
+{
+	return get_ticks();
+}
+
+static inline mtk_snand_time_t timer_time_to_tick(uint32_t timeout_us)
+{
+	return usec_to_tick(timeout_us);
+}
+
+static inline bool timer_is_timeout(mtk_snand_time_t start_tick,
+				    mtk_snand_time_t timeout_tick)
+{
+	return get_ticks() - start_tick > timeout_tick;
+}
+
+/* Memory helpers */
+static inline void *generic_mem_alloc(struct mtk_snand_plat_dev *pdev,
+				      size_t size)
+{
+	return calloc(1, size);
+}
+
+static inline void generic_mem_free(struct mtk_snand_plat_dev *pdev, void *ptr)
+{
+	free(ptr);
+}
+
+static inline void *dma_mem_alloc(struct mtk_snand_plat_dev *pdev, size_t size)
+{
+	return memalign(ARCH_DMA_MINALIGN, size);
+}
+
+static inline void dma_mem_free(struct mtk_snand_plat_dev *pdev, void *ptr)
+{
+	free(ptr);
+}
+
+static inline int dma_mem_map(struct mtk_snand_plat_dev *pdev, void *vaddr,
+			      uintptr_t *dma_addr, size_t size, bool to_device)
+{
+	size_t cachelen = roundup(size, ARCH_DMA_MINALIGN);
+	uintptr_t endaddr = (uintptr_t)vaddr + cachelen;
+
+	if (to_device)
+		flush_dcache_range((uintptr_t)vaddr, endaddr);
+	else
+		invalidate_dcache_range((uintptr_t)vaddr, endaddr);
+
+	*dma_addr = (uintptr_t)vaddr;
+
+	return 0;
+}
+
+static inline void dma_mem_unmap(struct mtk_snand_plat_dev *pdev,
+				 uintptr_t dma_addr, size_t size,
+				 bool to_device)
+{
+}
+
+/* Interrupt helpers */
+static inline void irq_completion_done(struct mtk_snand_plat_dev *pdev)
+{
+}
+
+static inline void irq_completion_init(struct mtk_snand_plat_dev *pdev)
+{
+}
+
+static inline int irq_completion_wait(struct mtk_snand_plat_dev *pdev,
+				      void __iomem *reg, uint32_t bit,
+				      uint32_t timeout_us)
+{
+	uint32_t val;
+
+	return read32_poll_timeout(reg, val, val & bit, 0, timeout_us);
+}
+
+#endif /* _MTK_SNAND_OS_H_ */
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand.c
@@ -0,0 +1,1933 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#include "mtk-snand-def.h"
+
+/* NFI registers */
+#define NFI_CNFG			0x000
+#define CNFG_OP_MODE_S			12
+#define   CNFG_OP_MODE_CUST		6
+#define   CNFG_OP_MODE_PROGRAM		3
+#define CNFG_AUTO_FMT_EN		BIT(9)
+#define CNFG_HW_ECC_EN			BIT(8)
+#define CNFG_DMA_BURST_EN		BIT(2)
+#define CNFG_READ_MODE			BIT(1)
+#define CNFG_DMA_MODE			BIT(0)
+
+#define NFI_PAGEFMT			0x0004
+#define NFI_SPARE_SIZE_LS_S		16
+#define NFI_FDM_ECC_NUM_S		12
+#define NFI_FDM_NUM_S			8
+#define NFI_SPARE_SIZE_S		4
+#define NFI_SEC_SEL_512			BIT(2)
+#define NFI_PAGE_SIZE_S			0
+#define   NFI_PAGE_SIZE_512_2K		0
+#define   NFI_PAGE_SIZE_2K_4K		1
+#define   NFI_PAGE_SIZE_4K_8K		2
+#define   NFI_PAGE_SIZE_8K_16K		3
+
+#define NFI_CON				0x008
+#define CON_SEC_NUM_S			12
+#define CON_BWR				BIT(9)
+#define CON_BRD				BIT(8)
+#define CON_NFI_RST			BIT(1)
+#define CON_FIFO_FLUSH			BIT(0)
+
+#define NFI_INTR_EN			0x010
+#define NFI_INTR_STA			0x014
+#define NFI_IRQ_INTR_EN			BIT(31)
+#define NFI_IRQ_CUS_READ		BIT(8)
+#define NFI_IRQ_CUS_PG			BIT(7)
+
+#define NFI_CMD				0x020
+
+#define NFI_STRDATA			0x040
+#define STR_DATA			BIT(0)
+
+#define NFI_STA				0x060
+#define NFI_NAND_FSM			GENMASK(28, 24)
+#define NFI_FSM				GENMASK(19, 16)
+#define READ_EMPTY			BIT(12)
+
+#define NFI_FIFOSTA			0x064
+#define FIFO_WR_REMAIN_S		8
+#define FIFO_RD_REMAIN_S		0
+
+#define NFI_ADDRCNTR			0x070
+#define SEC_CNTR			GENMASK(16, 12)
+#define SEC_CNTR_S			12
+#define NFI_SEC_CNTR(val)               (((val) & SEC_CNTR) >> SEC_CNTR_S)
+
+#define NFI_STRADDR			0x080
+
+#define NFI_BYTELEN			0x084
+#define BUS_SEC_CNTR(val)		(((val) & SEC_CNTR) >> SEC_CNTR_S)
+
+#define NFI_FDM0L			0x0a0
+#define NFI_FDM0M			0x0a4
+#define NFI_FDML(n)			(NFI_FDM0L + (n) * 8)
+#define NFI_FDMM(n)			(NFI_FDM0M + (n) * 8)
+
+#define NFI_DEBUG_CON1			0x220
+#define WBUF_EN				BIT(2)
+
+#define NFI_MASTERSTA			0x224
+#define MAS_ADDR			GENMASK(11, 9)
+#define MAS_RD				GENMASK(8, 6)
+#define MAS_WR				GENMASK(5, 3)
+#define MAS_RDDLY			GENMASK(2, 0)
+#define NFI_MASTERSTA_MASK_7622		(MAS_ADDR | MAS_RD | MAS_WR | MAS_RDDLY)
+#define AHB_BUS_BUSY			BIT(1)
+#define BUS_BUSY			BIT(0)
+#define NFI_MASTERSTA_MASK_7981		(AHB_BUS_BUSY | BUS_BUSY)
+#define NFI_MASTERSTA_MASK_7986		(AHB_BUS_BUSY | BUS_BUSY)
+
+/* SNFI registers */
+#define SNF_MAC_CTL			0x500
+#define MAC_XIO_SEL			BIT(4)
+#define SF_MAC_EN			BIT(3)
+#define SF_TRIG				BIT(2)
+#define WIP_READY			BIT(1)
+#define WIP				BIT(0)
+
+#define SNF_MAC_OUTL			0x504
+#define SNF_MAC_INL			0x508
+
+#define SNF_RD_CTL2			0x510
+#define DATA_READ_DUMMY_S		8
+#define DATA_READ_CMD_S			0
+
+#define SNF_RD_CTL3			0x514
+
+#define SNF_PG_CTL1			0x524
+#define PG_LOAD_CMD_S			8
+
+#define SNF_PG_CTL2			0x528
+
+#define SNF_MISC_CTL			0x538
+#define SW_RST				BIT(28)
+#define FIFO_RD_LTC_S			25
+#define PG_LOAD_X4_EN			BIT(20)
+#define DATA_READ_MODE_S		16
+#define DATA_READ_MODE			GENMASK(18, 16)
+#define   DATA_READ_MODE_X1		0
+#define   DATA_READ_MODE_X2		1
+#define   DATA_READ_MODE_X4		2
+#define   DATA_READ_MODE_DUAL		5
+#define   DATA_READ_MODE_QUAD		6
+#define LATCH_LAT_S			8
+#define LATCH_LAT			GENMASK(9, 8)
+#define PG_LOAD_CUSTOM_EN		BIT(7)
+#define DATARD_CUSTOM_EN		BIT(6)
+#define CS_DESELECT_CYC_S		0
+
+#define SNF_MISC_CTL2			0x53c
+#define PROGRAM_LOAD_BYTE_NUM_S		16
+#define READ_DATA_BYTE_NUM_S		11
+
+#define SNF_DLY_CTL3			0x548
+#define SFCK_SAM_DLY_S			0
+
+#define SNF_STA_CTL1			0x550
+#define CUS_PG_DONE			BIT(28)
+#define CUS_READ_DONE			BIT(27)
+#define SPI_STATE_S			0
+#define SPI_STATE			GENMASK(3, 0)
+
+#define SNF_CFG				0x55c
+#define SPI_MODE			BIT(0)
+
+#define SNF_GPRAM			0x800
+#define SNF_GPRAM_SIZE			0xa0
+
+#define SNFI_POLL_INTERVAL		1000000
+
+static const uint8_t mt7622_spare_sizes[] = { 16, 26, 27, 28 };
+
+static const uint8_t mt7981_spare_sizes[] = {
+	16, 26, 27, 28, 32, 36, 40, 44, 48, 49, 50, 51, 52, 62, 61, 63, 64,
+	67, 74
+};
+
+static const uint8_t mt7986_spare_sizes[] = {
+	16, 26, 27, 28, 32, 36, 40, 44, 48, 49, 50, 51, 52, 62, 61, 63, 64,
+	67, 74
+};
+
+static const struct mtk_snand_soc_data mtk_snand_socs[__SNAND_SOC_MAX] = {
+	[SNAND_SOC_MT7622] = {
+		.sector_size = 512,
+		.max_sectors = 8,
+		.fdm_size = 8,
+		.fdm_ecc_size = 1,
+		.fifo_size = 32,
+		.bbm_swap = false,
+		.empty_page_check = false,
+		.mastersta_mask = NFI_MASTERSTA_MASK_7622,
+		.spare_sizes = mt7622_spare_sizes,
+		.num_spare_size = ARRAY_SIZE(mt7622_spare_sizes),
+		.latch_lat = 0,
+		.sample_delay = 40
+	},
+	[SNAND_SOC_MT7629] = {
+		.sector_size = 512,
+		.max_sectors = 8,
+		.fdm_size = 8,
+		.fdm_ecc_size = 1,
+		.fifo_size = 32,
+		.bbm_swap = true,
+		.empty_page_check = false,
+		.mastersta_mask = NFI_MASTERSTA_MASK_7622,
+		.spare_sizes = mt7622_spare_sizes,
+		.num_spare_size = ARRAY_SIZE(mt7622_spare_sizes),
+		.latch_lat = 0,
+		.sample_delay = 40
+	},
+	[SNAND_SOC_MT7981] = {
+		.sector_size = 1024,
+		.max_sectors = 16,
+		.fdm_size = 8,
+		.fdm_ecc_size = 1,
+		.fifo_size = 64,
+		.bbm_swap = true,
+		.empty_page_check = true,
+		.mastersta_mask = NFI_MASTERSTA_MASK_7981,
+		.spare_sizes = mt7981_spare_sizes,
+		.num_spare_size = ARRAY_SIZE(mt7981_spare_sizes),
+		.latch_lat = 0,
+		.sample_delay = 40
+	},
+	[SNAND_SOC_MT7986] = {
+		.sector_size = 1024,
+		.max_sectors = 16,
+		.fdm_size = 8,
+		.fdm_ecc_size = 1,
+		.fifo_size = 64,
+		.bbm_swap = true,
+		.empty_page_check = true,
+		.mastersta_mask = NFI_MASTERSTA_MASK_7986,
+		.spare_sizes = mt7986_spare_sizes,
+		.num_spare_size = ARRAY_SIZE(mt7986_spare_sizes),
+		.latch_lat = 0,
+		.sample_delay = 40
+	},
+};
+
+static inline uint32_t nfi_read32(struct mtk_snand *snf, uint32_t reg)
+{
+	return readl(snf->nfi_base + reg);
+}
+
+static inline void nfi_write32(struct mtk_snand *snf, uint32_t reg,
+			       uint32_t val)
+{
+	writel(val, snf->nfi_base + reg);
+}
+
+static inline void nfi_write16(struct mtk_snand *snf, uint32_t reg,
+			       uint16_t val)
+{
+	writew(val, snf->nfi_base + reg);
+}
+
+static inline void nfi_rmw32(struct mtk_snand *snf, uint32_t reg, uint32_t clr,
+			     uint32_t set)
+{
+	uint32_t val;
+
+	val = readl(snf->nfi_base + reg);
+	val &= ~clr;
+	val |= set;
+	writel(val, snf->nfi_base + reg);
+}
+
+static void nfi_write_data(struct mtk_snand *snf, uint32_t reg,
+			   const uint8_t *data, uint32_t len)
+{
+	uint32_t i, val = 0, es = sizeof(uint32_t);
+
+	for (i = reg; i < reg + len; i++) {
+		val |= ((uint32_t)*data++) << (8 * (i % es));
+
+		if (i % es == es - 1 || i == reg + len - 1) {
+			nfi_write32(snf, i & ~(es - 1), val);
+			val = 0;
+		}
+	}
+}
+
+static void nfi_read_data(struct mtk_snand *snf, uint32_t reg, uint8_t *data,
+			  uint32_t len)
+{
+	uint32_t i, val = 0, es = sizeof(uint32_t);
+
+	for (i = reg; i < reg + len; i++) {
+		if (i == reg || i % es == 0)
+			val = nfi_read32(snf, i & ~(es - 1));
+
+		*data++ = (uint8_t)(val >> (8 * (i % es)));
+	}
+}
+
+static inline void do_bm_swap(uint8_t *bm1, uint8_t *bm2)
+{
+	uint8_t tmp = *bm1;
+	*bm1 = *bm2;
+	*bm2 = tmp;
+}
+
+static void mtk_snand_bm_swap_raw(struct mtk_snand *snf)
+{
+	uint32_t fdm_bbm_pos;
+
+	if (!snf->nfi_soc->bbm_swap || snf->ecc_steps == 1)
+		return;
+
+	fdm_bbm_pos = (snf->ecc_steps - 1) * snf->raw_sector_size +
+		      snf->nfi_soc->sector_size;
+	do_bm_swap(&snf->page_cache[fdm_bbm_pos],
+		   &snf->page_cache[snf->writesize]);
+}
+
+static void mtk_snand_bm_swap(struct mtk_snand *snf)
+{
+	uint32_t buf_bbm_pos, fdm_bbm_pos;
+
+	if (!snf->nfi_soc->bbm_swap || snf->ecc_steps == 1)
+		return;
+
+	buf_bbm_pos = snf->writesize -
+		      (snf->ecc_steps - 1) * snf->spare_per_sector;
+	fdm_bbm_pos = snf->writesize +
+		      (snf->ecc_steps - 1) * snf->nfi_soc->fdm_size;
+	do_bm_swap(&snf->page_cache[fdm_bbm_pos],
+		   &snf->page_cache[buf_bbm_pos]);
+}
+
+static void mtk_snand_fdm_bm_swap_raw(struct mtk_snand *snf)
+{
+	uint32_t fdm_bbm_pos1, fdm_bbm_pos2;
+
+	if (!snf->nfi_soc->bbm_swap || snf->ecc_steps == 1)
+		return;
+
+	fdm_bbm_pos1 = snf->nfi_soc->sector_size;
+	fdm_bbm_pos2 = (snf->ecc_steps - 1) * snf->raw_sector_size +
+		       snf->nfi_soc->sector_size;
+	do_bm_swap(&snf->page_cache[fdm_bbm_pos1],
+		   &snf->page_cache[fdm_bbm_pos2]);
+}
+
+static void mtk_snand_fdm_bm_swap(struct mtk_snand *snf)
+{
+	uint32_t fdm_bbm_pos1, fdm_bbm_pos2;
+
+	if (!snf->nfi_soc->bbm_swap || snf->ecc_steps == 1)
+		return;
+
+	fdm_bbm_pos1 = snf->writesize;
+	fdm_bbm_pos2 = snf->writesize +
+		       (snf->ecc_steps - 1) * snf->nfi_soc->fdm_size;
+	do_bm_swap(&snf->page_cache[fdm_bbm_pos1],
+		   &snf->page_cache[fdm_bbm_pos2]);
+}
+
+static int mtk_nfi_reset(struct mtk_snand *snf)
+{
+	uint32_t val, fifo_mask;
+	int ret;
+
+	nfi_write32(snf, NFI_CON, CON_FIFO_FLUSH | CON_NFI_RST);
+
+	ret = read16_poll_timeout(snf->nfi_base + NFI_MASTERSTA, val,
+				  !(val & snf->nfi_soc->mastersta_mask), 0,
+				  SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "NFI master is still busy after reset\n");
+		return ret;
+	}
+
+	ret = read32_poll_timeout(snf->nfi_base + NFI_STA, val,
+				  !(val & (NFI_FSM | NFI_NAND_FSM)), 0,
+				  SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev, "Failed to reset NFI\n");
+		return ret;
+	}
+
+	fifo_mask = ((snf->nfi_soc->fifo_size - 1) << FIFO_RD_REMAIN_S) |
+		    ((snf->nfi_soc->fifo_size - 1) << FIFO_WR_REMAIN_S);
+	ret = read16_poll_timeout(snf->nfi_base + NFI_FIFOSTA, val,
+				  !(val & fifo_mask), 0, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev, "NFI FIFOs are not empty\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mtk_snand_mac_reset(struct mtk_snand *snf)
+{
+	int ret;
+	uint32_t val;
+
+	nfi_rmw32(snf, SNF_MISC_CTL, 0, SW_RST);
+
+	ret = read32_poll_timeout(snf->nfi_base + SNF_STA_CTL1, val,
+				  !(val & SPI_STATE), 0, SNFI_POLL_INTERVAL);
+	if (ret)
+		snand_log_snfi(snf->pdev, "Failed to reset SNFI MAC\n");
+
+	nfi_write32(snf, SNF_MISC_CTL, (2 << FIFO_RD_LTC_S) |
+		    (10 << CS_DESELECT_CYC_S) | (snf->nfi_soc->latch_lat << LATCH_LAT_S));
+
+	return ret;
+}
+
+static int mtk_snand_mac_trigger(struct mtk_snand *snf, uint32_t outlen,
+				 uint32_t inlen)
+{
+	int ret;
+	uint32_t val;
+
+	nfi_write32(snf, SNF_MAC_CTL, SF_MAC_EN);
+	nfi_write32(snf, SNF_MAC_OUTL, outlen);
+	nfi_write32(snf, SNF_MAC_INL, inlen);
+
+	nfi_write32(snf, SNF_MAC_CTL, SF_MAC_EN | SF_TRIG);
+
+	ret = read32_poll_timeout(snf->nfi_base + SNF_MAC_CTL, val,
+				  val & WIP_READY, 0, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_snfi(snf->pdev, "Timed out waiting for WIP_READY\n");
+		goto cleanup;
+	}
+
+	ret = read32_poll_timeout(snf->nfi_base + SNF_MAC_CTL, val,
+				  !(val & WIP), 0, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_snfi(snf->pdev,
+			       "Timed out waiting for WIP cleared\n");
+	}
+
+cleanup:
+	nfi_write32(snf, SNF_MAC_CTL, 0);
+
+	return ret;
+}
+
+int mtk_snand_mac_io(struct mtk_snand *snf, const uint8_t *out, uint32_t outlen,
+		     uint8_t *in, uint32_t inlen)
+{
+	int ret;
+
+	if (outlen + inlen > SNF_GPRAM_SIZE)
+		return -EINVAL;
+
+	mtk_snand_mac_reset(snf);
+
+	nfi_write_data(snf, SNF_GPRAM, out, outlen);
+
+	ret = mtk_snand_mac_trigger(snf, outlen, inlen);
+	if (ret)
+		return ret;
+
+	if (!inlen)
+		return 0;
+
+	nfi_read_data(snf, SNF_GPRAM + outlen, in, inlen);
+
+	return 0;
+}
+
+static int mtk_snand_get_feature(struct mtk_snand *snf, uint32_t addr)
+{
+	uint8_t op[2], val;
+	int ret;
+
+	op[0] = SNAND_CMD_GET_FEATURE;
+	op[1] = (uint8_t)addr;
+
+	ret = mtk_snand_mac_io(snf, op, sizeof(op), &val, 1);
+	if (ret)
+		return ret;
+
+	return val;
+}
+
+int mtk_snand_set_feature(struct mtk_snand *snf, uint32_t addr, uint32_t val)
+{
+	uint8_t op[3];
+
+	op[0] = SNAND_CMD_SET_FEATURE;
+	op[1] = (uint8_t)addr;
+	op[2] = (uint8_t)val;
+
+	return mtk_snand_mac_io(snf, op, sizeof(op), NULL, 0);
+}
+
+static int mtk_snand_poll_status(struct mtk_snand *snf, uint32_t wait_us)
+{
+	int val;
+	mtk_snand_time_t time_start, tmo;
+
+	time_start = timer_get_ticks();
+	tmo = timer_time_to_tick(wait_us);
+
+	do {
+		val = mtk_snand_get_feature(snf, SNAND_FEATURE_STATUS_ADDR);
+		if (!(val & SNAND_STATUS_OIP))
+			return val & (SNAND_STATUS_ERASE_FAIL |
+				      SNAND_STATUS_PROGRAM_FAIL);
+	} while (!timer_is_timeout(time_start, tmo));
+
+	return -ETIMEDOUT;
+}
+
+int mtk_snand_chip_reset(struct mtk_snand *snf)
+{
+	uint8_t op = SNAND_CMD_RESET;
+	int ret;
+
+	ret = mtk_snand_mac_io(snf, &op, 1, NULL, 0);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_poll_status(snf, SNFI_POLL_INTERVAL);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int mtk_snand_config_feature(struct mtk_snand *snf, uint8_t clr,
+				    uint8_t set)
+{
+	int val, newval;
+	int ret;
+
+	val = mtk_snand_get_feature(snf, SNAND_FEATURE_CONFIG_ADDR);
+	if (val < 0) {
+		snand_log_chip(snf->pdev,
+			       "Failed to get configuration feature\n");
+		return val;
+	}
+
+	newval = (val & (~clr)) | set;
+
+	if (newval == val)
+		return 0;
+
+	ret = mtk_snand_set_feature(snf, SNAND_FEATURE_CONFIG_ADDR,
+				    (uint8_t)newval);
+	if (val < 0) {
+		snand_log_chip(snf->pdev,
+			       "Failed to set configuration feature\n");
+		return ret;
+	}
+
+	val = mtk_snand_get_feature(snf, SNAND_FEATURE_CONFIG_ADDR);
+	if (val < 0) {
+		snand_log_chip(snf->pdev,
+			       "Failed to get configuration feature\n");
+		return val;
+	}
+
+	if (newval != val)
+		return -ENOTSUPP;
+
+	return 0;
+}
+
+static int mtk_snand_ondie_ecc_control(struct mtk_snand *snf, bool enable)
+{
+	int ret;
+
+	if (enable)
+		ret = mtk_snand_config_feature(snf, 0, SNAND_FEATURE_ECC_EN);
+	else
+		ret = mtk_snand_config_feature(snf, SNAND_FEATURE_ECC_EN, 0);
+
+	if (ret) {
+		snand_log_chip(snf->pdev, "Failed to %s On-Die ECC engine\n",
+			       enable ? "enable" : "disable");
+	}
+
+	return ret;
+}
+
+static int mtk_snand_qspi_control(struct mtk_snand *snf, bool enable)
+{
+	int ret;
+
+	if (enable) {
+		ret = mtk_snand_config_feature(snf, 0,
+					       SNAND_FEATURE_QUAD_ENABLE);
+	} else {
+		ret = mtk_snand_config_feature(snf,
+					       SNAND_FEATURE_QUAD_ENABLE, 0);
+	}
+
+	if (ret) {
+		snand_log_chip(snf->pdev, "Failed to %s quad spi\n",
+			       enable ? "enable" : "disable");
+	}
+
+	return ret;
+}
+
+static int mtk_snand_unlock(struct mtk_snand *snf)
+{
+	int ret;
+
+	ret = mtk_snand_set_feature(snf, SNAND_FEATURE_PROTECT_ADDR, 0);
+	if (ret) {
+		snand_log_chip(snf->pdev, "Failed to set protection feature\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mtk_snand_write_enable(struct mtk_snand *snf)
+{
+	uint8_t op = SNAND_CMD_WRITE_ENABLE;
+	int ret, val;
+
+	ret = mtk_snand_mac_io(snf, &op, 1, NULL, 0);
+	if (ret)
+		return ret;
+
+	val = mtk_snand_get_feature(snf, SNAND_FEATURE_STATUS_ADDR);
+	if (val < 0)
+		return ret;
+
+	if (val & SNAND_STATUS_WEL)
+		return 0;
+
+	snand_log_chip(snf->pdev, "Failed to send write-enable command\n");
+
+	return -ENOTSUPP;
+}
+
+static int mtk_snand_select_die(struct mtk_snand *snf, uint32_t dieidx)
+{
+	if (!snf->select_die)
+		return 0;
+
+	return snf->select_die(snf, dieidx);
+}
+
+static uint64_t mtk_snand_select_die_address(struct mtk_snand *snf,
+					     uint64_t addr)
+{
+	uint32_t dieidx;
+
+	if (!snf->select_die)
+		return addr;
+
+	dieidx = addr >> snf->die_shift;
+
+	mtk_snand_select_die(snf, dieidx);
+
+	return addr & snf->die_mask;
+}
+
+static uint32_t mtk_snand_get_plane_address(struct mtk_snand *snf,
+					    uint32_t page)
+{
+	uint32_t pages_per_block;
+
+	pages_per_block = 1 << (snf->erasesize_shift - snf->writesize_shift);
+
+	if (page & pages_per_block)
+		return 1 << (snf->writesize_shift + 1);
+
+	return 0;
+}
+
+static int mtk_snand_page_op(struct mtk_snand *snf, uint32_t page, uint8_t cmd)
+{
+	uint8_t op[4];
+
+	op[0] = cmd;
+	op[1] = (page >> 16) & 0xff;
+	op[2] = (page >> 8) & 0xff;
+	op[3] = page & 0xff;
+
+	return mtk_snand_mac_io(snf, op, sizeof(op), NULL, 0);
+}
+
+static void mtk_snand_read_fdm(struct mtk_snand *snf, uint8_t *buf)
+{
+	uint32_t vall, valm;
+	uint8_t *oobptr = buf;
+	int i, j;
+
+	for (i = 0; i < snf->ecc_steps; i++) {
+		vall = nfi_read32(snf, NFI_FDML(i));
+		valm = nfi_read32(snf, NFI_FDMM(i));
+
+		for (j = 0; j < snf->nfi_soc->fdm_size; j++)
+			oobptr[j] = (j >= 4 ? valm : vall) >> ((j % 4) * 8);
+
+		oobptr += snf->nfi_soc->fdm_size;
+	}
+}
+
+static int mtk_snand_read_ecc_parity(struct mtk_snand *snf, uint32_t page,
+				     uint32_t sect, uint8_t *oob)
+{
+	uint32_t ecc_bytes = snf->spare_per_sector - snf->nfi_soc->fdm_size;
+	uint32_t coladdr, raw_offs, offs;
+	uint8_t op[4];
+
+	if (sizeof(op) + ecc_bytes > SNF_GPRAM_SIZE) {
+		snand_log_snfi(snf->pdev,
+			       "ECC parity size does not fit the GPRAM\n");
+		return -ENOTSUPP;
+	}
+
+	raw_offs = sect * snf->raw_sector_size + snf->nfi_soc->sector_size +
+		   snf->nfi_soc->fdm_size;
+	offs = snf->ecc_steps * snf->nfi_soc->fdm_size + sect * ecc_bytes;
+
+	/* Column address with plane bit */
+	coladdr = raw_offs | mtk_snand_get_plane_address(snf, page);
+
+	op[0] = SNAND_CMD_READ_FROM_CACHE;
+	op[1] = (coladdr >> 8) & 0xff;
+	op[2] = coladdr & 0xff;
+	op[3] = 0;
+
+	return mtk_snand_mac_io(snf, op, sizeof(op), oob + offs, ecc_bytes);
+}
+
+static int mtk_snand_check_ecc_result(struct mtk_snand *snf, uint32_t page)
+{
+	uint8_t *oob = snf->page_cache + snf->writesize;
+	int i, rc, ret = 0, max_bitflips = 0;
+
+	for (i = 0; i < snf->ecc_steps; i++) {
+		if (snf->sect_bf[i] >= 0) {
+			if (snf->sect_bf[i] > max_bitflips)
+				max_bitflips = snf->sect_bf[i];
+			continue;
+		}
+
+		rc = mtk_snand_read_ecc_parity(snf, page, i, oob);
+		if (rc)
+			return rc;
+
+		rc = mtk_ecc_fixup_empty_sector(snf, i);
+		if (rc < 0) {
+			ret = -EBADMSG;
+
+			snand_log_ecc(snf->pdev,
+			      "Uncorrectable bitflips in page %u sect %u\n",
+			      page, i);
+		} else if (rc) {
+			snf->sect_bf[i] = rc;
+
+			if (snf->sect_bf[i] > max_bitflips)
+				max_bitflips = snf->sect_bf[i];
+
+			snand_log_ecc(snf->pdev,
+			      "%u bitflip%s corrected in page %u sect %u\n",
+			      rc, rc > 1 ? "s" : "", page, i);
+		} else {
+			snf->sect_bf[i] = 0;
+		}
+	}
+
+	return ret ? ret : max_bitflips;
+}
+
+static int mtk_snand_read_cache(struct mtk_snand *snf, uint32_t page, bool raw)
+{
+	uint32_t coladdr, rwbytes, mode, len, val;
+	uintptr_t dma_addr;
+	int ret;
+
+	/* Column address with plane bit */
+	coladdr = mtk_snand_get_plane_address(snf, page);
+
+	mtk_snand_mac_reset(snf);
+	mtk_nfi_reset(snf);
+
+	/* Command and dummy cycles */
+	nfi_write32(snf, SNF_RD_CTL2,
+		    ((uint32_t)snf->dummy_rfc << DATA_READ_DUMMY_S) |
+		    (snf->opcode_rfc << DATA_READ_CMD_S));
+
+	/* Column address */
+	nfi_write32(snf, SNF_RD_CTL3, coladdr);
+
+	/* Set read mode */
+	mode = (uint32_t)snf->mode_rfc << DATA_READ_MODE_S;
+	nfi_rmw32(snf, SNF_MISC_CTL, DATA_READ_MODE,
+			mode | DATARD_CUSTOM_EN | (snf->nfi_soc->latch_lat << LATCH_LAT_S));
+
+	/* Set bytes to read */
+	rwbytes = snf->ecc_steps * snf->raw_sector_size;
+	nfi_write32(snf, SNF_MISC_CTL2, (rwbytes << PROGRAM_LOAD_BYTE_NUM_S) |
+		    rwbytes);
+
+	/* NFI read prepare */
+	mode = raw ? 0 : CNFG_HW_ECC_EN | CNFG_AUTO_FMT_EN;
+	nfi_write16(snf, NFI_CNFG, (CNFG_OP_MODE_CUST << CNFG_OP_MODE_S) |
+		    CNFG_DMA_BURST_EN | CNFG_READ_MODE | CNFG_DMA_MODE | mode);
+
+	nfi_write32(snf, NFI_CON, (snf->ecc_steps << CON_SEC_NUM_S));
+
+	/* Prepare for DMA read */
+	len = snf->writesize + snf->oobsize;
+	ret = dma_mem_map(snf->pdev, snf->page_cache, &dma_addr, len, false);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "DMA map from device failed with %d\n", ret);
+		return ret;
+	}
+
+	nfi_write32(snf, NFI_STRADDR, (uint32_t)dma_addr);
+
+	if (!raw)
+		mtk_snand_ecc_decoder_start(snf);
+
+	/* Prepare for custom read interrupt */
+	nfi_write32(snf, NFI_INTR_EN, NFI_IRQ_INTR_EN | NFI_IRQ_CUS_READ);
+	irq_completion_init(snf->pdev);
+
+	/* Trigger NFI into custom mode */
+	nfi_write16(snf, NFI_CMD, NFI_CMD_DUMMY_READ);
+
+	/* Start DMA read */
+	nfi_rmw32(snf, NFI_CON, 0, CON_BRD);
+	nfi_write16(snf, NFI_STRDATA, STR_DATA);
+
+	/* Wait for operation finished */
+	ret = irq_completion_wait(snf->pdev, snf->nfi_base + SNF_STA_CTL1,
+				  CUS_READ_DONE, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "DMA timed out for reading from cache\n");
+		goto cleanup;
+	}
+
+	/* Wait for BUS_SEC_CNTR returning expected value */
+	ret = read32_poll_timeout(snf->nfi_base + NFI_BYTELEN, val,
+				  BUS_SEC_CNTR(val) >= snf->ecc_steps,
+				  0, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "Timed out waiting for BUS_SEC_CNTR\n");
+		goto cleanup;
+	}
+
+	/* Wait for bus becoming idle */
+	ret = read32_poll_timeout(snf->nfi_base + NFI_MASTERSTA, val,
+				  !(val & snf->nfi_soc->mastersta_mask),
+				  0, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "Timed out waiting for bus becoming idle\n");
+		goto cleanup;
+	}
+
+	if (!raw) {
+		ret = mtk_ecc_wait_decoder_done(snf);
+		if (ret)
+			goto cleanup;
+
+		mtk_snand_read_fdm(snf, snf->page_cache + snf->writesize);
+
+		mtk_ecc_check_decode_error(snf);
+		mtk_snand_ecc_decoder_stop(snf);
+
+		ret = mtk_snand_check_ecc_result(snf, page);
+	}
+
+cleanup:
+	/* DMA cleanup */
+	dma_mem_unmap(snf->pdev, dma_addr, len, false);
+
+	/* Stop read */
+	nfi_write32(snf, NFI_CON, 0);
+	nfi_write16(snf, NFI_CNFG, 0);
+
+	/* Clear SNF done flag */
+	nfi_rmw32(snf, SNF_STA_CTL1, 0, CUS_READ_DONE);
+	nfi_write32(snf, SNF_STA_CTL1, 0);
+
+	/* Disable interrupt */
+	nfi_read32(snf, NFI_INTR_STA);
+	nfi_write32(snf, NFI_INTR_EN, 0);
+
+	nfi_rmw32(snf, SNF_MISC_CTL, DATARD_CUSTOM_EN | LATCH_LAT, 0);
+
+	return ret;
+}
+
+static void mtk_snand_from_raw_page(struct mtk_snand *snf, void *buf, void *oob)
+{
+	uint32_t i, ecc_bytes = snf->spare_per_sector - snf->nfi_soc->fdm_size;
+	uint8_t *eccptr = oob + snf->ecc_steps * snf->nfi_soc->fdm_size;
+	uint8_t *bufptr = buf, *oobptr = oob, *raw_sector;
+
+	for (i = 0; i < snf->ecc_steps; i++) {
+		raw_sector = snf->page_cache + i * snf->raw_sector_size;
+
+		if (buf) {
+			memcpy(bufptr, raw_sector, snf->nfi_soc->sector_size);
+			bufptr += snf->nfi_soc->sector_size;
+		}
+
+		raw_sector += snf->nfi_soc->sector_size;
+
+		if (oob) {
+			memcpy(oobptr, raw_sector, snf->nfi_soc->fdm_size);
+			oobptr += snf->nfi_soc->fdm_size;
+			raw_sector += snf->nfi_soc->fdm_size;
+
+			memcpy(eccptr, raw_sector, ecc_bytes);
+			eccptr += ecc_bytes;
+		}
+	}
+}
+
+static int mtk_snand_do_read_page(struct mtk_snand *snf, uint64_t addr,
+				  void *buf, void *oob, bool raw, bool format)
+{
+	uint64_t die_addr;
+	uint32_t page, dly_ctrl3;
+	int ret, retry_cnt = 0;
+
+	die_addr = mtk_snand_select_die_address(snf, addr);
+	page = die_addr >> snf->writesize_shift;
+
+	dly_ctrl3 = nfi_read32(snf, SNF_DLY_CTL3);
+
+	ret = mtk_snand_page_op(snf, page, SNAND_CMD_READ_TO_CACHE);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_poll_status(snf, SNFI_POLL_INTERVAL);
+	if (ret < 0) {
+		snand_log_chip(snf->pdev, "Read to cache command timed out\n");
+		return ret;
+	}
+
+retry:
+	ret = mtk_snand_read_cache(snf, page, raw);
+	if (ret < 0 && ret != -EBADMSG)
+		return ret;
+
+	if (ret == -EBADMSG && retry_cnt < 16) {
+		nfi_write32(snf, SNF_DLY_CTL3, retry_cnt * 2);
+		retry_cnt++;
+		goto retry;
+	}
+
+	if (retry_cnt) {
+		if(ret == -EBADMSG) {
+			nfi_write32(snf, SNF_DLY_CTL3, dly_ctrl3);
+			snand_log_chip(snf->pdev,
+				       "NFI calibration failed. Original sample delay: 0x%x\n",
+				       dly_ctrl3);
+		} else {
+			snand_log_chip(snf->pdev,
+				       "NFI calibration passed. New sample delay: 0x%x\n",
+				       nfi_read32(snf, SNF_DLY_CTL3));
+		}
+	}
+
+	if (raw) {
+		if (format) {
+			mtk_snand_bm_swap_raw(snf);
+			mtk_snand_fdm_bm_swap_raw(snf);
+			mtk_snand_from_raw_page(snf, buf, oob);
+		} else {
+			if (buf)
+				memcpy(buf, snf->page_cache, snf->writesize);
+
+			if (oob) {
+				memset(oob, 0xff, snf->oobsize);
+				memcpy(oob, snf->page_cache + snf->writesize,
+				       snf->ecc_steps * snf->spare_per_sector);
+			}
+		}
+	} else {
+		mtk_snand_bm_swap(snf);
+		mtk_snand_fdm_bm_swap(snf);
+
+		if (buf)
+			memcpy(buf, snf->page_cache, snf->writesize);
+
+		if (oob) {
+			memset(oob, 0xff, snf->oobsize);
+			memcpy(oob, snf->page_cache + snf->writesize,
+			       snf->ecc_steps * snf->nfi_soc->fdm_size);
+		}
+	}
+
+	return ret;
+}
+
+int mtk_snand_read_page(struct mtk_snand *snf, uint64_t addr, void *buf,
+			void *oob, bool raw)
+{
+	if (!snf || (!buf && !oob))
+		return -EINVAL;
+
+	if (addr >= snf->size)
+		return -EINVAL;
+
+	return mtk_snand_do_read_page(snf, addr, buf, oob, raw, true);
+}
+
+static void mtk_snand_write_fdm(struct mtk_snand *snf, const uint8_t *buf)
+{
+	uint32_t vall, valm, fdm_size = snf->nfi_soc->fdm_size;
+	const uint8_t *oobptr = buf;
+	int i, j;
+
+	for (i = 0; i < snf->ecc_steps; i++) {
+		vall = 0;
+		valm = 0;
+
+		for (j = 0; j < 8; j++) {
+			if (j < 4)
+				vall |= (j < fdm_size ? oobptr[j] : 0xff)
+						<< (j * 8);
+			else
+				valm |= (j < fdm_size ? oobptr[j] : 0xff)
+						<< ((j - 4) * 8);
+		}
+
+		nfi_write32(snf, NFI_FDML(i), vall);
+		nfi_write32(snf, NFI_FDMM(i), valm);
+
+		oobptr += fdm_size;
+	}
+}
+
+static int mtk_snand_program_load(struct mtk_snand *snf, uint32_t page,
+				  bool raw)
+{
+	uint32_t coladdr, rwbytes, mode, len, val;
+	uintptr_t dma_addr;
+	int ret;
+
+	/* Column address with plane bit */
+	coladdr = mtk_snand_get_plane_address(snf, page);
+
+	mtk_snand_mac_reset(snf);
+	mtk_nfi_reset(snf);
+
+	/* Write FDM registers if necessary */
+	if (!raw)
+		mtk_snand_write_fdm(snf, snf->page_cache + snf->writesize);
+
+	/* Command */
+	nfi_write32(snf, SNF_PG_CTL1, (snf->opcode_pl << PG_LOAD_CMD_S));
+
+	/* Column address */
+	nfi_write32(snf, SNF_PG_CTL2, coladdr);
+
+	/* Set write mode */
+	mode = snf->mode_pl ? PG_LOAD_X4_EN : 0;
+	nfi_rmw32(snf, SNF_MISC_CTL, PG_LOAD_X4_EN, mode | PG_LOAD_CUSTOM_EN);
+
+	/* Set bytes to write */
+	rwbytes = snf->ecc_steps * snf->raw_sector_size;
+	nfi_write32(snf, SNF_MISC_CTL2, (rwbytes << PROGRAM_LOAD_BYTE_NUM_S) |
+		    rwbytes);
+
+	/* NFI write prepare */
+	mode = raw ? 0 : CNFG_HW_ECC_EN | CNFG_AUTO_FMT_EN;
+	nfi_write16(snf, NFI_CNFG, (CNFG_OP_MODE_PROGRAM << CNFG_OP_MODE_S) |
+		    CNFG_DMA_BURST_EN | CNFG_DMA_MODE | mode);
+
+	nfi_write32(snf, NFI_CON, (snf->ecc_steps << CON_SEC_NUM_S));
+
+	/* Prepare for DMA write */
+	len = snf->writesize + snf->oobsize;
+	ret = dma_mem_map(snf->pdev, snf->page_cache, &dma_addr, len, true);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "DMA map to device failed with %d\n", ret);
+		return ret;
+	}
+
+	nfi_write32(snf, NFI_STRADDR, (uint32_t)dma_addr);
+
+	if (!raw)
+		mtk_snand_ecc_encoder_start(snf);
+
+	/* Prepare for custom write interrupt */
+	nfi_write32(snf, NFI_INTR_EN, NFI_IRQ_INTR_EN | NFI_IRQ_CUS_PG);
+	irq_completion_init(snf->pdev);
+
+	/* Trigger NFI into custom mode */
+	nfi_write16(snf, NFI_CMD, NFI_CMD_DUMMY_WRITE);
+
+	/* Start DMA write */
+	nfi_rmw32(snf, NFI_CON, 0, CON_BWR);
+	nfi_write16(snf, NFI_STRDATA, STR_DATA);
+
+	/* Wait for operation finished */
+	ret = irq_completion_wait(snf->pdev, snf->nfi_base + SNF_STA_CTL1,
+				  CUS_PG_DONE, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "DMA timed out for program load\n");
+		goto cleanup;
+	}
+
+	/* Wait for NFI_SEC_CNTR returning expected value */
+	ret = read32_poll_timeout(snf->nfi_base + NFI_ADDRCNTR, val,
+				  NFI_SEC_CNTR(val) >= snf->ecc_steps,
+				  0, SNFI_POLL_INTERVAL);
+	if (ret) {
+		snand_log_nfi(snf->pdev,
+			      "Timed out waiting for BUS_SEC_CNTR\n");
+		goto cleanup;
+	}
+
+	if (!raw)
+		mtk_snand_ecc_encoder_stop(snf);
+
+cleanup:
+	/* DMA cleanup */
+	dma_mem_unmap(snf->pdev, dma_addr, len, true);
+
+	/* Stop write */
+	nfi_write32(snf, NFI_CON, 0);
+	nfi_write16(snf, NFI_CNFG, 0);
+
+	/* Clear SNF done flag */
+	nfi_rmw32(snf, SNF_STA_CTL1, 0, CUS_PG_DONE);
+	nfi_write32(snf, SNF_STA_CTL1, 0);
+
+	/* Disable interrupt */
+	nfi_read32(snf, NFI_INTR_STA);
+	nfi_write32(snf, NFI_INTR_EN, 0);
+
+	nfi_rmw32(snf, SNF_MISC_CTL, PG_LOAD_CUSTOM_EN, 0);
+
+	return ret;
+}
+
+static void mtk_snand_to_raw_page(struct mtk_snand *snf,
+				  const void *buf, const void *oob,
+				  bool empty_ecc)
+{
+	uint32_t i, ecc_bytes = snf->spare_per_sector - snf->nfi_soc->fdm_size;
+	const uint8_t *eccptr = oob + snf->ecc_steps * snf->nfi_soc->fdm_size;
+	const uint8_t *bufptr = buf, *oobptr = oob;
+	uint8_t *raw_sector;
+
+	memset(snf->page_cache, 0xff, snf->writesize + snf->oobsize);
+	for (i = 0; i < snf->ecc_steps; i++) {
+		raw_sector = snf->page_cache + i * snf->raw_sector_size;
+
+		if (buf) {
+			memcpy(raw_sector, bufptr, snf->nfi_soc->sector_size);
+			bufptr += snf->nfi_soc->sector_size;
+		}
+
+		raw_sector += snf->nfi_soc->sector_size;
+
+		if (oob) {
+			memcpy(raw_sector, oobptr, snf->nfi_soc->fdm_size);
+			oobptr += snf->nfi_soc->fdm_size;
+			raw_sector += snf->nfi_soc->fdm_size;
+
+			if (empty_ecc)
+				memset(raw_sector, 0xff, ecc_bytes);
+			else
+				memcpy(raw_sector, eccptr, ecc_bytes);
+			eccptr += ecc_bytes;
+		}
+	}
+}
+
+static bool mtk_snand_is_empty_page(struct mtk_snand *snf, const void *buf,
+				    const void *oob)
+{
+	const uint8_t *p = buf;
+	uint32_t i, j;
+
+	if (buf) {
+		for (i = 0; i < snf->writesize; i++) {
+			if (p[i] != 0xff)
+				return false;
+		}
+	}
+
+	if (oob) {
+		for (j = 0; j < snf->ecc_steps; j++) {
+			p = oob + j * snf->nfi_soc->fdm_size;
+
+			for (i = 0; i < snf->nfi_soc->fdm_ecc_size; i++) {
+				if (p[i] != 0xff)
+					return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+static int mtk_snand_do_write_page(struct mtk_snand *snf, uint64_t addr,
+				   const void *buf, const void *oob,
+				   bool raw, bool format)
+{
+	uint64_t die_addr;
+	bool empty_ecc = false;
+	uint32_t page;
+	int ret;
+
+	die_addr = mtk_snand_select_die_address(snf, addr);
+	page = die_addr >> snf->writesize_shift;
+
+	if (!raw && mtk_snand_is_empty_page(snf, buf, oob)) {
+		/*
+		 * If the data in the page to be ecc-ed is full 0xff,
+		 * change to raw write mode
+		 */
+		raw = true;
+		format = true;
+
+		/* fill ecc parity code region with 0xff */
+		empty_ecc = true;
+	}
+
+	if (raw) {
+		if (format) {
+			mtk_snand_to_raw_page(snf, buf, oob, empty_ecc);
+			mtk_snand_fdm_bm_swap_raw(snf);
+			mtk_snand_bm_swap_raw(snf);
+		} else {
+			memset(snf->page_cache, 0xff,
+			       snf->writesize + snf->oobsize);
+
+			if (buf)
+				memcpy(snf->page_cache, buf, snf->writesize);
+
+			if (oob) {
+				memcpy(snf->page_cache + snf->writesize, oob,
+				       snf->ecc_steps * snf->spare_per_sector);
+			}
+		}
+	} else {
+		memset(snf->page_cache, 0xff, snf->writesize + snf->oobsize);
+		if (buf)
+			memcpy(snf->page_cache, buf, snf->writesize);
+
+		if (oob) {
+			memcpy(snf->page_cache + snf->writesize, oob,
+			       snf->ecc_steps * snf->nfi_soc->fdm_size);
+		}
+
+		mtk_snand_fdm_bm_swap(snf);
+		mtk_snand_bm_swap(snf);
+	}
+
+	ret = mtk_snand_write_enable(snf);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_program_load(snf, page, raw);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_page_op(snf, page, SNAND_CMD_PROGRAM_EXECUTE);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_poll_status(snf, SNFI_POLL_INTERVAL);
+	if (ret < 0) {
+		snand_log_chip(snf->pdev,
+			       "Page program command timed out on page %u\n",
+			       page);
+		return ret;
+	}
+
+	if (ret & SNAND_STATUS_PROGRAM_FAIL) {
+		snand_log_chip(snf->pdev,
+			       "Page program failed on page %u\n", page);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int mtk_snand_write_page(struct mtk_snand *snf, uint64_t addr, const void *buf,
+			 const void *oob, bool raw)
+{
+	if (!snf || (!buf && !oob))
+		return -EINVAL;
+
+	if (addr >= snf->size)
+		return -EINVAL;
+
+	return mtk_snand_do_write_page(snf, addr, buf, oob, raw, true);
+}
+
+int mtk_snand_erase_block(struct mtk_snand *snf, uint64_t addr)
+{
+	uint64_t die_addr;
+	uint32_t page, block;
+	int ret;
+
+	if (!snf)
+		return -EINVAL;
+
+	if (addr >= snf->size)
+		return -EINVAL;
+
+	die_addr = mtk_snand_select_die_address(snf, addr);
+	block = die_addr >> snf->erasesize_shift;
+	page = block << (snf->erasesize_shift - snf->writesize_shift);
+
+	ret = mtk_snand_write_enable(snf);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_page_op(snf, page, SNAND_CMD_BLOCK_ERASE);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_poll_status(snf, SNFI_POLL_INTERVAL);
+	if (ret < 0) {
+		snand_log_chip(snf->pdev,
+			       "Block erase command timed out on block %u\n",
+			       block);
+		return ret;
+	}
+
+	if (ret & SNAND_STATUS_ERASE_FAIL) {
+		snand_log_chip(snf->pdev,
+			       "Block erase failed on block %u\n", block);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int mtk_snand_block_isbad_std(struct mtk_snand *snf, uint64_t addr)
+{
+	int ret;
+
+	ret = mtk_snand_do_read_page(snf, addr, NULL, snf->buf_cache, true,
+				     false);
+	if (ret && ret != -EBADMSG)
+		return ret;
+
+	return snf->buf_cache[0] != 0xff;
+}
+
+static int mtk_snand_block_isbad_mtk(struct mtk_snand *snf, uint64_t addr)
+{
+	int ret;
+
+	ret = mtk_snand_do_read_page(snf, addr, NULL, snf->buf_cache, true,
+				     true);
+	if (ret && ret != -EBADMSG)
+		return ret;
+
+	return snf->buf_cache[0] != 0xff;
+}
+
+int mtk_snand_block_isbad(struct mtk_snand *snf, uint64_t addr)
+{
+	if (!snf)
+		return -EINVAL;
+
+	if (addr >= snf->size)
+		return -EINVAL;
+
+	addr &= ~snf->erasesize_mask;
+
+	if (snf->nfi_soc->bbm_swap)
+		return mtk_snand_block_isbad_std(snf, addr);
+
+	return mtk_snand_block_isbad_mtk(snf, addr);
+}
+
+static int mtk_snand_block_markbad_std(struct mtk_snand *snf, uint64_t addr)
+{
+	/* Standard BBM position */
+	memset(snf->buf_cache, 0xff, snf->oobsize);
+	snf->buf_cache[0] = 0;
+
+	return mtk_snand_do_write_page(snf, addr, NULL, snf->buf_cache, true,
+				       false);
+}
+
+static int mtk_snand_block_markbad_mtk(struct mtk_snand *snf, uint64_t addr)
+{
+	/* Write the whole page with zeros */
+	memset(snf->buf_cache, 0, snf->writesize + snf->oobsize);
+
+	return mtk_snand_do_write_page(snf, addr, snf->buf_cache,
+				       snf->buf_cache + snf->writesize, true,
+				       true);
+}
+
+int mtk_snand_block_markbad(struct mtk_snand *snf, uint64_t addr)
+{
+	if (!snf)
+		return -EINVAL;
+
+	if (addr >= snf->size)
+		return -EINVAL;
+
+	addr &= ~snf->erasesize_mask;
+
+	if (snf->nfi_soc->bbm_swap)
+		return mtk_snand_block_markbad_std(snf, addr);
+
+	return mtk_snand_block_markbad_mtk(snf, addr);
+}
+
+int mtk_snand_fill_oob(struct mtk_snand *snf, uint8_t *oobraw,
+		       const uint8_t *oobbuf, size_t ooblen)
+{
+	size_t len = ooblen, sect_fdm_len;
+	const uint8_t *oob = oobbuf;
+	uint32_t step = 0;
+
+	if (!snf || !oobraw || !oob)
+		return -EINVAL;
+
+	while (len && step < snf->ecc_steps) {
+		sect_fdm_len = snf->nfi_soc->fdm_size - 1;
+		if (sect_fdm_len > len)
+			sect_fdm_len = len;
+
+		memcpy(oobraw + step * snf->nfi_soc->fdm_size + 1, oob,
+		       sect_fdm_len);
+
+		len -= sect_fdm_len;
+		oob += sect_fdm_len;
+		step++;
+	}
+
+	return len;
+}
+
+int mtk_snand_transfer_oob(struct mtk_snand *snf, uint8_t *oobbuf,
+			   size_t ooblen, const uint8_t *oobraw)
+{
+	size_t len = ooblen, sect_fdm_len;
+	uint8_t *oob = oobbuf;
+	uint32_t step = 0;
+
+	if (!snf || !oobraw || !oob)
+		return -EINVAL;
+
+	while (len && step < snf->ecc_steps) {
+		sect_fdm_len = snf->nfi_soc->fdm_size - 1;
+		if (sect_fdm_len > len)
+			sect_fdm_len = len;
+
+		memcpy(oob, oobraw + step * snf->nfi_soc->fdm_size + 1,
+		       sect_fdm_len);
+
+		len -= sect_fdm_len;
+		oob += sect_fdm_len;
+		step++;
+	}
+
+	return len;
+}
+
+int mtk_snand_read_page_auto_oob(struct mtk_snand *snf, uint64_t addr,
+				 void *buf, void *oob, size_t ooblen,
+				 size_t *actualooblen, bool raw)
+{
+	int ret, oobremain;
+
+	if (!snf)
+		return -EINVAL;
+
+	if (!oob)
+		return mtk_snand_read_page(snf, addr, buf, NULL, raw);
+
+	ret = mtk_snand_read_page(snf, addr, buf, snf->buf_cache, raw);
+	if (ret && ret != -EBADMSG) {
+		if (actualooblen)
+			*actualooblen = 0;
+		return ret;
+	}
+
+	oobremain = mtk_snand_transfer_oob(snf, oob, ooblen, snf->buf_cache);
+	if (actualooblen)
+		*actualooblen = ooblen - oobremain;
+
+	return ret;
+}
+
+int mtk_snand_write_page_auto_oob(struct mtk_snand *snf, uint64_t addr,
+				  const void *buf, const void *oob,
+				  size_t ooblen, size_t *actualooblen, bool raw)
+{
+	int oobremain;
+
+	if (!snf)
+		return -EINVAL;
+
+	if (!oob)
+		return mtk_snand_write_page(snf, addr, buf, NULL, raw);
+
+	memset(snf->buf_cache, 0xff, snf->oobsize);
+	oobremain = mtk_snand_fill_oob(snf, snf->buf_cache, oob, ooblen);
+	if (actualooblen)
+		*actualooblen = ooblen - oobremain;
+
+	return mtk_snand_write_page(snf, addr, buf, snf->buf_cache, raw);
+}
+
+int mtk_snand_get_chip_info(struct mtk_snand *snf,
+			    struct mtk_snand_chip_info *info)
+{
+	if (!snf || !info)
+		return -EINVAL;
+
+	info->model = snf->model;
+	info->chipsize = snf->size;
+	info->blocksize = snf->erasesize;
+	info->pagesize = snf->writesize;
+	info->sparesize = snf->oobsize;
+	info->spare_per_sector = snf->spare_per_sector;
+	info->fdm_size = snf->nfi_soc->fdm_size;
+	info->fdm_ecc_size = snf->nfi_soc->fdm_ecc_size;
+	info->num_sectors = snf->ecc_steps;
+	info->sector_size = snf->nfi_soc->sector_size;
+	info->ecc_strength = snf->ecc_strength;
+	info->ecc_bytes = snf->ecc_bytes;
+
+	return 0;
+}
+
+int mtk_snand_irq_process(struct mtk_snand *snf)
+{
+	uint32_t sta, ien;
+
+	if (!snf)
+		return -EINVAL;
+
+	sta = nfi_read32(snf, NFI_INTR_STA);
+	ien = nfi_read32(snf, NFI_INTR_EN);
+
+	if (!(sta & ien))
+		return 0;
+
+	nfi_write32(snf, NFI_INTR_EN, 0);
+	irq_completion_done(snf->pdev);
+
+	return 1;
+}
+
+static int mtk_snand_select_spare_per_sector(struct mtk_snand *snf)
+{
+	uint32_t spare_per_step = snf->oobsize / snf->ecc_steps;
+	int i, mul = 1;
+
+	/*
+	 * If we're using the 1KB sector size, HW will automatically
+	 * double the spare size. So we should only use half of the value.
+	 */
+	if (snf->nfi_soc->sector_size == 1024)
+		mul = 2;
+
+	spare_per_step /= mul;
+
+	for (i = snf->nfi_soc->num_spare_size - 1; i >= 0; i--) {
+		if (snf->nfi_soc->spare_sizes[i] <= spare_per_step) {
+			snf->spare_per_sector = snf->nfi_soc->spare_sizes[i];
+			snf->spare_per_sector *= mul;
+			return i;
+		}
+	}
+
+	snand_log_nfi(snf->pdev,
+		      "Page size %u+%u is not supported\n", snf->writesize,
+		      snf->oobsize);
+
+	return -1;
+}
+
+static int mtk_snand_pagefmt_setup(struct mtk_snand *snf)
+{
+	uint32_t spare_size_idx, spare_size_shift, pagesize_idx;
+	uint32_t sector_size_512;
+
+	if (snf->nfi_soc->sector_size == 512) {
+		sector_size_512 = NFI_SEC_SEL_512;
+		spare_size_shift = NFI_SPARE_SIZE_S;
+	} else {
+		sector_size_512 = 0;
+		spare_size_shift = NFI_SPARE_SIZE_LS_S;
+	}
+
+	switch (snf->writesize) {
+	case SZ_512:
+		pagesize_idx = NFI_PAGE_SIZE_512_2K;
+		break;
+	case SZ_2K:
+		if (snf->nfi_soc->sector_size == 512)
+			pagesize_idx = NFI_PAGE_SIZE_2K_4K;
+		else
+			pagesize_idx = NFI_PAGE_SIZE_512_2K;
+		break;
+	case SZ_4K:
+		if (snf->nfi_soc->sector_size == 512)
+			pagesize_idx = NFI_PAGE_SIZE_4K_8K;
+		else
+			pagesize_idx = NFI_PAGE_SIZE_2K_4K;
+		break;
+	case SZ_8K:
+		if (snf->nfi_soc->sector_size == 512)
+			pagesize_idx = NFI_PAGE_SIZE_8K_16K;
+		else
+			pagesize_idx = NFI_PAGE_SIZE_4K_8K;
+		break;
+	case SZ_16K:
+		pagesize_idx = NFI_PAGE_SIZE_8K_16K;
+		break;
+	default:
+		snand_log_nfi(snf->pdev, "Page size %u is not supported\n",
+			      snf->writesize);
+		return -ENOTSUPP;
+	}
+
+	spare_size_idx = mtk_snand_select_spare_per_sector(snf);
+	if (unlikely(spare_size_idx < 0))
+		return -ENOTSUPP;
+
+	snf->raw_sector_size = snf->nfi_soc->sector_size +
+			       snf->spare_per_sector;
+
+	/* Setup page format */
+	nfi_write32(snf, NFI_PAGEFMT,
+		    (snf->nfi_soc->fdm_ecc_size << NFI_FDM_ECC_NUM_S) |
+		    (snf->nfi_soc->fdm_size << NFI_FDM_NUM_S) |
+		    (spare_size_idx << spare_size_shift) |
+		    (pagesize_idx << NFI_PAGE_SIZE_S) |
+		    sector_size_512);
+
+	return 0;
+}
+
+static enum snand_flash_io mtk_snand_select_opcode(struct mtk_snand *snf,
+				   uint32_t snfi_caps, uint8_t *opcode,
+				   uint8_t *dummy,
+				   const struct snand_io_cap *op_cap)
+{
+	uint32_t i, caps;
+
+	caps = snfi_caps & op_cap->caps;
+
+	i = fls(caps);
+	if (i > 0) {
+		*opcode = op_cap->opcodes[i - 1].opcode;
+		if (dummy)
+			*dummy = op_cap->opcodes[i - 1].dummy;
+		return i - 1;
+	}
+
+	return __SNAND_IO_MAX;
+}
+
+static int mtk_snand_select_opcode_rfc(struct mtk_snand *snf,
+				       uint32_t snfi_caps,
+				       const struct snand_io_cap *op_cap)
+{
+	enum snand_flash_io idx;
+
+	static const uint8_t rfc_modes[__SNAND_IO_MAX] = {
+		[SNAND_IO_1_1_1] = DATA_READ_MODE_X1,
+		[SNAND_IO_1_1_2] = DATA_READ_MODE_X2,
+		[SNAND_IO_1_2_2] = DATA_READ_MODE_DUAL,
+		[SNAND_IO_1_1_4] = DATA_READ_MODE_X4,
+		[SNAND_IO_1_4_4] = DATA_READ_MODE_QUAD,
+	};
+
+	idx = mtk_snand_select_opcode(snf, snfi_caps, &snf->opcode_rfc,
+				      &snf->dummy_rfc, op_cap);
+	if (idx >= __SNAND_IO_MAX) {
+		snand_log_snfi(snf->pdev,
+			       "No capable opcode for read from cache\n");
+		return -ENOTSUPP;
+	}
+
+	snf->mode_rfc = rfc_modes[idx];
+
+	if (idx == SNAND_IO_1_1_4 || idx == SNAND_IO_1_4_4)
+		snf->quad_spi_op = true;
+
+	return 0;
+}
+
+static int mtk_snand_select_opcode_pl(struct mtk_snand *snf, uint32_t snfi_caps,
+				      const struct snand_io_cap *op_cap)
+{
+	enum snand_flash_io idx;
+
+	static const uint8_t pl_modes[__SNAND_IO_MAX] = {
+		[SNAND_IO_1_1_1] = 0,
+		[SNAND_IO_1_1_4] = 1,
+	};
+
+	idx = mtk_snand_select_opcode(snf, snfi_caps, &snf->opcode_pl,
+				      NULL, op_cap);
+	if (idx >= __SNAND_IO_MAX) {
+		snand_log_snfi(snf->pdev,
+			       "No capable opcode for program load\n");
+		return -ENOTSUPP;
+	}
+
+	snf->mode_pl = pl_modes[idx];
+
+	if (idx == SNAND_IO_1_1_4)
+		snf->quad_spi_op = true;
+
+	return 0;
+}
+
+static int mtk_snand_setup(struct mtk_snand *snf,
+			   const struct snand_flash_info *snand_info)
+{
+	const struct snand_mem_org *memorg = &snand_info->memorg;
+	uint32_t i, msg_size, snfi_caps;
+	int ret;
+
+	/* Calculate flash memory organization */
+	snf->model = snand_info->model;
+	snf->writesize = memorg->pagesize;
+	snf->oobsize = memorg->sparesize;
+	snf->erasesize = snf->writesize * memorg->pages_per_block;
+	snf->die_size = (uint64_t)snf->erasesize * memorg->blocks_per_die;
+	snf->size = snf->die_size * memorg->ndies;
+	snf->num_dies = memorg->ndies;
+
+	snf->writesize_mask = snf->writesize - 1;
+	snf->erasesize_mask = snf->erasesize - 1;
+	snf->die_mask = snf->die_size - 1;
+
+	snf->writesize_shift = ffs(snf->writesize) - 1;
+	snf->erasesize_shift = ffs(snf->erasesize) - 1;
+	snf->die_shift = mtk_snand_ffs64(snf->die_size) - 1;
+
+	snf->select_die = snand_info->select_die;
+
+	/* Determine opcodes for read from cache/program load */
+	snfi_caps = SPI_IO_1_1_1 | SPI_IO_1_1_2 | SPI_IO_1_2_2;
+	if (snf->snfi_quad_spi)
+		snfi_caps |= SPI_IO_1_1_4 | SPI_IO_1_4_4;
+
+	ret = mtk_snand_select_opcode_rfc(snf, snfi_caps, snand_info->cap_rd);
+	if (ret)
+		return ret;
+
+	ret = mtk_snand_select_opcode_pl(snf, snfi_caps, snand_info->cap_pl);
+	if (ret)
+		return ret;
+
+	/* ECC and page format */
+	snf->ecc_steps = snf->writesize / snf->nfi_soc->sector_size;
+	if (snf->ecc_steps > snf->nfi_soc->max_sectors) {
+		snand_log_nfi(snf->pdev, "Page size %u is not supported\n",
+			      snf->writesize);
+		return -ENOTSUPP;
+	}
+
+	ret = mtk_snand_pagefmt_setup(snf);
+	if (ret)
+		return ret;
+
+	msg_size = snf->nfi_soc->sector_size + snf->nfi_soc->fdm_ecc_size;
+	ret = mtk_ecc_setup(snf, snf->nfi_base + NFI_FDM0L,
+			    snf->spare_per_sector - snf->nfi_soc->fdm_size,
+			    msg_size);
+	if (ret)
+		return ret;
+
+	nfi_write16(snf, NFI_CNFG, 0);
+
+	/* Tuning options */
+	nfi_write16(snf, NFI_DEBUG_CON1, WBUF_EN);
+	nfi_write32(snf, SNF_DLY_CTL3, (snf->nfi_soc->sample_delay << SFCK_SAM_DLY_S));
+
+	/* Interrupts */
+	nfi_read32(snf, NFI_INTR_STA);
+	nfi_write32(snf, NFI_INTR_EN, 0);
+
+	/* Clear SNF done flag */
+	nfi_rmw32(snf, SNF_STA_CTL1, 0, CUS_READ_DONE | CUS_PG_DONE);
+	nfi_write32(snf, SNF_STA_CTL1, 0);
+
+	/* Initialization on all dies */
+	for (i = 0; i < snf->num_dies; i++) {
+		mtk_snand_select_die(snf, i);
+
+		/* Disable On-Die ECC engine */
+		ret = mtk_snand_ondie_ecc_control(snf, false);
+		if (ret)
+			return ret;
+
+		/* Disable block protection */
+		mtk_snand_unlock(snf);
+
+		/* Enable/disable quad-spi */
+		mtk_snand_qspi_control(snf, snf->quad_spi_op);
+	}
+
+	mtk_snand_select_die(snf, 0);
+
+	return 0;
+}
+
+static int mtk_snand_id_probe(struct mtk_snand *snf,
+			      const struct snand_flash_info **snand_info)
+{
+	uint8_t id[4], op[2];
+	int ret;
+
+	/* Read SPI-NAND JEDEC ID, OP + dummy/addr + ID */
+	op[0] = SNAND_CMD_READID;
+	op[1] = 0;
+	ret = mtk_snand_mac_io(snf, op, 2, id, sizeof(id));
+	if (ret)
+		return ret;
+
+	*snand_info = snand_flash_id_lookup(SNAND_ID_DYMMY, id);
+	if (*snand_info)
+		return 0;
+
+	/* Read SPI-NAND JEDEC ID, OP + ID */
+	op[0] = SNAND_CMD_READID;
+	ret = mtk_snand_mac_io(snf, op, 1, id, sizeof(id));
+	if (ret)
+		return ret;
+
+	*snand_info = snand_flash_id_lookup(SNAND_ID_DYMMY, id);
+	if (*snand_info)
+		return 0;
+
+	snand_log_chip(snf->pdev,
+		       "Unrecognized SPI-NAND ID: %02x %02x %02x %02x\n",
+		       id[0], id[1], id[2], id[3]);
+
+	return -EINVAL;
+}
+
+int mtk_snand_init(void *dev, const struct mtk_snand_platdata *pdata,
+		   struct mtk_snand **psnf)
+{
+	const struct snand_flash_info *snand_info;
+	uint32_t rawpage_size, sect_bf_size;
+	struct mtk_snand tmpsnf, *snf;
+	int ret;
+
+	if (!pdata || !psnf)
+		return -EINVAL;
+
+	if (pdata->soc >= __SNAND_SOC_MAX) {
+		snand_log_chip(dev, "Invalid SOC %u for MTK-SNAND\n",
+			       pdata->soc);
+		return -EINVAL;
+	}
+
+	/* Dummy instance only for initial reset and id probe */
+	tmpsnf.nfi_base = pdata->nfi_base;
+	tmpsnf.ecc_base = pdata->ecc_base;
+	tmpsnf.soc = pdata->soc;
+	tmpsnf.nfi_soc = &mtk_snand_socs[pdata->soc];
+	tmpsnf.pdev = dev;
+
+	/* Switch to SNFI mode */
+	writel(SPI_MODE, tmpsnf.nfi_base + SNF_CFG);
+
+	/* Reset SNFI & NFI */
+	mtk_snand_mac_reset(&tmpsnf);
+	mtk_nfi_reset(&tmpsnf);
+
+	/* Reset SPI-NAND chip */
+	ret = mtk_snand_chip_reset(&tmpsnf);
+	if (ret) {
+		snand_log_chip(dev, "Failed to reset SPI-NAND chip\n");
+		return ret;
+	}
+
+	/* Probe SPI-NAND flash by JEDEC ID */
+	ret = mtk_snand_id_probe(&tmpsnf, &snand_info);
+	if (ret)
+		return ret;
+
+	rawpage_size = snand_info->memorg.pagesize +
+		       snand_info->memorg.sparesize;
+
+	sect_bf_size = mtk_snand_socs[pdata->soc].max_sectors *
+		       sizeof(*snf->sect_bf);
+
+	/* Allocate memory for instance and cache */
+	snf = generic_mem_alloc(dev,
+				sizeof(*snf) + rawpage_size + sect_bf_size);
+	if (!snf) {
+		snand_log_chip(dev, "Failed to allocate memory for instance\n");
+		return -ENOMEM;
+	}
+
+	snf->sect_bf = (int *)((uintptr_t)snf + sizeof(*snf));
+	snf->buf_cache = (uint8_t *)((uintptr_t)snf->sect_bf + sect_bf_size);
+
+	/* Allocate memory for DMA buffer */
+	snf->page_cache = dma_mem_alloc(dev, rawpage_size);
+	if (!snf->page_cache) {
+		generic_mem_free(dev, snf);
+		snand_log_chip(dev,
+			       "Failed to allocate memory for DMA buffer\n");
+		return -ENOMEM;
+	}
+
+	/* Fill up instance */
+	snf->pdev = dev;
+	snf->nfi_base = pdata->nfi_base;
+	snf->ecc_base = pdata->ecc_base;
+	snf->soc = pdata->soc;
+	snf->nfi_soc = &mtk_snand_socs[pdata->soc];
+	snf->snfi_quad_spi = pdata->quad_spi;
+
+	/* Initialize SNFI & ECC engine */
+	ret = mtk_snand_setup(snf, snand_info);
+	if (ret) {
+		dma_mem_free(dev, snf->page_cache);
+		generic_mem_free(dev, snf);
+		return ret;
+	}
+
+	*psnf = snf;
+
+	return 0;
+}
+
+int mtk_snand_cleanup(struct mtk_snand *snf)
+{
+	if (!snf)
+		return 0;
+
+	dma_mem_free(snf->pdev, snf->page_cache);
+	generic_mem_free(snf->pdev, snf);
+
+	return 0;
+}
--- /dev/null
+++ b/drivers/mtd/mtk-snand/mtk-snand.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[email protected]>
+ */
+
+#ifndef _MTK_SNAND_H_
+#define _MTK_SNAND_H_
+
+#ifndef PRIVATE_MTK_SNAND_HEADER
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#endif
+
+enum mtk_snand_soc {
+	SNAND_SOC_MT7622,
+	SNAND_SOC_MT7629,
+	SNAND_SOC_MT7981,
+	SNAND_SOC_MT7986,
+	__SNAND_SOC_MAX
+};
+
+struct mtk_snand_platdata {
+	void *nfi_base;
+	void *ecc_base;
+	enum mtk_snand_soc soc;
+	bool quad_spi;
+};
+
+struct mtk_snand_chip_info {
+	const char *model;
+	uint64_t chipsize;
+	uint32_t blocksize;
+	uint32_t pagesize;
+	uint32_t sparesize;
+	uint32_t spare_per_sector;
+	uint32_t fdm_size;
+	uint32_t fdm_ecc_size;
+	uint32_t num_sectors;
+	uint32_t sector_size;
+	uint32_t ecc_strength;
+	uint32_t ecc_bytes;
+};
+
+struct mtk_snand;
+struct snand_flash_info;
+
+int mtk_snand_init(void *dev, const struct mtk_snand_platdata *pdata,
+		   struct mtk_snand **psnf);
+int mtk_snand_cleanup(struct mtk_snand *snf);
+
+int mtk_snand_chip_reset(struct mtk_snand *snf);
+int mtk_snand_read_page(struct mtk_snand *snf, uint64_t addr, void *buf,
+			void *oob, bool raw);
+int mtk_snand_write_page(struct mtk_snand *snf, uint64_t addr, const void *buf,
+			 const void *oob, bool raw);
+int mtk_snand_erase_block(struct mtk_snand *snf, uint64_t addr);
+int mtk_snand_block_isbad(struct mtk_snand *snf, uint64_t addr);
+int mtk_snand_block_markbad(struct mtk_snand *snf, uint64_t addr);
+int mtk_snand_fill_oob(struct mtk_snand *snf, uint8_t *oobraw,
+		       const uint8_t *oobbuf, size_t ooblen);
+int mtk_snand_transfer_oob(struct mtk_snand *snf, uint8_t *oobbuf,
+			   size_t ooblen, const uint8_t *oobraw);
+int mtk_snand_read_page_auto_oob(struct mtk_snand *snf, uint64_t addr,
+				 void *buf, void *oob, size_t ooblen,
+				 size_t *actualooblen, bool raw);
+int mtk_snand_write_page_auto_oob(struct mtk_snand *snf, uint64_t addr,
+				  const void *buf, const void *oob,
+				  size_t ooblen, size_t *actualooblen,
+				  bool raw);
+int mtk_snand_get_chip_info(struct mtk_snand *snf,
+			    struct mtk_snand_chip_info *info);
+int mtk_snand_irq_process(struct mtk_snand *snf);
+
+#endif /* _MTK_SNAND_H_ */