From a97e38f34b59d18d9ca3626c2611c63cc6c6b48a Mon Sep 17 00:00:00 2001
From: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Date: Wed, 2 Mar 2016 12:00:12 -0500
Subject: [PATCH 58/91] mtd: mediatek: driver for MTK Smart Device Gen1 NAND

This patch adds support for mediatek's SDG1 NFC nand controller
embedded in SoC 2701.

UBIFS support has been successfully tested.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
---
 drivers/mtd/nand/Kconfig            |    6 +
 drivers/mtd/nand/Makefile           |    1 +
 drivers/mtd/nand/mtksdg1_nand.c     | 1535 +++++++++++++++++++++++++++++++++++
 drivers/mtd/nand/mtksdg1_nand_ecc.h |   75 ++
 drivers/mtd/nand/mtksdg1_nand_nfi.h |  119 +++
 5 files changed, 1736 insertions(+)
 create mode 100644 drivers/mtd/nand/mtksdg1_nand.c
 create mode 100644 drivers/mtd/nand/mtksdg1_nand_ecc.h
 create mode 100644 drivers/mtd/nand/mtksdg1_nand_nfi.h

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 2896640..5ec072a 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -546,4 +546,10 @@ config MTD_NAND_HISI504
 	help
 	  Enables support for NAND controller on Hisilicon SoC Hip04.
 
+config MTD_NAND_MTKSDG1
+	tristate "Support for NAND controller on MTK Smart Device SoCs"
+	depends on HAS_DMA
+	help
+	Enables support for NAND controller on MTK Smart Device SoCs.
+
 endif # MTD_NAND
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 2c7f014..2a2620c 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -55,5 +55,6 @@ obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)	+= bcm47xxnflash/
 obj-$(CONFIG_MTD_NAND_SUNXI)		+= sunxi_nand.o
 obj-$(CONFIG_MTD_NAND_HISI504)	        += hisi504_nand.o
 obj-$(CONFIG_MTD_NAND_BRCMNAND)		+= brcmnand/
+obj-$(CONFIG_MTD_NAND_MTKSDG1)		+= mtksdg1_nand.o
 
 nand-objs := nand_base.o nand_bbt.o nand_timings.o
diff --git a/drivers/mtd/nand/mtksdg1_nand.c b/drivers/mtd/nand/mtksdg1_nand.c
new file mode 100644
index 0000000..55dd17d
--- /dev/null
+++ b/drivers/mtd/nand/mtksdg1_nand.c
@@ -0,0 +1,1535 @@
+/*
+ * MTK smart device NAND Flash controller driver.
+ * Copyright (C) 2015-2016 MediaTek Inc.
+ * Authors:	Xiaolei Li		<xiaolei.li@mediatek.com>
+ *		Jorge Ramirez-Ortiz	<jorge.ramirez-ortiz@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/of_mtd.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/module.h>
+
+#include "mtksdg1_nand_nfi.h"
+#include "mtksdg1_nand_ecc.h"
+
+#define MTK_IRQ_ECC		"mtksdg1-nand-ecc"
+#define MTK_IRQ_NFI		"mtksdg1-nand-nfi"
+#define MTK_NAME		"mtksdg1-nand"
+
+#define KB(x)			((x) * 1024UL)
+#define MB(x)			(KB(x) * 1024UL)
+
+#define SECTOR_SHIFT		(10)
+#define SECTOR_SIZE		(1UL << SECTOR_SHIFT)
+#define BYTES_TO_SECTORS(x)	((x) >> SECTOR_SHIFT)
+#define SECTORS_TO_BYTES(x)	((x) << SECTOR_SHIFT)
+
+#define MTK_TIMEOUT		(500)
+#define MTK_RESET_TIMEOUT	(1 * HZ)
+
+#define MTK_ECC_PARITY_BITS	(14)
+#define MTK_NAND_MAX_CHIP	(2)
+
+#define MTK_OOB_ON		(1)
+#define MTK_OOB_OFF		(0)
+
+/* raw accesses do not use ECC (ecc = !raw) */
+#define MTK_ECC_OFF		(1)
+#define MTK_ECC_ON		(0)
+
+struct mtk_nfc_clk {
+	struct clk *nfiecc_clk;
+	struct clk *nfi_clk;
+	struct clk *pad_clk;
+};
+
+struct mtk_nfc_saved_reg {
+	struct {
+		u32 enccnfg;
+		u32 deccnfg;
+	} ecc;
+	struct {
+		u32 emp_thresh;
+		u16 pagefmt;
+		u32 acccon;
+		u16 cnrnb;
+		u16 csel;
+	} nfi;
+};
+
+struct mtk_nfc_host {
+	struct mtk_nfc_clk clk;
+	struct nand_chip chip;
+	struct device *dev;
+
+	struct {
+		struct completion complete;
+		void __iomem *base;
+	} nfi;
+
+	struct {
+		struct completion complete;
+		void __iomem *base;
+		u32 dec_sec;
+	} ecc;
+
+	u32 fdm_reg[MTKSDG1_NFI_FDM_REG_SIZE / sizeof(u32)];
+	bool switch_oob;
+	u32 row_nob;
+	u8 *buffer;
+
+#ifdef CONFIG_PM_SLEEP
+	struct mtk_nfc_saved_reg saved_reg;
+#endif
+};
+
+static struct nand_ecclayout nand_2k_64 = {
+	.oobfree = { {0, 16} },
+};
+
+static struct nand_ecclayout nand_4k_128 = {
+	.oobfree = { {0, 32} },
+};
+
+/* NFI register access */
+static inline void mtk_nfi_writel(struct mtk_nfc_host *host, u32 val, u32 reg)
+{
+	writel(val, host->nfi.base + reg);
+}
+static inline void mtk_nfi_writew(struct mtk_nfc_host *host, u16 val, u32 reg)
+{
+	writew(val, host->nfi.base + reg);
+}
+static inline u32 mtk_nfi_readl(struct mtk_nfc_host *host, u32 reg)
+{
+	return readl_relaxed(host->nfi.base + reg);
+}
+static inline u16 mtk_nfi_readw(struct mtk_nfc_host *host, u32 reg)
+{
+	return readw_relaxed(host->nfi.base + reg);
+}
+static inline u8 mtk_nfi_readb(struct mtk_nfc_host *host, u32 reg)
+{
+	return readb_relaxed(host->nfi.base + reg);
+}
+
+/* ECC register access */
+static inline void mtk_ecc_writel(struct mtk_nfc_host *host, u32 val, u32 reg)
+{
+	writel(val, host->ecc.base + reg);
+}
+static inline void mtk_ecc_writew(struct mtk_nfc_host *host, u16 val, u32 reg)
+{
+	writew(val, host->ecc.base + reg);
+}
+static inline u32 mtk_ecc_readl(struct mtk_nfc_host *host, u32 reg)
+{
+	return readl_relaxed(host->ecc.base + reg);
+}
+static inline u16 mtk_ecc_readw(struct mtk_nfc_host *host, u32 reg)
+{
+	return readw_relaxed(host->ecc.base + reg);
+}
+
+static void mtk_nfc_hw_reset(struct mtk_nfc_host *host)
+{
+	unsigned long timeout = MTK_RESET_TIMEOUT;
+	struct device *dev = host->dev;
+	u32 val;
+
+	/* reset the state machine, data fifo and fdm data */
+	mtk_nfi_writel(host, CON_FIFO_FLUSH | CON_NFI_RST, MTKSDG1_NFI_CON);
+	timeout += jiffies;
+	do {
+		val = mtk_nfi_readl(host, MTKSDG1_NFI_MASTER_STA);
+		val &= MASTER_STA_MASK;
+		if (!val)
+			return;
+		usleep_range(50, 100);
+
+	} while (time_before(jiffies, timeout));
+
+	dev_warn(dev, "nfi master active after in reset [0x%x] = 0x%x\n",
+		MTKSDG1_NFI_MASTER_STA, val);
+};
+
+static int mtk_nfc_set_command(struct mtk_nfc_host *host, u8 command)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	struct device *dev = host->dev;
+	u32 val;
+
+	mtk_nfi_writel(host, command, MTKSDG1_NFI_CMD);
+
+	/* wait for the NFI core to enter command mode */
+	timeout += jiffies;
+	do {
+		val = mtk_nfi_readl(host, MTKSDG1_NFI_STA);
+		val &= STA_CMD;
+		if (!val)
+			return 0;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+	dev_warn(dev, "nfi core timed out entering command mode\n");
+
+	return -EIO;
+}
+
+static int mtk_nfc_set_address(struct mtk_nfc_host *host, u32 column, u32 row,
+		u8 colnob, u8 row_nob)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	struct device *dev = host->dev;
+	u32 addr_nob, val;
+
+	addr_nob = colnob | (row_nob << ADDR_ROW_NOB_SHIFT);
+	mtk_nfi_writel(host, column, MTKSDG1_NFI_COLADDR);
+	mtk_nfi_writel(host, row, MTKSDG1_NFI_ROWADDR);
+	mtk_nfi_writel(host, addr_nob, MTKSDG1_NFI_ADDRNOB);
+
+	/* wait for the NFI core to enter address mode */
+	timeout += jiffies;
+	do {
+		val = mtk_nfi_readl(host, MTKSDG1_NFI_STA);
+		val &= STA_ADDR;
+		if (!val)
+			return 0;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+
+	dev_warn(dev, "nfi core timed out entering address mode\n");
+
+	return -EIO;
+}
+
+static inline void mtk_ecc_encoder_idle(struct mtk_nfc_host *host)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	struct device *dev = host->dev;
+	u32 val;
+
+	timeout += jiffies;
+	do {
+		val = mtk_ecc_readl(host, MTKSDG1_ECC_ENCIDLE);
+		val &= ENC_IDLE;
+		if (val)
+			return;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+
+	dev_warn(dev, "hw init ecc encoder not idle\n");
+}
+
+static inline void mtk_ecc_decoder_idle(struct mtk_nfc_host *host)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	struct device *dev = host->dev;
+	u32 val;
+
+	timeout += jiffies;
+	do {
+		val = mtk_ecc_readw(host, MTKSDG1_ECC_DECIDLE);
+		val &= DEC_IDLE;
+		if (val)
+			return;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+
+	dev_warn(dev, "hw init ecc decoder not idle\n");
+}
+
+static int mtk_nfc_transfer_done(struct mtk_nfc_host *host, u32 sectors)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	u32 cnt;
+
+	/* wait for the sector count */
+	timeout += jiffies;
+	do {
+		cnt = mtk_nfi_readl(host, MTKSDG1_NFI_ADDRCNTR);
+		cnt &= CNTR_MASK;
+		if (cnt >= sectors)
+			return 0;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+
+	return  -EIO;
+}
+
+static int mtk_nfc_subpage_done(struct mtk_nfc_host *host, int sectors)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	u32 val;
+
+	timeout += jiffies;
+	do {
+		val = mtk_nfi_readl(host, MTKSDG1_NFI_BYTELEN);
+		val &= CNTR_MASK;
+		if (val >= sectors)
+			return 0;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+
+	return -EIO;
+}
+
+static inline int mtk_nfc_data_ready(struct mtk_nfc_host *host)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	u8 val;
+
+	timeout += jiffies;
+	do {
+		val = mtk_nfi_readw(host, MTKSDG1_NFI_PIO_DIRDY);
+		val &= PIO_DI_RDY;
+		if (val)
+			return 0;
+		cpu_relax();
+
+	} while (time_before(jiffies, timeout));
+
+	/* data _MUST_ not be accessed */
+	return -EIO;
+}
+
+static int mtk_nfc_hw_runtime_config(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	struct device *dev = host->dev;
+	u32 dec_size, enc_size;
+	u32 ecc_bit, ecc_level;
+	u32 spare, fmt;
+	u32 reg;
+
+	host->row_nob = 1;
+	if (chip->chipsize > MB(32))
+		host->row_nob = chip->chipsize > MB(128) ? 3 : 2;
+
+	spare = mtd->oobsize / BYTES_TO_SECTORS(mtd->writesize);
+	switch (spare) {
+	case 16:
+		ecc_bit = ECC_CNFG_4BIT;
+		ecc_level = 4;
+		break;
+	case 32:
+		ecc_bit = ECC_CNFG_12BIT;
+		ecc_level = 12;
+		break;
+	default:
+		dev_err(dev, "invalid spare size per sector: %d\n", spare);
+		return -EINVAL;
+	}
+
+	chip->ecc.strength = ecc_level;
+	chip->ecc.size = SECTOR_SIZE;
+
+	switch (mtd->writesize) {
+	case KB(2):
+		fmt = PAGEFMT_512_2K;
+		chip->ecc.layout = &nand_2k_64;
+		break;
+	case KB(4):
+		fmt = PAGEFMT_2K_4K;
+		chip->ecc.layout = &nand_4k_128;
+		break;
+	case KB(8):
+		fmt = PAGEFMT_4K_8K;
+		break;
+	default:
+		dev_err(dev, "invalid page size: %d\n", mtd->writesize);
+		return -EINVAL;
+	}
+
+	/* configure PAGE FMT */
+	reg = fmt;
+	reg |= PAGEFMT_SPARE_16 << PAGEFMT_SPARE_SHIFT;
+	reg |= MTKSDG1_NFI_FDM_REG_SIZE << PAGEFMT_FDM_SHIFT;
+	reg |= MTKSDG1_NFI_FDM_REG_SIZE << PAGEFMT_FDM_ECC_SHIFT;
+	mtk_nfi_writew(host, reg, MTKSDG1_NFI_PAGEFMT);
+
+	/* configure ECC encoder (in bits) */
+	enc_size = (SECTOR_SIZE + MTKSDG1_NFI_FDM_REG_SIZE) << 3;
+	reg = ecc_bit | ECC_NFI_MODE | (enc_size << ECC_MS_SHIFT);
+	mtk_ecc_writel(host, reg, MTKSDG1_ECC_ENCCNFG);
+
+	/* configure ECC decoder (inbits) */
+	dec_size = enc_size + ecc_level * MTK_ECC_PARITY_BITS;
+	reg = ecc_bit | ECC_NFI_MODE | (dec_size << ECC_MS_SHIFT);
+	reg |= (DEC_CNFG_CORRECT | DEC_EMPTY_EN);
+	mtk_ecc_writel(host, reg, MTKSDG1_ECC_DECCNFG);
+
+	return 0;
+}
+
+static void mtk_nfc_device_reset(struct mtk_nfc_host *host)
+{
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	struct device *dev = host->dev;
+	u16 chip;
+	int rc;
+
+	mtk_nfc_hw_reset(host);
+
+	/* enable reset done interrupt */
+	mtk_nfi_writew(host, INTR_RST_DONE_EN, MTKSDG1_NFI_INTR_EN);
+
+	/* configure FSM for reset operation */
+	mtk_nfi_writew(host, CNFG_OP_RESET, MTKSDG1_NFI_CNFG);
+
+	init_completion(&host->nfi.complete);
+
+	mtk_nfc_set_command(host, NAND_CMD_RESET);
+	rc = wait_for_completion_timeout(&host->nfi.complete, timeout);
+	if (!rc) {
+		chip = mtk_nfi_readw(host, MTKSDG1_NFI_CSEL);
+		dev_err(dev, "device(%d) reset timeout\n", chip);
+	}
+}
+
+static void mtk_nfc_select_chip(struct mtd_info *mtd, int chip)
+{
+	struct nand_chip *nand = mtd_to_nand(mtd);
+	struct mtk_nfc_host *host = nand_get_controller_data(nand);
+
+	if (chip < 0)
+		return;
+
+	mtk_nfi_writel(host, chip, MTKSDG1_NFI_CSEL);
+}
+
+static inline bool mtk_nfc_cmd_supported(unsigned command)
+{
+	switch (command) {
+	case NAND_CMD_RESET:
+	case NAND_CMD_READID:
+	case NAND_CMD_STATUS:
+	case NAND_CMD_READOOB:
+	case NAND_CMD_ERASE1:
+	case NAND_CMD_ERASE2:
+	case NAND_CMD_SEQIN:
+	case NAND_CMD_PAGEPROG:
+	case NAND_CMD_CACHEDPROG:
+	case NAND_CMD_READ0:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static void mtk_nfc_cmdfunc(struct mtd_info *mtd, unsigned command, int column,
+		int page_addr)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(mtd_to_nand(mtd));
+	unsigned long const cmd_timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	struct completion *p = &host->nfi.complete;
+	u32 val;
+	int rc;
+
+	if (mtk_nfc_cmd_supported(command))
+		mtk_nfc_hw_reset(host);
+
+	switch (command) {
+	case NAND_CMD_RESET:
+		mtk_nfc_device_reset(host);
+		break;
+	case NAND_CMD_READID:
+		val = CNFG_READ_EN | CNFG_BYTE_RW | CNFG_OP_SRD;
+		mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+		mtk_nfc_set_command(host, NAND_CMD_READID);
+		mtk_nfc_set_address(host, column, 0, 1, 0);
+		mtk_nfi_writel(host, CON_SRD, MTKSDG1_NFI_CON);
+		break;
+	case NAND_CMD_STATUS:
+		val = CNFG_READ_EN | CNFG_BYTE_RW | CNFG_OP_SRD;
+		mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+		mtk_nfc_set_command(host, NAND_CMD_STATUS);
+		mtk_nfi_writel(host, CON_SRD, MTKSDG1_NFI_CON);
+		break;
+	case NAND_CMD_READOOB:
+		val = CNFG_READ_EN | CNFG_BYTE_RW | CNFG_OP_READ;
+		mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+		mtk_nfc_set_command(host, NAND_CMD_READ0);
+		column += mtd->writesize;
+		mtk_nfc_set_address(host, column, page_addr, 2, host->row_nob);
+		val = CON_BRD | (1 << CON_SEC_SHIFT);
+		mtk_nfi_writel(host, val, MTKSDG1_NFI_CON);
+		break;
+	case NAND_CMD_ERASE1:
+		mtk_nfi_writew(host, INTR_ERS_DONE_EN, MTKSDG1_NFI_INTR_EN);
+		mtk_nfi_writew(host, CNFG_OP_ERASE, MTKSDG1_NFI_CNFG);
+		mtk_nfc_set_command(host, NAND_CMD_ERASE1);
+		mtk_nfc_set_address(host, 0, page_addr, 0, host->row_nob);
+		break;
+	case NAND_CMD_ERASE2:
+		init_completion(p);
+		mtk_nfc_set_command(host, NAND_CMD_ERASE2);
+		rc = wait_for_completion_timeout(p, cmd_timeout);
+		if (!rc)
+			dev_err(host->dev, "erase command timeout\n");
+		break;
+	case NAND_CMD_SEQIN:
+		mtk_nfi_writew(host, CNFG_OP_PRGM, MTKSDG1_NFI_CNFG);
+		mtk_nfc_set_command(host, NAND_CMD_SEQIN);
+		mtk_nfc_set_address(host, column, page_addr, 2, host->row_nob);
+		break;
+	case NAND_CMD_PAGEPROG:
+	case NAND_CMD_CACHEDPROG:
+		mtk_nfi_writew(host, INTR_BUSY_RT_EN, MTKSDG1_NFI_INTR_EN);
+		init_completion(p);
+		mtk_nfc_set_command(host, command);
+		rc = wait_for_completion_timeout(p, cmd_timeout);
+		if (!rc)
+			dev_err(host->dev, "pageprogr command timeout\n");
+		break;
+	case NAND_CMD_READ0:
+		val = CNFG_OP_READ | CNFG_READ_EN;
+		mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+		mtk_nfc_set_command(host, NAND_CMD_READ0);
+		break;
+	default:
+		dev_warn(host->dev, "command 0x%x not supported\n", command);
+		break;
+	}
+}
+
+static uint8_t mtk_nfc_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	int rc;
+
+	rc = mtk_nfc_data_ready(host);
+	if (rc < 0) {
+		dev_err(host->dev, "data not ready\n");
+		return NAND_STATUS_FAIL;
+	}
+
+	return mtk_nfi_readb(host, MTKSDG1_NFI_DATAR);
+}
+
+static void mtk_nfc_write_fdm(struct nand_chip *chip, u32 sectors)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	u8 *src, *dst;
+	int i, j, reg;
+
+	for (i = 0; i < sectors ; i++) {
+		/* read FDM from OOB into private area */
+		src = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+		dst = (u8 *)host->fdm_reg;
+		memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+
+		/* write FDM to registers */
+		for (j = 0; j < ARRAY_SIZE(host->fdm_reg); j++) {
+			reg = MTKSDG1_NFI_FDM0L + i * MTKSDG1_NFI_FDM_REG_SIZE;
+			reg += j * sizeof(host->fdm_reg[0]);
+			mtk_nfi_writel(host, host->fdm_reg[j], reg);
+		}
+	}
+}
+
+static int mtk_nfc_write_page(struct mtd_info *mtd,
+			struct nand_chip *chip, const uint8_t *buf,
+			int oob_on, int page, int raw)
+{
+
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	struct completion *nfi = &host->nfi.complete;
+	struct device *dev = host->dev;
+	const bool use_ecc = !raw;
+	void *q = (void *) buf;
+	dma_addr_t dma_addr;
+	size_t dmasize;
+	u32 reg;
+	int ret;
+
+	dmasize = mtd->writesize + (raw ? mtd->oobsize : 0);
+
+	dma_addr = dma_map_single(dev, q, dmasize, DMA_TO_DEVICE);
+	if (dma_mapping_error(host->dev, dma_addr)) {
+		dev_err(host->dev, "dma mapping error\n");
+		return -EINVAL;
+	}
+
+	reg = mtk_nfi_readw(host, MTKSDG1_NFI_CNFG);
+	reg |= CNFG_AHB | CNFG_DMA_BURST_EN;
+	if (use_ecc) {
+		/**
+		 * OOB will be generated
+		 *  - FDM: from register
+		 *  - ECC: from HW
+		 */
+		reg |= CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN;
+		mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+
+		mtk_ecc_encoder_idle(host);
+		mtk_ecc_writew(host, ENC_EN, MTKSDG1_ECC_ENCCON);
+
+		/* write OOB into the FDM registers (OOB area in MTK NAND) */
+		if (oob_on)
+			mtk_nfc_write_fdm(chip, chip->ecc.steps);
+	} else {
+		/* OOB is part of the DMA transfer */
+		mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+	}
+
+	mtk_nfi_writel(host, chip->ecc.steps << CON_SEC_SHIFT, MTKSDG1_NFI_CON);
+	mtk_nfi_writel(host, lower_32_bits(dma_addr), MTKSDG1_NFI_STRADDR);
+	mtk_nfi_writew(host, INTR_AHB_DONE_EN, MTKSDG1_NFI_INTR_EN);
+
+	init_completion(nfi);
+
+	/* start DMA */
+	reg = mtk_nfi_readl(host, MTKSDG1_NFI_CON) | CON_BWR;
+	mtk_nfi_writel(host, reg, MTKSDG1_NFI_CON);
+
+	ret = wait_for_completion_timeout(nfi, msecs_to_jiffies(MTK_TIMEOUT));
+	if (!ret) {
+		dev_err(dev, "program ahb done timeout\n");
+		mtk_nfi_writew(host, 0, MTKSDG1_NFI_INTR_EN);
+		ret = -ETIMEDOUT;
+		goto timeout;
+	}
+
+	ret = mtk_nfc_transfer_done(host, chip->ecc.steps);
+	if (ret < 0)
+		dev_err(dev, "hwecc write timeout\n");
+timeout:
+	dma_unmap_single(host->dev, dma_addr, dmasize, DMA_TO_DEVICE);
+
+	if (use_ecc) {
+		mtk_ecc_encoder_idle(host);
+		mtk_ecc_writew(host, ENC_DE, MTKSDG1_ECC_ENCCON);
+	}
+
+	mtk_nfi_writel(host, 0, MTKSDG1_NFI_CON);
+
+	return ret;
+}
+
+static int mtk_nfc_write_page_hwecc(struct mtd_info *mtd,
+			struct nand_chip *chip, const uint8_t *buf,
+			int oob_on, int page)
+{
+	return mtk_nfc_write_page(mtd, chip, buf, oob_on, page, MTK_ECC_ON);
+}
+
+static int mtk_nfc_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+					const uint8_t *buf, int oob_on, int pg)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	uint8_t *src, *dst;
+	size_t len;
+	u32 i;
+
+	memset(host->buffer, 0xff, mtd->writesize + mtd->oobsize);
+
+	/* MTK internal 4KB page data layout:
+	 * ----------------------------------
+	 * PAGE = 4KB, SECTOR = 1KB, OOB=128B
+	 * page = sector_oob1 + sector_oob2 + sector_oob3 + sector_oob4
+	 * sector_oob = data (1KB) + FDM (8B) + ECC parity (21B) + free (3B)
+	 *
+	 */
+	len = SECTOR_SIZE + mtd->oobsize / chip->ecc.steps;
+
+	for (i = 0; i < chip->ecc.steps; i++) {
+
+		if (buf) {
+			src = (uint8_t *) buf + i * SECTOR_SIZE;
+			dst = host->buffer + i * len;
+			memcpy(dst, src, SECTOR_SIZE);
+		}
+
+		if (oob_on) {
+			src = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+			dst = host->buffer + i * len + SECTOR_SIZE;
+			memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+		}
+	}
+
+	return mtk_nfc_write_page(mtd, chip, host->buffer, MTK_OOB_OFF, pg,
+				MTK_ECC_OFF);
+}
+
+static int mtk_nfc_sector_encode(struct nand_chip *chip, u8 *data)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	struct completion *ecc = &host->ecc.complete;
+	u32 reg, parity_bytes, i;
+	dma_addr_t dma_addr;
+	u32 *parity_region;
+	int rc, ret = 0;
+	size_t dmasize;
+
+	dmasize = SECTOR_SIZE + MTKSDG1_NFI_FDM_REG_SIZE;
+	dma_addr = dma_map_single(host->dev, data, dmasize, DMA_TO_DEVICE);
+	if (dma_mapping_error(host->dev, dma_addr)) {
+		dev_err(host->dev, "dma mapping error\n");
+		return -EINVAL;
+	}
+
+	/* enable the encoder in DMA mode to calculate the ECC bytes  */
+	reg = mtk_ecc_readl(host, MTKSDG1_ECC_ENCCNFG);
+	reg &= (~ECC_ENC_MODE_MASK);
+	reg |= ECC_DMA_MODE;
+	mtk_ecc_writel(host, reg, MTKSDG1_ECC_ENCCNFG);
+
+	mtk_ecc_writel(host, ENC_IRQEN, MTKSDG1_ECC_ENCIRQ_EN);
+	mtk_ecc_writel(host, lower_32_bits(dma_addr), MTKSDG1_ECC_ENCDIADDR);
+
+	init_completion(ecc);
+	mtk_ecc_writew(host, ENC_EN, MTKSDG1_ECC_ENCCON);
+
+	rc = wait_for_completion_timeout(ecc, msecs_to_jiffies(MTK_TIMEOUT));
+	if (!rc) {
+		dev_err(host->dev, "ecc encode done timeout\n");
+		mtk_ecc_writel(host, 0, MTKSDG1_ECC_ENCIRQ_EN);
+		ret = -ETIMEDOUT;
+		goto timeout;
+	}
+
+	mtk_ecc_encoder_idle(host);
+
+	/**
+	 * Program ECC bytes to OOB
+	 *	per sector oob = FDM + ECC + SPARE
+	 */
+
+	parity_region = (u32 *) (data + SECTOR_SIZE + MTKSDG1_NFI_FDM_REG_SIZE);
+	parity_bytes = (chip->ecc.strength * MTK_ECC_PARITY_BITS + 7) >> 3;
+
+	/* write the parity bytes generated by the ECC back to the OOB region */
+	for (i = 0; i < parity_bytes; i += sizeof(u32))
+		*parity_region++ = mtk_ecc_readl(host, MTKSDG1_ECC_ENCPAR0 + i);
+
+timeout:
+
+	dma_unmap_single(host->dev, dma_addr, dmasize, DMA_TO_DEVICE);
+
+	mtk_ecc_writew(host, 0, MTKSDG1_ECC_ENCCON);
+	reg = mtk_ecc_readl(host, MTKSDG1_ECC_ENCCNFG);
+	reg &= (~ECC_ENC_MODE_MASK);
+	reg |= ECC_NFI_MODE;
+	mtk_ecc_writel(host, reg, MTKSDG1_ECC_ENCCNFG);
+
+	return ret;
+}
+
+static int mtk_nfc_write_subpage_hwecc(struct mtd_info *mtd,
+		struct nand_chip *chip, uint32_t offset, uint32_t data_len,
+		const uint8_t *buf, int oob_on, int pg)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	uint8_t *src, *dst;
+	u32 start, end;
+	size_t len;
+	int i, ret;
+
+	start = BYTES_TO_SECTORS(offset);
+	end = BYTES_TO_SECTORS(offset + data_len + SECTOR_SIZE - 1);
+
+	len = SECTOR_SIZE + mtd->oobsize / chip->ecc.steps;
+
+	memset(host->buffer, 0xff, mtd->writesize + mtd->oobsize);
+	for (i = 0; i < chip->ecc.steps; i++) {
+
+		/* write data */
+		src = (uint8_t *) buf + i * SECTOR_SIZE;
+		dst = host->buffer + i * len;
+		memcpy(dst, src, SECTOR_SIZE);
+
+		if (i < start)
+			continue;
+
+		if (i >= end)
+			continue;
+
+		/* write fdm */
+		if (oob_on) {
+			src = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+			dst = host->buffer + i * len + SECTOR_SIZE;
+			memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+		}
+
+		/* point to the start of data */
+		src = host->buffer + i * len;
+
+		/* program the CRC back to the OOB */
+		ret = mtk_nfc_sector_encode(chip, src);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* use the data in the private buffer (now with FDM and CRC) to perform
+	 * a raw write
+	 */
+	src = host->buffer;
+	return mtk_nfc_write_page(mtd, chip, src, MTK_OOB_OFF, pg, MTK_ECC_OFF);
+}
+
+static int mtk_nfc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
+				int page)
+{
+	u8 *buf = chip->buffers->databuf;
+	int ret;
+
+	memset(buf, 0xff, mtd->writesize);
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
+	ret = mtk_nfc_write_page_hwecc(mtd, chip, buf, MTK_OOB_ON, page);
+	if (ret < 0)
+		return -EIO;
+
+	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+	ret = chip->waitfunc(mtd, chip);
+
+	return ret & NAND_STATUS_FAIL ? -EIO : 0;
+}
+
+static int mtk_nfc_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+					int page)
+{
+	int ret;
+
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
+	ret = mtk_nfc_write_page_raw(mtd, chip, NULL, MTK_OOB_ON, page);
+	if (ret < 0)
+		return -EIO;
+
+	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+	ret = chip->waitfunc(mtd, chip);
+
+	return ret & NAND_STATUS_FAIL ? -EIO : 0;
+}
+
+static int mtk_nfc_ecc_check(struct mtd_info *mtd, struct nand_chip *chip,
+				u32 sectors)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	u32 offset, i, err, max_bitflip;
+
+	max_bitflip = 0;
+
+	for (i = 0; i < sectors; i++) {
+		offset = (i >> 2) << 2;
+		err = mtk_ecc_readl(host, MTKSDG1_ECC_DECENUM0 + offset);
+		err = err >> ((i % 4) * 8);
+		err &= ERR_MASK;
+		if (err == ERR_MASK) {
+			/* uncorrectable errors */
+			mtd->ecc_stats.failed++;
+			continue;
+		}
+
+		mtd->ecc_stats.corrected += err;
+		max_bitflip = max_t(u32, max_bitflip, err);
+	}
+
+	return max_bitflip;
+}
+
+static void mtk_nfc_read_fdm(struct nand_chip *chip, u32 sectors)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	int i, j, reg;
+	u8 *dst, *src;
+
+	for (i = 0; i < sectors; i++) {
+		/* read FDM register into host memory */
+		for (j = 0; j < ARRAY_SIZE(host->fdm_reg); j++) {
+			reg = MTKSDG1_NFI_FDM0L + i * MTKSDG1_NFI_FDM_REG_SIZE;
+			reg += j * sizeof(host->fdm_reg[0]);
+			host->fdm_reg[j] = mtk_nfi_readl(host, reg);
+		}
+
+		/* copy FDM register from host to OOB */
+		src = (u8 *)host->fdm_reg;
+		dst = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+		memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+	}
+}
+
+static int mtk_nfc_update_oob(struct mtd_info *mtd, struct nand_chip *chip,
+				u8 *buf, u32 sectors)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	int i, bitflips = 0;
+
+	/* if the page is empty, no bitflips and clear data and oob */
+	if (mtk_nfi_readl(host, MTKSDG1_NFI_STA) & STA_EMP_PAGE) {
+		memset(buf, 0xff, SECTORS_TO_BYTES(sectors));
+
+		/* empty page: update OOB with 0xFF */
+		for (i = 0; i < sectors; i++) {
+			memset(chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE,
+				0xff, MTKSDG1_NFI_FDM_REG_SIZE);
+		}
+	} else {
+		/* update OOB with HW info */
+		mtk_nfc_read_fdm(chip, sectors);
+
+		/* return the bitflips */
+		bitflips = mtk_nfc_ecc_check(mtd, chip, sectors);
+	}
+
+	return bitflips;
+}
+
+static int mtk_nfc_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	u8 *buf = chip->buffers->databuf;
+	int rc, i, pg;
+
+	/* block_markbad writes 0x00 at data and OOB */
+	memset(buf, 0x00, mtd->writesize + mtd->oobsize);
+
+	/* Write to first/last page(s) if necessary */
+	if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
+		ofs += mtd->erasesize - mtd->writesize;
+
+	i = 0;
+	do {
+		pg = (int)(ofs >> chip->page_shift);
+
+		/**
+		 *  write 0x00 to DATA & OOB in flash
+		 *  No need to reorganize the page since it is all 0x00
+		 */
+		chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, pg);
+		rc = mtk_nfc_write_page(mtd, chip, buf, MTK_OOB_OFF, pg,
+			MTK_ECC_OFF);
+		if (rc < 0)
+			return rc;
+
+		chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+		rc = chip->waitfunc(mtd, chip);
+		rc = rc & NAND_STATUS_FAIL ? -EIO : 0;
+		if (rc < 0)
+			return rc;
+
+		ofs += mtd->writesize;
+		i++;
+
+	} while ((chip->bbt_options & NAND_BBT_SCAN2NDPAGE) && i < 2);
+
+	return 0;
+}
+
+static int mtk_nfc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
+		uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi,
+		int page, int raw)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+	u32 reg, column, spare, sectors, start, end;
+	struct completion *nfi, *ecc;
+	const bool use_ecc = !raw;
+	int bitflips = -EIO;
+	dma_addr_t dma_addr;
+	size_t len;
+	u8 *buf;
+	int rc;
+
+	nfi = &host->nfi.complete;
+	ecc = &host->ecc.complete;
+
+	start = BYTES_TO_SECTORS(data_offs);
+	end = BYTES_TO_SECTORS(data_offs + readlen + SECTOR_SIZE - 1);
+	sectors = end - start;
+
+	spare = mtd->oobsize / chip->ecc.steps;
+	column =  start * (SECTOR_SIZE + spare);
+
+	len = SECTORS_TO_BYTES(sectors) + (raw ? sectors * spare : 0);
+	buf = bufpoi + SECTORS_TO_BYTES(start);
+
+	/* map the device memory */
+	dma_addr = dma_map_single(host->dev, buf, len, DMA_FROM_DEVICE);
+	if (dma_mapping_error(host->dev, dma_addr)) {
+		dev_err(host->dev, "dma mapping error\n");
+		return -EINVAL;
+	}
+
+	/* configure the transfer  */
+	reg = mtk_nfi_readw(host, MTKSDG1_NFI_CNFG);
+	reg |= CNFG_DMA_BURST_EN | CNFG_AHB;
+	if (use_ecc) {
+		reg |= CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN;
+		mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+
+		/* enable encoder */
+		mtk_ecc_decoder_idle(host);
+		mtk_ecc_writel(host, DEC_EN, MTKSDG1_ECC_DECCON);
+	} else
+		mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+
+	mtk_nfi_writel(host, sectors << CON_SEC_SHIFT, MTKSDG1_NFI_CON);
+	mtk_nfi_writew(host, INTR_BUSY_RT_EN, MTKSDG1_NFI_INTR_EN);
+
+	init_completion(nfi);
+
+	mtk_nfc_set_address(host, column, page, 2, host->row_nob);
+	mtk_nfc_set_command(host, NAND_CMD_READSTART);
+	rc = wait_for_completion_timeout(nfi, timeout);
+	if (!rc) {
+		dev_err(host->dev, "read busy return timeout\n");
+		goto error;
+	}
+
+	mtk_nfi_writew(host, INTR_AHB_DONE_EN, MTKSDG1_NFI_INTR_EN);
+	mtk_nfi_writel(host, lower_32_bits(dma_addr), MTKSDG1_NFI_STRADDR);
+
+	if (use_ecc) {
+		/* program ECC with sector count */
+		host->ecc.dec_sec = sectors;
+		init_completion(ecc);
+		mtk_ecc_writew(host, DEC_IRQEN, MTKSDG1_ECC_DECIRQ_EN);
+	}
+
+	init_completion(nfi);
+
+	/* start DMA */
+	reg = mtk_nfi_readl(host, MTKSDG1_NFI_CON) | CON_BRD;
+	mtk_nfi_writel(host, reg, MTKSDG1_NFI_CON);
+
+	rc = wait_for_completion_timeout(nfi, timeout);
+	if (!rc)
+		dev_warn(host->dev, "read ahb/dma done timeout\n");
+
+	/* DMA interrupt didn't trigger, check page done just in case */
+	rc = mtk_nfc_subpage_done(host, sectors);
+	if (rc < 0) {
+		dev_err(host->dev, "subpage done timeout\n");
+		goto error;
+	}
+
+	/* raw transfer successful */
+	bitflips = 0;
+
+	if (use_ecc) {
+		rc = wait_for_completion_timeout(ecc, timeout);
+		if (!rc) {
+			dev_err(host->dev, "ecc decode timeout\n");
+			host->ecc.dec_sec = 0;
+			bitflips = -ETIMEDOUT;
+			goto error;
+		}
+		bitflips = mtk_nfc_update_oob(mtd, chip, buf, sectors);
+	}
+
+error:
+	dma_unmap_single(host->dev, dma_addr, len, DMA_FROM_DEVICE);
+
+	if (use_ecc) {
+		/* make sure the ECC dec irq  is disabled */
+		mtk_ecc_writew(host, 0, MTKSDG1_ECC_DECIRQ_EN);
+		mtk_ecc_decoder_idle(host);
+
+		/* disable ECC dec */
+		mtk_ecc_writew(host, 0, MTKSDG1_ECC_DECCON);
+	}
+
+	mtk_nfi_writel(host, 0, MTKSDG1_NFI_CON);
+
+	return bitflips;
+}
+
+static int mtk_nfc_read_subpage_hwecc(struct mtd_info *mtd,
+				struct nand_chip *chip, uint32_t data_offs,
+				uint32_t readlen, uint8_t *bufpoi, int page)
+{
+	return mtk_nfc_read_subpage(mtd, chip, data_offs, readlen,
+					bufpoi, page, MTK_ECC_ON);
+}
+
+static int mtk_nfc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
+				uint8_t *buf, int oob_on, int page)
+{
+	return mtk_nfc_read_subpage_hwecc(mtd, chip, 0, mtd->writesize,
+						buf, page);
+}
+
+static int mtk_nfc_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+				uint8_t *buf, int oob_on, int page)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	uint8_t *src, *dst;
+	int i, ret;
+	size_t len;
+
+	dst = host->buffer;
+	memset(dst, 0xff, mtd->writesize + mtd->oobsize);
+	ret = mtk_nfc_read_subpage(mtd, chip, 0, mtd->writesize, dst, page, 1);
+	if (ret < 0)
+		return ret;
+
+	len = SECTOR_SIZE + mtd->oobsize / chip->ecc.steps;
+
+	/* copy to the output buffer */
+	for (i = 0; i < chip->ecc.steps; i++) {
+
+		/* copy sector data */
+		if (buf) {
+			src = host->buffer + i * len;
+			dst = buf + i * SECTOR_SIZE;
+			memcpy(dst, src, SECTOR_SIZE);
+		}
+
+		/* copy FDM data to OOB */
+		if (oob_on) {
+			src = host->buffer + i * len + SECTOR_SIZE;
+			dst = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+			memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+		}
+	}
+
+	return ret;
+}
+
+static void mtk_nfc_switch_oob(struct mtd_info *mtd, struct nand_chip *chip,
+					uint8_t *buf)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	size_t spare;
+	u32 sectors;
+	u8 *bufpoi;
+	int len;
+
+	spare = mtd->oobsize / chip->ecc.steps;
+	sectors = mtd->writesize / (SECTOR_SIZE + spare);
+
+	/**
+	 * MTK: DATA+oob1, DATA+oob2, DATA+oob3 ...
+	 * LNX: DATA+OOB
+	 */
+	/* point to the last oob_i from the NAND device*/
+	bufpoi = buf + mtd->writesize - (sectors * spare);
+	len = sizeof(host->fdm_reg);
+
+	/* copy NAND oob to private area */
+	memcpy(host->fdm_reg, bufpoi, len);
+
+	/* copy oob_poi to NAND */
+	memcpy(bufpoi, chip->oob_poi, len);
+
+	/* copy NAND oob to oob_poi */
+	memcpy(chip->oob_poi, host->fdm_reg, sizeof(host->fdm_reg));
+	memset(host->fdm_reg, 0x00, len);
+}
+
+static int mtk_nfc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+				int page)
+{
+	struct mtk_nfc_host *host = nand_get_controller_data(chip);
+	u8 *buf = chip->buffers->databuf;
+	struct mtd_ecc_stats stats;
+	int ret;
+
+	stats = mtd->ecc_stats;
+
+	memset(buf, 0xff, mtd->writesize);
+	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+
+	ret = mtk_nfc_read_page_hwecc(mtd, chip, buf, 1, page);
+
+	if (host->switch_oob)
+		mtk_nfc_switch_oob(mtd, chip, buf);
+
+	if (ret < mtd->bitflip_threshold)
+		mtd->ecc_stats.corrected = stats.corrected;
+
+	return ret;
+}
+
+static int mtk_nfc_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+				int page)
+{
+	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+
+	return mtk_nfc_read_page_raw(mtd, chip, NULL, MTK_OOB_ON, page);
+}
+
+static inline void mtk_nfc_hw_init(struct mtk_nfc_host *host)
+{
+	mtk_nfi_writel(host, 0x10804211, MTKSDG1_NFI_ACCCON);
+	mtk_nfi_writew(host, 0xf1, MTKSDG1_NFI_CNRNB);
+	mtk_nfc_hw_reset(host);
+
+	/* clear interrupt */
+	mtk_nfi_readl(host, MTKSDG1_NFI_INTR_STA);
+	mtk_nfi_writel(host, 0, MTKSDG1_NFI_INTR_EN);
+
+	/* ECC encoder init */
+	mtk_ecc_encoder_idle(host);
+	mtk_ecc_writew(host, ENC_DE, MTKSDG1_ECC_ENCCON);
+
+	/* ECC decoder init */
+	mtk_ecc_decoder_idle(host);
+	mtk_ecc_writel(host, DEC_DE, MTKSDG1_ECC_DECCON);
+}
+
+static irqreturn_t mtk_nfi_irq(int irq, void *devid)
+{
+	struct mtk_nfc_host *host = devid;
+	u16 sta, ien;
+
+	sta = mtk_nfi_readw(host, MTKSDG1_NFI_INTR_STA);
+	ien = mtk_nfi_readw(host, MTKSDG1_NFI_INTR_EN);
+
+	if (!(sta & ien))
+		return IRQ_NONE;
+
+	mtk_nfi_writew(host, ~sta & ien, MTKSDG1_NFI_INTR_EN);
+	complete(&host->nfi.complete);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mtk_ecc_irq(int irq, void *devid)
+{
+	struct mtk_nfc_host *host = devid;
+	u32 reg_val, mask;
+
+	reg_val = mtk_ecc_readw(host, MTKSDG1_ECC_DECIRQ_STA);
+	if (reg_val & DEC_IRQEN) {
+		if (host->ecc.dec_sec) {
+			mask = 1 << (host->ecc.dec_sec - 1);
+			reg_val = mtk_ecc_readw(host, MTKSDG1_ECC_DECDONE);
+			if (mask & reg_val) {
+				host->ecc.dec_sec = 0;
+				complete(&host->ecc.complete);
+				mtk_ecc_writew(host, 0, MTKSDG1_ECC_DECIRQ_EN);
+			}
+		} else
+			dev_warn(host->dev, "spurious DEC_IRQ\n");
+
+		return IRQ_HANDLED;
+	}
+
+	reg_val = mtk_ecc_readl(host, MTKSDG1_ECC_ENCIRQ_STA);
+	if (reg_val & ENC_IRQEN) {
+		complete(&host->ecc.complete);
+		mtk_ecc_writel(host, 0, MTKSDG1_ECC_ENCIRQ_EN);
+
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static int mtk_nfc_enable_clk(struct device *dev, struct mtk_nfc_clk *clk)
+{
+	int ret;
+
+	ret = clk_prepare_enable(clk->nfi_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable nfi clk\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(clk->nfiecc_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable nfiecc clk\n");
+		goto out_nfiecc_clk_disable;
+	}
+
+	ret = clk_prepare_enable(clk->pad_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable pad clk\n");
+		goto out_pad_clk_disable;
+	}
+
+	return 0;
+
+out_pad_clk_disable:
+	clk_disable_unprepare(clk->nfiecc_clk);
+
+out_nfiecc_clk_disable:
+	clk_disable_unprepare(clk->nfi_clk);
+
+	return ret;
+}
+
+static void mtk_nfc_disable_clk(struct mtk_nfc_clk *clk)
+{
+	clk_disable_unprepare(clk->nfi_clk);
+	clk_disable_unprepare(clk->nfiecc_clk);
+	clk_disable_unprepare(clk->pad_clk);
+}
+
+static int mtk_nfc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct mtk_nfc_host *host;
+	struct nand_chip *chip;
+	struct mtd_info *mtd;
+	struct resource *res;
+	int ret, irq;
+	size_t len;
+
+	host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+	if (!host)
+		return -ENOMEM;
+
+	chip = &host->chip;
+	mtd = nand_to_mtd(chip);
+	host->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	host->nfi.base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(host->nfi.base)) {
+		ret = PTR_ERR(host->nfi.base);
+		dev_err(dev, "no nfi base\n");
+		return ret;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	host->ecc.base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(host->ecc.base)) {
+		ret = PTR_ERR(host->ecc.base);
+		dev_err(dev, "no ecc base\n");
+		return ret;
+	}
+
+	host->clk.nfi_clk = devm_clk_get(dev, "nfi_clk");
+	if (IS_ERR(host->clk.nfi_clk)) {
+		dev_err(dev, "no clk\n");
+		ret = PTR_ERR(host->clk.nfi_clk);
+		return ret;
+	}
+
+	host->clk.nfiecc_clk = devm_clk_get(dev, "nfiecc_clk");
+	if (IS_ERR(host->clk.nfiecc_clk)) {
+		dev_err(dev, "no ecc clk\n");
+		ret = PTR_ERR(host->clk.nfiecc_clk);
+		return ret;
+	}
+
+	host->clk.pad_clk = devm_clk_get(dev, "pad_clk");
+	if (IS_ERR(host->clk.pad_clk)) {
+		dev_err(dev, "no pad clk\n");
+		ret = PTR_ERR(host->clk.pad_clk);
+		return ret;
+	}
+
+	ret = mtk_nfc_enable_clk(dev, &host->clk);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "no nfi irq resource\n");
+		ret = -EINVAL;
+		goto clk_disable;
+	}
+
+	ret = devm_request_irq(dev, irq, mtk_nfi_irq, 0x0, MTK_IRQ_NFI, host);
+	if (ret) {
+		dev_err(dev, "failed to request nfi irq\n");
+		goto clk_disable;
+	}
+
+	irq = platform_get_irq(pdev, 1);
+	if (irq < 0) {
+		dev_err(dev, "no ecc irq resource\n");
+		ret = -EINVAL;
+		goto clk_disable;
+	}
+
+	ret = devm_request_irq(dev, irq, mtk_ecc_irq, 0x0, MTK_IRQ_ECC, host);
+	if (ret) {
+		dev_err(dev, "failed to request ecc irq\n");
+		goto clk_disable;
+	}
+
+	ret = dma_set_mask(dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(dev, "failed to set dma mask\n");
+		goto clk_disable;
+	}
+
+	platform_set_drvdata(pdev, host);
+
+	mtd_set_of_node(mtd, np);
+	mtd->owner = THIS_MODULE;
+	mtd->dev.parent = dev;
+	mtd->name = MTK_NAME;
+
+	nand_set_controller_data(chip, host);
+	chip->options |= NAND_USE_BOUNCE_BUFFER | NAND_SUBPAGE_READ;
+	chip->block_markbad = mtk_nfc_block_markbad;
+	chip->select_chip = mtk_nfc_select_chip;
+	chip->read_byte = mtk_nfc_read_byte;
+	chip->cmdfunc = mtk_nfc_cmdfunc;
+	chip->ecc.mode = NAND_ECC_HW;
+	chip->ecc.write_subpage = mtk_nfc_write_subpage_hwecc;
+	chip->ecc.write_page_raw = mtk_nfc_write_page_raw;
+	chip->ecc.write_page = mtk_nfc_write_page_hwecc;
+	chip->ecc.write_oob_raw = mtk_nfc_write_oob_raw;
+	chip->ecc.write_oob = mtk_nfc_write_oob;
+	chip->ecc.read_subpage = mtk_nfc_read_subpage_hwecc;
+	chip->ecc.read_page_raw = mtk_nfc_read_page_raw;
+	chip->ecc.read_oob_raw = mtk_nfc_read_oob_raw;
+	chip->ecc.read_page = mtk_nfc_read_page_hwecc;
+	chip->ecc.read_oob = mtk_nfc_read_oob;
+
+	mtk_nfc_hw_init(host);
+
+	ret = nand_scan_ident(mtd, MTK_NAND_MAX_CHIP, NULL);
+	if (ret) {
+		ret = -ENODEV;
+		goto clk_disable;
+	}
+
+	ret = mtk_nfc_hw_runtime_config(mtd);
+	if (ret < 0) {
+		dev_err(dev, "nand device not supported\n");
+		goto clk_disable;
+	}
+
+	len = mtd->writesize + mtd->oobsize;
+	host->buffer = devm_kzalloc(dev, len, GFP_KERNEL);
+	if (!host->buffer) {
+		ret = -ENOMEM;
+		goto clk_disable;
+	}
+
+	/* required to create bbt table if not present */
+	host->switch_oob = true;
+	ret = nand_scan_tail(mtd);
+	if (ret) {
+		ret = -ENODEV;
+		goto clk_disable;
+	}
+	host->switch_oob = false;
+
+	ret = mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
+	if (ret) {
+		dev_err(dev, "mtd parse partition error\n");
+		goto nand_free;
+	}
+
+	return 0;
+
+nand_free:
+	nand_release(mtd);
+
+clk_disable:
+	mtk_nfc_disable_clk(&host->clk);
+
+	return ret;
+}
+
+static int mtk_nfc_remove(struct platform_device *pdev)
+{
+	struct mtk_nfc_host *host = platform_get_drvdata(pdev);
+	struct mtd_info *mtd = nand_to_mtd(&host->chip);
+
+	nand_release(mtd);
+	mtk_nfc_disable_clk(&host->clk);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_nfc_suspend(struct device *dev)
+{
+	struct mtk_nfc_host *host = dev_get_drvdata(dev);
+	struct mtk_nfc_saved_reg *reg = &host->saved_reg;
+
+	reg->nfi.emp_thresh = mtk_nfi_readl(host, MTKSDG1_NFI_EMPTY_THRESH);
+	reg->ecc.enccnfg = mtk_ecc_readl(host, MTKSDG1_ECC_ENCCNFG);
+	reg->ecc.deccnfg = mtk_ecc_readl(host, MTKSDG1_ECC_DECCNFG);
+	reg->nfi.pagefmt = mtk_nfi_readw(host, MTKSDG1_NFI_PAGEFMT);
+	reg->nfi.acccon = mtk_nfi_readl(host, MTKSDG1_NFI_ACCCON);
+	reg->nfi.cnrnb = mtk_nfi_readw(host, MTKSDG1_NFI_CNRNB);
+	reg->nfi.csel = mtk_nfi_readw(host, MTKSDG1_NFI_CSEL);
+
+	mtk_nfc_disable_clk(&host->clk);
+
+	return 0;
+}
+
+static int mtk_nfc_resume(struct device *dev)
+{
+	struct mtk_nfc_host *host = dev_get_drvdata(dev);
+	struct mtk_nfc_saved_reg *reg = &host->saved_reg;
+	struct nand_chip *chip = &host->chip;
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int ret;
+	u32 i;
+
+	udelay(200);
+
+	ret = mtk_nfc_enable_clk(dev, &host->clk);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < chip->numchips; i++) {
+		chip->select_chip(mtd, i);
+		chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+	}
+
+	mtk_nfi_writel(host, reg->nfi.emp_thresh, MTKSDG1_NFI_EMPTY_THRESH);
+	mtk_nfi_writew(host, reg->nfi.pagefmt, MTKSDG1_NFI_PAGEFMT);
+	mtk_ecc_writel(host, reg->ecc.enccnfg, MTKSDG1_ECC_ENCCNFG);
+	mtk_ecc_writel(host, reg->ecc.deccnfg, MTKSDG1_ECC_DECCNFG);
+	mtk_nfi_writel(host, reg->nfi.acccon, MTKSDG1_NFI_ACCCON);
+	mtk_nfi_writew(host, reg->nfi.cnrnb, MTKSDG1_NFI_CNRNB);
+	mtk_nfi_writew(host, reg->nfi.csel, MTKSDG1_NFI_CSEL);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(mtk_nfc_pm_ops, mtk_nfc_suspend, mtk_nfc_resume);
+#endif
+
+static const struct of_device_id mtk_nfc_id_table[] = {
+	{ .compatible = "mediatek,mt2701-nfc" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, mtk_nfc_id_table);
+
+static struct platform_driver mtk_nfc_driver = {
+	.probe  = mtk_nfc_probe,
+	.remove = mtk_nfc_remove,
+	.driver = {
+		.name  = MTK_NAME,
+		.of_match_table = mtk_nfc_id_table,
+#ifdef CONFIG_PM_SLEEP
+		.pm = &mtk_nfc_pm_ops,
+#endif
+	},
+};
+
+module_platform_driver(mtk_nfc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Xiaolei Li <xiaolei.li@mediatek.com>");
+MODULE_DESCRIPTION("MTK Nand Flash Controller Driver");
+
diff --git a/drivers/mtd/nand/mtksdg1_nand_ecc.h b/drivers/mtd/nand/mtksdg1_nand_ecc.h
new file mode 100644
index 0000000..d90b196
--- /dev/null
+++ b/drivers/mtd/nand/mtksdg1_nand_ecc.h
@@ -0,0 +1,75 @@
+/*
+ * MTK smart device ECC engine register.
+ * Copyright (C) 2015-2016 MediaTek Inc.
+ * Author: Xiaolei.Li <xiaolei.li@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef MTKSDG1_NAND_ECC_H
+#define MTKSDG1_NAND_ECC_H
+
+/* ECC engine register definition */
+#define MTKSDG1_ECC_ENCCON		(0x00)
+#define		ENC_EN			(1)
+#define		ENC_DE			(0)
+
+#define MTKSDG1_ECC_ENCCNFG		(0x04)
+#define		ECC_CNFG_4BIT		(0)
+#define		ECC_CNFG_12BIT		(4)
+#define		ECC_NFI_MODE		BIT(5)
+#define		ECC_DMA_MODE		(0)
+#define		ECC_ENC_MODE_MASK	(0x3 << 5)
+#define		ECC_MS_SHIFT		(16)
+
+#define MTKSDG1_ECC_ENCDIADDR		(0x08)
+
+#define MTKSDG1_ECC_ENCIDLE		(0x0C)
+#define		ENC_IDLE		BIT(0)
+
+#define MTKSDG1_ECC_ENCPAR0		(0x10)
+#define MTKSDG1_ECC_ENCSTA		(0x7C)
+
+#define MTKSDG1_ECC_ENCIRQ_EN		(0x80)
+#define		ENC_IRQEN		BIT(0)
+
+#define MTKSDG1_ECC_ENCIRQ_STA		(0x84)
+
+#define MTKSDG1_ECC_DECCON		(0x100)
+#define		DEC_EN			(1)
+#define		DEC_DE			(0)
+
+#define MTKSDG1_ECC_DECCNFG		(0x104)
+#define		DEC_EMPTY_EN		BIT(31)
+#define		DEC_CNFG_FER		(0x1 << 12)
+#define		DEC_CNFG_EL		(0x2 << 12)
+#define		DEC_CNFG_CORRECT	(0x3 << 12)
+
+#define MTKSDG1_ECC_DECIDLE		(0x10C)
+#define		DEC_IDLE		BIT(0)
+
+#define MTKSDG1_ECC_DECFER		(0x110)
+
+#define MTKSDG1_ECC_DECENUM0		(0x114)
+#define		ERR_MASK		(0x3f)
+
+#define MTKSDG1_ECC_DECDONE		(0x124)
+
+#define MTKSDG1_ECC_DECEL0		(0x128)
+
+#define MTKSDG1_ECC_DECIRQ_EN		(0x200)
+#define		DEC_IRQEN		BIT(0)
+
+#define MTKSDG1_ECC_DECIRQ_STA		(0x204)
+
+#define MTKSDG1_ECC_DECFSM		(0x208)
+#define		DECFSM_MASK		(0x7f0f0f0f)
+#define		DECFSM_IDLE		(0x01010101)
+#endif
diff --git a/drivers/mtd/nand/mtksdg1_nand_nfi.h b/drivers/mtd/nand/mtksdg1_nand_nfi.h
new file mode 100644
index 0000000..a9aa6f6
--- /dev/null
+++ b/drivers/mtd/nand/mtksdg1_nand_nfi.h
@@ -0,0 +1,119 @@
+/*
+ * MTK smart device NAND Flash controller register.
+ * Copyright (C) 2015-2016 MediaTek Inc.
+ * Author: Xiaolei.Li <xiaolei.li@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef MTKSDG1_NAND_NFI_H
+#define MTKSDG1_NAND_NFI_H
+
+/* NAND controller register definition */
+#define MTKSDG1_NFI_CNFG		(0x00)
+#define		CNFG_AHB		BIT(0)
+#define		CNFG_READ_EN		BIT(1)
+#define		CNFG_DMA_BURST_EN	BIT(2)
+#define		CNFG_BYTE_RW		BIT(6)
+#define		CNFG_HW_ECC_EN		BIT(8)
+#define		CNFG_AUTO_FMT_EN	BIT(9)
+#define		CNFG_OP_IDLE		(0 << 12)
+#define		CNFG_OP_READ		(1 << 12)
+#define		CNFG_OP_SRD		(2 << 12)
+#define		CNFG_OP_PRGM		(3 << 12)
+#define		CNFG_OP_ERASE		(4 << 12)
+#define		CNFG_OP_RESET		(5 << 12)
+#define		CNFG_OP_CUST		(6 << 12)
+
+#define MTKSDG1_NFI_PAGEFMT		(0x04)
+#define		PAGEFMT_FDM_ECC_SHIFT	(12)
+#define		PAGEFMT_FDM_SHIFT	(8)
+#define		PAGEFMT_SPARE_16	(0)
+#define		PAGEFMT_SPARE_32	(4)
+#define		PAGEFMT_SPARE_SHIFT	(4)
+#define		PAGEFMT_SEC_SEL_512	BIT(2)
+#define		PAGEFMT_512_2K		(0)
+#define		PAGEFMT_2K_4K		(1)
+#define		PAGEFMT_4K_8K		(2)
+
+/* NFI control */
+#define MTKSDG1_NFI_CON			(0x08)
+#define		CON_FIFO_FLUSH		BIT(0)
+#define		CON_NFI_RST		BIT(1)
+#define		CON_SRD			BIT(4)	/* single read */
+#define		CON_BRD			BIT(8)  /* burst  read */
+#define		CON_BWR			BIT(9)	/* burst  write */
+#define		CON_SEC_SHIFT		(12)
+
+/* Timming control register */
+#define MTKSDG1_NFI_ACCCON		(0x0C)
+
+#define MTKSDG1_NFI_INTR_EN		(0x10)
+#define		INTR_RD_DONE_EN		BIT(0)
+#define		INTR_WR_DONE_EN		BIT(1)
+#define		INTR_RST_DONE_EN	BIT(2)
+#define		INTR_ERS_DONE_EN	BIT(3)
+#define		INTR_BUSY_RT_EN		BIT(4)
+#define		INTR_AHB_DONE_EN	BIT(6)
+
+#define MTKSDG1_NFI_INTR_STA		(0x14)
+
+#define MTKSDG1_NFI_CMD			(0x20)
+
+#define MTKSDG1_NFI_ADDRNOB		(0x30)
+#define		ADDR_ROW_NOB_SHIFT	(4)
+
+#define MTKSDG1_NFI_COLADDR		(0x34)
+#define MTKSDG1_NFI_ROWADDR		(0x38)
+#define MTKSDG1_NFI_STRDATA		(0x40)
+#define MTKSDG1_NFI_CNRNB		(0x44)
+#define MTKSDG1_NFI_DATAW		(0x50)
+#define MTKSDG1_NFI_DATAR		(0x54)
+#define MTKSDG1_NFI_PIO_DIRDY		(0x58)
+#define		PIO_DI_RDY		(0x01)
+
+/* NFI state*/
+#define MTKSDG1_NFI_STA			(0x60)
+#define		STA_CMD			BIT(0)
+#define		STA_ADDR		BIT(1)
+#define		STA_DATAR		BIT(2)
+#define		STA_DATAW		BIT(3)
+#define		STA_EMP_PAGE		BIT(12)
+
+#define MTKSDG1_NFI_FIFOSTA		(0x64)
+
+#define MTKSDG1_NFI_ADDRCNTR		(0x70)
+#define		CNTR_MASK		GENMASK(16, 12)
+
+#define MTKSDG1_NFI_STRADDR		(0x80)
+#define MTKSDG1_NFI_BYTELEN		(0x84)
+#define MTKSDG1_NFI_CSEL		(0x90)
+#define MTKSDG1_NFI_IOCON		(0x94)
+
+/* FDM data for sector: FDM0[L,H] - FDMF[L,H] */
+#define MTKSDG1_NFI_FDM_MAX_SEC		(0x10)
+#define MTKSDG1_NFI_FDM_REG_SIZE	(8)
+#define MTKSDG1_NFI_FDM0L		(0xA0)
+#define MTKSDG1_NFI_FDM0M		(0xA4)
+
+
+#define MTKSDG1_NFI_FIFODATA0		(0x190)
+#define MTKSDG1_NFI_DEBUG_CON1		(0x220)
+#define MTKSDG1_NFI_MASTER_STA		(0x224)
+#define		MASTER_STA_MASK		(0x0FFF)
+
+#define MTKSDG1_NFI_RANDOM_CNFG		(0x238)
+#define MTKSDG1_NFI_EMPTY_THRESH	(0x23C)
+#define MTKSDG1_NFI_NAND_TYPE		(0x240)
+#define MTKSDG1_NFI_ACCCON1		(0x244)
+#define MTKSDG1_NFI_DELAY_CTRL		(0x248)
+
+#endif
+
-- 
1.7.10.4

