Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1370 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
new file mode 100644
index 000000000..265635db2
--- /dev/null
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -0,0 +1,1370 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Xudong Chen <xudong.chen@mediatek.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#define I2C_RS_TRANSFER			(1 << 4)
+#define I2C_ARB_LOST			(1 << 3)
+#define I2C_HS_NACKERR			(1 << 2)
+#define I2C_ACKERR			(1 << 1)
+#define I2C_TRANSAC_COMP		(1 << 0)
+#define I2C_TRANSAC_START		(1 << 0)
+#define I2C_RS_MUL_CNFG			(1 << 15)
+#define I2C_RS_MUL_TRIG			(1 << 14)
+#define I2C_DCM_DISABLE			0x0000
+#define I2C_IO_CONFIG_OPEN_DRAIN	0x0003
+#define I2C_IO_CONFIG_PUSH_PULL		0x0000
+#define I2C_SOFT_RST			0x0001
+#define I2C_HANDSHAKE_RST		0x0020
+#define I2C_FIFO_ADDR_CLR		0x0001
+#define I2C_DELAY_LEN			0x0002
+#define I2C_ST_START_CON		0x8001
+#define I2C_FS_START_CON		0x1800
+#define I2C_TIME_CLR_VALUE		0x0000
+#define I2C_TIME_DEFAULT_VALUE		0x0003
+#define I2C_WRRD_TRANAC_VALUE		0x0002
+#define I2C_RD_TRANAC_VALUE		0x0001
+#define I2C_SCL_MIS_COMP_VALUE		0x0000
+#define I2C_CHN_CLR_FLAG		0x0000
+
+#define I2C_DMA_CON_TX			0x0000
+#define I2C_DMA_CON_RX			0x0001
+#define I2C_DMA_ASYNC_MODE		0x0004
+#define I2C_DMA_SKIP_CONFIG		0x0010
+#define I2C_DMA_DIR_CHANGE		0x0200
+#define I2C_DMA_START_EN		0x0001
+#define I2C_DMA_INT_FLAG_NONE		0x0000
+#define I2C_DMA_CLR_FLAG		0x0000
+#define I2C_DMA_WARM_RST		0x0001
+#define I2C_DMA_HARD_RST		0x0002
+#define I2C_DMA_HANDSHAKE_RST		0x0004
+
+#define MAX_SAMPLE_CNT_DIV		8
+#define MAX_STEP_CNT_DIV		64
+#define MAX_CLOCK_DIV			256
+#define MAX_HS_STEP_CNT_DIV		8
+#define I2C_STANDARD_MODE_BUFFER	(1000 / 2)
+#define I2C_FAST_MODE_BUFFER		(300 / 2)
+#define I2C_FAST_MODE_PLUS_BUFFER	(20 / 2)
+
+#define I2C_CONTROL_RS                  (0x1 << 1)
+#define I2C_CONTROL_DMA_EN              (0x1 << 2)
+#define I2C_CONTROL_CLK_EXT_EN          (0x1 << 3)
+#define I2C_CONTROL_DIR_CHANGE          (0x1 << 4)
+#define I2C_CONTROL_ACKERR_DET_EN       (0x1 << 5)
+#define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6)
+#define I2C_CONTROL_DMAACK_EN           (0x1 << 8)
+#define I2C_CONTROL_ASYNC_MODE          (0x1 << 9)
+#define I2C_CONTROL_WRAPPER             (0x1 << 0)
+
+#define I2C_DRV_NAME		"i2c-mt65xx"
+
+enum DMA_REGS_OFFSET {
+	OFFSET_INT_FLAG = 0x0,
+	OFFSET_INT_EN = 0x04,
+	OFFSET_EN = 0x08,
+	OFFSET_RST = 0x0c,
+	OFFSET_CON = 0x18,
+	OFFSET_TX_MEM_ADDR = 0x1c,
+	OFFSET_RX_MEM_ADDR = 0x20,
+	OFFSET_TX_LEN = 0x24,
+	OFFSET_RX_LEN = 0x28,
+	OFFSET_TX_4G_MODE = 0x54,
+	OFFSET_RX_4G_MODE = 0x58,
+};
+
+enum i2c_trans_st_rs {
+	I2C_TRANS_STOP = 0,
+	I2C_TRANS_REPEATED_START,
+};
+
+enum mtk_trans_op {
+	I2C_MASTER_WR = 1,
+	I2C_MASTER_RD,
+	I2C_MASTER_WRRD,
+};
+
+enum I2C_REGS_OFFSET {
+	OFFSET_DATA_PORT,
+	OFFSET_SLAVE_ADDR,
+	OFFSET_INTR_MASK,
+	OFFSET_INTR_STAT,
+	OFFSET_CONTROL,
+	OFFSET_TRANSFER_LEN,
+	OFFSET_TRANSAC_LEN,
+	OFFSET_DELAY_LEN,
+	OFFSET_TIMING,
+	OFFSET_START,
+	OFFSET_EXT_CONF,
+	OFFSET_FIFO_STAT,
+	OFFSET_FIFO_THRESH,
+	OFFSET_FIFO_ADDR_CLR,
+	OFFSET_IO_CONFIG,
+	OFFSET_RSV_DEBUG,
+	OFFSET_HS,
+	OFFSET_SOFTRESET,
+	OFFSET_DCM_EN,
+	OFFSET_PATH_DIR,
+	OFFSET_DEBUGSTAT,
+	OFFSET_DEBUGCTRL,
+	OFFSET_TRANSFER_LEN_AUX,
+	OFFSET_CLOCK_DIV,
+	OFFSET_LTIMING,
+	OFFSET_SCL_HIGH_LOW_RATIO,
+	OFFSET_HS_SCL_HIGH_LOW_RATIO,
+	OFFSET_SCL_MIS_COMP_POINT,
+	OFFSET_STA_STO_AC_TIMING,
+	OFFSET_HS_STA_STO_AC_TIMING,
+	OFFSET_SDA_TIMING,
+};
+
+static const u16 mt_i2c_regs_v1[] = {
+	[OFFSET_DATA_PORT] = 0x0,
+	[OFFSET_SLAVE_ADDR] = 0x4,
+	[OFFSET_INTR_MASK] = 0x8,
+	[OFFSET_INTR_STAT] = 0xc,
+	[OFFSET_CONTROL] = 0x10,
+	[OFFSET_TRANSFER_LEN] = 0x14,
+	[OFFSET_TRANSAC_LEN] = 0x18,
+	[OFFSET_DELAY_LEN] = 0x1c,
+	[OFFSET_TIMING] = 0x20,
+	[OFFSET_START] = 0x24,
+	[OFFSET_EXT_CONF] = 0x28,
+	[OFFSET_FIFO_STAT] = 0x30,
+	[OFFSET_FIFO_THRESH] = 0x34,
+	[OFFSET_FIFO_ADDR_CLR] = 0x38,
+	[OFFSET_IO_CONFIG] = 0x40,
+	[OFFSET_RSV_DEBUG] = 0x44,
+	[OFFSET_HS] = 0x48,
+	[OFFSET_SOFTRESET] = 0x50,
+	[OFFSET_DCM_EN] = 0x54,
+	[OFFSET_PATH_DIR] = 0x60,
+	[OFFSET_DEBUGSTAT] = 0x64,
+	[OFFSET_DEBUGCTRL] = 0x68,
+	[OFFSET_TRANSFER_LEN_AUX] = 0x6c,
+	[OFFSET_CLOCK_DIV] = 0x70,
+	[OFFSET_SCL_HIGH_LOW_RATIO] = 0x74,
+	[OFFSET_HS_SCL_HIGH_LOW_RATIO] = 0x78,
+	[OFFSET_SCL_MIS_COMP_POINT] = 0x7C,
+	[OFFSET_STA_STO_AC_TIMING] = 0x80,
+	[OFFSET_HS_STA_STO_AC_TIMING] = 0x84,
+	[OFFSET_SDA_TIMING] = 0x88,
+};
+
+static const u16 mt_i2c_regs_v2[] = {
+	[OFFSET_DATA_PORT] = 0x0,
+	[OFFSET_SLAVE_ADDR] = 0x4,
+	[OFFSET_INTR_MASK] = 0x8,
+	[OFFSET_INTR_STAT] = 0xc,
+	[OFFSET_CONTROL] = 0x10,
+	[OFFSET_TRANSFER_LEN] = 0x14,
+	[OFFSET_TRANSAC_LEN] = 0x18,
+	[OFFSET_DELAY_LEN] = 0x1c,
+	[OFFSET_TIMING] = 0x20,
+	[OFFSET_START] = 0x24,
+	[OFFSET_EXT_CONF] = 0x28,
+	[OFFSET_LTIMING] = 0x2c,
+	[OFFSET_HS] = 0x30,
+	[OFFSET_IO_CONFIG] = 0x34,
+	[OFFSET_FIFO_ADDR_CLR] = 0x38,
+	[OFFSET_SDA_TIMING] = 0x3c,
+	[OFFSET_TRANSFER_LEN_AUX] = 0x44,
+	[OFFSET_CLOCK_DIV] = 0x48,
+	[OFFSET_SOFTRESET] = 0x50,
+	[OFFSET_SCL_MIS_COMP_POINT] = 0x90,
+	[OFFSET_DEBUGSTAT] = 0xe4,
+	[OFFSET_DEBUGCTRL] = 0xe8,
+	[OFFSET_FIFO_STAT] = 0xf4,
+	[OFFSET_FIFO_THRESH] = 0xf8,
+	[OFFSET_DCM_EN] = 0xf88,
+};
+
+struct mtk_i2c_compatible {
+	const struct i2c_adapter_quirks *quirks;
+	const u16 *regs;
+	unsigned char pmic_i2c: 1;
+	unsigned char dcm: 1;
+	unsigned char auto_restart: 1;
+	unsigned char aux_len_reg: 1;
+	unsigned char timing_adjust: 1;
+	unsigned char dma_sync: 1;
+	unsigned char ltiming_adjust: 1;
+	unsigned char apdma_sync: 1;
+	unsigned char max_dma_support;
+};
+
+struct mtk_i2c_ac_timing {
+	u16 htiming;
+	u16 ltiming;
+	u16 hs;
+	u16 ext;
+	u16 inter_clk_div;
+	u16 scl_hl_ratio;
+	u16 hs_scl_hl_ratio;
+	u16 sta_stop;
+	u16 hs_sta_stop;
+	u16 sda_timing;
+};
+
+struct mtk_i2c {
+	struct i2c_adapter adap;	/* i2c host adapter */
+	struct device *dev;
+	struct completion msg_complete;
+
+	/* set in i2c probe */
+	void __iomem *base;		/* i2c base addr */
+	void __iomem *pdmabase;		/* dma base address*/
+	struct clk *clk_main;		/* main clock for i2c bus */
+	struct clk *clk_dma;		/* DMA clock for i2c via DMA */
+	struct clk *clk_pmic;		/* PMIC clock for i2c from PMIC */
+	struct clk *clk_arb;		/* Arbitrator clock for i2c */
+	bool have_pmic;			/* can use i2c pins from PMIC */
+	bool use_push_pull;		/* IO config push-pull mode */
+
+	u16 irq_stat;			/* interrupt status */
+	unsigned int clk_src_div;
+	unsigned int speed_hz;		/* The speed in transfer */
+	enum mtk_trans_op op;
+	u16 timing_reg;
+	u16 high_speed_reg;
+	u16 ltiming_reg;
+	unsigned char auto_restart;
+	bool ignore_restart_irq;
+	struct mtk_i2c_ac_timing ac_timing;
+	const struct mtk_i2c_compatible *dev_comp;
+};
+
+/**
+ * struct i2c_spec_values:
+ * @min_low_ns: min LOW period of the SCL clock
+ * @min_su_sta_ns: min set-up time for a repeated START condition
+ * @max_hd_dat_ns: max data hold time
+ * @min_su_dat_ns: min data set-up time
+ */
+struct i2c_spec_values {
+	unsigned int min_low_ns;
+	unsigned int min_su_sta_ns;
+	unsigned int max_hd_dat_ns;
+	unsigned int min_su_dat_ns;
+};
+
+static const struct i2c_spec_values standard_mode_spec = {
+	.min_low_ns = 4700 + I2C_STANDARD_MODE_BUFFER,
+	.min_su_sta_ns = 4700 + I2C_STANDARD_MODE_BUFFER,
+	.max_hd_dat_ns = 3450 - I2C_STANDARD_MODE_BUFFER,
+	.min_su_dat_ns = 250 + I2C_STANDARD_MODE_BUFFER,
+};
+
+static const struct i2c_spec_values fast_mode_spec = {
+	.min_low_ns = 1300 + I2C_FAST_MODE_BUFFER,
+	.min_su_sta_ns = 600 + I2C_FAST_MODE_BUFFER,
+	.max_hd_dat_ns = 900 - I2C_FAST_MODE_BUFFER,
+	.min_su_dat_ns = 100 + I2C_FAST_MODE_BUFFER,
+};
+
+static const struct i2c_spec_values fast_mode_plus_spec = {
+	.min_low_ns = 500 + I2C_FAST_MODE_PLUS_BUFFER,
+	.min_su_sta_ns = 260 + I2C_FAST_MODE_PLUS_BUFFER,
+	.max_hd_dat_ns = 400 - I2C_FAST_MODE_PLUS_BUFFER,
+	.min_su_dat_ns = 50 + I2C_FAST_MODE_PLUS_BUFFER,
+};
+
+static const struct i2c_adapter_quirks mt6577_i2c_quirks = {
+	.flags = I2C_AQ_COMB_WRITE_THEN_READ,
+	.max_num_msgs = 1,
+	.max_write_len = 255,
+	.max_read_len = 255,
+	.max_comb_1st_msg_len = 255,
+	.max_comb_2nd_msg_len = 31,
+};
+
+static const struct i2c_adapter_quirks mt7622_i2c_quirks = {
+	.max_num_msgs = 255,
+};
+
+static const struct i2c_adapter_quirks mt8183_i2c_quirks = {
+	.flags = I2C_AQ_NO_ZERO_LEN,
+};
+
+static const struct mtk_i2c_compatible mt2712_compat = {
+	.regs = mt_i2c_regs_v1,
+	.pmic_i2c = 0,
+	.dcm = 1,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.timing_adjust = 1,
+	.dma_sync = 0,
+	.ltiming_adjust = 0,
+	.apdma_sync = 0,
+	.max_dma_support = 33,
+};
+
+static const struct mtk_i2c_compatible mt6577_compat = {
+	.quirks = &mt6577_i2c_quirks,
+	.regs = mt_i2c_regs_v1,
+	.pmic_i2c = 0,
+	.dcm = 1,
+	.auto_restart = 0,
+	.aux_len_reg = 0,
+	.timing_adjust = 0,
+	.dma_sync = 0,
+	.ltiming_adjust = 0,
+	.apdma_sync = 0,
+	.max_dma_support = 32,
+};
+
+static const struct mtk_i2c_compatible mt6589_compat = {
+	.quirks = &mt6577_i2c_quirks,
+	.regs = mt_i2c_regs_v1,
+	.pmic_i2c = 1,
+	.dcm = 0,
+	.auto_restart = 0,
+	.aux_len_reg = 0,
+	.timing_adjust = 0,
+	.dma_sync = 0,
+	.ltiming_adjust = 0,
+	.apdma_sync = 0,
+	.max_dma_support = 32,
+};
+
+static const struct mtk_i2c_compatible mt7622_compat = {
+	.quirks = &mt7622_i2c_quirks,
+	.regs = mt_i2c_regs_v1,
+	.pmic_i2c = 0,
+	.dcm = 1,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.timing_adjust = 0,
+	.dma_sync = 0,
+	.ltiming_adjust = 0,
+	.apdma_sync = 0,
+	.max_dma_support = 32,
+};
+
+static const struct mtk_i2c_compatible mt8173_compat = {
+	.regs = mt_i2c_regs_v1,
+	.pmic_i2c = 0,
+	.dcm = 1,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.timing_adjust = 0,
+	.dma_sync = 0,
+	.ltiming_adjust = 0,
+	.apdma_sync = 0,
+	.max_dma_support = 33,
+};
+
+static const struct mtk_i2c_compatible mt8183_compat = {
+	.quirks = &mt8183_i2c_quirks,
+	.regs = mt_i2c_regs_v2,
+	.pmic_i2c = 0,
+	.dcm = 0,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.timing_adjust = 1,
+	.dma_sync = 1,
+	.ltiming_adjust = 1,
+	.apdma_sync = 0,
+	.max_dma_support = 33,
+};
+
+static const struct mtk_i2c_compatible mt8192_compat = {
+	.quirks = &mt8183_i2c_quirks,
+	.regs = mt_i2c_regs_v2,
+	.pmic_i2c = 0,
+	.dcm = 0,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.timing_adjust = 1,
+	.dma_sync = 1,
+	.ltiming_adjust = 1,
+	.apdma_sync = 1,
+	.max_dma_support = 36,
+};
+
+static const struct of_device_id mtk_i2c_of_match[] = {
+	{ .compatible = "mediatek,mt2712-i2c", .data = &mt2712_compat },
+	{ .compatible = "mediatek,mt6577-i2c", .data = &mt6577_compat },
+	{ .compatible = "mediatek,mt6589-i2c", .data = &mt6589_compat },
+	{ .compatible = "mediatek,mt7622-i2c", .data = &mt7622_compat },
+	{ .compatible = "mediatek,mt8173-i2c", .data = &mt8173_compat },
+	{ .compatible = "mediatek,mt8183-i2c", .data = &mt8183_compat },
+	{ .compatible = "mediatek,mt8192-i2c", .data = &mt8192_compat },
+	{}
+};
+MODULE_DEVICE_TABLE(of, mtk_i2c_of_match);
+
+static u16 mtk_i2c_readw(struct mtk_i2c *i2c, enum I2C_REGS_OFFSET reg)
+{
+	return readw(i2c->base + i2c->dev_comp->regs[reg]);
+}
+
+static void mtk_i2c_writew(struct mtk_i2c *i2c, u16 val,
+			   enum I2C_REGS_OFFSET reg)
+{
+	writew(val, i2c->base + i2c->dev_comp->regs[reg]);
+}
+
+static int mtk_i2c_clock_enable(struct mtk_i2c *i2c)
+{
+	int ret;
+
+	ret = clk_prepare_enable(i2c->clk_dma);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(i2c->clk_main);
+	if (ret)
+		goto err_main;
+
+	if (i2c->have_pmic) {
+		ret = clk_prepare_enable(i2c->clk_pmic);
+		if (ret)
+			goto err_pmic;
+	}
+
+	if (i2c->clk_arb) {
+		ret = clk_prepare_enable(i2c->clk_arb);
+		if (ret)
+			goto err_arb;
+	}
+
+	return 0;
+
+err_arb:
+	if (i2c->have_pmic)
+		clk_disable_unprepare(i2c->clk_pmic);
+err_pmic:
+	clk_disable_unprepare(i2c->clk_main);
+err_main:
+	clk_disable_unprepare(i2c->clk_dma);
+
+	return ret;
+}
+
+static void mtk_i2c_clock_disable(struct mtk_i2c *i2c)
+{
+	if (i2c->clk_arb)
+		clk_disable_unprepare(i2c->clk_arb);
+
+	if (i2c->have_pmic)
+		clk_disable_unprepare(i2c->clk_pmic);
+
+	clk_disable_unprepare(i2c->clk_main);
+	clk_disable_unprepare(i2c->clk_dma);
+}
+
+static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
+{
+	u16 control_reg;
+	u16 intr_stat_reg;
+	u16 ext_conf_val;
+
+	mtk_i2c_writew(i2c, I2C_CHN_CLR_FLAG, OFFSET_START);
+	intr_stat_reg = mtk_i2c_readw(i2c, OFFSET_INTR_STAT);
+	mtk_i2c_writew(i2c, intr_stat_reg, OFFSET_INTR_STAT);
+
+	if (i2c->dev_comp->apdma_sync) {
+		writel(I2C_DMA_WARM_RST, i2c->pdmabase + OFFSET_RST);
+		udelay(10);
+		writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
+		udelay(10);
+		writel(I2C_DMA_HANDSHAKE_RST | I2C_DMA_HARD_RST,
+		       i2c->pdmabase + OFFSET_RST);
+		mtk_i2c_writew(i2c, I2C_HANDSHAKE_RST | I2C_SOFT_RST,
+			       OFFSET_SOFTRESET);
+		udelay(10);
+		writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
+		mtk_i2c_writew(i2c, I2C_CHN_CLR_FLAG, OFFSET_SOFTRESET);
+	} else {
+		writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST);
+		udelay(50);
+		writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
+		mtk_i2c_writew(i2c, I2C_SOFT_RST, OFFSET_SOFTRESET);
+	}
+
+	/* Set ioconfig */
+	if (i2c->use_push_pull)
+		mtk_i2c_writew(i2c, I2C_IO_CONFIG_PUSH_PULL, OFFSET_IO_CONFIG);
+	else
+		mtk_i2c_writew(i2c, I2C_IO_CONFIG_OPEN_DRAIN, OFFSET_IO_CONFIG);
+
+	if (i2c->dev_comp->dcm)
+		mtk_i2c_writew(i2c, I2C_DCM_DISABLE, OFFSET_DCM_EN);
+
+	mtk_i2c_writew(i2c, i2c->timing_reg, OFFSET_TIMING);
+	mtk_i2c_writew(i2c, i2c->high_speed_reg, OFFSET_HS);
+	if (i2c->dev_comp->ltiming_adjust)
+		mtk_i2c_writew(i2c, i2c->ltiming_reg, OFFSET_LTIMING);
+
+	if (i2c->speed_hz <= I2C_MAX_STANDARD_MODE_FREQ)
+		ext_conf_val = I2C_ST_START_CON;
+	else
+		ext_conf_val = I2C_FS_START_CON;
+
+	if (i2c->dev_comp->timing_adjust) {
+		ext_conf_val = i2c->ac_timing.ext;
+		mtk_i2c_writew(i2c, i2c->ac_timing.inter_clk_div,
+			       OFFSET_CLOCK_DIV);
+		mtk_i2c_writew(i2c, I2C_SCL_MIS_COMP_VALUE,
+			       OFFSET_SCL_MIS_COMP_POINT);
+		mtk_i2c_writew(i2c, i2c->ac_timing.sda_timing,
+			       OFFSET_SDA_TIMING);
+
+		if (i2c->dev_comp->ltiming_adjust) {
+			mtk_i2c_writew(i2c, i2c->ac_timing.htiming,
+				       OFFSET_TIMING);
+			mtk_i2c_writew(i2c, i2c->ac_timing.hs, OFFSET_HS);
+			mtk_i2c_writew(i2c, i2c->ac_timing.ltiming,
+				       OFFSET_LTIMING);
+		} else {
+			mtk_i2c_writew(i2c, i2c->ac_timing.scl_hl_ratio,
+				       OFFSET_SCL_HIGH_LOW_RATIO);
+			mtk_i2c_writew(i2c, i2c->ac_timing.hs_scl_hl_ratio,
+				       OFFSET_HS_SCL_HIGH_LOW_RATIO);
+			mtk_i2c_writew(i2c, i2c->ac_timing.sta_stop,
+				       OFFSET_STA_STO_AC_TIMING);
+			mtk_i2c_writew(i2c, i2c->ac_timing.hs_sta_stop,
+				       OFFSET_HS_STA_STO_AC_TIMING);
+		}
+	}
+	mtk_i2c_writew(i2c, ext_conf_val, OFFSET_EXT_CONF);
+
+	/* If use i2c pin from PMIC mt6397 side, need set PATH_DIR first */
+	if (i2c->have_pmic)
+		mtk_i2c_writew(i2c, I2C_CONTROL_WRAPPER, OFFSET_PATH_DIR);
+
+	control_reg = I2C_CONTROL_ACKERR_DET_EN |
+		      I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN;
+	if (i2c->dev_comp->dma_sync)
+		control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE;
+
+	mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL);
+	mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN);
+}
+
+static const struct i2c_spec_values *mtk_i2c_get_spec(unsigned int speed)
+{
+	if (speed <= I2C_MAX_STANDARD_MODE_FREQ)
+		return &standard_mode_spec;
+	else if (speed <= I2C_MAX_FAST_MODE_FREQ)
+		return &fast_mode_spec;
+	else
+		return &fast_mode_plus_spec;
+}
+
+static int mtk_i2c_max_step_cnt(unsigned int target_speed)
+{
+	if (target_speed > I2C_MAX_FAST_MODE_PLUS_FREQ)
+		return MAX_HS_STEP_CNT_DIV;
+	else
+		return MAX_STEP_CNT_DIV;
+}
+
+/*
+ * Check and Calculate i2c ac-timing
+ *
+ * Hardware design:
+ * sample_ns = (1000000000 * (sample_cnt + 1)) / clk_src
+ * xxx_cnt_div =  spec->min_xxx_ns / sample_ns
+ *
+ * Sample_ns is rounded down for xxx_cnt_div would be greater
+ * than the smallest spec.
+ * The sda_timing is chosen as the middle value between
+ * the largest and smallest.
+ */
+static int mtk_i2c_check_ac_timing(struct mtk_i2c *i2c,
+				   unsigned int clk_src,
+				   unsigned int check_speed,
+				   unsigned int step_cnt,
+				   unsigned int sample_cnt)
+{
+	const struct i2c_spec_values *spec;
+	unsigned int su_sta_cnt, low_cnt, high_cnt, max_step_cnt;
+	unsigned int sda_max, sda_min, clk_ns, max_sta_cnt = 0x3f;
+	unsigned int sample_ns = div_u64(1000000000ULL * (sample_cnt + 1),
+					 clk_src);
+
+	if (!i2c->dev_comp->timing_adjust)
+		return 0;
+
+	if (i2c->dev_comp->ltiming_adjust)
+		max_sta_cnt = 0x100;
+
+	spec = mtk_i2c_get_spec(check_speed);
+
+	if (i2c->dev_comp->ltiming_adjust)
+		clk_ns = 1000000000 / clk_src;
+	else
+		clk_ns = sample_ns / 2;
+
+	su_sta_cnt = DIV_ROUND_UP(spec->min_su_sta_ns, clk_ns);
+	if (su_sta_cnt > max_sta_cnt)
+		return -1;
+
+	low_cnt = DIV_ROUND_UP(spec->min_low_ns, sample_ns);
+	max_step_cnt = mtk_i2c_max_step_cnt(check_speed);
+	if ((2 * step_cnt) > low_cnt && low_cnt < max_step_cnt) {
+		if (low_cnt > step_cnt) {
+			high_cnt = 2 * step_cnt - low_cnt;
+		} else {
+			high_cnt = step_cnt;
+			low_cnt = step_cnt;
+		}
+	} else {
+		return -2;
+	}
+
+	sda_max = spec->max_hd_dat_ns / sample_ns;
+	if (sda_max > low_cnt)
+		sda_max = 0;
+
+	sda_min = DIV_ROUND_UP(spec->min_su_dat_ns, sample_ns);
+	if (sda_min < low_cnt)
+		sda_min = 0;
+
+	if (sda_min > sda_max)
+		return -3;
+
+	if (check_speed > I2C_MAX_FAST_MODE_PLUS_FREQ) {
+		if (i2c->dev_comp->ltiming_adjust) {
+			i2c->ac_timing.hs = I2C_TIME_DEFAULT_VALUE |
+				(sample_cnt << 12) | (high_cnt << 8);
+			i2c->ac_timing.ltiming &= ~GENMASK(15, 9);
+			i2c->ac_timing.ltiming |= (sample_cnt << 12) |
+				(low_cnt << 9);
+			i2c->ac_timing.ext &= ~GENMASK(7, 1);
+			i2c->ac_timing.ext |= (su_sta_cnt << 1) | (1 << 0);
+		} else {
+			i2c->ac_timing.hs_scl_hl_ratio = (1 << 12) |
+				(high_cnt << 6) | low_cnt;
+			i2c->ac_timing.hs_sta_stop = (su_sta_cnt << 8) |
+				su_sta_cnt;
+		}
+		i2c->ac_timing.sda_timing &= ~GENMASK(11, 6);
+		i2c->ac_timing.sda_timing |= (1 << 12) |
+			((sda_max + sda_min) / 2) << 6;
+	} else {
+		if (i2c->dev_comp->ltiming_adjust) {
+			i2c->ac_timing.htiming = (sample_cnt << 8) | (high_cnt);
+			i2c->ac_timing.ltiming = (sample_cnt << 6) | (low_cnt);
+			i2c->ac_timing.ext = (su_sta_cnt << 8) | (1 << 0);
+		} else {
+			i2c->ac_timing.scl_hl_ratio = (1 << 12) |
+				(high_cnt << 6) | low_cnt;
+			i2c->ac_timing.sta_stop = (su_sta_cnt << 8) |
+				su_sta_cnt;
+		}
+
+		i2c->ac_timing.sda_timing = (1 << 12) |
+			(sda_max + sda_min) / 2;
+	}
+
+	return 0;
+}
+
+/*
+ * Calculate i2c port speed
+ *
+ * Hardware design:
+ * i2c_bus_freq = parent_clk / (clock_div * 2 * sample_cnt * step_cnt)
+ * clock_div: fixed in hardware, but may be various in different SoCs
+ *
+ * The calculation want to pick the highest bus frequency that is still
+ * less than or equal to i2c->speed_hz. The calculation try to get
+ * sample_cnt and step_cn
+ */
+static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src,
+				   unsigned int target_speed,
+				   unsigned int *timing_step_cnt,
+				   unsigned int *timing_sample_cnt)
+{
+	unsigned int step_cnt;
+	unsigned int sample_cnt;
+	unsigned int max_step_cnt;
+	unsigned int base_sample_cnt = MAX_SAMPLE_CNT_DIV;
+	unsigned int base_step_cnt;
+	unsigned int opt_div;
+	unsigned int best_mul;
+	unsigned int cnt_mul;
+	int ret = -EINVAL;
+
+	if (target_speed > I2C_MAX_HIGH_SPEED_MODE_FREQ)
+		target_speed = I2C_MAX_HIGH_SPEED_MODE_FREQ;
+
+	max_step_cnt = mtk_i2c_max_step_cnt(target_speed);
+	base_step_cnt = max_step_cnt;
+	/* Find the best combination */
+	opt_div = DIV_ROUND_UP(clk_src >> 1, target_speed);
+	best_mul = MAX_SAMPLE_CNT_DIV * max_step_cnt;
+
+	/* Search for the best pair (sample_cnt, step_cnt) with
+	 * 0 < sample_cnt < MAX_SAMPLE_CNT_DIV
+	 * 0 < step_cnt < max_step_cnt
+	 * sample_cnt * step_cnt >= opt_div
+	 * optimizing for sample_cnt * step_cnt being minimal
+	 */
+	for (sample_cnt = 1; sample_cnt <= MAX_SAMPLE_CNT_DIV; sample_cnt++) {
+		step_cnt = DIV_ROUND_UP(opt_div, sample_cnt);
+		cnt_mul = step_cnt * sample_cnt;
+		if (step_cnt > max_step_cnt)
+			continue;
+
+		if (cnt_mul < best_mul) {
+			ret = mtk_i2c_check_ac_timing(i2c, clk_src,
+				target_speed, step_cnt - 1, sample_cnt - 1);
+			if (ret)
+				continue;
+
+			best_mul = cnt_mul;
+			base_sample_cnt = sample_cnt;
+			base_step_cnt = step_cnt;
+			if (best_mul == opt_div)
+				break;
+		}
+	}
+
+	if (ret)
+		return -EINVAL;
+
+	sample_cnt = base_sample_cnt;
+	step_cnt = base_step_cnt;
+
+	if ((clk_src / (2 * sample_cnt * step_cnt)) > target_speed) {
+		/* In this case, hardware can't support such
+		 * low i2c_bus_freq
+		 */
+		dev_dbg(i2c->dev, "Unsupported speed (%uhz)\n",	target_speed);
+		return -EINVAL;
+	}
+
+	*timing_step_cnt = step_cnt - 1;
+	*timing_sample_cnt = sample_cnt - 1;
+
+	return 0;
+}
+
+static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
+{
+	unsigned int clk_src;
+	unsigned int step_cnt;
+	unsigned int sample_cnt;
+	unsigned int l_step_cnt;
+	unsigned int l_sample_cnt;
+	unsigned int target_speed;
+	unsigned int clk_div;
+	unsigned int max_clk_div;
+	int ret;
+
+	target_speed = i2c->speed_hz;
+	parent_clk /= i2c->clk_src_div;
+
+	if (i2c->dev_comp->timing_adjust)
+		max_clk_div = MAX_CLOCK_DIV;
+	else
+		max_clk_div = 1;
+
+	for (clk_div = 1; clk_div <= max_clk_div; clk_div++) {
+		clk_src = parent_clk / clk_div;
+
+		if (target_speed > I2C_MAX_FAST_MODE_PLUS_FREQ) {
+			/* Set master code speed register */
+			ret = mtk_i2c_calculate_speed(i2c, clk_src,
+						      I2C_MAX_FAST_MODE_FREQ,
+						      &l_step_cnt,
+						      &l_sample_cnt);
+			if (ret < 0)
+				continue;
+
+			i2c->timing_reg = (l_sample_cnt << 8) | l_step_cnt;
+
+			/* Set the high speed mode register */
+			ret = mtk_i2c_calculate_speed(i2c, clk_src,
+						      target_speed, &step_cnt,
+						      &sample_cnt);
+			if (ret < 0)
+				continue;
+
+			i2c->high_speed_reg = I2C_TIME_DEFAULT_VALUE |
+					(sample_cnt << 12) | (step_cnt << 8);
+
+			if (i2c->dev_comp->ltiming_adjust)
+				i2c->ltiming_reg =
+					(l_sample_cnt << 6) | l_step_cnt |
+					(sample_cnt << 12) | (step_cnt << 9);
+		} else {
+			ret = mtk_i2c_calculate_speed(i2c, clk_src,
+						      target_speed, &l_step_cnt,
+						      &l_sample_cnt);
+			if (ret < 0)
+				continue;
+
+			i2c->timing_reg = (l_sample_cnt << 8) | l_step_cnt;
+
+			/* Disable the high speed transaction */
+			i2c->high_speed_reg = I2C_TIME_CLR_VALUE;
+
+			if (i2c->dev_comp->ltiming_adjust)
+				i2c->ltiming_reg =
+					(l_sample_cnt << 6) | l_step_cnt;
+		}
+
+		break;
+	}
+
+	i2c->ac_timing.inter_clk_div = clk_div - 1;
+
+	return 0;
+}
+
+static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
+			       int num, int left_num)
+{
+	u16 addr_reg;
+	u16 start_reg;
+	u16 control_reg;
+	u16 restart_flag = 0;
+	u16 dma_sync = 0;
+	u32 reg_4g_mode;
+	u8 *dma_rd_buf = NULL;
+	u8 *dma_wr_buf = NULL;
+	dma_addr_t rpaddr = 0;
+	dma_addr_t wpaddr = 0;
+	int ret;
+
+	i2c->irq_stat = 0;
+
+	if (i2c->auto_restart)
+		restart_flag = I2C_RS_TRANSFER;
+
+	reinit_completion(&i2c->msg_complete);
+
+	control_reg = mtk_i2c_readw(i2c, OFFSET_CONTROL) &
+			~(I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS);
+	if ((i2c->speed_hz > I2C_MAX_FAST_MODE_PLUS_FREQ) || (left_num >= 1))
+		control_reg |= I2C_CONTROL_RS;
+
+	if (i2c->op == I2C_MASTER_WRRD)
+		control_reg |= I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS;
+
+	mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL);
+
+	addr_reg = i2c_8bit_addr_from_msg(msgs);
+	mtk_i2c_writew(i2c, addr_reg, OFFSET_SLAVE_ADDR);
+
+	/* Clear interrupt status */
+	mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
+			    I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_STAT);
+
+	mtk_i2c_writew(i2c, I2C_FIFO_ADDR_CLR, OFFSET_FIFO_ADDR_CLR);
+
+	/* Enable interrupt */
+	mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
+			    I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_MASK);
+
+	/* Set transfer and transaction len */
+	if (i2c->op == I2C_MASTER_WRRD) {
+		if (i2c->dev_comp->aux_len_reg) {
+			mtk_i2c_writew(i2c, msgs->len, OFFSET_TRANSFER_LEN);
+			mtk_i2c_writew(i2c, (msgs + 1)->len,
+					    OFFSET_TRANSFER_LEN_AUX);
+		} else {
+			mtk_i2c_writew(i2c, msgs->len | ((msgs + 1)->len) << 8,
+					    OFFSET_TRANSFER_LEN);
+		}
+		mtk_i2c_writew(i2c, I2C_WRRD_TRANAC_VALUE, OFFSET_TRANSAC_LEN);
+	} else {
+		mtk_i2c_writew(i2c, msgs->len, OFFSET_TRANSFER_LEN);
+		mtk_i2c_writew(i2c, num, OFFSET_TRANSAC_LEN);
+	}
+
+	if (i2c->dev_comp->apdma_sync) {
+		dma_sync = I2C_DMA_SKIP_CONFIG | I2C_DMA_ASYNC_MODE;
+		if (i2c->op == I2C_MASTER_WRRD)
+			dma_sync |= I2C_DMA_DIR_CHANGE;
+	}
+
+	/* Prepare buffer data to start transfer */
+	if (i2c->op == I2C_MASTER_RD) {
+		writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
+		writel(I2C_DMA_CON_RX | dma_sync, i2c->pdmabase + OFFSET_CON);
+
+		dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
+		if (!dma_rd_buf)
+			return -ENOMEM;
+
+		rpaddr = dma_map_single(i2c->dev, dma_rd_buf,
+					msgs->len, DMA_FROM_DEVICE);
+		if (dma_mapping_error(i2c->dev, rpaddr)) {
+			i2c_put_dma_safe_msg_buf(dma_rd_buf, msgs, false);
+
+			return -ENOMEM;
+		}
+
+		if (i2c->dev_comp->max_dma_support > 32) {
+			reg_4g_mode = upper_32_bits(rpaddr);
+			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
+		}
+
+		writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR);
+		writel(msgs->len, i2c->pdmabase + OFFSET_RX_LEN);
+	} else if (i2c->op == I2C_MASTER_WR) {
+		writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
+		writel(I2C_DMA_CON_TX | dma_sync, i2c->pdmabase + OFFSET_CON);
+
+		dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
+		if (!dma_wr_buf)
+			return -ENOMEM;
+
+		wpaddr = dma_map_single(i2c->dev, dma_wr_buf,
+					msgs->len, DMA_TO_DEVICE);
+		if (dma_mapping_error(i2c->dev, wpaddr)) {
+			i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
+
+			return -ENOMEM;
+		}
+
+		if (i2c->dev_comp->max_dma_support > 32) {
+			reg_4g_mode = upper_32_bits(wpaddr);
+			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
+		}
+
+		writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR);
+		writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN);
+	} else {
+		writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG);
+		writel(I2C_DMA_CLR_FLAG | dma_sync, i2c->pdmabase + OFFSET_CON);
+
+		dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
+		if (!dma_wr_buf)
+			return -ENOMEM;
+
+		wpaddr = dma_map_single(i2c->dev, dma_wr_buf,
+					msgs->len, DMA_TO_DEVICE);
+		if (dma_mapping_error(i2c->dev, wpaddr)) {
+			i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
+
+			return -ENOMEM;
+		}
+
+		dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 1);
+		if (!dma_rd_buf) {
+			dma_unmap_single(i2c->dev, wpaddr,
+					 msgs->len, DMA_TO_DEVICE);
+
+			i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
+
+			return -ENOMEM;
+		}
+
+		rpaddr = dma_map_single(i2c->dev, dma_rd_buf,
+					(msgs + 1)->len,
+					DMA_FROM_DEVICE);
+		if (dma_mapping_error(i2c->dev, rpaddr)) {
+			dma_unmap_single(i2c->dev, wpaddr,
+					 msgs->len, DMA_TO_DEVICE);
+
+			i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
+			i2c_put_dma_safe_msg_buf(dma_rd_buf, (msgs + 1), false);
+
+			return -ENOMEM;
+		}
+
+		if (i2c->dev_comp->max_dma_support > 32) {
+			reg_4g_mode = upper_32_bits(wpaddr);
+			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
+
+			reg_4g_mode = upper_32_bits(rpaddr);
+			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
+		}
+
+		writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR);
+		writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR);
+		writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN);
+		writel((msgs + 1)->len, i2c->pdmabase + OFFSET_RX_LEN);
+	}
+
+	writel(I2C_DMA_START_EN, i2c->pdmabase + OFFSET_EN);
+
+	if (!i2c->auto_restart) {
+		start_reg = I2C_TRANSAC_START;
+	} else {
+		start_reg = I2C_TRANSAC_START | I2C_RS_MUL_TRIG;
+		if (left_num >= 1)
+			start_reg |= I2C_RS_MUL_CNFG;
+	}
+	mtk_i2c_writew(i2c, start_reg, OFFSET_START);
+
+	ret = wait_for_completion_timeout(&i2c->msg_complete,
+					  i2c->adap.timeout);
+
+	/* Clear interrupt mask */
+	mtk_i2c_writew(i2c, ~(restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
+			    I2C_ARB_LOST | I2C_TRANSAC_COMP), OFFSET_INTR_MASK);
+
+	if (i2c->op == I2C_MASTER_WR) {
+		dma_unmap_single(i2c->dev, wpaddr,
+				 msgs->len, DMA_TO_DEVICE);
+
+		i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, true);
+	} else if (i2c->op == I2C_MASTER_RD) {
+		dma_unmap_single(i2c->dev, rpaddr,
+				 msgs->len, DMA_FROM_DEVICE);
+
+		i2c_put_dma_safe_msg_buf(dma_rd_buf, msgs, true);
+	} else {
+		dma_unmap_single(i2c->dev, wpaddr, msgs->len,
+				 DMA_TO_DEVICE);
+		dma_unmap_single(i2c->dev, rpaddr, (msgs + 1)->len,
+				 DMA_FROM_DEVICE);
+
+		i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, true);
+		i2c_put_dma_safe_msg_buf(dma_rd_buf, (msgs + 1), true);
+	}
+
+	if (ret == 0) {
+		dev_dbg(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr);
+		mtk_i2c_init_hw(i2c);
+		return -ETIMEDOUT;
+	}
+
+	if (i2c->irq_stat & (I2C_HS_NACKERR | I2C_ACKERR)) {
+		dev_dbg(i2c->dev, "addr: %x, transfer ACK error\n", msgs->addr);
+		mtk_i2c_init_hw(i2c);
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int mtk_i2c_transfer(struct i2c_adapter *adap,
+			    struct i2c_msg msgs[], int num)
+{
+	int ret;
+	int left_num = num;
+	struct mtk_i2c *i2c = i2c_get_adapdata(adap);
+
+	ret = mtk_i2c_clock_enable(i2c);
+	if (ret)
+		return ret;
+
+	i2c->auto_restart = i2c->dev_comp->auto_restart;
+
+	/* checking if we can skip restart and optimize using WRRD mode */
+	if (i2c->auto_restart && num == 2) {
+		if (!(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD) &&
+		    msgs[0].addr == msgs[1].addr) {
+			i2c->auto_restart = 0;
+		}
+	}
+
+	if (i2c->auto_restart && num >= 2 &&
+		i2c->speed_hz > I2C_MAX_FAST_MODE_PLUS_FREQ)
+		/* ignore the first restart irq after the master code,
+		 * otherwise the first transfer will be discarded.
+		 */
+		i2c->ignore_restart_irq = true;
+	else
+		i2c->ignore_restart_irq = false;
+
+	while (left_num--) {
+		if (!msgs->buf) {
+			dev_dbg(i2c->dev, "data buffer is NULL.\n");
+			ret = -EINVAL;
+			goto err_exit;
+		}
+
+		if (msgs->flags & I2C_M_RD)
+			i2c->op = I2C_MASTER_RD;
+		else
+			i2c->op = I2C_MASTER_WR;
+
+		if (!i2c->auto_restart) {
+			if (num > 1) {
+				/* combined two messages into one transaction */
+				i2c->op = I2C_MASTER_WRRD;
+				left_num--;
+			}
+		}
+
+		/* always use DMA mode. */
+		ret = mtk_i2c_do_transfer(i2c, msgs, num, left_num);
+		if (ret < 0)
+			goto err_exit;
+
+		msgs++;
+	}
+	/* the return value is number of executed messages */
+	ret = num;
+
+err_exit:
+	mtk_i2c_clock_disable(i2c);
+	return ret;
+}
+
+static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id)
+{
+	struct mtk_i2c *i2c = dev_id;
+	u16 restart_flag = 0;
+	u16 intr_stat;
+
+	if (i2c->auto_restart)
+		restart_flag = I2C_RS_TRANSFER;
+
+	intr_stat = mtk_i2c_readw(i2c, OFFSET_INTR_STAT);
+	mtk_i2c_writew(i2c, intr_stat, OFFSET_INTR_STAT);
+
+	/*
+	 * when occurs ack error, i2c controller generate two interrupts
+	 * first is the ack error interrupt, then the complete interrupt
+	 * i2c->irq_stat need keep the two interrupt value.
+	 */
+	i2c->irq_stat |= intr_stat;
+
+	if (i2c->ignore_restart_irq && (i2c->irq_stat & restart_flag)) {
+		i2c->ignore_restart_irq = false;
+		i2c->irq_stat = 0;
+		mtk_i2c_writew(i2c, I2C_RS_MUL_CNFG | I2C_RS_MUL_TRIG |
+				    I2C_TRANSAC_START, OFFSET_START);
+	} else {
+		if (i2c->irq_stat & (I2C_TRANSAC_COMP | restart_flag))
+			complete(&i2c->msg_complete);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static u32 mtk_i2c_functionality(struct i2c_adapter *adap)
+{
+	if (i2c_check_quirks(adap, I2C_AQ_NO_ZERO_LEN))
+		return I2C_FUNC_I2C |
+			(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
+	else
+		return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm mtk_i2c_algorithm = {
+	.master_xfer = mtk_i2c_transfer,
+	.functionality = mtk_i2c_functionality,
+};
+
+static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c)
+{
+	int ret;
+
+	ret = of_property_read_u32(np, "clock-frequency", &i2c->speed_hz);
+	if (ret < 0)
+		i2c->speed_hz = I2C_MAX_STANDARD_MODE_FREQ;
+
+	ret = of_property_read_u32(np, "clock-div", &i2c->clk_src_div);
+	if (ret < 0)
+		return ret;
+
+	if (i2c->clk_src_div == 0)
+		return -EINVAL;
+
+	i2c->have_pmic = of_property_read_bool(np, "mediatek,have-pmic");
+	i2c->use_push_pull =
+		of_property_read_bool(np, "mediatek,use-push-pull");
+
+	return 0;
+}
+
+static int mtk_i2c_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct mtk_i2c *i2c;
+	struct clk *clk;
+	struct resource *res;
+	int irq;
+
+	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+	if (!i2c)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	i2c->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(i2c->base))
+		return PTR_ERR(i2c->base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	i2c->pdmabase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(i2c->pdmabase))
+		return PTR_ERR(i2c->pdmabase);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	init_completion(&i2c->msg_complete);
+
+	i2c->dev_comp = of_device_get_match_data(&pdev->dev);
+	i2c->adap.dev.of_node = pdev->dev.of_node;
+	i2c->dev = &pdev->dev;
+	i2c->adap.dev.parent = &pdev->dev;
+	i2c->adap.owner = THIS_MODULE;
+	i2c->adap.algo = &mtk_i2c_algorithm;
+	i2c->adap.quirks = i2c->dev_comp->quirks;
+	i2c->adap.timeout = 2 * HZ;
+	i2c->adap.retries = 1;
+
+	ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c);
+	if (ret)
+		return -EINVAL;
+
+	if (i2c->have_pmic && !i2c->dev_comp->pmic_i2c)
+		return -EINVAL;
+
+	i2c->clk_main = devm_clk_get(&pdev->dev, "main");
+	if (IS_ERR(i2c->clk_main)) {
+		dev_err(&pdev->dev, "cannot get main clock\n");
+		return PTR_ERR(i2c->clk_main);
+	}
+
+	i2c->clk_dma = devm_clk_get(&pdev->dev, "dma");
+	if (IS_ERR(i2c->clk_dma)) {
+		dev_err(&pdev->dev, "cannot get dma clock\n");
+		return PTR_ERR(i2c->clk_dma);
+	}
+
+	i2c->clk_arb = devm_clk_get(&pdev->dev, "arb");
+	if (IS_ERR(i2c->clk_arb))
+		i2c->clk_arb = NULL;
+
+	clk = i2c->clk_main;
+	if (i2c->have_pmic) {
+		i2c->clk_pmic = devm_clk_get(&pdev->dev, "pmic");
+		if (IS_ERR(i2c->clk_pmic)) {
+			dev_err(&pdev->dev, "cannot get pmic clock\n");
+			return PTR_ERR(i2c->clk_pmic);
+		}
+		clk = i2c->clk_pmic;
+	}
+
+	strlcpy(i2c->adap.name, I2C_DRV_NAME, sizeof(i2c->adap.name));
+
+	ret = mtk_i2c_set_speed(i2c, clk_get_rate(clk));
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to set the speed.\n");
+		return -EINVAL;
+	}
+
+	if (i2c->dev_comp->max_dma_support > 32) {
+		ret = dma_set_mask(&pdev->dev,
+				DMA_BIT_MASK(i2c->dev_comp->max_dma_support));
+		if (ret) {
+			dev_err(&pdev->dev, "dma_set_mask return error.\n");
+			return ret;
+		}
+	}
+
+	ret = mtk_i2c_clock_enable(i2c);
+	if (ret) {
+		dev_err(&pdev->dev, "clock enable failed!\n");
+		return ret;
+	}
+	mtk_i2c_init_hw(i2c);
+	mtk_i2c_clock_disable(i2c);
+
+	ret = devm_request_irq(&pdev->dev, irq, mtk_i2c_irq,
+			       IRQF_NO_SUSPEND | IRQF_TRIGGER_NONE,
+			       I2C_DRV_NAME, i2c);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"Request I2C IRQ %d fail\n", irq);
+		return ret;
+	}
+
+	i2c_set_adapdata(&i2c->adap, i2c);
+	ret = i2c_add_adapter(&i2c->adap);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, i2c);
+
+	return 0;
+}
+
+static int mtk_i2c_remove(struct platform_device *pdev)
+{
+	struct mtk_i2c *i2c = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&i2c->adap);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_i2c_suspend_noirq(struct device *dev)
+{
+	struct mtk_i2c *i2c = dev_get_drvdata(dev);
+
+	i2c_mark_adapter_suspended(&i2c->adap);
+
+	return 0;
+}
+
+static int mtk_i2c_resume_noirq(struct device *dev)
+{
+	int ret;
+	struct mtk_i2c *i2c = dev_get_drvdata(dev);
+
+	ret = mtk_i2c_clock_enable(i2c);
+	if (ret) {
+		dev_err(dev, "clock enable failed!\n");
+		return ret;
+	}
+
+	mtk_i2c_init_hw(i2c);
+
+	mtk_i2c_clock_disable(i2c);
+
+	i2c_mark_adapter_resumed(&i2c->adap);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops mtk_i2c_pm = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_i2c_suspend_noirq,
+				      mtk_i2c_resume_noirq)
+};
+
+static struct platform_driver mtk_i2c_driver = {
+	.probe = mtk_i2c_probe,
+	.remove = mtk_i2c_remove,
+	.driver = {
+		.name = I2C_DRV_NAME,
+		.pm = &mtk_i2c_pm,
+		.of_match_table = of_match_ptr(mtk_i2c_of_match),
+	},
+};
+
+module_platform_driver(mtk_i2c_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek I2C Bus Driver");
+MODULE_AUTHOR("Xudong Chen <xudong.chen@mediatek.com>");