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Date:   Wed, 20 Feb 2019 20:33:50 +0800
From:   Qii Wang <qii.wang@...iatek.com>
To:     <wsa@...-dreams.de>
CC:     <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <leilk.liu@...iatek.com>,
        <qii.wang@...iatek.com>, <xinping.qian@...iatek.com>,
        <liguo.zhang@...iatek.com>, <robh@...nel.org>
Subject: [PATCH v4 3/3] i2c: mediatek: Add i2c support for MediaTek MT8183

Add i2c compatible for MT8183. Compare to MT2712 i2c controller,
MT8183 has different registers, offsets and clock.

Signed-off-by: Qii Wang <qii.wang@...iatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c |   89 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 84 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index 428ac99..82eedbd 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -35,6 +35,7 @@
 #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)
@@ -76,6 +77,8 @@
 #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"
@@ -130,6 +133,8 @@ enum I2C_REGS_OFFSET {
 	OFFSET_DEBUGCTRL,
 	OFFSET_TRANSFER_LEN_AUX,
 	OFFSET_CLOCK_DIV,
+	/* MT8183 only regs */
+	OFFSET_LTIMING,
 };
 
 static const u16 mt_i2c_regs_v1[] = {
@@ -159,6 +164,32 @@ enum I2C_REGS_OFFSET {
 	[OFFSET_CLOCK_DIV] = 0x70,
 };
 
+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_TRANSFER_LEN_AUX] = 0x44,
+	[OFFSET_CLOCK_DIV] = 0x48,
+	[OFFSET_SOFTRESET] = 0x50,
+	[OFFSET_DEBUGSTAT] = 0xe0,
+	[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;
@@ -168,6 +199,7 @@ struct mtk_i2c_compatible {
 	unsigned char aux_len_reg: 1;
 	unsigned char support_33bits: 1;
 	unsigned char timing_adjust: 1;
+	unsigned char dma_sync: 1;
 };
 
 struct mtk_i2c {
@@ -181,6 +213,7 @@ struct mtk_i2c {
 	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 */
 
@@ -190,6 +223,7 @@ struct mtk_i2c {
 	enum mtk_trans_op op;
 	u16 timing_reg;
 	u16 high_speed_reg;
+	u16 ltiming_reg;
 	unsigned char auto_restart;
 	bool ignore_restart_irq;
 	const struct mtk_i2c_compatible *dev_comp;
@@ -216,6 +250,7 @@ struct mtk_i2c {
 	.aux_len_reg = 1,
 	.support_33bits = 1,
 	.timing_adjust = 1,
+	.dma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt6577_compat = {
@@ -227,6 +262,7 @@ struct mtk_i2c {
 	.aux_len_reg = 0,
 	.support_33bits = 0,
 	.timing_adjust = 0,
+	.dma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt6589_compat = {
@@ -238,6 +274,7 @@ struct mtk_i2c {
 	.aux_len_reg = 0,
 	.support_33bits = 0,
 	.timing_adjust = 0,
+	.dma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt7622_compat = {
@@ -249,6 +286,7 @@ struct mtk_i2c {
 	.aux_len_reg = 1,
 	.support_33bits = 0,
 	.timing_adjust = 0,
+	.dma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt8173_compat = {
@@ -259,6 +297,18 @@ struct mtk_i2c {
 	.aux_len_reg = 1,
 	.support_33bits = 1,
 	.timing_adjust = 0,
+	.dma_sync = 0,
+};
+
+static const struct mtk_i2c_compatible mt8183_compat = {
+	.regs = mt_i2c_regs_v2,
+	.pmic_i2c = 0,
+	.dcm = 0,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.support_33bits = 1,
+	.timing_adjust = 1,
+	.dma_sync = 1,
 };
 
 static const struct of_device_id mtk_i2c_of_match[] = {
@@ -267,6 +317,7 @@ struct mtk_i2c {
 	{ .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 },
 	{}
 };
 MODULE_DEVICE_TABLE(of, mtk_i2c_of_match);
@@ -299,8 +350,18 @@ static int mtk_i2c_clock_enable(struct mtk_i2c *i2c)
 		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:
@@ -311,6 +372,9 @@ static int mtk_i2c_clock_enable(struct mtk_i2c *i2c)
 
 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);
 
@@ -338,6 +402,8 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
 
 	mtk_i2c_writew(i2c, i2c->timing_reg, OFFSET_TIMING);
 	mtk_i2c_writew(i2c, i2c->high_speed_reg, OFFSET_HS);
+	if (i2c->dev_comp->regs == mt_i2c_regs_v2)
+		mtk_i2c_writew(i2c, i2c->ltiming_reg, OFFSET_LTIMING);
 
 	/* If use i2c pin from PMIC mt6397 side, need set PATH_DIR first */
 	if (i2c->have_pmic)
@@ -345,6 +411,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
 
 	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);
 
@@ -434,6 +503,8 @@ 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;
 	int ret;
 
@@ -443,11 +514,11 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
 	if (target_speed > MAX_FS_MODE_SPEED) {
 		/* Set master code speed register */
 		ret = mtk_i2c_calculate_speed(i2c, clk_src, MAX_FS_MODE_SPEED,
-					      &step_cnt, &sample_cnt);
+					      &l_step_cnt, &l_sample_cnt);
 		if (ret < 0)
 			return ret;
 
-		i2c->timing_reg = (sample_cnt << 8) | step_cnt;
+		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,
@@ -457,6 +528,8 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
 
 		i2c->high_speed_reg = I2C_TIME_DEFAULT_VALUE |
 			(sample_cnt << 12) | (step_cnt << 8);
+		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,
 					      &step_cnt, &sample_cnt);
@@ -467,6 +540,8 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
 
 		/* Disable the high speed transaction */
 		i2c->high_speed_reg = I2C_TIME_CLR_VALUE;
+
+		i2c->ltiming_reg = (sample_cnt << 6) | step_cnt;
 	}
 
 	return 0;
@@ -519,13 +594,13 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 
 	/* Clear interrupt status */
 	mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
-	       I2C_TRANSAC_COMP, OFFSET_INTR_STAT);
+			    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_TRANSAC_COMP, OFFSET_INTR_MASK);
+			    I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_MASK);
 
 	/* Set transfer and transaction len */
 	if (i2c->op == I2C_MASTER_WRRD) {
@@ -659,7 +734,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 
 	/* Clear interrupt mask */
 	mtk_i2c_writew(i2c, ~(restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
-	       I2C_TRANSAC_COMP), OFFSET_INTR_MASK);
+			    I2C_ARB_LOST | I2C_TRANSAC_COMP), OFFSET_INTR_MASK);
 
 	if (i2c->op == I2C_MASTER_WR) {
 		dma_unmap_single(i2c->dev, wpaddr,
@@ -884,6 +959,10 @@ static int mtk_i2c_probe(struct platform_device *pdev)
 		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");
-- 
1.7.9.5

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