[PATCH 6/6] i2c: mediatek: Add i2c support for MediaTek MT8183

From: qii wang
Date: Fri Dec 21 2018 - 07:59:29 EST

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Add i2c compatible for MT8183. Compare to 2712 i2c controller, MT8183 has
different registers, offsets, clock, and multi-user function.

Signed-off-by: qii wang <qii.wang@xxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-mt65xx.c | 127 ++++++++++++++++++++++++++++++++++++---
1 file changed, 120 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index 428ac99..19f0770 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -35,17 +35,21 @@
#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_HS_TIME_EN (1 << 7)
#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_FIFO_ADDR_CLR 0x0001
+#define I2C_FIFO_ADDR_CLRH 0x0002
+#define I2C_HFIFO_DATA 0x8208
#define I2C_DELAY_LEN 0x0002
#define I2C_ST_START_CON 0x8001
#define I2C_FS_START_CON 0x1800
@@ -76,6 +80,8 @@
#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 +136,15 @@ enum I2C_REGS_OFFSET {
OFFSET_DEBUGCTRL,
OFFSET_TRANSFER_LEN_AUX,
OFFSET_CLOCK_DIV,
+ /* MT8183 only regs */
+ OFFSET_LTIMING,
+ OFFSET_DATA_TIMING,
+ OFFSET_MCU_INTR,
+ OFFSET_HW_TIMEOUT,
+ OFFSET_HFIFO_DATA,
+ OFFSET_HFIFO_STAT,
+ OFFSET_MULTI_DMA,
+ OFFSET_ROLLBACK,
};

static const u16 mt_i2c_regs_v1[] = {
@@ -159,6 +174,39 @@ 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_DATA_TIMING] = 0x3c,
+ [OFFSET_MCU_INTR] = 0x40,
+ [OFFSET_TRANSFER_LEN_AUX] = 0x44,
+ [OFFSET_CLOCK_DIV] = 0x48,
+ [OFFSET_HW_TIMEOUT] = 0x4c,
+ [OFFSET_SOFTRESET] = 0x50,
+ [OFFSET_HFIFO_DATA] = 0x70,
+ [OFFSET_DEBUGSTAT] = 0xe0,
+ [OFFSET_DEBUGCTRL] = 0xe8,
+ [OFFSET_FIFO_STAT] = 0xf4,
+ [OFFSET_FIFO_THRESH] = 0xf8,
+ [OFFSET_HFIFO_STAT] = 0xfc,
+ [OFFSET_DCM_EN] = 0xf88,
+ [OFFSET_MULTI_DMA] = 0xf8c,
+ [OFFSET_ROLLBACK] = 0xf98,
+};
+
struct mtk_i2c_compatible {
const struct i2c_adapter_quirks *quirks;
const u16 *regs;
@@ -168,6 +216,7 @@ 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 {
@@ -181,8 +230,10 @@ 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 */
+ bool share_i3c; /* share i3c IP */

u16 irq_stat; /* interrupt status */
unsigned int clk_src_div;
@@ -190,6 +241,7 @@ 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 +268,7 @@ 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 +280,7 @@ 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 +292,7 @@ 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 +304,7 @@ 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 +315,18 @@ 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 +335,7 @@ 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 +368,18 @@ 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 +390,9 @@ 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);

@@ -333,11 +415,19 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
if (i2c->dev_comp->dcm)
mtk_i2c_writew(i2c, I2C_DCM_DISABLE, OFFSET_DCM_EN);

- if (i2c->dev_comp->timing_adjust)
+ if (i2c->dev_comp->timing_adjust && i2c->share_i3c) {
+ mtk_i2c_writew(i2c, (I2C_DEFAULT_CLK_DIV - 1) |
+ (I2C_DEFAULT_CLK_DIV - 1) << 8,
+ OFFSET_CLOCK_DIV);
+ i2c->high_speed_reg |= I2C_HS_TIME_EN;
+ } else {
mtk_i2c_writew(i2c, I2C_DEFAULT_CLK_DIV - 1, OFFSET_CLOCK_DIV);
+ }

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 +435,9 @@ 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 +527,8 @@ 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 +538,11 @@ 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 +552,8 @@ 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 +564,8 @@ 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;
@@ -483,6 +582,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
u16 addr_reg;
u16 start_reg;
u16 control_reg;
+ u16 fifo_clr_reg = I2C_FIFO_ADDR_CLR;
u16 restart_flag = 0;
u32 reg_4g_mode;
u8 *dma_rd_buf = NULL;
@@ -519,13 +619,21 @@ 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);
+
+ if (i2c->share_i3c)
+ fifo_clr_reg |= I2C_FIFO_ADDR_CLRH;

- mtk_i2c_writew(i2c, I2C_FIFO_ADDR_CLR, OFFSET_FIFO_ADDR_CLR);
+ mtk_i2c_writew(i2c, fifo_clr_reg, OFFSET_FIFO_ADDR_CLR);
+
+ if ((i2c->speed_hz > MAX_FS_MODE_SPEED) && i2c->share_i3c)
+ mtk_i2c_writew(i2c, I2C_HFIFO_DATA, OFFSET_HFIFO_DATA);

/* 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 +767,7 @@ 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,
@@ -817,6 +925,7 @@ static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c)
if (i2c->clk_src_div == 0)
return -EINVAL;

+ i2c->share_i3c = of_property_read_bool(np, "mediatek,share-i3c");
i2c->have_pmic = of_property_read_bool(np, "mediatek,have-pmic");
i2c->use_push_pull =
of_property_read_bool(np, "mediatek,use-push-pull");
@@ -884,6 +993,10 @@ 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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