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i2c: mediatek: Add i2c and apdma sync in i2c driver

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When i2c and apdma use different source clocks, we should enable
synchronization between them.

Signed-off-by: Qii Wang <qii.wang@mediatek.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Qii Wang 2019-04-02 20:35:58 +08:00 committed by Wolfram Sang
parent cad6dc5d28
commit a15c91bac6
1 changed files with 11 additions and 0 deletions
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11
drivers/i2c/busses/i2c-mt65xx.c
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@ -77,6 +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"
@ -169,6 +171,7 @@ 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 {
@ -218,6 +221,7 @@ static const struct mtk_i2c_compatible mt2712_compat = {
.aux_len_reg = 1,
.support_33bits = 1,
.timing_adjust = 1,
.dma_sync = 0,
};
static const struct mtk_i2c_compatible mt6577_compat = {
@ -229,6 +233,7 @@ static const struct mtk_i2c_compatible mt6577_compat = {
.aux_len_reg = 0,
.support_33bits = 0,
.timing_adjust = 0,
.dma_sync = 0,
};
static const struct mtk_i2c_compatible mt6589_compat = {
@ -240,6 +245,7 @@ static const struct mtk_i2c_compatible mt6589_compat = {
.aux_len_reg = 0,
.support_33bits = 0,
.timing_adjust = 0,
.dma_sync = 0,
};
static const struct mtk_i2c_compatible mt7622_compat = {
@ -251,6 +257,7 @@ static const struct mtk_i2c_compatible mt7622_compat = {
.aux_len_reg = 1,
.support_33bits = 0,
.timing_adjust = 0,
.dma_sync = 0,
};
static const struct mtk_i2c_compatible mt8173_compat = {
@ -261,6 +268,7 @@ static const struct mtk_i2c_compatible mt8173_compat = {
.aux_len_reg = 1,
.support_33bits = 1,
.timing_adjust = 0,
.dma_sync = 0,
};
static const struct of_device_id mtk_i2c_of_match[] = {
@ -360,6 +368,9 @@ 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);