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-rw-r--r--drivers/i2c/busses/i2c-tegra.c97
1 files changed, 95 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index f445b05accfa..15772964a05f 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -40,6 +40,7 @@
#define I2C_SL_CNFG_NEWSL BIT(2)
#define I2C_SL_ADDR1 0x02c
#define I2C_SL_ADDR2 0x030
+#define I2C_TLOW_SEXT 0x034
#define I2C_TX_FIFO 0x050
#define I2C_RX_FIFO 0x054
#define I2C_PACKET_TRANSFER_STATUS 0x058
@@ -109,6 +110,18 @@
#define I2C_INTERFACE_TIMING_THIGH GENMASK(13, 8)
#define I2C_INTERFACE_TIMING_TLOW GENMASK(5, 0)
#define I2C_INTERFACE_TIMING_1 0x098
+#define I2C_INTERFACE_TIMING_TBUF GENMASK(29, 24)
+#define I2C_INTERFACE_TIMING_TSU_STO GENMASK(21, 16)
+#define I2C_INTERFACE_TIMING_THD_STA GENMASK(13, 8)
+#define I2C_INTERFACE_TIMING_TSU_STA GENMASK(5, 0)
+
+#define I2C_HS_INTERFACE_TIMING_0 0x09c
+#define I2C_HS_INTERFACE_TIMING_THIGH GENMASK(13, 8)
+#define I2C_HS_INTERFACE_TIMING_TLOW GENMASK(5, 0)
+#define I2C_HS_INTERFACE_TIMING_1 0x0a0
+#define I2C_HS_INTERFACE_TIMING_TSU_STO GENMASK(21, 16)
+#define I2C_HS_INTERFACE_TIMING_THD_STA GENMASK(13, 8)
+#define I2C_HS_INTERFACE_TIMING_TSU_STA GENMASK(5, 0)
#define I2C_MST_FIFO_CONTROL 0x0b4
#define I2C_MST_FIFO_CONTROL_RX_FLUSH BIT(0)
@@ -230,6 +243,7 @@ struct tegra_i2c_hw_feature {
* @cont_id: I2C controller ID, used for packet header
* @irq: IRQ number of transfer complete interrupt
* @is_dvc: identifies the DVC I2C controller, has a different register layout
+ * @is_vi: identifies the VI I2C controller, has a different register layout
* @msg_complete: transfer completion notifier
* @msg_err: error code for completed message
* @msg_buf: pointer to current message data
@@ -253,12 +267,14 @@ struct tegra_i2c_dev {
struct i2c_adapter adapter;
struct clk *div_clk;
struct clk *fast_clk;
+ struct clk *slow_clk;
struct reset_control *rst;
void __iomem *base;
phys_addr_t base_phys;
int cont_id;
int irq;
int is_dvc;
+ bool is_vi;
struct completion msg_complete;
int msg_err;
u8 *msg_buf;
@@ -297,6 +313,8 @@ static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
{
if (i2c_dev->is_dvc)
reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
+ else if (i2c_dev->is_vi)
+ reg = 0xc00 + (reg << 2);
return reg;
}
@@ -646,6 +664,14 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
}
}
+ if (i2c_dev->slow_clk) {
+ ret = clk_enable(i2c_dev->slow_clk);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable slow clock: %d\n", ret);
+ return ret;
+ }
+ }
+
ret = clk_enable(i2c_dev->div_clk);
if (ret < 0) {
dev_err(i2c_dev->dev,
@@ -662,6 +688,10 @@ static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
clk_disable(i2c_dev->div_clk);
+
+ if (i2c_dev->slow_clk)
+ clk_disable(i2c_dev->slow_clk);
+
if (!i2c_dev->hw->has_single_clk_source)
clk_disable(i2c_dev->fast_clk);
@@ -699,6 +729,35 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
return 0;
}
+static void tegra_i2c_vi_init(struct tegra_i2c_dev *i2c_dev)
+{
+ u32 value;
+
+ value = FIELD_PREP(I2C_INTERFACE_TIMING_THIGH, 2) |
+ FIELD_PREP(I2C_INTERFACE_TIMING_TLOW, 4);
+ i2c_writel(i2c_dev, value, I2C_INTERFACE_TIMING_0);
+
+ value = FIELD_PREP(I2C_INTERFACE_TIMING_TBUF, 4) |
+ FIELD_PREP(I2C_INTERFACE_TIMING_TSU_STO, 7) |
+ FIELD_PREP(I2C_INTERFACE_TIMING_THD_STA, 4) |
+ FIELD_PREP(I2C_INTERFACE_TIMING_TSU_STA, 4);
+ i2c_writel(i2c_dev, value, I2C_INTERFACE_TIMING_1);
+
+ value = FIELD_PREP(I2C_HS_INTERFACE_TIMING_THIGH, 3) |
+ FIELD_PREP(I2C_HS_INTERFACE_TIMING_TLOW, 8);
+ i2c_writel(i2c_dev, value, I2C_HS_INTERFACE_TIMING_0);
+
+ value = FIELD_PREP(I2C_HS_INTERFACE_TIMING_TSU_STO, 11) |
+ FIELD_PREP(I2C_HS_INTERFACE_TIMING_THD_STA, 11) |
+ FIELD_PREP(I2C_HS_INTERFACE_TIMING_TSU_STA, 11);
+ i2c_writel(i2c_dev, value, I2C_HS_INTERFACE_TIMING_1);
+
+ value = FIELD_PREP(I2C_BC_SCLK_THRESHOLD, 9) | I2C_BC_STOP_COND;
+ i2c_writel(i2c_dev, value, I2C_BUS_CLEAR_CNFG);
+
+ i2c_writel(i2c_dev, 0x0, I2C_TLOW_SEXT);
+}
+
static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
{
u32 val;
@@ -723,6 +782,9 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
i2c_writel(i2c_dev, val, I2C_CNFG);
i2c_writel(i2c_dev, 0, I2C_INT_MASK);
+ if (i2c_dev->is_vi)
+ tegra_i2c_vi_init(i2c_dev);
+
/* Make sure clock divisor programmed correctly */
clk_divisor = FIELD_PREP(I2C_CLK_DIVISOR_HSMODE,
i2c_dev->hw->clk_divisor_hs_mode) |
@@ -766,7 +828,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
}
}
- if (!i2c_dev->is_dvc) {
+ if (!i2c_dev->is_dvc && !i2c_dev->is_vi) {
u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);
sl_cfg |= I2C_SL_CNFG_NACK | I2C_SL_CNFG_NEWSL;
@@ -1555,6 +1617,7 @@ static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
static const struct of_device_id tegra_i2c_of_match[] = {
{ .compatible = "nvidia,tegra194-i2c", .data = &tegra194_i2c_hw, },
{ .compatible = "nvidia,tegra186-i2c", .data = &tegra186_i2c_hw, },
+ { .compatible = "nvidia,tegra210-i2c-vi", .data = &tegra210_i2c_hw, },
{ .compatible = "nvidia,tegra210-i2c", .data = &tegra210_i2c_hw, },
{ .compatible = "nvidia,tegra124-i2c", .data = &tegra124_i2c_hw, },
{ .compatible = "nvidia,tegra114-i2c", .data = &tegra114_i2c_hw, },
@@ -1567,6 +1630,7 @@ MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);
static int tegra_i2c_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct tegra_i2c_dev *i2c_dev;
struct resource *res;
struct clk *div_clk;
@@ -1622,6 +1686,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->hw = of_device_get_match_data(&pdev->dev);
i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node,
"nvidia,tegra20-i2c-dvc");
+ i2c_dev->is_vi = of_device_is_compatible(dev->of_node,
+ "nvidia,tegra210-i2c-vi");
i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
i2c_dev->dma_buf_size = i2c_dev->adapter.quirks->max_write_len +
I2C_PACKET_HEADER_SIZE;
@@ -1637,6 +1703,17 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->fast_clk = fast_clk;
}
+ if (i2c_dev->is_vi) {
+ i2c_dev->slow_clk = devm_clk_get(dev, "slow");
+ if (IS_ERR(i2c_dev->slow_clk)) {
+ if (PTR_ERR(i2c_dev->slow_clk) != -EPROBE_DEFER)
+ dev_err(dev, "failed to get slow clock: %ld\n",
+ PTR_ERR(i2c_dev->slow_clk));
+
+ return PTR_ERR(i2c_dev->slow_clk);
+ }
+ }
+
platform_set_drvdata(pdev, i2c_dev);
if (!i2c_dev->hw->has_single_clk_source) {
@@ -1647,6 +1724,14 @@ static int tegra_i2c_probe(struct platform_device *pdev)
}
}
+ if (i2c_dev->slow_clk) {
+ ret = clk_prepare(i2c_dev->slow_clk);
+ if (ret < 0) {
+ dev_err(dev, "failed to prepare slow clock: %d\n", ret);
+ goto unprepare_fast_clk;
+ }
+ }
+
if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ &&
i2c_dev->bus_clk_rate <= I2C_MAX_FAST_MODE_PLUS_FREQ)
i2c_dev->clk_divisor_non_hs_mode =
@@ -1662,7 +1747,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
ret = clk_prepare(i2c_dev->div_clk);
if (ret < 0) {
dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
- goto unprepare_fast_clk;
+ goto unprepare_slow_clk;
}
pm_runtime_irq_safe(&pdev->dev);
@@ -1749,6 +1834,10 @@ disable_rpm:
unprepare_div_clk:
clk_unprepare(i2c_dev->div_clk);
+unprepare_slow_clk:
+ if (i2c_dev->is_vi)
+ clk_unprepare(i2c_dev->slow_clk);
+
unprepare_fast_clk:
if (!i2c_dev->hw->has_single_clk_source)
clk_unprepare(i2c_dev->fast_clk);
@@ -1770,6 +1859,10 @@ static int tegra_i2c_remove(struct platform_device *pdev)
tegra_i2c_runtime_suspend(&pdev->dev);
clk_unprepare(i2c_dev->div_clk);
+
+ if (i2c_dev->slow_clk)
+ clk_unprepare(i2c_dev->slow_clk);
+
if (!i2c_dev->hw->has_single_clk_source)
clk_unprepare(i2c_dev->fast_clk);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 11:31:12 +0000