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Diffstat (limited to 'drivers/i2c/busses/i2c-exynos5.c')
-rw-r--r--drivers/i2c/busses/i2c-exynos5.c110
1 files changed, 93 insertions, 17 deletions
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index 97d4f3ac0abd..b812d1090c0f 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -169,6 +169,7 @@
enum i2c_type_exynos {
I2C_TYPE_EXYNOS5,
I2C_TYPE_EXYNOS7,
+ I2C_TYPE_EXYNOSAUTOV9,
};
struct exynos5_i2c {
@@ -181,7 +182,8 @@ struct exynos5_i2c {
unsigned int irq;
void __iomem *regs;
- struct clk *clk;
+ struct clk *clk; /* operating clock */
+ struct clk *pclk; /* bus clock */
struct device *dev;
int state;
@@ -230,6 +232,11 @@ static const struct exynos_hsi2c_variant exynos7_hsi2c_data = {
.hw = I2C_TYPE_EXYNOS7,
};
+static const struct exynos_hsi2c_variant exynosautov9_hsi2c_data = {
+ .fifo_depth = 64,
+ .hw = I2C_TYPE_EXYNOSAUTOV9,
+};
+
static const struct of_device_id exynos5_i2c_match[] = {
{
.compatible = "samsung,exynos5-hsi2c",
@@ -243,6 +250,9 @@ static const struct of_device_id exynos5_i2c_match[] = {
}, {
.compatible = "samsung,exynos7-hsi2c",
.data = &exynos7_hsi2c_data
+ }, {
+ .compatible = "samsung,exynosautov9-hsi2c",
+ .data = &exynosautov9_hsi2c_data
}, {},
};
MODULE_DEVICE_TABLE(of, exynos5_i2c_match);
@@ -282,6 +292,31 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, bool hs_timings)
int div, clk_cycle, temp;
/*
+ * In case of HSI2C controllers in ExynosAutoV9:
+ *
+ * FSCL = IPCLK / ((CLK_DIV + 1) * 16)
+ * T_SCL_LOW = IPCLK * (CLK_DIV + 1) * (N + M)
+ * [N : number of 0's in the TSCL_H_HS]
+ * [M : number of 0's in the TSCL_L_HS]
+ * T_SCL_HIGH = IPCLK * (CLK_DIV + 1) * (N + M)
+ * [N : number of 1's in the TSCL_H_HS]
+ * [M : number of 1's in the TSCL_L_HS]
+ *
+ * Result of (N + M) is always 8.
+ * In general case, we don't need to control timing_s1 and timing_s2.
+ */
+ if (i2c->variant->hw == I2C_TYPE_EXYNOSAUTOV9) {
+ div = ((clkin / (16 * i2c->op_clock)) - 1);
+ i2c_timing_s3 = div << 16;
+ if (hs_timings)
+ writel(i2c_timing_s3, i2c->regs + HSI2C_TIMING_HS3);
+ else
+ writel(i2c_timing_s3, i2c->regs + HSI2C_TIMING_FS3);
+
+ return 0;
+ }
+
+ /*
* In case of HSI2C controller in Exynos5 series
* FPCLK / FI2C =
* (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + 2 * FLT_CYCLE
@@ -422,7 +457,10 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
writel(int_status, i2c->regs + HSI2C_INT_STATUS);
/* handle interrupt related to the transfer status */
- if (i2c->variant->hw == I2C_TYPE_EXYNOS7) {
+ switch (i2c->variant->hw) {
+ case I2C_TYPE_EXYNOSAUTOV9:
+ fallthrough;
+ case I2C_TYPE_EXYNOS7:
if (int_status & HSI2C_INT_TRANS_DONE) {
i2c->trans_done = 1;
i2c->state = 0;
@@ -443,7 +481,12 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
i2c->state = -ETIMEDOUT;
goto stop;
}
- } else if (int_status & HSI2C_INT_I2C) {
+
+ break;
+ case I2C_TYPE_EXYNOS5:
+ if (!(int_status & HSI2C_INT_I2C))
+ break;
+
trans_status = readl(i2c->regs + HSI2C_TRANS_STATUS);
if (trans_status & HSI2C_NO_DEV_ACK) {
dev_dbg(i2c->dev, "No ACK from device\n");
@@ -465,6 +508,8 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
i2c->trans_done = 1;
i2c->state = 0;
}
+
+ break;
}
if ((i2c->msg->flags & I2C_M_RD) && (int_status &
@@ -569,13 +614,13 @@ static void exynos5_i2c_bus_check(struct exynos5_i2c *i2c)
{
unsigned long timeout;
- if (i2c->variant->hw != I2C_TYPE_EXYNOS7)
+ if (i2c->variant->hw == I2C_TYPE_EXYNOS5)
return;
/*
- * HSI2C_MASTER_ST_LOSE state in EXYNOS7 variant before transaction
- * indicates that bus is stuck (SDA is low). In such case bus recovery
- * can be performed.
+ * HSI2C_MASTER_ST_LOSE state (in Exynos7 and ExynosAutoV9 variants)
+ * before transaction indicates that bus is stuck (SDA is low).
+ * In such case bus recovery can be performed.
*/
timeout = jiffies + msecs_to_jiffies(100);
for (;;) {
@@ -611,10 +656,10 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop)
unsigned long flags;
unsigned short trig_lvl;
- if (i2c->variant->hw == I2C_TYPE_EXYNOS7)
- int_en |= HSI2C_INT_I2C_TRANS;
- else
+ if (i2c->variant->hw == I2C_TYPE_EXYNOS5)
int_en |= HSI2C_INT_I2C;
+ else
+ int_en |= HSI2C_INT_I2C_TRANS;
i2c_ctl = readl(i2c->regs + HSI2C_CTL);
i2c_ctl &= ~(HSI2C_TXCHON | HSI2C_RXCHON);
@@ -713,10 +758,14 @@ static int exynos5_i2c_xfer(struct i2c_adapter *adap,
struct exynos5_i2c *i2c = adap->algo_data;
int i, ret;
- ret = clk_enable(i2c->clk);
+ ret = clk_enable(i2c->pclk);
if (ret)
return ret;
+ ret = clk_enable(i2c->clk);
+ if (ret)
+ goto err_pclk;
+
for (i = 0; i < num; ++i) {
ret = exynos5_i2c_xfer_msg(i2c, msgs + i, i + 1 == num);
if (ret)
@@ -724,6 +773,8 @@ static int exynos5_i2c_xfer(struct i2c_adapter *adap,
}
clk_disable(i2c->clk);
+err_pclk:
+ clk_disable(i2c->pclk);
return ret ?: num;
}
@@ -763,10 +814,20 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
return -ENOENT;
}
- ret = clk_prepare_enable(i2c->clk);
+ i2c->pclk = devm_clk_get_optional(&pdev->dev, "hsi2c_pclk");
+ if (IS_ERR(i2c->pclk)) {
+ return dev_err_probe(&pdev->dev, PTR_ERR(i2c->pclk),
+ "cannot get pclk");
+ }
+
+ ret = clk_prepare_enable(i2c->pclk);
if (ret)
return ret;
+ ret = clk_prepare_enable(i2c->clk);
+ if (ret)
+ goto err_pclk;
+
i2c->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(i2c->regs)) {
ret = PTR_ERR(i2c->regs);
@@ -809,11 +870,15 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, i2c);
clk_disable(i2c->clk);
+ clk_disable(i2c->pclk);
return 0;
err_clk:
clk_disable_unprepare(i2c->clk);
+
+ err_pclk:
+ clk_disable_unprepare(i2c->pclk);
return ret;
}
@@ -824,6 +889,7 @@ static int exynos5_i2c_remove(struct platform_device *pdev)
i2c_del_adapter(&i2c->adap);
clk_unprepare(i2c->clk);
+ clk_unprepare(i2c->pclk);
return 0;
}
@@ -835,6 +901,7 @@ static int exynos5_i2c_suspend_noirq(struct device *dev)
i2c_mark_adapter_suspended(&i2c->adap);
clk_unprepare(i2c->clk);
+ clk_unprepare(i2c->pclk);
return 0;
}
@@ -844,21 +911,30 @@ static int exynos5_i2c_resume_noirq(struct device *dev)
struct exynos5_i2c *i2c = dev_get_drvdata(dev);
int ret = 0;
- ret = clk_prepare_enable(i2c->clk);
+ ret = clk_prepare_enable(i2c->pclk);
if (ret)
return ret;
+ ret = clk_prepare_enable(i2c->clk);
+ if (ret)
+ goto err_pclk;
+
ret = exynos5_hsi2c_clock_setup(i2c);
- if (ret) {
- clk_disable_unprepare(i2c->clk);
- return ret;
- }
+ if (ret)
+ goto err_clk;
exynos5_i2c_init(i2c);
clk_disable(i2c->clk);
+ clk_disable(i2c->pclk);
i2c_mark_adapter_resumed(&i2c->adap);
return 0;
+
+err_clk:
+ clk_disable_unprepare(i2c->clk);
+err_pclk:
+ clk_disable_unprepare(i2c->pclk);
+ return ret;
}
#endif
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.