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path: root/drivers/i2c/busses/i2c-stm32f7.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-stm32f7.c')
-rw-r--r--drivers/i2c/busses/i2c-stm32f7.c82
1 files changed, 42 insertions, 40 deletions
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index c62c815b88eb..0138317ea600 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -164,7 +164,6 @@ enum {
#define STM32F7_I2C_DNF_DEFAULT 0
#define STM32F7_I2C_DNF_MAX 15
-#define STM32F7_I2C_ANALOG_FILTER_ENABLE 1
#define STM32F7_I2C_ANALOG_FILTER_DELAY_MIN 50 /* ns */
#define STM32F7_I2C_ANALOG_FILTER_DELAY_MAX 260 /* ns */
@@ -223,8 +222,6 @@ struct stm32f7_i2c_spec {
* @clock_src: I2C clock source frequency (Hz)
* @rise_time: Rise time (ns)
* @fall_time: Fall time (ns)
- * @dnf: Digital filter coefficient (0-16)
- * @analog_filter: Analog filter delay (On/Off)
* @fmp_clr_offset: Fast Mode Plus clear register offset from set register
*/
struct stm32f7_i2c_setup {
@@ -232,8 +229,6 @@ struct stm32f7_i2c_setup {
u32 clock_src;
u32 rise_time;
u32 fall_time;
- u8 dnf;
- bool analog_filter;
u32 fmp_clr_offset;
};
@@ -312,6 +307,9 @@ struct stm32f7_i2c_msg {
* @wakeup_src: boolean to know if the device is a wakeup source
* @smbus_mode: states that the controller is configured in SMBus mode
* @host_notify_client: SMBus host-notify client
+ * @analog_filter: boolean to indicate enabling of the analog filter
+ * @dnf_dt: value of digital filter requested via dt
+ * @dnf: value of digital filter to apply
*/
struct stm32f7_i2c_dev {
struct i2c_adapter adap;
@@ -340,6 +338,9 @@ struct stm32f7_i2c_dev {
bool wakeup_src;
bool smbus_mode;
struct i2c_client *host_notify_client;
+ bool analog_filter;
+ u32 dnf_dt;
+ u32 dnf;
};
/*
@@ -385,15 +386,11 @@ static struct stm32f7_i2c_spec stm32f7_i2c_specs[] = {
static const struct stm32f7_i2c_setup stm32f7_setup = {
.rise_time = STM32F7_I2C_RISE_TIME_DEFAULT,
.fall_time = STM32F7_I2C_FALL_TIME_DEFAULT,
- .dnf = STM32F7_I2C_DNF_DEFAULT,
- .analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
};
static const struct stm32f7_i2c_setup stm32mp15_setup = {
.rise_time = STM32F7_I2C_RISE_TIME_DEFAULT,
.fall_time = STM32F7_I2C_FALL_TIME_DEFAULT,
- .dnf = STM32F7_I2C_DNF_DEFAULT,
- .analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
.fmp_clr_offset = 0x40,
};
@@ -462,27 +459,28 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
return -EINVAL;
}
- if (setup->dnf > STM32F7_I2C_DNF_MAX) {
+ i2c_dev->dnf = DIV_ROUND_CLOSEST(i2c_dev->dnf_dt, i2cclk);
+ if (i2c_dev->dnf > STM32F7_I2C_DNF_MAX) {
dev_err(i2c_dev->dev,
"DNF out of bound %d/%d\n",
- setup->dnf, STM32F7_I2C_DNF_MAX);
+ i2c_dev->dnf * i2cclk, STM32F7_I2C_DNF_MAX * i2cclk);
return -EINVAL;
}
/* Analog and Digital Filters */
af_delay_min =
- (setup->analog_filter ?
+ (i2c_dev->analog_filter ?
STM32F7_I2C_ANALOG_FILTER_DELAY_MIN : 0);
af_delay_max =
- (setup->analog_filter ?
+ (i2c_dev->analog_filter ?
STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0);
- dnf_delay = setup->dnf * i2cclk;
+ dnf_delay = i2c_dev->dnf * i2cclk;
sdadel_min = specs->hddat_min + setup->fall_time -
- af_delay_min - (setup->dnf + 3) * i2cclk;
+ af_delay_min - (i2c_dev->dnf + 3) * i2cclk;
sdadel_max = specs->vddat_max - setup->rise_time -
- af_delay_max - (setup->dnf + 4) * i2cclk;
+ af_delay_max - (i2c_dev->dnf + 4) * i2cclk;
scldel_min = setup->rise_time + specs->sudat_min;
@@ -648,6 +646,7 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
setup->speed_freq = t->bus_freq_hz;
i2c_dev->setup.rise_time = t->scl_rise_ns;
i2c_dev->setup.fall_time = t->scl_fall_ns;
+ i2c_dev->dnf_dt = t->digital_filter_width_ns;
setup->clock_src = clk_get_rate(i2c_dev->clk);
if (!setup->clock_src) {
@@ -655,6 +654,9 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
return -EINVAL;
}
+ if (!of_property_read_bool(i2c_dev->dev->of_node, "i2c-digital-filter"))
+ i2c_dev->dnf_dt = STM32F7_I2C_DNF_DEFAULT;
+
do {
ret = stm32f7_i2c_compute_timing(i2c_dev, setup,
&i2c_dev->timing);
@@ -676,12 +678,15 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
return ret;
}
+ i2c_dev->analog_filter = of_property_read_bool(i2c_dev->dev->of_node,
+ "i2c-analog-filter");
+
dev_dbg(i2c_dev->dev, "I2C Speed(%i), Clk Source(%i)\n",
setup->speed_freq, setup->clock_src);
dev_dbg(i2c_dev->dev, "I2C Rise(%i) and Fall(%i) Time\n",
setup->rise_time, setup->fall_time);
dev_dbg(i2c_dev->dev, "I2C Analog Filter(%s), DNF(%i)\n",
- (setup->analog_filter ? "On" : "Off"), setup->dnf);
+ (i2c_dev->analog_filter ? "On" : "Off"), i2c_dev->dnf);
i2c_dev->bus_rate = setup->speed_freq;
@@ -720,8 +725,8 @@ static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev)
timing |= STM32F7_I2C_TIMINGR_SCLL(t->scll);
writel_relaxed(timing, i2c_dev->base + STM32F7_I2C_TIMINGR);
- /* Enable I2C */
- if (i2c_dev->setup.analog_filter)
+ /* Configure the Analog Filter */
+ if (i2c_dev->analog_filter)
stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
STM32F7_I2C_CR1_ANFOFF);
else
@@ -732,7 +737,7 @@ static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev)
stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
STM32F7_I2C_CR1_DNF_MASK);
stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
- STM32F7_I2C_CR1_DNF(i2c_dev->setup.dnf));
+ STM32F7_I2C_CR1_DNF(i2c_dev->dnf));
stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
STM32F7_I2C_CR1_PE);
@@ -1597,7 +1602,8 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
/* Bus error */
if (status & STM32F7_I2C_ISR_BERR) {
- dev_err(dev, "<%s>: Bus error\n", __func__);
+ dev_err(dev, "<%s>: Bus error accessing addr 0x%x\n",
+ __func__, f7_msg->addr);
writel_relaxed(STM32F7_I2C_ICR_BERRCF, base + STM32F7_I2C_ICR);
stm32f7_i2c_release_bus(&i2c_dev->adap);
f7_msg->result = -EIO;
@@ -1605,13 +1611,15 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
/* Arbitration loss */
if (status & STM32F7_I2C_ISR_ARLO) {
- dev_dbg(dev, "<%s>: Arbitration loss\n", __func__);
+ dev_dbg(dev, "<%s>: Arbitration loss accessing addr 0x%x\n",
+ __func__, f7_msg->addr);
writel_relaxed(STM32F7_I2C_ICR_ARLOCF, base + STM32F7_I2C_ICR);
f7_msg->result = -EAGAIN;
}
if (status & STM32F7_I2C_ISR_PECERR) {
- dev_err(dev, "<%s>: PEC error in reception\n", __func__);
+ dev_err(dev, "<%s>: PEC error in reception accessing addr 0x%x\n",
+ __func__, f7_msg->addr);
writel_relaxed(STM32F7_I2C_ICR_PECCF, base + STM32F7_I2C_ICR);
f7_msg->result = -EINVAL;
}
@@ -1652,7 +1660,7 @@ static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
i2c_dev->msg_id = 0;
f7_msg->smbus = false;
- ret = pm_runtime_get_sync(i2c_dev->dev);
+ ret = pm_runtime_resume_and_get(i2c_dev->dev);
if (ret < 0)
return ret;
@@ -1698,7 +1706,7 @@ static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
f7_msg->read_write = read_write;
f7_msg->smbus = true;
- ret = pm_runtime_get_sync(dev);
+ ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
@@ -1799,7 +1807,7 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
if (ret)
return ret;
- ret = pm_runtime_get_sync(dev);
+ ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
@@ -1880,7 +1888,7 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
WARN_ON(!i2c_dev->slave[id]);
- ret = pm_runtime_get_sync(i2c_dev->dev);
+ ret = pm_runtime_resume_and_get(i2c_dev->dev);
if (ret < 0)
return ret;
@@ -2027,12 +2035,8 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
phy_addr = (dma_addr_t)res->start;
irq_event = platform_get_irq(pdev, 0);
- if (irq_event <= 0) {
- if (irq_event != -EPROBE_DEFER)
- dev_err(&pdev->dev, "Failed to get IRQ event: %d\n",
- irq_event);
+ if (irq_event <= 0)
return irq_event ? : -ENOENT;
- }
irq_error = platform_get_irq(pdev, 1);
if (irq_error <= 0)
@@ -2267,13 +2271,12 @@ static int __maybe_unused stm32f7_i2c_runtime_resume(struct device *dev)
return 0;
}
-#ifdef CONFIG_PM_SLEEP
-static int stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
+static int __maybe_unused stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
{
int ret;
struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
- ret = pm_runtime_get_sync(i2c_dev->dev);
+ ret = pm_runtime_resume_and_get(i2c_dev->dev);
if (ret < 0)
return ret;
@@ -2289,13 +2292,13 @@ static int stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
return ret;
}
-static int stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
+static int __maybe_unused stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
{
u32 cr1;
int ret;
struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
- ret = pm_runtime_get_sync(i2c_dev->dev);
+ ret = pm_runtime_resume_and_get(i2c_dev->dev);
if (ret < 0)
return ret;
@@ -2320,7 +2323,7 @@ static int stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
return ret;
}
-static int stm32f7_i2c_suspend(struct device *dev)
+static int __maybe_unused stm32f7_i2c_suspend(struct device *dev)
{
struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
int ret;
@@ -2341,7 +2344,7 @@ static int stm32f7_i2c_suspend(struct device *dev)
return 0;
}
-static int stm32f7_i2c_resume(struct device *dev)
+static int __maybe_unused stm32f7_i2c_resume(struct device *dev)
{
struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
int ret;
@@ -2361,7 +2364,6 @@ static int stm32f7_i2c_resume(struct device *dev)
return 0;
}
-#endif
static const struct dev_pm_ops stm32f7_i2c_pm_ops = {
SET_RUNTIME_PM_OPS(stm32f7_i2c_runtime_suspend,
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-02 08:39:43 +0300