diff mbox series

[4/7] i2c: stm32f7: add support for stm32mp25 soc

Message ID 20231129125920.1702497-5-alain.volmat@foss.st.com (mailing list archive)
State New, archived
Headers show
Series i2c: stm32f7: enhancements and support for stm32mp25 | expand

Commit Message

Alain Volmat Nov. 29, 2023, 12:59 p.m. UTC
The stm32mp25 has only a single interrupt line used for both
events and errors. In order to cope with that, reorganise the
error handling code so that it can be called either from the
common handler (used in case of SoC having only a single IT line)
and the error handler for others.
The CR1 register also embeds a new FMP bit, necessary when running
at Fast Mode Plus frequency. This bit should be used instead of
the SYSCFG bit used on other platforms.
Add a new compatible to distinguish between the SoCs and two
boolean within the setup structure in order to know if the
platform has a single/multiple IT lines and if the FMP bit
within CR1 is available or not.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
---
 drivers/i2c/busses/i2c-stm32f7.c | 230 ++++++++++++++++++-------------
 1 file changed, 134 insertions(+), 96 deletions(-)

Comments

kernel test robot Nov. 29, 2023, 11:09 p.m. UTC | #1
Hi Alain,

kernel test robot noticed the following build warnings:

[auto build test WARNING on wsa/i2c/for-next]
[also build test WARNING on atorgue-stm32/stm32-next robh/for-next linus/master v6.7-rc3 next-20231129]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alain-Volmat/i2c-stm32f7-perform-most-of-irq-job-in-threaded-handler/20231129-210806
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
patch link:    https://lore.kernel.org/r/20231129125920.1702497-5-alain.volmat%40foss.st.com
patch subject: [PATCH 4/7] i2c: stm32f7: add support for stm32mp25 soc
config: arm-defconfig (https://download.01.org/0day-ci/archive/20231130/202311300357.qiYAoEvz-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231130/202311300357.qiYAoEvz-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311300357.qiYAoEvz-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/i2c/busses/i2c-stm32f7.c:2029:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (i2c_dev->setup.fmp_cr1_bit) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/i2c/busses/i2c-stm32f7.c:2044:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/i2c/busses/i2c-stm32f7.c:2029:2: note: remove the 'if' if its condition is always false
           if (i2c_dev->setup.fmp_cr1_bit) {
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/i2c/busses/i2c-stm32f7.c:2022:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +2029 drivers/i2c/busses/i2c-stm32f7.c

  2018	
  2019	static int stm32f7_i2c_write_fm_plus_bits(struct stm32f7_i2c_dev *i2c_dev,
  2020						  bool enable)
  2021	{
  2022		int ret;
  2023	
  2024		if (i2c_dev->bus_rate <= I2C_MAX_FAST_MODE_FREQ ||
  2025		    (!i2c_dev->setup.fmp_cr1_bit && IS_ERR_OR_NULL(i2c_dev->regmap)))
  2026			/* Optional */
  2027			return 0;
  2028	
> 2029		if (i2c_dev->setup.fmp_cr1_bit) {
  2030			if (enable)
  2031				stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1, STM32_I2C_CR1_FMP);
  2032			else
  2033				stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1, STM32_I2C_CR1_FMP);
  2034		} else {
  2035			if (i2c_dev->fmp_sreg == i2c_dev->fmp_creg)
  2036				ret = regmap_update_bits(i2c_dev->regmap, i2c_dev->fmp_sreg,
  2037							 i2c_dev->fmp_mask, enable ? i2c_dev->fmp_mask : 0);
  2038			else
  2039				ret = regmap_write(i2c_dev->regmap,
  2040						   enable ? i2c_dev->fmp_sreg : i2c_dev->fmp_creg,
  2041						   i2c_dev->fmp_mask);
  2042		}
  2043	
  2044		return ret;
  2045	}
  2046
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 2a011deec3c5..9186fab3a063 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -50,6 +50,7 @@ 
 #define STM32F7_I2C_TXDR			0x28
 
 /* STM32F7 I2C control 1 */
+#define STM32_I2C_CR1_FMP			BIT(24)
 #define STM32F7_I2C_CR1_PECEN			BIT(23)
 #define STM32F7_I2C_CR1_ALERTEN			BIT(22)
 #define STM32F7_I2C_CR1_SMBHEN			BIT(20)
@@ -226,6 +227,8 @@  struct stm32f7_i2c_spec {
  * @rise_time: Rise time (ns)
  * @fall_time: Fall time (ns)
  * @fmp_clr_offset: Fast Mode Plus clear register offset from set register
+ * @single_it_line: Only a single IT line is used for both events/errors
+ * @fmp_cr1_bit: Fast Mode Plus control is done via a bit in CR1
  */
 struct stm32f7_i2c_setup {
 	u32 speed_freq;
@@ -233,6 +236,8 @@  struct stm32f7_i2c_setup {
 	u32 rise_time;
 	u32 fall_time;
 	u32 fmp_clr_offset;
+	bool single_it_line;
+	bool fmp_cr1_bit;
 };
 
 /**
@@ -418,6 +423,13 @@  static const struct stm32f7_i2c_setup stm32mp13_setup = {
 	.fmp_clr_offset = 0x4,
 };
 
+static const struct stm32f7_i2c_setup stm32mp25_setup = {
+	.rise_time = STM32F7_I2C_RISE_TIME_DEFAULT,
+	.fall_time = STM32F7_I2C_FALL_TIME_DEFAULT,
+	.single_it_line = true,
+	.fmp_cr1_bit = true,
+};
+
 static inline void stm32f7_i2c_set_bits(void __iomem *reg, u32 mask)
 {
 	writel_relaxed(readl_relaxed(reg) | mask, reg);
@@ -1419,15 +1431,13 @@  static bool stm32f7_i2c_is_slave_busy(struct stm32f7_i2c_dev *i2c_dev)
 	return i == busy;
 }
 
-static irqreturn_t stm32f7_i2c_slave_isr_event(struct stm32f7_i2c_dev *i2c_dev)
+static irqreturn_t stm32f7_i2c_slave_isr_event(struct stm32f7_i2c_dev *i2c_dev, u32 status)
 {
 	void __iomem *base = i2c_dev->base;
-	u32 cr2, status, mask;
+	u32 cr2, mask;
 	u8 val;
 	int ret;
 
-	status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
-
 	/* Slave transmitter mode */
 	if (status & STM32F7_I2C_ISR_TXIS) {
 		i2c_slave_event(i2c_dev->slave_running,
@@ -1494,17 +1504,81 @@  static irqreturn_t stm32f7_i2c_slave_isr_event(struct stm32f7_i2c_dev *i2c_dev)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t stm32f7_i2c_handle_isr_errs(struct stm32f7_i2c_dev *i2c_dev, u32 status)
+{
+	struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+	u16 addr = f7_msg->addr;
+	void __iomem *base = i2c_dev->base;
+	struct device *dev = i2c_dev->dev;
+	struct stm32_i2c_dma *dma = i2c_dev->dma;
+
+	/* Bus error */
+	if (status & STM32F7_I2C_ISR_BERR) {
+		dev_err(dev, "Bus error accessing addr 0x%x\n", addr);
+		writel_relaxed(STM32F7_I2C_ICR_BERRCF, base + STM32F7_I2C_ICR);
+		stm32f7_i2c_release_bus(&i2c_dev->adap);
+		f7_msg->result = -EIO;
+	}
+
+	/* Arbitration loss */
+	if (status & STM32F7_I2C_ISR_ARLO) {
+		dev_dbg(dev, "Arbitration loss accessing addr 0x%x\n", addr);
+		writel_relaxed(STM32F7_I2C_ICR_ARLOCF, base + STM32F7_I2C_ICR);
+		f7_msg->result = -EAGAIN;
+	}
+
+	if (status & STM32F7_I2C_ISR_PECERR) {
+		dev_err(dev, "PEC error in reception accessing addr 0x%x\n", addr);
+		writel_relaxed(STM32F7_I2C_ICR_PECCF, base + STM32F7_I2C_ICR);
+		f7_msg->result = -EINVAL;
+	}
+
+	if (status & STM32F7_I2C_ISR_ALERT) {
+		dev_dbg(dev, "SMBus alert received\n");
+		writel_relaxed(STM32F7_I2C_ICR_ALERTCF, base + STM32F7_I2C_ICR);
+		i2c_handle_smbus_alert(i2c_dev->alert->ara);
+		return IRQ_HANDLED;
+	}
+
+	if (!i2c_dev->slave_running) {
+		u32 mask;
+		/* Disable interrupts */
+		if (stm32f7_i2c_is_slave_registered(i2c_dev))
+			mask = STM32F7_I2C_XFER_IRQ_MASK;
+		else
+			mask = STM32F7_I2C_ALL_IRQ_MASK;
+		stm32f7_i2c_disable_irq(i2c_dev, mask);
+	}
+
+	/* Disable dma */
+	if (i2c_dev->use_dma) {
+		stm32f7_i2c_disable_dma_req(i2c_dev);
+		dmaengine_terminate_async(dma->chan_using);
+	}
+
+	i2c_dev->master_mode = false;
+	complete(&i2c_dev->complete);
+
+	return IRQ_HANDLED;
+}
+
+#define STM32F7_ERR_EVENTS (STM32F7_I2C_ISR_BERR | STM32F7_I2C_ISR_ARLO |\
+			    STM32F7_I2C_ISR_PECERR | STM32F7_I2C_ISR_ALERT)
 static irqreturn_t stm32f7_i2c_isr_event(int irq, void *data)
 {
 	struct stm32f7_i2c_dev *i2c_dev = data;
 	u32 status;
 
-	/* Check if the interrupt is for a slave device */
-	if (!i2c_dev->master_mode)
-		return IRQ_WAKE_THREAD;
-
 	status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
 
+	/*
+	 * Check if the interrupt is for a slave device or related
+	 * to errors flags (in case of single it line mode)
+	 */
+	if (!i2c_dev->master_mode ||
+	    (i2c_dev->setup.single_it_line && (status & STM32F7_ERR_EVENTS)))
+		return IRQ_WAKE_THREAD;
+
 	/* Tx empty */
 	if (status & STM32F7_I2C_ISR_TXIS)
 		stm32f7_i2c_write_tx_data(i2c_dev);
@@ -1531,10 +1605,14 @@  static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data)
 	u32 status, mask;
 	int ret;
 
+	status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
+
 	if (!i2c_dev->master_mode)
-		return stm32f7_i2c_slave_isr_event(i2c_dev);
+		return stm32f7_i2c_slave_isr_event(i2c_dev, status);
 
-	status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
+	/* Handle errors in case of this handler is used for events/errors */
+	if (i2c_dev->setup.single_it_line && (status & STM32F7_ERR_EVENTS))
+		return stm32f7_i2c_handle_isr_errs(i2c_dev, status);
 
 	/* NACK received */
 	if (status & STM32F7_I2C_ISR_NACKF) {
@@ -1601,63 +1679,11 @@  static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data)
 static irqreturn_t stm32f7_i2c_isr_error_thread(int irq, void *data)
 {
 	struct stm32f7_i2c_dev *i2c_dev = data;
-	struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
-	u16 addr = f7_msg->addr;
-	void __iomem *base = i2c_dev->base;
-	struct device *dev = i2c_dev->dev;
-	struct stm32_i2c_dma *dma = i2c_dev->dma;
 	u32 status;
 
 	status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
 
-	/* Bus error */
-	if (status & STM32F7_I2C_ISR_BERR) {
-		dev_err(dev, "Bus error accessing addr 0x%x\n", addr);
-		writel_relaxed(STM32F7_I2C_ICR_BERRCF, base + STM32F7_I2C_ICR);
-		stm32f7_i2c_release_bus(&i2c_dev->adap);
-		f7_msg->result = -EIO;
-	}
-
-	/* Arbitration loss */
-	if (status & STM32F7_I2C_ISR_ARLO) {
-		dev_dbg(dev, "Arbitration loss accessing addr 0x%x\n", addr);
-		writel_relaxed(STM32F7_I2C_ICR_ARLOCF, base + STM32F7_I2C_ICR);
-		f7_msg->result = -EAGAIN;
-	}
-
-	if (status & STM32F7_I2C_ISR_PECERR) {
-		dev_err(dev, "PEC error in reception accessing addr 0x%x\n", addr);
-		writel_relaxed(STM32F7_I2C_ICR_PECCF, base + STM32F7_I2C_ICR);
-		f7_msg->result = -EINVAL;
-	}
-
-	if (status & STM32F7_I2C_ISR_ALERT) {
-		dev_dbg(dev, "SMBus alert received\n");
-		writel_relaxed(STM32F7_I2C_ICR_ALERTCF, base + STM32F7_I2C_ICR);
-		i2c_handle_smbus_alert(i2c_dev->alert->ara);
-		return IRQ_HANDLED;
-	}
-
-	if (!i2c_dev->slave_running) {
-		u32 mask;
-		/* Disable interrupts */
-		if (stm32f7_i2c_is_slave_registered(i2c_dev))
-			mask = STM32F7_I2C_XFER_IRQ_MASK;
-		else
-			mask = STM32F7_I2C_ALL_IRQ_MASK;
-		stm32f7_i2c_disable_irq(i2c_dev, mask);
-	}
-
-	/* Disable dma */
-	if (i2c_dev->use_dma) {
-		stm32f7_i2c_disable_dma_req(i2c_dev);
-		dmaengine_terminate_async(dma->chan_using);
-	}
-
-	i2c_dev->master_mode = false;
-	complete(&i2c_dev->complete);
-
-	return IRQ_HANDLED;
+	return stm32f7_i2c_handle_isr_errs(i2c_dev, status);
 }
 
 static int stm32f7_i2c_wait_polling(struct stm32f7_i2c_dev *i2c_dev)
@@ -1996,20 +2022,24 @@  static int stm32f7_i2c_write_fm_plus_bits(struct stm32f7_i2c_dev *i2c_dev,
 	int ret;
 
 	if (i2c_dev->bus_rate <= I2C_MAX_FAST_MODE_FREQ ||
-	    IS_ERR_OR_NULL(i2c_dev->regmap))
+	    (!i2c_dev->setup.fmp_cr1_bit && IS_ERR_OR_NULL(i2c_dev->regmap)))
 		/* Optional */
 		return 0;
 
-	if (i2c_dev->fmp_sreg == i2c_dev->fmp_creg)
-		ret = regmap_update_bits(i2c_dev->regmap,
-					 i2c_dev->fmp_sreg,
-					 i2c_dev->fmp_mask,
-					 enable ? i2c_dev->fmp_mask : 0);
-	else
-		ret = regmap_write(i2c_dev->regmap,
-				   enable ? i2c_dev->fmp_sreg :
-					    i2c_dev->fmp_creg,
-				   i2c_dev->fmp_mask);
+	if (i2c_dev->setup.fmp_cr1_bit) {
+		if (enable)
+			stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1, STM32_I2C_CR1_FMP);
+		else
+			stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1, STM32_I2C_CR1_FMP);
+	} else {
+		if (i2c_dev->fmp_sreg == i2c_dev->fmp_creg)
+			ret = regmap_update_bits(i2c_dev->regmap, i2c_dev->fmp_sreg,
+						 i2c_dev->fmp_mask, enable ? i2c_dev->fmp_mask : 0);
+		else
+			ret = regmap_write(i2c_dev->regmap,
+					   enable ? i2c_dev->fmp_sreg : i2c_dev->fmp_creg,
+					   i2c_dev->fmp_mask);
+	}
 
 	return ret;
 }
@@ -2143,6 +2173,13 @@  static int stm32f7_i2c_probe(struct platform_device *pdev)
 	if (!i2c_dev)
 		return -ENOMEM;
 
+	setup = of_device_get_match_data(&pdev->dev);
+	if (!setup) {
+		dev_err(&pdev->dev, "Can't get device data\n");
+		return -ENODEV;
+	}
+	i2c_dev->setup = *setup;
+
 	i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(i2c_dev->base))
 		return PTR_ERR(i2c_dev->base);
@@ -2152,9 +2189,11 @@  static int stm32f7_i2c_probe(struct platform_device *pdev)
 	if (irq_event < 0)
 		return irq_event;
 
-	irq_error = platform_get_irq(pdev, 1);
-	if (irq_error < 0)
-		return irq_error;
+	if (!i2c_dev->setup.single_it_line) {
+		irq_error = platform_get_irq(pdev, 1);
+		if (irq_error < 0)
+			return irq_error;
+	}
 
 	i2c_dev->wakeup_src = of_property_read_bool(pdev->dev.of_node,
 						    "wakeup-source");
@@ -2186,23 +2225,18 @@  static int stm32f7_i2c_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = devm_request_threaded_irq(&pdev->dev, irq_error,
-					NULL,
-					stm32f7_i2c_isr_error_thread,
-					IRQF_ONESHOT,
-					pdev->name, i2c_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to request irq error %i\n",
-			irq_error);
-		return ret;
-	}
-
-	setup = of_device_get_match_data(&pdev->dev);
-	if (!setup) {
-		dev_err(&pdev->dev, "Can't get device data\n");
-		return -ENODEV;
+	if (!i2c_dev->setup.single_it_line) {
+		ret = devm_request_threaded_irq(&pdev->dev, irq_error,
+						NULL,
+						stm32f7_i2c_isr_error_thread,
+						IRQF_ONESHOT,
+						pdev->name, i2c_dev);
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to request irq error %i\n",
+				irq_error);
+			return ret;
+		}
 	}
-	i2c_dev->setup = *setup;
 
 	ret = stm32f7_i2c_setup_timing(i2c_dev, &i2c_dev->setup);
 	if (ret)
@@ -2210,9 +2244,12 @@  static int stm32f7_i2c_probe(struct platform_device *pdev)
 
 	/* Setup Fast mode plus if necessary */
 	if (i2c_dev->bus_rate > I2C_MAX_FAST_MODE_FREQ) {
-		ret = stm32f7_i2c_setup_fm_plus_bits(pdev, i2c_dev);
-		if (ret)
-			return ret;
+		if (!i2c_dev->setup.fmp_cr1_bit) {
+			ret = stm32f7_i2c_setup_fm_plus_bits(pdev, i2c_dev);
+			if (ret)
+				return ret;
+		}
+
 		ret = stm32f7_i2c_write_fm_plus_bits(i2c_dev, true);
 		if (ret)
 			return ret;
@@ -2491,6 +2528,7 @@  static const struct of_device_id stm32f7_i2c_match[] = {
 	{ .compatible = "st,stm32f7-i2c", .data = &stm32f7_setup},
 	{ .compatible = "st,stm32mp15-i2c", .data = &stm32mp15_setup},
 	{ .compatible = "st,stm32mp13-i2c", .data = &stm32mp13_setup},
+	{ .compatible = "st,stm32mp25-i2c", .data = &stm32mp25_setup},
 	{},
 };
 MODULE_DEVICE_TABLE(of, stm32f7_i2c_match);