drivers: adc: Add STM32L1X ADC support

Add ADC driver support for STM32L1X SoC series.

Signed-off-by: Takumi Ando <takumi@t15.red>

drivers/adc/adc_stm32.c

@@ -161,6 +161,18 @@ static const u32_t table_samp_time[] = {
 	SMP_TIME(247, S_5),
 	SMP_TIME(640, S_5),
 };
+#elif defined(CONFIG_SOC_SERIES_STM32L1X)
+static const u16_t acq_time_tbl[8] = {5, 10, 17, 25, 49, 97, 193, 385};
+static const u32_t table_samp_time[] = {
+	SMP_TIME(4,   S),
+	SMP_TIME(9,   S),
+	SMP_TIME(16,  S),
+	SMP_TIME(24,  S),
+	SMP_TIME(48,  S),
+	SMP_TIME(96,  S),
+	SMP_TIME(192, S),
+	SMP_TIME(384, S),
+};
 #endif
 
 /* 16 external channels. */
@@ -456,7 +468,8 @@ static int adc_stm32_channel_setup(struct device *dev,
 #if !defined(CONFIG_SOC_SERIES_STM32F2X) && \
 	!defined(CONFIG_SOC_SERIES_STM32F4X) && \
 	!defined(CONFIG_SOC_SERIES_STM32F7X) && \
-	!defined(CONFIG_SOC_SERIES_STM32F1X)
+	!defined(CONFIG_SOC_SERIES_STM32F1X) && \
+	!defined(CONFIG_SOC_SERIES_STM32L1X)
 static void adc_stm32_calib(struct device *dev)
 {
 	struct adc_stm32_cfg *config =
@@ -534,12 +547,16 @@ static int adc_stm32_init(struct device *dev)
 	defined(CONFIG_SOC_SERIES_STM32G4X)
 	LL_ADC_SetCommonClock(__LL_ADC_COMMON_INSTANCE(adc),
 			LL_ADC_CLOCK_SYNC_PCLK_DIV4);
+#elif defined(CONFIG_SOC_SERIES_STM32L1X)
+	LL_ADC_SetCommonClock(__LL_ADC_COMMON_INSTANCE(adc),
+			LL_ADC_CLOCK_ASYNC_DIV4);
 #endif
 
 #if !defined(CONFIG_SOC_SERIES_STM32F2X) && \
 	!defined(CONFIG_SOC_SERIES_STM32F4X) && \
 	!defined(CONFIG_SOC_SERIES_STM32F7X) && \
-	!defined(CONFIG_SOC_SERIES_STM32F1X)
+	!defined(CONFIG_SOC_SERIES_STM32F1X) && \
+	!defined(CONFIG_SOC_SERIES_STM32L1X)
 	/*
 	 * Calibration of F1 series has to be started after ADC Module is
 	 * enabled.

drivers/pinmux/stm32/pinmux_stm32l1x.h

@@ -17,26 +17,42 @@
 	(STM32_PINMUX_ALT_FUNC_1 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PA0_USART2_CTS   \
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUSHPULL_PULLUP)
+#define STM32L1X_PINMUX_FUNC_PA0_ADC1_IN0  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA1_PWM2_CH2   \
 	(STM32_PINMUX_ALT_FUNC_1 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PA1_USART2_RTS  \
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUPDR_NO_PULL)
+#define STM32L1X_PINMUX_FUNC_PA1_ADC1_IN1  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA2_PWM2_CH3   \
 	(STM32_PINMUX_ALT_FUNC_1 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PA2_USART2_TX  \
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUSHPULL_PULLUP)
+#define STM32L1X_PINMUX_FUNC_PA2_ADC1_IN2  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA3_PWM2_CH4   \
 	(STM32_PINMUX_ALT_FUNC_1 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PA3_USART2_RX  \
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUPDR_NO_PULL)
+#define STM32L1X_PINMUX_FUNC_PA3_ADC1_IN3  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA4_SPI1_NSS   \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUSHPULL_PULLUP)
+#define STM32L1X_PINMUX_FUNC_PA4_ADC1_IN4  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA5_SPI1_SCK   \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUSHPULL_NOPULL)
+#define STM32L1X_PINMUX_FUNC_PA5_ADC1_IN5  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA6_SPI1_MISO  \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUPDR_PULL_DOWN)
+#define STM32L1X_PINMUX_FUNC_PA6_ADC1_IN6  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA7_SPI1_MOSI  \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUPDR_PULL_DOWN)
+#define STM32L1X_PINMUX_FUNC_PA7_ADC1_IN7  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PA9_USART1_TX  \
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUSHPULL_PULLUP)
 #define STM32L1X_PINMUX_FUNC_PA10_USART1_RX \
@@ -51,8 +67,12 @@
 /* Port B */
 #define STM32L1X_PINMUX_FUNC_PB0_PWM3_CH3   \
 	(STM32_PINMUX_ALT_FUNC_2 | STM32_PUSHPULL_NOPULL)
+#define STM32L1X_PINMUX_FUNC_PB0_ADC1_IN8  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PB1_PWM3_CH4   \
 	(STM32_PINMUX_ALT_FUNC_2 | STM32_PUSHPULL_NOPULL)
+#define STM32L1X_PINMUX_FUNC_PB1_ADC1_IN9  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PB3_PWM2_CH2   \
 	(STM32_PINMUX_ALT_FUNC_1 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PB3_SPI1_SCK   \
@@ -99,20 +119,40 @@
 	(STM32_PINMUX_ALT_FUNC_3 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PB12_SPI2_NSS   \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUSHPULL_PULLUP)
+#define STM32L1X_PINMUX_FUNC_PB12_ADC1_IN18  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PB13_PWM9_CH1  \
 	(STM32_PINMUX_ALT_FUNC_3 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PB13_SPI2_SCK   \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUSHPULL_NOPULL)
+#define STM32L1X_PINMUX_FUNC_PB13_ADC1_IN19  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PB14_PWM9_CH2  \
 	(STM32_PINMUX_ALT_FUNC_3 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PB14_SPI2_MISO  \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUPDR_PULL_DOWN)
+#define STM32L1X_PINMUX_FUNC_PB14_ADC1_IN20  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PB15_PWM11_CH1  \
 	(STM32_PINMUX_ALT_FUNC_3 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PB15_SPI2_MOSI  \
 	(STM32_PINMUX_ALT_FUNC_5 | STM32_PUPDR_PULL_DOWN)
+#define STM32L1X_PINMUX_FUNC_PB15_ADC1_IN21  \
+	STM32_MODER_ANALOG_MODE
 
 /* Port C */
+#define STM32L1X_PINMUX_FUNC_PC0_ADC1_IN10  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PC1_ADC1_IN11  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PC2_ADC1_IN12  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PC3_ADC1_IN13  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PC4_ADC1_IN14  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PC5_ADC1_IN15  \
+	STM32_MODER_ANALOG_MODE
 #define STM32L1X_PINMUX_FUNC_PC6_PWM3_CH1  \
 	(STM32_PINMUX_ALT_FUNC_2 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PC7_PWM3_CH2  \
@@ -145,5 +185,25 @@
 	(STM32_PINMUX_ALT_FUNC_3 | STM32_PUSHPULL_NOPULL)
 #define STM32L1X_PINMUX_FUNC_PE1_PWM11_CH1   \
 	(STM32_PINMUX_ALT_FUNC_3 | STM32_PUSHPULL_NOPULL)
+#define STM32L1X_PINMUX_FUNC_PE7_ADC1_IN22  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PE8_ADC1_IN23  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PE9_ADC1_IN24  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PE10_ADC1_IN25  \
+	STM32_MODER_ANALOG_MODE
+
+/* Port F */
+#define STM32L1X_PINMUX_FUNC_PF6_ADC1_IN27  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PF7_ADC1_IN28  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PF8_ADC1_IN29  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PF9_ADC1_IN30  \
+	STM32_MODER_ANALOG_MODE
+#define STM32L1X_PINMUX_FUNC_PF10_ADC1_IN31  \
+	STM32_MODER_ANALOG_MODE
 
 #endif /* ZEPHYR_DRIVERS_PINMUX_STM32_PINMUX_STM32L1X_H_ */

dts/arm/st/l1/stm32l1.dtsi

@@ -112,6 +112,16 @@
 			label = "UART_1";
 		};
 
+		adc1: adc@40012400 {
+			compatible = "st,stm32-adc";
+			reg = <0x40012400 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB2 0x00000200>;
+			interrupts = <18 0>;
+			status = "disabled";
+			label = "ADC_1";
+			#io-channel-cells = <1>;
+		};
+
 		pinctrl: pin-controller@40020000 {
 			compatible = "st,stm32-pinmux";
 			#address-cells = <1>;

soc/arm/st_stm32/stm32l1/dts_fixup.h

@@ -84,5 +84,7 @@
 
 #define DT_WDT_0_NAME			DT_INST_0_ST_STM32_WATCHDOG_LABEL
 
+#define DT_ADC_1_NAME			DT_ST_STM32_ADC_40012400_LABEL
+
 #define DT_RTC_0_NAME                   DT_INST_0_ST_STM32_RTC_LABEL
 /* End of SoC Level DTS fixup file */

soc/arm/st_stm32/stm32l1/soc.h

@@ -51,6 +51,10 @@
 #include <stm32l1xx_ll_i2c.h>
 #endif
 
+#ifdef CONFIG_ADC_STM32
+#include <stm32l1xx_ll_adc.h>
+#endif
+
 #if defined(CONFIG_COUNTER_RTC_STM32)
 #include <stm32l1xx_ll_rtc.h>
 #include <stm32l1xx_ll_exti.h>