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drivers: serial: stm32: add LPUART support for L0/L4 series

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LPUART (Low-power UART) peripheral is just like ordinary U(S)ART
which lives in a separate clock/power domain.
Therefore already existing code could be reused as is
almost entirely.

Signed-off-by: Ilya Tagunov <tagunil@gmail.com>
This commit is contained in:
Ilya Tagunov 2018-04-11 17:10:47 +03:00 • committed by Kumar Gala
commit 1e6d827a53
9 changed files with 132 additions and 8 deletions
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6
arch/arm/soc/st_stm32/stm32l0/dts.fixup
View file

@ -14,6 +14,12 @@
#define CONFIG_UART_STM32_USART_2_NAME ST_STM32_USART_40004400_LABEL
#define USART_2_IRQ ST_STM32_USART_40004400_IRQ_0
#define CONFIG_UART_STM32_LPUART_1_BASE_ADDRESS ST_STM32_LPUART_40004800_BASE_ADDRESS
#define CONFIG_UART_STM32_LPUART_1_BAUD_RATE ST_STM32_LPUART_40004800_CURRENT_SPEED
#define CONFIG_UART_STM32_LPUART_1_IRQ_PRI ST_STM32_LPUART_40004800_IRQ_0_PRIORITY
#define CONFIG_UART_STM32_LPUART_1_NAME ST_STM32_LPUART_40004800_LABEL
#define LPUART_1_IRQ ST_STM32_LPUART_40004800_IRQ_0
#define CONFIG_I2C_1_BASE_ADDRESS ST_STM32_I2C_V2_40005400_BASE_ADDRESS
#define CONFIG_I2C_1_COMBINED_IRQ_PRI ST_STM32_I2C_V2_40005400_IRQ_COMBINED_PRIORITY
#define CONFIG_I2C_1_NAME ST_STM32_I2C_V2_40005400_LABEL

1
arch/arm/soc/st_stm32/stm32l0/soc.h
View file

@ -35,6 +35,7 @@
#ifdef CONFIG_SERIAL_HAS_DRIVER
#include <stm32l0xx_ll_usart.h>
#include <stm32l0xx_ll_lpuart.h>
#endif
#ifdef CONFIG_CLOCK_CONTROL_STM32_CUBE

6
arch/arm/soc/st_stm32/stm32l4/dts.fixup
View file

@ -32,6 +32,12 @@
#define CONFIG_UART_STM32_UART_5_NAME ST_STM32_UART_40005000_LABEL
#define UART_5_IRQ ST_STM32_UART_40005000_IRQ_0
#define CONFIG_UART_STM32_LPUART_1_BASE_ADDRESS ST_STM32_LPUART_40008000_BASE_ADDRESS
#define CONFIG_UART_STM32_LPUART_1_BAUD_RATE ST_STM32_LPUART_40008000_CURRENT_SPEED
#define CONFIG_UART_STM32_LPUART_1_IRQ_PRI ST_STM32_LPUART_40008000_IRQ_0_PRIORITY
#define CONFIG_UART_STM32_LPUART_1_NAME ST_STM32_LPUART_40008000_LABEL
#define LPUART_1_IRQ ST_STM32_LPUART_40008000_IRQ_0
#define CONFIG_I2C_1_BASE_ADDRESS ST_STM32_I2C_V2_40005400_BASE_ADDRESS
#define CONFIG_I2C_1_EVENT_IRQ_PRI ST_STM32_I2C_V2_40005400_IRQ_EVENT_PRIORITY
#define CONFIG_I2C_1_ERROR_IRQ_PRI ST_STM32_I2C_V2_40005400_IRQ_ERROR_PRIORITY

1
arch/arm/soc/st_stm32/stm32l4/soc.h
View file

@ -33,6 +33,7 @@
#ifdef CONFIG_SERIAL_HAS_DRIVER
#include <stm32l4xx_ll_usart.h>
#include <stm32l4xx_ll_lpuart.h>
#endif
#ifdef CONFIG_CLOCK_CONTROL_STM32_CUBE

14
drivers/serial/Kconfig.stm32
View file

@ -118,4 +118,18 @@ config UART_STM32_PORT_10
Enable support for UART10 port in the driver.
Say y here if you want to use UART10 device.
if SOC_SERIES_STM32L0X || SOC_SERIES_STM32L4X
# --- low power port 1 ---
config UART_STM32_LPUART_1
bool "Enable STM32 LPUART1 Port"
default n
depends on UART_STM32
help
Enable support for LPUART1 port in the driver.
Say y here if you want to use LPUART1 device.
endif # SOC_SERIES_STM32L0X || SOC_SERIES_STM32L4X
endif # UART_STM32

58
drivers/serial/uart_stm32.c
View file

@ -247,6 +247,37 @@ static const struct uart_driver_api uart_stm32_driver_api = {
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
static void uart_stm32_usart_set_baud_rate(struct device *dev,
u32_t clock_rate, u32_t baud_rate)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
LL_USART_SetBaudRate(UartInstance,
clock_rate,
#ifdef USART_PRESC_PRESCALER
LL_USART_PRESCALER_DIV1,
#endif
#ifdef USART_CR1_OVER8
LL_USART_OVERSAMPLING_16,
#endif
baud_rate);
}
#if defined(CONFIG_SOC_SERIES_STM32L0X) || defined(CONFIG_SOC_SERIES_STM32L4X)
static void uart_stm32_lpuart_set_baud_rate(struct device *dev,
u32_t clock_rate, u32_t baud_rate)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
LL_LPUART_SetBaudRate(UartInstance,
clock_rate,
#ifdef USART_PRESC_PRESCALER
LL_USART_PRESCALER_DIV1,
#endif
baud_rate);
}
#endif
/**
* @brief Initialize UART channel
*
@ -263,6 +294,7 @@ static int uart_stm32_init(struct device *dev)
struct uart_stm32_data *data = DEV_DATA(dev);
USART_TypeDef *UartInstance = UART_STRUCT(dev);
u32_t baud_rate = config->baud_rate;
u32_t clock_rate;
__uart_stm32_get_clock(dev);
@ -287,15 +319,15 @@ static int uart_stm32_init(struct device *dev)
(clock_control_subsys_t *)&config->pclken,
&clock_rate);
LL_USART_SetBaudRate(UartInstance,
clock_rate,
#ifdef USART_PRESC_PRESCALER
LL_USART_PRESCALER_DIV1,
#if defined(CONFIG_SOC_SERIES_STM32L0X) || defined(CONFIG_SOC_SERIES_STM32L4X)
if (IS_LPUART_INSTANCE(UartInstance)) {
uart_stm32_lpuart_set_baud_rate(dev, clock_rate, baud_rate);
} else {
uart_stm32_usart_set_baud_rate(dev, clock_rate, baud_rate);
}
#else
uart_stm32_usart_set_baud_rate(dev, clock_rate, baud_rate);
#endif
#ifdef USART_CR1_OVER8
LL_USART_OVERSAMPLING_16,
#endif
config->baud_rate);
LL_USART_Enable(UartInstance);
@ -417,6 +449,10 @@ STM32_UART_INIT(USART_4, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_USART4)
STM32_UART_INIT(USART_5, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_USART5)
#endif /* CONFIG_UART_STM32_PORT_5 */
#ifdef CONFIG_UART_STM32_LPUART_1
STM32_UART_INIT(LPUART_1, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_LPUART1)
#endif /* CONFIG_UART_STM32_LPUART_1 */
#else
#ifdef CONFIG_UART_STM32_PORT_1
@ -459,4 +495,10 @@ STM32_UART_INIT(UART_9, STM32_CLOCK_BUS_APB2, LL_APB2_GRP1_PERIPH_UART9)
STM32_UART_INIT(UART_10, STM32_CLOCK_BUS_APB2, LL_APB2_GRP1_PERIPH_UART10)
#endif /* CONFIG_UART_STM32_PORT_10 */
#ifdef CONFIG_SOC_SERIES_STM32L4X
#ifdef CONFIG_UART_STM32_LPUART_1
STM32_UART_INIT(LPUART_1, STM32_CLOCK_BUS_APB1_2, LL_APB1_GRP2_PERIPH_LPUART1)
#endif /* CONFIG_UART_STM32_LPUART_1 */
#endif /* CONFIG_SOC_SERIES_STM32L4X */
#endif

9
dts/arm/st/stm32l0.dtsi
View file

@ -126,6 +126,15 @@
label = "UART_2";
};
lpuart1: serial@40004800 {
compatible = "st,stm32-lpuart", "st,stm32-uart";
reg = <0x40004800 0x400>;
clocks = <&rcc STM32_CLOCK_BUS_APB1 0x00040000>;
interrupts = <29 0>;
status = "disabled";
label = "LPUART_1";
};
i2c1: i2c@40005400 {
compatible = "st,stm32-i2c-v2";
clock-frequency = <I2C_BITRATE_STANDARD>;

9
dts/arm/st/stm32l4.dtsi
View file

@ -127,6 +127,15 @@
label = "UART_3";
};
lpuart1: serial@40008000 {
compatible = "st,stm32-lpuart", "st,stm32-uart";
reg = <0x40008000 0x400>;
clocks = <&rcc STM32_CLOCK_BUS_APB1_2 0x00000001>;
interrupts = <70 0>;
status = "disabled";
label = "LPUART_1";
};
i2c1: i2c@40005400 {
compatible = "st,stm32-i2c-v2";
clock-frequency = <I2C_BITRATE_STANDARD>;

36
dts/bindings/serial/st,stm32-lpuart.yaml Normal file
View file

@ -0,0 +1,36 @@
---
title: STM32 LPUART
id: st,stm32-lpuart
version: 0.1
description: >
This binding gives a base representation of the STM32 LPUART
inherits:
!include uart.yaml
properties:
compatible:
type: string
category: required
description: compatible strings
constraint: "st,stm32-lpuart"
reg:
type: array
description: mmio register space
generation: define
category: required
interrupts:
type: array
category: required
description: required interrupts
generation: define
clocks:
type: array
category: required
description: Clock gate control information
generation: define
...