drivers: serial: Added support for raspberry pi

Added a serial driver for the RP2040. Only polling
API is supported.

Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com>
This commit is contained in:
Yonatan Schachter 2021-11-30 00:40:43 +02:00 committed by Carles Cufí
commit cd7bd5f450
7 changed files with 122 additions and 0 deletions

View file

@ -354,6 +354,7 @@
/drivers/serial/uart_mcux_iuart.c @Mani-Sadhasivam
/drivers/serial/Kconfig.rtt @carlescufi @pkral78
/drivers/serial/uart_rtt.c @carlescufi @pkral78
/drivers/serial/*rpi_pico* @yonsch
/drivers/serial/Kconfig.xlnx @wjliang
/drivers/serial/uart_xlnx_ps.c @wjliang
/drivers/serial/uart_xlnx_uartlite.c @henrikbrixandersen

View file

@ -32,6 +32,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_SAM0 uart_sam0.c)
zephyr_library_sources_ifdef(CONFIG_UART_PSOC6 uart_psoc6.c)
zephyr_library_sources_ifdef(CONFIG_UART_PL011 uart_pl011.c)
zephyr_library_sources_ifdef(CONFIG_UART_RV32M1_LPUART uart_rv32m1_lpuart.c)
zephyr_library_sources_ifdef(CONFIG_UART_RPI_PICO uart_rpi_pico.c)
zephyr_library_sources_ifdef(CONFIG_UART_LITEUART uart_liteuart.c)
zephyr_library_sources_ifdef(CONFIG_UART_RTT_DRIVER uart_rtt.c)
zephyr_library_sources_ifdef(CONFIG_UART_XLNX_PS uart_xlnx_ps.c)

View file

@ -159,6 +159,8 @@ source "drivers/serial/Kconfig.pl011"
source "drivers/serial/Kconfig.rv32m1_lpuart"
source "drivers/serial/Kconfig.rpi_pico"
source "drivers/serial/Kconfig.litex"
source "drivers/serial/Kconfig.rtt"

View file

@ -0,0 +1,11 @@
# Copyright (c) 2021 Yonatan Schachter
# SPDX-License-Identifier: Apache-2.0
# Workaround for not being able to have commas in macro arguments
DT_COMPAT_RPI_PICO_UART := raspberrypi,pico-uart
config UART_RPI_PICO
bool "Raspberry Pi UART driver"
default $(dt_compat_enabled,$(DT_COMPAT_RPI_PICO_UART))
select SERIAL_HAS_DRIVER
select PICOSDK_USE_UART

View file

@ -0,0 +1,75 @@
/*
* Copyright (c) 2021, Yonatan Schachter
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <drivers/uart.h>
#include <drivers/pinctrl.h>
/* pico-sdk includes */
#include <hardware/uart.h>
#define DT_DRV_COMPAT raspberrypi_pico_uart
struct uart_rpi_config {
uart_inst_t *const uart_dev;
uint32_t baudrate;
const struct pinctrl_dev_config *pcfg;
};
static int uart_rpi_poll_in(const struct device *dev, unsigned char *c)
{
const struct uart_rpi_config *config = dev->config;
if (!uart_is_readable(config->uart_dev)) {
return -1;
}
*c = (unsigned char)uart_get_hw(config->uart_dev)->dr;
return 0;
}
static void uart_rpi_poll_out(const struct device *dev, unsigned char c)
{
const struct uart_rpi_config *config = dev->config;
uart_putc_raw(config->uart_dev, c);
}
static int uart_rpi_init(const struct device *dev)
{
const struct uart_rpi_config *config = dev->config;
int ret;
ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
if (ret < 0) {
return ret;
}
uart_init(config->uart_dev, config->baudrate);
return 0;
}
static const struct uart_driver_api uart_rpi_driver_api = {
.poll_in = uart_rpi_poll_in,
.poll_out = uart_rpi_poll_out,
};
#define RPI_UART_INIT(idx) \
PINCTRL_DT_INST_DEFINE(idx); \
static const struct uart_rpi_config uart_rpi_cfg_##idx = { \
.uart_dev = (uart_inst_t *)DT_INST_REG_ADDR(idx), \
.baudrate = DT_INST_PROP(idx, current_speed), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \
}; \
\
DEVICE_DT_INST_DEFINE(idx, &uart_rpi_init, \
NULL, \
NULL, \
&uart_rpi_cfg_##idx, PRE_KERNEL_1, \
CONFIG_SERIAL_INIT_PRIORITY, \
&uart_rpi_driver_api);
DT_INST_FOREACH_STATUS_OKAY(RPI_UART_INIT)

View file

@ -50,6 +50,26 @@
status = "okay";
label = "PINCTRL";
};
uart0: uart@40034000 {
compatible = "raspberrypi,pico-uart";
reg = <0x40034000 DT_SIZE_K(4)>;
clocks = <&peripheral_clk>;
interrupts = <20 RPI_PICO_DEFAULT_IRQ_PRIORITY>;
interrupt-names = "uart0";
label = "UART_0";
status = "disabled";
};
uart1: uart@40038000 {
compatible = "raspberrypi,pico-uart";
reg = <0x40038000 DT_SIZE_K(4)>;
clocks = <&peripheral_clk>;
interrupts = <21 RPI_PICO_DEFAULT_IRQ_PRIORITY>;
interrupt-names = "uart1";
label = "UART_1";
status = "disabled";
};
};
};

View file

@ -0,0 +1,12 @@
description: Raspberry Pi Pico UART
compatible: "raspberrypi,pico-uart"
include: [uart-controller.yaml, pinctrl-device.yaml]
properties:
reg:
required: true
interrupts:
required: true