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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>
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‎CODEOWNERS‎

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@@ -335,6 +335,7 @@
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/drivers/serial/uart_mcux_iuart.c @Mani-Sadhasivam
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/drivers/serial/Kconfig.rtt @carlescufi @pkral78
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/drivers/serial/uart_rtt.c @carlescufi @pkral78
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/drivers/serial/*rpi_pico* @yonsch
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/drivers/serial/Kconfig.xlnx @wjliang
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/drivers/serial/uart_xlnx_ps.c @wjliang
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/drivers/serial/uart_xlnx_uartlite.c @henrikbrixandersen

‎boards/arm/raspberrypi_pico/doc/index.rst‎

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@@ -45,4 +45,5 @@ hardware features:
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+-----------+------------+----------------------+
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| Interface | Controller | Driver/Component |
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+===========+============+======================+
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| UART | on-chip | serial port |
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+-----------+------------+----------------------+

‎boards/arm/raspberrypi_pico/raspberrypi_pico-pinctrl.dtsi‎

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#include <dt-bindings/pinctrl/rp2040-pinctrl.h>
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&pinctrl {
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uart0_default: uart0_default {
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group1 {
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pinmux = <UART0_TX_P0>;
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};
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group2 {
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pinmux = <UART0_RX_P1>;
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input-enable;
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};
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};
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};

‎boards/arm/raspberrypi_pico/raspberrypi_pico.dts‎

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chosen {
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zephyr,sram = &sram0;
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zephyr,flash = &flash0;
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zephyr,console = &uart0;
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};
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};
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@@ -22,3 +23,10 @@
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*/
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reg = <0x10000100 0x001fff00>;
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};
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&uart0 {
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current-speed = <115200>;
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status = "okay";
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pinctrl-0 = <&uart0_default>;
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pinctrl-names = "default";
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};

‎boards/arm/raspberrypi_pico/raspberrypi_pico.yaml‎

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@@ -8,3 +8,5 @@ toolchain:
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- zephyr
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- gnuarmemb
1010
- xtools
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supported:
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- serial

‎boards/arm/raspberrypi_pico/raspberrypi_pico_defconfig‎

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CONFIG_SOC_SERIES_RP2XXX=y
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CONFIG_SOC_RP2040=y
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CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=125000000
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CONFIG_SERIAL=y
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CONFIG_CONSOLE=y
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CONFIG_UART_CONSOLE=y

‎drivers/serial/CMakeLists.txt‎

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

‎drivers/serial/Kconfig‎

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source "drivers/serial/Kconfig.rv32m1_lpuart"
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source "drivers/serial/Kconfig.rpi_pico"
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source "drivers/serial/Kconfig.litex"
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source "drivers/serial/Kconfig.rtt"

‎drivers/serial/Kconfig.rpi_pico‎

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# Copyright (c) 2021 Yonatan Schachter
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# SPDX-License-Identifier: Apache-2.0
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config UART_RPI_PICO
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bool "Raspberry Pi UART driver"
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select SERIAL_HAS_DRIVER

‎drivers/serial/uart_rpi_pico.c‎

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

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