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>
diff --git a/CODEOWNERS b/CODEOWNERS
index d40046f..4ba97bc 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -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
diff --git a/drivers/serial/CMakeLists.txt b/drivers/serial/CMakeLists.txt
index acb5195..5eef4ea 100644
--- a/drivers/serial/CMakeLists.txt
+++ b/drivers/serial/CMakeLists.txt
@@ -32,6 +32,7 @@
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)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 2455174..3d11054 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -159,6 +159,8 @@
source "drivers/serial/Kconfig.rv32m1_lpuart"
+source "drivers/serial/Kconfig.rpi_pico"
+
source "drivers/serial/Kconfig.litex"
source "drivers/serial/Kconfig.rtt"
diff --git a/drivers/serial/Kconfig.rpi_pico b/drivers/serial/Kconfig.rpi_pico
new file mode 100644
index 0000000..bab871b
--- /dev/null
+++ b/drivers/serial/Kconfig.rpi_pico
@@ -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
diff --git a/drivers/serial/uart_rpi_pico.c b/drivers/serial/uart_rpi_pico.c
new file mode 100644
index 0000000..b0f4e28
--- /dev/null
+++ b/drivers/serial/uart_rpi_pico.c
@@ -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)
diff --git a/dts/arm/rpi_pico/rp2040.dtsi b/dts/arm/rpi_pico/rp2040.dtsi
index 9cbe7c4..dd48076 100644
--- a/dts/arm/rpi_pico/rp2040.dtsi
+++ b/dts/arm/rpi_pico/rp2040.dtsi
@@ -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";
+ };
};
};
diff --git a/dts/bindings/serial/raspberrypi,pico-uart.yaml b/dts/bindings/serial/raspberrypi,pico-uart.yaml
new file mode 100644
index 0000000..50c3bd4
--- /dev/null
+++ b/dts/bindings/serial/raspberrypi,pico-uart.yaml
@@ -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
