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drivers: gpio: Added support for raspberry pi
Added GPIO support for the RP2040 SoC. Only one core is supported. Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com>
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‎CODEOWNERS‎

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@@ -255,6 +255,7 @@
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/drivers/gpio/*eos_s3* @wtatarski @kowalewskijan @kgugala
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/drivers/gpio/*rcar* @julien-massot
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/drivers/gpio/*esp32* @glaubermaroto
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/drivers/gpio/*rpi_pico* @yonsch
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/drivers/hwinfo/ @alexanderwachter
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/drivers/i2c/i2c_common.c @sjg20
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/drivers/i2c/i2c_emul.c @sjg20

‎boards/arm/raspberrypi_pico/doc/index.rst‎

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@@ -47,3 +47,5 @@ hardware features:
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+===========+============+======================+
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| UART | on-chip | serial port |
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+-----------+------------+----------------------+
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| GPIO | on-chip | GPIO driver |
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+-----------+------------+----------------------+

‎boards/arm/raspberrypi_pico/raspberrypi_pico.dts‎

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zephyr,flash = &flash0;
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zephyr,console = &uart0;
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};
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leds {
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compatible = "gpio-leds";
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led0: led_0 {
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gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;
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label = "LED";
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};
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};
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aliases {
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led0 = &led0;
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};
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};
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&flash0 {
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pinctrl-0 = <&uart0_default>;
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pinctrl-names = "default";
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};
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&gpio0 {
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status = "okay";
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};

‎boards/arm/raspberrypi_pico/raspberrypi_pico.yaml‎

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@@ -10,3 +10,4 @@ toolchain:
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- xtools
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supported:
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- serial
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- gpio

‎drivers/gpio/CMakeLists.txt‎

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@@ -28,6 +28,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_SAM4L gpio_sam4l.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SX1509B gpio_sx1509b.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_INTEL gpio_intel.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_STELLARIS gpio_stellaris.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_RPI_PICO gpio_rpi_pico.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_RV32M1 gpio_rv32m1.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_LMP90XXX gpio_lmp90xxx.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_LITEX gpio_litex.c)

‎drivers/gpio/Kconfig‎

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@@ -77,6 +77,8 @@ source "drivers/gpio/Kconfig.xec"
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source "drivers/gpio/Kconfig.stellaris"
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source "drivers/gpio/Kconfig.rpi_pico"
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source "drivers/gpio/Kconfig.rv32m1"
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source "drivers/gpio/Kconfig.lmp90xxx"

‎drivers/gpio/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 GPIO_RPI_PICO
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bool "Raspberry Pi Pico GPIO driver"

‎drivers/gpio/gpio_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 <errno.h>
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#include <drivers/gpio.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/gpio.h>
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#include <hardware/regs/intctrl.h>
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#include <hardware/structs/iobank0.h>
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#pragma GCC diagnostic pop
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#include "gpio_utils.h"
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#define DT_DRV_COMPAT raspberrypi_pico_gpio
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#define ALL_EVENTS (GPIO_IRQ_EDGE_FALL | GPIO_IRQ_EDGE_RISE \
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| GPIO_IRQ_LEVEL_LOW | GPIO_IRQ_LEVEL_HIGH)
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struct gpio_raspberrypi_config {
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struct gpio_driver_config common;
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void (*bank_config_func)(void);
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};
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struct gpio_raspberrypi_data {
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struct gpio_driver_data common;
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sys_slist_t callbacks;
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uint32_t int_enabled_mask;
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};
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static int gpio_raspberrypi_configure(const struct device *dev,
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gpio_pin_t pin,
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gpio_flags_t flags)
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{
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if (flags & GPIO_SINGLE_ENDED) {
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return -ENOTSUP;
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}
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gpio_init(pin);
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if (flags & GPIO_OUTPUT) {
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gpio_set_dir(pin, GPIO_OUT);
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if (flags & GPIO_OUTPUT_INIT_HIGH) {
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gpio_put(pin, 1);
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} else if (flags & GPIO_OUTPUT_INIT_LOW) {
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gpio_put(pin, 0);
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}
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} else if (flags & GPIO_INPUT) {
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gpio_set_dir(pin, GPIO_IN);
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if (flags & GPIO_PULL_UP) {
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gpio_pull_up(pin);
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} else if (flags & GPIO_PULL_DOWN) {
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gpio_pull_down(pin);
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}
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}
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return 0;
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}
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static int gpio_raspberrypi_port_get_raw(const struct device *dev, uint32_t *value)
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{
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*value = gpio_get_all();
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return 0;
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}
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static int gpio_raspberrypi_port_set_masked_raw(const struct device *port,
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uint32_t mask, uint32_t value)
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{
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gpio_put_masked(mask, value);
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return 0;
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}
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static int gpio_raspberrypi_port_set_bits_raw(const struct device *port,
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uint32_t pins)
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{
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gpio_set_mask(pins);
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return 0;
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}
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static int gpio_raspberrypi_port_clear_bits_raw(const struct device *port,
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uint32_t pins)
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{
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gpio_clr_mask(pins);
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return 0;
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}
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static int gpio_raspberrypi_port_toggle_bits(const struct device *port,
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uint32_t pins)
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{
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gpio_xor_mask(pins);
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return 0;
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}
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static int gpio_raspberrypi_pin_interrupt_configure(const struct device *dev,
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gpio_pin_t pin,
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enum gpio_int_mode mode,
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enum gpio_int_trig trig)
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{
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struct gpio_raspberrypi_data *data = dev->data;
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uint32_t events = 0;
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if (mode != GPIO_INT_DISABLE) {
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if (mode & GPIO_INT_EDGE) {
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if (trig & GPIO_INT_LOW_0) {
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events |= GPIO_IRQ_EDGE_FALL;
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}
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if (trig & GPIO_INT_HIGH_1) {
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events |= GPIO_IRQ_EDGE_RISE;
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}
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} else {
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if (trig & GPIO_INT_LOW_0) {
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events |= GPIO_IRQ_LEVEL_LOW;
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}
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if (trig & GPIO_INT_HIGH_1) {
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events |= GPIO_IRQ_LEVEL_HIGH;
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}
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}
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gpio_set_irq_enabled(pin, events, true);
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}
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WRITE_BIT(data->int_enabled_mask, pin, mode != GPIO_INT_DISABLE);
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return 0;
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}
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static int gpio_raspberrypi_manage_callback(const struct device *dev,
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struct gpio_callback *callback, bool set)
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{
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struct gpio_raspberrypi_data *data = dev->data;
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return gpio_manage_callback(&data->callbacks, callback, set);
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}
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static const struct gpio_driver_api gpio_raspberrypi_driver_api = {
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.pin_configure = gpio_raspberrypi_configure,
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.port_get_raw = gpio_raspberrypi_port_get_raw,
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.port_set_masked_raw = gpio_raspberrypi_port_set_masked_raw,
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.port_set_bits_raw = gpio_raspberrypi_port_set_bits_raw,
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.port_clear_bits_raw = gpio_raspberrypi_port_clear_bits_raw,
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.port_toggle_bits = gpio_raspberrypi_port_toggle_bits,
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.pin_interrupt_configure = gpio_raspberrypi_pin_interrupt_configure,
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.manage_callback = gpio_raspberrypi_manage_callback,
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};
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static void gpio_raspberrypi_isr(const struct device *dev)
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{
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struct gpio_raspberrypi_data *data = dev->data;
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io_irq_ctrl_hw_t *irq_ctrl_base;
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const io_rw_32 *status_reg;
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uint32_t events;
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uint32_t pin;
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irq_ctrl_base = &iobank0_hw->proc0_irq_ctrl;
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for (pin = 0; pin < NUM_BANK0_GPIOS; pin++) {
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status_reg = &irq_ctrl_base->ints[pin / 8];
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events = (*status_reg >> 4 * (pin % 8)) & ALL_EVENTS;
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if (events) {
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gpio_acknowledge_irq(pin, ALL_EVENTS);
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gpio_fire_callbacks(&data->callbacks, dev, BIT(pin));
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}
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}
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}
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static int gpio_raspberrypi_bank_init(const struct device *dev)
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{
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((struct gpio_raspberrypi_config *)(dev->config))->bank_config_func();
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return 0;
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}
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#define GPIO_RASPBERRYPI_INIT(idx) \
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static void bank_##idx##_config_func(void) \
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{ \
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IRQ_CONNECT(DT_INST_IRQN(idx), DT_INST_IRQ(idx, priority), \
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gpio_raspberrypi_isr, DEVICE_DT_INST_GET(idx), 0); \
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irq_enable(DT_INST_IRQN(idx)); \
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} \
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static const struct gpio_raspberrypi_config gpio_raspberrypi_##idx##_config = { \
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.bank_config_func = bank_##idx##_config_func, \
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}; \
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\
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static struct gpio_raspberrypi_data gpio_raspberrypi_##idx##_data; \
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\
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DEVICE_DT_INST_DEFINE(idx, gpio_raspberrypi_bank_init, NULL, \
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&gpio_raspberrypi_##idx##_data, \
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&gpio_raspberrypi_##idx##_config, \
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, \
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&gpio_raspberrypi_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(GPIO_RASPBERRYPI_INIT)

‎dts/arm/raspberrypi/rp2040.dtsi‎

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*/
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#include <arm/armv6-m.dtsi>
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#include <dt-bindings/gpio/gpio.h>
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#include <mem.h>
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/ {
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label = "PINCTRL";
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};
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gpio0: gpio@40014000 {
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compatible = "raspberrypi,pico-gpio";
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reg = <0x40014000 DT_SIZE_K(4)>;
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interrupts = <13 3>;
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gpio-controller;
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#gpio-cells = <2>;
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label = "GPIO_0";
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status = "disabled";
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};
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uart0: uart@40034000 {
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compatible = "raspberrypi,pico-uart";
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reg = <0x40034000 DT_SIZE_K(4)>;

‎dts/bindings/gpio/raspberrypi,pico-gpio.yaml‎

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# Copyright (c) 2021, Yonatan Schachter
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# SPDX-License-Identifier: Apache-2.0
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description: Raspberry Pi Pico GPIO
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compatible: "raspberrypi,pico-gpio"
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include: [gpio-controller.yaml, base.yaml]
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properties:
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reg:
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required: true
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label:
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required: true
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"#gpio-cells":
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const: 2
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gpio-cells:
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- pin
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- flags

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