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drivers: gpio: Added support for raspberry pi
Signed-off-by: Yonatan Schachter <[email protected]>
1 parent 4b3b956 commit 0bdba34

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‎boards/arm/raspberrypi_pico/raspberrypi_pico.dts‎

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@@ -14,6 +14,18 @@
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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 {
@@ -29,3 +41,7 @@
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tx-pin = <0>;
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rx-pin = <1>;
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};
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&gpio0 {
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status = "okay";
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};

‎drivers/gpio/CMakeLists.txt‎

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@@ -26,6 +26,7 @@ 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_APL gpio_intel_apl.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_RASPBERRYPI gpio_raspberrypi.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_HT16K33 gpio_ht16k33.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_LMP90XXX gpio_lmp90xxx.c)

‎drivers/gpio/Kconfig‎

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@@ -67,6 +67,8 @@ source "drivers/gpio/Kconfig.xec"
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source "drivers/gpio/Kconfig.stellaris"
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source "drivers/gpio/Kconfig.raspberrypi"
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source "drivers/gpio/Kconfig.rv32m1"
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source "drivers/gpio/Kconfig.ht16k33"

‎drivers/gpio/Kconfig.raspberrypi‎

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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_RASPBERRYPI
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bool "Raspberry Pi GPIO driver"

‎drivers/gpio/gpio_raspberrypi.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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#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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#include "gpio_utils.h"
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#define DT_DRV_COMPAT raspberrypi_rp2_gpio
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#define IRQ_PRIORITY 0
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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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};
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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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} 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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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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uint32_t events = 0;
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struct gpio_raspberrypi_data *data = dev->data;
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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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if (trig & GPIO_INT_HIGH_1)
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events |= GPIO_IRQ_EDGE_RISE;
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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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if (trig & GPIO_INT_HIGH_1)
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events |= GPIO_IRQ_LEVEL_HIGH;
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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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uint32_t pin;
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uint32_t events;
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io_irq_ctrl_hw_t *irq_ctrl_base;
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io_rw_32 *status_reg;
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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_init(const struct device *dev)
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{
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IRQ_CONNECT(IO_IRQ_BANK0, IRQ_PRIORITY, gpio_raspberrypi_isr,
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DEVICE_DT_GET(DT_INST(0, raspberrypi_rp2_gpio)), 0);
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irq_enable(IO_IRQ_BANK0);
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return 0;
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}
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#define GPIO_RASPBERRYPI_INIT(idx) \
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static const struct gpio_raspberrypi_config gpio_raspberrypi_##idx##_config = { \
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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_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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@@ -46,6 +46,15 @@
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};
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soc {
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gpio0: gpio@40014000 {
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compatible = "raspberrypi,rp2-gpio";
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reg = <0x40014000 DT_SIZE_K(4)>;
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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,rp2-uart";
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reg = <0x40034000 DT_SIZE_K(4)>;

‎dts/bindings/gpio/raspberrypi,rp2-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 GPIO
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compatible: "raspberrypi,rp2-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

‎soc/arm/raspberrypi/rp2/Kconfig.defconfig.series‎

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@@ -42,5 +42,8 @@ config UART_RASPBERRYPI
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default y
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depends on SERIAL
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config GPIO_RASPBERRYPI
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default y
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depends on GPIO
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endif # SOC_SERIES_RP2XXX

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