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drivers: misc: Add driver for RaspberryPi Pico PIO
Added a generic driver for RaspberryPi Pico PIO. This driver is an intermediate driver for abstracting the PIO device driver from physical pin configuration. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@fujitsu.com> Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com> Signed-off-by: Ionut Catalin Pavel <iocapa@iocapa.com>
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‎drivers/misc/CMakeLists.txt‎

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@@ -3,3 +3,4 @@
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add_subdirectory_ifdef(CONFIG_ARM_ETHOS_U ethos_u)
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add_subdirectory_ifdef(CONFIG_FT800 ft8xx)
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add_subdirectory_ifdef(CONFIG_GROVE_LCD_RGB grove_lcd_rgb)
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add_subdirectory_ifdef(CONFIG_PIO_RPI_PICO pio_rpi_pico)

‎drivers/misc/Kconfig‎

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@@ -7,5 +7,6 @@ menu "Miscellaneous Drivers"
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source "drivers/misc/ft8xx/Kconfig"
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source "drivers/misc/grove_lcd_rgb/Kconfig"
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source "drivers/misc/pio_rpi_pico/Kconfig"
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endmenu

‎drivers/misc/pio_rpi_pico/CMakeLists.txt‎

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# Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
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# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources(pio_rpi_pico.c)

‎drivers/misc/pio_rpi_pico/Kconfig‎

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# Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
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# SPDX-License-Identifier: Apache-2.0
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config PIO_RPI_PICO
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bool "RaspberryPi Pico PIO"
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default y
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depends on DT_HAS_RASPBERRYPI_PICO_PIO_ENABLED
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depends on RESET
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select PICOSDK_USE_PIO

‎drivers/misc/pio_rpi_pico/pio_rpi_pico.c‎

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/*
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* Copyright (c) 2023 Tokita, Hiroshi <tokita.hiroshi@fujitsu.com>
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* Copyright (c) 2023 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 <zephyr/device.h>
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#include <zephyr/drivers/misc/pio_rpi_pico/pio_rpi_pico.h>
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#include <zephyr/drivers/pinctrl.h>
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#define DT_DRV_COMPAT raspberrypi_pico_pio
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struct pio_rpi_pico_config {
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PIO pio;
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};
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int pio_rpi_pico_allocate_sm(const struct device *dev, size_t *sm)
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{
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const struct pio_rpi_pico_config *config = dev->config;
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int retval;
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retval = pio_claim_unused_sm(config->pio, false);
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if (retval < 0) {
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return -EBUSY;
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}
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*sm = (size_t)retval;
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return 0;
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}
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PIO pio_rpi_pico_get_pio(const struct device *dev)
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{
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const struct pio_rpi_pico_config *config = dev->config;
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return config->pio;
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}
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static int pio_rpi_pico_init(const struct device *dev)
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{
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return 0;
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}
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#define RPI_PICO_PIO_INIT(idx) \
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static const struct pio_rpi_pico_config pio_rpi_pico_config_##idx = { \
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.pio = (PIO)DT_INST_REG_ADDR(idx), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(idx, &pio_rpi_pico_init, NULL, NULL, \
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&pio_rpi_pico_config_##idx, PRE_KERNEL_2, \
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, NULL);
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DT_INST_FOREACH_STATUS_OKAY(RPI_PICO_PIO_INIT)

‎dts/arm/rpi_pico/rp2040.dtsi‎

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raspberrypi,brown-out-detection;
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raspberrypi,brown-out-threshold = <860000>;
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};
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pio0: pio@50200000 {
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compatible = "raspberrypi,pico-pio";
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reg = <0x50200000 DT_SIZE_K(4)>;
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clocks = <&system_clk>;
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resets = <&reset RPI_PICO_RESETS_RESET_PIO0>;
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status = "disabled";
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};
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pio1: pio@50300000 {
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compatible = "raspberrypi,pico-pio";
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reg = <0x50300000 DT_SIZE_K(4)>;
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clocks = <&system_clk>;
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resets = <&reset RPI_PICO_RESETS_RESET_PIO1>;
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status = "disabled";
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};
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};
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pinctrl: pin-controller {

‎dts/bindings/misc/raspberrypi,pico-pio-device.yaml‎

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# Copyright (c) 2023, TOKITA Hiroshi
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# Copyright (c) 2023, Yonatan Schachter
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# SPDX-License-Identifier: Apache-2.0
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description: Raspberry Pi Pico PIO device
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compatible: "raspberrypi,pico-pio-device"
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include: pinctrl-device.yaml

‎dts/bindings/misc/raspberrypi,pico-pio.yaml‎

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# Copyright (c) 2023, TOKITA Hiroshi
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# SPDX-License-Identifier: Apache-2.0
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description: Raspberry Pi Pico PIO
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compatible: "raspberrypi,pico-pio"
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include: [base.yaml, reset-device.yaml]

‎include/zephyr/drivers/misc/pio_rpi_pico/pio_rpi_pico.h‎

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/*
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* Copyright (c) 2023 Tokita, Hiroshi <tokita.hiroshi@fujitsu.com>
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* Copyright (c) 2023 Yonatan Schachter
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* Copyright (c) 2023 Ionut Pavel <iocapa@iocapa.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_MISC_PIO_PICO_RPI_PIO_PICO_RPI_H_
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#define ZEPHYR_DRIVERS_MISC_PIO_PICO_RPI_PIO_PICO_RPI_H_
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#include <zephyr/devicetree/gpio.h>
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#include <hardware/pio.h>
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/**
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* @brief Utility macro to define a PIO program. The program is a list
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* of 16 bit instructions, generated by the pioasm tool.
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*
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* @param name Name of the program.
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* @param wrap_target Wrap target as specified by the PIO program.
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* @param wrap Wrap source as specified by the PIO program.
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* @param ... Comma separated list of PIO instructions.
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*/
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#define RPI_PICO_PIO_DEFINE_PROGRAM(name, wrap_target, wrap, ...) \
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static const uint32_t name ## _wrap_target = wrap_target; \
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static const uint32_t name ## _wrap = wrap; \
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static const uint16_t name ## _program_instructions[] = { \
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__VA_ARGS__ \
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}; \
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static const struct pio_program name ## _program = { \
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.instructions = name ## _program_instructions, \
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.length = ARRAY_SIZE(name ## _program_instructions), \
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.origin = -1, \
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}
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/**
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* @brief Utility macro to get the wrap target of a program.
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*
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* @param name Name of the program.
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*/
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#define RPI_PICO_PIO_GET_WRAP_TARGET(name) name ## _wrap_target
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/**
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* @brief Utility macro to get the wrap source of a program.
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*
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* @param name Name of the program.
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*/
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#define RPI_PICO_PIO_GET_WRAP(name) name ## _wrap
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/**
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* @brief Utility macro to get a pointer to a PIO program.
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*
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* @param name Name of the program.
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*/
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#define RPI_PICO_PIO_GET_PROGRAM(name) &name ## _program
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/**
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* @brief Get a pin number from a pinctrl / group name and index
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*
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* Example devicetree fragment(s):
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*
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* @code{.dts}
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* pinctrl {
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* pio_child_default: pio_child_default {
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* tx_gpio {
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* pinmux = <PIO0_P0>, <PIO0_P2>;
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* };
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*
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* rx_gpio {
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* pinmux = <PIO0_P1>;
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* input-enable;
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* };
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* };
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* };
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* @endcode
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*
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* @code{.dts}
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* pio {
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* status = "okay";
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* c: child {
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* pinctrl-0 = <&pio_child_default>;
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* pinctrl-names = "default";
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* };
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* };
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* @endcode
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*
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* Example usage:
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*
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* @code{.c}
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* DT_RPI_PICO_PIO_PIN_BY_NAME(node, default, 0, tx_gpio, 0) // 0
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* DT_RPI_PICO_PIO_PIN_BY_NAME(node, default, 0, tx_gpio, 1) // 2
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* DT_RPI_PICO_PIO_PIN_BY_NAME(node, default, 0, rx_gpio, 0) // 1
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* @endcode
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*
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* @param node_id node identifier
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* @param p_name pinctrl name
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* @param p_idx pinctrl index
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* @param g_name group name
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* @param g_idx group index
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* @return pin number
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*/
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#define DT_RPI_PICO_PIO_PIN_BY_NAME(node_id, p_name, p_idx, g_name, g_idx) \
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RP2_GET_PIN_NUM(DT_PROP_BY_IDX( \
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DT_CHILD(DT_PINCTRL_BY_NAME(node_id, p_name, p_idx), g_name), pinmux, g_idx))
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/**
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* @brief Get a pin number from a pinctrl / group name and index
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*
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* @param inst instance number
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* @param p_name pinctrl name
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* @param p_idx pinctrl index
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* @param g_name group name
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* @param g_idx group index
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* @return pin number
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*
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* @see DT_RPI_PICO_PIO_PIN_BY_NAME
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*/
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#define DT_INST_RPI_PICO_PIO_PIN_BY_NAME(inst, p_name, p_idx, g_name, g_idx) \
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DT_RPI_PICO_PIO_PIN_BY_NAME(DT_DRV_INST(inst), p_name, p_idx, g_name, g_idx)
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/**
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* @brief Get the pin number of a pin by its name.
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*
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* @param name Name of the pin (e.g. tx, rx, sck).
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*/
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#define DT_INST_PIO_PIN_BY_NAME(inst, name) \
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DT_PIO_PIN_BY_NAME(DT_DRV_INST(inst), name)
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/**
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* Get PIO object
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*
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* @param dev Pointer to device structure for rpi_pio device instance
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* @return PIO object
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*/
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PIO pio_rpi_pico_get_pio(const struct device *dev);
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/**
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* Allocate a state machine.
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*
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* @param dev Pointer to device structure for rpi_pio device instance
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* @param sm Pointer to store allocated state machine
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* @retval 0 on success
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* @retval -EBUSY if no state machines were available
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*/
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int pio_rpi_pico_allocate_sm(const struct device *dev, size_t *sm);
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#endif /* ZEPHYR_DRIVERS_MISC_PIO_PICO_RPI_PIO_PICO_RPI_H_ */

‎include/zephyr/dt-bindings/pinctrl/rpi-pico-rp2040-pinctrl.h‎

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#define ADC_CH2_P28 RP2040_PINMUX(28, RP2_PINCTRL_GPIO_FUNC_NULL)
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#define ADC_CH3_P29 RP2040_PINMUX(29, RP2_PINCTRL_GPIO_FUNC_NULL)
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#define PIO0_P0 RP2040_PINMUX(0, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P1 RP2040_PINMUX(1, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P2 RP2040_PINMUX(2, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P3 RP2040_PINMUX(3, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P4 RP2040_PINMUX(4, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P5 RP2040_PINMUX(5, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P6 RP2040_PINMUX(6, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P7 RP2040_PINMUX(7, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P8 RP2040_PINMUX(8, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P9 RP2040_PINMUX(9, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P10 RP2040_PINMUX(10, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P11 RP2040_PINMUX(11, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P12 RP2040_PINMUX(12, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P13 RP2040_PINMUX(13, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P14 RP2040_PINMUX(14, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P15 RP2040_PINMUX(15, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P16 RP2040_PINMUX(16, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P17 RP2040_PINMUX(17, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P18 RP2040_PINMUX(18, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P19 RP2040_PINMUX(19, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P20 RP2040_PINMUX(20, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P21 RP2040_PINMUX(21, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P22 RP2040_PINMUX(22, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P23 RP2040_PINMUX(23, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P24 RP2040_PINMUX(24, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P25 RP2040_PINMUX(25, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P26 RP2040_PINMUX(26, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P27 RP2040_PINMUX(27, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P28 RP2040_PINMUX(28, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO0_P29 RP2040_PINMUX(29, RP2_PINCTRL_GPIO_FUNC_PIO0)
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#define PIO1_P0 RP2040_PINMUX(0, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P1 RP2040_PINMUX(1, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P2 RP2040_PINMUX(2, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P3 RP2040_PINMUX(3, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P4 RP2040_PINMUX(4, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P5 RP2040_PINMUX(5, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P6 RP2040_PINMUX(6, RP2_PINCTRL_GPIO_FUNC_PIO1)
198+
#define PIO1_P7 RP2040_PINMUX(7, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P8 RP2040_PINMUX(8, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P9 RP2040_PINMUX(9, RP2_PINCTRL_GPIO_FUNC_PIO1)
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#define PIO1_P10 RP2040_PINMUX(10, RP2_PINCTRL_GPIO_FUNC_PIO1)
202+
#define PIO1_P11 RP2040_PINMUX(11, RP2_PINCTRL_GPIO_FUNC_PIO1)
203+
#define PIO1_P12 RP2040_PINMUX(12, RP2_PINCTRL_GPIO_FUNC_PIO1)
204+
#define PIO1_P13 RP2040_PINMUX(13, RP2_PINCTRL_GPIO_FUNC_PIO1)
205+
#define PIO1_P14 RP2040_PINMUX(14, RP2_PINCTRL_GPIO_FUNC_PIO1)
206+
#define PIO1_P15 RP2040_PINMUX(15, RP2_PINCTRL_GPIO_FUNC_PIO1)
207+
#define PIO1_P16 RP2040_PINMUX(16, RP2_PINCTRL_GPIO_FUNC_PIO1)
208+
#define PIO1_P17 RP2040_PINMUX(17, RP2_PINCTRL_GPIO_FUNC_PIO1)
209+
#define PIO1_P18 RP2040_PINMUX(18, RP2_PINCTRL_GPIO_FUNC_PIO1)
210+
#define PIO1_P19 RP2040_PINMUX(19, RP2_PINCTRL_GPIO_FUNC_PIO1)
211+
#define PIO1_P20 RP2040_PINMUX(20, RP2_PINCTRL_GPIO_FUNC_PIO1)
212+
#define PIO1_P21 RP2040_PINMUX(21, RP2_PINCTRL_GPIO_FUNC_PIO1)
213+
#define PIO1_P22 RP2040_PINMUX(22, RP2_PINCTRL_GPIO_FUNC_PIO1)
214+
#define PIO1_P23 RP2040_PINMUX(23, RP2_PINCTRL_GPIO_FUNC_PIO1)
215+
#define PIO1_P24 RP2040_PINMUX(24, RP2_PINCTRL_GPIO_FUNC_PIO1)
216+
#define PIO1_P25 RP2040_PINMUX(25, RP2_PINCTRL_GPIO_FUNC_PIO1)
217+
#define PIO1_P26 RP2040_PINMUX(26, RP2_PINCTRL_GPIO_FUNC_PIO1)
218+
#define PIO1_P27 RP2040_PINMUX(27, RP2_PINCTRL_GPIO_FUNC_PIO1)
219+
#define PIO1_P28 RP2040_PINMUX(28, RP2_PINCTRL_GPIO_FUNC_PIO1)
220+
#define PIO1_P29 RP2040_PINMUX(29, RP2_PINCTRL_GPIO_FUNC_PIO1)
221+
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#endif /* __RP2040_PINCTRL_H__ */

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