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drivers: interrupt_controller: add a WCH EXTI external interrupt driver
Signed-off-by: Michael Hope <michaelh@juju.nz>
1 parent 81ee157 commit d060b89

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‎drivers/interrupt_controller/CMakeLists.txt

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@@ -45,6 +45,7 @@ zephyr_library_sources_ifdef(CONFIG_RENESAS_RZ_EXT_IRQ intc_renesas_rz_ext_
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zephyr_library_sources_ifdef(CONFIG_NXP_IRQSTEER intc_nxp_irqsteer.c)
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zephyr_library_sources_ifdef(CONFIG_INTC_MTK_ADSP intc_mtk_adsp.c)
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zephyr_library_sources_ifdef(CONFIG_WCH_PFIC intc_wch_pfic.c)
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zephyr_library_sources_ifdef(CONFIG_WCH_EXTI intc_wch_exti.c)
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if(CONFIG_INTEL_VTD_ICTL)
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zephyr_library_include_directories(${ZEPHYR_BASE}/arch/x86/include)

‎drivers/interrupt_controller/Kconfig

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@@ -110,4 +110,6 @@ source "drivers/interrupt_controller/Kconfig.mtk_adsp"
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source "drivers/interrupt_controller/Kconfig.wch_pfic"
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source "drivers/interrupt_controller/Kconfig.wch_exti"
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endmenu

‎drivers/interrupt_controller/Kconfig.wch_exti

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# Copyright (c) 2025 Michael Hope <michaelh@juju.nz>
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# SPDX-License-Identifier: Apache-2.0
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config WCH_EXTI
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bool "WCH CH32V003/20x/30x External Interrupt and Event Controller (EXTI)"
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default y
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depends on DT_HAS_WCH_EXTI_ENABLED
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help
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Enable the WCH CH32V003/20x/30x External Interrupt and Event Controller (EXTI)
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driver.

‎drivers/interrupt_controller/intc_wch_exti.c

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/*
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* Copyright (c) 2025 Michael Hope <michaelh@juju.nz>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT wch_exti
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#include <errno.h>
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#include <zephyr/device.h>
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#include <zephyr/irq.h>
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#include <zephyr/sys/util_macro.h>
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#include <zephyr/drivers/interrupt_controller/wch_exti.h>
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#include <ch32fun.h>
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#define WCH_EXTI_NUM_LINES DT_PROP(DT_NODELABEL(exti), num_lines)
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/* Per EXTI callback registration */
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struct wch_exti_registration {
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wch_exti_callback_handler_t callback;
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void *user;
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};
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struct wch_exti_data {
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struct wch_exti_registration callbacks[WCH_EXTI_NUM_LINES];
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};
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#define WCH_EXTI_INIT_RANGE(node_id, interrupts, idx) \
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DT_PROP_BY_IDX(node_id, line_ranges, UTIL_X2(idx)),
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/* [start, end) line ranges for each line group */
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static const uint8_t wch_exti_ranges[] = {
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DT_FOREACH_PROP_ELEM(DT_NODELABEL(exti), interrupt_names, WCH_EXTI_INIT_RANGE)
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WCH_EXTI_NUM_LINES,
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};
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#define WCH_EXTI_INIT_INTERRUPT(node_id, interrupts, idx) DT_IRQ_BY_IDX(node_id, idx, irq),
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/* Interrupt number for each line group. Used when enabling the interrupt. */
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const uint8_t wch_exti_interrupts[] = {
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DT_FOREACH_PROP_ELEM(DT_NODELABEL(exti), interrupt_names, WCH_EXTI_INIT_INTERRUPT)};
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BUILD_ASSERT(ARRAY_SIZE(wch_exti_interrupts) + 1 == ARRAY_SIZE(wch_exti_ranges));
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static void wch_exti_isr(const void *user)
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{
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const struct device *const dev = DEVICE_DT_INST_GET(0);
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struct wch_exti_data *data = dev->data;
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EXTI_TypeDef *regs = (EXTI_TypeDef *)DT_INST_REG_ADDR(0);
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const uint8_t *range = user;
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uint32_t intfr = regs->INTFR;
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for (uint8_t line = range[0]; line < range[1]; line++) {
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if ((intfr & BIT(line)) != 0) {
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const struct wch_exti_registration *callback = &data->callbacks[line];
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/* Clear the interrupt */
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regs->INTFR = BIT(line);
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if (callback->callback != NULL) {
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callback->callback(line, callback->user);
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}
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}
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}
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}
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void wch_exti_enable(uint8_t line)
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{
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EXTI_TypeDef *regs = (EXTI_TypeDef *)DT_INST_REG_ADDR(0);
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regs->INTENR |= BIT(line);
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/* Find the corresponding interrupt and enable it */
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for (uint8_t i = 1; i < ARRAY_SIZE(wch_exti_ranges); i++) {
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if (line < wch_exti_ranges[i]) {
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irq_enable(wch_exti_interrupts[i - 1]);
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break;
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}
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}
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}
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void wch_exti_disable(uint8_t line)
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{
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EXTI_TypeDef *regs = (EXTI_TypeDef *)DT_INST_REG_ADDR(0);
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regs->INTENR &= ~BIT(line);
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}
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int wch_exti_configure(uint8_t line, wch_exti_callback_handler_t callback, void *user)
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{
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const struct device *const dev = DEVICE_DT_INST_GET(0);
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struct wch_exti_data *data = dev->data;
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struct wch_exti_registration *registration = &data->callbacks[line];
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if (callback != NULL && registration->callback != NULL) {
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return -EALREADY;
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}
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registration->callback = callback;
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registration->user = user;
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return 0;
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}
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void wch_exti_set_trigger(uint8_t line, enum wch_exti_trigger trigger)
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{
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EXTI_TypeDef *regs = (EXTI_TypeDef *)DT_INST_REG_ADDR(0);
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WRITE_BIT(regs->RTENR, line, (trigger & WCH_EXTI_TRIGGER_RISING_EDGE) != 0);
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WRITE_BIT(regs->FTENR, line, (trigger & WCH_EXTI_TRIGGER_FALLING_EDGE) != 0);
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}
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#define WCH_EXTI_CONNECT_IRQ(node_id, interrupts, idx) \
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IRQ_CONNECT(DT_IRQ_BY_IDX(node_id, idx, irq), DT_IRQ_BY_IDX(node_id, idx, priority), \
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wch_exti_isr, &wch_exti_ranges[idx], 0);
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static int wch_exti_init(const struct device *dev)
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{
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DT_FOREACH_PROP_ELEM(DT_NODELABEL(exti), interrupt_names, WCH_EXTI_CONNECT_IRQ);
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return 0;
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}
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static struct wch_exti_data wch_exti_data_0;
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DEVICE_DT_INST_DEFINE(0, wch_exti_init, NULL, &wch_exti_data_0, NULL, PRE_KERNEL_2,
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CONFIG_INTC_INIT_PRIORITY, NULL);

‎dts/bindings/interrupt-controller/wch,exti.yaml

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# Copyright (c) 2025 Michael Hope
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# SPDX-License-Identifier: Apache-2.0
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description: WCH CH32V003/20x/30x External Interrupt and Event Controller (EXTI)
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compatible: "wch,exti"
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include: [base.yaml, interrupt-controller.yaml]
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properties:
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reg:
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required: true
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interrupts:
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required: true
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num-lines:
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type: int
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required: true
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description: Number of lines supported by the interrupt controller.
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line-ranges:
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type: array
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required: true
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description: |
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Description of the input lines range for each interrupt line supported
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by the external interrupt controller. For each line a couple of integers is
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provided: the number of the first line of the range start and the length
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of the range.
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As example:
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line-ranges = <0 1>, <1 1>, <2 1>, <3 1>,
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<4 1>, <5 5>, <10 6>;
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Above property provides event-range for 7 lines.
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5 first lines contain one element
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6th line starts with input line 5 and contains 5 elements (5 to 9)
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7th line starts with inupt line 10 and contains 6 elements (10 to 15)

‎dts/riscv/wch/ch32v0/ch32v003.dtsi

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status = "disabled";
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};
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exti: interrupt-controller@40010400 {
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compatible = "wch,exti";
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interrupt-controller;
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#interrupt-cells = <1>;
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reg = <0x40010400 16>;
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interrupt-parent = <&pfic>;
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num-lines = <8>;
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interrupts = <20>;
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line-ranges = <0 8>;
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interrupt-names = "line0-7";
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status = "disabled";
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};
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pinctrl: pin-controller@40010000 {
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compatible = "wch,afio";
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reg = <0x40010000 0x10>;

‎dts/riscv/wch/ch32v208/ch32v208.dtsi

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status = "disabled";
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};
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exti: interrupt-controller@40010400 {
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compatible = "wch,exti";
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interrupt-controller;
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#interrupt-cells = <1>;
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reg = <0x40010400 16>;
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interrupt-parent = <&pfic>;
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num-lines = <16>;
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line-ranges = <0 1>, <1 1>, <2 1>, <3 1>, <4 1>,
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<5 5>, <10 6>;
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interrupts = <22 23 24 25 26 39 56>;
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interrupt-names = "line0", "line1", "line2", "line3",
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"line4", "line5-9", "line10-15";
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status = "disabled";
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};
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pinctrl: pin-controller@40010000 {
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compatible = "wch,20x_30x-afio";
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reg = <0x40010000 16>;

‎include/zephyr/drivers/interrupt_controller/wch_exti.h

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/*
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* Copyright (c) 2025 Michael Hope <michaelh@juju.nz>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_DRIVERS_INTERRUPT_CONTROLLER_WCH_EXTI_H_
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#define ZEPHYR_INCLUDE_DRIVERS_INTERRUPT_CONTROLLER_WCH_EXTI_H_
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#include <stdint.h>
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#include <zephyr/sys/util_macro.h>
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/* Callback for EXTI interrupt. */
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typedef void (*wch_exti_callback_handler_t)(uint8_t line, void *user);
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enum wch_exti_trigger {
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/* Trigger on rising edge */
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WCH_EXTI_TRIGGER_RISING_EDGE = BIT(0),
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/* Trigger on falling edge */
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WCH_EXTI_TRIGGER_FALLING_EDGE = BIT(1),
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};
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/* Eanble the EXTI interrupt for `line` */
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void wch_exti_enable(uint8_t line);
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/* Disable the EXTI interrupt for `line` */
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void wch_exti_disable(uint8_t line);
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/* Set the trigger mode for `line` */
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void wch_exti_set_trigger(uint8_t line, enum wch_exti_trigger trigger);
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/* Register a callback for `line` */
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int wch_exti_configure(uint8_t line, wch_exti_callback_handler_t callback, void *user);
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#endif /* ZEPHYR_INCLUDE_DRIVERS_INTERRUPT_CONTROLLER_WCH_EXTI_H_ */

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