273 lines
6.4 KiB
C
273 lines
6.4 KiB
C
/*
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* Copyright (c) 2016 Open-RnD Sp. z o.o.
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* Copyright (c) 2017 RnDity Sp. z o.o.
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* Copyright (c) 2019-23 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @brief Driver for External interrupt/event controller in STM32 MCUs
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*/
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#define EXTI_NODE DT_INST(0, st_stm32_exti)
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#include <zephyr/device.h>
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#include <soc.h>
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#include <stm32_ll_exti.h>
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#include <zephyr/sys/__assert.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/drivers/interrupt_controller/exti_stm32.h>
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#include <zephyr/irq.h>
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#include "stm32_hsem.h"
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/** @brief EXTI line ranges hold by a single ISR */
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struct stm32_exti_range {
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/** Start of the range */
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uint8_t start;
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/** Range length */
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uint8_t len;
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};
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#define NUM_EXTI_LINES DT_PROP(DT_NODELABEL(exti), num_lines)
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static IRQn_Type exti_irq_table[NUM_EXTI_LINES] = {[0 ... NUM_EXTI_LINES - 1] = 0xFF};
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/* wrapper for user callback */
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struct __exti_cb {
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stm32_exti_callback_t cb;
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void *data;
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};
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/* driver data */
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struct stm32_exti_data {
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/* per-line callbacks */
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struct __exti_cb cb[NUM_EXTI_LINES];
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};
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void stm32_exti_enable(int line)
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{
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int irqnum = 0;
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if (line >= NUM_EXTI_LINES) {
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__ASSERT_NO_MSG(line);
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}
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/* Get matching exti irq provided line thanks to irq_table */
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irqnum = exti_irq_table[line];
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if (irqnum == 0xFF) {
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__ASSERT_NO_MSG(line);
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}
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/* Enable requested line interrupt */
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#if defined(CONFIG_SOC_SERIES_STM32H7X) && defined(CONFIG_CPU_CORTEX_M4)
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LL_C2_EXTI_EnableIT_0_31(BIT((uint32_t)line));
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#else
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LL_EXTI_EnableIT_0_31(BIT((uint32_t)line));
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#endif
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/* Enable exti irq interrupt */
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irq_enable(irqnum);
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}
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void stm32_exti_disable(int line)
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{
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if (line < 32) {
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#if defined(CONFIG_SOC_SERIES_STM32H7X) && defined(CONFIG_CPU_CORTEX_M4)
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LL_C2_EXTI_DisableIT_0_31(BIT((uint32_t)line));
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#else
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LL_EXTI_DisableIT_0_31(BIT((uint32_t)line));
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#endif
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} else {
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__ASSERT_NO_MSG(line);
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}
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}
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/**
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* @brief check if interrupt is pending
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*
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* @param line line number
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*/
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static inline int stm32_exti_is_pending(int line)
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{
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if (line < 32) {
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#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32g0_exti)
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return (LL_EXTI_IsActiveRisingFlag_0_31(BIT((uint32_t)line)) ||
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LL_EXTI_IsActiveFallingFlag_0_31(BIT((uint32_t)line)));
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#elif defined(CONFIG_SOC_SERIES_STM32H7X) && defined(CONFIG_CPU_CORTEX_M4)
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return LL_C2_EXTI_IsActiveFlag_0_31(BIT((uint32_t)line));
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#else
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return LL_EXTI_IsActiveFlag_0_31(BIT((uint32_t)line));
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#endif
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} else {
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__ASSERT_NO_MSG(line);
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return 0;
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}
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}
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/**
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* @brief clear pending interrupt bit
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*
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* @param line line number
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*/
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static inline void stm32_exti_clear_pending(int line)
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{
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if (line < 32) {
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#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32g0_exti)
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LL_EXTI_ClearRisingFlag_0_31(BIT((uint32_t)line));
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LL_EXTI_ClearFallingFlag_0_31(BIT((uint32_t)line));
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#elif defined(CONFIG_SOC_SERIES_STM32H7X) && defined(CONFIG_CPU_CORTEX_M4)
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LL_C2_EXTI_ClearFlag_0_31(BIT((uint32_t)line));
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#else
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LL_EXTI_ClearFlag_0_31(BIT((uint32_t)line));
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#endif
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} else {
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__ASSERT_NO_MSG(line);
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}
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}
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void stm32_exti_trigger(int line, int trigger)
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{
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if (line >= 32) {
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__ASSERT_NO_MSG(line);
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}
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z_stm32_hsem_lock(CFG_HW_EXTI_SEMID, HSEM_LOCK_DEFAULT_RETRY);
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switch (trigger) {
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case STM32_EXTI_TRIG_NONE:
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LL_EXTI_DisableRisingTrig_0_31(BIT((uint32_t)line));
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LL_EXTI_DisableFallingTrig_0_31(BIT((uint32_t)line));
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break;
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case STM32_EXTI_TRIG_RISING:
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LL_EXTI_EnableRisingTrig_0_31(BIT((uint32_t)line));
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LL_EXTI_DisableFallingTrig_0_31(BIT((uint32_t)line));
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break;
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case STM32_EXTI_TRIG_FALLING:
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LL_EXTI_EnableFallingTrig_0_31(BIT((uint32_t)line));
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LL_EXTI_DisableRisingTrig_0_31(BIT((uint32_t)line));
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break;
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case STM32_EXTI_TRIG_BOTH:
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LL_EXTI_EnableRisingTrig_0_31(BIT((uint32_t)line));
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LL_EXTI_EnableFallingTrig_0_31(BIT((uint32_t)line));
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break;
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default:
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__ASSERT_NO_MSG(trigger);
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break;
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}
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z_stm32_hsem_unlock(CFG_HW_EXTI_SEMID);
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}
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/**
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* @brief EXTI ISR handler
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*
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* Check EXTI lines in exti_range for pending interrupts
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*
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* @param exti_range Pointer to a exti_range structure
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*/
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static void stm32_exti_isr(const void *exti_range)
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{
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const struct device *dev = DEVICE_DT_GET(EXTI_NODE);
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struct stm32_exti_data *data = dev->data;
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const struct stm32_exti_range *range = exti_range;
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int line;
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/* see which bits are set */
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for (uint8_t i = 0; i <= range->len; i++) {
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line = range->start + i;
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/* check if interrupt is pending */
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if (stm32_exti_is_pending(line) != 0) {
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/* clear pending interrupt */
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stm32_exti_clear_pending(line);
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/* run callback only if one is registered */
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if (!data->cb[line].cb) {
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continue;
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}
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data->cb[line].cb(line, data->cb[line].data);
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}
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}
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}
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static void stm32_fill_irq_table(int8_t start, int8_t len, int32_t irqn)
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{
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for (int i = 0; i < len; i++) {
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exti_irq_table[start + i] = irqn;
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}
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}
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/* This macro:
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* - populates line_range_x from line_range dt property
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* - fill exti_irq_table through stm32_fill_irq_table()
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* - calls IRQ_CONNECT for each irq & matching line_range
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*/
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#define STM32_EXTI_INIT(node_id, interrupts, idx) \
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static const struct stm32_exti_range line_range_##idx = { \
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DT_PROP_BY_IDX(node_id, line_ranges, UTIL_X2(idx)), \
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DT_PROP_BY_IDX(node_id, line_ranges, UTIL_INC(UTIL_X2(idx))) \
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}; \
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stm32_fill_irq_table(line_range_##idx.start, \
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line_range_##idx.len, \
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DT_IRQ_BY_IDX(node_id, idx, irq)); \
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IRQ_CONNECT(DT_IRQ_BY_IDX(node_id, idx, irq), \
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DT_IRQ_BY_IDX(node_id, idx, priority), \
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stm32_exti_isr, &line_range_##idx, \
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0);
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/**
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* @brief initialize EXTI device driver
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*/
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static int stm32_exti_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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DT_FOREACH_PROP_ELEM(DT_NODELABEL(exti),
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interrupt_names,
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STM32_EXTI_INIT);
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return 0;
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}
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static struct stm32_exti_data exti_data;
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DEVICE_DT_DEFINE(EXTI_NODE, &stm32_exti_init,
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NULL,
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&exti_data, NULL,
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PRE_KERNEL_1, CONFIG_INTC_INIT_PRIORITY,
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NULL);
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/**
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* @brief set & unset for the interrupt callbacks
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*/
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int stm32_exti_set_callback(int line, stm32_exti_callback_t cb, void *arg)
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{
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const struct device *const dev = DEVICE_DT_GET(EXTI_NODE);
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struct stm32_exti_data *data = dev->data;
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if ((data->cb[line].cb == cb) && (data->cb[line].data == arg)) {
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return 0;
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}
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/* if callback already exists/maybe-running return busy */
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if (data->cb[line].cb != NULL) {
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return -EBUSY;
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}
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data->cb[line].cb = cb;
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data->cb[line].data = arg;
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return 0;
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}
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void stm32_exti_unset_callback(int line)
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{
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const struct device *const dev = DEVICE_DT_GET(EXTI_NODE);
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struct stm32_exti_data *data = dev->data;
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data->cb[line].cb = NULL;
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data->cb[line].data = NULL;
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}
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