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