Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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/*
* Copyright (c) 2025 Espressif Systems (Shanghai) Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT espressif_esp32_lpgpio
#include <soc.h>
#include <errno.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/dt-bindings/gpio/espressif-esp32-gpio.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/util.h>
#include <zephyr/drivers/gpio/gpio_utils.h>
#include <hal/rtc_io_hal.h>
#include <soc/rtc_io_periph.h>
#include <ulp_lp_core_interrupts.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(gpio_esp32, CONFIG_LOG_DEFAULT_LEVEL);
struct gpio_esp32_lp_config {
struct gpio_driver_config drv_cfg;
lp_io_dev_t *const lp_io_dev;
};
struct gpio_esp32_lp_data {
struct gpio_driver_data common;
sys_slist_t cb;
};
void ulp_lp_core_lp_io_intr_handler(void)
{
uint32_t intr_status = rtcio_ll_get_interrupt_status();
const struct device *dev = DEVICE_DT_GET(DT_NODELABEL(lp_gpio));
struct gpio_esp32_lp_data *data = dev->data;
rtcio_ll_clear_interrupt_status();
gpio_fire_callbacks(&data->cb, dev, intr_status);
}
bool lp_gpio_is_valid(uint32_t pin)
{
return rtc_io_num_map[pin] >= 0;
}
static int gpio_esp32_lp_configure(const struct device *dev, gpio_pin_t pin, gpio_flags_t flags)
{
if (!lp_gpio_is_valid(pin)) {
LOG_ERR("Selected LP IO pin is not valid.");
return -EINVAL;
}
rtcio_hal_function_select(pin, RTCIO_FUNC_RTC);
if (flags & GPIO_OUTPUT) {
rtcio_hal_set_direction(pin, RTC_GPIO_MODE_OUTPUT_ONLY);
if (flags & GPIO_OUTPUT_INIT_HIGH) {
rtcio_hal_set_level(pin, 1);
} else if (flags & GPIO_OUTPUT_INIT_LOW) {
rtcio_hal_set_level(pin, 0);
}
} else if (flags & GPIO_INPUT) {
rtcio_hal_set_direction(pin, RTC_GPIO_MODE_INPUT_ONLY);
}
return 0;
}
static int gpio_esp32_lp_port_get_raw(const struct device *port, uint32_t *value)
{
const struct gpio_esp32_lp_config *const cfg = port->config;
*value = cfg->lp_io_dev->in.val;
return 0;
}
static int gpio_esp32_lp_port_set_masked_raw(const struct device *port, uint32_t mask,
uint32_t value)
{
const struct gpio_esp32_lp_config *const cfg = port->config;
cfg->lp_io_dev->out_data.val = (cfg->lp_io_dev->out_data.val & ~mask) | (mask & value);
return 0;
}
static int gpio_esp32_lp_port_set_bits_raw(const struct device *port, uint32_t pins)
{
const struct gpio_esp32_lp_config *const cfg = port->config;
cfg->lp_io_dev->out_data_w1ts.val = pins;
return 0;
}
static int gpio_esp32_lp_port_clear_bits_raw(const struct device *port, uint32_t pins)
{
const struct gpio_esp32_lp_config *const cfg = port->config;
cfg->lp_io_dev->out_data_w1tc.val = pins;
return 0;
}
static int gpio_esp32_lp_port_toggle_bits(const struct device *port, uint32_t pins)
{
const struct gpio_esp32_lp_config *const cfg = port->config;
cfg->lp_io_dev->out_data.val ^= pins;
return 0;
}
static int lp_gpio_convert_int_type(enum gpio_int_mode mode, enum gpio_int_trig trig)
{
if (mode == GPIO_INT_MODE_DISABLED) {
return RTCIO_INTR_DISABLE;
}
if (mode == GPIO_INT_MODE_LEVEL) {
switch (trig) {
case GPIO_INT_TRIG_LOW:
return RTCIO_INTR_LOW_LEVEL;
case GPIO_INT_TRIG_HIGH:
return RTCIO_INTR_HIGH_LEVEL;
default:
return -EINVAL;
}
} else { /* edge interrupts */
switch (trig) {
case GPIO_INT_TRIG_HIGH:
return RTCIO_INTR_POSEDGE;
case GPIO_INT_TRIG_LOW:
return RTCIO_INTR_NEGEDGE;
case GPIO_INT_TRIG_BOTH:
return RTCIO_INTR_ANYEDGE;
default:
return -EINVAL;
}
}
/* Any other type of interrupt triggering is invalid. */
return -EINVAL;
}
static int gpio_esp32_lp_pin_interrupt_configure(const struct device *dev, gpio_pin_t pin,
enum gpio_int_mode mode, enum gpio_int_trig trig)
{
int intr_trig_mode = lp_gpio_convert_int_type(mode, trig);
if (!lp_gpio_is_valid(pin)) {
LOG_ERR("Selected LP IO pin is not valid.");
return -EINVAL;
}
rtcio_ll_clear_interrupt_status();
ulp_lp_core_intr_enable();
rtcio_ll_intr_enable(pin, intr_trig_mode);
return 0;
}
static int gpio_esp32_lp_manage_callback(const struct device *dev, struct gpio_callback *callback,
bool set)
{
struct gpio_esp32_lp_data *data = dev->data;
return gpio_manage_callback(&data->cb, callback, set);
}
static uint32_t gpio_esp32_lp_get_pending_int(const struct device *dev)
{
ARG_UNUSED(dev);
return rtcio_ll_get_interrupt_status();
}
static int gpio_esp32_lp_init(const struct device *dev)
{
return 0;
}
static DEVICE_API(gpio, gpio_esp32_lp_driver_api) = {
.pin_configure = gpio_esp32_lp_configure,
.port_get_raw = gpio_esp32_lp_port_get_raw,
.port_set_masked_raw = gpio_esp32_lp_port_set_masked_raw,
.port_set_bits_raw = gpio_esp32_lp_port_set_bits_raw,
.port_clear_bits_raw = gpio_esp32_lp_port_clear_bits_raw,
.port_toggle_bits = gpio_esp32_lp_port_toggle_bits,
.pin_interrupt_configure = gpio_esp32_lp_pin_interrupt_configure,
.manage_callback = gpio_esp32_lp_manage_callback,
.get_pending_int = gpio_esp32_lp_get_pending_int
};
static struct gpio_esp32_lp_data gpio_esp32_lp_data_0;
static struct gpio_esp32_lp_config gpio_esp32_lp_cfg = {
.drv_cfg = {
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_NODE(DT_NODELABEL(lp_gpio)),
},
.lp_io_dev = (lp_io_dev_t *)DT_REG_ADDR(DT_NODELABEL(lp_gpio)),
};
DEVICE_DT_DEFINE(DT_NODELABEL(lp_gpio), gpio_esp32_lp_init, NULL, &gpio_esp32_lp_data_0,
&gpio_esp32_lp_cfg, PRE_KERNEL_1, CONFIG_GPIO_INIT_PRIORITY,
&gpio_esp32_lp_driver_api);