169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
/*
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* Copyright (c) 2023 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nordic_npm1300_wdt
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#include <errno.h>
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/watchdog.h>
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#include <zephyr/drivers/mfd/npm1300.h>
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#include <zephyr/dt-bindings/gpio/nordic-npm1300-gpio.h>
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/* nPM1300 TIMER base address */
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#define TIME_BASE 0x07U
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/* nPM1300 timer register offsets */
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#define TIME_OFFSET_START 0x00U
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#define TIME_OFFSET_STOP 0x01U
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#define TIME_OFFSET_WDOG_KICK 0x04U
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#define TIME_OFFSET_MODE 0x05U
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/* nPM1300 timer modes */
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#define TIME_MODE_BOOT 0x00U
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#define TIME_MODE_WARN 0x01U
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#define TIME_MODE_RESET 0x02U
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#define TIME_MODE_GEN 0x03U
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struct wdt_npm1300_config {
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const struct device *mfd;
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struct gpio_dt_spec reset_gpios;
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};
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struct wdt_npm1300_data {
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bool timeout_valid;
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};
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static int wdt_npm1300_setup(const struct device *dev, uint8_t options)
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{
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const struct wdt_npm1300_config *config = dev->config;
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struct wdt_npm1300_data *data = dev->data;
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if (!data->timeout_valid) {
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return -EINVAL;
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}
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return mfd_npm1300_reg_write(config->mfd, TIME_BASE, TIME_OFFSET_START, 1U);
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}
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static int wdt_npm1300_disable(const struct device *dev)
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{
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const struct wdt_npm1300_config *config = dev->config;
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struct wdt_npm1300_data *data = dev->data;
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int ret;
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ret = mfd_npm1300_reg_write(config->mfd, TIME_BASE, TIME_OFFSET_STOP, 1U);
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if (ret < 0) {
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return ret;
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}
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data->timeout_valid = false;
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return 0;
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}
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static int wdt_npm1300_install_timeout(const struct device *dev,
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const struct wdt_timeout_cfg *timeout)
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{
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const struct wdt_npm1300_config *config = dev->config;
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struct wdt_npm1300_data *data = dev->data;
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uint8_t mode;
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int ret;
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if (data->timeout_valid) {
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return -ENOMEM;
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}
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if (timeout->window.min != 0U) {
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return -EINVAL;
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}
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ret = mfd_npm1300_set_timer(config->mfd, timeout->window.max);
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if (ret < 0) {
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return ret;
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}
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switch (timeout->flags & WDT_FLAG_RESET_MASK) {
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case WDT_FLAG_RESET_NONE:
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/* Watchdog expiry causes warn event only, and does not reset */
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mode = TIME_MODE_GEN;
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break;
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case WDT_FLAG_RESET_CPU_CORE:
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/* Watchdog expiry causes warn event, then asserts reset output */
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mode = TIME_MODE_WARN;
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break;
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case WDT_FLAG_RESET_SOC:
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/* Watchdog expiry causes warn event, then full power cycle */
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mode = TIME_MODE_RESET;
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break;
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default:
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return -EINVAL;
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}
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ret = mfd_npm1300_reg_write(config->mfd, TIME_BASE, TIME_OFFSET_MODE, mode);
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if (ret < 0) {
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return ret;
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}
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data->timeout_valid = true;
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return 0;
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}
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static int wdt_npm1300_feed(const struct device *dev, int channel_id)
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{
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const struct wdt_npm1300_config *config = dev->config;
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if (channel_id != 0) {
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return -EINVAL;
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}
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return mfd_npm1300_reg_write(config->mfd, TIME_BASE, TIME_OFFSET_WDOG_KICK, 1U);
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}
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static const struct wdt_driver_api wdt_npm1300_api = {
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.setup = wdt_npm1300_setup,
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.disable = wdt_npm1300_disable,
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.install_timeout = wdt_npm1300_install_timeout,
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.feed = wdt_npm1300_feed,
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};
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static int wdt_npm1300_init(const struct device *dev)
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{
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const struct wdt_npm1300_config *config = dev->config;
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int ret;
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if (!device_is_ready(config->mfd)) {
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return -ENODEV;
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}
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if (config->reset_gpios.port != NULL) {
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if (!gpio_is_ready_dt(&config->reset_gpios)) {
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return -ENODEV;
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}
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ret = gpio_pin_configure_dt(&config->reset_gpios, NPM1300_GPIO_WDT_RESET_ON);
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if (ret != 0) {
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return ret;
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}
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}
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return 0;
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}
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#define WDT_NPM1300_DEFINE(n) \
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static struct wdt_npm1300_data data##n; \
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\
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static const struct wdt_npm1300_config config##n = { \
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.mfd = DEVICE_DT_GET(DT_INST_PARENT(n)), \
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.reset_gpios = GPIO_DT_SPEC_INST_GET_OR(n, reset_gpios, {0}), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, &wdt_npm1300_init, NULL, &data##n, &config##n, POST_KERNEL, \
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CONFIG_WDT_NPM1300_INIT_PRIORITY, &wdt_npm1300_api);
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DT_INST_FOREACH_STATUS_OKAY(WDT_NPM1300_DEFINE)
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