66ccc2e241
Add watchdog driver for npm2100 pmic. This pmic has one timer that can be used for multiple functions, including a watchdog that can reset or power-cycle connected devices. Signed-off-by: Audun Korneliussen <audun.korneliussen@nordicsemi.no>
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*
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* Copyright (c) 2024 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_npm2100_wdt
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#include <errno.h>
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/watchdog.h>
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#include <zephyr/drivers/mfd/npm2100.h>
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#define TIMER_TASKS_START 0xB0U
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#define TIMER_TASKS_STOP 0xB1U
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#define TIMER_TASKS_KICK 0xB2U
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#define TIMER_CONFIG 0xB3U
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#define TIMER_TARGET_HI 0xB4U
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#define TIMER_TARGET_MID 0xB5U
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#define TIMER_TARGET_LO 0xB6U
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#define TIMER_STATUS 0xB7U
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#define TIMER_BOOT_MON 0xB8U
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struct wdt_npm2100_config {
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const struct device *mfd;
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struct i2c_dt_spec i2c;
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};
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struct wdt_npm2100_data {
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bool timeout_valid;
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};
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static int wdt_npm2100_setup(const struct device *dev, uint8_t options)
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{
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const struct wdt_npm2100_config *config = dev->config;
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struct wdt_npm2100_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_npm2100_start_timer(config->mfd);
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}
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static int wdt_npm2100_disable(const struct device *dev)
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{
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const struct wdt_npm2100_config *config = dev->config;
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struct wdt_npm2100_data *data = dev->data;
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int ret;
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ret = i2c_reg_write_byte_dt(&config->i2c, TIMER_TASKS_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_npm2100_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_npm2100_config *config = dev->config;
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struct wdt_npm2100_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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switch (timeout->flags & WDT_FLAG_RESET_MASK) {
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case WDT_FLAG_RESET_NONE:
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/* Watchdog expiry causes event only, and does not reset */
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mode = NPM2100_TIMER_MODE_GENERAL_PURPOSE;
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break;
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case WDT_FLAG_RESET_CPU_CORE:
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/* Watchdog expiry asserts reset output */
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mode = NPM2100_TIMER_MODE_WDT_RESET;
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break;
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case WDT_FLAG_RESET_SOC:
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/* Watchdog expiry causes full power cycle */
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mode = NPM2100_TIMER_MODE_WDT_POWER_CYCLE;
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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_npm2100_set_timer(config->mfd, timeout->window.max, 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_npm2100_feed(const struct device *dev, int channel_id)
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{
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const struct wdt_npm2100_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 i2c_reg_write_byte_dt(&config->i2c, TIMER_TASKS_KICK, 1U);
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}
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static DEVICE_API(wdt, wdt_npm2100_api) = {
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.setup = wdt_npm2100_setup,
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.disable = wdt_npm2100_disable,
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.install_timeout = wdt_npm2100_install_timeout,
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.feed = wdt_npm2100_feed,
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};
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static int wdt_npm2100_init(const struct device *dev)
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{
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const struct wdt_npm2100_config *config = dev->config;
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if (!i2c_is_ready_dt(&config->i2c)) {
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return -ENODEV;
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}
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/* Disable boot monitor */
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return wdt_npm2100_disable(dev);
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}
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#define WDT_NPM2100_DEFINE(n) \
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static struct wdt_npm2100_data data##n; \
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\
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static const struct wdt_npm2100_config config##n = { \
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.mfd = DEVICE_DT_GET(DT_INST_PARENT(n)), \
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.i2c = I2C_DT_SPEC_GET(DT_INST_PARENT(n)), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, &wdt_npm2100_init, NULL, &data##n, &config##n, POST_KERNEL, \
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CONFIG_WDT_NPM2100_INIT_PRIORITY, &wdt_npm2100_api);
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DT_INST_FOREACH_STATUS_OKAY(WDT_NPM2100_DEFINE)
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