blob: 26a20c00968ce12cc6b743d647c60d8379807aaf [file] [log] [blame]
/*
* Copyright (c) 2024 ENE Technology Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT ene_kb1200_watchdog
#include <zephyr/irq.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/watchdog.h>
#include <errno.h>
#include <reg/wdt.h>
/* Device config */
struct wdt_kb1200_config {
struct wdt_regs *wdt;
};
/* Device data */
struct wdt_kb1200_data {
wdt_callback_t cb;
bool timeout_installed;
};
/* WDT api functions */
static int wdt_kb1200_setup(const struct device *dev, uint8_t options)
{
struct wdt_kb1200_config const *cfg = dev->config;
struct wdt_kb1200_data *data = dev->data;
if (!data->timeout_installed) {
printk("No valid WDT timeout installed");
return -EINVAL;
}
if (options & WDT_OPT_PAUSE_HALTED_BY_DBG) {
printk("WDT_OPT_PAUSE_HALTED_BY_DBG is not supported");
return -ENOTSUP;
}
/* Setting Clock Source */
if (options & WDT_OPT_PAUSE_IN_SLEEP) {
cfg->wdt->WDTCFG = WDT_ADCO32K;
} else {
cfg->wdt->WDTCFG = WDT_PHER32K;
}
/* Clear Pending Flag */
cfg->wdt->WDTPF = (WDT_HALF_WAY_EVENT | WDT_RESET_EVENT);
/* WDT enable */
cfg->wdt->WDTCFG |= WDT_FUNCTON_ENABLE;
return 0;
}
static int wdt_kb1200_disable(const struct device *dev)
{
struct wdt_kb1200_config const *cfg = dev->config;
struct wdt_kb1200_data *data = dev->data;
if (!(cfg->wdt->WDTCFG & WDT_FUNCTON_ENABLE)) {
return -EALREADY;
}
/* WDT disable, write bit 7~4 = 1001b */
cfg->wdt->WDTCFG = (cfg->wdt->WDTCFG & ~WDT_FUNCTON_ENABLE) | WDT_DISABLE_PASSWORD;
/* Clear Pending Flag */
cfg->wdt->WDTPF = (WDT_HALF_WAY_EVENT | WDT_RESET_EVENT);
/* Need disable IE,or the wdt-half-event interrupt will be entered */
cfg->wdt->WDTIE &= ~WDT_HALF_WAY_EVENT;
data->timeout_installed = false;
return 0;
}
static int wdt_kb1200_install_timeout(const struct device *dev,
const struct wdt_timeout_cfg *config)
{
struct wdt_kb1200_config const *cfg = dev->config;
struct wdt_kb1200_data *data = dev->data;
/* Watchdog Counter Match Value */
if (config->window.min > 0U) {
data->timeout_installed = false;
return -EINVAL;
}
cfg->wdt->WDTM = (config->window.max * 1000) / WDT_TICK_TIME_US;
/* (HW design) The counter match value must be >= 3 */
if (cfg->wdt->WDTM < WDT_MIN_CNT) {
data->timeout_installed = false;
return -EINVAL;
}
/* Watchdog behavior flags */
if ((config->flags & WDT_FLAG_RESET_MASK) == WDT_FLAG_RESET_SOC) {
/* Reset: SoC */
cfg->wdt->WDTCFG_T = WDT_RESET_WHOLE_CHIP_WO_GPIO;
} else if ((config->flags & WDT_FLAG_RESET_MASK) == WDT_FLAG_RESET_CPU_CORE) {
/* Reset: CPU core */
cfg->wdt->WDTCFG_T = WDT_RESET_WHOLE_CHIP;
} else {
/* Reset: none */
cfg->wdt->WDTCFG_T = WDT_RESET_ONLY_MCU;
}
/* Watchdog callback function */
data->cb = config->callback;
if (data->cb) {
cfg->wdt->WDTIE |= WDT_HALF_WAY_EVENT;
} else {
/* If the callback function is NULL,the SoC will be reset directly.
* But still need enable interrupt.
*/
cfg->wdt->WDTIE |= WDT_HALF_WAY_EVENT;
}
data->timeout_installed = true;
return 0;
}
static int wdt_kb1200_feed(const struct device *dev, int channel_id)
{
struct wdt_kb1200_config const *cfg = dev->config;
ARG_UNUSED(dev);
ARG_UNUSED(channel_id);
if (!(cfg->wdt->WDTCFG & WDT_FUNCTON_ENABLE)) {
return -EINVAL;
}
/* Re-enable to reset counter */
cfg->wdt->WDTCFG |= WDT_FUNCTON_ENABLE;
/* Clear Pending Flag */
cfg->wdt->WDTPF = WDT_HALF_WAY_EVENT;
return 0;
}
static void wdt_kb1200_isr(const struct device *dev)
{
struct wdt_kb1200_data *data = dev->data;
if (data->cb) {
data->cb(dev, 0);
}
}
static const struct wdt_driver_api wdt_kb1200_api = {
.setup = wdt_kb1200_setup,
.disable = wdt_kb1200_disable,
.install_timeout = wdt_kb1200_install_timeout,
.feed = wdt_kb1200_feed,
};
static int wdt_kb1200_init(const struct device *dev)
{
if (IS_ENABLED(CONFIG_WDT_DISABLE_AT_BOOT)) {
wdt_kb1200_disable(dev);
}
IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), wdt_kb1200_isr,
DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQN(0));
return 0;
}
static const struct wdt_kb1200_config wdt_kb1200_config = {
.wdt = (struct wdt_regs *)DT_INST_REG_ADDR(0),
};
static struct wdt_kb1200_data wdt_kb1200_dev_data;
DEVICE_DT_INST_DEFINE(0, wdt_kb1200_init, NULL, &wdt_kb1200_dev_data, &wdt_kb1200_config,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &wdt_kb1200_api);