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/* SPDX-License-Identifier: Apache-2.0 */
/*
* Copyright (c) 2023 Intel Corporation
*
* Author: Adrian Warecki <adrian.warecki@intel.com>
*/
#include <zephyr/drivers/watchdog.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys_clock.h>
#include <zephyr/math/ilog2.h>
#include "wdt_dw_common.h"
#include "wdt_dw.h"
LOG_MODULE_REGISTER(wdt_dw_common, CONFIG_WDT_LOG_LEVEL);
#define WDT_DW_FLAG_CONFIGURED 0x80000000
int dw_wdt_check_options(const uint8_t options)
{
if (options & WDT_OPT_PAUSE_HALTED_BY_DBG) {
LOG_ERR("Pausing watchdog by debugger is not supported.");
return -ENOTSUP;
}
if (options & WDT_OPT_PAUSE_IN_SLEEP) {
LOG_ERR("Pausing watchdog in sleep is not supported.");
return -ENOTSUP;
}
return 0;
}
int dw_wdt_configure(const uint32_t base, const uint32_t config)
{
uint32_t period;
if (!(config & WDT_DW_FLAG_CONFIGURED)) {
LOG_ERR("Timeout not installed.");
return -ENOTSUP;
}
/* Configure timeout */
period = config & ~WDT_DW_FLAG_CONFIGURED;
if (dw_wdt_dual_timeout_period_get(base)) {
dw_wdt_timeout_period_init_set(base, period);
}
dw_wdt_timeout_period_set(base, period);
/* Enable watchdog */
dw_wdt_enable(base);
dw_wdt_counter_restart(base);
return 0;
}
int dw_wdt_calc_period(const uint32_t base, const uint32_t clk_freq,
const struct wdt_timeout_cfg *config, uint32_t *period_out)
{
uint64_t period64;
uint32_t period;
/* Window timeout is not supported by this driver */
if (config->window.min) {
LOG_ERR("Window timeout is not supported.");
return -ENOTSUP;
}
period64 = (uint64_t)clk_freq * config->window.max;
period64 /= 1000;
if (!period64 || (period64 >> 31)) {
LOG_ERR("Window max is out of range.");
return -EINVAL;
}
period = period64 - 1;
period = ilog2(period);
if (period >= dw_wdt_cnt_width_get(base)) {
LOG_ERR("Watchdog timeout too long.");
return -EINVAL;
}
/* The minimum counter value is 64k, maximum 2G */
*period_out = WDT_DW_FLAG_CONFIGURED | (period >= 15 ? period - 15 : 0);
return 0;
}
int dw_wdt_probe(const uint32_t base, const uint32_t reset_pulse_length)
{
/* Check component type */
const uint32_t type = dw_wdt_comp_type_get(base);
if (type != WDT_COMP_TYPE_VALUE) {
LOG_ERR("Invalid component type %x", type);
return -ENODEV;
}
dw_wdt_reset_pulse_length_set(base, reset_pulse_length);
return 0;
}
int dw_wdt_disable(const struct device *dev)
{
return -ENOTSUP;
}