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wdt_mcux_wwdt.c
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wdt_mcux_wwdt.c
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/*
* Copyright (c) 2020, Jiri Kerestes
*
* Based on wdt_mcux_wdog32.c, which is:
* Copyright (c) 2019 Vestas Wind Systems A/S
* Copyright (c) 2018, NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_lpc_wwdt
#include <zephyr/drivers/watchdog.h>
#include <zephyr/irq.h>
#include <zephyr/sys_clock.h>
#include <fsl_wwdt.h>
#include <fsl_clock.h>
#define LOG_LEVEL CONFIG_WDT_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(wdt_mcux_wwdt);
#define MIN_TIMEOUT 0xFF
struct mcux_wwdt_config {
WWDT_Type *base;
uint8_t clk_divider;
void (*irq_config_func)(const struct device *dev);
};
struct mcux_wwdt_data {
wdt_callback_t callback;
wwdt_config_t wwdt_config;
bool timeout_valid;
};
static int mcux_wwdt_setup(const struct device *dev, uint8_t options)
{
const struct mcux_wwdt_config *config = dev->config;
struct mcux_wwdt_data *data = dev->data;
WWDT_Type *base = config->base;
if (!data->timeout_valid) {
LOG_ERR("No valid timeouts installed");
return -EINVAL;
}
WWDT_Init(base, &data->wwdt_config);
LOG_DBG("Setup the watchdog");
return 0;
}
static int mcux_wwdt_disable(const struct device *dev)
{
const struct mcux_wwdt_config *config = dev->config;
struct mcux_wwdt_data *data = dev->data;
WWDT_Type *base = config->base;
WWDT_Deinit(base);
data->timeout_valid = false;
LOG_DBG("Disabled the watchdog");
return 0;
}
/*
* LPC55xxx WWDT has a fixed divide-by-4 clock prescaler.
* This prescaler is different from the clock divider specified in Device Tree.
*/
#define MSEC_TO_WWDT_TICKS(clock_freq, msec) \
((uint32_t)((clock_freq / MSEC_PER_SEC) * msec) / 4)
static int mcux_wwdt_install_timeout(const struct device *dev,
const struct wdt_timeout_cfg *cfg)
{
struct mcux_wwdt_data *data = dev->data;
uint32_t clock_freq;
if (data->timeout_valid) {
LOG_ERR("No more timeouts can be installed");
return -ENOMEM;
}
#if defined(CONFIG_SOC_MIMXRT685S_CM33) || defined(CONFIG_SOC_MIMXRT595S_CM33) \
|| defined(CONFIG_SOC_SERIES_MCXNX4X)
clock_freq = CLOCK_GetWdtClkFreq(0);
#elif defined(CONFIG_SOC_SERIES_RW6XX)
clock_freq = CLOCK_GetWdtClkFreq();
#else
const struct mcux_wwdt_config *config = dev->config;
CLOCK_SetClkDiv(kCLOCK_DivWdtClk, config->clk_divider, true);
clock_freq = CLOCK_GetWdtClkFreq();
#endif
WWDT_GetDefaultConfig(&data->wwdt_config);
data->wwdt_config.clockFreq_Hz = clock_freq;
data->wwdt_config.timeoutValue =
MSEC_TO_WWDT_TICKS(clock_freq, cfg->window.max);
if (cfg->window.min) {
data->wwdt_config.windowValue =
MSEC_TO_WWDT_TICKS(clock_freq, cfg->window.min);
}
if ((data->wwdt_config.timeoutValue < MIN_TIMEOUT) ||
((data->wwdt_config.windowValue != 0xFFFFFFU) &&
(data->wwdt_config.timeoutValue <
data->wwdt_config.windowValue))) {
return -EINVAL;
}
if (cfg->flags & WDT_FLAG_RESET_SOC) {
data->wwdt_config.enableWatchdogReset = true;
LOG_DBG("Enabling SoC reset");
}
if (cfg->callback && (CONFIG_WDT_MCUX_WWDT_WARNING_INTERRUPT_CFG > 0)) {
data->callback = cfg->callback;
data->wwdt_config.warningValue = CONFIG_WDT_MCUX_WWDT_WARNING_INTERRUPT_CFG;
} else if (cfg->callback) {
return -ENOTSUP;
}
data->timeout_valid = true;
LOG_DBG("Installed timeout (timeoutValue = %d)",
data->wwdt_config.timeoutValue);
return 0;
}
static int mcux_wwdt_feed(const struct device *dev, int channel_id)
{
const struct mcux_wwdt_config *config = dev->config;
WWDT_Type *base = config->base;
if (channel_id != 0) {
LOG_ERR("Invalid channel id");
return -EINVAL;
}
WWDT_Refresh(base);
LOG_DBG("Fed the watchdog");
return 0;
}
static void mcux_wwdt_isr(const struct device *dev)
{
const struct mcux_wwdt_config *config = dev->config;
struct mcux_wwdt_data *data = dev->data;
WWDT_Type *base = config->base;
uint32_t flags;
flags = WWDT_GetStatusFlags(base);
WWDT_ClearStatusFlags(base, flags);
if (data->callback) {
data->callback(dev, 0);
}
}
static int mcux_wwdt_init(const struct device *dev)
{
const struct mcux_wwdt_config *config = dev->config;
config->irq_config_func(dev);
return 0;
}
static const struct wdt_driver_api mcux_wwdt_api = {
.setup = mcux_wwdt_setup,
.disable = mcux_wwdt_disable,
.install_timeout = mcux_wwdt_install_timeout,
.feed = mcux_wwdt_feed,
};
static void mcux_wwdt_config_func_0(const struct device *dev);
static const struct mcux_wwdt_config mcux_wwdt_config_0 = {
.base = (WWDT_Type *) DT_INST_REG_ADDR(0),
.clk_divider =
DT_INST_PROP(0, clk_divider),
.irq_config_func = mcux_wwdt_config_func_0,
};
static struct mcux_wwdt_data mcux_wwdt_data_0;
DEVICE_DT_INST_DEFINE(0, &mcux_wwdt_init,
NULL, &mcux_wwdt_data_0,
&mcux_wwdt_config_0, POST_KERNEL,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&mcux_wwdt_api);
static void mcux_wwdt_config_func_0(const struct device *dev)
{
IRQ_CONNECT(DT_INST_IRQN(0),
DT_INST_IRQ(0, priority),
mcux_wwdt_isr, DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQN(0));
}