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/* SPDX-License-Identifier: Apache-2.0 */
/*
* Copyright (c) 2023 Intel Corporation
*
* Author: Adrian Warecki <adrian.warecki@intel.com>
*/
#define DT_DRV_COMPAT snps_designware_watchdog
#include <zephyr/drivers/watchdog.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys_clock.h>
#include <zephyr/math/ilog2.h>
#include "wdt_dw.h"
#include "wdt_dw_common.h"
LOG_MODULE_REGISTER(wdt_dw, CONFIG_WDT_LOG_LEVEL);
#define WDT_IS_INST_IRQ_EN(inst) DT_NODE_HAS_PROP(DT_DRV_INST(inst), interrupts)
#define WDT_CHECK_INTERRUPT_USED(inst) WDT_IS_INST_IRQ_EN(inst) ||
#define WDT_DW_INTERRUPT_SUPPORT DT_INST_FOREACH_STATUS_OKAY(WDT_CHECK_INTERRUPT_USED) 0
/* Device run time data */
struct dw_wdt_dev_data {
uint32_t config;
#if WDT_DW_INTERRUPT_SUPPORT
wdt_callback_t callback;
#endif
};
/* Device constant configuration parameters */
struct dw_wdt_dev_cfg {
uint32_t base;
uint32_t clk_freq;
#if WDT_DW_INTERRUPT_SUPPORT
void (*irq_config)(void);
#endif
uint8_t reset_pulse_length;
};
static int dw_wdt_setup(const struct device *dev, uint8_t options)
{
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
struct dw_wdt_dev_data *const dev_data = dev->data;
dw_wdt_check_options(options);
#if WDT_DW_INTERRUPT_SUPPORT
/* Configure response mode */
dw_wdt_response_mode_set(dev_config->base, !!dev_data->callback);
#endif
return dw_wdt_configure(dev_config->base, dev_data->config);
}
static int dw_wdt_install_timeout(const struct device *dev, const struct wdt_timeout_cfg *config)
{
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
struct dw_wdt_dev_data *const dev_data = dev->data;
#if WDT_DW_INTERRUPT_SUPPORT
if (config->callback && !dev_config->irq_config) {
#else
if (config->callback) {
#endif
LOG_ERR("Interrupt is not configured, can't set a callback.");
return -ENOTSUP;
}
if (config->flags) {
LOG_ERR("Watchdog behavior is not configurable.");
return -ENOTSUP;
}
#ifdef WDT_DW_INTERRUPT_SUPPORT
dev_data->callback = config->callback;
#endif
return dw_wdt_calc_period(dev_config->base, dev_config->clk_freq, config,
&dev_data->config);
}
static int dw_wdt_feed(const struct device *dev, int channel_id)
{
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
/* Only channel 0 is supported */
if (channel_id) {
return -EINVAL;
}
dw_wdt_counter_restart(dev_config->base);
return 0;
}
static const struct wdt_driver_api dw_wdt_api = {
.setup = dw_wdt_setup,
.disable = dw_wdt_disable,
.install_timeout = dw_wdt_install_timeout,
.feed = dw_wdt_feed,
};
static int dw_wdt_init(const struct device *dev)
{
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
int ret;
ret = dw_wdt_probe(dev_config->base, dev_config->reset_pulse_length);
if (ret)
return ret;
#if WDT_DW_INTERRUPT_SUPPORT
if (dev_config->irq_config) {
dev_config->irq_config();
}
#endif
return 0;
}
#if WDT_DW_INTERRUPT_SUPPORT
static void dw_wdt_isr(const struct device *dev)
{
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
struct dw_wdt_dev_data *const dev_data = dev->data;
if (dw_wdt_interrupt_status_register_get(dev_config->base)) {
dw_wdt_clear_interrupt(dev_config->base);
if (dev_data->callback) {
dev_data->callback(dev, 0);
}
}
}
#endif
#define CHECK_CLOCK(inst) \
!(DT_INST_NODE_HAS_PROP(inst, clock_frequency) || DT_INST_NODE_HAS_PROP(inst, clocks)) ||
#if DT_INST_FOREACH_STATUS_OKAY(CHECK_CLOCK) 0
#error Clock frequency not configured!
#endif
#define IRQ_CONFIG(inst) \
static void dw_wdt##inst##_irq_config(void) \
{ \
IRQ_CONNECT(DT_INST_IRQN(inst), DT_INST_IRQ(inst, priority), dw_wdt_isr, \
DEVICE_DT_INST_GET(inst), DT_INST_IRQ(inst, sense)); \
irq_enable(DT_INST_IRQN(inst)); \
}
#define DW_WDT_INIT(inst) \
IF_ENABLED(WDT_IS_INST_IRQ_EN(inst), (IRQ_CONFIG(inst))) \
\
static const struct dw_wdt_dev_cfg wdt_dw##inst##_config = { \
.base = DT_INST_REG_ADDR(inst), \
COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, clock_frequency), \
(.clk_freq = DT_INST_PROP(inst, clock_frequency)), \
(.clk_freq = DT_INST_PROP_BY_PHANDLE(inst, clocks, clock_frequency)) \
), \
.reset_pulse_length = ilog2(DT_INST_PROP_OR(inst, reset_pulse_length, 2)) - 1, \
IF_ENABLED(WDT_IS_INST_IRQ_EN(inst), \
(.irq_config = dw_wdt##inst##_irq_config,) \
) \
}; \
\
static struct dw_wdt_dev_data wdt_dw##inst##_data; \
\
DEVICE_DT_INST_DEFINE(inst, &dw_wdt_init, NULL, &wdt_dw##inst##_data, \
&wdt_dw##inst##_config, POST_KERNEL, \
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &dw_wdt_api);
DT_INST_FOREACH_STATUS_OKAY(DW_WDT_INIT)