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zephyr/drivers/watchdog/wdt_dw.c

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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 <zephyr/drivers/reset.h>
#include <zephyr/drivers/clock_control.h>
#include "wdt_dw.h"
#include "wdt_dw_common.h"
LOG_MODULE_REGISTER(wdt_dw, CONFIG_WDT_LOG_LEVEL);
/* Device run time data */
struct dw_wdt_dev_data {
/* MMIO mapping information for watchdog register base address */
DEVICE_MMIO_RAM;
/* Clock frequency */
uint32_t clk_freq;
uint32_t config;
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
wdt_callback_t callback;
#endif
};
/* Device constant configuration parameters */
struct dw_wdt_dev_cfg {
DEVICE_MMIO_ROM;
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(clocks)
/* Clock controller dev instance */
const struct device *clk_dev;
/* Identifier for timer to get clock freq from clk manager */
clock_control_subsys_t clkid;
#endif
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
void (*irq_config)(void);
#endif
uint8_t reset_pulse_length;
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(resets)
/* Reset controller device configurations */
struct reset_dt_spec reset_spec;
#endif
};
static int dw_wdt_setup(const struct device *dev, uint8_t options)
{
struct dw_wdt_dev_data *const dev_data = dev->data;
uintptr_t reg_base = DEVICE_MMIO_GET(dev);
int ret;
ret = dw_wdt_check_options(options);
if (ret != 0) {
return ret;
}
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
/* Configure response mode */
dw_wdt_response_mode_set((uint32_t)reg_base, !!dev_data->callback);
#endif
return dw_wdt_configure((uint32_t)reg_base, dev_data->config);
}
static int dw_wdt_install_timeout(const struct device *dev, const struct wdt_timeout_cfg *config)
{
__maybe_unused const struct dw_wdt_dev_cfg *const dev_config = dev->config;
struct dw_wdt_dev_data *const dev_data = dev->data;
uintptr_t reg_base = DEVICE_MMIO_GET(dev);
if (config == NULL) {
LOG_ERR("watchdog timeout configuration missing");
return -ENODATA;
}
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
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_WRN("Watchdog behavior is not configurable.");
}
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
dev_data->callback = config->callback;
#endif
return dw_wdt_calc_period((uint32_t)reg_base, dev_data->clk_freq, config,
&dev_data->config);
}
static int dw_wdt_feed(const struct device *dev, int channel_id)
{
uintptr_t reg_base = DEVICE_MMIO_GET(dev);
/* Only channel 0 is supported */
if (channel_id) {
return -EINVAL;
}
dw_wdt_counter_restart((uint32_t)reg_base);
return 0;
}
int dw_wdt_disable(const struct device *dev)
{
int ret = -ENOTSUP;
/*
* Once watchdog is enabled by setting WDT_EN bit watchdog cannot be disabled by clearing
* WDT_EN bit and to disable/clear WDT_EN bit watchdog IP should undergo reset
*/
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(resets)
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
/*
* Assert and de-assert reset only if the reset prop is defined in the device
* tree node for this dev instance
*/
if (dev_config->reset_spec.dev != NULL) {
if (!device_is_ready(dev_config->reset_spec.dev)) {
LOG_ERR("reset controller device not ready");
return -ENODEV;
}
/* Assert and de-assert reset watchdog */
ret = reset_line_toggle(dev_config->reset_spec.dev, dev_config->reset_spec.id);
if (ret != 0) {
LOG_ERR("watchdog disable/reset failed");
return ret;
}
}
#endif
return ret;
}
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)
{
DEVICE_MMIO_MAP(dev, K_MEM_CACHE_NONE);
const struct dw_wdt_dev_cfg *const dev_config = dev->config;
int ret;
uintptr_t reg_base = DEVICE_MMIO_GET(dev);
/* Reset watchdog controller if reset controller is supported */
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(resets)
ret = dw_wdt_disable(dev);
if (ret != 0) {
return ret;
}
#endif
/* Get clock frequency from the clock manager if supported */
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(clocks)
struct dw_wdt_dev_data *const dev_data = dev->data;
if (!device_is_ready(dev_config->clk_dev)) {
LOG_ERR("Clock controller device not ready");
return -ENODEV;
}
ret = clock_control_get_rate(dev_config->clk_dev, dev_config->clkid,
&dev_data->clk_freq);
if (ret != 0) {
LOG_ERR("Failed to get watchdog clock rate");
return ret;
}
#endif
ret = dw_wdt_probe((uint32_t)reg_base, dev_config->reset_pulse_length);
if (ret)
return ret;
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
if (dev_config->irq_config) {
dev_config->irq_config();
}
#endif
/*
* Enable watchdog if it needs to be enabled at boot.
* watchdog timer will be started with maximum timeout
* that is the default value.
*/
if (!IS_ENABLED(CONFIG_WDT_DISABLE_AT_BOOT)) {
dw_wdt_enable((uint32_t)reg_base);
}
return 0;
}
#if DT_ANY_INST_HAS_PROP_STATUS_OKAY(interrupts)
static void dw_wdt_isr(const struct device *dev)
{
struct dw_wdt_dev_data *const dev_data = dev->data;
uintptr_t reg_base = DEVICE_MMIO_GET(dev);
if (dw_wdt_interrupt_status_register_get((uint32_t)reg_base)) {
/*
* Clearing interrupt here will not assert system reset, so interrupt
* will not be cleared here.
*/
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
/* Bindings to the platform */
#define DW_WDT_IRQ_FLAGS(inst) \
COND_CODE_1(DT_INST_IRQ_HAS_CELL(inst, sense), (DT_INST_IRQ(inst, sense)), (0))
#define DW_WDT_RESET_SPEC_INIT(inst) \
.reset_spec = RESET_DT_SPEC_INST_GET(inst),
#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), DW_WDT_IRQ_FLAGS(inst)); \
irq_enable(DT_INST_IRQN(inst)); \
}
#define DW_WDT_INIT(inst) \
IF_ENABLED(DT_NODE_HAS_PROP(DT_DRV_INST(inst), interrupts), (IRQ_CONFIG(inst))) \
\
static const struct dw_wdt_dev_cfg wdt_dw##inst##_config = { \
DEVICE_MMIO_ROM_INIT(DT_DRV_INST(inst)), \
.reset_pulse_length = ilog2(DT_INST_PROP_OR(inst, reset_pulse_length, 2)) - 1, \
IF_ENABLED(DT_INST_NODE_HAS_PROP(inst, resets), \
(DW_WDT_RESET_SPEC_INIT(inst))) \
IF_ENABLED(DT_PHA_HAS_CELL(DT_DRV_INST(inst), clocks, clkid), \
( \
.clk_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(inst)), \
.clkid = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(inst, clkid), \
)) \
IF_ENABLED(DT_NODE_HAS_PROP(DT_DRV_INST(inst), interrupts), \
(.irq_config = dw_wdt##inst##_irq_config,) \
) \
}; \
\
static struct dw_wdt_dev_data wdt_dw##inst##_data = { \
COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, clock_frequency), \
(.clk_freq = DT_INST_PROP(inst, clock_frequency)), \
(COND_CODE_1(DT_PHA_HAS_CELL(DT_DRV_INST(inst), clocks, clkid), \
(.clk_freq = 0), \
(.clk_freq = DT_INST_PROP_BY_PHANDLE(inst, clocks, clock_frequency))))), \
}; \
\
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)
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