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/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024/03/02 ShichengChu first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "drv_wdt.h"
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "DRV.WDT"
#define WDT_FREQ_DEFAULT 25000000UL
#define CVI_WDT_MAX_TOP 15
struct _cvi_wdt_dev
{
struct rt_watchdog_device device;
const char *name;
rt_uint32_t base;
};
static struct _cvi_wdt_dev _wdt_dev[] =
{
#ifdef BSP_USING_WDT0
{
.name = "wdt0",
.base = CVI_WDT0_BASE
},
#endif /* BSP_USING_WDT0 */
#ifdef BSP_USING_WDT1
{
.name = "wdt1",
.base = CVI_WDT1_BASE
},
#endif /* BSP_USING_WDT1 */
#ifdef BSP_USING_WDT2
{
.name = "wdt2",
.base = CVI_WDT2_BASE
},
#endif /* BSP_USING_WDT2 */
};
struct rt_watchdog_device wdt_device;
static rt_err_t _wdt_init(rt_watchdog_t *wdt_device)
{
cvi_wdt_top_setting();
return RT_EOK;
}
rt_inline int wdt_top_in_ms(unsigned int top)
{
/*
* There are 16 possible timeout values in 0..15 where the number of
* cycles is 2 ^ (16 + i) and the watchdog counts down.
*/
// pr_debug("wdt top in seconds: %d/%d=%d\n", (1U << (16 + top)), chip->clk_hz, (1U << (16 + top)) / chip->clk_hz);
return (1U << (16 + top)) / (WDT_FREQ_DEFAULT / 1000);
}
static rt_err_t csi_wdt_set_timeout(unsigned long reg_base, uint32_t ms)
{
rt_err_t ret = RT_EOK;
int i, top_val = CVI_WDT_MAX_TOP;
/*
* Iterate over the timeout values until we find the closest match. We
* always look for >=.
*/
for (i = 0; i <= CVI_WDT_MAX_TOP; ++i)
if (wdt_top_in_ms(i) >= ms) {
top_val = i;
break;
}
if (i < CVI_WDT_MAX_TOP)
{
/*
* Set the new value in the watchdog. Some versions of wdt_chip
* have TOPINIT in the TIMEOUT_RANGE register (as per
* CP_WDT_DUAL_TOP in WDT_COMP_PARAMS_1). On those we
* effectively get a pat of the watchdog right here.
*/
cvi_wdt_set_timeout(reg_base, top_val);
cvi_wdt_start_en(reg_base);
}
else
{
ret = -RT_ERROR;
}
return ret;
}
static rt_err_t _wdt_control(rt_watchdog_t *wdt_device, int cmd, void *arg)
{
RT_ASSERT(wdt_device != RT_NULL);
struct _cvi_wdt_dev *wdt = rt_container_of(wdt_device, struct _cvi_wdt_dev, device);
rt_uint32_t reg_base = wdt->base;
switch (cmd)
{
case RT_DEVICE_CTRL_WDT_KEEPALIVE:
cvi_wdt_feed_en(reg_base);
break;
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
csi_wdt_set_timeout(reg_base, *(rt_uint32_t *)arg);
wdt_device->parent.user_data = (rt_uint32_t)(*(rt_uint32_t *)arg);
break;
case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
*(rt_uint32_t *)arg = (rt_uint32_t)wdt_device->parent.user_data;
break;
case RT_DEVICE_CTRL_WDT_GET_TIMELEFT:
*(rt_uint32_t *)arg = (cvi_wdt_get_counter_value(reg_base) / (WDT_FREQ_DEFAULT / 1000U));
break;
case RT_DEVICE_CTRL_WDT_START:
cvi_wdt_set_respond_system_reset(reg_base);
cvi_wdt_start_en(reg_base);
break;
case RT_DEVICE_CTRL_WDT_STOP:
cvi_wdt_start_dis(reg_base);
break;
default:
LOG_W("This command is not supported.");
return -RT_EINVAL;
}
return RT_EOK;
}
static const struct rt_watchdog_ops _wdt_ops =
{
.init = _wdt_init,
.control = _wdt_control
};
int rt_hw_wdt_init(void)
{
rt_uint8_t i;
for (i = 0; i < sizeof(_wdt_dev) / sizeof(_wdt_dev[0]); i ++)
{
_wdt_dev[i].device.ops = &_wdt_ops;
if (rt_hw_watchdog_register(&_wdt_dev[i].device, _wdt_dev[i].name, RT_DEVICE_FLAG_RDWR, RT_NULL) != RT_EOK)
{
LOG_E("%s register failed!", _wdt_dev[i].name);
return -RT_ERROR;
}
}
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_wdt_init);
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