rt-thread-official/bsp/nuvoton/libraries/m2354/rtt_port/drv_wdt.c

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/**************************************************************************//**
*
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-07-24 klcheng First version
*
******************************************************************************/
#include <rtconfig.h>
#if defined(BSP_USING_WDT)
#include <rthw.h>
#include <rtdevice.h>
#include <rtdbg.h>
#include "NuMicro.h"
/*-------------------------------------------------------------------------------*/
/* watchdog timer timeout look up table */
/*-------------------------------------------------------------------------------*/
/* clock = LIRC 32000Hz. */
/* */
/* working hz toutsel exp cycles timeout (s) */
/* 32000 0 4 16 0.0005 */
/* 1 6 64 0.0020 */
/* 2 8 256 0.0080 */
/* 3 10 1024 0.0320 */
/* 4 12 4096 0.1280 */
/* 5 14 16384 0.5120 */
/* 6 16 65536 2.0480 */
/* 7 18 262144 8.1920 */
/* 8 20 1048576 32.7680 */
/*-------------------------------------------------------------------------------*/
/* clock = LXT 32768Hz. */
/* */
/* working hz toutsel exp cycles timeout (s) */
/* 32768 0 4 16 0.0005 */
/* 1 6 64 0.0020 */
/* 2 8 256 0.0078 */
/* 3 10 1024 0.0313 */
/* 4 12 4096 0.1250 */
/* 5 14 16384 0.5000 */
/* 6 16 65536 2.0000 */
/* 7 18 262144 8.0000 */
/* 8 20 1048576 32.000 */
/*-------------------------------------------------------------------------------*/
/* clock = 96MHz HCLK divide 2048 = 93750 Hz. */
/* */
/* working hz toutsel exp cycles timeout (s) */
/* 46875 0 4 16 0.00034 */
/* 1 6 64 0.00137 */
/* 2 8 256 0.00546 */
/* 3 10 1024 0.02185 */
/* 4 12 4096 0.08738 */
/* 5 14 16384 0.34953 */
/* 6 16 65536 1.39810 */
/* 7 18 262144 5.59241 */
/* 8 20 1048576 22.3696 */
/*-------------------------------------------------------------------------------*/
/* Private define ---------------------------------------------------------------*/
/* Pick a suitable wdt timeout interval, it is a trade-off between the
consideration of timeout accuracy and the system performance. The MIN_CYCLES
parameter is a numerical value of the toutsel setting, and it must be set to
a correct one which matches to the literal meaning of MIN_TOUTSEL. */
#define MIN_TOUTSEL (WDT_TIMEOUT_2POW10)
#define MIN_CYCLES (1024)
/* Macros to convert the value between the timeout interval and the soft time iterations. */
#define ROUND_TO_INTEGER(value) ((int)(((value) * 10 + 5) / 10))
#define CONV_SEC_TO_IT(hz, secs) (ROUND_TO_INTEGER((float)((secs) * (hz)) / (float)(MIN_CYCLES)))
#define CONV_IT_TO_SEC(hz, iterations) (ROUND_TO_INTEGER((float)((iterations) * (MIN_CYCLES)) / (float)(hz)))
/* Private typedef --------------------------------------------------------------*/
struct soft_time_handle
{
int clock_hz;
int wanted_sec;
int report_sec;
int left_iterations;
int full_iterations;
rt_bool_t expired;
rt_bool_t feed_dog;
};
typedef volatile struct soft_time_handle soft_time_handle_t;
/* Private functions ------------------------------------------------------------*/
static rt_err_t wdt_init(rt_watchdog_t *dev);
static rt_err_t wdt_control(rt_watchdog_t *dev, int cmd, void *args);
static uint32_t wdt_get_module_clock(void);
static uint32_t wdt_get_working_hz(void);
static void soft_time_init(soft_time_handle_t *const soft_time);
static void soft_time_setup(uint32_t wanted_sec, uint32_t hz, soft_time_handle_t *const soft_time);
static void soft_time_feed_dog(soft_time_handle_t *const soft_time);
#if defined(RT_USING_PM)
static int wdt_pm_suspend(const struct rt_device *device, rt_uint8_t mode);
static void wdt_pm_resume(const struct rt_device *device, rt_uint8_t mode);
static int wdt_pm_frequency_change(const struct rt_device *device, rt_uint8_t mode);
static void soft_time_freqeucy_change(uint32_t new_hz, soft_time_handle_t *const soft_time);
#endif
/* Public functions -------------------------------------------------------------*/
/* Private variables ------------------------------------------------------------*/
static struct soft_time_handle soft_time;
static struct rt_watchdog_device device_wdt;
static struct rt_watchdog_ops ops_wdt =
{
.init = wdt_init,
.control = wdt_control,
};
#if defined(RT_USING_PM)
static struct rt_device_pm_ops device_pm_ops =
{
.suspend = wdt_pm_suspend,
.resume = wdt_pm_resume,
.frequency_change = wdt_pm_frequency_change
};
#endif
#if defined(RT_USING_PM)
/* device pm suspend() entry. */
static int wdt_pm_suspend(const struct rt_device *device, rt_uint8_t mode)
{
switch (mode)
{
case PM_SLEEP_MODE_NONE:
case PM_SLEEP_MODE_IDLE:
case PM_SLEEP_MODE_STANDBY:
case PM_SLEEP_MODE_SHUTDOWN:
break;
case PM_SLEEP_MODE_LIGHT:
case PM_SLEEP_MODE_DEEP:
SYS_UnlockReg();
WDT->CTL &= ~WDT_CTL_WDTEN_Msk;
SYS_LockReg();
break;
default:
break;
}
return (int)RT_EOK;
}
/* device pm resume() entry. */
static void wdt_pm_resume(const struct rt_device *device, rt_uint8_t mode)
{
switch (mode)
{
case PM_SLEEP_MODE_NONE:
case PM_SLEEP_MODE_IDLE:
case PM_SLEEP_MODE_STANDBY:
case PM_SLEEP_MODE_SHUTDOWN:
break;
case PM_SLEEP_MODE_LIGHT:
case PM_SLEEP_MODE_DEEP:
SYS_UnlockReg();
WDT->CTL |= WDT_CTL_WDTEN_Msk;
SYS_LockReg();
break;
default:
break;
}
}
/* device pm frequency_change() entry. */
static int wdt_pm_frequency_change(const struct rt_device *device, rt_uint8_t mode)
{
uint32_t clk, new_hz;
new_hz = wdt_get_working_hz();
clk = wdt_get_module_clock();
if (clk == CLK_CLKSEL1_WDTSEL_HCLK_DIV2048)
{
if (new_hz == soft_time.clock_hz)
return (int)(RT_EOK);
/* frequency change occurs in critical section */
soft_time_freqeucy_change(new_hz, &soft_time);
}
return (int)(RT_EOK);
}
static void soft_time_freqeucy_change(uint32_t new_hz, soft_time_handle_t *const soft_time)
{
rt_base_t level;
soft_time_handle_t new_time;
rt_bool_t corner_case = RT_FALSE;
level = rt_hw_interrupt_disable();
new_time.clock_hz = new_hz;
new_time.feed_dog = soft_time->feed_dog;
new_time.expired = soft_time->expired;
new_time.wanted_sec = soft_time->wanted_sec;
new_time.full_iterations = CONV_SEC_TO_IT(new_hz, soft_time->wanted_sec);
new_time.report_sec = CONV_IT_TO_SEC(new_hz, new_time.full_iterations);
new_time.left_iterations = ROUND_TO_INTEGER((float)soft_time->left_iterations *
(float)new_hz / (float)soft_time->clock_hz);
if ((new_time.left_iterations == 0) && (soft_time->left_iterations > 0))
{
new_time.left_iterations++;;
corner_case = RT_TRUE;
}
*soft_time = new_time;
rt_hw_interrupt_enable(level);
if (corner_case)
{
LOG_W("pm frequency change cause wdt internal left iterations convert to 0.\n\r \
wdt driver will add another 1 iteration for this corner case.");
}
}
#endif
static void hw_wdt_init(void)
{
SYS_UnlockReg();
if (WDT_GET_RESET_FLAG())
{
LOG_W("System re-boots from watchdog timer reset.\n");
WDT_CLEAR_RESET_FLAG();
}
SYS_LockReg();
NVIC_EnableIRQ(WDT_IRQn);
}
/* wdt device driver initialize. */
int rt_hw_wdt_init(void)
{
rt_err_t ret;
hw_wdt_init();
device_wdt.ops = &ops_wdt;
ret = rt_hw_watchdog_register(&device_wdt, "wdt", RT_DEVICE_FLAG_RDWR, RT_NULL);
#if defined(RT_USING_PM)
rt_pm_device_register((struct rt_device *)&device_wdt, &device_pm_ops);
#endif
return (int)ret;
}
INIT_BOARD_EXPORT(rt_hw_wdt_init);
/* Register rt-thread device.init() entry. */
static rt_err_t wdt_init(rt_watchdog_t *dev)
{
soft_time_init(&soft_time);
hw_wdt_init();
return RT_EOK;
}
static uint32_t wdt_get_module_clock(void)
{
return (CLK_GetModuleClockSource(WDT_MODULE) << CLK_CLKSEL1_WDTSEL_Pos);
}
static uint32_t wdt_get_working_hz(void)
{
uint32_t clk, hz = 0;
clk = wdt_get_module_clock();
switch (clk)
{
case CLK_CLKSEL1_WDTSEL_LIRC:
hz = __LIRC;
break;
case CLK_CLKSEL1_WDTSEL_LXT:
hz = __LXT;
break;
case CLK_CLKSEL1_WDTSEL_HCLK_DIV2048:
hz = CLK_GetHCLKFreq() / 2048;
break;
default:
break;
}
return hz;
}
static void soft_time_init(soft_time_handle_t *const soft_time)
{
rt_memset((void *)soft_time, 0, sizeof(struct soft_time_handle));
}
static void soft_time_setup(uint32_t wanted_sec, uint32_t hz, soft_time_handle_t *const soft_time)
{
rt_base_t level;
level = rt_hw_interrupt_disable();
soft_time->expired = RT_FALSE;
soft_time->feed_dog = RT_FALSE;
soft_time->wanted_sec = wanted_sec;
soft_time->full_iterations = CONV_SEC_TO_IT(hz, wanted_sec);
soft_time->left_iterations = soft_time->full_iterations;
soft_time->report_sec = CONV_IT_TO_SEC(hz, soft_time->full_iterations);
soft_time->clock_hz = hz;
rt_hw_interrupt_enable(level);
}
static void soft_time_feed_dog(soft_time_handle_t *const soft_time)
{
soft_time->feed_dog = RT_TRUE;
}
/* Register rt-thread device.control() entry. */
static rt_err_t wdt_control(rt_watchdog_t *dev, int cmd, void *args)
{
uint32_t wanted_sec, hz;
uint32_t *buf;
rt_err_t ret = RT_EOK;
if (dev == NULL)
return -(RT_EINVAL);
SYS_UnlockReg();
hz = wdt_get_working_hz();
switch (cmd)
{
case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
if (args == RT_NULL)
{
ret = -RT_EINVAL;
break;
}
buf = (uint32_t *)args;
*buf = soft_time.report_sec;
break;
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
wanted_sec = *((uint32_t *)args);
if (wanted_sec == 0)
{
ret = -RT_EINVAL;
break;
}
soft_time_setup(wanted_sec, hz, &soft_time);
break;
case RT_DEVICE_CTRL_WDT_GET_TIMELEFT:
if (args == RT_NULL)
{
ret = -RT_EINVAL;
break;
}
buf = (uint32_t *)args;
*buf = CONV_IT_TO_SEC(hz, soft_time.left_iterations);
break;
case RT_DEVICE_CTRL_WDT_KEEPALIVE:
/* Make a mark that the application has fed the watchdog. */
soft_time_feed_dog(&soft_time);
break;
case RT_DEVICE_CTRL_WDT_START:
WDT_RESET_COUNTER();
WDT_Open(MIN_TOUTSEL, WDT_RESET_DELAY_1026CLK, TRUE, TRUE);
WDT_EnableInt();
break;
case RT_DEVICE_CTRL_WDT_STOP:
WDT_Close();
break;
default:
ret = -RT_ERROR;
}
SYS_LockReg();
return -(ret);
}
/* wdt interrupt entry */
void WDT_IRQHandler(void)
{
rt_interrupt_enter();
/* Clear wdt interrupt flag */
if (WDT_GET_TIMEOUT_INT_FLAG())
{
WDT_CLEAR_TIMEOUT_INT_FLAG();
}
/* Clear wdt wakeup flag */
if (WDT_GET_TIMEOUT_WAKEUP_FLAG())
{
WDT_CLEAR_TIMEOUT_WAKEUP_FLAG();
}
/* The soft time has not reached the configured timeout yet. Clear the wdt counter
any way to prevent the system from hardware wdt reset. */
if (soft_time.left_iterations-- > 0)
{
WDT_RESET_COUNTER();
}
/* The soft time reaches the configured timeout boundary. Clear the wdt
counter if he application has fed the dog at least once until now. */
else
{
if ((soft_time.feed_dog) && (!soft_time.expired))
{
WDT_RESET_COUNTER();
soft_time.feed_dog = RT_FALSE;
soft_time.left_iterations = soft_time.full_iterations;
}
else
{
/* Application does not feed the dog in time. */
soft_time.expired = RT_TRUE;
}
}
rt_interrupt_leave();
}
#endif /* BSP_USING_WDT */