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rt-thread-official/bsp/nuvoton/libraries/ma35/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
* 2020-3-25 Wayne First version
*
******************************************************************************/
#include <rtconfig.h>
#if defined(BSP_USING_WDT)
#include <rthw.h>
#include <rtdevice.h>
#include "NuMicro.h"
#define LOG_TAG "drv.wdt"
#define DBG_SECTION_NAME LOG_TAG
#define DBG_LEVEL LOG_LVL_ERROR
#define DBG_COLOR
#include <rtdbg.h>
/* Private define ---------------------------------------------------------------*/
enum
{
WDT_START = -1,
#if defined(BSP_USING_WDT0)
WDT0_IDX,
#endif
#if defined(BSP_USING_WDT1)
WDT1_IDX,
#endif
#if defined(BSP_USING_WDT2)
WDT2_IDX,
#endif
WDT_CNT
};
/* 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;
struct nu_wdt
{
struct rt_watchdog_device parent;
char *name;
WDT_T *base;
IRQn_Type irqn;
uint32_t modid;
struct soft_time_handle soft_time;
};
typedef struct nu_wdt *nu_wdt_t;
/* Private functions ------------------------------------------------------------*/
static rt_err_t nu_wdt_init(rt_watchdog_t *dev);
static rt_err_t nu_wdt_control(rt_watchdog_t *dev, int cmd, void *args);
static uint32_t nu_wdt_get_module_clock(nu_wdt_t);
static uint32_t nu_wdt_get_working_hz(nu_wdt_t);
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);
static void nu_wdt_isr(int vector, void *param);
/* Public functions -------------------------------------------------------------*/
/* Private variables ------------------------------------------------------------*/
static struct nu_wdt nu_wdt_arr [] =
{
#if defined(BSP_USING_WDT0)
{ .name = "wdt0", .base = WDT0, .irqn = WDT0_IRQn, .modid = WDT0_MODULE },
#endif
#if defined(BSP_USING_WDT1)
{ .name = "wdt1", .base = WDT1, .irqn = WDT1_IRQn, .modid = WDT1_MODULE },
#endif
#if defined(BSP_USING_WDT2)
{ .name = "wdt2", .base = WDT2, .irqn = WDT2_IRQn, .modid = WDT2_MODULE },
#endif
};
static struct rt_watchdog_ops ops_wdt =
{
.init = nu_wdt_init,
.control = nu_wdt_control,
};
/* wdt device driver initialize. */
int rt_hw_wdt_init(void)
{
int i;
rt_err_t ret = RT_EOK;
for (i = (WDT_START + 1); i < WDT_CNT; i++)
{
nu_wdt_t psNuWdt = &nu_wdt_arr[i];
if (WDT_GET_RESET_FLAG(psNuWdt->base))
{
LOG_W("%s: System re-boots from watchdog timer reset.\n", psNuWdt->name);
WDT_CLEAR_RESET_FLAG(psNuWdt->base);
}
psNuWdt->parent.ops = &ops_wdt;
ret = rt_hw_watchdog_register(&psNuWdt->parent, psNuWdt->name, RT_DEVICE_FLAG_RDWR, psNuWdt);
RT_ASSERT(ret == RT_EOK);
rt_hw_interrupt_install(psNuWdt->irqn, nu_wdt_isr, psNuWdt, psNuWdt->name);
rt_hw_interrupt_umask(psNuWdt->irqn);
}
return (int)ret;
}
INIT_BOARD_EXPORT(rt_hw_wdt_init);
/* Register rt-thread device.init() entry. */
static rt_err_t nu_wdt_init(rt_watchdog_t *dev)
{
nu_wdt_t psNuWdt = (nu_wdt_t)dev;
RT_ASSERT(dev != RT_NULL);
soft_time_init(&psNuWdt->soft_time);
return RT_EOK;
}
static uint32_t nu_wdt_get_module_clock(nu_wdt_t psNuWdt)
{
uint32_t ret = 0;
switch (psNuWdt->modid)
{
case WDT0_MODULE:
case WDT1_MODULE:
case WDT2_MODULE:
ret = CLK_GetModuleClockSource(psNuWdt->modid);
break;
default:
break;
}
return ret;
}
static uint32_t nu_wdt_get_working_hz(nu_wdt_t psNuWdt)
{
uint32_t src_clk, hz = 0;
src_clk = nu_wdt_get_module_clock(psNuWdt);
switch (src_clk)
{
case 1: /* CLK_CLKSEL3_WDT0SEL_LXT */
hz = __LXT;
break;
case 2: /* CLK_CLKSEL3_WDT0SEL_PCLK3_DIV4096 */
hz = CLK_GetPCLK3Freq() / 4096;
break;
case 3: /* CLK_CLKSEL3_WDT0SEL_LIRC */
hz = __LIRC;
break;
default:
break;
}
LOG_D("[%s] modid=%x src_clk=%d src_hz=%d\n", psNuWdt->name, psNuWdt->modid, src_clk, hz);
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);
LOG_D("wanted_sec=%d\n", soft_time->wanted_sec);
LOG_D("full_iterations=%d\n", soft_time->full_iterations);
LOG_D("left_iterations=%d\n", soft_time->left_iterations);
LOG_D("report_sec=%d\n", soft_time->report_sec);
LOG_D("clock_hz=%d\n", soft_time->clock_hz);
}
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 nu_wdt_control(rt_watchdog_t *dev, int cmd, void *args)
{
uint32_t wanted_sec, hz;
rt_err_t ret = RT_EOK;
nu_wdt_t psNuWdt = (nu_wdt_t)dev;
RT_ASSERT(dev);
//SYS_UnlockReg();
hz = nu_wdt_get_working_hz(psNuWdt);
switch (cmd)
{
case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
if (args == RT_NULL)
{
ret = -RT_EINVAL;
break;
}
*((uint32_t *)args) = psNuWdt->soft_time.report_sec;
LOG_D("[GET]report_sec=%d\n", psNuWdt->soft_time.report_sec);
break;
case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
if (args == RT_NULL)
{
ret = -RT_EINVAL;
break;
}
wanted_sec = *((uint32_t *)args);
if (wanted_sec == 0)
{
ret = -RT_EINVAL;
break;
}
soft_time_setup(wanted_sec, hz, &psNuWdt->soft_time);
LOG_D("[SET]report_sec=%d\n", psNuWdt->soft_time.report_sec);
break;
case RT_DEVICE_CTRL_WDT_GET_TIMELEFT:
if (args == RT_NULL)
{
ret = -RT_EINVAL;
break;
}
*((uint32_t *)args) = CONV_IT_TO_SEC(hz, psNuWdt->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(&psNuWdt->soft_time);
break;
case RT_DEVICE_CTRL_WDT_START:
WDT_RESET_COUNTER(psNuWdt->base);
WDT_Open(psNuWdt->base, MIN_TOUTSEL, WDT_RESET_DELAY_1026CLK, TRUE, TRUE);
WDT_EnableInt(psNuWdt->base);
break;
case RT_DEVICE_CTRL_WDT_STOP:
WDT_Close(psNuWdt->base);
break;
default:
ret = -RT_ERROR;
}
//SYS_LockReg();
return -(ret);
}
/* wdt interrupt entry */
static void nu_wdt_isr(int vector, void *param)
{
nu_wdt_t psNuWdt = (nu_wdt_t)param;
RT_ASSERT(param != RT_NULL);
/* Clear wdt interrupt flag */
if (WDT_GET_TIMEOUT_INT_FLAG(psNuWdt->base))
{
WDT_CLEAR_TIMEOUT_INT_FLAG(psNuWdt->base);
}
/* Clear wdt wakeup flag */
if (WDT_GET_TIMEOUT_WAKEUP_FLAG(psNuWdt->base))
{
WDT_CLEAR_TIMEOUT_WAKEUP_FLAG(psNuWdt->base);
}
/* 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 (psNuWdt->soft_time.left_iterations-- > 0)
{
WDT_RESET_COUNTER(psNuWdt->base);
}
/* 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 ((psNuWdt->soft_time.feed_dog) && (!psNuWdt->soft_time.expired))
{
WDT_RESET_COUNTER(psNuWdt->base);
psNuWdt->soft_time.feed_dog = RT_FALSE;
psNuWdt->soft_time.left_iterations = psNuWdt->soft_time.full_iterations;
}
else
{
/* Application does not feed the dog in time. */
psNuWdt->soft_time.expired = RT_TRUE;
}
}
}
#endif /* BSP_USING_WDT */
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