添加rtthread相关代码

riscv/rtthread/components/drivers/watchdog/watchdog.c

@@ -0,0 +1,110 @@
+/*
+ * COPYRIGHT (C) 2011-2023, Real-Thread Information Technology Ltd
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-09-12     heyuanjie87  first version.
+ * 2014-03-04     Bernard      code cleanup
+ */
+
+#include <drivers/watchdog.h>
+
+/* RT-Thread Device Interface */
+
+/*
+ * This function initializes watchdog
+ */
+static rt_err_t rt_watchdog_init(struct rt_device *dev)
+{
+    rt_watchdog_t *wtd;
+
+    RT_ASSERT(dev != RT_NULL);
+    wtd = (rt_watchdog_t *)dev;
+    if (wtd->ops->init)
+    {
+        return (wtd->ops->init(wtd));
+    }
+
+    return (-RT_ENOSYS);
+}
+
+static rt_err_t rt_watchdog_open(struct rt_device *dev, rt_uint16_t oflag)
+{
+    return (RT_EOK);
+}
+
+static rt_err_t rt_watchdog_close(struct rt_device *dev)
+{
+    rt_watchdog_t *wtd;
+
+    RT_ASSERT(dev != RT_NULL);
+    wtd = (rt_watchdog_t *)dev;
+
+    if (wtd->ops->control(wtd, RT_DEVICE_CTRL_WDT_STOP, RT_NULL) != RT_EOK)
+    {
+        rt_kprintf(" This watchdog can not be stoped\n");
+
+        return (-RT_ERROR);
+    }
+
+    return (RT_EOK);
+}
+
+static rt_err_t rt_watchdog_control(struct rt_device *dev,
+                                    int              cmd,
+                                    void             *args)
+{
+    rt_watchdog_t *wtd;
+
+    RT_ASSERT(dev != RT_NULL);
+    wtd = (rt_watchdog_t *)dev;
+
+    return (wtd->ops->control(wtd, cmd, args));
+}
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops wdt_ops =
+{
+    rt_watchdog_init,
+    rt_watchdog_open,
+    rt_watchdog_close,
+    RT_NULL,
+    RT_NULL,
+    rt_watchdog_control,
+};
+#endif
+
+/**
+ * This function register a watchdog device
+ */
+rt_err_t rt_hw_watchdog_register(struct rt_watchdog_device *wtd,
+                                 const char                *name,
+                                 rt_uint32_t                flag,
+                                 void                      *data)
+{
+    struct rt_device *device;
+    RT_ASSERT(wtd != RT_NULL);
+
+    device = &(wtd->parent);
+
+    device->type        = RT_Device_Class_WDT;
+    device->rx_indicate = RT_NULL;
+    device->tx_complete = RT_NULL;
+
+#ifdef RT_USING_DEVICE_OPS
+    device->ops         = &wdt_ops;
+#else
+    device->init        = rt_watchdog_init;
+    device->open        = rt_watchdog_open;
+    device->close       = rt_watchdog_close;
+    device->read        = RT_NULL;
+    device->write       = RT_NULL;
+    device->control     = rt_watchdog_control;
+#endif
+    device->user_data   = data;
+
+    /* register a character device */
+    return rt_device_register(device, name, flag);
+}