bsp: ls2k: internal rtc driver

hardware date format
  year, the same as ctime
  month 1 ~ 12
  no leap second

Signed-off-by: Du Huanpeng <548708880@qq.com>

bsp/ls2kdev/drivers/drv_rtc.c

@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2020, Du Huanpeng <548708880@qq.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-01-30     armink       the first version
+ * 2020-06-23     Du Huanpeng  based on components/drivers/rtc/soft_rtc.c
+ */
+
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <rtthread.h>
+#include "ls2k1000.h"
+
+struct loongson_rtc {
+    rt_uint32_t sys_toytrim;
+    rt_uint32_t sys_toywrite0;
+    rt_uint32_t sys_toywrite1;
+    rt_uint32_t sys_toyread0;
+    rt_uint32_t sys_toyread1;
+    rt_uint32_t sys_toymatch0;
+    rt_uint32_t sys_toymatch1;
+    rt_uint32_t sys_toymatch2;
+    rt_uint32_t sys_rtcctrl;
+    rt_uint32_t __pad4[3];
+    rt_uint32_t __pad5[4];
+    rt_uint32_t sys_rtctrim;
+    rt_uint32_t sys_rtcwrite0;
+    rt_uint32_t sys_rtcread0;
+    rt_uint32_t sys_rtcmatch0;
+    rt_uint32_t sys_rtcmatch1;
+    rt_uint32_t sys_rtcmatch2;
+};
+
+/* bit field helpers. */
+#define __M(n)               (~(~0<<(n)))
+#define __RBF(number, n)     ((number)&__M(n))
+#define __BF(number, n, m)   __RBF((number>>m), (n-m+1))
+#define BF(number, n, m)     (m<n ? __BF(number, n, m) : __BF(number, m, n))
+
+struct rtctime {
+    rt_uint32_t sys_toyread0;
+    rt_uint32_t sys_toyread1;
+    rt_uint32_t sys_rtcread0;
+};
+typedef struct rtctime rtctime_t;
+
+struct tm *localrtctime(const rtctime_t *rtctp)
+{
+    static struct tm time;
+    int msec;
+
+    msec = BF(rtctp->sys_toyread0, 3, 0);
+    msec *= 100;
+
+    time.tm_sec   = BF(rtctp->sys_toyread0,  9,  4);
+    time.tm_min   = BF(rtctp->sys_toyread0, 15, 10);
+    time.tm_hour  = BF(rtctp->sys_toyread0, 20, 16);
+    time.tm_mday  = BF(rtctp->sys_toyread0, 21, 25);
+    time.tm_mon   = BF(rtctp->sys_toyread0, 26, 31);
+    /* struct tm has three more members:
+         time.tm_isdst
+         time.tm_wday
+         time.tm_yday
+    */
+    time.tm_mon -= 1;
+    time.tm_year = rtctp->sys_toyread1;
+    return &time;
+}
+
+rtctime_t mkrtctime(struct tm *tm)
+{
+    rtctime_t rtctm;
+    struct tm tmptime;
+
+    rtctm.sys_toyread0 <<= 31 - 26 + 1;
+    rtctm.sys_toyread0  |= tm->tm_mon + 1;
+    rtctm.sys_toyread0 <<= 25 - 21 + 1;
+    rtctm.sys_toyread0  |= tm->tm_mday;
+    rtctm.sys_toyread0 <<= 20 - 16 + 1;
+    rtctm.sys_toyread0  |= tm->tm_hour;
+    rtctm.sys_toyread0 <<= 15 - 10 + 1;
+    rtctm.sys_toyread0  |= tm->tm_min;
+    rtctm.sys_toyread0 <<= 9 - 4 + 1;
+    rtctm.sys_toyread0  |= tm->tm_sec;
+    /* Fixme: 0.1 second */
+    rtctm.sys_toyread0 <<= 3 - 0 + 1;
+    rtctm.sys_toyread0  |= 0;
+
+    rtctm.sys_toyread1 = tm->tm_year;
+
+    tmptime = *localrtctime(&rtctm);
+
+    return rtctm;
+}
+
+static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
+{
+    return RT_EOK;
+}
+
+static rt_size_t rt_rtc_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
+{
+    return 0;
+}
+
+static rt_err_t rt_rtc_ioctl(rt_device_t dev, int cmd, void *args)
+{
+    rt_err_t err = RT_ENOSYS;
+
+    static int count = 0;
+
+    struct loongson_rtc *hw_rtc;
+    rtctime_t rtctm;
+    struct tm time;
+    struct tm tmptime;
+    time_t *t;
+
+    hw_rtc = dev->user_data;
+
+    t = (time_t *)args;
+    time = *localtime(t);
+
+    rtctm.sys_toyread0 = hw_rtc->sys_toyread0;
+    rtctm.sys_toyread1 = hw_rtc->sys_toyread1;
+    rtctm.sys_rtcread0 = hw_rtc->sys_rtcread0;
+    tmptime = *localrtctime(&rtctm);
+
+    switch (cmd) {
+    case RT_DEVICE_CTRL_RTC_GET_TIME:
+        *t = mktime(&tmptime);
+        break;
+    case RT_DEVICE_CTRL_RTC_SET_TIME:
+        tmptime.tm_hour = time.tm_hour;
+        tmptime.tm_min  = time.tm_min;
+        tmptime.tm_sec  = time.tm_sec;
+
+        tmptime.tm_year = time.tm_year;
+        tmptime.tm_mon  = time.tm_mon;
+        tmptime.tm_mday = time.tm_mday;
+
+        rtctm = mkrtctime(&tmptime);
+        /* write to hw RTC */
+        hw_rtc->sys_toywrite0 = rtctm.sys_toyread0;
+        hw_rtc->sys_toywrite1 = rtctm.sys_toyread1;
+        break;
+    case RT_DEVICE_CTRL_RTC_GET_ALARM:
+        break;
+    case RT_DEVICE_CTRL_RTC_SET_ALARM:
+        break;
+    default:
+        break;
+    }
+
+    return RT_EOK;
+}
+
+int rt_hw_rtc_init(void)
+{
+    static struct rt_device rtc = {
+        .type      = RT_Device_Class_RTC,
+        .init      = RT_NULL,
+        .open      = rt_rtc_open,
+        .close     = RT_NULL,
+        .read      = rt_rtc_read,
+        .write     = RT_NULL,
+        .control   = rt_rtc_ioctl,
+        .user_data = (void *)RTC_BASE,
+    };
+    rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
+}
+
+INIT_DEVICE_EXPORT(rt_hw_rtc_init);

bsp/ls2kdev/drivers/ls2k1000.h

@@ -9,6 +9,7 @@
 
 #define GPIO_BASE 0xFFFFFFFFBFE10500
 #define PLL_SYS_BASE 0xFFFFFFFFBFE10480
+#define RTC_BASE 0xFFFFFFFFBFE07820
 
 void rt_hw_timer_handler(void);
 void rt_hw_uart_init(void);