1 files changed, 93 insertions, 0 deletions

diff --git a/arch/sh/boards/landisk/rtc.c b/arch/sh/boards/landisk/rtc.c
new file mode 100644
index 000000000000..35ba726a0979
--- /dev/null
+++ b/arch/sh/boards/landisk/rtc.c
@@ -0,0 +1,93 @@
+/*
+ * arch/sh/boards/landisk/rtc.c --  RTC support
+ *
+ *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
+ *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
+ */
+/*
+ * modifed by kogiidena
+ * 2005.09.16
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/bcd.h>
+#include <asm/rtc.h>
+
+extern spinlock_t rtc_lock;
+
+extern void
+rs5c313_set_cmos_time(unsigned int BCD_yr, unsigned int BCD_mon,
+                      unsigned int BCD_day, unsigned int BCD_hr,
+                      unsigned int BCD_min, unsigned int BCD_sec);
+
+extern unsigned long
+rs5c313_get_cmos_time(unsigned int *BCD_yr, unsigned int *BCD_mon,
+                      unsigned int *BCD_day, unsigned int *BCD_hr,
+                      unsigned int *BCD_min, unsigned int *BCD_sec);
+
+void landisk_rtc_gettimeofday(struct timespec *tv)
+{
+        unsigned int BCD_yr, BCD_mon, BCD_day, BCD_hr, BCD_min, BCD_sec;
+        unsigned long flags;
+
+        spin_lock_irqsave(&rtc_lock, flags);
+        tv->tv_sec = rs5c313_get_cmos_time
+            (&BCD_yr, &BCD_mon, &BCD_day, &BCD_hr, &BCD_min, &BCD_sec);
+        tv->tv_nsec = 0;
+        spin_unlock_irqrestore(&rtc_lock, flags);
+}
+
+int landisk_rtc_settimeofday(const time_t secs)
+{
+        int retval = 0;
+        int real_seconds, real_minutes, cmos_minutes;
+        unsigned long flags;
+        unsigned long nowtime = secs;
+        unsigned int BCD_yr, BCD_mon, BCD_day, BCD_hr, BCD_min, BCD_sec;
+
+        spin_lock_irqsave(&rtc_lock, flags);
+
+        rs5c313_get_cmos_time
+          (&BCD_yr, &BCD_mon, &BCD_day, &BCD_hr, &BCD_min, &BCD_sec);
+        cmos_minutes = BCD_min;
+        BCD_TO_BIN(cmos_minutes);
+
+        /*
+         * since we're only adjusting minutes and seconds,
+         * don't interfere with hour overflow. This avoids
+         * messing with unknown time zones but requires your
+         * RTC not to be off by more than 15 minutes
+         */
+        real_seconds = nowtime % 60;
+        real_minutes = nowtime / 60;
+        if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1)
+                real_minutes += 30;     /* correct for half hour time zone */
+        real_minutes %= 60;
+
+        if (abs(real_minutes - cmos_minutes) < 30) {
+                BIN_TO_BCD(real_seconds);
+                BIN_TO_BCD(real_minutes);
+                rs5c313_set_cmos_time(BCD_yr, BCD_mon, BCD_day, BCD_hr,
+                                      real_minutes, real_seconds);
+        } else {
+                printk(KERN_WARNING
+                       "set_rtc_time: can't update from %d to %d\n",
+                       cmos_minutes, real_minutes);
+                retval = -1;
+        }
+
+        spin_unlock_irqrestore(&rtc_lock, flags);
+        return retval;
+}
+
+void landisk_time_init(void)
+{
+        rtc_sh_get_time = landisk_rtc_gettimeofday;
+        rtc_sh_set_time = landisk_rtc_settimeofday;
+}