1 files changed, 114 insertions, 0 deletions

diff --git a/arch/m68k/kernel/time_mm.c b/arch/m68k/kernel/time_mm.c
new file mode 100644
index 000000000000..18b34ee5db3b
--- /dev/null
+++ b/arch/m68k/kernel/time_mm.c
@@ -0,0 +1,114 @@
+/*
+ *  linux/arch/m68k/kernel/time.c
+ *
+ *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *
+ * This file contains the m68k-specific time handling details.
+ * Most of the stuff is located in the machine specific files.
+ *
+ * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
+ *              "A Kernel Model for Precision Timekeeping" by Dave Mills
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/irq_regs.h>
+
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/profile.h>
+
+static inline int set_rtc_mmss(unsigned long nowtime)
+{
+  if (mach_set_clock_mmss)
+    return mach_set_clock_mmss (nowtime);
+  return -1;
+}
+
+/*
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "xtime_update()" routine every clocktick
+ */
+static irqreturn_t timer_interrupt(int irq, void *dummy)
+{
+        xtime_update(1);
+        update_process_times(user_mode(get_irq_regs()));
+        profile_tick(CPU_PROFILING);
+
+#ifdef CONFIG_HEARTBEAT
+        /* use power LED as a heartbeat instead -- much more useful
+           for debugging -- based on the version for PReP by Cort */
+        /* acts like an actual heart beat -- ie thump-thump-pause... */
+        if (mach_heartbeat) {
+            static unsigned cnt = 0, period = 0, dist = 0;
+
+            if (cnt == 0 || cnt == dist)
+                mach_heartbeat( 1 );
+            else if (cnt == 7 || cnt == dist+7)
+                mach_heartbeat( 0 );
+
+            if (++cnt > period) {
+                cnt = 0;
+                /* The hyperbolic function below modifies the heartbeat period
+                 * length in dependency of the current (5min) load. It goes
+                 * through the points f(0)=126, f(1)=86, f(5)=51,
+                 * f(inf)->30. */
+                period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
+                dist = period / 4;
+            }
+        }
+#endif /* CONFIG_HEARTBEAT */
+        return IRQ_HANDLED;
+}
+
+void read_persistent_clock(struct timespec *ts)
+{
+        struct rtc_time time;
+        ts->tv_sec = 0;
+        ts->tv_nsec = 0;
+
+        if (mach_hwclk) {
+                mach_hwclk(0, &time);
+
+                if ((time.tm_year += 1900) < 1970)
+                        time.tm_year += 100;
+                ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
+                                      time.tm_hour, time.tm_min, time.tm_sec);
+        }
+}
+
+void __init time_init(void)
+{
+        mach_sched_init(timer_interrupt);
+}
+
+u32 arch_gettimeoffset(void)
+{
+        return mach_gettimeoffset() * 1000;
+}
+
+static int __init rtc_init(void)
+{
+        struct platform_device *pdev;
+
+        if (!mach_hwclk)
+                return -ENODEV;
+
+        pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
+        if (IS_ERR(pdev))
+                return PTR_ERR(pdev);
+
+        return 0;
+}
+
+module_init(rtc_init);