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diff --git a/arch/powerpc/platforms/maple/time.c b/arch/powerpc/platforms/maple/time.c
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+/*
+ * arch/ppc64/kernel/maple_time.c
+ *
+ * (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
+ * IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <linux/interrupt.h>
+#include <linux/mc146818rtc.h>
+#include <linux/bcd.h>
+
+#include <asm/sections.h>
+#include <asm/prom.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/machdep.h>
+#include <asm/time.h>
+
+#include "maple.h"
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+extern void GregorianDay(struct rtc_time * tm);
+
+static int maple_rtc_addr;
+
+static int maple_clock_read(int addr)
+{
+ outb_p(addr, maple_rtc_addr);
+ return inb_p(maple_rtc_addr+1);
+}
+
+static void maple_clock_write(unsigned long val, int addr)
+{
+ outb_p(addr, maple_rtc_addr);
+ outb_p(val, maple_rtc_addr+1);
+}
+
+void maple_get_rtc_time(struct rtc_time *tm)
+{
+ int uip, i;
+
+ /* The Linux interpretation of the CMOS clock register contents:
+ * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
+ * RTC registers show the second which has precisely just started.
+ * Let's hope other operating systems interpret the RTC the same way.
+ */
+
+ /* Since the UIP flag is set for about 2.2 ms and the clock
+ * is typically written with a precision of 1 jiffy, trying
+ * to obtain a precision better than a few milliseconds is
+ * an illusion. Only consistency is interesting, this also
+ * allows to use the routine for /dev/rtc without a potential
+ * 1 second kernel busy loop triggered by any reader of /dev/rtc.
+ */
+
+ for (i = 0; i<1000000; i++) {
+ uip = maple_clock_read(RTC_FREQ_SELECT);
+ tm->tm_sec = maple_clock_read(RTC_SECONDS);
+ tm->tm_min = maple_clock_read(RTC_MINUTES);
+ tm->tm_hour = maple_clock_read(RTC_HOURS);
+ tm->tm_mday = maple_clock_read(RTC_DAY_OF_MONTH);
+ tm->tm_mon = maple_clock_read(RTC_MONTH);
+ tm->tm_year = maple_clock_read(RTC_YEAR);
+ uip |= maple_clock_read(RTC_FREQ_SELECT);
+ if ((uip & RTC_UIP)==0)
+ break;
+ }
+
+ if (!(maple_clock_read(RTC_CONTROL) & RTC_DM_BINARY)
+ || RTC_ALWAYS_BCD) {
+ BCD_TO_BIN(tm->tm_sec);
+ BCD_TO_BIN(tm->tm_min);
+ BCD_TO_BIN(tm->tm_hour);
+ BCD_TO_BIN(tm->tm_mday);
+ BCD_TO_BIN(tm->tm_mon);
+ BCD_TO_BIN(tm->tm_year);
+ }
+ if ((tm->tm_year + 1900) < 1970)
+ tm->tm_year += 100;
+
+ GregorianDay(tm);
+}
+
+int maple_set_rtc_time(struct rtc_time *tm)
+{
+ unsigned char save_control, save_freq_select;
+ int sec, min, hour, mon, mday, year;
+
+ spin_lock(&rtc_lock);
+
+ save_control = maple_clock_read(RTC_CONTROL); /* tell the clock it's being set */
+
+ maple_clock_write((save_control|RTC_SET), RTC_CONTROL);
+
+ save_freq_select = maple_clock_read(RTC_FREQ_SELECT); /* stop and reset prescaler */
+
+ maple_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+ sec = tm->tm_sec;
+ min = tm->tm_min;
+ hour = tm->tm_hour;
+ mon = tm->tm_mon;
+ mday = tm->tm_mday;
+ year = tm->tm_year;
+
+ if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ BIN_TO_BCD(sec);
+ BIN_TO_BCD(min);
+ BIN_TO_BCD(hour);
+ BIN_TO_BCD(mon);
+ BIN_TO_BCD(mday);
+ BIN_TO_BCD(year);
+ }
+ maple_clock_write(sec, RTC_SECONDS);
+ maple_clock_write(min, RTC_MINUTES);
+ maple_clock_write(hour, RTC_HOURS);
+ maple_clock_write(mon, RTC_MONTH);
+ maple_clock_write(mday, RTC_DAY_OF_MONTH);
+ maple_clock_write(year, RTC_YEAR);
+
+ /* The following flags have to be released exactly in this order,
+ * otherwise the DS12887 (popular MC146818A clone with integrated
+ * battery and quartz) will not reset the oscillator and will not
+ * update precisely 500 ms later. You won't find this mentioned in
+ * the Dallas Semiconductor data sheets, but who believes data
+ * sheets anyway ... -- Markus Kuhn
+ */
+ maple_clock_write(save_control, RTC_CONTROL);
+ maple_clock_write(save_freq_select, RTC_FREQ_SELECT);
+
+ spin_unlock(&rtc_lock);
+
+ return 0;
+}
+
+unsigned long __init maple_get_boot_time(void)
+{
+ struct rtc_time tm;
+ struct device_node *rtcs;
+
+ rtcs = find_compatible_devices("rtc", "pnpPNP,b00");
+ if (rtcs && rtcs->addrs) {
+ maple_rtc_addr = rtcs->addrs[0].address;
+ printk(KERN_INFO "Maple: Found RTC at 0x%x\n", maple_rtc_addr);
+ } else {
+ maple_rtc_addr = RTC_PORT(0); /* legacy address */
+ printk(KERN_INFO "Maple: No device node for RTC, assuming "
+ "legacy address (0x%x)\n", maple_rtc_addr);
+ }
+
+ maple_get_rtc_time(&tm);
+ return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec);
+}
+