Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1195 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
new file mode 100644
index 000000000000..6a717d4d2bc5
--- /dev/null
+++ b/arch/sparc64/kernel/time.c
@@ -0,0 +1,1195 @@
+/* $Id: time.c,v 1.42 2002/01/23 14:33:55 davem Exp $
+ * time.c: UltraSparc timer and TOD clock support.
+ *
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1998 Eddie C. Dost   (ecd@skynet.be)
+ *
+ * Based largely on code which is:
+ *
+ * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
+ */
+
+#include <linux/config.h>
+#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/interrupt.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/mc146818rtc.h>
+#include <linux/delay.h>
+#include <linux/profile.h>
+#include <linux/bcd.h>
+#include <linux/jiffies.h>
+#include <linux/cpufreq.h>
+#include <linux/percpu.h>
+#include <linux/profile.h>
+
+#include <asm/oplib.h>
+#include <asm/mostek.h>
+#include <asm/timer.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/sbus.h>
+#include <asm/fhc.h>
+#include <asm/pbm.h>
+#include <asm/ebus.h>
+#include <asm/isa.h>
+#include <asm/starfire.h>
+#include <asm/smp.h>
+#include <asm/sections.h>
+#include <asm/cpudata.h>
+
+DEFINE_SPINLOCK(mostek_lock);
+DEFINE_SPINLOCK(rtc_lock);
+unsigned long mstk48t02_regs = 0UL;
+#ifdef CONFIG_PCI
+unsigned long ds1287_regs = 0UL;
+#endif
+
+extern unsigned long wall_jiffies;
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+
+EXPORT_SYMBOL(jiffies_64);
+
+static unsigned long mstk48t08_regs = 0UL;
+static unsigned long mstk48t59_regs = 0UL;
+
+static int set_rtc_mmss(unsigned long);
+
+static __init unsigned long dummy_get_tick(void)
+{
+	return 0;
+}
+
+static __initdata struct sparc64_tick_ops dummy_tick_ops = {
+	.get_tick	= dummy_get_tick,
+};
+
+struct sparc64_tick_ops *tick_ops = &dummy_tick_ops;
+
+#define TICK_PRIV_BIT	(1UL << 63)
+
+#ifdef CONFIG_SMP
+unsigned long profile_pc(struct pt_regs *regs)
+{
+	unsigned long pc = instruction_pointer(regs);
+
+	if (in_lock_functions(pc))
+		return regs->u_regs[UREG_RETPC];
+	return pc;
+}
+EXPORT_SYMBOL(profile_pc);
+#endif
+
+static void tick_disable_protection(void)
+{
+	/* Set things up so user can access tick register for profiling
+	 * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
+	 * read back of %tick after writing it.
+	 */
+	__asm__ __volatile__(
+	"	ba,pt	%%xcc, 1f\n"
+	"	 nop\n"
+	"	.align	64\n"
+	"1:	rd	%%tick, %%g2\n"
+	"	add	%%g2, 6, %%g2\n"
+	"	andn	%%g2, %0, %%g2\n"
+	"	wrpr	%%g2, 0, %%tick\n"
+	"	rdpr	%%tick, %%g0"
+	: /* no outputs */
+	: "r" (TICK_PRIV_BIT)
+	: "g2");
+}
+
+static void tick_init_tick(unsigned long offset)
+{
+	tick_disable_protection();
+
+	__asm__ __volatile__(
+	"	rd	%%tick, %%g1\n"
+	"	andn	%%g1, %1, %%g1\n"
+	"	ba,pt	%%xcc, 1f\n"
+	"	 add	%%g1, %0, %%g1\n"
+	"	.align	64\n"
+	"1:	wr	%%g1, 0x0, %%tick_cmpr\n"
+	"	rd	%%tick_cmpr, %%g0"
+	: /* no outputs */
+	: "r" (offset), "r" (TICK_PRIV_BIT)
+	: "g1");
+}
+
+static unsigned long tick_get_tick(void)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("rd	%%tick, %0\n\t"
+			     "mov	%0, %0"
+			     : "=r" (ret));
+
+	return ret & ~TICK_PRIV_BIT;
+}
+
+static unsigned long tick_get_compare(void)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("rd	%%tick_cmpr, %0\n\t"
+			     "mov	%0, %0"
+			     : "=r" (ret));
+
+	return ret;
+}
+
+static unsigned long tick_add_compare(unsigned long adj)
+{
+	unsigned long new_compare;
+
+	/* Workaround for Spitfire Errata (#54 I think??), I discovered
+	 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
+	 * number 103640.
+	 *
+	 * On Blackbird writes to %tick_cmpr can fail, the
+	 * workaround seems to be to execute the wr instruction
+	 * at the start of an I-cache line, and perform a dummy
+	 * read back from %tick_cmpr right after writing to it. -DaveM
+	 */
+	__asm__ __volatile__("rd	%%tick_cmpr, %0\n\t"
+			     "ba,pt	%%xcc, 1f\n\t"
+			     " add	%0, %1, %0\n\t"
+			     ".align	64\n"
+			     "1:\n\t"
+			     "wr	%0, 0, %%tick_cmpr\n\t"
+			     "rd	%%tick_cmpr, %%g0"
+			     : "=&r" (new_compare)
+			     : "r" (adj));
+
+	return new_compare;
+}
+
+static unsigned long tick_add_tick(unsigned long adj, unsigned long offset)
+{
+	unsigned long new_tick, tmp;
+
+	/* Also need to handle Blackbird bug here too. */
+	__asm__ __volatile__("rd	%%tick, %0\n\t"
+			     "add	%0, %2, %0\n\t"
+			     "wrpr	%0, 0, %%tick\n\t"
+			     "andn	%0, %4, %1\n\t"
+			     "ba,pt	%%xcc, 1f\n\t"
+			     " add	%1, %3, %1\n\t"
+			     ".align	64\n"
+			     "1:\n\t"
+			     "wr	%1, 0, %%tick_cmpr\n\t"
+			     "rd	%%tick_cmpr, %%g0"
+			     : "=&r" (new_tick), "=&r" (tmp)
+			     : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT));
+
+	return new_tick;
+}
+
+static struct sparc64_tick_ops tick_operations = {
+	.init_tick	=	tick_init_tick,
+	.get_tick	=	tick_get_tick,
+	.get_compare	=	tick_get_compare,
+	.add_tick	=	tick_add_tick,
+	.add_compare	=	tick_add_compare,
+	.softint_mask	=	1UL << 0,
+};
+
+static void stick_init_tick(unsigned long offset)
+{
+	tick_disable_protection();
+
+	/* Let the user get at STICK too. */
+	__asm__ __volatile__(
+	"	rd	%%asr24, %%g2\n"
+	"	andn	%%g2, %0, %%g2\n"
+	"	wr	%%g2, 0, %%asr24"
+	: /* no outputs */
+	: "r" (TICK_PRIV_BIT)
+	: "g1", "g2");
+
+	__asm__ __volatile__(
+	"	rd	%%asr24, %%g1\n"
+	"	andn	%%g1, %1, %%g1\n"
+	"	add	%%g1, %0, %%g1\n"
+	"	wr	%%g1, 0x0, %%asr25"
+	: /* no outputs */
+	: "r" (offset), "r" (TICK_PRIV_BIT)
+	: "g1");
+}
+
+static unsigned long stick_get_tick(void)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("rd	%%asr24, %0"
+			     : "=r" (ret));
+
+	return ret & ~TICK_PRIV_BIT;
+}
+
+static unsigned long stick_get_compare(void)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("rd	%%asr25, %0"
+			     : "=r" (ret));
+
+	return ret;
+}
+
+static unsigned long stick_add_tick(unsigned long adj, unsigned long offset)
+{
+	unsigned long new_tick, tmp;
+
+	__asm__ __volatile__("rd	%%asr24, %0\n\t"
+			     "add	%0, %2, %0\n\t"
+			     "wr	%0, 0, %%asr24\n\t"
+			     "andn	%0, %4, %1\n\t"
+			     "add	%1, %3, %1\n\t"
+			     "wr	%1, 0, %%asr25"
+			     : "=&r" (new_tick), "=&r" (tmp)
+			     : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT));
+
+	return new_tick;
+}
+
+static unsigned long stick_add_compare(unsigned long adj)
+{
+	unsigned long new_compare;
+
+	__asm__ __volatile__("rd	%%asr25, %0\n\t"
+			     "add	%0, %1, %0\n\t"
+			     "wr	%0, 0, %%asr25"
+			     : "=&r" (new_compare)
+			     : "r" (adj));
+
+	return new_compare;
+}
+
+static struct sparc64_tick_ops stick_operations = {
+	.init_tick	=	stick_init_tick,
+	.get_tick	=	stick_get_tick,
+	.get_compare	=	stick_get_compare,
+	.add_tick	=	stick_add_tick,
+	.add_compare	=	stick_add_compare,
+	.softint_mask	=	1UL << 16,
+};
+
+/* On Hummingbird the STICK/STICK_CMPR register is implemented
+ * in I/O space.  There are two 64-bit registers each, the
+ * first holds the low 32-bits of the value and the second holds
+ * the high 32-bits.
+ *
+ * Since STICK is constantly updating, we have to access it carefully.
+ *
+ * The sequence we use to read is:
+ * 1) read low
+ * 2) read high
+ * 3) read low again, if it rolled over increment high by 1
+ *
+ * Writing STICK safely is also tricky:
+ * 1) write low to zero
+ * 2) write high
+ * 3) write low
+ */
+#define HBIRD_STICKCMP_ADDR	0x1fe0000f060UL
+#define HBIRD_STICK_ADDR	0x1fe0000f070UL
+
+static unsigned long __hbird_read_stick(void)
+{
+	unsigned long ret, tmp1, tmp2, tmp3;
+	unsigned long addr = HBIRD_STICK_ADDR;
+
+	__asm__ __volatile__("ldxa	[%1] %5, %2\n\t"
+			     "add	%1, 0x8, %1\n\t"
+			     "ldxa	[%1] %5, %3\n\t"
+			     "sub	%1, 0x8, %1\n\t"
+			     "ldxa	[%1] %5, %4\n\t"
+			     "cmp	%4, %2\n\t"
+			     "blu,a,pn	%%xcc, 1f\n\t"
+			     " add	%3, 1, %3\n"
+			     "1:\n\t"
+			     "sllx	%3, 32, %3\n\t"
+			     "or	%3, %4, %0\n\t"
+			     : "=&r" (ret), "=&r" (addr),
+			       "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
+			     : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
+
+	return ret;
+}
+
+static unsigned long __hbird_read_compare(void)
+{
+	unsigned long low, high;
+	unsigned long addr = HBIRD_STICKCMP_ADDR;
+
+	__asm__ __volatile__("ldxa	[%2] %3, %0\n\t"
+			     "add	%2, 0x8, %2\n\t"
+			     "ldxa	[%2] %3, %1"
+			     : "=&r" (low), "=&r" (high), "=&r" (addr)
+			     : "i" (ASI_PHYS_BYPASS_EC_E), "2" (addr));
+
+	return (high << 32UL) | low;
+}
+
+static void __hbird_write_stick(unsigned long val)
+{
+	unsigned long low = (val & 0xffffffffUL);
+	unsigned long high = (val >> 32UL);
+	unsigned long addr = HBIRD_STICK_ADDR;
+
+	__asm__ __volatile__("stxa	%%g0, [%0] %4\n\t"
+			     "add	%0, 0x8, %0\n\t"
+			     "stxa	%3, [%0] %4\n\t"
+			     "sub	%0, 0x8, %0\n\t"
+			     "stxa	%2, [%0] %4"
+			     : "=&r" (addr)
+			     : "0" (addr), "r" (low), "r" (high),
+			       "i" (ASI_PHYS_BYPASS_EC_E));
+}
+
+static void __hbird_write_compare(unsigned long val)
+{
+	unsigned long low = (val & 0xffffffffUL);
+	unsigned long high = (val >> 32UL);
+	unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
+
+	__asm__ __volatile__("stxa	%3, [%0] %4\n\t"
+			     "sub	%0, 0x8, %0\n\t"
+			     "stxa	%2, [%0] %4"
+			     : "=&r" (addr)
+			     : "0" (addr), "r" (low), "r" (high),
+			       "i" (ASI_PHYS_BYPASS_EC_E));
+}
+
+static void hbtick_init_tick(unsigned long offset)
+{
+	unsigned long val;
+
+	tick_disable_protection();
+
+	/* XXX This seems to be necessary to 'jumpstart' Hummingbird
+	 * XXX into actually sending STICK interrupts.  I think because
+	 * XXX of how we store %tick_cmpr in head.S this somehow resets the
+	 * XXX {TICK + STICK} interrupt mux.  -DaveM
+	 */
+	__hbird_write_stick(__hbird_read_stick());
+
+	val = __hbird_read_stick() & ~TICK_PRIV_BIT;
+	__hbird_write_compare(val + offset);
+}
+
+static unsigned long hbtick_get_tick(void)
+{
+	return __hbird_read_stick() & ~TICK_PRIV_BIT;
+}
+
+static unsigned long hbtick_get_compare(void)
+{
+	return __hbird_read_compare();
+}
+
+static unsigned long hbtick_add_tick(unsigned long adj, unsigned long offset)
+{
+	unsigned long val;
+
+	val = __hbird_read_stick() + adj;
+	__hbird_write_stick(val);
+
+	val &= ~TICK_PRIV_BIT;
+	__hbird_write_compare(val + offset);
+
+	return val;
+}
+
+static unsigned long hbtick_add_compare(unsigned long adj)
+{
+	unsigned long val = __hbird_read_compare() + adj;
+
+	val &= ~TICK_PRIV_BIT;
+	__hbird_write_compare(val);
+
+	return val;
+}
+
+static struct sparc64_tick_ops hbtick_operations = {
+	.init_tick	=	hbtick_init_tick,
+	.get_tick	=	hbtick_get_tick,
+	.get_compare	=	hbtick_get_compare,
+	.add_tick	=	hbtick_add_tick,
+	.add_compare	=	hbtick_add_compare,
+	.softint_mask	=	1UL << 0,
+};
+
+/* timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "do_timer()" routine every clocktick
+ *
+ * NOTE: On SUN5 systems the ticker interrupt comes in using 2
+ *       interrupts, one at level14 and one with softint bit 0.
+ */
+unsigned long timer_tick_offset;
+unsigned long timer_tick_compare;
+
+static unsigned long timer_ticks_per_nsec_quotient;
+
+#define TICK_SIZE (tick_nsec / 1000)
+
+static inline void timer_check_rtc(void)
+{
+	/* last time the cmos clock got updated */
+	static long last_rtc_update;
+
+	/* Determine when to update the Mostek clock. */
+	if ((time_status & STA_UNSYNC) == 0 &&
+	    xtime.tv_sec > last_rtc_update + 660 &&
+	    (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
+	    (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
+		if (set_rtc_mmss(xtime.tv_sec) == 0)
+			last_rtc_update = xtime.tv_sec;
+		else
+			last_rtc_update = xtime.tv_sec - 600;
+			/* do it again in 60 s */
+	}
+}
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+	unsigned long ticks, pstate;
+
+	write_seqlock(&xtime_lock);
+
+	do {
+#ifndef CONFIG_SMP
+		profile_tick(CPU_PROFILING, regs);
+		update_process_times(user_mode(regs));
+#endif
+		do_timer(regs);
+
+		/* Guarantee that the following sequences execute
+		 * uninterrupted.
+		 */
+		__asm__ __volatile__("rdpr	%%pstate, %0\n\t"
+				     "wrpr	%0, %1, %%pstate"
+				     : "=r" (pstate)
+				     : "i" (PSTATE_IE));
+
+		timer_tick_compare = tick_ops->add_compare(timer_tick_offset);
+		ticks = tick_ops->get_tick();
+
+		/* Restore PSTATE_IE. */
+		__asm__ __volatile__("wrpr	%0, 0x0, %%pstate"
+				     : /* no outputs */
+				     : "r" (pstate));
+	} while (time_after_eq(ticks, timer_tick_compare));
+
+	timer_check_rtc();
+
+	write_sequnlock(&xtime_lock);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_SMP
+void timer_tick_interrupt(struct pt_regs *regs)
+{
+	write_seqlock(&xtime_lock);
+
+	do_timer(regs);
+
+	/*
+	 * Only keep timer_tick_offset uptodate, but don't set TICK_CMPR.
+	 */
+	timer_tick_compare = tick_ops->get_compare() + timer_tick_offset;
+
+	timer_check_rtc();
+
+	write_sequnlock(&xtime_lock);
+}
+#endif
+
+/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
+static void __init kick_start_clock(void)
+{
+	unsigned long regs = mstk48t02_regs;
+	u8 sec, tmp;
+	int i, count;
+
+	prom_printf("CLOCK: Clock was stopped. Kick start ");
+
+	spin_lock_irq(&mostek_lock);
+
+	/* Turn on the kick start bit to start the oscillator. */
+	tmp = mostek_read(regs + MOSTEK_CREG);
+	tmp |= MSTK_CREG_WRITE;
+	mostek_write(regs + MOSTEK_CREG, tmp);
+	tmp = mostek_read(regs + MOSTEK_SEC);
+	tmp &= ~MSTK_STOP;
+	mostek_write(regs + MOSTEK_SEC, tmp);
+	tmp = mostek_read(regs + MOSTEK_HOUR);
+	tmp |= MSTK_KICK_START;
+	mostek_write(regs + MOSTEK_HOUR, tmp);
+	tmp = mostek_read(regs + MOSTEK_CREG);
+	tmp &= ~MSTK_CREG_WRITE;
+	mostek_write(regs + MOSTEK_CREG, tmp);
+
+	spin_unlock_irq(&mostek_lock);
+
+	/* Delay to allow the clock oscillator to start. */
+	sec = MSTK_REG_SEC(regs);
+	for (i = 0; i < 3; i++) {
+		while (sec == MSTK_REG_SEC(regs))
+			for (count = 0; count < 100000; count++)
+				/* nothing */ ;
+		prom_printf(".");
+		sec = MSTK_REG_SEC(regs);
+	}
+	prom_printf("\n");
+
+	spin_lock_irq(&mostek_lock);
+
+	/* Turn off kick start and set a "valid" time and date. */
+	tmp = mostek_read(regs + MOSTEK_CREG);
+	tmp |= MSTK_CREG_WRITE;
+	mostek_write(regs + MOSTEK_CREG, tmp);
+	tmp = mostek_read(regs + MOSTEK_HOUR);
+	tmp &= ~MSTK_KICK_START;
+	mostek_write(regs + MOSTEK_HOUR, tmp);
+	MSTK_SET_REG_SEC(regs,0);
+	MSTK_SET_REG_MIN(regs,0);
+	MSTK_SET_REG_HOUR(regs,0);
+	MSTK_SET_REG_DOW(regs,5);
+	MSTK_SET_REG_DOM(regs,1);
+	MSTK_SET_REG_MONTH(regs,8);
+	MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
+	tmp = mostek_read(regs + MOSTEK_CREG);
+	tmp &= ~MSTK_CREG_WRITE;
+	mostek_write(regs + MOSTEK_CREG, tmp);
+
+	spin_unlock_irq(&mostek_lock);
+
+	/* Ensure the kick start bit is off. If it isn't, turn it off. */
+	while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
+		prom_printf("CLOCK: Kick start still on!\n");
+
+		spin_lock_irq(&mostek_lock);
+
+		tmp = mostek_read(regs + MOSTEK_CREG);
+		tmp |= MSTK_CREG_WRITE;
+		mostek_write(regs + MOSTEK_CREG, tmp);
+
+		tmp = mostek_read(regs + MOSTEK_HOUR);
+		tmp &= ~MSTK_KICK_START;
+		mostek_write(regs + MOSTEK_HOUR, tmp);
+
+		tmp = mostek_read(regs + MOSTEK_CREG);
+		tmp &= ~MSTK_CREG_WRITE;
+		mostek_write(regs + MOSTEK_CREG, tmp);
+
+		spin_unlock_irq(&mostek_lock);
+	}
+
+	prom_printf("CLOCK: Kick start procedure successful.\n");
+}
+
+/* Return nonzero if the clock chip battery is low. */
+static int __init has_low_battery(void)
+{
+	unsigned long regs = mstk48t02_regs;
+	u8 data1, data2;
+
+	spin_lock_irq(&mostek_lock);
+
+	data1 = mostek_read(regs + MOSTEK_EEPROM);	/* Read some data. */
+	mostek_write(regs + MOSTEK_EEPROM, ~data1);	/* Write back the complement. */
+	data2 = mostek_read(regs + MOSTEK_EEPROM);	/* Read back the complement. */
+	mostek_write(regs + MOSTEK_EEPROM, data1);	/* Restore original value. */
+
+	spin_unlock_irq(&mostek_lock);
+
+	return (data1 == data2);	/* Was the write blocked? */
+}
+
+/* Probe for the real time clock chip. */
+static void __init set_system_time(void)
+{
+	unsigned int year, mon, day, hour, min, sec;
+	unsigned long mregs = mstk48t02_regs;
+#ifdef CONFIG_PCI
+	unsigned long dregs = ds1287_regs;
+#else
+	unsigned long dregs = 0UL;
+#endif
+	u8 tmp;
+
+	if (!mregs && !dregs) {
+		prom_printf("Something wrong, clock regs not mapped yet.\n");
+		prom_halt();
+	}		
+
+	if (mregs) {
+		spin_lock_irq(&mostek_lock);
+
+		/* Traditional Mostek chip. */
+		tmp = mostek_read(mregs + MOSTEK_CREG);
+		tmp |= MSTK_CREG_READ;
+		mostek_write(mregs + MOSTEK_CREG, tmp);
+
+		sec = MSTK_REG_SEC(mregs);
+		min = MSTK_REG_MIN(mregs);
+		hour = MSTK_REG_HOUR(mregs);
+		day = MSTK_REG_DOM(mregs);
+		mon = MSTK_REG_MONTH(mregs);
+		year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
+	} else {
+		int i;
+
+		/* Dallas 12887 RTC chip. */
+
+		/* Stolen from arch/i386/kernel/time.c, see there for
+		 * credits and descriptive comments.
+		 */
+		for (i = 0; i < 1000000; i++) {
+			if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
+				break;
+			udelay(10);
+		}
+		for (i = 0; i < 1000000; i++) {
+			if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
+				break;
+			udelay(10);
+		}
+		do {
+			sec  = CMOS_READ(RTC_SECONDS);
+			min  = CMOS_READ(RTC_MINUTES);
+			hour = CMOS_READ(RTC_HOURS);
+			day  = CMOS_READ(RTC_DAY_OF_MONTH);
+			mon  = CMOS_READ(RTC_MONTH);
+			year = CMOS_READ(RTC_YEAR);
+		} while (sec != CMOS_READ(RTC_SECONDS));
+		if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+			BCD_TO_BIN(sec);
+			BCD_TO_BIN(min);
+			BCD_TO_BIN(hour);
+			BCD_TO_BIN(day);
+			BCD_TO_BIN(mon);
+			BCD_TO_BIN(year);
+		}
+		if ((year += 1900) < 1970)
+			year += 100;
+	}
+
+	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
+	xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
+	set_normalized_timespec(&wall_to_monotonic,
+ 	                        -xtime.tv_sec, -xtime.tv_nsec);
+
+	if (mregs) {
+		tmp = mostek_read(mregs + MOSTEK_CREG);
+		tmp &= ~MSTK_CREG_READ;
+		mostek_write(mregs + MOSTEK_CREG, tmp);
+
+		spin_unlock_irq(&mostek_lock);
+	}
+}
+
+void __init clock_probe(void)
+{
+	struct linux_prom_registers clk_reg[2];
+	char model[128];
+	int node, busnd = -1, err;
+	unsigned long flags;
+	struct linux_central *cbus;
+#ifdef CONFIG_PCI
+	struct linux_ebus *ebus = NULL;
+	struct sparc_isa_bridge *isa_br = NULL;
+#endif
+	static int invoked;
+
+	if (invoked)
+		return;
+	invoked = 1;
+
+
+	if (this_is_starfire) {
+		/* davem suggests we keep this within the 4M locked kernel image */
+		static char obp_gettod[256];
+		static u32 unix_tod;
+
+		sprintf(obp_gettod, "h# %08x unix-gettod",
+			(unsigned int) (long) &unix_tod);
+		prom_feval(obp_gettod);
+		xtime.tv_sec = unix_tod;
+		xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
+		set_normalized_timespec(&wall_to_monotonic,
+		                        -xtime.tv_sec, -xtime.tv_nsec);
+		return;
+	}
+
+	local_irq_save(flags);
+
+	cbus = central_bus;
+	if (cbus != NULL)
+		busnd = central_bus->child->prom_node;
+
+	/* Check FHC Central then EBUSs then ISA bridges then SBUSs.
+	 * That way we handle the presence of multiple properly.
+	 *
+	 * As a special case, machines with Central must provide the
+	 * timer chip there.
+	 */
+#ifdef CONFIG_PCI
+	if (ebus_chain != NULL) {
+		ebus = ebus_chain;
+		if (busnd == -1)
+			busnd = ebus->prom_node;
+	}
+	if (isa_chain != NULL) {
+		isa_br = isa_chain;
+		if (busnd == -1)
+			busnd = isa_br->prom_node;
+	}
+#endif
+	if (sbus_root != NULL && busnd == -1)
+		busnd = sbus_root->prom_node;
+
+	if (busnd == -1) {
+		prom_printf("clock_probe: problem, cannot find bus to search.\n");
+		prom_halt();
+	}
+
+	node = prom_getchild(busnd);
+
+	while (1) {
+		if (!node)
+			model[0] = 0;
+		else
+			prom_getstring(node, "model", model, sizeof(model));
+		if (strcmp(model, "mk48t02") &&
+		    strcmp(model, "mk48t08") &&
+		    strcmp(model, "mk48t59") &&
+		    strcmp(model, "m5819") &&
+		    strcmp(model, "m5819p") &&
+		    strcmp(model, "m5823") &&
+		    strcmp(model, "ds1287")) {
+			if (cbus != NULL) {
+				prom_printf("clock_probe: Central bus lacks timer chip.\n");
+				prom_halt();
+			}
+
+		   	if (node != 0)
+				node = prom_getsibling(node);
+#ifdef CONFIG_PCI
+			while ((node == 0) && ebus != NULL) {
+				ebus = ebus->next;
+				if (ebus != NULL) {
+					busnd = ebus->prom_node;
+					node = prom_getchild(busnd);
+				}
+			}
+			while ((node == 0) && isa_br != NULL) {
+				isa_br = isa_br->next;
+				if (isa_br != NULL) {
+					busnd = isa_br->prom_node;
+					node = prom_getchild(busnd);
+				}
+			}
+#endif
+			if (node == 0) {
+				prom_printf("clock_probe: Cannot find timer chip\n");
+				prom_halt();
+			}
+			continue;
+		}
+
+		err = prom_getproperty(node, "reg", (char *)clk_reg,
+				       sizeof(clk_reg));
+		if(err == -1) {
+			prom_printf("clock_probe: Cannot get Mostek reg property\n");
+			prom_halt();
+		}
+
+		if (cbus != NULL) {
+			apply_fhc_ranges(central_bus->child, clk_reg, 1);
+			apply_central_ranges(central_bus, clk_reg, 1);
+		}
+#ifdef CONFIG_PCI
+		else if (ebus != NULL) {
+			struct linux_ebus_device *edev;
+
+			for_each_ebusdev(edev, ebus)
+				if (edev->prom_node == node)
+					break;
+			if (edev == NULL) {
+				if (isa_chain != NULL)
+					goto try_isa_clock;
+				prom_printf("%s: Mostek not probed by EBUS\n",
+					    __FUNCTION__);
+				prom_halt();
+			}
+
+			if (!strcmp(model, "ds1287") ||
+			    !strcmp(model, "m5819") ||
+			    !strcmp(model, "m5819p") ||
+			    !strcmp(model, "m5823")) {
+				ds1287_regs = edev->resource[0].start;
+			} else {
+				mstk48t59_regs = edev->resource[0].start;
+				mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
+			}
+			break;
+		}
+		else if (isa_br != NULL) {
+			struct sparc_isa_device *isadev;
+
+try_isa_clock:
+			for_each_isadev(isadev, isa_br)
+				if (isadev->prom_node == node)
+					break;
+			if (isadev == NULL) {
+				prom_printf("%s: Mostek not probed by ISA\n");
+				prom_halt();
+			}
+			if (!strcmp(model, "ds1287") ||
+			    !strcmp(model, "m5819") ||
+			    !strcmp(model, "m5819p") ||
+			    !strcmp(model, "m5823")) {
+				ds1287_regs = isadev->resource.start;
+			} else {
+				mstk48t59_regs = isadev->resource.start;
+				mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
+			}
+			break;
+		}
+#endif
+		else {
+			if (sbus_root->num_sbus_ranges) {
+				int nranges = sbus_root->num_sbus_ranges;
+				int rngc;
+
+				for (rngc = 0; rngc < nranges; rngc++)
+					if (clk_reg[0].which_io ==
+					    sbus_root->sbus_ranges[rngc].ot_child_space)
+						break;
+				if (rngc == nranges) {
+					prom_printf("clock_probe: Cannot find ranges for "
+						    "clock regs.\n");
+					prom_halt();
+				}
+				clk_reg[0].which_io =
+					sbus_root->sbus_ranges[rngc].ot_parent_space;
+				clk_reg[0].phys_addr +=
+					sbus_root->sbus_ranges[rngc].ot_parent_base;
+			}
+		}
+
+		if(model[5] == '0' && model[6] == '2') {
+			mstk48t02_regs = (((u64)clk_reg[0].phys_addr) |
+					  (((u64)clk_reg[0].which_io)<<32UL));
+		} else if(model[5] == '0' && model[6] == '8') {
+			mstk48t08_regs = (((u64)clk_reg[0].phys_addr) |
+					  (((u64)clk_reg[0].which_io)<<32UL));
+			mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
+		} else {
+			mstk48t59_regs = (((u64)clk_reg[0].phys_addr) |
+					  (((u64)clk_reg[0].which_io)<<32UL));
+			mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
+		}
+		break;
+	}
+
+	if (mstk48t02_regs != 0UL) {
+		/* Report a low battery voltage condition. */
+		if (has_low_battery())
+			prom_printf("NVRAM: Low battery voltage!\n");
+
+		/* Kick start the clock if it is completely stopped. */
+		if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
+			kick_start_clock();
+	}
+
+	set_system_time();
+	
+	local_irq_restore(flags);
+}
+
+/* This is gets the master TICK_INT timer going. */
+static unsigned long sparc64_init_timers(void)
+{
+	unsigned long clock;
+	int node;
+#ifdef CONFIG_SMP
+	extern void smp_tick_init(void);
+#endif
+
+	if (tlb_type == spitfire) {
+		unsigned long ver, manuf, impl;
+
+		__asm__ __volatile__ ("rdpr %%ver, %0"
+				      : "=&r" (ver));
+		manuf = ((ver >> 48) & 0xffff);
+		impl = ((ver >> 32) & 0xffff);
+		if (manuf == 0x17 && impl == 0x13) {
+			/* Hummingbird, aka Ultra-IIe */
+			tick_ops = &hbtick_operations;
+			node = prom_root_node;
+			clock = prom_getint(node, "stick-frequency");
+		} else {
+			tick_ops = &tick_operations;
+			cpu_find_by_instance(0, &node, NULL);
+			clock = prom_getint(node, "clock-frequency");
+		}
+	} else {
+		tick_ops = &stick_operations;
+		node = prom_root_node;
+		clock = prom_getint(node, "stick-frequency");
+	}
+	timer_tick_offset = clock / HZ;
+
+#ifdef CONFIG_SMP
+	smp_tick_init();
+#endif
+
+	return clock;
+}
+
+static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_regs *))
+{
+	unsigned long pstate;
+	int err;
+
+	/* Register IRQ handler. */
+	err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, SA_STATIC_ALLOC,
+			  "timer", NULL);
+
+	if (err) {
+		prom_printf("Serious problem, cannot register TICK_INT\n");
+		prom_halt();
+	}
+
+	/* Guarantee that the following sequences execute
+	 * uninterrupted.
+	 */
+	__asm__ __volatile__("rdpr	%%pstate, %0\n\t"
+			     "wrpr	%0, %1, %%pstate"
+			     : "=r" (pstate)
+			     : "i" (PSTATE_IE));
+
+	tick_ops->init_tick(timer_tick_offset);
+
+	/* Restore PSTATE_IE. */
+	__asm__ __volatile__("wrpr	%0, 0x0, %%pstate"
+			     : /* no outputs */
+			     : "r" (pstate));
+
+	local_irq_enable();
+}
+
+struct freq_table {
+	unsigned long udelay_val_ref;
+	unsigned long clock_tick_ref;
+	unsigned int ref_freq;
+};
+static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0, 0 };
+
+unsigned long sparc64_get_clock_tick(unsigned int cpu)
+{
+	struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
+
+	if (ft->clock_tick_ref)
+		return ft->clock_tick_ref;
+	return cpu_data(cpu).clock_tick;
+}
+
+#ifdef CONFIG_CPU_FREQ
+
+static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+				    void *data)
+{
+	struct cpufreq_freqs *freq = data;
+	unsigned int cpu = freq->cpu;
+	struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
+
+	if (!ft->ref_freq) {
+		ft->ref_freq = freq->old;
+		ft->udelay_val_ref = cpu_data(cpu).udelay_val;
+		ft->clock_tick_ref = cpu_data(cpu).clock_tick;
+	}
+	if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
+	    (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
+	    (val == CPUFREQ_RESUMECHANGE)) {
+		cpu_data(cpu).udelay_val =
+			cpufreq_scale(ft->udelay_val_ref,
+				      ft->ref_freq,
+				      freq->new);
+		cpu_data(cpu).clock_tick =
+			cpufreq_scale(ft->clock_tick_ref,
+				      ft->ref_freq,
+				      freq->new);
+	}
+
+	return 0;
+}
+
+static struct notifier_block sparc64_cpufreq_notifier_block = {
+	.notifier_call	= sparc64_cpufreq_notifier
+};
+
+#endif /* CONFIG_CPU_FREQ */
+
+static struct time_interpolator sparc64_cpu_interpolator = {
+	.source		=	TIME_SOURCE_CPU,
+	.shift		=	16,
+	.mask		=	0xffffffffffffffffLL
+};
+
+/* The quotient formula is taken from the IA64 port. */
+#define SPARC64_NSEC_PER_CYC_SHIFT	30UL
+void __init time_init(void)
+{
+	unsigned long clock = sparc64_init_timers();
+
+	sparc64_cpu_interpolator.frequency = clock;
+	register_time_interpolator(&sparc64_cpu_interpolator);
+
+	/* Now that the interpolator is registered, it is
+	 * safe to start the timer ticking.
+	 */
+	sparc64_start_timers(timer_interrupt);
+
+	timer_ticks_per_nsec_quotient =
+		(((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) +
+		  (clock / 2)) / clock);
+
+#ifdef CONFIG_CPU_FREQ
+	cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
+				  CPUFREQ_TRANSITION_NOTIFIER);
+#endif
+}
+
+unsigned long long sched_clock(void)
+{
+	unsigned long ticks = tick_ops->get_tick();
+
+	return (ticks * timer_ticks_per_nsec_quotient)
+		>> SPARC64_NSEC_PER_CYC_SHIFT;
+}
+
+static int set_rtc_mmss(unsigned long nowtime)
+{
+	int real_seconds, real_minutes, chip_minutes;
+	unsigned long mregs = mstk48t02_regs;
+#ifdef CONFIG_PCI
+	unsigned long dregs = ds1287_regs;
+#else
+	unsigned long dregs = 0UL;
+#endif
+	unsigned long flags;
+	u8 tmp;
+
+	/* 
+	 * Not having a register set can lead to trouble.
+	 * Also starfire doesn't have a tod clock.
+	 */
+	if (!mregs && !dregs) 
+		return -1;
+
+	if (mregs) {
+		spin_lock_irqsave(&mostek_lock, flags);
+
+		/* Read the current RTC minutes. */
+		tmp = mostek_read(mregs + MOSTEK_CREG);
+		tmp |= MSTK_CREG_READ;
+		mostek_write(mregs + MOSTEK_CREG, tmp);
+
+		chip_minutes = MSTK_REG_MIN(mregs);
+
+		tmp = mostek_read(mregs + MOSTEK_CREG);
+		tmp &= ~MSTK_CREG_READ;
+		mostek_write(mregs + MOSTEK_CREG, tmp);
+
+		/*
+		 * 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 - chip_minutes) + 15)/30) & 1)
+			real_minutes += 30;	/* correct for half hour time zone */
+		real_minutes %= 60;
+
+		if (abs(real_minutes - chip_minutes) < 30) {
+			tmp = mostek_read(mregs + MOSTEK_CREG);
+			tmp |= MSTK_CREG_WRITE;
+			mostek_write(mregs + MOSTEK_CREG, tmp);
+
+			MSTK_SET_REG_SEC(mregs,real_seconds);
+			MSTK_SET_REG_MIN(mregs,real_minutes);
+
+			tmp = mostek_read(mregs + MOSTEK_CREG);
+			tmp &= ~MSTK_CREG_WRITE;
+			mostek_write(mregs + MOSTEK_CREG, tmp);
+
+			spin_unlock_irqrestore(&mostek_lock, flags);
+
+			return 0;
+		} else {
+			spin_unlock_irqrestore(&mostek_lock, flags);
+
+			return -1;
+		}
+	} else {
+		int retval = 0;
+		unsigned char save_control, save_freq_select;
+
+		/* Stolen from arch/i386/kernel/time.c, see there for
+		 * credits and descriptive comments.
+		 */
+		spin_lock_irqsave(&rtc_lock, flags);
+		save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
+		CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
+
+		save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
+		CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+		chip_minutes = CMOS_READ(RTC_MINUTES);
+		if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+			BCD_TO_BIN(chip_minutes);
+		real_seconds = nowtime % 60;
+		real_minutes = nowtime / 60;
+		if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
+			real_minutes += 30;
+		real_minutes %= 60;
+
+		if (abs(real_minutes - chip_minutes) < 30) {
+			if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+				BIN_TO_BCD(real_seconds);
+				BIN_TO_BCD(real_minutes);
+			}
+			CMOS_WRITE(real_seconds,RTC_SECONDS);
+			CMOS_WRITE(real_minutes,RTC_MINUTES);
+		} else {
+			printk(KERN_WARNING
+			       "set_rtc_mmss: can't update from %d to %d\n",
+			       chip_minutes, real_minutes);
+			retval = -1;
+		}
+
+		CMOS_WRITE(save_control, RTC_CONTROL);
+		CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+		spin_unlock_irqrestore(&rtc_lock, flags);
+
+		return retval;
+	}
+}