X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fxtensa%2Fkernel%2Ftime.c;h=8df1e842f6d401d060d077246d97d942c2033cad;hb=133e887f90208d339088dd60cb1d08a72ba27288;hp=4a2c365ba68464d32c03a4c6aa1c10c2e5b431d4;hpb=5f765b8d68fe99c8a575265d81c62382893e1e8a;p=linux-2.6-omap-h63xx.git

diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index 4a2c365ba68..8df1e842f6d 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -26,18 +26,15 @@
 #include <asm/platform.h>
 
 
-extern volatile unsigned long wall_jiffies;
-
 DEFINE_SPINLOCK(rtc_lock);
 EXPORT_SYMBOL(rtc_lock);
 
 
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 unsigned long ccount_per_jiffy;		/* per 1/HZ */
-unsigned long ccount_nsec;		/* nsec per ccount increment */
+unsigned long nsec_per_ccount;		/* nsec per ccount increment */
 #endif
 
-unsigned int last_ccount_stamp;
 static long last_rtc_update = 0;
 
 /*
@@ -49,10 +46,10 @@ unsigned long long sched_clock(void)
 	return (unsigned long long)jiffies * (1000000000 / HZ);
 }
 
-static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static irqreturn_t timer_interrupt(int irq, void *dev_id);
 static struct irqaction timer_irqaction = {
 	.handler =	timer_interrupt,
-	.flags =	SA_INTERRUPT,
+	.flags =	IRQF_DISABLED,
 	.name =		"timer",
 };
 
@@ -80,7 +77,6 @@ void __init time_init(void)
 
 	xtime.tv_nsec = 0;
 	last_rtc_update = xtime.tv_sec = sec_n;
-	last_ccount_stamp = get_ccount();
 
 	set_normalized_timespec(&wall_to_monotonic,
 		-xtime.tv_sec, -xtime.tv_nsec);
@@ -96,7 +92,7 @@ int do_settimeofday(struct timespec *tv)
 {
 	time_t wtm_sec, sec = tv->tv_sec;
 	long wtm_nsec, nsec = tv->tv_nsec;
-	unsigned long ccount;
+	unsigned long delta;
 
 	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
 		return -EINVAL;
@@ -108,9 +104,10 @@ int do_settimeofday(struct timespec *tv)
 	 * wall time.  Discover what correction gettimeofday() would have
 	 * made, and then undo it!
 	 */
-	ccount = get_ccount();
-	nsec -= (ccount - last_ccount_stamp) * CCOUNT_NSEC;
-	nsec -= (jiffies - wall_jiffies) * CCOUNT_PER_JIFFY * CCOUNT_NSEC;
+
+	delta = CCOUNT_PER_JIFFY;
+	delta += get_ccount() - get_linux_timer();
+	nsec -= delta * NSEC_PER_CCOUNT;
 
 	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
 	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
@@ -129,20 +126,21 @@ EXPORT_SYMBOL(do_settimeofday);
 void do_gettimeofday(struct timeval *tv)
 {
 	unsigned long flags;
-	unsigned long sec, usec, delta, lost, seq;
+	unsigned long volatile sec, usec, delta, seq;
 
 	do {
 		seq = read_seqbegin_irqsave(&xtime_lock, flags);
 
-		delta = get_ccount() - last_ccount_stamp;
 		sec = xtime.tv_sec;
 		usec = (xtime.tv_nsec / NSEC_PER_USEC);
 
-		lost = jiffies - wall_jiffies;
+		delta = get_linux_timer() - get_ccount();
 
 	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
 
-	usec += lost * (1000000UL/HZ) + (delta * CCOUNT_NSEC) / NSEC_PER_USEC;
+	usec += (((unsigned long) CCOUNT_PER_JIFFY - delta)
+		 * (unsigned long) NSEC_PER_CCOUNT) / NSEC_PER_USEC;
+
 	for (; usec >= 1000000; sec++, usec -= 1000000)
 		;
 
@@ -156,7 +154,7 @@ EXPORT_SYMBOL(do_gettimeofday);
  * The timer interrupt is called HZ times per second.
  */
 
-irqreturn_t timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t timer_interrupt (int irq, void *dev_id)
 {
 
 	unsigned long next;
@@ -166,21 +164,23 @@ irqreturn_t timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
 again:
 	while ((signed long)(get_ccount() - next) > 0) {
 
-		profile_tick(CPU_PROFILING, regs);
+		profile_tick(CPU_PROFILING);
 #ifndef CONFIG_SMP
-		update_process_times(user_mode(regs));
+		update_process_times(user_mode(get_irq_regs()));
 #endif
 
 		write_seqlock(&xtime_lock);
 
-		last_ccount_stamp = next;
+		do_timer(1); /* Linux handler in kernel/timer.c */
+
+		/* Note that writing CCOMPARE clears the interrupt. */
+
 		next += CCOUNT_PER_JIFFY;
-		do_timer (regs); /* Linux handler in kernel/timer.c */
+		set_linux_timer(next);
 
 		if (ntp_synced() &&
 		    xtime.tv_sec - last_rtc_update >= 659 &&
-		    abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ &&
-		    jiffies - wall_jiffies == 1) {
+		    abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ) {
 
 			if (platform_set_rtc_time(xtime.tv_sec+1) == 0)
 				last_rtc_update = xtime.tv_sec+1;
@@ -191,24 +191,20 @@ again:
 		write_sequnlock(&xtime_lock);
 	}
 
-	/* NOTE: writing CCOMPAREn clears the interrupt.  */
+	/* Allow platform to do something useful (Wdog). */
 
-	set_linux_timer (next);
+	platform_heartbeat();
 
 	/* Make sure we didn't miss any tick... */
 
 	if ((signed long)(get_ccount() - next) > 0)
 		goto again;
 
-	/* Allow platform to do something useful (Wdog). */
-
-	platform_heartbeat();
-
 	return IRQ_HANDLED;
 }
 
 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
-void __devinit calibrate_delay(void)
+void __cpuinit calibrate_delay(void)
 {
 	loops_per_jiffy = CCOUNT_PER_JIFFY;
 	printk("Calibrating delay loop (skipped)... "