5 files changed, 36 insertions, 184 deletions

diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index 5cf88e8427b..16dde081993 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -1,7 +1,7 @@
 obj-y	:= clock.o
-obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o
-obj-$(CONFIG_ARCH_REALVIEW) += sched-clock.o
-obj-$(CONFIG_ARCH_VERSATILE) += sched-clock.o
+ifneq ($(CONFIG_ARCH_INTEGRATOR),y)
+obj-y	+= sched-clock.o
+endif
 ifeq ($(CONFIG_LEDS_CLASS),y)
 obj-$(CONFIG_ARCH_REALVIEW) += leds.o
 obj-$(CONFIG_ARCH_VERSATILE) += leds.o
diff --git a/arch/arm/plat-versatile/include/plat/sched_clock.h b/arch/arm/plat-versatile/include/plat/sched_clock.h
new file mode 100644
index 00000000000..5c3e4fc9fa0
--- /dev/null
+++ b/arch/arm/plat-versatile/include/plat/sched_clock.h
@@ -0,0 +1,6 @@
+#ifndef ARM_PLAT_SCHED_CLOCK_H
+#define ARM_PLAT_SCHED_CLOCK_H
+
+void versatile_sched_clock_init(void __iomem *, unsigned long);
+
+#endif
diff --git a/arch/arm/plat-versatile/include/plat/timer-sp.h b/arch/arm/plat-versatile/include/plat/timer-sp.h
deleted file mode 100644
index 21e75e30d49..00000000000
--- a/arch/arm/plat-versatile/include/plat/timer-sp.h
+++ /dev/null
@@ -1,2 +0,0 @@
-void sp804_clocksource_init(void __iomem *);
-void sp804_clockevents_init(void __iomem *, unsigned int);
diff --git a/arch/arm/plat-versatile/sched-clock.c b/arch/arm/plat-versatile/sched-clock.c
index 9696ddc238c..3d6a4c292ca 100644
--- a/arch/arm/plat-versatile/sched-clock.c
+++ b/arch/arm/plat-versatile/sched-clock.c
@@ -18,37 +18,41 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-#include <linux/cnt32_to_63.h>
 #include <linux/io.h>
 #include <linux/sched.h>
-#include <asm/div64.h>
 
-#include <mach/hardware.h>
-#include <mach/platform.h>
+#include <asm/sched_clock.h>
+#include <plat/sched_clock.h>
 
-#ifdef VERSATILE_SYS_BASE
-#define REFCOUNTER	(__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_24MHz_OFFSET)
-#endif
-
-#ifdef REALVIEW_SYS_BASE
-#define REFCOUNTER	(__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
-#endif
+static DEFINE_CLOCK_DATA(cd);
+static void __iomem *ctr;
 
 /*
- * This is the Realview and Versatile sched_clock implementation.  This
- * has a resolution of 41.7ns, and a maximum value of about 35583 days.
- *
- * The return value is guaranteed to be monotonic in that range as
- * long as there is always less than 89 seconds between successive
- * calls to this function.
+ * Constants generated by clocks_calc_mult_shift(m, s, 24MHz, NSEC_PER_SEC, 60).
+ * This gives a resolution of about 41ns and a wrap period of about 178s.
  */
-unsigned long long sched_clock(void)
+#define SC_MULT		2796202667u
+#define SC_SHIFT	26
+
+unsigned long long notrace sched_clock(void)
 {
-	unsigned long long v = cnt32_to_63(readl(REFCOUNTER));
+	if (ctr) {
+		u32 cyc = readl(ctr);
+		return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0,
+						SC_MULT, SC_SHIFT);
+	} else
+		return 0;
+}
 
-	/* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
-	v *= 125<<1;
-	do_div(v, 3<<1);
+static void notrace versatile_update_sched_clock(void)
+{
+	u32 cyc = readl(ctr);
+	update_sched_clock(&cd, cyc, (u32)~0);
+}
 
-	return v;
+void __init versatile_sched_clock_init(void __iomem *reg, unsigned long rate)
+{
+	ctr = reg;
+	init_fixed_sched_clock(&cd, versatile_update_sched_clock,
+			       32, rate, SC_MULT, SC_SHIFT);
 }
diff --git a/arch/arm/plat-versatile/timer-sp.c b/arch/arm/plat-versatile/timer-sp.c
deleted file mode 100644
index fb0d1c29971..00000000000
--- a/arch/arm/plat-versatile/timer-sp.c
+++ /dev/null
@@ -1,156 +0,0 @@
-/*
- *  linux/arch/arm/plat-versatile/timer-sp.c
- *
- *  Copyright (C) 1999 - 2003 ARM Limited
- *  Copyright (C) 2000 Deep Blue Solutions Ltd
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-
-#include <asm/hardware/arm_timer.h>
-
-#include <plat/timer-sp.h>
-
-/*
- * These timers are currently always setup to be clocked at 1MHz.
- */
-#define TIMER_FREQ_KHZ	(1000)
-#define TIMER_RELOAD	(TIMER_FREQ_KHZ * 1000 / HZ)
-
-static void __iomem *clksrc_base;
-
-static cycle_t sp804_read(struct clocksource *cs)
-{
-	return ~readl(clksrc_base + TIMER_VALUE);
-}
-
-static struct clocksource clocksource_sp804 = {
-	.name		= "timer3",
-	.rating		= 200,
-	.read		= sp804_read,
-	.mask		= CLOCKSOURCE_MASK(32),
-	.shift		= 20,
-	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-void __init sp804_clocksource_init(void __iomem *base)
-{
-	struct clocksource *cs = &clocksource_sp804;
-
-	clksrc_base = base;
-
-	/* setup timer 0 as free-running clocksource */
-	writel(0, clksrc_base + TIMER_CTRL);
-	writel(0xffffffff, clksrc_base + TIMER_LOAD);
-	writel(0xffffffff, clksrc_base + TIMER_VALUE);
-	writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
-		clksrc_base + TIMER_CTRL);
-
-	cs->mult = clocksource_khz2mult(TIMER_FREQ_KHZ, cs->shift);
-	clocksource_register(cs);
-}
-
-
-static void __iomem *clkevt_base;
-
-/*
- * IRQ handler for the timer
- */
-static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)
-{
-	struct clock_event_device *evt = dev_id;
-
-	/* clear the interrupt */
-	writel(1, clkevt_base + TIMER_INTCLR);
-
-	evt->event_handler(evt);
-
-	return IRQ_HANDLED;
-}
-
-static void sp804_set_mode(enum clock_event_mode mode,
-	struct clock_event_device *evt)
-{
-	unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE;
-
-	writel(ctrl, clkevt_base + TIMER_CTRL);
-
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		writel(TIMER_RELOAD, clkevt_base + TIMER_LOAD);
-		ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
-		break;
-
-	case CLOCK_EVT_MODE_ONESHOT:
-		/* period set, and timer enabled in 'next_event' hook */
-		ctrl |= TIMER_CTRL_ONESHOT;
-		break;
-
-	case CLOCK_EVT_MODE_UNUSED:
-	case CLOCK_EVT_MODE_SHUTDOWN:
-	default:
-		break;
-	}
-
-	writel(ctrl, clkevt_base + TIMER_CTRL);
-}
-
-static int sp804_set_next_event(unsigned long next,
-	struct clock_event_device *evt)
-{
-	unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
-
-	writel(next, clkevt_base + TIMER_LOAD);
-	writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
-
-	return 0;
-}
-
-static struct clock_event_device sp804_clockevent = {
-	.name		= "timer0",
-	.shift		= 32,
-	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-	.set_mode	= sp804_set_mode,
-	.set_next_event	= sp804_set_next_event,
-	.rating		= 300,
-	.cpumask	= cpu_all_mask,
-};
-
-static struct irqaction sp804_timer_irq = {
-	.name		= "timer",
-	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= sp804_timer_interrupt,
-	.dev_id		= &sp804_clockevent,
-};
-
-void __init sp804_clockevents_init(void __iomem *base, unsigned int timer_irq)
-{
-	struct clock_event_device *evt = &sp804_clockevent;
-
-	clkevt_base = base;
-
-	evt->irq = timer_irq;
-	evt->mult = div_sc(TIMER_FREQ_KHZ, NSEC_PER_MSEC, evt->shift);
-	evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt);
-	evt->min_delta_ns = clockevent_delta2ns(0xf, evt);
-
-	setup_irq(timer_irq, &sp804_timer_irq);
-	clockevents_register_device(evt);
-}