ARM: tegra: convert sched_clock() to use new infrastructure

Convert tegra to use the new sched_clock() infrastructure for extending
32bit counters to full 64-bit nanoseconds.

Tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 21 insertions, 2 deletions

diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c
index c52bd84652e5..7b8ad1f98f44 100644
--- a/arch/arm/mach-tegra/timer.c
+++ b/arch/arm/mach-tegra/timer.c
@@ -26,10 +26,10 @@
 #include <linux/clocksource.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/cnt32_to_63.h>
 
 #include <asm/mach/time.h>
 #include <asm/localtimer.h>
+#include <asm/sched_clock.h>
 
 #include <mach/iomap.h>
 #include <mach/irqs.h>
@@ -111,9 +111,25 @@ static struct clocksource tegra_clocksource = {
         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
+static DEFINE_CLOCK_DATA(cd);
+
+/*
+ * Constants generated by clocks_calc_mult_shift(m, s, 1MHz, NSEC_PER_SEC, 60).
+ * This gives a resolution of about 1us and a wrap period of about 1h11min.
+ */
+#define SC_MULT         4194304000u
+#define SC_SHIFT        22
+
 unsigned long long notrace sched_clock(void)
 {
-        return cnt32_to_63(timer_readl(TIMERUS_CNTR_1US)) * 1000;
+        u32 cyc = timer_readl(TIMERUS_CNTR_1US);
+        return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
+}
+
+static void notrace tegra_update_sched_clock(void)
+{
+        u32 cyc = timer_readl(TIMERUS_CNTR_1US);
+        update_sched_clock(&cd, cyc, (u32)~0);
 }
 
 static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id)
@@ -158,6 +174,9 @@ static void __init tegra_init_timer(void)
                 WARN(1, "Unknown clock rate");
         }
 
+        init_fixed_sched_clock(&cd, tegra_update_sched_clock, 32,
+                               1000000, SC_MULT, SC_SHIFT);
+
         if (clocksource_register_hz(&tegra_clocksource, 1000000)) {
                 printk(KERN_ERR "Failed to register clocksource\n");
                 BUG();