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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-01-05 18:09:03 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-01-05 18:09:03 +0000
commit58daf18cdcab550262a5f4681e1f1e073e21965a (patch)
tree2096324b947761a567dd451f33664f17ee1de2cd /arch/arm/plat-omap
parentaa312be1987d43216e72ffce42bccf6bf81f62ed (diff)
parent0af85dda39d9b673aca8c0ebae004ea70f3efc93 (diff)
downloadlinux-linaro-58daf18cdcab550262a5f4681e1f1e073e21965a.tar.gz
Merge branch 'clksrc' into devel
Conflicts: arch/arm/mach-vexpress/v2m.c arch/arm/plat-omap/counter_32k.c arch/arm/plat-versatile/Makefile
Diffstat (limited to 'arch/arm/plat-omap')
-rw-r--r--arch/arm/plat-omap/counter_32k.c47
1 files changed, 32 insertions, 15 deletions
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index 8722a136f3a..ea4644021fb 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -15,8 +15,11 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
-#include <linux/io.h>
#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+
+#include <asm/sched_clock.h>
#include <plat/common.h>
#include <plat/board.h>
@@ -45,7 +48,7 @@
static u32 offset_32k __read_mostly;
#ifdef CONFIG_ARCH_OMAP16XX
-static cycle_t omap16xx_32k_read(struct clocksource *cs)
+static cycle_t notrace omap16xx_32k_read(struct clocksource *cs)
{
return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED) - offset_32k;
}
@@ -54,7 +57,7 @@ static cycle_t omap16xx_32k_read(struct clocksource *cs)
#endif
#ifdef CONFIG_ARCH_OMAP2420
-static cycle_t omap2420_32k_read(struct clocksource *cs)
+static cycle_t notrace omap2420_32k_read(struct clocksource *cs)
{
return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10) - offset_32k;
}
@@ -63,7 +66,7 @@ static cycle_t omap2420_32k_read(struct clocksource *cs)
#endif
#ifdef CONFIG_ARCH_OMAP2430
-static cycle_t omap2430_32k_read(struct clocksource *cs)
+static cycle_t notrace omap2430_32k_read(struct clocksource *cs)
{
return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10) - offset_32k;
}
@@ -72,7 +75,7 @@ static cycle_t omap2430_32k_read(struct clocksource *cs)
#endif
#ifdef CONFIG_ARCH_OMAP3
-static cycle_t omap34xx_32k_read(struct clocksource *cs)
+static cycle_t notrace omap34xx_32k_read(struct clocksource *cs)
{
return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10) - offset_32k;
}
@@ -81,7 +84,7 @@ static cycle_t omap34xx_32k_read(struct clocksource *cs)
#endif
#ifdef CONFIG_ARCH_OMAP4
-static cycle_t omap44xx_32k_read(struct clocksource *cs)
+static cycle_t notrace omap44xx_32k_read(struct clocksource *cs)
{
return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10) - offset_32k;
}
@@ -93,7 +96,7 @@ static cycle_t omap44xx_32k_read(struct clocksource *cs)
* Kernel assumes that sched_clock can be called early but may not have
* things ready yet.
*/
-static cycle_t omap_32k_read_dummy(struct clocksource *cs)
+static cycle_t notrace omap_32k_read_dummy(struct clocksource *cs)
{
return 0;
}
@@ -103,7 +106,6 @@ static struct clocksource clocksource_32k = {
.rating = 250,
.read = omap_32k_read_dummy,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 10,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -111,10 +113,25 @@ static struct clocksource clocksource_32k = {
* Returns current time from boot in nsecs. It's OK for this to wrap
* around for now, as it's just a relative time stamp.
*/
-unsigned long long sched_clock(void)
+static DEFINE_CLOCK_DATA(cd);
+
+/*
+ * Constants generated by clocks_calc_mult_shift(m, s, 32768, NSEC_PER_SEC, 60).
+ * This gives a resolution of about 30us and a wrap period of about 36hrs.
+ */
+#define SC_MULT 4000000000u
+#define SC_SHIFT 17
+
+unsigned long long notrace sched_clock(void)
+{
+ u32 cyc = clocksource_32k.read(&clocksource_32k);
+ return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
+}
+
+static void notrace omap_update_sched_clock(void)
{
- return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
- clocksource_32k.mult, clocksource_32k.shift);
+ u32 cyc = clocksource_32k.read(&clocksource_32k);
+ update_sched_clock(&cd, cyc, (u32)~0);
}
/**
@@ -168,13 +185,13 @@ static int __init omap_init_clocksource_32k(void)
if (!IS_ERR(sync_32k_ick))
clk_enable(sync_32k_ick);
- clocksource_32k.mult = clocksource_hz2mult(32768,
- clocksource_32k.shift);
-
offset_32k = clocksource_32k.read(&clocksource_32k);
- if (clocksource_register(&clocksource_32k))
+ if (clocksource_register_hz(&clocksource_32k, 32768))
printk(err, clocksource_32k.name);
+
+ init_fixed_sched_clock(&cd, omap_update_sched_clock, 32,
+ 32768, SC_MULT, SC_SHIFT);
}
return 0;
}