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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-versatile
parentaa312be1987d43216e72ffce42bccf6bf81f62ed (diff)
parent0af85dda39d9b673aca8c0ebae004ea70f3efc93 (diff)
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-versatile')
-rw-r--r--arch/arm/plat-versatile/Makefile5
-rw-r--r--arch/arm/plat-versatile/include/plat/sched_clock.h6
-rw-r--r--arch/arm/plat-versatile/sched-clock.c51
3 files changed, 37 insertions, 25 deletions
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index aaa571d1792..16dde081993 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -1,6 +1,7 @@
obj-y := clock.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/sched-clock.c b/arch/arm/plat-versatile/sched-clock.c
index 9768cf7e83d..3d6a4c292ca 100644
--- a/arch/arm/plat-versatile/sched-clock.c
+++ b/arch/arm/plat-versatile/sched-clock.c
@@ -18,36 +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 <asm/div64.h>
+#include <linux/sched.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);
}