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authorTony Luck <tony.luck@intel.com>2007-07-20 11:22:30 -0700
committerTony Luck <tony.luck@intel.com>2007-07-20 11:22:30 -0700
commit0aa366f351d044703e25c8425e508170e80d83b1 (patch)
tree485040cbef6157b9bcb2e7b1b85920d1e391ab68 /arch/ia64/sn/kernel/sn2/timer.c
parent5bae7ac9feba925fd0099057f6b23d7be80b7b41 (diff)
[IA64] Convert to generic timekeeping/clocksource
This is a merge of Peter Keilty's initial patch (which was revived by Bob Picco) for this with Hidetoshi Seto's fixes and scaling improvements. Acked-by: Bob Picco <bob.picco@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/sn/kernel/sn2/timer.c')
-rw-r--r--arch/ia64/sn/kernel/sn2/timer.c29
1 files changed, 21 insertions, 8 deletions
diff --git a/arch/ia64/sn/kernel/sn2/timer.c b/arch/ia64/sn/kernel/sn2/timer.c
index 56a88b6df4b..19e25d2b64f 100644
--- a/arch/ia64/sn/kernel/sn2/timer.c
+++ b/arch/ia64/sn/kernel/sn2/timer.c
@@ -11,6 +11,7 @@
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/interrupt.h>
+#include <linux/clocksource.h>
#include <asm/hw_irq.h>
#include <asm/system.h>
@@ -22,11 +23,21 @@
extern unsigned long sn_rtc_cycles_per_second;
-static struct time_interpolator sn2_interpolator = {
- .drift = -1,
- .shift = 10,
- .mask = (1LL << 55) - 1,
- .source = TIME_SOURCE_MMIO64
+static void __iomem *sn2_mc;
+
+static cycle_t read_sn2(void)
+{
+ return (cycle_t)readq(sn2_mc);
+}
+
+static struct clocksource clocksource_sn2 = {
+ .name = "sn2_rtc",
+ .rating = 300,
+ .read = read_sn2,
+ .mask = (1LL << 55) - 1,
+ .mult = 0,
+ .shift = 10,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
/*
@@ -47,9 +58,11 @@ ia64_sn_udelay (unsigned long usecs)
void __init sn_timer_init(void)
{
- sn2_interpolator.frequency = sn_rtc_cycles_per_second;
- sn2_interpolator.addr = RTC_COUNTER_ADDR;
- register_time_interpolator(&sn2_interpolator);
+ sn2_mc = RTC_COUNTER_ADDR;
+ clocksource_sn2.fsys_mmio = RTC_COUNTER_ADDR;
+ clocksource_sn2.mult = clocksource_hz2mult(sn_rtc_cycles_per_second,
+ clocksource_sn2.shift);
+ clocksource_register(&clocksource_sn2);
ia64_udelay = &ia64_sn_udelay;
}