aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorKevin Hilman <khilman@mvista.com>2006-09-22 00:58:57 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-28 20:59:25 +0100
commit84904d0ead0a8c419abd45c7b2ac8d76d50a0d48 (patch)
treef0744701f7eb7efad9adc63e2e7113a141de8fec /arch
parent746140c71d537560bbd22c1b148fb21031c30e71 (diff)
downloadlinaro-lsk-84904d0ead0a8c419abd45c7b2ac8d76d50a0d48.tar.gz
[ARM] 3856/1: Add clocksource for Intel IXP4xx platforms
Enables the ixp4xx platforms to use Generic time-of-day. Signed-off-by: Kevin Hilman <khilman@mvista.com> Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mach-ixp4xx/common.c38
-rw-r--r--arch/arm/mach-ixp4xx/nslu2-setup.c2
3 files changed, 30 insertions, 11 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 314ac6ba0ec..147abe0383d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -226,6 +226,7 @@ config ARCH_IOP33X
config ARCH_IXP4XX
bool "IXP4xx-based"
depends on MMU
+ select GENERIC_TIME
help
Support for Intel's IXP4XX (XScale) family of processors.
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 7c25dbd5a18..35dd8b3824b 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -26,6 +26,7 @@
#include <linux/bitops.h>
#include <linux/time.h>
#include <linux/timex.h>
+#include <linux/clocksource.h>
#include <asm/hardware.h>
#include <asm/uaccess.h>
@@ -255,16 +256,6 @@ static unsigned volatile last_jiffy_time;
#define CLOCK_TICKS_PER_USEC ((CLOCK_TICK_RATE + USEC_PER_SEC/2) / USEC_PER_SEC)
-/* IRQs are disabled before entering here from do_gettimeofday() */
-static unsigned long ixp4xx_gettimeoffset(void)
-{
- u32 elapsed;
-
- elapsed = *IXP4XX_OSTS - last_jiffy_time;
-
- return elapsed / CLOCK_TICKS_PER_USEC;
-}
-
static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
write_seqlock(&xtime_lock);
@@ -309,7 +300,6 @@ static void __init ixp4xx_timer_init(void)
struct sys_timer ixp4xx_timer = {
.init = ixp4xx_timer_init,
- .offset = ixp4xx_gettimeoffset,
};
static struct resource ixp46x_i2c_resources[] = {
@@ -365,3 +355,29 @@ void __init ixp4xx_sys_init(void)
ixp4xx_exp_bus_size >> 20);
}
+cycle_t ixp4xx_get_cycles(void)
+{
+ return *IXP4XX_OSTS;
+}
+
+static struct clocksource clocksource_ixp4xx = {
+ .name = "OSTS",
+ .rating = 200,
+ .read = ixp4xx_get_cycles,
+ .mask = CLOCKSOURCE_MASK(32),
+ .shift = 20,
+ .is_continuous = 1,
+};
+
+unsigned long ixp4xx_timer_freq = FREQ;
+static int __init ixp4xx_clocksource_init(void)
+{
+ clocksource_ixp4xx.mult =
+ clocksource_hz2mult(ixp4xx_timer_freq,
+ clocksource_ixp4xx.shift);
+ clocksource_register(&clocksource_ixp4xx);
+
+ return 0;
+}
+
+device_initcall(ixp4xx_clocksource_init);
diff --git a/arch/arm/mach-ixp4xx/nslu2-setup.c b/arch/arm/mach-ixp4xx/nslu2-setup.c
index 749a337494d..162c266e5f8 100644
--- a/arch/arm/mach-ixp4xx/nslu2-setup.c
+++ b/arch/arm/mach-ixp4xx/nslu2-setup.c
@@ -159,6 +159,8 @@ static void nslu2_power_off(void)
static void __init nslu2_init(void)
{
+ ixp4xx_timer_freq = NSLU2_FREQ;
+
ixp4xx_sys_init();
nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);