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[ARM] 3856/1: Add clocksource for Intel IXP4xx platforms

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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>
This commit is contained in:
Kevin Hilman
2006-09-22 00:58:57 +01:00
committed by Russell King
parent 746140c71d
commit 84904d0ead
4 changed files with 35 additions and 11 deletions
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38
arch/arm/mach-ixp4xx/common.c
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@@ -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);