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[ARM] sa1100: add clock source support 

Add generic clock source support for SA11x0 platforms.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-11-12 21:55:12 +00:00 committed by Russell King
parent 9b73e76f3c
commit d142b6e77d
2 changed files with 21 additions and 18 deletions
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1
arch/arm/Kconfig
View File

@ -366,6 +366,7 @@ config ARCH_SA1100
select ARCH_DISCONTIGMEM_ENABLE
select ARCH_MTD_XIP
select GENERIC_GPIO
select GENERIC_TIME
help
Support for StrongARM 11x0 based boards.

38
arch/arm/mach-sa1100/time.c
View File

@ -14,6 +14,7 @@
#include <linux/irq.h>
#include <linux/timex.h>
#include <linux/signal.h>
#include <linux/clocksource.h>
#include <asm/mach/time.h>
#include <asm/hardware.h>
@ -35,23 +36,6 @@ static int sa1100_set_rtc(void)
return 0;
}
/* IRQs are disabled before entering here from do_gettimeofday() */
static unsigned long sa1100_gettimeoffset (void)
{
unsigned long ticks_to_match, elapsed, usec;
/* Get ticks before next timer match */
ticks_to_match = OSMR0 - OSCR;
/* We need elapsed ticks since last match */
elapsed = LATCH - ticks_to_match;
/* Now convert them to usec */
usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH;
return usec;
}
#ifdef CONFIG_NO_IDLE_HZ
static unsigned long initial_match;
static int match_posponed;
@ -96,6 +80,20 @@ static struct irqaction sa1100_timer_irq = {
.handler = sa1100_timer_interrupt,
};
static cycle_t sa1100_read_oscr(void)
{
return OSCR;
}
static struct clocksource cksrc_sa1100_oscr = {
.name = "oscr",
.rating = 200,
.read = sa1100_read_oscr,
.mask = CLOCKSOURCE_MASK(32),
.shift = 20,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init sa1100_timer_init(void)
{
unsigned long flags;
@ -109,6 +107,11 @@ static void __init sa1100_timer_init(void)
OIER = OIER_E0; /* enable match on timer 0 to cause interrupts */
OSMR0 = OSCR + LATCH; /* set initial match */
local_irq_restore(flags);
cksrc_sa1100_oscr.mult =
clocksource_hz2mult(CLOCK_TICK_RATE, cksrc_sa1100_oscr.shift);
clocksource_register(&cksrc_sa1100_oscr);
}
#ifdef CONFIG_NO_IDLE_HZ
@ -182,7 +185,6 @@ struct sys_timer sa1100_timer = {
.init = sa1100_timer_init,
.suspend = sa1100_timer_suspend,
.resume = sa1100_timer_resume,
.offset = sa1100_gettimeoffset,
#ifdef CONFIG_NO_IDLE_HZ
.dyn_tick = &sa1100_dyn_tick,
#endif