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clocksource: convert OMAP1 to 32-bit down counting clocksource

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Convert the OMAP1 32-bit down counting clocksource to the generic
clocksource infrastructure.

Tested-by: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-05-09 09:51:03 +01:00
parent 5c61ddcfaf
commit 933e54a53c
2 changed files with 7 additions and 17 deletions
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23
arch/arm/mach-omap1/time.c
View File

@ -190,24 +190,11 @@ static __init void omap_init_mpu_timer(unsigned long rate)
* ---------------------------------------------------------------------------
*/
static cycle_t mpu_read(struct clocksource *cs)
{
return ~omap_mpu_timer_read(1);
}
static struct clocksource clocksource_mpu = {
.name = "mpu_timer2",
.rating = 300,
.read = mpu_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static DEFINE_CLOCK_DATA(cd);
static inline unsigned long long notrace _omap_mpu_sched_clock(void)
{
u32 cyc = mpu_read(&clocksource_mpu);
u32 cyc = ~omap_mpu_timer_read(1);
return cyc_to_sched_clock(&cd, cyc, (u32)~0);
}
@ -225,20 +212,22 @@ static unsigned long long notrace omap_mpu_sched_clock(void)
static void notrace mpu_update_sched_clock(void)
{
u32 cyc = mpu_read(&clocksource_mpu);
u32 cyc = ~omap_mpu_timer_read(1);
update_sched_clock(&cd, cyc, (u32)~0);
}
static void __init omap_init_clocksource(unsigned long rate)
{
omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(1);
static char err[] __initdata = KERN_ERR
"%s: can't register clocksource!\n";
omap_mpu_timer_start(1, ~0, 1);
init_sched_clock(&cd, mpu_update_sched_clock, 32, rate);
if (clocksource_register_hz(&clocksource_mpu, rate))
printk(err, clocksource_mpu.name);
if (clocksource_mmio_init(&timer->read_tim, "mpu_timer2", rate,
300, 32, clocksource_mmio_readl_down))
printk(err, "mpu_timer2");
}
static void __init omap_mpu_timer_init(void)

1
arch/arm/plat-omap/Kconfig
View File

@ -12,6 +12,7 @@ choice
config ARCH_OMAP1
bool "TI OMAP1"
select CLKDEV_LOOKUP
select CLKSRC_MMIO
help
"Systems based on omap7xx, omap15xx or omap16xx"