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clocksource: convert W90x900 24-bit down counting clocksource

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Convert the W90x900 24-bit down-counting clocksource to the generic
mmio clocksource infrastructure

Acked-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-05-08 15:34:39 +01:00
parent bfe45e0be8
commit 6fa5d5f764
2 changed files with 3 additions and 15 deletions
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1
arch/arm/Kconfig
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@ -575,6 +575,7 @@ config ARCH_W90X900
select CPU_ARM926T
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select GENERIC_CLOCKEVENTS
help
Support for Nuvoton (Winbond logic dept.) ARM9 processor,

17
arch/arm/mach-w90x900/time.c
View File

@ -43,7 +43,6 @@
#define PRESCALE 0x63 /* Divider = prescale + 1 */
#define TDR_SHIFT 24
#define TDR_MASK ((1 << TDR_SHIFT) - 1)
static unsigned int timer0_load;
@ -143,19 +142,6 @@ static void __init nuc900_clockevents_init(void)
clockevents_register_device(&nuc900_clockevent_device);
}
static cycle_t nuc900_get_cycles(struct clocksource *cs)
{
return (~__raw_readl(REG_TDR1)) & TDR_MASK;
}
static struct clocksource clocksource_nuc900 = {
.name = "nuc900-timer1",
.rating = 200,
.read = nuc900_get_cycles,
.mask = CLOCKSOURCE_MASK(TDR_SHIFT),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init nuc900_clocksource_init(void)
{
unsigned int val;
@ -175,7 +161,8 @@ static void __init nuc900_clocksource_init(void)
val |= (COUNTEN | PERIOD | PRESCALE);
__raw_writel(val, REG_TCSR1);
clocksource_register_hz(&clocksource_nuc900, rate);
clocksource_mmio_init(REG_TDR1, "nuc900-timer1", rate, 200,
TDR_SHIFT, clocksource_mmio_readl_down);
}
static void __init nuc900_timer_init(void)