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clocksource: convert SPEAr platforms 16-bit up counting clocksource

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Convert SPEAr platforms 16-bit up counting clocksource, which requires
a 16-bit register access read rather than 32-bit.

Acked-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-05-08 17:10:14 +01:00
parent c5039f5232
commit d6e15d7853
2 changed files with 3 additions and 14 deletions
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1
arch/arm/Kconfig
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@@ -884,6 +884,7 @@ config PLAT_SPEAR
select ARM_AMBA select ARM_AMBA
select ARCH_REQUIRE_GPIOLIB select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP select CLKDEV_LOOKUP
select CLKSRC_MMIO
select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS
select HAVE_CLK select HAVE_CLK
help help

16
arch/arm/plat-spear/time.c
View File

@@ -70,19 +70,6 @@ static void clockevent_set_mode(enum clock_event_mode mode,
static int clockevent_next_event(unsigned long evt, static int clockevent_next_event(unsigned long evt,
struct clock_event_device *clk_event_dev); struct clock_event_device *clk_event_dev);
static cycle_t clocksource_read_cycles(struct clocksource *cs)
{
return (cycle_t) readw(gpt_base + COUNT(CLKSRC));
}
static struct clocksource clksrc = {
.name = "tmr1",
.rating = 200, /* its a pretty decent clock */
.read = clocksource_read_cycles,
.mask = 0xFFFF, /* 16 bits */
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void spear_clocksource_init(void) static void spear_clocksource_init(void)
{ {
u32 tick_rate; u32 tick_rate;
@@ -103,7 +90,8 @@ static void spear_clocksource_init(void)
writew(val, gpt_base + CR(CLKSRC)); writew(val, gpt_base + CR(CLKSRC));
/* register the clocksource */ /* register the clocksource */
clocksource_register_hz(&clksrc, tick_rate); clocksource_mmio_init(gpt_base + COUNT(CLKSRC), "tmr1", tick_rate,
200, 16, clocksource_mmio_readw_up);
} }
static struct clock_event_device clkevt = { static struct clock_event_device clkevt = {