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clocksource: convert ARM 32-bit down counting clocksources

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Convert SP804, MXC, Nomadik and Orion 32-bit down-counting clocksources
to generic mmio clocksource infrastructure.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Alessandro Rubini <rubini@unipv.it>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Lennert Buytenhek <kernel@wantstofly.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-05-08 15:33:30 +01:00
parent 234b6ceddb
commit bfe45e0be8
6 changed files with 16 additions and 87 deletions
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30
arch/arm/common/timer-sp.c
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@@ -32,35 +32,17 @@
#define TIMER_FREQ_KHZ (1000)
#define TIMER_RELOAD (TIMER_FREQ_KHZ * 1000 / HZ)
static void __iomem *clksrc_base;
static cycle_t sp804_read(struct clocksource *cs)
{
return ~readl(clksrc_base + TIMER_VALUE);
}
static struct clocksource clocksource_sp804 = {
.name = "timer3",
.rating = 200,
.read = sp804_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
void __init sp804_clocksource_init(void __iomem *base)
{
struct clocksource *cs = &clocksource_sp804;
clksrc_base = base;
/* setup timer 0 as free-running clocksource */
writel(0, clksrc_base + TIMER_CTRL);
writel(0xffffffff, clksrc_base + TIMER_LOAD);
writel(0xffffffff, clksrc_base + TIMER_VALUE);
writel(0, base + TIMER_CTRL);
writel(0xffffffff, base + TIMER_LOAD);
writel(0xffffffff, base + TIMER_VALUE);
writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
clksrc_base + TIMER_CTRL);
base + TIMER_CTRL);
clocksource_register_khz(cs, TIMER_FREQ_KHZ);
clocksource_mmio_init(base + TIMER_VALUE, "timer3",
TIMER_FREQ_KHZ * 1000, 200, 32, clocksource_mmio_readl_down);
}