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clocksource: sun4i: Cleanup parent clock setup

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The current bring-up code for the timer was overly complicated. The only
thing we need is actually which clock we want to use as source and
that's pretty much all. Let's keep it that way.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Maxime Ripard 2013-07-16 16:45:38 +02:00 committed by Daniel Lezcano
parent c2b852f77b
commit a2c49e7b55
1 changed files with 5 additions and 10 deletions
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15
drivers/clocksource/sun4i_timer.c
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@ -30,6 +30,9 @@
#define TIMER_CTL_REG(val) (0x10 * val + 0x10)
#define TIMER_CTL_ENABLE BIT(0)
#define TIMER_CTL_RELOAD BIT(1)
#define TIMER_CTL_CLK_SRC(val) (((val) & 0x3) << 2)
#define TIMER_CTL_CLK_SRC_OSC24M (1)
#define TIMER_CTL_CLK_PRES(val) (((val) & 0x7) << 4)
#define TIMER_CTL_ONESHOT BIT(7)
#define TIMER_INTVAL_REG(val) (0x10 * (val) + 0x14)
#define TIMER_CNTVAL_REG(val) (0x10 * (val) + 0x18)
@ -168,16 +171,8 @@ static void __init sun4i_timer_init(struct device_node *node)
writel(rate / HZ, timer_base + TIMER_INTVAL_REG(0));
/* set clock source to HOSC, 16 pre-division */
val = readl(timer_base + TIMER_CTL_REG(0));
val &= ~(0x07 << 4);
val &= ~(0x03 << 2);
val |= (4 << 4) | (1 << 2);
writel(val, timer_base + TIMER_CTL_REG(0));
/* set mode to auto reload */
val = readl(timer_base + TIMER_CTL_REG(0));
writel(val | TIMER_CTL_RELOAD, timer_base + TIMER_CTL_REG(0));
writel(TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M) | TIMER_CTL_RELOAD,
timer_base + TIMER_CTL_REG(0));
ret = setup_irq(irq, &sun4i_timer_irq);
if (ret)