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clocksource: sun4i: Add clocksource and sched clock drivers 

Use the second timer found on the Allwinner SoCs as a clock source and
sched clock, that were both not used yet on these platforms.

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 16:45:37 +02:00 committed by Daniel Lezcano
parent 9eded23215
commit 137c6b3c7c
1 changed files with 15 additions and 0 deletions
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15
drivers/clocksource/sun4i_timer.c
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@ -19,6 +19,7 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
@ -96,6 +97,11 @@ static struct irqaction sun4i_timer_irq = {
.dev_id = &sun4i_clockevent,
};
static u32 sun4i_timer_sched_read(void)
{
return ~readl(timer_base + TIMER_CNTVAL_REG(1));
}
static void __init sun4i_timer_init(struct device_node *node)
{
unsigned long rate = 0;
@ -117,6 +123,15 @@ static void __init sun4i_timer_init(struct device_node *node)
rate = clk_get_rate(clk);
writel(~0, timer_base + TIMER_INTVAL_REG(1));
writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD |
TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
timer_base + TIMER_CTL_REG(1));
setup_sched_clock(sun4i_timer_sched_read, 32, rate);
clocksource_mmio_init(timer_base + TIMER_CNTVAL_REG(1), node->name,
rate, 300, 32, clocksource_mmio_readl_down);
writel(rate / (TIMER_SCAL * HZ),
timer_base + TIMER_INTVAL_REG(0));