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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2013-07-16 16:45:37 +0200 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2013-07-18 15:27:15 +0200 |
| commit | 137c6b3c7c63944a9cb51de0870b72f62d240f62 (patch) | |
| tree | 35f7bc2835c2be7cb5e6dd0aa190b1537b527146 /drivers/clocksource/sun4i_timer.c | |
| parent | 9eded23215e99338155c18f6d860859106568bb0 (diff) | |
| download | lwn-137c6b3c7c63944a9cb51de0870b72f62d240f62.tar.gz lwn-137c6b3c7c63944a9cb51de0870b72f62d240f62.zip | |
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>
Diffstat (limited to 'drivers/clocksource/sun4i_timer.c')
| -rw-r--r-- | drivers/clocksource/sun4i_timer.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c index f5e227b06ad5..b581c93f20b3 100644 --- a/drivers/clocksource/sun4i_timer.c +++ b/drivers/clocksource/sun4i_timer.c @@ -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)); |