clocksource: tegra: Use us counter as delay timer
All Tegra SoCs have a freerunning microsecond counter which can be used as a delay timer. Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Stephen Warren <swarren@nvidia.com>
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@ -27,6 +27,7 @@
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/sched_clock.h>
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#include <linux/delay.h>
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#include <asm/mach/time.h>
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#include <asm/smp_twd.h>
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@ -53,6 +54,8 @@ static void __iomem *rtc_base;
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static struct timespec persistent_ts;
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static u64 persistent_ms, last_persistent_ms;
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static struct delay_timer tegra_delay_timer;
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#define timer_writel(value, reg) \
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__raw_writel(value, timer_reg_base + (reg))
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#define timer_readl(reg) \
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@ -139,6 +142,11 @@ static void tegra_read_persistent_clock(struct timespec *ts)
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*ts = *tsp;
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}
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static unsigned long tegra_delay_timer_read_counter_long(void)
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{
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return readl(timer_reg_base + TIMERUS_CNTR_1US);
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}
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static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id)
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{
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struct clock_event_device *evt = (struct clock_event_device *)dev_id;
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@ -206,6 +214,11 @@ static void __init tegra20_init_timer(struct device_node *np)
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BUG();
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}
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tegra_delay_timer.read_current_timer =
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tegra_delay_timer_read_counter_long;
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tegra_delay_timer.freq = 1000000;
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register_current_timer_delay(&tegra_delay_timer);
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ret = setup_irq(tegra_timer_irq.irq, &tegra_timer_irq);
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if (ret) {
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pr_err("Failed to register timer IRQ: %d\n", ret);
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