diff options
Diffstat (limited to 'arch/arm/plat-nomadik/timer.c')
| -rw-r--r-- | arch/arm/plat-nomadik/timer.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c index 9222e5522a4..f26ce2fb0d1 100644 --- a/arch/arm/plat-nomadik/timer.c +++ b/arch/arm/plat-nomadik/timer.c @@ -17,6 +17,7 @@ #include <linux/clk.h> #include <linux/jiffies.h> #include <linux/err.h> +#include <linux/delay.h> #include <asm/mach/time.h> #include <asm/sched_clock.h> @@ -142,6 +143,28 @@ static struct clock_event_device nmdk_clkevt = { .set_next_event = nmdk_clkevt_next, }; +#ifdef ARCH_HAS_READ_CURRENT_TIMER +static void nmdk_timer_delay_loop(unsigned long loops) +{ + unsigned long bclock, now; + + bclock = ~readl(mtu_base + MTU_VAL(0)); + do { + now = ~readl(mtu_base + MTU_VAL(0)); + /* If timer have been cleared (suspend) or wrapped we exit */ + if (unlikely(now < bclock)) + return; + } while ((now - bclock) < loops); +} + +/* Used to calibrate the delay */ +int read_current_timer(unsigned long *timer_val) +{ + *timer_val = ~readl(mtu_base + MTU_VAL(0)); + return 0; +} +#endif + /* * IRQ Handler for timer 1 of the MTU block. */ @@ -174,6 +197,11 @@ void nmdk_clksrc_reset(void) mtu_base + MTU_CR(0)); } +struct clock_event_device *nmdk_clkevt_get(void) +{ + return &nmdk_clkevt; +} + void __init nmdk_timer_init(void __iomem *base) { unsigned long rate; @@ -220,4 +248,8 @@ void __init nmdk_timer_init(void __iomem *base) setup_irq(IRQ_MTU0, &nmdk_timer_irq); nmdk_clkevt.cpumask = cpumask_of(0); clockevents_config_and_register(&nmdk_clkevt, rate, 2, 0xffffffffU); +#ifdef ARCH_HAS_READ_CURRENT_TIMER + set_delay_fn(nmdk_timer_delay_loop); +#endif + } |