diff options
Diffstat (limited to 'arch/arm/mach-ns9xxx')
| -rw-r--r-- | arch/arm/mach-ns9xxx/time.c | 68 |
1 files changed, 42 insertions, 26 deletions
diff --git a/arch/arm/mach-ns9xxx/time.c b/arch/arm/mach-ns9xxx/time.c index 3327d302618..d2934550176 100644 --- a/arch/arm/mach-ns9xxx/time.c +++ b/arch/arm/mach-ns9xxx/time.c @@ -11,6 +11,9 @@ #include <linux/jiffies.h> #include <linux/interrupt.h> #include <linux/irq.h> +#include <linux/stringify.h> +#include <linux/clocksource.h> + #include <asm/arch-ns9xxx/regs-sys.h> #include <asm/arch-ns9xxx/clock.h> #include <asm/arch-ns9xxx/irqs.h> @@ -18,8 +21,7 @@ #include "generic.h" #define TIMERCLOCKSELECT 64 - -static u32 usecs_per_tick; +#define TIMER_CLOCKSOURCE 1 static irqreturn_t ns9xxx_timer_interrupt(int irq, void *dev_id) @@ -45,39 +47,30 @@ ns9xxx_timer_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } -static unsigned long ns9xxx_timer_gettimeoffset(void) -{ - /* return the microseconds which have passed since the last interrupt - * was _serviced_. That is, if an interrupt is pending or the counter - * reloads, return one period more. */ - - u32 counter1 = SYS_TR(0); - int pending = SYS_ISR & (1 << IRQ_TIMER0); - u32 counter2 = SYS_TR(0); - u32 elapsed; - - if (pending || counter2 > counter1) - elapsed = 2 * SYS_TRC(0) - counter2; - else - elapsed = SYS_TRC(0) - counter1; - - return (elapsed * usecs_per_tick) >> 16; - -} - static struct irqaction ns9xxx_timer_irq = { .name = "NS9xxx Timer Tick", .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, .handler = ns9xxx_timer_interrupt, }; +static cycle_t ns9xxx_clocksource_read(void) +{ + return SYS_TR(TIMER_CLOCKSOURCE); +} + +static struct clocksource ns9xxx_clocksource = { + .name = "ns9xxx-timer" __stringify(TIMER_CLOCKSOURCE), + .rating = 300, + .read = ns9xxx_clocksource_read, + .mask = CLOCKSOURCE_MASK(32), + .shift = 20, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + static void __init ns9xxx_timer_init(void) { int tc; - usecs_per_tick = - SH_DIV(1000000 * TIMERCLOCKSELECT, ns9xxx_cpuclock(), 16); - /* disable timer */ if ((tc = SYS_TC(0)) & SYS_TCx_TEN) SYS_TC(0) = tc & ~SYS_TCx_TEN; @@ -94,9 +87,32 @@ static void __init ns9xxx_timer_init(void) SYS_TC(0) = tc; setup_irq(IRQ_TIMER0, &ns9xxx_timer_irq); + + tc = SYS_TC(TIMER_CLOCKSOURCE); + if (REGGET(tc, SYS_TCx, TEN)) { + REGSET(tc, SYS_TCx, TEN, DIS); + SYS_TC(TIMER_CLOCKSOURCE) = tc; + } + + SYS_TRC(TIMER_CLOCKSOURCE) = 0; + + REGSET(tc, SYS_TCx, TEN, EN); + REGSET(tc, SYS_TCx, TDBG, STOP); + REGSET(tc, SYS_TCx, TLCS, CPU); + REGSET(tc, SYS_TCx, TM, IEE); + REGSET(tc, SYS_TCx, INTS, DIS); + REGSET(tc, SYS_TCx, UDS, UP); + REGSET(tc, SYS_TCx, TSZ, 32); + REGSET(tc, SYS_TCx, REN, EN); + + SYS_TC(TIMER_CLOCKSOURCE) = tc; + + ns9xxx_clocksource.mult = clocksource_hz2mult(ns9xxx_cpuclock(), + ns9xxx_clocksource.shift); + + clocksource_register(&ns9xxx_clocksource); } struct sys_timer ns9xxx_timer = { .init = ns9xxx_timer_init, - .offset = ns9xxx_timer_gettimeoffset, }; |