diff options
Diffstat (limited to 'arch/arm/mach-sa1100')
| -rw-r--r-- | arch/arm/mach-sa1100/generic.c | 23 | ||||
| -rw-r--r-- | arch/arm/mach-sa1100/time.c | 36 |
2 files changed, 31 insertions, 28 deletions
diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c index 3555d616774c..59d14f0fdcf8 100644 --- a/arch/arm/mach-sa1100/generic.c +++ b/arch/arm/mach-sa1100/generic.c @@ -16,9 +16,7 @@ #include <linux/pm.h> #include <linux/cpufreq.h> #include <linux/ioport.h> -#include <linux/sched.h> /* just for sched_clock() - funny that */ #include <linux/platform_device.h> -#include <linux/cnt32_to_63.h> #include <asm/div64.h> #include <mach/hardware.h> @@ -110,27 +108,6 @@ unsigned int sa11x0_getspeed(unsigned int cpu) } /* - * This is the SA11x0 sched_clock implementation. This has - * a resolution of 271ns, and a maximum value of 32025597s (370 days). - * - * The return value is guaranteed to be monotonic in that range as - * long as there is always less than 582 seconds between successive - * calls to this function. - * - * ( * 1E9 / 3686400 => * 78125 / 288) - */ -unsigned long long sched_clock(void) -{ - unsigned long long v = cnt32_to_63(OSCR); - - /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */ - v *= 78125<<1; - do_div(v, 288<<1); - - return v; -} - -/* * Default power-off for SA1100 */ static void sa1100_power_off(void) diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c index 74b6e0e570b6..ae4f3d80416f 100644 --- a/arch/arm/mach-sa1100/time.c +++ b/arch/arm/mach-sa1100/time.c @@ -12,12 +12,39 @@ #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/irq.h> +#include <linux/sched.h> /* just for sched_clock() - funny that */ #include <linux/timex.h> #include <linux/clockchips.h> #include <asm/mach/time.h> +#include <asm/sched_clock.h> #include <mach/hardware.h> +/* + * This is the SA11x0 sched_clock implementation. + */ +static DEFINE_CLOCK_DATA(cd); + +/* + * Constants generated by clocks_calc_mult_shift(m, s, 3.6864MHz, + * NSEC_PER_SEC, 60). + * This gives a resolution of about 271ns and a wrap period of about 19min. + */ +#define SC_MULT 2275555556u +#define SC_SHIFT 23 + +unsigned long long notrace sched_clock(void) +{ + u32 cyc = OSCR; + return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT); +} + +static void notrace sa1100_update_sched_clock(void) +{ + u32 cyc = OSCR; + update_sched_clock(&cd, cyc, (u32)~0); +} + #define MIN_OSCR_DELTA 2 static irqreturn_t sa1100_ost0_interrupt(int irq, void *dev_id) @@ -81,7 +108,6 @@ static struct clocksource cksrc_sa1100_oscr = { .rating = 200, .read = sa1100_read_oscr, .mask = CLOCKSOURCE_MASK(32), - .shift = 20, .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; @@ -97,6 +123,9 @@ static void __init sa1100_timer_init(void) OIER = 0; /* disable any timer interrupts */ OSSR = 0xf; /* clear status on all timers */ + init_fixed_sched_clock(&cd, sa1100_update_sched_clock, 32, + 3686400, SC_MULT, SC_SHIFT); + ckevt_sa1100_osmr0.mult = div_sc(3686400, NSEC_PER_SEC, ckevt_sa1100_osmr0.shift); ckevt_sa1100_osmr0.max_delta_ns = @@ -105,12 +134,9 @@ static void __init sa1100_timer_init(void) clockevent_delta2ns(MIN_OSCR_DELTA * 2, &ckevt_sa1100_osmr0) + 1; ckevt_sa1100_osmr0.cpumask = cpumask_of(0); - cksrc_sa1100_oscr.mult = - clocksource_hz2mult(CLOCK_TICK_RATE, cksrc_sa1100_oscr.shift); - setup_irq(IRQ_OST0, &sa1100_timer_irq); - clocksource_register(&cksrc_sa1100_oscr); + clocksource_register_hz(&cksrc_sa1100_oscr, CLOCK_TICK_RATE); clockevents_register_device(&ckevt_sa1100_osmr0); } |