diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-u300/clock.c | 6 | ||||
| -rw-r--r-- | arch/arm/mach-u300/timer.c | 17 |
2 files changed, 13 insertions, 10 deletions
diff --git a/arch/arm/mach-u300/clock.c b/arch/arm/mach-u300/clock.c index 7a94729caff..60acf9e708a 100644 --- a/arch/arm/mach-u300/clock.c +++ b/arch/arm/mach-u300/clock.c @@ -1204,10 +1204,14 @@ static struct clk timer_clk = { .lock = __SPIN_LOCK_UNLOCKED(timer_clk.lock), }; +/* + * There is a binary divider in the hardware that divides + * the 13MHz PLL by 13 down to 1 MHz. + */ static struct clk app_timer_clk = { .name = "TIMER_APP", .parent = &slow_clk, - .rate = 13000000, + .rate = 1000000, .hw_ctrld = true, .reset = true, .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR, diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c index 01f16183195..3fc4472719b 100644 --- a/arch/arm/mach-u300/timer.c +++ b/arch/arm/mach-u300/timer.c @@ -25,6 +25,8 @@ #include <asm/mach/time.h> #include <asm/mach/irq.h> +/* Be able to sleep for atleast 4 seconds (usually more) */ +#define APPTIMER_MIN_RANGE 4 /* * APP side special timer registers @@ -308,8 +310,6 @@ static struct clock_event_device clockevent_u300_1mhz = { .name = "GPT1", .rating = 300, /* Reasonably fast and accurate clock event */ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, - /* 22 calculated using the algorithm in arch/mips/kernel/time.c */ - .shift = 22, .set_next_event = u300_set_next_event, .set_mode = u300_set_mode, }; @@ -342,8 +342,6 @@ static struct clocksource clocksource_u300_1mhz = { .rating = 300, /* Reasonably fast and accurate clock source */ .read = u300_get_cycles, .mask = CLOCKSOURCE_MASK(32), /* 32 bits */ - /* 22 calculated using the algorithm in arch/mips/kernel/time.c */ - .shift = 22, .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; @@ -369,11 +367,13 @@ unsigned long long notrace sched_clock(void) static void __init u300_timer_init(void) { struct clk *clk; + unsigned long rate; /* Clock the interrupt controller */ clk = clk_get_sys("apptimer", NULL); BUG_ON(IS_ERR(clk)); clk_enable(clk); + rate = clk_get_rate(clk); /* * Disable the "OS" and "DD" timers - these are designed for Symbian! @@ -412,15 +412,14 @@ static void __init u300_timer_init(void) writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE, U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT2); - /* This is a pure microsecond clock source */ - clocksource_u300_1mhz.mult = - clocksource_khz2mult(1000, clocksource_u300_1mhz.shift); + clocksource_calc_mult_shift(&clocksource_u300_1mhz, + rate, APPTIMER_MIN_RANGE); if (clocksource_register(&clocksource_u300_1mhz)) printk(KERN_ERR "timer: failed to initialize clock " "source %s\n", clocksource_u300_1mhz.name); - clockevent_u300_1mhz.mult = - div_sc(1000000, NSEC_PER_SEC, clockevent_u300_1mhz.shift); + clockevents_calc_mult_shift(&clockevent_u300_1mhz, + rate, APPTIMER_MIN_RANGE); /* 32bit counter, so 32bits delta is max */ clockevent_u300_1mhz.max_delta_ns = clockevent_delta2ns(0xffffffff, &clockevent_u300_1mhz); |