diff options
Diffstat (limited to 'arch/arm/mach-realview/core.c')
| -rw-r--r-- | arch/arm/mach-realview/core.c | 78 |
1 files changed, 66 insertions, 12 deletions
diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c index f805840f6f4..6c68deed84d 100644 --- a/arch/arm/mach-realview/core.c +++ b/arch/arm/mach-realview/core.c @@ -26,6 +26,7 @@ #include <linux/amba/bus.h> #include <linux/amba/clcd.h> #include <linux/clocksource.h> +#include <linux/clockchips.h> #include <asm/system.h> #include <asm/hardware.h> @@ -485,20 +486,77 @@ void realview_leds_event(led_event_t ledevt) #define TICKS2USECS(x) ((x) / TICKS_PER_uSEC) #endif +static void timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *clk) +{ + unsigned long ctrl; + + switch(mode) { + case CLOCK_EVT_MODE_PERIODIC: + writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD); + + ctrl = TIMER_CTRL_PERIODIC; + ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE; + break; + case CLOCK_EVT_MODE_ONESHOT: + /* period set, and timer enabled in 'next_event' hook */ + ctrl = TIMER_CTRL_ONESHOT; + ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE; + break; + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + default: + ctrl = 0; + } + + writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL); +} + +static int timer_set_next_event(unsigned long evt, + struct clock_event_device *unused) +{ + unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL); + + writel(evt, TIMER0_VA_BASE + TIMER_LOAD); + writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL); + + return 0; +} + +static struct clock_event_device timer0_clockevent = { + .name = "timer0", + .shift = 32, + .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, + .set_mode = timer_set_mode, + .set_next_event = timer_set_next_event, + .rating = 300, + .irq = IRQ_TIMERINT0_1, + .cpumask = CPU_MASK_ALL, +}; + +static void __init realview_clockevents_init(void) +{ + timer0_clockevent.mult = + div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift); + timer0_clockevent.max_delta_ns = + clockevent_delta2ns(0xffffffff, &timer0_clockevent); + timer0_clockevent.min_delta_ns = + clockevent_delta2ns(0xf, &timer0_clockevent); + + clockevents_register_device(&timer0_clockevent); +} + /* * IRQ handler for the timer */ static irqreturn_t realview_timer_interrupt(int irq, void *dev_id) { - // ...clear the interrupt - writel(1, TIMER0_VA_BASE + TIMER_INTCLR); + struct clock_event_device *evt = &timer0_clockevent; - timer_tick(); + /* clear the interrupt */ + writel(1, TIMER0_VA_BASE + TIMER_INTCLR); -#if defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS) - smp_send_timer(); - update_process_times(user_mode(get_irq_regs())); -#endif + evt->event_handler(evt); return IRQ_HANDLED; } @@ -564,17 +622,13 @@ static void __init realview_timer_init(void) writel(0, TIMER2_VA_BASE + TIMER_CTRL); writel(0, TIMER3_VA_BASE + TIMER_CTRL); - writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD); - writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_VALUE); - writel(TIMER_DIVISOR | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC | - TIMER_CTRL_IE, TIMER0_VA_BASE + TIMER_CTRL); - /* * Make irqs happen for the system timer */ setup_irq(IRQ_TIMERINT0_1, &realview_timer_irq); realview_clocksource_init(); + realview_clockevents_init(); } struct sys_timer realview_timer = { |