[ARM] 4261/1: clockevent support for Versatile platform

Update Versatile platform to use new clockevent infrastructure.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cddd054676c043b18c83b2ba0ec76c35b4363401..d1f24aa89debf25c162522251ecbb8d67a3afdbe 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -167,6 +167,7 @@ config ARCH_VERSATILE
        select ARM_VIC
        select ICST307
        select GENERIC_TIME
+       select GENERIC_CLOCKEVENTS
        help
          This enables support for ARM Ltd Versatile board.
 

diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 08a9fe6eeadb48c2780cfe9f90f4294c3972ecfd..1275aa7d2eb198249a6d4f61a74780dd82440118 100644 (file)
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -27,6 +27,7 @@
 #include <linux/amba/bus.h>
 #include <linux/amba/clcd.h>
 #include <linux/clocksource.h>
+#include <linux/clockchips.h>
 
 #include <asm/cnt32_to_63.h>
 #include <asm/system.h>
@@ -829,19 +830,61 @@ void __init versatile_init(void)
 #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,
+};
+
 /*
  * IRQ handler for the timer
  */
 static irqreturn_t versatile_timer_interrupt(int irq, void *dev_id)
 {
-       write_seqlock(&xtime_lock);
+       struct clock_event_device *evt = &timer0_clockevent;
 
-       // ...clear the interrupt
        writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
 
-       timer_tick();
-
-       write_sequnlock(&xtime_lock);
+       evt->event_handler(evt);
 
        return IRQ_HANDLED;
 }
@@ -909,17 +952,22 @@ static void __init versatile_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, &versatile_timer_irq);
 
        versatile_clocksource_init();
+
+       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);
+
+       timer0_clockevent.cpumask = cpumask_of_cpu(0);
+       clockevents_register_device(&timer0_clockevent);
 }
 
 struct sys_timer versatile_timer = {