X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Farm%2Fmach-versatile%2Fcore.c;h=534f93282177034145f05c4f3549b1f894ab40cd;hb=fced80c735941fa518ac67c0b61bbe153fb8c050;hp=bf71507c76fd91602d2513c40f19e06a8740e06b;hpb=741441ab7800f1eb031e74fd720f4f8f361678ed;p=linux-2.6-omap-h63xx.git

diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index bf71507c76f..534f9328217 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -26,11 +26,13 @@
 #include <linux/interrupt.h>
 #include <linux/amba/bus.h>
 #include <linux/amba/clcd.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/io.h>
 
 #include <asm/cnt32_to_63.h>
 #include <asm/system.h>
-#include <asm/hardware.h>
-#include <asm/io.h>
+#include <mach/hardware.h>
 #include <asm/irq.h>
 #include <asm/leds.h>
 #include <asm/hardware/arm_timer.h>
@@ -828,69 +830,101 @@ void __init versatile_init(void)
 #define TICKS2USECS(x)	((x) / TICKS_PER_uSEC)
 #endif
 
-/*
- * Returns number of ms since last clock interrupt.  Note that interrupts
- * will have been disabled by do_gettimeoffset()
- */
-static unsigned long versatile_gettimeoffset(void)
+static void timer_set_mode(enum clock_event_mode mode,
+			   struct clock_event_device *clk)
 {
-	unsigned long ticks1, ticks2, status;
+	unsigned long ctrl;
 
-	/*
-	 * Get the current number of ticks.  Note that there is a race
-	 * condition between us reading the timer and checking for
-	 * an interrupt.  We get around this by ensuring that the
-	 * counter has not reloaded between our two reads.
-	 */
-	ticks2 = readl(TIMER0_VA_BASE + TIMER_VALUE) & 0xffff;
-	do {
-		ticks1 = ticks2;
-		status = __raw_readl(VA_IC_BASE + VIC_RAW_STATUS);
-		ticks2 = readl(TIMER0_VA_BASE + TIMER_VALUE) & 0xffff;
-	} while (ticks2 > ticks1);
+	switch(mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
 
-	/*
-	 * Number of ticks since last interrupt.
-	 */
-	ticks1 = TIMER_RELOAD - ticks2;
+		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;
+	}
 
-	/*
-	 * Interrupt pending?  If so, we've reloaded once already.
-	 *
-	 * FIXME: Need to check this is effectively timer 0 that expires
-	 */
-	if (status & IRQMASK_TIMERINT0_1)
-		ticks1 += TIMER_RELOAD;
+	writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL);
+}
 
-	/*
-	 * Convert the ticks to usecs
-	 */
-	return TICKS2USECS(ticks1);
+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;
 }
 
 static struct irqaction versatile_timer_irq = {
 	.name		= "Versatile Timer Tick",
-	.flags		= IRQF_DISABLED | IRQF_TIMER,
+	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 	.handler	= versatile_timer_interrupt,
 };
 
+static cycle_t versatile_get_cycles(void)
+{
+	return ~readl(TIMER3_VA_BASE + TIMER_VALUE);
+}
+
+static struct clocksource clocksource_versatile = {
+	.name 		= "timer3",
+ 	.rating		= 200,
+ 	.read		= versatile_get_cycles,
+	.mask		= CLOCKSOURCE_MASK(32),
+ 	.shift 		= 20,
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static int __init versatile_clocksource_init(void)
+{
+	/* setup timer3 as free-running clocksource */
+	writel(0, TIMER3_VA_BASE + TIMER_CTRL);
+	writel(0xffffffff, TIMER3_VA_BASE + TIMER_LOAD);
+	writel(0xffffffff, TIMER3_VA_BASE + TIMER_VALUE);
+	writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
+	       TIMER3_VA_BASE + TIMER_CTRL);
+
+ 	clocksource_versatile.mult =
+ 		clocksource_khz2mult(1000, clocksource_versatile.shift);
+ 	clocksource_register(&clocksource_versatile);
+
+ 	return 0;
+}
+
 /*
  * Set up timer interrupt, and return the current time in seconds.
  */
@@ -918,18 +952,25 @@ 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 = {
 	.init		= versatile_timer_init,
-	.offset		= versatile_gettimeoffset,
 };
+