1 files changed, 99 insertions, 0 deletions
diff --git a/arch/score/kernel/time.c b/arch/score/kernel/time.c
new file mode 100644
index 0000000..f0a43aff
--- /dev/null
+++ b/arch/score/kernel/time.c
@@ -0,0 +1,99 @@
+/*
+ * arch/score/kernel/time.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+
+#include <asm/scoreregs.h>
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evdev = dev_id;
+
+	/* clear timer interrupt flag */
+	outl(1, P_TIMER0_CPP_REG);
+	evdev->event_handler(evdev);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction timer_irq = {
+	.handler = timer_interrupt,
+	.flags = IRQF_DISABLED | IRQF_TIMER,
+	.name = "timer",
+};
+
+static int score_timer_set_next_event(unsigned long delta,
+		struct clock_event_device *evdev)
+{
+	outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL);
+	outl(delta, P_TIMER0_PRELOAD);
+	outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL);
+
+	return 0;
+}
+
+static void score_timer_set_mode(enum clock_event_mode mode,
+		struct clock_event_device *evdev)
+{
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL);
+		outl(SYSTEM_CLOCK/HZ, P_TIMER0_PRELOAD);
+		outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL);
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_RESUME:
+	case CLOCK_EVT_MODE_UNUSED:
+		break;
+	default:
+		BUG();
+	}
+}
+
+static struct clock_event_device score_clockevent = {
+	.name		= "score_clockevent",
+	.features	= CLOCK_EVT_FEAT_PERIODIC,
+	.shift		= 16,
+	.set_next_event	= score_timer_set_next_event,
+	.set_mode	= score_timer_set_mode,
+};
+
+void __init time_init(void)
+{
+	timer_irq.dev_id = &score_clockevent;
+	setup_irq(IRQ_TIMER , &timer_irq);
+
+	/* setup COMPARE clockevent */
+	score_clockevent.mult = div_sc(SYSTEM_CLOCK, NSEC_PER_SEC,
+					score_clockevent.shift);
+	score_clockevent.max_delta_ns = clockevent_delta2ns((u32)~0,
+					&score_clockevent);
+	score_clockevent.min_delta_ns = clockevent_delta2ns(50,
+						&score_clockevent) + 1;
+	score_clockevent.cpumask = cpumask_of(0);
+	clockevents_register_device(&score_clockevent);
+}