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Diffstat (limited to 'cpu/arm920t/ks8695/timer.c')
-rw-r--r--cpu/arm920t/ks8695/timer.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/cpu/arm920t/ks8695/timer.c b/cpu/arm920t/ks8695/timer.c
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+++ b/cpu/arm920t/ks8695/timer.c
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+/*
+ * (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/arch/platform.h>
+
+/*
+ * Handy KS8695 register access functions.
+ */
+#define ks8695_read(a) *((volatile ulong *) (KS8695_IO_BASE + (a)))
+#define ks8695_write(a,v) *((volatile ulong *) (KS8695_IO_BASE + (a))) = (v)
+
+ulong timer_ticks;
+
+int timer_init (void)
+{
+ reset_timer();
+
+ return 0;
+}
+
+/*
+ * Initial timer set constants. Nothing complicated, just set for a 1ms
+ * tick.
+ */
+#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_1)
+#define TIMER_COUNT (TIMER_INTERVAL / 2)
+#define TIMER_PULSE TIMER_COUNT
+
+void reset_timer_masked(void)
+{
+ /* Set the hadware timer for 1ms */
+ ks8695_write(KS8695_TIMER1, TIMER_COUNT);
+ ks8695_write(KS8695_TIMER1_PCOUNT, TIMER_PULSE);
+ ks8695_write(KS8695_TIMER_CTRL, 0x2);
+ timer_ticks = 0;
+}
+
+void reset_timer(void)
+{
+ reset_timer_masked();
+}
+
+ulong get_timer_masked(void)
+{
+ /* Check for timer wrap */
+ if (ks8695_read(KS8695_INT_STATUS) & KS8695_INTMASK_TIMERINT1) {
+ /* Clear interrupt condition */
+ ks8695_write(KS8695_INT_STATUS, KS8695_INTMASK_TIMERINT1);
+ timer_ticks++;
+ }
+ return timer_ticks;
+}
+
+ulong get_timer(ulong base)
+{
+ return (get_timer_masked() - base);
+}
+
+void set_timer(ulong t)
+{
+ timer_ticks = t;
+}
+
+void udelay(ulong usec)
+{
+ ulong start = get_timer_masked();
+ ulong end;
+
+ /* Only 1ms resolution :-( */
+ end = usec / 1000;
+ while (get_timer(start) < end)
+ ;
+}
+
+void reset_cpu (ulong ignored)
+{
+ ulong tc;
+
+ /* Set timer0 to watchdog, and let it timeout */
+ tc = ks8695_read(KS8695_TIMER_CTRL) & 0x2;
+ ks8695_write(KS8695_TIMER_CTRL, tc);
+ ks8695_write(KS8695_TIMER0, ((10 << 8) | 0xff));
+ ks8695_write(KS8695_TIMER_CTRL, (tc | 0x1));
+
+ /* Should only wait here till watchdog resets */
+ for (;;)
+ ;
+}