1 files changed, 117 insertions, 0 deletions
diff --git a/arch/arm/cpu/ixp/timer.c b/arch/arm/cpu/ixp/timer.c
new file mode 100644
index 0000000..663d989
--- /dev/null
+++ b/arch/arm/cpu/ixp/timer.c
@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2010
+ * Michael Schwingen, michael@schwingen.org
+ *
+ * (C) Copyright 2006
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * 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/ixp425.h>
+#include <asm/io.h>
+#include <div64.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * The IXP42x time-stamp timer runs at 2*OSC_IN (66.666MHz when using a
+ * 33.333MHz crystal).
+ */
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, CONFIG_IXP425_TIMER_CLK);
+	return tick;
+}
+
+static inline unsigned long long time_to_tick(unsigned long long time)
+{
+	time *= CONFIG_IXP425_TIMER_CLK;
+	do_div(time, CONFIG_SYS_HZ);
+	return time;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+	us = us * CONFIG_IXP425_TIMER_CLK + 999999;
+	do_div(us, 1000000);
+	return us;
+}
+
+unsigned long long get_ticks(void)
+{
+	ulong now = readl(IXP425_OSTS_B);
+
+	if (readl(IXP425_OSST) & IXP425_OSST_TIMER_TS_PEND) {
+		/* rollover of timestamp timer register */
+		gd->arch.timestamp += (0xFFFFFFFF - gd->arch.lastinc) + now + 1;
+		writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
+	} else {
+		/* move stamp forward with absolut diff ticks */
+		gd->arch.timestamp += (now - gd->arch.lastinc);
+	}
+	gd->arch.lastinc = now;
+	return gd->arch.timestamp;
+}
+
+
+void reset_timer_masked(void)
+{
+	/* capture current timestamp counter */
+	gd->arch.lastinc = readl(IXP425_OSTS_B);
+	/* start "advancing" time stamp from 0 */
+	gd->arch.timestamp = 0;
+}
+
+ulong get_timer_masked(void)
+{
+	return tick_to_time(get_ticks());
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay(unsigned long usec)
+{
+	unsigned long long tmp;
+
+	tmp = get_ticks() + us_to_tick(usec);
+
+	while (get_ticks() < tmp)
+		;
+}
+
+int timer_init(void)
+{
+	writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
+	return 0;
+}