1 files changed, 82 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/clocksource-imx23.c b/arch/arm/mach-mxs/clocksource-imx23.c
new file mode 100644
index 0000000000..f7c94c1d75
--- /dev/null
+++ b/arch/arm/mach-mxs/clocksource-imx23.c
@@ -0,0 +1,82 @@
+/*
+ * (C) Copyright 2010 Juergen Beisert - Pengutronix
+ *
+ * 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 <init.h>
+#include <clock.h>
+#include <notifier.h>
+#include <mach/imx-regs.h>
+#include <mach/clock.h>
+#include <asm/io.h>
+
+#define TIMROTCTRL 0x00
+#define TIMCTRL1 0x40
+#define TIMCTRL1_SET 0x44
+#define TIMCTRL1_CLR 0x48
+#define TIMCTRL1_TOG 0x4c
+# define TIMCTRL_RELOAD (1 << 6)
+# define TIMCTRL_UPDATE (1 << 7)
+# define TIMCTRL_PRESCALE(x) ((x & 0x3) << 4)
+# define TIMCTRL_SELECT(x) (x & 0xf)
+#define TIMCOUNT1 0x50
+
+static const unsigned long timer_base = IMX_TIM1_BASE;
+
+#define CLOCK_TICK_RATE (32000)
+
+static uint64_t imx23_clocksource_read(void)
+{
+	/* only the upper bits are the valid */
+	return ~(readl(timer_base + TIMCOUNT1) >> 16);
+}
+
+static struct clocksource cs = {
+	.read	= imx23_clocksource_read,
+	.mask	= CLOCKSOURCE_MASK(16),
+	.shift	= 10,
+};
+
+static int imx23_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data)
+{
+	cs.mult = clocksource_hz2mult(CLOCK_TICK_RATE/*imx_get_xclk()*/, cs.shift);
+	return 0;
+}
+
+static struct notifier_block imx23_clock_notifier = {
+	.notifier_call = imx23_clocksource_clock_change,
+};
+
+static int clocksource_init(void)
+{
+	/* enable the whole timer block */
+	writel(0x3e000000, timer_base + TIMROTCTRL);
+	/* setup general purpose timer 1 */
+	writel(0x00000000, timer_base + TIMCTRL1);
+	writel(TIMCTRL_UPDATE, timer_base + TIMCTRL1);
+	writel(0x0000ffff, timer_base + TIMCOUNT1);
+
+	writel(TIMCTRL_UPDATE | TIMCTRL_RELOAD | TIMCTRL_PRESCALE(0) | TIMCTRL_SELECT(8), timer_base + TIMCTRL1);
+	cs.mult = clocksource_hz2mult(CLOCK_TICK_RATE/*imx_get_xclk()*/, cs.shift);
+	init_clock(&cs);
+
+	clock_register_client(&imx23_clock_notifier);
+	return 0;
+}
+
+core_initcall(clocksource_init);