1 files changed, 119 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx51/timer.c b/arch/arm/cpu/armv7/mx51/timer.c
new file mode 100644
index 0000000..81c4a06
--- /dev/null
+++ b/arch/arm/cpu/armv7/mx51/timer.c
@@ -0,0 +1,119 @@
+/*
+ * (C) Copyright 2007
+ * Sascha Hauer, Pengutronix
+ *
+ * (C) Copyright 2009 Freescale Semiconductor, Inc.
+ *
+ * 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/io.h>
+#include <asm/arch/imx-regs.h>
+
+/* General purpose timers registers */
+struct mxc_gpt {
+	unsigned int control;
+	unsigned int prescaler;
+	unsigned int status;
+	unsigned int nouse[6];
+	unsigned int counter;
+};
+
+static struct mxc_gpt *cur_gpt = (struct mxc_gpt *)GPT1_BASE_ADDR;
+
+/* General purpose timers bitfields */
+#define GPTCR_SWR       (1<<15)	/* Software reset */
+#define GPTCR_FRR       (1<<9)	/* Freerun / restart */
+#define GPTCR_CLKSOURCE_32 (4<<6)	/* Clock source */
+#define GPTCR_TEN       (1)	/* Timer enable */
+
+static ulong timestamp;
+static ulong lastinc;
+
+int timer_init(void)
+{
+	int i;
+
+	/* setup GP Timer 1 */
+	__raw_writel(GPTCR_SWR, &cur_gpt->control);
+
+	/* We have no udelay by now */
+	for (i = 0; i < 100; i++)
+		__raw_writel(0, &cur_gpt->control);
+
+	__raw_writel(0, &cur_gpt->prescaler); /* 32Khz */
+
+	/* Freerun Mode, PERCLK1 input */
+	i = __raw_readl(&cur_gpt->control);
+	__raw_writel(i | GPTCR_CLKSOURCE_32 | GPTCR_TEN, &cur_gpt->control);
+	reset_timer_masked();
+	return 0;
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+void reset_timer_masked(void)
+{
+	ulong val = __raw_readl(&cur_gpt->counter);
+	lastinc = val / (CONFIG_MX51_CLK32 / CONFIG_SYS_HZ);
+	timestamp = 0;
+}
+
+ulong get_timer_masked(void)
+{
+	ulong val = __raw_readl(&cur_gpt->counter);
+	val /= (CONFIG_MX51_CLK32 / CONFIG_SYS_HZ);
+	if (val >= lastinc)
+		timestamp += (val - lastinc);
+	else
+		timestamp += ((0xFFFFFFFF / (CONFIG_MX51_CLK32 / CONFIG_SYS_HZ))
+				- lastinc) + val;
+	lastinc = val;
+	return val;
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay(unsigned long usec)
+{
+	unsigned long now, start, tmo;
+	tmo = usec * (CONFIG_MX51_CLK32 / 1000) / 1000;
+
+	if (!tmo)
+		tmo = 1;
+
+	now = start = readl(&cur_gpt->counter);
+
+	while ((now - start) < tmo)
+		now = readl(&cur_gpt->counter);
+
+}