These functions provide access to the high resolution microsecond timer
and tidy up a global variable in the code.
Signed-off-by: Simon Glass <s...@chromium.org>
---
arch/arm/cpu/armv7/tegra2/timer.c | 27 +++++++++++++++++------
arch/arm/include/asm/arch-tegra2/timer.h | 34 ++++++++++++++++++++++++++++++
2 files changed, 54 insertions(+), 7 deletions(-)
create mode 100644 arch/arm/include/asm/arch-tegra2/timer.h
diff --git a/arch/arm/cpu/armv7/tegra2/timer.c
b/arch/arm/cpu/armv7/tegra2/timer.c
index fb061d0..b69c172 100644
--- a/arch/arm/cpu/armv7/tegra2/timer.c
+++ b/arch/arm/cpu/armv7/tegra2/timer.c
@@ -38,13 +38,12 @@
#include <common.h>
#include <asm/io.h>
#include <asm/arch/tegra2.h>
+#include <asm/arch/timer.h>
DECLARE_GLOBAL_DATA_PTR;
-struct timerus *timer_base = (struct timerus *)NV_PA_TMRUS_BASE;
-
/* counter runs at 1MHz */
-#define TIMER_CLK (1000000)
+#define TIMER_CLK 1000000
#define TIMER_LOAD_VAL 0xffffffff
/* timer without interrupts */
@@ -67,10 +66,10 @@ void set_timer(ulong t)
void __udelay(unsigned long usec)
{
long tmo = usec * (TIMER_CLK / 1000) / 1000;
- unsigned long now, last = readl(&timer_base->cntr_1us);
+ unsigned long now, last = timer_get_us();
while (tmo > 0) {
- now = readl(&timer_base->cntr_1us);
+ now = timer_get_us();
if (last > now) /* count up timer overflow */
tmo -= TIMER_LOAD_VAL - last + now;
else
@@ -82,7 +81,7 @@ void __udelay(unsigned long usec)
void reset_timer_masked(void)
{
/* reset time, capture current incrementer value time */
- gd->lastinc = readl(&timer_base->cntr_1us) / (TIMER_CLK/CONFIG_SYS_HZ);
+ gd->lastinc = timer_get_us() / (TIMER_CLK/CONFIG_SYS_HZ);
gd->tbl = 0; /* start "advancing" time stamp from 0 */
}
@@ -91,7 +90,7 @@ ulong get_timer_masked(void)
ulong now;
/* current tick value */
- now = readl(&timer_base->cntr_1us) / (TIMER_CLK / CONFIG_SYS_HZ);
+ now = timer_get_us() / (TIMER_CLK / CONFIG_SYS_HZ);
if (now >= gd->lastinc) /* normal mode (non roll) */
/* move stamp forward with absolute diff ticks */
@@ -120,3 +119,17 @@ ulong get_tbclk(void)
{
return CONFIG_SYS_HZ;
}
+
+
+unsigned long timer_get_us(void)
+{
+ struct timerus *timer_base = (struct timerus *)NV_PA_TMRUS_BASE;
+
+ return readl(&timer_base->cntr_1us);
+}
+
+unsigned long timer_get_future_us(u32 delay)
+{
+ return timer_get_us() + delay;
+}
+
diff --git a/arch/arm/include/asm/arch-tegra2/timer.h
b/arch/arm/include/asm/arch-tegra2/timer.h
new file mode 100644
index 0000000..5d5445e
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra2/timer.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * 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
+ */
+
+/* Tegra2 timer functions */
+
+#ifndef _TEGRA2_TIMER_H
+#define _TEGRA2_TIMER_H
+
+/* returns the current monotonic timer value in microseconds */
+unsigned long timer_get_us(void);
+
+/* returns what the time will likely be some microseconds into the future */
+unsigned long timer_get_future_us(u32 delay);
+
+#endif
+
--
1.7.3.1
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
