These functions provide access to the high resolution microsecond timer and tidy up a global variable in the code.
Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v3: - Remove future time function - No microsecond timing changes as I am unsure of the state of this in U-Boot
arch/arm/cpu/armv7/tegra2/timer.c | 18 ++++++++++----- arch/arm/include/asm/arch-tegra2/timer.h | 34 ++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 6 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 0b9fa64..b12b12c 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 */ @@ -57,10 +56,10 @@ ulong get_timer(ulong base) 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 @@ -74,7 +73,7 @@ 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 */ @@ -103,3 +102,10 @@ 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); +} 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 +