mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 05:42:58 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*
|
|
* (C) Copyright 2010,2011
|
|
* NVIDIA Corporation <www.nvidia.com>
|
|
*
|
|
* (C) Copyright 2008
|
|
* Texas Instruments
|
|
*
|
|
* Richard Woodruff <r-woodruff2@ti.com>
|
|
* Syed Moahmmed Khasim <khasim@ti.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/tegra.h>
|
|
#include <asm/arch-tegra/timer.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* counter runs at 1MHz */
|
|
#define TIMER_CLK 1000000
|
|
#define TIMER_LOAD_VAL 0xffffffff
|
|
|
|
/* timer without interrupts */
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return get_timer_masked() - base;
|
|
}
|
|
|
|
/* delay x useconds */
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
long tmo = usec * (TIMER_CLK / 1000) / 1000;
|
|
unsigned long now, last = timer_get_us();
|
|
|
|
while (tmo > 0) {
|
|
now = timer_get_us();
|
|
if (last > now) /* count up timer overflow */
|
|
tmo -= TIMER_LOAD_VAL - last + now;
|
|
else
|
|
tmo -= now - last;
|
|
last = now;
|
|
}
|
|
}
|
|
|
|
ulong get_timer_masked(void)
|
|
{
|
|
ulong now;
|
|
|
|
/* current tick value */
|
|
now = timer_get_us() / (TIMER_CLK / CONFIG_SYS_HZ);
|
|
|
|
if (now >= gd->arch.lastinc) /* normal mode (non roll) */
|
|
/* move stamp forward with absolute diff ticks */
|
|
gd->arch.tbl += (now - gd->arch.lastinc);
|
|
else /* we have rollover of incrementer */
|
|
gd->arch.tbl += ((TIMER_LOAD_VAL / (TIMER_CLK / CONFIG_SYS_HZ))
|
|
- gd->arch.lastinc) + now;
|
|
gd->arch.lastinc = now;
|
|
return gd->arch.tbl;
|
|
}
|
|
|
|
/*
|
|
* This function is derived from PowerPC code (read timebase as long long).
|
|
* On ARM it just returns the timer value.
|
|
*/
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
return get_timer(0);
|
|
}
|
|
|
|
/*
|
|
* This function is derived from PowerPC code (timebase clock frequency).
|
|
* On ARM it returns the number of timer ticks per second.
|
|
*/
|
|
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);
|
|
}
|