mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 17:07:38 +00:00
157 lines
3 KiB
C
157 lines
3 KiB
C
/*
|
|
* (C) Copyright 2009
|
|
* Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
|
|
*
|
|
* (C) Copyright 2007-2010
|
|
* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
|
|
*
|
|
* (C) Copyright 2003
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* 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 <div64.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/clk.h>
|
|
#include <asm/io.h>
|
|
|
|
#define TMU_MAX_COUNTER (~0UL)
|
|
|
|
static ulong timer_freq;
|
|
static unsigned long last_tcnt;
|
|
static unsigned long long overflow_ticks;
|
|
|
|
static inline unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
tick *= CONFIG_SYS_HZ;
|
|
do_div(tick, timer_freq);
|
|
|
|
return tick;
|
|
}
|
|
|
|
static inline unsigned long long usec_to_tick(unsigned long long usec)
|
|
{
|
|
usec *= timer_freq;
|
|
do_div(usec, 1000000);
|
|
|
|
return usec;
|
|
}
|
|
|
|
static void tmu_timer_start (unsigned int timer)
|
|
{
|
|
if (timer > 2)
|
|
return;
|
|
writeb(readb(TSTR) | (1 << timer), TSTR);
|
|
}
|
|
|
|
static void tmu_timer_stop (unsigned int timer)
|
|
{
|
|
if (timer > 2)
|
|
return;
|
|
writeb(readb(TSTR) & ~(1 << timer), TSTR);
|
|
}
|
|
|
|
int timer_init (void)
|
|
{
|
|
/* Divide clock by CONFIG_SYS_TMU_CLK_DIV */
|
|
u16 bit = 0;
|
|
|
|
switch (CONFIG_SYS_TMU_CLK_DIV) {
|
|
case 1024:
|
|
bit = 4;
|
|
break;
|
|
case 256:
|
|
bit = 3;
|
|
break;
|
|
case 64:
|
|
bit = 2;
|
|
break;
|
|
case 16:
|
|
bit = 1;
|
|
break;
|
|
case 4:
|
|
default:
|
|
break;
|
|
}
|
|
writew(readw(TCR0) | bit, TCR0);
|
|
|
|
/* Calc clock rate */
|
|
timer_freq = get_tmu0_clk_rate() >> ((bit + 1) * 2);
|
|
|
|
tmu_timer_stop(0);
|
|
tmu_timer_start(0);
|
|
|
|
last_tcnt = 0;
|
|
overflow_ticks = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long long get_ticks (void)
|
|
{
|
|
unsigned long tcnt = 0 - readl(TCNT0);
|
|
unsigned long ticks;
|
|
|
|
if (last_tcnt > tcnt) { /* overflow */
|
|
overflow_ticks++;
|
|
ticks = (0xffffffff - last_tcnt) + tcnt;
|
|
} else {
|
|
ticks = tcnt;
|
|
}
|
|
last_tcnt = tcnt;
|
|
|
|
return (overflow_ticks << 32) | tcnt;
|
|
}
|
|
|
|
void __udelay (unsigned long usec)
|
|
{
|
|
unsigned long long tmp;
|
|
ulong tmo;
|
|
|
|
tmo = usec_to_tick(usec);
|
|
tmp = get_ticks() + tmo; /* get current timestamp */
|
|
|
|
while (get_ticks() < tmp) /* loop till event */
|
|
/*NOP*/;
|
|
}
|
|
|
|
unsigned long get_timer (unsigned long base)
|
|
{
|
|
/* return msec */
|
|
return tick_to_time(get_ticks()) - base;
|
|
}
|
|
|
|
void set_timer (unsigned long t)
|
|
{
|
|
writel((0 - t), TCNT0);
|
|
}
|
|
|
|
void reset_timer (void)
|
|
{
|
|
tmu_timer_stop(0);
|
|
set_timer (0);
|
|
tmu_timer_start(0);
|
|
}
|
|
|
|
unsigned long get_tbclk (void)
|
|
{
|
|
return timer_freq;
|
|
}
|