mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-03 18:10:13 +00:00
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2009 Samsung Electronics
|
|
* Heungjun Kim <riverful.kim@samsung.com>
|
|
* Inki Dae <inki.dae@samsung.com>
|
|
* Minkyu Kang <mk7.kang@samsung.com>
|
|
*
|
|
* 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/pwm.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <pwm.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* macro to read the 16 bit timer */
|
|
static inline struct s5p_timer *s5p_get_base_timer(void)
|
|
{
|
|
return (struct s5p_timer *)samsung_get_base_timer();
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
/* PWM Timer 4 */
|
|
pwm_init(4, MUX_DIV_2, 0);
|
|
pwm_config(4, 0, 0);
|
|
pwm_enable(4);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
unsigned long get_timer(unsigned long base)
|
|
{
|
|
return get_timer_masked() - base;
|
|
}
|
|
|
|
/* delay x useconds */
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
struct s5p_timer *const timer = s5p_get_base_timer();
|
|
unsigned long tmo, tmp, count_value;
|
|
|
|
count_value = readl(&timer->tcntb4);
|
|
|
|
if (usec >= 1000) {
|
|
/*
|
|
* if "big" number, spread normalization
|
|
* to seconds
|
|
* 1. start to normalize for usec to ticks per sec
|
|
* 2. find number of "ticks" to wait to achieve target
|
|
* 3. finish normalize.
|
|
*/
|
|
tmo = usec / 1000;
|
|
tmo *= (CONFIG_SYS_HZ * count_value / 10);
|
|
tmo /= 1000;
|
|
} else {
|
|
/* else small number, don't kill it prior to HZ multiply */
|
|
tmo = usec * CONFIG_SYS_HZ * count_value / 10;
|
|
tmo /= (1000 * 1000);
|
|
}
|
|
|
|
/* get current timestamp */
|
|
tmp = get_timer(0);
|
|
|
|
/* if setting this fordward will roll time stamp */
|
|
/* reset "advancing" timestamp to 0, set lastinc value */
|
|
/* else, set advancing stamp wake up time */
|
|
if ((tmo + tmp + 1) < tmp)
|
|
reset_timer_masked();
|
|
else
|
|
tmo += tmp;
|
|
|
|
/* loop till event */
|
|
while (get_timer_masked() < tmo)
|
|
; /* nop */
|
|
}
|
|
|
|
void reset_timer_masked(void)
|
|
{
|
|
struct s5p_timer *const timer = s5p_get_base_timer();
|
|
|
|
/* reset time */
|
|
gd->lastinc = readl(&timer->tcnto4);
|
|
gd->tbl = 0;
|
|
}
|
|
|
|
unsigned long get_timer_masked(void)
|
|
{
|
|
struct s5p_timer *const timer = s5p_get_base_timer();
|
|
unsigned long now = readl(&timer->tcnto4);
|
|
unsigned long count_value = readl(&timer->tcntb4);
|
|
|
|
if (gd->lastinc >= now)
|
|
gd->tbl += gd->lastinc - now;
|
|
else
|
|
gd->tbl += gd->lastinc + count_value - now;
|
|
|
|
gd->lastinc = now;
|
|
|
|
return gd->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.
|
|
*/
|
|
unsigned long get_tbclk(void)
|
|
{
|
|
return CONFIG_SYS_HZ;
|
|
}
|