mirror of
https://github.com/AsahiLinux/u-boot
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140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/*
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* Copyright (C) 2009 Samsung Electronics
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* Heungjun Kim <riverful.kim@samsung.com>
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* Inki Dae <inki.dae@samsung.com>
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* Minkyu Kang <mk7.kang@samsung.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/pwm.h>
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#include <asm/arch/clk.h>
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#include <pwm.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* macro to read the 16 bit timer */
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static inline struct s5p_timer *s5p_get_base_timer(void)
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{
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return (struct s5p_timer *)samsung_get_base_timer();
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}
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int timer_init(void)
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{
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/* PWM Timer 4 */
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pwm_init(4, MUX_DIV_2, 0);
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pwm_config(4, 0, 0);
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pwm_enable(4);
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return 0;
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}
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/*
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* timer without interrupts
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*/
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unsigned long get_timer(unsigned long base)
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{
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return get_timer_masked() - base;
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}
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/* delay x useconds */
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void __udelay(unsigned long usec)
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{
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struct s5p_timer *const timer = s5p_get_base_timer();
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unsigned long tmo, tmp, count_value;
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count_value = readl(&timer->tcntb4);
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if (usec >= 1000) {
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/*
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* if "big" number, spread normalization
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* to seconds
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* 1. start to normalize for usec to ticks per sec
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* 2. find number of "ticks" to wait to achieve target
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* 3. finish normalize.
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*/
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tmo = usec / 1000;
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tmo *= (CONFIG_SYS_HZ * count_value / 10);
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tmo /= 1000;
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} else {
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/* else small number, don't kill it prior to HZ multiply */
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tmo = usec * CONFIG_SYS_HZ * count_value / 10;
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tmo /= (1000 * 1000);
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}
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/* get current timestamp */
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tmp = get_timer(0);
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/* if setting this fordward will roll time stamp */
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/* reset "advancing" timestamp to 0, set lastinc value */
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/* else, set advancing stamp wake up time */
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if ((tmo + tmp + 1) < tmp)
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reset_timer_masked();
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else
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tmo += tmp;
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/* loop till event */
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while (get_timer_masked() < tmo)
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; /* nop */
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}
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void reset_timer_masked(void)
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{
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struct s5p_timer *const timer = s5p_get_base_timer();
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/* reset time */
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gd->lastinc = readl(&timer->tcnto4);
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gd->tbl = 0;
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}
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unsigned long get_timer_masked(void)
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{
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struct s5p_timer *const timer = s5p_get_base_timer();
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unsigned long now = readl(&timer->tcnto4);
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unsigned long count_value = readl(&timer->tcntb4);
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if (gd->lastinc >= now)
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gd->tbl += gd->lastinc - now;
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else
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gd->tbl += gd->lastinc + count_value - now;
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gd->lastinc = now;
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return gd->tbl;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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unsigned long get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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