2 * Copyright (C) 2009 Samsung Electronics
3 * Heungjun Kim <riverful.kim@samsung.com>
4 * Inki Dae <inki.dae@samsung.com>
5 * Minkyu Kang <mk7.kang@samsung.com>
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/arch/pwm.h>
29 #include <asm/arch/clk.h>
32 DECLARE_GLOBAL_DATA_PTR;
34 /* macro to read the 16 bit timer */
35 static inline struct s5p_timer *s5p_get_base_timer(void)
37 return (struct s5p_timer *)samsung_get_base_timer();
43 pwm_init(4, MUX_DIV_2, 0);
51 * timer without interrupts
53 void reset_timer(void)
58 unsigned long get_timer(unsigned long base)
60 return get_timer_masked() - base;
63 void set_timer(unsigned long t)
68 /* delay x useconds */
69 void __udelay(unsigned long usec)
71 struct s5p_timer *const timer = s5p_get_base_timer();
72 unsigned long tmo, tmp, count_value;
74 count_value = readl(&timer->tcntb4);
78 * if "big" number, spread normalization
80 * 1. start to normalize for usec to ticks per sec
81 * 2. find number of "ticks" to wait to achieve target
82 * 3. finish normalize.
85 tmo *= (CONFIG_SYS_HZ * count_value / 10);
88 /* else small number, don't kill it prior to HZ multiply */
89 tmo = usec * CONFIG_SYS_HZ * count_value / 10;
93 /* get current timestamp */
96 /* if setting this fordward will roll time stamp */
97 /* reset "advancing" timestamp to 0, set lastinc value */
98 /* else, set advancing stamp wake up time */
99 if ((tmo + tmp + 1) < tmp)
100 reset_timer_masked();
104 /* loop till event */
105 while (get_timer_masked() < tmo)
109 void reset_timer_masked(void)
111 struct s5p_timer *const timer = s5p_get_base_timer();
114 gd->lastinc = readl(&timer->tcnto4);
118 unsigned long get_timer_masked(void)
120 struct s5p_timer *const timer = s5p_get_base_timer();
121 unsigned long now = readl(&timer->tcnto4);
122 unsigned long count_value = readl(&timer->tcntb4);
124 if (gd->lastinc >= now)
125 gd->tbl += gd->lastinc - now;
127 gd->tbl += gd->lastinc + count_value - now;
135 * This function is derived from PowerPC code (read timebase as long long).
136 * On ARM it just returns the timer value.
138 unsigned long long get_ticks(void)
144 * This function is derived from PowerPC code (timebase clock frequency).
145 * On ARM it returns the number of timer ticks per second.
147 unsigned long get_tbclk(void)
149 return CONFIG_SYS_HZ;