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 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/arch/pwm.h>
14 #include <asm/arch/clk.h>
16 /* Use the old PWM interface for now */
20 DECLARE_GLOBAL_DATA_PTR;
22 unsigned long get_current_tick(void);
24 /* macro to read the 16 bit timer */
25 static inline struct s5p_timer *s5p_get_base_timer(void)
27 return (struct s5p_timer *)samsung_get_base_timer();
31 * Read the countdown timer.
33 * This operates at 1MHz and counts downwards. It will wrap about every
34 * hour (2^32 microseconds).
36 * @return current value of timer
38 static unsigned long timer_get_us_down(void)
40 struct s5p_timer *const timer = s5p_get_base_timer();
42 return readl(&timer->tcnto4);
48 pwm_init(4, MUX_DIV_4, 0);
49 pwm_config(4, 100000, 100000);
52 /* Use this as the current monotonic time in us */
53 gd->arch.timer_reset_value = 0;
55 /* Use this as the last timer value we saw */
56 gd->arch.lastinc = timer_get_us_down();
63 * timer without interrupts
65 unsigned long get_timer(unsigned long base)
67 unsigned long long time_ms;
69 ulong now = timer_get_us_down();
72 * Increment the time by the amount elapsed since the last read.
73 * The timer may have wrapped around, but it makes no difference to
74 * our arithmetic here.
76 gd->arch.timer_reset_value += gd->arch.lastinc - now;
77 gd->arch.lastinc = now;
79 /* Divide by 1000 to convert from us to ms */
80 time_ms = gd->arch.timer_reset_value;
81 do_div(time_ms, 1000);
82 return time_ms - base;
85 unsigned long __attribute__((no_instrument_function)) timer_get_us(void)
87 static unsigned long base_time_us;
89 struct s5p_timer *const timer =
90 (struct s5p_timer *)samsung_get_base_timer();
91 unsigned long now_downward_us = readl(&timer->tcnto4);
94 base_time_us = now_downward_us;
96 /* Note that this timer counts downward. */
97 return base_time_us - now_downward_us;
100 /* delay x useconds */
101 void __udelay(unsigned long usec)
103 unsigned long count_value;
105 count_value = timer_get_us_down();
106 while ((int)(count_value - timer_get_us_down()) < (int)usec)
110 void reset_timer_masked(void)
112 struct s5p_timer *const timer = s5p_get_base_timer();
115 gd->arch.lastinc = readl(&timer->tcnto4);
120 * This function is derived from PowerPC code (read timebase as long long).
121 * On ARM it just returns the timer value.
123 unsigned long long get_ticks(void)
129 * This function is derived from PowerPC code (timebase clock frequency).
130 * On ARM it returns the number of timer ticks per second.
132 unsigned long get_tbclk(void)
134 return CONFIG_SYS_HZ;