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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2009 Samsung Electronics
- * Heungjun Kim <riverful.kim@samsung.com>
- * Inki Dae <inki.dae@samsung.com>
- * Minkyu Kang <mk7.kang@samsung.com>
- */
- #include <common.h>
- #include <div64.h>
- #include <init.h>
- #include <time.h>
- #include <asm/global_data.h>
- #include <asm/io.h>
- #include <asm/arch/pwm.h>
- #include <asm/arch/clk.h>
- #include <linux/delay.h>
- /* Use the old PWM interface for now */
- #undef CONFIG_DM_PWM
- #include <pwm.h>
- DECLARE_GLOBAL_DATA_PTR;
- unsigned long get_current_tick(void);
- static void reset_timer_masked(void);
- /* 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();
- }
- /**
- * Read the countdown timer.
- *
- * This operates at 1MHz and counts downwards. It will wrap about every
- * hour (2^32 microseconds).
- *
- * @return current value of timer
- */
- static unsigned long timer_get_us_down(void)
- {
- struct s5p_timer *const timer = s5p_get_base_timer();
- return readl(&timer->tcnto4);
- }
- int timer_init(void)
- {
- /* PWM Timer 4 */
- pwm_init(4, MUX_DIV_4, 0);
- pwm_config(4, 100000, 100000);
- pwm_enable(4);
- /* Use this as the current monotonic time in us */
- gd->arch.timer_reset_value = 0;
- /* Use this as the last timer value we saw */
- gd->arch.lastinc = timer_get_us_down();
- reset_timer_masked();
- return 0;
- }
- /*
- * timer without interrupts
- */
- unsigned long get_timer(unsigned long base)
- {
- unsigned long long time_ms;
- ulong now = timer_get_us_down();
- /*
- * Increment the time by the amount elapsed since the last read.
- * The timer may have wrapped around, but it makes no difference to
- * our arithmetic here.
- */
- gd->arch.timer_reset_value += gd->arch.lastinc - now;
- gd->arch.lastinc = now;
- /* Divide by 1000 to convert from us to ms */
- time_ms = gd->arch.timer_reset_value;
- do_div(time_ms, 1000);
- return time_ms - base;
- }
- unsigned long __attribute__((no_instrument_function)) timer_get_us(void)
- {
- static unsigned long base_time_us;
- struct s5p_timer *const timer =
- (struct s5p_timer *)samsung_get_base_timer();
- unsigned long now_downward_us = readl(&timer->tcnto4);
- if (!base_time_us)
- base_time_us = now_downward_us;
- /* Note that this timer counts downward. */
- return base_time_us - now_downward_us;
- }
- /* delay x useconds */
- void __udelay(unsigned long usec)
- {
- unsigned long count_value;
- count_value = timer_get_us_down();
- while ((int)(count_value - timer_get_us_down()) < (int)usec)
- ;
- }
- static void reset_timer_masked(void)
- {
- struct s5p_timer *const timer = s5p_get_base_timer();
- /* reset time */
- gd->arch.lastinc = readl(&timer->tcnto4);
- gd->arch.tbl = 0;
- }
- /*
- * 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;
- }
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