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Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Minkyu Kang87649982009-10-01 17:20:01 +09002/*
3 * Copyright (C) 2009 Samsung Electronics
4 * Heungjun Kim <riverful.kim@samsung.com>
5 * Inki Dae <inki.dae@samsung.com>
6 * Minkyu Kang <mk7.kang@samsung.com>
Minkyu Kang87649982009-10-01 17:20:01 +09007 */
8
9#include <common.h>
Simon Glassc34c0ed2013-04-13 04:26:41 +000010#include <div64.h>
Simon Glass97589732020-05-10 11:40:02 -060011#include <init.h>
Simon Glass495a5dc2019-11-14 12:57:30 -070012#include <time.h>
Simon Glass3ba929a2020-10-30 21:38:53 -060013#include <asm/global_data.h>
Minkyu Kang87649982009-10-01 17:20:01 +090014#include <asm/io.h>
15#include <asm/arch/pwm.h>
16#include <asm/arch/clk.h>
Simon Glassdbd79542020-05-10 11:40:11 -060017#include <linux/delay.h>
Simon Glass636bf172016-02-21 21:08:49 -070018
19/* Use the old PWM interface for now */
20#undef CONFIG_DM_PWM
Minkyu Kangda0bff82011-03-10 20:05:58 +090021#include <pwm.h>
Minkyu Kang87649982009-10-01 17:20:01 +090022
Minkyu Kang4cb7fbf2011-03-16 20:09:20 +090023DECLARE_GLOBAL_DATA_PTR;
Minkyu Kang87649982009-10-01 17:20:01 +090024
Zhong Hongboe7c50c22012-07-02 13:50:49 +000025unsigned long get_current_tick(void);
Patrick Delaunaye60765f2018-10-05 11:33:50 +020026static void reset_timer_masked(void);
Zhong Hongboe7c50c22012-07-02 13:50:49 +000027
Minkyu Kang87649982009-10-01 17:20:01 +090028/* macro to read the 16 bit timer */
Minkyu Kang2917c0a2010-08-19 20:41:50 +090029static inline struct s5p_timer *s5p_get_base_timer(void)
Minkyu Kang87649982009-10-01 17:20:01 +090030{
Minkyu Kang2917c0a2010-08-19 20:41:50 +090031 return (struct s5p_timer *)samsung_get_base_timer();
Minkyu Kang87649982009-10-01 17:20:01 +090032}
33
Simon Glassa9e9abb2013-03-28 04:32:16 +000034/**
35 * Read the countdown timer.
36 *
37 * This operates at 1MHz and counts downwards. It will wrap about every
38 * hour (2^32 microseconds).
39 *
Heinrich Schuchardt47b4c022022-01-19 18:05:50 +010040 * Return: current value of timer
Simon Glassa9e9abb2013-03-28 04:32:16 +000041 */
42static unsigned long timer_get_us_down(void)
43{
44 struct s5p_timer *const timer = s5p_get_base_timer();
45
46 return readl(&timer->tcnto4);
47}
48
Minkyu Kang87649982009-10-01 17:20:01 +090049int timer_init(void)
50{
Minkyu Kangda0bff82011-03-10 20:05:58 +090051 /* PWM Timer 4 */
Simon Glassa9e9abb2013-03-28 04:32:16 +000052 pwm_init(4, MUX_DIV_4, 0);
Gabe Blackee85f242013-03-28 04:32:19 +000053 pwm_config(4, 100000, 100000);
Minkyu Kangda0bff82011-03-10 20:05:58 +090054 pwm_enable(4);
Minkyu Kang87649982009-10-01 17:20:01 +090055
Simon Glassa9e9abb2013-03-28 04:32:16 +000056 /* Use this as the current monotonic time in us */
57 gd->arch.timer_reset_value = 0;
58
59 /* Use this as the last timer value we saw */
60 gd->arch.lastinc = timer_get_us_down();
Zhong Hongboe7c50c22012-07-02 13:50:49 +000061 reset_timer_masked();
62
Minkyu Kang87649982009-10-01 17:20:01 +090063 return 0;
64}
65
66/*
67 * timer without interrupts
68 */
Minkyu Kang87649982009-10-01 17:20:01 +090069unsigned long get_timer(unsigned long base)
70{
Simon Glassc34c0ed2013-04-13 04:26:41 +000071 unsigned long long time_ms;
72
Simon Glassa9e9abb2013-03-28 04:32:16 +000073 ulong now = timer_get_us_down();
74
75 /*
76 * Increment the time by the amount elapsed since the last read.
77 * The timer may have wrapped around, but it makes no difference to
78 * our arithmetic here.
79 */
80 gd->arch.timer_reset_value += gd->arch.lastinc - now;
81 gd->arch.lastinc = now;
82
83 /* Divide by 1000 to convert from us to ms */
Simon Glassc34c0ed2013-04-13 04:26:41 +000084 time_ms = gd->arch.timer_reset_value;
85 do_div(time_ms, 1000);
86 return time_ms - base;
Minkyu Kang87649982009-10-01 17:20:01 +090087}
88
Simon Glassabf09952013-06-11 11:14:50 -070089unsigned long __attribute__((no_instrument_function)) timer_get_us(void)
Che-Liang Chiou94f61a32013-03-28 04:32:17 +000090{
91 static unsigned long base_time_us;
92
93 struct s5p_timer *const timer =
94 (struct s5p_timer *)samsung_get_base_timer();
95 unsigned long now_downward_us = readl(&timer->tcnto4);
96
97 if (!base_time_us)
98 base_time_us = now_downward_us;
99
100 /* Note that this timer counts downward. */
101 return base_time_us - now_downward_us;
102}
103
Minkyu Kang87649982009-10-01 17:20:01 +0900104/* delay x useconds */
Ingo van Lilf0f778a2009-11-24 14:09:21 +0100105void __udelay(unsigned long usec)
Minkyu Kang87649982009-10-01 17:20:01 +0900106{
Simon Glassa9e9abb2013-03-28 04:32:16 +0000107 unsigned long count_value;
Minkyu Kang87649982009-10-01 17:20:01 +0900108
Simon Glassa9e9abb2013-03-28 04:32:16 +0000109 count_value = timer_get_us_down();
110 while ((int)(count_value - timer_get_us_down()) < (int)usec)
111 ;
Minkyu Kang87649982009-10-01 17:20:01 +0900112}
113
Patrick Delaunaye60765f2018-10-05 11:33:50 +0200114static void reset_timer_masked(void)
Minkyu Kang87649982009-10-01 17:20:01 +0900115{
Minkyu Kang2917c0a2010-08-19 20:41:50 +0900116 struct s5p_timer *const timer = s5p_get_base_timer();
Minkyu Kang87649982009-10-01 17:20:01 +0900117
118 /* reset time */
Simon Glassa848da52012-12-13 20:48:35 +0000119 gd->arch.lastinc = readl(&timer->tcnto4);
Simon Glass2655ee12012-12-13 20:48:34 +0000120 gd->arch.tbl = 0;
Minkyu Kang87649982009-10-01 17:20:01 +0900121}
122
Minkyu Kang87649982009-10-01 17:20:01 +0900123/*
124 * This function is derived from PowerPC code (read timebase as long long).
125 * On ARM it just returns the timer value.
126 */
127unsigned long long get_ticks(void)
128{
129 return get_timer(0);
130}
131
132/*
133 * This function is derived from PowerPC code (timebase clock frequency).
134 * On ARM it returns the number of timer ticks per second.
135 */
136unsigned long get_tbclk(void)
137{
138 return CONFIG_SYS_HZ;
139}