Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 2 | /* |
| 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 Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <common.h> |
Simon Glass | c34c0ed | 2013-04-13 04:26:41 +0000 | [diff] [blame] | 10 | #include <div64.h> |
Simon Glass | 9758973 | 2020-05-10 11:40:02 -0600 | [diff] [blame] | 11 | #include <init.h> |
Simon Glass | 495a5dc | 2019-11-14 12:57:30 -0700 | [diff] [blame] | 12 | #include <time.h> |
Simon Glass | 3ba929a | 2020-10-30 21:38:53 -0600 | [diff] [blame] | 13 | #include <asm/global_data.h> |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 14 | #include <asm/io.h> |
| 15 | #include <asm/arch/pwm.h> |
| 16 | #include <asm/arch/clk.h> |
Simon Glass | dbd7954 | 2020-05-10 11:40:11 -0600 | [diff] [blame] | 17 | #include <linux/delay.h> |
Simon Glass | 636bf17 | 2016-02-21 21:08:49 -0700 | [diff] [blame] | 18 | |
| 19 | /* Use the old PWM interface for now */ |
| 20 | #undef CONFIG_DM_PWM |
Minkyu Kang | da0bff8 | 2011-03-10 20:05:58 +0900 | [diff] [blame] | 21 | #include <pwm.h> |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 22 | |
Minkyu Kang | 4cb7fbf | 2011-03-16 20:09:20 +0900 | [diff] [blame] | 23 | DECLARE_GLOBAL_DATA_PTR; |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 24 | |
Zhong Hongbo | e7c50c2 | 2012-07-02 13:50:49 +0000 | [diff] [blame] | 25 | unsigned long get_current_tick(void); |
Patrick Delaunay | e60765f | 2018-10-05 11:33:50 +0200 | [diff] [blame] | 26 | static void reset_timer_masked(void); |
Zhong Hongbo | e7c50c2 | 2012-07-02 13:50:49 +0000 | [diff] [blame] | 27 | |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 28 | /* macro to read the 16 bit timer */ |
Minkyu Kang | 2917c0a | 2010-08-19 20:41:50 +0900 | [diff] [blame] | 29 | static inline struct s5p_timer *s5p_get_base_timer(void) |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 30 | { |
Minkyu Kang | 2917c0a | 2010-08-19 20:41:50 +0900 | [diff] [blame] | 31 | return (struct s5p_timer *)samsung_get_base_timer(); |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 32 | } |
| 33 | |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 34 | /** |
| 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 Schuchardt | 47b4c02 | 2022-01-19 18:05:50 +0100 | [diff] [blame] | 40 | * Return: current value of timer |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 41 | */ |
| 42 | static 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 Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 49 | int timer_init(void) |
| 50 | { |
Minkyu Kang | da0bff8 | 2011-03-10 20:05:58 +0900 | [diff] [blame] | 51 | /* PWM Timer 4 */ |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 52 | pwm_init(4, MUX_DIV_4, 0); |
Gabe Black | ee85f24 | 2013-03-28 04:32:19 +0000 | [diff] [blame] | 53 | pwm_config(4, 100000, 100000); |
Minkyu Kang | da0bff8 | 2011-03-10 20:05:58 +0900 | [diff] [blame] | 54 | pwm_enable(4); |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 55 | |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 56 | /* 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 Hongbo | e7c50c2 | 2012-07-02 13:50:49 +0000 | [diff] [blame] | 61 | reset_timer_masked(); |
| 62 | |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * timer without interrupts |
| 68 | */ |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 69 | unsigned long get_timer(unsigned long base) |
| 70 | { |
Simon Glass | c34c0ed | 2013-04-13 04:26:41 +0000 | [diff] [blame] | 71 | unsigned long long time_ms; |
| 72 | |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 73 | 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 Glass | c34c0ed | 2013-04-13 04:26:41 +0000 | [diff] [blame] | 84 | time_ms = gd->arch.timer_reset_value; |
| 85 | do_div(time_ms, 1000); |
| 86 | return time_ms - base; |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 87 | } |
| 88 | |
Simon Glass | abf0995 | 2013-06-11 11:14:50 -0700 | [diff] [blame] | 89 | unsigned long __attribute__((no_instrument_function)) timer_get_us(void) |
Che-Liang Chiou | 94f61a3 | 2013-03-28 04:32:17 +0000 | [diff] [blame] | 90 | { |
| 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 Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 104 | /* delay x useconds */ |
Ingo van Lil | f0f778a | 2009-11-24 14:09:21 +0100 | [diff] [blame] | 105 | void __udelay(unsigned long usec) |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 106 | { |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 107 | unsigned long count_value; |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 108 | |
Simon Glass | a9e9abb | 2013-03-28 04:32:16 +0000 | [diff] [blame] | 109 | count_value = timer_get_us_down(); |
| 110 | while ((int)(count_value - timer_get_us_down()) < (int)usec) |
| 111 | ; |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 112 | } |
| 113 | |
Patrick Delaunay | e60765f | 2018-10-05 11:33:50 +0200 | [diff] [blame] | 114 | static void reset_timer_masked(void) |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 115 | { |
Minkyu Kang | 2917c0a | 2010-08-19 20:41:50 +0900 | [diff] [blame] | 116 | struct s5p_timer *const timer = s5p_get_base_timer(); |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 117 | |
| 118 | /* reset time */ |
Simon Glass | a848da5 | 2012-12-13 20:48:35 +0000 | [diff] [blame] | 119 | gd->arch.lastinc = readl(&timer->tcnto4); |
Simon Glass | 2655ee1 | 2012-12-13 20:48:34 +0000 | [diff] [blame] | 120 | gd->arch.tbl = 0; |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 121 | } |
| 122 | |
Minkyu Kang | 8764998 | 2009-10-01 17:20:01 +0900 | [diff] [blame] | 123 | /* |
| 124 | * This function is derived from PowerPC code (read timebase as long long). |
| 125 | * On ARM it just returns the timer value. |
| 126 | */ |
| 127 | unsigned 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 | */ |
| 136 | unsigned long get_tbclk(void) |
| 137 | { |
| 138 | return CONFIG_SYS_HZ; |
| 139 | } |