1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright (C) 2009 Samsung Electronics 3*4882a593Smuzhiyun * Heungjun Kim <riverful.kim@samsung.com> 4*4882a593Smuzhiyun * Inki Dae <inki.dae@samsung.com> 5*4882a593Smuzhiyun * Minkyu Kang <mk7.kang@samsung.com> 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <common.h> 11*4882a593Smuzhiyun #include <div64.h> 12*4882a593Smuzhiyun #include <asm/io.h> 13*4882a593Smuzhiyun #include <asm/arch/pwm.h> 14*4882a593Smuzhiyun #include <asm/arch/clk.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* Use the old PWM interface for now */ 17*4882a593Smuzhiyun #undef CONFIG_DM_PWM 18*4882a593Smuzhiyun #include <pwm.h> 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR; 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun unsigned long get_current_tick(void); 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun /* macro to read the 16 bit timer */ s5p_get_base_timer(void)25*4882a593Smuzhiyunstatic inline struct s5p_timer *s5p_get_base_timer(void) 26*4882a593Smuzhiyun { 27*4882a593Smuzhiyun return (struct s5p_timer *)samsung_get_base_timer(); 28*4882a593Smuzhiyun } 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun /** 31*4882a593Smuzhiyun * Read the countdown timer. 32*4882a593Smuzhiyun * 33*4882a593Smuzhiyun * This operates at 1MHz and counts downwards. It will wrap about every 34*4882a593Smuzhiyun * hour (2^32 microseconds). 35*4882a593Smuzhiyun * 36*4882a593Smuzhiyun * @return current value of timer 37*4882a593Smuzhiyun */ timer_get_us_down(void)38*4882a593Smuzhiyunstatic unsigned long timer_get_us_down(void) 39*4882a593Smuzhiyun { 40*4882a593Smuzhiyun struct s5p_timer *const timer = s5p_get_base_timer(); 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun return readl(&timer->tcnto4); 43*4882a593Smuzhiyun } 44*4882a593Smuzhiyun timer_init(void)45*4882a593Smuzhiyunint timer_init(void) 46*4882a593Smuzhiyun { 47*4882a593Smuzhiyun /* PWM Timer 4 */ 48*4882a593Smuzhiyun pwm_init(4, MUX_DIV_4, 0); 49*4882a593Smuzhiyun pwm_config(4, 100000, 100000); 50*4882a593Smuzhiyun pwm_enable(4); 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun /* Use this as the current monotonic time in us */ 53*4882a593Smuzhiyun gd->arch.timer_reset_value = 0; 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun /* Use this as the last timer value we saw */ 56*4882a593Smuzhiyun gd->arch.lastinc = timer_get_us_down(); 57*4882a593Smuzhiyun reset_timer_masked(); 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun return 0; 60*4882a593Smuzhiyun } 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun /* 63*4882a593Smuzhiyun * timer without interrupts 64*4882a593Smuzhiyun */ get_timer(unsigned long base)65*4882a593Smuzhiyununsigned long get_timer(unsigned long base) 66*4882a593Smuzhiyun { 67*4882a593Smuzhiyun unsigned long long time_ms; 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun ulong now = timer_get_us_down(); 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun /* 72*4882a593Smuzhiyun * Increment the time by the amount elapsed since the last read. 73*4882a593Smuzhiyun * The timer may have wrapped around, but it makes no difference to 74*4882a593Smuzhiyun * our arithmetic here. 75*4882a593Smuzhiyun */ 76*4882a593Smuzhiyun gd->arch.timer_reset_value += gd->arch.lastinc - now; 77*4882a593Smuzhiyun gd->arch.lastinc = now; 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun /* Divide by 1000 to convert from us to ms */ 80*4882a593Smuzhiyun time_ms = gd->arch.timer_reset_value; 81*4882a593Smuzhiyun do_div(time_ms, 1000); 82*4882a593Smuzhiyun return time_ms - base; 83*4882a593Smuzhiyun } 84*4882a593Smuzhiyun timer_get_us(void)85*4882a593Smuzhiyununsigned long __attribute__((no_instrument_function)) timer_get_us(void) 86*4882a593Smuzhiyun { 87*4882a593Smuzhiyun static unsigned long base_time_us; 88*4882a593Smuzhiyun 89*4882a593Smuzhiyun struct s5p_timer *const timer = 90*4882a593Smuzhiyun (struct s5p_timer *)samsung_get_base_timer(); 91*4882a593Smuzhiyun unsigned long now_downward_us = readl(&timer->tcnto4); 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun if (!base_time_us) 94*4882a593Smuzhiyun base_time_us = now_downward_us; 95*4882a593Smuzhiyun 96*4882a593Smuzhiyun /* Note that this timer counts downward. */ 97*4882a593Smuzhiyun return base_time_us - now_downward_us; 98*4882a593Smuzhiyun } 99*4882a593Smuzhiyun 100*4882a593Smuzhiyun /* delay x useconds */ __udelay(unsigned long usec)101*4882a593Smuzhiyunvoid __udelay(unsigned long usec) 102*4882a593Smuzhiyun { 103*4882a593Smuzhiyun unsigned long count_value; 104*4882a593Smuzhiyun 105*4882a593Smuzhiyun count_value = timer_get_us_down(); 106*4882a593Smuzhiyun while ((int)(count_value - timer_get_us_down()) < (int)usec) 107*4882a593Smuzhiyun ; 108*4882a593Smuzhiyun } 109*4882a593Smuzhiyun reset_timer_masked(void)110*4882a593Smuzhiyunvoid reset_timer_masked(void) 111*4882a593Smuzhiyun { 112*4882a593Smuzhiyun struct s5p_timer *const timer = s5p_get_base_timer(); 113*4882a593Smuzhiyun 114*4882a593Smuzhiyun /* reset time */ 115*4882a593Smuzhiyun gd->arch.lastinc = readl(&timer->tcnto4); 116*4882a593Smuzhiyun gd->arch.tbl = 0; 117*4882a593Smuzhiyun } 118*4882a593Smuzhiyun 119*4882a593Smuzhiyun /* 120*4882a593Smuzhiyun * This function is derived from PowerPC code (read timebase as long long). 121*4882a593Smuzhiyun * On ARM it just returns the timer value. 122*4882a593Smuzhiyun */ get_ticks(void)123*4882a593Smuzhiyununsigned long long get_ticks(void) 124*4882a593Smuzhiyun { 125*4882a593Smuzhiyun return get_timer(0); 126*4882a593Smuzhiyun } 127*4882a593Smuzhiyun 128*4882a593Smuzhiyun /* 129*4882a593Smuzhiyun * This function is derived from PowerPC code (timebase clock frequency). 130*4882a593Smuzhiyun * On ARM it returns the number of timer ticks per second. 131*4882a593Smuzhiyun */ get_tbclk(void)132*4882a593Smuzhiyununsigned long get_tbclk(void) 133*4882a593Smuzhiyun { 134*4882a593Smuzhiyun return CONFIG_SYS_HZ; 135*4882a593Smuzhiyun } 136