1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright 2013 Freescale Semiconductor, Inc. 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <common.h> 8*4882a593Smuzhiyun #include <asm/io.h> 9*4882a593Smuzhiyun #include <div64.h> 10*4882a593Smuzhiyun #include <asm/arch/imx-regs.h> 11*4882a593Smuzhiyun #include <asm/arch/clock.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR; 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR; 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #define TIMER_LOAD_VAL 0xffffffff 18*4882a593Smuzhiyun tick_to_time(unsigned long long tick)19*4882a593Smuzhiyunstatic inline unsigned long long tick_to_time(unsigned long long tick) 20*4882a593Smuzhiyun { 21*4882a593Smuzhiyun tick *= CONFIG_SYS_HZ; 22*4882a593Smuzhiyun do_div(tick, mxc_get_clock(MXC_IPG_CLK)); 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun return tick; 25*4882a593Smuzhiyun } 26*4882a593Smuzhiyun us_to_tick(unsigned long long usec)27*4882a593Smuzhiyunstatic inline unsigned long long us_to_tick(unsigned long long usec) 28*4882a593Smuzhiyun { 29*4882a593Smuzhiyun usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999; 30*4882a593Smuzhiyun do_div(usec, 1000000); 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun return usec; 33*4882a593Smuzhiyun } 34*4882a593Smuzhiyun timer_init(void)35*4882a593Smuzhiyunint timer_init(void) 36*4882a593Smuzhiyun { 37*4882a593Smuzhiyun __raw_writel(0, &cur_pit->mcr); 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun __raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1); 40*4882a593Smuzhiyun __raw_writel(0, &cur_pit->tctrl1); 41*4882a593Smuzhiyun __raw_writel(1, &cur_pit->tctrl1); 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun gd->arch.tbl = 0; 44*4882a593Smuzhiyun gd->arch.tbu = 0; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun return 0; 47*4882a593Smuzhiyun } 48*4882a593Smuzhiyun get_ticks(void)49*4882a593Smuzhiyununsigned long long get_ticks(void) 50*4882a593Smuzhiyun { 51*4882a593Smuzhiyun ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1); 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun /* increment tbu if tbl has rolled over */ 54*4882a593Smuzhiyun if (now < gd->arch.tbl) 55*4882a593Smuzhiyun gd->arch.tbu++; 56*4882a593Smuzhiyun gd->arch.tbl = now; 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl; 59*4882a593Smuzhiyun } 60*4882a593Smuzhiyun get_timer_masked(void)61*4882a593Smuzhiyunulong get_timer_masked(void) 62*4882a593Smuzhiyun { 63*4882a593Smuzhiyun return tick_to_time(get_ticks()); 64*4882a593Smuzhiyun } 65*4882a593Smuzhiyun get_timer(ulong base)66*4882a593Smuzhiyunulong get_timer(ulong base) 67*4882a593Smuzhiyun { 68*4882a593Smuzhiyun return get_timer_masked() - base; 69*4882a593Smuzhiyun } 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun /* delay x useconds AND preserve advance timstamp value */ __udelay(unsigned long usec)72*4882a593Smuzhiyunvoid __udelay(unsigned long usec) 73*4882a593Smuzhiyun { 74*4882a593Smuzhiyun unsigned long long start; 75*4882a593Smuzhiyun ulong tmo; 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun start = get_ticks(); /* get current timestamp */ 78*4882a593Smuzhiyun tmo = us_to_tick(usec); /* convert usecs to ticks */ 79*4882a593Smuzhiyun while ((get_ticks() - start) < tmo) 80*4882a593Smuzhiyun ; /* loop till time has passed */ 81*4882a593Smuzhiyun } 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun /* 84*4882a593Smuzhiyun * This function is derived from PowerPC code (timebase clock frequency). 85*4882a593Smuzhiyun * On ARM it returns the number of timer ticks per second. 86*4882a593Smuzhiyun */ get_tbclk(void)87*4882a593Smuzhiyunulong get_tbclk(void) 88*4882a593Smuzhiyun { 89*4882a593Smuzhiyun return mxc_get_clock(MXC_IPG_CLK); 90*4882a593Smuzhiyun } 91