183d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+ 2983e3700STom Rini /* 3983e3700STom Rini * (C) Copyright 2008 4983e3700STom Rini * Texas Instruments 5983e3700STom Rini * 6983e3700STom Rini * Richard Woodruff <r-woodruff2@ti.com> 7983e3700STom Rini * Syed Moahmmed Khasim <khasim@ti.com> 8983e3700STom Rini * 9983e3700STom Rini * (C) Copyright 2002 10983e3700STom Rini * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 11983e3700STom Rini * Marius Groeger <mgroeger@sysgo.de> 12983e3700STom Rini * Alex Zuepke <azu@sysgo.de> 13983e3700STom Rini * 14983e3700STom Rini * (C) Copyright 2002 15983e3700STom Rini * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> 16983e3700STom Rini */ 17983e3700STom Rini 18983e3700STom Rini #include <common.h> 19983e3700STom Rini #include <asm/io.h> 20983e3700STom Rini #include <asm/arch/cpu.h> 21983e3700STom Rini #include <asm/arch/clock.h> 22983e3700STom Rini 23983e3700STom Rini DECLARE_GLOBAL_DATA_PTR; 24983e3700STom Rini 25983e3700STom Rini static struct gptimer *timer_base = (struct gptimer *)CONFIG_SYS_TIMERBASE; 26*6180ea7eSPatrick Delaunay static ulong get_timer_masked(void); 27983e3700STom Rini 28983e3700STom Rini /* 29983e3700STom Rini * Nothing really to do with interrupts, just starts up a counter. 30983e3700STom Rini */ 31983e3700STom Rini 32983e3700STom Rini #define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV)) 33983e3700STom Rini #define TIMER_OVERFLOW_VAL 0xffffffff 34983e3700STom Rini #define TIMER_LOAD_VAL 0 35983e3700STom Rini timer_init(void)36983e3700STom Riniint timer_init(void) 37983e3700STom Rini { 38983e3700STom Rini /* start the counter ticking up, reload value on overflow */ 39983e3700STom Rini writel(TIMER_LOAD_VAL, &timer_base->tldr); 40983e3700STom Rini /* enable timer */ 41983e3700STom Rini writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST, 42983e3700STom Rini &timer_base->tclr); 43983e3700STom Rini 44983e3700STom Rini return 0; 45983e3700STom Rini } 46983e3700STom Rini 47983e3700STom Rini /* 48983e3700STom Rini * timer without interrupts 49983e3700STom Rini */ get_timer(ulong base)50983e3700STom Riniulong get_timer(ulong base) 51983e3700STom Rini { 52983e3700STom Rini return get_timer_masked() - base; 53983e3700STom Rini } 54983e3700STom Rini 55983e3700STom Rini /* delay x useconds */ __udelay(unsigned long usec)56983e3700STom Rinivoid __udelay(unsigned long usec) 57983e3700STom Rini { 58983e3700STom Rini long tmo = usec * (TIMER_CLOCK / 1000) / 1000; 59983e3700STom Rini unsigned long now, last = readl(&timer_base->tcrr); 60983e3700STom Rini 61983e3700STom Rini while (tmo > 0) { 62983e3700STom Rini now = readl(&timer_base->tcrr); 63983e3700STom Rini if (last > now) /* count up timer overflow */ 64983e3700STom Rini tmo -= TIMER_OVERFLOW_VAL - last + now + 1; 65983e3700STom Rini else 66983e3700STom Rini tmo -= now - last; 67983e3700STom Rini last = now; 68983e3700STom Rini } 69983e3700STom Rini } 70983e3700STom Rini get_timer_masked(void)71*6180ea7eSPatrick Delaunaystatic ulong get_timer_masked(void) 72983e3700STom Rini { 73983e3700STom Rini /* current tick value */ 74983e3700STom Rini ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ); 75983e3700STom Rini 76983e3700STom Rini if (now >= gd->arch.lastinc) { /* normal mode (non roll) */ 77983e3700STom Rini /* move stamp fordward with absoulte diff ticks */ 78983e3700STom Rini gd->arch.tbl += (now - gd->arch.lastinc); 79983e3700STom Rini } else { /* we have rollover of incrementer */ 80983e3700STom Rini gd->arch.tbl += ((TIMER_OVERFLOW_VAL / (TIMER_CLOCK / 81983e3700STom Rini CONFIG_SYS_HZ)) - gd->arch.lastinc) + now; 82983e3700STom Rini } 83983e3700STom Rini gd->arch.lastinc = now; 84983e3700STom Rini return gd->arch.tbl; 85983e3700STom Rini } 86983e3700STom Rini 87983e3700STom Rini /* 88983e3700STom Rini * This function is derived from PowerPC code (read timebase as long long). 89983e3700STom Rini * On ARM it just returns the timer value. 90983e3700STom Rini */ get_ticks(void)91983e3700STom Riniunsigned long long get_ticks(void) 92983e3700STom Rini { 93983e3700STom Rini return get_timer(0); 94983e3700STom Rini } 95983e3700STom Rini 96983e3700STom Rini /* 97983e3700STom Rini * This function is derived from PowerPC code (timebase clock frequency). 98983e3700STom Rini * On ARM it returns the number of timer ticks per second. 99983e3700STom Rini */ get_tbclk(void)100983e3700STom Riniulong get_tbclk(void) 101983e3700STom Rini { 102983e3700STom Rini return CONFIG_SYS_HZ; 103983e3700STom Rini } 104