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https://github.com/AsahiLinux/u-boot
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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
/*
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* Copyright (C) 2012 Altera Corporation <www.altera.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/timer.h>
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DECLARE_GLOBAL_DATA_PTR;
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static const struct socfpga_timer *timer_base = (void *)CONFIG_SYS_TIMERBASE;
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/*
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* Timer initialization
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*/
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int timer_init(void)
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{
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writel(TIMER_LOAD_VAL, &timer_base->load_val);
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writel(TIMER_LOAD_VAL, &timer_base->curr_val);
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writel(readl(&timer_base->ctrl) | 0x3, &timer_base->ctrl);
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return 0;
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}
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static u32 read_timer(void)
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{
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return readl(&timer_base->curr_val);
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}
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/*
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* Delay x useconds
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*/
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void __udelay(unsigned long usec)
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{
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unsigned long now, last;
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/*
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* get the tmo value based on timer clock speed
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* tmo = delay required / period of timer clock
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*/
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long tmo = usec * CONFIG_TIMER_CLOCK_KHZ / 1000;
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last = read_timer();
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while (tmo > 0) {
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now = read_timer();
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if (last >= now)
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/* normal mode (non roll) */
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tmo -= last - now;
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else
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/* we have overflow of the count down timer */
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tmo -= TIMER_LOAD_VAL - last + now;
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last = now;
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}
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}
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/*
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* Get the timer value
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*/
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ulong get_timer(ulong base)
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{
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return get_timer_masked() - base;
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}
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/*
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* Timer : get the time difference
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* Unit of tick is based on the CONFIG_SYS_HZ
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*/
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ulong get_timer_masked(void)
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{
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/* current tick value */
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ulong now = read_timer() / (CONFIG_TIMER_CLOCK_KHZ/CONFIG_SYS_HZ);
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if (gd->arch.lastinc >= now) {
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/* normal mode (non roll) */
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/* move stamp forward with absolute diff ticks */
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gd->arch.tbl += gd->arch.lastinc - now;
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} else {
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/* we have overflow of the count down timer */
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gd->arch.tbl += TIMER_LOAD_VAL - gd->arch.lastinc + now;
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}
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gd->arch.lastinc = now;
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return gd->arch.tbl;
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}
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/*
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* Reset the timer
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*/
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void reset_timer(void)
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{
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/* capture current decrementer value time */
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gd->arch.lastinc = read_timer() /
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(CONFIG_TIMER_CLOCK_KHZ / CONFIG_SYS_HZ);
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/* start "advancing" time stamp from 0 */
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gd->arch.tbl = 0;
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}
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