88 lines
1.6 KiB
C
88 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
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* (C) Copyright 2012 Renesas Solutions Corp.
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*/
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#include <common.h>
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#include <div64.h>
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#include <init.h>
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#include <time.h>
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#include <asm/io.h>
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#include <asm/arch-armv7/globaltimer.h>
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#include <asm/arch/rmobile.h>
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#include <linux/delay.h>
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static struct globaltimer *global_timer = \
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(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;
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#define CLK2MHZ(clk) (clk / 1000 / 1000)
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static u64 get_cpu_global_timer(void)
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{
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u32 low, high;
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u64 timer;
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u32 old = readl(&global_timer->cnt_h);
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while (1) {
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low = readl(&global_timer->cnt_l);
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high = readl(&global_timer->cnt_h);
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if (old == high)
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break;
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else
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old = high;
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}
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timer = high;
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return (u64)((timer << 32) | low);
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}
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static u64 get_time_us(void)
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{
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u64 timer = get_cpu_global_timer();
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timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1));
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do_div(timer, CLK2MHZ(CONFIG_SYS_CPU_CLK));
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return timer;
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}
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static ulong get_time_ms(void)
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{
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u64 us = get_time_us();
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do_div(us, 1000);
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return us;
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}
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int timer_init(void)
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{
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writel(0x01, &global_timer->ctl);
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return 0;
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}
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void __udelay(unsigned long usec)
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{
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u64 start, current;
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u64 wait;
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start = get_cpu_global_timer();
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wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2);
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do {
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current = get_cpu_global_timer();
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} while ((current - start) < wait);
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}
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ulong get_timer(ulong base)
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{
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return get_time_ms() - base;
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}
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unsigned long long get_ticks(void)
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{
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return get_cpu_global_timer();
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}
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ulong get_tbclk(void)
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{
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return (ulong)(CONFIG_SYS_CPU_CLK >> 2);
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}
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