mirror of
https://github.com/linux-sunxi/u-boot-sunxi.git
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118 lines
2.4 KiB
C
118 lines
2.4 KiB
C
/*
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* Copyright 2010-2011 Calxeda, Inc.
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*
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* Based on arm926ejs/mx27/timer.c
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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 <div64.h>
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#include <linux/types.h> /* for size_t */
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#include <linux/stddef.h> /* for NULL */
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#include <asm/io.h>
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#include <asm/arch-armv7/systimer.h>
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#undef SYSTIMER_BASE
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#define SYSTIMER_BASE 0xFFF34000 /* Timer 0 and 1 base */
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#define SYSTIMER_RATE (150000000 / 256)
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static ulong timestamp;
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static ulong lastinc;
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static struct systimer *systimer_base = (struct systimer *)SYSTIMER_BASE;
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/*
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* Start the timer
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*/
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int timer_init(void)
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{
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/*
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* Setup timer0
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*/
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writel(0, &systimer_base->timer0control);
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writel(SYSTIMER_RELOAD, &systimer_base->timer0load);
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writel(SYSTIMER_RELOAD, &systimer_base->timer0value);
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writel(SYSTIMER_EN | SYSTIMER_32BIT | SYSTIMER_PRESC_256,
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&systimer_base->timer0control);
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return 0;
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}
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#define TICK_PER_TIME ((SYSTIMER_RATE + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ)
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#define NS_PER_TICK (1000000000 / SYSTIMER_RATE)
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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do_div(tick, TICK_PER_TIME);
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return tick;
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}
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static inline unsigned long long time_to_tick(unsigned long long time)
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{
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return time * TICK_PER_TIME;
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}
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static inline unsigned long long us_to_tick(unsigned long long us)
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{
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unsigned long long tick = us * 1000;
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tick += NS_PER_TICK - 1;
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do_div(tick, NS_PER_TICK);
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return tick;
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}
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unsigned long long get_ticks(void)
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{
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ulong now = ~readl(&systimer_base->timer0value);
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if (now >= lastinc) /* normal mode (non roll) */
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/* move stamp forward with absolut diff ticks */
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timestamp += (now - lastinc);
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else /* we have rollover of incrementer */
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timestamp += (0xFFFFFFFF - lastinc) + now;
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lastinc = now;
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return timestamp;
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}
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/*
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* Delay x useconds AND preserve advance timstamp value
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* assumes timer is ticking at 1 msec
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*/
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void __udelay(ulong usec)
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{
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unsigned long long tmp;
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ulong tmo;
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tmo = us_to_tick(usec);
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tmp = get_ticks() + tmo; /* get current timestamp */
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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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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void reset_timer_masked(void)
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{
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lastinc = ~readl(&systimer_base->timer0value);
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timestamp = 0;
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}
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void reset_timer(void)
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{
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reset_timer_masked();
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}
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ulong get_timer_masked(void)
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{
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return tick_to_time(get_ticks());
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}
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ulong get_tbclk(void)
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{
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return SYSTIMER_RATE;
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}
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