102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
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* (C) Copyright 2010
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* Michael Schwingen, michael@schwingen.org
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*
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* (C) Copyright 2006
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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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/arch/ixp425.h>
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#include <asm/io.h>
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#include <div64.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* The IXP42x time-stamp timer runs at 2*OSC_IN (66.666MHz when using a
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* 33.333MHz crystal).
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*/
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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tick *= CONFIG_SYS_HZ;
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do_div(tick, CONFIG_IXP425_TIMER_CLK);
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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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time *= CONFIG_IXP425_TIMER_CLK;
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do_div(time, CONFIG_SYS_HZ);
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return 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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us = us * CONFIG_IXP425_TIMER_CLK + 999999;
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do_div(us, 1000000);
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return us;
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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(IXP425_OSTS_B);
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if (readl(IXP425_OSST) & IXP425_OSST_TIMER_TS_PEND) {
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/* rollover of timestamp timer register */
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gd->arch.timestamp += (0xFFFFFFFF - gd->arch.lastinc) + now + 1;
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writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
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} else {
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/* move stamp forward with absolut diff ticks */
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gd->arch.timestamp += (now - gd->arch.lastinc);
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}
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gd->arch.lastinc = now;
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return gd->arch.timestamp;
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}
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void reset_timer_masked(void)
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{
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/* capture current timestamp counter */
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gd->arch.lastinc = readl(IXP425_OSTS_B);
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/* start "advancing" time stamp from 0 */
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gd->arch.timestamp = 0;
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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_timer(ulong base)
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{
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return get_timer_masked() - base;
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}
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/* delay x useconds AND preserve advance timestamp value */
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void __udelay(unsigned long usec)
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{
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unsigned long long tmp;
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tmp = get_ticks() + us_to_tick(usec);
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while (get_ticks() < tmp)
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;
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}
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int timer_init(void)
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{
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writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
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return 0;
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}
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