mirror of
https://github.com/AsahiLinux/u-boot
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129 lines
2.7 KiB
C
129 lines
2.7 KiB
C
/*
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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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <asm/arch/pxa-regs.h>
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#include <asm/io.h>
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#include <common.h>
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#include <div64.h>
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#ifdef CONFIG_USE_IRQ
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#error: interrupts not implemented yet
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#endif
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#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
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#define TIMER_FREQ_HZ 3250000
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#elif defined(CONFIG_PXA250)
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#define TIMER_FREQ_HZ 3686400
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#else
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#error "Timer frequency unknown - please config PXA CPU type"
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#endif
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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, TIMER_FREQ_HZ);
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return tick;
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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 * TIMER_FREQ_HZ + 999999;
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do_div(us, 1000000);
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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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reset_timer();
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return 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 (ulong base)
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{
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return get_timer_masked () - base;
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}
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void set_timer (ulong t)
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{
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/* nop */
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}
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void __udelay (unsigned long usec)
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{
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udelay_masked (usec);
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}
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void reset_timer_masked (void)
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{
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writel(0, OSCR);
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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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void udelay_masked (unsigned long 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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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return readl(OSCR);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk (void)
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{
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ulong tbclk;
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tbclk = TIMER_FREQ_HZ;
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return tbclk;
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}
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