mirror of
https://github.com/AsahiLinux/u-boot
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98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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* (C) Copyright 2007
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* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
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*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.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 <common.h>
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#include <asm/processor.h>
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#define TMU_MAX_COUNTER (~0UL)
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static void tmu_timer_start (unsigned int timer)
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{
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if (timer > 2)
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return;
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*((volatile unsigned char *) TSTR) |= (1 << timer);
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}
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static void tmu_timer_stop (unsigned int timer)
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{
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u8 val = *((volatile u8 *)TSTR);
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if (timer > 2)
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return;
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*((volatile unsigned char *)TSTR) = val &~(1 << timer);
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}
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int timer_init (void)
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{
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/* Divide clock by 4 */
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*(volatile u16 *)TCR0 = 0;
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tmu_timer_stop(0);
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tmu_timer_start(0);
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return 0;
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}
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/*
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In theory we should return a true 64bit value (ie something that doesn't
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overflow). However, we don't. Therefore if TMU runs at fastest rate of
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6.75 MHz this value will wrap after u-boot has been running for approx
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10 minutes.
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*/
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unsigned long long get_ticks (void)
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{
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return (0 - *((volatile u32 *) TCNT0));
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}
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unsigned long get_timer (unsigned long base)
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{
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return ((0 - *((volatile u32 *) TCNT0)) - base);
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}
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void set_timer (unsigned long t)
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{
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*((volatile unsigned int *) TCNT0) = (0 - t);
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}
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void reset_timer (void)
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{
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tmu_timer_stop(0);
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set_timer (0);
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tmu_timer_start(0);
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}
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void udelay (unsigned long usec)
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{
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unsigned int start = get_timer (0);
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unsigned int end = start + (usec * ((CONFIG_SYS_HZ + 500000) / 1000000));
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while (get_timer (0) < end)
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continue;
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}
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unsigned long get_tbclk (void)
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{
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return CONFIG_SYS_HZ;
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}
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