mirror of
https://github.com/AsahiLinux/u-boot
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142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
/*
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* (C) Copyright 2007-2008
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* Stelian Pop <stelian.pop@leadtechdesign.com>
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* Lead Tech Design <www.leadtechdesign.com>
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*
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* (C) Copyright 2010
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* Matthias Weisser, Graf-Syteco <weisserm@arcor.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 <div64.h>
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/hardware.h>
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#define TIMER_LOAD_VAL 0xffffffff
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#define TIMER_FREQ (CONFIG_MB86R0x_IOCLK / 256)
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static unsigned long long timestamp;
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static ulong lastdec;
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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);
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return tick;
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}
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static inline unsigned long long usec_to_tick(unsigned long long usec)
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{
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usec *= TIMER_FREQ;
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do_div(usec, 1000000);
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return usec;
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}
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/* nothing really to do with interrupts, just starts up a counter. */
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int timer_init(void)
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{
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struct mb86r0x_timer * timer = (struct mb86r0x_timer *)
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MB86R0x_TIMER_BASE;
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ulong ctrl = readl(&timer->control);
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writel(TIMER_LOAD_VAL, &timer->load);
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ctrl |= MB86R0x_TIMER_ENABLE | MB86R0x_TIMER_PRS_8S |
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MB86R0x_TIMER_SIZE_32;
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writel(ctrl, &timer->control);
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reset_timer_masked();
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return 0;
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}
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/*
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* timer without interrupts
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*/
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unsigned long long get_ticks(void)
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{
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struct mb86r0x_timer * timer = (struct mb86r0x_timer *)
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MB86R0x_TIMER_BASE;
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ulong now = readl(&timer->value);
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if (now <= lastdec) {
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/* normal mode (non roll) */
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/* move stamp forward with absolut diff ticks */
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timestamp += lastdec - now;
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} else {
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/* we have rollover of incrementer */
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timestamp += lastdec + TIMER_LOAD_VAL - now;
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}
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lastdec = now;
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return timestamp;
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}
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void reset_timer_masked(void)
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{
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struct mb86r0x_timer * timer = (struct mb86r0x_timer *)
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MB86R0x_TIMER_BASE;
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/* capture current value time */
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lastdec = readl(&timer->value);
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timestamp = 0; /* start "advancing" time stamp from 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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void __udelay(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 = usec_to_tick(usec);
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tmp = get_ticks(); /* get current timestamp */
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while ((get_ticks() - tmp) < tmo) /* loop till event */
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/*NOP*/;
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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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/*
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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;
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return tbclk;
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}
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