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17659d7de9
In some circumstances, reset_timer_masked() was called be timer_init() in order to perform architecture specific timer initialisation. In such cases, the required code in reset_timer_masked() has been moved into timer_init()
119 lines
2.3 KiB
C
119 lines
2.3 KiB
C
/*
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* (C) Copyright 2004
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* DAVE Srl
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* http://www.dave-tech.it
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* http://www.wawnet.biz
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* mailto:info@wawnet.biz
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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/hardware.h>
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/* we always count down the max. */
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#define TIMER_LOAD_VAL 0xffff
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/* macro to read the 16 bit timer */
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#define READ_TIMER (TCNTO1 & 0xffff)
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#ifdef CONFIG_USE_IRQ
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#error CONFIG_USE_IRQ NOT supported
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#endif
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static ulong timestamp;
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static ulong lastdec;
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int timer_init (void)
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{
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TCFG0 = 0x000000E9;
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TCFG1 = 0x00000004;
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TCON = 0x00000900;
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TCNTB1 = TIMER_LOAD_VAL;
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TCMPB1 = 0;
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TCON = 0x00000B00;
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TCON = 0x00000900;
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lastdec = TCNTB1 = TIMER_LOAD_VAL;
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timestamp = 0;
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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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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 __udelay (unsigned long usec)
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{
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ulong tmo;
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tmo = usec / 1000;
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tmo *= CONFIG_SYS_HZ;
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tmo /= 8;
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tmo += get_timer (0);
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while (get_timer_masked () < tmo)
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/*NOP*/;
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}
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ulong get_timer_masked (void)
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{
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ulong now = READ_TIMER;
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if (lastdec >= now) {
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/* normal mode */
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timestamp += lastdec - now;
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} else {
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/* we have an overflow ... */
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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 udelay_masked (unsigned long usec)
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{
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ulong tmo;
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ulong endtime;
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signed long diff;
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if (usec >= 1000) {
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tmo = usec / 1000;
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tmo *= CONFIG_SYS_HZ;
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tmo /= 8;
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} else {
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tmo = usec * CONFIG_SYS_HZ;
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tmo /= (1000*8);
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}
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endtime = get_timer(0) + tmo;
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do {
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ulong now = get_timer_masked ();
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diff = endtime - now;
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} while (diff >= 0);
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}
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