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fix timer routines

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git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1241 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Greg Watson
2003-11-02 17:01:47 +00:00
parent 5bcd408b8e
commit 95e9147817
2 changed files with 69 additions and 16 deletions
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66
src/arch/ppc/lib/timebase.S
View File

@@ -1,12 +1,60 @@
/* Copyright 1999-2000 AG Electronics Ltd. */ /*
/* This code is distributed without warranty under the GPL v2 (see COPYING) */ * (C) Copyright 2000, 2001
* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
* base on code by
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <ppc_asm.tmpl>
.text .text
.globl _timebase /*
_timebase: * unsigned long long _get_ticks(void);
mftbu 3 */
mftb 4 .globl _get_ticks
mftbu 5 _get_ticks:
cmpw 3, 5 1: mftbu r3
bne _timebase mftb r4
mftbu r5
cmpw 0,r3,r5
bne 1b
blr blr
/*
* Delay for a number of ticks
*/
.globl _wait_ticks
_wait_ticks:
mflr r8 /* save link register */
mr r7, r3 /* save tick count */
bl _get_ticks /* Get start time */
/* Calculate end time */
addc r7, r4, r7 /* Compute end time lower */
addze r6, r3 /* and end time upper */
1: bl _get_ticks /* Get current time */
subfc r4, r4, r7 /* Subtract current time from end time */
subfe. r3, r3, r6
bge 1b /* Loop until time expired */
mtlr r8 /* restore link register */
blr

19
src/arch/ppc/lib/timer.c
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@@ -1,30 +1,35 @@
/* Copyright 2000 AG Electronics Ltd. */ /* Copyright 2000 AG Electronics Ltd. */
/* This code is distributed without warranty under the GPL v2 (see COPYING) */ /* This code is distributed without warranty under the GPL v2 (see COPYING) */
#include <timer.h>
#include <ppc.h> #include <ppc.h>
#include <timer.h>
#include <clock.h>
unsigned long get_hz(void) unsigned long get_hz(void)
{ {
return get_clock_speed(); return get_clock_speed();
} }
#if 0
unsigned long ticks_since_boot(void) unsigned long ticks_since_boot(void)
{ {
extern unsigned long _timebase(void); extern unsigned long _get_ticks(void);
return _timebase(); return _get_ticks();
} }
void sleep_ticks(unsigned long ticks) void sleep_ticks(unsigned long ticks)
{ {
unsigned long then = ticks + ticks_since_boot(); unsigned long now = ticks_since_boot();
while(ticks_since_boot() < then) unsigned long then = ticks + now;
; while(now < then)
now = ticks_since_boot();
} }
#endif
void udelay(int usecs) void udelay(int usecs)
{ {
extern void _wait_ticks(unsigned long);
unsigned long ticksperusec = get_hz() / 1000000; unsigned long ticksperusec = get_hz() / 1000000;
sleep_ticks(ticksperusec * usecs); _wait_ticks(ticksperusec * usecs);
} }