source: SVN/rincon/u-boot/cpu/ixp/timer.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 2 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.2 KB
Line 
1/*
2 * (C) Copyright 2006
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
4 *
5 * (C) Copyright 2002
6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Marius Groeger <mgroeger@sysgo.de>
8 *
9 * (C) Copyright 2002
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Alex Zuepke <azu@sysgo.de>
12 *
13 * See file CREDITS for list of people who contributed to this
14 * project.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 */
31
32#include <common.h>
33#include <asm/arch/ixp425.h>
34
35#ifndef CONFIG_USE_IRQ
36ulong get_timer (ulong base)
37{
38       return get_timer_masked () - base;
39}
40
41void ixp425_udelay(unsigned long usec)
42{
43        /*
44         * This function has a max usec, but since it is called from udelay
45         * we should not have to worry... be happy
46         */
47        unsigned long usecs = CFG_HZ/1000000L & ~IXP425_OST_RELOAD_MASK;
48
49        *IXP425_OSST = IXP425_OSST_TIMER_1_PEND;
50        usecs |= IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE;
51        *IXP425_OSRT1 = usecs;
52        while (!(*IXP425_OSST & IXP425_OSST_TIMER_1_PEND));
53}
54
55void udelay (unsigned long usec)
56{
57        while (usec--) ixp425_udelay(1);
58}
59
60static ulong reload_constant = 0xfffffff0;
61
62void reset_timer_masked (void)
63{
64        ulong reload = reload_constant | IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE;
65
66        *IXP425_OSST = IXP425_OSST_TIMER_1_PEND;
67        *IXP425_OSRT1 = reload;
68}
69
70ulong get_timer_masked (void)
71{
72        /*
73         * Note that it is possible for this to wrap!
74         * In this case we return max.
75         */
76        ulong current = *IXP425_OST1;
77        if (*IXP425_OSST & IXP425_OSST_TIMER_1_PEND)
78        {
79                return reload_constant;
80        }
81        return (reload_constant - current);
82}
83#endif /* #ifndef CONFIG_USE_IRQ */
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