source: SVN/rincon/u-boot/cpu/arm920t/ks8695/interrupts.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 3 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.6 KB
Line 
1/*
2 * (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.com>
3 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 */
22
23#include <common.h>
24#include <asm/arch/platform.h>
25
26/*
27 * Handy KS8695 register access functions.
28 */
29#define ks8695_read(a)    *((volatile ulong *) (KS8695_IO_BASE + (a)))
30#define ks8695_write(a,v) *((volatile ulong *) (KS8695_IO_BASE + (a))) = (v)
31
32int timer_inited;
33ulong timer_ticks;
34
35int interrupt_init (void)
36{
37        /* nothing happens here - we don't setup any IRQs */
38        return (0);
39}
40
41/*
42 * Initial timer set constants. Nothing complicated, just set for a 1ms
43 * tick.
44 */
45#define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_1)
46#define TIMER_COUNT     (TIMER_INTERVAL / 2)
47#define TIMER_PULSE     TIMER_COUNT
48
49void reset_timer_masked(void)
50{
51        /* Set the hadware timer for 1ms */
52        ks8695_write(KS8695_TIMER1, TIMER_COUNT);
53        ks8695_write(KS8695_TIMER1_PCOUNT, TIMER_PULSE);
54        ks8695_write(KS8695_TIMER_CTRL, 0x2);
55        timer_ticks = 0;
56        timer_inited++;
57}
58
59void reset_timer(void)
60{
61        reset_timer_masked();
62}
63
64ulong get_timer_masked(void)
65{
66        /* Check for timer wrap */
67        if (ks8695_read(KS8695_INT_STATUS) & KS8695_INTMASK_TIMERINT1) {
68                /* Clear interrupt condition */
69                ks8695_write(KS8695_INT_STATUS, KS8695_INTMASK_TIMERINT1);
70                timer_ticks++;
71        }
72        return timer_ticks;
73}
74
75ulong get_timer(ulong base)
76{
77       return (get_timer_masked() - base);
78}
79
80void set_timer(ulong t)
81{
82        timer_ticks = t;
83}
84
85void udelay(ulong usec)
86{
87        ulong start = get_timer_masked();
88        ulong end;
89
90        if (!timer_inited)
91                reset_timer();
92
93        /* Only 1ms resolution :-( */
94        end = usec / 1000;
95        while (get_timer(start) < end)
96                ;
97}
98
99void reset_cpu (ulong ignored)
100{
101        ulong tc;
102
103        /* Set timer0 to watchdog, and let it timeout */
104        tc = ks8695_read(KS8695_TIMER_CTRL) & 0x2;
105        ks8695_write(KS8695_TIMER_CTRL, tc);
106        ks8695_write(KS8695_TIMER0, ((10 << 8) | 0xff));
107        ks8695_write(KS8695_TIMER_CTRL, (tc | 0x1));
108
109        /* Should only wait here till watchdog resets */
110        for (;;)
111                ;
112}
Note: See TracBrowser for help on using the repository browser.