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

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.9 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#ifdef CONFIG_USE_IRQ
36#include <asm/proc-armv/ptrace.h>
37
38/*
39 * When interrupts are enabled, use timer 2 for time/delay generation...
40 */
41
42#define FREQ            66666666
43#define CLOCK_TICK_RATE (((FREQ / CFG_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CFG_HZ)
44#define LATCH           ((CLOCK_TICK_RATE + CFG_HZ/2) / CFG_HZ) /* For divider */
45
46struct _irq_handler {
47        void                *m_data;
48        void (*m_func)( void *data);
49};
50
51static struct _irq_handler IRQ_HANDLER[N_IRQS];
52
53static volatile ulong timestamp;
54
55static void default_isr(void *data)
56{
57        printf("default_isr():  called for IRQ %d, Interrupt Status=%x PR=%x\n",
58               (int)data, *IXP425_ICIP, *IXP425_ICIH);
59}
60
61static int next_irq(void)
62{
63        return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1);
64}
65
66static void timer_isr(void *data)
67{
68        unsigned int *pTime = (unsigned int *)data;
69
70        (*pTime)++;
71
72        /*
73         * Reset IRQ source
74         */
75        *IXP425_OSST = IXP425_OSST_TIMER_2_PEND;
76}
77
78ulong get_timer (ulong base)
79{
80        return timestamp - base;
81}
82
83void reset_timer (void)
84{
85        timestamp = 0;
86}
87
88#endif /* #ifdef CONFIG_USE_IRQ */
89
90#ifdef CONFIG_USE_IRQ
91void do_irq (struct pt_regs *pt_regs)
92{
93        int irq = next_irq();
94
95        IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
96}
97#endif
98
99int interrupt_init (void)
100{
101#ifdef CONFIG_USE_IRQ
102        int i;
103
104        /* install default interrupt handlers */
105        for (i = 0; i < N_IRQS; i++) {
106                IRQ_HANDLER[i].m_data = (void *)i;
107                IRQ_HANDLER[i].m_func = default_isr;
108        }
109
110        /* install interrupt handler for timer */
111        IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_data = (void *)&timestamp;
112        IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_func = timer_isr;
113
114        /* setup the Timer counter value */
115        *IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE;
116
117        /* configure interrupts for IRQ mode */
118        *IXP425_ICLR = 0x00000000;
119
120        /* enable timer irq */
121        *IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ);
122#endif
123
124        return (0);
125}
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