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wdenk2d5b5612003-10-14 19:43:55 +00001/*
Wolfgang Denkba94a1b2006-05-30 15:56:48 +02002 * (C) Copyright 2006
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
4 *
wdenk2d5b5612003-10-14 19:43:55 +00005 * (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
wdenk2d5b5612003-10-14 19:43:55 +000035#ifdef CONFIG_USE_IRQ
Andreas Engel6d0943a2008-01-14 09:06:52 +000036#include <asm/proc-armv/ptrace.h>
37
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020038/*
39 * When interrupts are enabled, use timer 2 for time/delay generation...
40 */
wdenk2d5b5612003-10-14 19:43:55 +000041
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020042#define FREQ 66666666
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020043#define CLOCK_TICK_RATE (((FREQ / CONFIG_SYS_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CONFIG_SYS_HZ)
44#define LATCH ((CLOCK_TICK_RATE + CONFIG_SYS_HZ/2) / CONFIG_SYS_HZ) /* For divider */
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020045
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
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020055static 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
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020088#endif /* #ifdef CONFIG_USE_IRQ */
wdenk2d5b5612003-10-14 19:43:55 +000089
Andreas Engel6d0943a2008-01-14 09:06:52 +000090#ifdef CONFIG_USE_IRQ
wdenk2d5b5612003-10-14 19:43:55 +000091void do_irq (struct pt_regs *pt_regs)
92{
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020093 int irq = next_irq();
94
95 IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
wdenk2d5b5612003-10-14 19:43:55 +000096}
Andreas Engel6d0943a2008-01-14 09:06:52 +000097#endif
wdenk2d5b5612003-10-14 19:43:55 +000098
wdenk2d5b5612003-10-14 19:43:55 +000099int interrupt_init (void)
100{
Wolfgang Denkba94a1b2006-05-30 15:56:48 +0200101#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
wdenk2d5b5612003-10-14 19:43:55 +0000124 return (0);
125}