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[people/ms/u-boot.git] / arch / powerpc / cpu / 74xx_7xx / interrupts.c
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1/*
2 * (C) Copyright 2001
3 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * interrupts.c - just enough support for the decrementer/timer
26 */
27
28#include <common.h>
29#include <mpc8xx.h>
30#include <mpc8xx_irq.h>
31#include <asm/processor.h>
32#include <commproc.h>
33#include <command.h>
34
a8c7c708 35int interrupt_init_cpu (unsigned *decrementer_count)
ec0852cf 36{
c7de829c 37#if defined(DEBUG) && !defined(CONFIG_AMIGAONEG3SE)
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38 printf("interrupt_init: GT main cause reg: %08x:%08x\n",
39 GTREGREAD(LOW_INTERRUPT_CAUSE_REGISTER),
40 GTREGREAD(HIGH_INTERRUPT_CAUSE_REGISTER));
41 printf("interrupt_init: ethernet cause regs: %08x %08x %08x\n",
42 GTREGREAD(ETHERNET0_INTERRUPT_CAUSE_REGISTER),
43 GTREGREAD(ETHERNET1_INTERRUPT_CAUSE_REGISTER),
44 GTREGREAD(ETHERNET2_INTERRUPT_CAUSE_REGISTER));
45 printf("interrupt_init: ethernet mask regs: %08x %08x %08x\n",
46 GTREGREAD(ETHERNET0_INTERRUPT_MASK_REGISTER),
47 GTREGREAD(ETHERNET1_INTERRUPT_MASK_REGISTER),
48 GTREGREAD(ETHERNET2_INTERRUPT_MASK_REGISTER));
49 puts("interrupt_init: setting decrementer_count\n");
50#endif
6d0f6bcf 51 *decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
ec0852cf 52
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53 return (0);
54}
55
56/****************************************************************************/
57
58/*
59 * Handle external interrupts
60 */
61void
62external_interrupt(struct pt_regs *regs)
63{
64 puts("external_interrupt (oops!)\n");
65}
66
67volatile ulong timestamp = 0;
68
69/*
70 * timer_interrupt - gets called when the decrementer overflows,
71 * with interrupts disabled.
72 * Trivial implementation - no need to be really accurate.
73 */
74void
a8c7c708 75timer_interrupt_cpu (struct pt_regs *regs)
ec0852cf 76{
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77 /* nothing to do here */
78 return;
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79}
80
81/****************************************************************************/
82
83/*
84 * Install and free a interrupt handler.
85 */
86
87void
88irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
89{
90
91}
92
93void
94irq_free_handler(int vec)
95{
96
97}
98
99/****************************************************************************/
100
101void
102do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
103{
104 puts("IRQ related functions are unimplemented currently.\n");
105}