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Graeme Russabf0cd32009-02-24 21:13:40 +11001/*
2 * (C) Copyright 2009
3 * Graeme Russ, graeme.russ@gmail.com
4 *
5 * (C) Copyright 2007
6 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
7 *
8 * (C) Copyright 2006
9 * Detlev Zundel, DENX Software Engineering, dzu@denx.de
10 *
11 * (C) Copyright -2003
12 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
13 *
14 * (C) Copyright 2002
15 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
16 *
17 * (C) Copyright 2001
18 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
19 *
20 * See file CREDITS for list of people who contributed to this
21 * project.
22 *
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public License as
25 * published by the Free Software Foundation; either version 2 of
26 * the License, or (at your option) any later version.
27 *
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
31 * GNU General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public License
34 * along with this program; if not, write to the Free Software
35 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
36 * MA 02111-1307 USA
37 */
38
39/*
40 * This file contains the high-level API for the interrupt sub-system
41 * of the i386 port of U-Boot. Most of the functionality has been
42 * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
43 * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
44 * credited for the corresponding work on those ports. The original
45 * interrupt handling routines for the i386 port were written by
46 * Daniel Engström
47 */
48
49#include <common.h>
50#include <asm/interrupt.h>
51
52struct irq_action {
53 interrupt_handler_t *handler;
54 void *arg;
55 unsigned int count;
56};
57
58static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
59static int spurious_irq_cnt = 0;
60static int spurious_irq = 0;
61
62void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
63{
64 int status;
65
66 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
67 printf("irq_install_handler: bad irq number %d\n", irq);
68 return;
69 }
70
71 if (irq_handlers[irq].handler != NULL)
72 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
Graeme Russe17ee152009-02-24 21:14:56 +110073 (ulong) handler + gd->reloc_off,
Graeme Russabf0cd32009-02-24 21:13:40 +110074 (ulong) irq_handlers[irq].handler);
75
76 status = disable_interrupts ();
77
Graeme Russe17ee152009-02-24 21:14:56 +110078 irq_handlers[irq].handler = handler + gd->reloc_off;
Graeme Russabf0cd32009-02-24 21:13:40 +110079 irq_handlers[irq].arg = arg;
80 irq_handlers[irq].count = 0;
81
82 unmask_irq(irq);
83
84 if (status)
85 enable_interrupts();
86
87 return;
88}
89
90void irq_free_handler(int irq)
91{
92 int status;
93
94 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
95 printf("irq_free_handler: bad irq number %d\n", irq);
96 return;
97 }
98
99 status = disable_interrupts ();
100
101 mask_irq(irq);
102
103 irq_handlers[irq].handler = NULL;
104 irq_handlers[irq].arg = NULL;
105
106 if (status)
107 enable_interrupts();
108
109 return;
110}
111
112__isr__ do_irq(int irq)
113{
114 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
115 printf("do_irq: bad irq number %d\n", irq);
116 return;
117 }
118
119 if (irq_handlers[irq].handler) {
120 mask_irq(irq);
121
122 irq_handlers[irq].handler(irq_handlers[irq].arg);
123 irq_handlers[irq].count++;
124
125 unmask_irq(irq);
126 specific_eoi(irq);
127
128 } else {
129 if ((irq & 7) != 7) {
130 spurious_irq_cnt++;
131 spurious_irq = irq;
132 }
133 }
134}
135
136#if defined(CONFIG_CMD_IRQ)
137int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
138{
139 int irq;
140
141 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
142 spurious_irq_cnt, spurious_irq);
143
144 printf ("Interrupt-Information:\n");
145 printf ("Nr Routine Arg Count\n");
146
147 for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
148 if (irq_handlers[irq].handler != NULL) {
149 printf ("%02d %08lx %08lx %d\n",
150 irq,
151 (ulong)irq_handlers[irq].handler,
152 (ulong)irq_handlers[irq].arg,
153 irq_handlers[irq].count);
154 }
155 }
156
157 return 0;
158}
159#endif