intr.c revision 245637 
1/*	$NetBSD: intr.c,v 1.12 2003/07/15 00:24:41 lukem Exp $	*/
2
3/*-
4 * Copyright (c) 2004 Olivier Houchard.
5 * Copyright (c) 1994-1998 Mark Brinicombe.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by Mark Brinicombe
19 *	for the NetBSD Project.
20 * 4. The name of the company nor the name of the author may be used to
21 *    endorse or promote products derived from this software without specific
22 *    prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
28 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * Soft interrupt and other generic interrupt functions.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/arm/arm/intr.c 245637 2013-01-19 00:50:12Z ian $");
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/syslog.h>
44#include <sys/malloc.h>
45#include <sys/proc.h>
46#include <sys/bus.h>
47#include <sys/interrupt.h>
48#include <sys/conf.h>
49#include <machine/atomic.h>
50#include <machine/intr.h>
51#include <machine/cpu.h>
52
53#define	INTRNAME_LEN	(MAXCOMLEN + 1)
54
55typedef void (*mask_fn)(void *);
56
57static struct intr_event *intr_events[NIRQ];
58
59void	arm_handler_execute(struct trapframe *, int);
60
61void (*arm_post_filter)(void *) = NULL;
62
63/*
64 * Pre-format intrnames into an array of fixed-size strings containing spaces.
65 * This allows us to avoid the need for an intermediate table of indices into
66 * the names and counts arrays, while still meeting the requirements and
67 * assumptions of vmstat(8) and the kdb "show intrcnt" command, the two
68 * consumers of this data.
69 */
70void
71arm_intrnames_init()
72{
73	int i;
74
75	memset(intrnames, ' ', NIRQ * INTRNAME_LEN);
76	for (i = 0; i < NIRQ; ++i)
77		intrnames[i * INTRNAME_LEN - 1] = 0;
78}
79
80void
81arm_setup_irqhandler(const char *name, driver_filter_t *filt,
82    void (*hand)(void*), void *arg, int irq, int flags, void **cookiep)
83{
84	struct intr_event *event;
85	int error;
86	char namebuf[INTRNAME_LEN];
87
88	if (irq < 0 || irq >= NIRQ)
89		return;
90	event = intr_events[irq];
91	if (event == NULL) {
92		error = intr_event_create(&event, (void *)irq, 0, irq,
93		    (mask_fn)arm_mask_irq, (mask_fn)arm_unmask_irq,
94		    arm_post_filter, NULL, "intr%d:", irq);
95		if (error)
96			return;
97		intr_events[irq] = event;
98		snprintf(namebuf, sizeof(namebuf), "irq%d: %s", irq, name);
99		sprintf(intrnames + INTRNAME_LEN * irq, "%-*s",
100		    INTRNAME_LEN - 1, namebuf);
101	}
102	intr_event_add_handler(event, name, filt, hand, arg,
103	    intr_priority(flags), flags, cookiep);
104}
105
106int
107arm_remove_irqhandler(int irq, void *cookie)
108{
109	struct intr_event *event;
110	int error;
111
112	event = intr_events[irq];
113	arm_mask_irq(irq);
114
115	error = intr_event_remove_handler(cookie);
116
117	if (!TAILQ_EMPTY(&event->ie_handlers))
118		arm_unmask_irq(irq);
119	return (error);
120}
121
122void dosoftints(void);
123void
124dosoftints(void)
125{
126}
127
128void
129arm_handler_execute(struct trapframe *frame, int irqnb)
130{
131	struct intr_event *event;
132	int i;
133
134	PCPU_INC(cnt.v_intr);
135	i = -1;
136	while ((i = arm_get_next_irq(i)) != -1) {
137		intrcnt[i]++;
138		event = intr_events[i];
139		if (intr_event_handle(event, frame) != 0) {
140			/* XXX: Log stray IRQs */
141			arm_mask_irq(i);
142		}
143	}
144}
145