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 "opt_platform.h"
40#include "opt_hwpmc_hooks.h"
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: stable/11/sys/arm/arm/intr.c 331722 2018-03-29 02:50:57Z eadler $");
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/syslog.h>
48#include <sys/kernel.h>
49#include <sys/malloc.h>
50#include <sys/proc.h>
51#include <sys/bus.h>
52#include <sys/interrupt.h>
53#include <sys/conf.h>
54#include <sys/pmc.h>
55#include <sys/pmckern.h>
56#include <sys/vmmeter.h>
57
58#include <machine/atomic.h>
59#include <machine/bus.h>
60#include <machine/intr.h>
61#include <machine/cpu.h>
62
63#ifdef FDT
64#include <dev/fdt/fdt_common.h>
65#include <machine/fdt.h>
66#endif
67
68#define	INTRNAME_LEN	(MAXCOMLEN + 1)
69
70typedef void (*mask_fn)(void *);
71
72static struct intr_event *intr_events[NIRQ];
73
74void	intr_irq_handler(struct trapframe *);
75
76void (*arm_post_filter)(void *) = NULL;
77int (*arm_config_irq)(int irq, enum intr_trigger trig,
78    enum intr_polarity pol) = NULL;
79
80/* Data for statistics reporting. */
81u_long intrcnt[NIRQ];
82char intrnames[(NIRQ * INTRNAME_LEN) + 1];
83size_t sintrcnt = sizeof(intrcnt);
84size_t sintrnames = sizeof(intrnames);
85
86/*
87 * Pre-format intrnames into an array of fixed-size strings containing spaces.
88 * This allows us to avoid the need for an intermediate table of indices into
89 * the names and counts arrays, while still meeting the requirements and
90 * assumptions of vmstat(8) and the kdb "show intrcnt" command, the two
91 * consumers of this data.
92 */
93static void
94intr_init(void *unused)
95{
96	int i;
97
98	for (i = 0; i < NIRQ; ++i) {
99		snprintf(&intrnames[i * INTRNAME_LEN], INTRNAME_LEN, "%-*s",
100		    INTRNAME_LEN - 1, "");
101	}
102}
103
104SYSINIT(intr_init, SI_SUB_INTR, SI_ORDER_FIRST, intr_init, NULL);
105
106#ifdef FDT
107int
108intr_fdt_map_irq(phandle_t iparent, pcell_t *intr, int icells)
109{
110	fdt_pic_decode_t intr_decode;
111	phandle_t intr_parent;
112	int i, rv, interrupt, trig, pol;
113
114	intr_parent = OF_node_from_xref(iparent);
115	for (i = 0; i < icells; i++)
116		intr[i] = cpu_to_fdt32(intr[i]);
117
118	for (i = 0; fdt_pic_table[i] != NULL; i++) {
119		intr_decode = fdt_pic_table[i];
120		rv = intr_decode(intr_parent, intr, &interrupt, &trig, &pol);
121
122		if (rv == 0) {
123			/* This was recognized as our PIC and decoded. */
124			interrupt = FDT_MAP_IRQ(intr_parent, interrupt);
125			return (interrupt);
126		}
127	}
128
129	/* Not in table, so guess */
130	interrupt = FDT_MAP_IRQ(intr_parent, fdt32_to_cpu(intr[0]));
131
132	return (interrupt);
133}
134#endif
135
136void
137arm_setup_irqhandler(const char *name, driver_filter_t *filt,
138    void (*hand)(void*), void *arg, int irq, int flags, void **cookiep)
139{
140	struct intr_event *event;
141	int error;
142
143	if (irq < 0 || irq >= NIRQ)
144		return;
145	event = intr_events[irq];
146	if (event == NULL) {
147		error = intr_event_create(&event, (void *)irq, 0, irq,
148		    (mask_fn)arm_mask_irq, (mask_fn)arm_unmask_irq,
149		    arm_post_filter, NULL, "intr%d:", irq);
150		if (error)
151			return;
152		intr_events[irq] = event;
153		snprintf(&intrnames[irq * INTRNAME_LEN], INTRNAME_LEN,
154		    "irq%d: %-*s", irq, INTRNAME_LEN - 1, name);
155	}
156	intr_event_add_handler(event, name, filt, hand, arg,
157	    intr_priority(flags), flags, cookiep);
158}
159
160int
161arm_remove_irqhandler(int irq, void *cookie)
162{
163	struct intr_event *event;
164	int error;
165
166	event = intr_events[irq];
167	arm_mask_irq(irq);
168
169	error = intr_event_remove_handler(cookie);
170
171	if (!TAILQ_EMPTY(&event->ie_handlers))
172		arm_unmask_irq(irq);
173	return (error);
174}
175
176void dosoftints(void);
177void
178dosoftints(void)
179{
180}
181
182void
183intr_irq_handler(struct trapframe *frame)
184{
185	struct intr_event *event;
186	int i;
187
188	PCPU_INC(cnt.v_intr);
189	i = -1;
190	while ((i = arm_get_next_irq(i)) != -1) {
191		intrcnt[i]++;
192		event = intr_events[i];
193		if (intr_event_handle(event, frame) != 0) {
194			/* XXX: Log stray IRQs */
195			arm_mask_irq(i);
196		}
197	}
198#ifdef HWPMC_HOOKS
199	if (pmc_hook && (PCPU_GET(curthread)->td_pflags & TDP_CALLCHAIN))
200		pmc_hook(PCPU_GET(curthread), PMC_FN_USER_CALLCHAIN, frame);
201#endif
202}
203