pl190.c revision 261455 
1/*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@bluezbox.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/sys/arm/arm/pl190.c 261455 2014-02-04 03:36:42Z eadler $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/bus.h>
34#include <sys/kernel.h>
35#include <sys/ktr.h>
36#include <sys/module.h>
37#include <sys/rman.h>
38#include <machine/bus.h>
39#include <machine/intr.h>
40
41#include <dev/fdt/fdt_common.h>
42#include <dev/ofw/openfirm.h>
43#include <dev/ofw/ofw_bus.h>
44#include <dev/ofw/ofw_bus_subr.h>
45
46#ifdef  DEBUG
47#define dprintf(fmt, args...) printf(fmt, ##args)
48#else
49#define dprintf(fmt, args...)
50#endif
51
52#define	VICIRQSTATUS	0x000
53#define	VICFIQSTATUS	0x004
54#define	VICRAWINTR	0x008
55#define	VICINTSELECT	0x00C
56#define	VICINTENABLE	0x010
57#define	VICINTENCLEAR	0x014
58#define	VICSOFTINT	0x018
59#define	VICSOFTINTCLEAR	0x01C
60#define	VICPROTECTION	0x020
61#define	VICPERIPHID	0xFE0
62#define	VICPRIMECELLID	0xFF0
63
64#define	VIC_NIRQS	32
65
66struct pl190_intc_softc {
67	device_t		sc_dev;
68	struct resource *	intc_res;
69};
70
71static struct pl190_intc_softc *pl190_intc_sc = NULL;
72
73#define	intc_vic_read_4(reg)		\
74    bus_read_4(pl190_intc_sc->intc_res, (reg))
75#define	intc_vic_write_4(reg, val)		\
76    bus_write_4(pl190_intc_sc->intc_res, (reg), (val))
77
78static int
79pl190_intc_probe(device_t dev)
80{
81	if (!ofw_bus_is_compatible(dev, "arm,versatile-vic"))
82		return (ENXIO);
83	device_set_desc(dev, "ARM PL190 VIC");
84	return (BUS_PROBE_DEFAULT);
85}
86
87static int
88pl190_intc_attach(device_t dev)
89{
90	struct		pl190_intc_softc *sc = device_get_softc(dev);
91	uint32_t	id;
92	int		i, rid;
93
94	sc->sc_dev = dev;
95
96	if (pl190_intc_sc)
97		return (ENXIO);
98
99	/* Request memory resources */
100	rid = 0;
101	sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
102	    RF_ACTIVE);
103	if (sc->intc_res == NULL) {
104		device_printf(dev, "Error: could not allocate memory resources\n");
105		return (ENXIO);
106	}
107
108	pl190_intc_sc = sc;
109	/*
110	 * All interrupts should use IRQ line
111	 */
112	intc_vic_write_4(VICINTSELECT, 0x00000000);
113	/* Disable all interrupts */
114	intc_vic_write_4(VICINTENCLEAR, 0xffffffff);
115	/* Enable INT31, SIC IRQ */
116	intc_vic_write_4(VICINTENABLE, (1U << 31));
117
118	id = 0;
119	for (i = 3; i >= 0; i--) {
120		id = (id << 8) |
121		     (intc_vic_read_4(VICPERIPHID + i*4) & 0xff);
122	}
123
124	device_printf(dev, "Peripheral ID: %08x\n", id);
125
126	id = 0;
127	for (i = 3; i >= 0; i--) {
128		id = (id << 8) |
129		     (intc_vic_read_4(VICPRIMECELLID + i*4) & 0xff);
130	}
131
132	device_printf(dev, "PrimeCell ID: %08x\n", id);
133
134	return (0);
135}
136
137static device_method_t pl190_intc_methods[] = {
138	DEVMETHOD(device_probe,		pl190_intc_probe),
139	DEVMETHOD(device_attach,	pl190_intc_attach),
140	{ 0, 0 }
141};
142
143static driver_t pl190_intc_driver = {
144	"intc",
145	pl190_intc_methods,
146	sizeof(struct pl190_intc_softc),
147};
148
149static devclass_t pl190_intc_devclass;
150
151DRIVER_MODULE(intc, simplebus, pl190_intc_driver, pl190_intc_devclass, 0, 0);
152
153int
154arm_get_next_irq(int last_irq)
155{
156	uint32_t pending;
157	int32_t irq = last_irq + 1;
158
159	/* Sanity check */
160	if (irq < 0)
161		irq = 0;
162
163	pending = intc_vic_read_4(VICIRQSTATUS);
164	while (irq < VIC_NIRQS) {
165		if (pending & (1 << irq))
166			return (irq);
167		irq++;
168	}
169
170	return (-1);
171}
172
173void
174arm_mask_irq(uintptr_t nb)
175{
176
177	dprintf("%s: %d\n", __func__, nb);
178	intc_vic_write_4(VICINTENCLEAR, (1 << nb));
179}
180
181void
182arm_unmask_irq(uintptr_t nb)
183{
184
185	dprintf("%s: %d\n", __func__, nb);
186	intc_vic_write_4(VICINTENABLE, (1 << nb));
187}
188