versatile_sic.c revision 266152 
1/*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
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/versatile/versatile_sic.c 266152 2014-05-15 16:11:06Z ian $");
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	SIC_STATUS	0x00
53#define	SIC_RAWSTAT	0x04
54#define	SIC_ENABLE	0x08
55#define	SIC_ENSET	0x08
56#define	SIC_ENCLR	0x0C
57#define	SIC_SOFTINTSET	0x10
58#define	SIC_SOFTINTCLR	0x14
59#define	SIC_PICENABLE	0x20
60#define	SIC_PICENSET	0x20
61#define	SIC_PICENCLR	0x24
62
63struct versatile_sic_softc {
64	device_t		sc_dev;
65	struct resource *	mem_res;
66};
67
68#define	sic_read_4(sc, reg)			\
69    bus_read_4(sc->mem_res, (reg))
70#define	sic_write_4(sc, reg, val)		\
71    bus_write_4(sc->mem_res, (reg), (val))
72
73static int
74versatile_sic_probe(device_t dev)
75{
76
77	if (!ofw_bus_status_okay(dev))
78		return (ENXIO);
79
80	if (!ofw_bus_is_compatible(dev, "arm,versatile-sic"))
81		return (ENXIO);
82	device_set_desc(dev, "ARM Versatile SIC");
83	return (BUS_PROBE_DEFAULT);
84}
85
86static int
87versatile_sic_attach(device_t dev)
88{
89	struct		versatile_sic_softc *sc = device_get_softc(dev);
90	uint32_t	pass_irqs;
91	int		rid;
92
93	sc->sc_dev = dev;
94
95	/* Request memory resources */
96	rid = 0;
97	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
98	    RF_ACTIVE);
99	if (sc->mem_res == NULL) {
100		device_printf(dev, "Error: could not allocate memory resources\n");
101		return (ENXIO);
102	}
103
104	/* Disable all interrupts on SIC */
105	sic_write_4(sc, SIC_ENCLR, 0xffffffff);
106
107	/*
108	 * XXX: Enable IRQ3 for KMI
109	 * Should be replaced by proper interrupts cascading
110	 */
111	sic_write_4(sc, SIC_ENSET, (1 << 3));
112
113	/*
114	 * Let PCI and Ethernet interrupts pass through
115	 * IRQ25, IRQ27..IRQ31
116	 */
117	pass_irqs = (0x1f << 27) | (1 << 25);
118	sic_write_4(sc, SIC_PICENSET, pass_irqs);
119
120	return (0);
121}
122
123static device_method_t versatile_sic_methods[] = {
124	DEVMETHOD(device_probe,		versatile_sic_probe),
125	DEVMETHOD(device_attach,	versatile_sic_attach),
126	{ 0, 0 }
127};
128
129static driver_t versatile_sic_driver = {
130	"sic",
131	versatile_sic_methods,
132	sizeof(struct versatile_sic_softc),
133};
134
135static devclass_t versatile_sic_devclass;
136
137DRIVER_MODULE(sic, simplebus, versatile_sic_driver, versatile_sic_devclass, 0, 0);
138