xref: /freebsd/sys/dev/virtio/mmio/virtio_mmio_acpi.c (revision 3ff01b231dfa83d518854c63e7c9cd1debd1139e)
1 /*-
2  * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
3  * Copyright (c) 2014 The FreeBSD Foundation
4  * All rights reserved.
5  *
6  * This software was developed by SRI International and the University of
7  * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
8  * ("CTSRD"), as part of the DARPA CRASH research programme.
9  *
10  * Portions of this software were developed by Andrew Turner
11  * under sponsorship from the FreeBSD Foundation.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 /*
36  * VirtIO MMIO interface.
37  * This driver is heavily based on VirtIO PCI interface driver.
38  */
39 
40 #include "opt_acpi.h"
41 
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44 
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/bus.h>
48 #include <sys/kernel.h>
49 #include <sys/module.h>
50 
51 #include <contrib/dev/acpica/include/acpi.h>
52 #include <dev/acpica/acpivar.h>
53 
54 #include <dev/virtio/mmio/virtio_mmio.h>
55 
56 static int	vtmmio_acpi_probe(device_t);
57 
58 static device_method_t vtmmio_acpi_methods[] = {
59 	/* Device interface. */
60 	DEVMETHOD(device_probe,		vtmmio_acpi_probe),
61 
62 	DEVMETHOD_END
63 };
64 
65 DEFINE_CLASS_1(virtio_mmio, vtmmio_acpi_driver, vtmmio_acpi_methods,
66     sizeof(struct vtmmio_softc), vtmmio_driver);
67 
68 static devclass_t vtmmio_acpi_devclass;
69 
70 DRIVER_MODULE(virtio_mmio, acpi, vtmmio_acpi_driver, vtmmio_acpi_devclass, 0,0);
71 MODULE_DEPEND(virtio_mmio, acpi, 1, 1, 1);
72 
73 static int
74 vtmmio_acpi_probe(device_t dev)
75 {
76 	ACPI_HANDLE h;
77 
78 	if ((h = acpi_get_handle(dev)) == NULL)
79 		return (ENXIO);
80 
81 	if (!acpi_MatchHid(h, "LNRO0005"))
82 		return (ENXIO);
83 
84 	return (vtmmio_probe(dev));
85 }
86