1 /* $NetBSD: qemufwcfg_acpi.c,v 1.2 2021/01/29 15:49:55 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: qemufwcfg_acpi.c,v 1.2 2021/01/29 15:49:55 thorpej Exp $");
31
32 #include <sys/param.h>
33 #include <sys/device.h>
34 #include <sys/systm.h>
35 #include <sys/mutex.h>
36 #include <sys/bus.h>
37
38 #include <dev/acpi/acpireg.h>
39 #include <dev/acpi/acpivar.h>
40
41 #include <dev/ic/qemufwcfgvar.h>
42
43 #define _COMPONENT ACPI_RESOURCE_COMPONENT
44 ACPI_MODULE_NAME ("qemufwcfg_acpi")
45
46 static int fwcfg_acpi_match(device_t, cfdata_t, void *);
47 static void fwcfg_acpi_attach(device_t, device_t, void *);
48
49 CFATTACH_DECL_NEW(qemufwcfg_acpi, sizeof(struct fwcfg_softc),
50 fwcfg_acpi_match,
51 fwcfg_acpi_attach,
52 NULL,
53 NULL
54 );
55
56 static const struct device_compatible_entry compat_data[] = {
57 { .compat = "QEMU0002" },
58 DEVICE_COMPAT_EOL
59 };
60
61 static int
fwcfg_acpi_match(device_t parent,cfdata_t match,void * opaque)62 fwcfg_acpi_match(device_t parent, cfdata_t match, void *opaque)
63 {
64 struct acpi_attach_args *aa = opaque;
65
66 return acpi_compatible_match(aa, compat_data);
67 }
68
69 static void
fwcfg_acpi_attach(device_t parent,device_t self,void * opaque)70 fwcfg_acpi_attach(device_t parent, device_t self, void *opaque)
71 {
72 struct fwcfg_softc *sc = device_private(self);
73 struct acpi_attach_args *aa = opaque;
74 struct acpi_resources res;
75 struct acpi_mem *mem;
76 struct acpi_io *io;
77 bus_addr_t base;
78 bus_size_t size;
79 ACPI_STATUS rv;
80
81 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
82 &res, &acpi_resource_parse_ops_default);
83 if (ACPI_FAILURE(rv))
84 return;
85
86 sc->sc_dev = self;
87
88 if ((io = acpi_res_io(&res, 0)) != NULL) {
89 sc->sc_bst = aa->aa_iot;
90 base = io->ar_base;
91 size = io->ar_length;
92 } else if ((mem = acpi_res_mem(&res, 0)) != NULL) {
93 sc->sc_bst = aa->aa_memt;
94 base = mem->ar_base;
95 size = mem->ar_length;
96 } else {
97 aprint_error_dev(self, "couldn't acquire resources\n");
98 return;
99 }
100 acpi_resource_cleanup(&res);
101
102 if (bus_space_map(sc->sc_bst, base, size, 0, &sc->sc_bsh) != 0) {
103 aprint_error_dev(self, "couldn't map registers\n");
104 return;
105 }
106
107 fwcfg_attach(sc);
108
109 pmf_device_register(self, NULL, NULL);
110 }
111