1 /* $NetBSD: qemufwcfg_fdt.c,v 1.2 2021/01/27 03:10:21 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_fdt.c,v 1.2 2021/01/27 03:10:21 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/fdt/fdtvar.h>
39
40 #include <dev/ic/qemufwcfgvar.h>
41
42 static int fwcfg_fdt_match(device_t, cfdata_t, void *);
43 static void fwcfg_fdt_attach(device_t, device_t, void *);
44
45 CFATTACH_DECL_NEW(qemufwcfg_fdt, sizeof(struct fwcfg_softc),
46 fwcfg_fdt_match,
47 fwcfg_fdt_attach,
48 NULL,
49 NULL
50 );
51
52 static const struct device_compatible_entry compat_data[] = {
53 { .compat = "qemu,fw-cfg-mmio" },
54 DEVICE_COMPAT_EOL
55 };
56
57
58 static int
fwcfg_fdt_match(device_t parent,cfdata_t match,void * opaque)59 fwcfg_fdt_match(device_t parent, cfdata_t match, void *opaque)
60 {
61 struct fdt_attach_args * const faa = opaque;
62
63 return of_compatible_match(faa->faa_phandle, compat_data);
64 }
65
66 static void
fwcfg_fdt_attach(device_t parent,device_t self,void * opaque)67 fwcfg_fdt_attach(device_t parent, device_t self, void *opaque)
68 {
69 struct fwcfg_softc *sc = device_private(self);
70 struct fdt_attach_args * const faa = opaque;
71 bus_addr_t base;
72 bus_size_t size;
73
74 if (fdtbus_get_reg(faa->faa_phandle, 0, &base, &size) != 0) {
75 aprint_error_dev(self, "couldn't get registers\n");
76 return;
77 }
78
79 sc->sc_dev = self;
80 sc->sc_bst = faa->faa_bst;
81
82 if (bus_space_map(sc->sc_bst, base, size, 0, &sc->sc_bsh) != 0) {
83 aprint_error_dev(self, "couldn't map registers\n");
84 return;
85 }
86
87 aprint_naive("\n");
88 aprint_normal("\n");
89
90 fwcfg_attach(sc);
91
92 pmf_device_register(self, NULL, NULL);
93 }
94