1 | /* $NetBSD: nouveau_subdev_bios_extdev.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright 2012 Nouveau Community |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a |
7 | * copy of this software and associated documentation files (the "Software"), |
8 | * to deal in the Software without restriction, including without limitation |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
10 | * and/or sell copies of the Software, and to permit persons to whom the |
11 | * Software is furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
22 | * OTHER DEALINGS IN THE SOFTWARE. |
23 | * |
24 | * Authors: Martin Peres |
25 | */ |
26 | |
27 | #include <sys/cdefs.h> |
28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_bios_extdev.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $" ); |
29 | |
30 | #include <subdev/bios.h> |
31 | #include <subdev/bios/dcb.h> |
32 | #include <subdev/bios/extdev.h> |
33 | |
34 | static u16 |
35 | extdev_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt) |
36 | { |
37 | u8 dcb_ver, dcb_hdr, dcb_cnt, dcb_len; |
38 | u16 dcb, extdev = 0; |
39 | |
40 | dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len); |
41 | if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40)) |
42 | return 0x0000; |
43 | |
44 | extdev = nv_ro16(bios, dcb + 18); |
45 | if (!extdev) |
46 | return 0x0000; |
47 | |
48 | *ver = nv_ro08(bios, extdev + 0); |
49 | *hdr = nv_ro08(bios, extdev + 1); |
50 | *cnt = nv_ro08(bios, extdev + 2); |
51 | *len = nv_ro08(bios, extdev + 3); |
52 | |
53 | return extdev + *hdr; |
54 | } |
55 | |
56 | static u16 |
57 | nvbios_extdev_entry(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len) |
58 | { |
59 | u8 hdr, cnt; |
60 | u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt); |
61 | if (extdev && idx < cnt) |
62 | return extdev + idx * *len; |
63 | return 0x0000; |
64 | } |
65 | |
66 | static void |
67 | extdev_parse_entry(struct nouveau_bios *bios, u16 offset, |
68 | struct nvbios_extdev_func *entry) |
69 | { |
70 | entry->type = nv_ro08(bios, offset + 0); |
71 | entry->addr = nv_ro08(bios, offset + 1); |
72 | entry->bus = (nv_ro08(bios, offset + 2) >> 4) & 1; |
73 | } |
74 | |
75 | int |
76 | nvbios_extdev_parse(struct nouveau_bios *bios, int idx, |
77 | struct nvbios_extdev_func *func) |
78 | { |
79 | u8 ver, len; |
80 | u16 entry; |
81 | |
82 | if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len))) |
83 | return -EINVAL; |
84 | |
85 | extdev_parse_entry(bios, entry, func); |
86 | |
87 | return 0; |
88 | } |
89 | |
90 | int |
91 | nvbios_extdev_find(struct nouveau_bios *bios, enum nvbios_extdev_type type, |
92 | struct nvbios_extdev_func *func) |
93 | { |
94 | u8 ver, len, i; |
95 | u16 entry; |
96 | |
97 | i = 0; |
98 | while (!(entry = nvbios_extdev_entry(bios, i++, &ver, &len))) { |
99 | extdev_parse_entry(bios, entry, func); |
100 | if (func->type == type) |
101 | return 0; |
102 | } |
103 | |
104 | return -EINVAL; |
105 | } |
106 | |