1 /*
2 * Copyright 2012 Nouveau Community
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Martin Peres
23 */
24 #include <subdev/bios.h>
25 #include <subdev/bios/dcb.h>
26 #include <subdev/bios/extdev.h>
27
28 static u16
extdev_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * len,u8 * cnt)29 extdev_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
30 {
31 u8 dcb_ver, dcb_hdr, dcb_cnt, dcb_len;
32 u16 dcb, extdev = 0;
33
34 dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len);
35 if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40 && dcb_ver != 0x41))
36 return 0x0000;
37
38 extdev = nvbios_rd16(bios, dcb + 18);
39 if (!extdev)
40 return 0x0000;
41
42 *ver = nvbios_rd08(bios, extdev + 0);
43 *hdr = nvbios_rd08(bios, extdev + 1);
44 *cnt = nvbios_rd08(bios, extdev + 2);
45 *len = nvbios_rd08(bios, extdev + 3);
46 return extdev + *hdr;
47 }
48
49 bool
nvbios_extdev_skip_probe(struct nvkm_bios * bios)50 nvbios_extdev_skip_probe(struct nvkm_bios *bios)
51 {
52 u8 ver, hdr, len, cnt;
53 u16 data = extdev_table(bios, &ver, &hdr, &len, &cnt);
54 if (data && ver == 0x40 && hdr >= 5) {
55 u8 flags = nvbios_rd08(bios, data - hdr + 4);
56 if (flags & 1)
57 return true;
58 }
59 return false;
60 }
61
62 static u16
nvbios_extdev_entry(struct nvkm_bios * bios,int idx,u8 * ver,u8 * len)63 nvbios_extdev_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
64 {
65 u8 hdr, cnt;
66 u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt);
67 if (extdev && idx < cnt)
68 return extdev + idx * *len;
69 return 0x0000;
70 }
71
72 static void
extdev_parse_entry(struct nvkm_bios * bios,u16 offset,struct nvbios_extdev_func * entry)73 extdev_parse_entry(struct nvkm_bios *bios, u16 offset,
74 struct nvbios_extdev_func *entry)
75 {
76 entry->type = nvbios_rd08(bios, offset + 0);
77 entry->addr = nvbios_rd08(bios, offset + 1);
78 entry->bus = (nvbios_rd08(bios, offset + 2) >> 4) & 1;
79 }
80
81 int
nvbios_extdev_parse(struct nvkm_bios * bios,int idx,struct nvbios_extdev_func * func)82 nvbios_extdev_parse(struct nvkm_bios *bios, int idx,
83 struct nvbios_extdev_func *func)
84 {
85 u8 ver, len;
86 u16 entry;
87
88 if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len)))
89 return -EINVAL;
90
91 extdev_parse_entry(bios, entry, func);
92 return 0;
93 }
94
95 int
nvbios_extdev_find(struct nvkm_bios * bios,enum nvbios_extdev_type type,struct nvbios_extdev_func * func)96 nvbios_extdev_find(struct nvkm_bios *bios, enum nvbios_extdev_type type,
97 struct nvbios_extdev_func *func)
98 {
99 u8 ver, len, i;
100 u16 entry;
101
102 i = 0;
103 while ((entry = nvbios_extdev_entry(bios, i++, &ver, &len))) {
104 extdev_parse_entry(bios, entry, func);
105 if (func->type == type)
106 return 0;
107 }
108
109 return -EINVAL;
110 }
111