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
25 #include <subdev/bios.h>
26 #include <subdev/bios/bit.h>
27 #include <subdev/bios/perf.h>
28
29 static u16
perf_table(struct nouveau_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)30 perf_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
31 {
32 struct bit_entry bit_P;
33 u16 perf = 0x0000;
34
35 if (!bit_entry(bios, 'P', &bit_P)) {
36 if (bit_P.version <= 2) {
37 perf = nv_ro16(bios, bit_P.offset + 0);
38 if (perf) {
39 *ver = nv_ro08(bios, perf + 0);
40 *hdr = nv_ro08(bios, perf + 1);
41 }
42 } else
43 nv_error(bios, "unknown offset for perf in BIT P %d\n",
44 bit_P.version);
45 }
46
47 if (bios->bmp_offset) {
48 if (nv_ro08(bios, bios->bmp_offset + 6) >= 0x25) {
49 perf = nv_ro16(bios, bios->bmp_offset + 0x94);
50 if (perf) {
51 *hdr = nv_ro08(bios, perf + 0);
52 *ver = nv_ro08(bios, perf + 1);
53 }
54 }
55 }
56
57 return perf;
58 }
59
60 int
nvbios_perf_fan_parse(struct nouveau_bios * bios,struct nvbios_perf_fan * fan)61 nvbios_perf_fan_parse(struct nouveau_bios *bios,
62 struct nvbios_perf_fan *fan)
63 {
64 u8 ver = 0, hdr = 0, cnt = 0, len = 0;
65 u16 perf = perf_table(bios, &ver, &hdr, &cnt, &len);
66 if (!perf)
67 return -ENODEV;
68
69 if (ver >= 0x20 && ver < 0x40 && hdr > 6)
70 fan->pwm_divisor = nv_ro16(bios, perf + 6);
71 else
72 fan->pwm_divisor = 0;
73
74 return 0;
75 }
76