1 /*
2 * Copyright 2014 Martin Peres
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/bit.h>
26 #include <subdev/bios/fan.h>
27
28 static u32
29 nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30 {
31 struct bit_entry bit_P;
32 u32 fan = 0;
33
34 if (!bit_entry(bios, 'P', &bit_P)) {
35 if (bit_P.version == 2 && bit_P.length >= 0x5c)
36 fan = nvbios_rd32(bios, bit_P.offset + 0x58);
37
38 if (fan) {
39 *ver = nvbios_rd08(bios, fan + 0);
40 switch (*ver) {
41 case 0x10:
42 *hdr = nvbios_rd08(bios, fan + 1);
43 *len = nvbios_rd08(bios, fan + 2);
44 *cnt = nvbios_rd08(bios, fan + 3);
45 return fan;
46 default:
47 break;
48 }
49 }
50 }
51
52 return 0;
53 }
54
55 static u32
56 nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
57 u8 *cnt, u8 *len)
58 {
59 u32 data = nvbios_fan_table(bios, ver, hdr, cnt, len);
60 if (data && idx < *cnt)
61 return data + *hdr + (idx * (*len));
62 return 0;
63 }
64
65 u32
66 nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
67 {
68 u8 ver, hdr, cnt, len;
69
70 u32 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len);
71 if (data) {
72 u8 type = nvbios_rd08(bios, data + 0x00);
73 switch (type) {
74 case 0:
75 fan->type = NVBIOS_THERM_FAN_TOGGLE;
76 break;
77 case 1:
78 case 2:
79 /* TODO: Understand the difference between the two! */
80 fan->type = NVBIOS_THERM_FAN_PWM;
81 break;
82 default:
83 fan->type = NVBIOS_THERM_FAN_UNK;
84 }
85
86 fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
87 fan->min_duty = nvbios_rd08(bios, data + 0x02);
88 fan->max_duty = nvbios_rd08(bios, data + 0x03);
89
90 fan->pwm_freq = nvbios_rd32(bios, data + 0x0b) & 0xffffff;
91 }
92
93 return data;
94 }