1 /* $NetBSD: nouveau_nvkm_subdev_bios_fan.c,v 1.4 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2014 Martin Peres
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 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_fan.c,v 1.4 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include <subdev/bios.h>
30 #include <subdev/bios/bit.h>
31 #include <subdev/bios/fan.h>
32
33 static u32
nvbios_fan_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)34 nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
35 {
36 struct bit_entry bit_P;
37 u32 fan = 0;
38
39 if (!bit_entry(bios, 'P', &bit_P)) {
40 if (bit_P.version == 2 && bit_P.length >= 0x5c)
41 fan = nvbios_rd32(bios, bit_P.offset + 0x58);
42
43 if (fan) {
44 *ver = nvbios_rd08(bios, fan + 0);
45 switch (*ver) {
46 case 0x10:
47 *hdr = nvbios_rd08(bios, fan + 1);
48 *len = nvbios_rd08(bios, fan + 2);
49 *cnt = nvbios_rd08(bios, fan + 3);
50 return fan;
51 default:
52 break;
53 }
54 }
55 }
56
57 return 0;
58 }
59
60 static u32
nvbios_fan_entry(struct nvkm_bios * bios,int idx,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)61 nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
62 u8 *cnt, u8 *len)
63 {
64 u32 data = nvbios_fan_table(bios, ver, hdr, cnt, len);
65 if (data && idx < *cnt)
66 return data + *hdr + (idx * (*len));
67 return 0;
68 }
69
70 u32
nvbios_fan_parse(struct nvkm_bios * bios,struct nvbios_therm_fan * fan)71 nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
72 {
73 u8 ver, hdr, cnt, len;
74
75 u32 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len);
76 if (data) {
77 u8 type = nvbios_rd08(bios, data + 0x00);
78 switch (type) {
79 case 0:
80 fan->type = NVBIOS_THERM_FAN_TOGGLE;
81 break;
82 case 1:
83 case 2:
84 /* TODO: Understand the difference between the two! */
85 fan->type = NVBIOS_THERM_FAN_PWM;
86 break;
87 default:
88 fan->type = NVBIOS_THERM_FAN_UNK;
89 }
90
91 fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
92 fan->min_duty = nvbios_rd08(bios, data + 0x02);
93 fan->max_duty = nvbios_rd08(bios, data + 0x03);
94
95 fan->pwm_freq = nvbios_rd32(bios, data + 0x0b) & 0xffffff;
96 }
97
98 return data;
99 }
100