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 }
95