1 /*
2 * Copyright 2016 Karol Herbst
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: Karol Herbst
23 */
24 #include <subdev/bios.h>
25 #include <subdev/bios/bit.h>
26 #include <subdev/bios/power_budget.h>
27
28 static u32
nvbios_power_budget_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)29 nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
30 u8 *len)
31 {
32 struct bit_entry bit_P;
33 u32 power_budget;
34
35 if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
36 bit_P.length < 0x30)
37 return 0;
38
39 power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
40 if (!power_budget)
41 return 0;
42
43 *ver = nvbios_rd08(bios, power_budget);
44 switch (*ver) {
45 case 0x20:
46 case 0x30:
47 *hdr = nvbios_rd08(bios, power_budget + 0x1);
48 *len = nvbios_rd08(bios, power_budget + 0x2);
49 *cnt = nvbios_rd08(bios, power_budget + 0x3);
50 return power_budget;
51 default:
52 break;
53 }
54
55 return 0;
56 }
57
58 int
nvbios_power_budget_header(struct nvkm_bios * bios,struct nvbios_power_budget * budget)59 nvbios_power_budget_header(struct nvkm_bios *bios,
60 struct nvbios_power_budget *budget)
61 {
62 struct nvkm_subdev *subdev = &bios->subdev;
63 u8 ver, hdr, cnt, len, cap_entry;
64 u32 header;
65
66 if (!bios || !budget)
67 return -EINVAL;
68
69 header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
70 if (!header || !cnt)
71 return -ENODEV;
72
73 switch (ver) {
74 case 0x20:
75 cap_entry = nvbios_rd08(bios, header + 0x9);
76 break;
77 case 0x30:
78 cap_entry = nvbios_rd08(bios, header + 0xa);
79 break;
80 default:
81 cap_entry = 0xff;
82 }
83
84 if (cap_entry >= cnt && cap_entry != 0xff) {
85 nvkm_warn(subdev,
86 "invalid cap_entry in power budget table found\n");
87 budget->cap_entry = 0xff;
88 return -EINVAL;
89 }
90
91 budget->offset = header;
92 budget->ver = ver;
93 budget->hlen = hdr;
94 budget->elen = len;
95 budget->ecount = cnt;
96
97 budget->cap_entry = cap_entry;
98
99 return 0;
100 }
101
102 int
nvbios_power_budget_entry(struct nvkm_bios * bios,struct nvbios_power_budget * budget,u8 idx,struct nvbios_power_budget_entry * entry)103 nvbios_power_budget_entry(struct nvkm_bios *bios,
104 struct nvbios_power_budget *budget,
105 u8 idx, struct nvbios_power_budget_entry *entry)
106 {
107 u32 entry_offset;
108
109 if (!bios || !budget || !budget->offset || idx >= budget->ecount
110 || !entry)
111 return -EINVAL;
112
113 entry_offset = budget->offset + budget->hlen + idx * budget->elen;
114
115 if (budget->ver >= 0x20) {
116 entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
117 entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
118 entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
119 } else {
120 entry->min_w = 0;
121 entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
122 entry->avg_w = entry->max_w;
123 }
124
125 return 0;
126 }
127