1 /* $NetBSD: nouveau_nvkm_subdev_bios_power_budget.c,v 1.2 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2016 Karol Herbst
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: Karol Herbst
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_power_budget.c,v 1.2 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include <subdev/bios.h>
30 #include <subdev/bios/bit.h>
31 #include <subdev/bios/power_budget.h>
32
33 static u32
nvbios_power_budget_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)34 nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
35 u8 *len)
36 {
37 struct bit_entry bit_P;
38 u32 power_budget;
39
40 if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
41 bit_P.length < 0x30)
42 return 0;
43
44 power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
45 if (!power_budget)
46 return 0;
47
48 *ver = nvbios_rd08(bios, power_budget);
49 switch (*ver) {
50 case 0x20:
51 case 0x30:
52 *hdr = nvbios_rd08(bios, power_budget + 0x1);
53 *len = nvbios_rd08(bios, power_budget + 0x2);
54 *cnt = nvbios_rd08(bios, power_budget + 0x3);
55 return power_budget;
56 default:
57 break;
58 }
59
60 return 0;
61 }
62
63 int
nvbios_power_budget_header(struct nvkm_bios * bios,struct nvbios_power_budget * budget)64 nvbios_power_budget_header(struct nvkm_bios *bios,
65 struct nvbios_power_budget *budget)
66 {
67 struct nvkm_subdev *subdev = &bios->subdev;
68 u8 ver, hdr, cnt, len, cap_entry;
69 u32 header;
70
71 if (!bios || !budget)
72 return -EINVAL;
73
74 header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
75 if (!header || !cnt)
76 return -ENODEV;
77
78 switch (ver) {
79 case 0x20:
80 cap_entry = nvbios_rd08(bios, header + 0x9);
81 break;
82 case 0x30:
83 cap_entry = nvbios_rd08(bios, header + 0xa);
84 break;
85 default:
86 cap_entry = 0xff;
87 }
88
89 if (cap_entry >= cnt && cap_entry != 0xff) {
90 nvkm_warn(subdev,
91 "invalid cap_entry in power budget table found\n");
92 budget->cap_entry = 0xff;
93 return -EINVAL;
94 }
95
96 budget->offset = header;
97 budget->ver = ver;
98 budget->hlen = hdr;
99 budget->elen = len;
100 budget->ecount = cnt;
101
102 budget->cap_entry = cap_entry;
103
104 return 0;
105 }
106
107 int
nvbios_power_budget_entry(struct nvkm_bios * bios,struct nvbios_power_budget * budget,u8 idx,struct nvbios_power_budget_entry * entry)108 nvbios_power_budget_entry(struct nvkm_bios *bios,
109 struct nvbios_power_budget *budget,
110 u8 idx, struct nvbios_power_budget_entry *entry)
111 {
112 u32 entry_offset;
113
114 if (!bios || !budget || !budget->offset || idx >= budget->ecount
115 || !entry)
116 return -EINVAL;
117
118 entry_offset = budget->offset + budget->hlen + idx * budget->elen;
119
120 if (budget->ver >= 0x20) {
121 entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
122 entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
123 entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
124 } else {
125 entry->min_w = 0;
126 entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
127 entry->avg_w = entry->max_w;
128 }
129
130 return 0;
131 }
132