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