1 /*
2  * Copyright 2012 Nouveau Community
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/volt.h>
27 
28 u32
29 nvbios_volt_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30 {
31 	struct bit_entry bit_P;
32 	u32 volt = 0;
33 
34 	if (!bit_entry(bios, 'P', &bit_P)) {
35 		if (bit_P.version == 2)
36 			volt = nvbios_rd32(bios, bit_P.offset + 0x0c);
37 		else
38 		if (bit_P.version == 1)
39 			volt = nvbios_rd32(bios, bit_P.offset + 0x10);
40 
41 		if (volt) {
42 			*ver = nvbios_rd08(bios, volt + 0);
43 			switch (*ver) {
44 			case 0x12:
45 				*hdr = 5;
46 				*cnt = nvbios_rd08(bios, volt + 2);
47 				*len = nvbios_rd08(bios, volt + 1);
48 				return volt;
49 			case 0x20:
50 				*hdr = nvbios_rd08(bios, volt + 1);
51 				*cnt = nvbios_rd08(bios, volt + 2);
52 				*len = nvbios_rd08(bios, volt + 3);
53 				return volt;
54 			case 0x30:
55 			case 0x40:
56 			case 0x50:
57 				*hdr = nvbios_rd08(bios, volt + 1);
58 				*cnt = nvbios_rd08(bios, volt + 3);
59 				*len = nvbios_rd08(bios, volt + 2);
60 				return volt;
61 			}
62 		}
63 	}
64 
65 	return 0;
66 }
67 
68 u32
69 nvbios_volt_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
70 		  struct nvbios_volt *info)
71 {
72 	u32 volt = nvbios_volt_table(bios, ver, hdr, cnt, len);
73 	memset(info, 0x00, sizeof(*info));
74 	switch (!!volt * *ver) {
75 	case 0x12:
76 		info->type    = NVBIOS_VOLT_GPIO;
77 		info->vidmask = nvbios_rd08(bios, volt + 0x04);
78 		info->ranged  = false;
79 		break;
80 	case 0x20:
81 		info->type    = NVBIOS_VOLT_GPIO;
82 		info->vidmask = nvbios_rd08(bios, volt + 0x05);
83 		info->ranged  = false;
84 		break;
85 	case 0x30:
86 		info->type    = NVBIOS_VOLT_GPIO;
87 		info->vidmask = nvbios_rd08(bios, volt + 0x04);
88 		info->ranged  = false;
89 		break;
90 	case 0x40:
91 		info->type    = NVBIOS_VOLT_GPIO;
92 		info->base    = nvbios_rd32(bios, volt + 0x04);
93 		info->step    = nvbios_rd16(bios, volt + 0x08);
94 		info->vidmask = nvbios_rd08(bios, volt + 0x0b);
95 		info->ranged  = true; /* XXX: find the flag byte */
96 		info->min     = min(info->base,
97 				    info->base + info->step * info->vidmask);
98 		info->max     = nvbios_rd32(bios, volt + 0x0e);
99 		break;
100 	case 0x50:
101 		info->min     = nvbios_rd32(bios, volt + 0x0a);
102 		info->max     = nvbios_rd32(bios, volt + 0x0e);
103 		info->base    = nvbios_rd32(bios, volt + 0x12) & 0x00ffffff;
104 
105 		/* offset 4 seems to be a flag byte */
106 		if (nvbios_rd32(bios, volt + 0x4) & 1) {
107 			info->type      = NVBIOS_VOLT_PWM;
108 			info->pwm_freq  = nvbios_rd32(bios, volt + 0x5) / 1000;
109 			info->pwm_range = nvbios_rd32(bios, volt + 0x16);
110 		} else {
111 			info->type    = NVBIOS_VOLT_GPIO;
112 			info->vidmask = nvbios_rd08(bios, volt + 0x06);
113 			info->step    = nvbios_rd16(bios, volt + 0x16);
114 			info->ranged  =
115 				!!(nvbios_rd08(bios, volt + 0x4) & 0x2);
116 		}
117 		break;
118 	}
119 	return volt;
120 }
121 
122 u32
123 nvbios_volt_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
124 {
125 	u8  hdr, cnt;
126 	u32 volt = nvbios_volt_table(bios, ver, &hdr, &cnt, len);
127 	if (volt && idx < cnt) {
128 		volt = volt + hdr + (idx * *len);
129 		return volt;
130 	}
131 	return 0;
132 }
133 
134 u32
135 nvbios_volt_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
136 			struct nvbios_volt_entry *info)
137 {
138 	u32 volt = nvbios_volt_entry(bios, idx, ver, len);
139 	memset(info, 0x00, sizeof(*info));
140 	switch (!!volt * *ver) {
141 	case 0x12:
142 	case 0x20:
143 		info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
144 		info->vid     = nvbios_rd08(bios, volt + 0x01);
145 		break;
146 	case 0x30:
147 		info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
148 		info->vid     = nvbios_rd08(bios, volt + 0x01) >> 2;
149 		break;
150 	case 0x40:
151 		break;
152 	case 0x50:
153 		info->voltage = nvbios_rd32(bios, volt) & 0x001fffff;
154 		info->vid     = (nvbios_rd32(bios, volt) >> 23) & 0xff;
155 		break;
156 	}
157 	return volt;
158 }
159