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
28u16
29nvbios_volt_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30{
31	struct bit_entry bit_P;
32	u16 volt = 0x0000;
33
34	if (!bit_entry(bios, 'P', &bit_P)) {
35		if (bit_P.version == 2)
36			volt = nvbios_rd16(bios, bit_P.offset + 0x0c);
37		else
38		if (bit_P.version == 1)
39			volt = nvbios_rd16(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 0x0000;
66}
67
68u16
69nvbios_volt_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
70		  struct nvbios_volt *info)
71{
72	u16 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		break;
79	case 0x20:
80		info->type    = NVBIOS_VOLT_GPIO;
81		info->vidmask = nvbios_rd08(bios, volt + 0x05);
82		break;
83	case 0x30:
84		info->type    = NVBIOS_VOLT_GPIO;
85		info->vidmask = nvbios_rd08(bios, volt + 0x04);
86		break;
87	case 0x40:
88		info->type    = NVBIOS_VOLT_GPIO;
89		info->base    = nvbios_rd32(bios, volt + 0x04);
90		info->step    = nvbios_rd16(bios, volt + 0x08);
91		info->vidmask = nvbios_rd08(bios, volt + 0x0b);
92		/*XXX*/
93		info->min     = 0;
94		info->max     = info->base;
95		break;
96	case 0x50:
97		info->min     = nvbios_rd32(bios, volt + 0x0a);
98		info->max     = nvbios_rd32(bios, volt + 0x0e);
99		info->base    = nvbios_rd32(bios, volt + 0x12) & 0x00ffffff;
100
101		/* offset 4 seems to be a flag byte */
102		if (nvbios_rd32(bios, volt + 0x4) & 1) {
103			info->type      = NVBIOS_VOLT_PWM;
104			info->pwm_freq  = nvbios_rd32(bios, volt + 0x5) / 1000;
105			info->pwm_range = nvbios_rd32(bios, volt + 0x16);
106		} else {
107			info->type      = NVBIOS_VOLT_GPIO;
108			info->vidmask   = nvbios_rd08(bios, volt + 0x06);
109			info->step      = nvbios_rd16(bios, volt + 0x16);
110		}
111		break;
112	}
113	return volt;
114}
115
116u16
117nvbios_volt_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
118{
119	u8  hdr, cnt;
120	u16 volt = nvbios_volt_table(bios, ver, &hdr, &cnt, len);
121	if (volt && idx < cnt) {
122		volt = volt + hdr + (idx * *len);
123		return volt;
124	}
125	return 0x0000;
126}
127
128u16
129nvbios_volt_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
130			struct nvbios_volt_entry *info)
131{
132	u16 volt = nvbios_volt_entry(bios, idx, ver, len);
133	memset(info, 0x00, sizeof(*info));
134	switch (!!volt * *ver) {
135	case 0x12:
136	case 0x20:
137		info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
138		info->vid     = nvbios_rd08(bios, volt + 0x01);
139		break;
140	case 0x30:
141		info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
142		info->vid     = nvbios_rd08(bios, volt + 0x01) >> 2;
143		break;
144	case 0x40:
145	case 0x50:
146		break;
147	}
148	return volt;
149}
150