volt.c

  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
 28u32
 29nvbios_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
 68u32
 69nvbios_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		if (!info->max)
100			info->max = max(info->base, info->base + info->step * info->vidmask);
101		break;
102	case 0x50:
103		info->min     = nvbios_rd32(bios, volt + 0x0a);
104		info->max     = nvbios_rd32(bios, volt + 0x0e);
105		info->base    = nvbios_rd32(bios, volt + 0x12) & 0x00ffffff;
106
107		/* offset 4 seems to be a flag byte */
108		if (nvbios_rd32(bios, volt + 0x4) & 1) {
109			info->type      = NVBIOS_VOLT_PWM;
110			info->pwm_freq  = nvbios_rd32(bios, volt + 0x5) / 1000;
111			info->pwm_range = nvbios_rd32(bios, volt + 0x16);
112		} else {
113			info->type    = NVBIOS_VOLT_GPIO;
114			info->vidmask = nvbios_rd08(bios, volt + 0x06);
115			info->step    = nvbios_rd16(bios, volt + 0x16);
116			info->ranged  =
117				!!(nvbios_rd08(bios, volt + 0x4) & 0x2);
118		}
119		break;
120	}
121	return volt;
122}
123
124u32
125nvbios_volt_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
126{
127	u8  hdr, cnt;
128	u32 volt = nvbios_volt_table(bios, ver, &hdr, &cnt, len);
129	if (volt && idx < cnt) {
130		volt = volt + hdr + (idx * *len);
131		return volt;
132	}
133	return 0;
134}
135
136u32
137nvbios_volt_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
138			struct nvbios_volt_entry *info)
139{
140	u32 volt = nvbios_volt_entry(bios, idx, ver, len);
141	memset(info, 0x00, sizeof(*info));
142	switch (!!volt * *ver) {
143	case 0x12:
144	case 0x20:
145		info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
146		info->vid     = nvbios_rd08(bios, volt + 0x01);
147		break;
148	case 0x30:
149		info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
150		info->vid     = nvbios_rd08(bios, volt + 0x01) >> 2;
151		break;
152	case 0x40:
153		break;
154	case 0x50:
155		info->voltage = nvbios_rd32(bios, volt) & 0x001fffff;
156		info->vid     = (nvbios_rd32(bios, volt) >> 23) & 0xff;
157		break;
158	}
159	return volt;
160}