subdev/bios/volt.c

0001 /*
0002  * Copyright 2012 Nouveau Community
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Martin Peres
0023  */
0024 #include <subdev/bios.h>
0025 #include <subdev/bios/bit.h>
0026 #include <subdev/bios/volt.h>
0027
0028 u32
0029 nvbios_volt_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
0030 {
0031     struct bit_entry bit_P;
0032     u32 volt = 0;
0033
0034     if (!bit_entry(bios, 'P', &bit_P)) {
0035         if (bit_P.version == 2)
0036             volt = nvbios_rd32(bios, bit_P.offset + 0x0c);
0037         else
0038         if (bit_P.version == 1)
0039             volt = nvbios_rd32(bios, bit_P.offset + 0x10);
0040
0041         if (volt) {
0042             *ver = nvbios_rd08(bios, volt + 0);
0043             switch (*ver) {
0044             case 0x12:
0045                 *hdr = 5;
0046                 *cnt = nvbios_rd08(bios, volt + 2);
0047                 *len = nvbios_rd08(bios, volt + 1);
0048                 return volt;
0049             case 0x20:
0050                 *hdr = nvbios_rd08(bios, volt + 1);
0051                 *cnt = nvbios_rd08(bios, volt + 2);
0052                 *len = nvbios_rd08(bios, volt + 3);
0053                 return volt;
0054             case 0x30:
0055             case 0x40:
0056             case 0x50:
0057                 *hdr = nvbios_rd08(bios, volt + 1);
0058                 *cnt = nvbios_rd08(bios, volt + 3);
0059                 *len = nvbios_rd08(bios, volt + 2);
0060                 return volt;
0061             }
0062         }
0063     }
0064
0065     return 0;
0066 }
0067
0068 u32
0069 nvbios_volt_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
0070           struct nvbios_volt *info)
0071 {
0072     u32 volt = nvbios_volt_table(bios, ver, hdr, cnt, len);
0073     memset(info, 0x00, sizeof(*info));
0074     switch (!!volt * *ver) {
0075     case 0x12:
0076         info->type    = NVBIOS_VOLT_GPIO;
0077         info->vidmask = nvbios_rd08(bios, volt + 0x04);
0078         info->ranged  = false;
0079         break;
0080     case 0x20:
0081         info->type    = NVBIOS_VOLT_GPIO;
0082         info->vidmask = nvbios_rd08(bios, volt + 0x05);
0083         info->ranged  = false;
0084         break;
0085     case 0x30:
0086         info->type    = NVBIOS_VOLT_GPIO;
0087         info->vidmask = nvbios_rd08(bios, volt + 0x04);
0088         info->ranged  = false;
0089         break;
0090     case 0x40:
0091         info->type    = NVBIOS_VOLT_GPIO;
0092         info->base    = nvbios_rd32(bios, volt + 0x04);
0093         info->step    = nvbios_rd16(bios, volt + 0x08);
0094         info->vidmask = nvbios_rd08(bios, volt + 0x0b);
0095         info->ranged  = true; /* XXX: find the flag byte */
0096         info->min     = min(info->base,
0097                     info->base + info->step * info->vidmask);
0098         info->max     = nvbios_rd32(bios, volt + 0x0e);
0099         if (!info->max)
0100             info->max = max(info->base, info->base + info->step * info->vidmask);
0101         break;
0102     case 0x50:
0103         info->min     = nvbios_rd32(bios, volt + 0x0a);
0104         info->max     = nvbios_rd32(bios, volt + 0x0e);
0105         info->base    = nvbios_rd32(bios, volt + 0x12) & 0x00ffffff;
0106
0107         /* offset 4 seems to be a flag byte */
0108         if (nvbios_rd32(bios, volt + 0x4) & 1) {
0109             info->type      = NVBIOS_VOLT_PWM;
0110             info->pwm_freq  = nvbios_rd32(bios, volt + 0x5) / 1000;
0111             info->pwm_range = nvbios_rd32(bios, volt + 0x16);
0112         } else {
0113             info->type    = NVBIOS_VOLT_GPIO;
0114             info->vidmask = nvbios_rd08(bios, volt + 0x06);
0115             info->step    = nvbios_rd16(bios, volt + 0x16);
0116             info->ranged  =
0117                 !!(nvbios_rd08(bios, volt + 0x4) & 0x2);
0118         }
0119         break;
0120     }
0121     return volt;
0122 }
0123
0124 u32
0125 nvbios_volt_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
0126 {
0127     u8  hdr, cnt;
0128     u32 volt = nvbios_volt_table(bios, ver, &hdr, &cnt, len);
0129     if (volt && idx < cnt) {
0130         volt = volt + hdr + (idx * *len);
0131         return volt;
0132     }
0133     return 0;
0134 }
0135
0136 u32
0137 nvbios_volt_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
0138             struct nvbios_volt_entry *info)
0139 {
0140     u32 volt = nvbios_volt_entry(bios, idx, ver, len);
0141     memset(info, 0x00, sizeof(*info));
0142     switch (!!volt * *ver) {
0143     case 0x12:
0144     case 0x20:
0145         info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
0146         info->vid     = nvbios_rd08(bios, volt + 0x01);
0147         break;
0148     case 0x30:
0149         info->voltage = nvbios_rd08(bios, volt + 0x00) * 10000;
0150         info->vid     = nvbios_rd08(bios, volt + 0x01) >> 2;
0151         break;
0152     case 0x40:
0153         break;
0154     case 0x50:
0155         info->voltage = nvbios_rd32(bios, volt) & 0x001fffff;
0156         info->vid     = (nvbios_rd32(bios, volt) >> 23) & 0xff;
0157         break;
0158     }
0159     return volt;
0160 }