1 /* 2 * Copyright 2014 Martin Peres 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/fan.h> 27 28 u16 29 nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 30 { 31 struct bit_entry bit_P; 32 u16 fan = 0x0000; 33 34 if (!bit_entry(bios, 'P', &bit_P)) { 35 if (bit_P.version == 2 && bit_P.length >= 0x5a) 36 fan = nv_ro16(bios, bit_P.offset + 0x58); 37 38 if (fan) { 39 *ver = nv_ro08(bios, fan + 0); 40 switch (*ver) { 41 case 0x10: 42 *hdr = nv_ro08(bios, fan + 1); 43 *len = nv_ro08(bios, fan + 2); 44 *cnt = nv_ro08(bios, fan + 3); 45 return fan; 46 default: 47 break; 48 } 49 } 50 } 51 52 return 0x0000; 53 } 54 55 u16 56 nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr, 57 u8 *cnt, u8 *len) 58 { 59 u16 data = nvbios_fan_table(bios, ver, hdr, cnt, len); 60 if (data && idx < *cnt) 61 return data + *hdr + (idx * (*len)); 62 return 0x0000; 63 } 64 65 u16 66 nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan) 67 { 68 u8 ver, hdr, cnt, len; 69 70 u16 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len); 71 if (data) { 72 u8 type = nv_ro08(bios, data + 0x00); 73 switch (type) { 74 case 0: 75 fan->type = NVBIOS_THERM_FAN_TOGGLE; 76 break; 77 case 1: 78 case 2: 79 /* TODO: Understand the difference between the two! */ 80 fan->type = NVBIOS_THERM_FAN_PWM; 81 break; 82 default: 83 fan->type = NVBIOS_THERM_FAN_UNK; 84 } 85 86 fan->min_duty = nv_ro08(bios, data + 0x02); 87 fan->max_duty = nv_ro08(bios, data + 0x03); 88 89 fan->pwm_freq = nv_ro32(bios, data + 0x0b) & 0xffffff; 90 } 91 92 return data; 93 } 94