1 /* 2 * Copyright 2016 Karol Herbst 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: Karol Herbst 23 */ 24 #include <subdev/bios.h> 25 #include <subdev/bios/bit.h> 26 #include <subdev/bios/power_budget.h> 27 28 static u32 29 nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, 30 u8 *len) 31 { 32 struct bit_entry bit_P; 33 u32 power_budget; 34 35 if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 || 36 bit_P.length < 0x30) 37 return 0; 38 39 power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c); 40 if (!power_budget) 41 return 0; 42 43 *ver = nvbios_rd08(bios, power_budget); 44 switch (*ver) { 45 case 0x20: 46 case 0x30: 47 *hdr = nvbios_rd08(bios, power_budget + 0x1); 48 *len = nvbios_rd08(bios, power_budget + 0x2); 49 *cnt = nvbios_rd08(bios, power_budget + 0x3); 50 return power_budget; 51 default: 52 break; 53 } 54 55 return 0; 56 } 57 58 int 59 nvbios_power_budget_header(struct nvkm_bios *bios, 60 struct nvbios_power_budget *budget) 61 { 62 u8 ver, hdr, cnt, len, cap_entry; 63 u32 header; 64 65 if (!bios || !budget) 66 return -EINVAL; 67 68 header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len); 69 if (!header || !cnt) 70 return -ENODEV; 71 72 switch (ver) { 73 case 0x20: 74 cap_entry = nvbios_rd08(bios, header + 0x9); 75 break; 76 case 0x30: 77 cap_entry = nvbios_rd08(bios, header + 0xa); 78 break; 79 default: 80 cap_entry = 0xff; 81 } 82 83 if (cap_entry >= cnt && cap_entry != 0xff) { 84 nvkm_warn(&bios->subdev, 85 "invalid cap_entry in power budget table found\n"); 86 budget->cap_entry = 0xff; 87 return -EINVAL; 88 } 89 90 budget->offset = header; 91 budget->ver = ver; 92 budget->hlen = hdr; 93 budget->elen = len; 94 budget->ecount = cnt; 95 96 budget->cap_entry = cap_entry; 97 98 return 0; 99 } 100 101 int 102 nvbios_power_budget_entry(struct nvkm_bios *bios, 103 struct nvbios_power_budget *budget, 104 u8 idx, struct nvbios_power_budget_entry *entry) 105 { 106 u32 entry_offset; 107 108 if (!bios || !budget || !budget->offset || idx >= budget->ecount 109 || !entry) 110 return -EINVAL; 111 112 entry_offset = budget->offset + budget->hlen + idx * budget->elen; 113 114 if (budget->ver >= 0x20) { 115 entry->min_w = nvbios_rd32(bios, entry_offset + 0x2); 116 entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6); 117 entry->max_w = nvbios_rd32(bios, entry_offset + 0xa); 118 } else { 119 entry->min_w = 0; 120 entry->max_w = nvbios_rd32(bios, entry_offset + 0x2); 121 entry->avg_w = entry->max_w; 122 } 123 124 return 0; 125 } 126