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/vpstate.h> 27 28 static u32 29 nvbios_vpstate_offset(struct nvkm_bios *b) 30 { 31 struct bit_entry bit_P; 32 33 if (!bit_entry(b, 'P', &bit_P)) { 34 if (bit_P.version == 2 && bit_P.length >= 0x3c) 35 return nvbios_rd32(b, bit_P.offset + 0x38); 36 } 37 38 return 0x0000; 39 } 40 41 int 42 nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h) 43 { 44 if (!h) 45 return -EINVAL; 46 47 h->offset = nvbios_vpstate_offset(b); 48 if (!h->offset) 49 return -ENODEV; 50 51 h->version = nvbios_rd08(b, h->offset); 52 switch (h->version) { 53 case 0x10: 54 h->hlen = nvbios_rd08(b, h->offset + 0x1); 55 h->elen = nvbios_rd08(b, h->offset + 0x2); 56 h->slen = nvbios_rd08(b, h->offset + 0x3); 57 h->scount = nvbios_rd08(b, h->offset + 0x4); 58 h->ecount = nvbios_rd08(b, h->offset + 0x5); 59 60 h->base_id = nvbios_rd08(b, h->offset + 0x0f); 61 h->boost_id = nvbios_rd08(b, h->offset + 0x10); 62 h->tdp_id = nvbios_rd08(b, h->offset + 0x11); 63 return 0; 64 default: 65 return -EINVAL; 66 } 67 } 68 69 int 70 nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h, 71 u8 idx, struct nvbios_vpstate_entry *e) 72 { 73 u32 offset; 74 75 if (!e || !h || idx > h->ecount) 76 return -EINVAL; 77 78 offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount)); 79 e->pstate = nvbios_rd08(b, offset); 80 e->clock_mhz = nvbios_rd16(b, offset + 0x5); 81 return 0; 82 } 83