1 /* 2 * Copyright 2015 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/iccsense.h> 27 28 static u16 29 nvbios_iccsense_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, 30 u8 *len) 31 { 32 struct bit_entry bit_P; 33 u16 iccsense; 34 35 if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 || 36 bit_P.length < 0x2c) 37 return 0; 38 39 iccsense = nvbios_rd16(bios, bit_P.offset + 0x28); 40 if (!iccsense) 41 return 0; 42 43 *ver = nvbios_rd08(bios, iccsense + 0); 44 switch (*ver) { 45 case 0x10: 46 case 0x20: 47 *hdr = nvbios_rd08(bios, iccsense + 1); 48 *len = nvbios_rd08(bios, iccsense + 2); 49 *cnt = nvbios_rd08(bios, iccsense + 3); 50 return iccsense; 51 default: 52 break; 53 } 54 55 return 0; 56 } 57 58 int 59 nvbios_iccsense_parse(struct nvkm_bios *bios, struct nvbios_iccsense *iccsense) 60 { 61 struct nvkm_subdev *subdev = &bios->subdev; 62 u8 ver, hdr, cnt, len, i; 63 u16 table, entry; 64 65 table = nvbios_iccsense_table(bios, &ver, &hdr, &cnt, &len); 66 if (!table || !cnt) 67 return -EINVAL; 68 69 if (ver != 0x10 && ver != 0x20) { 70 nvkm_error(subdev, "ICCSENSE version 0x%02x unknown\n", ver); 71 return -EINVAL; 72 } 73 74 iccsense->nr_entry = cnt; 75 iccsense->rail = kmalloc(sizeof(struct pwr_rail_t) * cnt, GFP_KERNEL); 76 if (!iccsense->rail) 77 return -ENOMEM; 78 79 for (i = 0; i < cnt; ++i) { 80 struct pwr_rail_t *rail = &iccsense->rail[i]; 81 entry = table + hdr + i * len; 82 83 switch(ver) { 84 case 0x10: 85 rail->mode = nvbios_rd08(bios, entry + 0x1); 86 rail->extdev_id = nvbios_rd08(bios, entry + 0x2); 87 rail->resistor_mohm = nvbios_rd08(bios, entry + 0x3); 88 rail->rail = nvbios_rd08(bios, entry + 0x4); 89 break; 90 case 0x20: 91 rail->mode = nvbios_rd08(bios, entry); 92 rail->extdev_id = nvbios_rd08(bios, entry + 0x1); 93 rail->resistor_mohm = nvbios_rd08(bios, entry + 0x5); 94 rail->rail = nvbios_rd08(bios, entry + 0x6); 95 break; 96 }; 97 } 98 99 return 0; 100 } 101