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/extdev.h> 27 #include <subdev/bios/iccsense.h> 28 29 static u32 30 nvbios_iccsense_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, 31 u8 *len) 32 { 33 struct bit_entry bit_P; 34 u32 iccsense; 35 36 if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 || 37 bit_P.length < 0x2c) 38 return 0; 39 40 iccsense = nvbios_rd32(bios, bit_P.offset + 0x28); 41 if (!iccsense) 42 return 0; 43 44 *ver = nvbios_rd08(bios, iccsense + 0); 45 switch (*ver) { 46 case 0x10: 47 case 0x20: 48 *hdr = nvbios_rd08(bios, iccsense + 1); 49 *len = nvbios_rd08(bios, iccsense + 2); 50 *cnt = nvbios_rd08(bios, iccsense + 3); 51 return iccsense; 52 default: 53 break; 54 } 55 56 return 0; 57 } 58 59 int 60 nvbios_iccsense_parse(struct nvkm_bios *bios, struct nvbios_iccsense *iccsense) 61 { 62 struct nvkm_subdev *subdev = &bios->subdev; 63 u8 ver, hdr, cnt, len, i; 64 u32 table, entry; 65 66 table = nvbios_iccsense_table(bios, &ver, &hdr, &cnt, &len); 67 if (!table || !cnt) 68 return -EINVAL; 69 70 if (ver != 0x10 && ver != 0x20) { 71 nvkm_error(subdev, "ICCSENSE version 0x%02x unknown\n", ver); 72 return -EINVAL; 73 } 74 75 iccsense->nr_entry = cnt; 76 iccsense->rail = kmalloc(sizeof(struct pwr_rail_t) * cnt, GFP_KERNEL); 77 if (!iccsense->rail) 78 return -ENOMEM; 79 80 for (i = 0; i < cnt; ++i) { 81 struct nvbios_extdev_func extdev; 82 struct pwr_rail_t *rail = &iccsense->rail[i]; 83 u8 res_start = 0; 84 int r; 85 86 entry = table + hdr + i * len; 87 88 switch(ver) { 89 case 0x10: 90 rail->mode = nvbios_rd08(bios, entry + 0x1); 91 rail->extdev_id = nvbios_rd08(bios, entry + 0x2); 92 res_start = 0x3; 93 break; 94 case 0x20: 95 rail->mode = nvbios_rd08(bios, entry); 96 rail->extdev_id = nvbios_rd08(bios, entry + 0x1); 97 res_start = 0x5; 98 break; 99 }; 100 101 if (nvbios_extdev_parse(bios, rail->extdev_id, &extdev)) 102 continue; 103 104 switch (extdev.type) { 105 case NVBIOS_EXTDEV_INA209: 106 case NVBIOS_EXTDEV_INA219: 107 rail->resistor_count = 1; 108 break; 109 case NVBIOS_EXTDEV_INA3221: 110 rail->resistor_count = 3; 111 break; 112 default: 113 rail->resistor_count = 0; 114 break; 115 }; 116 117 for (r = 0; r < rail->resistor_count; ++r) { 118 rail->resistors[r].mohm = nvbios_rd08(bios, entry + res_start + r * 2); 119 rail->resistors[r].enabled = !(nvbios_rd08(bios, entry + res_start + r * 2 + 1) & 0x40); 120 } 121 rail->config = nvbios_rd16(bios, entry + res_start + rail->resistor_count * 2); 122 } 123 124 return 0; 125 } 126