1 /* 2 * Copyright 2012 Nouveau Community 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/dcb.h> 26 #include <subdev/bios/extdev.h> 27 28 static u16 29 extdev_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt) 30 { 31 u8 dcb_ver, dcb_hdr, dcb_cnt, dcb_len; 32 u16 dcb, extdev = 0; 33 34 dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len); 35 if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40 && dcb_ver != 0x41)) 36 return 0x0000; 37 38 extdev = nvbios_rd16(bios, dcb + 18); 39 if (!extdev) 40 return 0x0000; 41 42 *ver = nvbios_rd08(bios, extdev + 0); 43 *hdr = nvbios_rd08(bios, extdev + 1); 44 *cnt = nvbios_rd08(bios, extdev + 2); 45 *len = nvbios_rd08(bios, extdev + 3); 46 return extdev + *hdr; 47 } 48 49 bool 50 nvbios_extdev_skip_probe(struct nvkm_bios *bios) 51 { 52 u8 ver, hdr, len, cnt; 53 u16 data = extdev_table(bios, &ver, &hdr, &len, &cnt); 54 if (data && ver == 0x40 && hdr >= 5) { 55 u8 flags = nvbios_rd08(bios, data - hdr + 4); 56 if (flags & 1) 57 return true; 58 } 59 return false; 60 } 61 62 static u16 63 nvbios_extdev_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len) 64 { 65 u8 hdr, cnt; 66 u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt); 67 if (extdev && idx < cnt) 68 return extdev + idx * *len; 69 return 0x0000; 70 } 71 72 static void 73 extdev_parse_entry(struct nvkm_bios *bios, u16 offset, 74 struct nvbios_extdev_func *entry) 75 { 76 entry->type = nvbios_rd08(bios, offset + 0); 77 entry->addr = nvbios_rd08(bios, offset + 1); 78 entry->bus = (nvbios_rd08(bios, offset + 2) >> 4) & 1; 79 } 80 81 int 82 nvbios_extdev_parse(struct nvkm_bios *bios, int idx, 83 struct nvbios_extdev_func *func) 84 { 85 u8 ver, len; 86 u16 entry; 87 88 if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len))) 89 return -EINVAL; 90 91 extdev_parse_entry(bios, entry, func); 92 return 0; 93 } 94 95 int 96 nvbios_extdev_find(struct nvkm_bios *bios, enum nvbios_extdev_type type, 97 struct nvbios_extdev_func *func) 98 { 99 u8 ver, len, i; 100 u16 entry; 101 102 i = 0; 103 while ((entry = nvbios_extdev_entry(bios, i++, &ver, &len))) { 104 extdev_parse_entry(bios, entry, func); 105 if (func->type == type) 106 return 0; 107 } 108 109 return -EINVAL; 110 } 111