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)) 36 return 0x0000; 37 38 extdev = nv_ro16(bios, dcb + 18); 39 if (!extdev) 40 return 0x0000; 41 42 *ver = nv_ro08(bios, extdev + 0); 43 *hdr = nv_ro08(bios, extdev + 1); 44 *cnt = nv_ro08(bios, extdev + 2); 45 *len = nv_ro08(bios, extdev + 3); 46 return extdev + *hdr; 47 } 48 49 static u16 50 nvbios_extdev_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len) 51 { 52 u8 hdr, cnt; 53 u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt); 54 if (extdev && idx < cnt) 55 return extdev + idx * *len; 56 return 0x0000; 57 } 58 59 static void 60 extdev_parse_entry(struct nvkm_bios *bios, u16 offset, 61 struct nvbios_extdev_func *entry) 62 { 63 entry->type = nv_ro08(bios, offset + 0); 64 entry->addr = nv_ro08(bios, offset + 1); 65 entry->bus = (nv_ro08(bios, offset + 2) >> 4) & 1; 66 } 67 68 int 69 nvbios_extdev_parse(struct nvkm_bios *bios, int idx, 70 struct nvbios_extdev_func *func) 71 { 72 u8 ver, len; 73 u16 entry; 74 75 if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len))) 76 return -EINVAL; 77 78 extdev_parse_entry(bios, entry, func); 79 return 0; 80 } 81 82 int 83 nvbios_extdev_find(struct nvkm_bios *bios, enum nvbios_extdev_type type, 84 struct nvbios_extdev_func *func) 85 { 86 u8 ver, len, i; 87 u16 entry; 88 89 i = 0; 90 while ((entry = nvbios_extdev_entry(bios, i++, &ver, &len))) { 91 extdev_parse_entry(bios, entry, func); 92 if (func->type == type) 93 return 0; 94 } 95 96 return -EINVAL; 97 } 98