1 /* 2 * Copyright 2012 Red Hat Inc. 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: Ben Skeggs 23 */ 24 #include <subdev/bios.h> 25 #include <subdev/bios/bit.h> 26 27 int 28 bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit) 29 { 30 if (likely(bios->bit_offset)) { 31 u8 entries = nvbios_rd08(bios, bios->bit_offset + 10); 32 u32 entry = bios->bit_offset + 12; 33 while (entries--) { 34 if (nvbios_rd08(bios, entry + 0) == id) { 35 bit->id = nvbios_rd08(bios, entry + 0); 36 bit->version = nvbios_rd08(bios, entry + 1); 37 bit->length = nvbios_rd16(bios, entry + 2); 38 bit->offset = nvbios_rd16(bios, entry + 4); 39 return 0; 40 } 41 42 entry += nvbios_rd08(bios, bios->bit_offset + 9); 43 } 44 45 return -ENOENT; 46 } 47 48 return -EINVAL; 49 } 50