1/* $NetBSD: nouveau_nvkm_subdev_bios_bit.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */ 2 3/* 4 * Copyright 2012 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs 25 */ 26#include <sys/cdefs.h> 27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_bit.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $"); 28 29#include <subdev/bios.h> 30#include <subdev/bios/bit.h> 31 32int 33bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit) 34{ 35 if (likely(bios->bit_offset)) { 36 u8 entries = nvbios_rd08(bios, bios->bit_offset + 10); 37 u32 entry = bios->bit_offset + 12; 38 while (entries--) { 39 if (nvbios_rd08(bios, entry + 0) == id) { 40 bit->id = nvbios_rd08(bios, entry + 0); 41 bit->version = nvbios_rd08(bios, entry + 1); 42 bit->length = nvbios_rd16(bios, entry + 2); 43 bit->offset = nvbios_rd16(bios, entry + 4); 44 return 0; 45 } 46 47 entry += nvbios_rd08(bios, bios->bit_offset + 9); 48 } 49 50 return -ENOENT; 51 } 52 53 return -EINVAL; 54} 55