diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c new file mode 100644 index 000000000..070ff33f8 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c @@ -0,0 +1,49 @@ +/* + * Copyright 2012 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Ben Skeggs + */ +#include <subdev/bios.h> +#include <subdev/bios/bit.h> + +int +bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit) +{ + if (likely(bios->bit_offset)) { + u8 entries = nvbios_rd08(bios, bios->bit_offset + 10); + u32 entry = bios->bit_offset + 12; + while (entries--) { + if (nvbios_rd08(bios, entry + 0) == id) { + bit->id = nvbios_rd08(bios, entry + 0); + bit->version = nvbios_rd08(bios, entry + 1); + bit->length = nvbios_rd16(bios, entry + 2); + bit->offset = nvbios_rd16(bios, entry + 4); + return 0; + } + + entry += nvbios_rd08(bios, bios->bit_offset + 9); + } + + return -ENOENT; + } + + return -EINVAL; +} |