[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / nouveau / nvkm / subdev / bios / bit.c

/*
 * 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;
}
Commit	Line	Data
70c0f263 BS	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	*/
d390b480 BS	24	#include <subdev/bios.h>
d390b480 BS	25	#include <subdev/bios/bit.h>
70c0f263 BS	26
70c0f263 BS	27	int
d390b480	28	bit_entry(struct nvkm_bios bios, u8 id, struct bit_entry bit)
70c0f263 BS	29	{
70c0f263 BS	30	if (likely(bios->bit_offset)) {
7f5f518f	31	u8 entries = nvbios_rd08(bios, bios->bit_offset + 10);
70c0f263 BS	32	u32 entry = bios->bit_offset + 12;
70c0f263 BS	33	while (entries--) {
7f5f518f BS	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);
70c0f263 BS	39	return 0;
	40	}
	41
7f5f518f	42	entry += nvbios_rd08(bios, bios->bit_offset + 9);
70c0f263 BS	43	}
	44
	45	return -ENOENT;
	46	}
	47
	48	return -EINVAL;
	49	}