drivers/gpu/drm/nouveau/nvkm/subdev/bios/vmap.c

/*
 * Copyright 2012 Nouveau Community
 *
 * 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: Martin Peres
 */
#include <subdev/bios.h>
#include <subdev/bios/bit.h>
#include <subdev/bios/vmap.h>

u16
nvbios_vmap_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
	struct bit_entry bit_P;
	u16 vmap = 0x0000;

	if (!bit_entry(bios, 'P', &bit_P)) {
		if (bit_P.version == 2) {
			vmap = nvbios_rd16(bios, bit_P.offset + 0x20);
			if (vmap) {
				*ver = nvbios_rd08(bios, vmap + 0);
				switch (*ver) {
				case 0x10:
				case 0x20:
					*hdr = nvbios_rd08(bios, vmap + 1);
					*cnt = nvbios_rd08(bios, vmap + 3);
					*len = nvbios_rd08(bios, vmap + 2);
					return vmap;
				default:
					break;
				}
			}
		}
	}

	return 0x0000;
}

u16
nvbios_vmap_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
		  struct nvbios_vmap *info)
{
	u16 vmap = nvbios_vmap_table(bios, ver, hdr, cnt, len);
	memset(info, 0x00, sizeof(*info));
	switch (!!vmap * *ver) {
	case 0x10:
	case 0x20:
		break;
	}
	return vmap;
}

u16
nvbios_vmap_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
{
	u8  hdr, cnt;
	u16 vmap = nvbios_vmap_table(bios, ver, &hdr, &cnt, len);
	if (vmap && idx < cnt) {
		vmap = vmap + hdr + (idx * *len);
		return vmap;
	}
	return 0x0000;
}

u16
nvbios_vmap_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
			struct nvbios_vmap_entry *info)
{
	u16 vmap = nvbios_vmap_entry(bios, idx, ver, len);
	memset(info, 0x00, sizeof(*info));
	switch (!!vmap * *ver) {
	case 0x10:
		info->link   = 0xff;
		info->min    = nvbios_rd32(bios, vmap + 0x00);
		info->max    = nvbios_rd32(bios, vmap + 0x04);
		info->arg[0] = nvbios_rd32(bios, vmap + 0x08);
		info->arg[1] = nvbios_rd32(bios, vmap + 0x0c);
		info->arg[2] = nvbios_rd32(bios, vmap + 0x10);
		break;
	case 0x20:
		info->unk0   = nvbios_rd08(bios, vmap + 0x00);
		info->link   = nvbios_rd08(bios, vmap + 0x01);
		info->min    = nvbios_rd32(bios, vmap + 0x02);
		info->max    = nvbios_rd32(bios, vmap + 0x06);
		info->arg[0] = nvbios_rd32(bios, vmap + 0x0a);
		info->arg[1] = nvbios_rd32(bios, vmap + 0x0e);
		info->arg[2] = nvbios_rd32(bios, vmap + 0x12);
		info->arg[3] = nvbios_rd32(bios, vmap + 0x16);
		info->arg[4] = nvbios_rd32(bios, vmap + 0x1a);
		info->arg[5] = nvbios_rd32(bios, vmap + 0x1e);
		break;
	}
	return vmap;
}