text: /*
   * 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>
  
  u32
  nvbios_vmap_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  {
  	struct bit_entry bit_P;
  	u32 vmap = 0;
  
  	if (!bit_entry(bios, 'P', &bit_P)) {
  		if (bit_P.version == 2) {
  			vmap = nvbios_rd32(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 0;
  }
  
  u32
  nvbios_vmap_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
  		  struct nvbios_vmap *info)
  {
  	u32 vmap = nvbios_vmap_table(bios, ver, hdr, cnt, len);
  	memset(info, 0x00, sizeof(*info));
  	switch (!!vmap * *ver) {
  	case 0x10:
  		info->max0 = 0xff;
  		info->max1 = 0xff;
  		info->max2 = 0xff;
  		break;
  	case 0x20:
  		info->max0 = nvbios_rd08(bios, vmap + 0x7);
  		info->max1 = nvbios_rd08(bios, vmap + 0x8);
  		if (*len >= 0xc)
  			info->max2 = nvbios_rd08(bios, vmap + 0xc);
  		else
  			info->max2 = 0xff;
  		break;
  	}
  	return vmap;
  }
  
  u32
  nvbios_vmap_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
  {
  	u8  hdr, cnt;
  	u32 vmap = nvbios_vmap_table(bios, ver, &hdr, &cnt, len);
  	if (vmap && idx < cnt) {
  		vmap = vmap + hdr + (idx * *len);
  		return vmap;
  	}
  	return 0;
  }
  
  u32
  nvbios_vmap_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
  			struct nvbios_vmap_entry *info)
  {
  	u32 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->mode   = 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;
  }
  