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

   1 /*
   2  * Copyright 2014 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 <bskeggs@redhat.com>
  23  */
  24 #include <subdev/bios.h>
  25 #include <subdev/bios/image.h>
  26 #include <subdev/bios/pcir.h>
  27 #include <subdev/bios/npde.h>
  28
  29 static bool
  30 nvbios_imagen(struct nvkm_bios *bios, struct nvbios_image *image)
  31 {
  32         struct nvbios_pcirT pcir;
  33         struct nvbios_npdeT npde;
  34         u8  ver;
  35         u16 hdr;
  36         u32 data;
  37
  38         switch ((data = nv_ro16(bios, image->base + 0x00))) {
  39         case 0xaa55:
  40         case 0xbb77:
  41         case 0x4e56: /* NV */
  42                 break;
  43         default:
  44                 nv_debug(bios, "%08x: ROM signature (%04x) unknown\n",
  45                          image->base, data);
  46                 return false;
  47         }
  48
  49         if (!(data = nvbios_pcirTp(bios, image->base, &ver, &hdr, &pcir)))
  50                 return false;
  51         image->size = pcir.image_size;
  52         image->type = pcir.image_type;
  53         image->last = pcir.last;
  54
  55         if (image->type != 0x70) {
  56                 if (!(data = nvbios_npdeTp(bios, image->base, &npde)))
  57                         return true;
  58                 image->size = npde.image_size;
  59                 image->last = npde.last;
  60         } else {
  61                 image->last = true;
  62         }
  63
  64         return true;
  65 }
  66
  67 bool
  68 nvbios_image(struct nvkm_bios *bios, int idx, struct nvbios_image *image)
  69 {
  70         memset(image, 0x00, sizeof(*image));
  71         do {
  72                 image->base += image->size;
  73                 if (image->last || !nvbios_imagen(bios, image))
  74                         return false;
  75         } while(idx--);
  76         return true;
  77 }