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 nvkm_subdev *subdev = &bios->subdev;
  33         struct nvbios_pcirT pcir;
  34         struct nvbios_npdeT npde;
  35         u8  ver;
  36         u16 hdr;
  37         u32 data;
  38
  39         switch ((data = nvbios_rd16(bios, image->base + 0x00))) {
  40         case 0xaa55:
  41         case 0xbb77:
  42         case 0x4e56: /* NV */
  43                 break;
  44         default:
  45                 nvkm_debug(subdev, "%08x: ROM signature (%04x) unknown\n",
  46                            image->base, data);
  47                 return false;
  48         }
  49
  50         if (!(data = nvbios_pcirTp(bios, image->base, &ver, &hdr, &pcir)))
  51                 return false;
  52         image->size = pcir.image_size;
  53         image->type = pcir.image_type;
  54         image->last = pcir.last;
  55
  56         if (image->type != 0x70) {
  57                 if (!(data = nvbios_npdeTp(bios, image->base, &npde)))
  58                         return true;
  59                 image->size = npde.image_size;
  60                 image->last = npde.last;
  61         } else {
  62                 image->last = true;
  63         }
  64
  65         return true;
  66 }
  67
  68 bool
  69 nvbios_image(struct nvkm_bios *bios, int idx, struct nvbios_image *image)
  70 {
  71         u32 imaged_addr = bios->imaged_addr;
  72         memset(image, 0x00, sizeof(*image));
  73         bios->imaged_addr = 0;
  74         do {
  75                 image->base += image->size;
  76                 if (image->last || !nvbios_imagen(bios, image)) {
  77                         bios->imaged_addr = imaged_addr;
  78                         return false;
  79                 }
  80         } while(idx--);
  81         bios->imaged_addr = imaged_addr;
  82         return true;
  83 }