drivers/gpu/drm/nouveau/nvkm/subdev/bios/npde.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/npde.h>
  26 #include <subdev/bios/pcir.h>
  27
  28 u32
  29 nvbios_npdeTe(struct nvkm_bios *bios, u32 base)
  30 {
  31         struct nvbios_pcirT pcir;
  32         u8  ver; u16 hdr;
  33         u32 data = nvbios_pcirTp(bios, base, &ver, &hdr, &pcir);
  34         if (data = (data + hdr + 0x0f) & ~0x0f, data) {
  35                 switch (nvbios_rd32(bios, data + 0x00)) {
  36                 case 0x4544504e: /* NPDE */
  37                         break;
  38                 default:
  39                         nvkm_debug(&bios->subdev,
  40                                    "%08x: NPDE signature (%08x) unknown\n",
  41                                    data, nvbios_rd32(bios, data + 0x00));
  42                         data = 0;
  43                         break;
  44                 }
  45         }
  46         return data;
  47 }
  48
  49 u32
  50 nvbios_npdeTp(struct nvkm_bios *bios, u32 base, struct nvbios_npdeT *info)
  51 {
  52         u32 data = nvbios_npdeTe(bios, base);
  53         memset(info, 0x00, sizeof(*info));
  54         if (data) {
  55                 info->image_size = nvbios_rd16(bios, data + 0x08) * 512;
  56                 info->last = nvbios_rd08(bios, data + 0x0a) & 0x80;
  57         }
  58         return data;
  59 }