LXR linux/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
  28u32
  29nvbios_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
  49u32
  50nvbios_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}
  60