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

   1 /*
   2  * Copyright 2012 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  */
  23 #include "priv.h"
  24
  25 #include <subdev/pci.h>
  26
  27 static u32
  28 prom_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
  29 {
  30         struct nvkm_device *device = data;
  31         u32 i;
  32         if (offset + length <= 0x00100000) {
  33                 for (i = offset; i < offset + length; i += 4)
  34                         *(u32 *)&bios->data[i] = nvkm_rd32(device, 0x300000 + i);
  35                 return length;
  36         }
  37         return 0;
  38 }
  39
  40 static void
  41 prom_fini(void *data)
  42 {
  43         struct nvkm_device *device = data;
  44         nvkm_pci_rom_shadow(device->pci, true);
  45 }
  46
  47 static void *
  48 prom_init(struct nvkm_bios *bios, const char *name)
  49 {
  50         struct nvkm_device *device = bios->subdev.device;
  51         if (device->card_type == NV_40 && device->chipset >= 0x4c)
  52                 return ERR_PTR(-ENODEV);
  53         nvkm_pci_rom_shadow(device->pci, false);
  54         return device;
  55 }
  56
  57 const struct nvbios_source
  58 nvbios_rom = {
  59         .name = "PROM",
  60         .init = prom_init,
  61         .fini = prom_fini,
  62         .read = prom_read,
  63         .rw = false,
  64 };