LXR linux/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
  27static u32
  28prom_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
  40static void
  41prom_fini(void *data)
  42{
  43        struct nvkm_device *device = data;
  44        nvkm_pci_rom_shadow(device->pci, true);
  45}
  46
  47static void *
  48prom_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
  57const struct nvbios_source
  58nvbios_rom = {
  59        .name = "PROM",
  60        .init = prom_init,
  61        .fini = prom_fini,
  62        .read = prom_read,
  63        .rw = false,
  64};
  65