linux/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv1a.c
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   1/*
   2 * Copyright 2013 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
  23 */
  24#include "ram.h"
  25
  26int
  27nv1a_ram_new(struct nvkm_fb *fb, struct nvkm_ram **pram)
  28{
  29        struct pci_dev *bridge;
  30        u32 mem, mib;
  31
  32        bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 1));
  33        if (!bridge) {
  34                nvkm_error(&fb->subdev, "no bridge device\n");
  35                return -ENODEV;
  36        }
  37
  38        if (fb->subdev.device->chipset == 0x1a) {
  39                pci_read_config_dword(bridge, 0x7c, &mem);
  40                mib = ((mem >> 6) & 31) + 1;
  41        } else {
  42                pci_read_config_dword(bridge, 0x84, &mem);
  43                mib = ((mem >> 4) & 127) + 1;
  44        }
  45
  46        return nvkm_ram_new_(&nv04_ram_func, fb, NVKM_RAM_TYPE_STOLEN,
  47                             mib * 1024 * 1024, 0, pram);
  48}
  49