drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv1a.c

   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
  26 int
  27 nv1a_ram_new(struct nvkm_fb *fb, struct nvkm_ram **pram)
  28 {
  29         struct pci_dev *bridge;
  30         u32 mem, mib;
  31         int domain = 0;
  32         struct pci_dev *pdev = NULL;
  33
  34         if (dev_is_pci(fb->subdev.device->dev))
  35                 pdev = to_pci_dev(fb->subdev.device->dev);
  36
  37         if (pdev)
  38                 domain = pci_domain_nr(pdev->bus);
  39
  40         bridge = pci_get_domain_bus_and_slot(domain, 0, PCI_DEVFN(0, 1));
  41         if (!bridge) {
  42                 nvkm_error(&fb->subdev, "no bridge device\n");
  43                 return -ENODEV;
  44         }
  45
  46         if (fb->subdev.device->chipset == 0x1a) {
  47                 pci_read_config_dword(bridge, 0x7c, &mem);
  48                 mib = ((mem >> 6) & 31) + 1;
  49         } else {
  50                 pci_read_config_dword(bridge, 0x84, &mem);
  51                 mib = ((mem >> 4) & 127) + 1;
  52         }
  53
  54         return nvkm_ram_new_(&nv04_ram_func, fb, NVKM_RAM_TYPE_STOLEN,
  55                              mib * 1024 * 1024, pram);
  56 }