drivers/gpu/drm/nouveau/nvkm/subdev/pci/nv46.c

   1 /*
   2  * Copyright 2015 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 "priv.h"
  25
  26 #include <core/pci.h>
  27
  28 /* MSI re-arm through the PRI appears to be broken on NV46/NV50/G84/G86/G92,
  29  * so we access it via alternate PCI config space mechanisms.
  30  */
  31 void
  32 nv46_pci_msi_rearm(struct nvkm_pci *pci)
  33 {
  34         struct nvkm_device *device = pci->subdev.device;
  35         struct pci_dev *pdev = device->func->pci(device)->pdev;
  36         pci_write_config_byte(pdev, 0x68, 0xff);
  37 }
  38
  39 static const struct nvkm_pci_func
  40 nv46_pci_func = {
  41         .rd32 = nv40_pci_rd32,
  42         .wr08 = nv40_pci_wr08,
  43         .wr32 = nv40_pci_wr32,
  44         .msi_rearm = nv46_pci_msi_rearm,
  45 };
  46
  47 int
  48 nv46_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
  49 {
  50         return nvkm_pci_new_(&nv46_pci_func, device, index, ppci);
  51 }