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 void
g84_pci_init(struct nvkm_pci * pci)29 g84_pci_init(struct nvkm_pci *pci)
30 {
31 /* The following only concerns PCIe cards. */
32 if (!pci_is_pcie(pci->pdev))
33 return;
34
35 /* Tag field is 8-bit long, regardless of EXT_TAG.
36 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
37 * field should be used, limiting the number of request to 32.
38 *
39 * Apparently, 0x041c stores some limit on the number of requests
40 * possible, so if EXT_TAG is disabled, limit that requests number to
41 * 32
42 *
43 * Fixes fdo#86537
44 */
45 if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
46 nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
47 else
48 nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
49 }
50
51 static const struct nvkm_pci_func
52 g84_pci_func = {
53 .init = g84_pci_init,
54 .rd32 = nv40_pci_rd32,
55 .wr08 = nv40_pci_wr08,
56 .wr32 = nv40_pci_wr32,
57 .msi_rearm = nv46_pci_msi_rearm,
58 };
59
60 int
g84_pci_new(struct nvkm_device * device,int index,struct nvkm_pci ** ppci)61 g84_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
62 {
63 return nvkm_pci_new_(&g84_pci_func, device, index, ppci);
64 }
65