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
28void
29g84_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
51static const struct nvkm_pci_func
52g84_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
60int
61g84_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