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 static int
29 g84_pcie_version_supported(struct nvkm_pci *pci)
30 {
31 	/* g84 and g86 report wrong information about what they support */
32 	return 1;
33 }
34 
35 int
36 g84_pcie_version(struct nvkm_pci *pci)
37 {
38 	struct nvkm_device *device = pci->subdev.device;
39 	return (nvkm_rd32(device, 0x00154c) & 0x1) + 1;
40 }
41 
42 void
43 g84_pcie_set_version(struct nvkm_pci *pci, u8 ver)
44 {
45 	struct nvkm_device *device = pci->subdev.device;
46 	nvkm_mask(device, 0x00154c, 0x1, (ver >= 2 ? 0x1 : 0x0));
47 }
48 
49 static void
50 g84_pcie_set_cap_speed(struct nvkm_pci *pci, bool full_speed)
51 {
52 	struct nvkm_device *device = pci->subdev.device;
53 	nvkm_mask(device, 0x00154c, 0x80, full_speed ? 0x80 : 0x0);
54 }
55 
56 enum nvkm_pcie_speed
57 g84_pcie_cur_speed(struct nvkm_pci *pci)
58 {
59 	u32 reg_v = nvkm_pci_rd32(pci, 0x88) & 0x30000;
60 	switch (reg_v) {
61 	case 0x30000:
62 		return NVKM_PCIE_SPEED_8_0;
63 	case 0x20000:
64 		return NVKM_PCIE_SPEED_5_0;
65 	case 0x10000:
66 	default:
67 		return NVKM_PCIE_SPEED_2_5;
68 	}
69 }
70 
71 enum nvkm_pcie_speed
72 g84_pcie_max_speed(struct nvkm_pci *pci)
73 {
74 	u32 reg_v = nvkm_pci_rd32(pci, 0x460) & 0x3300;
75 	if (reg_v == 0x2200)
76 		return NVKM_PCIE_SPEED_5_0;
77 	return NVKM_PCIE_SPEED_2_5;
78 }
79 
80 void
81 g84_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
82 {
83 	u32 mask_value;
84 
85 	if (speed == NVKM_PCIE_SPEED_5_0)
86 		mask_value = 0x20;
87 	else
88 		mask_value = 0x10;
89 
90 	nvkm_pci_mask(pci, 0x460, 0x30, mask_value);
91 	nvkm_pci_mask(pci, 0x460, 0x1, 0x1);
92 }
93 
94 int
95 g84_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
96 {
97 	g84_pcie_set_cap_speed(pci, speed == NVKM_PCIE_SPEED_5_0);
98 	g84_pcie_set_link_speed(pci, speed);
99 	return 0;
100 }
101 
102 void
103 g84_pci_init(struct nvkm_pci *pci)
104 {
105 	/* The following only concerns PCIe cards. */
106 	if (!pci_is_pcie(pci->pdev))
107 		return;
108 
109 	/* Tag field is 8-bit long, regardless of EXT_TAG.
110 	 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
111 	 * field should be used, limiting the number of request to 32.
112 	 *
113 	 * Apparently, 0x041c stores some limit on the number of requests
114 	 * possible, so if EXT_TAG is disabled, limit that requests number to
115 	 * 32
116 	 *
117 	 * Fixes fdo#86537
118 	 */
119 	if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
120 		nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
121 	else
122 		nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
123 }
124 
125 int
126 g84_pcie_init(struct nvkm_pci *pci)
127 {
128 	bool full_speed = g84_pcie_cur_speed(pci) == NVKM_PCIE_SPEED_5_0;
129 	g84_pcie_set_cap_speed(pci, full_speed);
130 	return 0;
131 }
132 
133 static const struct nvkm_pci_func
134 g84_pci_func = {
135 	.init = g84_pci_init,
136 	.rd32 = nv40_pci_rd32,
137 	.wr08 = nv40_pci_wr08,
138 	.wr32 = nv40_pci_wr32,
139 	.msi_rearm = nv46_pci_msi_rearm,
140 
141 	.pcie.init = g84_pcie_init,
142 	.pcie.set_link = g84_pcie_set_link,
143 
144 	.pcie.max_speed = g84_pcie_max_speed,
145 	.pcie.cur_speed = g84_pcie_cur_speed,
146 
147 	.pcie.set_version = g84_pcie_set_version,
148 	.pcie.version = g84_pcie_version,
149 	.pcie.version_supported = g84_pcie_version_supported,
150 };
151 
152 int
153 g84_pci_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
154 	    struct nvkm_pci **ppci)
155 {
156 	return nvkm_pci_new_(&g84_pci_func, device, type, inst, ppci);
157 }
158