xref: /netbsd-src/sys/external/bsd/drm2/dist/drm/nouveau/nvkm/subdev/pci/nouveau_nvkm_subdev_pci_g84.c (revision 41ec02673d281bbb3d38e6c78504ce6e30c228c1)
1 /*	$NetBSD: nouveau_nvkm_subdev_pci_g84.c,v 1.3 2021/12/18 23:45:41 riastradh Exp $	*/
2 
3 /*
4  * Copyright 2015 Red Hat Inc.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Ben Skeggs <bskeggs@redhat.com>
25  */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_pci_g84.c,v 1.3 2021/12/18 23:45:41 riastradh Exp $");
28 
29 #include "priv.h"
30 
31 #include <core/pci.h>
32 
33 static int
g84_pcie_version_supported(struct nvkm_pci * pci)34 g84_pcie_version_supported(struct nvkm_pci *pci)
35 {
36 	/* g84 and g86 report wrong information about what they support */
37 	return 1;
38 }
39 
40 int
g84_pcie_version(struct nvkm_pci * pci)41 g84_pcie_version(struct nvkm_pci *pci)
42 {
43 	struct nvkm_device *device = pci->subdev.device;
44 	return (nvkm_rd32(device, 0x00154c) & 0x1) + 1;
45 }
46 
47 void
g84_pcie_set_version(struct nvkm_pci * pci,u8 ver)48 g84_pcie_set_version(struct nvkm_pci *pci, u8 ver)
49 {
50 	struct nvkm_device *device = pci->subdev.device;
51 	nvkm_mask(device, 0x00154c, 0x1, (ver >= 2 ? 0x1 : 0x0));
52 }
53 
54 static void
g84_pcie_set_cap_speed(struct nvkm_pci * pci,bool full_speed)55 g84_pcie_set_cap_speed(struct nvkm_pci *pci, bool full_speed)
56 {
57 	struct nvkm_device *device = pci->subdev.device;
58 	nvkm_mask(device, 0x00154c, 0x80, full_speed ? 0x80 : 0x0);
59 }
60 
61 enum nvkm_pcie_speed
g84_pcie_cur_speed(struct nvkm_pci * pci)62 g84_pcie_cur_speed(struct nvkm_pci *pci)
63 {
64 	u32 reg_v = nvkm_pci_rd32(pci, 0x88) & 0x30000;
65 	switch (reg_v) {
66 	case 0x30000:
67 		return NVKM_PCIE_SPEED_8_0;
68 	case 0x20000:
69 		return NVKM_PCIE_SPEED_5_0;
70 	case 0x10000:
71 	default:
72 		return NVKM_PCIE_SPEED_2_5;
73 	}
74 }
75 
76 enum nvkm_pcie_speed
g84_pcie_max_speed(struct nvkm_pci * pci)77 g84_pcie_max_speed(struct nvkm_pci *pci)
78 {
79 	u32 reg_v = nvkm_pci_rd32(pci, 0x460) & 0x3300;
80 	if (reg_v == 0x2200)
81 		return NVKM_PCIE_SPEED_5_0;
82 	return NVKM_PCIE_SPEED_2_5;
83 }
84 
85 void
g84_pcie_set_link_speed(struct nvkm_pci * pci,enum nvkm_pcie_speed speed)86 g84_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
87 {
88 	u32 mask_value;
89 
90 	if (speed == NVKM_PCIE_SPEED_5_0)
91 		mask_value = 0x20;
92 	else
93 		mask_value = 0x10;
94 
95 	nvkm_pci_mask(pci, 0x460, 0x30, mask_value);
96 	nvkm_pci_mask(pci, 0x460, 0x1, 0x1);
97 }
98 
99 int
g84_pcie_set_link(struct nvkm_pci * pci,enum nvkm_pcie_speed speed,u8 width)100 g84_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
101 {
102 	g84_pcie_set_cap_speed(pci, speed == NVKM_PCIE_SPEED_5_0);
103 	g84_pcie_set_link_speed(pci, speed);
104 	return 0;
105 }
106 
107 void
g84_pci_init(struct nvkm_pci * pci)108 g84_pci_init(struct nvkm_pci *pci)
109 {
110 	/* The following only concerns PCIe cards. */
111 	if (!pci_is_pcie(pci->pdev))
112 		return;
113 
114 	/* Tag field is 8-bit long, regardless of EXT_TAG.
115 	 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
116 	 * field should be used, limiting the number of request to 32.
117 	 *
118 	 * Apparently, 0x041c stores some limit on the number of requests
119 	 * possible, so if EXT_TAG is disabled, limit that requests number to
120 	 * 32
121 	 *
122 	 * Fixes fdo#86537
123 	 */
124 	if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
125 		nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
126 	else
127 		nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
128 }
129 
130 int
g84_pcie_init(struct nvkm_pci * pci)131 g84_pcie_init(struct nvkm_pci *pci)
132 {
133 	bool full_speed = g84_pcie_cur_speed(pci) == NVKM_PCIE_SPEED_5_0;
134 	g84_pcie_set_cap_speed(pci, full_speed);
135 	return 0;
136 }
137 
138 static const struct nvkm_pci_func
139 g84_pci_func = {
140 	.init = g84_pci_init,
141 	.rd32 = nv40_pci_rd32,
142 	.wr08 = nv40_pci_wr08,
143 	.wr32 = nv40_pci_wr32,
144 	.msi_rearm = nv46_pci_msi_rearm,
145 
146 	.pcie.init = g84_pcie_init,
147 	.pcie.set_link = g84_pcie_set_link,
148 
149 	.pcie.max_speed = g84_pcie_max_speed,
150 	.pcie.cur_speed = g84_pcie_cur_speed,
151 
152 	.pcie.set_version = g84_pcie_set_version,
153 	.pcie.version = g84_pcie_version,
154 	.pcie.version_supported = g84_pcie_version_supported,
155 };
156 
157 int
g84_pci_new(struct nvkm_device * device,int index,struct nvkm_pci ** ppci)158 g84_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
159 {
160 	return nvkm_pci_new_(&g84_pci_func, device, index, ppci);
161 }
162