1 /* $NetBSD: nouveau_nvkm_subdev_bios_shadowramin.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 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 */
25 #include <sys/cdefs.h>
26 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_shadowramin.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
27
28 #include "priv.h"
29
30 struct priv {
31 struct nvkm_bios *bios;
32 u32 bar0;
33 };
34
35 static u32
pramin_read(void * data,u32 offset,u32 length,struct nvkm_bios * bios)36 pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
37 {
38 struct nvkm_device *device = bios->subdev.device;
39 u32 i;
40 if (offset + length <= 0x00100000) {
41 for (i = offset; i < offset + length; i += 4)
42 *(u32 *)&bios->data[i] = nvkm_rd32(device, 0x700000 + i);
43 return length;
44 }
45 return 0;
46 }
47
48 static void
pramin_fini(void * data)49 pramin_fini(void *data)
50 {
51 struct priv *priv = data;
52 if (priv) {
53 struct nvkm_device *device = priv->bios->subdev.device;
54 nvkm_wr32(device, 0x001700, priv->bar0);
55 kfree(priv);
56 }
57 }
58
59 static void *
pramin_init(struct nvkm_bios * bios,const char * name)60 pramin_init(struct nvkm_bios *bios, const char *name)
61 {
62 struct nvkm_subdev *subdev = &bios->subdev;
63 struct nvkm_device *device = subdev->device;
64 struct priv *priv = NULL;
65 u64 addr = 0;
66
67 /* PRAMIN always potentially available prior to nv50 */
68 if (device->card_type < NV_50)
69 return NULL;
70
71 /* we can't get the bios image pointer without PDISP */
72 if (device->card_type >= GM100)
73 addr = nvkm_rd32(device, 0x021c04);
74 else
75 if (device->card_type >= NV_C0)
76 addr = nvkm_rd32(device, 0x022500);
77 if (addr & 0x00000001) {
78 nvkm_debug(subdev, "... display disabled\n");
79 return ERR_PTR(-ENODEV);
80 }
81
82 /* check that the window is enabled and in vram, particularly
83 * important as we don't want to be touching vram on an
84 * uninitialised board
85 */
86 if (device->card_type >= GV100)
87 addr = nvkm_rd32(device, 0x625f04);
88 else
89 addr = nvkm_rd32(device, 0x619f04);
90 if (!(addr & 0x00000008)) {
91 nvkm_debug(subdev, "... not enabled\n");
92 return ERR_PTR(-ENODEV);
93 }
94 if ( (addr & 0x00000003) != 1) {
95 nvkm_debug(subdev, "... not in vram\n");
96 return ERR_PTR(-ENODEV);
97 }
98
99 /* some alternate method inherited from xf86-video-nv... */
100 addr = (addr & 0xffffff00) << 8;
101 if (!addr) {
102 addr = (u64)nvkm_rd32(device, 0x001700) << 16;
103 addr += 0xf0000;
104 }
105
106 /* modify bar0 PRAMIN window to cover the bios image */
107 if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
108 nvkm_error(subdev, "... out of memory\n");
109 return ERR_PTR(-ENOMEM);
110 }
111
112 priv->bios = bios;
113 priv->bar0 = nvkm_rd32(device, 0x001700);
114 nvkm_wr32(device, 0x001700, addr >> 16);
115 return priv;
116 }
117
118 const struct nvbios_source
119 nvbios_ramin = {
120 .name = "PRAMIN",
121 .init = pramin_init,
122 .fini = pramin_fini,
123 .read = pramin_read,
124 .rw = true,
125 };
126