1 /*
2  * Copyright 2012 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  */
23 #include "priv.h"
24 
25 struct priv {
26 	struct nvkm_bios *bios;
27 	u32 bar0;
28 };
29 
30 static u32
31 pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
32 {
33 	struct nvkm_device *device = bios->subdev.device;
34 	u32 i;
35 	if (offset + length <= 0x00100000) {
36 		for (i = offset; i < offset + length; i += 4)
37 			*(u32 *)&bios->data[i] = nvkm_rd32(device, 0x700000 + i);
38 		return length;
39 	}
40 	return 0;
41 }
42 
43 static void
44 pramin_fini(void *data)
45 {
46 	struct priv *priv = data;
47 	if (priv) {
48 		struct nvkm_device *device = priv->bios->subdev.device;
49 		nvkm_wr32(device, 0x001700, priv->bar0);
50 		kfree(priv);
51 	}
52 }
53 
54 static void *
55 pramin_init(struct nvkm_bios *bios, const char *name)
56 {
57 	struct nvkm_subdev *subdev = &bios->subdev;
58 	struct nvkm_device *device = subdev->device;
59 	struct priv *priv = NULL;
60 	u64 addr = 0;
61 
62 	/* PRAMIN always potentially available prior to nv50 */
63 	if (device->card_type < NV_50)
64 		return NULL;
65 
66 	/* we can't get the bios image pointer without PDISP */
67 	if (device->card_type >= GM100)
68 		addr = nvkm_rd32(device, 0x021c04);
69 	else
70 	if (device->card_type >= NV_C0)
71 		addr = nvkm_rd32(device, 0x022500);
72 	if (addr & 0x00000001) {
73 		nvkm_debug(subdev, "... display disabled\n");
74 		return ERR_PTR(-ENODEV);
75 	}
76 
77 	/* check that the window is enabled and in vram, particularly
78 	 * important as we don't want to be touching vram on an
79 	 * uninitialised board
80 	 */
81 	addr = nvkm_rd32(device, 0x619f04);
82 	if (!(addr & 0x00000008)) {
83 		nvkm_debug(subdev, "... not enabled\n");
84 		return ERR_PTR(-ENODEV);
85 	}
86 	if ( (addr & 0x00000003) != 1) {
87 		nvkm_debug(subdev, "... not in vram\n");
88 		return ERR_PTR(-ENODEV);
89 	}
90 
91 	/* some alternate method inherited from xf86-video-nv... */
92 	addr = (addr & 0xffffff00) << 8;
93 	if (!addr) {
94 		addr  = (u64)nvkm_rd32(device, 0x001700) << 16;
95 		addr += 0xf0000;
96 	}
97 
98 	/* modify bar0 PRAMIN window to cover the bios image */
99 	if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
100 		nvkm_error(subdev, "... out of memory\n");
101 		return ERR_PTR(-ENOMEM);
102 	}
103 
104 	priv->bios = bios;
105 	priv->bar0 = nvkm_rd32(device, 0x001700);
106 	nvkm_wr32(device, 0x001700, addr >> 16);
107 	return priv;
108 }
109 
110 const struct nvbios_source
111 nvbios_ramin = {
112 	.name = "PRAMIN",
113 	.init = pramin_init,
114 	.fini = pramin_fini,
115 	.read = pramin_read,
116 	.rw = true,
117 };
118