1 /*
2  * Copyright 2014 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 <subdev/bios.h>
25 #include <subdev/bios/image.h>
26 #include <subdev/bios/pcir.h>
27 #include <subdev/bios/npde.h>
28 
29 static bool
30 nvbios_imagen(struct nvkm_bios *bios, struct nvbios_image *image)
31 {
32 	struct nvkm_subdev *subdev = &bios->subdev;
33 	struct nvbios_pcirT pcir;
34 	struct nvbios_npdeT npde;
35 	u8  ver;
36 	u16 hdr;
37 	u32 data;
38 
39 	switch ((data = nvbios_rd16(bios, image->base + 0x00))) {
40 	case 0xaa55:
41 	case 0xbb77:
42 	case 0x4e56: /* NV */
43 		break;
44 	default:
45 		nvkm_debug(subdev, "%08x: ROM signature (%04x) unknown\n",
46 			   image->base, data);
47 		return false;
48 	}
49 
50 	if (!(data = nvbios_pcirTp(bios, image->base, &ver, &hdr, &pcir)))
51 		return false;
52 	image->size = pcir.image_size;
53 	image->type = pcir.image_type;
54 	image->last = pcir.last;
55 
56 	if (image->type != 0x70) {
57 		if (!(data = nvbios_npdeTp(bios, image->base, &npde)))
58 			return true;
59 		image->size = npde.image_size;
60 		image->last = npde.last;
61 	} else {
62 		image->last = true;
63 	}
64 
65 	return true;
66 }
67 
68 bool
69 nvbios_image(struct nvkm_bios *bios, int idx, struct nvbios_image *image)
70 {
71 	u32 imaged_addr = bios->imaged_addr;
72 	memset(image, 0x00, sizeof(*image));
73 	bios->imaged_addr = 0;
74 	do {
75 		image->base += image->size;
76 		if (image->last || !nvbios_imagen(bios, image)) {
77 			bios->imaged_addr = imaged_addr;
78 			return false;
79 		}
80 	} while(idx--);
81 	bios->imaged_addr = imaged_addr;
82 	return true;
83 }
84