1 /*
2  * Copyright 2012 Nouveau Community
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: Martin Peres
23  */
24 #include <subdev/bios.h>
25 #include <subdev/bios/bit.h>
26 #include <subdev/bios/vmap.h>
27 
28 u16
29 nvbios_vmap_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30 {
31 	struct bit_entry bit_P;
32 	u16 vmap = 0x0000;
33 
34 	if (!bit_entry(bios, 'P', &bit_P)) {
35 		if (bit_P.version == 2) {
36 			vmap = nv_ro16(bios, bit_P.offset + 0x20);
37 			if (vmap) {
38 				*ver = nv_ro08(bios, vmap + 0);
39 				switch (*ver) {
40 				case 0x10:
41 				case 0x20:
42 					*hdr = nv_ro08(bios, vmap + 1);
43 					*cnt = nv_ro08(bios, vmap + 3);
44 					*len = nv_ro08(bios, vmap + 2);
45 					return vmap;
46 				default:
47 					break;
48 				}
49 			}
50 		}
51 	}
52 
53 	return 0x0000;
54 }
55 
56 u16
57 nvbios_vmap_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
58 		  struct nvbios_vmap *info)
59 {
60 	u16 vmap = nvbios_vmap_table(bios, ver, hdr, cnt, len);
61 	memset(info, 0x00, sizeof(*info));
62 	switch (!!vmap * *ver) {
63 	case 0x10:
64 	case 0x20:
65 		break;
66 	}
67 	return vmap;
68 }
69 
70 u16
71 nvbios_vmap_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
72 {
73 	u8  hdr, cnt;
74 	u16 vmap = nvbios_vmap_table(bios, ver, &hdr, &cnt, len);
75 	if (vmap && idx < cnt) {
76 		vmap = vmap + hdr + (idx * *len);
77 		return vmap;
78 	}
79 	return 0x0000;
80 }
81 
82 u16
83 nvbios_vmap_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
84 			struct nvbios_vmap_entry *info)
85 {
86 	u16 vmap = nvbios_vmap_entry(bios, idx, ver, len);
87 	memset(info, 0x00, sizeof(*info));
88 	switch (!!vmap * *ver) {
89 	case 0x10:
90 		info->link   = 0xff;
91 		info->min    = nv_ro32(bios, vmap + 0x00);
92 		info->max    = nv_ro32(bios, vmap + 0x04);
93 		info->arg[0] = nv_ro32(bios, vmap + 0x08);
94 		info->arg[1] = nv_ro32(bios, vmap + 0x0c);
95 		info->arg[2] = nv_ro32(bios, vmap + 0x10);
96 		break;
97 	case 0x20:
98 		info->unk0   = nv_ro08(bios, vmap + 0x00);
99 		info->link   = nv_ro08(bios, vmap + 0x01);
100 		info->min    = nv_ro32(bios, vmap + 0x02);
101 		info->max    = nv_ro32(bios, vmap + 0x06);
102 		info->arg[0] = nv_ro32(bios, vmap + 0x0a);
103 		info->arg[1] = nv_ro32(bios, vmap + 0x0e);
104 		info->arg[2] = nv_ro32(bios, vmap + 0x12);
105 		info->arg[3] = nv_ro32(bios, vmap + 0x16);
106 		info->arg[4] = nv_ro32(bios, vmap + 0x1a);
107 		info->arg[5] = nv_ro32(bios, vmap + 0x1e);
108 		break;
109 	}
110 	return vmap;
111 }
112