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 u32
nvbios_vmap_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)29 nvbios_vmap_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30 {
31 	struct bit_entry bit_P;
32 	u32 vmap = 0;
33 
34 	if (!bit_entry(bios, 'P', &bit_P)) {
35 		if (bit_P.version == 2) {
36 			vmap = nvbios_rd32(bios, bit_P.offset + 0x20);
37 			if (vmap) {
38 				*ver = nvbios_rd08(bios, vmap + 0);
39 				switch (*ver) {
40 				case 0x10:
41 				case 0x20:
42 					*hdr = nvbios_rd08(bios, vmap + 1);
43 					*cnt = nvbios_rd08(bios, vmap + 3);
44 					*len = nvbios_rd08(bios, vmap + 2);
45 					return vmap;
46 				default:
47 					break;
48 				}
49 			}
50 		}
51 	}
52 
53 	return 0;
54 }
55 
56 u32
nvbios_vmap_parse(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len,struct nvbios_vmap * info)57 nvbios_vmap_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
58 		  struct nvbios_vmap *info)
59 {
60 	u32 vmap = nvbios_vmap_table(bios, ver, hdr, cnt, len);
61 	memset(info, 0x00, sizeof(*info));
62 	switch (!!vmap * *ver) {
63 	case 0x10:
64 		info->max0 = 0xff;
65 		info->max1 = 0xff;
66 		info->max2 = 0xff;
67 		break;
68 	case 0x20:
69 		info->max0 = nvbios_rd08(bios, vmap + 0x7);
70 		info->max1 = nvbios_rd08(bios, vmap + 0x8);
71 		if (*len >= 0xc)
72 			info->max2 = nvbios_rd08(bios, vmap + 0xc);
73 		else
74 			info->max2 = 0xff;
75 		break;
76 	}
77 	return vmap;
78 }
79 
80 u32
nvbios_vmap_entry(struct nvkm_bios * bios,int idx,u8 * ver,u8 * len)81 nvbios_vmap_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
82 {
83 	u8  hdr, cnt;
84 	u32 vmap = nvbios_vmap_table(bios, ver, &hdr, &cnt, len);
85 	if (vmap && idx < cnt) {
86 		vmap = vmap + hdr + (idx * *len);
87 		return vmap;
88 	}
89 	return 0;
90 }
91 
92 u32
nvbios_vmap_entry_parse(struct nvkm_bios * bios,int idx,u8 * ver,u8 * len,struct nvbios_vmap_entry * info)93 nvbios_vmap_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
94 			struct nvbios_vmap_entry *info)
95 {
96 	u32 vmap = nvbios_vmap_entry(bios, idx, ver, len);
97 	memset(info, 0x00, sizeof(*info));
98 	switch (!!vmap * *ver) {
99 	case 0x10:
100 		info->link   = 0xff;
101 		info->min    = nvbios_rd32(bios, vmap + 0x00);
102 		info->max    = nvbios_rd32(bios, vmap + 0x04);
103 		info->arg[0] = nvbios_rd32(bios, vmap + 0x08);
104 		info->arg[1] = nvbios_rd32(bios, vmap + 0x0c);
105 		info->arg[2] = nvbios_rd32(bios, vmap + 0x10);
106 		break;
107 	case 0x20:
108 		info->mode   = nvbios_rd08(bios, vmap + 0x00);
109 		info->link   = nvbios_rd08(bios, vmap + 0x01);
110 		info->min    = nvbios_rd32(bios, vmap + 0x02);
111 		info->max    = nvbios_rd32(bios, vmap + 0x06);
112 		info->arg[0] = nvbios_rd32(bios, vmap + 0x0a);
113 		info->arg[1] = nvbios_rd32(bios, vmap + 0x0e);
114 		info->arg[2] = nvbios_rd32(bios, vmap + 0x12);
115 		info->arg[3] = nvbios_rd32(bios, vmap + 0x16);
116 		info->arg[4] = nvbios_rd32(bios, vmap + 0x1a);
117 		info->arg[5] = nvbios_rd32(bios, vmap + 0x1e);
118 		break;
119 	}
120 	return vmap;
121 }
122