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
28u16
29nvbios_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 = nvbios_rd16(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 0x0000;
54}
55
56u16
57nvbios_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
70u16
71nvbios_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
82u16
83nvbios_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    = nvbios_rd32(bios, vmap + 0x00);
92		info->max    = nvbios_rd32(bios, vmap + 0x04);
93		info->arg[0] = nvbios_rd32(bios, vmap + 0x08);
94		info->arg[1] = nvbios_rd32(bios, vmap + 0x0c);
95		info->arg[2] = nvbios_rd32(bios, vmap + 0x10);
96		break;
97	case 0x20:
98		info->unk0   = nvbios_rd08(bios, vmap + 0x00);
99		info->link   = nvbios_rd08(bios, vmap + 0x01);
100		info->min    = nvbios_rd32(bios, vmap + 0x02);
101		info->max    = nvbios_rd32(bios, vmap + 0x06);
102		info->arg[0] = nvbios_rd32(bios, vmap + 0x0a);
103		info->arg[1] = nvbios_rd32(bios, vmap + 0x0e);
104		info->arg[2] = nvbios_rd32(bios, vmap + 0x12);
105		info->arg[3] = nvbios_rd32(bios, vmap + 0x16);
106		info->arg[4] = nvbios_rd32(bios, vmap + 0x1a);
107		info->arg[5] = nvbios_rd32(bios, vmap + 0x1e);
108		break;
109	}
110	return vmap;
111}
112