1/*
2 * Copyright 2013 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
23 */
24#include <subdev/bios.h>
25#include <subdev/bios/bit.h>
26#include <subdev/bios/cstep.h>
27
28u32
29nvbios_cstepTe(struct nvkm_bios *bios,
30	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz)
31{
32	struct bit_entry bit_P;
33	u32 cstep = 0;
34
35	if (!bit_entry(bios, 'P', &bit_P)) {
36		if (bit_P.version == 2 && bit_P.length >= 0x38)
37			cstep = nvbios_rd32(bios, bit_P.offset + 0x34);
38
39		if (cstep) {
40			*ver = nvbios_rd08(bios, cstep + 0);
41			switch (*ver) {
42			case 0x10:
43				*hdr = nvbios_rd08(bios, cstep + 1);
44				*cnt = nvbios_rd08(bios, cstep + 3);
45				*len = nvbios_rd08(bios, cstep + 2);
46				*xnr = nvbios_rd08(bios, cstep + 5);
47				*xsz = nvbios_rd08(bios, cstep + 4);
48				return cstep;
49			default:
50				break;
51			}
52		}
53	}
54
55	return 0;
56}
57
58u32
59nvbios_cstepEe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
60{
61	u8  cnt, len, xnr, xsz;
62	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
63	if (data && idx < cnt) {
64		data = data + *hdr + (idx * len);
65		*hdr = len;
66		return data;
67	}
68	return 0;
69}
70
71u32
72nvbios_cstepEp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
73	       struct nvbios_cstepE *info)
74{
75	u32 data = nvbios_cstepEe(bios, idx, ver, hdr);
76	memset(info, 0x00, sizeof(*info));
77	if (data) {
78		info->pstate = (nvbios_rd16(bios, data + 0x00) & 0x01e0) >> 5;
79		info->index   = nvbios_rd08(bios, data + 0x03);
80	}
81	return data;
82}
83
84u32
85nvbios_cstepEm(struct nvkm_bios *bios, u8 pstate, u8 *ver, u8 *hdr,
86	       struct nvbios_cstepE *info)
87{
88	u32 data, idx = 0;
89	while ((data = nvbios_cstepEp(bios, idx++, ver, hdr, info))) {
90		if (info->pstate == pstate)
91			break;
92	}
93	return data;
94}
95
96u32
97nvbios_cstepXe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
98{
99	u8  cnt, len, xnr, xsz;
100	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
101	if (data && idx < xnr) {
102		data = data + *hdr + (cnt * len) + (idx * xsz);
103		*hdr = xsz;
104		return data;
105	}
106	return 0;
107}
108
109u32
110nvbios_cstepXp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
111	       struct nvbios_cstepX *info)
112{
113	u32 data = nvbios_cstepXe(bios, idx, ver, hdr);
114	memset(info, 0x00, sizeof(*info));
115	if (data) {
116		info->freq    = nvbios_rd16(bios, data + 0x00) * 1000;
117		info->unkn[0] = nvbios_rd08(bios, data + 0x02);
118		info->unkn[1] = nvbios_rd08(bios, data + 0x03);
119		info->voltage = nvbios_rd08(bios, data + 0x04);
120	}
121	return data;
122}
123