1/*
2 * Copyright 2012 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/dp.h>
27
28static u16
29nvbios_dp_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30{
31	struct bit_entry d;
32
33	if (!bit_entry(bios, 'd', &d)) {
34		if (d.version == 1 && d.length >= 2) {
35			u16 data = nvbios_rd16(bios, d.offset);
36			if (data) {
37				*ver = nvbios_rd08(bios, data + 0x00);
38				switch (*ver) {
39				case 0x21:
40				case 0x30:
41				case 0x40:
42				case 0x41:
43					*hdr = nvbios_rd08(bios, data + 0x01);
44					*len = nvbios_rd08(bios, data + 0x02);
45					*cnt = nvbios_rd08(bios, data + 0x03);
46					return data;
47				default:
48					break;
49				}
50			}
51		}
52	}
53
54	return 0x0000;
55}
56
57static u16
58nvbios_dpout_entry(struct nvkm_bios *bios, u8 idx,
59		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
60{
61	u16 data = nvbios_dp_table(bios, ver, hdr, cnt, len);
62	if (data && idx < *cnt) {
63		u16 outp = nvbios_rd16(bios, data + *hdr + idx * *len);
64		switch (*ver * !!outp) {
65		case 0x21:
66		case 0x30:
67			*hdr = nvbios_rd08(bios, data + 0x04);
68			*len = nvbios_rd08(bios, data + 0x05);
69			*cnt = nvbios_rd08(bios, outp + 0x04);
70			break;
71		case 0x40:
72		case 0x41:
73			*hdr = nvbios_rd08(bios, data + 0x04);
74			*cnt = 0;
75			*len = 0;
76			break;
77		default:
78			break;
79		}
80		return outp;
81	}
82	*ver = 0x00;
83	return 0x0000;
84}
85
86u16
87nvbios_dpout_parse(struct nvkm_bios *bios, u8 idx,
88		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
89		   struct nvbios_dpout *info)
90{
91	u16 data = nvbios_dpout_entry(bios, idx, ver, hdr, cnt, len);
92	memset(info, 0x00, sizeof(*info));
93	if (data && *ver) {
94		info->type = nvbios_rd16(bios, data + 0x00);
95		info->mask = nvbios_rd16(bios, data + 0x02);
96		switch (*ver) {
97		case 0x21:
98		case 0x30:
99			info->flags     = nvbios_rd08(bios, data + 0x05);
100			info->script[0] = nvbios_rd16(bios, data + 0x06);
101			info->script[1] = nvbios_rd16(bios, data + 0x08);
102			info->lnkcmp    = nvbios_rd16(bios, data + 0x0a);
103			if (*len >= 0x0f) {
104				info->script[2] = nvbios_rd16(bios, data + 0x0c);
105				info->script[3] = nvbios_rd16(bios, data + 0x0e);
106			}
107			if (*len >= 0x11)
108				info->script[4] = nvbios_rd16(bios, data + 0x10);
109			break;
110		case 0x40:
111		case 0x41:
112			info->flags     = nvbios_rd08(bios, data + 0x04);
113			info->script[0] = nvbios_rd16(bios, data + 0x05);
114			info->script[1] = nvbios_rd16(bios, data + 0x07);
115			info->lnkcmp    = nvbios_rd16(bios, data + 0x09);
116			info->script[2] = nvbios_rd16(bios, data + 0x0b);
117			info->script[3] = nvbios_rd16(bios, data + 0x0d);
118			info->script[4] = nvbios_rd16(bios, data + 0x0f);
119			break;
120		default:
121			data = 0x0000;
122			break;
123		}
124	}
125	return data;
126}
127
128u16
129nvbios_dpout_match(struct nvkm_bios *bios, u16 type, u16 mask,
130		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
131		   struct nvbios_dpout *info)
132{
133	u16 data, idx = 0;
134	while ((data = nvbios_dpout_parse(bios, idx++, ver, hdr, cnt, len, info)) || *ver) {
135		if (data && info->type == type) {
136			if ((info->mask & mask) == mask)
137				break;
138		}
139	}
140	return data;
141}
142
143static u16
144nvbios_dpcfg_entry(struct nvkm_bios *bios, u16 outp, u8 idx,
145		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
146{
147	if (*ver >= 0x40) {
148		outp = nvbios_dp_table(bios, ver, hdr, cnt, len);
149		*hdr = *hdr + (*len * * cnt);
150		*len = nvbios_rd08(bios, outp + 0x06);
151		*cnt = nvbios_rd08(bios, outp + 0x07) *
152		       nvbios_rd08(bios, outp + 0x05);
153	}
154
155	if (idx < *cnt)
156		return outp + *hdr + (idx * *len);
157
158	return 0x0000;
159}
160
161u16
162nvbios_dpcfg_parse(struct nvkm_bios *bios, u16 outp, u8 idx,
163		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
164		   struct nvbios_dpcfg *info)
165{
166	u16 data = nvbios_dpcfg_entry(bios, outp, idx, ver, hdr, cnt, len);
167	memset(info, 0x00, sizeof(*info));
168	if (data) {
169		switch (*ver) {
170		case 0x21:
171			info->dc    = nvbios_rd08(bios, data + 0x02);
172			info->pe    = nvbios_rd08(bios, data + 0x03);
173			info->tx_pu = nvbios_rd08(bios, data + 0x04);
174			break;
175		case 0x30:
176		case 0x40:
177		case 0x41:
178			info->pc    = nvbios_rd08(bios, data + 0x00);
179			info->dc    = nvbios_rd08(bios, data + 0x01);
180			info->pe    = nvbios_rd08(bios, data + 0x02);
181			info->tx_pu = nvbios_rd08(bios, data + 0x03);
182			break;
183		default:
184			data = 0x0000;
185			break;
186		}
187	}
188	return data;
189}
190
191u16
192nvbios_dpcfg_match(struct nvkm_bios *bios, u16 outp, u8 pc, u8 vs, u8 pe,
193		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
194		   struct nvbios_dpcfg *info)
195{
196	u8 idx = 0xff;
197	u16 data;
198
199	if (*ver >= 0x30) {
200		const u8 vsoff[] = { 0, 4, 7, 9 };
201		idx = (pc * 10) + vsoff[vs] + pe;
202		if (*ver >= 0x40 && *hdr >= 0x12)
203			idx += nvbios_rd08(bios, outp + 0x11) * 40;
204	} else {
205		while ((data = nvbios_dpcfg_entry(bios, outp, ++idx,
206						  ver, hdr, cnt, len))) {
207			if (nvbios_rd08(bios, data + 0x00) == vs &&
208			    nvbios_rd08(bios, data + 0x01) == pe)
209				break;
210		}
211	}
212
213	return nvbios_dpcfg_parse(bios, outp, idx, ver, hdr, cnt, len, info);
214}
215