1/*	$NetBSD: nouveau_nvkm_subdev_bios_disp.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
2
3/*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs
25 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_disp.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29#include <subdev/bios.h>
30#include <subdev/bios/bit.h>
31#include <subdev/bios/disp.h>
32
33u16
34nvbios_disp_table(struct nvkm_bios *bios,
35		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *sub)
36{
37	struct bit_entry U;
38
39	if (!bit_entry(bios, 'U', &U)) {
40		if (U.version == 1) {
41			u16 data = nvbios_rd16(bios, U.offset);
42			if (data) {
43				*ver = nvbios_rd08(bios, data + 0x00);
44				switch (*ver) {
45				case 0x20:
46				case 0x21:
47				case 0x22:
48					*hdr = nvbios_rd08(bios, data + 0x01);
49					*len = nvbios_rd08(bios, data + 0x02);
50					*cnt = nvbios_rd08(bios, data + 0x03);
51					*sub = nvbios_rd08(bios, data + 0x04);
52					return data;
53				default:
54					break;
55				}
56			}
57		}
58	}
59
60	return 0x0000;
61}
62
63u16
64nvbios_disp_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len, u8 *sub)
65{
66	u8  hdr, cnt;
67	u16 data = nvbios_disp_table(bios, ver, &hdr, &cnt, len, sub);
68	if (data && idx < cnt)
69		return data + hdr + (idx * *len);
70	*ver = 0x00;
71	return 0x0000;
72}
73
74u16
75nvbios_disp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len, u8 *sub,
76		  struct nvbios_disp *info)
77{
78	u16 data = nvbios_disp_entry(bios, idx, ver, len, sub);
79	if (data && *len >= 2) {
80		info->data = nvbios_rd16(bios, data + 0);
81		return data;
82	}
83	return 0x0000;
84}
85
86u16
87nvbios_outp_entry(struct nvkm_bios *bios, u8 idx,
88		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
89{
90	struct nvbios_disp info;
91	u16 data = nvbios_disp_parse(bios, idx, ver, len, hdr, &info);
92	if (data) {
93		*cnt = nvbios_rd08(bios, info.data + 0x05);
94		*len = 0x06;
95		data = info.data;
96	}
97	return data;
98}
99
100u16
101nvbios_outp_parse(struct nvkm_bios *bios, u8 idx,
102		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_outp *info)
103{
104	u16 data = nvbios_outp_entry(bios, idx, ver, hdr, cnt, len);
105	if (data && *hdr >= 0x0a) {
106		info->type      = nvbios_rd16(bios, data + 0x00);
107		info->mask      = nvbios_rd32(bios, data + 0x02);
108		if (*ver <= 0x20) /* match any link */
109			info->mask |= 0x00c0;
110		info->script[0] = nvbios_rd16(bios, data + 0x06);
111		info->script[1] = nvbios_rd16(bios, data + 0x08);
112		info->script[2] = 0x0000;
113		if (*hdr >= 0x0c)
114			info->script[2] = nvbios_rd16(bios, data + 0x0a);
115		return data;
116	}
117	return 0x0000;
118}
119
120u16
121nvbios_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
122		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_outp *info)
123{
124	u16 data, idx = 0;
125	while ((data = nvbios_outp_parse(bios, idx++, ver, hdr, cnt, len, info)) || *ver) {
126		if (data && info->type == type) {
127			if ((info->mask & mask) == mask)
128				break;
129		}
130	}
131	return data;
132}
133
134u16
135nvbios_ocfg_entry(struct nvkm_bios *bios, u16 outp, u8 idx,
136		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
137{
138	if (idx < *cnt)
139		return outp + *hdr + (idx * *len);
140	return 0x0000;
141}
142
143u16
144nvbios_ocfg_parse(struct nvkm_bios *bios, u16 outp, u8 idx,
145		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_ocfg *info)
146{
147	u16 data = nvbios_ocfg_entry(bios, outp, idx, ver, hdr, cnt, len);
148	if (data) {
149		info->proto     = nvbios_rd08(bios, data + 0x00);
150		info->flags     = nvbios_rd16(bios, data + 0x01);
151		info->clkcmp[0] = nvbios_rd16(bios, data + 0x02);
152		info->clkcmp[1] = nvbios_rd16(bios, data + 0x04);
153	}
154	return data;
155}
156
157u16
158nvbios_ocfg_match(struct nvkm_bios *bios, u16 outp, u8 proto, u8 flags,
159		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_ocfg *info)
160{
161	u16 data, idx = 0;
162	while ((data = nvbios_ocfg_parse(bios, outp, idx++, ver, hdr, cnt, len, info))) {
163		if ((info->proto == proto || info->proto == 0xff) &&
164		    (info->flags == flags))
165			break;
166	}
167	return data;
168}
169
170u16
171nvbios_oclk_match(struct nvkm_bios *bios, u16 cmp, u32 khz)
172{
173	while (cmp) {
174		if (khz / 10 >= nvbios_rd16(bios, cmp + 0x00))
175			return  nvbios_rd16(bios, cmp + 0x02);
176		cmp += 0x04;
177	}
178	return 0x0000;
179}
180