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/disp.h>
27 
28 u16
nvbios_disp_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len,u8 * sub)29 nvbios_disp_table(struct nvkm_bios *bios,
30 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *sub)
31 {
32 	struct bit_entry U;
33 
34 	if (!bit_entry(bios, 'U', &U)) {
35 		if (U.version == 1) {
36 			u16 data = nvbios_rd16(bios, U.offset);
37 			if (data) {
38 				*ver = nvbios_rd08(bios, data + 0x00);
39 				switch (*ver) {
40 				case 0x20:
41 				case 0x21:
42 				case 0x22:
43 					*hdr = nvbios_rd08(bios, data + 0x01);
44 					*len = nvbios_rd08(bios, data + 0x02);
45 					*cnt = nvbios_rd08(bios, data + 0x03);
46 					*sub = nvbios_rd08(bios, data + 0x04);
47 					return data;
48 				default:
49 					break;
50 				}
51 			}
52 		}
53 	}
54 
55 	return 0x0000;
56 }
57 
58 u16
nvbios_disp_entry(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * len,u8 * sub)59 nvbios_disp_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len, u8 *sub)
60 {
61 	u8  hdr, cnt;
62 	u16 data = nvbios_disp_table(bios, ver, &hdr, &cnt, len, sub);
63 	if (data && idx < cnt)
64 		return data + hdr + (idx * *len);
65 	*ver = 0x00;
66 	return 0x0000;
67 }
68 
69 u16
nvbios_disp_parse(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * len,u8 * sub,struct nvbios_disp * info)70 nvbios_disp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len, u8 *sub,
71 		  struct nvbios_disp *info)
72 {
73 	u16 data = nvbios_disp_entry(bios, idx, ver, len, sub);
74 	if (data && *len >= 2) {
75 		info->data = nvbios_rd16(bios, data + 0);
76 		return data;
77 	}
78 	return 0x0000;
79 }
80 
81 u16
nvbios_outp_entry(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)82 nvbios_outp_entry(struct nvkm_bios *bios, u8 idx,
83 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
84 {
85 	struct nvbios_disp info;
86 	u16 data = nvbios_disp_parse(bios, idx, ver, len, hdr, &info);
87 	if (data) {
88 		*cnt = nvbios_rd08(bios, info.data + 0x05);
89 		*len = 0x06;
90 		data = info.data;
91 	}
92 	return data;
93 }
94 
95 u16
nvbios_outp_parse(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * hdr,u8 * cnt,u8 * len,struct nvbios_outp * info)96 nvbios_outp_parse(struct nvkm_bios *bios, u8 idx,
97 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_outp *info)
98 {
99 	u16 data = nvbios_outp_entry(bios, idx, ver, hdr, cnt, len);
100 	if (data && *hdr >= 0x0a) {
101 		info->type      = nvbios_rd16(bios, data + 0x00);
102 		info->mask      = nvbios_rd32(bios, data + 0x02);
103 		if (*ver <= 0x20) /* match any link */
104 			info->mask |= 0x00c0;
105 		info->script[0] = nvbios_rd16(bios, data + 0x06);
106 		info->script[1] = nvbios_rd16(bios, data + 0x08);
107 		info->script[2] = 0x0000;
108 		if (*hdr >= 0x0c)
109 			info->script[2] = nvbios_rd16(bios, data + 0x0a);
110 		return data;
111 	}
112 	return 0x0000;
113 }
114 
115 u16
nvbios_outp_match(struct nvkm_bios * bios,u16 type,u16 mask,u8 * ver,u8 * hdr,u8 * cnt,u8 * len,struct nvbios_outp * info)116 nvbios_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
117 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_outp *info)
118 {
119 	u16 data, idx = 0;
120 	while ((data = nvbios_outp_parse(bios, idx++, ver, hdr, cnt, len, info)) || *ver) {
121 		if (data && info->type == type) {
122 			if ((info->mask & mask) == mask)
123 				break;
124 		}
125 	}
126 	return data;
127 }
128 
129 u16
nvbios_ocfg_entry(struct nvkm_bios * bios,u16 outp,u8 idx,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)130 nvbios_ocfg_entry(struct nvkm_bios *bios, u16 outp, u8 idx,
131 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
132 {
133 	if (idx < *cnt)
134 		return outp + *hdr + (idx * *len);
135 	return 0x0000;
136 }
137 
138 u16
nvbios_ocfg_parse(struct nvkm_bios * bios,u16 outp,u8 idx,u8 * ver,u8 * hdr,u8 * cnt,u8 * len,struct nvbios_ocfg * info)139 nvbios_ocfg_parse(struct nvkm_bios *bios, u16 outp, u8 idx,
140 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_ocfg *info)
141 {
142 	u16 data = nvbios_ocfg_entry(bios, outp, idx, ver, hdr, cnt, len);
143 	if (data) {
144 		info->proto     = nvbios_rd08(bios, data + 0x00);
145 		info->flags     = nvbios_rd16(bios, data + 0x01);
146 		info->clkcmp[0] = nvbios_rd16(bios, data + 0x02);
147 		info->clkcmp[1] = nvbios_rd16(bios, data + 0x04);
148 	}
149 	return data;
150 }
151 
152 u16
nvbios_ocfg_match(struct nvkm_bios * bios,u16 outp,u8 proto,u8 flags,u8 * ver,u8 * hdr,u8 * cnt,u8 * len,struct nvbios_ocfg * info)153 nvbios_ocfg_match(struct nvkm_bios *bios, u16 outp, u8 proto, u8 flags,
154 		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_ocfg *info)
155 {
156 	u16 data, idx = 0;
157 	while ((data = nvbios_ocfg_parse(bios, outp, idx++, ver, hdr, cnt, len, info))) {
158 		if ((info->proto == proto || info->proto == 0xff) &&
159 		    (info->flags == flags))
160 			break;
161 	}
162 	return data;
163 }
164 
165 u16
nvbios_oclk_match(struct nvkm_bios * bios,u16 cmp,u32 khz)166 nvbios_oclk_match(struct nvkm_bios *bios, u16 cmp, u32 khz)
167 {
168 	while (cmp) {
169 		if (khz / 10 >= nvbios_rd16(bios, cmp + 0x00))
170 			return  nvbios_rd16(bios, cmp + 0x02);
171 		cmp += 0x04;
172 	}
173 	return 0x0000;
174 }
175