1 /* $NetBSD: nouveau_nvkm_subdev_bios_dcb.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_dcb.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include <subdev/bios.h>
30 #include <subdev/bios/dcb.h>
31
32 u16
dcb_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)33 dcb_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
34 {
35 struct nvkm_subdev *subdev = &bios->subdev;
36 struct nvkm_device *device = subdev->device;
37 u16 dcb = 0x0000;
38
39 if (device->card_type > NV_04)
40 dcb = nvbios_rd16(bios, 0x36);
41 if (!dcb) {
42 nvkm_warn(subdev, "DCB table not found\n");
43 return dcb;
44 }
45
46 *ver = nvbios_rd08(bios, dcb);
47
48 if (*ver >= 0x42) {
49 nvkm_warn(subdev, "DCB version 0x%02x unknown\n", *ver);
50 return 0x0000;
51 } else
52 if (*ver >= 0x30) {
53 if (nvbios_rd32(bios, dcb + 6) == 0x4edcbdcb) {
54 *hdr = nvbios_rd08(bios, dcb + 1);
55 *cnt = nvbios_rd08(bios, dcb + 2);
56 *len = nvbios_rd08(bios, dcb + 3);
57 return dcb;
58 }
59 } else
60 if (*ver >= 0x20) {
61 if (nvbios_rd32(bios, dcb + 4) == 0x4edcbdcb) {
62 u16 i2c = nvbios_rd16(bios, dcb + 2);
63 *hdr = 8;
64 *cnt = (i2c - dcb) / 8;
65 *len = 8;
66 return dcb;
67 }
68 } else
69 if (*ver >= 0x15) {
70 if (!nvbios_memcmp(bios, dcb - 7, "DEV_REC", 7)) {
71 u16 i2c = nvbios_rd16(bios, dcb + 2);
72 *hdr = 4;
73 *cnt = (i2c - dcb) / 10;
74 *len = 10;
75 return dcb;
76 }
77 } else {
78 /*
79 * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but
80 * always has the same single (crt) entry, even when tv-out
81 * present, so the conclusion is this version cannot really
82 * be used.
83 *
84 * v1.2 tables (some NV6/10, and NV15+) normally have the
85 * same 5 entries, which are not specific to the card and so
86 * no use.
87 *
88 * v1.2 does have an I2C table that read_dcb_i2c_table can
89 * handle, but cards exist (nv11 in #14821) with a bad i2c
90 * table pointer, so use the indices parsed in
91 * parse_bmp_structure.
92 *
93 * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
94 */
95 nvkm_debug(subdev, "DCB contains no useful data\n");
96 return 0x0000;
97 }
98
99 nvkm_warn(subdev, "DCB header validation failed\n");
100 return 0x0000;
101 }
102
103 u16
dcb_outp(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * len)104 dcb_outp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
105 {
106 u8 hdr, cnt;
107 u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len);
108 if (dcb && idx < cnt)
109 return dcb + hdr + (idx * *len);
110 return 0x0000;
111 }
112
113 static inline u16
dcb_outp_hasht(struct dcb_output * outp)114 dcb_outp_hasht(struct dcb_output *outp)
115 {
116 return (outp->extdev << 8) | (outp->location << 4) | outp->type;
117 }
118
119 static inline u16
dcb_outp_hashm(struct dcb_output * outp)120 dcb_outp_hashm(struct dcb_output *outp)
121 {
122 return (outp->heads << 8) | (outp->link << 6) | outp->or;
123 }
124
125 u16
dcb_outp_parse(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * len,struct dcb_output * outp)126 dcb_outp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
127 struct dcb_output *outp)
128 {
129 u16 dcb = dcb_outp(bios, idx, ver, len);
130 memset(outp, 0x00, sizeof(*outp));
131 if (dcb) {
132 if (*ver >= 0x20) {
133 u32 conn = nvbios_rd32(bios, dcb + 0x00);
134 outp->or = (conn & 0x0f000000) >> 24;
135 outp->location = (conn & 0x00300000) >> 20;
136 outp->bus = (conn & 0x000f0000) >> 16;
137 outp->connector = (conn & 0x0000f000) >> 12;
138 outp->heads = (conn & 0x00000f00) >> 8;
139 outp->i2c_index = (conn & 0x000000f0) >> 4;
140 outp->type = (conn & 0x0000000f);
141 outp->link = 0;
142 } else {
143 dcb = 0x0000;
144 }
145
146 if (*ver >= 0x40) {
147 u32 conf = nvbios_rd32(bios, dcb + 0x04);
148 switch (outp->type) {
149 case DCB_OUTPUT_DP:
150 switch (conf & 0x00e00000) {
151 case 0x00000000: /* 1.62 */
152 outp->dpconf.link_bw = 0x06;
153 break;
154 case 0x00200000: /* 2.7 */
155 outp->dpconf.link_bw = 0x0a;
156 break;
157 case 0x00400000: /* 5.4 */
158 outp->dpconf.link_bw = 0x14;
159 break;
160 case 0x00600000: /* 8.1 */
161 default:
162 outp->dpconf.link_bw = 0x1e;
163 break;
164 }
165
166 switch ((conf & 0x0f000000) >> 24) {
167 case 0xf:
168 case 0x4:
169 outp->dpconf.link_nr = 4;
170 break;
171 case 0x3:
172 case 0x2:
173 outp->dpconf.link_nr = 2;
174 break;
175 case 0x1:
176 default:
177 outp->dpconf.link_nr = 1;
178 break;
179 }
180
181 /* fall-through... */
182 case DCB_OUTPUT_TMDS:
183 case DCB_OUTPUT_LVDS:
184 outp->link = (conf & 0x00000030) >> 4;
185 outp->sorconf.link = outp->link; /*XXX*/
186 outp->extdev = 0x00;
187 if (outp->location != 0)
188 outp->extdev = (conf & 0x0000ff00) >> 8;
189 break;
190 default:
191 break;
192 }
193 }
194
195 outp->hasht = dcb_outp_hasht(outp);
196 outp->hashm = dcb_outp_hashm(outp);
197 }
198 return dcb;
199 }
200
201 u16
dcb_outp_match(struct nvkm_bios * bios,u16 type,u16 mask,u8 * ver,u8 * len,struct dcb_output * outp)202 dcb_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
203 u8 *ver, u8 *len, struct dcb_output *outp)
204 {
205 u16 dcb, idx = 0;
206 while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) {
207 if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) {
208 if ((dcb_outp_hashm(outp) & mask) == mask)
209 break;
210 }
211 }
212 return dcb;
213 }
214
215 int
dcb_outp_foreach(struct nvkm_bios * bios,void * data,int (* exec)(struct nvkm_bios *,void *,int,u16))216 dcb_outp_foreach(struct nvkm_bios *bios, void *data,
217 int (*exec)(struct nvkm_bios *, void *, int, u16))
218 {
219 int ret, idx = -1;
220 u8 ver, len;
221 u16 outp;
222
223 while ((outp = dcb_outp(bios, ++idx, &ver, &len))) {
224 if (nvbios_rd32(bios, outp) == 0x00000000)
225 break; /* seen on an NV11 with DCB v1.5 */
226 if (nvbios_rd32(bios, outp) == 0xffffffff)
227 break; /* seen on an NV17 with DCB v2.0 */
228
229 if (nvbios_rd08(bios, outp) == DCB_OUTPUT_UNUSED)
230 continue;
231 if (nvbios_rd08(bios, outp) == DCB_OUTPUT_EOL)
232 break;
233
234 ret = exec(bios, data, idx, outp);
235 if (ret)
236 return ret;
237 }
238
239 return 0;
240 }
241