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 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 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 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 120 dcb_outp_hashm(struct dcb_output *outp) 121 { 122 return (outp->heads << 8) | (outp->link << 6) | outp->or; 123 } 124 125 u16 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 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 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
Indexes created Sat Sep 20 22:09:52 GMT 2025