subdev/bios/dcb.c

0001 /*
0002  * Copyright 2012 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Ben Skeggs
0023  */
0024 #include <subdev/bios.h>
0025 #include <subdev/bios/dcb.h>
0026
0027 u16
0028 dcb_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
0029 {
0030     struct nvkm_subdev *subdev = &bios->subdev;
0031     struct nvkm_device *device = subdev->device;
0032     u16 dcb = 0x0000;
0033
0034     if (device->card_type > NV_04)
0035         dcb = nvbios_rd16(bios, 0x36);
0036     if (!dcb) {
0037         nvkm_warn(subdev, "DCB table not found\n");
0038         return dcb;
0039     }
0040
0041     *ver = nvbios_rd08(bios, dcb);
0042
0043     if (*ver >= 0x42) {
0044         nvkm_warn(subdev, "DCB version 0x%02x unknown\n", *ver);
0045         return 0x0000;
0046     } else
0047     if (*ver >= 0x30) {
0048         if (nvbios_rd32(bios, dcb + 6) == 0x4edcbdcb) {
0049             *hdr = nvbios_rd08(bios, dcb + 1);
0050             *cnt = nvbios_rd08(bios, dcb + 2);
0051             *len = nvbios_rd08(bios, dcb + 3);
0052             return dcb;
0053         }
0054     } else
0055     if (*ver >= 0x20) {
0056         if (nvbios_rd32(bios, dcb + 4) == 0x4edcbdcb) {
0057             u16 i2c = nvbios_rd16(bios, dcb + 2);
0058             *hdr = 8;
0059             *cnt = (i2c - dcb) / 8;
0060             *len = 8;
0061             return dcb;
0062         }
0063     } else
0064     if (*ver >= 0x15) {
0065         if (!nvbios_memcmp(bios, dcb - 7, "DEV_REC", 7)) {
0066             u16 i2c = nvbios_rd16(bios, dcb + 2);
0067             *hdr = 4;
0068             *cnt = (i2c - dcb) / 10;
0069             *len = 10;
0070             return dcb;
0071         }
0072     } else {
0073         /*
0074          * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but
0075          * always has the same single (crt) entry, even when tv-out
0076          * present, so the conclusion is this version cannot really
0077          * be used.
0078          *
0079          * v1.2 tables (some NV6/10, and NV15+) normally have the
0080          * same 5 entries, which are not specific to the card and so
0081          * no use.
0082          *
0083          * v1.2 does have an I2C table that read_dcb_i2c_table can
0084          * handle, but cards exist (nv11 in #14821) with a bad i2c
0085          * table pointer, so use the indices parsed in
0086          * parse_bmp_structure.
0087          *
0088          * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
0089          */
0090         nvkm_debug(subdev, "DCB contains no useful data\n");
0091         return 0x0000;
0092     }
0093
0094     nvkm_warn(subdev, "DCB header validation failed\n");
0095     return 0x0000;
0096 }
0097
0098 u16
0099 dcb_outp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
0100 {
0101     u8  hdr, cnt;
0102     u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len);
0103     if (dcb && idx < cnt)
0104         return dcb + hdr + (idx * *len);
0105     return 0x0000;
0106 }
0107
0108 static inline u16
0109 dcb_outp_hasht(struct dcb_output *outp)
0110 {
0111     return (outp->extdev << 8) | (outp->location << 4) | outp->type;
0112 }
0113
0114 static inline u16
0115 dcb_outp_hashm(struct dcb_output *outp)
0116 {
0117     return (outp->heads << 8) | (outp->link << 6) | outp->or;
0118 }
0119
0120 u16
0121 dcb_outp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
0122            struct dcb_output *outp)
0123 {
0124     u16 dcb = dcb_outp(bios, idx, ver, len);
0125     memset(outp, 0x00, sizeof(*outp));
0126     if (dcb) {
0127         if (*ver >= 0x20) {
0128             u32 conn = nvbios_rd32(bios, dcb + 0x00);
0129             outp->or        = (conn & 0x0f000000) >> 24;
0130             outp->location  = (conn & 0x00300000) >> 20;
0131             outp->bus       = (conn & 0x000f0000) >> 16;
0132             outp->connector = (conn & 0x0000f000) >> 12;
0133             outp->heads     = (conn & 0x00000f00) >> 8;
0134             outp->i2c_index = (conn & 0x000000f0) >> 4;
0135             outp->type      = (conn & 0x0000000f);
0136             outp->link      = 0;
0137         } else {
0138             dcb = 0x0000;
0139         }
0140
0141         if (*ver >= 0x40) {
0142             u32 conf = nvbios_rd32(bios, dcb + 0x04);
0143             switch (outp->type) {
0144             case DCB_OUTPUT_DP:
0145                 switch (conf & 0x00e00000) {
0146                 case 0x00000000: /* 1.62 */
0147                     outp->dpconf.link_bw = 0x06;
0148                     break;
0149                 case 0x00200000: /* 2.7 */
0150                     outp->dpconf.link_bw = 0x0a;
0151                     break;
0152                 case 0x00400000: /* 5.4 */
0153                     outp->dpconf.link_bw = 0x14;
0154                     break;
0155                 case 0x00600000: /* 8.1 */
0156                 default:
0157                     outp->dpconf.link_bw = 0x1e;
0158                     break;
0159                 }
0160
0161                 switch ((conf & 0x0f000000) >> 24) {
0162                 case 0xf:
0163                 case 0x4:
0164                     outp->dpconf.link_nr = 4;
0165                     break;
0166                 case 0x3:
0167                 case 0x2:
0168                     outp->dpconf.link_nr = 2;
0169                     break;
0170                 case 0x1:
0171                 default:
0172                     outp->dpconf.link_nr = 1;
0173                     break;
0174                 }
0175                 fallthrough;
0176
0177             case DCB_OUTPUT_TMDS:
0178             case DCB_OUTPUT_LVDS:
0179                 outp->link = (conf & 0x00000030) >> 4;
0180                 outp->sorconf.link = outp->link; /*XXX*/
0181                 outp->extdev = 0x00;
0182                 if (outp->location != 0)
0183                     outp->extdev = (conf & 0x0000ff00) >> 8;
0184                 break;
0185             default:
0186                 break;
0187             }
0188         }
0189
0190         outp->hasht = dcb_outp_hasht(outp);
0191         outp->hashm = dcb_outp_hashm(outp);
0192     }
0193     return dcb;
0194 }
0195
0196 u16
0197 dcb_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
0198            u8 *ver, u8 *len, struct dcb_output *outp)
0199 {
0200     u16 dcb, idx = 0;
0201     while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) {
0202         if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) {
0203             if ((dcb_outp_hashm(outp) & mask) == mask)
0204                 break;
0205         }
0206     }
0207     return dcb;
0208 }
0209
0210 int
0211 dcb_outp_foreach(struct nvkm_bios *bios, void *data,
0212          int (*exec)(struct nvkm_bios *, void *, int, u16))
0213 {
0214     int ret, idx = -1;
0215     u8  ver, len;
0216     u16 outp;
0217
0218     while ((outp = dcb_outp(bios, ++idx, &ver, &len))) {
0219         if (nvbios_rd32(bios, outp) == 0x00000000)
0220             break; /* seen on an NV11 with DCB v1.5 */
0221         if (nvbios_rd32(bios, outp) == 0xffffffff)
0222             break; /* seen on an NV17 with DCB v2.0 */
0223
0224         if (nvbios_rd08(bios, outp) == DCB_OUTPUT_UNUSED)
0225             continue;
0226         if (nvbios_rd08(bios, outp) == DCB_OUTPUT_EOL)
0227             break;
0228
0229         ret = exec(bios, data, idx, outp);
0230         if (ret)
0231             return ret;
0232     }
0233
0234     return 0;
0235 }