drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c

   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 "mxms.h"
  25
  26 #define ROM16(x) get_unaligned_le16(&(x))
  27 #define ROM32(x) get_unaligned_le32(&(x))
  28
  29 static u8 *
  30 mxms_data(struct nvkm_mxm *mxm)
  31 {
  32         return mxm->mxms;
  33
  34 }
  35
  36 u16
  37 mxms_version(struct nvkm_mxm *mxm)
  38 {
  39         u8 *mxms = mxms_data(mxm);
  40         u16 version = (mxms[4] << 8) | mxms[5];
  41         switch (version ) {
  42         case 0x0200:
  43         case 0x0201:
  44         case 0x0300:
  45                 return version;
  46         default:
  47                 break;
  48         }
  49
  50         nvkm_debug(&mxm->subdev, "unknown version %d.%d\n", mxms[4], mxms[5]);
  51         return 0x0000;
  52 }
  53
  54 u16
  55 mxms_headerlen(struct nvkm_mxm *mxm)
  56 {
  57         return 8;
  58 }
  59
  60 u16
  61 mxms_structlen(struct nvkm_mxm *mxm)
  62 {
  63         return *(u16 *)&mxms_data(mxm)[6];
  64 }
  65
  66 bool
  67 mxms_checksum(struct nvkm_mxm *mxm)
  68 {
  69         u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
  70         u8 *mxms = mxms_data(mxm), sum = 0;
  71         while (size--)
  72                 sum += *mxms++;
  73         if (sum) {
  74                 nvkm_debug(&mxm->subdev, "checksum invalid\n");
  75                 return false;
  76         }
  77         return true;
  78 }
  79
  80 bool
  81 mxms_valid(struct nvkm_mxm *mxm)
  82 {
  83         u8 *mxms = mxms_data(mxm);
  84         if (*(u32 *)mxms != 0x5f4d584d) {
  85                 nvkm_debug(&mxm->subdev, "signature invalid\n");
  86                 return false;
  87         }
  88
  89         if (!mxms_version(mxm) || !mxms_checksum(mxm))
  90                 return false;
  91
  92         return true;
  93 }
  94
  95 bool
  96 mxms_foreach(struct nvkm_mxm *mxm, u8 types,
  97              bool (*exec)(struct nvkm_mxm *, u8 *, void *), void *info)
  98 {
  99         struct nvkm_subdev *subdev = &mxm->subdev;
 100         u8 *mxms = mxms_data(mxm);
 101         u8 *desc = mxms + mxms_headerlen(mxm);
 102         u8 *fini = desc + mxms_structlen(mxm) - 1;
 103         while (desc < fini) {
 104                 u8 type = desc[0] & 0x0f;
 105                 u8 headerlen = 0;
 106                 u8 recordlen = 0;
 107                 u8 entries = 0;
 108
 109                 switch (type) {
 110                 case 0: /* Output Device Structure */
 111                         if (mxms_version(mxm) >= 0x0300)
 112                                 headerlen = 8;
 113                         else
 114                                 headerlen = 6;
 115                         break;
 116                 case 1: /* System Cooling Capability Structure */
 117                 case 2: /* Thermal Structure */
 118                 case 3: /* Input Power Structure */
 119                         headerlen = 4;
 120                         break;
 121                 case 4: /* GPIO Device Structure */
 122                         headerlen = 4;
 123                         recordlen = 2;
 124                         entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
 125                         break;
 126                 case 5: /* Vendor Specific Structure */
 127                         headerlen = 8;
 128                         break;
 129                 case 6: /* Backlight Control Structure */
 130                         if (mxms_version(mxm) >= 0x0300) {
 131                                 headerlen = 4;
 132                                 recordlen = 8;
 133                                 entries   = (desc[1] & 0xf0) >> 4;
 134                         } else {
 135                                 headerlen = 8;
 136                         }
 137                         break;
 138                 case 7: /* Fan Control Structure */
 139                         headerlen = 8;
 140                         recordlen = 4;
 141                         entries   = desc[1] & 0x07;
 142                         break;
 143                 default:
 144                         nvkm_debug(subdev, "unknown descriptor type %d\n", type);
 145                         return false;
 146                 }
 147
 148                 if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) {
 149                         static const char * mxms_desc[] = {
 150                                 "ODS", "SCCS", "TS", "IPS",
 151                                 "GSD", "VSS", "BCS", "FCS",
 152                         };
 153                         u8 *dump = desc;
 154                         char data[32], *ptr;
 155                         int i, j;
 156
 157                         for (j = headerlen - 1, ptr = data; j >= 0; j--)
 158                                 ptr += sprintf(ptr, "%02x", dump[j]);
 159                         dump += headerlen;
 160
 161                         nvkm_debug(subdev, "%4s: %s\n", mxms_desc[type], data);
 162                         for (i = 0; i < entries; i++, dump += recordlen) {
 163                                 for (j = recordlen - 1, ptr = data; j >= 0; j--)
 164                                         ptr += sprintf(ptr, "%02x", dump[j]);
 165                                 nvkm_debug(subdev, "      %s\n", data);
 166                         }
 167                 }
 168
 169                 if (types & (1 << type)) {
 170                         if (!exec(mxm, desc, info))
 171                                 return false;
 172                 }
 173
 174                 desc += headerlen + (entries * recordlen);
 175         }
 176
 177         return true;
 178 }
 179
 180 void
 181 mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
 182 {
 183         u64 data = ROM32(pdata[0]);
 184         if (mxms_version(mxm) >= 0x0300)
 185                 data |= (u64)ROM16(pdata[4]) << 32;
 186
 187         desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
 188         desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
 189         desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
 190         desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
 191 }