drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0203.c

   1 /*
   2  * Copyright 2014 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/M0203.h>
  27
  28 u32
  29 nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30 {
  31         struct bit_entry bit_M;
  32         u32 data = 0x00000000;
  33
  34         if (!bit_entry(bios, 'M', &bit_M)) {
  35                 if (bit_M.version == 2 && bit_M.length > 0x04)
  36                         data = nv_ro16(bios, bit_M.offset + 0x03);
  37                 if (data) {
  38                         *ver = nv_ro08(bios, data + 0x00);
  39                         switch (*ver) {
  40                         case 0x10:
  41                                 *hdr = nv_ro08(bios, data + 0x01);
  42                                 *len = nv_ro08(bios, data + 0x02);
  43                                 *cnt = nv_ro08(bios, data + 0x03);
  44                                 return data;
  45                         default:
  46                                 break;
  47                         }
  48                 }
  49         }
  50
  51         return 0x00000000;
  52 }
  53
  54 u32
  55 nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
  56                struct nvbios_M0203T *info)
  57 {
  58         u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
  59         memset(info, 0x00, sizeof(*info));
  60         switch (!!data * *ver) {
  61         case 0x10:
  62                 info->type    = nv_ro08(bios, data + 0x04);
  63                 info->pointer = nv_ro16(bios, data + 0x05);
  64                 break;
  65         default:
  66                 break;
  67         }
  68         return data;
  69 }
  70
  71 u32
  72 nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
  73 {
  74         u8  cnt, len;
  75         u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
  76         if (data && idx < cnt) {
  77                 data = data + *hdr + idx * len;
  78                 *hdr = len;
  79                 return data;
  80         }
  81         return 0x00000000;
  82 }
  83
  84 u32
  85 nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
  86                struct nvbios_M0203E *info)
  87 {
  88         u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
  89         memset(info, 0x00, sizeof(*info));
  90         switch (!!data * *ver) {
  91         case 0x10:
  92                 info->type  = (nv_ro08(bios, data + 0x00) & 0x0f) >> 0;
  93                 info->strap = (nv_ro08(bios, data + 0x00) & 0xf0) >> 4;
  94                 info->group = (nv_ro08(bios, data + 0x01) & 0x0f) >> 0;
  95                 return data;
  96         default:
  97                 break;
  98         }
  99         return 0x00000000;
 100 }
 101
 102 u32
 103 nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
 104                struct nvbios_M0203E *info)
 105 {
 106         struct nvbios_M0203T M0203T;
 107         u8  cnt, len, idx = 0xff;
 108         u32 data;
 109
 110         if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
 111                 nv_warn(bios, "M0203T not found\n");
 112                 return 0x00000000;
 113         }
 114
 115         while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
 116                 switch (M0203T.type) {
 117                 case M0203T_TYPE_RAMCFG:
 118                         if (info->strap != ramcfg)
 119                                 continue;
 120                         return data;
 121                 default:
 122                         nv_warn(bios, "M0203T type %02x\n", M0203T.type);
 123                         return 0x00000000;
 124                 }
 125         }
 126
 127         return data;
 128 }