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

   1 /*
   2  * Copyright 2013 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/cstep.h>
  27
  28 u32
  29 nvbios_cstepTe(struct nvkm_bios *bios,
  30                u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz)
  31 {
  32         struct bit_entry bit_P;
  33         u32 cstep = 0;
  34
  35         if (!bit_entry(bios, 'P', &bit_P)) {
  36                 if (bit_P.version == 2 && bit_P.length >= 0x38)
  37                         cstep = nvbios_rd32(bios, bit_P.offset + 0x34);
  38
  39                 if (cstep) {
  40                         *ver = nvbios_rd08(bios, cstep + 0);
  41                         switch (*ver) {
  42                         case 0x10:
  43                                 *hdr = nvbios_rd08(bios, cstep + 1);
  44                                 *cnt = nvbios_rd08(bios, cstep + 3);
  45                                 *len = nvbios_rd08(bios, cstep + 2);
  46                                 *xnr = nvbios_rd08(bios, cstep + 5);
  47                                 *xsz = nvbios_rd08(bios, cstep + 4);
  48                                 return cstep;
  49                         default:
  50                                 break;
  51                         }
  52                 }
  53         }
  54
  55         return 0;
  56 }
  57
  58 u32
  59 nvbios_cstepEe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
  60 {
  61         u8  cnt, len, xnr, xsz;
  62         u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
  63         if (data && idx < cnt) {
  64                 data = data + *hdr + (idx * len);
  65                 *hdr = len;
  66                 return data;
  67         }
  68         return 0;
  69 }
  70
  71 u32
  72 nvbios_cstepEp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
  73                struct nvbios_cstepE *info)
  74 {
  75         u32 data = nvbios_cstepEe(bios, idx, ver, hdr);
  76         memset(info, 0x00, sizeof(*info));
  77         if (data) {
  78                 info->pstate = (nvbios_rd16(bios, data + 0x00) & 0x01e0) >> 5;
  79                 info->index   = nvbios_rd08(bios, data + 0x03);
  80         }
  81         return data;
  82 }
  83
  84 u32
  85 nvbios_cstepEm(struct nvkm_bios *bios, u8 pstate, u8 *ver, u8 *hdr,
  86                struct nvbios_cstepE *info)
  87 {
  88         u32 data, idx = 0;
  89         while ((data = nvbios_cstepEp(bios, idx++, ver, hdr, info))) {
  90                 if (info->pstate == pstate)
  91                         break;
  92         }
  93         return data;
  94 }
  95
  96 u32
  97 nvbios_cstepXe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
  98 {
  99         u8  cnt, len, xnr, xsz;
 100         u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
 101         if (data && idx < xnr) {
 102                 data = data + *hdr + (cnt * len) + (idx * xsz);
 103                 *hdr = xsz;
 104                 return data;
 105         }
 106         return 0;
 107 }
 108
 109 u32
 110 nvbios_cstepXp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
 111                struct nvbios_cstepX *info)
 112 {
 113         u32 data = nvbios_cstepXe(bios, idx, ver, hdr);
 114         memset(info, 0x00, sizeof(*info));
 115         if (data) {
 116                 info->freq    = nvbios_rd16(bios, data + 0x00) * 1000;
 117                 info->unkn[0] = nvbios_rd08(bios, data + 0x02);
 118                 info->unkn[1] = nvbios_rd08(bios, data + 0x03);
 119                 info->voltage = nvbios_rd08(bios, data + 0x04);
 120         }
 121         return data;
 122 }