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

   1 /*
   2  * Copyright 2016 Karol Herbst
   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: Karol Herbst
  23  */
  24 #include <subdev/bios.h>
  25 #include <subdev/bios/bit.h>
  26 #include <subdev/bios/vpstate.h>
  27
  28 static u32
  29 nvbios_vpstate_offset(struct nvkm_bios *b)
  30 {
  31         struct bit_entry bit_P;
  32
  33         if (!bit_entry(b, 'P', &bit_P)) {
  34                 if (bit_P.version == 2 && bit_P.length >= 0x3c)
  35                         return nvbios_rd32(b, bit_P.offset + 0x38);
  36         }
  37
  38         return 0x0000;
  39 }
  40
  41 int
  42 nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
  43 {
  44         if (!h)
  45                 return -EINVAL;
  46
  47         h->offset = nvbios_vpstate_offset(b);
  48         if (!h->offset)
  49                 return -ENODEV;
  50
  51         h->version = nvbios_rd08(b, h->offset);
  52         switch (h->version) {
  53         case 0x10:
  54                 h->hlen     = nvbios_rd08(b, h->offset + 0x1);
  55                 h->elen     = nvbios_rd08(b, h->offset + 0x2);
  56                 h->slen     = nvbios_rd08(b, h->offset + 0x3);
  57                 h->scount   = nvbios_rd08(b, h->offset + 0x4);
  58                 h->ecount   = nvbios_rd08(b, h->offset + 0x5);
  59
  60                 h->base_id  = nvbios_rd08(b, h->offset + 0x0f);
  61                 if (h->hlen > 0x10)
  62                         h->boost_id = nvbios_rd08(b, h->offset + 0x10);
  63                 else
  64                         h->boost_id = 0xff;
  65                 if (h->hlen > 0x11)
  66                         h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
  67                 else
  68                         h->tdp_id = 0xff;
  69                 return 0;
  70         default:
  71                 return -EINVAL;
  72         }
  73 }
  74
  75 int
  76 nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
  77                      u8 idx, struct nvbios_vpstate_entry *e)
  78 {
  79         u32 offset;
  80
  81         if (!e || !h || idx > h->ecount)
  82                 return -EINVAL;
  83
  84         offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
  85         e->pstate    = nvbios_rd08(b, offset);
  86         e->clock_mhz = nvbios_rd16(b, offset + 0x5);
  87         return 0;
  88 }