LXR linux/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
  28static u32
  29nvbios_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
  41int
  42nvbios_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
  75int
  76nvbios_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}
  89