LXR linux/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
  28u32
  29nvbios_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
  58u32
  59nvbios_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
  71u32
  72nvbios_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
  84u32
  85nvbios_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
  96u32
  97nvbios_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
 109u32
 110nvbios_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}
 123