drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr5.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 <bskeggs@redhat.com>
  23  */
  24 #include "ram.h"
  25
  26 /* binary driver only executes this path if the condition (a) is true
  27  * for any configuration (combination of rammap+ramcfg+timing) that
  28  * can be reached on a given card.  for now, we will execute the branch
  29  * unconditionally in the hope that a "false everywhere" in the bios
  30  * tables doesn't actually mean "don't touch this".
  31  */
  32 #define NOTE00(a) 1
  33
  34 int
  35 nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts)
  36 {
  37         int pd, lf, xd, vh, vr, vo, l3;
  38         int WL, CL, WR, at[2], dt, ds;
  39         int rq = ram->freq < 1000000; /* XXX */
  40
  41         xd = !ram->next->bios.ramcfg_DLLoff;
  42
  43         switch (ram->next->bios.ramcfg_ver) {
  44         case 0x11:
  45                 pd =  ram->next->bios.ramcfg_11_01_80;
  46                 lf =  ram->next->bios.ramcfg_11_01_40;
  47                 vh =  ram->next->bios.ramcfg_11_02_10;
  48                 vr =  ram->next->bios.ramcfg_11_02_04;
  49                 vo =  ram->next->bios.ramcfg_11_06;
  50                 l3 = !ram->next->bios.ramcfg_11_07_02;
  51                 break;
  52         default:
  53                 return -ENOSYS;
  54         }
  55
  56         switch (ram->next->bios.timing_ver) {
  57         case 0x20:
  58                 WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
  59                 CL = (ram->next->bios.timing[1] & 0x0000001f);
  60                 WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
  61                 at[0] = ram->next->bios.timing_20_2e_c0;
  62                 at[1] = ram->next->bios.timing_20_2e_30;
  63                 dt =  ram->next->bios.timing_20_2e_03;
  64                 ds =  ram->next->bios.timing_20_2f_03;
  65                 break;
  66         default:
  67                 return -ENOSYS;
  68         }
  69
  70         if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35)
  71                 return -EINVAL;
  72         CL -= 5;
  73         WR -= 4;
  74
  75         ram->mr[0] &= ~0xf7f;
  76         ram->mr[0] |= (WR & 0x0f) << 8;
  77         ram->mr[0] |= (CL & 0x0f) << 3;
  78         ram->mr[0] |= (WL & 0x07) << 0;
  79
  80         ram->mr[1] &= ~0x0bf;
  81         ram->mr[1] |= (xd & 0x01) << 7;
  82         ram->mr[1] |= (at[0] & 0x03) << 4;
  83         ram->mr[1] |= (dt & 0x03) << 2;
  84         ram->mr[1] |= (ds & 0x03) << 0;
  85
  86         /* this seems wrong, alternate field used for the broadcast
  87          * on nuts vs non-nuts configs..  meh, it matches for now.
  88          */
  89         ram->mr1_nuts = ram->mr[1];
  90         if (nuts) {
  91                 ram->mr[1] &= ~0x030;
  92                 ram->mr[1] |= (at[1] & 0x03) << 4;
  93         }
  94
  95         ram->mr[3] &= ~0x020;
  96         ram->mr[3] |= (rq & 0x01) << 5;
  97
  98         ram->mr[5] &= ~0x004;
  99         ram->mr[5] |= (l3 << 2);
 100
 101         if (!vo)
 102                 vo = (ram->mr[6] & 0xff0) >> 4;
 103         if (ram->mr[6] & 0x001)
 104                 pd = 1; /* binary driver does this.. bug? */
 105         ram->mr[6] &= ~0xff1;
 106         ram->mr[6] |= (vo & 0xff) << 4;
 107         ram->mr[6] |= (pd & 0x01) << 0;
 108
 109         if (NOTE00(vr)) {
 110                 ram->mr[7] &= ~0x300;
 111                 ram->mr[7] |= (vr & 0x03) << 8;
 112         }
 113         ram->mr[7] &= ~0x088;
 114         ram->mr[7] |= (vh & 0x01) << 7;
 115         ram->mr[7] |= (lf & 0x01) << 3;
 116
 117         ram->mr[8] &= ~0x003;
 118         ram->mr[8] |= (WR & 0x10) >> 3;
 119         ram->mr[8] |= (CL & 0x10) >> 4;
 120         return 0;
 121 }