LXR linux/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
  34int
  35nvkm_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}
 122