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

   1 /*
   2  * Copyright 2012 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  */
  23 #include "priv.h"
  24
  25 #include <core/device.h>
  26
  27 struct priv {
  28         struct nvkm_bios *bios;
  29         u32 bar0;
  30 };
  31
  32 static u32
  33 pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
  34 {
  35         u32 i;
  36         if (offset + length <= 0x00100000) {
  37                 for (i = offset; i < offset + length; i += 4)
  38                         *(u32 *)&bios->data[i] = nv_rd32(bios, 0x700000 + i);
  39                 return length;
  40         }
  41         return 0;
  42 }
  43
  44 static void
  45 pramin_fini(void *data)
  46 {
  47         struct priv *priv = data;
  48         if (priv) {
  49                 nv_wr32(priv->bios, 0x001700, priv->bar0);
  50                 kfree(priv);
  51         }
  52 }
  53
  54 static void *
  55 pramin_init(struct nvkm_bios *bios, const char *name)
  56 {
  57         struct priv *priv = NULL;
  58         u64 addr = 0;
  59
  60         /* PRAMIN always potentially available prior to nv50 */
  61         if (nv_device(bios)->card_type < NV_50)
  62                 return NULL;
  63
  64         /* we can't get the bios image pointer without PDISP */
  65         if (nv_device(bios)->card_type >= GM100)
  66                 addr = nv_rd32(bios, 0x021c04);
  67         else
  68         if (nv_device(bios)->card_type >= NV_C0)
  69                 addr = nv_rd32(bios, 0x022500);
  70         if (addr & 0x00000001) {
  71                 nv_debug(bios, "... display disabled\n");
  72                 return ERR_PTR(-ENODEV);
  73         }
  74
  75         /* check that the window is enabled and in vram, particularly
  76          * important as we don't want to be touching vram on an
  77          * uninitialised board
  78          */
  79         addr = nv_rd32(bios, 0x619f04);
  80         if (!(addr & 0x00000008)) {
  81                 nv_debug(bios, "... not enabled\n");
  82                 return ERR_PTR(-ENODEV);
  83         }
  84         if ( (addr & 0x00000003) != 1) {
  85                 nv_debug(bios, "... not in vram\n");
  86                 return ERR_PTR(-ENODEV);
  87         }
  88
  89         /* some alternate method inherited from xf86-video-nv... */
  90         addr = (addr & 0xffffff00) << 8;
  91         if (!addr) {
  92                 addr  = (u64)nv_rd32(bios, 0x001700) << 16;
  93                 addr += 0xf0000;
  94         }
  95
  96         /* modify bar0 PRAMIN window to cover the bios image */
  97         if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
  98                 nv_error(bios, "... out of memory\n");
  99                 return ERR_PTR(-ENOMEM);
 100         }
 101
 102         priv->bios = bios;
 103         priv->bar0 = nv_rd32(bios, 0x001700);
 104         nv_wr32(bios, 0x001700, addr >> 16);
 105         return priv;
 106 }
 107
 108 const struct nvbios_source
 109 nvbios_ramin = {
 110         .name = "PRAMIN",
 111         .init = pramin_init,
 112         .fini = pramin_fini,
 113         .read = pramin_read,
 114         .rw = true,
 115 };