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 struct priv {
  26         struct nvkm_bios *bios;
  27         u32 bar0;
  28 };
  29
  30 static u32
  31 pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
  32 {
  33         struct nvkm_device *device = bios->subdev.device;
  34         u32 i;
  35         if (offset + length <= 0x00100000) {
  36                 for (i = offset; i < offset + length; i += 4)
  37                         *(u32 *)&bios->data[i] = nvkm_rd32(device, 0x700000 + i);
  38                 return length;
  39         }
  40         return 0;
  41 }
  42
  43 static void
  44 pramin_fini(void *data)
  45 {
  46         struct priv *priv = data;
  47         if (priv) {
  48                 struct nvkm_device *device = priv->bios->subdev.device;
  49                 nvkm_wr32(device, 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 nvkm_subdev *subdev = &bios->subdev;
  58         struct nvkm_device *device = subdev->device;
  59         struct priv *priv = NULL;
  60         u64 addr = 0;
  61
  62         /* PRAMIN always potentially available prior to nv50 */
  63         if (device->card_type < NV_50)
  64                 return NULL;
  65
  66         /* we can't get the bios image pointer without PDISP */
  67         if (device->card_type >= GM100)
  68                 addr = nvkm_rd32(device, 0x021c04);
  69         else
  70         if (device->card_type >= NV_C0)
  71                 addr = nvkm_rd32(device, 0x022500);
  72         if (addr & 0x00000001) {
  73                 nvkm_debug(subdev, "... display disabled\n");
  74                 return ERR_PTR(-ENODEV);
  75         }
  76
  77         /* check that the window is enabled and in vram, particularly
  78          * important as we don't want to be touching vram on an
  79          * uninitialised board
  80          */
  81         if (device->card_type >= GV100)
  82                 addr = nvkm_rd32(device, 0x625f04);
  83         else
  84                 addr = nvkm_rd32(device, 0x619f04);
  85         if (!(addr & 0x00000008)) {
  86                 nvkm_debug(subdev, "... not enabled\n");
  87                 return ERR_PTR(-ENODEV);
  88         }
  89         if ( (addr & 0x00000003) != 1) {
  90                 nvkm_debug(subdev, "... not in vram\n");
  91                 return ERR_PTR(-ENODEV);
  92         }
  93
  94         /* some alternate method inherited from xf86-video-nv... */
  95         addr = (addr & 0xffffff00) << 8;
  96         if (!addr) {
  97                 addr  = (u64)nvkm_rd32(device, 0x001700) << 16;
  98                 addr += 0xf0000;
  99         }
 100
 101         /* modify bar0 PRAMIN window to cover the bios image */
 102         if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
 103                 nvkm_error(subdev, "... out of memory\n");
 104                 return ERR_PTR(-ENOMEM);
 105         }
 106
 107         priv->bios = bios;
 108         priv->bar0 = nvkm_rd32(device, 0x001700);
 109         nvkm_wr32(device, 0x001700, addr >> 16);
 110         return priv;
 111 }
 112
 113 const struct nvbios_source
 114 nvbios_ramin = {
 115         .name = "PRAMIN",
 116         .init = pramin_init,
 117         .fini = pramin_fini,
 118         .read = pramin_read,
 119         .rw = true,
 120 };