LXR linux/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
  25struct priv {
  26        struct nvkm_bios *bios;
  27        u32 bar0;
  28};
  29
  30static u32
  31pramin_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
  43static void
  44pramin_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
  54static void *
  55pramin_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        addr = nvkm_rd32(device, 0x619f04);
  82        if (!(addr & 0x00000008)) {
  83                nvkm_debug(subdev, "... not enabled\n");
  84                return ERR_PTR(-ENODEV);
  85        }
  86        if ( (addr & 0x00000003) != 1) {
  87                nvkm_debug(subdev, "... not in vram\n");
  88                return ERR_PTR(-ENODEV);
  89        }
  90
  91        /* some alternate method inherited from xf86-video-nv... */
  92        addr = (addr & 0xffffff00) << 8;
  93        if (!addr) {
  94                addr  = (u64)nvkm_rd32(device, 0x001700) << 16;
  95                addr += 0xf0000;
  96        }
  97
  98        /* modify bar0 PRAMIN window to cover the bios image */
  99        if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
 100                nvkm_error(subdev, "... out of memory\n");
 101                return ERR_PTR(-ENOMEM);
 102        }
 103
 104        priv->bios = bios;
 105        priv->bar0 = nvkm_rd32(device, 0x001700);
 106        nvkm_wr32(device, 0x001700, addr >> 16);
 107        return priv;
 108}
 109
 110const struct nvbios_source
 111nvbios_ramin = {
 112        .name = "PRAMIN",
 113        .init = pramin_init,
 114        .fini = pramin_fini,
 115        .read = pramin_read,
 116        .rw = true,
 117};
 118