drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.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/pci.h>
  26
  27 #if defined(__powerpc__)
  28 struct priv {
  29         const void __iomem *data;
  30         int size;
  31 };
  32
  33 static u32
  34 of_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
  35 {
  36         struct priv *priv = data;
  37         if (offset < priv->size) {
  38                 length = min_t(u32, length, priv->size - offset);
  39                 memcpy_fromio(bios->data + offset, priv->data + offset, length);
  40                 return length;
  41         }
  42         return 0;
  43 }
  44
  45 static u32
  46 of_size(void *data)
  47 {
  48         struct priv *priv = data;
  49         return priv->size;
  50 }
  51
  52 static void *
  53 of_init(struct nvkm_bios *bios, const char *name)
  54 {
  55         struct nvkm_device *device = bios->subdev.device;
  56         struct pci_dev *pdev = device->func->pci(device)->pdev;
  57         struct device_node *dn;
  58         struct priv *priv;
  59         if (!(dn = pci_device_to_OF_node(pdev)))
  60                 return ERR_PTR(-ENODEV);
  61         if (!(priv = kzalloc(sizeof(*priv), GFP_KERNEL)))
  62                 return ERR_PTR(-ENOMEM);
  63         if ((priv->data = of_get_property(dn, "NVDA,BMP", &priv->size)))
  64                 return priv;
  65         kfree(priv);
  66         return ERR_PTR(-EINVAL);
  67 }
  68
  69 const struct nvbios_source
  70 nvbios_of = {
  71         .name = "OpenFirmware",
  72         .init = of_init,
  73         .fini = (void(*)(void *))kfree,
  74         .read = of_read,
  75         .size = of_size,
  76         .rw = false,
  77         .ignore_checksum = true,
  78         .no_pcir = true,
  79 };
  80 #else
  81 const struct nvbios_source
  82 nvbios_of = {
  83 };
  84 #endif