LXR linux/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__)
  28struct priv {
  29        const void __iomem *data;
  30        int size;
  31};
  32
  33static u32
  34of_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
  45static u32
  46of_size(void *data)
  47{
  48        struct priv *priv = data;
  49        return priv->size;
  50}
  51
  52static void *
  53of_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
  69const struct nvbios_source
  70nvbios_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
  81const struct nvbios_source
  82nvbios_of = {
  83};
  84#endif
  85