release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/lib/devres.c

   1 /*
   2  * Copyright (C) 2008 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/device.h>       /* devres_*(), devm_ioremap_release() */
  11 #include <linux/gfp.h>
  12 #include <linux/io.h>           /* ioremap_flags() */
  13 #include <linux/module.h>       /* EXPORT_SYMBOL() */
  14
  15 /**
  16  * devm_ioremap_prot - Managed ioremap_flags()
  17  * @dev: Generic device to remap IO address for
  18  * @offset: BUS offset to map
  19  * @size: Size of map
  20  * @flags: Page flags
  21  *
  22  * Managed ioremap_prot().  Map is automatically unmapped on driver
  23  * detach.
  24  */
  25 void __iomem *devm_ioremap_prot(struct device *dev, resource_size_t offset,
  26                                  size_t size, unsigned long flags)
  27 {
  28         void __iomem **ptr, *addr;
  29
  30         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  31         if (!ptr)
  32                 return NULL;
  33
  34         addr = ioremap_flags(offset, size, flags);
  35         if (addr) {
  36                 *ptr = addr;
  37                 devres_add(dev, ptr);
  38         } else
  39                 devres_free(ptr);
  40
  41         return addr;
  42 }
  43 EXPORT_SYMBOL(devm_ioremap_prot);