text: /*
  *  Copyright (C) 2003-2013 Broadcom Corporation
  *  All Rights Reserved
   *
   * This software is available to you under a choice of one of two
   * licenses.  You may choose to be licensed under the terms of the GNU
   * General Public License (GPL) Version 2, available from the file
   * COPYING in the main directory of this source tree, or the Broadcom
   * license below:
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
   * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  #include <linux/dma-mapping.h>
  #include <linux/scatterlist.h>
  #include <linux/bootmem.h>
  #include <linux/export.h>
  #include <linux/swiotlb.h>
  #include <linux/types.h>
  #include <linux/init.h>
  #include <linux/mm.h>
  
  #include <asm/bootinfo.h>
  
  static char *nlm_swiotlb;
  
  static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
  	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
  {
  	/* ignore region specifiers */
  	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  
  #ifdef CONFIG_ZONE_DMA32
  	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
  		gfp |= __GFP_DMA32;
  #endif
  
  	/* Don't invoke OOM killer */
  	gfp |= __GFP_NORETRY;
  
  	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  }
  
  static void nlm_dma_free_coherent(struct device *dev, size_t size,
  	void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
  {
  	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
  }
  
  struct dma_map_ops nlm_swiotlb_dma_ops = {
  	.alloc = nlm_dma_alloc_coherent,
  	.free = nlm_dma_free_coherent,
  	.map_page = swiotlb_map_page,
  	.unmap_page = swiotlb_unmap_page,
  	.map_sg = swiotlb_map_sg_attrs,
  	.unmap_sg = swiotlb_unmap_sg_attrs,
  	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  	.sync_single_for_device = swiotlb_sync_single_for_device,
  	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  	.sync_sg_for_device = swiotlb_sync_sg_for_device,
  	.mapping_error = swiotlb_dma_mapping_error,
  	.dma_supported = swiotlb_dma_supported
  };
  
  void __init plat_swiotlb_setup(void)
  {
  	size_t swiotlbsize;
  	unsigned long swiotlb_nslabs;
  
  	swiotlbsize = 1 << 20; /* 1 MB for now */
  	swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
  	swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
  	swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
  
  	nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
  	swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);
  }
  