LXR linux/arch/mips/netlogic/common/nlm-dma.c

   1/*
   2*  Copyright (C) 2003-2013 Broadcom Corporation
   3*  All Rights Reserved
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the Broadcom
   9 * license below:
  10 *
  11 * Redistribution and use in source and binary forms, with or without
  12 * modification, are permitted provided that the following conditions
  13 * are met:
  14 *
  15 * 1. Redistributions of source code must retain the above copyright
  16 *    notice, this list of conditions and the following disclaimer.
  17 * 2. Redistributions in binary form must reproduce the above copyright
  18 *    notice, this list of conditions and the following disclaimer in
  19 *    the documentation and/or other materials provided with the
  20 *    distribution.
  21 *
  22 * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
  23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25 * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
  26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34#include <linux/dma-mapping.h>
  35#include <linux/scatterlist.h>
  36#include <linux/bootmem.h>
  37#include <linux/export.h>
  38#include <linux/swiotlb.h>
  39#include <linux/types.h>
  40#include <linux/init.h>
  41#include <linux/mm.h>
  42
  43#include <asm/bootinfo.h>
  44
  45static char *nlm_swiotlb;
  46
  47static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
  48        dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
  49{
  50        void *ret;
  51
  52        if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
  53                return ret;
  54
  55        /* ignore region specifiers */
  56        gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  57
  58#ifdef CONFIG_ZONE_DMA32
  59        if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
  60                gfp |= __GFP_DMA32;
  61#endif
  62
  63        /* Don't invoke OOM killer */
  64        gfp |= __GFP_NORETRY;
  65
  66        return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  67}
  68
  69static void nlm_dma_free_coherent(struct device *dev, size_t size,
  70        void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
  71{
  72        int order = get_order(size);
  73
  74        if (dma_release_from_coherent(dev, order, vaddr))
  75                return;
  76
  77        swiotlb_free_coherent(dev, size, vaddr, dma_handle);
  78}
  79
  80struct dma_map_ops nlm_swiotlb_dma_ops = {
  81        .alloc = nlm_dma_alloc_coherent,
  82        .free = nlm_dma_free_coherent,
  83        .map_page = swiotlb_map_page,
  84        .unmap_page = swiotlb_unmap_page,
  85        .map_sg = swiotlb_map_sg_attrs,
  86        .unmap_sg = swiotlb_unmap_sg_attrs,
  87        .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  88        .sync_single_for_device = swiotlb_sync_single_for_device,
  89        .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  90        .sync_sg_for_device = swiotlb_sync_sg_for_device,
  91        .mapping_error = swiotlb_dma_mapping_error,
  92        .dma_supported = swiotlb_dma_supported
  93};
  94
  95void __init plat_swiotlb_setup(void)
  96{
  97        size_t swiotlbsize;
  98        unsigned long swiotlb_nslabs;
  99
 100        swiotlbsize = 1 << 20; /* 1 MB for now */
 101        swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
 102        swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
 103        swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
 104
 105        nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
 106        swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);
 107}
 108