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
  45 static char *nlm_swiotlb;
  46
  47 static 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
  69 static 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
  80 struct 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
  95 void __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 }