79f8511c83
Add SWIOTLB config option and related files to Netlogic platform. Some XLP SoC components like the SD/MMC interface cannot do DMA beyond 32-bit physical address. The SD/MMC driver can use memory outside this range for IO, to support this we have to add bounce buffers implemented by SWIOTLB. Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org Cc: Ganesan Ramalingam <ganesanr@broadcom.com> Patchwork: https://patchwork.linux-mips.org/patch/5410/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*
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* Copyright (C) 2003-2013 Broadcom Corporation
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* All Rights Reserved
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the Broadcom
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/scatterlist.h>
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#include <linux/bootmem.h>
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#include <linux/export.h>
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#include <linux/swiotlb.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/bootinfo.h>
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static char *nlm_swiotlb;
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static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
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{
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void *ret;
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if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
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return ret;
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
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#ifdef CONFIG_ZONE_DMA32
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if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
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gfp |= __GFP_DMA32;
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#endif
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/* Don't invoke OOM killer */
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gfp |= __GFP_NORETRY;
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return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
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}
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static void nlm_dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
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{
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int order = get_order(size);
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if (dma_release_from_coherent(dev, order, vaddr))
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return;
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swiotlb_free_coherent(dev, size, vaddr, dma_handle);
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}
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struct dma_map_ops nlm_swiotlb_dma_ops = {
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.alloc = nlm_dma_alloc_coherent,
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.free = nlm_dma_free_coherent,
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.map_page = swiotlb_map_page,
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.unmap_page = swiotlb_unmap_page,
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.map_sg = swiotlb_map_sg_attrs,
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.unmap_sg = swiotlb_unmap_sg_attrs,
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.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
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.sync_single_for_device = swiotlb_sync_single_for_device,
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.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = swiotlb_sync_sg_for_device,
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.mapping_error = swiotlb_dma_mapping_error,
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.dma_supported = swiotlb_dma_supported
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};
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void __init plat_swiotlb_setup(void)
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{
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size_t swiotlbsize;
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unsigned long swiotlb_nslabs;
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swiotlbsize = 1 << 20; /* 1 MB for now */
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swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
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swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
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swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
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nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
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swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);
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}
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