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arc: use generic dma_noncoherent_ops
Switch to the generic noncoherent direct mapping implementation. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Alexey Brodkin <abrodkin@synopsys.com> Acked-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Christoph Hellwig
parent
a8eb92d02d
commit
6c3e71dd63
4 changed files with 18 additions and 148 deletions
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@ -9,11 +9,15 @@
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config ARC
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def_bool y
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select ARC_TIMERS
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select ARCH_HAS_SYNC_DMA_FOR_CPU
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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select ARCH_HAS_SG_CHAIN
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select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
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select BUILDTIME_EXTABLE_SORT
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select CLONE_BACKWARDS
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select COMMON_CLK
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select DMA_NONCOHERENT_OPS
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select DMA_NONCOHERENT_MMAP
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select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
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select GENERIC_CLOCKEVENTS
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select GENERIC_FIND_FIRST_BIT
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@ -2,6 +2,7 @@
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generic-y += bugs.h
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generic-y += device.h
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generic-y += div64.h
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generic-y += dma-mapping.h
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generic-y += emergency-restart.h
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generic-y += extable.h
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generic-y += fb.h
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@ -1,21 +0,0 @@
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/*
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* DMA Mapping glue for ARC
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*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef ASM_ARC_DMA_MAPPING_H
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#define ASM_ARC_DMA_MAPPING_H
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extern const struct dma_map_ops arc_dma_ops;
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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return &arc_dma_ops;
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}
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#endif
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@ -16,13 +16,12 @@
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* The default DMA address == Phy address which is 0x8000_0000 based.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/dma-noncoherent.h>
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#include <asm/cache.h>
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#include <asm/cacheflush.h>
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static void *arc_dma_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
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void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs)
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{
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unsigned long order = get_order(size);
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struct page *page;
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@ -89,7 +88,7 @@ static void *arc_dma_alloc(struct device *dev, size_t size,
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return kvaddr;
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}
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static void arc_dma_free(struct device *dev, size_t size, void *vaddr,
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void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle, unsigned long attrs)
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{
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phys_addr_t paddr = dma_handle;
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@ -105,7 +104,7 @@ static void arc_dma_free(struct device *dev, size_t size, void *vaddr,
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__free_pages(page, get_order(size));
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}
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static int arc_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs)
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{
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@ -130,127 +129,14 @@ static int arc_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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return ret;
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}
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static void arc_dma_sync_single_for_device(struct device *dev,
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dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
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void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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dma_cache_wback(dma_handle, size);
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dma_cache_wback(paddr, size);
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}
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static void arc_dma_sync_single_for_cpu(struct device *dev,
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dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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dma_cache_inv(dma_handle, size);
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dma_cache_inv(paddr, size);
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}
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/*
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* arc_dma_map_page - map a portion of a page for streaming DMA
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*
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* Ensure that any data held in the cache is appropriately discarded
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* or written back.
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*
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* The device owns this memory once this call has completed. The CPU
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* can regain ownership by calling dma_unmap_page().
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*
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* Note: while it takes struct page as arg, caller can "abuse" it to pass
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* a region larger than PAGE_SIZE, provided it is physically contiguous
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* and this still works correctly
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*/
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static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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phys_addr_t paddr = page_to_phys(page) + offset;
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if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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arc_dma_sync_single_for_device(dev, paddr, size, dir);
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return paddr;
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}
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/*
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* arc_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
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*
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* After this call, reads by the CPU to the buffer are guaranteed to see
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* whatever the device wrote there.
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*
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* Note: historically this routine was not implemented for ARC
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*/
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static void arc_dma_unmap_page(struct device *dev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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phys_addr_t paddr = handle;
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if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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arc_dma_sync_single_for_cpu(dev, paddr, size, dir);
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}
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static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir, unsigned long attrs)
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{
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struct scatterlist *s;
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int i;
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for_each_sg(sg, s, nents, i)
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s->dma_address = dma_map_page(dev, sg_page(s), s->offset,
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s->length, dir);
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return nents;
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}
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static void arc_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs)
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{
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struct scatterlist *s;
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int i;
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for_each_sg(sg, s, nents, i)
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arc_dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir,
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attrs);
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}
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static void arc_dma_sync_sg_for_cpu(struct device *dev,
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struct scatterlist *sglist, int nelems,
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enum dma_data_direction dir)
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{
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int i;
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struct scatterlist *sg;
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for_each_sg(sglist, sg, nelems, i)
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arc_dma_sync_single_for_cpu(dev, sg_phys(sg), sg->length, dir);
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}
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static void arc_dma_sync_sg_for_device(struct device *dev,
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struct scatterlist *sglist, int nelems,
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enum dma_data_direction dir)
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{
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int i;
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struct scatterlist *sg;
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for_each_sg(sglist, sg, nelems, i)
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arc_dma_sync_single_for_device(dev, sg_phys(sg), sg->length,
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dir);
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}
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static int arc_dma_supported(struct device *dev, u64 dma_mask)
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{
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/* Support 32 bit DMA mask exclusively */
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return dma_mask == DMA_BIT_MASK(32);
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}
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const struct dma_map_ops arc_dma_ops = {
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.alloc = arc_dma_alloc,
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.free = arc_dma_free,
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.mmap = arc_dma_mmap,
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.map_page = arc_dma_map_page,
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.unmap_page = arc_dma_unmap_page,
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.map_sg = arc_dma_map_sg,
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.unmap_sg = arc_dma_unmap_sg,
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.sync_single_for_device = arc_dma_sync_single_for_device,
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.sync_single_for_cpu = arc_dma_sync_single_for_cpu,
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.sync_sg_for_cpu = arc_dma_sync_sg_for_cpu,
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.sync_sg_for_device = arc_dma_sync_sg_for_device,
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.dma_supported = arc_dma_supported,
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};
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EXPORT_SYMBOL(arc_dma_ops);
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