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Commit 3f2bbf44 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Max Filippov
Browse files

xtensa: use generic dma_noncoherent_ops 



Switch to the generic noncoherent direct mapping implementation.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent 1e4b044d

arch/xtensa/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -4,12 +4,15 @@ config ZONE_DMA 


config XTENSA

	def_bool y

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_NO_COHERENT_DMA_MMAP if !MMU

	select ARCH_WANT_FRAME_POINTERS

	select ARCH_WANT_IPC_PARSE_VERSION

	select BUILDTIME_EXTABLE_SORT

	select CLONE_BACKWARDS

	select COMMON_CLK

	select DMA_NONCOHERENT_OPS

	select GENERIC_ATOMIC64

	select GENERIC_CLOCKEVENTS

	select GENERIC_IRQ_SHOW

arch/xtensa/include/asm/Kbuild

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ generic-y += compat.h 
generic-y += device.h

generic-y += div64.h

generic-y += dma-contiguous.h

generic-y += dma-mapping.h

generic-y += emergency-restart.h

generic-y += exec.h

generic-y += extable.h

arch/xtensa/include/asm/dma-mapping.h

deleted100644 → 0
+0 −26
Original line number Diff line number Diff line 
/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2003 - 2005 Tensilica Inc.

 * Copyright (C) 2015 Cadence Design Systems Inc.

 */



#ifndef _XTENSA_DMA_MAPPING_H

#define _XTENSA_DMA_MAPPING_H



#include <asm/cache.h>

#include <asm/io.h>



#include <linux/mm.h>

#include <linux/scatterlist.h>



extern const struct dma_map_ops xtensa_dma_map_ops;



static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

{

	return &xtensa_dma_map_ops;

}



#endif	/* _XTENSA_DMA_MAPPING_H */

arch/xtensa/kernel/pci-dma.c

+15 −115
Original line number Diff line number Diff line
@@ -16,26 +16,24 @@ 
 */



#include <linux/dma-contiguous.h>

#include <linux/dma-noncoherent.h>

#include <linux/dma-direct.h>

#include <linux/gfp.h>

#include <linux/highmem.h>

#include <linux/mm.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/string.h>

#include <linux/types.h>

#include <asm/cacheflush.h>

#include <asm/io.h>



static void do_cache_op(dma_addr_t dma_handle, size_t size,

static void do_cache_op(phys_addr_t paddr, size_t size,

			void (*fn)(unsigned long, unsigned long))

{

	unsigned long off = dma_handle & (PAGE_SIZE - 1);

	unsigned long pfn = PFN_DOWN(dma_handle);

	unsigned long off = paddr & (PAGE_SIZE - 1);

	unsigned long pfn = PFN_DOWN(paddr);

	struct page *page = pfn_to_page(pfn);



	if (!PageHighMem(page))

		fn((unsigned long)bus_to_virt(dma_handle), size);

		fn((unsigned long)phys_to_virt(paddr), size);

	else

		while (size > 0) {

			size_t sz = min_t(size_t, size, PAGE_SIZE - off);
@@ -49,14 +47,13 @@ static void do_cache_op(dma_addr_t dma_handle, size_t size, 
		}

}



static void xtensa_sync_single_for_cpu(struct device *dev,

				       dma_addr_t dma_handle, size_t size,

				       enum dma_data_direction dir)

void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	switch (dir) {

	case DMA_BIDIRECTIONAL:

	case DMA_FROM_DEVICE:

		do_cache_op(dma_handle, size, __invalidate_dcache_range);

		do_cache_op(paddr, size, __invalidate_dcache_range);

		break;



	case DMA_NONE:
@@ -68,15 +65,14 @@ static void xtensa_sync_single_for_cpu(struct device *dev, 
	}

}



static void xtensa_sync_single_for_device(struct device *dev,

					  dma_addr_t dma_handle, size_t size,

					  enum dma_data_direction dir)

void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	switch (dir) {

	case DMA_BIDIRECTIONAL:

	case DMA_TO_DEVICE:

		if (XCHAL_DCACHE_IS_WRITEBACK)

			do_cache_op(dma_handle, size, __flush_dcache_range);

			do_cache_op(paddr, size, __flush_dcache_range);

		break;



	case DMA_NONE:
@@ -88,40 +84,13 @@ static void xtensa_sync_single_for_device(struct device *dev, 
	}

}



static void xtensa_sync_sg_for_cpu(struct device *dev,

				   struct scatterlist *sg, int nents,

				   enum dma_data_direction dir)

{

	struct scatterlist *s;

	int i;



	for_each_sg(sg, s, nents, i) {

		xtensa_sync_single_for_cpu(dev, sg_dma_address(s),

					   sg_dma_len(s), dir);

	}

}



static void xtensa_sync_sg_for_device(struct device *dev,

				      struct scatterlist *sg, int nents,

				      enum dma_data_direction dir)

{

	struct scatterlist *s;

	int i;



	for_each_sg(sg, s, nents, i) {

		xtensa_sync_single_for_device(dev, sg_dma_address(s),

					      sg_dma_len(s), dir);

	}

}



/*

 * Note: We assume that the full memory space is always mapped to 'kseg'

 *	 Otherwise we have to use page attributes (not implemented).

 */



static void *xtensa_dma_alloc(struct device *dev, size_t size,

			      dma_addr_t *handle, gfp_t flag,

			      unsigned long attrs)

void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,

		gfp_t flag, unsigned long attrs)

{

	unsigned long ret;

	unsigned long uncached;
@@ -171,7 +140,7 @@ static void *xtensa_dma_alloc(struct device *dev, size_t size, 
	return (void *)uncached;

}



static void xtensa_dma_free(struct device *dev, size_t size, void *vaddr,

void arch_dma_free(struct device *dev, size_t size, void *vaddr,

		dma_addr_t dma_handle, unsigned long attrs)

{

	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
@@ -192,72 +161,3 @@ static void xtensa_dma_free(struct device *dev, size_t size, void *vaddr, 
	if (!dma_release_from_contiguous(dev, page, count))

		__free_pages(page, get_order(size));

}
 


static dma_addr_t xtensa_map_page(struct device *dev, struct page *page,

				  unsigned long offset, size_t size,

				  enum dma_data_direction dir,

				  unsigned long attrs)

{

	dma_addr_t dma_handle = page_to_phys(page) + offset;



	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		xtensa_sync_single_for_device(dev, dma_handle, size, dir);



	return dma_handle;

}



static void xtensa_unmap_page(struct device *dev, dma_addr_t dma_handle,

			      size_t size, enum dma_data_direction dir,

			      unsigned long attrs)

{

	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		xtensa_sync_single_for_cpu(dev, dma_handle, size, dir);

}



static int xtensa_map_sg(struct device *dev, struct scatterlist *sg,

			 int nents, enum dma_data_direction dir,

			 unsigned long attrs)

{

	struct scatterlist *s;

	int i;



	for_each_sg(sg, s, nents, i) {

		s->dma_address = xtensa_map_page(dev, sg_page(s), s->offset,

						 s->length, dir, attrs);

	}

	return nents;

}



static void xtensa_unmap_sg(struct device *dev,

			    struct scatterlist *sg, int nents,

			    enum dma_data_direction dir,

			    unsigned long attrs)

{

	struct scatterlist *s;

	int i;



	for_each_sg(sg, s, nents, i) {

		xtensa_unmap_page(dev, sg_dma_address(s),

				  sg_dma_len(s), dir, attrs);

	}

}



int xtensa_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	return 0;

}



const struct dma_map_ops xtensa_dma_map_ops = {

	.alloc = xtensa_dma_alloc,

	.free = xtensa_dma_free,

	.map_page = xtensa_map_page,

	.unmap_page = xtensa_unmap_page,

	.map_sg = xtensa_map_sg,

	.unmap_sg = xtensa_unmap_sg,

	.sync_single_for_cpu = xtensa_sync_single_for_cpu,

	.sync_single_for_device = xtensa_sync_single_for_device,

	.sync_sg_for_cpu = xtensa_sync_sg_for_cpu,

	.sync_sg_for_device = xtensa_sync_sg_for_device,

	.mapping_error = xtensa_dma_mapping_error,

};

EXPORT_SYMBOL(xtensa_dma_map_ops);