Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 25622e04 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

nios2: use generic dma_noncoherent_ops 



Switch to the generic noncoherent direct mapping implementation.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarLey Foon Tan <ley.foon.tan@intel.com>
Tested-by: default avatarLey Foon Tan <ley.foon.tan@intel.com>
parent 7d63fb3a

arch/nios2/Kconfig

+3 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

config NIOS2

	def_bool y

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select DMA_NONCOHERENT_OPS

	select TIMER_OF

	select GENERIC_ATOMIC64

	select GENERIC_CLOCKEVENTS

arch/nios2/include/asm/Kbuild

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ generic-y += current.h 
generic-y += device.h

generic-y += div64.h

generic-y += dma.h

generic-y += dma-mapping.h

generic-y += emergency-restart.h

generic-y += exec.h

generic-y += extable.h

arch/nios2/include/asm/dma-mapping.h

deleted100644 → 0
+0 −20
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>

 * Copyright (C) 2009 Wind River Systems Inc

 *

 * 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.

 */



#ifndef _ASM_NIOS2_DMA_MAPPING_H

#define _ASM_NIOS2_DMA_MAPPING_H



extern const struct dma_map_ops nios2_dma_ops;



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

{

	return &nios2_dma_ops;

}



#endif /* _ASM_NIOS2_DMA_MAPPING_H */

arch/nios2/mm/dma-mapping.c

+13 −126
Original line number Diff line number Diff line
@@ -12,18 +12,18 @@ 


#include <linux/types.h>

#include <linux/mm.h>

#include <linux/export.h>

#include <linux/string.h>

#include <linux/scatterlist.h>

#include <linux/dma-mapping.h>

#include <linux/io.h>

#include <linux/cache.h>

#include <asm/cacheflush.h>



static inline void __dma_sync_for_device(void *vaddr, size_t size,

			      enum dma_data_direction direction)

void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	switch (direction) {

	void *vaddr = phys_to_virt(paddr);



	switch (dir) {

	case DMA_FROM_DEVICE:

		invalidate_dcache_range((unsigned long)vaddr,

			(unsigned long)(vaddr + size));
@@ -42,10 +42,12 @@ static inline void __dma_sync_for_device(void *vaddr, size_t size, 
	}

}



static inline void __dma_sync_for_cpu(void *vaddr, size_t size,

			      enum dma_data_direction direction)

void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	switch (direction) {

	void *vaddr = phys_to_virt(paddr);



	switch (dir) {

	case DMA_BIDIRECTIONAL:

	case DMA_FROM_DEVICE:

		invalidate_dcache_range((unsigned long)vaddr,
@@ -58,8 +60,8 @@ static inline void __dma_sync_for_cpu(void *vaddr, size_t size, 
	}

}



static void *nios2_dma_alloc(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)

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

		gfp_t gfp, unsigned long attrs)

{

	void *ret;
@@ -80,125 +82,10 @@ static void *nios2_dma_alloc(struct device *dev, size_t size, 
	return ret;

}



static void nios2_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 addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);



	free_pages(addr, get_order(size));

}
 


static int nios2_dma_map_sg(struct device *dev, struct scatterlist *sg,

		int nents, enum dma_data_direction direction,

		unsigned long attrs)

{

	int i;



	for_each_sg(sg, sg, nents, i) {

		void *addr = sg_virt(sg);



		if (!addr)

			continue;



		sg->dma_address = sg_phys(sg);



		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)

			continue;



		__dma_sync_for_device(addr, sg->length, direction);

	}



	return nents;

}



static dma_addr_t nios2_dma_map_page(struct device *dev, struct page *page,

			unsigned long offset, size_t size,

			enum dma_data_direction direction,

			unsigned long attrs)

{

	void *addr = page_address(page) + offset;



	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		__dma_sync_for_device(addr, size, direction);



	return page_to_phys(page) + offset;

}



static void nios2_dma_unmap_page(struct device *dev, dma_addr_t dma_address,

		size_t size, enum dma_data_direction direction,

		unsigned long attrs)

{

	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		__dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);

}



static void nios2_dma_unmap_sg(struct device *dev, struct scatterlist *sg,

		int nhwentries, enum dma_data_direction direction,

		unsigned long attrs)

{

	void *addr;

	int i;



	if (direction == DMA_TO_DEVICE)

		return;



	if (attrs & DMA_ATTR_SKIP_CPU_SYNC)

		return;



	for_each_sg(sg, sg, nhwentries, i) {

		addr = sg_virt(sg);

		if (addr)

			__dma_sync_for_cpu(addr, sg->length, direction);

	}

}



static void nios2_dma_sync_single_for_cpu(struct device *dev,

		dma_addr_t dma_handle, size_t size,

		enum dma_data_direction direction)

{

	__dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);

}



static void nios2_dma_sync_single_for_device(struct device *dev,

		dma_addr_t dma_handle, size_t size,

		enum dma_data_direction direction)

{

	__dma_sync_for_device(phys_to_virt(dma_handle), size, direction);

}



static void nios2_dma_sync_sg_for_cpu(struct device *dev,

		struct scatterlist *sg, int nelems,

		enum dma_data_direction direction)

{

	int i;



	/* Make sure that gcc doesn't leave the empty loop body.  */

	for_each_sg(sg, sg, nelems, i)

		__dma_sync_for_cpu(sg_virt(sg), sg->length, direction);

}



static void nios2_dma_sync_sg_for_device(struct device *dev,

		struct scatterlist *sg, int nelems,

		enum dma_data_direction direction)

{

	int i;



	/* Make sure that gcc doesn't leave the empty loop body.  */

	for_each_sg(sg, sg, nelems, i)

		__dma_sync_for_device(sg_virt(sg), sg->length, direction);



}



const struct dma_map_ops nios2_dma_ops = {

	.alloc			= nios2_dma_alloc,

	.free			= nios2_dma_free,

	.map_page		= nios2_dma_map_page,

	.unmap_page		= nios2_dma_unmap_page,

	.map_sg			= nios2_dma_map_sg,

	.unmap_sg		= nios2_dma_unmap_sg,

	.sync_single_for_device	= nios2_dma_sync_single_for_device,

	.sync_single_for_cpu	= nios2_dma_sync_single_for_cpu,

	.sync_sg_for_cpu	= nios2_dma_sync_sg_for_cpu,

	.sync_sg_for_device	= nios2_dma_sync_sg_for_device,

};

EXPORT_SYMBOL(nios2_dma_ops);