arch/mips/mm/dma-default.c - kernel/msm - Gitiles

 /*
  * 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) 2000  Ani Joshi <ajoshi@unixbox.com>
  * Copyright (C) 2000, 2001, 06  Ralf Baechle <ralf@linux-mips.org>
  * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
  */

 #include <linux/types.h>
 #include <linux/dma-mapping.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/scatterlist.h>
 #include <linux/string.h>
 #include <linux/gfp.h>

 #include <asm/cache.h>
 #include <asm/io.h>

 #include <dma-coherence.h>

 static inline unsigned long dma_addr_to_virt(struct device *dev,
 	dma_addr_t dma_addr)
 {
 	unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);

 	return (unsigned long)phys_to_virt(addr);
 }

 /*
  * Warning on the terminology - Linux calls an uncached area coherent;
  * MIPS terminology calls memory areas with hardware maintained coherency
  * coherent.
  */

 static inline int cpu_is_noncoherent_r10000(struct device *dev)
 {
 	return !plat_device_is_coherent(dev) &&
 	       (current_cpu_type() == CPU_R10000 ||
 	       current_cpu_type() == CPU_R12000);
 }

 static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
 {
 	gfp_t dma_flag;

 	/* ignore region specifiers */
 	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);

 #ifdef CONFIG_ISA
 	if (dev == NULL)
 		dma_flag = __GFP_DMA;
 	else
 #endif
 #if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
 	     if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
 			dma_flag = __GFP_DMA;
 	else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
 			dma_flag = __GFP_DMA32;
 	else
 #endif
 #if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
 	     if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
 		dma_flag = __GFP_DMA32;
 	else
 #endif
 #if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
 	     if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
 		dma_flag = __GFP_DMA;
 	else
 #endif
 		dma_flag = 0;

 	/* Don't invoke OOM killer */
 	gfp |= __GFP_NORETRY;

 	return gfp | dma_flag;
 }

 void *dma_alloc_noncoherent(struct device *dev, size_t size,
 	dma_addr_t * dma_handle, gfp_t gfp)
 {
 	void *ret;

 	gfp = massage_gfp_flags(dev, gfp);

 	ret = (void *) __get_free_pages(gfp, get_order(size));

 	if (ret != NULL) {
 		memset(ret, 0, size);
 		*dma_handle = plat_map_dma_mem(dev, ret, size);
 	}

 	return ret;
 }
 EXPORT_SYMBOL(dma_alloc_noncoherent);

 static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
 	dma_addr_t * dma_handle, gfp_t gfp)
 {
 	void *ret;

 	if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
 		return ret;

 	gfp = massage_gfp_flags(dev, gfp);

 	ret = (void *) __get_free_pages(gfp, get_order(size));

 	if (ret) {
 		memset(ret, 0, size);
 		*dma_handle = plat_map_dma_mem(dev, ret, size);

 		if (!plat_device_is_coherent(dev)) {
 			dma_cache_wback_inv((unsigned long) ret, size);
 			ret = UNCAC_ADDR(ret);
 		}
 	}

 	return ret;
 }


 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 	dma_addr_t dma_handle)
 {
 	plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 	free_pages((unsigned long) vaddr, get_order(size));
 }
 EXPORT_SYMBOL(dma_free_noncoherent);

 static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 	dma_addr_t dma_handle)
 {
 	unsigned long addr = (unsigned long) vaddr;
 	int order = get_order(size);

 	if (dma_release_from_coherent(dev, order, vaddr))
 		return;

 	plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);

 	if (!plat_device_is_coherent(dev))
 		addr = CAC_ADDR(addr);

 	free_pages(addr, get_order(size));
 }

 static inline void __dma_sync(unsigned long addr, size_t size,
 	enum dma_data_direction direction)
 {
 	switch (direction) {
 	case DMA_TO_DEVICE:
 		dma_cache_wback(addr, size);
 		break;

 	case DMA_FROM_DEVICE:
 		dma_cache_inv(addr, size);
 		break;

 	case DMA_BIDIRECTIONAL:
 		dma_cache_wback_inv(addr, size);
 		break;

 	default:
 		BUG();
 	}
 }

 static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
 	size_t size, enum dma_data_direction direction, struct dma_attrs *attrs)
 {
 	if (cpu_is_noncoherent_r10000(dev))
 		__dma_sync(dma_addr_to_virt(dev, dma_addr), size,
 		           direction);

 	plat_unmap_dma_mem(dev, dma_addr, size, direction);
 }

 static int mips_dma_map_sg(struct device *dev, struct scatterlist *sg,
 	int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
 {
 	int i;

 	for (i = 0; i < nents; i++, sg++) {
 		unsigned long addr;

 		addr = (unsigned long) sg_virt(sg);
 		if (!plat_device_is_coherent(dev) && addr)
 			__dma_sync(addr, sg->length, direction);
 		sg->dma_address = plat_map_dma_mem(dev,
 				                   (void *)addr, sg->length);
 	}

 	return nents;
 }

 static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page,
 	unsigned long offset, size_t size, enum dma_data_direction direction,
 	struct dma_attrs *attrs)
 {
 	unsigned long addr;

 	addr = (unsigned long) page_address(page) + offset;

 	if (!plat_device_is_coherent(dev))
 		__dma_sync(addr, size, direction);

 	return plat_map_dma_mem(dev, (void *)addr, size);
 }

 static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 	int nhwentries, enum dma_data_direction direction,
 	struct dma_attrs *attrs)
 {
 	unsigned long addr;
 	int i;

 	for (i = 0; i < nhwentries; i++, sg++) {
 		if (!plat_device_is_coherent(dev) &&
 		    direction != DMA_TO_DEVICE) {
 			addr = (unsigned long) sg_virt(sg);
 			if (addr)
 				__dma_sync(addr, sg->length, direction);
 		}
 		plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
 	}
 }

 static void mips_dma_sync_single_for_cpu(struct device *dev,
 	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 {
 	if (cpu_is_noncoherent_r10000(dev)) {
 		unsigned long addr;

 		addr = dma_addr_to_virt(dev, dma_handle);
 		__dma_sync(addr, size, direction);
 	}
 }

 static void mips_dma_sync_single_for_device(struct device *dev,
 	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 {
 	plat_extra_sync_for_device(dev);
 	if (!plat_device_is_coherent(dev)) {
 		unsigned long addr;

 		addr = dma_addr_to_virt(dev, dma_handle);
 		__dma_sync(addr, size, direction);
 	}
 }

 static void mips_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 (i = 0; i < nelems; i++, sg++) {
 		if (cpu_is_noncoherent_r10000(dev))
 			__dma_sync((unsigned long)page_address(sg_page(sg)),
 			           sg->length, direction);
 	}
 }

 static void mips_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 (i = 0; i < nelems; i++, sg++) {
 		if (!plat_device_is_coherent(dev))
 			__dma_sync((unsigned long)page_address(sg_page(sg)),
 			           sg->length, direction);
 	}
 }

 int mips_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
 	return plat_dma_mapping_error(dev, dma_addr);
 }

 int mips_dma_supported(struct device *dev, u64 mask)
 {
 	return plat_dma_supported(dev, mask);
 }

 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 			 enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	plat_extra_sync_for_device(dev);
 	if (!plat_device_is_coherent(dev))
 		__dma_sync((unsigned long)vaddr, size, direction);
 }

 EXPORT_SYMBOL(dma_cache_sync);

 static struct dma_map_ops mips_default_dma_map_ops = {
 	.alloc_coherent = mips_dma_alloc_coherent,
 	.free_coherent = mips_dma_free_coherent,
 	.map_page = mips_dma_map_page,
 	.unmap_page = mips_dma_unmap_page,
 	.map_sg = mips_dma_map_sg,
 	.unmap_sg = mips_dma_unmap_sg,
 	.sync_single_for_cpu = mips_dma_sync_single_for_cpu,
 	.sync_single_for_device = mips_dma_sync_single_for_device,
 	.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
 	.sync_sg_for_device = mips_dma_sync_sg_for_device,
 	.mapping_error = mips_dma_mapping_error,
 	.dma_supported = mips_dma_supported
 };

 struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
 EXPORT_SYMBOL(mips_dma_map_ops);

 #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)

 static int __init mips_dma_init(void)
 {
 	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);

 	return 0;
 }
 fs_initcall(mips_dma_init);
	/*
	* 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) 2000 Ani Joshi <ajoshi@unixbox.com>
	* Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
	* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
	*/

	#include <linux/types.h>
	#include <linux/dma-mapping.h>
	#include <linux/mm.h>
	#include <linux/module.h>
	#include <linux/scatterlist.h>
	#include <linux/string.h>
	#include <linux/gfp.h>

	#include <asm/cache.h>
	#include <asm/io.h>

	#include <dma-coherence.h>

	static inline unsigned long dma_addr_to_virt(struct device *dev,
	dma_addr_t dma_addr)
	{
	unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);

	return (unsigned long)phys_to_virt(addr);
	}

	/*
	* Warning on the terminology - Linux calls an uncached area coherent;
	* MIPS terminology calls memory areas with hardware maintained coherency
	* coherent.
	*/

	static inline int cpu_is_noncoherent_r10000(struct device *dev)
	{
	return !plat_device_is_coherent(dev) &&
	(current_cpu_type() == CPU_R10000 \|\|
	current_cpu_type() == CPU_R12000);
	}

	static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
	{
	gfp_t dma_flag;

	/* ignore region specifiers */
	gfp &= ~(__GFP_DMA \| __GFP_DMA32 \| __GFP_HIGHMEM);

	#ifdef CONFIG_ISA
	if (dev == NULL)
	dma_flag = __GFP_DMA;
	else
	#endif
	#if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
	if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
	dma_flag = __GFP_DMA;
	else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
	dma_flag = __GFP_DMA32;
	else
	#endif
	#if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
	if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
	dma_flag = __GFP_DMA32;
	else
	#endif
	#if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
	if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
	dma_flag = __GFP_DMA;
	else
	#endif
	dma_flag = 0;

	/* Don't invoke OOM killer */
	gfp \|= __GFP_NORETRY;

	return gfp \| dma_flag;
	}

	void dma_alloc_noncoherent(struct device dev, size_t size,
	dma_addr_t * dma_handle, gfp_t gfp)
	{
	void *ret;

	gfp = massage_gfp_flags(dev, gfp);

	ret = (void *) __get_free_pages(gfp, get_order(size));

	if (ret != NULL) {
	memset(ret, 0, size);
	*dma_handle = plat_map_dma_mem(dev, ret, size);
	}

	return ret;
	}
	EXPORT_SYMBOL(dma_alloc_noncoherent);

	static void mips_dma_alloc_coherent(struct device dev, size_t size,
	dma_addr_t * dma_handle, gfp_t gfp)
	{
	void *ret;

	if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
	return ret;

	gfp = massage_gfp_flags(dev, gfp);

	ret = (void *) __get_free_pages(gfp, get_order(size));

	if (ret) {
	memset(ret, 0, size);
	*dma_handle = plat_map_dma_mem(dev, ret, size);

	if (!plat_device_is_coherent(dev)) {
	dma_cache_wback_inv((unsigned long) ret, size);
	ret = UNCAC_ADDR(ret);
	}
	}

	return ret;
	}


	void dma_free_noncoherent(struct device dev, size_t size, void vaddr,
	dma_addr_t dma_handle)
	{
	plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
	free_pages((unsigned long) vaddr, get_order(size));
	}
	EXPORT_SYMBOL(dma_free_noncoherent);

	static void mips_dma_free_coherent(struct device dev, size_t size, void vaddr,
	dma_addr_t dma_handle)
	{
	unsigned long addr = (unsigned long) vaddr;
	int order = get_order(size);

	if (dma_release_from_coherent(dev, order, vaddr))
	return;

	plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);

	if (!plat_device_is_coherent(dev))
	addr = CAC_ADDR(addr);

	free_pages(addr, get_order(size));
	}

	static inline void __dma_sync(unsigned long addr, size_t size,
	enum dma_data_direction direction)
	{
	switch (direction) {
	case DMA_TO_DEVICE:
	dma_cache_wback(addr, size);
	break;

	case DMA_FROM_DEVICE:
	dma_cache_inv(addr, size);
	break;

	case DMA_BIDIRECTIONAL:
	dma_cache_wback_inv(addr, size);
	break;

	default:
	BUG();
	}
	}

	static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
	size_t size, enum dma_data_direction direction, struct dma_attrs *attrs)
	{
	if (cpu_is_noncoherent_r10000(dev))
	__dma_sync(dma_addr_to_virt(dev, dma_addr), size,
	direction);

	plat_unmap_dma_mem(dev, dma_addr, size, direction);
	}

	static int mips_dma_map_sg(struct device dev, struct scatterlist sg,
	int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
	{
	int i;

	for (i = 0; i < nents; i++, sg++) {
	unsigned long addr;

	addr = (unsigned long) sg_virt(sg);
	if (!plat_device_is_coherent(dev) && addr)
	__dma_sync(addr, sg->length, direction);
	sg->dma_address = plat_map_dma_mem(dev,
	(void *)addr, sg->length);
	}

	return nents;
	}

	static dma_addr_t mips_dma_map_page(struct device dev, struct page page,
	unsigned long offset, size_t size, enum dma_data_direction direction,
	struct dma_attrs *attrs)
	{
	unsigned long addr;

	addr = (unsigned long) page_address(page) + offset;

	if (!plat_device_is_coherent(dev))
	__dma_sync(addr, size, direction);

	return plat_map_dma_mem(dev, (void *)addr, size);
	}

	static void mips_dma_unmap_sg(struct device dev, struct scatterlist sg,
	int nhwentries, enum dma_data_direction direction,
	struct dma_attrs *attrs)
	{
	unsigned long addr;
	int i;

	for (i = 0; i < nhwentries; i++, sg++) {
	if (!plat_device_is_coherent(dev) &&
	direction != DMA_TO_DEVICE) {
	addr = (unsigned long) sg_virt(sg);
	if (addr)
	__dma_sync(addr, sg->length, direction);
	}
	plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
	}
	}

	static void mips_dma_sync_single_for_cpu(struct device *dev,
	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
	{
	if (cpu_is_noncoherent_r10000(dev)) {
	unsigned long addr;

	addr = dma_addr_to_virt(dev, dma_handle);
	__dma_sync(addr, size, direction);
	}
	}

	static void mips_dma_sync_single_for_device(struct device *dev,
	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
	{
	plat_extra_sync_for_device(dev);
	if (!plat_device_is_coherent(dev)) {
	unsigned long addr;

	addr = dma_addr_to_virt(dev, dma_handle);
	__dma_sync(addr, size, direction);
	}
	}

	static void mips_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 (i = 0; i < nelems; i++, sg++) {
	if (cpu_is_noncoherent_r10000(dev))
	__dma_sync((unsigned long)page_address(sg_page(sg)),
	sg->length, direction);
	}
	}

	static void mips_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 (i = 0; i < nelems; i++, sg++) {
	if (!plat_device_is_coherent(dev))
	__dma_sync((unsigned long)page_address(sg_page(sg)),
	sg->length, direction);
	}
	}

	int mips_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
	{
	return plat_dma_mapping_error(dev, dma_addr);
	}

	int mips_dma_supported(struct device *dev, u64 mask)
	{
	return plat_dma_supported(dev, mask);
	}

	void dma_cache_sync(struct device dev, void vaddr, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	plat_extra_sync_for_device(dev);
	if (!plat_device_is_coherent(dev))
	__dma_sync((unsigned long)vaddr, size, direction);
	}

	EXPORT_SYMBOL(dma_cache_sync);

	static struct dma_map_ops mips_default_dma_map_ops = {
	.alloc_coherent = mips_dma_alloc_coherent,
	.free_coherent = mips_dma_free_coherent,
	.map_page = mips_dma_map_page,
	.unmap_page = mips_dma_unmap_page,
	.map_sg = mips_dma_map_sg,
	.unmap_sg = mips_dma_unmap_sg,
	.sync_single_for_cpu = mips_dma_sync_single_for_cpu,
	.sync_single_for_device = mips_dma_sync_single_for_device,
	.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
	.sync_sg_for_device = mips_dma_sync_sg_for_device,
	.mapping_error = mips_dma_mapping_error,
	.dma_supported = mips_dma_supported
	};

	struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
	EXPORT_SYMBOL(mips_dma_map_ops);

	#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)

	static int __init mips_dma_init(void)
	{
	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);

	return 0;
	}
	fs_initcall(mips_dma_init);