arch/mips/mm/dma-default.c - maze/linux - Git at Google

 /*
  * 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/string.h>

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

 #include <dma-coherence.h>

 static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
 {
 	unsigned long addr = plat_dma_addr_to_phys(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_data.cputype == CPU_R10000 &&
 	       current_cpu_data.cputype == CPU_R12000);
 }

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

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

 	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
 		gfp |= GFP_DMA;
 	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);

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

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

 	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
 		gfp |= GFP_DMA;
 	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;
 }

 EXPORT_SYMBOL(dma_alloc_coherent);

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

 EXPORT_SYMBOL(dma_free_noncoherent);

 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 	dma_addr_t dma_handle)
 {
 	unsigned long addr = (unsigned long) vaddr;

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

 	free_pages(addr, get_order(size));
 }

 EXPORT_SYMBOL(dma_free_coherent);

 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();
 	}
 }

 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 	enum dma_data_direction direction)
 {
 	unsigned long addr = (unsigned long) ptr;

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

 	return plat_map_dma_mem(dev, ptr, size);
 }

 EXPORT_SYMBOL(dma_map_single);

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

 	plat_unmap_dma_mem(dma_addr);
 }

 EXPORT_SYMBOL(dma_unmap_single);

 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 	enum dma_data_direction direction)
 {
 	int i;

 	BUG_ON(direction == DMA_NONE);

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

 		addr = (unsigned long) page_address(sg->page);
 		if (!plat_device_is_coherent(dev) && addr)
 			__dma_sync(addr + sg->offset, sg->length, direction);
 		sg->dma_address = plat_map_dma_mem_page(dev, sg->page) +
 		                  sg->offset;
 	}

 	return nents;
 }

 EXPORT_SYMBOL(dma_map_sg);

 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 	unsigned long offset, size_t size, enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	if (!plat_device_is_coherent(dev)) {
 		unsigned long addr;

 		addr = (unsigned long) page_address(page) + offset;
 		dma_cache_wback_inv(addr, size);
 	}

 	return plat_map_dma_mem_page(dev, page) + offset;
 }

 EXPORT_SYMBOL(dma_map_page);

 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 	enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
 		unsigned long addr;

 		addr = plat_dma_addr_to_phys(dma_address);
 		dma_cache_wback_inv(addr, size);
 	}

 	plat_unmap_dma_mem(dma_address);
 }

 EXPORT_SYMBOL(dma_unmap_page);

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

 	BUG_ON(direction == DMA_NONE);

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

 EXPORT_SYMBOL(dma_unmap_sg);

 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 	size_t size, enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	if (cpu_is_noncoherent_r10000(dev)) {
 		unsigned long addr;

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

 EXPORT_SYMBOL(dma_sync_single_for_cpu);

 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 	size_t size, enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	if (!plat_device_is_coherent(dev)) {
 		unsigned long addr;

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

 EXPORT_SYMBOL(dma_sync_single_for_device);

 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 	unsigned long offset, size_t size, enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	if (cpu_is_noncoherent_r10000(dev)) {
 		unsigned long addr;

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

 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);

 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 	unsigned long offset, size_t size, enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	if (!plat_device_is_coherent(dev)) {
 		unsigned long addr;

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

 EXPORT_SYMBOL(dma_sync_single_range_for_device);

 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 	enum dma_data_direction direction)
 {
 	int i;

 	BUG_ON(direction == DMA_NONE);

 	/* 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->length, direction);
 		plat_unmap_dma_mem(sg->dma_address);
 	}
 }

 EXPORT_SYMBOL(dma_sync_sg_for_cpu);

 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 	enum dma_data_direction direction)
 {
 	int i;

 	BUG_ON(direction == DMA_NONE);

 	/* 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->length, direction);
 		plat_unmap_dma_mem(sg->dma_address);
 	}
 }

 EXPORT_SYMBOL(dma_sync_sg_for_device);

 int dma_mapping_error(dma_addr_t dma_addr)
 {
 	return 0;
 }

 EXPORT_SYMBOL(dma_mapping_error);

 int dma_supported(struct device *dev, u64 mask)
 {
 	/*
 	 * we fall back to GFP_DMA when the mask isn't all 1s,
 	 * so we can't guarantee allocations that must be
 	 * within a tighter range than GFP_DMA..
 	 */
 	if (mask < 0x00ffffff)
 		return 0;

 	return 1;
 }

 EXPORT_SYMBOL(dma_supported);

 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 {
 	return plat_device_is_coherent(dev);
 }

 EXPORT_SYMBOL(dma_is_consistent);

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

 	if (!plat_device_is_coherent(dev))
 		dma_cache_wback_inv((unsigned long)vaddr, size);
 }

 EXPORT_SYMBOL(dma_cache_sync);
	/*
	* 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/string.h>

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

	#include <dma-coherence.h>

	static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
	{
	unsigned long addr = plat_dma_addr_to_phys(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_data.cputype == CPU_R10000 &&
	current_cpu_data.cputype == CPU_R12000);
	}

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

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

	if (dev == NULL \|\| (dev->coherent_dma_mask < 0xffffffff))
	gfp \|= GFP_DMA;
	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);

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

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

	if (dev == NULL \|\| (dev->coherent_dma_mask < 0xffffffff))
	gfp \|= GFP_DMA;
	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;
	}

	EXPORT_SYMBOL(dma_alloc_coherent);

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

	EXPORT_SYMBOL(dma_free_noncoherent);

	void dma_free_coherent(struct device dev, size_t size, void vaddr,
	dma_addr_t dma_handle)
	{
	unsigned long addr = (unsigned long) vaddr;

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

	free_pages(addr, get_order(size));
	}

	EXPORT_SYMBOL(dma_free_coherent);

	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();
	}
	}

	dma_addr_t dma_map_single(struct device dev, void ptr, size_t size,
	enum dma_data_direction direction)
	{
	unsigned long addr = (unsigned long) ptr;

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

	return plat_map_dma_mem(dev, ptr, size);
	}

	EXPORT_SYMBOL(dma_map_single);

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

	plat_unmap_dma_mem(dma_addr);
	}

	EXPORT_SYMBOL(dma_unmap_single);

	int dma_map_sg(struct device dev, struct scatterlist sg, int nents,
	enum dma_data_direction direction)
	{
	int i;

	BUG_ON(direction == DMA_NONE);

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

	addr = (unsigned long) page_address(sg->page);
	if (!plat_device_is_coherent(dev) && addr)
	__dma_sync(addr + sg->offset, sg->length, direction);
	sg->dma_address = plat_map_dma_mem_page(dev, sg->page) +
	sg->offset;
	}

	return nents;
	}

	EXPORT_SYMBOL(dma_map_sg);

	dma_addr_t dma_map_page(struct device dev, struct page page,
	unsigned long offset, size_t size, enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev)) {
	unsigned long addr;

	addr = (unsigned long) page_address(page) + offset;
	dma_cache_wback_inv(addr, size);
	}

	return plat_map_dma_mem_page(dev, page) + offset;
	}

	EXPORT_SYMBOL(dma_map_page);

	void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
	unsigned long addr;

	addr = plat_dma_addr_to_phys(dma_address);
	dma_cache_wback_inv(addr, size);
	}

	plat_unmap_dma_mem(dma_address);
	}

	EXPORT_SYMBOL(dma_unmap_page);

	void dma_unmap_sg(struct device dev, struct scatterlist sg, int nhwentries,
	enum dma_data_direction direction)
	{
	unsigned long addr;
	int i;

	BUG_ON(direction == DMA_NONE);

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

	EXPORT_SYMBOL(dma_unmap_sg);

	void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
	size_t size, enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	if (cpu_is_noncoherent_r10000(dev)) {
	unsigned long addr;

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

	EXPORT_SYMBOL(dma_sync_single_for_cpu);

	void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
	size_t size, enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev)) {
	unsigned long addr;

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

	EXPORT_SYMBOL(dma_sync_single_for_device);

	void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
	unsigned long offset, size_t size, enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	if (cpu_is_noncoherent_r10000(dev)) {
	unsigned long addr;

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

	EXPORT_SYMBOL(dma_sync_single_range_for_cpu);

	void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
	unsigned long offset, size_t size, enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev)) {
	unsigned long addr;

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

	EXPORT_SYMBOL(dma_sync_single_range_for_device);

	void dma_sync_sg_for_cpu(struct device dev, struct scatterlist sg, int nelems,
	enum dma_data_direction direction)
	{
	int i;

	BUG_ON(direction == DMA_NONE);

	/* 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->length, direction);
	plat_unmap_dma_mem(sg->dma_address);
	}
	}

	EXPORT_SYMBOL(dma_sync_sg_for_cpu);

	void dma_sync_sg_for_device(struct device dev, struct scatterlist sg, int nelems,
	enum dma_data_direction direction)
	{
	int i;

	BUG_ON(direction == DMA_NONE);

	/* 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->length, direction);
	plat_unmap_dma_mem(sg->dma_address);
	}
	}

	EXPORT_SYMBOL(dma_sync_sg_for_device);

	int dma_mapping_error(dma_addr_t dma_addr)
	{
	return 0;
	}

	EXPORT_SYMBOL(dma_mapping_error);

	int dma_supported(struct device *dev, u64 mask)
	{
	/*
	* we fall back to GFP_DMA when the mask isn't all 1s,
	* so we can't guarantee allocations that must be
	* within a tighter range than GFP_DMA..
	*/
	if (mask < 0x00ffffff)
	return 0;

	return 1;
	}

	EXPORT_SYMBOL(dma_supported);

	int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
	{
	return plat_device_is_coherent(dev);
	}

	EXPORT_SYMBOL(dma_is_consistent);

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

	if (!plat_device_is_coherent(dev))
	dma_cache_wback_inv((unsigned long)vaddr, size);
	}

	EXPORT_SYMBOL(dma_cache_sync);