arch/mips/mm/dma-noncoherent.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  Ralf Baechle <ralf@gnu.org>
  * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
  */
 #include <linux/config.h>
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/dma-mapping.h>

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

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

 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 = virt_to_phys(ret);
 	}

 	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;

 	ret = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
 	if (ret) {
 		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;

 	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;

 	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();
 	}

 	return virt_to_phys(ptr);
 }

 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)
 {
 	unsigned long addr;
 	addr = dma_addr + PAGE_OFFSET;

 	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();
 	}
 }

 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 (addr)
 			__dma_sync(addr + sg->offset, sg->length, direction);
 		sg->dma_address = (dma_addr_t)
 			(page_to_phys(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)
 {
 	unsigned long addr;

 	BUG_ON(direction == DMA_NONE);

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

 	return page_to_phys(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 (direction != DMA_TO_DEVICE) {
 		unsigned long addr;

 		addr = dma_address + PAGE_OFFSET;
 		dma_cache_wback_inv(addr, size);
 	}
 }

 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);

 	if (direction == DMA_TO_DEVICE)
 		return;

 	for (i = 0; i < nhwentries; i++, sg++) {
 		addr = (unsigned long) page_address(sg->page);
 		if (!addr)
 			continue;
 		dma_cache_wback_inv(addr + sg->offset, sg->length);
 	}
 }

 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)
 {
 	unsigned long addr;

 	BUG_ON(direction == DMA_NONE);

 	addr = dma_handle + PAGE_OFFSET;
 	__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)
 {
 	unsigned long addr;

 	BUG_ON(direction == DMA_NONE);

 	addr = dma_handle + PAGE_OFFSET;
 	__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)
 {
 	unsigned long addr;

 	BUG_ON(direction == DMA_NONE);

 	addr = dma_handle + offset + PAGE_OFFSET;
 	__dma_sync(addr, 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)
 {
 	unsigned long addr;

 	BUG_ON(direction == DMA_NONE);

 	addr = dma_handle + offset + PAGE_OFFSET;
 	__dma_sync(addr, 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++)
 		__dma_sync((unsigned long)page_address(sg->page),
 		           sg->length, direction);
 }

 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++)
 		__dma_sync((unsigned long)page_address(sg->page),
 		           sg->length, direction);
 }

 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(dma_addr_t dma_addr)
 {
 	return 1;
 }

 EXPORT_SYMBOL(dma_is_consistent);

 void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction)
 {
 	if (direction == DMA_NONE)
 		return;

 	dma_cache_wback_inv((unsigned long)vaddr, size);
 }

 EXPORT_SYMBOL(dma_cache_sync);

 /* The DAC routines are a PCIism.. */

 #ifdef CONFIG_PCI

 #include <linux/pci.h>

 dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
 	struct page *page, unsigned long offset, int direction)
 {
 	return (dma64_addr_t)page_to_phys(page) + offset;
 }

 EXPORT_SYMBOL(pci_dac_page_to_dma);

 struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
 	dma64_addr_t dma_addr)
 {
 	return mem_map + (dma_addr >> PAGE_SHIFT);
 }

 EXPORT_SYMBOL(pci_dac_dma_to_page);

 unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
 	dma64_addr_t dma_addr)
 {
 	return dma_addr & ~PAGE_MASK;
 }

 EXPORT_SYMBOL(pci_dac_dma_to_offset);

 void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
 	dma64_addr_t dma_addr, size_t len, int direction)
 {
 	BUG_ON(direction == PCI_DMA_NONE);

 	dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
 }

 EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);

 void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
 	dma64_addr_t dma_addr, size_t len, int direction)
 {
 	BUG_ON(direction == PCI_DMA_NONE);

 	dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
 }

 EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);

 #endif /* CONFIG_PCI */
	/*
	* 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 Ralf Baechle <ralf@gnu.org>
	* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
	*/
	#include <linux/config.h>
	#include <linux/types.h>
	#include <linux/mm.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/dma-mapping.h>

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

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

	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 = virt_to_phys(ret);
	}

	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;

	ret = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
	if (ret) {
	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;

	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;

	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();
	}

	return virt_to_phys(ptr);
	}

	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)
	{
	unsigned long addr;
	addr = dma_addr + PAGE_OFFSET;

	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();
	}
	}

	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 (addr)
	__dma_sync(addr + sg->offset, sg->length, direction);
	sg->dma_address = (dma_addr_t)
	(page_to_phys(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)
	{
	unsigned long addr;

	BUG_ON(direction == DMA_NONE);

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

	return page_to_phys(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 (direction != DMA_TO_DEVICE) {
	unsigned long addr;

	addr = dma_address + PAGE_OFFSET;
	dma_cache_wback_inv(addr, size);
	}
	}

	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);

	if (direction == DMA_TO_DEVICE)
	return;

	for (i = 0; i < nhwentries; i++, sg++) {
	addr = (unsigned long) page_address(sg->page);
	if (!addr)
	continue;
	dma_cache_wback_inv(addr + sg->offset, sg->length);
	}
	}

	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)
	{
	unsigned long addr;

	BUG_ON(direction == DMA_NONE);

	addr = dma_handle + PAGE_OFFSET;
	__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)
	{
	unsigned long addr;

	BUG_ON(direction == DMA_NONE);

	addr = dma_handle + PAGE_OFFSET;
	__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)
	{
	unsigned long addr;

	BUG_ON(direction == DMA_NONE);

	addr = dma_handle + offset + PAGE_OFFSET;
	__dma_sync(addr, 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)
	{
	unsigned long addr;

	BUG_ON(direction == DMA_NONE);

	addr = dma_handle + offset + PAGE_OFFSET;
	__dma_sync(addr, 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++)
	__dma_sync((unsigned long)page_address(sg->page),
	sg->length, direction);
	}

	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++)
	__dma_sync((unsigned long)page_address(sg->page),
	sg->length, direction);
	}

	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(dma_addr_t dma_addr)
	{
	return 1;
	}

	EXPORT_SYMBOL(dma_is_consistent);

	void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction)
	{
	if (direction == DMA_NONE)
	return;

	dma_cache_wback_inv((unsigned long)vaddr, size);
	}

	EXPORT_SYMBOL(dma_cache_sync);

	/* The DAC routines are a PCIism.. */

	#ifdef CONFIG_PCI

	#include <linux/pci.h>

	dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
	struct page *page, unsigned long offset, int direction)
	{
	return (dma64_addr_t)page_to_phys(page) + offset;
	}

	EXPORT_SYMBOL(pci_dac_page_to_dma);

	struct page pci_dac_dma_to_page(struct pci_dev pdev,
	dma64_addr_t dma_addr)
	{
	return mem_map + (dma_addr >> PAGE_SHIFT);
	}

	EXPORT_SYMBOL(pci_dac_dma_to_page);

	unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
	dma64_addr_t dma_addr)
	{
	return dma_addr & ~PAGE_MASK;
	}

	EXPORT_SYMBOL(pci_dac_dma_to_offset);

	void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
	dma64_addr_t dma_addr, size_t len, int direction)
	{
	BUG_ON(direction == PCI_DMA_NONE);

	dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
	}

	EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);

	void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
	dma64_addr_t dma_addr, size_t len, int direction)
	{
	BUG_ON(direction == PCI_DMA_NONE);

	dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
	}

	EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);

	#endif /* CONFIG_PCI */