[linux-2.6-block.git] / arch / frv / mb93090-mb00 / pci-dma.c

/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include <asm/io.h>

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

	ret = consistent_alloc(gfp, size, dma_handle);
	if (ret)
		memset(ret, 0, size);

	return ret;
}

EXPORT_SYMBOL(dma_alloc_coherent);

void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
{
	consistent_free(vaddr);
}

EXPORT_SYMBOL(dma_free_coherent);

/*
 * Map a single buffer of the indicated size for DMA in streaming mode.
 * The 32-bit bus address to use is returned.
 *
 * Once the device is given the dma address, the device owns this memory
 * until either pci_unmap_single or pci_dma_sync_single is performed.
 */
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
			  enum dma_data_direction direction)
{
	if (direction == DMA_NONE)
                BUG();

	frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);

	return virt_to_bus(ptr);
}

EXPORT_SYMBOL(dma_map_single);

/*
 * Map a set of buffers described by scatterlist in streaming
 * mode for DMA.  This is the scather-gather version of the
 * above dma_map_single interface.  Here the scatter gather list
 * elements are each tagged with the appropriate dma address
 * and length.  They are obtained via sg_dma_{address,length}(SG).
 *
 * NOTE: An implementation may be able to use a smaller number of
 *       DMA address/length pairs than there are SG table elements.
 *       (for example via virtual mapping capabilities)
 *       The routine returns the number of addr/length pairs actually
 *       used, at most nents.
 *
 * Device ownership issues as mentioned above for dma_map_single are
 * the same here.
 */
int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
	       enum dma_data_direction direction)
{
	unsigned long dampr2;
	void *vaddr;
	int i;

	if (direction == DMA_NONE)
                BUG();

	dampr2 = __get_DAMPR(2);

	for (i = 0; i < nents; i++) {
		vaddr = kmap_atomic(sg_page(&sg[i]), __KM_CACHE);

		frv_dcache_writeback((unsigned long) vaddr,
				     (unsigned long) vaddr + PAGE_SIZE);

	}

	kunmap_atomic(vaddr, __KM_CACHE);
	if (dampr2) {
		__set_DAMPR(2, dampr2);
		__set_IAMPR(2, dampr2);
	}

	return nents;
}

EXPORT_SYMBOL(dma_map_sg);

/*
 * Map a single page of the indicated size for DMA in streaming mode.
 * The 32-bit bus address to use is returned.
 *
 * Device ownership issues as mentioned above for dma_map_single are
 * the same here.
 */
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);
	flush_dcache_page(page);
	return (dma_addr_t) page_to_phys(page) + offset;
}

EXPORT_SYMBOL(dma_map_page);
Commit	Line	Data
1da177e4 LT	1	/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
	2	*
	3	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/types.h>
	13	#include <linux/slab.h>
	14	#include <linux/dma-mapping.h>
	15	#include <linux/list.h>
	16	#include <linux/pci.h>
	17	#include <linux/highmem.h>
9e6a76b8	18	#include <linux/scatterlist.h>
1da177e4 LT	19	#include <asm/io.h>
1da177e4 LT	20
a5da7d3c	21	void dma_alloc_coherent(struct device hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
1da177e4 LT	22	{
	23	void *ret;
	24
	25	ret = consistent_alloc(gfp, size, dma_handle);
	26	if (ret)
	27	memset(ret, 0, size);
	28
	29	return ret;
	30	}
	31
40234401 DH	32	EXPORT_SYMBOL(dma_alloc_coherent);
40234401 DH	33
1da177e4 LT	34	void dma_free_coherent(struct device hwdev, size_t size, void vaddr, dma_addr_t dma_handle)
	35	{
	36	consistent_free(vaddr);
	37	}
	38
40234401 DH	39	EXPORT_SYMBOL(dma_free_coherent);
40234401 DH	40
1da177e4 LT	41	/*
	42	* Map a single buffer of the indicated size for DMA in streaming mode.
	43	* The 32-bit bus address to use is returned.
	44	*
	45	* Once the device is given the dma address, the device owns this memory
	46	* until either pci_unmap_single or pci_dma_sync_single is performed.
	47	*/
	48	dma_addr_t dma_map_single(struct device dev, void ptr, size_t size,
	49	enum dma_data_direction direction)
	50	{
	51	if (direction == DMA_NONE)
	52	BUG();
	53
	54	frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
	55
	56	return virt_to_bus(ptr);
	57	}
	58
40234401 DH	59	EXPORT_SYMBOL(dma_map_single);
40234401 DH	60
1da177e4 LT	61	/*
	62	* Map a set of buffers described by scatterlist in streaming
	63	* mode for DMA. This is the scather-gather version of the
c9af956c	64	* above dma_map_single interface. Here the scatter gather list
1da177e4 LT	65	* elements are each tagged with the appropriate dma address
	66	* and length. They are obtained via sg_dma_{address,length}(SG).
	67	*
	68	* NOTE: An implementation may be able to use a smaller number of
	69	* DMA address/length pairs than there are SG table elements.
	70	* (for example via virtual mapping capabilities)
	71	* The routine returns the number of addr/length pairs actually
	72	* used, at most nents.
	73	*
c9af956c	74	* Device ownership issues as mentioned above for dma_map_single are
1da177e4 LT	75	* the same here.
	76	*/
	77	int dma_map_sg(struct device dev, struct scatterlist sg, int nents,
	78	enum dma_data_direction direction)
	79	{
	80	unsigned long dampr2;
	81	void *vaddr;
	82	int i;
	83
	84	if (direction == DMA_NONE)
	85	BUG();
	86
	87	dampr2 = __get_DAMPR(2);
	88
	89	for (i = 0; i < nents; i++) {
9e6a76b8	90	vaddr = kmap_atomic(sg_page(&sg[i]), __KM_CACHE);
1da177e4 LT	91
	92	frv_dcache_writeback((unsigned long) vaddr,
	93	(unsigned long) vaddr + PAGE_SIZE);
	94
	95	}
	96
	97	kunmap_atomic(vaddr, __KM_CACHE);
	98	if (dampr2) {
	99	__set_DAMPR(2, dampr2);
	100	__set_IAMPR(2, dampr2);
	101	}
	102
	103	return nents;
	104	}
	105
40234401 DH	106	EXPORT_SYMBOL(dma_map_sg);
40234401 DH	107
c9af956c DH	108	/*
	109	* Map a single page of the indicated size for DMA in streaming mode.
	110	* The 32-bit bus address to use is returned.
	111	*
	112	* Device ownership issues as mentioned above for dma_map_single are
	113	* the same here.
	114	*/
1da177e4 LT	115	dma_addr_t dma_map_page(struct device dev, struct page page, unsigned long offset,
	116	size_t size, enum dma_data_direction direction)
	117	{
	118	BUG_ON(direction == DMA_NONE);
	119	flush_dcache_page(page);
	120	return (dma_addr_t) page_to_phys(page) + offset;
	121	}
40234401 DH	122
40234401 DH	123	EXPORT_SYMBOL(dma_map_page);