[deliverable/linux.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/dma-mapping.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/export.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include <asm/io.h>

static void *frv_dma_alloc(struct device *hwdev, size_t size,
		dma_addr_t *dma_handle, gfp_t gfp,
		struct dma_attrs *attrs)
{
	void *ret;

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

	return ret;
}

static void frv_dma_free(struct device *hwdev, size_t size, void *vaddr,
		dma_addr_t dma_handle, struct dma_attrs *attrs)
{
	consistent_free(vaddr);
}

static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist,
		int nents, enum dma_data_direction direction,
		struct dma_attrs *attrs)
{
	unsigned long dampr2;
	void *vaddr;
	int i;
	struct scatterlist *sg;

	BUG_ON(direction == DMA_NONE);

	dampr2 = __get_DAMPR(2);

	for_each_sg(sglist, sg, nents, i) {
		vaddr = kmap_atomic_primary(sg_page(sg));

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

	}

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

	return nents;
}

static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page,
		unsigned long offset, size_t size,
		enum dma_data_direction direction, struct dma_attrs *attrs)
{
	flush_dcache_page(page);
	return (dma_addr_t) page_to_phys(page) + offset;
}

static void frv_dma_sync_single_for_device(struct device *dev,
		dma_addr_t dma_handle, size_t size,
		enum dma_data_direction direction)
{
	flush_write_buffers();
}

static void frv_dma_sync_sg_for_device(struct device *dev,
		struct scatterlist *sg, int nelems,
		enum dma_data_direction direction)
{
	flush_write_buffers();
}


static int frv_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;
}

struct dma_map_ops frv_dma_ops = {
	.alloc			= frv_dma_alloc,
	.free			= frv_dma_free,
	.map_page		= frv_dma_map_page,
	.map_sg			= frv_dma_map_sg,
	.sync_single_for_device	= frv_dma_sync_single_for_device,
	.sync_sg_for_device	= frv_dma_sync_sg_for_device,
	.dma_supported		= frv_dma_supported,
};
EXPORT_SYMBOL(frv_dma_ops);
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>
1da177e4 LT	13	#include <linux/dma-mapping.h>
	14	#include <linux/list.h>
	15	#include <linux/pci.h>
9a78da11	16	#include <linux/export.h>
1da177e4	17	#include <linux/highmem.h>
9e6a76b8	18	#include <linux/scatterlist.h>
1da177e4 LT	19	#include <asm/io.h>
1da177e4 LT	20
eae07519 CH	21	static void frv_dma_alloc(struct device hwdev, size_t size,
	22	dma_addr_t *dma_handle, gfp_t gfp,
	23	struct dma_attrs *attrs)
1da177e4 LT	24	{
	25	void *ret;
	26
	27	ret = consistent_alloc(gfp, size, dma_handle);
	28	if (ret)
	29	memset(ret, 0, size);
	30
	31	return ret;
	32	}
	33
eae07519 CH	34	static void frv_dma_free(struct device hwdev, size_t size, void vaddr,
eae07519 CH	35	dma_addr_t dma_handle, struct dma_attrs *attrs)
1da177e4 LT	36	{
	37	consistent_free(vaddr);
	38	}
	39
eae07519 CH	40	static int frv_dma_map_sg(struct device dev, struct scatterlist sglist,
	41	int nents, enum dma_data_direction direction,
	42	struct dma_attrs *attrs)
1da177e4 LT	43	{
	44	unsigned long dampr2;
	45	void *vaddr;
	46	int i;
0989e1f9	47	struct scatterlist *sg;
1da177e4	48
db5c444e	49	BUG_ON(direction == DMA_NONE);
1da177e4 LT	50
	51	dampr2 = __get_DAMPR(2);
	52
0989e1f9 AM	53	for_each_sg(sglist, sg, nents, i) {
0989e1f9 AM	54	vaddr = kmap_atomic_primary(sg_page(sg));
1da177e4 LT	55
	56	frv_dcache_writeback((unsigned long) vaddr,
	57	(unsigned long) vaddr + PAGE_SIZE);
	58
	59	}
	60
144cf864	61	kunmap_atomic_primary(vaddr);
1da177e4 LT	62	if (dampr2) {
	63	__set_DAMPR(2, dampr2);
	64	__set_IAMPR(2, dampr2);
	65	}
	66
	67	return nents;
	68	}
	69
eae07519 CH	70	static dma_addr_t frv_dma_map_page(struct device dev, struct page page,
	71	unsigned long offset, size_t size,
	72	enum dma_data_direction direction, struct dma_attrs *attrs)
1da177e4	73	{
1da177e4 LT	74	flush_dcache_page(page);
	75	return (dma_addr_t) page_to_phys(page) + offset;
	76	}
40234401	77
eae07519 CH	78	static void frv_dma_sync_single_for_device(struct device *dev,
	79	dma_addr_t dma_handle, size_t size,
	80	enum dma_data_direction direction)
	81	{
	82	flush_write_buffers();
	83	}
	84
	85	static void frv_dma_sync_sg_for_device(struct device *dev,
	86	struct scatterlist *sg, int nelems,
	87	enum dma_data_direction direction)
	88	{
	89	flush_write_buffers();
	90	}
	91
	92
	93	static int frv_dma_supported(struct device *dev, u64 mask)
	94	{
	95	/*
	96	* we fall back to GFP_DMA when the mask isn't all 1s,
	97	* so we can't guarantee allocations that must be
	98	* within a tighter range than GFP_DMA..
	99	*/
	100	if (mask < 0x00ffffff)
	101	return 0;
	102	return 1;
	103	}
	104
	105	struct dma_map_ops frv_dma_ops = {
	106	.alloc = frv_dma_alloc,
	107	.free = frv_dma_free,
	108	.map_page = frv_dma_map_page,
	109	.map_sg = frv_dma_map_sg,
	110	.sync_single_for_device = frv_dma_sync_single_for_device,
	111	.sync_sg_for_device = frv_dma_sync_sg_for_device,
	112	.dma_supported = frv_dma_supported,
	113	};
	114	EXPORT_SYMBOL(frv_dma_ops);