[mirror_ubuntu-artful-kernel.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, unsigned long 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, unsigned long attrs)
{
	consistent_free(vaddr);
}

static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist,
		int nents, enum dma_data_direction direction,
		unsigned long 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, unsigned long 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	21	static void frv_dma_alloc(struct device hwdev, size_t size,
00085f1e	22	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
1da177e4 LT	23	{
	24	void *ret;
	25
	26	ret = consistent_alloc(gfp, size, dma_handle);
	27	if (ret)
	28	memset(ret, 0, size);
	29
	30	return ret;
	31	}
	32
eae07519	33	static void frv_dma_free(struct device hwdev, size_t size, void vaddr,
00085f1e	34	dma_addr_t dma_handle, unsigned long attrs)
1da177e4 LT	35	{
	36	consistent_free(vaddr);
	37	}
	38
eae07519 CH	39	static int frv_dma_map_sg(struct device dev, struct scatterlist sglist,
eae07519 CH	40	int nents, enum dma_data_direction direction,
00085f1e	41	unsigned long attrs)
1da177e4 LT	42	{
	43	unsigned long dampr2;
	44	void *vaddr;
	45	int i;
0989e1f9	46	struct scatterlist *sg;
1da177e4	47
db5c444e	48	BUG_ON(direction == DMA_NONE);
1da177e4 LT	49
	50	dampr2 = __get_DAMPR(2);
	51
0989e1f9 AM	52	for_each_sg(sglist, sg, nents, i) {
0989e1f9 AM	53	vaddr = kmap_atomic_primary(sg_page(sg));
1da177e4 LT	54
	55	frv_dcache_writeback((unsigned long) vaddr,
	56	(unsigned long) vaddr + PAGE_SIZE);
	57
	58	}
	59
144cf864	60	kunmap_atomic_primary(vaddr);
1da177e4 LT	61	if (dampr2) {
	62	__set_DAMPR(2, dampr2);
	63	__set_IAMPR(2, dampr2);
	64	}
	65
	66	return nents;
	67	}
	68
eae07519 CH	69	static dma_addr_t frv_dma_map_page(struct device dev, struct page page,
eae07519 CH	70	unsigned long offset, size_t size,
00085f1e	71	enum dma_data_direction direction, unsigned long attrs)
1da177e4	72	{
1da177e4 LT	73	flush_dcache_page(page);
	74	return (dma_addr_t) page_to_phys(page) + offset;
	75	}
40234401	76
eae07519 CH	77	static void frv_dma_sync_single_for_device(struct device *dev,
	78	dma_addr_t dma_handle, size_t size,
	79	enum dma_data_direction direction)
	80	{
	81	flush_write_buffers();
	82	}
	83
	84	static void frv_dma_sync_sg_for_device(struct device *dev,
	85	struct scatterlist *sg, int nelems,
	86	enum dma_data_direction direction)
	87	{
	88	flush_write_buffers();
	89	}
	90
	91
	92	static int frv_dma_supported(struct device *dev, u64 mask)
	93	{
	94	/*
	95	* we fall back to GFP_DMA when the mask isn't all 1s,
	96	* so we can't guarantee allocations that must be
	97	* within a tighter range than GFP_DMA..
	98	*/
	99	if (mask < 0x00ffffff)
	100	return 0;
	101	return 1;
	102	}
	103
	104	struct dma_map_ops frv_dma_ops = {
	105	.alloc = frv_dma_alloc,
	106	.free = frv_dma_free,
	107	.map_page = frv_dma_map_page,
	108	.map_sg = frv_dma_map_sg,
	109	.sync_single_for_device = frv_dma_sync_single_for_device,
	110	.sync_sg_for_device = frv_dma_sync_sg_for_device,
	111	.dma_supported = frv_dma_supported,
	112	};
	113	EXPORT_SYMBOL(frv_dma_ops);