1/* DMA mapping routines for the MN10300 arch
  2 *
  3 * Copyright (C) 2007 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 Licence
  8 * as published by the Free Software Foundation; either version
  9 * 2 of the Licence, or (at your option) any later version.
 10 */
 11#ifndef _ASM_DMA_MAPPING_H
 12#define _ASM_DMA_MAPPING_H
 13
 14#include <linux/mm.h>
 15#include <linux/scatterlist.h>
 16
 17#include <asm/cache.h>
 18#include <asm/io.h>
 19
 20/*
 21 * See Documentation/DMA-API.txt for the description of how the
 22 * following DMA API should work.
 23 */
 24
 25extern void *dma_alloc_coherent(struct device *dev, size_t size,
 26				dma_addr_t *dma_handle, int flag);
 27
 28extern void dma_free_coherent(struct device *dev, size_t size,
 29			      void *vaddr, dma_addr_t dma_handle);
 30
 31#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent((d), (s), (h), (f))
 32#define dma_free_noncoherent(d, s, v, h)  dma_free_coherent((d), (s), (v), (h))
 33
 34static inline
 35dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 36			  enum dma_data_direction direction)
 37{
 38	BUG_ON(direction == DMA_NONE);
 39	mn10300_dcache_flush_inv();
 40	return virt_to_bus(ptr);
 41}
 42
 43static inline
 44void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 45		      enum dma_data_direction direction)
 46{
 47	BUG_ON(direction == DMA_NONE);
 48}
 49
 50static inline
 51int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
 52	       enum dma_data_direction direction)
 53{
 54	struct scatterlist *sg;
 55	int i;
 56
 57	BUG_ON(!valid_dma_direction(direction));
 58	WARN_ON(nents == 0 || sglist[0].length == 0);
 59
 60	for_each_sg(sglist, sg, nents, i) {
 61		BUG_ON(!sg_page(sg));
 62
 63		sg->dma_address = sg_phys(sg);
 64	}
 65
 66	mn10300_dcache_flush_inv();
 67	return nents;
 68}
 69
 70static inline
 71void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 72		  enum dma_data_direction direction)
 73{
 74	BUG_ON(!valid_dma_direction(direction));
 75}
 76
 77static inline
 78dma_addr_t dma_map_page(struct device *dev, struct page *page,
 79			unsigned long offset, size_t size,
 80			enum dma_data_direction direction)
 81{
 82	BUG_ON(direction == DMA_NONE);
 83	return page_to_bus(page) + offset;
 84}
 85
 86static inline
 87void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 88		    enum dma_data_direction direction)
 89{
 90	BUG_ON(direction == DMA_NONE);
 91}
 92
 93static inline
 94void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 95			     size_t size, enum dma_data_direction direction)
 96{
 97}
 98
 99static inline
100void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
101				size_t size, enum dma_data_direction direction)
102{
103	mn10300_dcache_flush_inv();
104}
105
106static inline
107void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
108				   unsigned long offset, size_t size,
109				   enum dma_data_direction direction)
110{
111}
112
113static inline void
114dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
115				 unsigned long offset, size_t size,
116				 enum dma_data_direction direction)
117{
118	mn10300_dcache_flush_inv();
119}
120
121
122static inline
123void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
124			 int nelems, enum dma_data_direction direction)
125{
126}
127
128static inline
129void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
130			    int nelems, enum dma_data_direction direction)
131{
132	mn10300_dcache_flush_inv();
133}
134
135static inline
136int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
137{
138	return 0;
139}
140
141static inline
142int dma_supported(struct device *dev, u64 mask)
143{
144	/*
145	 * we fall back to GFP_DMA when the mask isn't all 1s, so we can't
146	 * guarantee allocations that must be within a tighter range than
147	 * GFP_DMA
148	 */
149	if (mask < 0x00ffffff)
150		return 0;
151	return 1;
152}
153
154static inline
155int dma_set_mask(struct device *dev, u64 mask)
156{
157	if (!dev->dma_mask || !dma_supported(dev, mask))
158		return -EIO;
159
160	*dev->dma_mask = mask;
161	return 0;
162}
163
164static inline
165void dma_cache_sync(void *vaddr, size_t size,
166		    enum dma_data_direction direction)
167{
168	mn10300_dcache_flush_inv();
169}
170
171#endif