1/*
2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2009 Wind River Systems Inc
4 *  Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
5 *
6 * Based on DMA code from MIPS.
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License.  See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13#include <linux/types.h>
14#include <linux/mm.h>
15#include <linux/export.h>
16#include <linux/string.h>
17#include <linux/scatterlist.h>
18#include <linux/dma-mapping.h>
19#include <linux/io.h>
20#include <linux/cache.h>
21#include <asm/cacheflush.h>
22
23
24void *dma_alloc_coherent(struct device *dev, size_t size,
25			    dma_addr_t *dma_handle, gfp_t gfp)
26{
27	void *ret;
28
29	/* ignore region specifiers */
30	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
31
32	/* optimized page clearing */
33	gfp |= __GFP_ZERO;
34
35	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
36		gfp |= GFP_DMA;
37
38	ret = (void *) __get_free_pages(gfp, get_order(size));
39	if (ret != NULL) {
40		*dma_handle = virt_to_phys(ret);
41		flush_dcache_range((unsigned long) ret,
42			(unsigned long) ret + size);
43		ret = UNCAC_ADDR(ret);
44	}
45
46	return ret;
47}
48EXPORT_SYMBOL(dma_alloc_coherent);
49
50void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
51			dma_addr_t dma_handle)
52{
53	unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
54
55	free_pages(addr, get_order(size));
56}
57EXPORT_SYMBOL(dma_free_coherent);
58
59int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
60		enum dma_data_direction direction)
61{
62	int i;
63
64	BUG_ON(!valid_dma_direction(direction));
65
66	for_each_sg(sg, sg, nents, i) {
67		void *addr;
68
69		addr = sg_virt(sg);
70		if (addr) {
71			__dma_sync_for_device(addr, sg->length, direction);
72			sg->dma_address = sg_phys(sg);
73		}
74	}
75
76	return nents;
77}
78EXPORT_SYMBOL(dma_map_sg);
79
80dma_addr_t dma_map_page(struct device *dev, struct page *page,
81			unsigned long offset, size_t size,
82			enum dma_data_direction direction)
83{
84	void *addr;
85
86	BUG_ON(!valid_dma_direction(direction));
87
88	addr = page_address(page) + offset;
89	__dma_sync_for_device(addr, size, direction);
90
91	return page_to_phys(page) + offset;
92}
93EXPORT_SYMBOL(dma_map_page);
94
95void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
96		    enum dma_data_direction direction)
97{
98	BUG_ON(!valid_dma_direction(direction));
99
100	__dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
101}
102EXPORT_SYMBOL(dma_unmap_page);
103
104void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
105		  enum dma_data_direction direction)
106{
107	void *addr;
108	int i;
109
110	BUG_ON(!valid_dma_direction(direction));
111
112	if (direction == DMA_TO_DEVICE)
113		return;
114
115	for_each_sg(sg, sg, nhwentries, i) {
116		addr = sg_virt(sg);
117		if (addr)
118			__dma_sync_for_cpu(addr, sg->length, direction);
119	}
120}
121EXPORT_SYMBOL(dma_unmap_sg);
122
123void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
124			     size_t size, enum dma_data_direction direction)
125{
126	BUG_ON(!valid_dma_direction(direction));
127
128	__dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
129}
130EXPORT_SYMBOL(dma_sync_single_for_cpu);
131
132void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
133				size_t size, enum dma_data_direction direction)
134{
135	BUG_ON(!valid_dma_direction(direction));
136
137	__dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
138}
139EXPORT_SYMBOL(dma_sync_single_for_device);
140
141void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
142					unsigned long offset, size_t size,
143					enum dma_data_direction direction)
144{
145	BUG_ON(!valid_dma_direction(direction));
146
147	__dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
148}
149EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
150
151void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
152					unsigned long offset, size_t size,
153					enum dma_data_direction direction)
154{
155	BUG_ON(!valid_dma_direction(direction));
156
157	__dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
158}
159EXPORT_SYMBOL(dma_sync_single_range_for_device);
160
161void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
162			 enum dma_data_direction direction)
163{
164	int i;
165
166	BUG_ON(!valid_dma_direction(direction));
167
168	/* Make sure that gcc doesn't leave the empty loop body.  */
169	for_each_sg(sg, sg, nelems, i)
170		__dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
171}
172EXPORT_SYMBOL(dma_sync_sg_for_cpu);
173
174void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
175				int nelems, enum dma_data_direction direction)
176{
177	int i;
178
179	BUG_ON(!valid_dma_direction(direction));
180
181	/* Make sure that gcc doesn't leave the empty loop body.  */
182	for_each_sg(sg, sg, nelems, i)
183		__dma_sync_for_device(sg_virt(sg), sg->length, direction);
184
185}
186EXPORT_SYMBOL(dma_sync_sg_for_device);
187