1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file COPYING in the main directory of this archive
4 * for more details.
5 */
6
7#undef DEBUG
8
9#include <linux/dma-mapping.h>
10#include <linux/device.h>
11#include <linux/kernel.h>
12#include <linux/scatterlist.h>
13#include <linux/slab.h>
14#include <linux/vmalloc.h>
15#include <linux/export.h>
16
17#include <asm/pgalloc.h>
18
19#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
20
21void *dma_alloc_coherent(struct device *dev, size_t size,
22			 dma_addr_t *handle, gfp_t flag)
23{
24	struct page *page, **map;
25	pgprot_t pgprot;
26	void *addr;
27	int i, order;
28
29	pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
30
31	size = PAGE_ALIGN(size);
32	order = get_order(size);
33
34	page = alloc_pages(flag, order);
35	if (!page)
36		return NULL;
37
38	*handle = page_to_phys(page);
39	map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
40	if (!map) {
41		__free_pages(page, order);
42		return NULL;
43	}
44	split_page(page, order);
45
46	order = 1 << order;
47	size >>= PAGE_SHIFT;
48	map[0] = page;
49	for (i = 1; i < size; i++)
50		map[i] = page + i;
51	for (; i < order; i++)
52		__free_page(page + i);
53	pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
54	if (CPU_IS_040_OR_060)
55		pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
56	else
57		pgprot_val(pgprot) |= _PAGE_NOCACHE030;
58	addr = vmap(map, size, VM_MAP, pgprot);
59	kfree(map);
60
61	return addr;
62}
63
64void dma_free_coherent(struct device *dev, size_t size,
65		       void *addr, dma_addr_t handle)
66{
67	pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
68	vfree(addr);
69}
70
71#else
72
73#include <asm/cacheflush.h>
74
75void *dma_alloc_coherent(struct device *dev, size_t size,
76			   dma_addr_t *dma_handle, gfp_t gfp)
77{
78	void *ret;
79	/* ignore region specifiers */
80	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
81
82	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
83		gfp |= GFP_DMA;
84	ret = (void *)__get_free_pages(gfp, get_order(size));
85
86	if (ret != NULL) {
87		memset(ret, 0, size);
88		*dma_handle = virt_to_phys(ret);
89	}
90	return ret;
91}
92
93void dma_free_coherent(struct device *dev, size_t size,
94			 void *vaddr, dma_addr_t dma_handle)
95{
96	free_pages((unsigned long)vaddr, get_order(size));
97}
98
99#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
100
101EXPORT_SYMBOL(dma_alloc_coherent);
102EXPORT_SYMBOL(dma_free_coherent);
103
104void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
105				size_t size, enum dma_data_direction dir)
106{
107	switch (dir) {
108	case DMA_BIDIRECTIONAL:
109	case DMA_TO_DEVICE:
110		cache_push(handle, size);
111		break;
112	case DMA_FROM_DEVICE:
113		cache_clear(handle, size);
114		break;
115	default:
116		if (printk_ratelimit())
117			printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
118		break;
119	}
120}
121EXPORT_SYMBOL(dma_sync_single_for_device);
122
123void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
124			    int nents, enum dma_data_direction dir)
125{
126	int i;
127	struct scatterlist *sg;
128
129	for_each_sg(sglist, sg, nents, i) {
130		dma_sync_single_for_device(dev, sg->dma_address, sg->length,
131					   dir);
132	}
133}
134EXPORT_SYMBOL(dma_sync_sg_for_device);
135
136dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
137			  enum dma_data_direction dir)
138{
139	dma_addr_t handle = virt_to_bus(addr);
140
141	dma_sync_single_for_device(dev, handle, size, dir);
142	return handle;
143}
144EXPORT_SYMBOL(dma_map_single);
145
146dma_addr_t dma_map_page(struct device *dev, struct page *page,
147			unsigned long offset, size_t size,
148			enum dma_data_direction dir)
149{
150	dma_addr_t handle = page_to_phys(page) + offset;
151
152	dma_sync_single_for_device(dev, handle, size, dir);
153	return handle;
154}
155EXPORT_SYMBOL(dma_map_page);
156
157int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
158	       enum dma_data_direction dir)
159{
160	int i;
161	struct scatterlist *sg;
162
163	for_each_sg(sglist, sg, nents, i) {
164		sg->dma_address = sg_phys(sg);
165		dma_sync_single_for_device(dev, sg->dma_address, sg->length,
166					   dir);
167	}
168	return nents;
169}
170EXPORT_SYMBOL(dma_map_sg);
171