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-noncoherent.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/platform_device.h>
13 #include <linux/scatterlist.h>
14 #include <linux/slab.h>
15 #include <linux/vmalloc.h>
16 #include <linux/export.h>
17
18 #include <asm/pgalloc.h>
19
20 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
arch_dma_prep_coherent(struct page * page,size_t size)21 void arch_dma_prep_coherent(struct page *page, size_t size)
22 {
23 cache_push(page_to_phys(page), size);
24 }
25
pgprot_dmacoherent(pgprot_t prot)26 pgprot_t pgprot_dmacoherent(pgprot_t prot)
27 {
28 if (CPU_IS_040_OR_060) {
29 pgprot_val(prot) &= ~_PAGE_CACHE040;
30 pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
31 } else {
32 pgprot_val(prot) |= _PAGE_NOCACHE030;
33 }
34 return prot;
35 }
36 #else
37
38 #include <asm/cacheflush.h>
39
arch_dma_alloc(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t gfp,unsigned long attrs)40 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
41 gfp_t gfp, unsigned long attrs)
42 {
43 void *ret;
44
45 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
46 gfp |= GFP_DMA;
47 ret = (void *)__get_free_pages(gfp, get_order(size));
48
49 if (ret != NULL) {
50 memset(ret, 0, size);
51 *dma_handle = virt_to_phys(ret);
52 }
53 return ret;
54 }
55
arch_dma_free(struct device * dev,size_t size,void * vaddr,dma_addr_t dma_handle,unsigned long attrs)56 void arch_dma_free(struct device *dev, size_t size, void *vaddr,
57 dma_addr_t dma_handle, unsigned long attrs)
58 {
59 free_pages((unsigned long)vaddr, get_order(size));
60 }
61
62 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
63
arch_sync_dma_for_device(struct device * dev,phys_addr_t handle,size_t size,enum dma_data_direction dir)64 void arch_sync_dma_for_device(struct device *dev, phys_addr_t handle,
65 size_t size, enum dma_data_direction dir)
66 {
67 switch (dir) {
68 case DMA_BIDIRECTIONAL:
69 case DMA_TO_DEVICE:
70 cache_push(handle, size);
71 break;
72 case DMA_FROM_DEVICE:
73 cache_clear(handle, size);
74 break;
75 default:
76 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
77 dir);
78 break;
79 }
80 }
81