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)
21
arch_dma_alloc(struct device * dev,size_t size,dma_addr_t * handle,gfp_t flag,unsigned long attrs)22 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
23 gfp_t flag, unsigned long attrs)
24 {
25 struct page *page, **map;
26 pgprot_t pgprot;
27 void *addr;
28 int i, order;
29
30 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
31
32 size = PAGE_ALIGN(size);
33 order = get_order(size);
34
35 page = alloc_pages(flag, order);
36 if (!page)
37 return NULL;
38
39 *handle = page_to_phys(page);
40 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
41 if (!map) {
42 __free_pages(page, order);
43 return NULL;
44 }
45 split_page(page, order);
46
47 order = 1 << order;
48 size >>= PAGE_SHIFT;
49 map[0] = page;
50 for (i = 1; i < size; i++)
51 map[i] = page + i;
52 for (; i < order; i++)
53 __free_page(page + i);
54 pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
55 if (CPU_IS_040_OR_060)
56 pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
57 else
58 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
59 addr = vmap(map, size, VM_MAP, pgprot);
60 kfree(map);
61
62 return addr;
63 }
64
arch_dma_free(struct device * dev,size_t size,void * addr,dma_addr_t handle,unsigned long attrs)65 void arch_dma_free(struct device *dev, size_t size, void *addr,
66 dma_addr_t handle, unsigned long attrs)
67 {
68 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
69 vfree(addr);
70 }
71
72 #else
73
74 #include <asm/cacheflush.h>
75
arch_dma_alloc(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t gfp,unsigned long attrs)76 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
77 gfp_t gfp, unsigned long attrs)
78 {
79 void *ret;
80
81 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
82 gfp |= GFP_DMA;
83 ret = (void *)__get_free_pages(gfp, get_order(size));
84
85 if (ret != NULL) {
86 memset(ret, 0, size);
87 *dma_handle = virt_to_phys(ret);
88 }
89 return ret;
90 }
91
arch_dma_free(struct device * dev,size_t size,void * vaddr,dma_addr_t dma_handle,unsigned long attrs)92 void arch_dma_free(struct device *dev, size_t size, void *vaddr,
93 dma_addr_t dma_handle, unsigned long attrs)
94 {
95 free_pages((unsigned long)vaddr, get_order(size));
96 }
97
98 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
99
arch_sync_dma_for_device(struct device * dev,phys_addr_t handle,size_t size,enum dma_data_direction dir)100 void arch_sync_dma_for_device(struct device *dev, phys_addr_t handle,
101 size_t size, enum dma_data_direction dir)
102 {
103 switch (dir) {
104 case DMA_BIDIRECTIONAL:
105 case DMA_TO_DEVICE:
106 cache_push(handle, size);
107 break;
108 case DMA_FROM_DEVICE:
109 cache_clear(handle, size);
110 break;
111 default:
112 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
113 dir);
114 break;
115 }
116 }
117
arch_setup_pdev_archdata(struct platform_device * pdev)118 void arch_setup_pdev_archdata(struct platform_device *pdev)
119 {
120 if (pdev->dev.coherent_dma_mask == DMA_MASK_NONE &&
121 pdev->dev.dma_mask == NULL) {
122 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
123 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
124 }
125 }
126
