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
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>
17 #include <asm/pgalloc.h>
19 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
21 static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
22 gfp_t flag, unsigned long attrs)
24 struct page *page, **map;
29 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
31 size = PAGE_ALIGN(size);
32 order = get_order(size);
34 page = alloc_pages(flag, order);
38 *handle = page_to_phys(page);
39 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
41 __free_pages(page, order);
44 split_page(page, order);
49 for (i = 1; i < size; 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;
57 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
58 addr = vmap(map, size, VM_MAP, pgprot);
64 static void m68k_dma_free(struct device *dev, size_t size, void *addr,
65 dma_addr_t handle, unsigned long attrs)
67 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
73 #include <asm/cacheflush.h>
75 static void *m68k_dma_alloc(struct device *dev, size_t size,
76 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
79 /* ignore region specifiers */
80 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
82 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
84 ret = (void *)__get_free_pages(gfp, get_order(size));
88 *dma_handle = virt_to_phys(ret);
93 static void m68k_dma_free(struct device *dev, size_t size, void *vaddr,
94 dma_addr_t dma_handle, unsigned long attrs)
96 free_pages((unsigned long)vaddr, get_order(size));
99 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
101 static void m68k_dma_sync_single_for_device(struct device *dev,
102 dma_addr_t handle, size_t size, enum dma_data_direction dir)
105 case DMA_BIDIRECTIONAL:
107 cache_push(handle, size);
109 case DMA_FROM_DEVICE:
110 cache_clear(handle, size);
113 if (printk_ratelimit())
114 printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
119 static void m68k_dma_sync_sg_for_device(struct device *dev,
120 struct scatterlist *sglist, int nents, enum dma_data_direction dir)
123 struct scatterlist *sg;
125 for_each_sg(sglist, sg, nents, i) {
126 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
131 static dma_addr_t m68k_dma_map_page(struct device *dev, struct page *page,
132 unsigned long offset, size_t size, enum dma_data_direction dir,
135 dma_addr_t handle = page_to_phys(page) + offset;
137 dma_sync_single_for_device(dev, handle, size, dir);
141 static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,
142 int nents, enum dma_data_direction dir, unsigned long attrs)
145 struct scatterlist *sg;
147 for_each_sg(sglist, sg, nents, i) {
148 sg->dma_address = sg_phys(sg);
149 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
155 struct dma_map_ops m68k_dma_ops = {
156 .alloc = m68k_dma_alloc,
157 .free = m68k_dma_free,
158 .map_page = m68k_dma_map_page,
159 .map_sg = m68k_dma_map_sg,
160 .sync_single_for_device = m68k_dma_sync_single_for_device,
161 .sync_sg_for_device = m68k_dma_sync_sg_for_device,
163 EXPORT_SYMBOL(m68k_dma_ops);