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/platform_device.h>
13 #include <linux/scatterlist.h>
14 #include <linux/slab.h>
15 #include <linux/vmalloc.h>
16 #include <linux/export.h>
18 #include <asm/pgalloc.h>
20 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
22 static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
23 gfp_t flag, unsigned long attrs)
25 struct page *page, **map;
30 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
32 size = PAGE_ALIGN(size);
33 order = get_order(size);
35 page = alloc_pages(flag, order);
39 *handle = page_to_phys(page);
40 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
42 __free_pages(page, order);
45 split_page(page, order);
50 for (i = 1; i < size; 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;
58 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
59 addr = vmap(map, size, VM_MAP, pgprot);
65 static void m68k_dma_free(struct device *dev, size_t size, void *addr,
66 dma_addr_t handle, unsigned long attrs)
68 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
74 #include <asm/cacheflush.h>
76 static void *m68k_dma_alloc(struct device *dev, size_t size,
77 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
81 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
83 ret = (void *)__get_free_pages(gfp, get_order(size));
87 *dma_handle = virt_to_phys(ret);
92 static void m68k_dma_free(struct device *dev, size_t size, void *vaddr,
93 dma_addr_t dma_handle, unsigned long attrs)
95 free_pages((unsigned long)vaddr, get_order(size));
98 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
100 static void m68k_dma_sync_single_for_device(struct device *dev,
101 dma_addr_t handle, size_t size, enum dma_data_direction dir)
104 case DMA_BIDIRECTIONAL:
106 cache_push(handle, size);
108 case DMA_FROM_DEVICE:
109 cache_clear(handle, size);
112 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
118 static void m68k_dma_sync_sg_for_device(struct device *dev,
119 struct scatterlist *sglist, int nents, enum dma_data_direction dir)
122 struct scatterlist *sg;
124 for_each_sg(sglist, sg, nents, i) {
125 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
130 static dma_addr_t m68k_dma_map_page(struct device *dev, struct page *page,
131 unsigned long offset, size_t size, enum dma_data_direction dir,
134 dma_addr_t handle = page_to_phys(page) + offset;
136 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
137 dma_sync_single_for_device(dev, handle, size, dir);
142 static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,
143 int nents, enum dma_data_direction dir, unsigned long attrs)
146 struct scatterlist *sg;
148 for_each_sg(sglist, sg, nents, i) {
149 sg->dma_address = sg_phys(sg);
151 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
154 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
160 const struct dma_map_ops m68k_dma_ops = {
161 .alloc = m68k_dma_alloc,
162 .free = m68k_dma_free,
163 .map_page = m68k_dma_map_page,
164 .map_sg = m68k_dma_map_sg,
165 .sync_single_for_device = m68k_dma_sync_single_for_device,
166 .sync_sg_for_device = m68k_dma_sync_sg_for_device,
168 EXPORT_SYMBOL(m68k_dma_ops);
170 void arch_setup_pdev_archdata(struct platform_device *pdev)
172 if (pdev->dev.coherent_dma_mask == DMA_MASK_NONE &&
173 pdev->dev.dma_mask == NULL) {
174 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
175 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;