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- /*
- * Dynamic DMA mapping support.
- *
- * On cris there is no hardware dynamic DMA address translation,
- * so consistent alloc/free are merely page allocation/freeing.
- * The rest of the dynamic DMA mapping interface is implemented
- * in asm/pci.h.
- *
- * Borrowed from i386.
- */
- #include <linux/types.h>
- #include <linux/mm.h>
- #include <linux/string.h>
- #include <linux/pci.h>
- #include <linux/gfp.h>
- #include <asm/io.h>
- static void *v32_dma_alloc(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
- {
- void *ret;
- /* ignore region specifiers */
- gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
- if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
- gfp |= GFP_DMA;
- ret = (void *)__get_free_pages(gfp, get_order(size));
- if (ret != NULL) {
- memset(ret, 0, size);
- *dma_handle = virt_to_phys(ret);
- }
- return ret;
- }
- static void v32_dma_free(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_handle, unsigned long attrs)
- {
- free_pages((unsigned long)vaddr, get_order(size));
- }
- static inline dma_addr_t v32_dma_map_page(struct device *dev,
- struct page *page, unsigned long offset, size_t size,
- enum dma_data_direction direction, unsigned long attrs)
- {
- return page_to_phys(page) + offset;
- }
- static inline int v32_dma_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction direction,
- unsigned long attrs)
- {
- printk("Map sg\n");
- return nents;
- }
- static inline int v32_dma_supported(struct device *dev, u64 mask)
- {
- /*
- * we fall back to GFP_DMA when the mask isn't all 1s,
- * so we can't guarantee allocations that must be
- * within a tighter range than GFP_DMA..
- */
- if (mask < 0x00ffffff)
- return 0;
- return 1;
- }
- struct dma_map_ops v32_dma_ops = {
- .alloc = v32_dma_alloc,
- .free = v32_dma_free,
- .map_page = v32_dma_map_page,
- .map_sg = v32_dma_map_sg,
- .dma_supported = v32_dma_supported,
- };
- EXPORT_SYMBOL(v32_dma_ops);
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