2 * arch/sh/mm/consistent.c
4 * Copyright (C) 2004 - 2007 Paul Mundt
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
11 #include <linux/dma-mapping.h>
12 #include <asm/cacheflush.h>
13 #include <asm/addrspace.h>
16 void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle)
18 struct page *page, *end, *free;
22 size = PAGE_ALIGN(size);
23 order = get_order(size);
25 page = alloc_pages(gfp, order);
28 split_page(page, order);
30 ret = page_address(page);
31 *handle = virt_to_phys(ret);
33 vp = ioremap_nocache(*handle, size);
35 free_pages((unsigned long)ret, order);
42 * We must flush the cache before we pass it on to the device
44 dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
46 page = virt_to_page(ret);
47 free = page + (size >> PAGE_SHIFT);
48 end = page + (1 << order);
50 while (++page < end) {
51 /* Free any unused pages */
59 EXPORT_SYMBOL(consistent_alloc);
61 void consistent_free(void *vaddr, size_t size, dma_addr_t dma_handle)
66 addr = (unsigned long)phys_to_virt((unsigned long)dma_handle);
67 page = virt_to_page(addr);
69 free_pages(addr, get_order(size));
73 EXPORT_SYMBOL(consistent_free);
75 void consistent_sync(void *vaddr, size_t size, int direction)
80 void *p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
84 case DMA_FROM_DEVICE: /* invalidate only */
85 __flush_invalidate_region(p1addr, size);
87 case DMA_TO_DEVICE: /* writeback only */
88 __flush_wback_region(p1addr, size);
90 case DMA_BIDIRECTIONAL: /* writeback and invalidate */
91 __flush_purge_region(p1addr, size);
97 EXPORT_SYMBOL(consistent_sync);