2 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
3 * Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org)
5 * May be copied or modified under the terms of the GNU General Public
6 * License. See linux/COPYING for more information.
8 * Dynamic DMA mapping support.
10 #include <linux/types.h>
12 #include <linux/string.h>
13 #include <linux/pci.h>
14 #include <linux/module.h>
17 void *consistent_alloc(struct pci_dev *hwdev, size_t size,
18 dma_addr_t *dma_handle)
24 if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
27 ret = (void *)__get_free_pages(gfp, get_order(size));
29 /* now call our friend ioremap_nocache to give us an uncached area */
30 vp = ioremap_nocache(virt_to_phys(ret), size);
34 *dma_handle = virt_to_phys(ret);
35 dma_cache_wback_inv((unsigned long)ret, size);
40 EXPORT_SYMBOL(consistent_alloc);
42 void consistent_free(struct pci_dev *hwdev, size_t size,
43 void *vaddr, dma_addr_t dma_handle)
47 alloc = phys_to_virt((unsigned long)dma_handle);
48 free_pages((unsigned long)alloc, get_order(size));
52 EXPORT_SYMBOL(consistent_free);