1 /*
2 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
3 *
4 * May be copied or modified under the terms of the GNU General Public
5 * License. See linux/COPYING for more information.
6 *
7 * Dynamic DMA mapping support.
8 */
9
10 #include <linux/types.h>
11 #include <linux/mm.h>
12 #include <linux/string.h>
13 #include <linux/pci.h>
14 #include <asm/io.h>
15 #include <asm/addrspace.h>
16
17
pci_alloc_consistent(struct pci_dev * hwdev,size_t size,dma_addr_t * dma_handle)18 void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
19 dma_addr_t * dma_handle)
20 {
21 void *ret;
22 int gfp = GFP_ATOMIC;
23
24 ret = (void *) __get_free_pages(gfp, get_order(size));
25
26 if (ret != NULL) {
27 /* Is it neccessary to do the memset? */
28 memset(ret, 0, size);
29 *dma_handle = virt_to_bus(ret);
30 }
31 /* We must flush the cache before we pass it on to the device */
32 dma_cache_wback_inv(ret, size);
33 return P2SEGADDR(ret);
34 }
35
pci_free_consistent(struct pci_dev * hwdev,size_t size,void * vaddr,dma_addr_t dma_handle)36 void pci_free_consistent(struct pci_dev *hwdev, size_t size,
37 void *vaddr, dma_addr_t dma_handle)
38 {
39 unsigned long p1addr=P1SEGADDR((unsigned long)vaddr);
40
41 free_pages(p1addr, get_order(size));
42 }
43