File: /usr/src/linux/arch/ppc/kernel/pci-dma.c

1     /*
2      * BK Id: SCCS/s.pci-dma.c 1.5 05/17/01 18:14:21 cort
3      */
4     /*
5      * Copyright (C) 2000   Ani Joshi <ajoshi@unixbox.com>
6      *
7      *
8      * Dynamic DMA mapping support.
9      *
10      * swiped from i386
11      *
12      */
13     
14     #include <linux/types.h>
15     #include <linux/mm.h>
16     #include <linux/string.h>
17     #include <linux/pci.h>
18     #include <asm/io.h>
19     
20     void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
21     			   dma_addr_t *dma_handle)
22     {
23     	void *ret;
24     	int gfp = GFP_ATOMIC;
25     
26     	if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
27     		gfp |= GFP_DMA;
28     	ret = (void *)__get_free_pages(gfp, get_order(size));
29     
30     	if (ret != NULL) {
31     		memset(ret, 0, size);
32     		*dma_handle = virt_to_bus(ret);
33     	}
34     	return ret;
35     }
36     
37     void pci_free_consistent(struct pci_dev *hwdev, size_t size,
38     			 void *vaddr, dma_addr_t dma_handle)
39     {
40     	free_pages((unsigned long)vaddr, get_order(size));
41     }
42