blob: 475311390fd63a7d157cd19f54f2d6d3d3ecbfa3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/*
* Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* Dynamic DMA mapping support.
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/addrspace.h>
void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
dma_addr_t * dma_handle)
{
void *ret;
int gfp = GFP_ATOMIC;
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret != NULL) {
/* Is it neccessary to do the memset? */
memset(ret, 0, size);
*dma_handle = virt_to_bus(ret);
}
/* We must flush the cache before we pass it on to the device */
flush_cache_all();
return P2SEGADDR(ret);
}
void pci_free_consistent(struct pci_dev *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
unsigned long p1addr=P1SEGADDR((unsigned long)vaddr);
free_pages(p1addr, get_order(size));
}
|
