You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
1.0 KiB
43 lines
1.0 KiB
20 years ago
|
/*
|
||
|
|
* 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));
|
||
|
|
}
|