47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2000 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.
|
|
*
|
|
* On the overdrive, we can only DMA from memory behind the PCI bus!
|
|
* this means that all DMA'able memory must come from there.
|
|
* this restriction will not apply to later boards.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/pci.h>
|
|
#include <asm/io.h>
|
|
|
|
void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
|
|
dma_addr_t * dma_handle)
|
|
{
|
|
void *ret;
|
|
int gfp = GFP_ATOMIC;
|
|
|
|
printk("BUG: pci_alloc_consistent() called - not yet supported\n");
|
|
/* We ALWAYS need DMA memory on the overdrive hardware,
|
|
* due to it's extreme weirdness
|
|
* Need to flush the cache here as well, since the memory
|
|
* can still be seen through the cache!
|
|
*/
|
|
gfp |= GFP_DMA;
|
|
ret = (void *) __get_free_pages(gfp, get_order(size));
|
|
|
|
if (ret != NULL) {
|
|
memset(ret, 0, size);
|
|
*dma_handle = virt_to_bus(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void pci_free_consistent(struct pci_dev *hwdev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle)
|
|
{
|
|
free_pages((unsigned long) vaddr, get_order(size));
|
|
}
|