kernel-fxtec-pro1x/arch/sh/boards/overdrive/pcidma.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

46 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));
}