https://github.com/torvalds/linux
Tip revision: bd71c2b17468a2531fb4c81ec1d73520845e97e1 authored by Linus Torvalds on 17 February 2006, 22:23:45 UTC
Linux v2.6.16-rc4
Linux v2.6.16-rc4
Tip revision: bd71c2b
dma-noncoherent.c
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
* Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org>
* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/dma-mapping.h>
#include <asm/cache.h>
#include <asm/io.h>
/*
* Warning on the terminology - Linux calls an uncached area coherent;
* MIPS terminology calls memory areas with hardware maintained coherency
* coherent.
*/
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t * dma_handle, gfp_t gfp)
{
void *ret;
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
gfp |= GFP_DMA;
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret != NULL) {
memset(ret, 0, size);
*dma_handle = virt_to_phys(ret);
}
return ret;
}
EXPORT_SYMBOL(dma_alloc_noncoherent);
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t * dma_handle, gfp_t gfp)
{
void *ret;
ret = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
if (ret) {
dma_cache_wback_inv((unsigned long) ret, size);
ret = UNCAC_ADDR(ret);
}
return ret;
}
EXPORT_SYMBOL(dma_alloc_coherent);
void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle)
{
free_pages((unsigned long) vaddr, get_order(size));
}
EXPORT_SYMBOL(dma_free_noncoherent);
void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle)
{
unsigned long addr = (unsigned long) vaddr;
addr = CAC_ADDR(addr);
free_pages(addr, get_order(size));
}
EXPORT_SYMBOL(dma_free_coherent);
static inline void __dma_sync(unsigned long addr, size_t size,
enum dma_data_direction direction)
{
switch (direction) {
case DMA_TO_DEVICE:
dma_cache_wback(addr, size);
break;
case DMA_FROM_DEVICE:
dma_cache_inv(addr, size);
break;
case DMA_BIDIRECTIONAL:
dma_cache_wback_inv(addr, size);
break;
default:
BUG();
}
}
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction)
{
unsigned long addr = (unsigned long) ptr;
__dma_sync(addr, size, direction);
return virt_to_phys(ptr);
}
EXPORT_SYMBOL(dma_map_single);
void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
unsigned long addr;
addr = dma_addr + PAGE_OFFSET;
//__dma_sync(addr, size, direction);
}
EXPORT_SYMBOL(dma_unmap_single);
int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
int i;
BUG_ON(direction == DMA_NONE);
for (i = 0; i < nents; i++, sg++) {
unsigned long addr;
addr = (unsigned long) page_address(sg->page);
if (addr) {
__dma_sync(addr + sg->offset, sg->length, direction);
sg->dma_address = (dma_addr_t)page_to_phys(sg->page)
+ sg->offset;
}
}
return nents;
}
EXPORT_SYMBOL(dma_map_sg);
dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction direction)
{
unsigned long addr;
BUG_ON(direction == DMA_NONE);
addr = (unsigned long) page_address(page) + offset;
dma_cache_wback_inv(addr, size);
return page_to_phys(page) + offset;
}
EXPORT_SYMBOL(dma_map_page);
void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
if (direction != DMA_TO_DEVICE) {
unsigned long addr;
addr = dma_address + PAGE_OFFSET;
dma_cache_wback_inv(addr, size);
}
}
EXPORT_SYMBOL(dma_unmap_page);
void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction)
{
unsigned long addr;
int i;
BUG_ON(direction == DMA_NONE);
if (direction == DMA_TO_DEVICE)
return;
for (i = 0; i < nhwentries; i++, sg++) {
addr = (unsigned long) page_address(sg->page);
if (addr)
__dma_sync(addr + sg->offset, sg->length, direction);
}
}
EXPORT_SYMBOL(dma_unmap_sg);
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
{
unsigned long addr;
BUG_ON(direction == DMA_NONE);
addr = dma_handle + PAGE_OFFSET;
__dma_sync(addr, size, direction);
}
EXPORT_SYMBOL(dma_sync_single_for_cpu);
void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
{
unsigned long addr;
BUG_ON(direction == DMA_NONE);
addr = dma_handle + PAGE_OFFSET;
__dma_sync(addr, size, direction);
}
EXPORT_SYMBOL(dma_sync_single_for_device);
void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
unsigned long offset, size_t size, enum dma_data_direction direction)
{
unsigned long addr;
BUG_ON(direction == DMA_NONE);
addr = dma_handle + offset + PAGE_OFFSET;
__dma_sync(addr, size, direction);
}
EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
unsigned long offset, size_t size, enum dma_data_direction direction)
{
unsigned long addr;
BUG_ON(direction == DMA_NONE);
addr = dma_handle + offset + PAGE_OFFSET;
__dma_sync(addr, size, direction);
}
EXPORT_SYMBOL(dma_sync_single_range_for_device);
void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
{
int i;
BUG_ON(direction == DMA_NONE);
/* Make sure that gcc doesn't leave the empty loop body. */
for (i = 0; i < nelems; i++, sg++)
__dma_sync((unsigned long)page_address(sg->page),
sg->length, direction);
}
EXPORT_SYMBOL(dma_sync_sg_for_cpu);
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
{
int i;
BUG_ON(direction == DMA_NONE);
/* Make sure that gcc doesn't leave the empty loop body. */
for (i = 0; i < nelems; i++, sg++)
__dma_sync((unsigned long)page_address(sg->page),
sg->length, direction);
}
EXPORT_SYMBOL(dma_sync_sg_for_device);
int dma_mapping_error(dma_addr_t dma_addr)
{
return 0;
}
EXPORT_SYMBOL(dma_mapping_error);
int dma_supported(struct device *dev, u64 mask)
{
/*
* we fall back to GFP_DMA when the mask isn't all 1s,
* so we can't guarantee allocations that must be
* within a tighter range than GFP_DMA..
*/
if (mask < 0x00ffffff)
return 0;
return 1;
}
EXPORT_SYMBOL(dma_supported);
int dma_is_consistent(dma_addr_t dma_addr)
{
return 1;
}
EXPORT_SYMBOL(dma_is_consistent);
void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction)
{
if (direction == DMA_NONE)
return;
dma_cache_wback_inv((unsigned long)vaddr, size);
}
EXPORT_SYMBOL(dma_cache_sync);
/* The DAC routines are a PCIism.. */
#ifdef CONFIG_PCI
#include <linux/pci.h>
dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
struct page *page, unsigned long offset, int direction)
{
return (dma64_addr_t)page_to_phys(page) + offset;
}
EXPORT_SYMBOL(pci_dac_page_to_dma);
struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
dma64_addr_t dma_addr)
{
return mem_map + (dma_addr >> PAGE_SHIFT);
}
EXPORT_SYMBOL(pci_dac_dma_to_page);
unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
dma64_addr_t dma_addr)
{
return dma_addr & ~PAGE_MASK;
}
EXPORT_SYMBOL(pci_dac_dma_to_offset);
void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
dma64_addr_t dma_addr, size_t len, int direction)
{
BUG_ON(direction == PCI_DMA_NONE);
dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
}
EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);
void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
dma64_addr_t dma_addr, size_t len, int direction)
{
BUG_ON(direction == PCI_DMA_NONE);
dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
}
EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);
#endif /* CONFIG_PCI */