linux/arch/mips/mm/dma-default.c

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/*
* 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, 06 Ralf Baechle <ralf@linux-mips.org>
* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
*/
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <dma-coherence.h>
static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
{
unsigned long addr = plat_dma_addr_to_phys(dma_addr);
return (unsigned long)phys_to_virt(addr);
}
/*
* Warning on the terminology - Linux calls an uncached area coherent;
* MIPS terminology calls memory areas with hardware maintained coherency
* coherent.
*/
static inline int cpu_is_noncoherent_r10000(struct device *dev)
{
return !plat_device_is_coherent(dev) &&
(current_cpu_data.cputype == CPU_R10000 &&
current_cpu_data.cputype == CPU_R12000);
}
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 = plat_map_dma_mem(dev, ret, size);
}
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;
/* 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) {
memset(ret, 0, size);
*dma_handle = plat_map_dma_mem(dev, ret, size);
if (!plat_device_is_coherent(dev)) {
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;
if (!plat_device_is_coherent(dev))
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;
if (!plat_device_is_coherent(dev))
__dma_sync(addr, size, direction);
return plat_map_dma_mem(dev, ptr, size);
}
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)
{
if (cpu_is_noncoherent_r10000(dev))
__dma_sync(dma_addr_to_virt(dma_addr), size,
direction);
plat_unmap_dma_mem(dma_addr);
}
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 (!plat_device_is_coherent(dev) && addr)
__dma_sync(addr + sg->offset, sg->length, direction);
sg->dma_address = plat_map_dma_mem(dev,
(void *)(addr + sg->offset),
sg->length);
}
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)
{
BUG_ON(direction == DMA_NONE);
if (!plat_device_is_coherent(dev)) {
unsigned long addr;
addr = (unsigned long) page_address(page) + offset;
dma_cache_wback_inv(addr, size);
}
return plat_map_dma_mem_page(dev, 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 (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
unsigned long addr;
addr = plat_dma_addr_to_phys(dma_address);
dma_cache_wback_inv(addr, size);
}
plat_unmap_dma_mem(dma_address);
}
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);
for (i = 0; i < nhwentries; i++, sg++) {
if (!plat_device_is_coherent(dev) &&
direction != DMA_TO_DEVICE) {
addr = (unsigned long) page_address(sg->page);
if (addr)
__dma_sync(addr + sg->offset, sg->length,
direction);
}
plat_unmap_dma_mem(sg->dma_address);
}
}
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)
{
BUG_ON(direction == DMA_NONE);
if (cpu_is_noncoherent_r10000(dev)) {
unsigned long addr;
addr = dma_addr_to_virt(dma_handle);
__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)
{
BUG_ON(direction == DMA_NONE);
if (!plat_device_is_coherent(dev)) {
unsigned long addr;
addr = dma_addr_to_virt(dma_handle);
__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)
{
BUG_ON(direction == DMA_NONE);
if (cpu_is_noncoherent_r10000(dev)) {
unsigned long addr;
addr = dma_addr_to_virt(dma_handle);
__dma_sync(addr + offset, 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)
{
BUG_ON(direction == DMA_NONE);
if (!plat_device_is_coherent(dev)) {
unsigned long addr;
addr = dma_addr_to_virt(dma_handle);
__dma_sync(addr + offset, 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++) {
if (cpu_is_noncoherent_r10000(dev))
__dma_sync((unsigned long)page_address(sg->page),
sg->length, direction);
plat_unmap_dma_mem(sg->dma_address);
}
}
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++) {
if (!plat_device_is_coherent(dev))
__dma_sync((unsigned long)page_address(sg->page),
sg->length, direction);
plat_unmap_dma_mem(sg->dma_address);
}
}
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(struct device *dev, dma_addr_t dma_addr)
{
return plat_device_is_coherent(dev);
}
EXPORT_SYMBOL(dma_is_consistent);
void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
if (!plat_device_is_coherent(dev))
dma_cache_wback_inv((unsigned long)vaddr, size);
}
EXPORT_SYMBOL(dma_cache_sync);