383 строки
8.4 KiB
C
383 строки
8.4 KiB
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>
|
|
* Copyright (C) 2005 Ilya A. Volynets-Evenbakh <ilya@total-knowledge.com>
|
|
* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
|
|
* IP32 changes by Ilya.
|
|
*/
|
|
#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>
|
|
#include <asm/ip32/crime.h>
|
|
|
|
/*
|
|
* Warning on the terminology - Linux calls an uncached area coherent;
|
|
* MIPS terminology calls memory areas with hardware maintained coherency
|
|
* coherent.
|
|
*/
|
|
|
|
/*
|
|
* Few notes.
|
|
* 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M
|
|
* 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for native-endian)
|
|
* 3. All other devices see memory as one big chunk at 0x40000000
|
|
* 4. Non-PCI devices will pass NULL as struct device*
|
|
* Thus we translate differently, depending on device.
|
|
*/
|
|
|
|
#define RAM_OFFSET_MASK 0x3fffffff
|
|
|
|
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) {
|
|
unsigned long addr = virt_to_phys(ret)&RAM_OFFSET_MASK;
|
|
memset(ret, 0, size);
|
|
if(dev==NULL)
|
|
addr+= CRIME_HI_MEM_BASE;
|
|
*dma_handle = addr;
|
|
}
|
|
|
|
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;
|
|
|
|
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();
|
|
}
|
|
|
|
addr = virt_to_phys(ptr)&RAM_OFFSET_MASK;
|
|
if(dev == NULL)
|
|
addr+=CRIME_HI_MEM_BASE;
|
|
return (dma_addr_t)addr;
|
|
}
|
|
|
|
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)
|
|
{
|
|
switch (direction) {
|
|
case DMA_TO_DEVICE:
|
|
break;
|
|
|
|
case DMA_FROM_DEVICE:
|
|
break;
|
|
|
|
case DMA_BIDIRECTIONAL:
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
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)+sg->offset;
|
|
if (addr)
|
|
__dma_sync(addr, sg->length, direction);
|
|
addr = __pa(addr)&RAM_OFFSET_MASK;
|
|
if(dev == NULL)
|
|
addr += CRIME_HI_MEM_BASE;
|
|
sg->dma_address = (dma_addr_t)addr;
|
|
}
|
|
|
|
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);
|
|
addr = __pa(addr)&RAM_OFFSET_MASK;
|
|
if(dev == NULL)
|
|
addr += CRIME_HI_MEM_BASE;
|
|
|
|
return (dma_addr_t)addr;
|
|
}
|
|
|
|
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;
|
|
|
|
dma_address&=RAM_OFFSET_MASK;
|
|
addr = dma_address + PAGE_OFFSET;
|
|
if(dma_address>=256*1024*1024)
|
|
addr+=CRIME_HI_MEM_BASE;
|
|
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)
|
|
continue;
|
|
dma_cache_wback_inv(addr + sg->offset, sg->length);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
dma_handle&=RAM_OFFSET_MASK;
|
|
addr = dma_handle + PAGE_OFFSET;
|
|
if(dma_handle>=256*1024*1024)
|
|
addr+=CRIME_HI_MEM_BASE;
|
|
__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);
|
|
|
|
dma_handle&=RAM_OFFSET_MASK;
|
|
addr = dma_handle + PAGE_OFFSET;
|
|
if(dma_handle>=256*1024*1024)
|
|
addr+=CRIME_HI_MEM_BASE;
|
|
__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);
|
|
|
|
dma_handle&=RAM_OFFSET_MASK;
|
|
addr = dma_handle + offset + PAGE_OFFSET;
|
|
if(dma_handle>=256*1024*1024)
|
|
addr+=CRIME_HI_MEM_BASE;
|
|
__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);
|
|
|
|
dma_handle&=RAM_OFFSET_MASK;
|
|
addr = dma_handle + offset + PAGE_OFFSET;
|
|
if(dma_handle>=256*1024*1024)
|
|
addr+=CRIME_HI_MEM_BASE;
|
|
__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);
|
|
|