f1525765fb
This patch fix consistent code which had problems with consistent_free function. I am not sure if we need to call flush_tlb_all after it but it keeps tlbs synced. I added noMMU and MMU version together. Uncached shadow feature is not tested. Signed-off-by: Michal Simek <monstr@monstr.eu>
157 lines
4 KiB
C
157 lines
4 KiB
C
/*
|
|
* Copyright (C) 2009-2010 PetaLogix
|
|
* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
|
|
*
|
|
* Provide default implementations of the DMA mapping callbacks for
|
|
* directly mapped busses.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/dma-debug.h>
|
|
#include <asm/bug.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
/*
|
|
* Generic direct DMA implementation
|
|
*
|
|
* This implementation supports a per-device offset that can be applied if
|
|
* the address at which memory is visible to devices is not 0. Platform code
|
|
* can set archdata.dma_data to an unsigned long holding the offset. By
|
|
* default the offset is PCI_DRAM_OFFSET.
|
|
*/
|
|
static inline void __dma_sync_page(unsigned long paddr, unsigned long offset,
|
|
size_t size, enum dma_data_direction direction)
|
|
{
|
|
switch (direction) {
|
|
case DMA_TO_DEVICE:
|
|
flush_dcache_range(paddr + offset, paddr + offset + size);
|
|
break;
|
|
case DMA_FROM_DEVICE:
|
|
invalidate_dcache_range(paddr + offset, paddr + offset + size);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static unsigned long get_dma_direct_offset(struct device *dev)
|
|
{
|
|
if (likely(dev))
|
|
return (unsigned long)dev->archdata.dma_data;
|
|
|
|
return PCI_DRAM_OFFSET; /* FIXME Not sure if is correct */
|
|
}
|
|
|
|
#define NOT_COHERENT_CACHE
|
|
|
|
static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag)
|
|
{
|
|
#ifdef NOT_COHERENT_CACHE
|
|
return consistent_alloc(flag, size, dma_handle);
|
|
#else
|
|
void *ret;
|
|
struct page *page;
|
|
int node = dev_to_node(dev);
|
|
|
|
/* ignore region specifiers */
|
|
flag &= ~(__GFP_HIGHMEM);
|
|
|
|
page = alloc_pages_node(node, flag, get_order(size));
|
|
if (page == NULL)
|
|
return NULL;
|
|
ret = page_address(page);
|
|
memset(ret, 0, size);
|
|
*dma_handle = virt_to_phys(ret) + get_dma_direct_offset(dev);
|
|
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
static void dma_direct_free_coherent(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle)
|
|
{
|
|
#ifdef NOT_COHERENT_CACHE
|
|
consistent_free(size, vaddr);
|
|
#else
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
#endif
|
|
}
|
|
|
|
static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
/* FIXME this part of code is untested */
|
|
for_each_sg(sgl, sg, nents, i) {
|
|
sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev);
|
|
sg->dma_length = sg->length;
|
|
__dma_sync_page(page_to_phys(sg_page(sg)), sg->offset,
|
|
sg->length, direction);
|
|
}
|
|
|
|
return nents;
|
|
}
|
|
|
|
static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
}
|
|
|
|
static int dma_direct_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline dma_addr_t dma_direct_map_page(struct device *dev,
|
|
struct page *page,
|
|
unsigned long offset,
|
|
size_t size,
|
|
enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
__dma_sync_page(page_to_phys(page), offset, size, direction);
|
|
return page_to_phys(page) + offset + get_dma_direct_offset(dev);
|
|
}
|
|
|
|
static inline void dma_direct_unmap_page(struct device *dev,
|
|
dma_addr_t dma_address,
|
|
size_t size,
|
|
enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
/* There is not necessary to do cache cleanup
|
|
*
|
|
* phys_to_virt is here because in __dma_sync_page is __virt_to_phys and
|
|
* dma_address is physical address
|
|
*/
|
|
__dma_sync_page(dma_address, 0 , size, direction);
|
|
}
|
|
|
|
struct dma_map_ops dma_direct_ops = {
|
|
.alloc_coherent = dma_direct_alloc_coherent,
|
|
.free_coherent = dma_direct_free_coherent,
|
|
.map_sg = dma_direct_map_sg,
|
|
.unmap_sg = dma_direct_unmap_sg,
|
|
.dma_supported = dma_direct_dma_supported,
|
|
.map_page = dma_direct_map_page,
|
|
.unmap_page = dma_direct_unmap_page,
|
|
};
|
|
EXPORT_SYMBOL(dma_direct_ops);
|
|
|
|
/* Number of entries preallocated for DMA-API debugging */
|
|
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
|
|
|
|
static int __init dma_init(void)
|
|
{
|
|
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
|
|
|
|
return 0;
|
|
}
|
|
fs_initcall(dma_init);
|