|
@@ -6,149 +6,6 @@
|
|
|
*/
|
|
|
#ifndef _ASM_DMA_MAPPING_H
|
|
|
#define _ASM_DMA_MAPPING_H
|
|
|
-#ifdef __KERNEL__
|
|
|
-
|
|
|
-#include <linux/types.h>
|
|
|
-#include <linux/cache.h>
|
|
|
-/* need struct page definitions */
|
|
|
-#include <linux/mm.h>
|
|
|
-#include <linux/scatterlist.h>
|
|
|
-#include <asm/io.h>
|
|
|
-
|
|
|
-#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
|
|
|
-
|
|
|
-#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
|
-/*
|
|
|
- * DMA-consistent mapping functions for PowerPCs that don't support
|
|
|
- * cache snooping. These allocate/free a region of uncached mapped
|
|
|
- * memory space for use with DMA devices. Alternatively, you could
|
|
|
- * allocate the space "normally" and use the cache management functions
|
|
|
- * to ensure it is consistent.
|
|
|
- */
|
|
|
-extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
|
|
|
-extern void __dma_free_coherent(size_t size, void *vaddr);
|
|
|
-extern void __dma_sync(void *vaddr, size_t size, int direction);
|
|
|
-extern void __dma_sync_page(struct page *page, unsigned long offset,
|
|
|
- size_t size, int direction);
|
|
|
-
|
|
|
-#else /* ! CONFIG_NOT_COHERENT_CACHE */
|
|
|
-/*
|
|
|
- * Cache coherent cores.
|
|
|
- */
|
|
|
-
|
|
|
-#define __dma_alloc_coherent(gfp, size, handle) NULL
|
|
|
-#define __dma_free_coherent(size, addr) ((void)0)
|
|
|
-#define __dma_sync(addr, size, rw) ((void)0)
|
|
|
-#define __dma_sync_page(pg, off, sz, rw) ((void)0)
|
|
|
-
|
|
|
-#endif /* ! CONFIG_NOT_COHERENT_CACHE */
|
|
|
-
|
|
|
-#ifdef CONFIG_PPC64
|
|
|
-/*
|
|
|
- * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
|
|
|
- */
|
|
|
-struct dma_mapping_ops {
|
|
|
- void * (*alloc_coherent)(struct device *dev, size_t size,
|
|
|
- dma_addr_t *dma_handle, gfp_t flag);
|
|
|
- void (*free_coherent)(struct device *dev, size_t size,
|
|
|
- void *vaddr, dma_addr_t dma_handle);
|
|
|
- dma_addr_t (*map_single)(struct device *dev, void *ptr,
|
|
|
- size_t size, enum dma_data_direction direction);
|
|
|
- void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
|
|
|
- size_t size, enum dma_data_direction direction);
|
|
|
- int (*map_sg)(struct device *dev, struct scatterlist *sg,
|
|
|
- int nents, enum dma_data_direction direction);
|
|
|
- void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
|
|
|
- int nents, enum dma_data_direction direction);
|
|
|
- int (*dma_supported)(struct device *dev, u64 mask);
|
|
|
- int (*set_dma_mask)(struct device *dev, u64 dma_mask);
|
|
|
-};
|
|
|
-
|
|
|
-static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
|
|
|
-{
|
|
|
- /* We don't handle the NULL dev case for ISA for now. We could
|
|
|
- * do it via an out of line call but it is not needed for now. The
|
|
|
- * only ISA DMA device we support is the floppy and we have a hack
|
|
|
- * in the floppy driver directly to get a device for us.
|
|
|
- */
|
|
|
- if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
|
|
|
- return NULL;
|
|
|
- return dev->archdata.dma_ops;
|
|
|
-}
|
|
|
-
|
|
|
-static inline int dma_supported(struct device *dev, u64 mask)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- if (unlikely(dma_ops == NULL))
|
|
|
- return 0;
|
|
|
- if (dma_ops->dma_supported == NULL)
|
|
|
- return 1;
|
|
|
- return dma_ops->dma_supported(dev, mask);
|
|
|
-}
|
|
|
-
|
|
|
-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- if (unlikely(dma_ops == NULL))
|
|
|
- return -EIO;
|
|
|
- if (dma_ops->set_dma_mask != NULL)
|
|
|
- return dma_ops->set_dma_mask(dev, dma_mask);
|
|
|
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
|
|
|
- return -EIO;
|
|
|
- *dev->dma_mask = dma_mask;
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static inline void *dma_alloc_coherent(struct device *dev, size_t size,
|
|
|
- dma_addr_t *dma_handle, gfp_t flag)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- BUG_ON(!dma_ops);
|
|
|
- return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
|
|
|
-}
|
|
|
-
|
|
|
-static inline void dma_free_coherent(struct device *dev, size_t size,
|
|
|
- void *cpu_addr, dma_addr_t dma_handle)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- BUG_ON(!dma_ops);
|
|
|
- dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
|
|
|
-}
|
|
|
-
|
|
|
-static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
|
|
|
- size_t size,
|
|
|
- enum dma_data_direction direction)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- BUG_ON(!dma_ops);
|
|
|
- return dma_ops->map_single(dev, cpu_addr, size, direction);
|
|
|
-}
|
|
|
-
|
|
|
-static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
|
|
|
- size_t size,
|
|
|
- enum dma_data_direction direction)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- BUG_ON(!dma_ops);
|
|
|
- dma_ops->unmap_single(dev, dma_addr, size, direction);
|
|
|
-}
|
|
|
-
|
|
|
-static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
|
|
|
- unsigned long offset, size_t size,
|
|
|
- enum dma_data_direction direction)
|
|
|
-{
|
|
|
- struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
|
|
|
-
|
|
|
- BUG_ON(!dma_ops);
|
|
|
- return dma_ops->map_single(dev, page_address(page) + offset, size,
|
|
|
- direction);
|
|
|
-}
|
|
|
|
|
|
static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
|
|
|
size_t size,
|
|
@@ -276,14 +133,15 @@ static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
|
|
|
}
|
|
|
|
|
|
static inline int
|
|
|
-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
|
|
|
+dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
|
|
|
enum dma_data_direction direction)
|
|
|
{
|
|
|
+ struct scatterlist *sg;
|
|
|
int i;
|
|
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
|
|
- for (i = 0; i < nents; i++, sg++) {
|
|
|
+ for_each_sg(sgl, sg, nents, i) {
|
|
|
BUG_ON(!sg->page);
|
|
|
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
|
|
|
sg->dma_address = page_to_bus(sg->page) + sg->offset;
|
|
@@ -318,26 +176,28 @@ static inline void dma_sync_single_for_device(struct device *dev,
|
|
|
}
|
|
|
|
|
|
static inline void dma_sync_sg_for_cpu(struct device *dev,
|
|
|
- struct scatterlist *sg, int nents,
|
|
|
+ struct scatterlist *sgl, int nents,
|
|
|
enum dma_data_direction direction)
|
|
|
{
|
|
|
+ struct scatterlist *sg;
|
|
|
int i;
|
|
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
|
|
- for (i = 0; i < nents; i++, sg++)
|
|
|
+ for_each_sg(sgl, sg, nents, i)
|
|
|
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
|
|
|
}
|
|
|
|
|
|
static inline void dma_sync_sg_for_device(struct device *dev,
|
|
|
- struct scatterlist *sg, int nents,
|
|
|
+ struct scatterlist *sgl, int nents,
|
|
|
enum dma_data_direction direction)
|
|
|
{
|
|
|
+ struct scatterlist *sg;
|
|
|
int i;
|
|
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
|
|
- for (i = 0; i < nents; i++, sg++)
|
|
|
+ for_each_sg(sgl, sg, nents, i)
|
|
|
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
|
|
|
}
|
|
|
|