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Merge branch 'mymerge' of ssh://ozlabs.org/home/sfr/kernel-sfr
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Paul Mackerras committed Nov 19, 2005
2 parents e535664 + 78b0973 commit 0e6850f
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Showing 3 changed files with 110 additions and 181 deletions.
138 changes: 93 additions & 45 deletions include/asm-ppc/dma-mapping.h → include/asm-powerpc/dma-mapping.h
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Original file line number Diff line number Diff line change
@@ -1,15 +1,22 @@
/*
* This is based on both include/asm-sh/dma-mapping.h and
* include/asm-ppc/pci.h
* Copyright (C) 2004 IBM
*
* Implements the generic device dma API for powerpc.
* the pci and vio busses
*/
#ifndef __ASM_PPC_DMA_MAPPING_H
#define __ASM_PPC_DMA_MAPPING_H
#ifndef _ASM_DMA_MAPPING_H
#define _ASM_DMA_MAPPING_H

#include <linux/config.h>
#include <linux/types.h>
#include <linux/cache.h>
/* need struct page definitions */
#include <linux/mm.h>
#include <asm/scatterlist.h>
#include <asm/io.h>
#include <asm/bug.h>

#define DMA_ERROR_CODE (~(dma_addr_t)0x0)

#ifdef CONFIG_NOT_COHERENT_CACHE
/*
Expand All @@ -24,29 +31,43 @@ 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);
#define dma_cache_inv(_start,_size) \
invalidate_dcache_range(_start, (_start + _size))
#define dma_cache_wback(_start,_size) \
clean_dcache_range(_start, (_start + _size))
#define dma_cache_wback_inv(_start,_size) \
flush_dcache_range(_start, (_start + _size))

#else /* ! CONFIG_NOT_COHERENT_CACHE */
/*
* Cache coherent cores.
*/

#define dma_cache_inv(_start,_size) do { } while (0)
#define dma_cache_wback(_start,_size) do { } while (0)
#define dma_cache_wback_inv(_start,_size) do { } while (0)

#define __dma_alloc_coherent(gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) do { } while (0)
#define __dma_sync(addr, size, rw) do { } while (0)
#define __dma_sync_page(pg, off, sz, rw) do { } while (0)

#endif /* ! CONFIG_NOT_COHERENT_CACHE */

#ifdef CONFIG_PPC64

extern int dma_supported(struct device *dev, u64 mask);
extern int dma_set_mask(struct device *dev, u64 dma_mask);
extern void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag);
extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle);
extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
size_t size, enum dma_data_direction direction);
extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction direction);
extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction);
extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
size_t size, enum dma_data_direction direction);
extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction);
extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nhwentries, enum dma_data_direction direction);

#else /* CONFIG_PPC64 */

#define dma_supported(dev, mask) (1)

static inline int dma_set_mask(struct device *dev, u64 dma_mask)
Expand Down Expand Up @@ -144,29 +165,27 @@ dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
/* We don't do anything here. */
#define dma_unmap_sg(dev, sg, nents, dir) do { } while (0)

static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size,
enum dma_data_direction direction)
#endif /* CONFIG_PPC64 */

static inline 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);

__dma_sync(bus_to_virt(dma_handle), size, direction);
}

static inline void
dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
size_t size,
enum dma_data_direction direction)
static inline 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);

__dma_sync(bus_to_virt(dma_handle), size, direction);
}

static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
static inline void dma_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
int i;

Expand All @@ -176,9 +195,9 @@ dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
__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,
enum dma_data_direction direction)
static inline void dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
int i;

Expand All @@ -188,6 +207,15 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
}

static inline int dma_mapping_error(dma_addr_t dma_addr)
{
#ifdef CONFIG_PPC64
return (dma_addr == DMA_ERROR_CODE);
#else
return 0;
#endif
}

#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#ifdef CONFIG_NOT_COHERENT_CACHE
Expand All @@ -198,40 +226,60 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,

static inline int dma_get_cache_alignment(void)
{
#ifdef CONFIG_PPC64
/* no easy way to get cache size on all processors, so return
* the maximum possible, to be safe */
return (1 << L1_CACHE_SHIFT_MAX);
#else
/*
* Each processor family will define its own L1_CACHE_SHIFT,
* L1_CACHE_BYTES wraps to this, so this is always safe.
*/
return L1_CACHE_BYTES;
#endif
}

static inline 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)
static inline 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)
{
/* just sync everything for now */
dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
}

static inline 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)
static inline 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)
{
/* just sync everything for now */
dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
}

static inline void dma_cache_sync(void *vaddr, size_t size,
enum dma_data_direction direction)
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
__dma_sync(vaddr, size, (int)direction);
}

static inline int dma_mapping_error(dma_addr_t dma_addr)
{
return 0;
}

#endif /* __ASM_PPC_DMA_MAPPING_H */
/*
* 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 (*dac_dma_supported)(struct device *dev, u64 mask);
};

#endif /* _ASM_DMA_MAPPING_H */
17 changes: 17 additions & 0 deletions include/asm-ppc/io.h
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Original file line number Diff line number Diff line change
Expand Up @@ -545,6 +545,23 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
#include <asm/mpc8260_pci9.h>
#endif

#ifdef CONFIG_NOT_COHERENT_CACHE

#define dma_cache_inv(_start,_size) \
invalidate_dcache_range(_start, (_start + _size))
#define dma_cache_wback(_start,_size) \
clean_dcache_range(_start, (_start + _size))
#define dma_cache_wback_inv(_start,_size) \
flush_dcache_range(_start, (_start + _size))

#else

#define dma_cache_inv(_start,_size) do { } while (0)
#define dma_cache_wback(_start,_size) do { } while (0)
#define dma_cache_wback_inv(_start,_size) do { } while (0)

#endif

/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
Expand Down
136 changes: 0 additions & 136 deletions include/asm-ppc64/dma-mapping.h
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