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Blackfin: dma-mapping.h: flesh out missing DMA mapping functions
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Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Barry Song authored and Mike Frysinger committed Dec 15, 2009
1 parent a00b4fe commit dd3b0e3
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Showing 3 changed files with 116 additions and 64 deletions.
121 changes: 98 additions & 23 deletions arch/blackfin/include/asm/dma-mapping.h
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Original file line number Diff line number Diff line change
Expand Up @@ -7,9 +7,9 @@
#ifndef _BLACKFIN_DMA_MAPPING_H
#define _BLACKFIN_DMA_MAPPING_H

#include <asm/scatterlist.h>
#include <asm/cacheflush.h>
struct scatterlist;

void dma_alloc_init(unsigned long start, unsigned long end);
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
Expand All @@ -20,22 +20,65 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
*/
#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)
#define dma_supported(d, m) (1)
#define dma_get_cache_alignment() (32)
#define dma_is_consistent(d, h) (1)

static inline
int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
static inline int
dma_set_mask(struct device *dev, u64 dma_mask)
{
if (!dev->dma_mask || !dma_supported(dev, dma_mask))
return -EIO;

*dev->dma_mask = dma_mask;

return 0;
}

static inline int
dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return 0;
}

extern void
__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
static inline void
_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
{
if (!__builtin_constant_p(dir)) {
__dma_sync(addr, size, dir);
return;
}

switch (dir) {
case DMA_NONE:
BUG();
case DMA_TO_DEVICE: /* writeback only */
flush_dcache_range(addr, addr + size);
break;
case DMA_FROM_DEVICE: /* invalidate only */
case DMA_BIDIRECTIONAL: /* flush and invalidate */
/* Blackfin has no dedicated invalidate (it includes a flush) */
invalidate_dcache_range(addr, addr + size);
break;
}
}

/*
* Map a single buffer of the indicated size for DMA in streaming mode.
* The 32-bit bus address to use is returned.
*
* Once the device is given the dma address, the device owns this memory
* until either pci_unmap_single or pci_dma_sync_single is performed.
*/
extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction);
static inline dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction dir)
{
_dma_sync((dma_addr_t)ptr, size, dir);
return (dma_addr_t) ptr;
}

static inline dma_addr_t
dma_map_page(struct device *dev, struct page *page,
Expand All @@ -53,8 +96,12 @@ dma_map_page(struct device *dev, struct page *page,
* After this call, reads by the cpu to the buffer are guarenteed to see
* whatever the device wrote there.
*/
extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction);
static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));
}

static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
Expand All @@ -80,38 +127,66 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
* the same here.
*/
extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction);
enum dma_data_direction dir);

/*
* Unmap a set of streaming mode DMA translations.
* Again, cpu read rules concerning calls here are the same as for
* pci_unmap_single() above.
*/
extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nhwentries, enum dma_data_direction direction);
static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nhwentries, enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));
}

static inline void dma_sync_single_for_cpu(struct device *dev,
dma_addr_t handle, size_t size,
enum dma_data_direction dir)
static inline void
dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
unsigned long offset, size_t size,
enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));
}

static inline void dma_sync_single_for_device(struct device *dev,
dma_addr_t handle, size_t size,
enum dma_data_direction dir)
static inline void
dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
unsigned long offset, size_t size,
enum dma_data_direction dir)
{
_dma_sync(handle + offset, size, dir);
}

static inline void dma_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sg,
int nents, enum dma_data_direction dir)
static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
enum dma_data_direction dir)
{
dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
}

static inline void dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sg,
int nents, enum dma_data_direction dir)
static inline void
dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
enum dma_data_direction dir)
{
dma_sync_single_range_for_device(dev, handle, 0, size, dir);
}

static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));
}

extern void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir);

static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir)
{
_dma_sync((dma_addr_t)vaddr, size, dir);
}

#endif /* _BLACKFIN_DMA_MAPPING_H */
5 changes: 1 addition & 4 deletions arch/blackfin/include/asm/dma.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,7 @@
#include <asm/atomic.h>
#include <asm/blackfin.h>
#include <asm/page.h>

#define MAX_DMA_ADDRESS PAGE_OFFSET
#include <asm-generic/dma.h>

/* DMA_CONFIG Masks */
#define DMAEN 0x0001 /* DMA Channel Enable */
Expand Down Expand Up @@ -257,8 +256,6 @@ static inline void enable_dma(unsigned int channel)
dma_ch[channel].regs->curr_y_count = 0;
dma_ch[channel].regs->cfg |= DMAEN;
}
void free_dma(unsigned int channel);
int request_dma(unsigned int channel, const char *device_id);
int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data);

static inline void dma_disable_irq(unsigned int channel)
Expand Down
54 changes: 17 additions & 37 deletions arch/blackfin/kernel/dma-mapping.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,17 +7,11 @@
*/

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/gfp.h>
#include <linux/string.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
#include <asm/bfin-global.h>
#include <asm/sections.h>

static spinlock_t dma_page_lock;
static unsigned long *dma_page;
Expand All @@ -26,7 +20,7 @@ static unsigned long dma_base;
static unsigned long dma_size;
static unsigned int dma_initialized;

void dma_alloc_init(unsigned long start, unsigned long end)
static void dma_alloc_init(unsigned long start, unsigned long end)
{
spin_lock_init(&dma_page_lock);
dma_initialized = 0;
Expand Down Expand Up @@ -93,7 +87,7 @@ static void __free_dma_pages(unsigned long addr, unsigned int pages)
}

void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t * dma_handle, gfp_t gfp)
dma_addr_t *dma_handle, gfp_t gfp)
{
void *ret;

Expand All @@ -117,52 +111,38 @@ dma_free_coherent(struct device *dev, size_t size, void *vaddr,
EXPORT_SYMBOL(dma_free_coherent);

/*
* Dummy functions defined for some existing drivers
* Streaming DMA mappings
*/

dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction)
void __dma_sync(dma_addr_t addr, size_t size,
enum dma_data_direction dir)
{
BUG_ON(direction == DMA_NONE);

invalidate_dcache_range((unsigned long)ptr,
(unsigned long)ptr + size);

return (dma_addr_t) ptr;
_dma_sync(addr, size, dir);
}
EXPORT_SYMBOL(dma_map_single);
EXPORT_SYMBOL(__dma_sync);

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++) {
sg->dma_address = (dma_addr_t) sg_virt(sg);

invalidate_dcache_range(sg_dma_address(sg),
sg_dma_address(sg) +
sg_dma_len(sg));
__dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
}

return nents;
}
EXPORT_SYMBOL(dma_map_sg);

void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
int nelems, enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
}
EXPORT_SYMBOL(dma_unmap_single);
int i;

void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nhwentries, enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
for (i = 0; i < nelems; i++, sg++) {
sg->dma_address = (dma_addr_t) sg_virt(sg);
__dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
}
}
EXPORT_SYMBOL(dma_unmap_sg);
EXPORT_SYMBOL(dma_sync_sg_for_device);

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