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MIPS: Add DMA declare coherent memory support

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The ohci-sm501 driver requires dma_declare_coherent_memory().  It is used
by the driver's local memory allocation with dma_alloc_coherent().

Tested on TANBAC TB0287(VR4131 + SM501).

[Ralf: Fixed reject in dma-default.c and removed the entire #if 0'ed block
 in dma-mapping.h instead of just the #if 0.]

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Yoichi Yuasa 2009-06-04 00:16:04 +09:00 committed by Ralf Baechle
parent da0bac3341
commit f8ac04255d
3 changed files with 9 additions and 10 deletions
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1
arch/mips/Kconfig
View file

@ -1,6 +1,7 @@
config MIPS
bool
default y
select HAVE_GENERIC_DMA_COHERENT
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_ARCH_KGDB

11
arch/mips/include/asm/dma-mapping.h
View file

@ -3,6 +3,7 @@
#include <asm/scatterlist.h>
#include <asm/cache.h>
#include <asm-generic/dma-coherent.h>
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag);
@ -73,14 +74,4 @@ extern int dma_is_consistent(struct device *dev, dma_addr_t dma_addr);
extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
#if 0
#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
extern int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
dma_addr_t device_addr, size_t size, int flags);
extern void dma_release_declared_memory(struct device *dev);
extern void * dma_mark_declared_memory_occupied(struct device *dev,
dma_addr_t device_addr, size_t size);
#endif
#endif /* _ASM_DMA_MAPPING_H */

7
arch/mips/mm/dma-default.c
View file

@ -90,6 +90,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
{
void *ret;
if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
return ret;
gfp = massage_gfp_flags(dev, gfp);
ret = (void *) __get_free_pages(gfp, get_order(size));
@ -122,6 +125,10 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle)
{
unsigned long addr = (unsigned long) vaddr;
int order = get_order(size);
if (dma_release_from_coherent(dev, order, vaddr))
return;
plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);