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drivers: dma-contiguous: clean source code and prepare for device tree

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This patch cleans the initialization of dma contiguous framework. The
all-in-one dma_declare_contiguous() function is now separated into
dma_contiguous_reserve_area() which only steals the the memory from
memblock allocator and dma_contiguous_add_device() function, which
assigns given device to the specified reserved memory area. This improves
the flexibility in defining contiguous memory areas and assigning device
to them, because now it is possible to assign more than one device to
the given contiguous memory area. Such split in initialization procedure
is also required for upcoming device tree support.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Tomasz Figa <t.figa@samsung.com>
This commit is contained in:
Marek Szyprowski
2013-07-29 14:31:45 +02:00
parent f7d8f1e9cb
commit a254738039
6 changed files with 105 additions and 108 deletions
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28
include/asm-generic/dma-contiguous.h
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@@ -1,28 +0,0 @@
#ifndef ASM_DMA_CONTIGUOUS_H
#define ASM_DMA_CONTIGUOUS_H
#ifdef __KERNEL__
#ifdef CONFIG_CMA
#include <linux/device.h>
#include <linux/dma-contiguous.h>
static inline struct cma *dev_get_cma_area(struct device *dev)
{
if (dev && dev->cma_area)
return dev->cma_area;
return dma_contiguous_default_area;
}
static inline void dev_set_cma_area(struct device *dev, struct cma *cma)
{
if (dev)
dev->cma_area = cma;
if (!dev && !dma_contiguous_default_area)
dma_contiguous_default_area = cma;
}
#endif
#endif
#endif