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#ifndef __LINUX_CMA_H
#define __LINUX_CMA_H
#ifdef __KERNEL__
struct cma;
struct page;
struct device;
#ifdef CONFIG_DMA_CMA
#define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS)
extern struct cma *dma_contiguous_default_area;
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;
}
static inline void dma_contiguous_set_default(struct cma *cma)
{
dma_contiguous_default_area = cma;
}
void dma_contiguous_reserve(phys_addr_t addr_limit);
int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
phys_addr_t limit, struct cma **res_cma);
static inline int dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit)
{
struct cma *cma;
int ret;
ret = dma_contiguous_reserve_area(size, base, limit, &cma);
if (ret == 0)
dev_set_cma_area(dev, cma);
return ret;
}
struct page *dma_alloc_from_contiguous(struct device *dev, int count,
unsigned int order);
bool dma_release_from_contiguous(struct device *dev, struct page *pages,
int count);
#else
#define MAX_CMA_AREAS (0)
static inline struct cma *dev_get_cma_area(struct device *dev)
{
return NULL;
}
static inline void dev_set_cma_area(struct device *dev, struct cma *cma) { }
static inline void dma_contiguous_set_default(struct cma *cma) { }
static inline void dma_contiguous_reserve(phys_addr_t limit) { }
static inline int dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
phys_addr_t limit, struct cma **res_cma) {
return -ENOSYS;
}
static inline
int dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit)
{
return -ENOSYS;
}
static inline
struct page *dma_alloc_from_contiguous(struct device *dev, int count,
unsigned int order)
{
return NULL;
}
static inline
bool dma_release_from_contiguous(struct device *dev, struct page *pages,
int count)
{
return false;
}
#endif
#endif
#endif
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