blob: fdc3331b63fb954240e9f2a150a6f8f2d25e8a3b [file] [log] [blame]
#ifndef __BACKPORT_LINUX_DMA_MAPPING_H
#define __BACKPORT_LINUX_DMA_MAPPING_H
#include_next <linux/dma-mapping.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
#define dma_zalloc_coherent LINUX_BACKPORT(dma_zalloc_coherent)
static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
if (ret)
memset(ret, 0, size);
return ret;
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0)
/*
* Set both the DMA mask and the coherent DMA mask to the same thing.
* Note that we don't check the return value from dma_set_coherent_mask()
* as the DMA API guarantees that the coherent DMA mask can be set to
* the same or smaller than the streaming DMA mask.
*/
#define dma_set_mask_and_coherent LINUX_BACKPORT(dma_set_mask_and_coherent)
static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
{
int rc = dma_set_mask(dev, mask);
if (rc == 0)
dma_set_coherent_mask(dev, mask);
return rc;
}
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0) */
#endif /* __BACKPORT_LINUX_DMA_MAPPING_H */