ea8c64ace8
phys_to_dma, dma_to_phys and dma_capable are helpers published by architecture code for use of swiotlb and xen-swiotlb only. Drivers are not supposed to use these directly, but use the DMA API instead. Move these to a new asm/dma-direct.h helper, included by a linux/dma-direct.h wrapper that provides the default linear mapping unless the architecture wants to override it. In the MIPS case the existing dma-coherent.h is reused for now as untangling it will take a bit of work. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Robin Murphy <robin.murphy@arm.com>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
|
|
*
|
|
*/
|
|
#ifndef __ASM_MACH_GENERIC_DMA_COHERENCE_H
|
|
#define __ASM_MACH_GENERIC_DMA_COHERENCE_H
|
|
|
|
struct device;
|
|
|
|
static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
|
|
size_t size)
|
|
{
|
|
return virt_to_phys(addr);
|
|
}
|
|
|
|
static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
|
|
struct page *page)
|
|
{
|
|
return page_to_phys(page);
|
|
}
|
|
|
|
static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
|
|
dma_addr_t dma_addr)
|
|
{
|
|
return dma_addr;
|
|
}
|
|
|
|
static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
|
|
size_t size, enum dma_data_direction direction)
|
|
{
|
|
}
|
|
|
|
static inline int plat_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
/*
|
|
* we fall back to GFP_DMA when the mask isn't all 1s,
|
|
* so we can't guarantee allocations that must be
|
|
* within a tighter range than GFP_DMA..
|
|
*/
|
|
if (mask < DMA_BIT_MASK(24))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline int plat_device_is_coherent(struct device *dev)
|
|
{
|
|
#ifdef CONFIG_DMA_PERDEV_COHERENT
|
|
return dev->archdata.dma_coherent;
|
|
#else
|
|
switch (coherentio) {
|
|
default:
|
|
case IO_COHERENCE_DEFAULT:
|
|
return hw_coherentio;
|
|
case IO_COHERENCE_ENABLED:
|
|
return 1;
|
|
case IO_COHERENCE_DISABLED:
|
|
return 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifndef plat_post_dma_flush
|
|
static inline void plat_post_dma_flush(struct device *dev)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */
|