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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_DMA_DIRECT_H
#define __ASM_DMA_DIRECT_H
#include <linux/jump_label.h>
#include <linux/swiotlb.h>
#include <asm/cache.h>
DECLARE_STATIC_KEY_FALSE(swiotlb_noncoherent_bounce);
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
dma_addr_t dev_addr = (dma_addr_t)paddr;
return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
{
phys_addr_t paddr = (phys_addr_t)dev_addr;
return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
}
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
return false;
/*
* Force swiotlb buffer bouncing when ARCH_DMA_MINALIGN < CWG. The
* swiotlb bounce buffers are aligned to (1 << IO_TLB_SHIFT).
*/
if (static_branch_unlikely(&swiotlb_noncoherent_bounce) &&
!is_device_dma_coherent(dev) &&
!is_swiotlb_buffer(dma_to_phys(dev, addr)))
return false;
return addr + size - 1 <= *dev->dma_mask;
}
#endif /* __ASM_DMA_DIRECT_H */
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