mirror of https://gitee.com/openkylin/linux.git
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
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*
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*/
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#ifndef __ASM_MACH_IP27_DMA_COHERENCE_H
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#define __ASM_MACH_IP27_DMA_COHERENCE_H
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#include <asm/pci/bridge.h>
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#define pdev_to_baddr(pdev, addr) \
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(BRIDGE_CONTROLLER(pdev->bus)->baddr + (addr))
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#define dev_to_baddr(dev, addr) \
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pdev_to_baddr(to_pci_dev(dev), (addr))
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struct device;
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static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
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size_t size)
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{
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dma_addr_t pa = dev_to_baddr(dev, virt_to_phys(addr));
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return pa;
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}
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static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
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struct page *page)
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{
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dma_addr_t pa = dev_to_baddr(dev, page_to_phys(page));
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return pa;
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}
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static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
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dma_addr_t dma_addr)
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{
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return dma_addr & ~(0xffUL << 56);
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}
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static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
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size_t size, enum dma_data_direction direction)
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{
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}
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static inline int plat_dma_supported(struct device *dev, u64 mask)
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{
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/*
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* we fall back to GFP_DMA when the mask isn't all 1s,
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* so we can't guarantee allocations that must be
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* within a tighter range than GFP_DMA..
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*/
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if (mask < DMA_BIT_MASK(24))
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return 0;
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return 1;
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}
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static inline int plat_device_is_coherent(struct device *dev)
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{
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return 1; /* IP27 non-cohernet mode is unsupported */
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}
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#endif /* __ASM_MACH_IP27_DMA_COHERENCE_H */
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