mirror of https://gitee.com/openkylin/linux.git
118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_DMA_MAPPING_H
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#define _ASM_TILE_DMA_MAPPING_H
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/cache.h>
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#include <linux/io.h>
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#ifdef __tilegx__
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#define ARCH_HAS_DMA_GET_REQUIRED_MASK
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#endif
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extern struct dma_map_ops *tile_dma_map_ops;
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extern struct dma_map_ops *gx_pci_dma_map_ops;
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extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
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extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
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static inline struct dma_map_ops *get_dma_ops(struct device *dev)
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{
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if (dev && dev->archdata.dma_ops)
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return dev->archdata.dma_ops;
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else
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return tile_dma_map_ops;
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}
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static inline dma_addr_t get_dma_offset(struct device *dev)
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{
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return dev->archdata.dma_offset;
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}
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static inline void set_dma_offset(struct device *dev, dma_addr_t off)
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{
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dev->archdata.dma_offset = off;
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}
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return paddr;
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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return daddr;
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}
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static inline void dma_mark_clean(void *addr, size_t size) {}
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static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
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{
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dev->archdata.dma_ops = ops;
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}
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (!dev->dma_mask)
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return 0;
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return addr + size - 1 <= *dev->dma_mask;
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}
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#define HAVE_ARCH_DMA_SET_MASK 1
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#include <asm-generic/dma-mapping-common.h>
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static inline int
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dma_set_mask(struct device *dev, u64 mask)
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{
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struct dma_map_ops *dma_ops = get_dma_ops(dev);
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/*
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* For PCI devices with 64-bit DMA addressing capability, promote
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* the dma_ops to hybrid, with the consistent memory DMA space limited
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* to 32-bit. For 32-bit capable devices, limit the streaming DMA
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* address range to max_direct_dma_addr.
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*/
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if (dma_ops == gx_pci_dma_map_ops ||
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dma_ops == gx_hybrid_pci_dma_map_ops ||
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dma_ops == gx_legacy_pci_dma_map_ops) {
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if (mask == DMA_BIT_MASK(64) &&
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dma_ops == gx_legacy_pci_dma_map_ops)
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set_dma_ops(dev, gx_hybrid_pci_dma_map_ops);
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else if (mask > dev->archdata.max_direct_dma_addr)
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mask = dev->archdata.max_direct_dma_addr;
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}
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if (!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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/*
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* dma_alloc_noncoherent() is #defined to return coherent memory,
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* so there's no need to do any flushing here.
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*/
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static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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}
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#endif /* _ASM_TILE_DMA_MAPPING_H */
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