68005b67d1
Now that we've switched all the powerpc nommu and swiotlb methods to use the generic dma_direct_* calls we can remove these ops vectors entirely and rely on the common direct mapping bypass that avoids indirect function calls entirely. This also allows to remove a whole lot of boilerplate code related to setting up these operations. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2004 IBM
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*
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* Implements the generic device dma API for powerpc.
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* the pci and vio busses
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*/
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#ifndef _ASM_DMA_MAPPING_H
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#define _ASM_DMA_MAPPING_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/cache.h>
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/* need struct page definitions */
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-debug.h>
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#include <asm/io.h>
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#include <asm/swiotlb.h>
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static inline unsigned long device_to_mask(struct device *dev)
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{
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if (dev->dma_mask && *dev->dma_mask)
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return *dev->dma_mask;
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/* Assume devices without mask can take 32 bit addresses */
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return 0xfffffffful;
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}
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/*
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* Available generic sets of operations
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*/
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#ifdef CONFIG_PPC64
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extern const struct dma_map_ops dma_iommu_ops;
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#endif
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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/* We don't handle the NULL dev case for ISA for now. We could
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* do it via an out of line call but it is not needed for now. The
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* only ISA DMA device we support is the floppy and we have a hack
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* in the floppy driver directly to get a device for us.
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*/
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return NULL;
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}
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/*
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* get_dma_offset()
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*
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* Get the dma offset on configurations where the dma address can be determined
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* from the physical address by looking at a simple offset. Direct dma and
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* swiotlb use this function, but it is typically not used by implementations
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* with an iommu.
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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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if (dev)
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return dev->archdata.dma_offset;
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return PCI_DRAM_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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if (dev)
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dev->archdata.dma_offset = off;
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_DMA_MAPPING_H */
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