143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*
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* Implements the generic device dma API for microblaze and the pci
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*
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* Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009-2010 PetaLogix
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* This file is base on powerpc and x86 dma-mapping.h versions
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* Copyright (C) 2004 IBM
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*/
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#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
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#define _ASM_MICROBLAZE_DMA_MAPPING_H
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/*
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* See Documentation/DMA-API-HOWTO.txt and
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* Documentation/DMA-API.txt for documentation.
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*/
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#include <linux/types.h>
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#include <linux/cache.h>
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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 <linux/dma-attrs.h>
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#include <asm/io.h>
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#include <asm-generic/dma-coherent.h>
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#include <asm/cacheflush.h>
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#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
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#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
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#define __dma_free_coherent(size, addr) ((void)0)
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/*
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* Available generic sets of operations
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*/
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extern struct dma_map_ops dma_direct_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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return &dma_direct_ops;
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}
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static inline int dma_supported(struct device *dev, u64 mask)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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if (unlikely(!ops))
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return 0;
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if (!ops->dma_supported)
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return 1;
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return ops->dma_supported(dev, mask);
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}
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static inline int dma_set_mask(struct device *dev, u64 dma_mask)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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if (unlikely(ops == NULL))
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return -EIO;
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if (ops->set_dma_mask)
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return ops->set_dma_mask(dev, dma_mask);
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if (!dev->dma_mask || !dma_supported(dev, dma_mask))
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return -EIO;
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*dev->dma_mask = dma_mask;
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return 0;
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}
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#include <asm-generic/dma-mapping-common.h>
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static inline void __dma_sync(unsigned long paddr,
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size_t size, enum dma_data_direction direction)
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{
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switch (direction) {
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case DMA_TO_DEVICE:
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case DMA_BIDIRECTIONAL:
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flush_dcache_range(paddr, paddr + size);
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break;
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case DMA_FROM_DEVICE:
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invalidate_dcache_range(paddr, paddr + size);
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break;
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default:
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BUG();
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}
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}
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static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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debug_dma_mapping_error(dev, dma_addr);
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if (ops->mapping_error)
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return ops->mapping_error(dev, dma_addr);
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return (dma_addr == DMA_ERROR_CODE);
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}
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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
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#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
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static inline void *dma_alloc_attrs(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag,
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struct dma_attrs *attrs)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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void *memory;
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BUG_ON(!ops);
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memory = ops->alloc(dev, size, dma_handle, flag, attrs);
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debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
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return memory;
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}
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#define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL)
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static inline void dma_free_attrs(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t dma_handle,
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struct dma_attrs *attrs)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!ops);
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debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
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ops->free(dev, size, cpu_addr, dma_handle, attrs);
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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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BUG_ON(direction == DMA_NONE);
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__dma_sync(virt_to_phys(vaddr), size, (int)direction);
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}
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#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */
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