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dma_supported() is supposed to indicate whether the system can support the DMA mask it was passed, which depends on the maximal address which can be returned for DMA allocations. If the mask is smaller than that, we are unable to guarantee that the driver can reliably obtain suitable memory. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
432 lines
14 KiB
C
432 lines
14 KiB
C
#ifndef ASMARM_DMA_MAPPING_H
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#define ASMARM_DMA_MAPPING_H
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#ifdef __KERNEL__
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#include <linux/mm_types.h>
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#include <linux/scatterlist.h>
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#include <asm-generic/dma-coherent.h>
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#include <asm/memory.h>
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/*
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* page_to_dma/dma_to_virt/virt_to_dma are architecture private functions
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* used internally by the DMA-mapping API to provide DMA addresses. They
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* must not be used by drivers.
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*/
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#ifndef __arch_page_to_dma
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static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
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{
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return (dma_addr_t)__virt_to_bus((unsigned long)page_address(page));
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}
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static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
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{
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return (void *)__bus_to_virt(addr);
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}
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static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
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{
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return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
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}
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#else
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static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
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{
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return __arch_page_to_dma(dev, page);
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}
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static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
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{
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return __arch_dma_to_virt(dev, addr);
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}
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static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
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{
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return __arch_virt_to_dma(dev, addr);
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}
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#endif
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/*
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* DMA-consistent mapping functions. These allocate/free a region of
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* uncached, unwrite-buffered mapped memory space for use with DMA
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* devices. This is the "generic" version. The PCI specific version
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* is in pci.h
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*
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* Note: Drivers should NOT use this function directly, as it will break
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* platforms with CONFIG_DMABOUNCE.
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* Use the driver DMA support - see dma-mapping.h (dma_sync_*)
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*/
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extern void dma_cache_maint(const void *kaddr, size_t size, int rw);
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/*
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* Return whether the given device DMA address mask can be supported
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* properly. For example, if your device can only drive the low 24-bits
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* during bus mastering, then you would pass 0x00ffffff as the mask
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* to this function.
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*
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* FIXME: This should really be a platform specific issue - we should
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* return false if GFP_DMA allocations may not satisfy the supplied 'mask'.
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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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if (mask < ISA_DMA_THRESHOLD)
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return 0;
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return 1;
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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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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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static inline int dma_get_cache_alignment(void)
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{
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return 32;
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}
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static inline int dma_is_consistent(struct device *dev, dma_addr_t handle)
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{
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return !!arch_is_coherent();
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}
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/*
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* DMA errors are defined by all-bits-set in the DMA address.
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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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return dma_addr == ~0;
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}
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/*
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* Dummy noncoherent implementation. We don't provide a dma_cache_sync
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* function so drivers using this API are highlighted with build warnings.
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*/
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static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t *handle, gfp_t gfp)
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{
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return NULL;
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}
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static inline void dma_free_noncoherent(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t handle)
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{
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}
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/**
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* dma_alloc_coherent - allocate consistent memory for DMA
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @size: required memory size
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* @handle: bus-specific DMA address
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*
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* Allocate some uncached, unbuffered memory for a device for
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* performing DMA. This function allocates pages, and will
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* return the CPU-viewed address, and sets @handle to be the
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* device-viewed address.
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*/
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extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
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/**
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* dma_free_coherent - free memory allocated by dma_alloc_coherent
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @size: size of memory originally requested in dma_alloc_coherent
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* @cpu_addr: CPU-view address returned from dma_alloc_coherent
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* @handle: device-view address returned from dma_alloc_coherent
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*
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* Free (and unmap) a DMA buffer previously allocated by
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* dma_alloc_coherent().
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*
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* References to memory and mappings associated with cpu_addr/handle
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* during and after this call executing are illegal.
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*/
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extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
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/**
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* dma_mmap_coherent - map a coherent DMA allocation into user space
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @vma: vm_area_struct describing requested user mapping
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* @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
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* @handle: device-view address returned from dma_alloc_coherent
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* @size: size of memory originally requested in dma_alloc_coherent
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*
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* Map a coherent DMA buffer previously allocated by dma_alloc_coherent
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* into user space. The coherent DMA buffer must not be freed by the
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* driver until the user space mapping has been released.
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*/
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int dma_mmap_coherent(struct device *, struct vm_area_struct *,
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void *, dma_addr_t, size_t);
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/**
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* dma_alloc_writecombine - allocate writecombining memory for DMA
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @size: required memory size
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* @handle: bus-specific DMA address
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*
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* Allocate some uncached, buffered memory for a device for
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* performing DMA. This function allocates pages, and will
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* return the CPU-viewed address, and sets @handle to be the
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* device-viewed address.
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*/
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extern void *dma_alloc_writecombine(struct device *, size_t, dma_addr_t *,
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gfp_t);
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#define dma_free_writecombine(dev,size,cpu_addr,handle) \
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dma_free_coherent(dev,size,cpu_addr,handle)
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int dma_mmap_writecombine(struct device *, struct vm_area_struct *,
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void *, dma_addr_t, size_t);
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#ifdef CONFIG_DMABOUNCE
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/*
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* For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
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* and utilize bounce buffers as needed to work around limited DMA windows.
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*
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* On the SA-1111, a bug limits DMA to only certain regions of RAM.
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* On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
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* On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
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*
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* The following are helper functions used by the dmabounce subystem
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*
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*/
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/**
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* dmabounce_register_dev
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*
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* @dev: valid struct device pointer
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* @small_buf_size: size of buffers to use with small buffer pool
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* @large_buf_size: size of buffers to use with large buffer pool (can be 0)
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*
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* This function should be called by low-level platform code to register
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* a device as requireing DMA buffer bouncing. The function will allocate
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* appropriate DMA pools for the device.
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*
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*/
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extern int dmabounce_register_dev(struct device *, unsigned long,
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unsigned long);
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/**
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* dmabounce_unregister_dev
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*
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* @dev: valid struct device pointer
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*
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* This function should be called by low-level platform code when device
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* that was previously registered with dmabounce_register_dev is removed
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* from the system.
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*
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*/
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extern void dmabounce_unregister_dev(struct device *);
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/**
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* dma_needs_bounce
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*
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* @dev: valid struct device pointer
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* @dma_handle: dma_handle of unbounced buffer
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* @size: size of region being mapped
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*
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* Platforms that utilize the dmabounce mechanism must implement
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* this function.
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*
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* The dmabounce routines call this function whenever a dma-mapping
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* is requested to determine whether a given buffer needs to be bounced
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* or not. The function must return 0 if the buffer is OK for
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* DMA access and 1 if the buffer needs to be bounced.
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*
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*/
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extern int dma_needs_bounce(struct device*, dma_addr_t, size_t);
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/*
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* The DMA API, implemented by dmabounce.c. See below for descriptions.
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*/
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extern dma_addr_t dma_map_single(struct device *, void *, size_t,
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enum dma_data_direction);
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extern dma_addr_t dma_map_page(struct device *, struct page *,
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unsigned long, size_t, enum dma_data_direction);
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extern void dma_unmap_single(struct device *, dma_addr_t, size_t,
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enum dma_data_direction);
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/*
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* Private functions
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*/
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int dmabounce_sync_for_cpu(struct device *, dma_addr_t, unsigned long,
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size_t, enum dma_data_direction);
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int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
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size_t, enum dma_data_direction);
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#else
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static inline int dmabounce_sync_for_cpu(struct device *d, dma_addr_t addr,
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unsigned long offset, size_t size, enum dma_data_direction dir)
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{
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return 1;
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}
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static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
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unsigned long offset, size_t size, enum dma_data_direction dir)
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{
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return 1;
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}
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/**
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* dma_map_single - map a single buffer for streaming DMA
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @cpu_addr: CPU direct mapped address of buffer
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* @size: size of buffer to map
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* @dir: DMA transfer direction
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*
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* Ensure that any data held in the cache is appropriately discarded
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* or written back.
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*
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* The device owns this memory once this call has completed. The CPU
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* can regain ownership by calling dma_unmap_single() or
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* dma_sync_single_for_cpu().
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*/
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static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
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size_t size, enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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if (!arch_is_coherent())
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dma_cache_maint(cpu_addr, size, dir);
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return virt_to_dma(dev, cpu_addr);
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}
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/**
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* dma_map_page - map a portion of a page for streaming DMA
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @page: page that buffer resides in
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* @offset: offset into page for start of buffer
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* @size: size of buffer to map
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* @dir: DMA transfer direction
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*
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* Ensure that any data held in the cache is appropriately discarded
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* or written back.
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*
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* The device owns this memory once this call has completed. The CPU
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* can regain ownership by calling dma_unmap_page().
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*/
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static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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if (!arch_is_coherent())
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dma_cache_maint(page_address(page) + offset, size, dir);
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return page_to_dma(dev, page) + offset;
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}
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/**
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* dma_unmap_single - unmap a single buffer previously mapped
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @handle: DMA address of buffer
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* @size: size of buffer (same as passed to dma_map_single)
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* @dir: DMA transfer direction (same as passed to dma_map_single)
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*
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* Unmap a single streaming mode DMA translation. The handle and size
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* must match what was provided in the previous dma_map_single() call.
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* All other usages are undefined.
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*
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* After this call, reads by the CPU to the buffer are guaranteed to see
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* whatever the device wrote there.
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*/
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static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir)
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{
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/* nothing to do */
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}
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#endif /* CONFIG_DMABOUNCE */
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/**
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* dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @handle: DMA address of buffer
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* @size: size of buffer (same as passed to dma_map_page)
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* @dir: DMA transfer direction (same as passed to dma_map_page)
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*
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* Unmap a page streaming mode DMA translation. The handle and size
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* must match what was provided in the previous dma_map_page() call.
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* All other usages are undefined.
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*
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* After this call, reads by the CPU to the buffer are guaranteed to see
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* whatever the device wrote there.
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*/
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static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir)
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{
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dma_unmap_single(dev, handle, size, dir);
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}
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/**
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* dma_sync_single_range_for_cpu
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @handle: DMA address of buffer
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* @offset: offset of region to start sync
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* @size: size of region to sync
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* @dir: DMA transfer direction (same as passed to dma_map_single)
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*
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* Make physical memory consistent for a single streaming mode DMA
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* translation after a transfer.
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*
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* If you perform a dma_map_single() but wish to interrogate the
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* buffer using the cpu, yet do not wish to teardown the PCI dma
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* mapping, you must call this function before doing so. At the
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* next point you give the PCI dma address back to the card, you
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* must first the perform a dma_sync_for_device, and then the
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* device again owns the buffer.
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*/
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static inline void dma_sync_single_range_for_cpu(struct device *dev,
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dma_addr_t handle, unsigned long offset, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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dmabounce_sync_for_cpu(dev, handle, offset, size, dir);
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}
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static inline void dma_sync_single_range_for_device(struct device *dev,
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dma_addr_t handle, unsigned long offset, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
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return;
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if (!arch_is_coherent())
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dma_cache_maint(dma_to_virt(dev, handle) + offset, size, dir);
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}
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static inline void dma_sync_single_for_cpu(struct device *dev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
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}
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static inline void dma_sync_single_for_device(struct device *dev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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dma_sync_single_range_for_device(dev, handle, 0, size, dir);
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}
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/*
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* The scatter list versions of the above methods.
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*/
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extern int dma_map_sg(struct device *, struct scatterlist *, int,
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enum dma_data_direction);
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extern void dma_unmap_sg(struct device *, struct scatterlist *, int,
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enum dma_data_direction);
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extern void dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
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enum dma_data_direction);
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extern void dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
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enum dma_data_direction);
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#endif /* __KERNEL__ */
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#endif
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