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@@ -104,15 +104,14 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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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 *
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-dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
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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
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-dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,
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- dma_addr_t handle)
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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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@@ -127,8 +126,7 @@ dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,
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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 *
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-dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp);
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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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@@ -143,9 +141,7 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gf
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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
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-dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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- dma_addr_t handle);
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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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@@ -159,8 +155,8 @@ dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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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 *dev, struct vm_area_struct *vma,
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- void *cpu_addr, dma_addr_t handle, size_t size);
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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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@@ -174,14 +170,94 @@ int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
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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 *
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-dma_alloc_writecombine(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp);
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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 *dev, struct vm_area_struct *vma,
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- void *cpu_addr, dma_addr_t handle, size_t size);
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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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+
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+
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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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+/**
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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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+/**
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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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+/**
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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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+/*
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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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+/*
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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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+#define dmabounce_sync_for_cpu(dev,dma,off,sz,dir) (1)
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+#define dmabounce_sync_for_device(dev,dma,off,sz,dir) (1)
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/**
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@@ -198,19 +274,16 @@ int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
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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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-#ifndef CONFIG_DMABOUNCE
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-static inline dma_addr_t
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-dma_map_single(struct device *dev, void *cpu_addr, size_t size,
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- enum dma_data_direction dir)
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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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+
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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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-#else
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-extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_direction);
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-#endif
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/**
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* dma_map_page - map a portion of a page for streaming DMA
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@@ -224,23 +297,25 @@ extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_d
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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() or
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- * dma_sync_single_for_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
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-dma_map_page(struct device *dev, struct page *page,
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- unsigned long offset, size_t size,
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- enum dma_data_direction dir)
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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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- return dma_map_single(dev, page_address(page) + offset, size, dir);
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+ BUG_ON(!valid_dma_direction(dir));
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+
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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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+
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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 to map
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- * @dir: DMA transfer direction
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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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@@ -249,107 +324,33 @@ dma_map_page(struct device *dev, struct page *page,
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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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-#ifndef CONFIG_DMABOUNCE
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-static inline void
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-dma_unmap_single(struct device *dev, dma_addr_t handle, size_t size,
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- enum dma_data_direction dir)
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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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-#else
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-extern void dma_unmap_single(struct device *, dma_addr_t, size_t, enum dma_data_direction);
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-#endif
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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 to map
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- * @dir: DMA transfer direction
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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 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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+ * 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
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-dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
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- enum dma_data_direction dir)
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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_map_sg - map a set of SG buffers for streaming mode DMA
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- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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- * @sg: list of buffers
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- * @nents: number of buffers to map
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- * @dir: DMA transfer direction
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- *
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- * Map a set of buffers described by scatterlist in streaming
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- * mode for DMA. This is the scatter-gather version of the
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- * above dma_map_single interface. Here the scatter gather list
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- * elements are each tagged with the appropriate dma address
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- * and length. They are obtained via sg_dma_{address,length}(SG).
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- *
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- * NOTE: An implementation may be able to use a smaller number of
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- * DMA address/length pairs than there are SG table elements.
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- * (for example via virtual mapping capabilities)
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- * The routine returns the number of addr/length pairs actually
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- * used, at most nents.
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- *
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- * Device ownership issues as mentioned above for dma_map_single are
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- * the same here.
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- */
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-#ifndef CONFIG_DMABOUNCE
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-static inline int
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-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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- enum dma_data_direction dir)
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-{
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- int i;
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-
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- for (i = 0; i < nents; i++, sg++) {
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- char *virt;
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-
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- sg->dma_address = page_to_dma(dev, sg_page(sg)) + sg->offset;
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- virt = sg_virt(sg);
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-
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- if (!arch_is_coherent())
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- dma_cache_maint(virt, sg->length, dir);
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- }
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-
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- return nents;
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-}
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-#else
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-extern int dma_map_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
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-#endif
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-
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-/**
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- * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
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- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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- * @sg: list of buffers
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- * @nents: number of buffers to map
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- * @dir: DMA transfer direction
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- *
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- * Unmap a set of streaming mode DMA translations.
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- * Again, CPU read rules concerning calls here are the same as for
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- * dma_unmap_single() above.
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- */
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-#ifndef CONFIG_DMABOUNCE
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-static inline void
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-dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
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- enum dma_data_direction dir)
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-{
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-
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- /* nothing to do */
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-}
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-#else
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-extern void dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
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-#endif
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-
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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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@@ -368,145 +369,52 @@ extern void dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_da
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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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-#ifndef CONFIG_DMABOUNCE
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-static inline void
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-dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
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- unsigned long offset, size_t size,
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- enum dma_data_direction dir)
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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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- if (!arch_is_coherent())
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- dma_cache_maint(dma_to_virt(dev, handle) + offset, size, dir);
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+ BUG_ON(!valid_dma_direction(dir));
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+
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+ dmabounce_sync_for_cpu(dev, handle, offset, size, dir);
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}
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-static inline void
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-dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
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- unsigned long offset, size_t size,
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- enum dma_data_direction dir)
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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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+
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+ if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
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+ return;
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+
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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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-#else
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-extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t, unsigned long, size_t, enum dma_data_direction);
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-extern void dma_sync_single_range_for_device(struct device *, dma_addr_t, unsigned long, size_t, enum dma_data_direction);
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-#endif
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-static inline void
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-dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
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- enum dma_data_direction dir)
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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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|
|
{
|
|
|
dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
|
|
|
}
|
|
|
|
|
|
-static inline void
|
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|
-dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
|
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|
- enum dma_data_direction dir)
|
|
|
+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)
|
|
|
{
|
|
|
dma_sync_single_range_for_device(dev, handle, 0, size, dir);
|
|
|
}
|
|
|
|
|
|
-
|
|
|
-/**
|
|
|
- * dma_sync_sg_for_cpu
|
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|
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
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|
- * @sg: list of buffers
|
|
|
- * @nents: number of buffers to map
|
|
|
- * @dir: DMA transfer direction
|
|
|
- *
|
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|
- * Make physical memory consistent for a set of streaming
|
|
|
- * mode DMA translations after a transfer.
|
|
|
- *
|
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|
- * The same as dma_sync_single_for_* but for a scatter-gather list,
|
|
|
- * same rules and usage.
|
|
|
- */
|
|
|
-#ifndef CONFIG_DMABOUNCE
|
|
|
-static inline void
|
|
|
-dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
|
|
|
- enum dma_data_direction dir)
|
|
|
-{
|
|
|
- int i;
|
|
|
-
|
|
|
- for (i = 0; i < nents; i++, sg++) {
|
|
|
- char *virt = sg_virt(sg);
|
|
|
- if (!arch_is_coherent())
|
|
|
- dma_cache_maint(virt, sg->length, dir);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static inline void
|
|
|
-dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
|
|
|
- enum dma_data_direction dir)
|
|
|
-{
|
|
|
- int i;
|
|
|
-
|
|
|
- for (i = 0; i < nents; i++, sg++) {
|
|
|
- char *virt = sg_virt(sg);
|
|
|
- if (!arch_is_coherent())
|
|
|
- dma_cache_maint(virt, sg->length, dir);
|
|
|
- }
|
|
|
-}
|
|
|
-#else
|
|
|
-extern void dma_sync_sg_for_cpu(struct device*, struct scatterlist*, int, enum dma_data_direction);
|
|
|
-extern void dma_sync_sg_for_device(struct device*, struct scatterlist*, int, enum dma_data_direction);
|
|
|
-#endif
|
|
|
-
|
|
|
-#ifdef CONFIG_DMABOUNCE
|
|
|
/*
|
|
|
- * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
|
|
|
- * and utilize bounce buffers as needed to work around limited DMA windows.
|
|
|
- *
|
|
|
- * On the SA-1111, a bug limits DMA to only certain regions of RAM.
|
|
|
- * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
|
|
|
- * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
|
|
|
- *
|
|
|
- * The following are helper functions used by the dmabounce subystem
|
|
|
- *
|
|
|
- */
|
|
|
-
|
|
|
-/**
|
|
|
- * dmabounce_register_dev
|
|
|
- *
|
|
|
- * @dev: valid struct device pointer
|
|
|
- * @small_buf_size: size of buffers to use with small buffer pool
|
|
|
- * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
|
|
|
- *
|
|
|
- * This function should be called by low-level platform code to register
|
|
|
- * a device as requireing DMA buffer bouncing. The function will allocate
|
|
|
- * appropriate DMA pools for the device.
|
|
|
- *
|
|
|
- */
|
|
|
-extern int dmabounce_register_dev(struct device *, unsigned long, unsigned long);
|
|
|
-
|
|
|
-/**
|
|
|
- * dmabounce_unregister_dev
|
|
|
- *
|
|
|
- * @dev: valid struct device pointer
|
|
|
- *
|
|
|
- * This function should be called by low-level platform code when device
|
|
|
- * that was previously registered with dmabounce_register_dev is removed
|
|
|
- * from the system.
|
|
|
- *
|
|
|
+ * The scatter list versions of the above methods.
|
|
|
*/
|
|
|
-extern void dmabounce_unregister_dev(struct device *);
|
|
|
+extern int dma_map_sg(struct device *, struct scatterlist *, int,
|
|
|
+ enum dma_data_direction);
|
|
|
+extern void dma_unmap_sg(struct device *, struct scatterlist *, int,
|
|
|
+ enum dma_data_direction);
|
|
|
+extern void dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
|
|
|
+ enum dma_data_direction);
|
|
|
+extern void dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
|
|
|
+ enum dma_data_direction);
|
|
|
|
|
|
-/**
|
|
|
- * dma_needs_bounce
|
|
|
- *
|
|
|
- * @dev: valid struct device pointer
|
|
|
- * @dma_handle: dma_handle of unbounced buffer
|
|
|
- * @size: size of region being mapped
|
|
|
- *
|
|
|
- * Platforms that utilize the dmabounce mechanism must implement
|
|
|
- * this function.
|
|
|
- *
|
|
|
- * The dmabounce routines call this function whenever a dma-mapping
|
|
|
- * is requested to determine whether a given buffer needs to be bounced
|
|
|
- * or not. The function must return 0 if the buffer is OK for
|
|
|
- * DMA access and 1 if the buffer needs to be bounced.
|
|
|
- *
|
|
|
- */
|
|
|
-extern int dma_needs_bounce(struct device*, dma_addr_t, size_t);
|
|
|
-#endif /* CONFIG_DMABOUNCE */
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
#endif
|