1 files changed, 143 insertions, 235 deletions

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 7b95d2058395..1cb8602dd9d5 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -104,15 +104,14 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
  * function so drivers using this API are highlighted with build warnings.
  */
-static inline void *
-dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
+static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
+                dma_addr_t *handle, gfp_t gfp)
 {
         return NULL;
 }
 
-static inline void
-dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,
-                     dma_addr_t handle)
+static inline void dma_free_noncoherent(struct device *dev, size_t size,
+                void *cpu_addr, dma_addr_t handle)
 {
 }
 
@@ -127,8 +126,7 @@ dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,
  * return the CPU-viewed address, and sets @handle to be the
  * device-viewed address.
  */
-extern void *
-dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp);
+extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
 
 /**
  * dma_free_coherent - free memory allocated by dma_alloc_coherent
@@ -143,9 +141,7 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gf
  * References to memory and mappings associated with cpu_addr/handle
  * during and after this call executing are illegal.
  */
-extern void
-dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
-                  dma_addr_t handle);
+extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
 
 /**
  * dma_mmap_coherent - map a coherent DMA allocation into user space
@@ -159,8 +155,8 @@ dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
  * into user space.  The coherent DMA buffer must not be freed by the
  * driver until the user space mapping has been released.
  */
-int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
-                      void *cpu_addr, dma_addr_t handle, size_t size);
+int dma_mmap_coherent(struct device *, struct vm_area_struct *,
+                void *, dma_addr_t, size_t);
 
 
 /**
@@ -174,14 +170,94 @@ int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
  * return the CPU-viewed address, and sets @handle to be the
  * device-viewed address.
  */
-extern void *
-dma_alloc_writecombine(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp);
+extern void *dma_alloc_writecombine(struct device *, size_t, dma_addr_t *,
+                gfp_t);
 
 #define dma_free_writecombine(dev,size,cpu_addr,handle) \
         dma_free_coherent(dev,size,cpu_addr,handle)
 
-int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
-                          void *cpu_addr, dma_addr_t handle, size_t size);
+int dma_mmap_writecombine(struct device *, struct vm_area_struct *,
+                void *, dma_addr_t, size_t);
+
+
+#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.
+ *
+ */
+extern void dmabounce_unregister_dev(struct device *);
+
+/**
+ * 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);
+
+/*
+ * The DMA API, implemented by dmabounce.c.  See below for descriptions.
+ */
+extern dma_addr_t dma_map_single(struct device *, void *, size_t,
+                enum dma_data_direction);
+extern dma_addr_t dma_map_page(struct device *, struct page *,
+                unsigned long, size_t, enum dma_data_direction);
+extern void dma_unmap_single(struct device *, dma_addr_t, size_t,
+                enum dma_data_direction);
+
+/*
+ * Private functions
+ */
+int dmabounce_sync_for_cpu(struct device *, dma_addr_t, unsigned long,
+                size_t, enum dma_data_direction);
+int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
+                size_t, enum dma_data_direction);
+#else
+#define dmabounce_sync_for_cpu(dev,dma,off,sz,dir)      (1)
+#define dmabounce_sync_for_device(dev,dma,off,sz,dir)   (1)
 
 
 /**
@@ -198,19 +274,16 @@ int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
  * can regain ownership by calling dma_unmap_single() or
  * dma_sync_single_for_cpu().
  */
-#ifndef CONFIG_DMABOUNCE
-static inline dma_addr_t
-dma_map_single(struct device *dev, void *cpu_addr, size_t size,
-               enum dma_data_direction dir)
+static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
+                size_t size, enum dma_data_direction dir)
 {
+        BUG_ON(!valid_dma_direction(dir));
+
         if (!arch_is_coherent())
                 dma_cache_maint(cpu_addr, size, dir);
 
         return virt_to_dma(dev, cpu_addr);
 }
-#else
-extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_direction);
-#endif
 
 /**
  * dma_map_page - map a portion of a page for streaming DMA
@@ -224,23 +297,25 @@ extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_d
  * or written back.
  *
  * The device owns this memory once this call has completed.  The CPU
- * can regain ownership by calling dma_unmap_page() or
- * dma_sync_single_for_cpu().
+ * can regain ownership by calling dma_unmap_page().
  */
-static inline dma_addr_t
-dma_map_page(struct device *dev, struct page *page,
-             unsigned long offset, size_t size,
-             enum dma_data_direction dir)
+static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
+             unsigned long offset, size_t size, enum dma_data_direction dir)
 {
-        return dma_map_single(dev, page_address(page) + offset, size, dir);
+        BUG_ON(!valid_dma_direction(dir));
+
+        if (!arch_is_coherent())
+                dma_cache_maint(page_address(page) + offset, size, dir);
+
+        return page_to_dma(dev, page) + offset;
 }
 
 /**
  * dma_unmap_single - unmap a single buffer previously mapped
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @handle: DMA address of buffer
- * @size: size of buffer to map
- * @dir: DMA transfer direction
+ * @size: size of buffer (same as passed to dma_map_single)
+ * @dir: DMA transfer direction (same as passed to dma_map_single)
  *
  * Unmap a single streaming mode DMA translation.  The handle and size
  * must match what was provided in the previous dma_map_single() call.
@@ -249,108 +324,34 @@ dma_map_page(struct device *dev, struct page *page,
  * After this call, reads by the CPU to the buffer are guaranteed to see
  * whatever the device wrote there.
  */
-#ifndef CONFIG_DMABOUNCE
-static inline void
-dma_unmap_single(struct device *dev, dma_addr_t handle, size_t size,
-                 enum dma_data_direction dir)
+static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
+                size_t size, enum dma_data_direction dir)
 {
         /* nothing to do */
 }
-#else
-extern void dma_unmap_single(struct device *, dma_addr_t, size_t, enum dma_data_direction);
-#endif
+#endif /* CONFIG_DMABOUNCE */
 
 /**
  * dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @handle: DMA address of buffer
- * @size: size of buffer to map
- * @dir: DMA transfer direction
+ * @size: size of buffer (same as passed to dma_map_page)
+ * @dir: DMA transfer direction (same as passed to dma_map_page)
  *
- * Unmap a single streaming mode DMA translation.  The handle and size
- * must match what was provided in the previous dma_map_single() call.
+ * Unmap a page streaming mode DMA translation.  The handle and size
+ * must match what was provided in the previous dma_map_page() call.
  * All other usages are undefined.
  *
  * After this call, reads by the CPU to the buffer are guaranteed to see
  * whatever the device wrote there.
  */
-static inline void
-dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
-               enum dma_data_direction dir)
+static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
+                size_t size, enum dma_data_direction dir)
 {
         dma_unmap_single(dev, handle, size, dir);
 }
 
 /**
- * dma_map_sg - map a set of SG buffers for streaming mode DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to map
- * @dir: DMA transfer direction
- *
- * Map a set of buffers described by scatterlist in streaming
- * mode for DMA.  This is the scatter-gather version of the
- * above dma_map_single interface.  Here the scatter gather list
- * elements are each tagged with the appropriate dma address
- * and length.  They are obtained via sg_dma_{address,length}(SG).
- *
- * NOTE: An implementation may be able to use a smaller number of
- *       DMA address/length pairs than there are SG table elements.
- *       (for example via virtual mapping capabilities)
- *       The routine returns the number of addr/length pairs actually
- *       used, at most nents.
- *
- * Device ownership issues as mentioned above for dma_map_single are
- * the same here.
- */
-#ifndef CONFIG_DMABOUNCE
-static inline int
-dma_map_sg(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->dma_address = page_to_dma(dev, sg_page(sg)) + sg->offset;
-                virt = sg_virt(sg);
-
-                if (!arch_is_coherent())
-                        dma_cache_maint(virt, sg->length, dir);
-        }
-
-        return nents;
-}
-#else
-extern int dma_map_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
-#endif
-
-/**
- * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to map
- * @dir: DMA transfer direction
- *
- * Unmap a set of streaming mode DMA translations.
- * Again, CPU read rules concerning calls here are the same as for
- * dma_unmap_single() above.
- */
-#ifndef CONFIG_DMABOUNCE
-static inline void
-dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
-             enum dma_data_direction dir)
-{
-
-        /* nothing to do */
-}
-#else
-extern void dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
-#endif
-
-
-/**
  * dma_sync_single_range_for_cpu
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @handle: DMA address of buffer
@@ -368,145 +369,52 @@ extern void dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_da
  * must first the perform a dma_sync_for_device, and then the
  * device again owns the buffer.
  */
-#ifndef CONFIG_DMABOUNCE
-static inline void
-dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
-                              unsigned long offset, size_t size,
-                              enum dma_data_direction dir)
+static inline void dma_sync_single_range_for_cpu(struct device *dev,
+                dma_addr_t handle, unsigned long offset, size_t size,
+                enum dma_data_direction dir)
 {
-        if (!arch_is_coherent())
-                dma_cache_maint(dma_to_virt(dev, handle) + offset, size, dir);
+        BUG_ON(!valid_dma_direction(dir));
+
+        dmabounce_sync_for_cpu(dev, handle, offset, size, dir);
 }
 
-static inline void
-dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
-                                 unsigned long offset, size_t size,
-                                 enum dma_data_direction dir)
+static inline void dma_sync_single_range_for_device(struct device *dev,
+                dma_addr_t handle, unsigned long offset, size_t size,
+                enum dma_data_direction dir)
 {
+        BUG_ON(!valid_dma_direction(dir));
+
+        if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
+                return;
+
         if (!arch_is_coherent())
                 dma_cache_maint(dma_to_virt(dev, handle) + offset, size, dir);
 }
-#else
-extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t, unsigned long, size_t, enum dma_data_direction);
-extern void dma_sync_single_range_for_device(struct device *, dma_addr_t, unsigned long, size_t, enum dma_data_direction);
-#endif
 
-static inline void
-dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
-                        enum dma_data_direction dir)
+static inline void dma_sync_single_for_cpu(struct device *dev,
+                dma_addr_t handle, size_t size, enum dma_data_direction dir)
 {
         dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
 }
 
-static inline void
-dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
-                           enum dma_data_direction dir)
+static inline void dma_sync_single_for_device(struct device *dev,
+                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
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to map
- * @dir: DMA transfer direction
- *
- * Make physical memory consistent for a set of streaming
- * mode DMA translations after a transfer.
- *
- * 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