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- #ifndef ASMARM_DMA_MAPPING_H
- #define ASMARM_DMA_MAPPING_H
- #ifdef __KERNEL__
- #include <linux/mm_types.h>
- #include <linux/scatterlist.h>
- #include <linux/dma-debug.h>
- #include <asm-generic/dma-coherent.h>
- #include <asm/memory.h>
- #ifdef __arch_page_to_dma
- #error Please update to __arch_pfn_to_dma
- #endif
- /*
- * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
- * functions used internally by the DMA-mapping API to provide DMA
- * addresses. They must not be used by drivers.
- */
- #ifndef __arch_pfn_to_dma
- static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
- {
- return (dma_addr_t)__pfn_to_bus(pfn);
- }
- static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
- {
- return __bus_to_pfn(addr);
- }
- static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
- {
- return (void *)__bus_to_virt(addr);
- }
- static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
- {
- return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
- }
- #else
- static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
- {
- return __arch_pfn_to_dma(dev, pfn);
- }
- static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
- {
- return __arch_dma_to_pfn(dev, addr);
- }
- static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
- {
- return __arch_dma_to_virt(dev, addr);
- }
- static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
- {
- return __arch_virt_to_dma(dev, addr);
- }
- #endif
- /*
- * The DMA API is built upon the notion of "buffer ownership". A buffer
- * is either exclusively owned by the CPU (and therefore may be accessed
- * by it) or exclusively owned by the DMA device. These helper functions
- * represent the transitions between these two ownership states.
- *
- * Note, however, that on later ARMs, this notion does not work due to
- * speculative prefetches. We model our approach on the assumption that
- * the CPU does do speculative prefetches, which means we clean caches
- * before transfers and delay cache invalidation until transfer completion.
- *
- * Private support functions: these are not part of the API and are
- * liable to change. Drivers must not use these.
- */
- static inline void __dma_single_cpu_to_dev(const void *kaddr, size_t size,
- enum dma_data_direction dir)
- {
- extern void ___dma_single_cpu_to_dev(const void *, size_t,
- enum dma_data_direction);
- if (!arch_is_coherent())
- ___dma_single_cpu_to_dev(kaddr, size, dir);
- }
- static inline void __dma_single_dev_to_cpu(const void *kaddr, size_t size,
- enum dma_data_direction dir)
- {
- extern void ___dma_single_dev_to_cpu(const void *, size_t,
- enum dma_data_direction);
- if (!arch_is_coherent())
- ___dma_single_dev_to_cpu(kaddr, size, dir);
- }
- static inline void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
- size_t size, enum dma_data_direction dir)
- {
- extern void ___dma_page_cpu_to_dev(struct page *, unsigned long,
- size_t, enum dma_data_direction);
- if (!arch_is_coherent())
- ___dma_page_cpu_to_dev(page, off, size, dir);
- }
- static inline void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
- size_t size, enum dma_data_direction dir)
- {
- extern void ___dma_page_dev_to_cpu(struct page *, unsigned long,
- size_t, enum dma_data_direction);
- if (!arch_is_coherent())
- ___dma_page_dev_to_cpu(page, off, size, dir);
- }
- /*
- * Return whether the given device DMA address mask can be supported
- * properly. For example, if your device can only drive the low 24-bits
- * during bus mastering, then you would pass 0x00ffffff as the mask
- * to this function.
- *
- * FIXME: This should really be a platform specific issue - we should
- * return false if GFP_DMA allocations may not satisfy the supplied 'mask'.
- */
- static inline int dma_supported(struct device *dev, u64 mask)
- {
- if (mask < ISA_DMA_THRESHOLD)
- return 0;
- return 1;
- }
- static inline int dma_set_mask(struct device *dev, u64 dma_mask)
- {
- #ifdef CONFIG_DMABOUNCE
- if (dev->archdata.dmabounce) {
- if (dma_mask >= ISA_DMA_THRESHOLD)
- return 0;
- else
- return -EIO;
- }
- #endif
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
- return -EIO;
- *dev->dma_mask = dma_mask;
- return 0;
- }
- /*
- * DMA errors are defined by all-bits-set in the DMA address.
- */
- static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
- {
- return dma_addr == ~0;
- }
- /*
- * 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)
- {
- return NULL;
- }
- static inline void dma_free_noncoherent(struct device *dev, size_t size,
- void *cpu_addr, dma_addr_t handle)
- {
- }
- /**
- * dma_alloc_coherent - allocate consistent memory for DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @size: required memory size
- * @handle: bus-specific DMA address
- *
- * Allocate some uncached, unbuffered memory for a device for
- * performing DMA. This function allocates pages, and will
- * return the CPU-viewed address, and sets @handle to be the
- * device-viewed address.
- */
- extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
- /**
- * dma_alloc_writethrough - allocate consistent memory for DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @size: required memory size
- * @handle: bus-specific DMA address
- *
- * Allocate some writethrough cached, for a device for
- * performing DMA. This function allocates pages, and will
- * return the CPU-viewed address, and sets @handle to be the
- * device-viewed address.
- */
- extern void *dma_alloc_writethrough(struct device *, size_t, dma_addr_t *, gfp_t);
- /**
- * dma_alloc_noncacheable - allocate consistent memory for DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @size: required memory size
- * @handle: bus-specific DMA address
- *
- * Allocate some noncacheable memory, for a device for
- * performing DMA. This function allocates pages, and will
- * return the CPU-viewed address, and sets @handle to be the
- * device-viewed address.
- */
- extern void *dma_alloc_noncacheable(struct device *, size_t, dma_addr_t *, gfp_t);
- /**
- * dma_free_coherent - free memory allocated by dma_alloc_coherent
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @size: size of memory originally requested in dma_alloc_coherent
- * @cpu_addr: CPU-view address returned from dma_alloc_coherent
- * @handle: device-view address returned from dma_alloc_coherent
- *
- * Free (and unmap) a DMA buffer previously allocated by
- * dma_alloc_coherent().
- *
- * 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 *, size_t, void *, dma_addr_t);
- /**
- * dma_mmap_coherent - map a coherent DMA allocation into user space
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @vma: vm_area_struct describing requested user mapping
- * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
- * @handle: device-view address returned from dma_alloc_coherent
- * @size: size of memory originally requested in dma_alloc_coherent
- *
- * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
- * 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 *, struct vm_area_struct *,
- void *, dma_addr_t, size_t);
- /**
- * dma_alloc_writecombine - allocate writecombining memory for DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @size: required memory size
- * @handle: bus-specific DMA address
- *
- * Allocate some uncached, buffered memory for a device for
- * performing DMA. This function allocates pages, and will
- * return the CPU-viewed address, and sets @handle to be the
- * device-viewed address.
- */
- 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 *, 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 void __dma_unmap_single(struct device *, dma_addr_t, 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_page(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
- static inline int dmabounce_sync_for_cpu(struct device *d, dma_addr_t addr,
- unsigned long offset, size_t size, enum dma_data_direction dir)
- {
- return 1;
- }
- static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
- unsigned long offset, size_t size, enum dma_data_direction dir)
- {
- return 1;
- }
- static inline dma_addr_t __dma_map_single(struct device *dev, void *cpu_addr,
- size_t size, enum dma_data_direction dir)
- {
- __dma_single_cpu_to_dev(cpu_addr, size, dir);
- return virt_to_dma(dev, cpu_addr);
- }
- 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)
- {
- __dma_page_cpu_to_dev(page, offset, size, dir);
- return pfn_to_dma(dev, page_to_pfn(page)) + offset;
- }
- static inline void __dma_unmap_single(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir)
- {
- __dma_single_dev_to_cpu(dma_to_virt(dev, handle), size, dir);
- }
- static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir)
- {
- __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
- handle & ~PAGE_MASK, size, dir);
- }
- #endif /* CONFIG_DMABOUNCE */
- /**
- * dma_map_single - map a single buffer for streaming DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @cpu_addr: CPU direct mapped address of buffer
- * @size: size of buffer to map
- * @dir: DMA transfer direction
- *
- * Ensure that any data held in the cache is appropriately discarded
- * or written back.
- *
- * The device owns this memory once this call has completed. The CPU
- * can regain ownership by calling dma_unmap_single() or
- * dma_sync_single_for_cpu().
- */
- static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
- size_t size, enum dma_data_direction dir)
- {
- dma_addr_t addr;
- BUG_ON(!valid_dma_direction(dir));
- addr = __dma_map_single(dev, cpu_addr, size, dir);
- debug_dma_map_page(dev, virt_to_page(cpu_addr),
- (unsigned long)cpu_addr & ~PAGE_MASK, size,
- dir, addr, true);
- return addr;
- }
- /**
- * dma_map_page - map a portion of a page for streaming DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @page: page that buffer resides in
- * @offset: offset into page for start of buffer
- * @size: size of buffer to map
- * @dir: DMA transfer direction
- *
- * Ensure that any data held in the cache is appropriately discarded
- * or written back.
- *
- * The device owns this memory once this call has completed. The 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)
- {
- dma_addr_t addr;
- BUG_ON(!valid_dma_direction(dir));
- addr = __dma_map_page(dev, page, offset, size, dir);
- debug_dma_map_page(dev, page, offset, size, dir, addr, false);
- return addr;
- }
- /**
- * 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 (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.
- * 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_single(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir)
- {
- debug_dma_unmap_page(dev, handle, size, dir, true);
- __dma_unmap_single(dev, handle, size, dir);
- }
- /**
- * 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 (same as passed to dma_map_page)
- * @dir: DMA transfer direction (same as passed to dma_map_page)
- *
- * 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)
- {
- debug_dma_unmap_page(dev, handle, size, dir, false);
- __dma_unmap_page(dev, handle, size, dir);
- }
- /**
- * dma_sync_single_range_for_cpu
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @handle: DMA address of buffer
- * @offset: offset of region to start sync
- * @size: size of region to sync
- * @dir: DMA transfer direction (same as passed to dma_map_single)
- *
- * Make physical memory consistent for a single streaming mode DMA
- * translation after a transfer.
- *
- * If you perform a dma_map_single() but wish to interrogate the
- * buffer using the cpu, yet do not wish to teardown the PCI dma
- * mapping, you must call this function before doing so. At the
- * next point you give the PCI dma address back to the card, you
- * must first the perform a dma_sync_for_device, and then the
- * device again owns the buffer.
- */
- 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)
- {
- BUG_ON(!valid_dma_direction(dir));
- debug_dma_sync_single_for_cpu(dev, handle + offset, size, dir);
- if (!dmabounce_sync_for_cpu(dev, handle, offset, size, dir))
- return;
- __dma_single_dev_to_cpu(dma_to_virt(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)
- {
- BUG_ON(!valid_dma_direction(dir));
- debug_dma_sync_single_for_device(dev, handle + offset, size, dir);
- if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
- return;
- __dma_single_cpu_to_dev(dma_to_virt(dev, handle) + offset, size, 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)
- {
- dma_sync_single_range_for_device(dev, handle, 0, size, dir);
- }
- /*
- * The scatter list versions of the above methods.
- */
- 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);
- #endif /* __KERNEL__ */
- #endif
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