/* * Implements the generic device dma API for microblaze and the pci * * Copyright (C) 2009-2010 Michal Simek * Copyright (C) 2009-2010 PetaLogix * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. * * This file is base on powerpc and x86 dma-mapping.h versions * Copyright (C) 2004 IBM */ #ifndef _ASM_MICROBLAZE_DMA_MAPPING_H #define _ASM_MICROBLAZE_DMA_MAPPING_H /* * See Documentation/PCI/PCI-DMA-mapping.txt and * Documentation/DMA-API.txt for documentation. */ #include #include #include #include #include #include #include #include #define DMA_ERROR_CODE (~(dma_addr_t)0x0) #define __dma_alloc_coherent(dev, gfp, size, handle) NULL #define __dma_free_coherent(size, addr) ((void)0) #define __dma_sync(addr, size, rw) ((void)0) #define __dma_sync_page(pg, off, sz, rw) ((void)0) static inline unsigned long device_to_mask(struct device *dev) { if (dev->dma_mask && *dev->dma_mask) return *dev->dma_mask; /* Assume devices without mask can take 32 bit addresses */ return 0xfffffffful; } extern struct dma_map_ops *dma_ops; /* * Available generic sets of operations */ extern struct dma_map_ops dma_direct_ops; static inline struct dma_map_ops *get_dma_ops(struct device *dev) { /* We don't handle the NULL dev case for ISA for now. We could * do it via an out of line call but it is not needed for now. The * only ISA DMA device we support is the floppy and we have a hack * in the floppy driver directly to get a device for us. */ if (unlikely(!dev) || !dev->archdata.dma_ops) return NULL; return dev->archdata.dma_ops; } static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) { dev->archdata.dma_ops = ops; } static inline int dma_supported(struct device *dev, u64 mask) { struct dma_map_ops *ops = get_dma_ops(dev); if (unlikely(!ops)) return 0; if (!ops->dma_supported) return 1; return ops->dma_supported(dev, mask); } #ifdef CONFIG_PCI /* We have our own implementation of pci_set_dma_mask() */ #define HAVE_ARCH_PCI_SET_DMA_MASK #endif static inline int dma_set_mask(struct device *dev, u64 dma_mask) { struct dma_map_ops *ops = get_dma_ops(dev); if (unlikely(ops == NULL)) return -EIO; if (ops->set_dma_mask) return ops->set_dma_mask(dev, dma_mask); if (!dev->dma_mask || !dma_supported(dev, dma_mask)) return -EIO; *dev->dma_mask = dma_mask; return 0; } #include static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { struct dma_map_ops *ops = get_dma_ops(dev); if (ops->mapping_error) return ops->mapping_error(dev, dma_addr); return (dma_addr == DMA_ERROR_CODE); } #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) #define dma_is_consistent(d, h) (1) static inline void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) { struct dma_map_ops *ops = get_dma_ops(dev); void *memory; BUG_ON(!ops); memory = ops->alloc_coherent(dev, size, dma_handle, flag); debug_dma_alloc_coherent(dev, size, *dma_handle, memory); return memory; } static inline void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle) { struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!ops); debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); ops->free_coherent(dev, size, cpu_addr, dma_handle); } static inline int dma_get_cache_alignment(void) { return L1_CACHE_BYTES; } static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync(vaddr, size, (int)direction); } #endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */