/* * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef __ASM_DMA_MAPPING_H #define __ASM_DMA_MAPPING_H #ifdef __KERNEL__ #include #include #include #include #include #define DMA_ERROR_CODE (~(dma_addr_t)0) extern struct dma_map_ops *dma_ops; extern struct dma_map_ops coherent_swiotlb_dma_ops; extern struct dma_map_ops noncoherent_swiotlb_dma_ops; static inline struct dma_map_ops *__generic_dma_ops(struct device *dev) { if (unlikely(!dev) || !dev->archdata.dma_ops) return dma_ops; else return dev->archdata.dma_ops; } static inline struct dma_map_ops *get_dma_ops(struct device *dev) { if (xen_initial_domain()) return xen_dma_ops; else return __generic_dma_ops(dev); } static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) { dev->archdata.dma_ops = ops; } static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, struct iommu_ops *iommu, bool coherent) { dev->archdata.dma_coherent = coherent; if (coherent) set_dma_ops(dev, &coherent_swiotlb_dma_ops); } #define arch_setup_dma_ops arch_setup_dma_ops /* do not use this function in a driver */ static inline bool is_device_dma_coherent(struct device *dev) { return dev->archdata.dma_coherent; } #include static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { return (dma_addr_t)paddr; } static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) { return (phys_addr_t)dev_addr; } static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr) { struct dma_map_ops *ops = get_dma_ops(dev); debug_dma_mapping_error(dev, dev_addr); return ops->mapping_error(dev, dev_addr); } static inline int dma_supported(struct device *dev, u64 mask) { struct dma_map_ops *ops = get_dma_ops(dev); return ops->dma_supported(dev, mask); } static inline int dma_set_mask(struct device *dev, u64 mask) { if (!dev->dma_mask || !dma_supported(dev, mask)) return -EIO; *dev->dma_mask = mask; return 0; } static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) { if (!dev->dma_mask) return 0; return addr + size - 1 <= *dev->dma_mask; } static inline void dma_mark_clean(void *addr, size_t size) { } #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) #define dma_free_coherent(d, s, h, f) dma_free_attrs(d, s, h, f, NULL) static inline void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flags, struct dma_attrs *attrs) { struct dma_map_ops *ops = get_dma_ops(dev); void *vaddr; if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr)) return vaddr; vaddr = ops->alloc(dev, size, dma_handle, flags, attrs); debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr); return vaddr; } static inline void dma_free_attrs(struct device *dev, size_t size, void *vaddr, dma_addr_t dev_addr, struct dma_attrs *attrs) { struct dma_map_ops *ops = get_dma_ops(dev); if (dma_release_from_coherent(dev, get_order(size), vaddr)) return; debug_dma_free_coherent(dev, size, vaddr, dev_addr); ops->free(dev, size, vaddr, dev_addr, attrs); } /* * There is no dma_cache_sync() implementation, so just return NULL here. */ static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t flags) { return NULL; } static inline void dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle) { } #endif /* __KERNEL__ */ #endif /* __ASM_DMA_MAPPING_H */