/* * DMA operations for the Hexagon architecture * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #ifndef _ASM_DMA_MAPPING_H #define _ASM_DMA_MAPPING_H #include <linux/types.h> #include <linux/cache.h> #include <linux/mm.h> #include <linux/scatterlist.h> #include <linux/dma-debug.h> #include <linux/dma-attrs.h> #include <asm/io.h> struct device; extern int bad_dma_address; extern struct dma_map_ops *dma_ops; #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) static inline struct dma_map_ops *get_dma_ops(struct device *dev) { if (unlikely(dev == NULL)) return NULL; return dma_ops; } extern int dma_supported(struct device *dev, u64 mask); extern int dma_set_mask(struct device *dev, u64 mask); extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle); extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction); #include <asm-generic/dma-mapping-common.h> 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 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { struct dma_map_ops *dma_ops = get_dma_ops(dev); if (dma_ops->mapping_error) return dma_ops->mapping_error(dev, dma_addr); return (dma_addr == bad_dma_address); } #define dma_alloc_coherent(d,s,h,f) dma_alloc_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 flag, struct dma_attrs *attrs) { void *ret; struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!dma_ops); ret = ops->alloc(dev, size, dma_handle, flag, attrs); debug_dma_alloc_coherent(dev, size, *dma_handle, ret); return ret; } #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL) static inline void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle, struct dma_attrs *attrs) { struct dma_map_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->free(dev, size, cpu_addr, dma_handle, attrs); debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); } #endif