1 /* 2 * Copyright (C) 2012 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __ASM_DMA_MAPPING_H 17 #define __ASM_DMA_MAPPING_H 18 19 #ifdef __KERNEL__ 20 21 #include <linux/types.h> 22 #include <linux/vmalloc.h> 23 24 #include <xen/xen.h> 25 #include <asm/xen/hypervisor.h> 26 27 extern const struct dma_map_ops dummy_dma_ops; 28 get_arch_dma_ops(struct bus_type * bus)29static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) 30 { 31 /* 32 * We expect no ISA devices, and all other DMA masters are expected to 33 * have someone call arch_setup_dma_ops at device creation time. 34 */ 35 return &dummy_dma_ops; 36 } 37 38 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, 39 const struct iommu_ops *iommu, bool coherent); 40 #define arch_setup_dma_ops arch_setup_dma_ops 41 42 #ifdef CONFIG_IOMMU_DMA 43 void arch_teardown_dma_ops(struct device *dev); 44 #define arch_teardown_dma_ops arch_teardown_dma_ops 45 #endif 46 47 /* do not use this function in a driver */ is_device_dma_coherent(struct device * dev)48static inline bool is_device_dma_coherent(struct device *dev) 49 { 50 return dev->archdata.dma_coherent; 51 } 52 53 #endif /* __KERNEL__ */ 54 #endif /* __ASM_DMA_MAPPING_H */ 55
