Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 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 | |
Suthikulpanit, Suravee | b6197b9 | 2015-06-10 11:08:53 -0500 | [diff] [blame] | 21 | #include <linux/acpi.h> |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 22 | #include <linux/types.h> |
| 23 | #include <linux/vmalloc.h> |
| 24 | |
Stefano Stabellini | 58c8b26 | 2013-10-18 16:01:32 +0000 | [diff] [blame] | 25 | #include <xen/xen.h> |
| 26 | #include <asm/xen/hypervisor.h> |
| 27 | |
Stefano Stabellini | 25b719d | 2013-10-15 15:49:03 +0000 | [diff] [blame] | 28 | #define DMA_ERROR_CODE (~(dma_addr_t)0) |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 29 | extern struct dma_map_ops *dma_ops; |
Suthikulpanit, Suravee | b6197b9 | 2015-06-10 11:08:53 -0500 | [diff] [blame] | 30 | extern struct dma_map_ops dummy_dma_ops; |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 31 | |
Stefano Stabellini | 58c8b26 | 2013-10-18 16:01:32 +0000 | [diff] [blame] | 32 | static inline struct dma_map_ops *__generic_dma_ops(struct device *dev) |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 33 | { |
Suthikulpanit, Suravee | b6197b9 | 2015-06-10 11:08:53 -0500 | [diff] [blame] | 34 | if (unlikely(!dev)) |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 35 | return dma_ops; |
Suthikulpanit, Suravee | b6197b9 | 2015-06-10 11:08:53 -0500 | [diff] [blame] | 36 | else if (dev->archdata.dma_ops) |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 37 | return dev->archdata.dma_ops; |
Suthikulpanit, Suravee | b6197b9 | 2015-06-10 11:08:53 -0500 | [diff] [blame] | 38 | else if (acpi_disabled) |
| 39 | return dma_ops; |
| 40 | |
| 41 | /* |
| 42 | * When ACPI is enabled, if arch_set_dma_ops is not called, |
| 43 | * we will disable device DMA capability by setting it |
| 44 | * to dummy_dma_ops. |
| 45 | */ |
| 46 | return &dummy_dma_ops; |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 47 | } |
| 48 | |
Stefano Stabellini | 58c8b26 | 2013-10-18 16:01:32 +0000 | [diff] [blame] | 49 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) |
| 50 | { |
| 51 | if (xen_initial_domain()) |
| 52 | return xen_dma_ops; |
| 53 | else |
| 54 | return __generic_dma_ops(dev); |
| 55 | } |
| 56 | |
Catalin Marinas | 31dde11 | 2014-12-18 17:13:49 +0000 | [diff] [blame] | 57 | static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, |
| 58 | struct iommu_ops *iommu, bool coherent) |
Catalin Marinas | 2189064 | 2014-09-22 11:48:31 +0100 | [diff] [blame] | 59 | { |
Suthikulpanit, Suravee | b6197b9 | 2015-06-10 11:08:53 -0500 | [diff] [blame] | 60 | if (!acpi_disabled && !dev->archdata.dma_ops) |
| 61 | dev->archdata.dma_ops = dma_ops; |
| 62 | |
Catalin Marinas | 31dde11 | 2014-12-18 17:13:49 +0000 | [diff] [blame] | 63 | dev->archdata.dma_coherent = coherent; |
Catalin Marinas | 2189064 | 2014-09-22 11:48:31 +0100 | [diff] [blame] | 64 | } |
Catalin Marinas | 31dde11 | 2014-12-18 17:13:49 +0000 | [diff] [blame] | 65 | #define arch_setup_dma_ops arch_setup_dma_ops |
Catalin Marinas | 2189064 | 2014-09-22 11:48:31 +0100 | [diff] [blame] | 66 | |
Stefano Stabellini | de7ee50 | 2014-11-20 10:41:35 +0000 | [diff] [blame] | 67 | /* do not use this function in a driver */ |
| 68 | static inline bool is_device_dma_coherent(struct device *dev) |
| 69 | { |
Catalin Marinas | 9d3bfbb | 2015-01-12 20:48:53 +0000 | [diff] [blame] | 70 | if (!dev) |
| 71 | return false; |
Stefano Stabellini | de7ee50 | 2014-11-20 10:41:35 +0000 | [diff] [blame] | 72 | return dev->archdata.dma_coherent; |
| 73 | } |
| 74 | |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 75 | #include <asm-generic/dma-mapping-common.h> |
| 76 | |
| 77 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| 78 | { |
| 79 | return (dma_addr_t)paddr; |
| 80 | } |
| 81 | |
| 82 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) |
| 83 | { |
| 84 | return (phys_addr_t)dev_addr; |
| 85 | } |
| 86 | |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 87 | static inline int dma_supported(struct device *dev, u64 mask) |
| 88 | { |
| 89 | struct dma_map_ops *ops = get_dma_ops(dev); |
| 90 | return ops->dma_supported(dev, mask); |
| 91 | } |
| 92 | |
| 93 | static inline int dma_set_mask(struct device *dev, u64 mask) |
| 94 | { |
| 95 | if (!dev->dma_mask || !dma_supported(dev, mask)) |
| 96 | return -EIO; |
| 97 | *dev->dma_mask = mask; |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 103 | { |
| 104 | if (!dev->dma_mask) |
Joe Perches | cc3979b | 2015-03-31 00:46:00 +0100 | [diff] [blame] | 105 | return false; |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 106 | |
| 107 | return addr + size - 1 <= *dev->dma_mask; |
| 108 | } |
| 109 | |
| 110 | static inline void dma_mark_clean(void *addr, size_t size) |
| 111 | { |
| 112 | } |
| 113 | |
Catalin Marinas | 09b5541 | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 114 | #endif /* __KERNEL__ */ |
| 115 | #endif /* __ASM_DMA_MAPPING_H */ |