projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1b2e98bc AS |
1 | /* |
| 2 | * ACPI helpers for DMA request / controller | |
| 3 | * | |
| 4 | * Based on of_dma.h | |
| 5 | * | |
| 6 | * Copyright (C) 2013, Intel Corporation | |
| 7 | * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or modify | |
| 10 | * it under the terms of the GNU General Public License version 2 as | |
| 11 | * published by the Free Software Foundation. | |
| 12 | */ | |
| 13 | ||
| 14 | #ifndef __LINUX_ACPI_DMA_H | |
| 15 | #define __LINUX_ACPI_DMA_H | |
| 16 | ||
| 17 | #include <linux/list.h> | |
| 18 | #include <linux/device.h> | |
| 0f6a928d | 19 | #include <linux/err.h> |
| 1b2e98bc AS |
20 | #include <linux/dmaengine.h> |
| 21 | ||
| 22 | /** | |
| 23 | * struct acpi_dma_spec - slave device DMA resources | |
| 24 | * @chan_id: channel unique id | |
| 25 | * @slave_id: request line unique id | |
| 26 | * @dev: struct device of the DMA controller to be used in the filter | |
| 27 | * function | |
| 28 | */ | |
| 29 | struct acpi_dma_spec { | |
| 30 | int chan_id; | |
| 31 | int slave_id; | |
| 32 | struct device *dev; | |
| 33 | }; | |
| 34 | ||
| 35 | /** | |
| 36 | * struct acpi_dma - representation of the registered DMAC | |
| 37 | * @dma_controllers: linked list node | |
| 38 | * @dev: struct device of this controller | |
| 39 | * @acpi_dma_xlate: callback function to find a suitable channel | |
| 40 | * @data: private data used by a callback function | |
| ee8209fd AS |
41 | * @base_request_line: first supported request line (CSRT) |
| 42 | * @end_request_line: last supported request line (CSRT) | |
| 1b2e98bc AS |
43 | */ |
| 44 | struct acpi_dma { | |
| 45 | struct list_head dma_controllers; | |
| 46 | struct device *dev; | |
| 47 | struct dma_chan *(*acpi_dma_xlate) | |
| 48 | (struct acpi_dma_spec *, struct acpi_dma *); | |
| 49 | void *data; | |
| ee8209fd AS |
50 | unsigned short base_request_line; |
| 51 | unsigned short end_request_line; | |
| 1b2e98bc AS |
52 | }; |
| 53 | ||
| 54 | /* Used with acpi_dma_simple_xlate() */ | |
| 55 | struct acpi_dma_filter_info { | |
| 56 | dma_cap_mask_t dma_cap; | |
| 57 | dma_filter_fn filter_fn; | |
| 58 | }; | |
| 59 | ||
| 60 | #ifdef CONFIG_DMA_ACPI | |
| 61 | ||
| 62 | int acpi_dma_controller_register(struct device *dev, | |
| 63 | struct dma_chan *(*acpi_dma_xlate) | |
| 64 | (struct acpi_dma_spec *, struct acpi_dma *), | |
| 65 | void *data); | |
| 66 | int acpi_dma_controller_free(struct device *dev); | |
| 67 | int devm_acpi_dma_controller_register(struct device *dev, | |
| 68 | struct dma_chan *(*acpi_dma_xlate) | |
| 69 | (struct acpi_dma_spec *, struct acpi_dma *), | |
| 70 | void *data); | |
| 71 | void devm_acpi_dma_controller_free(struct device *dev); | |
| 72 | ||
| 73 | struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev, | |
| 74 | size_t index); | |
| 75 | struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev, | |
| 76 | const char *name); | |
| 77 | ||
| 78 | struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec, | |
| 79 | struct acpi_dma *adma); | |
| 80 | #else | |
| 81 | ||
| 82 | static inline int acpi_dma_controller_register(struct device *dev, | |
| 83 | struct dma_chan *(*acpi_dma_xlate) | |
| 84 | (struct acpi_dma_spec *, struct acpi_dma *), | |
| 85 | void *data) | |
| 86 | { | |
| 87 | return -ENODEV; | |
| 88 | } | |
| 89 | static inline int acpi_dma_controller_free(struct device *dev) | |
| 90 | { | |
| 91 | return -ENODEV; | |
| 92 | } | |
| 93 | static inline int devm_acpi_dma_controller_register(struct device *dev, | |
| 94 | struct dma_chan *(*acpi_dma_xlate) | |
| 95 | (struct acpi_dma_spec *, struct acpi_dma *), | |
| 96 | void *data) | |
| 97 | { | |
| 98 | return -ENODEV; | |
| 99 | } | |
| 100 | static inline void devm_acpi_dma_controller_free(struct device *dev) | |
| 101 | { | |
| 102 | } | |
| 103 | ||
| 104 | static inline struct dma_chan *acpi_dma_request_slave_chan_by_index( | |
| 105 | struct device *dev, size_t index) | |
| 106 | { | |
| 0f6a928d | 107 | return ERR_PTR(-ENODEV); |
| 1b2e98bc AS |
108 | } |
| 109 | static inline struct dma_chan *acpi_dma_request_slave_chan_by_name( | |
| 110 | struct device *dev, const char *name) | |
| 111 | { | |
| 0f6a928d | 112 | return ERR_PTR(-ENODEV); |
| 1b2e98bc AS |
113 | } |
| 114 | ||
| 115 | #define acpi_dma_simple_xlate NULL | |
| 116 | ||
| 117 | #endif | |
| 118 | ||
| 119 | #define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index | |
| 120 | ||
| 121 | #endif /* __LINUX_ACPI_DMA_H */ |