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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> | |
19 | #include <linux/dmaengine.h> | |
20 | ||
21 | /** | |
22 | * struct acpi_dma_spec - slave device DMA resources | |
23 | * @chan_id: channel unique id | |
24 | * @slave_id: request line unique id | |
25 | * @dev: struct device of the DMA controller to be used in the filter | |
26 | * function | |
27 | */ | |
28 | struct acpi_dma_spec { | |
29 | int chan_id; | |
30 | int slave_id; | |
31 | struct device *dev; | |
32 | }; | |
33 | ||
34 | /** | |
35 | * struct acpi_dma - representation of the registered DMAC | |
36 | * @dma_controllers: linked list node | |
37 | * @dev: struct device of this controller | |
38 | * @acpi_dma_xlate: callback function to find a suitable channel | |
39 | * @data: private data used by a callback function | |
40 | */ | |
41 | struct acpi_dma { | |
42 | struct list_head dma_controllers; | |
43 | struct device *dev; | |
44 | struct dma_chan *(*acpi_dma_xlate) | |
45 | (struct acpi_dma_spec *, struct acpi_dma *); | |
46 | void *data; | |
47 | }; | |
48 | ||
49 | /* Used with acpi_dma_simple_xlate() */ | |
50 | struct acpi_dma_filter_info { | |
51 | dma_cap_mask_t dma_cap; | |
52 | dma_filter_fn filter_fn; | |
53 | }; | |
54 | ||
55 | #ifdef CONFIG_DMA_ACPI | |
56 | ||
57 | int acpi_dma_controller_register(struct device *dev, | |
58 | struct dma_chan *(*acpi_dma_xlate) | |
59 | (struct acpi_dma_spec *, struct acpi_dma *), | |
60 | void *data); | |
61 | int acpi_dma_controller_free(struct device *dev); | |
62 | int devm_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 | void devm_acpi_dma_controller_free(struct device *dev); | |
67 | ||
68 | struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev, | |
69 | size_t index); | |
70 | struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev, | |
71 | const char *name); | |
72 | ||
73 | struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec, | |
74 | struct acpi_dma *adma); | |
75 | #else | |
76 | ||
77 | static inline int acpi_dma_controller_register(struct device *dev, | |
78 | struct dma_chan *(*acpi_dma_xlate) | |
79 | (struct acpi_dma_spec *, struct acpi_dma *), | |
80 | void *data) | |
81 | { | |
82 | return -ENODEV; | |
83 | } | |
84 | static inline int acpi_dma_controller_free(struct device *dev) | |
85 | { | |
86 | return -ENODEV; | |
87 | } | |
88 | static inline int devm_acpi_dma_controller_register(struct device *dev, | |
89 | struct dma_chan *(*acpi_dma_xlate) | |
90 | (struct acpi_dma_spec *, struct acpi_dma *), | |
91 | void *data) | |
92 | { | |
93 | return -ENODEV; | |
94 | } | |
95 | static inline void devm_acpi_dma_controller_free(struct device *dev) | |
96 | { | |
97 | } | |
98 | ||
99 | static inline struct dma_chan *acpi_dma_request_slave_chan_by_index( | |
100 | struct device *dev, size_t index) | |
101 | { | |
102 | return NULL; | |
103 | } | |
104 | static inline struct dma_chan *acpi_dma_request_slave_chan_by_name( | |
105 | struct device *dev, const char *name) | |
106 | { | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | #define acpi_dma_simple_xlate NULL | |
111 | ||
112 | #endif | |
113 | ||
114 | #define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index | |
115 | ||
116 | #endif /* __LINUX_ACPI_DMA_H */ |