diff options
Diffstat (limited to 'include/linux/acpi_dma.h')
-rw-r--r-- | include/linux/acpi_dma.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/include/linux/acpi_dma.h b/include/linux/acpi_dma.h new file mode 100644 index 000000000000..d09deabc7bf6 --- /dev/null +++ b/include/linux/acpi_dma.h | |||
@@ -0,0 +1,116 @@ | |||
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 */ | ||