1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* 2 /*
3 * ACPI helpers for DMA request / controller 3 * ACPI helpers for DMA request / controller
4 * 4 *
5 * Based on of_dma.h 5 * Based on of_dma.h
6 * 6 *
7 * Copyright (C) 2013, Intel Corporation 7 * Copyright (C) 2013, Intel Corporation
8 * Author: Andy Shevchenko <andriy.shevchenko@ 8 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
9 */ 9 */
10 10
11 #ifndef __LINUX_ACPI_DMA_H 11 #ifndef __LINUX_ACPI_DMA_H
12 #define __LINUX_ACPI_DMA_H 12 #define __LINUX_ACPI_DMA_H
13 13
14 #include <linux/list.h> 14 #include <linux/list.h>
15 #include <linux/device.h> 15 #include <linux/device.h>
16 #include <linux/err.h> 16 #include <linux/err.h>
17 #include <linux/dmaengine.h> 17 #include <linux/dmaengine.h>
18 18
19 /** 19 /**
20 * struct acpi_dma_spec - slave device DMA res 20 * struct acpi_dma_spec - slave device DMA resources
21 * @chan_id: channel unique id 21 * @chan_id: channel unique id
22 * @slave_id: request line unique id 22 * @slave_id: request line unique id
23 * @dev: struct device of the DMA contr 23 * @dev: struct device of the DMA controller to be used in the filter
24 * function 24 * function
25 */ 25 */
26 struct acpi_dma_spec { 26 struct acpi_dma_spec {
27 int chan_id; 27 int chan_id;
28 int slave_id; 28 int slave_id;
29 struct device *dev; 29 struct device *dev;
30 }; 30 };
31 31
32 /** 32 /**
33 * struct acpi_dma - representation of the reg 33 * struct acpi_dma - representation of the registered DMAC
34 * @dma_controllers: linked list node 34 * @dma_controllers: linked list node
35 * @dev: struct device of this 35 * @dev: struct device of this controller
36 * @acpi_dma_xlate: callback function to f 36 * @acpi_dma_xlate: callback function to find a suitable channel
37 * @data: private data used by a 37 * @data: private data used by a callback function
38 * @base_request_line: first supported reques 38 * @base_request_line: first supported request line (CSRT)
39 * @end_request_line: last supported request 39 * @end_request_line: last supported request line (CSRT)
40 */ 40 */
41 struct acpi_dma { 41 struct acpi_dma {
42 struct list_head dma_controller 42 struct list_head dma_controllers;
43 struct device *dev; 43 struct device *dev;
44 struct dma_chan *(*acpi_dma_xl 44 struct dma_chan *(*acpi_dma_xlate)
45 (struct acpi_d 45 (struct acpi_dma_spec *, struct acpi_dma *);
46 void *data; 46 void *data;
47 unsigned short base_request_l 47 unsigned short base_request_line;
48 unsigned short end_request_li 48 unsigned short end_request_line;
49 }; 49 };
50 50
51 /* Used with acpi_dma_simple_xlate() */ 51 /* Used with acpi_dma_simple_xlate() */
52 struct acpi_dma_filter_info { 52 struct acpi_dma_filter_info {
53 dma_cap_mask_t dma_cap; 53 dma_cap_mask_t dma_cap;
54 dma_filter_fn filter_fn; 54 dma_filter_fn filter_fn;
55 }; 55 };
56 56
57 #ifdef CONFIG_DMA_ACPI 57 #ifdef CONFIG_DMA_ACPI
58 58
59 int acpi_dma_controller_register(struct device 59 int acpi_dma_controller_register(struct device *dev,
60 struct dma_chan *(*acpi_dma_xl 60 struct dma_chan *(*acpi_dma_xlate)
61 (struct acpi_dma_spec *, struc 61 (struct acpi_dma_spec *, struct acpi_dma *),
62 void *data); 62 void *data);
63 int acpi_dma_controller_free(struct device *de 63 int acpi_dma_controller_free(struct device *dev);
64 int devm_acpi_dma_controller_register(struct d 64 int devm_acpi_dma_controller_register(struct device *dev,
65 struct dma_chan *(*acpi_dma_xl 65 struct dma_chan *(*acpi_dma_xlate)
66 (struct acpi_dma_spec *, struc 66 (struct acpi_dma_spec *, struct acpi_dma *),
67 void *data); 67 void *data);
68 void devm_acpi_dma_controller_free(struct devi 68 void devm_acpi_dma_controller_free(struct device *dev);
69 69
70 struct dma_chan *acpi_dma_request_slave_chan_b 70 struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
71 71 size_t index);
72 struct dma_chan *acpi_dma_request_slave_chan_b 72 struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
73 73 const char *name);
74 74
75 struct dma_chan *acpi_dma_simple_xlate(struct 75 struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
76 struct 76 struct acpi_dma *adma);
77 #else 77 #else
78 78
79 static inline int acpi_dma_controller_register 79 static inline int acpi_dma_controller_register(struct device *dev,
80 struct dma_chan *(*acpi_dma_xl 80 struct dma_chan *(*acpi_dma_xlate)
81 (struct acpi_dma_spec *, struc 81 (struct acpi_dma_spec *, struct acpi_dma *),
82 void *data) 82 void *data)
83 { 83 {
84 return -ENODEV; 84 return -ENODEV;
85 } 85 }
86 static inline int acpi_dma_controller_free(str 86 static inline int acpi_dma_controller_free(struct device *dev)
87 { 87 {
88 return -ENODEV; 88 return -ENODEV;
89 } 89 }
90 static inline int devm_acpi_dma_controller_reg 90 static inline int devm_acpi_dma_controller_register(struct device *dev,
91 struct dma_chan *(*acpi_dma_xl 91 struct dma_chan *(*acpi_dma_xlate)
92 (struct acpi_dma_spec *, struc 92 (struct acpi_dma_spec *, struct acpi_dma *),
93 void *data) 93 void *data)
94 { 94 {
95 return -ENODEV; 95 return -ENODEV;
96 } 96 }
97 static inline void devm_acpi_dma_controller_fr 97 static inline void devm_acpi_dma_controller_free(struct device *dev)
98 { 98 {
99 } 99 }
100 100
101 static inline struct dma_chan *acpi_dma_reques 101 static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
102 struct device *dev, size_t ind 102 struct device *dev, size_t index)
103 { 103 {
104 return ERR_PTR(-ENODEV); 104 return ERR_PTR(-ENODEV);
105 } 105 }
106 static inline struct dma_chan *acpi_dma_reques 106 static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
107 struct device *dev, const char 107 struct device *dev, const char *name)
108 { 108 {
109 return ERR_PTR(-ENODEV); 109 return ERR_PTR(-ENODEV);
110 } 110 }
111 111
112 #define acpi_dma_simple_xlate NULL 112 #define acpi_dma_simple_xlate NULL
113 113
114 #endif 114 #endif
115 115
116 #define acpi_dma_request_slave_channel acpi_d 116 #define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index
117 117
118 #endif /* __LINUX_ACPI_DMA_H */ 118 #endif /* __LINUX_ACPI_DMA_H */
119 119
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