1 /* SPDX-License-Identifier: GPL-2.0-only */ <<
2 /* 1 /*
3 * ACPI helpers for DMA request / controller 2 * ACPI helpers for DMA request / controller
4 * 3 *
5 * Based on of_dma.h 4 * Based on of_dma.h
6 * 5 *
7 * Copyright (C) 2013, Intel Corporation 6 * Copyright (C) 2013, Intel Corporation
8 * Author: Andy Shevchenko <andriy.shevchenko@ 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.
9 */ 12 */
10 13
11 #ifndef __LINUX_ACPI_DMA_H 14 #ifndef __LINUX_ACPI_DMA_H
12 #define __LINUX_ACPI_DMA_H 15 #define __LINUX_ACPI_DMA_H
13 16
14 #include <linux/list.h> 17 #include <linux/list.h>
15 #include <linux/device.h> 18 #include <linux/device.h>
16 #include <linux/err.h> 19 #include <linux/err.h>
17 #include <linux/dmaengine.h> 20 #include <linux/dmaengine.h>
18 21
19 /** 22 /**
20 * struct acpi_dma_spec - slave device DMA res 23 * struct acpi_dma_spec - slave device DMA resources
21 * @chan_id: channel unique id 24 * @chan_id: channel unique id
22 * @slave_id: request line unique id 25 * @slave_id: request line unique id
23 * @dev: struct device of the DMA contr 26 * @dev: struct device of the DMA controller to be used in the filter
24 * function 27 * function
25 */ 28 */
26 struct acpi_dma_spec { 29 struct acpi_dma_spec {
27 int chan_id; 30 int chan_id;
28 int slave_id; 31 int slave_id;
29 struct device *dev; 32 struct device *dev;
30 }; 33 };
31 34
32 /** 35 /**
33 * struct acpi_dma - representation of the reg 36 * struct acpi_dma - representation of the registered DMAC
34 * @dma_controllers: linked list node 37 * @dma_controllers: linked list node
35 * @dev: struct device of this 38 * @dev: struct device of this controller
36 * @acpi_dma_xlate: callback function to f 39 * @acpi_dma_xlate: callback function to find a suitable channel
37 * @data: private data used by a 40 * @data: private data used by a callback function
38 * @base_request_line: first supported reques 41 * @base_request_line: first supported request line (CSRT)
39 * @end_request_line: last supported request 42 * @end_request_line: last supported request line (CSRT)
40 */ 43 */
41 struct acpi_dma { 44 struct acpi_dma {
42 struct list_head dma_controller 45 struct list_head dma_controllers;
43 struct device *dev; 46 struct device *dev;
44 struct dma_chan *(*acpi_dma_xl 47 struct dma_chan *(*acpi_dma_xlate)
45 (struct acpi_d 48 (struct acpi_dma_spec *, struct acpi_dma *);
46 void *data; 49 void *data;
47 unsigned short base_request_l 50 unsigned short base_request_line;
48 unsigned short end_request_li 51 unsigned short end_request_line;
49 }; 52 };
50 53
51 /* Used with acpi_dma_simple_xlate() */ 54 /* Used with acpi_dma_simple_xlate() */
52 struct acpi_dma_filter_info { 55 struct acpi_dma_filter_info {
53 dma_cap_mask_t dma_cap; 56 dma_cap_mask_t dma_cap;
54 dma_filter_fn filter_fn; 57 dma_filter_fn filter_fn;
55 }; 58 };
56 59
57 #ifdef CONFIG_DMA_ACPI 60 #ifdef CONFIG_DMA_ACPI
58 61
59 int acpi_dma_controller_register(struct device 62 int acpi_dma_controller_register(struct device *dev,
60 struct dma_chan *(*acpi_dma_xl 63 struct dma_chan *(*acpi_dma_xlate)
61 (struct acpi_dma_spec *, struc 64 (struct acpi_dma_spec *, struct acpi_dma *),
62 void *data); 65 void *data);
63 int acpi_dma_controller_free(struct device *de 66 int acpi_dma_controller_free(struct device *dev);
64 int devm_acpi_dma_controller_register(struct d 67 int devm_acpi_dma_controller_register(struct device *dev,
65 struct dma_chan *(*acpi_dma_xl 68 struct dma_chan *(*acpi_dma_xlate)
66 (struct acpi_dma_spec *, struc 69 (struct acpi_dma_spec *, struct acpi_dma *),
67 void *data); 70 void *data);
68 void devm_acpi_dma_controller_free(struct devi 71 void devm_acpi_dma_controller_free(struct device *dev);
69 72
70 struct dma_chan *acpi_dma_request_slave_chan_b 73 struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
71 74 size_t index);
72 struct dma_chan *acpi_dma_request_slave_chan_b 75 struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
73 76 const char *name);
74 77
75 struct dma_chan *acpi_dma_simple_xlate(struct 78 struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
76 struct 79 struct acpi_dma *adma);
77 #else 80 #else
78 81
79 static inline int acpi_dma_controller_register 82 static inline int acpi_dma_controller_register(struct device *dev,
80 struct dma_chan *(*acpi_dma_xl 83 struct dma_chan *(*acpi_dma_xlate)
81 (struct acpi_dma_spec *, struc 84 (struct acpi_dma_spec *, struct acpi_dma *),
82 void *data) 85 void *data)
83 { 86 {
84 return -ENODEV; 87 return -ENODEV;
85 } 88 }
86 static inline int acpi_dma_controller_free(str 89 static inline int acpi_dma_controller_free(struct device *dev)
87 { 90 {
88 return -ENODEV; 91 return -ENODEV;
89 } 92 }
90 static inline int devm_acpi_dma_controller_reg 93 static inline int devm_acpi_dma_controller_register(struct device *dev,
91 struct dma_chan *(*acpi_dma_xl 94 struct dma_chan *(*acpi_dma_xlate)
92 (struct acpi_dma_spec *, struc 95 (struct acpi_dma_spec *, struct acpi_dma *),
93 void *data) 96 void *data)
94 { 97 {
95 return -ENODEV; 98 return -ENODEV;
96 } 99 }
97 static inline void devm_acpi_dma_controller_fr 100 static inline void devm_acpi_dma_controller_free(struct device *dev)
98 { 101 {
99 } 102 }
100 103
101 static inline struct dma_chan *acpi_dma_reques 104 static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
102 struct device *dev, size_t ind 105 struct device *dev, size_t index)
103 { 106 {
104 return ERR_PTR(-ENODEV); 107 return ERR_PTR(-ENODEV);
105 } 108 }
106 static inline struct dma_chan *acpi_dma_reques 109 static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
107 struct device *dev, const char 110 struct device *dev, const char *name)
108 { 111 {
109 return ERR_PTR(-ENODEV); 112 return ERR_PTR(-ENODEV);
110 } 113 }
111 114
112 #define acpi_dma_simple_xlate NULL 115 #define acpi_dma_simple_xlate NULL
113 116
114 #endif 117 #endif
115 118
116 #define acpi_dma_request_slave_channel acpi_d 119 #define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index
117 120
118 #endif /* __LINUX_ACPI_DMA_H */ 121 #endif /* __LINUX_ACPI_DMA_H */
119 122
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