1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * ACPI helpers for DMA request / controller
7 * Copyright (C) 2013, Intel Corporation
8 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
11 #ifndef __LINUX_ACPI_DMA_H
12 #define __LINUX_ACPI_DMA_H
14 #include <linux/list.h>
15 #include <linux/device.h>
16 #include <linux/err.h>
17 #include <linux/dmaengine.h>
20 * struct acpi_dma_spec - slave device DMA resources
21 * @chan_id: channel unique id
22 * @slave_id: request line unique id
23 * @dev: struct device of the DMA controller to be used in the filter
26 struct acpi_dma_spec
{
33 * struct acpi_dma - representation of the registered DMAC
34 * @dma_controllers: linked list node
35 * @dev: struct device of this controller
36 * @acpi_dma_xlate: callback function to find a suitable channel
37 * @data: private data used by a callback function
38 * @base_request_line: first supported request line (CSRT)
39 * @end_request_line: last supported request line (CSRT)
42 struct list_head dma_controllers
;
44 struct dma_chan
*(*acpi_dma_xlate
)
45 (struct acpi_dma_spec
*, struct acpi_dma
*);
47 unsigned short base_request_line
;
48 unsigned short end_request_line
;
51 /* Used with acpi_dma_simple_xlate() */
52 struct acpi_dma_filter_info
{
53 dma_cap_mask_t dma_cap
;
54 dma_filter_fn filter_fn
;
57 #ifdef CONFIG_DMA_ACPI
59 int acpi_dma_controller_register(struct device
*dev
,
60 struct dma_chan
*(*acpi_dma_xlate
)
61 (struct acpi_dma_spec
*, struct acpi_dma
*),
63 int acpi_dma_controller_free(struct device
*dev
);
64 int devm_acpi_dma_controller_register(struct device
*dev
,
65 struct dma_chan
*(*acpi_dma_xlate
)
66 (struct acpi_dma_spec
*, struct acpi_dma
*),
68 void devm_acpi_dma_controller_free(struct device
*dev
);
70 struct dma_chan
*acpi_dma_request_slave_chan_by_index(struct device
*dev
,
72 struct dma_chan
*acpi_dma_request_slave_chan_by_name(struct device
*dev
,
75 struct dma_chan
*acpi_dma_simple_xlate(struct acpi_dma_spec
*dma_spec
,
76 struct acpi_dma
*adma
);
79 static inline int acpi_dma_controller_register(struct device
*dev
,
80 struct dma_chan
*(*acpi_dma_xlate
)
81 (struct acpi_dma_spec
*, struct acpi_dma
*),
86 static inline int acpi_dma_controller_free(struct device
*dev
)
90 static inline int devm_acpi_dma_controller_register(struct device
*dev
,
91 struct dma_chan
*(*acpi_dma_xlate
)
92 (struct acpi_dma_spec
*, struct acpi_dma
*),
97 static inline void devm_acpi_dma_controller_free(struct device
*dev
)
101 static inline struct dma_chan
*acpi_dma_request_slave_chan_by_index(
102 struct device
*dev
, size_t index
)
104 return ERR_PTR(-ENODEV
);
106 static inline struct dma_chan
*acpi_dma_request_slave_chan_by_name(
107 struct device
*dev
, const char *name
)
109 return ERR_PTR(-ENODEV
);
112 #define acpi_dma_simple_xlate NULL
116 #define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index
118 #endif /* __LINUX_ACPI_DMA_H */