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118 lines
3.1 KiB
118 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* ACPI helpers for DMA request / controller |
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* |
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* Based on of_dma.h |
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* |
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* Copyright (C) 2013, Intel Corporation |
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* Author: Andy Shevchenko <[email protected]> |
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*/ |
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#ifndef __LINUX_ACPI_DMA_H |
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#define __LINUX_ACPI_DMA_H |
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#include <linux/list.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/dmaengine.h> |
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/** |
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* struct acpi_dma_spec - slave device DMA resources |
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* @chan_id: channel unique id |
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* @slave_id: request line unique id |
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* @dev: struct device of the DMA controller to be used in the filter |
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* function |
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*/ |
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struct acpi_dma_spec { |
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int chan_id; |
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int slave_id; |
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struct device *dev; |
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}; |
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/** |
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* struct acpi_dma - representation of the registered DMAC |
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* @dma_controllers: linked list node |
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* @dev: struct device of this controller |
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* @acpi_dma_xlate: callback function to find a suitable channel |
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* @data: private data used by a callback function |
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* @base_request_line: first supported request line (CSRT) |
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* @end_request_line: last supported request line (CSRT) |
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*/ |
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struct acpi_dma { |
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struct list_head dma_controllers; |
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struct device *dev; |
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struct dma_chan *(*acpi_dma_xlate) |
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(struct acpi_dma_spec *, struct acpi_dma *); |
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void *data; |
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unsigned short base_request_line; |
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unsigned short end_request_line; |
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}; |
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/* Used with acpi_dma_simple_xlate() */ |
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struct acpi_dma_filter_info { |
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dma_cap_mask_t dma_cap; |
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dma_filter_fn filter_fn; |
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}; |
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#ifdef CONFIG_DMA_ACPI |
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int acpi_dma_controller_register(struct device *dev, |
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struct dma_chan *(*acpi_dma_xlate) |
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(struct acpi_dma_spec *, struct acpi_dma *), |
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void *data); |
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int acpi_dma_controller_free(struct device *dev); |
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int devm_acpi_dma_controller_register(struct device *dev, |
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struct dma_chan *(*acpi_dma_xlate) |
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(struct acpi_dma_spec *, struct acpi_dma *), |
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void *data); |
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void devm_acpi_dma_controller_free(struct device *dev); |
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struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev, |
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size_t index); |
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struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev, |
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const char *name); |
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struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec, |
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struct acpi_dma *adma); |
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#else |
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static inline int acpi_dma_controller_register(struct device *dev, |
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struct dma_chan *(*acpi_dma_xlate) |
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(struct acpi_dma_spec *, struct acpi_dma *), |
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void *data) |
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{ |
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return -ENODEV; |
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} |
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static inline int acpi_dma_controller_free(struct device *dev) |
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{ |
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return -ENODEV; |
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} |
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static inline int devm_acpi_dma_controller_register(struct device *dev, |
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struct dma_chan *(*acpi_dma_xlate) |
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(struct acpi_dma_spec *, struct acpi_dma *), |
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void *data) |
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{ |
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return -ENODEV; |
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} |
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static inline void devm_acpi_dma_controller_free(struct device *dev) |
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{ |
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} |
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static inline struct dma_chan *acpi_dma_request_slave_chan_by_index( |
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struct device *dev, size_t index) |
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{ |
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return ERR_PTR(-ENODEV); |
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} |
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static inline struct dma_chan *acpi_dma_request_slave_chan_by_name( |
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struct device *dev, const char *name) |
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{ |
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return ERR_PTR(-ENODEV); |
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} |
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#define acpi_dma_simple_xlate NULL |
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#endif |
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#define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index |
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#endif /* __LINUX_ACPI_DMA_H */
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