forked from mirrors/linux
d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/* 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 <andriy.shevchenko@linux.intel.com>
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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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