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