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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116/* 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 */