/* 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/list.h>
|
#include <linux/device.h>
|
#include <linux/err.h>
|
#include <linux/dmaengine.h>
|
|
/**
|
* 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);
|
void devm_acpi_dma_controller_free(struct device *dev);
|
|
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 void devm_acpi_dma_controller_free(struct device *dev)
|
{
|
}
|
|
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 */
|
