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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123/* SPDX-License-Identifier: GPL-2.0 *//* * OF helpers for DMA request / controller * * Based on of_gpio.h * * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ */
#ifndef __LINUX_OF_DMA_H#define __LINUX_OF_DMA_H
#include <linux/of.h>#include <linux/dmaengine.h>
struct device_node;
struct of_dma { struct list_head of_dma_controllers; struct device_node *of_node; struct dma_chan *(*of_dma_xlate) (struct of_phandle_args *, struct of_dma *); void *(*of_dma_route_allocate) (struct of_phandle_args *, struct of_dma *); struct dma_router *dma_router; void *of_dma_data;};
struct of_dma_filter_info { dma_cap_mask_t dma_cap; dma_filter_fn filter_fn;};
#ifdef CONFIG_DMA_OFextern int of_dma_controller_register(struct device_node *np, struct dma_chan *(*of_dma_xlate) (struct of_phandle_args *, struct of_dma *), void *data);extern void of_dma_controller_free(struct device_node *np);
static void __of_dma_controller_free(void *np){ of_dma_controller_free(np);}
static inline intdevm_of_dma_controller_register(struct device *dev, struct device_node *np, struct dma_chan *(*of_dma_xlate) (struct of_phandle_args *, struct of_dma *), void *data){ int ret;
ret = of_dma_controller_register(np, of_dma_xlate, data); if (ret) return ret;
return devm_add_action_or_reset(dev, __of_dma_controller_free, np);}
extern int of_dma_router_register(struct device_node *np, void *(*of_dma_route_allocate) (struct of_phandle_args *, struct of_dma *), struct dma_router *dma_router);#define of_dma_router_free of_dma_controller_free
extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, const char *name);extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma);extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, struct of_dma *ofdma);
#elsestatic inline int of_dma_controller_register(struct device_node *np, struct dma_chan *(*of_dma_xlate) (struct of_phandle_args *, struct of_dma *), void *data){ return -ENODEV;}
static inline void of_dma_controller_free(struct device_node *np){}
static inline intdevm_of_dma_controller_register(struct device *dev, struct device_node *np, struct dma_chan *(*of_dma_xlate) (struct of_phandle_args *, struct of_dma *), void *data){ return -ENODEV;}
static inline int of_dma_router_register(struct device_node *np, void *(*of_dma_route_allocate) (struct of_phandle_args *, struct of_dma *), struct dma_router *dma_router){ return -ENODEV;}
#define of_dma_router_free of_dma_controller_free
static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, const char *name){ return ERR_PTR(-ENODEV);}
static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma){ return NULL;}
#define of_dma_xlate_by_chan_id NULL
#endif
#endif /* __LINUX_OF_DMA_H */