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93 lines
2.3 KiB
93 lines
2.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* OF helpers for DMA request / controller |
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* |
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* Based on of_gpio.h |
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* |
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ |
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*/ |
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#ifndef __LINUX_OF_DMA_H |
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#define __LINUX_OF_DMA_H |
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#include <linux/of.h> |
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#include <linux/dmaengine.h> |
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struct device_node; |
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struct of_dma { |
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struct list_head of_dma_controllers; |
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struct device_node *of_node; |
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struct dma_chan *(*of_dma_xlate) |
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(struct of_phandle_args *, struct of_dma *); |
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void *(*of_dma_route_allocate) |
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(struct of_phandle_args *, struct of_dma *); |
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struct dma_router *dma_router; |
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void *of_dma_data; |
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}; |
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struct of_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_OF |
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extern int of_dma_controller_register(struct device_node *np, |
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struct dma_chan *(*of_dma_xlate) |
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(struct of_phandle_args *, struct of_dma *), |
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void *data); |
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extern void of_dma_controller_free(struct device_node *np); |
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extern int of_dma_router_register(struct device_node *np, |
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void *(*of_dma_route_allocate) |
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(struct of_phandle_args *, struct of_dma *), |
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struct dma_router *dma_router); |
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#define of_dma_router_free of_dma_controller_free |
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extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, |
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const char *name); |
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extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, |
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struct of_dma *ofdma); |
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extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, |
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struct of_dma *ofdma); |
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#else |
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static inline int of_dma_controller_register(struct device_node *np, |
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struct dma_chan *(*of_dma_xlate) |
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(struct of_phandle_args *, struct of_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 of_dma_controller_free(struct device_node *np) |
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{ |
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} |
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static inline int of_dma_router_register(struct device_node *np, |
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void *(*of_dma_route_allocate) |
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(struct of_phandle_args *, struct of_dma *), |
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struct dma_router *dma_router) |
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{ |
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return -ENODEV; |
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} |
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#define of_dma_router_free of_dma_controller_free |
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static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, |
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const char *name) |
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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 *of_dma_simple_xlate(struct of_phandle_args *dma_spec, |
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struct of_dma *ofdma) |
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{ |
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return NULL; |
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} |
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#define of_dma_xlate_by_chan_id NULL |
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#endif |
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#endif /* __LINUX_OF_DMA_H */
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