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500404ebcb
of_dma_request_slave_channel should return either pointer for valid dma_chan or ERR_PTR() error code, NULL is not expected to be returned. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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