include/linux/of_dma.h

   1 /*
   2  * OF helpers for DMA request / controller
   3  *
   4  * Based on of_gpio.h
   5  *
   6  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef __LINUX_OF_DMA_H
  14 #define __LINUX_OF_DMA_H
  15
  16 #include <linux/of.h>
  17 #include <linux/dmaengine.h>
  18
  19 struct device_node;
  20
  21 struct of_dma {
  22         struct list_head        of_dma_controllers;
  23         struct device_node      *of_node;
  24         int                     of_dma_nbcells;
  25         struct dma_chan         *(*of_dma_xlate)
  26                                 (struct of_phandle_args *, struct of_dma *);
  27         void                    *of_dma_data;
  28 };
  29
  30 struct of_dma_filter_info {
  31         dma_cap_mask_t  dma_cap;
  32         dma_filter_fn   filter_fn;
  33 };
  34
  35 #ifdef CONFIG_OF
  36 extern int of_dma_controller_register(struct device_node *np,
  37                 struct dma_chan *(*of_dma_xlate)
  38                 (struct of_phandle_args *, struct of_dma *),
  39                 void *data);
  40 extern void of_dma_controller_free(struct device_node *np);
  41 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
  42                                                      const char *name);
  43 extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
  44                 struct of_dma *ofdma);
  45 #else
  46 static inline int of_dma_controller_register(struct device_node *np,
  47                 struct dma_chan *(*of_dma_xlate)
  48                 (struct of_phandle_args *, struct of_dma *),
  49                 void *data)
  50 {
  51         return -ENODEV;
  52 }
  53
  54 static inline void of_dma_controller_free(struct device_node *np)
  55 {
  56 }
  57
  58 static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
  59                                                      const char *name)
  60 {
  61         return NULL;
  62 }
  63
  64 static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
  65                 struct of_dma *ofdma)
  66 {
  67         return NULL;
  68 }
  69
  70 #endif
  71
  72 #endif /* __LINUX_OF_DMA_H */