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         struct dma_chan         *(*of_dma_xlate)
  25                                 (struct of_phandle_args *, struct of_dma *);
  26         void                    *of_dma_data;
  27 };
  28
  29 struct of_dma_filter_info {
  30         dma_cap_mask_t  dma_cap;
  31         dma_filter_fn   filter_fn;
  32 };
  33
  34 #ifdef CONFIG_OF
  35 extern int of_dma_controller_register(struct device_node *np,
  36                 struct dma_chan *(*of_dma_xlate)
  37                 (struct of_phandle_args *, struct of_dma *),
  38                 void *data);
  39 extern void of_dma_controller_free(struct device_node *np);
  40 extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
  41                                                      const char *name);
  42 extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
  43                 struct of_dma *ofdma);
  44 #else
  45 static inline int of_dma_controller_register(struct device_node *np,
  46                 struct dma_chan *(*of_dma_xlate)
  47                 (struct of_phandle_args *, struct of_dma *),
  48                 void *data)
  49 {
  50         return -ENODEV;
  51 }
  52
  53 static inline void of_dma_controller_free(struct device_node *np)
  54 {
  55 }
  56
  57 static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
  58                                                      const char *name)
  59 {
  60         return NULL;
  61 }
  62
  63 static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
  64                 struct of_dma *ofdma)
  65 {
  66         return NULL;
  67 }
  68
  69 #endif
  70
  71 #endif /* __LINUX_OF_DMA_H */