include/asm-avr32/dma-mapping.h

   1 /*
   2  * Copyright (C) 2006 Atmel Corporation
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22 #ifndef __ASM_AVR32_DMA_MAPPING_H
  23 #define __ASM_AVR32_DMA_MAPPING_H
  24
  25 #include <asm/io.h>
  26 #include <asm/arch/cacheflush.h>
  27
  28 enum dma_data_direction {
  29         DMA_BIDIRECTIONAL       = 0,
  30         DMA_TO_DEVICE           = 1,
  31         DMA_FROM_DEVICE         = 2,
  32 };
  33 extern void *dma_alloc_coherent(size_t len, unsigned long *handle);
  34
  35 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  36                                            enum dma_data_direction dir)
  37 {
  38         extern void __bad_dma_data_direction(void);
  39
  40         switch (dir) {
  41         case DMA_BIDIRECTIONAL:
  42                 dcache_flush_range(vaddr, len);
  43                 break;
  44         case DMA_TO_DEVICE:
  45                 dcache_clean_range(vaddr, len);
  46                 break;
  47         case DMA_FROM_DEVICE:
  48                 dcache_invalidate_range(vaddr, len);
  49                 break;
  50         default:
  51                 /* This will cause a linker error */
  52                 __bad_dma_data_direction();
  53         }
  54
  55         return virt_to_phys(vaddr);
  56 }
  57
  58 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  59                                     unsigned long paddr)
  60 {
  61
  62 }
  63
  64 #endif /* __ASM_AVR32_DMA_MAPPING_H */