apps/include/cdi/dma.h

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU Lesser General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #ifndef _CDI_DMA_H_
  20 #define _CDI_DMA_H_
  21
  22 #include <sys/types.h>
  23 #include <dma.h>
  24 #include <string.h>
  25 #include <stdint.h>
  26
  27 // Geraet   => Speicher
  28 #define CDI_DMA_MODE_READ           DMA_MODE_READ
  29 // Speicher => Geraet
  30 #define CDI_DMA_MODE_WRITE          DMA_MODE_WRITE
  31 #define CDI_DMA_MODE_ON_DEMAND      DMA_MODE_ON_DEMAND
  32 #define CDI_DMA_MODE_SINGLE         DMA_MODE_SINGLE
  33 #define CDI_DMA_MODE_BLOCK          DMA_MODE_BLOCK
  34
  35 struct cdi_dma_handle {
  36   uint8_t channel;
  37   size_t length;
  38   uint8_t mode;
  39   void *buffer;
  40   void *dmabuf; ///< @note meinOS specific
  41 };
  42
  43 int cdi_dma_read(struct cdi_dma_handle *handle);
  44 int cdi_dma_write(struct cdi_dma_handle *handle);
  45 int cdi_dma_close(struct cdi_dma_handle *handle);
  46
  47 int cdi_dma_open(struct cdi_dma_handle *handle,uint8_t channel,uint8_t mode,size_t length,void* buffer);
  48
  49 #endif