kernel/arch/unicore32/include/mach/dma.h

   1 /*
   2  * linux/arch/unicore32/include/mach/dma.h
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   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 #ifndef __MACH_PUV3_DMA_H__
  13 #define __MACH_PUV3_DMA_H__
  14
  15 /*
  16  * The PKUnity has six internal DMA channels.
  17  */
  18 #define MAX_DMA_CHANNELS        6
  19
  20 typedef enum {
  21         DMA_PRIO_HIGH = 0,
  22         DMA_PRIO_MEDIUM = 1,
  23         DMA_PRIO_LOW = 2
  24 } puv3_dma_prio;
  25
  26 /*
  27  * DMA registration
  28  */
  29
  30 extern int puv3_request_dma(char *name,
  31                          puv3_dma_prio prio,
  32                          void (*irq_handler)(int, void *),
  33                          void (*err_handler)(int, void *),
  34                          void *data);
  35
  36 extern void puv3_free_dma(int dma_ch);
  37
  38 static inline void puv3_stop_dma(int ch)
  39 {
  40         writel(readl(DMAC_CONFIG(ch)) & ~DMAC_CONFIG_EN, DMAC_CONFIG(ch));
  41 }
  42
  43 static inline void puv3_resume_dma(int ch)
  44 {
  45         writel(readl(DMAC_CONFIG(ch)) | DMAC_CONFIG_EN, DMAC_CONFIG(ch));
  46 }
  47
  48 #endif /* __MACH_PUV3_DMA_H__ */