release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/include/asm/mach-rc32434/dma_v.h

   1 /*
   2  * Copyright 2002 Integrated Device Technology, Inc.
   3  *              All rights reserved.
   4  *
   5  * DMA register definition.
   6  *
   7  * Author : ryan.holmQVist@idt.com
   8  * Date   : 20011005
   9  */
  10
  11 #ifndef _ASM_RC32434_DMA_V_H_
  12 #define _ASM_RC32434_DMA_V_H_
  13
  14 #include  <asm/mach-rc32434/dma.h>
  15 #include  <asm/mach-rc32434/rc32434.h>
  16
  17 #define DMA_CHAN_OFFSET         0x14
  18 #define IS_DMA_USED(X)          (((X) & \
  19                                 (DMA_DESC_FINI | DMA_DESC_DONE | DMA_DESC_TERM)) \
  20                                 != 0)
  21 #define DMA_COUNT(count)        ((count) & DMA_DESC_COUNT_MSK)
  22
  23 #define DMA_HALT_TIMEOUT        500
  24
  25 static inline int rc32434_halt_dma(struct dma_reg *ch)
  26 {
  27         int timeout = 1;
  28         if (__raw_readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
  29                 __raw_writel(0, &ch->dmac);
  30                 for (timeout = DMA_HALT_TIMEOUT; timeout > 0; timeout--) {
  31                         if (__raw_readl(&ch->dmas) & DMA_STAT_HALT) {
  32                                 __raw_writel(0, &ch->dmas);
  33                                 break;
  34                         }
  35                 }
  36         }
  37
  38         return timeout ? 0 : 1;
  39 }
  40
  41 static inline void rc32434_start_dma(struct dma_reg *ch, u32 dma_addr)
  42 {
  43         __raw_writel(0, &ch->dmandptr);
  44         __raw_writel(dma_addr, &ch->dmadptr);
  45 }
  46
  47 static inline void rc32434_chain_dma(struct dma_reg *ch, u32 dma_addr)
  48 {
  49         __raw_writel(dma_addr, &ch->dmandptr);
  50 }
  51
  52 #endif  /* _ASM_RC32434_DMA_V_H_ */