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Linux/arch/mips/include/asm/mach-rc32434/dma_v.h

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  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_ */
 53 

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