LXR linux/arch/mips/include/asm/mach-rc32434/dma

   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
  25static 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
  41static 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
  47static 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