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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright 2002 Integrated Device Technology, Inc.
   4 *              All rights reserved.
   5 *
   6 * DMA register definition.
   7 *
   8 * Author : ryan.holmQVist@idt.com
   9 * Date   : 20011005
  10 */
  11
  12#ifndef _ASM_RC32434_DMA_V_H_
  13#define _ASM_RC32434_DMA_V_H_
  14
  15#include  <asm/mach-rc32434/dma.h>
  16#include  <asm/mach-rc32434/rc32434.h>
  17
  18#define DMA_CHAN_OFFSET         0x14
  19#define IS_DMA_USED(X)          (((X) & \
  20                                (DMA_DESC_FINI | DMA_DESC_DONE | DMA_DESC_TERM)) \
  21                                != 0)
  22#define DMA_COUNT(count)        ((count) & DMA_DESC_COUNT_MSK)
  23
  24#define DMA_HALT_TIMEOUT        500
  25
  26static inline int rc32434_halt_dma(struct dma_reg *ch)
  27{
  28        int timeout = 1;
  29        if (__raw_readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
  30                __raw_writel(0, &ch->dmac);
  31                for (timeout = DMA_HALT_TIMEOUT; timeout > 0; timeout--) {
  32                        if (__raw_readl(&ch->dmas) & DMA_STAT_HALT) {
  33                                __raw_writel(0, &ch->dmas);
  34                                break;
  35                        }
  36                }
  37        }
  38
  39        return timeout ? 0 : 1;
  40}
  41
  42static inline void rc32434_start_dma(struct dma_reg *ch, u32 dma_addr)
  43{
  44        __raw_writel(0, &ch->dmandptr);
  45        __raw_writel(dma_addr, &ch->dmadptr);
  46}
  47
  48static inline void rc32434_chain_dma(struct dma_reg *ch, u32 dma_addr)
  49{
  50        __raw_writel(dma_addr, &ch->dmandptr);
  51}
  52
  53#endif  /* _ASM_RC32434_DMA_V_H_ */
  54