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

   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
  26 static 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
  42 static 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
  48 static 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_ */