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

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  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_ */
 54 

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