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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
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* Copyright 2002 Integrated Device Technology, Inc.
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* All rights reserved.
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*
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* DMA register definition.
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*
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* Author : ryan.holmQVist@idt.com
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* Date : 20011005
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*/
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#ifndef _ASM_RC32434_DMA_V_H_
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#define _ASM_RC32434_DMA_V_H_
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#include <asm/mach-rc32434/dma.h>
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#include <asm/mach-rc32434/rc32434.h>
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#define DMA_CHAN_OFFSET 0x14
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#define IS_DMA_USED(X) (((X) & \
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(DMA_DESC_FINI | DMA_DESC_DONE | DMA_DESC_TERM)) \
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!= 0)
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#define DMA_COUNT(count) ((count) & DMA_DESC_COUNT_MSK)
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#define DMA_HALT_TIMEOUT 500
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static inline int rc32434_halt_dma(struct dma_reg *ch)
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{
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int timeout = 1;
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if (__raw_readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
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__raw_writel(0, &ch->dmac);
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for (timeout = DMA_HALT_TIMEOUT; timeout > 0; timeout--) {
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if (__raw_readl(&ch->dmas) & DMA_STAT_HALT) {
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__raw_writel(0, &ch->dmas);
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break;
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}
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}
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}
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return timeout ? 0 : 1;
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}
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static inline void rc32434_start_dma(struct dma_reg *ch, u32 dma_addr)
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{
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__raw_writel(0, &ch->dmandptr);
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__raw_writel(dma_addr, &ch->dmadptr);
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}
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static inline void rc32434_chain_dma(struct dma_reg *ch, u32 dma_addr)
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{
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__raw_writel(dma_addr, &ch->dmandptr);
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}
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#endif /* _ASM_RC32434_DMA_V_H_ */
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