IO_DMA1 - FreeBSD

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#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */

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#define DMA1_STATUS (IO_DMA1 + 1*8) /* status register */

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#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */

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#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */

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#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */

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#define DMA1_RESET (IO_DMA1 + 1*13) /* reset */