65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* LPC32xx DMA Controller Interface
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*
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* Copyright (C) 2008 by NXP Semiconductors
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* @Author: Kevin Wells
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* @Descr: Definitions for LPC3250 chip
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* @References: NXP LPC3250 User's Guide
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*/
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#ifndef _LPC32XX_DMA_H
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#define _LPC32XX_DMA_H
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/*
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* DMA linked list structure used with a channel's LLI register;
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* refer to UM10326, "LPC32x0 and LPC32x0/01 User manual" - Rev. 3
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* tables 84, 85, 86 & 87 for details.
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*/
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struct lpc32xx_dmac_ll {
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u32 dma_src;
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u32 dma_dest;
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u32 next_lli;
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u32 next_ctrl;
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};
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/* control register definitions */
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#define DMAC_CHAN_INT_TC_EN (1 << 31) /* channel terminal count interrupt */
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#define DMAC_CHAN_DEST_AUTOINC (1 << 27) /* automatic destination increment */
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#define DMAC_CHAN_SRC_AUTOINC (1 << 26) /* automatic source increment */
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#define DMAC_CHAN_DEST_AHB1 (1 << 25) /* AHB1 master for dest. transfer */
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#define DMAC_CHAN_DEST_WIDTH_32 (1 << 22) /* Destination data width selection */
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#define DMAC_CHAN_SRC_WIDTH_32 (1 << 19) /* Source data width selection */
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#define DMAC_CHAN_DEST_BURST_1 0
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#define DMAC_CHAN_DEST_BURST_4 (1 << 15) /* Destination data burst size */
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#define DMAC_CHAN_SRC_BURST_1 0
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#define DMAC_CHAN_SRC_BURST_4 (1 << 12) /* Source data burst size */
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/*
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* config_ch register definitions
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* DMAC_CHAN_FLOW_D_xxx: flow control with DMA as the controller
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* DMAC_DEST_PERIP: Macro for loading destination peripheral
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* DMAC_SRC_PERIP: Macro for loading source peripheral
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*/
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#define DMAC_CHAN_FLOW_D_M2P (0x1 << 11)
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#define DMAC_CHAN_FLOW_D_P2M (0x2 << 11)
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#define DMAC_DEST_PERIP(n) (((n) & 0x1F) << 6)
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#define DMAC_SRC_PERIP(n) (((n) & 0x1F) << 1)
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/*
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* config_ch register definitions
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* (source and destination peripheral ID numbers).
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* These can be used with the DMAC_DEST_PERIP and DMAC_SRC_PERIP macros.
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*/
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#define DMA_PERID_NAND1 1
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/* Channel enable bit */
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#define DMAC_CHAN_ENABLE (1 << 0)
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int lpc32xx_dma_get_channel(void);
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int lpc32xx_dma_start_xfer(unsigned int channel,
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const struct lpc32xx_dmac_ll *desc, u32 config);
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int lpc32xx_dma_wait_status(unsigned int channel);
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#endif /* _LPC32XX_DMA_H */
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