51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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*
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* Copyright (C) 2011 John Crispin <john@phrozen.org>
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*/
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#ifndef LTQ_DMA_H__
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#define LTQ_DMA_H__
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#define LTQ_DESC_SIZE 0x08 /* each descriptor is 64bit */
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#define LTQ_DESC_NUM 0xC0 /* 192 descriptors / channel */
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#define LTQ_DMA_OWN BIT(31) /* owner bit */
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#define LTQ_DMA_C BIT(30) /* complete bit */
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#define LTQ_DMA_SOP BIT(29) /* start of packet */
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#define LTQ_DMA_EOP BIT(28) /* end of packet */
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#define LTQ_DMA_TX_OFFSET(x) ((x & 0x1f) << 23) /* data bytes offset */
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#define LTQ_DMA_RX_OFFSET(x) ((x & 0x7) << 23) /* data bytes offset */
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#define LTQ_DMA_SIZE_MASK (0xffff) /* the size field is 16 bit */
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struct ltq_dma_desc {
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u32 ctl;
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u32 addr;
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};
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struct ltq_dma_channel {
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int nr; /* the channel number */
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int irq; /* the mapped irq */
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int desc; /* the current descriptor */
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struct ltq_dma_desc *desc_base; /* the descriptor base */
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int phys; /* physical addr */
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struct device *dev;
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};
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enum {
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DMA_PORT_ETOP = 0,
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DMA_PORT_DEU,
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};
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extern void ltq_dma_enable_irq(struct ltq_dma_channel *ch);
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extern void ltq_dma_disable_irq(struct ltq_dma_channel *ch);
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extern void ltq_dma_ack_irq(struct ltq_dma_channel *ch);
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extern void ltq_dma_open(struct ltq_dma_channel *ch);
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extern void ltq_dma_close(struct ltq_dma_channel *ch);
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extern void ltq_dma_alloc_tx(struct ltq_dma_channel *ch);
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extern void ltq_dma_alloc_rx(struct ltq_dma_channel *ch);
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extern void ltq_dma_free(struct ltq_dma_channel *ch);
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extern void ltq_dma_init_port(int p, int tx_burst, int rx_burst);
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#endif
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