1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *
4 *   Copyright (C) 2011 John Crispin <john@phrozen.org>
5 */
6
7#ifndef LTQ_DMA_H__
8#define LTQ_DMA_H__
9
10#define LTQ_DESC_SIZE		0x08	/* each descriptor is 64bit */
11#define LTQ_DESC_NUM		0xC0	/* 192 descriptors / channel */
12
13#define LTQ_DMA_OWN		BIT(31) /* owner bit */
14#define LTQ_DMA_C		BIT(30) /* complete bit */
15#define LTQ_DMA_SOP		BIT(29) /* start of packet */
16#define LTQ_DMA_EOP		BIT(28) /* end of packet */
17#define LTQ_DMA_TX_OFFSET(x)	((x & 0x1f) << 23) /* data bytes offset */
18#define LTQ_DMA_RX_OFFSET(x)	((x & 0x7) << 23) /* data bytes offset */
19#define LTQ_DMA_SIZE_MASK	(0xffff) /* the size field is 16 bit */
20
21struct ltq_dma_desc {
22	u32 ctl;
23	u32 addr;
24};
25
26struct ltq_dma_channel {
27	int nr;				/* the channel number */
28	int irq;			/* the mapped irq */
29	int desc;			/* the current descriptor */
30	struct ltq_dma_desc *desc_base; /* the descriptor base */
31	int phys;			/* physical addr */
32	struct device *dev;
33};
34
35enum {
36	DMA_PORT_ETOP = 0,
37	DMA_PORT_DEU,
38};
39
40extern void ltq_dma_enable_irq(struct ltq_dma_channel *ch);
41extern void ltq_dma_disable_irq(struct ltq_dma_channel *ch);
42extern void ltq_dma_ack_irq(struct ltq_dma_channel *ch);
43extern void ltq_dma_open(struct ltq_dma_channel *ch);
44extern void ltq_dma_close(struct ltq_dma_channel *ch);
45extern void ltq_dma_alloc_tx(struct ltq_dma_channel *ch);
46extern void ltq_dma_alloc_rx(struct ltq_dma_channel *ch);
47extern void ltq_dma_free(struct ltq_dma_channel *ch);
48extern void ltq_dma_init_port(int p, int tx_burst, int rx_burst);
49
50#endif
51