1/*
2 *   This program is free software; you can redistribute it and/or modify it
3 *   under the terms of the GNU General Public License version 2 as published
4 *   by the Free Software Foundation.
5 *
6 *   This program is distributed in the hope that it will be useful,
7 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
8 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9 *   GNU General Public License for more details.
10 *
11 *   You should have received a copy of the GNU General Public License
12 *   along with this program; if not, write to the Free Software
13 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
14 *
15 *   Copyright (C) 2011 John Crispin <blogic@openwrt.org>
16 */
17
18#ifndef LTQ_DMA_H__
19#define LTQ_DMA_H__
20
21#define LTQ_DESC_SIZE		0x08	/* each descriptor is 64bit */
22#define LTQ_DESC_NUM		0x40	/* 64 descriptors / channel */
23
24#define LTQ_DMA_OWN		BIT(31) /* owner bit */
25#define LTQ_DMA_C		BIT(30) /* complete bit */
26#define LTQ_DMA_SOP		BIT(29) /* start of packet */
27#define LTQ_DMA_EOP		BIT(28) /* end of packet */
28#define LTQ_DMA_TX_OFFSET(x)	((x & 0x1f) << 23) /* data bytes offset */
29#define LTQ_DMA_RX_OFFSET(x)	((x & 0x7) << 23) /* data bytes offset */
30#define LTQ_DMA_SIZE_MASK	(0xffff) /* the size field is 16 bit */
31
32struct ltq_dma_desc {
33	u32 ctl;
34	u32 addr;
35};
36
37struct ltq_dma_channel {
38	int nr;				/* the channel number */
39	int irq;			/* the mapped irq */
40	int desc;			/* the current descriptor */
41	struct ltq_dma_desc *desc_base; /* the descriptor base */
42	int phys;			/* physical addr */
43};
44
45enum {
46	DMA_PORT_ETOP = 0,
47	DMA_PORT_DEU,
48};
49
50extern void ltq_dma_enable_irq(struct ltq_dma_channel *ch);
51extern void ltq_dma_disable_irq(struct ltq_dma_channel *ch);
52extern void ltq_dma_ack_irq(struct ltq_dma_channel *ch);
53extern void ltq_dma_open(struct ltq_dma_channel *ch);
54extern void ltq_dma_close(struct ltq_dma_channel *ch);
55extern void ltq_dma_alloc_tx(struct ltq_dma_channel *ch);
56extern void ltq_dma_alloc_rx(struct ltq_dma_channel *ch);
57extern void ltq_dma_free(struct ltq_dma_channel *ch);
58extern void ltq_dma_init_port(int p);
59
60#endif
61