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 <john@phrozen.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 
32 struct ltq_dma_desc {
33 	u32 ctl;
34 	u32 addr;
35 };
36 
37 struct 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 
45 enum {
46 	DMA_PORT_ETOP = 0,
47 	DMA_PORT_DEU,
48 };
49 
50 extern void ltq_dma_enable_irq(struct ltq_dma_channel *ch);
51 extern void ltq_dma_disable_irq(struct ltq_dma_channel *ch);
52 extern void ltq_dma_ack_irq(struct ltq_dma_channel *ch);
53 extern void ltq_dma_open(struct ltq_dma_channel *ch);
54 extern void ltq_dma_close(struct ltq_dma_channel *ch);
55 extern void ltq_dma_alloc_tx(struct ltq_dma_channel *ch);
56 extern void ltq_dma_alloc_rx(struct ltq_dma_channel *ch);
57 extern void ltq_dma_free(struct ltq_dma_channel *ch);
58 extern void ltq_dma_init_port(int p);
59 
60 #endif
61