1/*
 2 * Renesas SuperH DMA Engine support
 3 *
 4 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
 5 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
 6 *
 7 * This is free software; you can redistribute it and/or modify
 8 * it under the terms of the GNU General Public License as published by
 9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13#ifndef __DMA_SHDMA_H
14#define __DMA_SHDMA_H
15
16#include <linux/dmaengine.h>
17#include <linux/interrupt.h>
18#include <linux/list.h>
19
20#define SH_DMAC_MAX_CHANNELS 20
21#define SH_DMA_SLAVE_NUMBER 256
22#define SH_DMA_TCR_MAX 0x00FFFFFF	/* 16MB */
23
24struct device;
25
26enum dmae_pm_state {
27	DMAE_PM_ESTABLISHED,
28	DMAE_PM_BUSY,
29	DMAE_PM_PENDING,
30};
31
32struct sh_dmae_chan {
33	spinlock_t desc_lock;		/* Descriptor operation lock */
34	struct list_head ld_queue;	/* Link descriptors queue */
35	struct list_head ld_free;	/* Link descriptors free */
36	struct dma_chan common;		/* DMA common channel */
37	struct device *dev;		/* Channel device */
38	struct tasklet_struct tasklet;	/* Tasklet */
39	int descs_allocated;		/* desc count */
40	int xmit_shift;			/* log_2(bytes_per_xfer) */
41	int irq;
42	int id;				/* Raw id of this channel */
43	u32 __iomem *base;
44	char dev_id[16];		/* unique name per DMAC of channel */
45	int pm_error;
46	enum dmae_pm_state pm_state;
47};
48
49struct sh_dmae_device {
50	struct dma_device common;
51	struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
52	struct sh_dmae_pdata *pdata;
53	struct list_head node;
54	u32 __iomem *chan_reg;
55	u16 __iomem *dmars;
56	unsigned int chcr_offset;
57	u32 chcr_ie_bit;
58};
59
60#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
61#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
62#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
63#define to_sh_dev(chan) container_of(chan->common.device,\
64				     struct sh_dmae_device, common)
65
66#endif	/* __DMA_SHDMA_H */