tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */