tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
21
22struct sh_dmae_regs {
23 u32 sar; /* SAR / source address */
24 u32 dar; /* DAR / destination address */
25 u32 tcr; /* TCR / transfer count */
26};
27
28struct sh_desc {
29 struct sh_dmae_regs hw;
30 struct list_head node;
31 struct dma_async_tx_descriptor async_tx;
32 dma_cookie_t cookie;
33 int chunks;
34 int mark;
35};
36
37struct device;
38
39struct sh_dmae_chan {
40 dma_cookie_t completed_cookie; /* The maximum cookie completed */
41 spinlock_t desc_lock; /* Descriptor operation lock */
42 struct list_head ld_queue; /* Link descriptors queue */
43 struct list_head ld_free; /* Link descriptors free */
44 struct dma_chan common; /* DMA common channel */
45 struct device *dev; /* Channel device */
46 struct tasklet_struct tasklet; /* Tasklet */
47 int descs_allocated; /* desc count */
48 int id; /* Raw id of this channel */
49 char dev_id[16]; /* unique name per DMAC of channel */
50
51 /* Set chcr */
52 int (*set_chcr)(struct sh_dmae_chan *sh_chan, u32 regs);
53 /* Set DMA resource */
54 int (*set_dmars)(struct sh_dmae_chan *sh_chan, u16 res);
55};
56
57struct sh_dmae_device {
58 struct dma_device common;
59 struct sh_dmae_chan *chan[MAX_DMA_CHANNELS];
60 struct sh_dmae_pdata pdata;
61};
62
63#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
64#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
65#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
66
67#endif /* __DMA_SHDMA_H */