2 * Renesas SuperH DMA Engine support
4 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
5 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
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.
16 #include <linux/dmaengine.h>
17 #include <linux/interrupt.h>
18 #include <linux/list.h>
20 #define SH_DMAC_MAX_CHANNELS 6
21 #define SH_DMA_SLAVE_NUMBER 256
22 #define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
27 dma_cookie_t completed_cookie; /* The maximum cookie completed */
28 spinlock_t desc_lock; /* Descriptor operation lock */
29 struct list_head ld_queue; /* Link descriptors queue */
30 struct list_head ld_free; /* Link descriptors free */
31 struct dma_chan common; /* DMA common channel */
32 struct device *dev; /* Channel device */
33 struct tasklet_struct tasklet; /* Tasklet */
34 int descs_allocated; /* desc count */
35 int xmit_shift; /* log_2(bytes_per_xfer) */
37 int id; /* Raw id of this channel */
39 char dev_id[16]; /* unique name per DMAC of channel */
42 struct sh_dmae_device {
43 struct dma_device common;
44 struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
45 struct sh_dmae_pdata *pdata;
46 struct list_head node;
47 u32 __iomem *chan_reg;
51 #define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
52 #define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
53 #define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
55 #endif /* __DMA_SHDMA_H */