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/sh_dma.h>
17 #include <linux/shdma-base.h>
18 #include <linux/dmaengine.h>
19 #include <linux/interrupt.h>
20 #include <linux/list.h>
22 #define SH_DMAE_MAX_CHANNELS 20
23 #define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */
28 struct shdma_chan shdma_chan;
29 const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
30 int xmit_shift; /* log_2(bytes_per_xfer) */
32 char dev_id[16]; /* unique name per DMAC of channel */
34 dma_addr_t slave_addr;
37 struct sh_dmae_device {
38 struct shdma_dev shdma_dev;
39 struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
40 const struct sh_dmae_pdata *pdata;
41 struct list_head node;
42 void __iomem *chan_reg;
44 unsigned int chcr_offset;
49 u32 sar; /* SAR / source address */
50 u32 dar; /* DAR / destination address */
51 u32 tcr; /* TCR / transfer count */
55 struct sh_dmae_regs hw;
56 struct shdma_desc shdma_desc;
59 #define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
60 #define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
61 #define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
62 #define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
63 struct sh_dmae_device, shdma_dev.dma_dev)
65 #ifdef CONFIG_SH_DMAE_R8A73A4
66 extern const struct sh_dmae_pdata r8a73a4_dma_pdata;
67 #define r8a73a4_shdma_devid (&r8a73a4_dma_pdata)
69 #define r8a73a4_shdma_devid NULL
72 #endif /* __DMA_SHDMA_H */