shdma.h

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/*
 * Renesas SuperH DMA Engine support
 *
 * Copyright (C) 2009 Nobuhiro Iwamatsu <[email protected]>
 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */
#ifndef __DMA_SHDMA_H
#define __DMA_SHDMA_H

#include <linux/sh_dma.h>
#include <linux/shdma-base.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/list.h>

#define SH_DMAE_MAX_CHANNELS 20
#define SH_DMAE_TCR_MAX 0x00FFFFFF  /* 16MB */

struct device;

struct sh_dmae_chan {
    struct shdma_chan shdma_chan;
    const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
    int xmit_shift;         /* log_2(bytes_per_xfer) */
    u32 __iomem *base;
    char dev_id[16];        /* unique name per DMAC of channel */
    int pm_error;
};

struct sh_dmae_device {
    struct shdma_dev shdma_dev;
    struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
    struct sh_dmae_pdata *pdata;
    struct list_head node;
    u32 __iomem *chan_reg;
    u16 __iomem *dmars;
    unsigned int chcr_offset;
    u32 chcr_ie_bit;
};

struct sh_dmae_regs {
    u32 sar; /* SAR / source address */
    u32 dar; /* DAR / destination address */
    u32 tcr; /* TCR / transfer count */
};

struct sh_dmae_desc {
    struct sh_dmae_regs hw;
    struct shdma_desc shdma_desc;
};

#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
                     struct sh_dmae_device, shdma_dev.dma_dev)

#endif  /* __DMA_SHDMA_H */