/*
   * Renesas SuperH DMA Engine support
   *
   * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   * 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/dmaengine.h>

  #include <linux/interrupt.h>
  #include <linux/list.h>

  #define SH_DMAC_MAX_CHANNELS 20

  #define SH_DMA_SLAVE_NUMBER 256

  #define SH_DMA_TCR_MAX 0x00FFFFFF	/* 16MB */

  struct device;

  enum dmae_pm_state {
  	DMAE_PM_ESTABLISHED,
  	DMAE_PM_BUSY,
  	DMAE_PM_PENDING,
  };

  struct sh_dmae_chan {
  	dma_cookie_t completed_cookie;	/* The maximum cookie completed */

  	spinlock_t desc_lock;		/* Descriptor operation lock */
  	struct list_head ld_queue;	/* Link descriptors queue */
  	struct list_head ld_free;	/* Link descriptors free */
  	struct dma_chan common;		/* DMA common channel */
  	struct device *dev;		/* Channel device */

  	struct tasklet_struct tasklet;	/* Tasklet */

  	int descs_allocated;		/* desc count */

  	int xmit_shift;			/* log_2(bytes_per_xfer) */

  	int irq;

  	int id;				/* Raw id of this channel */

  	u32 __iomem *base;

  	char dev_id[16];		/* unique name per DMAC of channel */

  	int pm_error;

  	enum dmae_pm_state pm_state;

  };
  
  struct sh_dmae_device {
  	struct dma_device common;

  	struct sh_dmae_chan *chan[SH_DMAC_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;

  };
  
  #define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
  #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->common.device,\
  				     struct sh_dmae_device, common)

  
  #endif	/* __DMA_SHDMA_H */