LXR linux/drivers/dma/shdma.h

   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_DMAC_MAX_CHANNELS 6
  21#define SH_DMA_SLAVE_NUMBER 256
  22#define SH_DMA_TCR_MAX 0x00FFFFFF       /* 16MB */
  23
  24struct device;
  25
  26struct sh_dmae_chan {
  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) */
  36        int irq;
  37        int id;                         /* Raw id of this channel */
  38        u32 __iomem *base;
  39        char dev_id[16];                /* unique name per DMAC of channel */
  40};
  41
  42struct 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;
  48        u16 __iomem *dmars;
  49};
  50
  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)
  54
  55#endif  /* __DMA_SHDMA_H */
  56