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 20
  21 #define SH_DMA_SLAVE_NUMBER 256
  22 #define SH_DMA_TCR_MAX 0x00FFFFFF       /* 16MB */
  23
  24 struct device;
  25
  26 struct 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         int pm_error;
  41 };
  42
  43 struct sh_dmae_device {
  44         struct dma_device common;
  45         struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
  46         struct sh_dmae_pdata *pdata;
  47         struct list_head node;
  48         u32 __iomem *chan_reg;
  49         u16 __iomem *dmars;
  50         unsigned int chcr_offset;
  51         u32 chcr_ie_bit;
  52 };
  53
  54 #define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
  55 #define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
  56 #define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
  57 #define to_sh_dev(chan) container_of(chan->common.device,\
  58                                      struct sh_dmae_device, common)
  59
  60 #endif  /* __DMA_SHDMA_H */