027811b9b8
The shdma dmaengine driver currently uses numerous macros to support various platforms, selected by ifdef's. Convert it to use platform device resources and lists of channel descriptors to specify register locations, interrupt numbers and other system-specific configuration variants. Unavoidably, we have to simultaneously convert all shdma users to provide those resources. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* Renesas SuperH DMA Engine support
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*
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* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
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* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#ifndef __DMA_SHDMA_H
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#define __DMA_SHDMA_H
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#include <linux/dmaengine.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
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struct sh_dmae_regs {
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u32 sar; /* SAR / source address */
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u32 dar; /* DAR / destination address */
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u32 tcr; /* TCR / transfer count */
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};
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struct sh_desc {
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struct sh_dmae_regs hw;
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struct list_head node;
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struct dma_async_tx_descriptor async_tx;
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enum dma_data_direction direction;
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dma_cookie_t cookie;
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int chunks;
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int mark;
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};
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struct device;
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struct sh_dmae_chan {
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dma_cookie_t completed_cookie; /* The maximum cookie completed */
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spinlock_t desc_lock; /* Descriptor operation lock */
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struct list_head ld_queue; /* Link descriptors queue */
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struct list_head ld_free; /* Link descriptors free */
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struct dma_chan common; /* DMA common channel */
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struct device *dev; /* Channel device */
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struct tasklet_struct tasklet; /* Tasklet */
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int descs_allocated; /* desc count */
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int xmit_shift; /* log_2(bytes_per_xfer) */
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int irq;
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int id; /* Raw id of this channel */
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u32 __iomem *base;
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char dev_id[16]; /* unique name per DMAC of channel */
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};
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struct sh_dmae_device {
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struct dma_device common;
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struct sh_dmae_chan *chan[MAX_DMA_CHANNELS];
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struct sh_dmae_pdata *pdata;
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u32 __iomem *chan_reg;
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u16 __iomem *dmars;
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};
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#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
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#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
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#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
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#endif /* __DMA_SHDMA_H */
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