03aa18f550
Presently DMA transfers are interrupted and aborted by the NMI. This implements some basic logic for more gracefully handling and clearing each controller's NMIF flag via the NMI die chain, needed to resume transfers post-NMI. Reported-by: Michael Szafranek <Michael.Szafranek@emtrion.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
55 lines
1.7 KiB
C
55 lines
1.7 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_DMAC_MAX_CHANNELS 6
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#define SH_DMA_SLAVE_NUMBER 256
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#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
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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[SH_DMAC_MAX_CHANNELS];
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struct sh_dmae_pdata *pdata;
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struct list_head node;
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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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