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![Geert Uytterhoeven](/assets/img/avatar_default.png)
Renesas R-Mobile APE6 support is currently unused: - DMA slaves were never enabled in r8a73a4.dtsi, - The driver relies on legacy filter matching and describing all slaves and MID/RIDs in a table, unlike modern DMA engine drivers for similar hardware like rcar-dmac, - The driver doesn't seem to work well. Remove the driver, it can be resurrected from git history when needed. As this was the last user of SH_DMAE_BASE on Renesas ARM SoCs, the sh-dma-engine driver core is now used on SuperH only. Note that the DT bindings are still present, as r8a73a4.dtsi uses them. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Vinod Koul <vkoul@kernel.org>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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*/
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#ifndef __DMA_SHDMA_H
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#define __DMA_SHDMA_H
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#include <linux/sh_dma.h>
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#include <linux/shdma-base.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_DMAE_MAX_CHANNELS 20
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#define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */
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struct device;
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struct sh_dmae_chan {
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struct shdma_chan shdma_chan;
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const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
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int xmit_shift; /* log_2(bytes_per_xfer) */
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void __iomem *base;
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char dev_id[16]; /* unique name per DMAC of channel */
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int pm_error;
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dma_addr_t slave_addr;
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};
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struct sh_dmae_device {
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struct shdma_dev shdma_dev;
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struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
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const struct sh_dmae_pdata *pdata;
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struct list_head node;
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void __iomem *chan_reg;
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void __iomem *dmars;
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unsigned int chcr_offset;
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u32 chcr_ie_bit;
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};
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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_dmae_desc {
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struct sh_dmae_regs hw;
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struct shdma_desc shdma_desc;
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};
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#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
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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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#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
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struct sh_dmae_device, shdma_dev.dma_dev)
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#endif /* __DMA_SHDMA_H */
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