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Commit 6365bead authored by Russell King's avatar Russell King
Browse files

DMA: sa11x0: add SA-11x0 DMA driver 



Add support for the SA-11x0 DMA driver, which replaces the private
API version in arch/arm/mach-sa1100/dma.c.

We model this as a set of virtual DMA channels, one for each request
signal, and assign the virtual DMA channel to a physical DMA channel
when there is work to be done.  This allows DMA users to claim their
channels, and hold them while not in use, without affecting the
availability of the physical channels.

Another advantage over this approach, compared to the private version,
is that a channel can be reconfigured on the fly without having to
release and re-request it - which for the IrDA driver, allows us to
use DMA for SIR mode transmit without eating up three physical
channels.  As IrDA is half-duplex, we actually only need one physical
channel, and this architecture allows us to achieve that.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent d65b4e98

drivers/dma/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -252,6 +252,15 @@ config EP93XX_DMA 
	help

	  Enable support for the Cirrus Logic EP93xx M2P/M2M DMA controller.



config DMA_SA11X0

	tristate "SA-11x0 DMA support"

	depends on ARCH_SA1100

	select DMA_ENGINE

	help

	  Support the DMA engine found on Intel StrongARM SA-1100 and

	  SA-1110 SoCs.  This DMA engine can only be used with on-chip

	  devices.



config DMA_ENGINE

	bool

drivers/dma/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -27,3 +27,4 @@ obj-$(CONFIG_PL330_DMA) += pl330.o 
obj-$(CONFIG_PCH_DMA) += pch_dma.o

obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o

obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o

obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o

drivers/dma/sa11x0-dma.c

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+1109 −0

File added.

Preview size limit exceeded, changes collapsed.

include/linux/sa11x0-dma.h

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+24 −0
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/*

 * SA11x0 DMA Engine support

 *

 * Copyright (C) 2012 Russell King

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#ifndef __LINUX_SA11X0_DMA_H

#define __LINUX_SA11X0_DMA_H



struct dma_chan;



#if defined(CONFIG_DMA_SA11X0) || defined(CONFIG_DMA_SA11X0_MODULE)

bool sa11x0_dma_filter_fn(struct dma_chan *, void *);

#else

static inline bool sa11x0_dma_filter_fn(struct dma_chan *c, void *d)

{

	return false;

}

#endif



#endif