Commit ddeccb8d authored by Heiko Stuebner's avatar Heiko Stuebner Committed by Kukjin Kim
Browse files

dmaengine: add driver for Samsung s3c24xx SoCs 



This adds a new driver to support the s3c24xx dma using the dmaengine
and makes the old one in mach-s3c24xx obsolete in the long run.

Conceptually the s3c24xx-dma feels like a distant relative of the pl08x
with numerous virtual channels being mapped to a lot less physical ones.
The driver therefore borrows a lot from the amba-pl08x driver in this
regard. Functionality-wise the driver gains a memcpy ability in addition
to the slave_sg one.

The driver supports both the method for requesting the peripheral used
by SoCs before the S3C2443 and the different method for S3C2443 and later.

On earlier SoCs the hardware channels usable for specific peripherals is
constrainted while on later SoCs all channels can be used for any peripheral.

Tested on a s3c2416-based board, memcpy using the dmatest module and
slave_sg partially using the spi-s3c64xx driver.

Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 0fa93b91

drivers/dma/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -154,6 +154,18 @@ config TEGRA20_APB_DMA 
	  This DMA controller transfers data from memory to peripheral fifo

	  or vice versa. It does not support memory to memory data transfer.



config S3C24XX_DMAC

	tristate "Samsung S3C24XX DMA support"

	depends on ARCH_S3C24XX && !S3C24XX_DMA

	select DMA_ENGINE

	select DMA_VIRTUAL_CHANNELS

	help

	  Support for the Samsung S3C24XX DMA controller driver. The

	  DMA controller is having multiple DMA channels which can be

	  configured for different peripherals like audio, UART, SPI.

	  The DMA controller can transfer data from memory to peripheral,

	  periphal to memory, periphal to periphal and memory to memory.



source "drivers/dma/sh/Kconfig"



config COH901318

drivers/dma/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ obj-$(CONFIG_SIRF_DMA) += sirf-dma.o 
obj-$(CONFIG_TI_EDMA) += edma.o

obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o

obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o

obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o

obj-$(CONFIG_PL330_DMA) += pl330.o

obj-$(CONFIG_PCH_DMA) += pch_dma.o

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

drivers/dma/s3c24xx-dma.c

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+1340 −0

File added.

Preview size limit exceeded, changes collapsed.

include/linux/platform_data/dma-s3c24xx.h

0 → 100644
+43 −0
Original line number Diff line number Diff line 
/*

 * S3C24XX DMA handling

 *

 * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>

 *

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

 * under the terms of the GNU General Public License as published by the Free

 * Software Foundation; either version 2 of the License, or (at your option)

 * any later version.

 */



enum s3c24xx_dma_bus {

	S3C24XX_DMA_APB,

	S3C24XX_DMA_AHB,

};



/**

 * @bus: on which bus does the peripheral reside - AHB or APB.

 * @handshake: is a handshake with the peripheral necessary

 * @chansel: channel selection information, depending on variant; reqsel for

 *	     s3c2443 and later and channel-selection map for earlier SoCs

 *	     see CHANSEL doc in s3c2443-dma.c

 */

struct s3c24xx_dma_channel {

	enum s3c24xx_dma_bus bus;

	bool handshake;

	u16 chansel;

};



/**

 * struct s3c24xx_dma_platdata - platform specific settings

 * @num_phy_channels: number of physical channels

 * @channels: array of virtual channel descriptions

 * @num_channels: number of virtual channels

 */

struct s3c24xx_dma_platdata {

	int num_phy_channels;

	struct s3c24xx_dma_channel *channels;

	int num_channels;

};



struct dma_chan;

bool s3c24xx_dma_filter(struct dma_chan *chan, void *param);

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