user/sven/linux.git/drivers/dma/dmaengine.c, branch v3.3.5

DMAEngine: Define interleaved transfer request api

2011-11-18T06:46:24Z

Define a new api that could be used for doing fancy data transfers like interleaved to contiguous copy and vice-versa. Traditional SG_list based transfers tend to be very inefficient in such cases as where the interleave and chunk are only a few bytes, which call for a very condensed api to convey pattern of the transfer. This api supports all 4 variants of scatter-gather and contiguous transfer. Of course, neither can this api help transfers that don't lend to DMA by nature, i.e, scattered tiny read/writes with no periodic pattern. Also since now we support SLAVE channels that might not provide device_prep_slave_sg callback but device_prep_interleaved_dma, remove the BUG_ON check. Signed-off-by: Jassi Brar Acked-by: Barry Song [renamed dmaxfer_template to dma_interleaved_template did fixup after the enum dma_transfer_merge] Signed-off-by: Vinod Koul

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx

2011-08-05T02:43:43Z

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: dmaengine: use DEFINE_IDR for static initialization ioat: fix xor_idx_to_desc Avoid section type conflict in dma/ioat/dma_v3.c ioat: Adding PCI IDs for IOAT devices on SandyBridge platforms

dmaengine: use DEFINE_IDR for static initialization

2011-08-04T05:25:39Z

We could use DEFINE_IDR for statically allocated idr that allow us to save a few lines of code. And also remove unneeded mutex_init() for dma_list_mutex, as dma_list_mutex is initialized automatically by DEFINE_MUTEX(). Signed-off-by: Axel Lin Signed-off-by: Dan Williams

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2011-08-01T23:46:37Z

* 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma: (37 commits) Improve slave/cyclic DMA engine documentation dmaengine: pl08x: handle the rest of enums in pl08x_width DMA: PL08x: cleanup selection of burst size DMA: PL08x: avoid recalculating cctl at each prepare DMA: PL08x: cleanup selection of buswidth DMA: PL08x: constify plchan->cd and plat->slave_channels DMA: PL08x: separately store source/destination cctl DMA: PL08x: separately store source/destination slave address DMA: PL08x: clean up LLI debugging DMA: PL08x: select LLI bus only once per LLI setup DMA: PL08x: remove unused constants ARM: mxs-dma: reset after disable channel dma: intel_mid_dma: remove redundant pci_set_drvdata calls dma: mxs-dma: fix unterminated platform_device_id table dmaengine: pl330: make platform data optional dmaengine: imx-sdma: return proper error if kzalloc fails pch_dma: Fix CTL register access issue dmaengine: mxs-dma: skip request_irq for NO_IRQ dmaengine/coh901318: fix slave submission semantics dmaengine/ste_dma40: allow memory buswidth/burst to be configured ... Fix trivial whitespace conflict in drivers/dma/mv_xor.c

dmaengine: failure to get a specific DMA channel is not critical

2011-06-24T10:43:16Z

There exist systems with multiple DMA controllers with different capabilities. For example, on some sh-mobile / rmobile systems there are DMA controllers, whose channels can be configured to be used with SD- and MMC-host controllers, serial ports etc. Besides there are also DMA controllers, that can only be used for one special function, e.g., for USB. In such cases the DMA client filter function can just choose to specify to the DMA driver, which channel it needs. Then the .device_alloc_chan_resources() method of the DMA driver will check, whether it can provide that dunction. If not, it will fail and the loop in __dma_request_channel() will continue to the next DMA device, until it finds a suitable one. This works fine with just one minor glitch: the kernel logs error messages like dmaengine: failed to get : (-) after each such non-critical failure. This patch lowers priority of this message to the debug level. Reported-by: Kuninori Morimoto Signed-off-by: Guennadi Liakhovetski Tested-by: Kuninori Morimoto Tested-by: Magnus Damm Signed-off-by: Vinod Koul

net: remove mm.h inclusion from netdevice.h

2011-06-22T02:17:20Z

Remove linux/mm.h inclusion from netdevice.h -- it's unused (I've checked manually). To prevent mm.h inclusion via other channels also extract "enum dma_data_direction" definition into separate header. This tiny piece is what gluing netdevice.h with mm.h via "netdevice.h => dmaengine.h => dma-mapping.h => scatterlist.h => mm.h". Removal of mm.h from scatterlist.h was tried and was found not feasible on most archs, so the link was cutoff earlier. Hope people are OK with tiny include file. Note, that mm_types.h is still dragged in, but it is a separate story. Signed-off-by: Alexey Dobriyan Signed-off-by: David S. Miller

async_tx: make async_tx channel switching opt-in

2010-10-08T00:08:32Z

The majority of drivers in drivers/dma/ will never establish cross channel operation chains and do not need the extra overhead in struct dma_async_tx_descriptor. Make channel switching opt-in by default. Cc: Anatolij Gustschin Cc: Ira Snyder Cc: Linus Walleij Cc: Saeed Bishara Signed-off-by: Dan Williams

Merge branches 'dma40', 'pl08x', 'fsldma', 'imx' and 'intel-mid' into dmaengine

2010-10-07T22:19:01Z

dma: add support for scatterlist to scatterlist copy

2010-10-07T21:41:40Z

This adds support for scatterlist to scatterlist DMA transfers. A similar interface is exposed by the fsldma driver (through the DMA_SLAVE API) and by the ste_dma40 driver (through an exported function). This patch paves the way for making this type of copy operation a part of the generic DMAEngine API. Futher patches will add support in individual drivers. Signed-off-by: Ira W. Snyder Signed-off-by: Dan Williams

dmaengine: add possibility for cyclic transfers

2010-10-05T22:49:26Z

Cyclic transfers are useful for audio where a single buffer divided in periods has to be transfered endlessly until stopped. After being prepared the transfer is started using the dma_async_descriptor->tx_submit function. dma_async_descriptor->callback is called after each period. The transfer is stopped using the DMA_TERMINATE_ALL callback. While being used for cyclic transfers the channel cannot be used for other transfer types. Signed-off-by: Sascha Hauer Cc: Haavard Skinnemoen Signed-off-by: Dan Williams