Lines Matching +full:two +full:- +full:channel
8 ``Documentation/crypto/async-tx-api.rst``
11 Below is a guide to device driver writers on how to use the Slave-DMA API of the
19 - Allocate a DMA slave channel
21 - Set slave and controller specific parameters
23 - Get a descriptor for transaction
25 - Submit the transaction
27 - Issue pending requests and wait for callback notification
31 1. Allocate a DMA slave channel
33 Channel allocation is slightly different in the slave DMA context,
34 client drivers typically need a channel from a particular DMA
35 controller only and even in some cases a specific channel is desired.
36 To request a channel dma_request_chan() API is used.
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44 Which will find and return the ``name`` DMA channel associated with the 'dev'
48 A channel allocated via this interface is exclusive to the caller,
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79 DMA-engine are:
81 - slave_sg: DMA a list of scatter gather buffers from/to a peripheral
83 - dma_cyclic: Perform a cyclic DMA operation from/to a peripheral till the
86 - interleaved_dma: This is common to Slave as well as M2M clients. For slave
90 interleaved DMA transfers are also possible if supported by the channel by
93 A non-NULL return of this transfer API represents a "descriptor" for
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123 nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len);
132 submission so it is important that these two operations are closely
158 DMAengine provides two ways for metadata support.
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203 - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
211 - DMA_DEV_TO_MEM:
222 - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
232 - DMA_DEV_TO_MEM:
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276 issue_pending API. If channel is idle then the first transaction in
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290 ------------
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300 This causes all activity for the DMA channel to be stopped, and may
304 Two variants of this function are available.
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325 This pauses activity on the DMA channel without data loss.
329 .. code-block:: c
333 Resume a previously paused DMA channel. It is invalid to resume a
334 channel which is not currently paused.
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343 This can be used to check the status of the channel. Please see
354 a running DMA channel. It is recommended that DMA engine users
355 pause or stop (via dmaengine_terminate_all()) the channel before
360 .. code-block:: c
364 Synchronize the termination of the DMA channel to the current context.
367 the termination of the DMA channel to the current context. The function will
371 If dmaengine_terminate_async() is used to stop the DMA channel this function