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kernel at tekno-soft.it
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 Posted: Thu Nov 05, 2015 12:37 pm Post subject: [asterisk-users] DAHDI driver question for custom card |
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Hi All,
Not sure if this is the right mailing list since the dahdi-dev seems not really active, so I'll try here.
I'm developing a new DAHDI driver for a custom board. In this card I've implemented the reading of
the TDM slots by 2 DMA channels, TX and RX. Each DMA channel has its own callback that
decompose the each slot into a per-channel linear buffer useful for calling the related dahdi_transmit()
and dahdi_receive() functions.
The question is, can I call the dahdi_transmit() from the TX DMA callback and the dahdi_receive() from
the RX DMA callback or should use a particular order for them?
Looking at the DAHDI drivers it seems that the sequence is always: dahdi_ec_chunk() -> dahdi_receive()
and then dahdi_transmit().
Thanks in advance,
Roberto Fichera.
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rmeyerriecks at digium...
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| Posted: Thu Nov 05, 2015 2:57 pm Post subject: [asterisk-users] DAHDI driver question for custom card |
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On Thu, Nov 5, 2015 at 11:36 AM, Roberto Fichera <kernel@tekno-soft.it> wrote:
| Quote: | The question is, can I call the dahdi_transmit() from the TX DMA callback and the dahdi_receive() from
the RX DMA callback or should use a particular order for them?
|
I don't think it will be a problem to call them asynchronously.
Depending on your signal, _dahdi_transmit() and _dahdi_recieve() can
potentially do a lot of processing. They're better suited in a bottom
half than in interrupt context.
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Russ Meyerriecks
Digium, Inc. | Linux Kernel Developer
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direct: +1 256-428-6025
Check us out at: www.digium.com & www.asterisk.org
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kernel at tekno-soft.it
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| Posted: Thu Nov 05, 2015 4:26 pm Post subject: [asterisk-users] DAHDI driver question for custom card |
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On 11/05/2015 08:56 PM, Russ Meyerriecks wrote:
| Quote: | On Thu, Nov 5, 2015 at 11:36 AM, Roberto Fichera <kernel@tekno-soft.it> wrote:
| Quote: | The question is, can I call the dahdi_transmit() from the TX DMA callback and the dahdi_receive() from
the RX DMA callback or should use a particular order for them?
|
I don't think it will be a problem to call them asynchronously.
Depending on your signal, _dahdi_transmit() and _dahdi_recieve() can
potentially do a lot of processing. They're better suited in a bottom
half than in interrupt context.
|
Ok! Then I'll just copy the data and schedule the related TX or RX work.
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