Hi,
I am developing a WDM driver for a PCI device. This device is a memory
mapped device(buffer in device is completely memory mapped i.e. not a FIFO) and it does not have his own DMA.
I guess, I have to use system DMA for data transfer. After data
transfer, I think ,I should expect an interrupt from the DMA controller.
My device has a lot of other interrupts that comes to my driver for
other reasons. How do I distinguish DMA interrupt from other
interrupts(i.e. shall I get the information that, DMA controller has
generated the interrupt looking at some system register?) ?
Finally, my device is a streaming device.Is DMA operation recommended for
this device?( I have to wait for an indefinite amount of time for
DPC to be processed).
Regards,
Champak
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No, you may not ever use the legacy ISA system dma controller for anything
other than legacy ISA system dma.
To transfer data to/from your PCI device you use
(READ|WRITE)REGISTER_BUFFER(ULONG|USHORT|UCHAR) functions provided by the
HAL.
-----Original Message-----
From: girish_gurunathan [mailto:xxxxx@indiatimes.com]
Sent: Friday, January 11, 2002 9:14 AM
To: NT Developers Interest List
Subject: [ntdev] System DMA
Hi,
I am developing a WDM driver for a PCI device. This device is a memory
mapped device(buffer in device is completely memory mapped i.e. not a FIFO)
and it does not have his own DMA.
I guess, I have to use system DMA for data transfer. After data
transfer, I think ,I should expect an interrupt from the DMA controller.
My device has a lot of other interrupts that comes to my driver for
other reasons. How do I distinguish DMA interrupt from other
interrupts(i.e. shall I get the information that, DMA controller has
generated the interrupt looking at some system register?) ?
Finally, my device is a streaming device.Is DMA operation recommended for
this device?( I have to wait for an indefinite amount of time for
DPC to be processed).
Regards,
Champak
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>I am developing a WDM driver for a PCI device. This device is a memory
mapped device(buffer in device is completely memory mapped i.e. not a FIFO) and it does
not have his own DMA.
Then use PIO - WRITE_REGISTER_xxx to the device memory, executed by CPU.
If the memory is PCI prefetchable memory (like video framebuffer) - you can use it by pointer dereferencing.
I guess, I have to use system DMA for data transfer. After data
No. System DMA is ISA only. No ways of running it on PCI.
Max
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