Hi Ramesh,
If you use the ATA mode of the CS4 interface then the controller
doesn't behave like an standard EMIF interface but as an PATA signal
lines, this explains why you can't interact with your chip when using
ATA mode. It is OK to use any EMIF you like to interact with the chip
you are using, the problem lies in that you should wire the IRQ line
to some GPIO with IRQ capabilities that is available on your design.
Wiring it to the EMRWn/INTRQ/HRWn line is wrong.
Hope it helps.
Regards,
Diego Dompe
RidgeRun Engineering
On Nov 18, 2008, at 2:47 AM, Ramesh Chandra wrote:
Hi,
I am in the process of porting ISP1760 driver to davinci (dm664)
based platform. I have a ISP1760 usb chipset on my board. I have
already got the driver on the latest kernel and it is running
properly with out errors. The problem is, ISP1760 irq pin is
connected to the davinci's EMIF interface(EMRWn/INTRQ/HRWn), now, i
need to register the interrupt handler of isp1760 with the irq. But
it seems that the (EMRWn/INTRQ/HRWn) pin functions as INTRQ only in
the ATA mode by configuring the PINMUX registers. My ISP1760 is
connected to EMIF interface CS4.
Right now, i am able to read and write in to the register using
the Asynchronous EMIF interface (normal mode). But as soon as i
change my mode to ATA, the same code which worked on the other mode
is reading the chipid as zero and i am not able to read the data
properly from the address where i wrote on the usb chipset.What may
be the issue? My doubts are,
1) Is it right way to interface a Usb host controller through the
ATA interface on this platform?
2) If the above is possible, how do i hook my usb interrupt handler
to the appropriate irq. There are some sample ide/ata drivers
present in the git kernel, IRQ_IDE is defined as 22 -- for the ata
irq, how to determine this? I am planning to register my usb drivers
interrupt handler with the irq no. 22, will that be ok?
3) Apart from PINMUX configuration to configure pins to ATA mode, is
there any other intializations that is needed to read and write in
to my usb chip?
Any help will be highly appreciated,
Thanks in advance.
With Regards,
Ramesh. C
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
