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
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