Re: [Bluez-users] bt3c_cs time out - no firmware loaded?

[Marcel Holtmann <marcel@rvs.uni-bielefeld.de>]

Hi Ben,

> > if you don't see any other solution to work around, this device will be
> > not supported on the PowerPC platform.
> 
> And probably many others...
> 
> direct IO port access is really an x86 thing... 
> 
> Note that if the cardbus bridge actually sits on the main PCI bus and uses
> "legacy" PIO addresses, it is possible to do something, though I hate it ;)
> 
> You can call the sys_pciconfig_iobase syscall to retreive the physical base
> address where the IO ports of a given PCI bus are mapped.
> 
> By passing that the bus number where the cardbus bridge lives on, you can
> then use the resulting value to mmap /dev/mem and actually access those
> IO ports.
> 
> When actually implementing inx/outx in userland, I strongly suggest you do
> what the kernel does in asm/io.h for ld/st_le16, so you get byteswapped
> access for 16 bits, and have proper eieio barriers.
> 
> That syscall should have the following syntax:
> 
> #define IOBASE_IO		2
> 
> syscall(200, IOBASE_IO, bus_number, 0);

I have not a PowerPC platform for testing, so I can't write any code at
the moment. But your proposal looks very ugly and I don't want to go
this way for 2.4. I will wait until the firmware stuff is accepted by
Linus and then try to port the current driver to the new architecture.

Regards

Marcel




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