intpm: add support for AMD SBxxx SMBus controller

[Andriy Gapon]

on 08/09/2009 20:35 John Baldwin said the following:
> On Sunday 06 September 2009 4:36:26 pm Andriy Gapon wrote:
>> Please review the included patch that adds support from SMBus controller found
>> in AMD SB600/700/710/750 south-bridges (not sure about SB800).
>> As I understand, this controller works only in polling mode, so support for this
>> mode was enabled in the code.
>>
>> There are two places that I was not sure about, so I marked them with XXX.
>> The static variable intsmb_cfg_irq9 would be problematic if there are multiple
>> SMBus controllers in a system.
> 
> I would move this into the softc and set it in the attach() routine by
> duplicating that bit of the switch() statement in attach().

OK, thank you for the idea.

>> Also, PCI_INTR_SMB_IRQ_AMD is probably not the best name. Maybe something like
>> PCI_INTR_SMB_IRQ_OTHER or just PCI_INTR_SMB_IRQ would be better?
> 
> I would maybe just change the driver to print the value in hex instead of
> bogus and not add a #define for '2'.  The PIIX4 datasheet says '2' is a
> reserved value for that field FWIW.

But, OTOH, SB700 datasheet says '2' is a regular interrupt.
Although it is quite unclear from that datasheet what that interrupt might be
and if interrupt-driven configuration is possible at all.


-- 
Andriy Gapon