Could you please forward me the patch to make it work in polling mode ? I'd like to test it as I've been trying to make intpm work with a SB400 (which should be quite the same as yours) but system hangs when I try to force polling mode (didn't have the specs nor all the differences you just presented). And btw, I didn't find any implementation using interrupt neither but I'm ready to test your updated version.
Thanks, Aurélien ----- Original Message ----- From: "Andriy Gapon" <[email protected]> To: <[email protected]>; <[email protected]> Sent: Tuesday, August 25, 2009 7:49 PM Subject: AMD SB700 SMBus controller driver > > According to SB700 specifications its SMBus controller is very similar to > one in > PIIX4. > The differences that I see so far: > > 1. Interrupt Line/Interrupt Pin PCI configuration registers (0x3c, 0x3d) > do not > specify interrupt number that the controller could use: >> This register specifies which interrupt pin the device issue >> This module does not generate interrupt but contains the >> actual interrupt controller. This register is hardcoded to 0. > > 2. I2CbusConfig register (0xd2) uses bit #1 to indicate whether SMI or > regular > interrupt is used in interrupt mode; PIIX4 uses bit 3. > > I couldn't get our intpm driver to work with this hardware by simply > adding PCI id > and tweaking 0xd2 bits meaning. > > I could get it to work by forcing polling mode. It appears that Linux > driver for > this HW always uses polling mode, and OpenBSD and NetBSD drivers would use > it with > this HW too. > > I am still trying to get interrupt mode to work. > I set 0xd2 to enable regular interrupt generation (it is set to SMI after > boot). > SB700 specifications say at one place that SMB interrupt is connected to > INTIN20 > pin of IO-APIC in APIC mode. I tried setting up IRQ20 in the driver but no > interrupts are generated. And there are no stray interrupts either. > So I am not sure - either this HW doesn't generate normal interrupts at > all, or > they to a different pin, or additional setup is required, or I am doing > something > wrong. > > Anyway, I plan to produce an updated version of intpm driver with > possibility of > forced or auto-detected polling mode and support for PCI id of SB700 SMBus > controller and its peculiarities. > > -- > Andriy Gapon > _______________________________________________ > [email protected] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "[email protected]" > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
