Hi All, I am working on porting Linux 2.6.16.60 on PowerPC based board with Tsi109 system controller. Our platform support is defined in arch/ppc Here is our hardware interrupt routing Tsi109 PCI BUS (BUS 0) | | V VME controller (BUS 0 IDSEL 16) IRQ 36 PMC Slot (BUS 0 IDSEL 17) IRQ 37 PCI-PCI Bridge (BUS 0 IDSEL 18) No IRQ required | (BUS 1)| |-------> PMC Slot (BUS 1 IDSEL 19) IRQ 38 USB Contr(BUS 1 IDSEL 20) IRQ 39
I faced a problem at map_irq. Due to pci_swizzle, PCI probe is always returning p2p bridge IDSEL for all device on BUS 1. In our case, we routed independent interrupt lines for the devices on BUS 1. I made a quick workaround by assigning IRQ's based on dev->devfn. Is there any standard way of assigning independent interrupts for the devices connected below P2P bridge? I am facing problem with on-board USB controller. Even though /proc/interrupts shows correct assignment. USB is always returning the following message usb 2-1: new low speed USB device using ohci_hcd and address 2 ohci_hcd 0000:01:04.0: Unlink after no-IRQ? Controller is probably using the wrong IRQ If the interrupts are not assigned properly, how the above message pop-up soon after inserting USB device? Here is the proc entry # cat /proc/interrupts CPU0 12: 105 tsi108_pic Level serial 38: 4270 tsi108_PCI_int Level eth0 39: 1 tsi108_PCI_int Level ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd :usb3 Whereas USB PMC on BUS 0 works fine. I request you to provide some pointers on the same. Thanks a lot, Suresh
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