Messages in this thread | | | Date | Wed, 9 Jun 1999 10:52:42 +0200 | From | Martin Mares <> | Subject | Re: 1st load: PCI IRQ=9 ; 2nd load: PCI IRQ=0 !!! |
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Hello,
> I've just implemented the Cyclades-Z interrupt mode support (the board > currently operates in Linux only in polling mode, although the HW supports > both polling and interrupt modes; once this new patch is applied, it'll > support both modes). Everything works fine for kernels 2.2.x, however in > kernels 2.0.x (namely 2.0.37pre12) I have a rather weird problem. > > The first time the driver is called, it reads all the info from the PCI > config. registers, including the IRQ: > > /* read PCI configuration area */ > pcibios_read_config_byte(cyy_bus, cyy_dev_fn, > PCI_INTERRUPT_LINE, &cy_pci_irq); > pcibios_read_config_dword(cyy_bus, cyy_dev_fn, > PCI_BASE_ADDRESS_0, > (unsigned int *) &cy_pci_addr0); > pcibios_read_config_dword(cyy_bus, cyy_dev_fn, > PCI_BASE_ADDRESS_1, > (unsigned int *) &cy_pci_addr1); > (...) > > Ok, the problem is the following: the first time the driver is called, it > reads the correct IRQ and the driver registers it and works great. If I > unload the module and reload it, the driver reads IRQ0 (zero) !!! > > If I reboot the system, the driver will again see the correct IRQ and it > will work fine, until I unload / reload the module. After that, it won't > be able to allocate the IRQ (because it doesn't see the right one) and, > thus, it won't work. > > The most important point here is: IT WORKS FINE UNDER 2.2.x !!! > > Some more info: > > - After following the module load/unload/reload procedure that causes the > problem, 'lspci -vvv' shows IRQ=0 under 2.0.x, and it shows > IRQ=<right value> under 2.2.x;
It seems someone is rewriting the IRQ register.
Can you send me (or point me to) the exact version of the driver this is happening with?
Have a nice fortnight -- Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/ Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth "It said, "Insert disk #3," but only two will fit!"
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