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Diffstat (limited to 'Documentation/mips/pci/pci.README')
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diff --git a/Documentation/mips/pci/pci.README b/Documentation/mips/pci/pci.README new file mode 100644 index 000000000000..8697ee41372d --- /dev/null +++ b/Documentation/mips/pci/pci.README @@ -0,0 +1,54 @@ + +Pete Popov, ppopov@pacbell.net +07/11/2001 + +This README briefly explains how to use the pci and pci_auto +code in arch/mips/kernel. The code was ported from PowerPC and +modified slightly. It has been tested pretty well on PPC on some +rather complex systems with multiple bridges and devices behind +each bridge. However, at the time this README was written, the +mips port was tested only on boards with a single pci bus and +no P2P bridges. It's very possible that on boards with P2P +bridges some modifications have to be made. The code will +evolve, no doubt, but currently every single mips board +is doing its own pcibios thing and it has become a big +mess. This generic pci code is meant to clean up the mips +pci mess and make it easier to add pci support to new boards. + +inside the define for your board in arch/mips/config.in. +For example, the Galileo EV96100 board looks like this: + +if [ "$CONFIG_MIPS_EV96100" = "y" ]; then + define_bool CONFIG_PCI y + define_bool CONFIG_MIPS_GT96100 y + define_bool CONFIG_NEW_PCI y + define_bool CONFIG_SWAP_IO_SPACE y +fi + + +Next, if you want to use the arch/mips/kernel/pci code, which has the +pcibios_init() function, add + +define_bool CONFIG_NEW_PCI y + +inside the define for your board. Again, the EV96100 example above +show NEW_PCI turned on. + + +Now you need to add your files to hook in your pci configuration +cycles. Usually you'll need only a couple of files named something +like pci_fixups.c and pci_ops.c. You can copy the templates +provided and fill in the code. + +The file pci_ops.c should contain the pci configuration cycles routines. +It also has the mips_pci_channels[] array which contains the descriptors +of each pci controller. + +The file pci_fixups.c contains a few routines to do interrupt fixups, +resources fixups, and, if needed, pci bios fixups. + +Usually you'll put your pci_fixups.c file in your board specific directory, +since the functions in that file are board specific. The functions in +pci_ops.c, on the other hand, are usually pci controller specific so that +file could be shared among a few different boards using the same +pci controller. |