path: root/Documentation/mips/pci
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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/mips/pci
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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diff --git a/Documentation/mips/pci/pci.README b/Documentation/mips/pci/pci.README
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+Pete Popov, ppopov@pacbell.net
+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
+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.

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