[PATCH] Assign all PCI busses on G3 Blue & White

Pavel Roskin proski at gnu.org
Sun Feb 4 19:16:08 EST 2007

From: Pavel Roskin <proski at gnu.org>

G3 Blue & White is misconfigured by default so that CardBus controllers
in PCI slots don't work.  The PCI bridge is programmed to only allow
access to bus 1 but not higher busses.

The patch forces the PCI busses to be reassigned if a Grackle controller
is found and the machine identifies itself as "PowerMac1,1"

Signed-off-by: Pavel Roskin <proski at gnu.org>
My previous attempt to fix this bug can be found in this thread:
The new patch relies on the existing common PCI code and doesn't poke
bridge registers itself.  It would even do the right thing if a PCI or
CardBus bridge is inserted into the upper slot reserved for video cards
and connected directly to bus 0.

 arch/powerpc/sysdev/grackle.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/sysdev/grackle.c b/arch/powerpc/sysdev/grackle.c
index b6ec793..4205362 100644
--- a/arch/powerpc/sysdev/grackle.c
+++ b/arch/powerpc/sysdev/grackle.c
@@ -56,6 +56,8 @@ static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
 void __init setup_grackle(struct pci_controller *hose)
 	setup_indirect_pci(hose, 0xfec00000, 0xfee00000);
+	if (machine_is_compatible("PowerMac1,1"))
+		pci_assign_all_buses = 1;
 	if (machine_is_compatible("AAPL,PowerBook1998"))
 		grackle_set_loop_snoop(hose, 1);
 #if 0	/* Disabled for now, HW problems ??? */

Pavel Roskin

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