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PCI: rcar: Fix bridge logic configuration accesses 

The bridge logic at slot 0 only supports reads up to 0x40 and the rest of
the PCI configuration space for this slot is marked as reserved in the
manual.

Trying a read from offset 0x100 is producing an error from the bridge. With
error interrupts enabled, the following is printed:

  pci-rcar-gen2 ee0d0000.pci: error irq: status 00000014

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Ben Dooks 2014-02-18 11:11:11 +09:00 committed by Bjorn Helgaas
parent 80a595d941
commit e64a2a973e
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/host/pci-rcar-gen2.c
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@ -119,6 +119,10 @@ static void __iomem *rcar_pci_cfg_base(struct pci_bus *bus, unsigned int devfn,
if (slot > 2)
return NULL;
/* bridge logic only has registers to 0x40 */
if (slot == 0x0 && where >= 0x40)
return NULL;
val = slot ? RCAR_AHBPCI_WIN1_DEVICE | RCAR_AHBPCI_WIN_CTR_CFG :
RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG;