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PCI: layerscape: Ignore PCIe controllers in Endpoint mode

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Layerscape PCIe controller supports root complex (RC) and endpoint (EP)
modes, which can be set by RCW.

If not in RC mode, return -ENODEV without claiming the controller.

Signed-off-by: Minghuan Lian <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
This commit is contained in:
Minghuan Lian 2015-10-16 15:19:16 +08:00 • committed by Bjorn Helgaas
commit 7af4ce3571
1 changed files with 13 additions and 0 deletions
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13
drivers/pci/host/pci-layerscape.c
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@ -47,6 +47,16 @@ struct ls_pcie {
#define to_ls_pcie(x) container_of(x, struct ls_pcie, pp)
static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
{
u32 header_type;
header_type = ioread8(pcie->dbi + PCI_HEADER_TYPE);
header_type &= 0x7f;
return header_type == PCI_HEADER_TYPE_BRIDGE;
}
static int ls_pcie_link_up(struct pcie_port *pp)
{
u32 state;
@ -135,6 +145,9 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
return ret;
pcie->index = index[1];
if (!ls_pcie_is_bridge(pcie))
return -ENODEV;
ret = ls_add_pcie_port(pcie);
if (ret < 0)
return ret;