PCI: layerscape: Ignore PCIe controllers in Endpoint mode
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 <Minghuan.Lian@freescale.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/host/pci-layerscape.c b/drivers/pci/host/pci-layerscape.c
index 6dd44a0..5eabe92 100644
--- a/drivers/pci/host/pci-layerscape.c
+++ b/drivers/pci/host/pci-layerscape.c
@@ -47,6 +47,16 @@
#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 @@
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;