diff options
| author | Minghuan Lian <Minghuan.Lian@freescale.com> | 2015-10-16 10:19:16 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-11-03 00:38:38 +0300 |
| commit | 7af4ce3571931bdc043c4220402262f817b9b968 (patch) | |
| tree | 8e1a7bd1ffc4c1b10d6c8f472c6015eb1901c3a8 /drivers/pci | |
| parent | 72f71afb86bcdbf9dc2261214bf346fad4e2efb0 (diff) | |
| download | linux-7af4ce3571931bdc043c4220402262f817b9b968.tar.xz | |
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/host/pci-layerscape.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/pci/host/pci-layerscape.c b/drivers/pci/host/pci-layerscape.c index 6dd44a071240..5eabe9238f0e 100644 --- a/drivers/pci/host/pci-layerscape.c +++ b/drivers/pci/host/pci-layerscape.c @@ -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; |