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| author |   Lucas Stach <l.stach@pengutronix.de> | 2014-07-23 19:52:38 +0200 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2014-09-04 14:58:48 -0600 |
| commit | 4f2ebe00597c44f7dc6f88a052a2981ddcf6a0b6 (patch) | |
| tree | 2b1532fb6581a400bcf6e28a2a275cc169eccb44 | |
| parent | PCI: designware: Add support for v3.65 hardware (diff) | |
| download | linux-dev-4f2ebe00597c44f7dc6f88a052a2981ddcf6a0b6.tar.xz linux-dev-4f2ebe00597c44f7dc6f88a052a2981ddcf6a0b6.zip | |
PCI: designware: Parse bus-range property from devicetree
This allows to explicitly specify the covered bus numbers in the
devicetree, which will come in handy once we see a SoC with more than one
PCIe host controller instance.
Previously the driver relied on the behavior of pci_scan_root_bus() to fill
in a range of 0x00-0xff if no valid range was found. We fall back to the
same range if no valid DT entry was found to keep backwards compatibility,
but now do it explicitly.
[bhelgaas: use %pR in error message to avoid duplication]
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
Acked-by: Mohit Kumar <mohit.kumar@st.com>
| -rw-r--r-- | Documentation/devicetree/bindings/pci/designware-pcie.txt | 3 | ||||
| -rw-r--r-- | drivers/pci/host/pcie-designware.c | 11 | ||||
| -rw-r--r-- | drivers/pci/host/pcie-designware.h | 1 |
3 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt index ed0d9b9fff2b..9f4faa8e8d00 100644 --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt @@ -23,3 +23,6 @@ Required properties: Optional properties: - reset-gpio: gpio pin number of power good signal +- bus-range: PCI bus numbers covered (it is recommended for new devicetrees to + specify this property, to keep backwards compatibility a range of 0x00-0xff + is assumed if not present) diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 76d3d8e1f33b..561fa30862ae 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -500,6 +500,16 @@ int __init dw_pcie_host_init(struct pcie_port *pp) } } + ret = of_pci_parse_bus_range(np, &pp->busn); + if (ret < 0) { + pp->busn.name = np->name; + pp->busn.start = 0; + pp->busn.end = 0xff; + pp->busn.flags = IORESOURCE_BUS; + dev_dbg(pp->dev, "failed to parse bus-range property: %d, using default %pR\n", + ret, &pp->busn); + } + if (!pp->dbi_base) { pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start, resource_size(&pp->cfg)); @@ -794,6 +804,7 @@ static int dw_pcie_setup(int nr, struct pci_sys_data *sys) sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr; pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset); + pci_add_resource(&sys->resources, &pp->busn); return 1; } diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h index 3e84e0ae0851..a476e60993cb 100644 --- a/drivers/pci/host/pcie-designware.h +++ b/drivers/pci/host/pcie-designware.h @@ -48,6 +48,7 @@ struct pcie_port { struct resource cfg; struct resource io; struct resource mem; + struct resource busn; struct pcie_port_info config; int irq; u32 lanes; |