From 4f2ebe00597c44f7dc6f88a052a2981ddcf6a0b6 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Wed, 23 Jul 2014 19:52:38 +0200 Subject: [PATCH] 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 Signed-off-by: Bjorn Helgaas Reviewed-by: Pratyush Anand Acked-by: Mohit Kumar --- .../devicetree/bindings/pci/designware-pcie.txt | 3 +++ drivers/pci/host/pcie-designware.c | 11 +++++++++++ drivers/pci/host/pcie-designware.h | 1 + 3 files changed, 15 insertions(+) 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; -- 2.39.2