Hi Zhou Wang, Thanks for unifying arm and arm64 code. On Wed, Jun 3, 2015 at 2:05 PM, Zhou Wang <wangzhou1@xxxxxxxxxxxxx> wrote: > > This patch tries to unify ARM32 and ARM64 PCIe in designware driver. Delete > function dw_pcie_setup, dw_pcie_scan_bus, dw_pcie_map_irq and struct hw_pci, > move related operations to dw_pcie_host_init. Also set pp->root_bus_nr = 0 in > each PCIe host driver which is based on pcie-designware. > > I am not very clear about I/O resource management: Following discussion may help to understand it, specially in the context of designware. http://marc.info/?l=linux-pci&m=138621989417562&w=2 > > if (global_io_offset < SZ_1M && pp->io_size > 0) { > > pci_ioremap_io(global_io_offset, pp->io_base); > > global_io_offset += SZ_64K; > > pci_add_resource_offset(&res, &pp->io, > > global_io_offset - pp->io_bus_addr); > > } > so just move steps in dw_pcie_setup to dw_pcie_host_init. > > I have compiled the driver with multi_v7_defconfig. However, I don't have > ARM32 PCIe related board to do test. It will be appreciated if someone could > help to test it. > > Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx> > Tested-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx> > --- > drivers/pci/host/pci-dra7xx.c | 1 + > drivers/pci/host/pci-exynos.c | 2 +- > drivers/pci/host/pci-imx6.c | 2 +- > drivers/pci/host/pci-keystone.c | 2 +- > drivers/pci/host/pci-layerscape.c | 2 +- > drivers/pci/host/pcie-designware.c | 128 +++++++++++++++---------------------- > drivers/pci/host/pcie-spear13xx.c | 2 +- > 7 files changed, 56 insertions(+), 83 deletions(-) > [...] > diff --git a/drivers/pci/host/pci-layerscape.c b/drivers/pci/host/pci-layerscape.c > index 4a6e62f..5c7a9c4 100644 > --- a/drivers/pci/host/pci-layerscape.c > +++ b/drivers/pci/host/pci-layerscape.c > @@ -101,7 +101,7 @@ static int ls_add_pcie_port(struct ls_pcie *pcie) > pp = &pcie->pp; > pp->dev = pcie->dev; > pp->dbi_base = pcie->dbi; > - pp->root_bus_nr = -1; > + pp->root_bus_nr = 0; similar change for pcie-spear13xx.c should be needed as well. > pp->ops = &ls_pcie_host_ops; > > ret = dw_pcie_host_init(pp); > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c > index 2e9f84f..b3f0ac7 100644 > --- a/drivers/pci/host/pcie-designware.c > +++ b/drivers/pci/host/pcie-designware.c [...] > -#ifdef CONFIG_PCI_MSI > - dw_pcie_msi_chip.dev = pp->dev; > - dw_pci.msi_ctrl = &dw_pcie_msi_chip; > +#ifdef CONFIG_ARM > + /* > + * FIXME: we should really be able to use > + * of_pci_get_host_bridge_resources on arm32 as well, > + * but the conversion needs some more testing > + */ > + if (global_io_offset < SZ_1M && pp->io_size > 0) { > + pci_ioremap_io(global_io_offset, pp->io_base); > + global_io_offset += SZ_64K; > + pci_add_resource_offset(&res, &pp->io, > + global_io_offset - pp->io_bus_addr); > + } > + pci_add_resource_offset(&res, &pp->mem, > + pp->mem.start - pp->mem_bus_addr); > + pci_add_resource(&res, &pp->busn); > +#else > + ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base); > + if (ret) > + return ret; > +#endif > + > + bus = pci_create_root_bus(pp->dev, pp->root_bus_nr, &dw_pcie_ops, > + pp, &res); > + if (!bus) > + return -ENOMEM; > + > +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN > + bus->msi = container_of(&pp->irq_domain, struct msi_controller, domain); > +#else > + bus->msi = &dw_pcie_msi_chip; > #endif > > - dw_pci.nr_controllers = 1; > - dw_pci.private_data = (void **)&pp; > + pci_scan_child_bus(bus); > + if (pp->ops->scan_bus) > + pp->ops->scan_bus(pp); > > - pci_common_init_dev(pp->dev, &dw_pci); > +#ifdef CONFIG_ARM > + /* support old dtbs that incorrectly describe IRQs */ > + pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); > +#endif > + > + pci_assign_unassigned_bus_resources(bus); > + pci_bus_add_devices(bus); As James and Lorenzo has suggested, of_pci_get_host_bridge_resources should work for ARM as well. I would suggest to move that just after cfg resource parsing and then to remove following piece of code. for_each_of_pci_range(&parser, &range) { ... } ret = of_pci_parse_bus_range(np, &pp->busn); Then you can have a loop like list_for_each_entry(entry, &res, node) { struct resource *res_temp = entry->res; if (resource_type(res_temp) == IORESOURCE_IO) { } else if (resource_type(res_temp) == IORESOURCE_MEM) { } } where you can fill, xx_size, xx_bus_addr, xx_mod_base etc. You can also remove global_io_offset variable. ~Pratyush -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
