On Sat, Jul 25, 2015 at 04:21:23AM +0100, Zhou Wang 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. This patch also try Memory for ports is kzalloc'ed, so there is no need to zero it. I still think that you should explain the root_bus_nr setting to 0 a bit better, why you make the change and why it is safe. [...] > -int dw_pcie_host_init(struct pcie_port *pp) > +int __init dw_pcie_host_init(struct pcie_port *pp) > { > struct device_node *np = pp->dev->of_node; > struct platform_device *pdev = to_platform_device(pp->dev); > - struct of_pci_range range; > - struct of_pci_range_parser parser; > + struct pci_bus *bus; > struct resource *cfg_res; > - u32 val, na, ns; > + LIST_HEAD(res); > + u32 val, ns; > const __be32 *addrp; > int i, index, ret; > + struct resource_entry *win; > > - /* Find the address cell size and the number of cells in order to get > - * the untranslated address. > - */ > - of_property_read_u32(np, "#address-cells", &na); > + /* Find the number of cells in order to get the untranslated address */ > ns = of_n_size_cells(np); > > cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config"); > @@ -392,78 +382,62 @@ int dw_pcie_host_init(struct pcie_port *pp) > dev_err(pp->dev, "missing *config* reg space\n"); > } > > - if (of_pci_range_parser_init(&parser, np)) { > - dev_err(pp->dev, "missing ranges property\n"); > - return -EINVAL; > - } > + ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base); > + if (ret) > + return ret; > > /* Get the I/O and memory ranges from DT */ > - for_each_of_pci_range(&parser, &range) { > - unsigned long restype = range.flags & IORESOURCE_TYPE_BITS; > - > - if (restype == IORESOURCE_IO) { > - of_pci_range_to_resource(&range, np, &pp->io); > - pp->io.name = "I/O"; > - pp->io.start = max_t(resource_size_t, > - PCIBIOS_MIN_IO, > - range.pci_addr + global_io_offset); > - pp->io.end = min_t(resource_size_t, > - IO_SPACE_LIMIT, > - range.pci_addr + range.size > - + global_io_offset - 1); > - pp->io_size = resource_size(&pp->io); > - pp->io_bus_addr = range.pci_addr; > - pp->io_base = range.cpu_addr; > - > - /* Find the untranslated IO space address */ > - pp->io_mod_base = of_read_number(parser.range - > - parser.np + na, ns); > - } > - if (restype == IORESOURCE_MEM) { > - of_pci_range_to_resource(&range, np, &pp->mem); > - pp->mem.name = "MEM"; > - pp->mem_size = resource_size(&pp->mem); > - pp->mem_bus_addr = range.pci_addr; > - > - /* Find the untranslated MEM space address */ > - pp->mem_mod_base = of_read_number(parser.range - > - parser.np + na, ns); > - } > - if (restype == 0) { > - of_pci_range_to_resource(&range, np, &pp->cfg); > - pp->cfg0_size = resource_size(&pp->cfg)/2; > - pp->cfg1_size = resource_size(&pp->cfg)/2; > - pp->cfg0_base = pp->cfg.start; > - pp->cfg1_base = pp->cfg.start + pp->cfg0_size; > + resource_list_for_each_entry(win, &res) { > + switch (resource_type(win->res)) { > + case IORESOURCE_IO: > + pp->io = win->res; > + pp->io->name = "I/O"; > + pp->io_size = resource_size(pp->io); > + pp->io_bus_addr = pp->io->start - win->offset; > + pp->io_mod_base = win->__res.start; > + ret = pci_remap_iospace(pp->io, pp->io_base); > + if (ret) { > + dev_warn(pp->dev, "error %d: failed to map resource %pR\n", > + ret, pp->io); > + continue; > + } > + break; > + case IORESOURCE_MEM: > + pp->mem = win->res; > + pp->mem->name = "MEM"; > + pp->mem_size = resource_size(pp->mem); > + pp->mem_bus_addr = pp->mem->start - win->offset; > + pp->mem_mod_base = win->__res.start; > + break; > + case 0: > + pp->cfg = win->res; > + pp->cfg0_size = resource_size(pp->cfg)/2; > + pp->cfg1_size = resource_size(pp->cfg)/2; > + pp->cfg0_base = pp->cfg->start; > + pp->cfg1_base = pp->cfg->start + pp->cfg0_size; > > /* Find the untranslated configuration space address */ > - pp->cfg0_mod_base = of_read_number(parser.range - > - parser.np + na, ns); > - pp->cfg1_mod_base = pp->cfg0_mod_base + > - pp->cfg0_size; > + pp->cfg0_mod_base = win->__res.start; > + pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size; > + break; > + case IORESOURCE_BUS: > + pp->busn = win->res; > + break; > + default: > + continue; > } > } > > - 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)); > + pp->dbi_base = devm_ioremap(pp->dev, pp->cfg->start, > + resource_size(pp->cfg)); > if (!pp->dbi_base) { > dev_err(pp->dev, "error with ioremap\n"); > return -ENOMEM; > } > } > > - pp->mem_base = pp->mem.start; > + pp->mem_base = pp->mem->start; > > if (!pp->va_cfg0_base) { > pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base, > @@ -524,15 +498,28 @@ int dw_pcie_host_init(struct pcie_port *pp) > val |= PORT_LOGIC_SPEED_CHANGE; > dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val); > > -#ifdef CONFIG_PCI_MSI > - dw_pcie_msi_chip.dev = pp->dev; Is it safe to remove the dev assignment ? > - dw_pci.msi_ctrl = &dw_pcie_msi_chip; > + 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 For the records, this patch conflicts with my MSI series: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/360461.html Conflict resolution is easy but it is worth keeping in mind. Thanks ! Lorenzo > > - 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); > > return 0; > } > @@ -633,7 +620,7 @@ static int dw_pcie_valid_config(struct pcie_port *pp, > static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, > int size, u32 *val) > { > - struct pcie_port *pp = sys_to_pcie(bus->sysdata); > + struct pcie_port *pp = bus->sysdata; > int ret; > > if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) { > @@ -657,7 +644,7 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, > static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn, > int where, int size, u32 val) > { > - struct pcie_port *pp = sys_to_pcie(bus->sysdata); > + struct pcie_port *pp = bus->sysdata; > int ret; > > if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) > @@ -681,62 +668,6 @@ static struct pci_ops dw_pcie_ops = { > .write = dw_pcie_wr_conf, > }; > > -static int dw_pcie_setup(int nr, struct pci_sys_data *sys) > -{ > - struct pcie_port *pp; > - > - pp = sys_to_pcie(sys); > - > - if (global_io_offset < SZ_1M && pp->io_size > 0) { > - sys->io_offset = global_io_offset - pp->io_bus_addr; > - pci_ioremap_io(global_io_offset, pp->io_base); > - global_io_offset += SZ_64K; > - pci_add_resource_offset(&sys->resources, &pp->io, > - sys->io_offset); > - } > - > - sys->mem_offset = pp->mem.start - pp->mem_bus_addr; > - pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset); > - pci_add_resource(&sys->resources, &pp->busn); > - > - return 1; > -} > - > -static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys) > -{ > - struct pci_bus *bus; > - struct pcie_port *pp = sys_to_pcie(sys); > - > - pp->root_bus_nr = sys->busnr; > - bus = pci_scan_root_bus(pp->dev, sys->busnr, > - &dw_pcie_ops, sys, &sys->resources); > - if (!bus) > - return NULL; > - > - if (bus && pp->ops->scan_bus) > - pp->ops->scan_bus(pp); > - > - return bus; > -} > - > -static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) > -{ > - struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata); > - int irq; > - > - irq = of_irq_parse_and_map_pci(dev, slot, pin); > - if (!irq) > - irq = pp->irq; > - > - return irq; > -} > - > -static struct hw_pci dw_pci = { > - .setup = dw_pcie_setup, > - .scan = dw_pcie_scan_bus, > - .map_irq = dw_pcie_map_irq, > -}; > - > void dw_pcie_setup_rc(struct pcie_port *pp) > { > u32 val; > diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h > index d0bbd27..efac57d 100644 > --- a/drivers/pci/host/pcie-designware.h > +++ b/drivers/pci/host/pcie-designware.h > @@ -34,7 +34,7 @@ struct pcie_port { > u64 cfg1_mod_base; > void __iomem *va_cfg1_base; > u32 cfg1_size; > - u64 io_base; > + resource_size_t io_base; > u64 io_mod_base; > phys_addr_t io_bus_addr; > u32 io_size; > @@ -42,10 +42,10 @@ struct pcie_port { > u64 mem_mod_base; > phys_addr_t mem_bus_addr; > u32 mem_size; > - struct resource cfg; > - struct resource io; > - struct resource mem; > - struct resource busn; > + struct resource *cfg; > + struct resource *io; > + struct resource *mem; > + struct resource *busn; > int irq; > u32 lanes; > struct pcie_host_ops *ops; > diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c > index c49fbdc..03eb204 100644 > --- a/drivers/pci/host/pcie-spear13xx.c > +++ b/drivers/pci/host/pcie-spear13xx.c > @@ -286,7 +286,7 @@ static int spear13xx_add_pcie_port(struct pcie_port *pp, > return ret; > } > > - pp->root_bus_nr = -1; > + pp->root_bus_nr = 0; > pp->ops = &spear13xx_pcie_host_ops; > > ret = dw_pcie_host_init(pp); > -- > 1.9.1 > > -- > 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 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html