From 76f254149171a93e676139b53fcc83043d55a047 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 25 Nov 2016 11:57:12 +0100 Subject: [PATCH] PCI: tegra: Use new pci_register_host_bridge() interface Tegra is one of the remaining platforms that still use the traditional pci_common_init_dev() interface for probing PCI host bridges. This demonstrates how to convert it to the pci_register_host interface I just added in a previous patch. This leads to a more linear probe sequence that can handle errors better because we avoid callbacks into the driver, and it makes the driver architecture independent. Signed-off-by: Arnd Bergmann Signed-off-by: Thierry Reding Signed-off-by: Bjorn Helgaas --- drivers/pci/host/pci-tegra.c | 105 ++++++++++++++++++----------------- 1 file changed, 54 insertions(+), 51 deletions(-) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 8dfccf733241..d5206fa53353 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -322,11 +322,6 @@ struct tegra_pcie_bus { unsigned int nr; }; -static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys) -{ - return sys->private_data; -} - static inline void afi_writel(struct tegra_pcie *pcie, u32 value, unsigned long offset) { @@ -430,7 +425,8 @@ free: static int tegra_pcie_add_bus(struct pci_bus *bus) { - struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata); + struct pci_host_bridge *host = pci_find_host_bridge(bus); + struct tegra_pcie *pcie = pci_host_bridge_priv(host); struct tegra_pcie_bus *b; b = tegra_pcie_bus_alloc(pcie, bus->number); @@ -444,7 +440,8 @@ static int tegra_pcie_add_bus(struct pci_bus *bus) static void tegra_pcie_remove_bus(struct pci_bus *child) { - struct tegra_pcie *pcie = sys_to_pcie(child->sysdata); + struct pci_host_bridge *host = pci_find_host_bridge(child); + struct tegra_pcie *pcie = pci_host_bridge_priv(host); struct tegra_pcie_bus *bus, *tmp; list_for_each_entry_safe(bus, tmp, &pcie->buses, list) { @@ -461,7 +458,8 @@ static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, int where) { - struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata); + struct pci_host_bridge *host = pci_find_host_bridge(bus); + struct tegra_pcie *pcie = pci_host_bridge_priv(host); struct device *dev = pcie->dev; void __iomem *addr = NULL; @@ -610,39 +608,31 @@ static void tegra_pcie_relax_enable(struct pci_dev *dev) } DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); -static int tegra_pcie_setup(int nr, struct pci_sys_data *sys) +static int tegra_pcie_request_resources(struct tegra_pcie *pcie) { - struct tegra_pcie *pcie = sys_to_pcie(sys); + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); + struct list_head *windows = &host->windows; struct device *dev = pcie->dev; int err; - sys->mem_offset = pcie->offset.mem; - sys->io_offset = pcie->offset.io; + pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io); + pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem); + pci_add_resource_offset(windows, &pcie->prefetch, pcie->offset.mem); + pci_add_resource(windows, &pcie->busn); - err = devm_request_resource(dev, &iomem_resource, &pcie->io); + err = devm_request_pci_bus_resources(dev, windows); if (err < 0) return err; - err = pci_remap_iospace(&pcie->pio, pcie->io.start); - if (!err) - pci_add_resource_offset(&sys->resources, &pcie->pio, - sys->io_offset); - - pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset); - pci_add_resource_offset(&sys->resources, &pcie->prefetch, - sys->mem_offset); - pci_add_resource(&sys->resources, &pcie->busn); - - err = devm_request_pci_bus_resources(dev, &sys->resources); - if (err < 0) - return err; + pci_remap_iospace(&pcie->pio, pcie->io.start); - return 1; + return 0; } static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin) { - struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata); + struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus); + struct tegra_pcie *pcie = pci_host_bridge_priv(host); int irq; tegra_cpuidle_pcie_irqs_in_use(); @@ -1499,10 +1489,11 @@ static const struct irq_domain_ops msi_domain_ops = { static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) { - struct device *dev = pcie->dev; - struct platform_device *pdev = to_platform_device(dev); + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); + struct platform_device *pdev = to_platform_device(pcie->dev); const struct tegra_pcie_soc *soc = pcie->soc; struct tegra_msi *msi = &pcie->msi; + struct device *dev = pcie->dev; unsigned long base; int err; u32 reg; @@ -1559,6 +1550,8 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) reg |= AFI_INTR_MASK_MSI_MASK; afi_writel(pcie, reg, AFI_INTR_MASK); + host->msi = &msi->chip; + return 0; err: @@ -2021,11 +2014,10 @@ retry: return false; } -static int tegra_pcie_enable(struct tegra_pcie *pcie) +static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; struct tegra_pcie_port *port, *tmp; - struct hw_pci hw; list_for_each_entry_safe(port, tmp, &pcie->ports, list) { dev_info(dev, "probing port %u, using %u lanes\n", @@ -2041,21 +2033,6 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie) tegra_pcie_port_disable(port); tegra_pcie_port_free(port); } - - memset(&hw, 0, sizeof(hw)); - -#ifdef CONFIG_PCI_MSI - hw.msi_ctrl = &pcie->msi.chip; -#endif - - hw.nr_controllers = 1; - hw.private_data = (void **)&pcie; - hw.setup = tegra_pcie_setup; - hw.map_irq = tegra_pcie_map_irq; - hw.ops = &tegra_pcie_ops; - - pci_common_init_dev(dev, &hw); - return 0; } static const struct tegra_pcie_soc tegra20_pcie = { @@ -2217,13 +2194,17 @@ remove: static int tegra_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct pci_host_bridge *host; struct tegra_pcie *pcie; + struct pci_bus *child; int err; - pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); - if (!pcie) + host = pci_alloc_host_bridge(sizeof(*pcie)); + if (!host) return -ENOMEM; + pcie = pci_host_bridge_priv(host); + pcie->soc = of_device_get_match_data(dev); INIT_LIST_HEAD(&pcie->buses); INIT_LIST_HEAD(&pcie->ports); @@ -2243,6 +2224,10 @@ static int tegra_pcie_probe(struct platform_device *pdev) if (err) goto put_resources; + err = tegra_pcie_request_resources(pcie); + if (err) + goto put_resources; + /* setup the AFI address translations */ tegra_pcie_setup_translations(pcie); @@ -2254,12 +2239,30 @@ static int tegra_pcie_probe(struct platform_device *pdev) } } - err = tegra_pcie_enable(pcie); + tegra_pcie_enable_ports(pcie); + + pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS); + host->busnr = pcie->busn.start; + host->dev.parent = &pdev->dev; + host->ops = &tegra_pcie_ops; + + err = pci_register_host_bridge(host); if (err < 0) { - dev_err(dev, "failed to enable PCIe ports: %d\n", err); + dev_err(dev, "failed to register host: %d\n", err); goto disable_msi; } + pci_scan_child_bus(host->bus); + + pci_fixup_irqs(pci_common_swizzle, tegra_pcie_map_irq); + pci_bus_size_bridges(host->bus); + pci_bus_assign_resources(host->bus); + + list_for_each_entry(child, &host->bus->children, node) + pcie_bus_configure_settings(child); + + pci_bus_add_devices(host->bus); + if (IS_ENABLED(CONFIG_DEBUG_FS)) { err = tegra_pcie_debugfs_init(pcie); if (err < 0) -- 2.39.5