From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> This patch adds ARM64 support to the generic PCI host driver. For MSI support, it adds new device tree binding "msi-parent", which should point to corresponded msi-controller. Cc: Will Deacon <will.deacon@xxxxxxx> Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> --- .../devicetree/bindings/pci/host-generic-pci.txt | 3 + drivers/pci/host/Kconfig | 2 +- drivers/pci/host/pci-host-generic.c | 95 ++++++++++++++++++++-- 3 files changed, 90 insertions(+), 10 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt index f0b0436..327e5b1 100644 --- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt @@ -69,6 +69,9 @@ Practice: Interrupt Mapping' and requires the following properties: - interrupt-map-mask : <see aforementioned specification> +Optinal Properties: + +- msi-parent : Specify the msi-controller phandle. Example: diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index 90f5cca..44bf523 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -50,7 +50,7 @@ config PCI_RCAR_GEN2_PCIE config PCI_HOST_GENERIC bool "Generic PCI host controller" - depends on ARM && OF + depends on (ARM || ARM64) && OF help Say Y here if you want to support a simple generic PCI host controller, such as the one emulated by kvmtool. diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c index 3d2076f..f33c547 100644 --- a/drivers/pci/host/pci-host-generic.c +++ b/drivers/pci/host/pci-host-generic.c @@ -42,14 +42,24 @@ struct gen_pci { struct pci_host_bridge host; struct gen_pci_cfg_windows cfg; struct list_head resources; + struct device_node *msi_parent; }; +#ifdef CONFIG_ARM64 +#define bus_to_gen_pci(b) \ + ((struct gen_pci *)b->sysdata) +#else +#define bus_to_gen_pci(b) \ + ((struct gen_pci *) \ + (((struct pci_sys_data *) \ + (bus->sysdata))->private_data)) +#endif + static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus, unsigned int devfn, int where) { - struct pci_sys_data *sys = bus->sysdata; - struct gen_pci *pci = sys->private_data; + struct gen_pci *pci = bus_to_gen_pci(bus); resource_size_t idx = bus->number - pci->cfg.bus_range.start; return pci->cfg.win[idx] + ((devfn << 8) | where); @@ -64,8 +74,7 @@ static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus, unsigned int devfn, int where) { - struct pci_sys_data *sys = bus->sysdata; - struct gen_pci *pci = sys->private_data; + struct gen_pci *pci = bus_to_gen_pci(bus); resource_size_t idx = bus->number - pci->cfg.bus_range.start; return pci->cfg.win[idx] + ((devfn << 12) | where); @@ -80,8 +89,7 @@ static int gen_pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { void __iomem *addr; - struct pci_sys_data *sys = bus->sysdata; - struct gen_pci *pci = sys->private_data; + struct gen_pci *pci = bus_to_gen_pci(bus); addr = pci->cfg.ops->map_bus(bus, devfn, where); @@ -103,8 +111,7 @@ static int gen_pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { void __iomem *addr; - struct pci_sys_data *sys = bus->sysdata; - struct gen_pci *pci = sys->private_data; + struct gen_pci *pci = bus_to_gen_pci(bus); addr = pci->cfg.ops->map_bus(bus, devfn, where); @@ -144,8 +151,11 @@ static int gen_pci_calc_io_offset(struct device *dev, resource_size_t *offset) { static atomic_t wins = ATOMIC_INIT(0); - int err, idx, max_win; + int idx, max_win; unsigned int window; +#ifndef CONFIG_ARM64 + int err; +#endif if (!PAGE_ALIGNED(range->cpu_addr)) return -EINVAL; @@ -156,9 +166,12 @@ static int gen_pci_calc_io_offset(struct device *dev, return -ENOSPC; window = (idx - 1) * SZ_64K; + +#ifndef CONFIG_ARM64 err = pci_ioremap_io(window, range->cpu_addr); if (err) return err; +#endif of_pci_range_to_resource(range, dev->of_node, res); res->start = window; @@ -310,12 +323,58 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) return 0; } +#ifndef CONFIG_ARM64 static int gen_pci_setup(int nr, struct pci_sys_data *sys) { struct gen_pci *pci = sys->private_data; list_splice_init(&pci->resources, &sys->resources); return 1; } +#endif + +#ifdef CONFIG_ARM64 +struct pci_bus *gen_scan_root_bus(struct device *parent, int bus, + struct pci_ops *ops, void *sysdata, + struct list_head *resources) +{ + struct pci_host_bridge_window *window; + bool found = false; + struct pci_bus *b; + int max; + struct gen_pci *pci = sysdata; + + list_for_each_entry(window, resources, list) + if (window->res->flags & IORESOURCE_BUS) { + found = true; + break; + } + + b = pci_create_root_bus(parent, bus, ops, sysdata, resources); + if (!b) + return NULL; + + /* TODO: + * This is probably should be done in the core pci driver somewhere + */ + if (pci->msi_parent) + b->msi = of_pci_find_msi_chip_by_node(pci->msi_parent); + + if (!found) { + dev_info(&b->dev, + "No busn resource found for root bus, will use [bus %02x-ff]\n", + bus); + pci_bus_insert_busn_res(b, bus, 255); + } + + max = pci_scan_child_bus(b); + + if (!found) + pci_bus_update_busn_res_end(b, max); + + pci_bus_add_devices(b); + return b; +} +#endif static int gen_pci_probe(struct platform_device *pdev) { @@ -326,6 +385,7 @@ static int gen_pci_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); +#ifndef CONFIG_ARM64 struct hw_pci hw = { .nr_controllers = 1, .private_data = (void **)&pci, @@ -333,6 +393,7 @@ static int gen_pci_probe(struct platform_device *pdev) .map_irq = of_irq_parse_and_map_pci, .ops = &gen_pci_ops, }; +#endif if (!pci) return -ENOMEM; @@ -368,8 +429,24 @@ static int gen_pci_probe(struct platform_device *pdev) gen_pci_release_of_pci_ranges(pci); return err; } +#ifdef CONFIG_ARM64 +#ifdef CONFIG_PCI_MSI + pci->msi_parent = of_parse_phandle(np, "msi-parent", 0); + if (!pci->msi_parent) { + dev_err(&pdev->dev, "Failed to allocate msi-parent.\n"); + return -EINVAL; + } +#endif + + if (!gen_scan_root_bus(&pdev->dev, pci->cfg.bus_range.start, + &gen_pci_ops, pci, &pci->resources)) { + dev_err(&pdev->dev, "failed to enable PCIe ports\n"); + return -ENODEV; + } +#else pci_common_init_dev(dev, &hw); +#endif /* CONFIG_ARM64 */ return 0; } -- 1.9.3 -- 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