v4.19.13 snapshot.
diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
new file mode 100644
index 0000000..d8f1045
--- /dev/null
+++ b/drivers/pci/controller/pci-host-common.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generic PCI host driver common code
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/pci-ecam.h>
+#include <linux/platform_device.h>
+
+static void gen_pci_unmap_cfg(void *ptr)
+{
+ pci_ecam_free((struct pci_config_window *)ptr);
+}
+
+static struct pci_config_window *gen_pci_init(struct device *dev,
+ struct list_head *resources, struct pci_ecam_ops *ops)
+{
+ int err;
+ struct resource cfgres;
+ struct resource *bus_range = NULL;
+ struct pci_config_window *cfg;
+
+ /* Parse our PCI ranges and request their resources */
+ err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
+ if (err)
+ return ERR_PTR(err);
+
+ err = of_address_to_resource(dev->of_node, 0, &cfgres);
+ if (err) {
+ dev_err(dev, "missing \"reg\" property\n");
+ goto err_out;
+ }
+
+ cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
+ if (IS_ERR(cfg)) {
+ err = PTR_ERR(cfg);
+ goto err_out;
+ }
+
+ err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);
+ if (err) {
+ gen_pci_unmap_cfg(cfg);
+ goto err_out;
+ }
+ return cfg;
+
+err_out:
+ pci_free_resource_list(resources);
+ return ERR_PTR(err);
+}
+
+int pci_host_common_probe(struct platform_device *pdev,
+ struct pci_ecam_ops *ops)
+{
+ const char *type;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct pci_host_bridge *bridge;
+ struct pci_config_window *cfg;
+ struct list_head resources;
+ int ret;
+
+ bridge = devm_pci_alloc_host_bridge(dev, 0);
+ if (!bridge)
+ return -ENOMEM;
+
+ type = of_get_property(np, "device_type", NULL);
+ if (!type || strcmp(type, "pci")) {
+ dev_err(dev, "invalid \"device_type\" %s\n", type);
+ return -EINVAL;
+ }
+
+ of_pci_check_probe_only();
+
+ /* Parse and map our Configuration Space windows */
+ cfg = gen_pci_init(dev, &resources, ops);
+ if (IS_ERR(cfg))
+ return PTR_ERR(cfg);
+
+ /* Do not reassign resources if probe only */
+ if (!pci_has_flag(PCI_PROBE_ONLY))
+ pci_add_flags(PCI_REASSIGN_ALL_BUS);
+
+ list_splice_init(&resources, &bridge->windows);
+ bridge->dev.parent = dev;
+ bridge->sysdata = cfg;
+ bridge->busnr = cfg->busr.start;
+ bridge->ops = &ops->pci_ops;
+ bridge->map_irq = of_irq_parse_and_map_pci;
+ bridge->swizzle_irq = pci_common_swizzle;
+
+ ret = pci_host_probe(bridge);
+ if (ret < 0) {
+ pci_free_resource_list(&resources);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, bridge->bus);
+ return 0;
+}
+
+int pci_host_common_remove(struct platform_device *pdev)
+{
+ struct pci_bus *bus = platform_get_drvdata(pdev);
+
+ pci_lock_rescan_remove();
+ pci_stop_root_bus(bus);
+ pci_remove_root_bus(bus);
+ pci_unlock_rescan_remove();
+
+ return 0;
+}