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path: root/drivers/pci/controller/pci-host-common.c
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Diffstat (limited to 'drivers/pci/controller/pci-host-common.c')
-rw-r--r--drivers/pci/controller/pci-host-common.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
new file mode 100644
index 000000000..6ce34a1de
--- /dev/null
+++ b/drivers/pci/controller/pci-host-common.c
@@ -0,0 +1,100 @@
+// 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/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.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 pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
+{
+ int err;
+ struct resource cfgres;
+ struct resource_entry *bus;
+ struct pci_config_window *cfg;
+
+ err = of_address_to_resource(dev->of_node, 0, &cfgres);
+ if (err) {
+ dev_err(dev, "missing \"reg\" property\n");
+ return ERR_PTR(err);
+ }
+
+ bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
+ if (!bus)
+ return ERR_PTR(-ENODEV);
+
+ cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
+ if (IS_ERR(cfg))
+ return cfg;
+
+ err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
+ if (err)
+ return ERR_PTR(err);
+
+ return cfg;
+}
+
+int pci_host_common_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pci_host_bridge *bridge;
+ struct pci_config_window *cfg;
+ const struct pci_ecam_ops *ops;
+
+ ops = of_device_get_match_data(&pdev->dev);
+ if (!ops)
+ return -ENODEV;
+
+ bridge = devm_pci_alloc_host_bridge(dev, 0);
+ if (!bridge)
+ return -ENOMEM;
+
+ of_pci_check_probe_only();
+
+ /* Parse and map our Configuration Space windows */
+ cfg = gen_pci_init(dev, bridge, 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);
+
+ bridge->sysdata = cfg;
+ bridge->ops = (struct pci_ops *)&ops->pci_ops;
+
+ platform_set_drvdata(pdev, bridge);
+
+ return pci_host_probe(bridge);
+}
+EXPORT_SYMBOL_GPL(pci_host_common_probe);
+
+int pci_host_common_remove(struct platform_device *pdev)
+{
+ struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
+
+ pci_lock_rescan_remove();
+ pci_stop_root_bus(bridge->bus);
+ pci_remove_root_bus(bridge->bus);
+ pci_unlock_rescan_remove();
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pci_host_common_remove);
+
+MODULE_LICENSE("GPL v2");