1 files changed, 100 insertions, 0 deletions

diff --git a/drivers/pci/controller/pci-host-generic.c b/drivers/pci/controller/pci-host-generic.c
new file mode 100644
index 000000000000..dea3ec7592a2
--- /dev/null
+++ b/drivers/pci/controller/pci-host-generic.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Simple, generic PCI host controller driver targetting firmware-initialised
+ * systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/pci-ecam.h>
+#include <linux/platform_device.h>
+
+static struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {
+        .bus_shift      = 16,
+        .pci_ops        = {
+                .map_bus        = pci_ecam_map_bus,
+                .read           = pci_generic_config_read,
+                .write          = pci_generic_config_write,
+        }
+};
+
+static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn)
+{
+        struct pci_config_window *cfg = bus->sysdata;
+
+        /*
+         * The Synopsys DesignWare PCIe controller in ECAM mode will not filter
+         * type 0 config TLPs sent to devices 1 and up on its downstream port,
+         * resulting in devices appearing multiple times on bus 0 unless we
+         * filter out those accesses here.
+         */
+        if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0)
+                return false;
+
+        return true;
+}
+
+static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus,
+                                         unsigned int devfn, int where)
+{
+        if (!pci_dw_valid_device(bus, devfn))
+                return NULL;
+
+        return pci_ecam_map_bus(bus, devfn, where);
+}
+
+static struct pci_ecam_ops pci_dw_ecam_bus_ops = {
+        .bus_shift      = 20,
+        .pci_ops        = {
+                .map_bus        = pci_dw_ecam_map_bus,
+                .read           = pci_generic_config_read,
+                .write          = pci_generic_config_write,
+        }
+};
+
+static const struct of_device_id gen_pci_of_match[] = {
+        { .compatible = "pci-host-cam-generic",
+          .data = &gen_pci_cfg_cam_bus_ops },
+
+        { .compatible = "pci-host-ecam-generic",
+          .data = &pci_generic_ecam_ops },
+
+        { .compatible = "marvell,armada8k-pcie-ecam",
+          .data = &pci_dw_ecam_bus_ops },
+
+        { .compatible = "socionext,synquacer-pcie-ecam",
+          .data = &pci_dw_ecam_bus_ops },
+
+        { .compatible = "snps,dw-pcie-ecam",
+          .data = &pci_dw_ecam_bus_ops },
+
+        { },
+};
+
+static int gen_pci_probe(struct platform_device *pdev)
+{
+        const struct of_device_id *of_id;
+        struct pci_ecam_ops *ops;
+
+        of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);
+        ops = (struct pci_ecam_ops *)of_id->data;
+
+        return pci_host_common_probe(pdev, ops);
+}
+
+static struct platform_driver gen_pci_driver = {
+        .driver = {
+                .name = "pci-host-generic",
+                .of_match_table = gen_pci_of_match,
+                .suppress_bind_attrs = true,
+        },
+        .probe = gen_pci_probe,
+        .remove = pci_host_common_remove,
+};
+builtin_platform_driver(gen_pci_driver);