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authorShawn Lin <shawn.lin@rock-chips.com>2018-05-31 04:12:37 +0300
committerBjorn Helgaas <bhelgaas@google.com>2018-06-08 15:50:11 +0300
commit6e0832fa432ec99c94caee733c8f5851cf85560b (patch)
treec4326f9e2d8ff1a6cb17e959fc5268c9e577ca94 /drivers/pci/controller/pci-host-generic.c
parent3a3869f1c443383ef8354ffa0e5fb8df65d8b549 (diff)
downloadlinux-6e0832fa432ec99c94caee733c8f5851cf85560b.tar.xz
PCI: Collect all native drivers under drivers/pci/controller/
Native PCI drivers for root complex devices were originally all in drivers/pci/host/. Some of these devices can also be operated in endpoint mode. Drivers for endpoint mode didn't seem to fit in the "host" directory, so we put both the root complex and endpoint drivers in per-device directories, e.g., drivers/pci/dwc/, drivers/pci/cadence/, etc. These per-device directories contain trivial Kconfig and Makefiles and clutter drivers/pci/. Make a new drivers/pci/controllers/ directory and collect all the device-specific drivers there. No functional change intended. Link: https://lkml.kernel.org/r/1520304202-232891-1-git-send-email-shawn.lin@rock-chips.com Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> [bhelgaas: changelog] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/controller/pci-host-generic.c')
-rw-r--r--drivers/pci/controller/pci-host-generic.c100
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);