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1// SPDX-License-Identifier: GPL-2.02/*3 * Simple, generic PCI host controller driver targeting firmware-initialised4 * systems and virtual machines (e.g. the PCI emulation provided by kvmtool).5 *6 * Copyright (C) 2014 ARM Limited7 *8 * Author: Will Deacon <will.deacon@arm.com>9 */10 11#include <linux/kernel.h>12#include <linux/init.h>13#include <linux/module.h>14#include <linux/pci-ecam.h>15#include <linux/platform_device.h>16 17static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {18 .bus_shift = 16,19 .pci_ops = {20 .map_bus = pci_ecam_map_bus,21 .read = pci_generic_config_read,22 .write = pci_generic_config_write,23 }24};25 26static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn)27{28 struct pci_config_window *cfg = bus->sysdata;29 30 /*31 * The Synopsys DesignWare PCIe controller in ECAM mode will not filter32 * type 0 config TLPs sent to devices 1 and up on its downstream port,33 * resulting in devices appearing multiple times on bus 0 unless we34 * filter out those accesses here.35 */36 if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0)37 return false;38 39 return true;40}41 42static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus,43 unsigned int devfn, int where)44{45 if (!pci_dw_valid_device(bus, devfn))46 return NULL;47 48 return pci_ecam_map_bus(bus, devfn, where);49}50 51static const struct pci_ecam_ops pci_dw_ecam_bus_ops = {52 .pci_ops = {53 .map_bus = pci_dw_ecam_map_bus,54 .read = pci_generic_config_read,55 .write = pci_generic_config_write,56 }57};58 59static const struct of_device_id gen_pci_of_match[] = {60 { .compatible = "pci-host-cam-generic",61 .data = &gen_pci_cfg_cam_bus_ops },62 63 { .compatible = "pci-host-ecam-generic",64 .data = &pci_generic_ecam_ops },65 66 { .compatible = "marvell,armada8k-pcie-ecam",67 .data = &pci_dw_ecam_bus_ops },68 69 { .compatible = "socionext,synquacer-pcie-ecam",70 .data = &pci_dw_ecam_bus_ops },71 72 { .compatible = "snps,dw-pcie-ecam",73 .data = &pci_dw_ecam_bus_ops },74 75 { },76};77MODULE_DEVICE_TABLE(of, gen_pci_of_match);78 79static struct platform_driver gen_pci_driver = {80 .driver = {81 .name = "pci-host-generic",82 .of_match_table = gen_pci_of_match,83 },84 .probe = pci_host_common_probe,85 .remove_new = pci_host_common_remove,86};87module_platform_driver(gen_pci_driver);88 89MODULE_DESCRIPTION("Generic PCI host controller driver");90MODULE_LICENSE("GPL v2");91