| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * Simple, generic PCI host controller driver targeting firmware-initialised |
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| 4 | * systems and virtual machines (e.g. the PCI emulation provided by kvmtool). |
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| 5 | * |
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| 6 | * Copyright (C) 2014 ARM Limited |
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| 7 | * |
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| 8 | * Author: Will Deacon <will.deacon@arm.com> |
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| 9 | */ |
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| 10 | |
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| 11 | #include <linux/kernel.h> |
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| 12 | #include <linux/init.h> |
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| 13 | #include <linux/module.h> |
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| 14 | #include <linux/pci-ecam.h> |
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| 15 | #include <linux/platform_device.h> |
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| 16 | |
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| 17 | #include "pci-host-common.h" |
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| 18 | |
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| 19 | static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = { |
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| 20 | .bus_shift = 16, |
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| 21 | .pci_ops = { |
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| 22 | .map_bus = pci_ecam_map_bus, |
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| 23 | .read = pci_generic_config_read, |
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| 24 | .write = pci_generic_config_write, |
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| 25 | } |
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| 26 | }; |
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| 27 | |
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| 28 | static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn) |
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| 29 | { |
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| 30 | struct pci_config_window *cfg = bus->sysdata; |
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| 31 | |
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| 32 | /* |
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| 33 | * The Synopsys DesignWare PCIe controller in ECAM mode will not filter |
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| 34 | * type 0 config TLPs sent to devices 1 and up on its downstream port, |
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| 35 | * resulting in devices appearing multiple times on bus 0 unless we |
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| 36 | * filter out those accesses here. |
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| 37 | */ |
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| 38 | if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0) |
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| 39 | return false; |
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| 40 | |
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| 41 | return true; |
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| 42 | } |
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| 43 | |
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| 44 | static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus, |
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| 45 | unsigned int devfn, int where) |
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| 46 | { |
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| 47 | if (!pci_dw_valid_device(bus, devfn)) |
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| 48 | return NULL; |
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| 49 | |
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| 50 | return pci_ecam_map_bus(bus, devfn, where); |
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| 51 | } |
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| 52 | |
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| 53 | static const struct pci_ecam_ops pci_dw_ecam_bus_ops = { |
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| 54 | .pci_ops = { |
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| 55 | .map_bus = pci_dw_ecam_map_bus, |
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| 56 | .read = pci_generic_config_read, |
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| 57 | .write = pci_generic_config_write, |
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| 58 | } |
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| 59 | }; |
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| 60 | |
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| 61 | static const struct of_device_id gen_pci_of_match[] = { |
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| 62 | { .compatible = "pci-host-cam-generic" , |
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| 63 | .data = &gen_pci_cfg_cam_bus_ops }, |
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| 64 | |
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| 65 | { .compatible = "pci-host-ecam-generic" , |
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| 66 | .data = &pci_generic_ecam_ops }, |
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| 67 | |
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| 68 | { .compatible = "marvell,armada8k-pcie-ecam" , |
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| 69 | .data = &pci_dw_ecam_bus_ops }, |
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| 70 | |
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| 71 | { .compatible = "socionext,synquacer-pcie-ecam" , |
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| 72 | .data = &pci_dw_ecam_bus_ops }, |
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| 73 | |
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| 74 | { .compatible = "snps,dw-pcie-ecam" , |
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| 75 | .data = &pci_dw_ecam_bus_ops }, |
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| 76 | |
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| 77 | { }, |
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| 78 | }; |
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| 79 | MODULE_DEVICE_TABLE(of, gen_pci_of_match); |
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| 80 | |
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| 81 | static struct platform_driver gen_pci_driver = { |
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| 82 | .driver = { |
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| 83 | .name = "pci-host-generic" , |
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| 84 | .of_match_table = gen_pci_of_match, |
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| 85 | }, |
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| 86 | .probe = pci_host_common_probe, |
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| 87 | .remove = pci_host_common_remove, |
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| 88 | }; |
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| 89 | module_platform_driver(gen_pci_driver); |
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| 90 | |
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| 91 | MODULE_DESCRIPTION("Generic PCI host controller driver" ); |
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| 92 | MODULE_LICENSE("GPL v2" ); |
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| 93 | |
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