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89 lines
2.2 KiB
89 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Simple, generic PCI host controller driver targeting firmware-initialised |
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* systems and virtual machines (e.g. the PCI emulation provided by kvmtool). |
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* |
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* Copyright (C) 2014 ARM Limited |
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* |
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* Author: Will Deacon <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/pci-ecam.h> |
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#include <linux/platform_device.h> |
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static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = { |
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.bus_shift = 16, |
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.pci_ops = { |
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.map_bus = pci_ecam_map_bus, |
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.read = pci_generic_config_read, |
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.write = pci_generic_config_write, |
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} |
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}; |
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static bool pci_dw_valid_device(struct pci_bus *bus, unsigned int devfn) |
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{ |
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struct pci_config_window *cfg = bus->sysdata; |
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/* |
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* The Synopsys DesignWare PCIe controller in ECAM mode will not filter |
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* type 0 config TLPs sent to devices 1 and up on its downstream port, |
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* resulting in devices appearing multiple times on bus 0 unless we |
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* filter out those accesses here. |
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*/ |
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if (bus->number == cfg->busr.start && PCI_SLOT(devfn) > 0) |
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return false; |
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return true; |
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} |
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static void __iomem *pci_dw_ecam_map_bus(struct pci_bus *bus, |
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unsigned int devfn, int where) |
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{ |
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if (!pci_dw_valid_device(bus, devfn)) |
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return NULL; |
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return pci_ecam_map_bus(bus, devfn, where); |
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} |
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static const struct pci_ecam_ops pci_dw_ecam_bus_ops = { |
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.pci_ops = { |
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.map_bus = pci_dw_ecam_map_bus, |
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.read = pci_generic_config_read, |
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.write = pci_generic_config_write, |
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} |
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}; |
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static const struct of_device_id gen_pci_of_match[] = { |
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{ .compatible = "pci-host-cam-generic", |
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.data = &gen_pci_cfg_cam_bus_ops }, |
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{ .compatible = "pci-host-ecam-generic", |
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.data = &pci_generic_ecam_ops }, |
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{ .compatible = "marvell,armada8k-pcie-ecam", |
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.data = &pci_dw_ecam_bus_ops }, |
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{ .compatible = "socionext,synquacer-pcie-ecam", |
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.data = &pci_dw_ecam_bus_ops }, |
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{ .compatible = "snps,dw-pcie-ecam", |
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.data = &pci_dw_ecam_bus_ops }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, gen_pci_of_match); |
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static struct platform_driver gen_pci_driver = { |
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.driver = { |
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.name = "pci-host-generic", |
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.of_match_table = gen_pci_of_match, |
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}, |
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.probe = pci_host_common_probe, |
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.remove = pci_host_common_remove, |
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}; |
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module_platform_driver(gen_pci_driver); |
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MODULE_LICENSE("GPL v2");
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