106 строки
2.9 KiB
C
106 строки
2.9 KiB
C
/*
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* Simple, generic PCI host controller driver targetting 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (C) 2014 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/platform_device.h>
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#include "pci-host-common.h"
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static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
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unsigned int devfn,
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int where)
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{
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struct gen_pci *pci = bus->sysdata;
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resource_size_t idx = bus->number - pci->cfg.bus_range->start;
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return pci->cfg.win[idx] + ((devfn << 8) | where);
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}
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static struct gen_pci_cfg_bus_ops gen_pci_cfg_cam_bus_ops = {
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.bus_shift = 16,
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.ops = {
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.map_bus = gen_pci_map_cfg_bus_cam,
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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 void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
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unsigned int devfn,
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int where)
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{
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struct gen_pci *pci = bus->sysdata;
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resource_size_t idx = bus->number - pci->cfg.bus_range->start;
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return pci->cfg.win[idx] + ((devfn << 12) | where);
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}
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static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = {
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.bus_shift = 20,
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.ops = {
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.map_bus = gen_pci_map_cfg_bus_ecam,
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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 = &gen_pci_cfg_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 int gen_pci_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct of_device_id *of_id;
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struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
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if (!pci)
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return -ENOMEM;
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of_id = of_match_node(gen_pci_of_match, dev->of_node);
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pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;
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return pci_host_common_probe(pdev, pci);
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}
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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 = gen_pci_probe,
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};
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module_platform_driver(gen_pci_driver);
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MODULE_DESCRIPTION("Generic PCI host driver");
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MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
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MODULE_LICENSE("GPL v2");
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