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This common library will be used as a placeholder for helper functions shared by the host controller drivers. This avoids placing the host controller drivers specific helpers in drivers/pci/*.c, to avoid enlarging the kernel image on platforms that do not use host controller drivers at all (like x86/ACPI platforms). Suggested-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://patch.msgid.link/20250508-pcie-reset-slot-v4-3-7050093e2b50@linaro.org
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Common library for PCI host controller drivers
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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.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/pci-ecam.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 gen_pci_unmap_cfg(void *ptr)
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{
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pci_ecam_free((struct pci_config_window *)ptr);
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}
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static struct pci_config_window *gen_pci_init(struct device *dev,
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struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
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{
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int err;
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struct resource cfgres;
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struct resource_entry *bus;
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struct pci_config_window *cfg;
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err = of_address_to_resource(dev->of_node, 0, &cfgres);
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if (err) {
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dev_err(dev, "missing \"reg\" property\n");
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return ERR_PTR(err);
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}
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bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
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if (!bus)
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return ERR_PTR(-ENODEV);
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cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
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if (IS_ERR(cfg))
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return cfg;
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err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
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if (err)
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return ERR_PTR(err);
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return cfg;
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}
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int pci_host_common_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct pci_host_bridge *bridge;
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struct pci_config_window *cfg;
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const struct pci_ecam_ops *ops;
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ops = of_device_get_match_data(&pdev->dev);
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if (!ops)
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return -ENODEV;
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bridge = devm_pci_alloc_host_bridge(dev, 0);
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if (!bridge)
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return -ENOMEM;
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platform_set_drvdata(pdev, bridge);
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of_pci_check_probe_only();
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/* Parse and map our Configuration Space windows */
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cfg = gen_pci_init(dev, bridge, ops);
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if (IS_ERR(cfg))
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return PTR_ERR(cfg);
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bridge->sysdata = cfg;
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bridge->ops = (struct pci_ops *)&ops->pci_ops;
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bridge->enable_device = ops->enable_device;
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bridge->disable_device = ops->disable_device;
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bridge->msi_domain = true;
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return pci_host_probe(bridge);
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}
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EXPORT_SYMBOL_GPL(pci_host_common_probe);
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void pci_host_common_remove(struct platform_device *pdev)
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{
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struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
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pci_lock_rescan_remove();
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pci_stop_root_bus(bridge->bus);
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pci_remove_root_bus(bridge->bus);
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pci_unlock_rescan_remove();
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}
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EXPORT_SYMBOL_GPL(pci_host_common_remove);
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MODULE_DESCRIPTION("Common library for PCI host controller drivers");
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MODULE_LICENSE("GPL v2");
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