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// SPDX-License-Identifier: GPL-2.0
/*
* Generic PCI host driver common code
*
* Copyright (C) 2014 ARM Limited
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/pci-ecam.h>
#include <linux/platform_device.h>
static void gen_pci_unmap_cfg(void *ptr)
{
pci_ecam_free((struct pci_config_window *)ptr);
}
static struct pci_config_window *gen_pci_init(struct device *dev,
struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
{
int err;
struct resource cfgres;
struct resource_entry *bus;
struct pci_config_window *cfg;
err = of_address_to_resource(dev->of_node, 0, &cfgres);
if (err) {
dev_err(dev, "missing \"reg\" property\n");
return ERR_PTR(err);
}
bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
if (!bus)
return ERR_PTR(-ENODEV);
cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
if (IS_ERR(cfg))
return cfg;
err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
if (err)
return ERR_PTR(err);
return cfg;
}
int pci_host_common_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pci_host_bridge *bridge;
struct pci_config_window *cfg;
const struct pci_ecam_ops *ops;
ops = of_device_get_match_data(&pdev->dev);
if (!ops)
return -ENODEV;
bridge = devm_pci_alloc_host_bridge(dev, 0);
if (!bridge)
return -ENOMEM;
platform_set_drvdata(pdev, bridge);
of_pci_check_probe_only();
/* Parse and map our Configuration Space windows */
cfg = gen_pci_init(dev, bridge, ops);
if (IS_ERR(cfg))
return PTR_ERR(cfg);
/* Do not reassign resources if probe only */
if (!pci_has_flag(PCI_PROBE_ONLY))
pci_add_flags(PCI_REASSIGN_ALL_BUS);
bridge->sysdata = cfg;
bridge->ops = (struct pci_ops *)&ops->pci_ops;
bridge->msi_domain = true;
return pci_host_probe(bridge);
}
EXPORT_SYMBOL_GPL(pci_host_common_probe);
int pci_host_common_remove(struct platform_device *pdev)
{
struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
pci_lock_rescan_remove();
pci_stop_root_bus(bridge->bus);
pci_remove_root_bus(bridge->bus);
pci_unlock_rescan_remove();
return 0;
}
EXPORT_SYMBOL_GPL(pci_host_common_remove);
MODULE_LICENSE("GPL v2");
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