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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/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 list_head *resources, struct pci_ecam_ops *ops)
{
int err;
struct resource cfgres;
struct resource *bus_range = NULL;
struct pci_config_window *cfg;
/* Parse our PCI ranges and request their resources */
err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
if (err)
return ERR_PTR(err);
err = of_address_to_resource(dev->of_node, 0, &cfgres);
if (err) {
dev_err(dev, "missing \"reg\" property\n");
goto err_out;
}
cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);
if (IS_ERR(cfg)) {
err = PTR_ERR(cfg);
goto err_out;
}
err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);
if (err) {
gen_pci_unmap_cfg(cfg);
goto err_out;
}
return cfg;
err_out:
pci_free_resource_list(resources);
return ERR_PTR(err);
}
int pci_host_common_probe(struct platform_device *pdev,
struct pci_ecam_ops *ops)
{
const char *type;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct pci_host_bridge *bridge;
struct pci_config_window *cfg;
struct list_head resources;
int ret;
bridge = devm_pci_alloc_host_bridge(dev, 0);
if (!bridge)
return -ENOMEM;
type = of_get_property(np, "device_type", NULL);
if (!type || strcmp(type, "pci")) {
dev_err(dev, "invalid \"device_type\" %s\n", type);
return -EINVAL;
}
of_pci_check_probe_only();
/* Parse and map our Configuration Space windows */
cfg = gen_pci_init(dev, &resources, 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);
list_splice_init(&resources, &bridge->windows);
bridge->dev.parent = dev;
bridge->sysdata = cfg;
bridge->busnr = cfg->busr.start;
bridge->ops = &ops->pci_ops;
bridge->map_irq = of_irq_parse_and_map_pci;
bridge->swizzle_irq = pci_common_swizzle;
ret = pci_host_probe(bridge);
if (ret < 0) {
pci_free_resource_list(&resources);
return ret;
}
return 0;
}
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