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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
#include <asm/pci.h>
#include <asm/numa.h>
#include <asm/loongson.h>
struct pci_root_info {
struct acpi_pci_root_info common;
struct pci_config_window *cfg;
};
void pcibios_add_bus(struct pci_bus *bus)
{
acpi_pci_add_bus(bus);
}
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct acpi_device *adev = NULL;
struct device *bus_dev = &bridge->bus->dev;
struct pci_config_window *cfg = bridge->bus->sysdata;
if (!acpi_disabled)
adev = to_acpi_device(cfg->parent);
ACPI_COMPANION_SET(&bridge->dev, adev);
set_dev_node(bus_dev, pa_to_nid(cfg->res.start));
return 0;
}
int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
{
struct pci_config_window *cfg = bus->sysdata;
struct acpi_device *adev = to_acpi_device(cfg->parent);
struct acpi_pci_root *root = acpi_driver_data(adev);
return root->segment;
}
static void acpi_release_root_info(struct acpi_pci_root_info *ci)
{
struct pci_root_info *info;
info = container_of(ci, struct pci_root_info, common);
pci_ecam_free(info->cfg);
kfree(ci->ops);
kfree(info);
}
static int acpi_prepare_root_resources(struct acpi_pci_root_info *ci)
{
int status;
struct resource_entry *entry, *tmp;
struct acpi_device *device = ci->bridge;
status = acpi_pci_probe_root_resources(ci);
if (status > 0) {
resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
if (entry->res->flags & IORESOURCE_MEM) {
entry->offset = ci->root->mcfg_addr & GENMASK_ULL(63, 40);
entry->res->start |= entry->offset;
entry->res->end |= entry->offset;
}
}
return status;
}
resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
dev_dbg(&device->dev,
"host bridge window %pR (ignored)\n", entry->res);
resource_list_destroy_entry(entry);
}
return 0;
}
/*
* Create a PCI config space window
* - reserve mem region
* - alloc struct pci_config_window with space for all mappings
* - ioremap the config space
*/
static struct pci_config_window *arch_pci_ecam_create(struct device *dev,
struct resource *cfgres, struct resource *busr, const struct pci_ecam_ops *ops)
{
int bsz, bus_range, err;
struct resource *conflict;
struct pci_config_window *cfg;
if (busr->start > busr->end)
return ERR_PTR(-EINVAL);
cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return ERR_PTR(-ENOMEM);
cfg->parent = dev;
cfg->ops = ops;
cfg->busr.start = busr->start;
cfg->busr.end = busr->end;
cfg->busr.flags = IORESOURCE_BUS;
bus_range = resource_size(cfgres) >> ops->bus_shift;
bsz = 1 << ops->bus_shift;
cfg->res.start = cfgres->start;
cfg->res.end = cfgres->end;
cfg->res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
cfg->res.name = "PCI ECAM";
conflict = request_resource_conflict(&iomem_resource, &cfg->res);
if (conflict) {
err = -EBUSY;
dev_err(dev, "can't claim ECAM area %pR: address conflict with %s %pR\n",
&cfg->res, conflict->name, conflict);
goto err_exit;
}
cfg->win = pci_remap_cfgspace(cfgres->start, bus_range * bsz);
if (!cfg->win)
goto err_exit_iomap;
if (ops->init) {
err = ops->init(cfg);
if (err)
goto err_exit;
}
dev_info(dev, "ECAM at %pR for %pR\n", &cfg->res, &cfg->busr);
return cfg;
err_exit_iomap:
err = -ENOMEM;
dev_err(dev, "ECAM ioremap failed\n");
err_exit:
pci_ecam_free(cfg);
return ERR_PTR(err);
}
/*
* Lookup the bus range for the domain in MCFG, and set up config space
* mapping.
*/
static struct pci_config_window *
pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
{
int ret, bus_shift;
u16 seg = root->segment;
struct device *dev = &root->device->dev;
struct resource cfgres;
struct resource *bus_res = &root->secondary;
struct pci_config_window *cfg;
const struct pci_ecam_ops *ecam_ops;
ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
if (ret < 0) {
dev_err(dev, "%04x:%pR ECAM region not found, use default value\n", seg, bus_res);
ecam_ops = &loongson_pci_ecam_ops;
root->mcfg_addr = mcfg_addr_init(0);
}
bus_shift = ecam_ops->bus_shift ? : 20;
if (bus_shift == 20)
cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
else {
cfgres.start = root->mcfg_addr + (bus_res->start << bus_shift);
cfgres.end = cfgres.start + (resource_size(bus_res) << bus_shift) - 1;
cfgres.end |= BIT(28) + (((PCI_CFG_SPACE_EXP_SIZE - 1) & 0xf00) << 16);
cfgres.flags = IORESOURCE_MEM;
cfg = arch_pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
}
if (IS_ERR(cfg)) {
dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res, PTR_ERR(cfg));
return NULL;
}
return cfg;
}
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
{
struct pci_bus *bus;
struct pci_root_info *info;
struct acpi_pci_root_ops *root_ops;
int domain = root->segment;
int busnum = root->secondary.start;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
pr_warn("pci_bus %04x:%02x: ignored (out of memory)\n", domain, busnum);
return NULL;
}
root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
if (!root_ops) {
kfree(info);
return NULL;
}
info->cfg = pci_acpi_setup_ecam_mapping(root);
if (!info->cfg) {
kfree(info);
kfree(root_ops);
return NULL;
}
root_ops->release_info = acpi_release_root_info;
root_ops->prepare_resources = acpi_prepare_root_resources;
root_ops->pci_ops = (struct pci_ops *)&info->cfg->ops->pci_ops;
bus = pci_find_bus(domain, busnum);
if (bus) {
memcpy(bus->sysdata, info->cfg, sizeof(struct pci_config_window));
kfree(info);
} else {
struct pci_bus *child;
bus = acpi_pci_root_create(root, root_ops,
&info->common, info->cfg);
if (!bus) {
kfree(info);
kfree(root_ops);
return NULL;
}
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
list_for_each_entry(child, &bus->children, node)
pcie_bus_configure_settings(child);
}
return bus;
}
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