mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
0b104773b4
struct pci_ecam_ops is typically DT match table data which is defined to be const. It's also best practice for ops structs to be const. Ideally, we'd make struct pci_ops const as well, but that becomes pretty invasive, so for now we just cast it where needed. Link: https://lore.kernel.org/r/20200409234923.21598-2-robh@kernel.org Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Andrew Murray <amurray@thegoodpenguin.co.uk> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Len Brown <lenb@kernel.org> Cc: Jonathan Chocron <jonnyc@amazon.com> Cc: Zhou Wang <wangzhou1@hisilicon.com> Cc: Robert Richter <rrichter@marvell.com> Cc: Toan Le <toan@os.amperecomputing.com> Cc: Marc Gonzalez <marc.w.gonzalez@free.fr> Cc: Mans Rullgard <mans@mansr.com> Cc: linux-acpi@vger.kernel.org
221 lines
5.1 KiB
C
221 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Code borrowed from powerpc/kernel/pci-common.c
|
|
*
|
|
* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
|
|
* Copyright (C) 2014 ARM Ltd.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/of_pci.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci-acpi.h>
|
|
#include <linux/pci-ecam.h>
|
|
#include <linux/slab.h>
|
|
|
|
#ifdef CONFIG_ACPI
|
|
/*
|
|
* Try to assign the IRQ number when probing a new device
|
|
*/
|
|
int pcibios_alloc_irq(struct pci_dev *dev)
|
|
{
|
|
if (!acpi_disabled)
|
|
acpi_pci_irq_enable(dev);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* raw_pci_read/write - Platform-specific PCI config space access.
|
|
*/
|
|
int raw_pci_read(unsigned int domain, unsigned int bus,
|
|
unsigned int devfn, int reg, int len, u32 *val)
|
|
{
|
|
struct pci_bus *b = pci_find_bus(domain, bus);
|
|
|
|
if (!b)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
return b->ops->read(b, devfn, reg, len, val);
|
|
}
|
|
|
|
int raw_pci_write(unsigned int domain, unsigned int bus,
|
|
unsigned int devfn, int reg, int len, u32 val)
|
|
{
|
|
struct pci_bus *b = pci_find_bus(domain, bus);
|
|
|
|
if (!b)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
return b->ops->write(b, devfn, reg, len, val);
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
|
|
int pcibus_to_node(struct pci_bus *bus)
|
|
{
|
|
return dev_to_node(&bus->dev);
|
|
}
|
|
EXPORT_SYMBOL(pcibus_to_node);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ACPI
|
|
|
|
struct acpi_pci_generic_root_info {
|
|
struct acpi_pci_root_info common;
|
|
struct pci_config_window *cfg; /* config space mapping */
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
|
|
{
|
|
if (!acpi_disabled) {
|
|
struct pci_config_window *cfg = bridge->bus->sysdata;
|
|
struct acpi_device *adev = to_acpi_device(cfg->parent);
|
|
struct device *bus_dev = &bridge->bus->dev;
|
|
|
|
ACPI_COMPANION_SET(&bridge->dev, adev);
|
|
set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
|
|
{
|
|
struct resource_entry *entry, *tmp;
|
|
int status;
|
|
|
|
status = acpi_pci_probe_root_resources(ci);
|
|
resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
|
|
if (!(entry->res->flags & IORESOURCE_WINDOW))
|
|
resource_list_destroy_entry(entry);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct device *dev = &root->device->dev;
|
|
struct resource *bus_res = &root->secondary;
|
|
u16 seg = root->segment;
|
|
const struct pci_ecam_ops *ecam_ops;
|
|
struct resource cfgres;
|
|
struct acpi_device *adev;
|
|
struct pci_config_window *cfg;
|
|
int ret;
|
|
|
|
ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
|
|
if (ret) {
|
|
dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
|
|
return NULL;
|
|
}
|
|
|
|
adev = acpi_resource_consumer(&cfgres);
|
|
if (adev)
|
|
dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
|
|
dev_name(&adev->dev));
|
|
else
|
|
dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
|
|
&cfgres);
|
|
|
|
cfg = 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;
|
|
}
|
|
|
|
/* release_info: free resources allocated by init_info */
|
|
static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
|
|
{
|
|
struct acpi_pci_generic_root_info *ri;
|
|
|
|
ri = container_of(ci, struct acpi_pci_generic_root_info, common);
|
|
pci_ecam_free(ri->cfg);
|
|
kfree(ci->ops);
|
|
kfree(ri);
|
|
}
|
|
|
|
/* Interface called from ACPI code to setup PCI host controller */
|
|
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
|
|
{
|
|
struct acpi_pci_generic_root_info *ri;
|
|
struct pci_bus *bus, *child;
|
|
struct acpi_pci_root_ops *root_ops;
|
|
struct pci_host_bridge *host;
|
|
|
|
ri = kzalloc(sizeof(*ri), GFP_KERNEL);
|
|
if (!ri)
|
|
return NULL;
|
|
|
|
root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
|
|
if (!root_ops) {
|
|
kfree(ri);
|
|
return NULL;
|
|
}
|
|
|
|
ri->cfg = pci_acpi_setup_ecam_mapping(root);
|
|
if (!ri->cfg) {
|
|
kfree(ri);
|
|
kfree(root_ops);
|
|
return NULL;
|
|
}
|
|
|
|
root_ops->release_info = pci_acpi_generic_release_info;
|
|
root_ops->prepare_resources = pci_acpi_root_prepare_resources;
|
|
root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
|
|
bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
|
|
if (!bus)
|
|
return NULL;
|
|
|
|
/* If we must preserve the resource configuration, claim now */
|
|
host = pci_find_host_bridge(bus);
|
|
if (host->preserve_config)
|
|
pci_bus_claim_resources(bus);
|
|
|
|
/*
|
|
* Assign whatever was left unassigned. If we didn't claim above,
|
|
* this will reassign everything.
|
|
*/
|
|
pci_assign_unassigned_root_bus_resources(bus);
|
|
|
|
list_for_each_entry(child, &bus->children, node)
|
|
pcie_bus_configure_settings(child);
|
|
|
|
return bus;
|
|
}
|
|
|
|
void pcibios_add_bus(struct pci_bus *bus)
|
|
{
|
|
acpi_pci_add_bus(bus);
|
|
}
|
|
|
|
void pcibios_remove_bus(struct pci_bus *bus)
|
|
{
|
|
acpi_pci_remove_bus(bus);
|
|
}
|
|
|
|
#endif
|