212 lines
4.9 KiB
C
212 lines
4.9 KiB
C
/*
|
|
* Code borrowed from powerpc/kernel/pci-common.c
|
|
*
|
|
* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
|
|
* Copyright (C) 2014 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#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>
|
|
|
|
/*
|
|
* Called after each bus is probed, but before its children are examined
|
|
*/
|
|
void pcibios_fixup_bus(struct pci_bus *bus)
|
|
{
|
|
/* nothing to do, expected to be removed in the future */
|
|
}
|
|
|
|
/*
|
|
* We don't have to worry about legacy ISA devices, so nothing to do here
|
|
*/
|
|
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
|
|
resource_size_t size, resource_size_t align)
|
|
{
|
|
return res->start;
|
|
}
|
|
|
|
/*
|
|
* Try to assign the IRQ number when probing a new device
|
|
*/
|
|
int pcibios_alloc_irq(struct pci_dev *dev)
|
|
{
|
|
if (acpi_disabled)
|
|
dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
|
|
#ifdef CONFIG_ACPI
|
|
else
|
|
return acpi_pci_irq_enable(dev);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
ACPI_COMPANION_SET(&bridge->dev, adev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 resource *bus_res = &root->secondary;
|
|
u16 seg = root->segment;
|
|
struct pci_config_window *cfg;
|
|
struct resource cfgres;
|
|
unsigned int bsz;
|
|
|
|
/* Use address from _CBA if present, otherwise lookup MCFG */
|
|
if (!root->mcfg_addr)
|
|
root->mcfg_addr = pci_mcfg_lookup(seg, bus_res);
|
|
|
|
if (!root->mcfg_addr) {
|
|
dev_err(&root->device->dev, "%04x:%pR ECAM region not found\n",
|
|
seg, bus_res);
|
|
return NULL;
|
|
}
|
|
|
|
bsz = 1 << pci_generic_ecam_ops.bus_shift;
|
|
cfgres.start = root->mcfg_addr + bus_res->start * bsz;
|
|
cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
|
|
cfgres.flags = IORESOURCE_MEM;
|
|
cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res,
|
|
&pci_generic_ecam_ops);
|
|
if (IS_ERR(cfg)) {
|
|
dev_err(&root->device->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(ri);
|
|
}
|
|
|
|
static struct acpi_pci_root_ops acpi_pci_root_ops = {
|
|
.release_info = pci_acpi_generic_release_info,
|
|
};
|
|
|
|
/* Interface called from ACPI code to setup PCI host controller */
|
|
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
|
|
{
|
|
int node = acpi_get_node(root->device->handle);
|
|
struct acpi_pci_generic_root_info *ri;
|
|
struct pci_bus *bus, *child;
|
|
|
|
ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node);
|
|
if (!ri)
|
|
return NULL;
|
|
|
|
ri->cfg = pci_acpi_setup_ecam_mapping(root);
|
|
if (!ri->cfg) {
|
|
kfree(ri);
|
|
return NULL;
|
|
}
|
|
|
|
acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
|
|
bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
|
|
ri->cfg);
|
|
if (!bus)
|
|
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;
|
|
}
|
|
|
|
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
|