mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
148 lines
4.1 KiB
148 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c" |
|
* |
|
* Copyright (C) 2003 Linda Xie <[email protected]> |
|
* Copyright (C) 2005 International Business Machines |
|
* |
|
* Updates, 2005, John Rose <[email protected]> |
|
* Updates, 2005, Linas Vepstas <[email protected]> |
|
* Updates, 2013, Gavin Shan <[email protected]> |
|
*/ |
|
|
|
#include <linux/pci.h> |
|
#include <linux/export.h> |
|
#include <asm/pci-bridge.h> |
|
#include <asm/ppc-pci.h> |
|
#include <asm/firmware.h> |
|
#include <asm/eeh.h> |
|
|
|
static struct pci_bus *find_bus_among_children(struct pci_bus *bus, |
|
struct device_node *dn) |
|
{ |
|
struct pci_bus *child = NULL; |
|
struct pci_bus *tmp; |
|
|
|
if (pci_bus_to_OF_node(bus) == dn) |
|
return bus; |
|
|
|
list_for_each_entry(tmp, &bus->children, node) { |
|
child = find_bus_among_children(tmp, dn); |
|
if (child) |
|
break; |
|
} |
|
|
|
return child; |
|
} |
|
|
|
struct pci_bus *pci_find_bus_by_node(struct device_node *dn) |
|
{ |
|
struct pci_dn *pdn = PCI_DN(dn); |
|
|
|
if (!pdn || !pdn->phb || !pdn->phb->bus) |
|
return NULL; |
|
|
|
return find_bus_among_children(pdn->phb->bus, dn); |
|
} |
|
EXPORT_SYMBOL_GPL(pci_find_bus_by_node); |
|
|
|
/** |
|
* pcibios_release_device - release PCI device |
|
* @dev: PCI device |
|
* |
|
* The function is called before releasing the indicated PCI device. |
|
*/ |
|
void pcibios_release_device(struct pci_dev *dev) |
|
{ |
|
struct pci_controller *phb = pci_bus_to_host(dev->bus); |
|
struct pci_dn *pdn = pci_get_pdn(dev); |
|
|
|
if (phb->controller_ops.release_device) |
|
phb->controller_ops.release_device(dev); |
|
|
|
/* free()ing the pci_dn has been deferred to us, do it now */ |
|
if (pdn && (pdn->flags & PCI_DN_FLAG_DEAD)) { |
|
pci_dbg(dev, "freeing dead pdn\n"); |
|
kfree(pdn); |
|
} |
|
} |
|
|
|
/** |
|
* pci_hp_remove_devices - remove all devices under this bus |
|
* @bus: the indicated PCI bus |
|
* |
|
* Remove all of the PCI devices under this bus both from the |
|
* linux pci device tree, and from the powerpc EEH address cache. |
|
*/ |
|
void pci_hp_remove_devices(struct pci_bus *bus) |
|
{ |
|
struct pci_dev *dev, *tmp; |
|
struct pci_bus *child_bus; |
|
|
|
/* First go down child busses */ |
|
list_for_each_entry(child_bus, &bus->children, node) |
|
pci_hp_remove_devices(child_bus); |
|
|
|
pr_debug("PCI: Removing devices on bus %04x:%02x\n", |
|
pci_domain_nr(bus), bus->number); |
|
list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { |
|
pr_debug(" Removing %s...\n", pci_name(dev)); |
|
pci_stop_and_remove_bus_device(dev); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(pci_hp_remove_devices); |
|
|
|
/** |
|
* pci_hp_add_devices - adds new pci devices to bus |
|
* @bus: the indicated PCI bus |
|
* |
|
* This routine will find and fixup new pci devices under |
|
* the indicated bus. This routine presumes that there |
|
* might already be some devices under this bridge, so |
|
* it carefully tries to add only new devices. (And that |
|
* is how this routine differs from other, similar pcibios |
|
* routines.) |
|
*/ |
|
void pci_hp_add_devices(struct pci_bus *bus) |
|
{ |
|
int slotno, mode, max; |
|
struct pci_dev *dev; |
|
struct pci_controller *phb; |
|
struct device_node *dn = pci_bus_to_OF_node(bus); |
|
|
|
phb = pci_bus_to_host(bus); |
|
|
|
mode = PCI_PROBE_NORMAL; |
|
if (phb->controller_ops.probe_mode) |
|
mode = phb->controller_ops.probe_mode(bus); |
|
|
|
if (mode == PCI_PROBE_DEVTREE) { |
|
/* use ofdt-based probe */ |
|
of_rescan_bus(dn, bus); |
|
} else if (mode == PCI_PROBE_NORMAL && |
|
dn->child && PCI_DN(dn->child)) { |
|
/* |
|
* Use legacy probe. In the partial hotplug case, we |
|
* probably have grandchildren devices unplugged. So |
|
* we don't check the return value from pci_scan_slot() in |
|
* order for fully rescan all the way down to pick them up. |
|
* They can have been removed during partial hotplug. |
|
*/ |
|
slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); |
|
pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); |
|
max = bus->busn_res.start; |
|
/* |
|
* Scan bridges that are already configured. We don't touch |
|
* them unless they are misconfigured (which will be done in |
|
* the second scan below). |
|
*/ |
|
for_each_pci_bridge(dev, bus) |
|
max = pci_scan_bridge(bus, dev, max, 0); |
|
|
|
/* Scan bridges that need to be reconfigured */ |
|
for_each_pci_bridge(dev, bus) |
|
max = pci_scan_bridge(bus, dev, max, 1); |
|
} |
|
pcibios_finish_adding_to_bus(bus); |
|
} |
|
EXPORT_SYMBOL_GPL(pci_hp_add_devices);
|
|
|