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103 lines
2.5 KiB
103 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code |
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* for RPA-compliant PPC64 platform. |
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* Copyright (C) 2003 Linda Xie <[email protected]> |
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* Copyright (C) 2005 International Business Machines |
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* |
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* Updates, 2005, John Rose <[email protected]> |
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* Updates, 2005, Linas Vepstas <[email protected]> |
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*/ |
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#include <linux/pci.h> |
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#include <linux/export.h> |
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#include <asm/pci-bridge.h> |
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#include <asm/ppc-pci.h> |
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#include <asm/firmware.h> |
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#include <asm/eeh.h> |
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#include "pseries.h" |
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struct pci_controller *init_phb_dynamic(struct device_node *dn) |
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{ |
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struct pci_controller *phb; |
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pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn); |
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phb = pcibios_alloc_controller(dn); |
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if (!phb) |
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return NULL; |
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rtas_setup_phb(phb); |
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pci_process_bridge_OF_ranges(phb, dn, 0); |
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phb->controller_ops = pseries_pci_controller_ops; |
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pci_devs_phb_init_dynamic(phb); |
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/* Create EEH devices for the PHB */ |
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eeh_phb_pe_create(phb); |
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if (dn->child) |
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pseries_eeh_init_edev_recursive(PCI_DN(dn)); |
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pcibios_scan_phb(phb); |
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pcibios_finish_adding_to_bus(phb->bus); |
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return phb; |
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} |
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EXPORT_SYMBOL_GPL(init_phb_dynamic); |
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/* RPA-specific bits for removing PHBs */ |
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int remove_phb_dynamic(struct pci_controller *phb) |
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{ |
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struct pci_bus *b = phb->bus; |
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struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge); |
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struct resource *res; |
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int rc, i; |
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pr_debug("PCI: Removing PHB %04x:%02x...\n", |
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pci_domain_nr(b), b->number); |
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/* We cannot to remove a root bus that has children */ |
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if (!(list_empty(&b->children) && list_empty(&b->devices))) |
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return -EBUSY; |
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/* We -know- there aren't any child devices anymore at this stage |
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* and thus, we can safely unmap the IO space as it's not in use |
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*/ |
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res = &phb->io_resource; |
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if (res->flags & IORESOURCE_IO) { |
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rc = pcibios_unmap_io_space(b); |
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if (rc) { |
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printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", |
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__func__, b->name); |
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return 1; |
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} |
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} |
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/* Remove the PCI bus and unregister the bridge device from sysfs */ |
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phb->bus = NULL; |
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pci_remove_bus(b); |
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host_bridge->bus = NULL; |
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device_unregister(&host_bridge->dev); |
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/* Now release the IO resource */ |
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if (res->flags & IORESOURCE_IO) |
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release_resource(res); |
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/* Release memory resources */ |
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for (i = 0; i < 3; ++i) { |
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res = &phb->mem_resources[i]; |
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if (!(res->flags & IORESOURCE_MEM)) |
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continue; |
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release_resource(res); |
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} |
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/* |
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* The pci_controller data structure is freed by |
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* the pcibios_free_controller_deferred() callback; |
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* see pseries_root_bridge_prepare(). |
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*/ |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(remove_phb_dynamic);
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