Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 1 | /* |
| 2 | * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code |
| 3 | * for RPA-compliant PPC64 platform. |
| 4 | * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> |
| 5 | * Copyright (C) 2005 International Business Machines |
| 6 | * |
| 7 | * Updates, 2005, John Rose <johnrose@austin.ibm.com> |
| 8 | * Updates, 2005, Linas Vepstas <linas@austin.ibm.com> |
| 9 | * |
| 10 | * All rights reserved. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or (at |
| 15 | * your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 20 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 21 | * details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/pci.h> |
Paul Gortmaker | 9308794 | 2011-07-29 16:19:31 +1000 | [diff] [blame] | 29 | #include <linux/export.h> |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 30 | #include <asm/pci-bridge.h> |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 31 | #include <asm/ppc-pci.h> |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 32 | #include <asm/firmware.h> |
Olaf Hering | c3b9d9a | 2007-03-22 23:14:07 +0100 | [diff] [blame] | 33 | #include <asm/eeh.h> |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 34 | |
Daniel Axtens | 38ae9ec | 2015-03-31 16:00:50 +1100 | [diff] [blame] | 35 | #include "pseries.h" |
| 36 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 37 | struct pci_controller *init_phb_dynamic(struct device_node *dn) |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 38 | { |
| 39 | struct pci_controller *phb; |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 40 | |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 41 | pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name); |
| 42 | |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 43 | phb = pcibios_alloc_controller(dn); |
| 44 | if (!phb) |
| 45 | return NULL; |
Benjamin Herrenschmidt | 4c9d280 | 2006-11-11 17:25:08 +1100 | [diff] [blame] | 46 | rtas_setup_phb(phb); |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 47 | pci_process_bridge_OF_ranges(phb, dn, 0); |
Daniel Axtens | 38ae9ec | 2015-03-31 16:00:50 +1100 | [diff] [blame] | 48 | phb->controller_ops = pseries_pci_controller_ops; |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 49 | |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 50 | pci_devs_phb_init_dynamic(phb); |
| 51 | |
Gavin Shan | eb740b5 | 2012-02-27 20:04:04 +0000 | [diff] [blame] | 52 | /* Create EEH devices for the PHB */ |
| 53 | eeh_dev_phb_init_dynamic(phb); |
| 54 | |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 55 | if (dn->child) |
Gavin Shan | ff57b45 | 2015-03-17 16:15:06 +1100 | [diff] [blame] | 56 | eeh_add_device_tree_early(PCI_DN(dn)); |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 57 | |
Grant Likely | b5d937d | 2011-02-04 11:24:11 -0700 | [diff] [blame] | 58 | pcibios_scan_phb(phb); |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 59 | pcibios_finish_adding_to_bus(phb->bus); |
John Rose | 92eb460 | 2006-03-14 17:46:45 -0600 | [diff] [blame] | 60 | |
| 61 | return phb; |
| 62 | } |
| 63 | EXPORT_SYMBOL_GPL(init_phb_dynamic); |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 64 | |
| 65 | /* RPA-specific bits for removing PHBs */ |
| 66 | int remove_phb_dynamic(struct pci_controller *phb) |
| 67 | { |
| 68 | struct pci_bus *b = phb->bus; |
| 69 | struct resource *res; |
| 70 | int rc, i; |
| 71 | |
Frans Pop | 8354be9 | 2010-02-06 07:47:20 +0000 | [diff] [blame] | 72 | pr_debug("PCI: Removing PHB %04x:%02x...\n", |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 73 | pci_domain_nr(b), b->number); |
| 74 | |
| 75 | /* We cannot to remove a root bus that has children */ |
| 76 | if (!(list_empty(&b->children) && list_empty(&b->devices))) |
| 77 | return -EBUSY; |
| 78 | |
| 79 | /* We -know- there aren't any child devices anymore at this stage |
| 80 | * and thus, we can safely unmap the IO space as it's not in use |
| 81 | */ |
| 82 | res = &phb->io_resource; |
| 83 | if (res->flags & IORESOURCE_IO) { |
| 84 | rc = pcibios_unmap_io_space(b); |
| 85 | if (rc) { |
| 86 | printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", |
| 87 | __func__, b->name); |
| 88 | return 1; |
| 89 | } |
| 90 | } |
| 91 | |
Tyrel Datwyler | 7340056 | 2014-07-29 13:48:13 -0400 | [diff] [blame] | 92 | /* Remove the PCI bus and unregister the bridge device from sysfs */ |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 93 | phb->bus = NULL; |
| 94 | pci_remove_bus(b); |
Tyrel Datwyler | 7340056 | 2014-07-29 13:48:13 -0400 | [diff] [blame] | 95 | device_unregister(b->bridge); |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 96 | |
| 97 | /* Now release the IO resource */ |
| 98 | if (res->flags & IORESOURCE_IO) |
| 99 | release_resource(res); |
| 100 | |
| 101 | /* Release memory resources */ |
| 102 | for (i = 0; i < 3; ++i) { |
| 103 | res = &phb->mem_resources[i]; |
| 104 | if (!(res->flags & IORESOURCE_MEM)) |
| 105 | continue; |
| 106 | release_resource(res); |
| 107 | } |
| 108 | |
| 109 | /* Free pci_controller data structure */ |
| 110 | pcibios_free_controller(phb); |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | EXPORT_SYMBOL_GPL(remove_phb_dynamic); |