1 /* 2 * Standard Hot Plug Controller Driver 3 * 4 * Copyright (C) 1995,2001 Compaq Computer Corporation 5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 6 * Copyright (C) 2001 IBM Corp. 7 * Copyright (C) 2003-2004 Intel Corporation 8 * 9 * All rights reserved. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or (at 14 * your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 19 * NON INFRINGEMENT. See the GNU General Public License for more 20 * details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> 27 * 28 */ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/types.h> 33 #include <linux/pci.h> 34 #include "../pci.h" 35 #include "shpchp.h" 36 37 int shpchp_configure_device(struct slot *p_slot) 38 { 39 struct pci_dev *dev; 40 struct controller *ctrl = p_slot->ctrl; 41 struct pci_dev *bridge = ctrl->pci_dev; 42 struct pci_bus *parent = bridge->subordinate; 43 int num, ret = 0; 44 45 pci_lock_rescan_remove(); 46 47 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); 48 if (dev) { 49 ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n", 50 pci_name(dev), pci_domain_nr(parent), 51 p_slot->bus, p_slot->device); 52 pci_dev_put(dev); 53 ret = -EINVAL; 54 goto out; 55 } 56 57 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 58 if (num == 0) { 59 ctrl_err(ctrl, "No new device found\n"); 60 ret = -ENODEV; 61 goto out; 62 } 63 64 list_for_each_entry(dev, &parent->devices, bus_list) { 65 if (PCI_SLOT(dev->devfn) != p_slot->device) 66 continue; 67 if (pci_is_bridge(dev)) 68 pci_hp_add_bridge(dev); 69 } 70 71 pci_assign_unassigned_bridge_resources(bridge); 72 pcie_bus_configure_settings(parent); 73 pci_bus_add_devices(parent); 74 75 out: 76 pci_unlock_rescan_remove(); 77 return ret; 78 } 79 80 int shpchp_unconfigure_device(struct slot *p_slot) 81 { 82 int rc = 0; 83 u8 bctl = 0; 84 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 85 struct pci_dev *dev, *temp; 86 struct controller *ctrl = p_slot->ctrl; 87 88 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", 89 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); 90 91 pci_lock_rescan_remove(); 92 93 list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) { 94 if (PCI_SLOT(dev->devfn) != p_slot->device) 95 continue; 96 97 pci_dev_get(dev); 98 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 99 pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl); 100 if (bctl & PCI_BRIDGE_CTL_VGA) { 101 ctrl_err(ctrl, 102 "Cannot remove display device %s\n", 103 pci_name(dev)); 104 pci_dev_put(dev); 105 rc = -EINVAL; 106 break; 107 } 108 } 109 pci_stop_and_remove_bus_device(dev); 110 pci_dev_put(dev); 111 } 112 113 pci_unlock_rescan_remove(); 114 return rc; 115 } 116 117