1 /* 2 * PCI Express 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 "pciehp.h" 36 37 int pciehp_configure_device(struct slot *p_slot) 38 { 39 struct pci_dev *dev; 40 struct pci_dev *bridge = p_slot->ctrl->pcie->port; 41 struct pci_bus *parent = bridge->subordinate; 42 int num; 43 struct controller *ctrl = p_slot->ctrl; 44 45 dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); 46 if (dev) { 47 ctrl_err(ctrl, "Device %s already exists " 48 "at %04x:%02x:00, cannot hot-add\n", pci_name(dev), 49 pci_domain_nr(parent), parent->number); 50 pci_dev_put(dev); 51 return -EINVAL; 52 } 53 54 num = pci_scan_slot(parent, PCI_DEVFN(0, 0)); 55 if (num == 0) { 56 ctrl_err(ctrl, "No new device found\n"); 57 return -ENODEV; 58 } 59 60 list_for_each_entry(dev, &parent->devices, bus_list) 61 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 62 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) 63 pci_hp_add_bridge(dev); 64 65 pci_assign_unassigned_bridge_resources(bridge); 66 67 list_for_each_entry(dev, &parent->devices, bus_list) { 68 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) 69 continue; 70 71 pci_configure_slot(dev); 72 } 73 74 pci_bus_add_devices(parent); 75 76 return 0; 77 } 78 79 int pciehp_unconfigure_device(struct slot *p_slot) 80 { 81 int ret, rc = 0; 82 u8 bctl = 0; 83 u8 presence = 0; 84 struct pci_dev *dev, *temp; 85 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; 86 u16 command; 87 struct controller *ctrl = p_slot->ctrl; 88 89 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n", 90 __func__, pci_domain_nr(parent), parent->number); 91 ret = pciehp_get_adapter_status(p_slot, &presence); 92 if (ret) 93 presence = 0; 94 95 list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) { 96 pci_dev_get(dev); 97 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) { 98 pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl); 99 if (bctl & PCI_BRIDGE_CTL_VGA) { 100 ctrl_err(ctrl, 101 "Cannot remove display device %s\n", 102 pci_name(dev)); 103 pci_dev_put(dev); 104 rc = -EINVAL; 105 break; 106 } 107 } 108 pci_stop_and_remove_bus_device(dev); 109 /* 110 * Ensure that no new Requests will be generated from 111 * the device. 112 */ 113 if (presence) { 114 pci_read_config_word(dev, PCI_COMMAND, &command); 115 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR); 116 command |= PCI_COMMAND_INTX_DISABLE; 117 pci_write_config_word(dev, PCI_COMMAND, command); 118 } 119 pci_dev_put(dev); 120 } 121 122 return rc; 123 } 124