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, fn; 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 for (fn = 0; fn < 8; fn++) { 61 dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); 62 if (!dev) 63 continue; 64 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 65 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) 66 pci_hp_add_bridge(dev); 67 pci_dev_put(dev); 68 } 69 70 pci_assign_unassigned_bridge_resources(bridge); 71 72 for (fn = 0; fn < 8; fn++) { 73 dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); 74 if (!dev) 75 continue; 76 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 77 pci_dev_put(dev); 78 continue; 79 } 80 pci_configure_slot(dev); 81 pci_dev_put(dev); 82 } 83 84 pci_bus_add_devices(parent); 85 86 return 0; 87 } 88 89 int pciehp_unconfigure_device(struct slot *p_slot) 90 { 91 int ret, rc = 0; 92 int j; 93 u8 bctl = 0; 94 u8 presence = 0; 95 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; 96 u16 command; 97 struct controller *ctrl = p_slot->ctrl; 98 99 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n", 100 __func__, pci_domain_nr(parent), parent->number); 101 ret = pciehp_get_adapter_status(p_slot, &presence); 102 if (ret) 103 presence = 0; 104 105 for (j = 0; j < 8; j++) { 106 struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j)); 107 if (!temp) 108 continue; 109 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) { 110 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 111 if (bctl & PCI_BRIDGE_CTL_VGA) { 112 ctrl_err(ctrl, 113 "Cannot remove display device %s\n", 114 pci_name(temp)); 115 pci_dev_put(temp); 116 rc = -EINVAL; 117 break; 118 } 119 } 120 pci_stop_and_remove_bus_device(temp); 121 /* 122 * Ensure that no new Requests will be generated from 123 * the device. 124 */ 125 if (presence) { 126 pci_read_config_word(temp, PCI_COMMAND, &command); 127 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR); 128 command |= PCI_COMMAND_INTX_DISABLE; 129 pci_write_config_word(temp, PCI_COMMAND, command); 130 } 131 pci_dev_put(temp); 132 } 133 134 return rc; 135 } 136