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 static int __ref pciehp_add_bridge(struct pci_dev *dev) 38 { 39 struct pci_bus *parent = dev->bus; 40 int pass, busnr, start = parent->secondary; 41 int end = parent->subordinate; 42 43 for (busnr = start; busnr <= end; busnr++) { 44 if (!pci_find_bus(pci_domain_nr(parent), busnr)) 45 break; 46 } 47 if (busnr-- > end) { 48 err("No bus number available for hot-added bridge %s\n", 49 pci_name(dev)); 50 return -1; 51 } 52 for (pass = 0; pass < 2; pass++) 53 busnr = pci_scan_bridge(parent, dev, busnr, pass); 54 if (!dev->subordinate) 55 return -1; 56 57 return 0; 58 } 59 60 int pciehp_configure_device(struct slot *p_slot) 61 { 62 struct pci_dev *dev; 63 struct pci_dev *bridge = p_slot->ctrl->pcie->port; 64 struct pci_bus *parent = bridge->subordinate; 65 int num, fn; 66 struct controller *ctrl = p_slot->ctrl; 67 68 dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); 69 if (dev) { 70 ctrl_err(ctrl, "Device %s already exists " 71 "at %04x:%02x:00, cannot hot-add\n", pci_name(dev), 72 pci_domain_nr(parent), parent->number); 73 pci_dev_put(dev); 74 return -EINVAL; 75 } 76 77 num = pci_scan_slot(parent, PCI_DEVFN(0, 0)); 78 if (num == 0) { 79 ctrl_err(ctrl, "No new device found\n"); 80 return -ENODEV; 81 } 82 83 for (fn = 0; fn < 8; fn++) { 84 dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); 85 if (!dev) 86 continue; 87 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 88 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 89 pciehp_add_bridge(dev); 90 } 91 pci_dev_put(dev); 92 } 93 94 pci_assign_unassigned_bridge_resources(bridge); 95 96 for (fn = 0; fn < 8; fn++) { 97 dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); 98 if (!dev) 99 continue; 100 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 101 pci_dev_put(dev); 102 continue; 103 } 104 pci_configure_slot(dev); 105 pci_dev_put(dev); 106 } 107 108 pci_bus_add_devices(parent); 109 110 return 0; 111 } 112 113 int pciehp_unconfigure_device(struct slot *p_slot) 114 { 115 int ret, rc = 0; 116 int j; 117 u8 bctl = 0; 118 u8 presence = 0; 119 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; 120 u16 command; 121 struct controller *ctrl = p_slot->ctrl; 122 123 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n", 124 __func__, pci_domain_nr(parent), parent->number); 125 ret = pciehp_get_adapter_status(p_slot, &presence); 126 if (ret) 127 presence = 0; 128 129 for (j = 0; j < 8; j++) { 130 struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j)); 131 if (!temp) 132 continue; 133 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) { 134 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 135 if (bctl & PCI_BRIDGE_CTL_VGA) { 136 ctrl_err(ctrl, 137 "Cannot remove display device %s\n", 138 pci_name(temp)); 139 pci_dev_put(temp); 140 rc = -EINVAL; 141 break; 142 } 143 } 144 pci_remove_bus_device(temp); 145 /* 146 * Ensure that no new Requests will be generated from 147 * the device. 148 */ 149 if (presence) { 150 pci_read_config_word(temp, PCI_COMMAND, &command); 151 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR); 152 command |= PCI_COMMAND_INTX_DISABLE; 153 pci_write_config_word(temp, PCI_COMMAND, command); 154 } 155 pci_dev_put(temp); 156 } 157 158 return rc; 159 } 160