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 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 pci_bus_size_bridges(dev->subordinate); 57 pci_bus_assign_resources(parent); 58 pci_enable_bridges(parent); 59 pci_bus_add_devices(parent); 60 return 0; 61 } 62 63 int pciehp_configure_device(struct slot *p_slot) 64 { 65 struct pci_dev *dev; 66 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 67 int num, fn; 68 69 dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0)); 70 if (dev) { 71 err("Device %s already exists at %x:%x, cannot hot-add\n", 72 pci_name(dev), p_slot->bus, p_slot->device); 73 return -EINVAL; 74 } 75 76 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 77 if (num == 0) { 78 err("No new device found\n"); 79 return -ENODEV; 80 } 81 82 for (fn = 0; fn < 8; fn++) { 83 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn)); 84 if (!dev) 85 continue; 86 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 87 err("Cannot hot-add display device %s\n", 88 pci_name(dev)); 89 continue; 90 } 91 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 92 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 93 pciehp_add_bridge(dev); 94 } 95 /* TBD: program firmware provided _HPP values */ 96 /* program_fw_provided_values(dev); */ 97 } 98 99 pci_bus_assign_resources(parent); 100 pci_bus_add_devices(parent); 101 return 0; 102 } 103 104 int pciehp_unconfigure_device(struct slot *p_slot) 105 { 106 int rc = 0; 107 int j; 108 u8 bctl = 0; 109 110 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, 111 p_slot->device); 112 113 for (j=0; j<8 ; j++) { 114 struct pci_dev* temp = pci_find_slot(p_slot->bus, 115 (p_slot->device << 3) | j); 116 if (!temp) 117 continue; 118 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 119 err("Cannot remove display device %s\n", 120 pci_name(temp)); 121 continue; 122 } 123 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 124 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 125 if (bctl & PCI_BRIDGE_CTL_VGA) { 126 err("Cannot remove display device %s\n", 127 pci_name(temp)); 128 continue; 129 } 130 } 131 pci_remove_bus_device(temp); 132 } 133 /* 134 * Some PCI Express root ports require fixup after hot-plug operation. 135 */ 136 if (pcie_mch_quirk) 137 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev); 138 139 return rc; 140 } 141 142