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 38 int pciehp_configure_device(struct slot *p_slot) 39 { 40 struct pci_dev *dev; 41 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 42 int num, fn; 43 44 dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0)); 45 if (dev) { 46 err("Device %s already exists at %x:%x, cannot hot-add\n", 47 pci_name(dev), p_slot->bus, p_slot->device); 48 return -EINVAL; 49 } 50 51 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 52 if (num == 0) { 53 err("No new device found\n"); 54 return -ENODEV; 55 } 56 57 for (fn = 0; fn < 8; fn++) { 58 if (!(dev = pci_find_slot(p_slot->bus, 59 PCI_DEVFN(p_slot->device, fn)))) 60 continue; 61 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 62 err("Cannot hot-add display device %s\n", 63 pci_name(dev)); 64 continue; 65 } 66 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 67 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 68 /* Find an unused bus number for the new bridge */ 69 struct pci_bus *child; 70 unsigned char busnr, start = parent->secondary; 71 unsigned char end = parent->subordinate; 72 for (busnr = start; busnr <= end; busnr++) { 73 if (!pci_find_bus(pci_domain_nr(parent), 74 busnr)) 75 break; 76 } 77 if (busnr >= end) { 78 err("No free bus for hot-added bridge\n"); 79 continue; 80 } 81 child = pci_add_new_bus(parent, dev, busnr); 82 if (!child) { 83 err("Cannot add new bus for %s\n", 84 pci_name(dev)); 85 continue; 86 } 87 child->subordinate = pci_do_scan_bus(child); 88 pci_bus_size_bridges(child); 89 } 90 /* TBD: program firmware provided _HPP values */ 91 /* program_fw_provided_values(dev); */ 92 } 93 94 pci_bus_assign_resources(parent); 95 pci_bus_add_devices(parent); 96 pci_enable_bridges(parent); 97 return 0; 98 } 99 100 int pciehp_unconfigure_device(struct slot *p_slot) 101 { 102 int rc = 0; 103 int j; 104 u8 bctl = 0; 105 106 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, 107 p_slot->device); 108 109 for (j=0; j<8 ; j++) { 110 struct pci_dev* temp = pci_find_slot(p_slot->bus, 111 (p_slot->device << 3) | j); 112 if (!temp) 113 continue; 114 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 115 err("Cannot remove display device %s\n", 116 pci_name(temp)); 117 continue; 118 } 119 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 120 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 121 if (bctl & PCI_BRIDGE_CTL_VGA) { 122 err("Cannot remove display device %s\n", 123 pci_name(temp)); 124 continue; 125 } 126 } 127 pci_remove_bus_device(temp); 128 } 129 /* 130 * Some PCI Express root ports require fixup after hot-plug operation. 131 */ 132 if (pcie_mch_quirk) 133 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev); 134 135 return rc; 136 } 137 138