1 /* 2 * Standard 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 "shpchp.h" 36 37 int __ref shpchp_configure_device(struct slot *p_slot) 38 { 39 struct pci_dev *dev; 40 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 41 int num, fn; 42 struct controller *ctrl = p_slot->ctrl; 43 44 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); 45 if (dev) { 46 ctrl_err(ctrl, "Device %s already exists " 47 "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev), 48 pci_domain_nr(parent), p_slot->bus, p_slot->device); 49 pci_dev_put(dev); 50 return -EINVAL; 51 } 52 53 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 54 if (num == 0) { 55 ctrl_err(ctrl, "No new device found\n"); 56 return -ENODEV; 57 } 58 59 for (fn = 0; fn < 8; fn++) { 60 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn)); 61 if (!dev) 62 continue; 63 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 64 ctrl_err(ctrl, "Cannot hot-add display device %s\n", 65 pci_name(dev)); 66 pci_dev_put(dev); 67 continue; 68 } 69 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 70 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 71 /* Find an unused bus number for the new bridge */ 72 struct pci_bus *child; 73 unsigned char busnr, start = parent->secondary; 74 unsigned char end = parent->subordinate; 75 for (busnr = start; busnr <= end; busnr++) { 76 if (!pci_find_bus(pci_domain_nr(parent), 77 busnr)) 78 break; 79 } 80 if (busnr > end) { 81 ctrl_err(ctrl, 82 "No free bus for hot-added bridge\n"); 83 pci_dev_put(dev); 84 continue; 85 } 86 child = pci_add_new_bus(parent, dev, busnr); 87 if (!child) { 88 ctrl_err(ctrl, "Cannot add new bus for %s\n", 89 pci_name(dev)); 90 pci_dev_put(dev); 91 continue; 92 } 93 child->subordinate = pci_do_scan_bus(child); 94 pci_bus_size_bridges(child); 95 } 96 pci_configure_slot(dev); 97 pci_dev_put(dev); 98 } 99 100 pci_bus_assign_resources(parent); 101 pci_bus_add_devices(parent); 102 pci_enable_bridges(parent); 103 return 0; 104 } 105 106 int shpchp_unconfigure_device(struct slot *p_slot) 107 { 108 int rc = 0; 109 int j; 110 u8 bctl = 0; 111 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 112 struct controller *ctrl = p_slot->ctrl; 113 114 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", 115 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); 116 117 for (j=0; j<8 ; j++) { 118 struct pci_dev* temp = pci_get_slot(parent, 119 (p_slot->device << 3) | j); 120 if (!temp) 121 continue; 122 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 123 ctrl_err(ctrl, "Cannot remove display device %s\n", 124 pci_name(temp)); 125 pci_dev_put(temp); 126 continue; 127 } 128 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 129 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 130 if (bctl & PCI_BRIDGE_CTL_VGA) { 131 ctrl_err(ctrl, 132 "Cannot remove display device %s\n", 133 pci_name(temp)); 134 pci_dev_put(temp); 135 continue; 136 } 137 } 138 pci_remove_bus_device(temp); 139 pci_dev_put(temp); 140 } 141 return rc; 142 } 143 144