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->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 64 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 65 /* Find an unused bus number for the new bridge */ 66 struct pci_bus *child; 67 unsigned char busnr, start = parent->secondary; 68 unsigned char end = parent->subordinate; 69 for (busnr = start; busnr <= end; busnr++) { 70 if (!pci_find_bus(pci_domain_nr(parent), 71 busnr)) 72 break; 73 } 74 if (busnr > end) { 75 ctrl_err(ctrl, 76 "No free bus for hot-added bridge\n"); 77 pci_dev_put(dev); 78 continue; 79 } 80 child = pci_add_new_bus(parent, dev, busnr); 81 if (!child) { 82 ctrl_err(ctrl, "Cannot add new bus for %s\n", 83 pci_name(dev)); 84 pci_dev_put(dev); 85 continue; 86 } 87 child->subordinate = pci_do_scan_bus(child); 88 pci_bus_size_bridges(child); 89 } 90 pci_configure_slot(dev); 91 pci_dev_put(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 shpchp_unconfigure_device(struct slot *p_slot) 101 { 102 int rc = 0; 103 int j; 104 u8 bctl = 0; 105 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 106 struct controller *ctrl = p_slot->ctrl; 107 108 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", 109 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); 110 111 for (j = 0; j < 8 ; j++) { 112 struct pci_dev *temp = pci_get_slot(parent, 113 (p_slot->device << 3) | j); 114 if (!temp) 115 continue; 116 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 117 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 118 if (bctl & PCI_BRIDGE_CTL_VGA) { 119 ctrl_err(ctrl, 120 "Cannot remove display device %s\n", 121 pci_name(temp)); 122 pci_dev_put(temp); 123 rc = -EINVAL; 124 break; 125 } 126 } 127 pci_remove_bus_device(temp); 128 pci_dev_put(temp); 129 } 130 return rc; 131 } 132 133