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 static void program_fw_provided_values(struct pci_dev *dev) 38 { 39 u16 pci_cmd, pci_bctl; 40 struct pci_dev *cdev; 41 struct hotplug_params hpp = {0x8, 0x40, 0, 0}; /* defaults */ 42 43 /* Program hpp values for this device */ 44 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 45 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 46 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 47 return; 48 49 get_hp_params_from_firmware(dev, &hpp); 50 51 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp.cache_line_size); 52 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.latency_timer); 53 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 54 if (hpp.enable_serr) 55 pci_cmd |= PCI_COMMAND_SERR; 56 else 57 pci_cmd &= ~PCI_COMMAND_SERR; 58 if (hpp.enable_perr) 59 pci_cmd |= PCI_COMMAND_PARITY; 60 else 61 pci_cmd &= ~PCI_COMMAND_PARITY; 62 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 63 64 /* Program bridge control value and child devices */ 65 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 66 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 67 hpp.latency_timer); 68 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 69 if (hpp.enable_serr) 70 pci_bctl |= PCI_BRIDGE_CTL_SERR; 71 else 72 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 73 if (hpp.enable_perr) 74 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 75 else 76 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 77 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 78 if (dev->subordinate) { 79 list_for_each_entry(cdev, &dev->subordinate->devices, 80 bus_list) 81 program_fw_provided_values(cdev); 82 } 83 } 84 } 85 86 int shpchp_configure_device(struct slot *p_slot) 87 { 88 struct pci_dev *dev; 89 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 90 int num, fn; 91 92 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); 93 if (dev) { 94 err("Device %s already exists at %x:%x, cannot hot-add\n", 95 pci_name(dev), p_slot->bus, p_slot->device); 96 pci_dev_put(dev); 97 return -EINVAL; 98 } 99 100 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 101 if (num == 0) { 102 err("No new device found\n"); 103 return -ENODEV; 104 } 105 106 for (fn = 0; fn < 8; fn++) { 107 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn)); 108 if (!dev) 109 continue; 110 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 111 err("Cannot hot-add display device %s\n", 112 pci_name(dev)); 113 pci_dev_put(dev); 114 continue; 115 } 116 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 117 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 118 /* Find an unused bus number for the new bridge */ 119 struct pci_bus *child; 120 unsigned char busnr, start = parent->secondary; 121 unsigned char end = parent->subordinate; 122 for (busnr = start; busnr <= end; busnr++) { 123 if (!pci_find_bus(pci_domain_nr(parent), 124 busnr)) 125 break; 126 } 127 if (busnr >= end) { 128 err("No free bus for hot-added bridge\n"); 129 pci_dev_put(dev); 130 continue; 131 } 132 child = pci_add_new_bus(parent, dev, busnr); 133 if (!child) { 134 err("Cannot add new bus for %s\n", 135 pci_name(dev)); 136 pci_dev_put(dev); 137 continue; 138 } 139 child->subordinate = pci_do_scan_bus(child); 140 pci_bus_size_bridges(child); 141 } 142 program_fw_provided_values(dev); 143 pci_dev_put(dev); 144 } 145 146 pci_bus_assign_resources(parent); 147 pci_bus_add_devices(parent); 148 pci_enable_bridges(parent); 149 return 0; 150 } 151 152 int shpchp_unconfigure_device(struct slot *p_slot) 153 { 154 int rc = 0; 155 int j; 156 u8 bctl = 0; 157 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 158 159 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, p_slot->device); 160 161 for (j=0; j<8 ; j++) { 162 struct pci_dev* temp = pci_get_slot(parent, 163 (p_slot->device << 3) | j); 164 if (!temp) 165 continue; 166 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 167 err("Cannot remove display device %s\n", 168 pci_name(temp)); 169 pci_dev_put(temp); 170 continue; 171 } 172 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 173 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 174 if (bctl & PCI_BRIDGE_CTL_VGA) { 175 err("Cannot remove display device %s\n", 176 pci_name(temp)); 177 pci_dev_put(temp); 178 continue; 179 } 180 } 181 pci_remove_bus_device(temp); 182 pci_dev_put(temp); 183 } 184 return rc; 185 } 186 187