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; 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 /* use default values if we can't get them from firmware */ 50 if (get_hp_params_from_firmware(dev, &hpp)) { 51 hpp.cache_line_size = 8; 52 hpp.latency_timer = 0x40; 53 hpp.enable_serr = 0; 54 hpp.enable_perr = 0; 55 } 56 57 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp.cache_line_size); 58 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.latency_timer); 59 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 60 if (hpp.enable_serr) 61 pci_cmd |= PCI_COMMAND_SERR; 62 else 63 pci_cmd &= ~PCI_COMMAND_SERR; 64 if (hpp.enable_perr) 65 pci_cmd |= PCI_COMMAND_PARITY; 66 else 67 pci_cmd &= ~PCI_COMMAND_PARITY; 68 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 69 70 /* Program bridge control value and child devices */ 71 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 72 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 73 hpp.latency_timer); 74 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 75 if (hpp.enable_serr) 76 pci_bctl |= PCI_BRIDGE_CTL_SERR; 77 else 78 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 79 if (hpp.enable_perr) 80 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 81 else 82 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 83 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 84 if (dev->subordinate) { 85 list_for_each_entry(cdev, &dev->subordinate->devices, 86 bus_list) 87 program_fw_provided_values(cdev); 88 } 89 } 90 } 91 92 int shpchp_configure_device(struct slot *p_slot) 93 { 94 struct pci_dev *dev; 95 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 96 int num, fn; 97 98 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); 99 if (dev) { 100 err("Device %s already exists at %x:%x, cannot hot-add\n", 101 pci_name(dev), p_slot->bus, p_slot->device); 102 pci_dev_put(dev); 103 return -EINVAL; 104 } 105 106 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 107 if (num == 0) { 108 err("No new device found\n"); 109 return -ENODEV; 110 } 111 112 for (fn = 0; fn < 8; fn++) { 113 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn)); 114 if (!dev) 115 continue; 116 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 117 err("Cannot hot-add display device %s\n", 118 pci_name(dev)); 119 pci_dev_put(dev); 120 continue; 121 } 122 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 123 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 124 /* Find an unused bus number for the new bridge */ 125 struct pci_bus *child; 126 unsigned char busnr, start = parent->secondary; 127 unsigned char end = parent->subordinate; 128 for (busnr = start; busnr <= end; busnr++) { 129 if (!pci_find_bus(pci_domain_nr(parent), 130 busnr)) 131 break; 132 } 133 if (busnr >= end) { 134 err("No free bus for hot-added bridge\n"); 135 pci_dev_put(dev); 136 continue; 137 } 138 child = pci_add_new_bus(parent, dev, busnr); 139 if (!child) { 140 err("Cannot add new bus for %s\n", 141 pci_name(dev)); 142 pci_dev_put(dev); 143 continue; 144 } 145 child->subordinate = pci_do_scan_bus(child); 146 pci_bus_size_bridges(child); 147 } 148 program_fw_provided_values(dev); 149 pci_dev_put(dev); 150 } 151 152 pci_bus_assign_resources(parent); 153 pci_bus_add_devices(parent); 154 pci_enable_bridges(parent); 155 return 0; 156 } 157 158 int shpchp_unconfigure_device(struct slot *p_slot) 159 { 160 int rc = 0; 161 int j; 162 u8 bctl = 0; 163 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 164 165 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, p_slot->device); 166 167 for (j=0; j<8 ; j++) { 168 struct pci_dev* temp = pci_get_slot(parent, 169 (p_slot->device << 3) | j); 170 if (!temp) 171 continue; 172 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 173 err("Cannot remove display device %s\n", 174 pci_name(temp)); 175 pci_dev_put(temp); 176 continue; 177 } 178 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 179 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 180 if (bctl & PCI_BRIDGE_CTL_VGA) { 181 err("Cannot remove display device %s\n", 182 pci_name(temp)); 183 pci_dev_put(temp); 184 continue; 185 } 186 } 187 pci_remove_bus_device(temp); 188 pci_dev_put(temp); 189 } 190 return rc; 191 } 192 193