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.t0 || (hpp.t0->revision > 1)) { 52 warn("Could not get hotplug parameters. Use defaults\n"); 53 hpp.t0 = &hpp.type0_data; 54 hpp.t0->revision = 0; 55 hpp.t0->cache_line_size = 8; 56 hpp.t0->latency_timer = 0x40; 57 hpp.t0->enable_serr = 0; 58 hpp.t0->enable_perr = 0; 59 } 60 61 pci_write_config_byte(dev, 62 PCI_CACHE_LINE_SIZE, hpp.t0->cache_line_size); 63 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.t0->latency_timer); 64 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 65 if (hpp.t0->enable_serr) 66 pci_cmd |= PCI_COMMAND_SERR; 67 else 68 pci_cmd &= ~PCI_COMMAND_SERR; 69 if (hpp.t0->enable_perr) 70 pci_cmd |= PCI_COMMAND_PARITY; 71 else 72 pci_cmd &= ~PCI_COMMAND_PARITY; 73 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 74 75 /* Program bridge control value and child devices */ 76 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 77 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 78 hpp.t0->latency_timer); 79 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 80 if (hpp.t0->enable_serr) 81 pci_bctl |= PCI_BRIDGE_CTL_SERR; 82 else 83 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 84 if (hpp.t0->enable_perr) 85 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 86 else 87 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 88 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 89 if (dev->subordinate) { 90 list_for_each_entry(cdev, &dev->subordinate->devices, 91 bus_list) 92 program_fw_provided_values(cdev); 93 } 94 } 95 } 96 97 int __ref shpchp_configure_device(struct slot *p_slot) 98 { 99 struct pci_dev *dev; 100 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 101 int num, fn; 102 struct controller *ctrl = p_slot->ctrl; 103 104 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); 105 if (dev) { 106 ctrl_err(ctrl, "Device %s already exists " 107 "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev), 108 pci_domain_nr(parent), p_slot->bus, p_slot->device); 109 pci_dev_put(dev); 110 return -EINVAL; 111 } 112 113 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 114 if (num == 0) { 115 ctrl_err(ctrl, "No new device found\n"); 116 return -ENODEV; 117 } 118 119 for (fn = 0; fn < 8; fn++) { 120 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn)); 121 if (!dev) 122 continue; 123 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 124 ctrl_err(ctrl, "Cannot hot-add display device %s\n", 125 pci_name(dev)); 126 pci_dev_put(dev); 127 continue; 128 } 129 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || 130 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { 131 /* Find an unused bus number for the new bridge */ 132 struct pci_bus *child; 133 unsigned char busnr, start = parent->secondary; 134 unsigned char end = parent->subordinate; 135 for (busnr = start; busnr <= end; busnr++) { 136 if (!pci_find_bus(pci_domain_nr(parent), 137 busnr)) 138 break; 139 } 140 if (busnr > end) { 141 ctrl_err(ctrl, 142 "No free bus for hot-added bridge\n"); 143 pci_dev_put(dev); 144 continue; 145 } 146 child = pci_add_new_bus(parent, dev, busnr); 147 if (!child) { 148 ctrl_err(ctrl, "Cannot add new bus for %s\n", 149 pci_name(dev)); 150 pci_dev_put(dev); 151 continue; 152 } 153 child->subordinate = pci_do_scan_bus(child); 154 pci_bus_size_bridges(child); 155 } 156 program_fw_provided_values(dev); 157 pci_dev_put(dev); 158 } 159 160 pci_bus_assign_resources(parent); 161 pci_bus_add_devices(parent); 162 pci_enable_bridges(parent); 163 return 0; 164 } 165 166 int shpchp_unconfigure_device(struct slot *p_slot) 167 { 168 int rc = 0; 169 int j; 170 u8 bctl = 0; 171 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 172 struct controller *ctrl = p_slot->ctrl; 173 174 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", 175 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); 176 177 for (j=0; j<8 ; j++) { 178 struct pci_dev* temp = pci_get_slot(parent, 179 (p_slot->device << 3) | j); 180 if (!temp) 181 continue; 182 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { 183 ctrl_err(ctrl, "Cannot remove display device %s\n", 184 pci_name(temp)); 185 pci_dev_put(temp); 186 continue; 187 } 188 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 189 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); 190 if (bctl & PCI_BRIDGE_CTL_VGA) { 191 ctrl_err(ctrl, 192 "Cannot remove display device %s\n", 193 pci_name(temp)); 194 pci_dev_put(temp); 195 continue; 196 } 197 } 198 pci_remove_bus_device(temp); 199 pci_dev_put(temp); 200 } 201 return rc; 202 } 203 204