drivers/pci/hotplug/pciehp_pci.c

   1 /*
   2  * PCI Express 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 "pciehp.h"
  36
  37 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
  38 {
  39         u16 pci_cmd, pci_bctl;
  40
  41         if (hpp->revision > 1) {
  42                 printk(KERN_WARNING "%s: Rev.%d type0 record not supported\n",
  43                        __func__, hpp->revision);
  44                 return;
  45         }
  46
  47         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
  48         pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
  49         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
  50         if (hpp->enable_serr)
  51                 pci_cmd |= PCI_COMMAND_SERR;
  52         else
  53                 pci_cmd &= ~PCI_COMMAND_SERR;
  54         if (hpp->enable_perr)
  55                 pci_cmd |= PCI_COMMAND_PARITY;
  56         else
  57                 pci_cmd &= ~PCI_COMMAND_PARITY;
  58         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
  59
  60         /* Program bridge control value */
  61         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
  62                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
  63                                       hpp->latency_timer);
  64                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
  65                 if (hpp->enable_serr)
  66                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
  67                 else
  68                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
  69                 if (hpp->enable_perr)
  70                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
  71                 else
  72                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
  73                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
  74         }
  75 }
  76
  77 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
  78 {
  79         int pos;
  80         u16 reg16;
  81         u32 reg32;
  82
  83         if (hpp->revision > 1) {
  84                 printk(KERN_WARNING "%s: Rev.%d type2 record not supported\n",
  85                        __func__, hpp->revision);
  86                 return;
  87         }
  88
  89         /* Find PCI Express capability */
  90         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  91         if (!pos)
  92                 return;
  93
  94         /* Initialize Device Control Register */
  95         pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
  96         reg16 = (reg16 & hpp->pci_exp_devctl_and) | hpp->pci_exp_devctl_or;
  97         pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
  98
  99         /* Initialize Link Control Register */
 100         if (dev->subordinate) {
 101                 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &reg16);
 102                 reg16 = (reg16 & hpp->pci_exp_lnkctl_and)
 103                         | hpp->pci_exp_lnkctl_or;
 104                 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, reg16);
 105         }
 106
 107         /* Find Advanced Error Reporting Enhanced Capability */
 108         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 109         if (!pos)
 110                 return;
 111
 112         /* Initialize Uncorrectable Error Mask Register */
 113         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &reg32);
 114         reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
 115         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
 116
 117         /* Initialize Uncorrectable Error Severity Register */
 118         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &reg32);
 119         reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
 120         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
 121
 122         /* Initialize Correctable Error Mask Register */
 123         pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &reg32);
 124         reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
 125         pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
 126
 127         /* Initialize Advanced Error Capabilities and Control Register */
 128         pci_read_config_dword(dev, pos + PCI_ERR_CAP, &reg32);
 129         reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
 130         pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
 131
 132         /*
 133          * FIXME: The following two registers are not supported yet.
 134          *
 135          *   o Secondary Uncorrectable Error Severity Register
 136          *   o Secondary Uncorrectable Error Mask Register
 137          */
 138 }
 139
 140 static void program_fw_provided_values(struct pci_dev *dev)
 141 {
 142         struct pci_dev *cdev;
 143         struct hotplug_params hpp;
 144
 145         /* Program hpp values for this device */
 146         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
 147                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
 148                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
 149                 return;
 150
 151         if (pciehp_get_hp_params_from_firmware(dev, &hpp)) {
 152                 printk(KERN_WARNING "%s: Could not get hotplug parameters\n",
 153                        __func__);
 154                 return;
 155         }
 156
 157         if (hpp.t2)
 158                 program_hpp_type2(dev, hpp.t2);
 159         if (hpp.t0)
 160                 program_hpp_type0(dev, hpp.t0);
 161
 162         /* Program child devices */
 163         if (dev->subordinate) {
 164                 list_for_each_entry(cdev, &dev->subordinate->devices,
 165                                     bus_list)
 166                         program_fw_provided_values(cdev);
 167         }
 168 }
 169
 170 static int __ref pciehp_add_bridge(struct pci_dev *dev)
 171 {
 172         struct pci_bus *parent = dev->bus;
 173         int pass, busnr, start = parent->secondary;
 174         int end = parent->subordinate;
 175
 176         for (busnr = start; busnr <= end; busnr++) {
 177                 if (!pci_find_bus(pci_domain_nr(parent), busnr))
 178                         break;
 179         }
 180         if (busnr-- > end) {
 181                 err("No bus number available for hot-added bridge %s\n",
 182                                 pci_name(dev));
 183                 return -1;
 184         }
 185         for (pass = 0; pass < 2; pass++)
 186                 busnr = pci_scan_bridge(parent, dev, busnr, pass);
 187         if (!dev->subordinate)
 188                 return -1;
 189         pci_bus_size_bridges(dev->subordinate);
 190         pci_bus_assign_resources(parent);
 191         pci_enable_bridges(parent);
 192         pci_bus_add_devices(parent);
 193         return 0;
 194 }
 195
 196 int pciehp_configure_device(struct slot *p_slot)
 197 {
 198         struct pci_dev *dev;
 199         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 200         int num, fn;
 201
 202         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
 203         if (dev) {
 204                 err("Device %s already exists at %x:%x, cannot hot-add\n",
 205                                 pci_name(dev), p_slot->bus, p_slot->device);
 206                 pci_dev_put(dev);
 207                 return -EINVAL;
 208         }
 209
 210         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
 211         if (num == 0) {
 212                 err("No new device found\n");
 213                 return -ENODEV;
 214         }
 215
 216         for (fn = 0; fn < 8; fn++) {
 217                 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
 218                 if (!dev)
 219                         continue;
 220                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 221                         err("Cannot hot-add display device %s\n",
 222                                         pci_name(dev));
 223                         pci_dev_put(dev);
 224                         continue;
 225                 }
 226                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
 227                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
 228                         pciehp_add_bridge(dev);
 229                 }
 230                 program_fw_provided_values(dev);
 231                 pci_dev_put(dev);
 232         }
 233
 234         pci_bus_assign_resources(parent);
 235         pci_bus_add_devices(parent);
 236         return 0;
 237 }
 238
 239 int pciehp_unconfigure_device(struct slot *p_slot)
 240 {
 241         int ret, rc = 0;
 242         int j;
 243         u8 bctl = 0;
 244         u8 presence = 0;
 245         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 246         u16 command;
 247
 248         dbg("%s: bus/dev = %x/%x\n", __func__, p_slot->bus,
 249                                 p_slot->device);
 250         ret = p_slot->hpc_ops->get_adapter_status(p_slot, &presence);
 251         if (ret)
 252                 presence = 0;
 253
 254         for (j = 0; j < 8; j++) {
 255                 struct pci_dev* temp = pci_get_slot(parent,
 256                                 (p_slot->device << 3) | j);
 257                 if (!temp)
 258                         continue;
 259                 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 260                         err("Cannot remove display device %s\n",
 261                                         pci_name(temp));
 262                         pci_dev_put(temp);
 263                         continue;
 264                 }
 265                 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
 266                         pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
 267                         if (bctl & PCI_BRIDGE_CTL_VGA) {
 268                                 err("Cannot remove display device %s\n",
 269                                     pci_name(temp));
 270                                 pci_dev_put(temp);
 271                                 continue;
 272                         }
 273                 }
 274                 pci_remove_bus_device(temp);
 275                 /*
 276                  * Ensure that no new Requests will be generated from
 277                  * the device.
 278                  */
 279                 if (presence) {
 280                         pci_read_config_word(temp, PCI_COMMAND, &command);
 281                         command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
 282                         command |= PCI_COMMAND_INTX_DISABLE;
 283                         pci_write_config_word(temp, PCI_COMMAND, command);
 284                 }
 285                 pci_dev_put(temp);
 286         }
 287         /*
 288          * Some PCI Express root ports require fixup after hot-plug operation.
 289          */
 290         if (pcie_mch_quirk)
 291                 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev);
 292
 293         return rc;
 294 }