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                 warn("Rev.%d type0 record not supported\n", hpp->revision);
  43                 return;
  44         }
  45
  46         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
  47         pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
  48         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
  49         if (hpp->enable_serr)
  50                 pci_cmd |= PCI_COMMAND_SERR;
  51         else
  52                 pci_cmd &= ~PCI_COMMAND_SERR;
  53         if (hpp->enable_perr)
  54                 pci_cmd |= PCI_COMMAND_PARITY;
  55         else
  56                 pci_cmd &= ~PCI_COMMAND_PARITY;
  57         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
  58
  59         /* Program bridge control value */
  60         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
  61                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
  62                                       hpp->latency_timer);
  63                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
  64                 if (hpp->enable_serr)
  65                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
  66                 else
  67                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
  68                 if (hpp->enable_perr)
  69                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
  70                 else
  71                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
  72                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
  73         }
  74 }
  75
  76 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
  77 {
  78         int pos;
  79         u16 reg16;
  80         u32 reg32;
  81
  82         if (hpp->revision > 1) {
  83                 warn("Rev.%d type2 record not supported\n", hpp->revision);
  84                 return;
  85         }
  86
  87         /* Find PCI Express capability */
  88         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
  89         if (!pos)
  90                 return;
  91
  92         /* Initialize Device Control Register */
  93         pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
  94         reg16 = (reg16 & hpp->pci_exp_devctl_and) | hpp->pci_exp_devctl_or;
  95         pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
  96
  97         /* Initialize Link Control Register */
  98         if (dev->subordinate) {
  99                 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &reg16);
 100                 reg16 = (reg16 & hpp->pci_exp_lnkctl_and)
 101                         | hpp->pci_exp_lnkctl_or;
 102                 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, reg16);
 103         }
 104
 105         /* Find Advanced Error Reporting Enhanced Capability */
 106         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 107         if (!pos)
 108                 return;
 109
 110         /* Initialize Uncorrectable Error Mask Register */
 111         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &reg32);
 112         reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
 113         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
 114
 115         /* Initialize Uncorrectable Error Severity Register */
 116         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &reg32);
 117         reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
 118         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
 119
 120         /* Initialize Correctable Error Mask Register */
 121         pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &reg32);
 122         reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
 123         pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
 124
 125         /* Initialize Advanced Error Capabilities and Control Register */
 126         pci_read_config_dword(dev, pos + PCI_ERR_CAP, &reg32);
 127         reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
 128         pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
 129
 130         /*
 131          * FIXME: The following two registers are not supported yet.
 132          *
 133          *   o Secondary Uncorrectable Error Severity Register
 134          *   o Secondary Uncorrectable Error Mask Register
 135          */
 136 }
 137
 138 static void program_fw_provided_values(struct pci_dev *dev)
 139 {
 140         struct pci_dev *cdev;
 141         struct hotplug_params hpp;
 142
 143         /* Program hpp values for this device */
 144         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
 145                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
 146                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
 147                 return;
 148
 149         if (pciehp_get_hp_params_from_firmware(dev, &hpp)) {
 150                 warn("Could not get hotplug parameters\n");
 151                 return;
 152         }
 153
 154         if (hpp.t2)
 155                 program_hpp_type2(dev, hpp.t2);
 156         if (hpp.t0)
 157                 program_hpp_type0(dev, hpp.t0);
 158
 159         /* Program child devices */
 160         if (dev->subordinate) {
 161                 list_for_each_entry(cdev, &dev->subordinate->devices,
 162                                     bus_list)
 163                         program_fw_provided_values(cdev);
 164         }
 165 }
 166
 167 static int __ref pciehp_add_bridge(struct pci_dev *dev)
 168 {
 169         struct pci_bus *parent = dev->bus;
 170         int pass, busnr, start = parent->secondary;
 171         int end = parent->subordinate;
 172
 173         for (busnr = start; busnr <= end; busnr++) {
 174                 if (!pci_find_bus(pci_domain_nr(parent), busnr))
 175                         break;
 176         }
 177         if (busnr-- > end) {
 178                 err("No bus number available for hot-added bridge %s\n",
 179                                 pci_name(dev));
 180                 return -1;
 181         }
 182         for (pass = 0; pass < 2; pass++)
 183                 busnr = pci_scan_bridge(parent, dev, busnr, pass);
 184         if (!dev->subordinate)
 185                 return -1;
 186         pci_bus_size_bridges(dev->subordinate);
 187         pci_bus_assign_resources(parent);
 188         pci_enable_bridges(parent);
 189         pci_bus_add_devices(parent);
 190         return 0;
 191 }
 192
 193 int pciehp_configure_device(struct slot *p_slot)
 194 {
 195         struct pci_dev *dev;
 196         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 197         int num, fn;
 198         struct controller *ctrl = p_slot->ctrl;
 199
 200         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
 201         if (dev) {
 202                 ctrl_err(ctrl, "Device %s already exists "
 203                          "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev),
 204                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
 205                 pci_dev_put(dev);
 206                 return -EINVAL;
 207         }
 208
 209         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
 210         if (num == 0) {
 211                 ctrl_err(ctrl, "No new device found\n");
 212                 return -ENODEV;
 213         }
 214
 215         for (fn = 0; fn < 8; fn++) {
 216                 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
 217                 if (!dev)
 218                         continue;
 219                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 220                         ctrl_err(ctrl, "Cannot hot-add display device %s\n",
 221                                  pci_name(dev));
 222                         pci_dev_put(dev);
 223                         continue;
 224                 }
 225                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
 226                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
 227                         pciehp_add_bridge(dev);
 228                 }
 229                 program_fw_provided_values(dev);
 230                 pci_dev_put(dev);
 231         }
 232
 233         pci_bus_assign_resources(parent);
 234         pci_bus_add_devices(parent);
 235         return 0;
 236 }
 237
 238 int pciehp_unconfigure_device(struct slot *p_slot)
 239 {
 240         int ret, rc = 0;
 241         int j;
 242         u8 bctl = 0;
 243         u8 presence = 0;
 244         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 245         u16 command;
 246         struct controller *ctrl = p_slot->ctrl;
 247
 248         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
 249                  __func__, pci_domain_nr(parent), p_slot->bus, 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                         ctrl_err(ctrl, "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                                 ctrl_err(ctrl,
 269                                          "Cannot remove display device %s\n",
 270                                          pci_name(temp));
 271                                 pci_dev_put(temp);
 272                                 continue;
 273                         }
 274                 }
 275                 pci_remove_bus_device(temp);
 276                 /*
 277                  * Ensure that no new Requests will be generated from
 278                  * the device.
 279                  */
 280                 if (presence) {
 281                         pci_read_config_word(temp, PCI_COMMAND, &command);
 282                         command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
 283                         command |= PCI_COMMAND_INTX_DISABLE;
 284                         pci_write_config_word(temp, PCI_COMMAND, command);
 285                 }
 286                 pci_dev_put(temp);
 287         }
 288         /*
 289          * Some PCI Express root ports require fixup after hot-plug operation.
 290          */
 291         if (pcie_mch_quirk)
 292                 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev);
 293
 294         return rc;
 295 }