drivers/pci/hotplug/shpchp_pci.c

   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                 printk(KERN_WARNING
  53                        "%s: Could not get hotplug parameters. Use defaults\n",
  54                        __func__);
  55                 hpp.t0 = &hpp.type0_data;
  56                 hpp.t0->revision = 0;
  57                 hpp.t0->cache_line_size = 8;
  58                 hpp.t0->latency_timer = 0x40;
  59                 hpp.t0->enable_serr = 0;
  60                 hpp.t0->enable_perr = 0;
  61         }
  62
  63         pci_write_config_byte(dev,
  64                               PCI_CACHE_LINE_SIZE, hpp.t0->cache_line_size);
  65         pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.t0->latency_timer);
  66         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
  67         if (hpp.t0->enable_serr)
  68                 pci_cmd |= PCI_COMMAND_SERR;
  69         else
  70                 pci_cmd &= ~PCI_COMMAND_SERR;
  71         if (hpp.t0->enable_perr)
  72                 pci_cmd |= PCI_COMMAND_PARITY;
  73         else
  74                 pci_cmd &= ~PCI_COMMAND_PARITY;
  75         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
  76
  77         /* Program bridge control value and child devices */
  78         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
  79                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
  80                                 hpp.t0->latency_timer);
  81                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
  82                 if (hpp.t0->enable_serr)
  83                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
  84                 else
  85                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
  86                 if (hpp.t0->enable_perr)
  87                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
  88                 else
  89                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
  90                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
  91                 if (dev->subordinate) {
  92                         list_for_each_entry(cdev, &dev->subordinate->devices,
  93                                         bus_list)
  94                                 program_fw_provided_values(cdev);
  95                 }
  96         }
  97 }
  98
  99 int __ref shpchp_configure_device(struct slot *p_slot)
 100 {
 101         struct pci_dev *dev;
 102         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 103         int num, fn;
 104
 105         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
 106         if (dev) {
 107                 err("Device %s already exists at %x:%x, cannot hot-add\n",
 108                                 pci_name(dev), 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                 err("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                         err("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                                 err("No free bus for hot-added bridge\n");
 142                                 pci_dev_put(dev);
 143                                 continue;
 144                         }
 145                         child = pci_add_new_bus(parent, dev, busnr);
 146                         if (!child) {
 147                                 err("Cannot add new bus for %s\n",
 148                                                 pci_name(dev));
 149                                 pci_dev_put(dev);
 150                                 continue;
 151                         }
 152                         child->subordinate = pci_do_scan_bus(child);
 153                         pci_bus_size_bridges(child);
 154                 }
 155                 program_fw_provided_values(dev);
 156                 pci_dev_put(dev);
 157         }
 158
 159         pci_bus_assign_resources(parent);
 160         pci_bus_add_devices(parent);
 161         pci_enable_bridges(parent);
 162         return 0;
 163 }
 164
 165 int shpchp_unconfigure_device(struct slot *p_slot)
 166 {
 167         int rc = 0;
 168         int j;
 169         u8 bctl = 0;
 170         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 171
 172         dbg("%s: bus/dev = %x/%x\n", __func__, p_slot->bus, p_slot->device);
 173
 174         for (j=0; j<8 ; j++) {
 175                 struct pci_dev* temp = pci_get_slot(parent,
 176                                 (p_slot->device << 3) | j);
 177                 if (!temp)
 178                         continue;
 179                 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 180                         err("Cannot remove display device %s\n",
 181                                         pci_name(temp));
 182                         pci_dev_put(temp);
 183                         continue;
 184                 }
 185                 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 186                         pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
 187                         if (bctl & PCI_BRIDGE_CTL_VGA) {
 188                                 err("Cannot remove display device %s\n",
 189                                                 pci_name(temp));
 190                                 pci_dev_put(temp);
 191                                 continue;
 192                         }
 193                 }
 194                 pci_remove_bus_device(temp);
 195                 pci_dev_put(temp);
 196         }
 197         return rc;
 198 }
 199