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.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