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 = {0x8, 0x40, 0, 0}; /* defaults */
  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         get_hp_params_from_firmware(dev, &hpp);
  50
  51         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp.cache_line_size);
  52         pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.latency_timer);
  53         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
  54         if (hpp.enable_serr)
  55                 pci_cmd |= PCI_COMMAND_SERR;
  56         else
  57                 pci_cmd &= ~PCI_COMMAND_SERR;
  58         if (hpp.enable_perr)
  59                 pci_cmd |= PCI_COMMAND_PARITY;
  60         else
  61                 pci_cmd &= ~PCI_COMMAND_PARITY;
  62         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
  63
  64         /* Program bridge control value and child devices */
  65         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
  66                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
  67                                 hpp.latency_timer);
  68                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
  69                 if (hpp.enable_serr)
  70                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
  71                 else
  72                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
  73                 if (hpp.enable_perr)
  74                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
  75                 else
  76                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
  77                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
  78                 if (dev->subordinate) {
  79                         list_for_each_entry(cdev, &dev->subordinate->devices,
  80                                         bus_list)
  81                                 program_fw_provided_values(cdev);
  82                 }
  83         }
  84 }
  85
  86 int shpchp_configure_device(struct slot *p_slot)
  87 {
  88         struct pci_dev *dev;
  89         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
  90         int num, fn;
  91
  92         dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0));
  93         if (dev) {
  94                 err("Device %s already exists at %x:%x, cannot hot-add\n",
  95                                 pci_name(dev), p_slot->bus, p_slot->device);
  96                 return -EINVAL;
  97         }
  98
  99         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
 100         if (num == 0) {
 101                 err("No new device found\n");
 102                 return -ENODEV;
 103         }
 104
 105         for (fn = 0; fn < 8; fn++) {
 106                 if (!(dev = pci_find_slot(p_slot->bus,
 107                                         PCI_DEVFN(p_slot->device, fn))))
 108                         continue;
 109                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 110                         err("Cannot hot-add display device %s\n",
 111                                         pci_name(dev));
 112                         continue;
 113                 }
 114                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
 115                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
 116                         /* Find an unused bus number for the new bridge */
 117                         struct pci_bus *child;
 118                         unsigned char busnr, start = parent->secondary;
 119                         unsigned char end = parent->subordinate;
 120                         for (busnr = start; busnr <= end; busnr++) {
 121                                 if (!pci_find_bus(pci_domain_nr(parent),
 122                                                         busnr))
 123                                         break;
 124                         }
 125                         if (busnr >= end) {
 126                                 err("No free bus for hot-added bridge\n");
 127                                 continue;
 128                         }
 129                         child = pci_add_new_bus(parent, dev, busnr);
 130                         if (!child) {
 131                                 err("Cannot add new bus for %s\n",
 132                                                 pci_name(dev));
 133                                 continue;
 134                         }
 135                         child->subordinate = pci_do_scan_bus(child);
 136                         pci_bus_size_bridges(child);
 137                 }
 138                 program_fw_provided_values(dev);
 139         }
 140
 141         pci_bus_assign_resources(parent);
 142         pci_bus_add_devices(parent);
 143         pci_enable_bridges(parent);
 144         return 0;
 145 }
 146
 147 int shpchp_unconfigure_device(struct slot *p_slot)
 148 {
 149         int rc = 0;
 150         int j;
 151         u8 bctl = 0;
 152
 153         dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, p_slot->device);
 154
 155         for (j=0; j<8 ; j++) {
 156                 struct pci_dev* temp = pci_find_slot(p_slot->bus,
 157                                 (p_slot->device << 3) | j);
 158                 if (!temp)
 159                         continue;
 160                 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 161                         err("Cannot remove display device %s\n",
 162                                         pci_name(temp));
 163                         continue;
 164                 }
 165                 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 166                         pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
 167                         if (bctl & PCI_BRIDGE_CTL_VGA) {
 168                                 err("Cannot remove display device %s\n",
 169                                                 pci_name(temp));
 170                                 continue;
 171                         }
 172                 }
 173                 pci_remove_bus_device(temp);
 174         }
 175         return rc;
 176 }
 177