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   1 /*
   2  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/pm.h>
  33 #include <linux/pci.h>
  34 #include <linux/acpi.h>
  35 #include <acpi/acpi_bus.h>
  36 #include <acpi/acpi_drivers.h>
  37
  38 #define _COMPONENT              ACPI_PCI_COMPONENT
  39 ACPI_MODULE_NAME("pci_root")
  40 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  41 #define ACPI_PCI_ROOT_HID               "PNP0A03"
  42 #define ACPI_PCI_ROOT_DRIVER_NAME       "ACPI PCI Root Bridge Driver"
  43 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  44 static int acpi_pci_root_add(struct acpi_device *device);
  45 static int acpi_pci_root_remove(struct acpi_device *device, int type);
  46 static int acpi_pci_root_start(struct acpi_device *device);
  47
  48 static struct acpi_driver acpi_pci_root_driver = {
  49         .name = ACPI_PCI_ROOT_DRIVER_NAME,
  50         .class = ACPI_PCI_ROOT_CLASS,
  51         .ids = ACPI_PCI_ROOT_HID,
  52         .ops = {
  53                 .add = acpi_pci_root_add,
  54                 .remove = acpi_pci_root_remove,
  55                 .start = acpi_pci_root_start,
  56                 },
  57 };
  58
  59 struct acpi_pci_root {
  60         struct list_head node;
  61         struct acpi_device * device;
  62         struct acpi_pci_id id;
  63         struct pci_bus *bus;
  64 };
  65
  66 static LIST_HEAD(acpi_pci_roots);
  67
  68 static struct acpi_pci_driver *sub_driver;
  69
  70 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
  71 {
  72         int n = 0;
  73         struct list_head *entry;
  74
  75         struct acpi_pci_driver **pptr = &sub_driver;
  76         while (*pptr)
  77                 pptr = &(*pptr)->next;
  78         *pptr = driver;
  79
  80         if (!driver->add)
  81                 return 0;
  82
  83         list_for_each(entry, &acpi_pci_roots) {
  84                 struct acpi_pci_root *root;
  85                 root = list_entry(entry, struct acpi_pci_root, node);
  86                 driver->add(root->device->handle);
  87                 n++;
  88         }
  89
  90         return n;
  91 }
  92
  93 EXPORT_SYMBOL(acpi_pci_register_driver);
  94
  95 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
  96 {
  97         struct list_head *entry;
  98
  99         struct acpi_pci_driver **pptr = &sub_driver;
 100         while (*pptr) {
 101                 if (*pptr != driver)
 102                         continue;
 103                 *pptr = (*pptr)->next;
 104                 break;
 105         }
 106
 107         if (!driver->remove)
 108                 return;
 109
 110         list_for_each(entry, &acpi_pci_roots) {
 111                 struct acpi_pci_root *root;
 112                 root = list_entry(entry, struct acpi_pci_root, node);
 113                 driver->remove(root->device->handle);
 114         }
 115 }
 116
 117 EXPORT_SYMBOL(acpi_pci_unregister_driver);
 118
 119 static acpi_status
 120 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 121 {
 122         int *busnr = (int *)data;
 123         struct acpi_resource_address64 address;
 124
 125         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
 126             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
 127             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
 128                 return AE_OK;
 129
 130         acpi_resource_to_address64(resource, &address);
 131         if ((address.address_length > 0) &&
 132             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
 133                 *busnr = address.minimum;
 134
 135         return AE_OK;
 136 }
 137
 138 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
 139 {
 140         acpi_status status;
 141
 142         *busnum = -1;
 143         status =
 144             acpi_walk_resources(handle, METHOD_NAME__CRS,
 145                                 get_root_bridge_busnr_callback, busnum);
 146         if (ACPI_FAILURE(status))
 147                 return status;
 148         /* Check if we really get a bus number from _CRS */
 149         if (*busnum == -1)
 150                 return AE_ERROR;
 151         return AE_OK;
 152 }
 153
 154 static void acpi_pci_bridge_scan(struct acpi_device *device)
 155 {
 156         int status;
 157         struct acpi_device *child = NULL;
 158
 159         if (device->flags.bus_address)
 160                 if (device->parent && device->parent->ops.bind) {
 161                         status = device->parent->ops.bind(device);
 162                         if (!status) {
 163                                 list_for_each_entry(child, &device->children, node)
 164                                         acpi_pci_bridge_scan(child);
 165                         }
 166                 }
 167 }
 168
 169 static int acpi_pci_root_add(struct acpi_device *device)
 170 {
 171         int result = 0;
 172         struct acpi_pci_root *root = NULL;
 173         struct acpi_pci_root *tmp;
 174         acpi_status status = AE_OK;
 175         unsigned long value = 0;
 176         acpi_handle handle = NULL;
 177         struct acpi_device *child;
 178
 179
 180         if (!device)
 181                 return -EINVAL;
 182
 183         root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 184         if (!root)
 185                 return -ENOMEM;
 186         memset(root, 0, sizeof(struct acpi_pci_root));
 187         INIT_LIST_HEAD(&root->node);
 188
 189         root->device = device;
 190         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 191         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 192         acpi_driver_data(device) = root;
 193
 194         device->ops.bind = acpi_pci_bind;
 195
 196         /*
 197          * Segment
 198          * -------
 199          * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
 200          */
 201         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
 202                                        &value);
 203         switch (status) {
 204         case AE_OK:
 205                 root->id.segment = (u16) value;
 206                 break;
 207         case AE_NOT_FOUND:
 208                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 209                                   "Assuming segment 0 (no _SEG)\n"));
 210                 root->id.segment = 0;
 211                 break;
 212         default:
 213                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
 214                 result = -ENODEV;
 215                 goto end;
 216         }
 217
 218         /*
 219          * Bus
 220          * ---
 221          * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
 222          */
 223         status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
 224                                        &value);
 225         switch (status) {
 226         case AE_OK:
 227                 root->id.bus = (u16) value;
 228                 break;
 229         case AE_NOT_FOUND:
 230                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
 231                 root->id.bus = 0;
 232                 break;
 233         default:
 234                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
 235                 result = -ENODEV;
 236                 goto end;
 237         }
 238
 239         /* Some systems have wrong _BBN */
 240         list_for_each_entry(tmp, &acpi_pci_roots, node) {
 241                 if ((tmp->id.segment == root->id.segment)
 242                     && (tmp->id.bus == root->id.bus)) {
 243                         int bus = 0;
 244                         acpi_status status;
 245
 246                         printk(KERN_ERR PREFIX
 247                                     "Wrong _BBN value, reboot"
 248                                     " and use option 'pci=noacpi'\n");
 249
 250                         status = try_get_root_bridge_busnr(device->handle, &bus);
 251                         if (ACPI_FAILURE(status))
 252                                 break;
 253                         if (bus != root->id.bus) {
 254                                 printk(KERN_INFO PREFIX
 255                                        "PCI _CRS %d overrides _BBN 0\n", bus);
 256                                 root->id.bus = bus;
 257                         }
 258                         break;
 259                 }
 260         }
 261         /*
 262          * Device & Function
 263          * -----------------
 264          * Obtained from _ADR (which has already been evaluated for us).
 265          */
 266         root->id.device = device->pnp.bus_address >> 16;
 267         root->id.function = device->pnp.bus_address & 0xFFFF;
 268
 269         /*
 270          * TBD: Need PCI interface for enumeration/configuration of roots.
 271          */
 272
 273         /* TBD: Locking */
 274         list_add_tail(&root->node, &acpi_pci_roots);
 275
 276         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
 277                acpi_device_name(device), acpi_device_bid(device),
 278                root->id.segment, root->id.bus);
 279
 280         /*
 281          * Scan the Root Bridge
 282          * --------------------
 283          * Must do this prior to any attempt to bind the root device, as the
 284          * PCI namespace does not get created until this call is made (and
 285          * thus the root bridge's pci_dev does not exist).
 286          */
 287         root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
 288         if (!root->bus) {
 289                 printk(KERN_ERR PREFIX
 290                             "Bus %04x:%02x not present in PCI namespace\n",
 291                             root->id.segment, root->id.bus);
 292                 result = -ENODEV;
 293                 goto end;
 294         }
 295
 296         /*
 297          * Attach ACPI-PCI Context
 298          * -----------------------
 299          * Thus binding the ACPI and PCI devices.
 300          */
 301         result = acpi_pci_bind_root(device, &root->id, root->bus);
 302         if (result)
 303                 goto end;
 304
 305         /*
 306          * PCI Routing Table
 307          * -----------------
 308          * Evaluate and parse _PRT, if exists.
 309          */
 310         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 311         if (ACPI_SUCCESS(status))
 312                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
 313                                               root->id.bus);
 314
 315         /*
 316          * Scan and bind all _ADR-Based Devices
 317          */
 318         list_for_each_entry(child, &device->children, node)
 319                 acpi_pci_bridge_scan(child);
 320
 321       end:
 322         if (result) {
 323                 if (!list_empty(&root->node))
 324                         list_del(&root->node);
 325                 kfree(root);
 326         }
 327
 328         return result;
 329 }
 330
 331 static int acpi_pci_root_start(struct acpi_device *device)
 332 {
 333         struct acpi_pci_root *root;
 334
 335
 336         list_for_each_entry(root, &acpi_pci_roots, node) {
 337                 if (root->device == device) {
 338                         pci_bus_add_devices(root->bus);
 339                         return 0;
 340                 }
 341         }
 342         return -ENODEV;
 343 }
 344
 345 static int acpi_pci_root_remove(struct acpi_device *device, int type)
 346 {
 347         struct acpi_pci_root *root = NULL;
 348
 349
 350         if (!device || !acpi_driver_data(device))
 351                 return -EINVAL;
 352
 353         root = (struct acpi_pci_root *)acpi_driver_data(device);
 354
 355         kfree(root);
 356
 357         return 0;
 358 }
 359
 360 static int __init acpi_pci_root_init(void)
 361 {
 362
 363         if (acpi_pci_disabled)
 364                 return 0;
 365
 366         /* DEBUG:
 367            acpi_dbg_layer = ACPI_PCI_COMPONENT;
 368            acpi_dbg_level = 0xFFFFFFFF;
 369          */
 370
 371         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 372                 return -ENODEV;
 373
 374         return 0;
 375 }
 376
 377 subsys_initcall(acpi_pci_root_init);