err.no Git - linux-2.6/blob - drivers/acpi/pci_bind.c

   1 /*
   2  *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
   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
  39 #define _COMPONENT              ACPI_PCI_COMPONENT
  40 ACPI_MODULE_NAME                ("pci_bind")
  41
  42 struct acpi_pci_data {
  43         struct acpi_pci_id      id;
  44         struct pci_bus          *bus;
  45         struct pci_dev          *dev;
  46 };
  47
  48
  49 void
  50 acpi_pci_data_handler (
  51         acpi_handle             handle,
  52         u32                     function,
  53         void                    *context)
  54 {
  55         ACPI_FUNCTION_TRACE("acpi_pci_data_handler");
  56
  57         /* TBD: Anything we need to do here? */
  58
  59         return_VOID;
  60 }
  61
  62
  63 /**
  64  * acpi_os_get_pci_id
  65  * ------------------
  66  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
  67  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
  68  * This typically occurs when resolving PCI operation region information.
  69  */
  70 #ifdef ACPI_FUTURE_USAGE
  71 acpi_status
  72 acpi_os_get_pci_id (
  73         acpi_handle             handle,
  74         struct acpi_pci_id      *id)
  75 {
  76         int                     result = 0;
  77         acpi_status             status = AE_OK;
  78         struct acpi_device      *device = NULL;
  79         struct acpi_pci_data    *data = NULL;
  80
  81         ACPI_FUNCTION_TRACE("acpi_os_get_pci_id");
  82
  83         if (!id)
  84                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  85
  86         result = acpi_bus_get_device(handle, &device);
  87         if (result) {
  88                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  89                         "Invalid ACPI Bus context for device %s\n",
  90                         acpi_device_bid(device)));
  91                 return_ACPI_STATUS(AE_NOT_EXIST);
  92         }
  93
  94         status = acpi_get_data(handle, acpi_pci_data_handler, (void**) &data);
  95         if (ACPI_FAILURE(status) || !data || !data->dev) {
  96                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  97                         "Invalid ACPI-PCI context for device %s\n",
  98                         acpi_device_bid(device)));
  99                 return_ACPI_STATUS(status);
 100         }
 101
 102         *id = data->id;
 103
 104         /*
 105         id->segment = data->id.segment;
 106         id->bus = data->id.bus;
 107         id->device = data->id.device;
 108         id->function = data->id.function;
 109         */
 110
 111         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 112                 "Device %s has PCI address %02x:%02x:%02x.%02x\n",
 113                 acpi_device_bid(device), id->segment, id->bus,
 114                 id->device, id->function));
 115
 116         return_ACPI_STATUS(AE_OK);
 117 }
 118 #endif  /*  ACPI_FUTURE_USAGE  */
 119
 120
 121 int
 122 acpi_pci_bind (
 123         struct acpi_device      *device)
 124 {
 125         int                     result = 0;
 126         acpi_status             status = AE_OK;
 127         struct acpi_pci_data    *data = NULL;
 128         struct acpi_pci_data    *pdata = NULL;
 129         char                    *pathname = NULL;
 130         struct acpi_buffer      buffer = {0, NULL};
 131         acpi_handle             handle = NULL;
 132         struct pci_dev          *dev;
 133         struct pci_bus          *bus;
 134
 135         ACPI_FUNCTION_TRACE("acpi_pci_bind");
 136
 137         if (!device || !device->parent)
 138                 return_VALUE(-EINVAL);
 139
 140         pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 141         if(!pathname)
 142                 return_VALUE(-ENOMEM);
 143         memset(pathname, 0, ACPI_PATHNAME_MAX);
 144         buffer.length = ACPI_PATHNAME_MAX;
 145         buffer.pointer = pathname;
 146
 147         data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 148         if (!data){
 149                 kfree (pathname);
 150                 return_VALUE(-ENOMEM);
 151         }
 152         memset(data, 0, sizeof(struct acpi_pci_data));
 153
 154         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 155         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
 156                 pathname));
 157
 158         /*
 159          * Segment & Bus
 160          * -------------
 161          * These are obtained via the parent device's ACPI-PCI context.
 162          */
 163         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
 164                 (void**) &pdata);
 165         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
 166                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 167                         "Invalid ACPI-PCI context for parent device %s\n",
 168                         acpi_device_bid(device->parent)));
 169                 result = -ENODEV;
 170                 goto end;
 171         }
 172         data->id.segment = pdata->id.segment;
 173         data->id.bus = pdata->bus->number;
 174
 175         /*
 176          * Device & Function
 177          * -----------------
 178          * These are simply obtained from the device's _ADR method.  Note
 179          * that a value of zero is valid.
 180          */
 181         data->id.device = device->pnp.bus_address >> 16;
 182         data->id.function = device->pnp.bus_address & 0xFFFF;
 183
 184         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
 185                 data->id.segment, data->id.bus, data->id.device,
 186                 data->id.function));
 187
 188         /*
 189          * TBD: Support slot devices (e.g. function=0xFFFF).
 190          */
 191
 192         /*
 193          * Locate PCI Device
 194          * -----------------
 195          * Locate matching device in PCI namespace.  If it doesn't exist
 196          * this typically means that the device isn't currently inserted
 197          * (e.g. docking station, port replicator, etc.).
 198          * We cannot simply search the global pci device list, since
 199          * PCI devices are added to the global pci list when the root
 200          * bridge start ops are run, which may not have happened yet.
 201          */
 202         bus = pci_find_bus(data->id.segment, data->id.bus);
 203         if (bus) {
 204                 list_for_each_entry(dev, &bus->devices, bus_list) {
 205                         if (dev->devfn == PCI_DEVFN(data->id.device,
 206                                                 data->id.function)) {
 207                                 data->dev = dev;
 208                                 break;
 209                         }
 210                 }
 211         }
 212         if (!data->dev) {
 213                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 214                         "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
 215                         data->id.segment, data->id.bus,
 216                         data->id.device, data->id.function));
 217                 result = -ENODEV;
 218                 goto end;
 219         }
 220         if (!data->dev->bus) {
 221                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 222                         "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
 223                         data->id.segment, data->id.bus,
 224                         data->id.device, data->id.function));
 225                 result = -ENODEV;
 226                 goto end;
 227         }
 228
 229         /*
 230          * PCI Bridge?
 231          * -----------
 232          * If so, set the 'bus' field and install the 'bind' function to
 233          * facilitate callbacks for all of its children.
 234          */
 235         if (data->dev->subordinate) {
 236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 237                         "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
 238                         data->id.segment, data->id.bus,
 239                         data->id.device, data->id.function));
 240                 data->bus = data->dev->subordinate;
 241                 device->ops.bind = acpi_pci_bind;
 242                 device->ops.unbind = acpi_pci_unbind;
 243         }
 244
 245         /*
 246          * Attach ACPI-PCI Context
 247          * -----------------------
 248          * Thus binding the ACPI and PCI devices.
 249          */
 250         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 251         if (ACPI_FAILURE(status)) {
 252                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 253                         "Unable to attach ACPI-PCI context to device %s\n",
 254                         acpi_device_bid(device)));
 255                 result = -ENODEV;
 256                 goto end;
 257         }
 258
 259         /*
 260          * PCI Routing Table
 261          * -----------------
 262          * Evaluate and parse _PRT, if exists.  This code is independent of
 263          * PCI bridges (above) to allow parsing of _PRT objects within the
 264          * scope of non-bridge devices.  Note that _PRTs within the scope of
 265          * a PCI bridge assume the bridge's subordinate bus number.
 266          *
 267          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
 268          */
 269         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 270         if (ACPI_SUCCESS(status)) {
 271                 if (data->bus)                              /* PCI-PCI bridge */
 272                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 273                                 data->bus->number);
 274                 else                                 /* non-bridge PCI device */
 275                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 276                                 data->id.bus);
 277         }
 278
 279 end:
 280         kfree(pathname);
 281         if (result)
 282                 kfree(data);
 283
 284         return_VALUE(result);
 285 }
 286
 287 int acpi_pci_unbind(
 288         struct acpi_device      *device)
 289 {
 290         int                     result = 0;
 291         acpi_status             status = AE_OK;
 292         struct acpi_pci_data    *data = NULL;
 293         char                    *pathname = NULL;
 294         struct acpi_buffer      buffer = {0, NULL};
 295
 296         ACPI_FUNCTION_TRACE("acpi_pci_unbind");
 297
 298         if (!device || !device->parent)
 299                 return_VALUE(-EINVAL);
 300
 301         pathname = (char *) kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 302         if(!pathname)
 303                 return_VALUE(-ENOMEM);
 304         memset(pathname, 0, ACPI_PATHNAME_MAX);
 305
 306         buffer.length = ACPI_PATHNAME_MAX;
 307         buffer.pointer = pathname;
 308         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 309         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
 310                 pathname));
 311         kfree(pathname);
 312
 313         status = acpi_get_data(device->handle, acpi_pci_data_handler, (void**)&data);
 314         if (ACPI_FAILURE(status)) {
 315                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 316                         "Unable to get data from device %s\n",
 317                         acpi_device_bid(device)));
 318                 result = -ENODEV;
 319                 goto end;
 320         }
 321
 322         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
 323         if (ACPI_FAILURE(status)) {
 324                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 325                         "Unable to detach data from device %s\n",
 326                         acpi_device_bid(device)));
 327                 result = -ENODEV;
 328                 goto end;
 329         }
 330         if (data->dev->subordinate) {
 331                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
 332         }
 333         kfree(data);
 334
 335 end:
 336         return_VALUE(result);
 337 }
 338
 339 int
 340 acpi_pci_bind_root (
 341         struct acpi_device      *device,
 342         struct acpi_pci_id      *id,
 343         struct pci_bus          *bus)
 344 {
 345         int                     result = 0;
 346         acpi_status             status = AE_OK;
 347         struct acpi_pci_data    *data = NULL;
 348         char                    *pathname = NULL;
 349         struct acpi_buffer      buffer = {0, NULL};
 350
 351         ACPI_FUNCTION_TRACE("acpi_pci_bind_root");
 352
 353         pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 354         if(!pathname)
 355                 return_VALUE(-ENOMEM);
 356         memset(pathname, 0, ACPI_PATHNAME_MAX);
 357
 358         buffer.length = ACPI_PATHNAME_MAX;
 359         buffer.pointer = pathname;
 360
 361         if (!device || !id || !bus){
 362                 kfree(pathname);
 363                 return_VALUE(-EINVAL);
 364         }
 365
 366         data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 367         if (!data){
 368                 kfree(pathname);
 369                 return_VALUE(-ENOMEM);
 370         }
 371         memset(data, 0, sizeof(struct acpi_pci_data));
 372
 373         data->id = *id;
 374         data->bus = bus;
 375         device->ops.bind = acpi_pci_bind;
 376         device->ops.unbind = acpi_pci_unbind;
 377
 378         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 379
 380         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
 381                 "%02x:%02x\n", pathname, id->segment, id->bus));
 382
 383         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 384         if (ACPI_FAILURE(status)) {
 385                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 386                         "Unable to attach ACPI-PCI context to device %s\n",
 387                         pathname));
 388                 result = -ENODEV;
 389                 goto end;
 390         }
 391
 392 end:
 393         kfree(pathname);
 394         if (result != 0)
 395                 kfree(data);
 396
 397         return_VALUE(result);
 398 }