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