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 static int acpi_pci_unbind(struct acpi_device *device);
  48
  49 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
  50                                   void *context)
  51 {
  52
  53         /* TBD: Anything we need to do here? */
  54
  55         return;
  56 }
  57
  58 /**
  59  * acpi_get_pci_id
  60  * ------------------
  61  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
  62  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
  63  * This typically occurs when resolving PCI operation region information.
  64  */
  65 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
  66 {
  67         int result = 0;
  68         acpi_status status = AE_OK;
  69         struct acpi_device *device = NULL;
  70         struct acpi_pci_data *data = NULL;
  71
  72
  73         if (!id)
  74                 return AE_BAD_PARAMETER;
  75
  76         result = acpi_bus_get_device(handle, &device);
  77         if (result) {
  78                 printk(KERN_ERR PREFIX
  79                             "Invalid ACPI Bus context for device %s\n",
  80                             acpi_device_bid(device));
  81                 return AE_NOT_EXIST;
  82         }
  83
  84         status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
  85         if (ACPI_FAILURE(status) || !data) {
  86                 ACPI_EXCEPTION((AE_INFO, status,
  87                                 "Invalid ACPI-PCI context for device %s",
  88                                 acpi_device_bid(device)));
  89                 return status;
  90         }
  91
  92         *id = data->id;
  93
  94         /*
  95            id->segment = data->id.segment;
  96            id->bus = data->id.bus;
  97            id->device = data->id.device;
  98            id->function = data->id.function;
  99          */
 100
 101         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 102                           "Device %s has PCI address %04x:%02x:%02x.%d\n",
 103                           acpi_device_bid(device), id->segment, id->bus,
 104                           id->device, id->function));
 105
 106         return AE_OK;
 107 }
 108
 109 EXPORT_SYMBOL(acpi_get_pci_id);
 110
 111 int acpi_pci_bind(struct acpi_device *device)
 112 {
 113         int result = 0;
 114         acpi_status status;
 115         struct acpi_pci_data *data;
 116         struct acpi_pci_data *pdata;
 117         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 118         acpi_handle handle;
 119         struct pci_dev *dev;
 120         struct pci_bus *bus;
 121
 122
 123         if (!device || !device->parent)
 124                 return -EINVAL;
 125
 126         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 127         if (!data)
 128                 return -ENOMEM;
 129
 130         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 131         if (ACPI_FAILURE(status)) {
 132                 kfree(data);
 133                 return -ENODEV;
 134         }
 135
 136         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
 137                           (char *)buffer.pointer));
 138
 139         /*
 140          * Segment & Bus
 141          * -------------
 142          * These are obtained via the parent device's ACPI-PCI context.
 143          */
 144         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
 145                                (void **)&pdata);
 146         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
 147                 ACPI_EXCEPTION((AE_INFO, status,
 148                                 "Invalid ACPI-PCI context for parent device %s",
 149                                 acpi_device_bid(device->parent)));
 150                 result = -ENODEV;
 151                 goto end;
 152         }
 153         data->id.segment = pdata->id.segment;
 154         data->id.bus = pdata->bus->number;
 155
 156         /*
 157          * Device & Function
 158          * -----------------
 159          * These are simply obtained from the device's _ADR method.  Note
 160          * that a value of zero is valid.
 161          */
 162         data->id.device = device->pnp.bus_address >> 16;
 163         data->id.function = device->pnp.bus_address & 0xFFFF;
 164
 165         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %04x:%02x:%02x.%d\n",
 166                           data->id.segment, data->id.bus, data->id.device,
 167                           data->id.function));
 168
 169         /*
 170          * TBD: Support slot devices (e.g. function=0xFFFF).
 171          */
 172
 173         /*
 174          * Locate PCI Device
 175          * -----------------
 176          * Locate matching device in PCI namespace.  If it doesn't exist
 177          * this typically means that the device isn't currently inserted
 178          * (e.g. docking station, port replicator, etc.).
 179          * We cannot simply search the global pci device list, since
 180          * PCI devices are added to the global pci list when the root
 181          * bridge start ops are run, which may not have happened yet.
 182          */
 183         bus = pci_find_bus(data->id.segment, data->id.bus);
 184         if (bus) {
 185                 list_for_each_entry(dev, &bus->devices, bus_list) {
 186                         if (dev->devfn == PCI_DEVFN(data->id.device,
 187                                                     data->id.function)) {
 188                                 data->dev = dev;
 189                                 break;
 190                         }
 191                 }
 192         }
 193         if (!data->dev) {
 194                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 195                                   "Device %04x:%02x:%02x.%d not present in PCI namespace\n",
 196                                   data->id.segment, data->id.bus,
 197                                   data->id.device, data->id.function));
 198                 result = -ENODEV;
 199                 goto end;
 200         }
 201         if (!data->dev->bus) {
 202                 printk(KERN_ERR PREFIX
 203                             "Device %04x:%02x:%02x.%d has invalid 'bus' field\n",
 204                             data->id.segment, data->id.bus,
 205                             data->id.device, data->id.function);
 206                 result = -ENODEV;
 207                 goto end;
 208         }
 209
 210         /*
 211          * PCI Bridge?
 212          * -----------
 213          * If so, set the 'bus' field and install the 'bind' function to
 214          * facilitate callbacks for all of its children.
 215          */
 216         if (data->dev->subordinate) {
 217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 218                                   "Device %04x:%02x:%02x.%d is a PCI bridge\n",
 219                                   data->id.segment, data->id.bus,
 220                                   data->id.device, data->id.function));
 221                 data->bus = data->dev->subordinate;
 222                 device->ops.bind = acpi_pci_bind;
 223                 device->ops.unbind = acpi_pci_unbind;
 224         }
 225
 226         /*
 227          * Attach ACPI-PCI Context
 228          * -----------------------
 229          * Thus binding the ACPI and PCI devices.
 230          */
 231         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 232         if (ACPI_FAILURE(status)) {
 233                 ACPI_EXCEPTION((AE_INFO, status,
 234                                 "Unable to attach ACPI-PCI context to device %s",
 235                                 acpi_device_bid(device)));
 236                 result = -ENODEV;
 237                 goto end;
 238         }
 239
 240         /*
 241          * PCI Routing Table
 242          * -----------------
 243          * Evaluate and parse _PRT, if exists.  This code is independent of
 244          * PCI bridges (above) to allow parsing of _PRT objects within the
 245          * scope of non-bridge devices.  Note that _PRTs within the scope of
 246          * a PCI bridge assume the bridge's subordinate bus number.
 247          *
 248          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
 249          */
 250         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 251         if (ACPI_SUCCESS(status)) {
 252                 if (data->bus)  /* PCI-PCI bridge */
 253                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 254                                              data->bus->number);
 255                 else            /* non-bridge PCI device */
 256                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 257                                              data->id.bus);
 258         }
 259
 260       end:
 261         kfree(buffer.pointer);
 262         if (result)
 263                 kfree(data);
 264
 265         return result;
 266 }
 267
 268 static int acpi_pci_unbind(struct acpi_device *device)
 269 {
 270         int result = 0;
 271         acpi_status status;
 272         struct acpi_pci_data *data;
 273         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 274
 275
 276         if (!device || !device->parent)
 277                 return -EINVAL;
 278
 279         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 280         if (ACPI_FAILURE(status))
 281                 return -ENODEV;
 282
 283         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
 284                           (char *) buffer.pointer));
 285         kfree(buffer.pointer);
 286
 287         status =
 288             acpi_get_data(device->handle, acpi_pci_data_handler,
 289                           (void **)&data);
 290         if (ACPI_FAILURE(status)) {
 291                 result = -ENODEV;
 292                 goto end;
 293         }
 294
 295         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
 296         if (ACPI_FAILURE(status)) {
 297                 ACPI_EXCEPTION((AE_INFO, status,
 298                                 "Unable to detach data from device %s",
 299                                 acpi_device_bid(device)));
 300                 result = -ENODEV;
 301                 goto end;
 302         }
 303         if (data->dev->subordinate) {
 304                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
 305         }
 306         kfree(data);
 307
 308       end:
 309         return result;
 310 }
 311
 312 int
 313 acpi_pci_bind_root(struct acpi_device *device,
 314                    struct acpi_pci_id *id, struct pci_bus *bus)
 315 {
 316         int result = 0;
 317         acpi_status status;
 318         struct acpi_pci_data *data = NULL;
 319         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 320
 321         if (!device || !id || !bus) {
 322                 return -EINVAL;
 323         }
 324
 325         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 326         if (!data)
 327                 return -ENOMEM;
 328
 329         data->id = *id;
 330         data->bus = bus;
 331         device->ops.bind = acpi_pci_bind;
 332         device->ops.unbind = acpi_pci_unbind;
 333
 334         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 335         if (ACPI_FAILURE(status)) {
 336                 kfree (data);
 337                 return -ENODEV;
 338         }
 339
 340         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
 341                         "%04x:%02x\n", (char *)buffer.pointer,
 342                         id->segment, id->bus));
 343
 344         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 345         if (ACPI_FAILURE(status)) {
 346                 ACPI_EXCEPTION((AE_INFO, status,
 347                                 "Unable to attach ACPI-PCI context to device %s",
 348                                 (char *)buffer.pointer));
 349                 result = -ENODEV;
 350                 goto end;
 351         }
 352
 353       end:
 354         kfree(buffer.pointer);
 355         if (result != 0)
 356                 kfree(data);
 357
 358         return result;
 359 }