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