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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 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
 120         if (!device || !device->parent)
 121                 return -EINVAL;
 122
 123         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 124         if (!data)
 125                 return -ENOMEM;
 126
 127         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 128         if (ACPI_FAILURE(status)) {
 129                 kfree(data);
 130                 return -ENODEV;
 131         }
 132
 133         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
 134                           (char *)buffer.pointer));
 135
 136         /*
 137          * Segment & Bus
 138          * -------------
 139          * These are obtained via the parent device's ACPI-PCI context.
 140          */
 141         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
 142                                (void **)&pdata);
 143         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
 144                 ACPI_EXCEPTION((AE_INFO, status,
 145                                 "Invalid ACPI-PCI context for parent device %s",
 146                                 acpi_device_bid(device->parent)));
 147                 result = -ENODEV;
 148                 goto end;
 149         }
 150         data->id.segment = pdata->id.segment;
 151         data->id.bus = pdata->bus->number;
 152
 153         /*
 154          * Device & Function
 155          * -----------------
 156          * These are simply obtained from the device's _ADR method.  Note
 157          * that a value of zero is valid.
 158          */
 159         data->id.device = device->pnp.bus_address >> 16;
 160         data->id.function = device->pnp.bus_address & 0xFFFF;
 161
 162         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %04x:%02x:%02x.%d\n",
 163                           data->id.segment, data->id.bus, data->id.device,
 164                           data->id.function));
 165
 166         /*
 167          * TBD: Support slot devices (e.g. function=0xFFFF).
 168          */
 169
 170         /*
 171          * Locate PCI Device
 172          * -----------------
 173          * Locate matching device in PCI namespace.  If it doesn't exist
 174          * this typically means that the device isn't currently inserted
 175          * (e.g. docking station, port replicator, etc.).
 176          */
 177         data->dev = pci_get_slot(pdata->bus,
 178                                 PCI_DEVFN(data->id.device, data->id.function));
 179         if (!data->dev) {
 180                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 181                                   "Device %04x:%02x:%02x.%d not present in PCI namespace\n",
 182                                   data->id.segment, data->id.bus,
 183                                   data->id.device, data->id.function));
 184                 result = -ENODEV;
 185                 goto end;
 186         }
 187         if (!data->dev->bus) {
 188                 printk(KERN_ERR PREFIX
 189                             "Device %04x:%02x:%02x.%d has invalid 'bus' field\n",
 190                             data->id.segment, data->id.bus,
 191                             data->id.device, data->id.function);
 192                 result = -ENODEV;
 193                 goto end;
 194         }
 195
 196         /*
 197          * PCI Bridge?
 198          * -----------
 199          * If so, set the 'bus' field and install the 'bind' function to
 200          * facilitate callbacks for all of its children.
 201          */
 202         if (data->dev->subordinate) {
 203                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 204                                   "Device %04x:%02x:%02x.%d is a PCI bridge\n",
 205                                   data->id.segment, data->id.bus,
 206                                   data->id.device, data->id.function));
 207                 data->bus = data->dev->subordinate;
 208                 device->ops.bind = acpi_pci_bind;
 209                 device->ops.unbind = acpi_pci_unbind;
 210         }
 211
 212         /*
 213          * Attach ACPI-PCI Context
 214          * -----------------------
 215          * Thus binding the ACPI and PCI devices.
 216          */
 217         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 218         if (ACPI_FAILURE(status)) {
 219                 ACPI_EXCEPTION((AE_INFO, status,
 220                                 "Unable to attach ACPI-PCI context to device %s",
 221                                 acpi_device_bid(device)));
 222                 result = -ENODEV;
 223                 goto end;
 224         }
 225
 226         /*
 227          * PCI Routing Table
 228          * -----------------
 229          * Evaluate and parse _PRT, if exists.  This code is independent of
 230          * PCI bridges (above) to allow parsing of _PRT objects within the
 231          * scope of non-bridge devices.  Note that _PRTs within the scope of
 232          * a PCI bridge assume the bridge's subordinate bus number.
 233          *
 234          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
 235          */
 236         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 237         if (ACPI_SUCCESS(status)) {
 238                 if (data->bus)  /* PCI-PCI bridge */
 239                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 240                                              data->bus->number);
 241                 else            /* non-bridge PCI device */
 242                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 243                                              data->id.bus);
 244         }
 245
 246       end:
 247         kfree(buffer.pointer);
 248         if (result) {
 249                 pci_dev_put(data->dev);
 250                 kfree(data);
 251         }
 252         return result;
 253 }
 254
 255 static int acpi_pci_unbind(struct acpi_device *device)
 256 {
 257         int result = 0;
 258         acpi_status status;
 259         struct acpi_pci_data *data;
 260         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 261
 262
 263         if (!device || !device->parent)
 264                 return -EINVAL;
 265
 266         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 267         if (ACPI_FAILURE(status))
 268                 return -ENODEV;
 269
 270         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
 271                           (char *) buffer.pointer));
 272         kfree(buffer.pointer);
 273
 274         status =
 275             acpi_get_data(device->handle, acpi_pci_data_handler,
 276                           (void **)&data);
 277         if (ACPI_FAILURE(status)) {
 278                 result = -ENODEV;
 279                 goto end;
 280         }
 281
 282         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
 283         if (ACPI_FAILURE(status)) {
 284                 ACPI_EXCEPTION((AE_INFO, status,
 285                                 "Unable to detach data from device %s",
 286                                 acpi_device_bid(device)));
 287                 result = -ENODEV;
 288                 goto end;
 289         }
 290         if (data->dev->subordinate) {
 291                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
 292         }
 293         pci_dev_put(data->dev);
 294         kfree(data);
 295
 296       end:
 297         return result;
 298 }
 299
 300 int
 301 acpi_pci_bind_root(struct acpi_device *device,
 302                    struct acpi_pci_id *id, struct pci_bus *bus)
 303 {
 304         int result = 0;
 305         acpi_status status;
 306         struct acpi_pci_data *data = NULL;
 307         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 308
 309         if (!device || !id || !bus) {
 310                 return -EINVAL;
 311         }
 312
 313         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 314         if (!data)
 315                 return -ENOMEM;
 316
 317         data->id = *id;
 318         data->bus = bus;
 319         device->ops.bind = acpi_pci_bind;
 320         device->ops.unbind = acpi_pci_unbind;
 321
 322         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 323         if (ACPI_FAILURE(status)) {
 324                 kfree (data);
 325                 return -ENODEV;
 326         }
 327
 328         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
 329                         "%04x:%02x\n", (char *)buffer.pointer,
 330                         id->segment, id->bus));
 331
 332         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 333         if (ACPI_FAILURE(status)) {
 334                 ACPI_EXCEPTION((AE_INFO, status,
 335                                 "Unable to attach ACPI-PCI context to device %s",
 336                                 (char *)buffer.pointer));
 337                 result = -ENODEV;
 338                 goto end;
 339         }
 340
 341       end:
 342         kfree(buffer.pointer);
 343         if (result != 0)
 344                 kfree(data);
 345
 346         return result;
 347 }