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   1 /*
   2  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
   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/pci-acpi.h>
  35 #include <linux/acpi.h>
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38
  39 #define _COMPONENT              ACPI_PCI_COMPONENT
  40 ACPI_MODULE_NAME("pci_root");
  41 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  42 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  43 static int acpi_pci_root_add(struct acpi_device *device);
  44 static int acpi_pci_root_remove(struct acpi_device *device, int type);
  45 static int acpi_pci_root_start(struct acpi_device *device);
  46
  47 static struct acpi_device_id root_device_ids[] = {
  48         {"PNP0A03", 0},
  49         {"", 0},
  50 };
  51 MODULE_DEVICE_TABLE(acpi, root_device_ids);
  52
  53 static struct acpi_driver acpi_pci_root_driver = {
  54         .name = "pci_root",
  55         .class = ACPI_PCI_ROOT_CLASS,
  56         .ids = root_device_ids,
  57         .ops = {
  58                 .add = acpi_pci_root_add,
  59                 .remove = acpi_pci_root_remove,
  60                 .start = acpi_pci_root_start,
  61                 },
  62 };
  63
  64 struct acpi_pci_root {
  65         struct list_head node;
  66         struct acpi_device * device;
  67         struct acpi_pci_id id;
  68         struct pci_bus *bus;
  69
  70         u32 osc_support_set;    /* _OSC state of support bits */
  71         u32 osc_control_set;    /* _OSC state of control bits */
  72         u32 osc_control_qry;    /* the latest _OSC query result */
  73
  74         u32 osc_queried:1;      /* has _OSC control been queried? */
  75 };
  76
  77 static LIST_HEAD(acpi_pci_roots);
  78
  79 static struct acpi_pci_driver *sub_driver;
  80 static DEFINE_MUTEX(osc_lock);
  81
  82 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
  83 {
  84         int n = 0;
  85         struct list_head *entry;
  86
  87         struct acpi_pci_driver **pptr = &sub_driver;
  88         while (*pptr)
  89                 pptr = &(*pptr)->next;
  90         *pptr = driver;
  91
  92         if (!driver->add)
  93                 return 0;
  94
  95         list_for_each(entry, &acpi_pci_roots) {
  96                 struct acpi_pci_root *root;
  97                 root = list_entry(entry, struct acpi_pci_root, node);
  98                 driver->add(root->device->handle);
  99                 n++;
 100         }
 101
 102         return n;
 103 }
 104
 105 EXPORT_SYMBOL(acpi_pci_register_driver);
 106
 107 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
 108 {
 109         struct list_head *entry;
 110
 111         struct acpi_pci_driver **pptr = &sub_driver;
 112         while (*pptr) {
 113                 if (*pptr == driver)
 114                         break;
 115                 pptr = &(*pptr)->next;
 116         }
 117         BUG_ON(!*pptr);
 118         *pptr = (*pptr)->next;
 119
 120         if (!driver->remove)
 121                 return;
 122
 123         list_for_each(entry, &acpi_pci_roots) {
 124                 struct acpi_pci_root *root;
 125                 root = list_entry(entry, struct acpi_pci_root, node);
 126                 driver->remove(root->device->handle);
 127         }
 128 }
 129
 130 EXPORT_SYMBOL(acpi_pci_unregister_driver);
 131
 132 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
 133 {
 134         struct acpi_pci_root *tmp;
 135
 136         list_for_each_entry(tmp, &acpi_pci_roots, node) {
 137                 if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
 138                         return tmp->device->handle;
 139         }
 140         return NULL;
 141 }
 142
 143 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
 144
 145 static acpi_status
 146 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 147 {
 148         int *busnr = data;
 149         struct acpi_resource_address64 address;
 150
 151         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
 152             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
 153             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
 154                 return AE_OK;
 155
 156         acpi_resource_to_address64(resource, &address);
 157         if ((address.address_length > 0) &&
 158             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
 159                 *busnr = address.minimum;
 160
 161         return AE_OK;
 162 }
 163
 164 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
 165                                              unsigned long long *bus)
 166 {
 167         acpi_status status;
 168         int busnum;
 169
 170         busnum = -1;
 171         status =
 172             acpi_walk_resources(handle, METHOD_NAME__CRS,
 173                                 get_root_bridge_busnr_callback, &busnum);
 174         if (ACPI_FAILURE(status))
 175                 return status;
 176         /* Check if we really get a bus number from _CRS */
 177         if (busnum == -1)
 178                 return AE_ERROR;
 179         *bus = busnum;
 180         return AE_OK;
 181 }
 182
 183 static void acpi_pci_bridge_scan(struct acpi_device *device)
 184 {
 185         int status;
 186         struct acpi_device *child = NULL;
 187
 188         if (device->flags.bus_address)
 189                 if (device->parent && device->parent->ops.bind) {
 190                         status = device->parent->ops.bind(device);
 191                         if (!status) {
 192                                 list_for_each_entry(child, &device->children, node)
 193                                         acpi_pci_bridge_scan(child);
 194                         }
 195                 }
 196 }
 197
 198 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
 199                           0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
 200
 201 static acpi_status acpi_pci_run_osc(acpi_handle handle,
 202                                     const u32 *capbuf, u32 *retval)
 203 {
 204         acpi_status status;
 205         struct acpi_object_list input;
 206         union acpi_object in_params[4];
 207         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 208         union acpi_object *out_obj;
 209         u32 errors;
 210
 211         /* Setting up input parameters */
 212         input.count = 4;
 213         input.pointer = in_params;
 214         in_params[0].type               = ACPI_TYPE_BUFFER;
 215         in_params[0].buffer.length      = 16;
 216         in_params[0].buffer.pointer     = OSC_UUID;
 217         in_params[1].type               = ACPI_TYPE_INTEGER;
 218         in_params[1].integer.value      = 1;
 219         in_params[2].type               = ACPI_TYPE_INTEGER;
 220         in_params[2].integer.value      = 3;
 221         in_params[3].type               = ACPI_TYPE_BUFFER;
 222         in_params[3].buffer.length      = 12;
 223         in_params[3].buffer.pointer     = (u8 *)capbuf;
 224
 225         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 226         if (ACPI_FAILURE(status))
 227                 return status;
 228
 229         if (!output.length)
 230                 return AE_NULL_OBJECT;
 231
 232         out_obj = output.pointer;
 233         if (out_obj->type != ACPI_TYPE_BUFFER) {
 234                 printk(KERN_DEBUG "_OSC evaluation returned wrong type\n");
 235                 status = AE_TYPE;
 236                 goto out_kfree;
 237         }
 238         /* Need to ignore the bit0 in result code */
 239         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 240         if (errors) {
 241                 if (errors & OSC_REQUEST_ERROR)
 242                         printk(KERN_DEBUG "_OSC request failed\n");
 243                 if (errors & OSC_INVALID_UUID_ERROR)
 244                         printk(KERN_DEBUG "_OSC invalid UUID\n");
 245                 if (errors & OSC_INVALID_REVISION_ERROR)
 246                         printk(KERN_DEBUG "_OSC invalid revision\n");
 247                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 248                         if (capbuf[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE)
 249                                 goto out_success;
 250                         printk(KERN_DEBUG
 251                                "Firmware did not grant requested _OSC control\n");
 252                         status = AE_SUPPORT;
 253                         goto out_kfree;
 254                 }
 255                 status = AE_ERROR;
 256                 goto out_kfree;
 257         }
 258 out_success:
 259         *retval = *((u32 *)(out_obj->buffer.pointer + 8));
 260         status = AE_OK;
 261
 262 out_kfree:
 263         kfree(output.pointer);
 264         return status;
 265 }
 266
 267 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
 268 {
 269         acpi_status status;
 270         u32 support_set, result, capbuf[3];
 271
 272         /* do _OSC query for all possible controls */
 273         support_set = root->osc_support_set | (flags & OSC_SUPPORT_MASKS);
 274         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 275         capbuf[OSC_SUPPORT_TYPE] = support_set;
 276         capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
 277
 278         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
 279         if (ACPI_SUCCESS(status)) {
 280                 root->osc_support_set = support_set;
 281                 root->osc_control_qry = result;
 282                 root->osc_queried = 1;
 283         }
 284         return status;
 285 }
 286
 287 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 288 {
 289         acpi_status status;
 290         acpi_handle tmp;
 291
 292         status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
 293         if (ACPI_FAILURE(status))
 294                 return status;
 295         mutex_lock(&osc_lock);
 296         status = acpi_pci_query_osc(root, flags);
 297         mutex_unlock(&osc_lock);
 298         return status;
 299 }
 300
 301 static struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 302 {
 303         struct acpi_pci_root *root;
 304         list_for_each_entry(root, &acpi_pci_roots, node) {
 305                 if (root->device->handle == handle)
 306                         return root;
 307         }
 308         return NULL;
 309 }
 310
 311 /**
 312  * acpi_pci_osc_control_set - commit requested control to Firmware
 313  * @handle: acpi_handle for the target ACPI object
 314  * @flags: driver's requested control bits
 315  *
 316  * Attempt to take control from Firmware on requested control bits.
 317  **/
 318 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
 319 {
 320         acpi_status status;
 321         u32 control_req, result, capbuf[3];
 322         acpi_handle tmp;
 323         struct acpi_pci_root *root;
 324
 325         status = acpi_get_handle(handle, "_OSC", &tmp);
 326         if (ACPI_FAILURE(status))
 327                 return status;
 328
 329         control_req = (flags & OSC_CONTROL_MASKS);
 330         if (!control_req)
 331                 return AE_TYPE;
 332
 333         root = acpi_pci_find_root(handle);
 334         if (!root)
 335                 return AE_NOT_EXIST;
 336
 337         mutex_lock(&osc_lock);
 338         /* No need to evaluate _OSC if the control was already granted. */
 339         if ((root->osc_control_set & control_req) == control_req)
 340                 goto out;
 341
 342         /* Need to query controls first before requesting them */
 343         if (!root->osc_queried) {
 344                 status = acpi_pci_query_osc(root, root->osc_support_set);
 345                 if (ACPI_FAILURE(status))
 346                         goto out;
 347         }
 348         if ((root->osc_control_qry & control_req) != control_req) {
 349                 printk(KERN_DEBUG
 350                        "Firmware did not grant requested _OSC control\n");
 351                 status = AE_SUPPORT;
 352                 goto out;
 353         }
 354
 355         capbuf[OSC_QUERY_TYPE] = 0;
 356         capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
 357         capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
 358         status = acpi_pci_run_osc(handle, capbuf, &result);
 359         if (ACPI_SUCCESS(status))
 360                 root->osc_control_set = result;
 361 out:
 362         mutex_unlock(&osc_lock);
 363         return status;
 364 }
 365 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 366
 367 static int __devinit acpi_pci_root_add(struct acpi_device *device)
 368 {
 369         unsigned long long segment, bus;
 370         acpi_status status;
 371         int result;
 372         struct acpi_pci_root *root;
 373         acpi_handle handle;
 374         struct acpi_device *child;
 375         u32 flags, base_flags;
 376
 377         segment = 0;
 378         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
 379                                        &segment);
 380         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 381                 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
 382                 return -ENODEV;
 383         }
 384
 385         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
 386         bus = 0;
 387         status = try_get_root_bridge_busnr(device->handle, &bus);
 388         if (ACPI_FAILURE(status)) {
 389                 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,                                               NULL, &bus);
 390                 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 391                         printk(KERN_ERR PREFIX
 392                              "no bus number in _CRS and can't evaluate _BBN\n");
 393                         return -ENODEV;
 394                 }
 395         }
 396
 397         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 398         if (!root)
 399                 return -ENOMEM;
 400
 401         INIT_LIST_HEAD(&root->node);
 402         root->device = device;
 403         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 404         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 405         device->driver_data = root;
 406
 407         device->ops.bind = acpi_pci_bind;
 408
 409         /*
 410          * All supported architectures that use ACPI have support for
 411          * PCI domains, so we indicate this in _OSC support capabilities.
 412          */
 413         flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
 414         acpi_pci_osc_support(root, flags);
 415
 416         /*
 417          * Device & Function
 418          * -----------------
 419          * Obtained from _ADR (which has already been evaluated for us).
 420          */
 421         root->id.segment = segment & 0xFFFF;
 422         root->id.bus = bus & 0xFF;
 423         root->id.device = device->pnp.bus_address >> 16;
 424         root->id.function = device->pnp.bus_address & 0xFFFF;
 425
 426         /*
 427          * TBD: Need PCI interface for enumeration/configuration of roots.
 428          */
 429
 430         /* TBD: Locking */
 431         list_add_tail(&root->node, &acpi_pci_roots);
 432
 433         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
 434                acpi_device_name(device), acpi_device_bid(device),
 435                root->id.segment, root->id.bus);
 436
 437         /*
 438          * Scan the Root Bridge
 439          * --------------------
 440          * Must do this prior to any attempt to bind the root device, as the
 441          * PCI namespace does not get created until this call is made (and
 442          * thus the root bridge's pci_dev does not exist).
 443          */
 444         root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
 445         if (!root->bus) {
 446                 printk(KERN_ERR PREFIX
 447                             "Bus %04x:%02x not present in PCI namespace\n",
 448                             root->id.segment, root->id.bus);
 449                 result = -ENODEV;
 450                 goto end;
 451         }
 452
 453         /*
 454          * Attach ACPI-PCI Context
 455          * -----------------------
 456          * Thus binding the ACPI and PCI devices.
 457          */
 458         result = acpi_pci_bind_root(device, &root->id, root->bus);
 459         if (result)
 460                 goto end;
 461
 462         /*
 463          * PCI Routing Table
 464          * -----------------
 465          * Evaluate and parse _PRT, if exists.
 466          */
 467         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 468         if (ACPI_SUCCESS(status))
 469                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
 470                                               root->id.bus);
 471
 472         /*
 473          * Scan and bind all _ADR-Based Devices
 474          */
 475         list_for_each_entry(child, &device->children, node)
 476                 acpi_pci_bridge_scan(child);
 477
 478         /* Indicate support for various _OSC capabilities. */
 479         if (pci_ext_cfg_avail(root->bus->self))
 480                 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
 481         if (pcie_aspm_enabled())
 482                 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
 483                         OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
 484         if (pci_msi_enabled())
 485                 flags |= OSC_MSI_SUPPORT;
 486         if (flags != base_flags)
 487                 acpi_pci_osc_support(root, flags);
 488
 489         return 0;
 490
 491 end:
 492         if (!list_empty(&root->node))
 493                 list_del(&root->node);
 494         kfree(root);
 495         return result;
 496 }
 497
 498 static int acpi_pci_root_start(struct acpi_device *device)
 499 {
 500         struct acpi_pci_root *root;
 501
 502
 503         list_for_each_entry(root, &acpi_pci_roots, node) {
 504                 if (root->device == device) {
 505                         pci_bus_add_devices(root->bus);
 506                         return 0;
 507                 }
 508         }
 509         return -ENODEV;
 510 }
 511
 512 static int acpi_pci_root_remove(struct acpi_device *device, int type)
 513 {
 514         struct acpi_pci_root *root = NULL;
 515
 516
 517         if (!device || !acpi_driver_data(device))
 518                 return -EINVAL;
 519
 520         root = acpi_driver_data(device);
 521
 522         kfree(root);
 523
 524         return 0;
 525 }
 526
 527 static int __init acpi_pci_root_init(void)
 528 {
 529         if (acpi_pci_disabled)
 530                 return 0;
 531
 532         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 533                 return -ENODEV;
 534
 535         return 0;
 536 }
 537
 538 subsys_initcall(acpi_pci_root_init);