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