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