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/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_root") 40 #define ACPI_PCI_ROOT_CLASS "pci_bridge" 41 #define ACPI_PCI_ROOT_HID "PNP0A03" 42 #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver" 43 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 44 static int acpi_pci_root_add(struct acpi_device *device); 45 static int acpi_pci_root_remove(struct acpi_device *device, int type); 46 static int acpi_pci_root_start(struct acpi_device *device); 47 48 static struct acpi_driver acpi_pci_root_driver = { 49 .name = ACPI_PCI_ROOT_DRIVER_NAME, 50 .class = ACPI_PCI_ROOT_CLASS, 51 .ids = ACPI_PCI_ROOT_HID, 52 .ops = { 53 .add = acpi_pci_root_add, 54 .remove = acpi_pci_root_remove, 55 .start = acpi_pci_root_start, 56 }, 57 }; 58 59 struct acpi_pci_root { 60 struct list_head node; 61 struct acpi_device * device; 62 struct acpi_pci_id id; 63 struct pci_bus *bus; 64 }; 65 66 static LIST_HEAD(acpi_pci_roots); 67 68 static struct acpi_pci_driver *sub_driver; 69 70 int acpi_pci_register_driver(struct acpi_pci_driver *driver) 71 { 72 int n = 0; 73 struct list_head *entry; 74 75 struct acpi_pci_driver **pptr = &sub_driver; 76 while (*pptr) 77 pptr = &(*pptr)->next; 78 *pptr = driver; 79 80 if (!driver->add) 81 return 0; 82 83 list_for_each(entry, &acpi_pci_roots) { 84 struct acpi_pci_root *root; 85 root = list_entry(entry, struct acpi_pci_root, node); 86 driver->add(root->device->handle); 87 n++; 88 } 89 90 return n; 91 } 92 93 EXPORT_SYMBOL(acpi_pci_register_driver); 94 95 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) 96 { 97 struct list_head *entry; 98 99 struct acpi_pci_driver **pptr = &sub_driver; 100 while (*pptr) { 101 if (*pptr == driver) 102 break; 103 pptr = &(*pptr)->next; 104 } 105 BUG_ON(!*pptr); 106 *pptr = (*pptr)->next; 107 108 if (!driver->remove) 109 return; 110 111 list_for_each(entry, &acpi_pci_roots) { 112 struct acpi_pci_root *root; 113 root = list_entry(entry, struct acpi_pci_root, node); 114 driver->remove(root->device->handle); 115 } 116 } 117 118 EXPORT_SYMBOL(acpi_pci_unregister_driver); 119 120 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) 121 { 122 struct acpi_pci_root *tmp; 123 124 list_for_each_entry(tmp, &acpi_pci_roots, node) { 125 if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus)) 126 return tmp->device->handle; 127 } 128 return NULL; 129 } 130 131 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); 132 133 static acpi_status 134 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 135 { 136 int *busnr = data; 137 struct acpi_resource_address64 address; 138 139 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && 140 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && 141 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) 142 return AE_OK; 143 144 acpi_resource_to_address64(resource, &address); 145 if ((address.address_length > 0) && 146 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) 147 *busnr = address.minimum; 148 149 return AE_OK; 150 } 151 152 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum) 153 { 154 acpi_status status; 155 156 *busnum = -1; 157 status = 158 acpi_walk_resources(handle, METHOD_NAME__CRS, 159 get_root_bridge_busnr_callback, busnum); 160 if (ACPI_FAILURE(status)) 161 return status; 162 /* Check if we really get a bus number from _CRS */ 163 if (*busnum == -1) 164 return AE_ERROR; 165 return AE_OK; 166 } 167 168 static void acpi_pci_bridge_scan(struct acpi_device *device) 169 { 170 int status; 171 struct acpi_device *child = NULL; 172 173 if (device->flags.bus_address) 174 if (device->parent && device->parent->ops.bind) { 175 status = device->parent->ops.bind(device); 176 if (!status) { 177 list_for_each_entry(child, &device->children, node) 178 acpi_pci_bridge_scan(child); 179 } 180 } 181 } 182 183 static int acpi_pci_root_add(struct acpi_device *device) 184 { 185 int result = 0; 186 struct acpi_pci_root *root = NULL; 187 struct acpi_pci_root *tmp; 188 acpi_status status = AE_OK; 189 unsigned long value = 0; 190 acpi_handle handle = NULL; 191 struct acpi_device *child; 192 193 194 if (!device) 195 return -EINVAL; 196 197 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 198 if (!root) 199 return -ENOMEM; 200 INIT_LIST_HEAD(&root->node); 201 202 root->device = device; 203 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 204 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 205 acpi_driver_data(device) = root; 206 207 device->ops.bind = acpi_pci_bind; 208 209 /* 210 * Segment 211 * ------- 212 * Obtained via _SEG, if exists, otherwise assumed to be zero (0). 213 */ 214 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, 215 &value); 216 switch (status) { 217 case AE_OK: 218 root->id.segment = (u16) value; 219 break; 220 case AE_NOT_FOUND: 221 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 222 "Assuming segment 0 (no _SEG)\n")); 223 root->id.segment = 0; 224 break; 225 default: 226 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG")); 227 result = -ENODEV; 228 goto end; 229 } 230 231 /* 232 * Bus 233 * --- 234 * Obtained via _BBN, if exists, otherwise assumed to be zero (0). 235 */ 236 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, 237 &value); 238 switch (status) { 239 case AE_OK: 240 root->id.bus = (u16) value; 241 break; 242 case AE_NOT_FOUND: 243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n")); 244 root->id.bus = 0; 245 break; 246 default: 247 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN")); 248 result = -ENODEV; 249 goto end; 250 } 251 252 /* Some systems have wrong _BBN */ 253 list_for_each_entry(tmp, &acpi_pci_roots, node) { 254 if ((tmp->id.segment == root->id.segment) 255 && (tmp->id.bus == root->id.bus)) { 256 int bus = 0; 257 acpi_status status; 258 259 printk(KERN_ERR PREFIX 260 "Wrong _BBN value, reboot" 261 " and use option 'pci=noacpi'\n"); 262 263 status = try_get_root_bridge_busnr(device->handle, &bus); 264 if (ACPI_FAILURE(status)) 265 break; 266 if (bus != root->id.bus) { 267 printk(KERN_INFO PREFIX 268 "PCI _CRS %d overrides _BBN 0\n", bus); 269 root->id.bus = bus; 270 } 271 break; 272 } 273 } 274 /* 275 * Device & Function 276 * ----------------- 277 * Obtained from _ADR (which has already been evaluated for us). 278 */ 279 root->id.device = device->pnp.bus_address >> 16; 280 root->id.function = device->pnp.bus_address & 0xFFFF; 281 282 /* 283 * TBD: Need PCI interface for enumeration/configuration of roots. 284 */ 285 286 /* TBD: Locking */ 287 list_add_tail(&root->node, &acpi_pci_roots); 288 289 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", 290 acpi_device_name(device), acpi_device_bid(device), 291 root->id.segment, root->id.bus); 292 293 /* 294 * Scan the Root Bridge 295 * -------------------- 296 * Must do this prior to any attempt to bind the root device, as the 297 * PCI namespace does not get created until this call is made (and 298 * thus the root bridge's pci_dev does not exist). 299 */ 300 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); 301 if (!root->bus) { 302 printk(KERN_ERR PREFIX 303 "Bus %04x:%02x not present in PCI namespace\n", 304 root->id.segment, root->id.bus); 305 result = -ENODEV; 306 goto end; 307 } 308 309 /* 310 * Attach ACPI-PCI Context 311 * ----------------------- 312 * Thus binding the ACPI and PCI devices. 313 */ 314 result = acpi_pci_bind_root(device, &root->id, root->bus); 315 if (result) 316 goto end; 317 318 /* 319 * PCI Routing Table 320 * ----------------- 321 * Evaluate and parse _PRT, if exists. 322 */ 323 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); 324 if (ACPI_SUCCESS(status)) 325 result = acpi_pci_irq_add_prt(device->handle, root->id.segment, 326 root->id.bus); 327 328 /* 329 * Scan and bind all _ADR-Based Devices 330 */ 331 list_for_each_entry(child, &device->children, node) 332 acpi_pci_bridge_scan(child); 333 334 end: 335 if (result) { 336 if (!list_empty(&root->node)) 337 list_del(&root->node); 338 kfree(root); 339 } 340 341 return result; 342 } 343 344 static int acpi_pci_root_start(struct acpi_device *device) 345 { 346 struct acpi_pci_root *root; 347 348 349 list_for_each_entry(root, &acpi_pci_roots, node) { 350 if (root->device == device) { 351 pci_bus_add_devices(root->bus); 352 return 0; 353 } 354 } 355 return -ENODEV; 356 } 357 358 static int acpi_pci_root_remove(struct acpi_device *device, int type) 359 { 360 struct acpi_pci_root *root = NULL; 361 362 363 if (!device || !acpi_driver_data(device)) 364 return -EINVAL; 365 366 root = acpi_driver_data(device); 367 368 kfree(root); 369 370 return 0; 371 } 372 373 static int __init acpi_pci_root_init(void) 374 { 375 376 if (acpi_pci_disabled) 377 return 0; 378 379 /* DEBUG: 380 acpi_dbg_layer = ACPI_PCI_COMPONENT; 381 acpi_dbg_level = 0xFFFFFFFF; 382 */ 383 384 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 385 return -ENODEV; 386 387 return 0; 388 } 389 390 subsys_initcall(acpi_pci_root_init); 391