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 39 #define _COMPONENT ACPI_PCI_COMPONENT 40 ACPI_MODULE_NAME ("pci_root") 41 42 #define ACPI_PCI_ROOT_CLASS "pci_bridge" 43 #define ACPI_PCI_ROOT_HID "PNP0A03" 44 #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver" 45 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 46 47 static int acpi_pci_root_add (struct acpi_device *device); 48 static int acpi_pci_root_remove (struct acpi_device *device, int type); 49 static int acpi_pci_root_start (struct acpi_device *device); 50 51 static struct acpi_driver acpi_pci_root_driver = { 52 .name = ACPI_PCI_ROOT_DRIVER_NAME, 53 .class = ACPI_PCI_ROOT_CLASS, 54 .ids = ACPI_PCI_ROOT_HID, 55 .ops = { 56 .add = acpi_pci_root_add, 57 .remove = acpi_pci_root_remove, 58 .start = acpi_pci_root_start, 59 }, 60 }; 61 62 struct acpi_pci_root { 63 struct list_head node; 64 acpi_handle handle; 65 struct acpi_pci_id id; 66 struct pci_bus *bus; 67 }; 68 69 static LIST_HEAD(acpi_pci_roots); 70 71 static struct acpi_pci_driver *sub_driver; 72 73 int acpi_pci_register_driver(struct acpi_pci_driver *driver) 74 { 75 int n = 0; 76 struct list_head *entry; 77 78 struct acpi_pci_driver **pptr = &sub_driver; 79 while (*pptr) 80 pptr = &(*pptr)->next; 81 *pptr = driver; 82 83 if (!driver->add) 84 return 0; 85 86 list_for_each(entry, &acpi_pci_roots) { 87 struct acpi_pci_root *root; 88 root = list_entry(entry, struct acpi_pci_root, node); 89 driver->add(root->handle); 90 n++; 91 } 92 93 return n; 94 } 95 EXPORT_SYMBOL(acpi_pci_register_driver); 96 97 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) 98 { 99 struct list_head *entry; 100 101 struct acpi_pci_driver **pptr = &sub_driver; 102 while (*pptr) { 103 if (*pptr != driver) 104 continue; 105 *pptr = (*pptr)->next; 106 break; 107 } 108 109 if (!driver->remove) 110 return; 111 112 list_for_each(entry, &acpi_pci_roots) { 113 struct acpi_pci_root *root; 114 root = list_entry(entry, struct acpi_pci_root, node); 115 driver->remove(root->handle); 116 } 117 } 118 EXPORT_SYMBOL(acpi_pci_unregister_driver); 119 120 static acpi_status 121 get_root_bridge_busnr_callback (struct acpi_resource *resource, void *data) 122 { 123 int *busnr = (int *)data; 124 struct acpi_resource_address64 address; 125 126 if (resource->id != ACPI_RSTYPE_ADDRESS16 && 127 resource->id != ACPI_RSTYPE_ADDRESS32 && 128 resource->id != ACPI_RSTYPE_ADDRESS64) 129 return AE_OK; 130 131 acpi_resource_to_address64(resource, &address); 132 if ((address.address_length > 0) && 133 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) 134 *busnr = address.min_address_range; 135 136 return AE_OK; 137 } 138 139 static acpi_status 140 try_get_root_bridge_busnr(acpi_handle handle, int *busnum) 141 { 142 acpi_status status; 143 144 *busnum = -1; 145 status = acpi_walk_resources(handle, METHOD_NAME__CRS, get_root_bridge_busnr_callback, busnum); 146 if (ACPI_FAILURE(status)) 147 return status; 148 /* Check if we really get a bus number from _CRS */ 149 if (*busnum == -1) 150 return AE_ERROR; 151 return AE_OK; 152 } 153 154 static int 155 acpi_pci_root_add ( 156 struct acpi_device *device) 157 { 158 int result = 0; 159 struct acpi_pci_root *root = NULL; 160 struct acpi_pci_root *tmp; 161 acpi_status status = AE_OK; 162 unsigned long value = 0; 163 acpi_handle handle = NULL; 164 165 ACPI_FUNCTION_TRACE("acpi_pci_root_add"); 166 167 if (!device) 168 return_VALUE(-EINVAL); 169 170 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 171 if (!root) 172 return_VALUE(-ENOMEM); 173 memset(root, 0, sizeof(struct acpi_pci_root)); 174 INIT_LIST_HEAD(&root->node); 175 176 root->handle = device->handle; 177 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 178 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 179 acpi_driver_data(device) = root; 180 181 /* 182 * TBD: Doesn't the bus driver automatically set this? 183 */ 184 device->ops.bind = acpi_pci_bind; 185 186 /* 187 * Segment 188 * ------- 189 * Obtained via _SEG, if exists, otherwise assumed to be zero (0). 190 */ 191 status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL, 192 &value); 193 switch (status) { 194 case AE_OK: 195 root->id.segment = (u16) value; 196 break; 197 case AE_NOT_FOUND: 198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 199 "Assuming segment 0 (no _SEG)\n")); 200 root->id.segment = 0; 201 break; 202 default: 203 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n")); 204 result = -ENODEV; 205 goto end; 206 } 207 208 /* 209 * Bus 210 * --- 211 * Obtained via _BBN, if exists, otherwise assumed to be zero (0). 212 */ 213 status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL, 214 &value); 215 switch (status) { 216 case AE_OK: 217 root->id.bus = (u16) value; 218 break; 219 case AE_NOT_FOUND: 220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n")); 221 root->id.bus = 0; 222 break; 223 default: 224 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n")); 225 result = -ENODEV; 226 goto end; 227 } 228 229 /* Some systems have wrong _BBN */ 230 list_for_each_entry(tmp, &acpi_pci_roots, node) { 231 if ((tmp->id.segment == root->id.segment) 232 && (tmp->id.bus == root->id.bus)) { 233 int bus = 0; 234 acpi_status status; 235 236 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 237 "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n")); 238 239 status = try_get_root_bridge_busnr(root->handle, &bus); 240 if (ACPI_FAILURE(status)) 241 break; 242 if (bus != root->id.bus) { 243 printk(KERN_INFO PREFIX "PCI _CRS %d overrides _BBN 0\n", bus); 244 root->id.bus = bus; 245 } 246 break; 247 } 248 } 249 /* 250 * Device & Function 251 * ----------------- 252 * Obtained from _ADR (which has already been evaluated for us). 253 */ 254 root->id.device = device->pnp.bus_address >> 16; 255 root->id.function = device->pnp.bus_address & 0xFFFF; 256 257 /* 258 * TBD: Need PCI interface for enumeration/configuration of roots. 259 */ 260 261 /* TBD: Locking */ 262 list_add_tail(&root->node, &acpi_pci_roots); 263 264 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", 265 acpi_device_name(device), acpi_device_bid(device), 266 root->id.segment, root->id.bus); 267 268 /* 269 * Scan the Root Bridge 270 * -------------------- 271 * Must do this prior to any attempt to bind the root device, as the 272 * PCI namespace does not get created until this call is made (and 273 * thus the root bridge's pci_dev does not exist). 274 */ 275 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); 276 if (!root->bus) { 277 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 278 "Bus %04x:%02x not present in PCI namespace\n", 279 root->id.segment, root->id.bus)); 280 result = -ENODEV; 281 goto end; 282 } 283 284 /* 285 * Attach ACPI-PCI Context 286 * ----------------------- 287 * Thus binding the ACPI and PCI devices. 288 */ 289 result = acpi_pci_bind_root(device, &root->id, root->bus); 290 if (result) 291 goto end; 292 293 /* 294 * PCI Routing Table 295 * ----------------- 296 * Evaluate and parse _PRT, if exists. 297 */ 298 status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle); 299 if (ACPI_SUCCESS(status)) 300 result = acpi_pci_irq_add_prt(root->handle, root->id.segment, 301 root->id.bus); 302 303 end: 304 if (result) { 305 if (!list_empty(&root->node)) 306 list_del(&root->node); 307 kfree(root); 308 } 309 310 return_VALUE(result); 311 } 312 313 static int 314 acpi_pci_root_start ( 315 struct acpi_device *device) 316 { 317 struct acpi_pci_root *root; 318 319 ACPI_FUNCTION_TRACE("acpi_pci_root_start"); 320 321 list_for_each_entry(root, &acpi_pci_roots, node) { 322 if (root->handle == device->handle) { 323 pci_bus_add_devices(root->bus); 324 return_VALUE(0); 325 } 326 } 327 return_VALUE(-ENODEV); 328 } 329 330 static int 331 acpi_pci_root_remove ( 332 struct acpi_device *device, 333 int type) 334 { 335 struct acpi_pci_root *root = NULL; 336 337 ACPI_FUNCTION_TRACE("acpi_pci_root_remove"); 338 339 if (!device || !acpi_driver_data(device)) 340 return_VALUE(-EINVAL); 341 342 root = (struct acpi_pci_root *) acpi_driver_data(device); 343 344 kfree(root); 345 346 return_VALUE(0); 347 } 348 349 350 static int __init acpi_pci_root_init (void) 351 { 352 ACPI_FUNCTION_TRACE("acpi_pci_root_init"); 353 354 if (acpi_pci_disabled) 355 return_VALUE(0); 356 357 /* DEBUG: 358 acpi_dbg_layer = ACPI_PCI_COMPONENT; 359 acpi_dbg_level = 0xFFFFFFFF; 360 */ 361 362 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 363 return_VALUE(-ENODEV); 364 365 return_VALUE(0); 366 } 367 368 subsys_initcall(acpi_pci_root_init); 369 370