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 acpi_handle handle; 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->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 continue; 103 *pptr = (*pptr)->next; 104 break; 105 } 106 107 if (!driver->remove) 108 return; 109 110 list_for_each(entry, &acpi_pci_roots) { 111 struct acpi_pci_root *root; 112 root = list_entry(entry, struct acpi_pci_root, node); 113 driver->remove(root->handle); 114 } 115 } 116 117 EXPORT_SYMBOL(acpi_pci_unregister_driver); 118 119 static acpi_status 120 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 121 { 122 int *busnr = (int *)data; 123 struct acpi_resource_address64 address; 124 125 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && 126 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && 127 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) 128 return AE_OK; 129 130 acpi_resource_to_address64(resource, &address); 131 if ((address.address_length > 0) && 132 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) 133 *busnr = address.minimum; 134 135 return AE_OK; 136 } 137 138 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum) 139 { 140 acpi_status status; 141 142 *busnum = -1; 143 status = 144 acpi_walk_resources(handle, METHOD_NAME__CRS, 145 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 acpi_pci_root_add(struct acpi_device *device) 155 { 156 int result = 0; 157 struct acpi_pci_root *root = NULL; 158 struct acpi_pci_root *tmp; 159 acpi_status status = AE_OK; 160 unsigned long value = 0; 161 acpi_handle handle = NULL; 162 163 ACPI_FUNCTION_TRACE("acpi_pci_root_add"); 164 165 if (!device) 166 return_VALUE(-EINVAL); 167 168 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 169 if (!root) 170 return_VALUE(-ENOMEM); 171 memset(root, 0, sizeof(struct acpi_pci_root)); 172 INIT_LIST_HEAD(&root->node); 173 174 root->handle = device->handle; 175 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 176 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 177 acpi_driver_data(device) = root; 178 179 /* 180 * TBD: Doesn't the bus driver automatically set this? 181 */ 182 device->ops.bind = acpi_pci_bind; 183 184 /* 185 * Segment 186 * ------- 187 * Obtained via _SEG, if exists, otherwise assumed to be zero (0). 188 */ 189 status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL, 190 &value); 191 switch (status) { 192 case AE_OK: 193 root->id.segment = (u16) value; 194 break; 195 case AE_NOT_FOUND: 196 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 197 "Assuming segment 0 (no _SEG)\n")); 198 root->id.segment = 0; 199 break; 200 default: 201 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n")); 202 result = -ENODEV; 203 goto end; 204 } 205 206 /* 207 * Bus 208 * --- 209 * Obtained via _BBN, if exists, otherwise assumed to be zero (0). 210 */ 211 status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL, 212 &value); 213 switch (status) { 214 case AE_OK: 215 root->id.bus = (u16) value; 216 break; 217 case AE_NOT_FOUND: 218 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n")); 219 root->id.bus = 0; 220 break; 221 default: 222 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n")); 223 result = -ENODEV; 224 goto end; 225 } 226 227 /* Some systems have wrong _BBN */ 228 list_for_each_entry(tmp, &acpi_pci_roots, node) { 229 if ((tmp->id.segment == root->id.segment) 230 && (tmp->id.bus == root->id.bus)) { 231 int bus = 0; 232 acpi_status status; 233 234 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 235 "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n")); 236 237 status = try_get_root_bridge_busnr(root->handle, &bus); 238 if (ACPI_FAILURE(status)) 239 break; 240 if (bus != root->id.bus) { 241 printk(KERN_INFO PREFIX 242 "PCI _CRS %d overrides _BBN 0\n", bus); 243 root->id.bus = bus; 244 } 245 break; 246 } 247 } 248 /* 249 * Device & Function 250 * ----------------- 251 * Obtained from _ADR (which has already been evaluated for us). 252 */ 253 root->id.device = device->pnp.bus_address >> 16; 254 root->id.function = device->pnp.bus_address & 0xFFFF; 255 256 /* 257 * TBD: Need PCI interface for enumeration/configuration of roots. 258 */ 259 260 /* TBD: Locking */ 261 list_add_tail(&root->node, &acpi_pci_roots); 262 263 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", 264 acpi_device_name(device), acpi_device_bid(device), 265 root->id.segment, root->id.bus); 266 267 /* 268 * Scan the Root Bridge 269 * -------------------- 270 * Must do this prior to any attempt to bind the root device, as the 271 * PCI namespace does not get created until this call is made (and 272 * thus the root bridge's pci_dev does not exist). 273 */ 274 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); 275 if (!root->bus) { 276 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 277 "Bus %04x:%02x not present in PCI namespace\n", 278 root->id.segment, root->id.bus)); 279 result = -ENODEV; 280 goto end; 281 } 282 283 /* 284 * Attach ACPI-PCI Context 285 * ----------------------- 286 * Thus binding the ACPI and PCI devices. 287 */ 288 result = acpi_pci_bind_root(device, &root->id, root->bus); 289 if (result) 290 goto end; 291 292 /* 293 * PCI Routing Table 294 * ----------------- 295 * Evaluate and parse _PRT, if exists. 296 */ 297 status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle); 298 if (ACPI_SUCCESS(status)) 299 result = acpi_pci_irq_add_prt(root->handle, root->id.segment, 300 root->id.bus); 301 302 end: 303 if (result) { 304 if (!list_empty(&root->node)) 305 list_del(&root->node); 306 kfree(root); 307 } 308 309 return_VALUE(result); 310 } 311 312 static int acpi_pci_root_start(struct acpi_device *device) 313 { 314 struct acpi_pci_root *root; 315 316 ACPI_FUNCTION_TRACE("acpi_pci_root_start"); 317 318 list_for_each_entry(root, &acpi_pci_roots, node) { 319 if (root->handle == device->handle) { 320 pci_bus_add_devices(root->bus); 321 return_VALUE(0); 322 } 323 } 324 return_VALUE(-ENODEV); 325 } 326 327 static int acpi_pci_root_remove(struct acpi_device *device, int type) 328 { 329 struct acpi_pci_root *root = NULL; 330 331 ACPI_FUNCTION_TRACE("acpi_pci_root_remove"); 332 333 if (!device || !acpi_driver_data(device)) 334 return_VALUE(-EINVAL); 335 336 root = (struct acpi_pci_root *)acpi_driver_data(device); 337 338 kfree(root); 339 340 return_VALUE(0); 341 } 342 343 static int __init acpi_pci_root_init(void) 344 { 345 ACPI_FUNCTION_TRACE("acpi_pci_root_init"); 346 347 if (acpi_pci_disabled) 348 return_VALUE(0); 349 350 /* DEBUG: 351 acpi_dbg_layer = ACPI_PCI_COMPONENT; 352 acpi_dbg_level = 0xFFFFFFFF; 353 */ 354 355 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 356 return_VALUE(-ENODEV); 357 358 return_VALUE(0); 359 } 360 361 subsys_initcall(acpi_pci_root_init); 362