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