1 /* 2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. 3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> 4 * 5 * All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or (at 10 * your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 15 * NON INFRINGEMENT. See the GNU General Public License for more 16 * details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * Send feedback to <lxie@us.ibm.com> 23 * 24 */ 25 #include <linux/pci.h> 26 #include <asm/pci-bridge.h> 27 #include <asm/rtas.h> 28 #include <asm/machdep.h> 29 #include "../pci.h" /* for pci_add_new_bus */ 30 31 #include "rpaphp.h" 32 33 struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn) 34 { 35 struct pci_dev *dev = NULL; 36 char bus_id[BUS_ID_SIZE]; 37 38 sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number, 39 dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn)); 40 for_each_pci_dev(dev) { 41 if (!strcmp(pci_name(dev), bus_id)) { 42 break; 43 } 44 } 45 return dev; 46 } 47 48 EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev); 49 50 int rpaphp_claim_resource(struct pci_dev *dev, int resource) 51 { 52 struct resource *res = &dev->resource[resource]; 53 struct resource *root = pci_find_parent_resource(dev, res); 54 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 55 int err = -EINVAL; 56 57 if (root != NULL) { 58 err = request_resource(root, res); 59 } 60 61 if (err) { 62 err("PCI: %s region %d of %s %s [%lx:%lx]\n", 63 root ? "Address space collision on" : 64 "No parent found for", 65 resource, dtype, pci_name(dev), res->start, res->end); 66 } 67 return err; 68 } 69 70 EXPORT_SYMBOL_GPL(rpaphp_claim_resource); 71 72 static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot) 73 { 74 return rpaphp_find_pci_dev(slot->dn); 75 } 76 77 static int rpaphp_get_sensor_state(struct slot *slot, int *state) 78 { 79 int rc; 80 int setlevel; 81 82 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); 83 84 if (rc < 0) { 85 if (rc == -EFAULT || rc == -EEXIST) { 86 dbg("%s: slot must be power up to get sensor-state\n", 87 __FUNCTION__); 88 89 /* some slots have to be powered up 90 * before get-sensor will succeed. 91 */ 92 rc = rtas_set_power_level(slot->power_domain, POWER_ON, 93 &setlevel); 94 if (rc < 0) { 95 dbg("%s: power on slot[%s] failed rc=%d.\n", 96 __FUNCTION__, slot->name, rc); 97 } else { 98 rc = rtas_get_sensor(DR_ENTITY_SENSE, 99 slot->index, state); 100 } 101 } else if (rc == -ENODEV) 102 info("%s: slot is unusable\n", __FUNCTION__); 103 else 104 err("%s failed to get sensor state\n", __FUNCTION__); 105 } 106 return rc; 107 } 108 109 /** 110 * get_pci_adapter_status - get the status of a slot 111 * 112 * 0-- slot is empty 113 * 1-- adapter is configured 114 * 2-- adapter is not configured 115 * 3-- not valid 116 */ 117 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value) 118 { 119 int state, rc; 120 struct device_node *child_dn; 121 struct pci_dev *child_dev = NULL; 122 123 *value = NOT_VALID; 124 rc = rpaphp_get_sensor_state(slot, &state); 125 if (rc) 126 goto exit; 127 128 if ((state == EMPTY) || (slot->type == PHB)) { 129 dbg("slot is empty\n"); 130 *value = EMPTY; 131 } 132 else if (state == PRESENT) { 133 if (!is_init) { 134 /* at run-time slot->state can be changed by */ 135 /* config/unconfig adapter */ 136 *value = slot->state; 137 } else { 138 child_dn = slot->dn->child; 139 if (child_dn) 140 child_dev = rpaphp_find_pci_dev(child_dn); 141 142 if (child_dev) 143 *value = CONFIGURED; 144 else if (!child_dn) 145 dbg("%s: %s is not valid OFDT node\n", 146 __FUNCTION__, slot->dn->full_name); 147 else { 148 err("%s: can't find pdev of adapter in slot[%s]\n", 149 __FUNCTION__, slot->dn->full_name); 150 *value = NOT_CONFIGURED; 151 } 152 } 153 } 154 exit: 155 return rc; 156 } 157 158 /* Must be called before pci_bus_add_devices */ 159 static void 160 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) 161 { 162 struct pci_dev *dev; 163 164 list_for_each_entry(dev, &bus->devices, bus_list) { 165 /* 166 * Skip already-present devices (which are on the 167 * global device list.) 168 */ 169 if (list_empty(&dev->global_list)) { 170 int i; 171 172 /* Need to setup IOMMU tables */ 173 ppc_md.iommu_dev_setup(dev); 174 175 if(fix_bus) 176 pcibios_fixup_device_resources(dev, bus); 177 pci_read_irq_line(dev); 178 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 179 struct resource *r = &dev->resource[i]; 180 181 if (r->parent || !r->start || !r->flags) 182 continue; 183 rpaphp_claim_resource(dev, i); 184 } 185 } 186 } 187 } 188 189 static int rpaphp_pci_config_bridge(struct pci_dev *dev); 190 191 /***************************************************************************** 192 rpaphp_pci_config_slot() will configure all devices under the 193 given slot->dn and return the the first pci_dev. 194 *****************************************************************************/ 195 static struct pci_dev * 196 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus) 197 { 198 struct device_node *eads_first_child = dn->child; 199 struct pci_dev *dev = NULL; 200 int num; 201 202 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name); 203 204 if (eads_first_child) { 205 /* pci_scan_slot should find all children of EADs */ 206 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0)); 207 if (num) { 208 rpaphp_fixup_new_pci_devices(bus, 1); 209 pci_bus_add_devices(bus); 210 } 211 dev = rpaphp_find_pci_dev(eads_first_child); 212 if (!dev) { 213 err("No new device found\n"); 214 return NULL; 215 } 216 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) 217 rpaphp_pci_config_bridge(dev); 218 } 219 return dev; 220 } 221 222 static int rpaphp_pci_config_bridge(struct pci_dev *dev) 223 { 224 u8 sec_busno; 225 struct pci_bus *child_bus; 226 struct pci_dev *child_dev; 227 228 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev)); 229 230 /* get busno of downstream bus */ 231 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); 232 233 /* add to children of PCI bridge dev->bus */ 234 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); 235 if (!child_bus) { 236 err("%s: could not add second bus\n", __FUNCTION__); 237 return -EIO; 238 } 239 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); 240 /* do pci_scan_child_bus */ 241 pci_scan_child_bus(child_bus); 242 243 list_for_each_entry(child_dev, &child_bus->devices, bus_list) { 244 eeh_add_device_late(child_dev); 245 } 246 247 /* fixup new pci devices without touching bus struct */ 248 rpaphp_fixup_new_pci_devices(child_bus, 0); 249 250 /* Make the discovered devices available */ 251 pci_bus_add_devices(child_bus); 252 return 0; 253 } 254 255 static void enable_eeh(struct device_node *dn) 256 { 257 struct device_node *sib; 258 259 for (sib = dn->child; sib; sib = sib->sibling) 260 enable_eeh(sib); 261 eeh_add_device_early(dn); 262 return; 263 264 } 265 266 static void print_slot_pci_funcs(struct slot *slot) 267 { 268 struct pci_dev *dev; 269 270 if (slot->dev_type == PCI_DEV) { 271 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name); 272 list_for_each_entry (dev, slot->dev.pci_devs, bus_list) 273 dbg("\t%s\n", pci_name(dev)); 274 } 275 return; 276 } 277 278 static int rpaphp_config_pci_adapter(struct slot *slot) 279 { 280 struct pci_bus *pci_bus; 281 struct pci_dev *dev; 282 int rc = -ENODEV; 283 284 dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name); 285 286 if (slot->bridge) { 287 288 pci_bus = slot->bridge->subordinate; 289 if (!pci_bus) { 290 err("%s: can't find bus structure\n", __FUNCTION__); 291 goto exit; 292 } 293 enable_eeh(slot->dn); 294 dev = rpaphp_pci_config_slot(slot->dn, pci_bus); 295 if (!dev) { 296 err("%s: can't find any devices.\n", __FUNCTION__); 297 goto exit; 298 } 299 print_slot_pci_funcs(slot); 300 rc = 0; 301 } else { 302 /* slot is not enabled */ 303 err("slot doesn't have pci_dev structure\n"); 304 } 305 exit: 306 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc); 307 return rc; 308 } 309 310 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev) 311 { 312 eeh_remove_device(dev); 313 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 314 struct pci_bus *bus = dev->subordinate; 315 struct list_head *ln; 316 if (!bus) 317 return; 318 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { 319 struct pci_dev *pdev = pci_dev_b(ln); 320 if (pdev) 321 rpaphp_eeh_remove_bus_device(pdev); 322 } 323 324 } 325 return; 326 } 327 328 int rpaphp_unconfig_pci_adapter(struct slot *slot) 329 { 330 struct pci_dev *dev; 331 int retval = 0; 332 333 list_for_each_entry(dev, slot->dev.pci_devs, bus_list) 334 rpaphp_eeh_remove_bus_device(dev); 335 336 pci_remove_behind_bridge(slot->bridge); 337 slot->state = NOT_CONFIGURED; 338 info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__, 339 slot->name); 340 return retval; 341 } 342 343 static int setup_pci_hotplug_slot_info(struct slot *slot) 344 { 345 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", 346 __FUNCTION__); 347 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status); 348 rpaphp_get_pci_adapter_status(slot, 1, 349 &slot->hotplug_slot->info-> 350 adapter_status); 351 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) { 352 err("%s: NOT_VALID: skip dn->full_name=%s\n", 353 __FUNCTION__, slot->dn->full_name); 354 return -EINVAL; 355 } 356 return 0; 357 } 358 359 static int set_phb_slot_name(struct slot *slot) 360 { 361 struct device_node *dn; 362 struct pci_controller *phb; 363 struct pci_bus *bus; 364 365 dn = slot->dn; 366 if (!dn) { 367 return -EINVAL; 368 } 369 phb = dn->phb; 370 if (!phb) { 371 return -EINVAL; 372 } 373 bus = phb->bus; 374 if (!bus) { 375 return -EINVAL; 376 } 377 378 sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus), 379 bus->number, 0, 0); 380 return 0; 381 } 382 383 static int setup_pci_slot(struct slot *slot) 384 { 385 struct pci_bus *bus; 386 int rc; 387 388 if (slot->type == PHB) { 389 rc = set_phb_slot_name(slot); 390 if (rc < 0) { 391 err("%s: failed to set phb slot name\n", __FUNCTION__); 392 goto exit_rc; 393 } 394 } else { 395 slot->bridge = rpaphp_find_bridge_pdev(slot); 396 if (!slot->bridge) { 397 /* slot being added doesn't have pci_dev yet */ 398 err("%s: no pci_dev for bridge dn %s\n", 399 __FUNCTION__, slot->name); 400 goto exit_rc; 401 } 402 403 bus = slot->bridge->subordinate; 404 if (!bus) 405 goto exit_rc; 406 slot->dev.pci_devs = &bus->devices; 407 408 dbg("%s set slot->name to %s\n", __FUNCTION__, 409 pci_name(slot->bridge)); 410 strcpy(slot->name, pci_name(slot->bridge)); 411 } 412 413 /* find slot's pci_dev if it's not empty */ 414 if (slot->hotplug_slot->info->adapter_status == EMPTY) { 415 slot->state = EMPTY; /* slot is empty */ 416 } else { 417 /* slot is occupied */ 418 if (!(slot->dn->child)) { 419 /* non-empty slot has to have child */ 420 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 421 __FUNCTION__, slot->name); 422 goto exit_rc; 423 } 424 425 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { 426 dbg("%s CONFIGURING pci adapter in slot[%s]\n", 427 __FUNCTION__, slot->name); 428 if (rpaphp_config_pci_adapter(slot)) { 429 err("%s: CONFIG pci adapter failed\n", __FUNCTION__); 430 goto exit_rc; 431 } 432 433 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { 434 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", 435 __FUNCTION__, slot->name); 436 goto exit_rc; 437 } 438 print_slot_pci_funcs(slot); 439 if (!list_empty(slot->dev.pci_devs)) { 440 slot->state = CONFIGURED; 441 } else { 442 /* DLPAR add as opposed to 443 * boot time */ 444 slot->state = NOT_CONFIGURED; 445 } 446 } 447 return 0; 448 exit_rc: 449 dealloc_slot_struct(slot); 450 return -EINVAL; 451 } 452 453 int register_pci_slot(struct slot *slot) 454 { 455 int rc = -EINVAL; 456 457 slot->dev_type = PCI_DEV; 458 if ((slot->type == EMBEDDED) || (slot->type == PHB)) 459 slot->removable = 0; 460 else 461 slot->removable = 1; 462 if (setup_pci_hotplug_slot_info(slot)) 463 goto exit_rc; 464 if (setup_pci_slot(slot)) 465 goto exit_rc; 466 rc = register_slot(slot); 467 exit_rc: 468 return rc; 469 } 470 471 int rpaphp_enable_pci_slot(struct slot *slot) 472 { 473 int retval = 0, state; 474 475 retval = rpaphp_get_sensor_state(slot, &state); 476 if (retval) 477 goto exit; 478 dbg("%s: sensor state[%d]\n", __FUNCTION__, state); 479 /* if slot is not empty, enable the adapter */ 480 if (state == PRESENT) { 481 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); 482 retval = rpaphp_config_pci_adapter(slot); 483 if (!retval) { 484 slot->state = CONFIGURED; 485 dbg("%s: PCI devices in slot[%s] has been configured\n", 486 __FUNCTION__, slot->name); 487 } else { 488 slot->state = NOT_CONFIGURED; 489 dbg("%s: no pci_dev struct for adapter in slot[%s]\n", 490 __FUNCTION__, slot->name); 491 } 492 } else if (state == EMPTY) { 493 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); 494 slot->state = EMPTY; 495 } else { 496 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, 497 slot->name); 498 slot->state = NOT_VALID; 499 retval = -EINVAL; 500 } 501 exit: 502 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 503 return retval; 504 } 505 506 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev) 507 { 508 struct list_head *tmp, *n; 509 struct slot *slot; 510 511 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 512 struct pci_bus *bus; 513 struct list_head *ln; 514 515 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 516 if (slot->bridge == NULL) { 517 if (slot->dev_type == PCI_DEV) { 518 printk(KERN_WARNING "PCI slot missing bridge %s %s \n", 519 slot->name, slot->location); 520 } 521 continue; 522 } 523 524 bus = slot->bridge->subordinate; 525 if (!bus) { 526 continue; /* should never happen? */ 527 } 528 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { 529 struct pci_dev *pdev = pci_dev_b(ln); 530 if (pdev == dev) 531 return slot->hotplug_slot; 532 } 533 } 534 535 return NULL; 536 } 537 538 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot); 539