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 static struct pci_bus *find_bus_among_children(struct pci_bus *bus, 34 struct device_node *dn) 35 { 36 struct pci_bus *child = NULL; 37 struct list_head *tmp; 38 struct device_node *busdn; 39 40 busdn = pci_bus_to_OF_node(bus); 41 if (busdn == dn) 42 return bus; 43 44 list_for_each(tmp, &bus->children) { 45 child = find_bus_among_children(pci_bus_b(tmp), dn); 46 if (child) 47 break; 48 } 49 return child; 50 } 51 52 struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn) 53 { 54 struct pci_dn *pdn = dn->data; 55 56 if (!pdn || !pdn->phb || !pdn->phb->bus) 57 return NULL; 58 59 return find_bus_among_children(pdn->phb->bus, dn); 60 } 61 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus); 62 63 int rpaphp_claim_resource(struct pci_dev *dev, int resource) 64 { 65 struct resource *res = &dev->resource[resource]; 66 struct resource *root = pci_find_parent_resource(dev, res); 67 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 68 int err = -EINVAL; 69 70 if (root != NULL) { 71 err = request_resource(root, res); 72 } 73 74 if (err) { 75 err("PCI: %s region %d of %s %s [%lx:%lx]\n", 76 root ? "Address space collision on" : 77 "No parent found for", 78 resource, dtype, pci_name(dev), res->start, res->end); 79 } 80 return err; 81 } 82 83 EXPORT_SYMBOL_GPL(rpaphp_claim_resource); 84 85 static int rpaphp_get_sensor_state(struct slot *slot, int *state) 86 { 87 int rc; 88 int setlevel; 89 90 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); 91 92 if (rc < 0) { 93 if (rc == -EFAULT || rc == -EEXIST) { 94 dbg("%s: slot must be power up to get sensor-state\n", 95 __FUNCTION__); 96 97 /* some slots have to be powered up 98 * before get-sensor will succeed. 99 */ 100 rc = rtas_set_power_level(slot->power_domain, POWER_ON, 101 &setlevel); 102 if (rc < 0) { 103 dbg("%s: power on slot[%s] failed rc=%d.\n", 104 __FUNCTION__, slot->name, rc); 105 } else { 106 rc = rtas_get_sensor(DR_ENTITY_SENSE, 107 slot->index, state); 108 } 109 } else if (rc == -ENODEV) 110 info("%s: slot is unusable\n", __FUNCTION__); 111 else 112 err("%s failed to get sensor state\n", __FUNCTION__); 113 } 114 return rc; 115 } 116 117 /** 118 * get_pci_adapter_status - get the status of a slot 119 * 120 * 0-- slot is empty 121 * 1-- adapter is configured 122 * 2-- adapter is not configured 123 * 3-- not valid 124 */ 125 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value) 126 { 127 struct pci_bus *bus; 128 int state, rc; 129 130 *value = NOT_VALID; 131 rc = rpaphp_get_sensor_state(slot, &state); 132 if (rc) 133 goto exit; 134 135 if (state == EMPTY) 136 *value = EMPTY; 137 else if (state == PRESENT) { 138 if (!is_init) { 139 /* at run-time slot->state can be changed by */ 140 /* config/unconfig adapter */ 141 *value = slot->state; 142 } else { 143 bus = rpaphp_find_pci_bus(slot->dn); 144 if (bus && !list_empty(&bus->devices)) 145 *value = CONFIGURED; 146 else 147 *value = NOT_CONFIGURED; 148 } 149 } 150 exit: 151 return rc; 152 } 153 154 /* Must be called before pci_bus_add_devices */ 155 static void 156 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) 157 { 158 struct pci_dev *dev; 159 160 list_for_each_entry(dev, &bus->devices, bus_list) { 161 /* 162 * Skip already-present devices (which are on the 163 * global device list.) 164 */ 165 if (list_empty(&dev->global_list)) { 166 int i; 167 168 /* Need to setup IOMMU tables */ 169 ppc_md.iommu_dev_setup(dev); 170 171 if(fix_bus) 172 pcibios_fixup_device_resources(dev, bus); 173 pci_read_irq_line(dev); 174 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 175 struct resource *r = &dev->resource[i]; 176 177 if (r->parent || !r->start || !r->flags) 178 continue; 179 rpaphp_claim_resource(dev, i); 180 } 181 } 182 } 183 } 184 185 static int rpaphp_pci_config_bridge(struct pci_dev *dev) 186 { 187 u8 sec_busno; 188 struct pci_bus *child_bus; 189 struct pci_dev *child_dev; 190 191 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev)); 192 193 /* get busno of downstream bus */ 194 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); 195 196 /* add to children of PCI bridge dev->bus */ 197 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); 198 if (!child_bus) { 199 err("%s: could not add second bus\n", __FUNCTION__); 200 return -EIO; 201 } 202 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); 203 /* do pci_scan_child_bus */ 204 pci_scan_child_bus(child_bus); 205 206 list_for_each_entry(child_dev, &child_bus->devices, bus_list) { 207 eeh_add_device_late(child_dev); 208 } 209 210 /* fixup new pci devices without touching bus struct */ 211 rpaphp_fixup_new_pci_devices(child_bus, 0); 212 213 /* Make the discovered devices available */ 214 pci_bus_add_devices(child_bus); 215 return 0; 216 } 217 218 /***************************************************************************** 219 rpaphp_pci_config_slot() will configure all devices under the 220 given slot->dn and return the the first pci_dev. 221 *****************************************************************************/ 222 static struct pci_dev * 223 rpaphp_pci_config_slot(struct pci_bus *bus) 224 { 225 struct device_node *dn = pci_bus_to_OF_node(bus); 226 struct pci_dev *dev = NULL; 227 int slotno; 228 int num; 229 230 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name); 231 if (!dn || !dn->child) 232 return NULL; 233 234 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 235 236 /* pci_scan_slot should find all children */ 237 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 238 if (num) { 239 rpaphp_fixup_new_pci_devices(bus, 1); 240 pci_bus_add_devices(bus); 241 } 242 if (list_empty(&bus->devices)) { 243 err("%s: No new device found\n", __FUNCTION__); 244 return NULL; 245 } 246 list_for_each_entry(dev, &bus->devices, bus_list) { 247 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) 248 rpaphp_pci_config_bridge(dev); 249 } 250 251 return dev; 252 } 253 254 static void enable_eeh(struct device_node *dn) 255 { 256 struct device_node *sib; 257 258 for (sib = dn->child; sib; sib = sib->sibling) 259 enable_eeh(sib); 260 eeh_add_device_early(dn); 261 return; 262 263 } 264 265 static void print_slot_pci_funcs(struct pci_bus *bus) 266 { 267 struct device_node *dn; 268 struct pci_dev *dev; 269 270 dn = pci_bus_to_OF_node(bus); 271 if (!dn) 272 return; 273 274 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name); 275 list_for_each_entry (dev, &bus->devices, bus_list) 276 dbg("\t%s\n", pci_name(dev)); 277 return; 278 } 279 280 int rpaphp_config_pci_adapter(struct pci_bus *bus) 281 { 282 struct device_node *dn = pci_bus_to_OF_node(bus); 283 struct pci_dev *dev; 284 int rc = -ENODEV; 285 286 dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name); 287 if (!dn) 288 goto exit; 289 290 enable_eeh(dn); 291 dev = rpaphp_pci_config_slot(bus); 292 if (!dev) { 293 err("%s: can't find any devices.\n", __FUNCTION__); 294 goto exit; 295 } 296 print_slot_pci_funcs(bus); 297 rc = 0; 298 exit: 299 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc); 300 return rc; 301 } 302 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter); 303 304 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev) 305 { 306 eeh_remove_device(dev); 307 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 308 struct pci_bus *bus = dev->subordinate; 309 struct list_head *ln; 310 if (!bus) 311 return; 312 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { 313 struct pci_dev *pdev = pci_dev_b(ln); 314 if (pdev) 315 rpaphp_eeh_remove_bus_device(pdev); 316 } 317 318 } 319 return; 320 } 321 322 int rpaphp_unconfig_pci_adapter(struct slot *slot) 323 { 324 struct pci_dev *dev, *tmp; 325 int retval = 0; 326 327 list_for_each_entry_safe(dev, tmp, slot->pci_devs, bus_list) { 328 rpaphp_eeh_remove_bus_device(dev); 329 pci_remove_bus_device(dev); 330 } 331 332 slot->state = NOT_CONFIGURED; 333 info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__, 334 slot->name); 335 return retval; 336 } 337 338 static int setup_pci_hotplug_slot_info(struct slot *slot) 339 { 340 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", 341 __FUNCTION__); 342 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status); 343 rpaphp_get_pci_adapter_status(slot, 1, 344 &slot->hotplug_slot->info-> 345 adapter_status); 346 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) { 347 err("%s: NOT_VALID: skip dn->full_name=%s\n", 348 __FUNCTION__, slot->dn->full_name); 349 return -EINVAL; 350 } 351 return 0; 352 } 353 354 static void set_slot_name(struct slot *slot) 355 { 356 struct pci_bus *bus = slot->bus; 357 struct pci_dev *bridge; 358 359 bridge = bus->self; 360 if (bridge) 361 strcpy(slot->name, pci_name(bridge)); 362 else 363 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus), 364 bus->number); 365 } 366 367 static int setup_pci_slot(struct slot *slot) 368 { 369 struct device_node *dn = slot->dn; 370 struct pci_bus *bus; 371 372 BUG_ON(!dn); 373 bus = rpaphp_find_pci_bus(dn); 374 if (!bus) { 375 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name); 376 goto exit_rc; 377 } 378 379 slot->bus = bus; 380 slot->pci_devs = &bus->devices; 381 set_slot_name(slot); 382 383 /* find slot's pci_dev if it's not empty */ 384 if (slot->hotplug_slot->info->adapter_status == EMPTY) { 385 slot->state = EMPTY; /* slot is empty */ 386 } else { 387 /* slot is occupied */ 388 if (!dn->child) { 389 /* non-empty slot has to have child */ 390 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 391 __FUNCTION__, slot->name); 392 goto exit_rc; 393 } 394 395 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { 396 dbg("%s CONFIGURING pci adapter in slot[%s]\n", 397 __FUNCTION__, slot->name); 398 if (rpaphp_config_pci_adapter(slot->bus)) { 399 err("%s: CONFIG pci adapter failed\n", __FUNCTION__); 400 goto exit_rc; 401 } 402 403 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { 404 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", 405 __FUNCTION__, slot->name); 406 goto exit_rc; 407 } 408 print_slot_pci_funcs(slot->bus); 409 if (!list_empty(slot->pci_devs)) { 410 slot->state = CONFIGURED; 411 } else { 412 /* DLPAR add as opposed to 413 * boot time */ 414 slot->state = NOT_CONFIGURED; 415 } 416 } 417 return 0; 418 exit_rc: 419 dealloc_slot_struct(slot); 420 return -EINVAL; 421 } 422 423 int register_pci_slot(struct slot *slot) 424 { 425 int rc = -EINVAL; 426 427 if (setup_pci_hotplug_slot_info(slot)) 428 goto exit_rc; 429 if (setup_pci_slot(slot)) 430 goto exit_rc; 431 rc = register_slot(slot); 432 exit_rc: 433 return rc; 434 } 435 436 int rpaphp_enable_pci_slot(struct slot *slot) 437 { 438 int retval = 0, state; 439 440 retval = rpaphp_get_sensor_state(slot, &state); 441 if (retval) 442 goto exit; 443 dbg("%s: sensor state[%d]\n", __FUNCTION__, state); 444 /* if slot is not empty, enable the adapter */ 445 if (state == PRESENT) { 446 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); 447 retval = rpaphp_config_pci_adapter(slot->bus); 448 if (!retval) { 449 slot->state = CONFIGURED; 450 dbg("%s: PCI devices in slot[%s] has been configured\n", 451 __FUNCTION__, slot->name); 452 } else { 453 slot->state = NOT_CONFIGURED; 454 dbg("%s: no pci_dev struct for adapter in slot[%s]\n", 455 __FUNCTION__, slot->name); 456 } 457 } else if (state == EMPTY) { 458 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); 459 slot->state = EMPTY; 460 } else { 461 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, 462 slot->name); 463 slot->state = NOT_VALID; 464 retval = -EINVAL; 465 } 466 exit: 467 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 468 return retval; 469 } 470