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 <linux/string.h> 27 28 #include <asm/pci-bridge.h> 29 #include <asm/rtas.h> 30 #include <asm/machdep.h> 31 32 #include "../pci.h" /* for pci_add_new_bus */ 33 #include "rpaphp.h" 34 35 static struct pci_bus *find_bus_among_children(struct pci_bus *bus, 36 struct device_node *dn) 37 { 38 struct pci_bus *child = NULL; 39 struct list_head *tmp; 40 struct device_node *busdn; 41 42 busdn = pci_bus_to_OF_node(bus); 43 if (busdn == dn) 44 return bus; 45 46 list_for_each(tmp, &bus->children) { 47 child = find_bus_among_children(pci_bus_b(tmp), dn); 48 if (child) 49 break; 50 } 51 return child; 52 } 53 54 struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn) 55 { 56 struct pci_dn *pdn = dn->data; 57 58 if (!pdn || !pdn->phb || !pdn->phb->bus) 59 return NULL; 60 61 return find_bus_among_children(pdn->phb->bus, dn); 62 } 63 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus); 64 65 int rpaphp_claim_resource(struct pci_dev *dev, int resource) 66 { 67 struct resource *res = &dev->resource[resource]; 68 struct resource *root = pci_find_parent_resource(dev, res); 69 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 70 int err = -EINVAL; 71 72 if (root != NULL) { 73 err = request_resource(root, res); 74 } 75 76 if (err) { 77 err("PCI: %s region %d of %s %s [%lx:%lx]\n", 78 root ? "Address space collision on" : 79 "No parent found for", 80 resource, dtype, pci_name(dev), res->start, res->end); 81 } 82 return err; 83 } 84 85 EXPORT_SYMBOL_GPL(rpaphp_claim_resource); 86 87 static int rpaphp_get_sensor_state(struct slot *slot, int *state) 88 { 89 int rc; 90 int setlevel; 91 92 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); 93 94 if (rc < 0) { 95 if (rc == -EFAULT || rc == -EEXIST) { 96 dbg("%s: slot must be power up to get sensor-state\n", 97 __FUNCTION__); 98 99 /* some slots have to be powered up 100 * before get-sensor will succeed. 101 */ 102 rc = rtas_set_power_level(slot->power_domain, POWER_ON, 103 &setlevel); 104 if (rc < 0) { 105 dbg("%s: power on slot[%s] failed rc=%d.\n", 106 __FUNCTION__, slot->name, rc); 107 } else { 108 rc = rtas_get_sensor(DR_ENTITY_SENSE, 109 slot->index, state); 110 } 111 } else if (rc == -ENODEV) 112 info("%s: slot is unusable\n", __FUNCTION__); 113 else 114 err("%s failed to get sensor state\n", __FUNCTION__); 115 } 116 return rc; 117 } 118 119 /** 120 * get_pci_adapter_status - get the status of a slot 121 * 122 * 0-- slot is empty 123 * 1-- adapter is configured 124 * 2-- adapter is not configured 125 * 3-- not valid 126 */ 127 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value) 128 { 129 struct pci_bus *bus; 130 int state, rc; 131 132 *value = NOT_VALID; 133 rc = rpaphp_get_sensor_state(slot, &state); 134 if (rc) 135 goto exit; 136 137 if (state == EMPTY) 138 *value = EMPTY; 139 else if (state == PRESENT) { 140 if (!is_init) { 141 /* at run-time slot->state can be changed by */ 142 /* config/unconfig adapter */ 143 *value = slot->state; 144 } else { 145 bus = rpaphp_find_pci_bus(slot->dn); 146 if (bus && !list_empty(&bus->devices)) 147 *value = CONFIGURED; 148 else 149 *value = NOT_CONFIGURED; 150 } 151 } 152 exit: 153 return rc; 154 } 155 156 /* Must be called before pci_bus_add_devices */ 157 static void 158 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) 159 { 160 struct pci_dev *dev; 161 162 list_for_each_entry(dev, &bus->devices, bus_list) { 163 /* 164 * Skip already-present devices (which are on the 165 * global device list.) 166 */ 167 if (list_empty(&dev->global_list)) { 168 int i; 169 170 /* Need to setup IOMMU tables */ 171 ppc_md.iommu_dev_setup(dev); 172 173 if(fix_bus) 174 pcibios_fixup_device_resources(dev, bus); 175 pci_read_irq_line(dev); 176 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 177 struct resource *r = &dev->resource[i]; 178 179 if (r->parent || !r->start || !r->flags) 180 continue; 181 rpaphp_claim_resource(dev, i); 182 } 183 } 184 } 185 } 186 187 static int rpaphp_pci_config_bridge(struct pci_dev *dev) 188 { 189 u8 sec_busno; 190 struct pci_bus *child_bus; 191 struct pci_dev *child_dev; 192 193 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev)); 194 195 /* get busno of downstream bus */ 196 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); 197 198 /* add to children of PCI bridge dev->bus */ 199 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); 200 if (!child_bus) { 201 err("%s: could not add second bus\n", __FUNCTION__); 202 return -EIO; 203 } 204 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); 205 /* do pci_scan_child_bus */ 206 pci_scan_child_bus(child_bus); 207 208 list_for_each_entry(child_dev, &child_bus->devices, bus_list) { 209 eeh_add_device_late(child_dev); 210 } 211 212 /* fixup new pci devices without touching bus struct */ 213 rpaphp_fixup_new_pci_devices(child_bus, 0); 214 215 /* Make the discovered devices available */ 216 pci_bus_add_devices(child_bus); 217 return 0; 218 } 219 220 /***************************************************************************** 221 rpaphp_pci_config_slot() will configure all devices under the 222 given slot->dn and return the the first pci_dev. 223 *****************************************************************************/ 224 static struct pci_dev * 225 rpaphp_pci_config_slot(struct pci_bus *bus) 226 { 227 struct device_node *dn = pci_bus_to_OF_node(bus); 228 struct pci_dev *dev = NULL; 229 int slotno; 230 int num; 231 232 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name); 233 if (!dn || !dn->child) 234 return NULL; 235 236 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 237 238 /* pci_scan_slot should find all children */ 239 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 240 if (num) { 241 rpaphp_fixup_new_pci_devices(bus, 1); 242 pci_bus_add_devices(bus); 243 } 244 if (list_empty(&bus->devices)) { 245 err("%s: No new device found\n", __FUNCTION__); 246 return NULL; 247 } 248 list_for_each_entry(dev, &bus->devices, bus_list) { 249 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) 250 rpaphp_pci_config_bridge(dev); 251 } 252 253 return dev; 254 } 255 256 static void enable_eeh(struct device_node *dn) 257 { 258 struct device_node *sib; 259 260 for (sib = dn->child; sib; sib = sib->sibling) 261 enable_eeh(sib); 262 eeh_add_device_early(dn); 263 return; 264 265 } 266 267 static void print_slot_pci_funcs(struct pci_bus *bus) 268 { 269 struct device_node *dn; 270 struct pci_dev *dev; 271 272 dn = pci_bus_to_OF_node(bus); 273 if (!dn) 274 return; 275 276 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name); 277 list_for_each_entry (dev, &bus->devices, bus_list) 278 dbg("\t%s\n", pci_name(dev)); 279 return; 280 } 281 282 int rpaphp_config_pci_adapter(struct pci_bus *bus) 283 { 284 struct device_node *dn = pci_bus_to_OF_node(bus); 285 struct pci_dev *dev; 286 int rc = -ENODEV; 287 288 dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name); 289 if (!dn) 290 goto exit; 291 292 enable_eeh(dn); 293 dev = rpaphp_pci_config_slot(bus); 294 if (!dev) { 295 err("%s: can't find any devices.\n", __FUNCTION__); 296 goto exit; 297 } 298 print_slot_pci_funcs(bus); 299 rc = 0; 300 exit: 301 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc); 302 return rc; 303 } 304 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter); 305 306 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev) 307 { 308 eeh_remove_device(dev); 309 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 310 struct pci_bus *bus = dev->subordinate; 311 struct list_head *ln; 312 if (!bus) 313 return; 314 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { 315 struct pci_dev *pdev = pci_dev_b(ln); 316 if (pdev) 317 rpaphp_eeh_remove_bus_device(pdev); 318 } 319 320 } 321 return; 322 } 323 324 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus) 325 { 326 struct pci_dev *dev, *tmp; 327 328 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 329 rpaphp_eeh_remove_bus_device(dev); 330 pci_remove_bus_device(dev); 331 } 332 return 0; 333 } 334 335 static int setup_pci_hotplug_slot_info(struct slot *slot) 336 { 337 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", 338 __FUNCTION__); 339 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status); 340 rpaphp_get_pci_adapter_status(slot, 1, 341 &slot->hotplug_slot->info-> 342 adapter_status); 343 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) { 344 err("%s: NOT_VALID: skip dn->full_name=%s\n", 345 __FUNCTION__, slot->dn->full_name); 346 return -EINVAL; 347 } 348 return 0; 349 } 350 351 static void set_slot_name(struct slot *slot) 352 { 353 struct pci_bus *bus = slot->bus; 354 struct pci_dev *bridge; 355 356 bridge = bus->self; 357 if (bridge) 358 strcpy(slot->name, pci_name(bridge)); 359 else 360 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus), 361 bus->number); 362 } 363 364 static int setup_pci_slot(struct slot *slot) 365 { 366 struct device_node *dn = slot->dn; 367 struct pci_bus *bus; 368 369 BUG_ON(!dn); 370 bus = rpaphp_find_pci_bus(dn); 371 if (!bus) { 372 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name); 373 goto exit_rc; 374 } 375 376 slot->bus = bus; 377 slot->pci_devs = &bus->devices; 378 set_slot_name(slot); 379 380 /* find slot's pci_dev if it's not empty */ 381 if (slot->hotplug_slot->info->adapter_status == EMPTY) { 382 slot->state = EMPTY; /* slot is empty */ 383 } else { 384 /* slot is occupied */ 385 if (!dn->child) { 386 /* non-empty slot has to have child */ 387 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 388 __FUNCTION__, slot->name); 389 goto exit_rc; 390 } 391 392 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { 393 dbg("%s CONFIGURING pci adapter in slot[%s]\n", 394 __FUNCTION__, slot->name); 395 if (rpaphp_config_pci_adapter(slot->bus)) { 396 err("%s: CONFIG pci adapter failed\n", __FUNCTION__); 397 goto exit_rc; 398 } 399 400 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { 401 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", 402 __FUNCTION__, slot->name); 403 goto exit_rc; 404 } 405 print_slot_pci_funcs(slot->bus); 406 if (!list_empty(slot->pci_devs)) { 407 slot->state = CONFIGURED; 408 } else { 409 /* DLPAR add as opposed to 410 * boot time */ 411 slot->state = NOT_CONFIGURED; 412 } 413 } 414 return 0; 415 exit_rc: 416 dealloc_slot_struct(slot); 417 return -EINVAL; 418 } 419 420 int register_pci_slot(struct slot *slot) 421 { 422 int rc = -EINVAL; 423 424 if (setup_pci_hotplug_slot_info(slot)) 425 goto exit_rc; 426 if (setup_pci_slot(slot)) 427 goto exit_rc; 428 rc = register_slot(slot); 429 exit_rc: 430 return rc; 431 } 432 433 int rpaphp_enable_pci_slot(struct slot *slot) 434 { 435 int retval = 0, state; 436 437 retval = rpaphp_get_sensor_state(slot, &state); 438 if (retval) 439 goto exit; 440 dbg("%s: sensor state[%d]\n", __FUNCTION__, state); 441 /* if slot is not empty, enable the adapter */ 442 if (state == PRESENT) { 443 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); 444 retval = rpaphp_config_pci_adapter(slot->bus); 445 if (!retval) { 446 slot->state = CONFIGURED; 447 dbg("%s: PCI devices in slot[%s] has been configured\n", 448 __FUNCTION__, slot->name); 449 } else { 450 slot->state = NOT_CONFIGURED; 451 dbg("%s: no pci_dev struct for adapter in slot[%s]\n", 452 __FUNCTION__, slot->name); 453 } 454 } else if (state == EMPTY) { 455 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); 456 slot->state = EMPTY; 457 } else { 458 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, 459 slot->name); 460 slot->state = NOT_VALID; 461 retval = -EINVAL; 462 } 463 exit: 464 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 465 return retval; 466 } 467