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/config.h> 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/moduleparam.h> 29 #include <linux/pci.h> 30 #include <linux/slab.h> 31 #include <linux/smp.h> 32 #include <linux/smp_lock.h> 33 #include <linux/init.h> 34 #include <asm/eeh.h> /* for eeh_add_device() */ 35 #include <asm/rtas.h> /* rtas_call */ 36 #include <asm/pci-bridge.h> /* for pci_controller */ 37 #include "../pci.h" /* for pci_add_new_bus */ 38 /* and pci_do_scan_bus */ 39 #include "rpaphp.h" 40 #include "pci_hotplug.h" 41 42 int debug; 43 static struct semaphore rpaphp_sem; 44 LIST_HEAD(rpaphp_slot_head); 45 int num_slots; 46 47 #define DRIVER_VERSION "0.1" 48 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" 49 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" 50 51 #define MAX_LOC_CODE 128 52 53 MODULE_AUTHOR(DRIVER_AUTHOR); 54 MODULE_DESCRIPTION(DRIVER_DESC); 55 MODULE_LICENSE("GPL"); 56 57 module_param(debug, bool, 0644); 58 59 static int enable_slot(struct hotplug_slot *slot); 60 static int disable_slot(struct hotplug_slot *slot); 61 static int set_attention_status(struct hotplug_slot *slot, u8 value); 62 static int get_power_status(struct hotplug_slot *slot, u8 * value); 63 static int get_attention_status(struct hotplug_slot *slot, u8 * value); 64 static int get_adapter_status(struct hotplug_slot *slot, u8 * value); 65 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value); 66 67 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { 68 .owner = THIS_MODULE, 69 .enable_slot = enable_slot, 70 .disable_slot = disable_slot, 71 .set_attention_status = set_attention_status, 72 .get_power_status = get_power_status, 73 .get_attention_status = get_attention_status, 74 .get_adapter_status = get_adapter_status, 75 .get_max_bus_speed = get_max_bus_speed, 76 }; 77 78 static int rpaphp_get_attention_status(struct slot *slot) 79 { 80 return slot->hotplug_slot->info->attention_status; 81 } 82 83 /** 84 * set_attention_status - set attention LED 85 * echo 0 > attention -- set LED OFF 86 * echo 1 > attention -- set LED ON 87 * echo 2 > attention -- set LED ID(identify, light is blinking) 88 * 89 */ 90 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) 91 { 92 int retval = 0; 93 struct slot *slot = (struct slot *)hotplug_slot->private; 94 95 down(&rpaphp_sem); 96 switch (value) { 97 case 0: 98 retval = rpaphp_set_attention_status(slot, LED_OFF); 99 hotplug_slot->info->attention_status = 0; 100 break; 101 case 1: 102 default: 103 retval = rpaphp_set_attention_status(slot, LED_ON); 104 hotplug_slot->info->attention_status = 1; 105 break; 106 case 2: 107 retval = rpaphp_set_attention_status(slot, LED_ID); 108 hotplug_slot->info->attention_status = 2; 109 break; 110 } 111 up(&rpaphp_sem); 112 return retval; 113 } 114 115 /** 116 * get_power_status - get power status of a slot 117 * @hotplug_slot: slot to get status 118 * @value: pointer to store status 119 * 120 * 121 */ 122 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) 123 { 124 int retval; 125 struct slot *slot = (struct slot *)hotplug_slot->private; 126 127 down(&rpaphp_sem); 128 retval = rpaphp_get_power_status(slot, value); 129 up(&rpaphp_sem); 130 return retval; 131 } 132 133 /** 134 * get_attention_status - get attention LED status 135 * 136 * 137 */ 138 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) 139 { 140 int retval = 0; 141 struct slot *slot = (struct slot *)hotplug_slot->private; 142 143 down(&rpaphp_sem); 144 *value = rpaphp_get_attention_status(slot); 145 up(&rpaphp_sem); 146 return retval; 147 } 148 149 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) 150 { 151 struct slot *slot = (struct slot *)hotplug_slot->private; 152 int retval = 0; 153 154 down(&rpaphp_sem); 155 /* have to go through this */ 156 switch (slot->dev_type) { 157 case PCI_DEV: 158 retval = rpaphp_get_pci_adapter_status(slot, 0, value); 159 break; 160 case VIO_DEV: 161 retval = rpaphp_get_vio_adapter_status(slot, 0, value); 162 break; 163 default: 164 retval = -EINVAL; 165 } 166 up(&rpaphp_sem); 167 return retval; 168 } 169 170 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 171 { 172 struct slot *slot = (struct slot *)hotplug_slot->private; 173 174 down(&rpaphp_sem); 175 switch (slot->type) { 176 case 1: 177 case 2: 178 case 3: 179 case 4: 180 case 5: 181 case 6: 182 *value = PCI_SPEED_33MHz; /* speed for case 1-6 */ 183 break; 184 case 7: 185 case 8: 186 *value = PCI_SPEED_66MHz; 187 break; 188 case 11: 189 case 14: 190 *value = PCI_SPEED_66MHz_PCIX; 191 break; 192 case 12: 193 case 15: 194 *value = PCI_SPEED_100MHz_PCIX; 195 break; 196 case 13: 197 case 16: 198 *value = PCI_SPEED_133MHz_PCIX; 199 break; 200 default: 201 *value = PCI_SPEED_UNKNOWN; 202 break; 203 204 } 205 up(&rpaphp_sem); 206 return 0; 207 } 208 209 int rpaphp_remove_slot(struct slot *slot) 210 { 211 return deregister_slot(slot); 212 } 213 214 static int get_children_props(struct device_node *dn, int **drc_indexes, 215 int **drc_names, int **drc_types, int **drc_power_domains) 216 { 217 int *indexes, *names; 218 int *types, *domains; 219 220 indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL); 221 names = (int *) get_property(dn, "ibm,drc-names", NULL); 222 types = (int *) get_property(dn, "ibm,drc-types", NULL); 223 domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL); 224 225 if (!indexes || !names || !types || !domains) { 226 /* Slot does not have dynamically-removable children */ 227 return -EINVAL; 228 } 229 if (drc_indexes) 230 *drc_indexes = indexes; 231 if (drc_names) 232 /* &drc_names[1] contains NULL terminated slot names */ 233 *drc_names = names; 234 if (drc_types) 235 /* &drc_types[1] contains NULL terminated slot types */ 236 *drc_types = types; 237 if (drc_power_domains) 238 *drc_power_domains = domains; 239 240 return 0; 241 } 242 243 /* To get the DRC props describing the current node, first obtain it's 244 * my-drc-index property. Next obtain the DRC list from it's parent. Use 245 * the my-drc-index for correlation, and obtain the requested properties. 246 */ 247 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, 248 char **drc_name, char **drc_type, int *drc_power_domain) 249 { 250 int *indexes, *names; 251 int *types, *domains; 252 unsigned int *my_index; 253 char *name_tmp, *type_tmp; 254 int i, rc; 255 256 my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL); 257 if (!my_index) { 258 /* Node isn't DLPAR/hotplug capable */ 259 return -EINVAL; 260 } 261 262 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); 263 if (rc < 0) { 264 return -EINVAL; 265 } 266 267 name_tmp = (char *) &names[1]; 268 type_tmp = (char *) &types[1]; 269 270 /* Iterate through parent properties, looking for my-drc-index */ 271 for (i = 0; i < indexes[0]; i++) { 272 if ((unsigned int) indexes[i + 1] == *my_index) { 273 if (drc_name) 274 *drc_name = name_tmp; 275 if (drc_type) 276 *drc_type = type_tmp; 277 if (drc_index) 278 *drc_index = *my_index; 279 if (drc_power_domain) 280 *drc_power_domain = domains[i+1]; 281 return 0; 282 } 283 name_tmp += (strlen(name_tmp) + 1); 284 type_tmp += (strlen(type_tmp) + 1); 285 } 286 287 return -EINVAL; 288 } 289 290 static int is_php_type(char *drc_type) 291 { 292 unsigned long value; 293 char *endptr; 294 295 /* PCI Hotplug nodes have an integer for drc_type */ 296 value = simple_strtoul(drc_type, &endptr, 10); 297 if (endptr == drc_type) 298 return 0; 299 300 return 1; 301 } 302 303 static int is_php_dn(struct device_node *dn, int **indexes, int **names, 304 int **types, int **power_domains) 305 { 306 int *drc_types; 307 int rc; 308 309 rc = get_children_props(dn, indexes, names, &drc_types, power_domains); 310 if (rc >= 0) { 311 if (is_php_type((char *) &drc_types[1])) { 312 *types = drc_types; 313 return 1; 314 } 315 } 316 317 return 0; 318 } 319 320 static int is_dr_dn(struct device_node *dn, int **indexes, int **names, 321 int **types, int **power_domains, int **my_drc_index) 322 { 323 int rc; 324 325 *my_drc_index = (int *) get_property(dn, "ibm,my-drc-index", NULL); 326 if(!*my_drc_index) 327 return (0); 328 329 if (!dn->parent) 330 return (0); 331 332 rc = get_children_props(dn->parent, indexes, names, types, 333 power_domains); 334 return (rc >= 0); 335 } 336 337 static inline int is_vdevice_root(struct device_node *dn) 338 { 339 return !strcmp(dn->name, "vdevice"); 340 } 341 342 int is_dlpar_type(const char *type_str) 343 { 344 /* Only register DLPAR-capable nodes of drc-type PHB or SLOT */ 345 return (!strcmp(type_str, "PHB") || !strcmp(type_str, "SLOT")); 346 } 347 348 /**************************************************************** 349 * rpaphp not only registers PCI hotplug slots(HOTPLUG), 350 * but also logical DR slots(EMBEDDED). 351 * HOTPLUG slot: An adapter can be physically added/removed. 352 * EMBEDDED slot: An adapter can be logically removed/added 353 * from/to a partition with the slot. 354 ***************************************************************/ 355 int rpaphp_add_slot(struct device_node *dn) 356 { 357 struct slot *slot; 358 int retval = 0; 359 int i, *my_drc_index, slot_type; 360 int *indexes, *names, *types, *power_domains; 361 char *name, *type; 362 363 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name); 364 365 if (dn->parent && is_vdevice_root(dn->parent)) { 366 /* register a VIO device */ 367 retval = register_vio_slot(dn); 368 goto exit; 369 } 370 371 /* register PCI devices */ 372 if (dn->name != 0 && strcmp(dn->name, "pci") == 0) { 373 if (is_php_dn(dn, &indexes, &names, &types, &power_domains)) 374 slot_type = HOTPLUG; 375 else if (is_dr_dn(dn, &indexes, &names, &types, &power_domains, &my_drc_index)) 376 slot_type = EMBEDDED; 377 else goto exit; 378 379 name = (char *) &names[1]; 380 type = (char *) &types[1]; 381 for (i = 0; i < indexes[0]; i++, 382 name += (strlen(name) + 1), type += (strlen(type) + 1)) { 383 384 if (slot_type == HOTPLUG || 385 (slot_type == EMBEDDED && 386 indexes[i + 1] == my_drc_index[0] && 387 is_dlpar_type(type))) { 388 if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name, 389 power_domains[i + 1]))) { 390 retval = -ENOMEM; 391 goto exit; 392 } 393 if (!strcmp(type, "PHB")) 394 slot->type = PHB; 395 else if (slot_type == EMBEDDED) 396 slot->type = EMBEDDED; 397 else 398 slot->type = simple_strtoul(type, NULL, 10); 399 400 dbg(" Found drc-index:0x%x drc-name:%s drc-type:%s\n", 401 indexes[i + 1], name, type); 402 403 retval = register_pci_slot(slot); 404 if (slot_type == EMBEDDED) 405 goto exit; 406 } 407 } 408 } 409 exit: 410 dbg("%s - Exit: num_slots=%d rc[%d]\n", 411 __FUNCTION__, num_slots, retval); 412 return retval; 413 } 414 415 /* 416 * init_slots - initialize 'struct slot' structures for each slot 417 * 418 */ 419 static void init_slots(void) 420 { 421 struct device_node *dn; 422 423 for (dn = find_all_nodes(); dn; dn = dn->next) 424 rpaphp_add_slot(dn); 425 } 426 427 static int __init init_rpa(void) 428 { 429 430 init_MUTEX(&rpaphp_sem); 431 432 /* initialize internal data structure etc. */ 433 init_slots(); 434 if (!num_slots) 435 return -ENODEV; 436 437 return 0; 438 } 439 440 static void __exit cleanup_slots(void) 441 { 442 struct list_head *tmp, *n; 443 struct slot *slot; 444 445 /* 446 * Unregister all of our slots with the pci_hotplug subsystem, 447 * and free up all memory that we had allocated. 448 * memory will be freed in release_slot callback. 449 */ 450 451 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 452 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 453 list_del(&slot->rpaphp_slot_list); 454 pci_hp_deregister(slot->hotplug_slot); 455 } 456 return; 457 } 458 459 static int __init rpaphp_init(void) 460 { 461 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 462 463 /* read all the PRA info from the system */ 464 return init_rpa(); 465 } 466 467 static void __exit rpaphp_exit(void) 468 { 469 cleanup_slots(); 470 } 471 472 static int enable_slot(struct hotplug_slot *hotplug_slot) 473 { 474 int retval = 0; 475 struct slot *slot = (struct slot *)hotplug_slot->private; 476 477 if (slot->state == CONFIGURED) { 478 dbg("%s: %s is already enabled\n", __FUNCTION__, slot->name); 479 goto exit; 480 } 481 482 dbg("ENABLING SLOT %s\n", slot->name); 483 down(&rpaphp_sem); 484 switch (slot->dev_type) { 485 case PCI_DEV: 486 retval = rpaphp_enable_pci_slot(slot); 487 break; 488 case VIO_DEV: 489 retval = rpaphp_enable_vio_slot(slot); 490 break; 491 default: 492 retval = -EINVAL; 493 } 494 up(&rpaphp_sem); 495 exit: 496 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 497 return retval; 498 } 499 500 static int disable_slot(struct hotplug_slot *hotplug_slot) 501 { 502 int retval = -EINVAL; 503 struct slot *slot = (struct slot *)hotplug_slot->private; 504 505 dbg("%s - Entry: slot[%s]\n", __FUNCTION__, slot->name); 506 507 if (slot->state == NOT_CONFIGURED) { 508 dbg("%s: %s is already disabled\n", __FUNCTION__, slot->name); 509 goto exit; 510 } 511 512 dbg("DISABLING SLOT %s\n", slot->name); 513 down(&rpaphp_sem); 514 switch (slot->dev_type) { 515 case PCI_DEV: 516 retval = rpaphp_unconfig_pci_adapter(slot); 517 break; 518 case VIO_DEV: 519 retval = rpaphp_unconfig_vio_adapter(slot); 520 break; 521 default: 522 retval = -ENODEV; 523 } 524 up(&rpaphp_sem); 525 exit: 526 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 527 return retval; 528 } 529 530 module_init(rpaphp_init); 531 module_exit(rpaphp_exit); 532 533 EXPORT_SYMBOL_GPL(rpaphp_add_slot); 534 EXPORT_SYMBOL_GPL(rpaphp_remove_slot); 535 EXPORT_SYMBOL_GPL(rpaphp_slot_head); 536 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); 537