drivers/pci/hotplug/rpaphp_core.c

   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);