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 rpaphp_get_attention_status(struct slot *slot)
  60 {
  61         return slot->hotplug_slot->info->attention_status;
  62 }
  63
  64 /**
  65  * set_attention_status - set attention LED
  66  * echo 0 > attention -- set LED OFF
  67  * echo 1 > attention -- set LED ON
  68  * echo 2 > attention -- set LED ID(identify, light is blinking)
  69  *
  70  */
  71 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
  72 {
  73         int retval = 0;
  74         struct slot *slot = (struct slot *)hotplug_slot->private;
  75
  76         down(&rpaphp_sem);
  77         switch (value) {
  78         case 0:
  79                 retval = rpaphp_set_attention_status(slot, LED_OFF);
  80                 hotplug_slot->info->attention_status = 0;
  81                 break;
  82         case 1:
  83         default:
  84                 retval = rpaphp_set_attention_status(slot, LED_ON);
  85                 hotplug_slot->info->attention_status = 1;
  86                 break;
  87         case 2:
  88                 retval = rpaphp_set_attention_status(slot, LED_ID);
  89                 hotplug_slot->info->attention_status = 2;
  90                 break;
  91         }
  92         up(&rpaphp_sem);
  93         return retval;
  94 }
  95
  96 /**
  97  * get_power_status - get power status of a slot
  98  * @hotplug_slot: slot to get status
  99  * @value: pointer to store status
 100  *
 101  *
 102  */
 103 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 104 {
 105         int retval;
 106         struct slot *slot = (struct slot *)hotplug_slot->private;
 107
 108         down(&rpaphp_sem);
 109         retval = rpaphp_get_power_status(slot, value);
 110         up(&rpaphp_sem);
 111         return retval;
 112 }
 113
 114 /**
 115  * get_attention_status - get attention LED status
 116  *
 117  *
 118  */
 119 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 120 {
 121         int retval = 0;
 122         struct slot *slot = (struct slot *)hotplug_slot->private;
 123
 124         down(&rpaphp_sem);
 125         *value = rpaphp_get_attention_status(slot);
 126         up(&rpaphp_sem);
 127         return retval;
 128 }
 129
 130 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 131 {
 132         struct slot *slot = (struct slot *)hotplug_slot->private;
 133         int retval = 0;
 134
 135         down(&rpaphp_sem);
 136         retval = rpaphp_get_pci_adapter_status(slot, 0, value);
 137         up(&rpaphp_sem);
 138         return retval;
 139 }
 140
 141 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 142 {
 143         struct slot *slot = (struct slot *)hotplug_slot->private;
 144
 145         down(&rpaphp_sem);
 146         switch (slot->type) {
 147         case 1:
 148         case 2:
 149         case 3:
 150         case 4:
 151         case 5:
 152         case 6:
 153                 *value = PCI_SPEED_33MHz;       /* speed for case 1-6 */
 154                 break;
 155         case 7:
 156         case 8:
 157                 *value = PCI_SPEED_66MHz;
 158                 break;
 159         case 11:
 160         case 14:
 161                 *value = PCI_SPEED_66MHz_PCIX;
 162                 break;
 163         case 12:
 164         case 15:
 165                 *value = PCI_SPEED_100MHz_PCIX;
 166                 break;
 167         case 13:
 168         case 16:
 169                 *value = PCI_SPEED_133MHz_PCIX;
 170                 break;
 171         default:
 172                 *value = PCI_SPEED_UNKNOWN;
 173                 break;
 174
 175         }
 176         up(&rpaphp_sem);
 177         return 0;
 178 }
 179
 180 static int get_children_props(struct device_node *dn, int **drc_indexes,
 181                 int **drc_names, int **drc_types, int **drc_power_domains)
 182 {
 183         int *indexes, *names;
 184         int *types, *domains;
 185
 186         indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL);
 187         names = (int *) get_property(dn, "ibm,drc-names", NULL);
 188         types = (int *) get_property(dn, "ibm,drc-types", NULL);
 189         domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL);
 190
 191         if (!indexes || !names || !types || !domains) {
 192                 /* Slot does not have dynamically-removable children */
 193                 return -EINVAL;
 194         }
 195         if (drc_indexes)
 196                 *drc_indexes = indexes;
 197         if (drc_names)
 198                 /* &drc_names[1] contains NULL terminated slot names */
 199                 *drc_names = names;
 200         if (drc_types)
 201                 /* &drc_types[1] contains NULL terminated slot types */
 202                 *drc_types = types;
 203         if (drc_power_domains)
 204                 *drc_power_domains = domains;
 205
 206         return 0;
 207 }
 208
 209 /* To get the DRC props describing the current node, first obtain it's
 210  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
 211  * the my-drc-index for correlation, and obtain the requested properties.
 212  */
 213 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
 214                 char **drc_name, char **drc_type, int *drc_power_domain)
 215 {
 216         int *indexes, *names;
 217         int *types, *domains;
 218         unsigned int *my_index;
 219         char *name_tmp, *type_tmp;
 220         int i, rc;
 221
 222         my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL);
 223         if (!my_index) {
 224                 /* Node isn't DLPAR/hotplug capable */
 225                 return -EINVAL;
 226         }
 227
 228         rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
 229         if (rc < 0) {
 230                 return -EINVAL;
 231         }
 232
 233         name_tmp = (char *) &names[1];
 234         type_tmp = (char *) &types[1];
 235
 236         /* Iterate through parent properties, looking for my-drc-index */
 237         for (i = 0; i < indexes[0]; i++) {
 238                 if ((unsigned int) indexes[i + 1] == *my_index) {
 239                         if (drc_name)
 240                                 *drc_name = name_tmp;
 241                         if (drc_type)
 242                                 *drc_type = type_tmp;
 243                         if (drc_index)
 244                                 *drc_index = *my_index;
 245                         if (drc_power_domain)
 246                                 *drc_power_domain = domains[i+1];
 247                         return 0;
 248                 }
 249                 name_tmp += (strlen(name_tmp) + 1);
 250                 type_tmp += (strlen(type_tmp) + 1);
 251         }
 252
 253         return -EINVAL;
 254 }
 255
 256 static int is_php_type(char *drc_type)
 257 {
 258         unsigned long value;
 259         char *endptr;
 260
 261         /* PCI Hotplug nodes have an integer for drc_type */
 262         value = simple_strtoul(drc_type, &endptr, 10);
 263         if (endptr == drc_type)
 264                 return 0;
 265
 266         return 1;
 267 }
 268
 269 static int is_php_dn(struct device_node *dn, int **indexes, int **names,
 270                 int **types, int **power_domains)
 271 {
 272         int *drc_types;
 273         int rc;
 274
 275         rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 276         if (rc >= 0) {
 277                 if (is_php_type((char *) &drc_types[1])) {
 278                         *types = drc_types;
 279                         return 1;
 280                 }
 281         }
 282
 283         return 0;
 284 }
 285
 286 /**
 287  * rpaphp_add_slot -- add hotplug or dlpar slot
 288  *
 289  *      rpaphp not only registers PCI hotplug slots(HOTPLUG),
 290  *      but also logical DR slots(EMBEDDED).
 291  *      HOTPLUG slot: An adapter can be physically added/removed.
 292  *      EMBEDDED slot: An adapter can be logically removed/added
 293  *                from/to a partition with the slot.
 294  */
 295 int rpaphp_add_slot(struct device_node *dn)
 296 {
 297         struct slot *slot;
 298         int retval = 0;
 299         int i;
 300         int *indexes, *names, *types, *power_domains;
 301         char *name, *type;
 302
 303         dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
 304
 305         /* register PCI devices */
 306         if (dn->name != 0 && strcmp(dn->name, "pci") == 0) {
 307                 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 308                         goto exit;
 309
 310                 name = (char *) &names[1];
 311                 type = (char *) &types[1];
 312                 for (i = 0; i < indexes[0]; i++,
 313                         name += (strlen(name) + 1), type += (strlen(type) + 1))                 {
 314
 315                         if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name,
 316                                        power_domains[i + 1]))) {
 317                                 retval = -ENOMEM;
 318                                 goto exit;
 319                         }
 320                         slot->type = simple_strtoul(type, NULL, 10);
 321
 322                         dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 323                                         indexes[i + 1], name, type);
 324
 325                         retval = rpaphp_register_pci_slot(slot);
 326                 }
 327         }
 328 exit:
 329         dbg("%s - Exit: num_slots=%d rc[%d]\n",
 330             __FUNCTION__, num_slots, retval);
 331         return retval;
 332 }
 333
 334 static void __exit cleanup_slots(void)
 335 {
 336         struct list_head *tmp, *n;
 337         struct slot *slot;
 338
 339         /*
 340          * Unregister all of our slots with the pci_hotplug subsystem,
 341          * and free up all memory that we had allocated.
 342          * memory will be freed in release_slot callback.
 343          */
 344
 345         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 346                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 347                 list_del(&slot->rpaphp_slot_list);
 348                 pci_hp_deregister(slot->hotplug_slot);
 349         }
 350         return;
 351 }
 352
 353 static int __init rpaphp_init(void)
 354 {
 355         struct device_node *dn = NULL;
 356
 357         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 358         init_MUTEX(&rpaphp_sem);
 359
 360         while ((dn = of_find_node_by_type(dn, "pci")))
 361                 rpaphp_add_slot(dn);
 362
 363         if (!num_slots)
 364                 return -ENODEV;
 365
 366         return 0;
 367 }
 368
 369 static void __exit rpaphp_exit(void)
 370 {
 371         cleanup_slots();
 372 }
 373
 374 static int __enable_slot(struct slot *slot)
 375 {
 376         int state;
 377         int retval;
 378
 379         if (slot->state == CONFIGURED)
 380                 return 0;
 381
 382         retval = rpaphp_get_sensor_state(slot, &state);
 383         if (retval)
 384                 return retval;
 385
 386         if (state == PRESENT) {
 387                 pcibios_add_pci_devices(slot->bus);
 388                 slot->state = CONFIGURED;
 389         } else if (state == EMPTY) {
 390                 slot->state = EMPTY;
 391         } else {
 392                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
 393                 slot->state = NOT_VALID;
 394                 return -EINVAL;
 395         }
 396         return 0;
 397 }
 398
 399 static int enable_slot(struct hotplug_slot *hotplug_slot)
 400 {
 401         int retval;
 402         struct slot *slot = (struct slot *)hotplug_slot->private;
 403
 404         down(&rpaphp_sem);
 405         retval = __enable_slot(slot);
 406         up(&rpaphp_sem);
 407
 408         return retval;
 409 }
 410
 411 static int __disable_slot(struct slot *slot)
 412 {
 413         struct pci_dev *dev, *tmp;
 414
 415         if (slot->state == NOT_CONFIGURED)
 416                 return -EINVAL;
 417
 418         list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
 419                 eeh_remove_bus_device(dev);
 420                 pci_remove_bus_device(dev);
 421         }
 422
 423         slot->state = NOT_CONFIGURED;
 424         return 0;
 425 }
 426
 427 static int disable_slot(struct hotplug_slot *hotplug_slot)
 428 {
 429         struct slot *slot = (struct slot *)hotplug_slot->private;
 430         int retval;
 431
 432         down(&rpaphp_sem);
 433         retval = __disable_slot (slot);
 434         up(&rpaphp_sem);
 435
 436         return retval;
 437 }
 438
 439 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
 440         .owner = THIS_MODULE,
 441         .enable_slot = enable_slot,
 442         .disable_slot = disable_slot,
 443         .set_attention_status = set_attention_status,
 444         .get_power_status = get_power_status,
 445         .get_attention_status = get_attention_status,
 446         .get_adapter_status = get_adapter_status,
 447         .get_max_bus_speed = get_max_bus_speed,
 448 };
 449
 450 module_init(rpaphp_init);
 451 module_exit(rpaphp_exit);
 452
 453 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
 454 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
 455 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);