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         retval = rpaphp_get_pci_adapter_status(slot, 0, value);
 156         up(&rpaphp_sem);
 157         return retval;
 158 }
 159
 160 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 161 {
 162         struct slot *slot = (struct slot *)hotplug_slot->private;
 163
 164         down(&rpaphp_sem);
 165         switch (slot->type) {
 166         case 1:
 167         case 2:
 168         case 3:
 169         case 4:
 170         case 5:
 171         case 6:
 172                 *value = PCI_SPEED_33MHz;       /* speed for case 1-6 */
 173                 break;
 174         case 7:
 175         case 8:
 176                 *value = PCI_SPEED_66MHz;
 177                 break;
 178         case 11:
 179         case 14:
 180                 *value = PCI_SPEED_66MHz_PCIX;
 181                 break;
 182         case 12:
 183         case 15:
 184                 *value = PCI_SPEED_100MHz_PCIX;
 185                 break;
 186         case 13:
 187         case 16:
 188                 *value = PCI_SPEED_133MHz_PCIX;
 189                 break;
 190         default:
 191                 *value = PCI_SPEED_UNKNOWN;
 192                 break;
 193
 194         }
 195         up(&rpaphp_sem);
 196         return 0;
 197 }
 198
 199 int rpaphp_remove_slot(struct slot *slot)
 200 {
 201         return deregister_slot(slot);
 202 }
 203
 204 static int get_children_props(struct device_node *dn, int **drc_indexes,
 205                 int **drc_names, int **drc_types, int **drc_power_domains)
 206 {
 207         int *indexes, *names;
 208         int *types, *domains;
 209
 210         indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL);
 211         names = (int *) get_property(dn, "ibm,drc-names", NULL);
 212         types = (int *) get_property(dn, "ibm,drc-types", NULL);
 213         domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL);
 214
 215         if (!indexes || !names || !types || !domains) {
 216                 /* Slot does not have dynamically-removable children */
 217                 return -EINVAL;
 218         }
 219         if (drc_indexes)
 220                 *drc_indexes = indexes;
 221         if (drc_names)
 222                 /* &drc_names[1] contains NULL terminated slot names */
 223                 *drc_names = names;
 224         if (drc_types)
 225                 /* &drc_types[1] contains NULL terminated slot types */
 226                 *drc_types = types;
 227         if (drc_power_domains)
 228                 *drc_power_domains = domains;
 229
 230         return 0;
 231 }
 232
 233 /* To get the DRC props describing the current node, first obtain it's
 234  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
 235  * the my-drc-index for correlation, and obtain the requested properties.
 236  */
 237 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
 238                 char **drc_name, char **drc_type, int *drc_power_domain)
 239 {
 240         int *indexes, *names;
 241         int *types, *domains;
 242         unsigned int *my_index;
 243         char *name_tmp, *type_tmp;
 244         int i, rc;
 245
 246         my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL);
 247         if (!my_index) {
 248                 /* Node isn't DLPAR/hotplug capable */
 249                 return -EINVAL;
 250         }
 251
 252         rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
 253         if (rc < 0) {
 254                 return -EINVAL;
 255         }
 256
 257         name_tmp = (char *) &names[1];
 258         type_tmp = (char *) &types[1];
 259
 260         /* Iterate through parent properties, looking for my-drc-index */
 261         for (i = 0; i < indexes[0]; i++) {
 262                 if ((unsigned int) indexes[i + 1] == *my_index) {
 263                         if (drc_name)
 264                                 *drc_name = name_tmp;
 265                         if (drc_type)
 266                                 *drc_type = type_tmp;
 267                         if (drc_index)
 268                                 *drc_index = *my_index;
 269                         if (drc_power_domain)
 270                                 *drc_power_domain = domains[i+1];
 271                         return 0;
 272                 }
 273                 name_tmp += (strlen(name_tmp) + 1);
 274                 type_tmp += (strlen(type_tmp) + 1);
 275         }
 276
 277         return -EINVAL;
 278 }
 279
 280 static int is_php_type(char *drc_type)
 281 {
 282         unsigned long value;
 283         char *endptr;
 284
 285         /* PCI Hotplug nodes have an integer for drc_type */
 286         value = simple_strtoul(drc_type, &endptr, 10);
 287         if (endptr == drc_type)
 288                 return 0;
 289
 290         return 1;
 291 }
 292
 293 static int is_php_dn(struct device_node *dn, int **indexes, int **names,
 294                 int **types, int **power_domains)
 295 {
 296         int *drc_types;
 297         int rc;
 298
 299         rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 300         if (rc >= 0) {
 301                 if (is_php_type((char *) &drc_types[1])) {
 302                         *types = drc_types;
 303                         return 1;
 304                 }
 305         }
 306
 307         return 0;
 308 }
 309
 310 /****************************************************************
 311  *      rpaphp not only registers PCI hotplug slots(HOTPLUG),
 312  *      but also logical DR slots(EMBEDDED).
 313  *      HOTPLUG slot: An adapter can be physically added/removed.
 314  *      EMBEDDED slot: An adapter can be logically removed/added
 315  *                from/to a partition with the slot.
 316  ***************************************************************/
 317 int rpaphp_add_slot(struct device_node *dn)
 318 {
 319         struct slot *slot;
 320         int retval = 0;
 321         int i;
 322         int *indexes, *names, *types, *power_domains;
 323         char *name, *type;
 324
 325         dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
 326
 327         /* register PCI devices */
 328         if (dn->name != 0 && strcmp(dn->name, "pci") == 0) {
 329                 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 330                         goto exit;
 331
 332                 name = (char *) &names[1];
 333                 type = (char *) &types[1];
 334                 for (i = 0; i < indexes[0]; i++,
 335                         name += (strlen(name) + 1), type += (strlen(type) + 1))                 {
 336
 337                         if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name,
 338                                        power_domains[i + 1]))) {
 339                                 retval = -ENOMEM;
 340                                 goto exit;
 341                         }
 342                         slot->type = simple_strtoul(type, NULL, 10);
 343
 344                         dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 345                                         indexes[i + 1], name, type);
 346
 347                         retval = register_pci_slot(slot);
 348                 }
 349         }
 350 exit:
 351         dbg("%s - Exit: num_slots=%d rc[%d]\n",
 352             __FUNCTION__, num_slots, retval);
 353         return retval;
 354 }
 355
 356 static void __exit cleanup_slots(void)
 357 {
 358         struct list_head *tmp, *n;
 359         struct slot *slot;
 360
 361         /*
 362          * Unregister all of our slots with the pci_hotplug subsystem,
 363          * and free up all memory that we had allocated.
 364          * memory will be freed in release_slot callback.
 365          */
 366
 367         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 368                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 369                 list_del(&slot->rpaphp_slot_list);
 370                 pci_hp_deregister(slot->hotplug_slot);
 371         }
 372         return;
 373 }
 374
 375 static int __init rpaphp_init(void)
 376 {
 377         struct device_node *dn = NULL;
 378
 379         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 380         init_MUTEX(&rpaphp_sem);
 381
 382         while ((dn = of_find_node_by_type(dn, "pci")))
 383                 rpaphp_add_slot(dn);
 384
 385         if (!num_slots)
 386                 return -ENODEV;
 387
 388         return 0;
 389 }
 390
 391 static void __exit rpaphp_exit(void)
 392 {
 393         cleanup_slots();
 394 }
 395
 396 static int enable_slot(struct hotplug_slot *hotplug_slot)
 397 {
 398         int retval = 0;
 399         struct slot *slot = (struct slot *)hotplug_slot->private;
 400
 401         if (slot->state == CONFIGURED) {
 402                 dbg("%s: %s is already enabled\n", __FUNCTION__, slot->name);
 403                 goto exit;
 404         }
 405
 406         dbg("ENABLING SLOT %s\n", slot->name);
 407         down(&rpaphp_sem);
 408         retval = rpaphp_enable_pci_slot(slot);
 409         up(&rpaphp_sem);
 410 exit:
 411         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 412         return retval;
 413 }
 414
 415 static int disable_slot(struct hotplug_slot *hotplug_slot)
 416 {
 417         int retval = -EINVAL;
 418         struct slot *slot = (struct slot *)hotplug_slot->private;
 419
 420         dbg("%s - Entry: slot[%s]\n", __FUNCTION__, slot->name);
 421
 422         if (slot->state == NOT_CONFIGURED) {
 423                 dbg("%s: %s is already disabled\n", __FUNCTION__, slot->name);
 424                 goto exit;
 425         }
 426
 427         dbg("DISABLING SLOT %s\n", slot->name);
 428         down(&rpaphp_sem);
 429         retval = rpaphp_unconfig_pci_adapter(slot);
 430         up(&rpaphp_sem);
 431 exit:
 432         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 433         return retval;
 434 }
 435
 436 module_init(rpaphp_init);
 437 module_exit(rpaphp_exit);
 438
 439 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
 440 EXPORT_SYMBOL_GPL(rpaphp_remove_slot);
 441 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
 442 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);