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/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/pci.h>
  29 #include <linux/pci_hotplug.h>
  30 #include <linux/smp.h>
  31 #include <linux/init.h>
  32 #include <asm/eeh.h>       /* for eeh_add_device() */
  33 #include <asm/rtas.h>           /* rtas_call */
  34 #include <asm/pci-bridge.h>     /* for pci_controller */
  35 #include "../pci.h"             /* for pci_add_new_bus */
  36                                 /* and pci_do_scan_bus */
  37 #include "rpaphp.h"
  38
  39 int rpaphp_debug;
  40 LIST_HEAD(rpaphp_slot_head);
  41
  42 #define DRIVER_VERSION  "0.1"
  43 #define DRIVER_AUTHOR   "Linda Xie <lxie@us.ibm.com>"
  44 #define DRIVER_DESC     "RPA HOT Plug PCI Controller Driver"
  45
  46 #define MAX_LOC_CODE 128
  47
  48 MODULE_AUTHOR(DRIVER_AUTHOR);
  49 MODULE_DESCRIPTION(DRIVER_DESC);
  50 MODULE_LICENSE("GPL");
  51
  52 module_param_named(debug, rpaphp_debug, bool, 0644);
  53
  54 /**
  55  * set_attention_status - set attention LED
  56  * @hotplug_slot: target &hotplug_slot
  57  * @value: LED control value
  58  *
  59  * echo 0 > attention -- set LED OFF
  60  * echo 1 > attention -- set LED ON
  61  * echo 2 > attention -- set LED ID(identify, light is blinking)
  62  */
  63 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
  64 {
  65         int rc;
  66         struct slot *slot = (struct slot *)hotplug_slot->private;
  67
  68         switch (value) {
  69         case 0:
  70         case 1:
  71         case 2:
  72                 break;
  73         default:
  74                 value = 1;
  75                 break;
  76         }
  77
  78         rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
  79         if (!rc)
  80                 hotplug_slot->info->attention_status = value;
  81
  82         return rc;
  83 }
  84
  85 /**
  86  * get_power_status - get power status of a slot
  87  * @hotplug_slot: slot to get status
  88  * @value: pointer to store status
  89  */
  90 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
  91 {
  92         int retval, level;
  93         struct slot *slot = (struct slot *)hotplug_slot->private;
  94
  95         retval = rtas_get_power_level (slot->power_domain, &level);
  96         if (!retval)
  97                 *value = level;
  98         return retval;
  99 }
 100
 101 /**
 102  * get_attention_status - get attention LED status
 103  * @hotplug_slot: slot to get status
 104  * @value: pointer to store status
 105  */
 106 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 107 {
 108         struct slot *slot = (struct slot *)hotplug_slot->private;
 109         *value = slot->hotplug_slot->info->attention_status;
 110         return 0;
 111 }
 112
 113 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 114 {
 115         struct slot *slot = (struct slot *)hotplug_slot->private;
 116         int rc, state;
 117
 118         rc = rpaphp_get_sensor_state(slot, &state);
 119
 120         *value = NOT_VALID;
 121         if (rc)
 122                 return rc;
 123
 124         if (state == EMPTY)
 125                 *value = EMPTY;
 126         else if (state == PRESENT)
 127                 *value = slot->state;
 128
 129         return 0;
 130 }
 131
 132 static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
 133 {
 134         enum pci_bus_speed speed;
 135         switch (slot->type) {
 136         case 1:
 137         case 2:
 138         case 3:
 139         case 4:
 140         case 5:
 141         case 6:
 142                 speed = PCI_SPEED_33MHz;        /* speed for case 1-6 */
 143                 break;
 144         case 7:
 145         case 8:
 146                 speed = PCI_SPEED_66MHz;
 147                 break;
 148         case 11:
 149         case 14:
 150                 speed = PCI_SPEED_66MHz_PCIX;
 151                 break;
 152         case 12:
 153         case 15:
 154                 speed = PCI_SPEED_100MHz_PCIX;
 155                 break;
 156         case 13:
 157         case 16:
 158                 speed = PCI_SPEED_133MHz_PCIX;
 159                 break;
 160         default:
 161                 speed = PCI_SPEED_UNKNOWN;
 162                 break;
 163         }
 164
 165         return speed;
 166 }
 167
 168 static int get_children_props(struct device_node *dn, const int **drc_indexes,
 169                 const int **drc_names, const int **drc_types,
 170                 const int **drc_power_domains)
 171 {
 172         const int *indexes, *names, *types, *domains;
 173
 174         indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
 175         names = of_get_property(dn, "ibm,drc-names", NULL);
 176         types = of_get_property(dn, "ibm,drc-types", NULL);
 177         domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
 178
 179         if (!indexes || !names || !types || !domains) {
 180                 /* Slot does not have dynamically-removable children */
 181                 return -EINVAL;
 182         }
 183         if (drc_indexes)
 184                 *drc_indexes = indexes;
 185         if (drc_names)
 186                 /* &drc_names[1] contains NULL terminated slot names */
 187                 *drc_names = names;
 188         if (drc_types)
 189                 /* &drc_types[1] contains NULL terminated slot types */
 190                 *drc_types = types;
 191         if (drc_power_domains)
 192                 *drc_power_domains = domains;
 193
 194         return 0;
 195 }
 196
 197 /* To get the DRC props describing the current node, first obtain it's
 198  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
 199  * the my-drc-index for correlation, and obtain the requested properties.
 200  */
 201 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
 202                 char **drc_name, char **drc_type, int *drc_power_domain)
 203 {
 204         const int *indexes, *names;
 205         const int *types, *domains;
 206         const unsigned int *my_index;
 207         char *name_tmp, *type_tmp;
 208         int i, rc;
 209
 210         my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
 211         if (!my_index) {
 212                 /* Node isn't DLPAR/hotplug capable */
 213                 return -EINVAL;
 214         }
 215
 216         rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
 217         if (rc < 0) {
 218                 return -EINVAL;
 219         }
 220
 221         name_tmp = (char *) &names[1];
 222         type_tmp = (char *) &types[1];
 223
 224         /* Iterate through parent properties, looking for my-drc-index */
 225         for (i = 0; i < indexes[0]; i++) {
 226                 if ((unsigned int) indexes[i + 1] == *my_index) {
 227                         if (drc_name)
 228                                 *drc_name = name_tmp;
 229                         if (drc_type)
 230                                 *drc_type = type_tmp;
 231                         if (drc_index)
 232                                 *drc_index = *my_index;
 233                         if (drc_power_domain)
 234                                 *drc_power_domain = domains[i+1];
 235                         return 0;
 236                 }
 237                 name_tmp += (strlen(name_tmp) + 1);
 238                 type_tmp += (strlen(type_tmp) + 1);
 239         }
 240
 241         return -EINVAL;
 242 }
 243
 244 static int is_php_type(char *drc_type)
 245 {
 246         unsigned long value;
 247         char *endptr;
 248
 249         /* PCI Hotplug nodes have an integer for drc_type */
 250         value = simple_strtoul(drc_type, &endptr, 10);
 251         if (endptr == drc_type)
 252                 return 0;
 253
 254         return 1;
 255 }
 256
 257 /**
 258  * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
 259  * @dn: target &device_node
 260  * @indexes: passed to get_children_props()
 261  * @names: passed to get_children_props()
 262  * @types: returned from get_children_props()
 263  * @power_domains:
 264  *
 265  * This routine will return true only if the device node is
 266  * a hotpluggable slot. This routine will return false
 267  * for built-in pci slots (even when the built-in slots are
 268  * dlparable.)
 269  */
 270 static int is_php_dn(struct device_node *dn, const int **indexes,
 271                 const int **names, const int **types, const int **power_domains)
 272 {
 273         const int *drc_types;
 274         int rc;
 275
 276         rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 277         if (rc < 0)
 278                 return 0;
 279
 280         if (!is_php_type((char *) &drc_types[1]))
 281                 return 0;
 282
 283         *types = drc_types;
 284         return 1;
 285 }
 286
 287 /**
 288  * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
 289  * @dn: device node of slot
 290  *
 291  * This subroutine will register a hotplugable slot with the
 292  * PCI hotplug infrastructure. This routine is typicaly called
 293  * during boot time, if the hotplug slots are present at boot time,
 294  * or is called later, by the dlpar add code, if the slot is
 295  * being dynamically added during runtime.
 296  *
 297  * If the device node points at an embedded (built-in) slot, this
 298  * routine will just return without doing anything, since embedded
 299  * slots cannot be hotplugged.
 300  *
 301  * To remove a slot, it suffices to call rpaphp_deregister_slot().
 302  */
 303 int rpaphp_add_slot(struct device_node *dn)
 304 {
 305         struct slot *slot;
 306         int retval = 0;
 307         int i;
 308         const int *indexes, *names, *types, *power_domains;
 309         char *name, *type;
 310
 311         if (!dn->name || strcmp(dn->name, "pci"))
 312                 return 0;
 313
 314         /* If this is not a hotplug slot, return without doing anything. */
 315         if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 316                 return 0;
 317
 318         dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
 319
 320         /* register PCI devices */
 321         name = (char *) &names[1];
 322         type = (char *) &types[1];
 323         for (i = 0; i < indexes[0]; i++) {
 324
 325                 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
 326                 if (!slot)
 327                         return -ENOMEM;
 328
 329                 slot->type = simple_strtoul(type, NULL, 10);
 330
 331                 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 332                                 indexes[i + 1], name, type);
 333
 334                 retval = rpaphp_enable_slot(slot);
 335                 if (!retval)
 336                         retval = rpaphp_register_slot(slot);
 337
 338                 if (retval)
 339                         dealloc_slot_struct(slot);
 340
 341                 name += strlen(name) + 1;
 342                 type += strlen(type) + 1;
 343         }
 344         dbg("%s - Exit: rc[%d]\n", __func__, retval);
 345
 346         /* XXX FIXME: reports a failure only if last entry in loop failed */
 347         return retval;
 348 }
 349
 350 static void __exit cleanup_slots(void)
 351 {
 352         struct list_head *tmp, *n;
 353         struct slot *slot;
 354
 355         /*
 356          * Unregister all of our slots with the pci_hotplug subsystem,
 357          * and free up all memory that we had allocated.
 358          * memory will be freed in release_slot callback.
 359          */
 360
 361         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 362                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 363                 list_del(&slot->rpaphp_slot_list);
 364                 pci_hp_deregister(slot->hotplug_slot);
 365         }
 366         return;
 367 }
 368
 369 static int __init rpaphp_init(void)
 370 {
 371         struct device_node *dn = NULL;
 372
 373         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 374
 375         while ((dn = of_find_node_by_name(dn, "pci")))
 376                 rpaphp_add_slot(dn);
 377
 378         return 0;
 379 }
 380
 381 static void __exit rpaphp_exit(void)
 382 {
 383         cleanup_slots();
 384 }
 385
 386 static int enable_slot(struct hotplug_slot *hotplug_slot)
 387 {
 388         struct slot *slot = (struct slot *)hotplug_slot->private;
 389         int state;
 390         int retval;
 391
 392         if (slot->state == CONFIGURED)
 393                 return 0;
 394
 395         retval = rpaphp_get_sensor_state(slot, &state);
 396         if (retval)
 397                 return retval;
 398
 399         if (state == PRESENT) {
 400                 pcibios_add_pci_devices(slot->bus);
 401                 slot->state = CONFIGURED;
 402         } else if (state == EMPTY) {
 403                 slot->state = EMPTY;
 404         } else {
 405                 err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
 406                 slot->state = NOT_VALID;
 407                 return -EINVAL;
 408         }
 409
 410         slot->bus->max_bus_speed = get_max_bus_speed(slot);
 411         return 0;
 412 }
 413
 414 static int disable_slot(struct hotplug_slot *hotplug_slot)
 415 {
 416         struct slot *slot = (struct slot *)hotplug_slot->private;
 417         if (slot->state == NOT_CONFIGURED)
 418                 return -EINVAL;
 419
 420         pcibios_remove_pci_devices(slot->bus);
 421         slot->state = NOT_CONFIGURED;
 422         return 0;
 423 }
 424
 425 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
 426         .enable_slot = enable_slot,
 427         .disable_slot = disable_slot,
 428         .set_attention_status = set_attention_status,
 429         .get_power_status = get_power_status,
 430         .get_attention_status = get_attention_status,
 431         .get_adapter_status = get_adapter_status,
 432 };
 433
 434 module_init(rpaphp_init);
 435 module_exit(rpaphp_exit);
 436
 437 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
 438 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
 439 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);