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