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/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
  41 int debug;
  42 static struct semaphore rpaphp_sem;
  43 LIST_HEAD(rpaphp_slot_head);
  44 int num_slots;
  45
  46 #define DRIVER_VERSION  "0.1"
  47 #define DRIVER_AUTHOR   "Linda Xie <lxie@us.ibm.com>"
  48 #define DRIVER_DESC     "RPA HOT Plug PCI Controller Driver"
  49
  50 #define MAX_LOC_CODE 128
  51
  52 MODULE_AUTHOR(DRIVER_AUTHOR);
  53 MODULE_DESCRIPTION(DRIVER_DESC);
  54 MODULE_LICENSE("GPL");
  55
  56 module_param(debug, bool, 0644);
  57
  58 static int rpaphp_get_attention_status(struct slot *slot)
  59 {
  60         return slot->hotplug_slot->info->attention_status;
  61 }
  62
  63 /**
  64  * set_attention_status - set attention LED
  65  * echo 0 > attention -- set LED OFF
  66  * echo 1 > attention -- set LED ON
  67  * echo 2 > attention -- set LED ID(identify, light is blinking)
  68  *
  69  */
  70 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
  71 {
  72         int retval = 0;
  73         struct slot *slot = (struct slot *)hotplug_slot->private;
  74
  75         down(&rpaphp_sem);
  76         switch (value) {
  77         case 0:
  78                 retval = rpaphp_set_attention_status(slot, LED_OFF);
  79                 hotplug_slot->info->attention_status = 0;
  80                 break;
  81         case 1:
  82         default:
  83                 retval = rpaphp_set_attention_status(slot, LED_ON);
  84                 hotplug_slot->info->attention_status = 1;
  85                 break;
  86         case 2:
  87                 retval = rpaphp_set_attention_status(slot, LED_ID);
  88                 hotplug_slot->info->attention_status = 2;
  89                 break;
  90         }
  91         up(&rpaphp_sem);
  92         return retval;
  93 }
  94
  95 /**
  96  * get_power_status - get power status of a slot
  97  * @hotplug_slot: slot to get status
  98  * @value: pointer to store status
  99  *
 100  *
 101  */
 102 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 103 {
 104         int retval;
 105         struct slot *slot = (struct slot *)hotplug_slot->private;
 106
 107         down(&rpaphp_sem);
 108         retval = rpaphp_get_power_status(slot, value);
 109         up(&rpaphp_sem);
 110         return retval;
 111 }
 112
 113 /**
 114  * get_attention_status - get attention LED status
 115  *
 116  *
 117  */
 118 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 119 {
 120         int retval = 0;
 121         struct slot *slot = (struct slot *)hotplug_slot->private;
 122
 123         down(&rpaphp_sem);
 124         *value = rpaphp_get_attention_status(slot);
 125         up(&rpaphp_sem);
 126         return retval;
 127 }
 128
 129 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 130 {
 131         struct slot *slot = (struct slot *)hotplug_slot->private;
 132         int retval = 0;
 133
 134         down(&rpaphp_sem);
 135         retval = rpaphp_get_pci_adapter_status(slot, 0, value);
 136         up(&rpaphp_sem);
 137         return retval;
 138 }
 139
 140 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 141 {
 142         struct slot *slot = (struct slot *)hotplug_slot->private;
 143
 144         down(&rpaphp_sem);
 145         switch (slot->type) {
 146         case 1:
 147         case 2:
 148         case 3:
 149         case 4:
 150         case 5:
 151         case 6:
 152                 *value = PCI_SPEED_33MHz;       /* speed for case 1-6 */
 153                 break;
 154         case 7:
 155         case 8:
 156                 *value = PCI_SPEED_66MHz;
 157                 break;
 158         case 11:
 159         case 14:
 160                 *value = PCI_SPEED_66MHz_PCIX;
 161                 break;
 162         case 12:
 163         case 15:
 164                 *value = PCI_SPEED_100MHz_PCIX;
 165                 break;
 166         case 13:
 167         case 16:
 168                 *value = PCI_SPEED_133MHz_PCIX;
 169                 break;
 170         default:
 171                 *value = PCI_SPEED_UNKNOWN;
 172                 break;
 173
 174         }
 175         up(&rpaphp_sem);
 176         return 0;
 177 }
 178
 179 static int get_children_props(struct device_node *dn, const int **drc_indexes,
 180                 const int **drc_names, const int **drc_types,
 181                 const int **drc_power_domains)
 182 {
 183         const int *indexes, *names, *types, *domains;
 184
 185         indexes = get_property(dn, "ibm,drc-indexes", NULL);
 186         names = get_property(dn, "ibm,drc-names", NULL);
 187         types = get_property(dn, "ibm,drc-types", NULL);
 188         domains = get_property(dn, "ibm,drc-power-domains", NULL);
 189
 190         if (!indexes || !names || !types || !domains) {
 191                 /* Slot does not have dynamically-removable children */
 192                 return -EINVAL;
 193         }
 194         if (drc_indexes)
 195                 *drc_indexes = indexes;
 196         if (drc_names)
 197                 /* &drc_names[1] contains NULL terminated slot names */
 198                 *drc_names = names;
 199         if (drc_types)
 200                 /* &drc_types[1] contains NULL terminated slot types */
 201                 *drc_types = types;
 202         if (drc_power_domains)
 203                 *drc_power_domains = domains;
 204
 205         return 0;
 206 }
 207
 208 /* To get the DRC props describing the current node, first obtain it's
 209  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
 210  * the my-drc-index for correlation, and obtain the requested properties.
 211  */
 212 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
 213                 char **drc_name, char **drc_type, int *drc_power_domain)
 214 {
 215         const int *indexes, *names;
 216         const int *types, *domains;
 217         const unsigned int *my_index;
 218         char *name_tmp, *type_tmp;
 219         int i, rc;
 220
 221         my_index = get_property(dn, "ibm,my-drc-index", NULL);
 222         if (!my_index) {
 223                 /* Node isn't DLPAR/hotplug capable */
 224                 return -EINVAL;
 225         }
 226
 227         rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
 228         if (rc < 0) {
 229                 return -EINVAL;
 230         }
 231
 232         name_tmp = (char *) &names[1];
 233         type_tmp = (char *) &types[1];
 234
 235         /* Iterate through parent properties, looking for my-drc-index */
 236         for (i = 0; i < indexes[0]; i++) {
 237                 if ((unsigned int) indexes[i + 1] == *my_index) {
 238                         if (drc_name)
 239                                 *drc_name = name_tmp;
 240                         if (drc_type)
 241                                 *drc_type = type_tmp;
 242                         if (drc_index)
 243                                 *drc_index = *my_index;
 244                         if (drc_power_domain)
 245                                 *drc_power_domain = domains[i+1];
 246                         return 0;
 247                 }
 248                 name_tmp += (strlen(name_tmp) + 1);
 249                 type_tmp += (strlen(type_tmp) + 1);
 250         }
 251
 252         return -EINVAL;
 253 }
 254
 255 static int is_php_type(char *drc_type)
 256 {
 257         unsigned long value;
 258         char *endptr;
 259
 260         /* PCI Hotplug nodes have an integer for drc_type */
 261         value = simple_strtoul(drc_type, &endptr, 10);
 262         if (endptr == drc_type)
 263                 return 0;
 264
 265         return 1;
 266 }
 267
 268 static int is_php_dn(struct device_node *dn, const int **indexes,
 269                 const int **names, const int **types, const int **power_domains)
 270 {
 271         const int *drc_types;
 272         int rc;
 273
 274         rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 275         if (rc >= 0) {
 276                 if (is_php_type((char *) &drc_types[1])) {
 277                         *types = drc_types;
 278                         return 1;
 279                 }
 280         }
 281
 282         return 0;
 283 }
 284
 285 /**
 286  * rpaphp_add_slot -- add hotplug or dlpar slot
 287  *
 288  *      rpaphp not only registers PCI hotplug slots(HOTPLUG),
 289  *      but also logical DR slots(EMBEDDED).
 290  *      HOTPLUG slot: An adapter can be physically added/removed.
 291  *      EMBEDDED slot: An adapter can be logically removed/added
 292  *                from/to a partition with the slot.
 293  */
 294 int rpaphp_add_slot(struct device_node *dn)
 295 {
 296         struct slot *slot;
 297         int retval = 0;
 298         int i;
 299         const int *indexes, *names, *types, *power_domains;
 300         char *name, *type;
 301
 302         dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
 303
 304         /* register PCI devices */
 305         if (dn->name != 0 && strcmp(dn->name, "pci") == 0) {
 306                 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 307                         goto exit;
 308
 309                 name = (char *) &names[1];
 310                 type = (char *) &types[1];
 311                 for (i = 0; i < indexes[0]; i++,
 312                         name += (strlen(name) + 1), type += (strlen(type) + 1))                 {
 313
 314                         if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name,
 315                                        power_domains[i + 1]))) {
 316                                 retval = -ENOMEM;
 317                                 goto exit;
 318                         }
 319                         slot->type = simple_strtoul(type, NULL, 10);
 320
 321                         dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 322                                         indexes[i + 1], name, type);
 323
 324                         retval = rpaphp_register_pci_slot(slot);
 325                 }
 326         }
 327 exit:
 328         dbg("%s - Exit: num_slots=%d rc[%d]\n",
 329             __FUNCTION__, num_slots, retval);
 330         return retval;
 331 }
 332
 333 static void __exit cleanup_slots(void)
 334 {
 335         struct list_head *tmp, *n;
 336         struct slot *slot;
 337
 338         /*
 339          * Unregister all of our slots with the pci_hotplug subsystem,
 340          * and free up all memory that we had allocated.
 341          * memory will be freed in release_slot callback.
 342          */
 343
 344         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 345                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 346                 list_del(&slot->rpaphp_slot_list);
 347                 pci_hp_deregister(slot->hotplug_slot);
 348         }
 349         return;
 350 }
 351
 352 static int __init rpaphp_init(void)
 353 {
 354         struct device_node *dn = NULL;
 355
 356         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 357         init_MUTEX(&rpaphp_sem);
 358
 359         while ((dn = of_find_node_by_type(dn, "pci")))
 360                 rpaphp_add_slot(dn);
 361
 362         return 0;
 363 }
 364
 365 static void __exit rpaphp_exit(void)
 366 {
 367         cleanup_slots();
 368 }
 369
 370 static int __enable_slot(struct slot *slot)
 371 {
 372         int state;
 373         int retval;
 374
 375         if (slot->state == CONFIGURED)
 376                 return 0;
 377
 378         retval = rpaphp_get_sensor_state(slot, &state);
 379         if (retval)
 380                 return retval;
 381
 382         if (state == PRESENT) {
 383                 pcibios_add_pci_devices(slot->bus);
 384                 slot->state = CONFIGURED;
 385         } else if (state == EMPTY) {
 386                 slot->state = EMPTY;
 387         } else {
 388                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
 389                 slot->state = NOT_VALID;
 390                 return -EINVAL;
 391         }
 392         return 0;
 393 }
 394
 395 static int enable_slot(struct hotplug_slot *hotplug_slot)
 396 {
 397         int retval;
 398         struct slot *slot = (struct slot *)hotplug_slot->private;
 399
 400         down(&rpaphp_sem);
 401         retval = __enable_slot(slot);
 402         up(&rpaphp_sem);
 403
 404         return retval;
 405 }
 406
 407 static int __disable_slot(struct slot *slot)
 408 {
 409         struct pci_dev *dev, *tmp;
 410
 411         if (slot->state == NOT_CONFIGURED)
 412                 return -EINVAL;
 413
 414         list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
 415                 eeh_remove_bus_device(dev);
 416                 pci_remove_bus_device(dev);
 417         }
 418
 419         slot->state = NOT_CONFIGURED;
 420         return 0;
 421 }
 422
 423 static int disable_slot(struct hotplug_slot *hotplug_slot)
 424 {
 425         struct slot *slot = (struct slot *)hotplug_slot->private;
 426         int retval;
 427
 428         down(&rpaphp_sem);
 429         retval = __disable_slot (slot);
 430         up(&rpaphp_sem);
 431
 432         return retval;
 433 }
 434
 435 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
 436         .owner = THIS_MODULE,
 437         .enable_slot = enable_slot,
 438         .disable_slot = disable_slot,
 439         .set_attention_status = set_attention_status,
 440         .get_power_status = get_power_status,
 441         .get_attention_status = get_attention_status,
 442         .get_adapter_status = get_adapter_status,
 443         .get_max_bus_speed = get_max_bus_speed,
 444 };
 445
 446 module_init(rpaphp_init);
 447 module_exit(rpaphp_exit);
 448
 449 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
 450 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
 451 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);