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 enum pci_bus_speed get_max_bus_speed(struct slot *slot)
 134 {
 135         enum pci_bus_speed speed;
 136         switch (slot->type) {
 137         case 1:
 138         case 2:
 139         case 3:
 140         case 4:
 141         case 5:
 142         case 6:
 143                 speed = PCI_SPEED_33MHz;        /* speed for case 1-6 */
 144                 break;
 145         case 7:
 146         case 8:
 147                 speed = PCI_SPEED_66MHz;
 148                 break;
 149         case 11:
 150         case 14:
 151                 speed = PCI_SPEED_66MHz_PCIX;
 152                 break;
 153         case 12:
 154         case 15:
 155                 speed = PCI_SPEED_100MHz_PCIX;
 156                 break;
 157         case 13:
 158         case 16:
 159                 speed = PCI_SPEED_133MHz_PCIX;
 160                 break;
 161         default:
 162                 speed = PCI_SPEED_UNKNOWN;
 163                 break;
 164         }
 165
 166         return speed;
 167 }
 168
 169 static int get_children_props(struct device_node *dn, const int **drc_indexes,
 170                 const int **drc_names, const int **drc_types,
 171                 const int **drc_power_domains)
 172 {
 173         const int *indexes, *names, *types, *domains;
 174
 175         indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
 176         names = of_get_property(dn, "ibm,drc-names", NULL);
 177         types = of_get_property(dn, "ibm,drc-types", NULL);
 178         domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
 179
 180         if (!indexes || !names || !types || !domains) {
 181                 /* Slot does not have dynamically-removable children */
 182                 return -EINVAL;
 183         }
 184         if (drc_indexes)
 185                 *drc_indexes = indexes;
 186         if (drc_names)
 187                 /* &drc_names[1] contains NULL terminated slot names */
 188                 *drc_names = names;
 189         if (drc_types)
 190                 /* &drc_types[1] contains NULL terminated slot types */
 191                 *drc_types = types;
 192         if (drc_power_domains)
 193                 *drc_power_domains = domains;
 194
 195         return 0;
 196 }
 197
 198 /* To get the DRC props describing the current node, first obtain it's
 199  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
 200  * the my-drc-index for correlation, and obtain the requested properties.
 201  */
 202 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
 203                 char **drc_name, char **drc_type, int *drc_power_domain)
 204 {
 205         const int *indexes, *names;
 206         const int *types, *domains;
 207         const unsigned int *my_index;
 208         char *name_tmp, *type_tmp;
 209         int i, rc;
 210
 211         my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
 212         if (!my_index) {
 213                 /* Node isn't DLPAR/hotplug capable */
 214                 return -EINVAL;
 215         }
 216
 217         rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
 218         if (rc < 0) {
 219                 return -EINVAL;
 220         }
 221
 222         name_tmp = (char *) &names[1];
 223         type_tmp = (char *) &types[1];
 224
 225         /* Iterate through parent properties, looking for my-drc-index */
 226         for (i = 0; i < indexes[0]; i++) {
 227                 if ((unsigned int) indexes[i + 1] == *my_index) {
 228                         if (drc_name)
 229                                 *drc_name = name_tmp;
 230                         if (drc_type)
 231                                 *drc_type = type_tmp;
 232                         if (drc_index)
 233                                 *drc_index = *my_index;
 234                         if (drc_power_domain)
 235                                 *drc_power_domain = domains[i+1];
 236                         return 0;
 237                 }
 238                 name_tmp += (strlen(name_tmp) + 1);
 239                 type_tmp += (strlen(type_tmp) + 1);
 240         }
 241
 242         return -EINVAL;
 243 }
 244
 245 static int is_php_type(char *drc_type)
 246 {
 247         unsigned long value;
 248         char *endptr;
 249
 250         /* PCI Hotplug nodes have an integer for drc_type */
 251         value = simple_strtoul(drc_type, &endptr, 10);
 252         if (endptr == drc_type)
 253                 return 0;
 254
 255         return 1;
 256 }
 257
 258 /**
 259  * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
 260  * @dn: target &device_node
 261  * @indexes: passed to get_children_props()
 262  * @names: passed to get_children_props()
 263  * @types: returned from get_children_props()
 264  * @power_domains:
 265  *
 266  * This routine will return true only if the device node is
 267  * a hotpluggable slot. This routine will return false
 268  * for built-in pci slots (even when the built-in slots are
 269  * dlparable.)
 270  */
 271 static int is_php_dn(struct device_node *dn, const int **indexes,
 272                 const int **names, const int **types, const int **power_domains)
 273 {
 274         const int *drc_types;
 275         int rc;
 276
 277         rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 278         if (rc < 0)
 279                 return 0;
 280
 281         if (!is_php_type((char *) &drc_types[1]))
 282                 return 0;
 283
 284         *types = drc_types;
 285         return 1;
 286 }
 287
 288 /**
 289  * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
 290  * @dn: device node of slot
 291  *
 292  * This subroutine will register a hotplugable slot with the
 293  * PCI hotplug infrastructure. This routine is typicaly called
 294  * during boot time, if the hotplug slots are present at boot time,
 295  * or is called later, by the dlpar add code, if the slot is
 296  * being dynamically added during runtime.
 297  *
 298  * If the device node points at an embedded (built-in) slot, this
 299  * routine will just return without doing anything, since embedded
 300  * slots cannot be hotplugged.
 301  *
 302  * To remove a slot, it suffices to call rpaphp_deregister_slot().
 303  */
 304 int rpaphp_add_slot(struct device_node *dn)
 305 {
 306         struct slot *slot;
 307         int retval = 0;
 308         int i;
 309         const int *indexes, *names, *types, *power_domains;
 310         char *name, *type;
 311
 312         if (!dn->name || strcmp(dn->name, "pci"))
 313                 return 0;
 314
 315         /* If this is not a hotplug slot, return without doing anything. */
 316         if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 317                 return 0;
 318
 319         dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
 320
 321         /* register PCI devices */
 322         name = (char *) &names[1];
 323         type = (char *) &types[1];
 324         for (i = 0; i < indexes[0]; i++) {
 325
 326                 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
 327                 if (!slot)
 328                         return -ENOMEM;
 329
 330                 slot->type = simple_strtoul(type, NULL, 10);
 331
 332                 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 333                                 indexes[i + 1], name, type);
 334
 335                 retval = rpaphp_enable_slot(slot);
 336                 if (!retval)
 337                         retval = rpaphp_register_slot(slot);
 338
 339                 if (retval)
 340                         dealloc_slot_struct(slot);
 341
 342                 name += strlen(name) + 1;
 343                 type += strlen(type) + 1;
 344         }
 345         dbg("%s - Exit: rc[%d]\n", __func__, retval);
 346
 347         /* XXX FIXME: reports a failure only if last entry in loop failed */
 348         return retval;
 349 }
 350
 351 static void __exit cleanup_slots(void)
 352 {
 353         struct list_head *tmp, *n;
 354         struct slot *slot;
 355
 356         /*
 357          * Unregister all of our slots with the pci_hotplug subsystem,
 358          * and free up all memory that we had allocated.
 359          * memory will be freed in release_slot callback.
 360          */
 361
 362         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 363                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 364                 list_del(&slot->rpaphp_slot_list);
 365                 pci_hp_deregister(slot->hotplug_slot);
 366         }
 367         return;
 368 }
 369
 370 static int __init rpaphp_init(void)
 371 {
 372         struct device_node *dn = NULL;
 373
 374         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 375
 376         while ((dn = of_find_node_by_name(dn, "pci")))
 377                 rpaphp_add_slot(dn);
 378
 379         return 0;
 380 }
 381
 382 static void __exit rpaphp_exit(void)
 383 {
 384         cleanup_slots();
 385 }
 386
 387 static int enable_slot(struct hotplug_slot *hotplug_slot)
 388 {
 389         struct slot *slot = (struct slot *)hotplug_slot->private;
 390         int state;
 391         int retval;
 392
 393         if (slot->state == CONFIGURED)
 394                 return 0;
 395
 396         retval = rpaphp_get_sensor_state(slot, &state);
 397         if (retval)
 398                 return retval;
 399
 400         if (state == PRESENT) {
 401                 pcibios_add_pci_devices(slot->bus);
 402                 slot->state = CONFIGURED;
 403         } else if (state == EMPTY) {
 404                 slot->state = EMPTY;
 405         } else {
 406                 err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
 407                 slot->state = NOT_VALID;
 408                 return -EINVAL;
 409         }
 410
 411         slot->bus->max_bus_speed = get_max_bus_speed(slot);
 412         return 0;
 413 }
 414
 415 static int disable_slot(struct hotplug_slot *hotplug_slot)
 416 {
 417         struct slot *slot = (struct slot *)hotplug_slot->private;
 418         if (slot->state == NOT_CONFIGURED)
 419                 return -EINVAL;
 420
 421         pcibios_remove_pci_devices(slot->bus);
 422         slot->state = NOT_CONFIGURED;
 423         return 0;
 424 }
 425
 426 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
 427         .enable_slot = enable_slot,
 428         .disable_slot = disable_slot,
 429         .set_attention_status = set_attention_status,
 430         .get_power_status = get_power_status,
 431         .get_attention_status = get_attention_status,
 432         .get_adapter_status = get_adapter_status,
 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);