git.oblomov.eu Git - linux-2.6/blob - drivers/pci/hotplug/rpaphp_pci.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/pci.h>
  26 #include <linux/string.h>
  27
  28 #include <asm/pci-bridge.h>
  29 #include <asm/rtas.h>
  30 #include <asm/machdep.h>
  31
  32 #include "../pci.h"             /* for pci_add_new_bus */
  33 #include "rpaphp.h"
  34
  35 static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
  36                                         struct device_node *dn)
  37 {
  38         struct pci_bus *child = NULL;
  39         struct list_head *tmp;
  40         struct device_node *busdn;
  41
  42         busdn = pci_bus_to_OF_node(bus);
  43         if (busdn == dn)
  44                 return bus;
  45
  46         list_for_each(tmp, &bus->children) {
  47                 child = find_bus_among_children(pci_bus_b(tmp), dn);
  48                 if (child)
  49                         break;
  50         }
  51         return child;
  52 }
  53
  54 struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
  55 {
  56         struct pci_dn *pdn = dn->data;
  57
  58         if (!pdn  || !pdn->phb || !pdn->phb->bus)
  59                 return NULL;
  60
  61         return find_bus_among_children(pdn->phb->bus, dn);
  62 }
  63 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus);
  64
  65 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
  66 {
  67         int rc;
  68         int setlevel;
  69
  70         rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
  71
  72         if (rc < 0) {
  73                 if (rc == -EFAULT || rc == -EEXIST) {
  74                         dbg("%s: slot must be power up to get sensor-state\n",
  75                             __FUNCTION__);
  76
  77                         /* some slots have to be powered up
  78                          * before get-sensor will succeed.
  79                          */
  80                         rc = rtas_set_power_level(slot->power_domain, POWER_ON,
  81                                                   &setlevel);
  82                         if (rc < 0) {
  83                                 dbg("%s: power on slot[%s] failed rc=%d.\n",
  84                                     __FUNCTION__, slot->name, rc);
  85                         } else {
  86                                 rc = rtas_get_sensor(DR_ENTITY_SENSE,
  87                                                      slot->index, state);
  88                         }
  89                 } else if (rc == -ENODEV)
  90                         info("%s: slot is unusable\n", __FUNCTION__);
  91                 else
  92                         err("%s failed to get sensor state\n", __FUNCTION__);
  93         }
  94         return rc;
  95 }
  96
  97 /**
  98  * get_pci_adapter_status - get the status of a slot
  99  *
 100  * 0-- slot is empty
 101  * 1-- adapter is configured
 102  * 2-- adapter is not configured
 103  * 3-- not valid
 104  */
 105 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
 106 {
 107         struct pci_bus *bus;
 108         int state, rc;
 109
 110         *value = NOT_VALID;
 111         rc = rpaphp_get_sensor_state(slot, &state);
 112         if (rc)
 113                 goto exit;
 114
 115         if (state == EMPTY)
 116                 *value = EMPTY;
 117         else if (state == PRESENT) {
 118                 if (!is_init) {
 119                         /* at run-time slot->state can be changed by */
 120                         /* config/unconfig adapter */
 121                         *value = slot->state;
 122                 } else {
 123                         bus = rpaphp_find_pci_bus(slot->dn);
 124                         if (bus && !list_empty(&bus->devices))
 125                                 *value = CONFIGURED;
 126                         else
 127                                 *value = NOT_CONFIGURED;
 128                 }
 129         }
 130 exit:
 131         return rc;
 132 }
 133
 134 /* Must be called before pci_bus_add_devices */
 135 void rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 136 {
 137         struct pci_dev *dev;
 138
 139         list_for_each_entry(dev, &bus->devices, bus_list) {
 140                 /*
 141                  * Skip already-present devices (which are on the
 142                  * global device list.)
 143                  */
 144                 if (list_empty(&dev->global_list)) {
 145                         int i;
 146
 147                         /* Need to setup IOMMU tables */
 148                         ppc_md.iommu_dev_setup(dev);
 149
 150                         if(fix_bus)
 151                                 pcibios_fixup_device_resources(dev, bus);
 152                         pci_read_irq_line(dev);
 153                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 154                                 struct resource *r = &dev->resource[i];
 155
 156                                 if (r->parent || !r->start || !r->flags)
 157                                         continue;
 158                                 pci_claim_resource(dev, i);
 159                         }
 160                 }
 161         }
 162 }
 163
 164 static void rpaphp_eeh_add_bus_device(struct pci_bus *bus)
 165 {
 166         struct pci_dev *dev;
 167
 168         list_for_each_entry(dev, &bus->devices, bus_list) {
 169                 eeh_add_device_late(dev);
 170                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 171                         struct pci_bus *subbus = dev->subordinate;
 172                         if (subbus)
 173                                 rpaphp_eeh_add_bus_device (subbus);
 174                 }
 175         }
 176 }
 177
 178 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 179 {
 180         u8 sec_busno;
 181         struct pci_bus *child_bus;
 182         struct pci_dev *child_dev;
 183
 184         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
 185
 186         /* get busno of downstream bus */
 187         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 188
 189         /* add to children of PCI bridge dev->bus */
 190         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 191         if (!child_bus) {
 192                 err("%s: could not add second bus\n", __FUNCTION__);
 193                 return -EIO;
 194         }
 195         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 196         /* do pci_scan_child_bus */
 197         pci_scan_child_bus(child_bus);
 198
 199         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 200                 eeh_add_device_late(child_dev);
 201         }
 202
 203          /* fixup new pci devices without touching bus struct */
 204         rpaphp_fixup_new_pci_devices(child_bus, 0);
 205
 206         /* Make the discovered devices available */
 207         pci_bus_add_devices(child_bus);
 208         return 0;
 209 }
 210
 211 void rpaphp_init_new_devs(struct pci_bus *bus)
 212 {
 213         rpaphp_fixup_new_pci_devices(bus, 0);
 214         rpaphp_eeh_add_bus_device(bus);
 215 }
 216 EXPORT_SYMBOL_GPL(rpaphp_init_new_devs);
 217
 218 /*****************************************************************************
 219  rpaphp_pci_config_slot() will  configure all devices under the
 220  given slot->dn and return the the first pci_dev.
 221  *****************************************************************************/
 222 static struct pci_dev *
 223 rpaphp_pci_config_slot(struct pci_bus *bus)
 224 {
 225         struct device_node *dn = pci_bus_to_OF_node(bus);
 226         struct pci_dev *dev = NULL;
 227         int slotno;
 228         int num;
 229
 230         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
 231         if (!dn || !dn->child)
 232                 return NULL;
 233
 234         if (_machine == PLATFORM_PSERIES_LPAR) {
 235                 of_scan_bus(dn, bus);
 236                 if (list_empty(&bus->devices)) {
 237                         err("%s: No new device found\n", __FUNCTION__);
 238                         return NULL;
 239                 }
 240
 241                 rpaphp_init_new_devs(bus);
 242                 pci_bus_add_devices(bus);
 243                 dev = list_entry(&bus->devices, struct pci_dev, bus_list);
 244         } else {
 245                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 246
 247                 /* pci_scan_slot should find all children */
 248                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
 249                 if (num) {
 250                         rpaphp_fixup_new_pci_devices(bus, 1);
 251                         pci_bus_add_devices(bus);
 252                 }
 253                 if (list_empty(&bus->devices)) {
 254                         err("%s: No new device found\n", __FUNCTION__);
 255                         return NULL;
 256                 }
 257                 list_for_each_entry(dev, &bus->devices, bus_list) {
 258                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 259                                 rpaphp_pci_config_bridge(dev);
 260
 261                         rpaphp_eeh_add_bus_device(bus);
 262                 }
 263         }
 264
 265         return dev;
 266 }
 267
 268 static void print_slot_pci_funcs(struct pci_bus *bus)
 269 {
 270         struct device_node *dn;
 271         struct pci_dev *dev;
 272
 273         dn = pci_bus_to_OF_node(bus);
 274         if (!dn)
 275                 return;
 276
 277         dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
 278         list_for_each_entry (dev, &bus->devices, bus_list)
 279                 dbg("\t%s\n", pci_name(dev));
 280         return;
 281 }
 282
 283 int rpaphp_config_pci_adapter(struct pci_bus *bus)
 284 {
 285         struct device_node *dn = pci_bus_to_OF_node(bus);
 286         struct pci_dev *dev;
 287         int rc = -ENODEV;
 288
 289         dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
 290         if (!dn)
 291                 goto exit;
 292
 293         eeh_add_device_tree_early(dn);
 294         dev = rpaphp_pci_config_slot(bus);
 295         if (!dev) {
 296                 err("%s: can't find any devices.\n", __FUNCTION__);
 297                 goto exit;
 298         }
 299         print_slot_pci_funcs(bus);
 300         rc = 0;
 301 exit:
 302         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 303         return rc;
 304 }
 305 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
 306
 307 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 308 {
 309         eeh_remove_device(dev);
 310         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 311                 struct pci_bus *bus = dev->subordinate;
 312                 struct list_head *ln;
 313                 if (!bus)
 314                         return;
 315                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 316                         struct pci_dev *pdev = pci_dev_b(ln);
 317                         if (pdev)
 318                                 rpaphp_eeh_remove_bus_device(pdev);
 319                 }
 320
 321         }
 322         return;
 323 }
 324
 325 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
 326 {
 327         struct pci_dev *dev, *tmp;
 328
 329         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
 330                 rpaphp_eeh_remove_bus_device(dev);
 331                 pci_remove_bus_device(dev);
 332         }
 333         return 0;
 334 }
 335 EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);
 336
 337 static int setup_pci_hotplug_slot_info(struct slot *slot)
 338 {
 339         struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info;
 340
 341         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 342             __FUNCTION__);
 343         rpaphp_get_power_status(slot, &hotplug_slot_info->power_status);
 344         rpaphp_get_pci_adapter_status(slot, 1,
 345                                       &hotplug_slot_info->adapter_status);
 346         if (hotplug_slot_info->adapter_status == NOT_VALID) {
 347                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 348                     __FUNCTION__, slot->dn->full_name);
 349                 return -EINVAL;
 350         }
 351         return 0;
 352 }
 353
 354 static void set_slot_name(struct slot *slot)
 355 {
 356         struct pci_bus *bus = slot->bus;
 357         struct pci_dev *bridge;
 358
 359         bridge = bus->self;
 360         if (bridge)
 361                 strcpy(slot->name, pci_name(bridge));
 362         else
 363                 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
 364                         bus->number);
 365 }
 366
 367 static int setup_pci_slot(struct slot *slot)
 368 {
 369         struct device_node *dn = slot->dn;
 370         struct pci_bus *bus;
 371
 372         BUG_ON(!dn);
 373         bus = rpaphp_find_pci_bus(dn);
 374         if (!bus) {
 375                 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
 376                 goto exit_rc;
 377         }
 378
 379         slot->bus = bus;
 380         slot->pci_devs = &bus->devices;
 381         set_slot_name(slot);
 382
 383         /* find slot's pci_dev if it's not empty */
 384         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 385                 slot->state = EMPTY;    /* slot is empty */
 386         } else {
 387                 /* slot is occupied */
 388                 if (!dn->child) {
 389                         /* non-empty slot has to have child */
 390                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 391                                 __FUNCTION__, slot->name);
 392                         goto exit_rc;
 393                 }
 394
 395                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 396                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 397                                 __FUNCTION__, slot->name);
 398                         if (rpaphp_config_pci_adapter(slot->bus)) {
 399                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 400                                 goto exit_rc;
 401                         }
 402
 403                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
 404                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 405                                 __FUNCTION__, slot->name);
 406                         goto exit_rc;
 407                 }
 408                 print_slot_pci_funcs(slot->bus);
 409                 if (!list_empty(slot->pci_devs)) {
 410                         slot->state = CONFIGURED;
 411                 } else {
 412                         /* DLPAR add as opposed to
 413                          * boot time */
 414                         slot->state = NOT_CONFIGURED;
 415                 }
 416         }
 417         return 0;
 418 exit_rc:
 419         dealloc_slot_struct(slot);
 420         return -EINVAL;
 421 }
 422
 423 int register_pci_slot(struct slot *slot)
 424 {
 425         int rc = -EINVAL;
 426
 427         if (setup_pci_hotplug_slot_info(slot))
 428                 goto exit_rc;
 429         if (setup_pci_slot(slot))
 430                 goto exit_rc;
 431         rc = register_slot(slot);
 432 exit_rc:
 433         return rc;
 434 }
 435
 436 int rpaphp_enable_pci_slot(struct slot *slot)
 437 {
 438         int retval = 0, state;
 439
 440         retval = rpaphp_get_sensor_state(slot, &state);
 441         if (retval)
 442                 goto exit;
 443         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 444         /* if slot is not empty, enable the adapter */
 445         if (state == PRESENT) {
 446                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 447                 retval = rpaphp_config_pci_adapter(slot->bus);
 448                 if (!retval) {
 449                         slot->state = CONFIGURED;
 450                         info("%s: devices in slot[%s] configured\n",
 451                                         __FUNCTION__, slot->name);
 452                 } else {
 453                         slot->state = NOT_CONFIGURED;
 454                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 455                             __FUNCTION__, slot->name);
 456                 }
 457         } else if (state == EMPTY) {
 458                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 459                 slot->state = EMPTY;
 460         } else {
 461                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 462                     slot->name);
 463                 slot->state = NOT_VALID;
 464                 retval = -EINVAL;
 465         }
 466 exit:
 467         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 468         return retval;
 469 }