err.no Git - linux-2.6/blob - drivers/pci/hotplug/shpchp_core.c

   1 /*
   2  * Standard Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/pci.h>
  35 #include <linux/workqueue.h>
  36 #include "shpchp.h"
  37
  38 /* Global variables */
  39 int shpchp_debug;
  40 int shpchp_poll_mode;
  41 int shpchp_poll_time;
  42 LIST_HEAD(shpchp_ctrl_list);
  43 struct workqueue_struct *shpchp_wq;
  44
  45 #define DRIVER_VERSION  "0.4"
  46 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  47 #define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
  48
  49 MODULE_AUTHOR(DRIVER_AUTHOR);
  50 MODULE_DESCRIPTION(DRIVER_DESC);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(shpchp_debug, bool, 0644);
  54 module_param(shpchp_poll_mode, bool, 0644);
  55 module_param(shpchp_poll_time, int, 0644);
  56 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
  57 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
  58 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
  59
  60 #define SHPC_MODULE_NAME "shpchp"
  61
  62 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  63 static int enable_slot          (struct hotplug_slot *slot);
  64 static int disable_slot         (struct hotplug_slot *slot);
  65 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  66 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  67 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  68 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  69 static int get_address          (struct hotplug_slot *slot, u32 *value);
  70 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  71 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  72
  73 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
  74         .owner =                THIS_MODULE,
  75         .set_attention_status = set_attention_status,
  76         .enable_slot =          enable_slot,
  77         .disable_slot =         disable_slot,
  78         .get_power_status =     get_power_status,
  79         .get_attention_status = get_attention_status,
  80         .get_latch_status =     get_latch_status,
  81         .get_adapter_status =   get_adapter_status,
  82         .get_address =          get_address,
  83         .get_max_bus_speed =    get_max_bus_speed,
  84         .get_cur_bus_speed =    get_cur_bus_speed,
  85 };
  86
  87 /**
  88  * release_slot - free up the memory used by a slot
  89  * @hotplug_slot: slot to free
  90  */
  91 static void release_slot(struct hotplug_slot *hotplug_slot)
  92 {
  93         struct slot *slot = hotplug_slot->private;
  94
  95         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
  96
  97         kfree(slot->hotplug_slot->info);
  98         kfree(slot->hotplug_slot);
  99         kfree(slot);
 100 }
 101
 102 static void make_slot_name(struct slot *slot)
 103 {
 104         snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
 105                  slot->bus, slot->number);
 106 }
 107
 108 static int init_slots(struct controller *ctrl)
 109 {
 110         struct slot *slot;
 111         struct hotplug_slot *hotplug_slot;
 112         struct hotplug_slot_info *info;
 113         int retval = -ENOMEM;
 114         int i;
 115         u32 sun;
 116
 117         for (i = 0; i < ctrl->num_slots; i++) {
 118                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 119                 if (!slot)
 120                         goto error;
 121
 122                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 123                 if (!hotplug_slot)
 124                         goto error_slot;
 125                 slot->hotplug_slot = hotplug_slot;
 126
 127                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 128                 if (!info)
 129                         goto error_hpslot;
 130                 hotplug_slot->info = info;
 131
 132                 hotplug_slot->name = slot->name;
 133
 134                 slot->hp_slot = i;
 135                 slot->ctrl = ctrl;
 136                 slot->bus = ctrl->slot_bus;
 137                 slot->device = ctrl->slot_device_offset + i;
 138                 slot->hpc_ops = ctrl->hpc_ops;
 139                 mutex_init(&slot->lock);
 140
 141                 if (shpchprm_get_physical_slot_number(ctrl, &sun,
 142                                                       slot->bus, slot->device))
 143                         goto error_info;
 144
 145                 slot->number = sun;
 146                 INIT_WORK(&slot->work, queue_pushbutton_work, slot);
 147
 148                 /* register this slot with the hotplug pci core */
 149                 hotplug_slot->private = slot;
 150                 hotplug_slot->release = &release_slot;
 151                 make_slot_name(slot);
 152                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 153
 154                 get_power_status(hotplug_slot, &info->power_status);
 155                 get_attention_status(hotplug_slot, &info->attention_status);
 156                 get_latch_status(hotplug_slot, &info->latch_status);
 157                 get_adapter_status(hotplug_slot, &info->adapter_status);
 158
 159                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 160                     "slot_device_offset=%x\n", slot->bus, slot->device,
 161                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
 162                 retval = pci_hp_register(slot->hotplug_slot);
 163                 if (retval) {
 164                         err("pci_hp_register failed with error %d\n", retval);
 165                         goto error_info;
 166                 }
 167
 168                 list_add(&slot->slot_list, &ctrl->slot_list);
 169         }
 170
 171         return 0;
 172 error_info:
 173         kfree(info);
 174 error_hpslot:
 175         kfree(hotplug_slot);
 176 error_slot:
 177         kfree(slot);
 178 error:
 179         return retval;
 180 }
 181
 182 void cleanup_slots(struct controller *ctrl)
 183 {
 184         struct list_head *tmp;
 185         struct list_head *next;
 186         struct slot *slot;
 187
 188         list_for_each_safe(tmp, next, &ctrl->slot_list) {
 189                 slot = list_entry(tmp, struct slot, slot_list);
 190                 list_del(&slot->slot_list);
 191                 cancel_delayed_work(&slot->work);
 192                 flush_scheduled_work();
 193                 flush_workqueue(shpchp_wq);
 194                 pci_hp_deregister(slot->hotplug_slot);
 195         }
 196 }
 197
 198 static int get_ctlr_slot_config(struct controller *ctrl)
 199 {
 200         int num_ctlr_slots;
 201         int first_device_num;
 202         int physical_slot_num;
 203         int updown;
 204         int rc;
 205         int flags;
 206
 207         rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots,
 208                                        &first_device_num, &physical_slot_num,
 209                                        &updown, &flags);
 210         if (rc) {
 211                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n",
 212                     __FUNCTION__, ctrl->bus, ctrl->device);
 213                 return -1;
 214         }
 215
 216         ctrl->num_slots = num_ctlr_slots;
 217         ctrl->slot_device_offset = first_device_num;
 218         ctrl->first_slot = physical_slot_num;
 219         ctrl->slot_num_inc = updown;            /* either -1 or 1 */
 220
 221         dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d "
 222             "(%x:%x)\n", __FUNCTION__, num_ctlr_slots, first_device_num,
 223             physical_slot_num, updown, ctrl->bus, ctrl->device);
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 230  */
 231 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 232 {
 233         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 234
 235         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 236
 237         hotplug_slot->info->attention_status = status;
 238         slot->hpc_ops->set_attention_status(slot, status);
 239
 240         return 0;
 241 }
 242
 243 static int enable_slot (struct hotplug_slot *hotplug_slot)
 244 {
 245         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 246
 247         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 248
 249         return shpchp_sysfs_enable_slot(slot);
 250 }
 251
 252 static int disable_slot (struct hotplug_slot *hotplug_slot)
 253 {
 254         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 255
 256         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 257
 258         return shpchp_sysfs_disable_slot(slot);
 259 }
 260
 261 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 262 {
 263         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 264         int retval;
 265
 266         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 267
 268         retval = slot->hpc_ops->get_power_status(slot, value);
 269         if (retval < 0)
 270                 *value = hotplug_slot->info->power_status;
 271
 272         return 0;
 273 }
 274
 275 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 276 {
 277         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 278         int retval;
 279
 280         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 281
 282         retval = slot->hpc_ops->get_attention_status(slot, value);
 283         if (retval < 0)
 284                 *value = hotplug_slot->info->attention_status;
 285
 286         return 0;
 287 }
 288
 289 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 290 {
 291         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 292         int retval;
 293
 294         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 295
 296         retval = slot->hpc_ops->get_latch_status(slot, value);
 297         if (retval < 0)
 298                 *value = hotplug_slot->info->latch_status;
 299
 300         return 0;
 301 }
 302
 303 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 304 {
 305         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 306         int retval;
 307
 308         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 309
 310         retval = slot->hpc_ops->get_adapter_status(slot, value);
 311         if (retval < 0)
 312                 *value = hotplug_slot->info->adapter_status;
 313
 314         return 0;
 315 }
 316
 317 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value)
 318 {
 319         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 320         struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
 321
 322         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 323
 324         *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
 325
 326         return 0;
 327 }
 328
 329 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 330 {
 331         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 332         int retval;
 333
 334         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 335
 336         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 337         if (retval < 0)
 338                 *value = PCI_SPEED_UNKNOWN;
 339
 340         return 0;
 341 }
 342
 343 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 344 {
 345         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
 346         int retval;
 347
 348         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 349
 350         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 351         if (retval < 0)
 352                 *value = PCI_SPEED_UNKNOWN;
 353
 354         return 0;
 355 }
 356
 357 static int is_shpc_capable(struct pci_dev *dev)
 358 {
 359        if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
 360                                PCI_DEVICE_ID_AMD_GOLAM_7450))
 361                return 1;
 362        if (pci_find_capability(dev, PCI_CAP_ID_SHPC))
 363                return 1;
 364
 365        return 0;
 366 }
 367
 368 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 369 {
 370         int rc;
 371         struct controller *ctrl;
 372         struct slot *t_slot;
 373         int first_device_num;   /* first PCI device number */
 374         int num_ctlr_slots;     /* number of slots implemented */
 375
 376         if (!is_shpc_capable(pdev))
 377                 return -ENODEV;
 378
 379         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 380         if (!ctrl) {
 381                 err("%s : out of memory\n", __FUNCTION__);
 382                 goto err_out_none;
 383         }
 384         INIT_LIST_HEAD(&ctrl->slot_list);
 385
 386         rc = shpc_init(ctrl, pdev);
 387         if (rc) {
 388                 dbg("%s: controller initialization failed\n",
 389                     SHPC_MODULE_NAME);
 390                 goto err_out_free_ctrl;
 391         }
 392
 393         pci_set_drvdata(pdev, ctrl);
 394
 395         ctrl->bus = pdev->bus->number;
 396         ctrl->slot_bus = pdev->subordinate->number;
 397         ctrl->device = PCI_SLOT(pdev->devfn);
 398         ctrl->function = PCI_FUNC(pdev->devfn);
 399
 400         dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
 401             ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
 402
 403         /*
 404          * Save configuration headers for this and subordinate PCI buses
 405          */
 406         rc = get_ctlr_slot_config(ctrl);
 407         if (rc) {
 408                 err(msg_initialization_err, rc);
 409                 goto err_out_release_ctlr;
 410         }
 411         first_device_num = ctrl->slot_device_offset;
 412         num_ctlr_slots = ctrl->num_slots;
 413
 414         ctrl->add_support = 1;
 415
 416         /* Setup the slot information structures */
 417         rc = init_slots(ctrl);
 418         if (rc) {
 419                 err(msg_initialization_err, 6);
 420                 goto err_out_release_ctlr;
 421         }
 422
 423         /* Now hpc_functions (slot->hpc_ops->functions) are ready  */
 424         t_slot = shpchp_find_slot(ctrl, first_device_num);
 425
 426         /* Check for operation bus speed */
 427         rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
 428         dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
 429
 430         if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
 431                 err(SHPC_MODULE_NAME ": Can't get current bus speed. "
 432                     "Set to 33MHz PCI.\n");
 433                 ctrl->speed = PCI_SPEED_33MHz;
 434         }
 435
 436         list_add(&ctrl->ctrl_list, &shpchp_ctrl_list);
 437
 438         shpchp_create_ctrl_files(ctrl);
 439
 440         return 0;
 441
 442 err_out_release_ctlr:
 443         ctrl->hpc_ops->release_ctlr(ctrl);
 444 err_out_free_ctrl:
 445         kfree(ctrl);
 446 err_out_none:
 447         return -ENODEV;
 448 }
 449
 450 static void __exit unload_shpchpd(void)
 451 {
 452         struct list_head *tmp;
 453         struct list_head *next;
 454         struct controller *ctrl;
 455
 456         list_for_each_safe(tmp, next, &shpchp_ctrl_list) {
 457                 ctrl = list_entry(tmp, struct controller, ctrl_list);
 458                 shpchp_remove_ctrl_files(ctrl);
 459                 ctrl->hpc_ops->release_ctlr(ctrl);
 460                 kfree(ctrl);
 461         }
 462
 463         destroy_workqueue(shpchp_wq);
 464 }
 465
 466 static struct pci_device_id shpcd_pci_tbl[] = {
 467         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 468         { /* end: all zeroes */ }
 469 };
 470 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 471
 472 static struct pci_driver shpc_driver = {
 473         .name =         SHPC_MODULE_NAME,
 474         .id_table =     shpcd_pci_tbl,
 475         .probe =        shpc_probe,
 476         /* remove:      shpc_remove_one, */
 477 };
 478
 479 static int __init shpcd_init(void)
 480 {
 481         int retval = 0;
 482
 483 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
 484         shpchp_poll_mode = 1;
 485 #endif
 486
 487         shpchp_wq = create_singlethread_workqueue("shpchpd");
 488         if (!shpchp_wq)
 489                 return -ENOMEM;
 490
 491         retval = pci_register_driver(&shpc_driver);
 492         dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
 493         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 494         if (retval) {
 495                 destroy_workqueue(shpchp_wq);
 496         }
 497         return retval;
 498 }
 499
 500 static void __exit shpcd_cleanup(void)
 501 {
 502         dbg("unload_shpchpd()\n");
 503         unload_shpchpd();
 504
 505         pci_unregister_driver(&shpc_driver);
 506
 507         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 508 }
 509
 510 module_init(shpcd_init);
 511 module_exit(shpcd_cleanup);