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 struct workqueue_struct *shpchp_wq;
  43
  44 #define DRIVER_VERSION  "0.4"
  45 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  46 #define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
  47
  48 MODULE_AUTHOR(DRIVER_AUTHOR);
  49 MODULE_DESCRIPTION(DRIVER_DESC);
  50 MODULE_LICENSE("GPL");
  51
  52 module_param(shpchp_debug, bool, 0644);
  53 module_param(shpchp_poll_mode, bool, 0644);
  54 module_param(shpchp_poll_time, int, 0644);
  55 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
  56 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
  57 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
  58
  59 #define SHPC_MODULE_NAME "shpchp"
  60
  61 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  62 static int enable_slot          (struct hotplug_slot *slot);
  63 static int disable_slot         (struct hotplug_slot *slot);
  64 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  65 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  66 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  67 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  68 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  69 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  70
  71 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
  72         .set_attention_status = set_attention_status,
  73         .enable_slot =          enable_slot,
  74         .disable_slot =         disable_slot,
  75         .get_power_status =     get_power_status,
  76         .get_attention_status = get_attention_status,
  77         .get_latch_status =     get_latch_status,
  78         .get_adapter_status =   get_adapter_status,
  79         .get_max_bus_speed =    get_max_bus_speed,
  80         .get_cur_bus_speed =    get_cur_bus_speed,
  81 };
  82
  83 /**
  84  * release_slot - free up the memory used by a slot
  85  * @hotplug_slot: slot to free
  86  */
  87 static void release_slot(struct hotplug_slot *hotplug_slot)
  88 {
  89         struct slot *slot = hotplug_slot->private;
  90
  91         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  92                  __func__, slot_name(slot));
  93
  94         kfree(slot->hotplug_slot->info);
  95         kfree(slot->hotplug_slot);
  96         kfree(slot);
  97 }
  98
  99 static int init_slots(struct controller *ctrl)
 100 {
 101         struct slot *slot;
 102         struct hotplug_slot *hotplug_slot;
 103         struct hotplug_slot_info *info;
 104         char name[SLOT_NAME_SIZE];
 105         int retval = -ENOMEM;
 106         int i;
 107
 108         for (i = 0; i < ctrl->num_slots; i++) {
 109                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 110                 if (!slot)
 111                         goto error;
 112
 113                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 114                 if (!hotplug_slot)
 115                         goto error_slot;
 116                 slot->hotplug_slot = hotplug_slot;
 117
 118                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 119                 if (!info)
 120                         goto error_hpslot;
 121                 hotplug_slot->info = info;
 122
 123                 slot->hp_slot = i;
 124                 slot->ctrl = ctrl;
 125                 slot->bus = ctrl->pci_dev->subordinate->number;
 126                 slot->device = ctrl->slot_device_offset + i;
 127                 slot->hpc_ops = ctrl->hpc_ops;
 128                 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
 129                 mutex_init(&slot->lock);
 130                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
 131
 132                 /* register this slot with the hotplug pci core */
 133                 hotplug_slot->private = slot;
 134                 hotplug_slot->release = &release_slot;
 135                 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
 136                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 137
 138                 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
 139                          "hp_slot=%x sun=%x slot_device_offset=%x\n",
 140                          pci_domain_nr(ctrl->pci_dev->subordinate),
 141                          slot->bus, slot->device, slot->hp_slot, slot->number,
 142                          ctrl->slot_device_offset);
 143                 retval = pci_hp_register(slot->hotplug_slot,
 144                                 ctrl->pci_dev->subordinate, slot->device, name);
 145                 if (retval) {
 146                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 147                                  retval);
 148                         goto error_info;
 149                 }
 150
 151                 get_power_status(hotplug_slot, &info->power_status);
 152                 get_attention_status(hotplug_slot, &info->attention_status);
 153                 get_latch_status(hotplug_slot, &info->latch_status);
 154                 get_adapter_status(hotplug_slot, &info->adapter_status);
 155
 156                 list_add(&slot->slot_list, &ctrl->slot_list);
 157         }
 158
 159         return 0;
 160 error_info:
 161         kfree(info);
 162 error_hpslot:
 163         kfree(hotplug_slot);
 164 error_slot:
 165         kfree(slot);
 166 error:
 167         return retval;
 168 }
 169
 170 void cleanup_slots(struct controller *ctrl)
 171 {
 172         struct list_head *tmp;
 173         struct list_head *next;
 174         struct slot *slot;
 175
 176         list_for_each_safe(tmp, next, &ctrl->slot_list) {
 177                 slot = list_entry(tmp, struct slot, slot_list);
 178                 list_del(&slot->slot_list);
 179                 cancel_delayed_work(&slot->work);
 180                 flush_scheduled_work();
 181                 flush_workqueue(shpchp_wq);
 182                 pci_hp_deregister(slot->hotplug_slot);
 183         }
 184 }
 185
 186 /*
 187  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 188  */
 189 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 190 {
 191         struct slot *slot = get_slot(hotplug_slot);
 192
 193         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 194                  __func__, slot_name(slot));
 195
 196         hotplug_slot->info->attention_status = status;
 197         slot->hpc_ops->set_attention_status(slot, status);
 198
 199         return 0;
 200 }
 201
 202 static int enable_slot (struct hotplug_slot *hotplug_slot)
 203 {
 204         struct slot *slot = get_slot(hotplug_slot);
 205
 206         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 207                  __func__, slot_name(slot));
 208
 209         return shpchp_sysfs_enable_slot(slot);
 210 }
 211
 212 static int disable_slot (struct hotplug_slot *hotplug_slot)
 213 {
 214         struct slot *slot = get_slot(hotplug_slot);
 215
 216         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 217                  __func__, slot_name(slot));
 218
 219         return shpchp_sysfs_disable_slot(slot);
 220 }
 221
 222 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 223 {
 224         struct slot *slot = get_slot(hotplug_slot);
 225         int retval;
 226
 227         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 228                  __func__, slot_name(slot));
 229
 230         retval = slot->hpc_ops->get_power_status(slot, value);
 231         if (retval < 0)
 232                 *value = hotplug_slot->info->power_status;
 233
 234         return 0;
 235 }
 236
 237 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 238 {
 239         struct slot *slot = get_slot(hotplug_slot);
 240         int retval;
 241
 242         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 243                  __func__, slot_name(slot));
 244
 245         retval = slot->hpc_ops->get_attention_status(slot, value);
 246         if (retval < 0)
 247                 *value = hotplug_slot->info->attention_status;
 248
 249         return 0;
 250 }
 251
 252 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 253 {
 254         struct slot *slot = get_slot(hotplug_slot);
 255         int retval;
 256
 257         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 258                  __func__, slot_name(slot));
 259
 260         retval = slot->hpc_ops->get_latch_status(slot, value);
 261         if (retval < 0)
 262                 *value = hotplug_slot->info->latch_status;
 263
 264         return 0;
 265 }
 266
 267 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 268 {
 269         struct slot *slot = get_slot(hotplug_slot);
 270         int retval;
 271
 272         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 273                  __func__, slot_name(slot));
 274
 275         retval = slot->hpc_ops->get_adapter_status(slot, value);
 276         if (retval < 0)
 277                 *value = hotplug_slot->info->adapter_status;
 278
 279         return 0;
 280 }
 281
 282 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
 283                                 enum pci_bus_speed *value)
 284 {
 285         struct slot *slot = get_slot(hotplug_slot);
 286         int retval;
 287
 288         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 289                  __func__, slot_name(slot));
 290
 291         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 292         if (retval < 0)
 293                 *value = PCI_SPEED_UNKNOWN;
 294
 295         return 0;
 296 }
 297
 298 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 299 {
 300         struct slot *slot = get_slot(hotplug_slot);
 301         int retval;
 302
 303         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 304                  __func__, slot_name(slot));
 305
 306         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 307         if (retval < 0)
 308                 *value = PCI_SPEED_UNKNOWN;
 309
 310         return 0;
 311 }
 312
 313 static int is_shpc_capable(struct pci_dev *dev)
 314 {
 315         if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
 316                                                 PCI_DEVICE_ID_AMD_GOLAM_7450))
 317                 return 1;
 318         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
 319                 return 0;
 320         if (get_hp_hw_control_from_firmware(dev))
 321                 return 0;
 322         return 1;
 323 }
 324
 325 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 326 {
 327         int rc;
 328         struct controller *ctrl;
 329
 330         if (!is_shpc_capable(pdev))
 331                 return -ENODEV;
 332
 333         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 334         if (!ctrl) {
 335                 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
 336                 goto err_out_none;
 337         }
 338         INIT_LIST_HEAD(&ctrl->slot_list);
 339
 340         rc = shpc_init(ctrl, pdev);
 341         if (rc) {
 342                 ctrl_dbg(ctrl, "Controller initialization failed\n");
 343                 goto err_out_free_ctrl;
 344         }
 345
 346         pci_set_drvdata(pdev, ctrl);
 347
 348         /* Setup the slot information structures */
 349         rc = init_slots(ctrl);
 350         if (rc) {
 351                 ctrl_err(ctrl, "Slot initialization failed\n");
 352                 goto err_out_release_ctlr;
 353         }
 354
 355         rc = shpchp_create_ctrl_files(ctrl);
 356         if (rc)
 357                 goto err_cleanup_slots;
 358
 359         return 0;
 360
 361 err_cleanup_slots:
 362         cleanup_slots(ctrl);
 363 err_out_release_ctlr:
 364         ctrl->hpc_ops->release_ctlr(ctrl);
 365 err_out_free_ctrl:
 366         kfree(ctrl);
 367 err_out_none:
 368         return -ENODEV;
 369 }
 370
 371 static void shpc_remove(struct pci_dev *dev)
 372 {
 373         struct controller *ctrl = pci_get_drvdata(dev);
 374
 375         shpchp_remove_ctrl_files(ctrl);
 376         ctrl->hpc_ops->release_ctlr(ctrl);
 377         kfree(ctrl);
 378 }
 379
 380 static struct pci_device_id shpcd_pci_tbl[] = {
 381         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 382         { /* end: all zeroes */ }
 383 };
 384 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 385
 386 static struct pci_driver shpc_driver = {
 387         .name =         SHPC_MODULE_NAME,
 388         .id_table =     shpcd_pci_tbl,
 389         .probe =        shpc_probe,
 390         .remove =       shpc_remove,
 391 };
 392
 393 static int __init shpcd_init(void)
 394 {
 395         int retval = 0;
 396
 397         retval = pci_register_driver(&shpc_driver);
 398         dbg("%s: pci_register_driver = %d\n", __func__, retval);
 399         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 400         return retval;
 401 }
 402
 403 static void __exit shpcd_cleanup(void)
 404 {
 405         dbg("unload_shpchpd()\n");
 406         pci_unregister_driver(&shpc_driver);
 407         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 408 }
 409
 410 module_init(shpcd_init);
 411 module_exit(shpcd_cleanup);