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         .owner =                THIS_MODULE,
  73         .set_attention_status = set_attention_status,
  74         .enable_slot =          enable_slot,
  75         .disable_slot =         disable_slot,
  76         .get_power_status =     get_power_status,
  77         .get_attention_status = get_attention_status,
  78         .get_latch_status =     get_latch_status,
  79         .get_adapter_status =   get_adapter_status,
  80         .get_max_bus_speed =    get_max_bus_speed,
  81         .get_cur_bus_speed =    get_cur_bus_speed,
  82 };
  83
  84 /**
  85  * release_slot - free up the memory used by a slot
  86  * @hotplug_slot: slot to free
  87  */
  88 static void release_slot(struct hotplug_slot *hotplug_slot)
  89 {
  90         struct slot *slot = hotplug_slot->private;
  91
  92         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
  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         int retval = -ENOMEM;
 105         int i, len, dup = 1;
 106
 107         for (i = 0; i < ctrl->num_slots; i++) {
 108                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 109                 if (!slot)
 110                         goto error;
 111
 112                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 113                 if (!hotplug_slot)
 114                         goto error_slot;
 115                 slot->hotplug_slot = hotplug_slot;
 116
 117                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 118                 if (!info)
 119                         goto error_hpslot;
 120                 hotplug_slot->info = info;
 121
 122                 hotplug_slot->name = slot->name;
 123
 124                 slot->hp_slot = i;
 125                 slot->ctrl = ctrl;
 126                 slot->bus = ctrl->pci_dev->subordinate->number;
 127                 slot->device = ctrl->slot_device_offset + i;
 128                 slot->hpc_ops = ctrl->hpc_ops;
 129                 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
 130                 mutex_init(&slot->lock);
 131                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
 132
 133                 /* register this slot with the hotplug pci core */
 134                 hotplug_slot->private = slot;
 135                 hotplug_slot->release = &release_slot;
 136                 snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
 137                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 138
 139                 get_power_status(hotplug_slot, &info->power_status);
 140                 get_attention_status(hotplug_slot, &info->attention_status);
 141                 get_latch_status(hotplug_slot, &info->latch_status);
 142                 get_adapter_status(hotplug_slot, &info->adapter_status);
 143
 144                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 145                     "slot_device_offset=%x\n", slot->bus, slot->device,
 146                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
 147 duplicate_name:
 148                 retval = pci_hp_register(slot->hotplug_slot,
 149                                 ctrl->pci_dev->subordinate, slot->device);
 150                 if (retval) {
 151                         /*
 152                          * If slot N already exists, we'll try to create
 153                          * slot N-1, N-2 ... N-M, until we overflow.
 154                          */
 155                         if (retval == -EEXIST) {
 156                                 len = snprintf(slot->name, SLOT_NAME_SIZE,
 157                                                "%d-%d", slot->number, dup++);
 158                                 if (len < SLOT_NAME_SIZE)
 159                                         goto duplicate_name;
 160                                 else
 161                                         err("duplicate slot name overflow\n");
 162                         }
 163                         err("pci_hp_register failed with error %d\n", retval);
 164                         goto error_info;
 165                 }
 166
 167                 list_add(&slot->slot_list, &ctrl->slot_list);
 168         }
 169
 170         return 0;
 171 error_info:
 172         kfree(info);
 173 error_hpslot:
 174         kfree(hotplug_slot);
 175 error_slot:
 176         kfree(slot);
 177 error:
 178         return retval;
 179 }
 180
 181 void cleanup_slots(struct controller *ctrl)
 182 {
 183         struct list_head *tmp;
 184         struct list_head *next;
 185         struct slot *slot;
 186
 187         list_for_each_safe(tmp, next, &ctrl->slot_list) {
 188                 slot = list_entry(tmp, struct slot, slot_list);
 189                 list_del(&slot->slot_list);
 190                 cancel_delayed_work(&slot->work);
 191                 flush_scheduled_work();
 192                 flush_workqueue(shpchp_wq);
 193                 pci_hp_deregister(slot->hotplug_slot);
 194         }
 195 }
 196
 197 /*
 198  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 199  */
 200 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 201 {
 202         struct slot *slot = get_slot(hotplug_slot);
 203
 204         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 205
 206         hotplug_slot->info->attention_status = status;
 207         slot->hpc_ops->set_attention_status(slot, status);
 208
 209         return 0;
 210 }
 211
 212 static int enable_slot (struct hotplug_slot *hotplug_slot)
 213 {
 214         struct slot *slot = get_slot(hotplug_slot);
 215
 216         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 217
 218         return shpchp_sysfs_enable_slot(slot);
 219 }
 220
 221 static int disable_slot (struct hotplug_slot *hotplug_slot)
 222 {
 223         struct slot *slot = get_slot(hotplug_slot);
 224
 225         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 226
 227         return shpchp_sysfs_disable_slot(slot);
 228 }
 229
 230 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 231 {
 232         struct slot *slot = get_slot(hotplug_slot);
 233         int retval;
 234
 235         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 236
 237         retval = slot->hpc_ops->get_power_status(slot, value);
 238         if (retval < 0)
 239                 *value = hotplug_slot->info->power_status;
 240
 241         return 0;
 242 }
 243
 244 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 245 {
 246         struct slot *slot = get_slot(hotplug_slot);
 247         int retval;
 248
 249         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 250
 251         retval = slot->hpc_ops->get_attention_status(slot, value);
 252         if (retval < 0)
 253                 *value = hotplug_slot->info->attention_status;
 254
 255         return 0;
 256 }
 257
 258 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 259 {
 260         struct slot *slot = get_slot(hotplug_slot);
 261         int retval;
 262
 263         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 264
 265         retval = slot->hpc_ops->get_latch_status(slot, value);
 266         if (retval < 0)
 267                 *value = hotplug_slot->info->latch_status;
 268
 269         return 0;
 270 }
 271
 272 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 273 {
 274         struct slot *slot = get_slot(hotplug_slot);
 275         int retval;
 276
 277         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 278
 279         retval = slot->hpc_ops->get_adapter_status(slot, value);
 280         if (retval < 0)
 281                 *value = hotplug_slot->info->adapter_status;
 282
 283         return 0;
 284 }
 285
 286 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
 287                                 enum pci_bus_speed *value)
 288 {
 289         struct slot *slot = get_slot(hotplug_slot);
 290         int retval;
 291
 292         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 293
 294         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 295         if (retval < 0)
 296                 *value = PCI_SPEED_UNKNOWN;
 297
 298         return 0;
 299 }
 300
 301 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 302 {
 303         struct slot *slot = get_slot(hotplug_slot);
 304         int retval;
 305
 306         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 307
 308         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 309         if (retval < 0)
 310                 *value = PCI_SPEED_UNKNOWN;
 311
 312         return 0;
 313 }
 314
 315 static int is_shpc_capable(struct pci_dev *dev)
 316 {
 317         if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
 318                                                 PCI_DEVICE_ID_AMD_GOLAM_7450))
 319                 return 1;
 320         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
 321                 return 0;
 322         if (get_hp_hw_control_from_firmware(dev))
 323                 return 0;
 324         return 1;
 325 }
 326
 327 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 328 {
 329         int rc;
 330         struct controller *ctrl;
 331
 332         if (!is_shpc_capable(pdev))
 333                 return -ENODEV;
 334
 335         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 336         if (!ctrl) {
 337                 err("%s : out of memory\n", __func__);
 338                 goto err_out_none;
 339         }
 340         INIT_LIST_HEAD(&ctrl->slot_list);
 341
 342         rc = shpc_init(ctrl, pdev);
 343         if (rc) {
 344                 dbg("%s: controller initialization failed\n",
 345                     SHPC_MODULE_NAME);
 346                 goto err_out_free_ctrl;
 347         }
 348
 349         pci_set_drvdata(pdev, ctrl);
 350
 351         /* Setup the slot information structures */
 352         rc = init_slots(ctrl);
 353         if (rc) {
 354                 err("%s: slot initialization failed\n", SHPC_MODULE_NAME);
 355                 goto err_out_release_ctlr;
 356         }
 357
 358         rc = shpchp_create_ctrl_files(ctrl);
 359         if (rc)
 360                 goto err_cleanup_slots;
 361
 362         return 0;
 363
 364 err_cleanup_slots:
 365         cleanup_slots(ctrl);
 366 err_out_release_ctlr:
 367         ctrl->hpc_ops->release_ctlr(ctrl);
 368 err_out_free_ctrl:
 369         kfree(ctrl);
 370 err_out_none:
 371         return -ENODEV;
 372 }
 373
 374 static void shpc_remove(struct pci_dev *dev)
 375 {
 376         struct controller *ctrl = pci_get_drvdata(dev);
 377
 378         shpchp_remove_ctrl_files(ctrl);
 379         ctrl->hpc_ops->release_ctlr(ctrl);
 380         kfree(ctrl);
 381 }
 382
 383 static struct pci_device_id shpcd_pci_tbl[] = {
 384         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 385         { /* end: all zeroes */ }
 386 };
 387 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 388
 389 static struct pci_driver shpc_driver = {
 390         .name =         SHPC_MODULE_NAME,
 391         .id_table =     shpcd_pci_tbl,
 392         .probe =        shpc_probe,
 393         .remove =       shpc_remove,
 394 };
 395
 396 static int __init shpcd_init(void)
 397 {
 398         int retval = 0;
 399
 400         retval = pci_register_driver(&shpc_driver);
 401         dbg("%s: pci_register_driver = %d\n", __func__, retval);
 402         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 403         return retval;
 404 }
 405
 406 static void __exit shpcd_cleanup(void)
 407 {
 408         dbg("unload_shpchpd()\n");
 409         pci_unregister_driver(&shpc_driver);
 410         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 411 }
 412
 413 module_init(shpcd_init);
 414 module_exit(shpcd_cleanup);