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/slab.h>
  35 #include <linux/pci.h>
  36 #include "shpchp.h"
  37
  38 /* Global variables */
  39 bool shpchp_debug;
  40 bool shpchp_poll_mode;
  41 int shpchp_poll_time;
  42 struct workqueue_struct *shpchp_wq;
  43 struct workqueue_struct *shpchp_ordered_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
  70 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
  71         .set_attention_status = set_attention_status,
  72         .enable_slot =          enable_slot,
  73         .disable_slot =         disable_slot,
  74         .get_power_status =     get_power_status,
  75         .get_attention_status = get_attention_status,
  76         .get_latch_status =     get_latch_status,
  77         .get_adapter_status =   get_adapter_status,
  78 };
  79
  80 /**
  81  * release_slot - free up the memory used by a slot
  82  * @hotplug_slot: slot to free
  83  */
  84 static void release_slot(struct hotplug_slot *hotplug_slot)
  85 {
  86         struct slot *slot = hotplug_slot->private;
  87
  88         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  89                  __func__, slot_name(slot));
  90
  91         kfree(slot->hotplug_slot->info);
  92         kfree(slot->hotplug_slot);
  93         kfree(slot);
  94 }
  95
  96 static int init_slots(struct controller *ctrl)
  97 {
  98         struct slot *slot;
  99         struct hotplug_slot *hotplug_slot;
 100         struct hotplug_slot_info *info;
 101         char name[SLOT_NAME_SIZE];
 102         int retval = -ENOMEM;
 103         int i;
 104
 105         for (i = 0; i < ctrl->num_slots; i++) {
 106                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 107                 if (!slot)
 108                         goto error;
 109
 110                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 111                 if (!hotplug_slot)
 112                         goto error_slot;
 113                 slot->hotplug_slot = hotplug_slot;
 114
 115                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 116                 if (!info)
 117                         goto error_hpslot;
 118                 hotplug_slot->info = info;
 119
 120                 slot->hp_slot = i;
 121                 slot->ctrl = ctrl;
 122                 slot->bus = ctrl->pci_dev->subordinate->number;
 123                 slot->device = ctrl->slot_device_offset + i;
 124                 slot->hpc_ops = ctrl->hpc_ops;
 125                 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
 126                 mutex_init(&slot->lock);
 127                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
 128
 129                 /* register this slot with the hotplug pci core */
 130                 hotplug_slot->private = slot;
 131                 hotplug_slot->release = &release_slot;
 132                 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
 133                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 134
 135                 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
 136                          "hp_slot=%x sun=%x slot_device_offset=%x\n",
 137                          pci_domain_nr(ctrl->pci_dev->subordinate),
 138                          slot->bus, slot->device, slot->hp_slot, slot->number,
 139                          ctrl->slot_device_offset);
 140                 retval = pci_hp_register(slot->hotplug_slot,
 141                                 ctrl->pci_dev->subordinate, slot->device, name);
 142                 if (retval) {
 143                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 144                                  retval);
 145                         goto error_info;
 146                 }
 147
 148                 get_power_status(hotplug_slot, &info->power_status);
 149                 get_attention_status(hotplug_slot, &info->attention_status);
 150                 get_latch_status(hotplug_slot, &info->latch_status);
 151                 get_adapter_status(hotplug_slot, &info->adapter_status);
 152
 153                 list_add(&slot->slot_list, &ctrl->slot_list);
 154         }
 155
 156         return 0;
 157 error_info:
 158         kfree(info);
 159 error_hpslot:
 160         kfree(hotplug_slot);
 161 error_slot:
 162         kfree(slot);
 163 error:
 164         return retval;
 165 }
 166
 167 void cleanup_slots(struct controller *ctrl)
 168 {
 169         struct list_head *tmp;
 170         struct list_head *next;
 171         struct slot *slot;
 172
 173         list_for_each_safe(tmp, next, &ctrl->slot_list) {
 174                 slot = list_entry(tmp, struct slot, slot_list);
 175                 list_del(&slot->slot_list);
 176                 cancel_delayed_work(&slot->work);
 177                 flush_workqueue(shpchp_wq);
 178                 flush_workqueue(shpchp_ordered_wq);
 179                 pci_hp_deregister(slot->hotplug_slot);
 180         }
 181 }
 182
 183 /*
 184  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 185  */
 186 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 187 {
 188         struct slot *slot = get_slot(hotplug_slot);
 189
 190         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 191                  __func__, slot_name(slot));
 192
 193         hotplug_slot->info->attention_status = status;
 194         slot->hpc_ops->set_attention_status(slot, status);
 195
 196         return 0;
 197 }
 198
 199 static int enable_slot (struct hotplug_slot *hotplug_slot)
 200 {
 201         struct slot *slot = get_slot(hotplug_slot);
 202
 203         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 204                  __func__, slot_name(slot));
 205
 206         return shpchp_sysfs_enable_slot(slot);
 207 }
 208
 209 static int disable_slot (struct hotplug_slot *hotplug_slot)
 210 {
 211         struct slot *slot = get_slot(hotplug_slot);
 212
 213         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 214                  __func__, slot_name(slot));
 215
 216         return shpchp_sysfs_disable_slot(slot);
 217 }
 218
 219 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 220 {
 221         struct slot *slot = get_slot(hotplug_slot);
 222         int retval;
 223
 224         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 225                  __func__, slot_name(slot));
 226
 227         retval = slot->hpc_ops->get_power_status(slot, value);
 228         if (retval < 0)
 229                 *value = hotplug_slot->info->power_status;
 230
 231         return 0;
 232 }
 233
 234 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 235 {
 236         struct slot *slot = get_slot(hotplug_slot);
 237         int retval;
 238
 239         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 240                  __func__, slot_name(slot));
 241
 242         retval = slot->hpc_ops->get_attention_status(slot, value);
 243         if (retval < 0)
 244                 *value = hotplug_slot->info->attention_status;
 245
 246         return 0;
 247 }
 248
 249 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 250 {
 251         struct slot *slot = get_slot(hotplug_slot);
 252         int retval;
 253
 254         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 255                  __func__, slot_name(slot));
 256
 257         retval = slot->hpc_ops->get_latch_status(slot, value);
 258         if (retval < 0)
 259                 *value = hotplug_slot->info->latch_status;
 260
 261         return 0;
 262 }
 263
 264 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 265 {
 266         struct slot *slot = get_slot(hotplug_slot);
 267         int retval;
 268
 269         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 270                  __func__, slot_name(slot));
 271
 272         retval = slot->hpc_ops->get_adapter_status(slot, value);
 273         if (retval < 0)
 274                 *value = hotplug_slot->info->adapter_status;
 275
 276         return 0;
 277 }
 278
 279 static int is_shpc_capable(struct pci_dev *dev)
 280 {
 281         if (dev->vendor == PCI_VENDOR_ID_AMD &&
 282             dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
 283                 return 1;
 284         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
 285                 return 0;
 286         if (get_hp_hw_control_from_firmware(dev))
 287                 return 0;
 288         return 1;
 289 }
 290
 291 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 292 {
 293         int rc;
 294         struct controller *ctrl;
 295
 296         if (!is_shpc_capable(pdev))
 297                 return -ENODEV;
 298
 299         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 300         if (!ctrl) {
 301                 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
 302                 goto err_out_none;
 303         }
 304         INIT_LIST_HEAD(&ctrl->slot_list);
 305
 306         rc = shpc_init(ctrl, pdev);
 307         if (rc) {
 308                 ctrl_dbg(ctrl, "Controller initialization failed\n");
 309                 goto err_out_free_ctrl;
 310         }
 311
 312         pci_set_drvdata(pdev, ctrl);
 313
 314         /* Setup the slot information structures */
 315         rc = init_slots(ctrl);
 316         if (rc) {
 317                 ctrl_err(ctrl, "Slot initialization failed\n");
 318                 goto err_out_release_ctlr;
 319         }
 320
 321         rc = shpchp_create_ctrl_files(ctrl);
 322         if (rc)
 323                 goto err_cleanup_slots;
 324
 325         return 0;
 326
 327 err_cleanup_slots:
 328         cleanup_slots(ctrl);
 329 err_out_release_ctlr:
 330         ctrl->hpc_ops->release_ctlr(ctrl);
 331 err_out_free_ctrl:
 332         kfree(ctrl);
 333 err_out_none:
 334         return -ENODEV;
 335 }
 336
 337 static void shpc_remove(struct pci_dev *dev)
 338 {
 339         struct controller *ctrl = pci_get_drvdata(dev);
 340
 341         shpchp_remove_ctrl_files(ctrl);
 342         ctrl->hpc_ops->release_ctlr(ctrl);
 343         kfree(ctrl);
 344 }
 345
 346 static struct pci_device_id shpcd_pci_tbl[] = {
 347         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 348         { /* end: all zeroes */ }
 349 };
 350 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 351
 352 static struct pci_driver shpc_driver = {
 353         .name =         SHPC_MODULE_NAME,
 354         .id_table =     shpcd_pci_tbl,
 355         .probe =        shpc_probe,
 356         .remove =       shpc_remove,
 357 };
 358
 359 static int __init shpcd_init(void)
 360 {
 361         int retval = 0;
 362
 363         shpchp_wq = alloc_ordered_workqueue("shpchp", 0);
 364         if (!shpchp_wq)
 365                 return -ENOMEM;
 366
 367         shpchp_ordered_wq = alloc_ordered_workqueue("shpchp_ordered", 0);
 368         if (!shpchp_ordered_wq) {
 369                 destroy_workqueue(shpchp_wq);
 370                 return -ENOMEM;
 371         }
 372
 373         retval = pci_register_driver(&shpc_driver);
 374         dbg("%s: pci_register_driver = %d\n", __func__, retval);
 375         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 376         if (retval) {
 377                 destroy_workqueue(shpchp_ordered_wq);
 378                 destroy_workqueue(shpchp_wq);
 379         }
 380         return retval;
 381 }
 382
 383 static void __exit shpcd_cleanup(void)
 384 {
 385         dbg("unload_shpchpd()\n");
 386         pci_unregister_driver(&shpc_driver);
 387         destroy_workqueue(shpchp_ordered_wq);
 388         destroy_workqueue(shpchp_wq);
 389         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 390 }
 391
 392 module_init(shpcd_init);
 393 module_exit(shpcd_cleanup);