drivers/pci/hotplug/pciehp_core.c

   1 /*
   2  * PCI Express 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 "pciehp.h"
  36 #include <linux/interrupt.h>
  37 #include <linux/time.h>
  38
  39 /* Global variables */
  40 int pciehp_debug;
  41 int pciehp_poll_mode;
  42 int pciehp_poll_time;
  43 int pciehp_force;
  44 struct workqueue_struct *pciehp_wq;
  45
  46 #define DRIVER_VERSION  "0.4"
  47 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  48 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
  49
  50 MODULE_AUTHOR(DRIVER_AUTHOR);
  51 MODULE_DESCRIPTION(DRIVER_DESC);
  52 MODULE_LICENSE("GPL");
  53
  54 module_param(pciehp_debug, bool, 0644);
  55 module_param(pciehp_poll_mode, bool, 0644);
  56 module_param(pciehp_poll_time, int, 0644);
  57 module_param(pciehp_force, bool, 0644);
  58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
  62
  63 #define PCIE_MODULE_NAME "pciehp"
  64
  65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  66 static int enable_slot          (struct hotplug_slot *slot);
  67 static int disable_slot         (struct hotplug_slot *slot);
  68 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  70 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  71 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  72 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  73 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  74
  75 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
  76         .set_attention_status = set_attention_status,
  77         .enable_slot =          enable_slot,
  78         .disable_slot =         disable_slot,
  79         .get_power_status =     get_power_status,
  80         .get_attention_status = get_attention_status,
  81         .get_latch_status =     get_latch_status,
  82         .get_adapter_status =   get_adapter_status,
  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         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  96                  __func__, hotplug_slot_name(hotplug_slot));
  97
  98         kfree(hotplug_slot->info);
  99         kfree(hotplug_slot);
 100 }
 101
 102 static int init_slots(struct controller *ctrl)
 103 {
 104         struct slot *slot;
 105         struct hotplug_slot *hotplug_slot;
 106         struct hotplug_slot_info *info;
 107         char name[SLOT_NAME_SIZE];
 108         int retval = -ENOMEM;
 109
 110         list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
 111                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 112                 if (!hotplug_slot)
 113                         goto error;
 114
 115                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 116                 if (!info)
 117                         goto error_hpslot;
 118
 119                 /* register this slot with the hotplug pci core */
 120                 hotplug_slot->info = info;
 121                 hotplug_slot->private = slot;
 122                 hotplug_slot->release = &release_slot;
 123                 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 124                 slot->hotplug_slot = hotplug_slot;
 125                 snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
 126
 127                 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
 128                          "hp_slot=%x sun=%x slot_device_offset=%x\n",
 129                          pci_domain_nr(ctrl->pci_dev->subordinate),
 130                          slot->bus, slot->device, slot->hp_slot, slot->number,
 131                          ctrl->slot_device_offset);
 132                 retval = pci_hp_register(hotplug_slot,
 133                                          ctrl->pci_dev->subordinate,
 134                                          slot->device,
 135                                          name);
 136                 if (retval) {
 137                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 138                                  retval);
 139                         goto error_info;
 140                 }
 141                 get_power_status(hotplug_slot, &info->power_status);
 142                 get_attention_status(hotplug_slot, &info->attention_status);
 143                 get_latch_status(hotplug_slot, &info->latch_status);
 144                 get_adapter_status(hotplug_slot, &info->adapter_status);
 145         }
 146
 147         return 0;
 148 error_info:
 149         kfree(info);
 150 error_hpslot:
 151         kfree(hotplug_slot);
 152 error:
 153         return retval;
 154 }
 155
 156 static void cleanup_slots(struct controller *ctrl)
 157 {
 158         struct slot *slot;
 159         list_for_each_entry(slot, &ctrl->slot_list, slot_list)
 160                 pci_hp_deregister(slot->hotplug_slot);
 161 }
 162
 163 /*
 164  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 165  */
 166 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 167 {
 168         struct slot *slot = hotplug_slot->private;
 169
 170         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 171                   __func__, slot_name(slot));
 172
 173         hotplug_slot->info->attention_status = status;
 174
 175         if (ATTN_LED(slot->ctrl))
 176                 slot->hpc_ops->set_attention_status(slot, status);
 177
 178         return 0;
 179 }
 180
 181
 182 static int enable_slot(struct hotplug_slot *hotplug_slot)
 183 {
 184         struct slot *slot = hotplug_slot->private;
 185
 186         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 187                  __func__, slot_name(slot));
 188
 189         return pciehp_sysfs_enable_slot(slot);
 190 }
 191
 192
 193 static int disable_slot(struct hotplug_slot *hotplug_slot)
 194 {
 195         struct slot *slot = hotplug_slot->private;
 196
 197         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 198                   __func__, slot_name(slot));
 199
 200         return pciehp_sysfs_disable_slot(slot);
 201 }
 202
 203 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 204 {
 205         struct slot *slot = hotplug_slot->private;
 206         int retval;
 207
 208         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 209                   __func__, slot_name(slot));
 210
 211         retval = slot->hpc_ops->get_power_status(slot, value);
 212         if (retval < 0)
 213                 *value = hotplug_slot->info->power_status;
 214
 215         return 0;
 216 }
 217
 218 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 219 {
 220         struct slot *slot = hotplug_slot->private;
 221         int retval;
 222
 223         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 224                   __func__, slot_name(slot));
 225
 226         retval = slot->hpc_ops->get_attention_status(slot, value);
 227         if (retval < 0)
 228                 *value = hotplug_slot->info->attention_status;
 229
 230         return 0;
 231 }
 232
 233 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 234 {
 235         struct slot *slot = hotplug_slot->private;
 236         int retval;
 237
 238         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 239                  __func__, slot_name(slot));
 240
 241         retval = slot->hpc_ops->get_latch_status(slot, value);
 242         if (retval < 0)
 243                 *value = hotplug_slot->info->latch_status;
 244
 245         return 0;
 246 }
 247
 248 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 249 {
 250         struct slot *slot = hotplug_slot->private;
 251         int retval;
 252
 253         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 254                  __func__, slot_name(slot));
 255
 256         retval = slot->hpc_ops->get_adapter_status(slot, value);
 257         if (retval < 0)
 258                 *value = hotplug_slot->info->adapter_status;
 259
 260         return 0;
 261 }
 262
 263 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
 264                                 enum pci_bus_speed *value)
 265 {
 266         struct slot *slot = hotplug_slot->private;
 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_max_bus_speed(slot, value);
 273         if (retval < 0)
 274                 *value = PCI_SPEED_UNKNOWN;
 275
 276         return 0;
 277 }
 278
 279 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 280 {
 281         struct slot *slot = hotplug_slot->private;
 282         int retval;
 283
 284         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 285                  __func__, slot_name(slot));
 286
 287         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 288         if (retval < 0)
 289                 *value = PCI_SPEED_UNKNOWN;
 290
 291         return 0;
 292 }
 293
 294 static int pciehp_probe(struct pcie_device *dev)
 295 {
 296         int rc;
 297         struct controller *ctrl;
 298         struct slot *t_slot;
 299         u8 value;
 300         struct pci_dev *pdev = dev->port;
 301
 302         if (pciehp_force)
 303                 dev_info(&dev->device,
 304                          "Bypassing BIOS check for pciehp use on %s\n",
 305                          pci_name(pdev));
 306         else if (pciehp_get_hp_hw_control_from_firmware(pdev))
 307                 goto err_out_none;
 308
 309         ctrl = pcie_init(dev);
 310         if (!ctrl) {
 311                 dev_err(&dev->device, "Controller initialization failed\n");
 312                 goto err_out_none;
 313         }
 314         set_service_data(dev, ctrl);
 315
 316         /* Setup the slot information structures */
 317         rc = init_slots(ctrl);
 318         if (rc) {
 319                 if (rc == -EBUSY)
 320                         ctrl_warn(ctrl, "Slot already registered by another "
 321                                   "hotplug driver\n");
 322                 else
 323                         ctrl_err(ctrl, "Slot initialization failed\n");
 324                 goto err_out_release_ctlr;
 325         }
 326
 327         /* Enable events after we have setup the data structures */
 328         rc = pcie_init_notification(ctrl);
 329         if (rc) {
 330                 ctrl_err(ctrl, "Notification initialization failed\n");
 331                 goto err_out_release_ctlr;
 332         }
 333
 334         /* Check if slot is occupied */
 335         t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 336         t_slot->hpc_ops->get_adapter_status(t_slot, &value);
 337         if (value) {
 338                 if (pciehp_force)
 339                         pciehp_enable_slot(t_slot);
 340         } else {
 341                 /* Power off slot if not occupied */
 342                 if (POWER_CTRL(ctrl)) {
 343                         rc = t_slot->hpc_ops->power_off_slot(t_slot);
 344                         if (rc)
 345                                 goto err_out_free_ctrl_slot;
 346                 }
 347         }
 348
 349         return 0;
 350
 351 err_out_free_ctrl_slot:
 352         cleanup_slots(ctrl);
 353 err_out_release_ctlr:
 354         ctrl->hpc_ops->release_ctlr(ctrl);
 355 err_out_none:
 356         return -ENODEV;
 357 }
 358
 359 static void pciehp_remove (struct pcie_device *dev)
 360 {
 361         struct controller *ctrl = get_service_data(dev);
 362
 363         cleanup_slots(ctrl);
 364         ctrl->hpc_ops->release_ctlr(ctrl);
 365 }
 366
 367 #ifdef CONFIG_PM
 368 static int pciehp_suspend (struct pcie_device *dev)
 369 {
 370         dev_info(&dev->device, "%s ENTRY\n", __func__);
 371         return 0;
 372 }
 373
 374 static int pciehp_resume (struct pcie_device *dev)
 375 {
 376         dev_info(&dev->device, "%s ENTRY\n", __func__);
 377         if (pciehp_force) {
 378                 struct controller *ctrl = get_service_data(dev);
 379                 struct slot *t_slot;
 380                 u8 status;
 381
 382                 /* reinitialize the chipset's event detection logic */
 383                 pcie_enable_notification(ctrl);
 384
 385                 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 386
 387                 /* Check if slot is occupied */
 388                 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
 389                 if (status)
 390                         pciehp_enable_slot(t_slot);
 391                 else
 392                         pciehp_disable_slot(t_slot);
 393         }
 394         return 0;
 395 }
 396 #endif /* PM */
 397
 398 static struct pcie_port_service_driver hpdriver_portdrv = {
 399         .name           = PCIE_MODULE_NAME,
 400         .port_type      = PCIE_ANY_PORT,
 401         .service        = PCIE_PORT_SERVICE_HP,
 402
 403         .probe          = pciehp_probe,
 404         .remove         = pciehp_remove,
 405
 406 #ifdef  CONFIG_PM
 407         .suspend        = pciehp_suspend,
 408         .resume         = pciehp_resume,
 409 #endif  /* PM */
 410 };
 411
 412 static int __init pcied_init(void)
 413 {
 414         int retval = 0;
 415
 416         pciehp_firmware_init();
 417         retval = pcie_port_service_register(&hpdriver_portdrv);
 418         dbg("pcie_port_service_register = %d\n", retval);
 419         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 420         if (retval)
 421                 dbg("Failure to register service\n");
 422         return retval;
 423 }
 424
 425 static void __exit pcied_cleanup(void)
 426 {
 427         dbg("unload_pciehpd()\n");
 428         pcie_port_service_unregister(&hpdriver_portdrv);
 429         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 430 }
 431
 432 module_init(pcied_init);
 433 module_exit(pcied_cleanup);