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/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/pci.h>
  36 #include "pciehp.h"
  37 #include <linux/interrupt.h>
  38 #include <linux/time.h>
  39
  40 /* Global variables */
  41 int pciehp_debug;
  42 int pciehp_poll_mode;
  43 int pciehp_poll_time;
  44 int pciehp_force;
  45 struct workqueue_struct *pciehp_wq;
  46 struct workqueue_struct *pciehp_ordered_wq;
  47
  48 #define DRIVER_VERSION  "0.4"
  49 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  50 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
  51
  52 MODULE_AUTHOR(DRIVER_AUTHOR);
  53 MODULE_DESCRIPTION(DRIVER_DESC);
  54 MODULE_LICENSE("GPL");
  55
  56 module_param(pciehp_debug, bool, 0644);
  57 module_param(pciehp_poll_mode, bool, 0644);
  58 module_param(pciehp_poll_time, int, 0644);
  59 module_param(pciehp_force, bool, 0644);
  60 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  61 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  62 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  63 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
  64
  65 #define PCIE_MODULE_NAME "pciehp"
  66
  67 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  68 static int enable_slot          (struct hotplug_slot *slot);
  69 static int disable_slot         (struct hotplug_slot *slot);
  70 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  71 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  72 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  73 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  74
  75 /**
  76  * release_slot - free up the memory used by a slot
  77  * @hotplug_slot: slot to free
  78  */
  79 static void release_slot(struct hotplug_slot *hotplug_slot)
  80 {
  81         struct slot *slot = hotplug_slot->private;
  82
  83         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  84                  __func__, hotplug_slot_name(hotplug_slot));
  85
  86         kfree(hotplug_slot->ops);
  87         kfree(hotplug_slot->info);
  88         kfree(hotplug_slot);
  89 }
  90
  91 static int init_slot(struct controller *ctrl)
  92 {
  93         struct slot *slot = ctrl->slot;
  94         struct hotplug_slot *hotplug = NULL;
  95         struct hotplug_slot_info *info = NULL;
  96         struct hotplug_slot_ops *ops = NULL;
  97         char name[SLOT_NAME_SIZE];
  98         int retval = -ENOMEM;
  99
 100         hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
 101         if (!hotplug)
 102                 goto out;
 103
 104         info = kzalloc(sizeof(*info), GFP_KERNEL);
 105         if (!info)
 106                 goto out;
 107
 108         /* Setup hotplug slot ops */
 109         ops = kzalloc(sizeof(*ops), GFP_KERNEL);
 110         if (!ops)
 111                 goto out;
 112         ops->enable_slot = enable_slot;
 113         ops->disable_slot = disable_slot;
 114         ops->get_power_status = get_power_status;
 115         ops->get_adapter_status = get_adapter_status;
 116         if (MRL_SENS(ctrl))
 117                 ops->get_latch_status = get_latch_status;
 118         if (ATTN_LED(ctrl)) {
 119                 ops->get_attention_status = get_attention_status;
 120                 ops->set_attention_status = set_attention_status;
 121         }
 122
 123         /* register this slot with the hotplug pci core */
 124         hotplug->info = info;
 125         hotplug->private = slot;
 126         hotplug->release = &release_slot;
 127         hotplug->ops = ops;
 128         slot->hotplug_slot = hotplug;
 129         snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
 130
 131         ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
 132                  pci_domain_nr(ctrl->pcie->port->subordinate),
 133                  ctrl->pcie->port->subordinate->number, PSN(ctrl));
 134         retval = pci_hp_register(hotplug,
 135                                  ctrl->pcie->port->subordinate, 0, name);
 136         if (retval)
 137                 ctrl_err(ctrl,
 138                          "pci_hp_register failed with error %d\n", retval);
 139 out:
 140         if (retval) {
 141                 kfree(ops);
 142                 kfree(info);
 143                 kfree(hotplug);
 144         }
 145         return retval;
 146 }
 147
 148 static void cleanup_slot(struct controller *ctrl)
 149 {
 150         pci_hp_deregister(ctrl->slot->hotplug_slot);
 151 }
 152
 153 /*
 154  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 155  */
 156 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 157 {
 158         struct slot *slot = hotplug_slot->private;
 159
 160         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 161                   __func__, slot_name(slot));
 162
 163         return pciehp_set_attention_status(slot, status);
 164 }
 165
 166
 167 static int enable_slot(struct hotplug_slot *hotplug_slot)
 168 {
 169         struct slot *slot = hotplug_slot->private;
 170
 171         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 172                  __func__, slot_name(slot));
 173
 174         return pciehp_sysfs_enable_slot(slot);
 175 }
 176
 177
 178 static int disable_slot(struct hotplug_slot *hotplug_slot)
 179 {
 180         struct slot *slot = hotplug_slot->private;
 181
 182         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 183                   __func__, slot_name(slot));
 184
 185         return pciehp_sysfs_disable_slot(slot);
 186 }
 187
 188 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 189 {
 190         struct slot *slot = hotplug_slot->private;
 191
 192         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 193                   __func__, slot_name(slot));
 194
 195         return pciehp_get_power_status(slot, value);
 196 }
 197
 198 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 199 {
 200         struct slot *slot = hotplug_slot->private;
 201
 202         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 203                   __func__, slot_name(slot));
 204
 205         return pciehp_get_attention_status(slot, value);
 206 }
 207
 208 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 209 {
 210         struct slot *slot = hotplug_slot->private;
 211
 212         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 213                  __func__, slot_name(slot));
 214
 215         return pciehp_get_latch_status(slot, value);
 216 }
 217
 218 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 219 {
 220         struct slot *slot = hotplug_slot->private;
 221
 222         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 223                  __func__, slot_name(slot));
 224
 225         return pciehp_get_adapter_status(slot, value);
 226 }
 227
 228 static int pciehp_probe(struct pcie_device *dev)
 229 {
 230         int rc;
 231         struct controller *ctrl;
 232         struct slot *slot;
 233         u8 occupied, poweron;
 234
 235         if (pciehp_force)
 236                 dev_info(&dev->device,
 237                          "Bypassing BIOS check for pciehp use on %s\n",
 238                          pci_name(dev->port));
 239         else if (pciehp_acpi_slot_detection_check(dev->port))
 240                 goto err_out_none;
 241
 242         ctrl = pcie_init(dev);
 243         if (!ctrl) {
 244                 dev_err(&dev->device, "Controller initialization failed\n");
 245                 goto err_out_none;
 246         }
 247         set_service_data(dev, ctrl);
 248
 249         /* Setup the slot information structures */
 250         rc = init_slot(ctrl);
 251         if (rc) {
 252                 if (rc == -EBUSY)
 253                         ctrl_warn(ctrl, "Slot already registered by another "
 254                                   "hotplug driver\n");
 255                 else
 256                         ctrl_err(ctrl, "Slot initialization failed\n");
 257                 goto err_out_release_ctlr;
 258         }
 259
 260         /* Enable events after we have setup the data structures */
 261         rc = pcie_init_notification(ctrl);
 262         if (rc) {
 263                 ctrl_err(ctrl, "Notification initialization failed\n");
 264                 goto err_out_free_ctrl_slot;
 265         }
 266
 267         /* Check if slot is occupied */
 268         slot = ctrl->slot;
 269         pciehp_get_adapter_status(slot, &occupied);
 270         pciehp_get_power_status(slot, &poweron);
 271         if (occupied && pciehp_force)
 272                 pciehp_enable_slot(slot);
 273         /* If empty slot's power status is on, turn power off */
 274         if (!occupied && poweron && POWER_CTRL(ctrl))
 275                 pciehp_power_off_slot(slot);
 276
 277         return 0;
 278
 279 err_out_free_ctrl_slot:
 280         cleanup_slot(ctrl);
 281 err_out_release_ctlr:
 282         pciehp_release_ctrl(ctrl);
 283 err_out_none:
 284         return -ENODEV;
 285 }
 286
 287 static void pciehp_remove(struct pcie_device *dev)
 288 {
 289         struct controller *ctrl = get_service_data(dev);
 290
 291         cleanup_slot(ctrl);
 292         pciehp_release_ctrl(ctrl);
 293 }
 294
 295 #ifdef CONFIG_PM
 296 static int pciehp_suspend (struct pcie_device *dev)
 297 {
 298         dev_info(&dev->device, "%s ENTRY\n", __func__);
 299         return 0;
 300 }
 301
 302 static int pciehp_resume (struct pcie_device *dev)
 303 {
 304         dev_info(&dev->device, "%s ENTRY\n", __func__);
 305         if (pciehp_force) {
 306                 struct controller *ctrl = get_service_data(dev);
 307                 struct slot *slot;
 308                 u8 status;
 309
 310                 /* reinitialize the chipset's event detection logic */
 311                 pcie_enable_notification(ctrl);
 312
 313                 slot = ctrl->slot;
 314
 315                 /* Check if slot is occupied */
 316                 pciehp_get_adapter_status(slot, &status);
 317                 if (status)
 318                         pciehp_enable_slot(slot);
 319                 else
 320                         pciehp_disable_slot(slot);
 321         }
 322         return 0;
 323 }
 324 #endif /* PM */
 325
 326 static struct pcie_port_service_driver hpdriver_portdrv = {
 327         .name           = PCIE_MODULE_NAME,
 328         .port_type      = PCIE_ANY_PORT,
 329         .service        = PCIE_PORT_SERVICE_HP,
 330
 331         .probe          = pciehp_probe,
 332         .remove         = pciehp_remove,
 333
 334 #ifdef  CONFIG_PM
 335         .suspend        = pciehp_suspend,
 336         .resume         = pciehp_resume,
 337 #endif  /* PM */
 338 };
 339
 340 static int __init pcied_init(void)
 341 {
 342         int retval = 0;
 343
 344         pciehp_wq = alloc_workqueue("pciehp", 0, 0);
 345         if (!pciehp_wq)
 346                 return -ENOMEM;
 347
 348         pciehp_ordered_wq = alloc_ordered_workqueue("pciehp_ordered", 0);
 349         if (!pciehp_ordered_wq) {
 350                 destroy_workqueue(pciehp_wq);
 351                 return -ENOMEM;
 352         }
 353
 354         pciehp_firmware_init();
 355         retval = pcie_port_service_register(&hpdriver_portdrv);
 356         dbg("pcie_port_service_register = %d\n", retval);
 357         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 358         if (retval) {
 359                 destroy_workqueue(pciehp_ordered_wq);
 360                 destroy_workqueue(pciehp_wq);
 361                 dbg("Failure to register service\n");
 362         }
 363         return retval;
 364 }
 365
 366 static void __exit pcied_cleanup(void)
 367 {
 368         dbg("unload_pciehpd()\n");
 369         destroy_workqueue(pciehp_ordered_wq);
 370         destroy_workqueue(pciehp_wq);
 371         pcie_port_service_unregister(&hpdriver_portdrv);
 372         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 373 }
 374
 375 module_init(pcied_init);
 376 module_exit(pcied_cleanup);