linux/drivers/pci/hotplug/pciehp_core.c
<<
>>
Prefs
   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 */
  41bool pciehp_debug;
  42bool pciehp_poll_mode;
  43int pciehp_poll_time;
  44static bool pciehp_force;
  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
  50MODULE_AUTHOR(DRIVER_AUTHOR);
  51MODULE_DESCRIPTION(DRIVER_DESC);
  52MODULE_LICENSE("GPL");
  53
  54module_param(pciehp_debug, bool, 0644);
  55module_param(pciehp_poll_mode, bool, 0644);
  56module_param(pciehp_poll_time, int, 0644);
  57module_param(pciehp_force, bool, 0644);
  58MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  59MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  60MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  61MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
  62
  63#define PCIE_MODULE_NAME "pciehp"
  64
  65static int set_attention_status (struct hotplug_slot *slot, u8 value);
  66static int enable_slot          (struct hotplug_slot *slot);
  67static int disable_slot         (struct hotplug_slot *slot);
  68static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  69static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  70static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  71static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  72static int reset_slot           (struct hotplug_slot *slot, int probe);
  73
  74/**
  75 * release_slot - free up the memory used by a slot
  76 * @hotplug_slot: slot to free
  77 */
  78static void release_slot(struct hotplug_slot *hotplug_slot)
  79{
  80        struct slot *slot = hotplug_slot->private;
  81
  82        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  83                 __func__, hotplug_slot_name(hotplug_slot));
  84
  85        kfree(hotplug_slot->ops);
  86        kfree(hotplug_slot->info);
  87        kfree(hotplug_slot);
  88}
  89
  90static int init_slot(struct controller *ctrl)
  91{
  92        struct slot *slot = ctrl->slot;
  93        struct hotplug_slot *hotplug = NULL;
  94        struct hotplug_slot_info *info = NULL;
  95        struct hotplug_slot_ops *ops = NULL;
  96        char name[SLOT_NAME_SIZE];
  97        int retval = -ENOMEM;
  98
  99        hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
 100        if (!hotplug)
 101                goto out;
 102
 103        info = kzalloc(sizeof(*info), GFP_KERNEL);
 104        if (!info)
 105                goto out;
 106
 107        /* Setup hotplug slot ops */
 108        ops = kzalloc(sizeof(*ops), GFP_KERNEL);
 109        if (!ops)
 110                goto out;
 111        ops->enable_slot = enable_slot;
 112        ops->disable_slot = disable_slot;
 113        ops->get_power_status = get_power_status;
 114        ops->get_adapter_status = get_adapter_status;
 115        ops->reset_slot = reset_slot;
 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);
 139out:
 140        if (retval) {
 141                kfree(ops);
 142                kfree(info);
 143                kfree(hotplug);
 144        }
 145        return retval;
 146}
 147
 148static 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 */
 156static 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        pciehp_set_attention_status(slot, status);
 164        return 0;
 165}
 166
 167
 168static int enable_slot(struct hotplug_slot *hotplug_slot)
 169{
 170        struct slot *slot = hotplug_slot->private;
 171
 172        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 173                 __func__, slot_name(slot));
 174
 175        return pciehp_sysfs_enable_slot(slot);
 176}
 177
 178
 179static int disable_slot(struct hotplug_slot *hotplug_slot)
 180{
 181        struct slot *slot = hotplug_slot->private;
 182
 183        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 184                  __func__, slot_name(slot));
 185
 186        return pciehp_sysfs_disable_slot(slot);
 187}
 188
 189static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 190{
 191        struct slot *slot = hotplug_slot->private;
 192
 193        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 194                  __func__, slot_name(slot));
 195
 196        pciehp_get_power_status(slot, value);
 197        return 0;
 198}
 199
 200static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 201{
 202        struct slot *slot = hotplug_slot->private;
 203
 204        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 205                  __func__, slot_name(slot));
 206
 207        pciehp_get_attention_status(slot, value);
 208        return 0;
 209}
 210
 211static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 212{
 213        struct slot *slot = hotplug_slot->private;
 214
 215        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 216                 __func__, slot_name(slot));
 217
 218        pciehp_get_latch_status(slot, value);
 219        return 0;
 220}
 221
 222static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 223{
 224        struct slot *slot = hotplug_slot->private;
 225
 226        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 227                 __func__, slot_name(slot));
 228
 229        pciehp_get_adapter_status(slot, value);
 230        return 0;
 231}
 232
 233static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
 234{
 235        struct slot *slot = hotplug_slot->private;
 236
 237        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 238                 __func__, slot_name(slot));
 239
 240        return pciehp_reset_slot(slot, probe);
 241}
 242
 243static int pciehp_probe(struct pcie_device *dev)
 244{
 245        int rc;
 246        struct controller *ctrl;
 247        struct slot *slot;
 248        u8 occupied, poweron;
 249
 250        if (pciehp_force)
 251                dev_info(&dev->device,
 252                         "Bypassing BIOS check for pciehp use on %s\n",
 253                         pci_name(dev->port));
 254        else if (pciehp_acpi_slot_detection_check(dev->port))
 255                goto err_out_none;
 256
 257        ctrl = pcie_init(dev);
 258        if (!ctrl) {
 259                dev_err(&dev->device, "Controller initialization failed\n");
 260                goto err_out_none;
 261        }
 262        set_service_data(dev, ctrl);
 263
 264        /* Setup the slot information structures */
 265        rc = init_slot(ctrl);
 266        if (rc) {
 267                if (rc == -EBUSY)
 268                        ctrl_warn(ctrl, "Slot already registered by another "
 269                                  "hotplug driver\n");
 270                else
 271                        ctrl_err(ctrl, "Slot initialization failed\n");
 272                goto err_out_release_ctlr;
 273        }
 274
 275        /* Enable events after we have setup the data structures */
 276        rc = pcie_init_notification(ctrl);
 277        if (rc) {
 278                ctrl_err(ctrl, "Notification initialization failed\n");
 279                goto err_out_free_ctrl_slot;
 280        }
 281
 282        /* Check if slot is occupied */
 283        slot = ctrl->slot;
 284        pciehp_get_adapter_status(slot, &occupied);
 285        pciehp_get_power_status(slot, &poweron);
 286        if (occupied && pciehp_force)
 287                pciehp_enable_slot(slot);
 288        /* If empty slot's power status is on, turn power off */
 289        if (!occupied && poweron && POWER_CTRL(ctrl))
 290                pciehp_power_off_slot(slot);
 291
 292        return 0;
 293
 294err_out_free_ctrl_slot:
 295        cleanup_slot(ctrl);
 296err_out_release_ctlr:
 297        pciehp_release_ctrl(ctrl);
 298err_out_none:
 299        return -ENODEV;
 300}
 301
 302static void pciehp_remove(struct pcie_device *dev)
 303{
 304        struct controller *ctrl = get_service_data(dev);
 305
 306        cleanup_slot(ctrl);
 307        pciehp_release_ctrl(ctrl);
 308}
 309
 310#ifdef CONFIG_PM
 311static int pciehp_suspend (struct pcie_device *dev)
 312{
 313        return 0;
 314}
 315
 316static int pciehp_resume (struct pcie_device *dev)
 317{
 318        struct controller *ctrl;
 319        struct slot *slot;
 320        u8 status;
 321
 322        ctrl = get_service_data(dev);
 323
 324        /* reinitialize the chipset's event detection logic */
 325        pcie_enable_notification(ctrl);
 326
 327        slot = ctrl->slot;
 328
 329        /* Check if slot is occupied */
 330        pciehp_get_adapter_status(slot, &status);
 331        if (status)
 332                pciehp_enable_slot(slot);
 333        else
 334                pciehp_disable_slot(slot);
 335        return 0;
 336}
 337#endif /* PM */
 338
 339static struct pcie_port_service_driver hpdriver_portdrv = {
 340        .name           = PCIE_MODULE_NAME,
 341        .port_type      = PCIE_ANY_PORT,
 342        .service        = PCIE_PORT_SERVICE_HP,
 343
 344        .probe          = pciehp_probe,
 345        .remove         = pciehp_remove,
 346
 347#ifdef  CONFIG_PM
 348        .suspend        = pciehp_suspend,
 349        .resume         = pciehp_resume,
 350#endif  /* PM */
 351};
 352
 353static int __init pcied_init(void)
 354{
 355        int retval = 0;
 356
 357        pciehp_firmware_init();
 358        retval = pcie_port_service_register(&hpdriver_portdrv);
 359        dbg("pcie_port_service_register = %d\n", retval);
 360        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 361        if (retval)
 362                dbg("Failure to register service\n");
 363
 364        return retval;
 365}
 366
 367static void __exit pcied_cleanup(void)
 368{
 369        dbg("unload_pciehpd()\n");
 370        pcie_port_service_unregister(&hpdriver_portdrv);
 371        info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 372}
 373
 374module_init(pcied_init);
 375module_exit(pcied_cleanup);
 376
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.