linux/drivers/pci/hotplug/pciehp_core.c
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   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
 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        ops->reset_slot = reset_slot;
 117        if (MRL_SENS(ctrl))
 118                ops->get_latch_status = get_latch_status;
 119        if (ATTN_LED(ctrl)) {
 120                ops->get_attention_status = get_attention_status;
 121                ops->set_attention_status = set_attention_status;
 122        }
 123
 124        /* register this slot with the hotplug pci core */
 125        hotplug->info = info;
 126        hotplug->private = slot;
 127        hotplug->release = &release_slot;
 128        hotplug->ops = ops;
 129        slot->hotplug_slot = hotplug;
 130        snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
 131
 132        ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
 133                 pci_domain_nr(ctrl->pcie->port->subordinate),
 134                 ctrl->pcie->port->subordinate->number, PSN(ctrl));
 135        retval = pci_hp_register(hotplug,
 136                                 ctrl->pcie->port->subordinate, 0, name);
 137        if (retval)
 138                ctrl_err(ctrl,
 139                         "pci_hp_register failed with error %d\n", retval);
 140out:
 141        if (retval) {
 142                kfree(ops);
 143                kfree(info);
 144                kfree(hotplug);
 145        }
 146        return retval;
 147}
 148
 149static void cleanup_slot(struct controller *ctrl)
 150{
 151        pci_hp_deregister(ctrl->slot->hotplug_slot);
 152}
 153
 154/*
 155 * set_attention_status - Turns the Amber LED for a slot on, off or blink
 156 */
 157static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 158{
 159        struct slot *slot = hotplug_slot->private;
 160
 161        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 162                  __func__, slot_name(slot));
 163
 164        pciehp_set_attention_status(slot, status);
 165        return 0;
 166}
 167
 168
 169static int enable_slot(struct hotplug_slot *hotplug_slot)
 170{
 171        struct slot *slot = hotplug_slot->private;
 172
 173        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 174                 __func__, slot_name(slot));
 175
 176        return pciehp_sysfs_enable_slot(slot);
 177}
 178
 179
 180static int disable_slot(struct hotplug_slot *hotplug_slot)
 181{
 182        struct slot *slot = hotplug_slot->private;
 183
 184        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 185                  __func__, slot_name(slot));
 186
 187        return pciehp_sysfs_disable_slot(slot);
 188}
 189
 190static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 191{
 192        struct slot *slot = hotplug_slot->private;
 193
 194        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 195                  __func__, slot_name(slot));
 196
 197        pciehp_get_power_status(slot, value);
 198        return 0;
 199}
 200
 201static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 202{
 203        struct slot *slot = hotplug_slot->private;
 204
 205        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 206                  __func__, slot_name(slot));
 207
 208        pciehp_get_attention_status(slot, value);
 209        return 0;
 210}
 211
 212static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 213{
 214        struct slot *slot = hotplug_slot->private;
 215
 216        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 217                 __func__, slot_name(slot));
 218
 219        pciehp_get_latch_status(slot, value);
 220        return 0;
 221}
 222
 223static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 224{
 225        struct slot *slot = hotplug_slot->private;
 226
 227        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 228                 __func__, slot_name(slot));
 229
 230        pciehp_get_adapter_status(slot, value);
 231        return 0;
 232}
 233
 234static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
 235{
 236        struct slot *slot = hotplug_slot->private;
 237
 238        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 239                 __func__, slot_name(slot));
 240
 241        return pciehp_reset_slot(slot, probe);
 242}
 243
 244static int pciehp_probe(struct pcie_device *dev)
 245{
 246        int rc;
 247        struct controller *ctrl;
 248        struct slot *slot;
 249        u8 occupied, poweron;
 250
 251        if (pciehp_force)
 252                dev_info(&dev->device,
 253                         "Bypassing BIOS check for pciehp use on %s\n",
 254                         pci_name(dev->port));
 255        else if (pciehp_acpi_slot_detection_check(dev->port))
 256                goto err_out_none;
 257
 258        if (!dev->port->subordinate) {
 259                /* Can happen if we run out of bus numbers during probe */
 260                dev_err(&dev->device,
 261                        "Hotplug bridge without secondary bus, ignoring\n");
 262                goto err_out_none;
 263        }
 264
 265        ctrl = pcie_init(dev);
 266        if (!ctrl) {
 267                dev_err(&dev->device, "Controller initialization failed\n");
 268                goto err_out_none;
 269        }
 270        set_service_data(dev, ctrl);
 271
 272        /* Setup the slot information structures */
 273        rc = init_slot(ctrl);
 274        if (rc) {
 275                if (rc == -EBUSY)
 276                        ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
 277                else
 278                        ctrl_err(ctrl, "Slot initialization failed\n");
 279                goto err_out_release_ctlr;
 280        }
 281
 282        /* Enable events after we have setup the data structures */
 283        rc = pcie_init_notification(ctrl);
 284        if (rc) {
 285                ctrl_err(ctrl, "Notification initialization failed\n");
 286                goto err_out_free_ctrl_slot;
 287        }
 288
 289        /* Check if slot is occupied */
 290        slot = ctrl->slot;
 291        pciehp_get_adapter_status(slot, &occupied);
 292        pciehp_get_power_status(slot, &poweron);
 293        if (occupied && pciehp_force) {
 294                mutex_lock(&slot->hotplug_lock);
 295                pciehp_enable_slot(slot);
 296                mutex_unlock(&slot->hotplug_lock);
 297        }
 298        /* If empty slot's power status is on, turn power off */
 299        if (!occupied && poweron && POWER_CTRL(ctrl))
 300                pciehp_power_off_slot(slot);
 301
 302        return 0;
 303
 304err_out_free_ctrl_slot:
 305        cleanup_slot(ctrl);
 306err_out_release_ctlr:
 307        pciehp_release_ctrl(ctrl);
 308err_out_none:
 309        return -ENODEV;
 310}
 311
 312static void pciehp_remove(struct pcie_device *dev)
 313{
 314        struct controller *ctrl = get_service_data(dev);
 315
 316        cleanup_slot(ctrl);
 317        pciehp_release_ctrl(ctrl);
 318}
 319
 320#ifdef CONFIG_PM
 321static int pciehp_suspend(struct pcie_device *dev)
 322{
 323        return 0;
 324}
 325
 326static int pciehp_resume(struct pcie_device *dev)
 327{
 328        struct controller *ctrl;
 329        struct slot *slot;
 330        u8 status;
 331
 332        ctrl = get_service_data(dev);
 333
 334        /* reinitialize the chipset's event detection logic */
 335        pcie_enable_notification(ctrl);
 336
 337        slot = ctrl->slot;
 338
 339        /* Check if slot is occupied */
 340        pciehp_get_adapter_status(slot, &status);
 341        mutex_lock(&slot->hotplug_lock);
 342        if (status)
 343                pciehp_enable_slot(slot);
 344        else
 345                pciehp_disable_slot(slot);
 346        mutex_unlock(&slot->hotplug_lock);
 347        return 0;
 348}
 349#endif /* PM */
 350
 351static struct pcie_port_service_driver hpdriver_portdrv = {
 352        .name           = PCIE_MODULE_NAME,
 353        .port_type      = PCIE_ANY_PORT,
 354        .service        = PCIE_PORT_SERVICE_HP,
 355
 356        .probe          = pciehp_probe,
 357        .remove         = pciehp_remove,
 358
 359#ifdef  CONFIG_PM
 360        .suspend        = pciehp_suspend,
 361        .resume         = pciehp_resume,
 362#endif  /* PM */
 363};
 364
 365static int __init pcied_init(void)
 366{
 367        int retval = 0;
 368
 369        pciehp_firmware_init();
 370        retval = pcie_port_service_register(&hpdriver_portdrv);
 371        dbg("pcie_port_service_register = %d\n", retval);
 372        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 373        if (retval)
 374                dbg("Failure to register service\n");
 375
 376        return retval;
 377}
 378
 379static void __exit pcied_cleanup(void)
 380{
 381        dbg("unload_pciehpd()\n");
 382        pcie_port_service_unregister(&hpdriver_portdrv);
 383        info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 384}
 385
 386module_init(pcied_init);
 387module_exit(pcied_cleanup);
 388
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