linux/drivers/pci/hotplug/shpchp_core.c
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   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 */
  39bool shpchp_debug;
  40bool shpchp_poll_mode;
  41int shpchp_poll_time;
  42
  43#define DRIVER_VERSION  "0.4"
  44#define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  45#define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
  46
  47MODULE_AUTHOR(DRIVER_AUTHOR);
  48MODULE_DESCRIPTION(DRIVER_DESC);
  49MODULE_LICENSE("GPL");
  50
  51module_param(shpchp_debug, bool, 0644);
  52module_param(shpchp_poll_mode, bool, 0644);
  53module_param(shpchp_poll_time, int, 0644);
  54MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
  55MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
  56MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
  57
  58#define SHPC_MODULE_NAME "shpchp"
  59
  60static int set_attention_status (struct hotplug_slot *slot, u8 value);
  61static int enable_slot          (struct hotplug_slot *slot);
  62static int disable_slot         (struct hotplug_slot *slot);
  63static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  64static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  65static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  66static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  67
  68static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
  69        .set_attention_status = set_attention_status,
  70        .enable_slot =          enable_slot,
  71        .disable_slot =         disable_slot,
  72        .get_power_status =     get_power_status,
  73        .get_attention_status = get_attention_status,
  74        .get_latch_status =     get_latch_status,
  75        .get_adapter_status =   get_adapter_status,
  76};
  77
  78/**
  79 * release_slot - free up the memory used by a slot
  80 * @hotplug_slot: slot to free
  81 */
  82static void release_slot(struct hotplug_slot *hotplug_slot)
  83{
  84        struct slot *slot = hotplug_slot->private;
  85
  86        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  87                 __func__, slot_name(slot));
  88
  89        kfree(slot->hotplug_slot->info);
  90        kfree(slot->hotplug_slot);
  91        kfree(slot);
  92}
  93
  94static int init_slots(struct controller *ctrl)
  95{
  96        struct slot *slot;
  97        struct hotplug_slot *hotplug_slot;
  98        struct hotplug_slot_info *info;
  99        char name[SLOT_NAME_SIZE];
 100        int retval;
 101        int i;
 102
 103        for (i = 0; i < ctrl->num_slots; i++) {
 104                slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 105                if (!slot) {
 106                        retval = -ENOMEM;
 107                        goto error;
 108                }
 109
 110                hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 111                if (!hotplug_slot) {
 112                        retval = -ENOMEM;
 113                        goto error_slot;
 114                }
 115                slot->hotplug_slot = hotplug_slot;
 116
 117                info = kzalloc(sizeof(*info), GFP_KERNEL);
 118                if (!info) {
 119                        retval = -ENOMEM;
 120                        goto error_hpslot;
 121                }
 122                hotplug_slot->info = info;
 123
 124                slot->hp_slot = i;
 125                slot->ctrl = ctrl;
 126                slot->bus = ctrl->pci_dev->subordinate->number;
 127                slot->device = ctrl->slot_device_offset + i;
 128                slot->hpc_ops = ctrl->hpc_ops;
 129                slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
 130
 131                slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
 132                if (!slot->wq) {
 133                        retval = -ENOMEM;
 134                        goto error_info;
 135                }
 136
 137                mutex_init(&slot->lock);
 138                INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
 139
 140                /* register this slot with the hotplug pci core */
 141                hotplug_slot->private = slot;
 142                hotplug_slot->release = &release_slot;
 143                snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
 144                hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 145
 146                ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n",
 147                         pci_domain_nr(ctrl->pci_dev->subordinate),
 148                         slot->bus, slot->device, slot->hp_slot, slot->number,
 149                         ctrl->slot_device_offset);
 150                retval = pci_hp_register(slot->hotplug_slot,
 151                                ctrl->pci_dev->subordinate, slot->device, name);
 152                if (retval) {
 153                        ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 154                                 retval);
 155                        goto error_slotwq;
 156                }
 157
 158                get_power_status(hotplug_slot, &info->power_status);
 159                get_attention_status(hotplug_slot, &info->attention_status);
 160                get_latch_status(hotplug_slot, &info->latch_status);
 161                get_adapter_status(hotplug_slot, &info->adapter_status);
 162
 163                list_add(&slot->slot_list, &ctrl->slot_list);
 164        }
 165
 166        return 0;
 167error_slotwq:
 168        destroy_workqueue(slot->wq);
 169error_info:
 170        kfree(info);
 171error_hpslot:
 172        kfree(hotplug_slot);
 173error_slot:
 174        kfree(slot);
 175error:
 176        return retval;
 177}
 178
 179void cleanup_slots(struct controller *ctrl)
 180{
 181        struct list_head *tmp;
 182        struct list_head *next;
 183        struct slot *slot;
 184
 185        list_for_each_safe(tmp, next, &ctrl->slot_list) {
 186                slot = list_entry(tmp, struct slot, slot_list);
 187                list_del(&slot->slot_list);
 188                cancel_delayed_work(&slot->work);
 189                destroy_workqueue(slot->wq);
 190                pci_hp_deregister(slot->hotplug_slot);
 191        }
 192}
 193
 194/*
 195 * set_attention_status - Turns the Amber LED for a slot on, off or blink
 196 */
 197static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 198{
 199        struct slot *slot = get_slot(hotplug_slot);
 200
 201        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 202                 __func__, slot_name(slot));
 203
 204        hotplug_slot->info->attention_status = status;
 205        slot->hpc_ops->set_attention_status(slot, status);
 206
 207        return 0;
 208}
 209
 210static int enable_slot (struct hotplug_slot *hotplug_slot)
 211{
 212        struct slot *slot = get_slot(hotplug_slot);
 213
 214        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 215                 __func__, slot_name(slot));
 216
 217        return shpchp_sysfs_enable_slot(slot);
 218}
 219
 220static int disable_slot (struct hotplug_slot *hotplug_slot)
 221{
 222        struct slot *slot = get_slot(hotplug_slot);
 223
 224        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 225                 __func__, slot_name(slot));
 226
 227        return shpchp_sysfs_disable_slot(slot);
 228}
 229
 230static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 231{
 232        struct slot *slot = get_slot(hotplug_slot);
 233        int retval;
 234
 235        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 236                 __func__, slot_name(slot));
 237
 238        retval = slot->hpc_ops->get_power_status(slot, value);
 239        if (retval < 0)
 240                *value = hotplug_slot->info->power_status;
 241
 242        return 0;
 243}
 244
 245static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 246{
 247        struct slot *slot = get_slot(hotplug_slot);
 248        int retval;
 249
 250        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 251                 __func__, slot_name(slot));
 252
 253        retval = slot->hpc_ops->get_attention_status(slot, value);
 254        if (retval < 0)
 255                *value = hotplug_slot->info->attention_status;
 256
 257        return 0;
 258}
 259
 260static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 261{
 262        struct slot *slot = get_slot(hotplug_slot);
 263        int retval;
 264
 265        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 266                 __func__, slot_name(slot));
 267
 268        retval = slot->hpc_ops->get_latch_status(slot, value);
 269        if (retval < 0)
 270                *value = hotplug_slot->info->latch_status;
 271
 272        return 0;
 273}
 274
 275static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 276{
 277        struct slot *slot = get_slot(hotplug_slot);
 278        int retval;
 279
 280        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 281                 __func__, slot_name(slot));
 282
 283        retval = slot->hpc_ops->get_adapter_status(slot, value);
 284        if (retval < 0)
 285                *value = hotplug_slot->info->adapter_status;
 286
 287        return 0;
 288}
 289
 290static int is_shpc_capable(struct pci_dev *dev)
 291{
 292        if (dev->vendor == PCI_VENDOR_ID_AMD &&
 293            dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
 294                return 1;
 295        if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
 296                return 0;
 297        if (get_hp_hw_control_from_firmware(dev))
 298                return 0;
 299        return 1;
 300}
 301
 302static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 303{
 304        int rc;
 305        struct controller *ctrl;
 306
 307        if (!is_shpc_capable(pdev))
 308                return -ENODEV;
 309
 310        ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 311        if (!ctrl) {
 312                dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
 313                goto err_out_none;
 314        }
 315        INIT_LIST_HEAD(&ctrl->slot_list);
 316
 317        rc = shpc_init(ctrl, pdev);
 318        if (rc) {
 319                ctrl_dbg(ctrl, "Controller initialization failed\n");
 320                goto err_out_free_ctrl;
 321        }
 322
 323        pci_set_drvdata(pdev, ctrl);
 324
 325        /* Setup the slot information structures */
 326        rc = init_slots(ctrl);
 327        if (rc) {
 328                ctrl_err(ctrl, "Slot initialization failed\n");
 329                goto err_out_release_ctlr;
 330        }
 331
 332        rc = shpchp_create_ctrl_files(ctrl);
 333        if (rc)
 334                goto err_cleanup_slots;
 335
 336        return 0;
 337
 338err_cleanup_slots:
 339        cleanup_slots(ctrl);
 340err_out_release_ctlr:
 341        ctrl->hpc_ops->release_ctlr(ctrl);
 342err_out_free_ctrl:
 343        kfree(ctrl);
 344err_out_none:
 345        return -ENODEV;
 346}
 347
 348static void shpc_remove(struct pci_dev *dev)
 349{
 350        struct controller *ctrl = pci_get_drvdata(dev);
 351
 352        shpchp_remove_ctrl_files(ctrl);
 353        ctrl->hpc_ops->release_ctlr(ctrl);
 354        kfree(ctrl);
 355}
 356
 357static struct pci_device_id shpcd_pci_tbl[] = {
 358        {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 359        { /* end: all zeroes */ }
 360};
 361MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 362
 363static struct pci_driver shpc_driver = {
 364        .name =         SHPC_MODULE_NAME,
 365        .id_table =     shpcd_pci_tbl,
 366        .probe =        shpc_probe,
 367        .remove =       shpc_remove,
 368};
 369
 370static int __init shpcd_init(void)
 371{
 372        int retval;
 373
 374        retval = pci_register_driver(&shpc_driver);
 375        dbg("%s: pci_register_driver = %d\n", __func__, retval);
 376        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 377
 378        return retval;
 379}
 380
 381static void __exit shpcd_cleanup(void)
 382{
 383        dbg("unload_shpchpd()\n");
 384        pci_unregister_driver(&shpc_driver);
 385        info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 386}
 387
 388module_init(shpcd_init);
 389module_exit(shpcd_cleanup);
 390
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