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;
  42struct workqueue_struct *shpchp_wq;
  43struct workqueue_struct *shpchp_ordered_wq;
  44
  45#define DRIVER_VERSION  "0.4"
  46#define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  47#define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
  48
  49MODULE_AUTHOR(DRIVER_AUTHOR);
  50MODULE_DESCRIPTION(DRIVER_DESC);
  51MODULE_LICENSE("GPL");
  52
  53module_param(shpchp_debug, bool, 0644);
  54module_param(shpchp_poll_mode, bool, 0644);
  55module_param(shpchp_poll_time, int, 0644);
  56MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
  57MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
  58MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
  59
  60#define SHPC_MODULE_NAME "shpchp"
  61
  62static int set_attention_status (struct hotplug_slot *slot, u8 value);
  63static int enable_slot          (struct hotplug_slot *slot);
  64static int disable_slot         (struct hotplug_slot *slot);
  65static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  66static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  67static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  68static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  69
  70static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
  71        .set_attention_status = set_attention_status,
  72        .enable_slot =          enable_slot,
  73        .disable_slot =         disable_slot,
  74        .get_power_status =     get_power_status,
  75        .get_attention_status = get_attention_status,
  76        .get_latch_status =     get_latch_status,
  77        .get_adapter_status =   get_adapter_status,
  78};
  79
  80/**
  81 * release_slot - free up the memory used by a slot
  82 * @hotplug_slot: slot to free
  83 */
  84static void release_slot(struct hotplug_slot *hotplug_slot)
  85{
  86        struct slot *slot = hotplug_slot->private;
  87
  88        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
  89                 __func__, slot_name(slot));
  90
  91        kfree(slot->hotplug_slot->info);
  92        kfree(slot->hotplug_slot);
  93        kfree(slot);
  94}
  95
  96static int init_slots(struct controller *ctrl)
  97{
  98        struct slot *slot;
  99        struct hotplug_slot *hotplug_slot;
 100        struct hotplug_slot_info *info;
 101        char name[SLOT_NAME_SIZE];
 102        int retval = -ENOMEM;
 103        int i;
 104
 105        for (i = 0; i < ctrl->num_slots; i++) {
 106                slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 107                if (!slot)
 108                        goto error;
 109
 110                hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 111                if (!hotplug_slot)
 112                        goto error_slot;
 113                slot->hotplug_slot = hotplug_slot;
 114
 115                info = kzalloc(sizeof(*info), GFP_KERNEL);
 116                if (!info)
 117                        goto error_hpslot;
 118                hotplug_slot->info = info;
 119
 120                slot->hp_slot = i;
 121                slot->ctrl = ctrl;
 122                slot->bus = ctrl->pci_dev->subordinate->number;
 123                slot->device = ctrl->slot_device_offset + i;
 124                slot->hpc_ops = ctrl->hpc_ops;
 125                slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
 126                mutex_init(&slot->lock);
 127                INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
 128
 129                /* register this slot with the hotplug pci core */
 130                hotplug_slot->private = slot;
 131                hotplug_slot->release = &release_slot;
 132                snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
 133                hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 134
 135                ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
 136                         "hp_slot=%x sun=%x slot_device_offset=%x\n",
 137                         pci_domain_nr(ctrl->pci_dev->subordinate),
 138                         slot->bus, slot->device, slot->hp_slot, slot->number,
 139                         ctrl->slot_device_offset);
 140                retval = pci_hp_register(slot->hotplug_slot,
 141                                ctrl->pci_dev->subordinate, slot->device, name);
 142                if (retval) {
 143                        ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 144                                 retval);
 145                        goto error_info;
 146                }
 147
 148                get_power_status(hotplug_slot, &info->power_status);
 149                get_attention_status(hotplug_slot, &info->attention_status);
 150                get_latch_status(hotplug_slot, &info->latch_status);
 151                get_adapter_status(hotplug_slot, &info->adapter_status);
 152
 153                list_add(&slot->slot_list, &ctrl->slot_list);
 154        }
 155
 156        return 0;
 157error_info:
 158        kfree(info);
 159error_hpslot:
 160        kfree(hotplug_slot);
 161error_slot:
 162        kfree(slot);
 163error:
 164        return retval;
 165}
 166
 167void cleanup_slots(struct controller *ctrl)
 168{
 169        struct list_head *tmp;
 170        struct list_head *next;
 171        struct slot *slot;
 172
 173        list_for_each_safe(tmp, next, &ctrl->slot_list) {
 174                slot = list_entry(tmp, struct slot, slot_list);
 175                list_del(&slot->slot_list);
 176                cancel_delayed_work(&slot->work);
 177                flush_workqueue(shpchp_wq);
 178                flush_workqueue(shpchp_ordered_wq);
 179                pci_hp_deregister(slot->hotplug_slot);
 180        }
 181}
 182
 183/*
 184 * set_attention_status - Turns the Amber LED for a slot on, off or blink
 185 */
 186static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
 187{
 188        struct slot *slot = get_slot(hotplug_slot);
 189
 190        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 191                 __func__, slot_name(slot));
 192
 193        hotplug_slot->info->attention_status = status;
 194        slot->hpc_ops->set_attention_status(slot, status);
 195
 196        return 0;
 197}
 198
 199static int enable_slot (struct hotplug_slot *hotplug_slot)
 200{
 201        struct slot *slot = get_slot(hotplug_slot);
 202
 203        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 204                 __func__, slot_name(slot));
 205
 206        return shpchp_sysfs_enable_slot(slot);
 207}
 208
 209static int disable_slot (struct hotplug_slot *hotplug_slot)
 210{
 211        struct slot *slot = get_slot(hotplug_slot);
 212
 213        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 214                 __func__, slot_name(slot));
 215
 216        return shpchp_sysfs_disable_slot(slot);
 217}
 218
 219static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
 220{
 221        struct slot *slot = get_slot(hotplug_slot);
 222        int retval;
 223
 224        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 225                 __func__, slot_name(slot));
 226
 227        retval = slot->hpc_ops->get_power_status(slot, value);
 228        if (retval < 0)
 229                *value = hotplug_slot->info->power_status;
 230
 231        return 0;
 232}
 233
 234static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
 235{
 236        struct slot *slot = get_slot(hotplug_slot);
 237        int retval;
 238
 239        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 240                 __func__, slot_name(slot));
 241
 242        retval = slot->hpc_ops->get_attention_status(slot, value);
 243        if (retval < 0)
 244                *value = hotplug_slot->info->attention_status;
 245
 246        return 0;
 247}
 248
 249static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
 250{
 251        struct slot *slot = get_slot(hotplug_slot);
 252        int retval;
 253
 254        ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 255                 __func__, slot_name(slot));
 256
 257        retval = slot->hpc_ops->get_latch_status(slot, value);
 258        if (retval < 0)
 259                *value = hotplug_slot->info->latch_status;
 260
 261        return 0;
 262}
 263
 264static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
 265{
 266        struct slot *slot = get_slot(hotplug_slot);
 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_adapter_status(slot, value);
 273        if (retval < 0)
 274                *value = hotplug_slot->info->adapter_status;
 275
 276        return 0;
 277}
 278
 279static int is_shpc_capable(struct pci_dev *dev)
 280{
 281        if (dev->vendor == PCI_VENDOR_ID_AMD &&
 282            dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
 283                return 1;
 284        if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
 285                return 0;
 286        if (get_hp_hw_control_from_firmware(dev))
 287                return 0;
 288        return 1;
 289}
 290
 291static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 292{
 293        int rc;
 294        struct controller *ctrl;
 295
 296        if (!is_shpc_capable(pdev))
 297                return -ENODEV;
 298
 299        ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 300        if (!ctrl) {
 301                dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
 302                goto err_out_none;
 303        }
 304        INIT_LIST_HEAD(&ctrl->slot_list);
 305
 306        rc = shpc_init(ctrl, pdev);
 307        if (rc) {
 308                ctrl_dbg(ctrl, "Controller initialization failed\n");
 309                goto err_out_free_ctrl;
 310        }
 311
 312        pci_set_drvdata(pdev, ctrl);
 313
 314        /* Setup the slot information structures */
 315        rc = init_slots(ctrl);
 316        if (rc) {
 317                ctrl_err(ctrl, "Slot initialization failed\n");
 318                goto err_out_release_ctlr;
 319        }
 320
 321        rc = shpchp_create_ctrl_files(ctrl);
 322        if (rc)
 323                goto err_cleanup_slots;
 324
 325        return 0;
 326
 327err_cleanup_slots:
 328        cleanup_slots(ctrl);
 329err_out_release_ctlr:
 330        ctrl->hpc_ops->release_ctlr(ctrl);
 331err_out_free_ctrl:
 332        kfree(ctrl);
 333err_out_none:
 334        return -ENODEV;
 335}
 336
 337static void shpc_remove(struct pci_dev *dev)
 338{
 339        struct controller *ctrl = pci_get_drvdata(dev);
 340
 341        shpchp_remove_ctrl_files(ctrl);
 342        ctrl->hpc_ops->release_ctlr(ctrl);
 343        kfree(ctrl);
 344}
 345
 346static struct pci_device_id shpcd_pci_tbl[] = {
 347        {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 348        { /* end: all zeroes */ }
 349};
 350MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
 351
 352static struct pci_driver shpc_driver = {
 353        .name =         SHPC_MODULE_NAME,
 354        .id_table =     shpcd_pci_tbl,
 355        .probe =        shpc_probe,
 356        .remove =       shpc_remove,
 357};
 358
 359static int __init shpcd_init(void)
 360{
 361        int retval = 0;
 362
 363        shpchp_wq = alloc_ordered_workqueue("shpchp", 0);
 364        if (!shpchp_wq)
 365                return -ENOMEM;
 366
 367        shpchp_ordered_wq = alloc_ordered_workqueue("shpchp_ordered", 0);
 368        if (!shpchp_ordered_wq) {
 369                destroy_workqueue(shpchp_wq);
 370                return -ENOMEM;
 371        }
 372
 373        retval = pci_register_driver(&shpc_driver);
 374        dbg("%s: pci_register_driver = %d\n", __func__, retval);
 375        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 376        if (retval) {
 377                destroy_workqueue(shpchp_ordered_wq);
 378                destroy_workqueue(shpchp_wq);
 379        }
 380        return retval;
 381}
 382
 383static void __exit shpcd_cleanup(void)
 384{
 385        dbg("unload_shpchpd()\n");
 386        pci_unregister_driver(&shpc_driver);
 387        destroy_workqueue(shpchp_ordered_wq);
 388        destroy_workqueue(shpchp_wq);
 389        info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 390}
 391
 392module_init(shpcd_init);
 393module_exit(shpcd_cleanup);
 394