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  * Authors:
  29  *   Dan Zink <dan.zink@compaq.com>
  30  *   Greg Kroah-Hartman <greg@kroah.com>
  31  *   Dely Sy <dely.l.sy@intel.com>"
  32  */
  33
  34 #include <linux/moduleparam.h>
  35 #include <linux/kernel.h>
  36 #include <linux/slab.h>
  37 #include <linux/types.h>
  38 #include <linux/pci.h>
  39 #include "pciehp.h"
  40 #include <linux/interrupt.h>
  41 #include <linux/time.h>
  42
  43 /* Global variables */
  44 bool pciehp_debug;
  45 bool pciehp_poll_mode;
  46 int pciehp_poll_time;
  47 static bool pciehp_force;
  48
  49 /*
  50  * not really modular, but the easiest way to keep compat with existing
  51  * bootargs behaviour is to continue using module_param here.
  52  */
  53 module_param(pciehp_debug, bool, 0644);
  54 module_param(pciehp_poll_mode, bool, 0644);
  55 module_param(pciehp_poll_time, int, 0644);
  56 module_param(pciehp_force, bool, 0644);
  57 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  58 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  59 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  60 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
  61
  62 #define PCIE_MODULE_NAME "pciehp"
  63
  64 static int set_attention_status(struct hotplug_slot *slot, u8 value);
  65 static int enable_slot(struct hotplug_slot *slot);
  66 static int disable_slot(struct hotplug_slot *slot);
  67 static int get_power_status(struct hotplug_slot *slot, u8 *value);
  68 static int get_attention_status(struct hotplug_slot *slot, u8 *value);
  69 static int get_latch_status(struct hotplug_slot *slot, u8 *value);
  70 static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
  71 static int reset_slot(struct hotplug_slot *slot, int probe);
  72
  73 /**
  74  * release_slot - free up the memory used by a slot
  75  * @hotplug_slot: slot to free
  76  */
  77 static void release_slot(struct hotplug_slot *hotplug_slot)
  78 {
  79         kfree(hotplug_slot->ops);
  80         kfree(hotplug_slot->info);
  81         kfree(hotplug_slot);
  82 }
  83
  84 static int init_slot(struct controller *ctrl)
  85 {
  86         struct slot *slot = ctrl->slot;
  87         struct hotplug_slot *hotplug = NULL;
  88         struct hotplug_slot_info *info = NULL;
  89         struct hotplug_slot_ops *ops = NULL;
  90         char name[SLOT_NAME_SIZE];
  91         int retval = -ENOMEM;
  92
  93         hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
  94         if (!hotplug)
  95                 goto out;
  96
  97         info = kzalloc(sizeof(*info), GFP_KERNEL);
  98         if (!info)
  99                 goto out;
 100
 101         /* Setup hotplug slot ops */
 102         ops = kzalloc(sizeof(*ops), GFP_KERNEL);
 103         if (!ops)
 104                 goto out;
 105
 106         ops->enable_slot = enable_slot;
 107         ops->disable_slot = disable_slot;
 108         ops->get_power_status = get_power_status;
 109         ops->get_adapter_status = get_adapter_status;
 110         ops->reset_slot = reset_slot;
 111         if (MRL_SENS(ctrl))
 112                 ops->get_latch_status = get_latch_status;
 113         if (ATTN_LED(ctrl)) {
 114                 ops->get_attention_status = get_attention_status;
 115                 ops->set_attention_status = set_attention_status;
 116         } else if (ctrl->pcie->port->hotplug_user_indicators) {
 117                 ops->get_attention_status = pciehp_get_raw_indicator_status;
 118                 ops->set_attention_status = pciehp_set_raw_indicator_status;
 119         }
 120
 121         /* register this slot with the hotplug pci core */
 122         hotplug->info = info;
 123         hotplug->private = slot;
 124         hotplug->release = &release_slot;
 125         hotplug->ops = ops;
 126         slot->hotplug_slot = hotplug;
 127         snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
 128
 129         retval = pci_hp_register(hotplug,
 130                                  ctrl->pcie->port->subordinate, 0, name);
 131         if (retval)
 132                 ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval);
 133 out:
 134         if (retval) {
 135                 kfree(ops);
 136                 kfree(info);
 137                 kfree(hotplug);
 138         }
 139         return retval;
 140 }
 141
 142 static void cleanup_slot(struct controller *ctrl)
 143 {
 144         pci_hp_deregister(ctrl->slot->hotplug_slot);
 145 }
 146
 147 /*
 148  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 149  */
 150 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 151 {
 152         struct slot *slot = hotplug_slot->private;
 153
 154         pciehp_set_attention_status(slot, status);
 155         return 0;
 156 }
 157
 158
 159 static int enable_slot(struct hotplug_slot *hotplug_slot)
 160 {
 161         struct slot *slot = hotplug_slot->private;
 162
 163         return pciehp_sysfs_enable_slot(slot);
 164 }
 165
 166
 167 static int disable_slot(struct hotplug_slot *hotplug_slot)
 168 {
 169         struct slot *slot = hotplug_slot->private;
 170
 171         return pciehp_sysfs_disable_slot(slot);
 172 }
 173
 174 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 175 {
 176         struct slot *slot = hotplug_slot->private;
 177
 178         pciehp_get_power_status(slot, value);
 179         return 0;
 180 }
 181
 182 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 183 {
 184         struct slot *slot = hotplug_slot->private;
 185
 186         pciehp_get_attention_status(slot, value);
 187         return 0;
 188 }
 189
 190 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 191 {
 192         struct slot *slot = hotplug_slot->private;
 193
 194         pciehp_get_latch_status(slot, value);
 195         return 0;
 196 }
 197
 198 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 199 {
 200         struct slot *slot = hotplug_slot->private;
 201
 202         pciehp_get_adapter_status(slot, value);
 203         return 0;
 204 }
 205
 206 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
 207 {
 208         struct slot *slot = hotplug_slot->private;
 209
 210         return pciehp_reset_slot(slot, probe);
 211 }
 212
 213 static int pciehp_probe(struct pcie_device *dev)
 214 {
 215         int rc;
 216         struct controller *ctrl;
 217         struct slot *slot;
 218         u8 occupied, poweron;
 219
 220         /* If this is not a "hotplug" service, we have no business here. */
 221         if (dev->service != PCIE_PORT_SERVICE_HP)
 222                 return -ENODEV;
 223
 224         if (!dev->port->subordinate) {
 225                 /* Can happen if we run out of bus numbers during probe */
 226                 dev_err(&dev->device,
 227                         "Hotplug bridge without secondary bus, ignoring\n");
 228                 return -ENODEV;
 229         }
 230
 231         ctrl = pcie_init(dev);
 232         if (!ctrl) {
 233                 dev_err(&dev->device, "Controller initialization failed\n");
 234                 return -ENODEV;
 235         }
 236         set_service_data(dev, ctrl);
 237
 238         /* Setup the slot information structures */
 239         rc = init_slot(ctrl);
 240         if (rc) {
 241                 if (rc == -EBUSY)
 242                         ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
 243                 else
 244                         ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
 245                 goto err_out_release_ctlr;
 246         }
 247
 248         /* Enable events after we have setup the data structures */
 249         rc = pcie_init_notification(ctrl);
 250         if (rc) {
 251                 ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
 252                 goto err_out_free_ctrl_slot;
 253         }
 254
 255         /* Check if slot is occupied */
 256         slot = ctrl->slot;
 257         pciehp_get_adapter_status(slot, &occupied);
 258         pciehp_get_power_status(slot, &poweron);
 259         if (occupied && pciehp_force) {
 260                 mutex_lock(&slot->hotplug_lock);
 261                 pciehp_enable_slot(slot);
 262                 mutex_unlock(&slot->hotplug_lock);
 263         }
 264         /* If empty slot's power status is on, turn power off */
 265         if (!occupied && poweron && POWER_CTRL(ctrl))
 266                 pciehp_power_off_slot(slot);
 267
 268         return 0;
 269
 270 err_out_free_ctrl_slot:
 271         cleanup_slot(ctrl);
 272 err_out_release_ctlr:
 273         pciehp_release_ctrl(ctrl);
 274         return -ENODEV;
 275 }
 276
 277 static void pciehp_remove(struct pcie_device *dev)
 278 {
 279         struct controller *ctrl = get_service_data(dev);
 280
 281         cleanup_slot(ctrl);
 282         pciehp_release_ctrl(ctrl);
 283 }
 284
 285 #ifdef CONFIG_PM
 286 static int pciehp_suspend(struct pcie_device *dev)
 287 {
 288         return 0;
 289 }
 290
 291 static int pciehp_resume(struct pcie_device *dev)
 292 {
 293         struct controller *ctrl;
 294         struct slot *slot;
 295         u8 status;
 296
 297         ctrl = get_service_data(dev);
 298
 299         /* reinitialize the chipset's event detection logic */
 300         pcie_enable_notification(ctrl);
 301
 302         slot = ctrl->slot;
 303
 304         /* Check if slot is occupied */
 305         pciehp_get_adapter_status(slot, &status);
 306         mutex_lock(&slot->hotplug_lock);
 307         if (status)
 308                 pciehp_enable_slot(slot);
 309         else
 310                 pciehp_disable_slot(slot);
 311         mutex_unlock(&slot->hotplug_lock);
 312         return 0;
 313 }
 314 #endif /* PM */
 315
 316 static struct pcie_port_service_driver hpdriver_portdrv = {
 317         .name           = PCIE_MODULE_NAME,
 318         .port_type      = PCIE_ANY_PORT,
 319         .service        = PCIE_PORT_SERVICE_HP,
 320
 321         .probe          = pciehp_probe,
 322         .remove         = pciehp_remove,
 323
 324 #ifdef  CONFIG_PM
 325         .suspend        = pciehp_suspend,
 326         .resume         = pciehp_resume,
 327 #endif  /* PM */
 328 };
 329
 330 static int __init pcied_init(void)
 331 {
 332         int retval = 0;
 333
 334         retval = pcie_port_service_register(&hpdriver_portdrv);
 335         dbg("pcie_port_service_register = %d\n", retval);
 336         if (retval)
 337                 dbg("Failure to register service\n");
 338
 339         return retval;
 340 }
 341 device_initcall(pcied_init);