2 * PCI Express Hot Plug Controller Driver
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
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.
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
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.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/kernel.h>
33 #include <linux/types.h>
34 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/time.h>
39 /* Global variables */
44 static int pciehp_slot_with_bus;
45 struct workqueue_struct *pciehp_wq;
47 #define DRIVER_VERSION "0.4"
48 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
49 #define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
51 MODULE_AUTHOR(DRIVER_AUTHOR);
52 MODULE_DESCRIPTION(DRIVER_DESC);
53 MODULE_LICENSE("GPL");
55 module_param(pciehp_debug, bool, 0644);
56 module_param(pciehp_poll_mode, bool, 0644);
57 module_param(pciehp_poll_time, int, 0644);
58 module_param(pciehp_force, bool, 0644);
59 module_param(pciehp_slot_with_bus, bool, 0644);
60 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
61 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
62 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
63 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
64 MODULE_PARM_DESC(pciehp_slot_with_bus, "Use bus number in the slot name");
66 #define PCIE_MODULE_NAME "pciehp"
68 static int set_attention_status (struct hotplug_slot *slot, u8 value);
69 static int enable_slot (struct hotplug_slot *slot);
70 static int disable_slot (struct hotplug_slot *slot);
71 static int get_power_status (struct hotplug_slot *slot, u8 *value);
72 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
73 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
74 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
75 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
76 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
78 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
80 .set_attention_status = set_attention_status,
81 .enable_slot = enable_slot,
82 .disable_slot = disable_slot,
83 .get_power_status = get_power_status,
84 .get_attention_status = get_attention_status,
85 .get_latch_status = get_latch_status,
86 .get_adapter_status = get_adapter_status,
87 .get_max_bus_speed = get_max_bus_speed,
88 .get_cur_bus_speed = get_cur_bus_speed,
92 * Check the status of the Electro Mechanical Interlock (EMI)
94 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
96 struct slot *slot = hotplug_slot->private;
97 return (slot->hpc_ops->get_emi_status(slot, value));
101 * sysfs interface for the Electro Mechanical Interlock (EMI)
102 * 1 == locked, 0 == unlocked
104 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
109 retval = get_lock_status(slot, &value);
112 retval = sprintf (buf, "%d\n", value);
119 * Change the status of the Electro Mechanical Interlock (EMI)
120 * This is a toggle - in addition there must be at least 1 second
121 * in between toggles.
123 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
125 struct slot *slot = hotplug_slot->private;
129 mutex_lock(&slot->ctrl->crit_sect);
131 /* has it been >1 sec since our last toggle? */
132 if ((get_seconds() - slot->last_emi_toggle) < 1)
135 /* see what our current state is */
136 retval = get_lock_status(hotplug_slot, &value);
137 if (retval || (value == status))
140 slot->hpc_ops->toggle_emi(slot);
142 mutex_unlock(&slot->ctrl->crit_sect);
147 * sysfs interface which allows the user to toggle the Electro Mechanical
148 * Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
150 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
157 llock = simple_strtoul(buf, NULL, 10);
158 lock = (u8)(llock & 0xff);
163 retval = set_lock_status(slot, lock);
166 err ("%d is an invalid lock value\n", lock);
174 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
175 .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
176 .show = lock_read_file,
177 .store = lock_write_file
181 * release_slot - free up the memory used by a slot
182 * @hotplug_slot: slot to free
184 static void release_slot(struct hotplug_slot *hotplug_slot)
186 struct slot *slot = hotplug_slot->private;
188 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
190 kfree(slot->hotplug_slot->info);
191 kfree(slot->hotplug_slot);
195 static void make_slot_name(struct slot *slot)
197 if (pciehp_slot_with_bus)
198 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
199 slot->bus, slot->number);
201 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d",
205 static int init_slots(struct controller *ctrl)
208 struct hotplug_slot *hotplug_slot;
209 struct hotplug_slot_info *info;
210 int retval = -ENOMEM;
213 for (i = 0; i < ctrl->num_slots; i++) {
214 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
218 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
221 slot->hotplug_slot = hotplug_slot;
223 info = kzalloc(sizeof(*info), GFP_KERNEL);
226 hotplug_slot->info = info;
228 hotplug_slot->name = slot->name;
232 slot->bus = ctrl->pci_dev->subordinate->number;
233 slot->device = ctrl->slot_device_offset + i;
234 slot->hpc_ops = ctrl->hpc_ops;
235 slot->number = ctrl->first_slot;
236 mutex_init(&slot->lock);
237 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
239 /* register this slot with the hotplug pci core */
240 hotplug_slot->private = slot;
241 hotplug_slot->release = &release_slot;
242 make_slot_name(slot);
243 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
245 get_power_status(hotplug_slot, &info->power_status);
246 get_attention_status(hotplug_slot, &info->attention_status);
247 get_latch_status(hotplug_slot, &info->latch_status);
248 get_adapter_status(hotplug_slot, &info->adapter_status);
250 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
251 "slot_device_offset=%x\n", slot->bus, slot->device,
252 slot->hp_slot, slot->number, ctrl->slot_device_offset);
253 retval = pci_hp_register(hotplug_slot,
254 ctrl->pci_dev->subordinate,
257 err("pci_hp_register failed with error %d\n", retval);
258 if (retval == -EEXIST)
259 err("Failed to register slot because of name "
260 "collision. Try \'pciehp_slot_with_bus\' "
264 /* create additional sysfs entries */
266 retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
267 &hotplug_slot_attr_lock.attr);
269 pci_hp_deregister(hotplug_slot);
270 err("cannot create additional sysfs entries\n");
275 list_add(&slot->slot_list, &ctrl->slot_list);
289 static void cleanup_slots(struct controller *ctrl)
291 struct list_head *tmp;
292 struct list_head *next;
295 list_for_each_safe(tmp, next, &ctrl->slot_list) {
296 slot = list_entry(tmp, struct slot, slot_list);
297 list_del(&slot->slot_list);
299 sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
300 &hotplug_slot_attr_lock.attr);
301 cancel_delayed_work(&slot->work);
302 flush_scheduled_work();
303 flush_workqueue(pciehp_wq);
304 pci_hp_deregister(slot->hotplug_slot);
309 * set_attention_status - Turns the Amber LED for a slot on, off or blink
311 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
313 struct slot *slot = hotplug_slot->private;
315 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
317 hotplug_slot->info->attention_status = status;
319 if (ATTN_LED(slot->ctrl))
320 slot->hpc_ops->set_attention_status(slot, status);
326 static int enable_slot(struct hotplug_slot *hotplug_slot)
328 struct slot *slot = hotplug_slot->private;
330 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
332 return pciehp_sysfs_enable_slot(slot);
336 static int disable_slot(struct hotplug_slot *hotplug_slot)
338 struct slot *slot = hotplug_slot->private;
340 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
342 return pciehp_sysfs_disable_slot(slot);
345 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
347 struct slot *slot = hotplug_slot->private;
350 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
352 retval = slot->hpc_ops->get_power_status(slot, value);
354 *value = hotplug_slot->info->power_status;
359 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
361 struct slot *slot = hotplug_slot->private;
364 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
366 retval = slot->hpc_ops->get_attention_status(slot, value);
368 *value = hotplug_slot->info->attention_status;
373 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
375 struct slot *slot = hotplug_slot->private;
378 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
380 retval = slot->hpc_ops->get_latch_status(slot, value);
382 *value = hotplug_slot->info->latch_status;
387 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
389 struct slot *slot = hotplug_slot->private;
392 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
394 retval = slot->hpc_ops->get_adapter_status(slot, value);
396 *value = hotplug_slot->info->adapter_status;
401 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
402 enum pci_bus_speed *value)
404 struct slot *slot = hotplug_slot->private;
407 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
409 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
411 *value = PCI_SPEED_UNKNOWN;
416 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
418 struct slot *slot = hotplug_slot->private;
421 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
423 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
425 *value = PCI_SPEED_UNKNOWN;
430 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
433 struct controller *ctrl;
436 struct pci_dev *pdev = dev->port;
439 dbg("Bypassing BIOS check for pciehp use on %s\n",
441 else if (pciehp_get_hp_hw_control_from_firmware(pdev))
444 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
446 err("%s : out of memory\n", __func__);
449 INIT_LIST_HEAD(&ctrl->slot_list);
451 rc = pcie_init(ctrl, dev);
453 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
454 goto err_out_free_ctrl;
457 pci_set_drvdata(pdev, ctrl);
459 dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
460 __func__, pdev->bus->number, PCI_SLOT(pdev->devfn),
461 PCI_FUNC(pdev->devfn), pdev->irq);
463 /* Setup the slot information structures */
464 rc = init_slots(ctrl);
467 warn("%s: slot already registered by another "
468 "hotplug driver\n", PCIE_MODULE_NAME);
470 err("%s: slot initialization failed\n",
472 goto err_out_release_ctlr;
475 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
477 t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
478 if (value && pciehp_force) {
479 rc = pciehp_enable_slot(t_slot);
480 if (rc) /* -ENODEV: shouldn't happen, but deal with it */
483 if ((POWER_CTRL(ctrl)) && !value) {
484 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
486 goto err_out_free_ctrl_slot;
491 err_out_free_ctrl_slot:
493 err_out_release_ctlr:
494 ctrl->hpc_ops->release_ctlr(ctrl);
501 static void pciehp_remove (struct pcie_device *dev)
503 struct pci_dev *pdev = dev->port;
504 struct controller *ctrl = pci_get_drvdata(pdev);
507 ctrl->hpc_ops->release_ctlr(ctrl);
512 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
514 printk("%s ENTRY\n", __func__);
518 static int pciehp_resume (struct pcie_device *dev)
520 printk("%s ENTRY\n", __func__);
522 struct pci_dev *pdev = dev->port;
523 struct controller *ctrl = pci_get_drvdata(pdev);
527 /* reinitialize the chipset's event detection logic */
528 pcie_init_hardware_part2(ctrl, dev);
530 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
532 /* Check if slot is occupied */
533 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
535 pciehp_enable_slot(t_slot);
537 pciehp_disable_slot(t_slot);
543 static struct pcie_port_service_id port_pci_ids[] = { {
544 .vendor = PCI_ANY_ID,
545 .device = PCI_ANY_ID,
546 .port_type = PCIE_ANY_PORT,
547 .service_type = PCIE_PORT_SERVICE_HP,
549 }, { /* end: all zeroes */ }
551 static const char device_name[] = "hpdriver";
553 static struct pcie_port_service_driver hpdriver_portdrv = {
554 .name = (char *)device_name,
555 .id_table = &port_pci_ids[0],
557 .probe = pciehp_probe,
558 .remove = pciehp_remove,
561 .suspend = pciehp_suspend,
562 .resume = pciehp_resume,
566 static int __init pcied_init(void)
570 retval = pcie_port_service_register(&hpdriver_portdrv);
571 dbg("pcie_port_service_register = %d\n", retval);
572 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
574 dbg("%s: Failure to register service\n", __func__);
578 static void __exit pcied_cleanup(void)
580 dbg("unload_pciehpd()\n");
581 pcie_port_service_unregister(&hpdriver_portdrv);
582 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
585 module_init(pcied_init);
586 module_exit(pcied_cleanup);