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 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_address (struct hotplug_slot *slot, u32 *value);
76 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
77 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
79 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
81 .set_attention_status = set_attention_status,
82 .enable_slot = enable_slot,
83 .disable_slot = disable_slot,
84 .get_power_status = get_power_status,
85 .get_attention_status = get_attention_status,
86 .get_latch_status = get_latch_status,
87 .get_adapter_status = get_adapter_status,
88 .get_address = get_address,
89 .get_max_bus_speed = get_max_bus_speed,
90 .get_cur_bus_speed = get_cur_bus_speed,
94 * Check the status of the Electro Mechanical Interlock (EMI)
96 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
98 struct slot *slot = hotplug_slot->private;
99 return (slot->hpc_ops->get_emi_status(slot, value));
103 * sysfs interface for the Electro Mechanical Interlock (EMI)
104 * 1 == locked, 0 == unlocked
106 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
111 retval = get_lock_status(slot, &value);
114 retval = sprintf (buf, "%d\n", value);
121 * Change the status of the Electro Mechanical Interlock (EMI)
122 * This is a toggle - in addition there must be at least 1 second
123 * in between toggles.
125 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
127 struct slot *slot = hotplug_slot->private;
131 mutex_lock(&slot->ctrl->crit_sect);
133 /* has it been >1 sec since our last toggle? */
134 if ((get_seconds() - slot->last_emi_toggle) < 1)
137 /* see what our current state is */
138 retval = get_lock_status(hotplug_slot, &value);
139 if (retval || (value == status))
142 slot->hpc_ops->toggle_emi(slot);
144 mutex_unlock(&slot->ctrl->crit_sect);
149 * sysfs interface which allows the user to toggle the Electro Mechanical
150 * Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
152 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
159 llock = simple_strtoul(buf, NULL, 10);
160 lock = (u8)(llock & 0xff);
165 retval = set_lock_status(slot, lock);
168 err ("%d is an invalid lock value\n", lock);
176 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
177 .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
178 .show = lock_read_file,
179 .store = lock_write_file
183 * release_slot - free up the memory used by a slot
184 * @hotplug_slot: slot to free
186 static void release_slot(struct hotplug_slot *hotplug_slot)
188 struct slot *slot = hotplug_slot->private;
190 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
192 kfree(slot->hotplug_slot->info);
193 kfree(slot->hotplug_slot);
197 static void make_slot_name(struct slot *slot)
199 if (pciehp_slot_with_bus)
200 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
201 slot->bus, slot->number);
203 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d",
207 static int init_slots(struct controller *ctrl)
210 struct hotplug_slot *hotplug_slot;
211 struct hotplug_slot_info *info;
212 int retval = -ENOMEM;
215 for (i = 0; i < ctrl->num_slots; i++) {
216 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
220 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
223 slot->hotplug_slot = hotplug_slot;
225 info = kzalloc(sizeof(*info), GFP_KERNEL);
228 hotplug_slot->info = info;
230 hotplug_slot->name = slot->name;
234 slot->bus = ctrl->pci_dev->subordinate->number;
235 slot->device = ctrl->slot_device_offset + i;
236 slot->hpc_ops = ctrl->hpc_ops;
237 slot->number = ctrl->first_slot;
238 mutex_init(&slot->lock);
239 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
241 /* register this slot with the hotplug pci core */
242 hotplug_slot->private = slot;
243 hotplug_slot->release = &release_slot;
244 make_slot_name(slot);
245 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
247 get_power_status(hotplug_slot, &info->power_status);
248 get_attention_status(hotplug_slot, &info->attention_status);
249 get_latch_status(hotplug_slot, &info->latch_status);
250 get_adapter_status(hotplug_slot, &info->adapter_status);
252 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
253 "slot_device_offset=%x\n", slot->bus, slot->device,
254 slot->hp_slot, slot->number, ctrl->slot_device_offset);
255 retval = pci_hp_register(hotplug_slot);
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->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->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_address(struct hotplug_slot *hotplug_slot, u32 *value)
403 struct slot *slot = hotplug_slot->private;
404 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
406 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
408 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
413 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
415 struct slot *slot = hotplug_slot->private;
418 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
420 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
422 *value = PCI_SPEED_UNKNOWN;
427 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
429 struct slot *slot = hotplug_slot->private;
432 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
434 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
436 *value = PCI_SPEED_UNKNOWN;
441 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
444 struct controller *ctrl;
447 struct pci_dev *pdev;
449 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
451 err("%s : out of memory\n", __func__);
454 INIT_LIST_HEAD(&ctrl->slot_list);
457 ctrl->pci_dev = pdev;
459 rc = pcie_init(ctrl, dev);
461 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
462 goto err_out_free_ctrl;
465 pci_set_drvdata(pdev, ctrl);
467 dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
468 __func__, pdev->bus->number, PCI_SLOT(pdev->devfn),
469 PCI_FUNC(pdev->devfn), pdev->irq);
471 /* Setup the slot information structures */
472 rc = init_slots(ctrl);
474 err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
475 goto err_out_release_ctlr;
478 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
480 t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
481 if (value && pciehp_force) {
482 rc = pciehp_enable_slot(t_slot);
483 if (rc) /* -ENODEV: shouldn't happen, but deal with it */
486 if ((POWER_CTRL(ctrl)) && !value) {
487 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
489 goto err_out_free_ctrl_slot;
494 err_out_free_ctrl_slot:
496 err_out_release_ctlr:
497 ctrl->hpc_ops->release_ctlr(ctrl);
504 static void pciehp_remove (struct pcie_device *dev)
506 struct pci_dev *pdev = dev->port;
507 struct controller *ctrl = pci_get_drvdata(pdev);
510 ctrl->hpc_ops->release_ctlr(ctrl);
515 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
517 printk("%s ENTRY\n", __func__);
521 static int pciehp_resume (struct pcie_device *dev)
523 printk("%s ENTRY\n", __func__);
525 struct pci_dev *pdev = dev->port;
526 struct controller *ctrl = pci_get_drvdata(pdev);
530 /* reinitialize the chipset's event detection logic */
531 pcie_init_hardware_part2(ctrl, dev);
533 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
535 /* Check if slot is occupied */
536 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
538 pciehp_enable_slot(t_slot);
540 pciehp_disable_slot(t_slot);
546 static struct pcie_port_service_id port_pci_ids[] = { {
547 .vendor = PCI_ANY_ID,
548 .device = PCI_ANY_ID,
549 .port_type = PCIE_ANY_PORT,
550 .service_type = PCIE_PORT_SERVICE_HP,
552 }, { /* end: all zeroes */ }
554 static const char device_name[] = "hpdriver";
556 static struct pcie_port_service_driver hpdriver_portdrv = {
557 .name = (char *)device_name,
558 .id_table = &port_pci_ids[0],
560 .probe = pciehp_probe,
561 .remove = pciehp_remove,
564 .suspend = pciehp_suspend,
565 .resume = pciehp_resume,
569 static int __init pcied_init(void)
573 retval = pcie_port_service_register(&hpdriver_portdrv);
574 dbg("pcie_port_service_register = %d\n", retval);
575 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
577 dbg("%s: Failure to register service\n", __func__);
581 static void __exit pcied_cleanup(void)
583 dbg("unload_pciehpd()\n");
584 pcie_port_service_unregister(&hpdriver_portdrv);
585 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
588 module_init(pcied_init);
589 module_exit(pcied_cleanup);