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 struct workqueue_struct *pciehp_wq;
46 #define DRIVER_VERSION "0.4"
47 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
48 #define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
50 MODULE_AUTHOR(DRIVER_AUTHOR);
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
54 module_param(pciehp_debug, bool, 0644);
55 module_param(pciehp_poll_mode, bool, 0644);
56 module_param(pciehp_poll_time, int, 0644);
57 module_param(pciehp_force, bool, 0644);
58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
63 #define PCIE_MODULE_NAME "pciehp"
65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
66 static int enable_slot (struct hotplug_slot *slot);
67 static int disable_slot (struct hotplug_slot *slot);
68 static int get_power_status (struct hotplug_slot *slot, u8 *value);
69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
70 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
71 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
72 static int get_address (struct hotplug_slot *slot, u32 *value);
73 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
74 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
76 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
78 .set_attention_status = set_attention_status,
79 .enable_slot = enable_slot,
80 .disable_slot = disable_slot,
81 .get_power_status = get_power_status,
82 .get_attention_status = get_attention_status,
83 .get_latch_status = get_latch_status,
84 .get_adapter_status = get_adapter_status,
85 .get_address = get_address,
86 .get_max_bus_speed = get_max_bus_speed,
87 .get_cur_bus_speed = get_cur_bus_speed,
91 * Check the status of the Electro Mechanical Interlock (EMI)
93 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
95 struct slot *slot = hotplug_slot->private;
96 return (slot->hpc_ops->get_emi_status(slot, value));
100 * sysfs interface for the Electro Mechanical Interlock (EMI)
101 * 1 == locked, 0 == unlocked
103 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
108 retval = get_lock_status(slot, &value);
111 retval = sprintf (buf, "%d\n", value);
118 * Change the status of the Electro Mechanical Interlock (EMI)
119 * This is a toggle - in addition there must be at least 1 second
120 * in between toggles.
122 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
124 struct slot *slot = hotplug_slot->private;
128 mutex_lock(&slot->ctrl->crit_sect);
130 /* has it been >1 sec since our last toggle? */
131 if ((get_seconds() - slot->last_emi_toggle) < 1)
134 /* see what our current state is */
135 retval = get_lock_status(hotplug_slot, &value);
136 if (retval || (value == status))
139 slot->hpc_ops->toggle_emi(slot);
141 mutex_unlock(&slot->ctrl->crit_sect);
146 * sysfs interface which allows the user to toggle the Electro Mechanical
147 * Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
149 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
156 llock = simple_strtoul(buf, NULL, 10);
157 lock = (u8)(llock & 0xff);
162 retval = set_lock_status(slot, lock);
165 err ("%d is an invalid lock value\n", lock);
173 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
174 .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
175 .show = lock_read_file,
176 .store = lock_write_file
180 * release_slot - free up the memory used by a slot
181 * @hotplug_slot: slot to free
183 static void release_slot(struct hotplug_slot *hotplug_slot)
185 struct slot *slot = hotplug_slot->private;
187 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
189 kfree(slot->hotplug_slot->info);
190 kfree(slot->hotplug_slot);
194 static void make_slot_name(struct slot *slot)
196 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
197 slot->bus, slot->number);
200 static int init_slots(struct controller *ctrl)
203 struct hotplug_slot *hotplug_slot;
204 struct hotplug_slot_info *info;
205 int retval = -ENOMEM;
208 for (i = 0; i < ctrl->num_slots; i++) {
209 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
213 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
216 slot->hotplug_slot = hotplug_slot;
218 info = kzalloc(sizeof(*info), GFP_KERNEL);
221 hotplug_slot->info = info;
223 hotplug_slot->name = slot->name;
227 slot->bus = ctrl->pci_dev->subordinate->number;
228 slot->device = ctrl->slot_device_offset + i;
229 slot->hpc_ops = ctrl->hpc_ops;
230 slot->number = ctrl->first_slot;
231 mutex_init(&slot->lock);
232 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
234 /* register this slot with the hotplug pci core */
235 hotplug_slot->private = slot;
236 hotplug_slot->release = &release_slot;
237 make_slot_name(slot);
238 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
240 get_power_status(hotplug_slot, &info->power_status);
241 get_attention_status(hotplug_slot, &info->attention_status);
242 get_latch_status(hotplug_slot, &info->latch_status);
243 get_adapter_status(hotplug_slot, &info->adapter_status);
245 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
246 "slot_device_offset=%x\n", slot->bus, slot->device,
247 slot->hp_slot, slot->number, ctrl->slot_device_offset);
248 retval = pci_hp_register(hotplug_slot);
250 err ("pci_hp_register failed with error %d\n", retval);
253 /* create additional sysfs entries */
254 if (EMI(ctrl->ctrlcap)) {
255 retval = sysfs_create_file(&hotplug_slot->kobj,
256 &hotplug_slot_attr_lock.attr);
258 pci_hp_deregister(hotplug_slot);
259 err("cannot create additional sysfs entries\n");
264 list_add(&slot->slot_list, &ctrl->slot_list);
278 static void cleanup_slots(struct controller *ctrl)
280 struct list_head *tmp;
281 struct list_head *next;
284 list_for_each_safe(tmp, next, &ctrl->slot_list) {
285 slot = list_entry(tmp, struct slot, slot_list);
286 list_del(&slot->slot_list);
287 if (EMI(ctrl->ctrlcap))
288 sysfs_remove_file(&slot->hotplug_slot->kobj,
289 &hotplug_slot_attr_lock.attr);
290 cancel_delayed_work(&slot->work);
291 flush_scheduled_work();
292 flush_workqueue(pciehp_wq);
293 pci_hp_deregister(slot->hotplug_slot);
298 * set_attention_status - Turns the Amber LED for a slot on, off or blink
300 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
302 struct slot *slot = hotplug_slot->private;
304 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
306 hotplug_slot->info->attention_status = status;
308 if (ATTN_LED(slot->ctrl->ctrlcap))
309 slot->hpc_ops->set_attention_status(slot, status);
315 static int enable_slot(struct hotplug_slot *hotplug_slot)
317 struct slot *slot = hotplug_slot->private;
319 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
321 return pciehp_sysfs_enable_slot(slot);
325 static int disable_slot(struct hotplug_slot *hotplug_slot)
327 struct slot *slot = hotplug_slot->private;
329 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
331 return pciehp_sysfs_disable_slot(slot);
334 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
336 struct slot *slot = hotplug_slot->private;
339 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
341 retval = slot->hpc_ops->get_power_status(slot, value);
343 *value = hotplug_slot->info->power_status;
348 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
350 struct slot *slot = hotplug_slot->private;
353 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
355 retval = slot->hpc_ops->get_attention_status(slot, value);
357 *value = hotplug_slot->info->attention_status;
362 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
364 struct slot *slot = hotplug_slot->private;
367 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
369 retval = slot->hpc_ops->get_latch_status(slot, value);
371 *value = hotplug_slot->info->latch_status;
376 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
378 struct slot *slot = hotplug_slot->private;
381 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
383 retval = slot->hpc_ops->get_adapter_status(slot, value);
385 *value = hotplug_slot->info->adapter_status;
390 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
392 struct slot *slot = hotplug_slot->private;
393 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
395 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
397 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
402 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
404 struct slot *slot = hotplug_slot->private;
407 dbg("%s - physical_slot = %s\n", __FUNCTION__, 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", __FUNCTION__, 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;
438 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
440 err("%s : out of memory\n", __FUNCTION__);
443 INIT_LIST_HEAD(&ctrl->slot_list);
446 ctrl->pci_dev = pdev;
448 rc = pcie_init(ctrl, dev);
450 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
451 goto err_out_free_ctrl;
454 pci_set_drvdata(pdev, ctrl);
456 ctrl->bus = pdev->bus->number; /* ctrl bus */
457 ctrl->slot_bus = pdev->subordinate->number; /* bus controlled by this HPC */
459 ctrl->device = PCI_SLOT(pdev->devfn);
460 ctrl->function = PCI_FUNC(pdev->devfn);
461 dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
462 ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
464 /* Setup the slot information structures */
465 rc = init_slots(ctrl);
467 err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
468 goto err_out_release_ctlr;
471 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
473 t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
474 if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
475 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
477 goto err_out_free_ctrl_slot;
482 err_out_free_ctrl_slot:
484 err_out_release_ctlr:
485 ctrl->hpc_ops->release_ctlr(ctrl);
492 static void pciehp_remove (struct pcie_device *dev)
494 struct pci_dev *pdev = dev->port;
495 struct controller *ctrl = pci_get_drvdata(pdev);
498 ctrl->hpc_ops->release_ctlr(ctrl);
503 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
505 printk("%s ENTRY\n", __FUNCTION__);
509 static int pciehp_resume (struct pcie_device *dev)
511 printk("%s ENTRY\n", __FUNCTION__);
516 static struct pcie_port_service_id port_pci_ids[] = { {
517 .vendor = PCI_ANY_ID,
518 .device = PCI_ANY_ID,
519 .port_type = PCIE_ANY_PORT,
520 .service_type = PCIE_PORT_SERVICE_HP,
522 }, { /* end: all zeroes */ }
524 static const char device_name[] = "hpdriver";
526 static struct pcie_port_service_driver hpdriver_portdrv = {
527 .name = (char *)device_name,
528 .id_table = &port_pci_ids[0],
530 .probe = pciehp_probe,
531 .remove = pciehp_remove,
534 .suspend = pciehp_suspend,
535 .resume = pciehp_resume,
539 static int __init pcied_init(void)
543 #ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
544 pciehp_poll_mode = 1;
547 retval = pcie_port_service_register(&hpdriver_portdrv);
548 dbg("pcie_port_service_register = %d\n", retval);
549 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
551 dbg("%s: Failure to register service\n", __FUNCTION__);
555 static void __exit pcied_cleanup(void)
557 dbg("unload_pciehpd()\n");
558 pcie_port_service_unregister(&hpdriver_portdrv);
559 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
562 module_init(pcied_init);
563 module_exit(pcied_cleanup);