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_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
73 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
75 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
77 .set_attention_status = set_attention_status,
78 .enable_slot = enable_slot,
79 .disable_slot = disable_slot,
80 .get_power_status = get_power_status,
81 .get_attention_status = get_attention_status,
82 .get_latch_status = get_latch_status,
83 .get_adapter_status = get_adapter_status,
84 .get_max_bus_speed = get_max_bus_speed,
85 .get_cur_bus_speed = get_cur_bus_speed,
89 * Check the status of the Electro Mechanical Interlock (EMI)
91 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
93 struct slot *slot = hotplug_slot->private;
94 return (slot->hpc_ops->get_emi_status(slot, value));
98 * sysfs interface for the Electro Mechanical Interlock (EMI)
99 * 1 == locked, 0 == unlocked
101 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
106 retval = get_lock_status(slot, &value);
109 retval = sprintf (buf, "%d\n", value);
116 * Change the status of the Electro Mechanical Interlock (EMI)
117 * This is a toggle - in addition there must be at least 1 second
118 * in between toggles.
120 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
122 struct slot *slot = hotplug_slot->private;
126 mutex_lock(&slot->ctrl->crit_sect);
128 /* has it been >1 sec since our last toggle? */
129 if ((get_seconds() - slot->last_emi_toggle) < 1) {
130 mutex_unlock(&slot->ctrl->crit_sect);
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 *hotplug_slot,
150 const char *buf, size_t count)
152 struct slot *slot = hotplug_slot->private;
157 llock = simple_strtoul(buf, NULL, 10);
158 lock = (u8)(llock & 0xff);
163 retval = set_lock_status(hotplug_slot, lock);
166 ctrl_err(slot->ctrl, "%d is an invalid lock value\n",
175 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
176 .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
177 .show = lock_read_file,
178 .store = lock_write_file
182 * release_slot - free up the memory used by a slot
183 * @hotplug_slot: slot to free
185 static void release_slot(struct hotplug_slot *hotplug_slot)
187 struct slot *slot = hotplug_slot->private;
189 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
190 __func__, hotplug_slot_name(hotplug_slot));
192 kfree(hotplug_slot->info);
196 static int init_slots(struct controller *ctrl)
199 struct hotplug_slot *hotplug_slot;
200 struct hotplug_slot_info *info;
201 char name[SLOT_NAME_SIZE];
202 int retval = -ENOMEM;
204 list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
205 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
209 info = kzalloc(sizeof(*info), GFP_KERNEL);
213 /* register this slot with the hotplug pci core */
214 hotplug_slot->info = info;
215 hotplug_slot->private = slot;
216 hotplug_slot->release = &release_slot;
217 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
218 slot->hotplug_slot = hotplug_slot;
219 snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
221 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
222 "hp_slot=%x sun=%x slot_device_offset=%x\n",
223 pci_domain_nr(ctrl->pci_dev->subordinate),
224 slot->bus, slot->device, slot->hp_slot, slot->number,
225 ctrl->slot_device_offset);
226 retval = pci_hp_register(hotplug_slot,
227 ctrl->pci_dev->subordinate,
231 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
235 get_power_status(hotplug_slot, &info->power_status);
236 get_attention_status(hotplug_slot, &info->attention_status);
237 get_latch_status(hotplug_slot, &info->latch_status);
238 get_adapter_status(hotplug_slot, &info->adapter_status);
239 /* create additional sysfs entries */
241 retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
242 &hotplug_slot_attr_lock.attr);
244 pci_hp_deregister(hotplug_slot);
245 ctrl_err(ctrl, "Cannot create additional sysfs "
261 static void cleanup_slots(struct controller *ctrl)
265 list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
267 sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
268 &hotplug_slot_attr_lock.attr);
269 pci_hp_deregister(slot->hotplug_slot);
274 * set_attention_status - Turns the Amber LED for a slot on, off or blink
276 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
278 struct slot *slot = hotplug_slot->private;
280 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
281 __func__, slot_name(slot));
283 hotplug_slot->info->attention_status = status;
285 if (ATTN_LED(slot->ctrl))
286 slot->hpc_ops->set_attention_status(slot, status);
292 static int enable_slot(struct hotplug_slot *hotplug_slot)
294 struct slot *slot = hotplug_slot->private;
296 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
297 __func__, slot_name(slot));
299 return pciehp_sysfs_enable_slot(slot);
303 static int disable_slot(struct hotplug_slot *hotplug_slot)
305 struct slot *slot = hotplug_slot->private;
307 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
308 __func__, slot_name(slot));
310 return pciehp_sysfs_disable_slot(slot);
313 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
315 struct slot *slot = hotplug_slot->private;
318 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
319 __func__, slot_name(slot));
321 retval = slot->hpc_ops->get_power_status(slot, value);
323 *value = hotplug_slot->info->power_status;
328 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
330 struct slot *slot = hotplug_slot->private;
333 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
334 __func__, slot_name(slot));
336 retval = slot->hpc_ops->get_attention_status(slot, value);
338 *value = hotplug_slot->info->attention_status;
343 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
345 struct slot *slot = hotplug_slot->private;
348 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
349 __func__, slot_name(slot));
351 retval = slot->hpc_ops->get_latch_status(slot, value);
353 *value = hotplug_slot->info->latch_status;
358 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
360 struct slot *slot = hotplug_slot->private;
363 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
364 __func__, slot_name(slot));
366 retval = slot->hpc_ops->get_adapter_status(slot, value);
368 *value = hotplug_slot->info->adapter_status;
373 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
374 enum pci_bus_speed *value)
376 struct slot *slot = hotplug_slot->private;
379 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
380 __func__, slot_name(slot));
382 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
384 *value = PCI_SPEED_UNKNOWN;
389 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
391 struct slot *slot = hotplug_slot->private;
394 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
395 __func__, slot_name(slot));
397 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
399 *value = PCI_SPEED_UNKNOWN;
404 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
407 struct controller *ctrl;
410 struct pci_dev *pdev = dev->port;
413 dev_info(&dev->device,
414 "Bypassing BIOS check for pciehp use on %s\n",
416 else if (pciehp_get_hp_hw_control_from_firmware(pdev))
419 ctrl = pcie_init(dev);
421 dev_err(&dev->device, "Controller initialization failed\n");
424 set_service_data(dev, ctrl);
426 /* Setup the slot information structures */
427 rc = init_slots(ctrl);
430 ctrl_warn(ctrl, "Slot already registered by another "
433 ctrl_err(ctrl, "Slot initialization failed\n");
434 goto err_out_release_ctlr;
437 /* Check if slot is occupied */
438 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
439 t_slot->hpc_ops->get_adapter_status(t_slot, &value);
442 pciehp_enable_slot(t_slot);
444 /* Power off slot if not occupied */
445 if (POWER_CTRL(ctrl)) {
446 rc = t_slot->hpc_ops->power_off_slot(t_slot);
448 goto err_out_free_ctrl_slot;
454 err_out_free_ctrl_slot:
456 err_out_release_ctlr:
457 ctrl->hpc_ops->release_ctlr(ctrl);
462 static void pciehp_remove (struct pcie_device *dev)
464 struct controller *ctrl = get_service_data(dev);
467 ctrl->hpc_ops->release_ctlr(ctrl);
471 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
473 dev_info(&dev->device, "%s ENTRY\n", __func__);
477 static int pciehp_resume (struct pcie_device *dev)
479 dev_info(&dev->device, "%s ENTRY\n", __func__);
481 struct controller *ctrl = get_service_data(dev);
485 /* reinitialize the chipset's event detection logic */
486 pcie_enable_notification(ctrl);
488 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
490 /* Check if slot is occupied */
491 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
493 pciehp_enable_slot(t_slot);
495 pciehp_disable_slot(t_slot);
501 static struct pcie_port_service_id port_pci_ids[] = { {
502 .vendor = PCI_ANY_ID,
503 .device = PCI_ANY_ID,
504 .port_type = PCIE_ANY_PORT,
505 .service_type = PCIE_PORT_SERVICE_HP,
507 }, { /* end: all zeroes */ }
510 static struct pcie_port_service_driver hpdriver_portdrv = {
511 .name = PCIE_MODULE_NAME,
512 .id_table = &port_pci_ids[0],
514 .probe = pciehp_probe,
515 .remove = pciehp_remove,
518 .suspend = pciehp_suspend,
519 .resume = pciehp_resume,
523 static int __init pcied_init(void)
527 pciehp_firmware_init();
528 retval = pcie_port_service_register(&hpdriver_portdrv);
529 dbg("pcie_port_service_register = %d\n", retval);
530 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
532 dbg("Failure to register service\n");
536 static void __exit pcied_cleanup(void)
538 dbg("unload_pciehpd()\n");
539 pcie_port_service_unregister(&hpdriver_portdrv);
540 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
543 module_init(pcied_init);
544 module_exit(pcied_cleanup);