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_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 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
188 kfree(hotplug_slot->info);
192 static int init_slots(struct controller *ctrl)
195 struct hotplug_slot *hotplug_slot;
196 struct hotplug_slot_info *info;
197 int retval = -ENOMEM;
199 list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
200 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
204 info = kzalloc(sizeof(*info), GFP_KERNEL);
208 /* register this slot with the hotplug pci core */
209 hotplug_slot->info = info;
210 hotplug_slot->name = slot->name;
211 hotplug_slot->private = slot;
212 hotplug_slot->release = &release_slot;
213 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
214 get_power_status(hotplug_slot, &info->power_status);
215 get_attention_status(hotplug_slot, &info->attention_status);
216 get_latch_status(hotplug_slot, &info->latch_status);
217 get_adapter_status(hotplug_slot, &info->adapter_status);
218 slot->hotplug_slot = hotplug_slot;
220 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
221 "slot_device_offset=%x\n", slot->bus, slot->device,
222 slot->hp_slot, slot->number, ctrl->slot_device_offset);
223 retval = pci_hp_register(hotplug_slot,
224 ctrl->pci_dev->subordinate,
227 err("pci_hp_register failed with error %d\n", retval);
228 if (retval == -EEXIST)
229 err("Failed to register slot because of name "
230 "collision. Try \'pciehp_slot_with_bus\' "
234 /* create additional sysfs entries */
236 retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
237 &hotplug_slot_attr_lock.attr);
239 pci_hp_deregister(hotplug_slot);
240 err("cannot create additional sysfs entries\n");
255 static void cleanup_slots(struct controller *ctrl)
259 list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
261 sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
262 &hotplug_slot_attr_lock.attr);
263 pci_hp_deregister(slot->hotplug_slot);
268 * set_attention_status - Turns the Amber LED for a slot on, off or blink
270 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
272 struct slot *slot = hotplug_slot->private;
274 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
276 hotplug_slot->info->attention_status = status;
278 if (ATTN_LED(slot->ctrl))
279 slot->hpc_ops->set_attention_status(slot, status);
285 static int enable_slot(struct hotplug_slot *hotplug_slot)
287 struct slot *slot = hotplug_slot->private;
289 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
291 return pciehp_sysfs_enable_slot(slot);
295 static int disable_slot(struct hotplug_slot *hotplug_slot)
297 struct slot *slot = hotplug_slot->private;
299 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
301 return pciehp_sysfs_disable_slot(slot);
304 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
306 struct slot *slot = hotplug_slot->private;
309 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
311 retval = slot->hpc_ops->get_power_status(slot, value);
313 *value = hotplug_slot->info->power_status;
318 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
320 struct slot *slot = hotplug_slot->private;
323 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
325 retval = slot->hpc_ops->get_attention_status(slot, value);
327 *value = hotplug_slot->info->attention_status;
332 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
334 struct slot *slot = hotplug_slot->private;
337 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
339 retval = slot->hpc_ops->get_latch_status(slot, value);
341 *value = hotplug_slot->info->latch_status;
346 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
348 struct slot *slot = hotplug_slot->private;
351 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
353 retval = slot->hpc_ops->get_adapter_status(slot, value);
355 *value = hotplug_slot->info->adapter_status;
360 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
361 enum pci_bus_speed *value)
363 struct slot *slot = hotplug_slot->private;
366 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
368 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
370 *value = PCI_SPEED_UNKNOWN;
375 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
377 struct slot *slot = hotplug_slot->private;
380 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
382 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
384 *value = PCI_SPEED_UNKNOWN;
389 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
392 struct controller *ctrl;
395 struct pci_dev *pdev = dev->port;
398 dbg("Bypassing BIOS check for pciehp use on %s\n",
400 else if (pciehp_get_hp_hw_control_from_firmware(pdev))
403 ctrl = pcie_init(dev);
405 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
408 set_service_data(dev, ctrl);
410 /* Setup the slot information structures */
411 rc = init_slots(ctrl);
414 warn("%s: slot already registered by another "
415 "hotplug driver\n", PCIE_MODULE_NAME);
417 err("%s: slot initialization failed\n",
419 goto err_out_release_ctlr;
422 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
424 t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
425 if (value && pciehp_force) {
426 rc = pciehp_enable_slot(t_slot);
427 if (rc) /* -ENODEV: shouldn't happen, but deal with it */
430 if ((POWER_CTRL(ctrl)) && !value) {
431 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
433 goto err_out_free_ctrl_slot;
438 err_out_free_ctrl_slot:
440 err_out_release_ctlr:
441 ctrl->hpc_ops->release_ctlr(ctrl);
446 static void pciehp_remove (struct pcie_device *dev)
448 struct controller *ctrl = get_service_data(dev);
451 ctrl->hpc_ops->release_ctlr(ctrl);
455 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
457 printk("%s ENTRY\n", __func__);
461 static int pciehp_resume (struct pcie_device *dev)
463 printk("%s ENTRY\n", __func__);
465 struct controller *ctrl = get_service_data(dev);
469 /* reinitialize the chipset's event detection logic */
470 pcie_enable_notification(ctrl);
472 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
474 /* Check if slot is occupied */
475 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
477 pciehp_enable_slot(t_slot);
479 pciehp_disable_slot(t_slot);
485 static struct pcie_port_service_id port_pci_ids[] = { {
486 .vendor = PCI_ANY_ID,
487 .device = PCI_ANY_ID,
488 .port_type = PCIE_ANY_PORT,
489 .service_type = PCIE_PORT_SERVICE_HP,
491 }, { /* end: all zeroes */ }
493 static const char device_name[] = "hpdriver";
495 static struct pcie_port_service_driver hpdriver_portdrv = {
496 .name = (char *)device_name,
497 .id_table = &port_pci_ids[0],
499 .probe = pciehp_probe,
500 .remove = pciehp_remove,
503 .suspend = pciehp_suspend,
504 .resume = pciehp_resume,
508 static int __init pcied_init(void)
512 retval = pcie_port_service_register(&hpdriver_portdrv);
513 dbg("pcie_port_service_register = %d\n", retval);
514 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
516 dbg("%s: Failure to register service\n", __func__);
520 static void __exit pcied_cleanup(void)
522 dbg("unload_pciehpd()\n");
523 pcie_port_service_unregister(&hpdriver_portdrv);
524 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
527 module_init(pcied_init);
528 module_exit(pcied_cleanup);