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 = {
76 .set_attention_status = set_attention_status,
77 .enable_slot = enable_slot,
78 .disable_slot = disable_slot,
79 .get_power_status = get_power_status,
80 .get_attention_status = get_attention_status,
81 .get_latch_status = get_latch_status,
82 .get_adapter_status = get_adapter_status,
83 .get_max_bus_speed = get_max_bus_speed,
84 .get_cur_bus_speed = get_cur_bus_speed,
88 * release_slot - free up the memory used by a slot
89 * @hotplug_slot: slot to free
91 static void release_slot(struct hotplug_slot *hotplug_slot)
93 struct slot *slot = hotplug_slot->private;
95 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
96 __func__, hotplug_slot_name(hotplug_slot));
98 kfree(hotplug_slot->info);
102 static int init_slot(struct controller *ctrl)
104 struct slot *slot = ctrl->slot;
105 struct hotplug_slot *hotplug = NULL;
106 struct hotplug_slot_info *info = NULL;
107 char name[SLOT_NAME_SIZE];
108 int retval = -ENOMEM;
110 hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
114 info = kzalloc(sizeof(*info), GFP_KERNEL);
118 /* register this slot with the hotplug pci core */
119 hotplug->info = info;
120 hotplug->private = slot;
121 hotplug->release = &release_slot;
122 hotplug->ops = &pciehp_hotplug_slot_ops;
123 slot->hotplug_slot = hotplug;
124 snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
126 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
127 "hp_slot=%x sun=%x slot_device_offset=%x\n",
128 pci_domain_nr(ctrl->pci_dev->subordinate),
129 slot->bus, slot->device, slot->hp_slot, slot->number,
130 ctrl->slot_device_offset);
131 retval = pci_hp_register(hotplug,
132 ctrl->pci_dev->subordinate,
137 "pci_hp_register failed with error %d\n", retval);
140 get_power_status(hotplug, &info->power_status);
141 get_attention_status(hotplug, &info->attention_status);
142 get_latch_status(hotplug, &info->latch_status);
143 get_adapter_status(hotplug, &info->adapter_status);
152 static void cleanup_slot(struct controller *ctrl)
154 pci_hp_deregister(ctrl->slot->hotplug_slot);
158 * set_attention_status - Turns the Amber LED for a slot on, off or blink
160 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
162 struct slot *slot = hotplug_slot->private;
164 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
165 __func__, slot_name(slot));
167 hotplug_slot->info->attention_status = status;
169 if (ATTN_LED(slot->ctrl))
170 slot->hpc_ops->set_attention_status(slot, status);
176 static int enable_slot(struct hotplug_slot *hotplug_slot)
178 struct slot *slot = hotplug_slot->private;
180 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
181 __func__, slot_name(slot));
183 return pciehp_sysfs_enable_slot(slot);
187 static int disable_slot(struct hotplug_slot *hotplug_slot)
189 struct slot *slot = hotplug_slot->private;
191 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
192 __func__, slot_name(slot));
194 return pciehp_sysfs_disable_slot(slot);
197 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
199 struct slot *slot = hotplug_slot->private;
202 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
203 __func__, slot_name(slot));
205 retval = slot->hpc_ops->get_power_status(slot, value);
207 *value = hotplug_slot->info->power_status;
212 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
214 struct slot *slot = hotplug_slot->private;
217 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
218 __func__, slot_name(slot));
220 retval = slot->hpc_ops->get_attention_status(slot, value);
222 *value = hotplug_slot->info->attention_status;
227 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
229 struct slot *slot = hotplug_slot->private;
232 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
233 __func__, slot_name(slot));
235 retval = slot->hpc_ops->get_latch_status(slot, value);
237 *value = hotplug_slot->info->latch_status;
242 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
244 struct slot *slot = hotplug_slot->private;
247 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
248 __func__, slot_name(slot));
250 retval = slot->hpc_ops->get_adapter_status(slot, value);
252 *value = hotplug_slot->info->adapter_status;
257 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
258 enum pci_bus_speed *value)
260 struct slot *slot = hotplug_slot->private;
263 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
264 __func__, slot_name(slot));
266 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
268 *value = PCI_SPEED_UNKNOWN;
273 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
275 struct slot *slot = hotplug_slot->private;
278 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
279 __func__, slot_name(slot));
281 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
283 *value = PCI_SPEED_UNKNOWN;
288 static int pciehp_probe(struct pcie_device *dev)
291 struct controller *ctrl;
294 struct pci_dev *pdev = dev->port;
297 dev_info(&dev->device,
298 "Bypassing BIOS check for pciehp use on %s\n",
300 else if (pciehp_get_hp_hw_control_from_firmware(pdev))
303 ctrl = pcie_init(dev);
305 dev_err(&dev->device, "Controller initialization failed\n");
308 set_service_data(dev, ctrl);
310 /* Setup the slot information structures */
311 rc = init_slot(ctrl);
314 ctrl_warn(ctrl, "Slot already registered by another "
317 ctrl_err(ctrl, "Slot initialization failed\n");
318 goto err_out_release_ctlr;
321 /* Enable events after we have setup the data structures */
322 rc = pcie_init_notification(ctrl);
324 ctrl_err(ctrl, "Notification initialization failed\n");
325 goto err_out_release_ctlr;
328 /* Check if slot is occupied */
330 slot->hpc_ops->get_adapter_status(slot, &value);
333 pciehp_enable_slot(slot);
335 /* Power off slot if not occupied */
336 if (POWER_CTRL(ctrl)) {
337 rc = slot->hpc_ops->power_off_slot(slot);
339 goto err_out_free_ctrl_slot;
345 err_out_free_ctrl_slot:
347 err_out_release_ctlr:
348 ctrl->hpc_ops->release_ctlr(ctrl);
353 static void pciehp_remove (struct pcie_device *dev)
355 struct controller *ctrl = get_service_data(dev);
358 ctrl->hpc_ops->release_ctlr(ctrl);
362 static int pciehp_suspend (struct pcie_device *dev)
364 dev_info(&dev->device, "%s ENTRY\n", __func__);
368 static int pciehp_resume (struct pcie_device *dev)
370 dev_info(&dev->device, "%s ENTRY\n", __func__);
372 struct controller *ctrl = get_service_data(dev);
376 /* reinitialize the chipset's event detection logic */
377 pcie_enable_notification(ctrl);
381 /* Check if slot is occupied */
382 slot->hpc_ops->get_adapter_status(slot, &status);
384 pciehp_enable_slot(slot);
386 pciehp_disable_slot(slot);
392 static struct pcie_port_service_driver hpdriver_portdrv = {
393 .name = PCIE_MODULE_NAME,
394 .port_type = PCIE_ANY_PORT,
395 .service = PCIE_PORT_SERVICE_HP,
397 .probe = pciehp_probe,
398 .remove = pciehp_remove,
401 .suspend = pciehp_suspend,
402 .resume = pciehp_resume,
406 static int __init pcied_init(void)
410 pciehp_firmware_init();
411 retval = pcie_port_service_register(&hpdriver_portdrv);
412 dbg("pcie_port_service_register = %d\n", retval);
413 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
415 dbg("Failure to register service\n");
419 static void __exit pcied_cleanup(void)
421 dbg("unload_pciehpd()\n");
422 pcie_port_service_unregister(&hpdriver_portdrv);
423 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
426 module_init(pcied_init);
427 module_exit(pcied_cleanup);