2 * Standard 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>
35 #include <linux/workqueue.h>
38 /* Global variables */
42 struct workqueue_struct *shpchp_wq;
44 #define DRIVER_VERSION "0.4"
45 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
46 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
48 MODULE_AUTHOR(DRIVER_AUTHOR);
49 MODULE_DESCRIPTION(DRIVER_DESC);
50 MODULE_LICENSE("GPL");
52 module_param(shpchp_debug, bool, 0644);
53 module_param(shpchp_poll_mode, bool, 0644);
54 module_param(shpchp_poll_time, int, 0644);
55 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
56 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
57 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
59 #define SHPC_MODULE_NAME "shpchp"
61 static int set_attention_status (struct hotplug_slot *slot, u8 value);
62 static int enable_slot (struct hotplug_slot *slot);
63 static int disable_slot (struct hotplug_slot *slot);
64 static int get_power_status (struct hotplug_slot *slot, u8 *value);
65 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
66 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
67 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
68 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
69 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
71 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
73 .set_attention_status = set_attention_status,
74 .enable_slot = enable_slot,
75 .disable_slot = disable_slot,
76 .get_power_status = get_power_status,
77 .get_attention_status = get_attention_status,
78 .get_latch_status = get_latch_status,
79 .get_adapter_status = get_adapter_status,
80 .get_max_bus_speed = get_max_bus_speed,
81 .get_cur_bus_speed = get_cur_bus_speed,
85 * release_slot - free up the memory used by a slot
86 * @hotplug_slot: slot to free
88 static void release_slot(struct hotplug_slot *hotplug_slot)
90 struct slot *slot = hotplug_slot->private;
92 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
94 kfree(slot->hotplug_slot->info);
95 kfree(slot->hotplug_slot);
99 static int init_slots(struct controller *ctrl)
102 struct hotplug_slot *hotplug_slot;
103 struct hotplug_slot_info *info;
104 char name[SLOT_NAME_SIZE];
105 int retval = -ENOMEM;
108 for (i = 0; i < ctrl->num_slots; i++) {
109 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
113 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
116 slot->hotplug_slot = hotplug_slot;
118 info = kzalloc(sizeof(*info), GFP_KERNEL);
121 hotplug_slot->info = info;
125 slot->bus = ctrl->pci_dev->subordinate->number;
126 slot->device = ctrl->slot_device_offset + i;
127 slot->hpc_ops = ctrl->hpc_ops;
128 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
129 mutex_init(&slot->lock);
130 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
132 /* register this slot with the hotplug pci core */
133 hotplug_slot->private = slot;
134 hotplug_slot->release = &release_slot;
135 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
136 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
138 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
139 "slot_device_offset=%x\n", slot->bus, slot->device,
140 slot->hp_slot, slot->number, ctrl->slot_device_offset);
141 retval = pci_hp_register(slot->hotplug_slot,
142 ctrl->pci_dev->subordinate, slot->device, name);
144 err("pci_hp_register failed with error %d\n", retval);
148 get_power_status(hotplug_slot, &info->power_status);
149 get_attention_status(hotplug_slot, &info->attention_status);
150 get_latch_status(hotplug_slot, &info->latch_status);
151 get_adapter_status(hotplug_slot, &info->adapter_status);
153 list_add(&slot->slot_list, &ctrl->slot_list);
167 void cleanup_slots(struct controller *ctrl)
169 struct list_head *tmp;
170 struct list_head *next;
173 list_for_each_safe(tmp, next, &ctrl->slot_list) {
174 slot = list_entry(tmp, struct slot, slot_list);
175 list_del(&slot->slot_list);
176 cancel_delayed_work(&slot->work);
177 flush_scheduled_work();
178 flush_workqueue(shpchp_wq);
179 pci_hp_deregister(slot->hotplug_slot);
184 * set_attention_status - Turns the Amber LED for a slot on, off or blink
186 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
188 struct slot *slot = get_slot(hotplug_slot);
190 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
192 hotplug_slot->info->attention_status = status;
193 slot->hpc_ops->set_attention_status(slot, status);
198 static int enable_slot (struct hotplug_slot *hotplug_slot)
200 struct slot *slot = get_slot(hotplug_slot);
202 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
204 return shpchp_sysfs_enable_slot(slot);
207 static int disable_slot (struct hotplug_slot *hotplug_slot)
209 struct slot *slot = get_slot(hotplug_slot);
211 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
213 return shpchp_sysfs_disable_slot(slot);
216 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
218 struct slot *slot = get_slot(hotplug_slot);
221 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
223 retval = slot->hpc_ops->get_power_status(slot, value);
225 *value = hotplug_slot->info->power_status;
230 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
232 struct slot *slot = get_slot(hotplug_slot);
235 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
237 retval = slot->hpc_ops->get_attention_status(slot, value);
239 *value = hotplug_slot->info->attention_status;
244 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
246 struct slot *slot = get_slot(hotplug_slot);
249 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
251 retval = slot->hpc_ops->get_latch_status(slot, value);
253 *value = hotplug_slot->info->latch_status;
258 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
260 struct slot *slot = get_slot(hotplug_slot);
263 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
265 retval = slot->hpc_ops->get_adapter_status(slot, value);
267 *value = hotplug_slot->info->adapter_status;
272 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
273 enum pci_bus_speed *value)
275 struct slot *slot = get_slot(hotplug_slot);
278 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
280 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
282 *value = PCI_SPEED_UNKNOWN;
287 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
289 struct slot *slot = get_slot(hotplug_slot);
292 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
294 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
296 *value = PCI_SPEED_UNKNOWN;
301 static int is_shpc_capable(struct pci_dev *dev)
303 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
304 PCI_DEVICE_ID_AMD_GOLAM_7450))
306 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
308 if (get_hp_hw_control_from_firmware(dev))
313 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
316 struct controller *ctrl;
318 if (!is_shpc_capable(pdev))
321 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
323 err("%s : out of memory\n", __func__);
326 INIT_LIST_HEAD(&ctrl->slot_list);
328 rc = shpc_init(ctrl, pdev);
330 dbg("%s: controller initialization failed\n",
332 goto err_out_free_ctrl;
335 pci_set_drvdata(pdev, ctrl);
337 /* Setup the slot information structures */
338 rc = init_slots(ctrl);
340 err("%s: slot initialization failed\n", SHPC_MODULE_NAME);
341 goto err_out_release_ctlr;
344 rc = shpchp_create_ctrl_files(ctrl);
346 goto err_cleanup_slots;
352 err_out_release_ctlr:
353 ctrl->hpc_ops->release_ctlr(ctrl);
360 static void shpc_remove(struct pci_dev *dev)
362 struct controller *ctrl = pci_get_drvdata(dev);
364 shpchp_remove_ctrl_files(ctrl);
365 ctrl->hpc_ops->release_ctlr(ctrl);
369 static struct pci_device_id shpcd_pci_tbl[] = {
370 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
371 { /* end: all zeroes */ }
373 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
375 static struct pci_driver shpc_driver = {
376 .name = SHPC_MODULE_NAME,
377 .id_table = shpcd_pci_tbl,
379 .remove = shpc_remove,
382 static int __init shpcd_init(void)
386 retval = pci_register_driver(&shpc_driver);
387 dbg("%s: pci_register_driver = %d\n", __func__, retval);
388 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
392 static void __exit shpcd_cleanup(void)
394 dbg("unload_shpchpd()\n");
395 pci_unregister_driver(&shpc_driver);
396 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
399 module_init(shpcd_init);
400 module_exit(shpcd_cleanup);