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);
69 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
70 .set_attention_status = set_attention_status,
71 .enable_slot = enable_slot,
72 .disable_slot = disable_slot,
73 .get_power_status = get_power_status,
74 .get_attention_status = get_attention_status,
75 .get_latch_status = get_latch_status,
76 .get_adapter_status = get_adapter_status,
80 * release_slot - free up the memory used by a slot
81 * @hotplug_slot: slot to free
83 static void release_slot(struct hotplug_slot *hotplug_slot)
85 struct slot *slot = hotplug_slot->private;
87 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
88 __func__, slot_name(slot));
90 kfree(slot->hotplug_slot->info);
91 kfree(slot->hotplug_slot);
95 static int init_slots(struct controller *ctrl)
98 struct hotplug_slot *hotplug_slot;
99 struct hotplug_slot_info *info;
100 char name[SLOT_NAME_SIZE];
101 int retval = -ENOMEM;
104 for (i = 0; i < ctrl->num_slots; i++) {
105 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
109 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
112 slot->hotplug_slot = hotplug_slot;
114 info = kzalloc(sizeof(*info), GFP_KERNEL);
117 hotplug_slot->info = info;
121 slot->bus = ctrl->pci_dev->subordinate->number;
122 slot->device = ctrl->slot_device_offset + i;
123 slot->hpc_ops = ctrl->hpc_ops;
124 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
125 mutex_init(&slot->lock);
126 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
128 /* register this slot with the hotplug pci core */
129 hotplug_slot->private = slot;
130 hotplug_slot->release = &release_slot;
131 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
132 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
134 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
135 "hp_slot=%x sun=%x slot_device_offset=%x\n",
136 pci_domain_nr(ctrl->pci_dev->subordinate),
137 slot->bus, slot->device, slot->hp_slot, slot->number,
138 ctrl->slot_device_offset);
139 retval = pci_hp_register(slot->hotplug_slot,
140 ctrl->pci_dev->subordinate, slot->device, name);
142 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
147 get_power_status(hotplug_slot, &info->power_status);
148 get_attention_status(hotplug_slot, &info->attention_status);
149 get_latch_status(hotplug_slot, &info->latch_status);
150 get_adapter_status(hotplug_slot, &info->adapter_status);
152 list_add(&slot->slot_list, &ctrl->slot_list);
166 void cleanup_slots(struct controller *ctrl)
168 struct list_head *tmp;
169 struct list_head *next;
172 list_for_each_safe(tmp, next, &ctrl->slot_list) {
173 slot = list_entry(tmp, struct slot, slot_list);
174 list_del(&slot->slot_list);
175 cancel_delayed_work(&slot->work);
176 flush_scheduled_work();
177 flush_workqueue(shpchp_wq);
178 pci_hp_deregister(slot->hotplug_slot);
183 * set_attention_status - Turns the Amber LED for a slot on, off or blink
185 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
187 struct slot *slot = get_slot(hotplug_slot);
189 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
190 __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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
203 __func__, slot_name(slot));
205 return shpchp_sysfs_enable_slot(slot);
208 static int disable_slot (struct hotplug_slot *hotplug_slot)
210 struct slot *slot = get_slot(hotplug_slot);
212 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
213 __func__, slot_name(slot));
215 return shpchp_sysfs_disable_slot(slot);
218 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
220 struct slot *slot = get_slot(hotplug_slot);
223 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
224 __func__, slot_name(slot));
226 retval = slot->hpc_ops->get_power_status(slot, value);
228 *value = hotplug_slot->info->power_status;
233 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
235 struct slot *slot = get_slot(hotplug_slot);
238 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
239 __func__, slot_name(slot));
241 retval = slot->hpc_ops->get_attention_status(slot, value);
243 *value = hotplug_slot->info->attention_status;
248 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
250 struct slot *slot = get_slot(hotplug_slot);
253 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
254 __func__, slot_name(slot));
256 retval = slot->hpc_ops->get_latch_status(slot, value);
258 *value = hotplug_slot->info->latch_status;
263 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
265 struct slot *slot = get_slot(hotplug_slot);
268 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
269 __func__, slot_name(slot));
271 retval = slot->hpc_ops->get_adapter_status(slot, value);
273 *value = hotplug_slot->info->adapter_status;
278 static int is_shpc_capable(struct pci_dev *dev)
280 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
281 PCI_DEVICE_ID_AMD_GOLAM_7450))
283 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
285 if (get_hp_hw_control_from_firmware(dev))
290 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
293 struct controller *ctrl;
295 if (!is_shpc_capable(pdev))
298 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
300 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
303 INIT_LIST_HEAD(&ctrl->slot_list);
305 rc = shpc_init(ctrl, pdev);
307 ctrl_dbg(ctrl, "Controller initialization failed\n");
308 goto err_out_free_ctrl;
311 pci_set_drvdata(pdev, ctrl);
313 /* Setup the slot information structures */
314 rc = init_slots(ctrl);
316 ctrl_err(ctrl, "Slot initialization failed\n");
317 goto err_out_release_ctlr;
320 rc = shpchp_create_ctrl_files(ctrl);
322 goto err_cleanup_slots;
328 err_out_release_ctlr:
329 ctrl->hpc_ops->release_ctlr(ctrl);
336 static void shpc_remove(struct pci_dev *dev)
338 struct controller *ctrl = pci_get_drvdata(dev);
340 shpchp_remove_ctrl_files(ctrl);
341 ctrl->hpc_ops->release_ctlr(ctrl);
345 static struct pci_device_id shpcd_pci_tbl[] = {
346 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
347 { /* end: all zeroes */ }
349 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
351 static struct pci_driver shpc_driver = {
352 .name = SHPC_MODULE_NAME,
353 .id_table = shpcd_pci_tbl,
355 .remove = shpc_remove,
358 static int __init shpcd_init(void)
362 retval = pci_register_driver(&shpc_driver);
363 dbg("%s: pci_register_driver = %d\n", __func__, retval);
364 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
368 static void __exit shpcd_cleanup(void)
370 dbg("unload_shpchpd()\n");
371 pci_unregister_driver(&shpc_driver);
372 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
375 module_init(shpcd_init);
376 module_exit(shpcd_cleanup);