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/slab.h>
35 #include <linux/pci.h>
38 /* Global variables */
40 bool shpchp_poll_mode;
43 #define DRIVER_VERSION "0.4"
44 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
45 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
47 MODULE_AUTHOR(DRIVER_AUTHOR);
48 MODULE_DESCRIPTION(DRIVER_DESC);
49 MODULE_LICENSE("GPL");
51 module_param(shpchp_debug, bool, 0644);
52 module_param(shpchp_poll_mode, bool, 0644);
53 module_param(shpchp_poll_time, int, 0644);
54 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
55 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
56 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
58 #define SHPC_MODULE_NAME "shpchp"
60 static int set_attention_status (struct hotplug_slot *slot, u8 value);
61 static int enable_slot (struct hotplug_slot *slot);
62 static int disable_slot (struct hotplug_slot *slot);
63 static int get_power_status (struct hotplug_slot *slot, u8 *value);
64 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
65 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
66 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
68 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
69 .set_attention_status = set_attention_status,
70 .enable_slot = enable_slot,
71 .disable_slot = disable_slot,
72 .get_power_status = get_power_status,
73 .get_attention_status = get_attention_status,
74 .get_latch_status = get_latch_status,
75 .get_adapter_status = get_adapter_status,
79 * release_slot - free up the memory used by a slot
80 * @hotplug_slot: slot to free
82 static void release_slot(struct hotplug_slot *hotplug_slot)
84 struct slot *slot = hotplug_slot->private;
86 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
87 __func__, slot_name(slot));
89 kfree(slot->hotplug_slot->info);
90 kfree(slot->hotplug_slot);
94 static int init_slots(struct controller *ctrl)
97 struct hotplug_slot *hotplug_slot;
98 struct hotplug_slot_info *info;
99 char name[SLOT_NAME_SIZE];
103 for (i = 0; i < ctrl->num_slots; i++) {
104 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
110 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
115 slot->hotplug_slot = hotplug_slot;
117 info = kzalloc(sizeof(*info), GFP_KERNEL);
122 hotplug_slot->info = info;
126 slot->bus = ctrl->pci_dev->subordinate->number;
127 slot->device = ctrl->slot_device_offset + i;
128 slot->hpc_ops = ctrl->hpc_ops;
129 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
131 snprintf(name, sizeof(name), "shpchp-%d", slot->number);
132 slot->wq = alloc_workqueue(name, 0, 0);
138 mutex_init(&slot->lock);
139 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
141 /* register this slot with the hotplug pci core */
142 hotplug_slot->private = slot;
143 hotplug_slot->release = &release_slot;
144 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
145 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
147 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
148 "hp_slot=%x sun=%x slot_device_offset=%x\n",
149 pci_domain_nr(ctrl->pci_dev->subordinate),
150 slot->bus, slot->device, slot->hp_slot, slot->number,
151 ctrl->slot_device_offset);
152 retval = pci_hp_register(slot->hotplug_slot,
153 ctrl->pci_dev->subordinate, slot->device, name);
155 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
160 get_power_status(hotplug_slot, &info->power_status);
161 get_attention_status(hotplug_slot, &info->attention_status);
162 get_latch_status(hotplug_slot, &info->latch_status);
163 get_adapter_status(hotplug_slot, &info->adapter_status);
165 list_add(&slot->slot_list, &ctrl->slot_list);
170 destroy_workqueue(slot->wq);
181 void cleanup_slots(struct controller *ctrl)
183 struct list_head *tmp;
184 struct list_head *next;
187 list_for_each_safe(tmp, next, &ctrl->slot_list) {
188 slot = list_entry(tmp, struct slot, slot_list);
189 list_del(&slot->slot_list);
190 cancel_delayed_work(&slot->work);
191 destroy_workqueue(slot->wq);
192 pci_hp_deregister(slot->hotplug_slot);
197 * set_attention_status - Turns the Amber LED for a slot on, off or blink
199 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
201 struct slot *slot = get_slot(hotplug_slot);
203 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
204 __func__, slot_name(slot));
206 hotplug_slot->info->attention_status = status;
207 slot->hpc_ops->set_attention_status(slot, status);
212 static int enable_slot (struct hotplug_slot *hotplug_slot)
214 struct slot *slot = get_slot(hotplug_slot);
216 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
217 __func__, slot_name(slot));
219 return shpchp_sysfs_enable_slot(slot);
222 static int disable_slot (struct hotplug_slot *hotplug_slot)
224 struct slot *slot = get_slot(hotplug_slot);
226 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
227 __func__, slot_name(slot));
229 return shpchp_sysfs_disable_slot(slot);
232 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
234 struct slot *slot = get_slot(hotplug_slot);
237 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
238 __func__, slot_name(slot));
240 retval = slot->hpc_ops->get_power_status(slot, value);
242 *value = hotplug_slot->info->power_status;
247 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
249 struct slot *slot = get_slot(hotplug_slot);
252 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
253 __func__, slot_name(slot));
255 retval = slot->hpc_ops->get_attention_status(slot, value);
257 *value = hotplug_slot->info->attention_status;
262 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
264 struct slot *slot = get_slot(hotplug_slot);
267 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
268 __func__, slot_name(slot));
270 retval = slot->hpc_ops->get_latch_status(slot, value);
272 *value = hotplug_slot->info->latch_status;
277 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
279 struct slot *slot = get_slot(hotplug_slot);
282 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
283 __func__, slot_name(slot));
285 retval = slot->hpc_ops->get_adapter_status(slot, value);
287 *value = hotplug_slot->info->adapter_status;
292 static int is_shpc_capable(struct pci_dev *dev)
294 if (dev->vendor == PCI_VENDOR_ID_AMD &&
295 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
297 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
299 if (get_hp_hw_control_from_firmware(dev))
304 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
307 struct controller *ctrl;
309 if (!is_shpc_capable(pdev))
312 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
314 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
317 INIT_LIST_HEAD(&ctrl->slot_list);
319 rc = shpc_init(ctrl, pdev);
321 ctrl_dbg(ctrl, "Controller initialization failed\n");
322 goto err_out_free_ctrl;
325 pci_set_drvdata(pdev, ctrl);
327 /* Setup the slot information structures */
328 rc = init_slots(ctrl);
330 ctrl_err(ctrl, "Slot initialization failed\n");
331 goto err_out_release_ctlr;
334 rc = shpchp_create_ctrl_files(ctrl);
336 goto err_cleanup_slots;
342 err_out_release_ctlr:
343 ctrl->hpc_ops->release_ctlr(ctrl);
350 static void shpc_remove(struct pci_dev *dev)
352 struct controller *ctrl = pci_get_drvdata(dev);
354 shpchp_remove_ctrl_files(ctrl);
355 ctrl->hpc_ops->release_ctlr(ctrl);
359 static struct pci_device_id shpcd_pci_tbl[] = {
360 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
361 { /* end: all zeroes */ }
363 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
365 static struct pci_driver shpc_driver = {
366 .name = SHPC_MODULE_NAME,
367 .id_table = shpcd_pci_tbl,
369 .remove = shpc_remove,
372 static int __init shpcd_init(void)
376 retval = pci_register_driver(&shpc_driver);
377 dbg("%s: pci_register_driver = %d\n", __func__, retval);
378 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
383 static void __exit shpcd_cleanup(void)
385 dbg("unload_shpchpd()\n");
386 pci_unregister_driver(&shpc_driver);
387 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
390 module_init(shpcd_init);
391 module_exit(shpcd_cleanup);