usb: Using correct way to clear usb3.0 device's remote wakeup feature.
[~shefty/rdma-dev.git] / drivers / pci / hotplug / shpchp_core.c
1 /*
2  * Standard Hot Plug Controller Driver
3  *
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
8  *
9  * All rights reserved.
10  *
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.
15  *
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
20  * details.
21  *
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.
25  *
26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27  *
28  */
29
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>
36 #include "shpchp.h"
37
38 /* Global variables */
39 bool shpchp_debug;
40 bool shpchp_poll_mode;
41 int shpchp_poll_time;
42 struct workqueue_struct *shpchp_wq;
43 struct workqueue_struct *shpchp_ordered_wq;
44
45 #define DRIVER_VERSION  "0.4"
46 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
47 #define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
48
49 MODULE_AUTHOR(DRIVER_AUTHOR);
50 MODULE_DESCRIPTION(DRIVER_DESC);
51 MODULE_LICENSE("GPL");
52
53 module_param(shpchp_debug, bool, 0644);
54 module_param(shpchp_poll_mode, bool, 0644);
55 module_param(shpchp_poll_time, int, 0644);
56 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
57 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
58 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
59
60 #define SHPC_MODULE_NAME "shpchp"
61
62 static int set_attention_status (struct hotplug_slot *slot, u8 value);
63 static int enable_slot          (struct hotplug_slot *slot);
64 static int disable_slot         (struct hotplug_slot *slot);
65 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
66 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
67 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
68 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
69
70 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
71         .set_attention_status = set_attention_status,
72         .enable_slot =          enable_slot,
73         .disable_slot =         disable_slot,
74         .get_power_status =     get_power_status,
75         .get_attention_status = get_attention_status,
76         .get_latch_status =     get_latch_status,
77         .get_adapter_status =   get_adapter_status,
78 };
79
80 /**
81  * release_slot - free up the memory used by a slot
82  * @hotplug_slot: slot to free
83  */
84 static void release_slot(struct hotplug_slot *hotplug_slot)
85 {
86         struct slot *slot = hotplug_slot->private;
87
88         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
89                  __func__, slot_name(slot));
90
91         kfree(slot->hotplug_slot->info);
92         kfree(slot->hotplug_slot);
93         kfree(slot);
94 }
95
96 static int init_slots(struct controller *ctrl)
97 {
98         struct slot *slot;
99         struct hotplug_slot *hotplug_slot;
100         struct hotplug_slot_info *info;
101         char name[SLOT_NAME_SIZE];
102         int retval;
103         int i;
104
105         for (i = 0; i < ctrl->num_slots; i++) {
106                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
107                 if (!slot) {
108                         retval = -ENOMEM;
109                         goto error;
110                 }
111
112                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
113                 if (!hotplug_slot) {
114                         retval = -ENOMEM;
115                         goto error_slot;
116                 }
117                 slot->hotplug_slot = hotplug_slot;
118
119                 info = kzalloc(sizeof(*info), GFP_KERNEL);
120                 if (!info) {
121                         retval = -ENOMEM;
122                         goto error_hpslot;
123                 }
124                 hotplug_slot->info = info;
125
126                 slot->hp_slot = i;
127                 slot->ctrl = ctrl;
128                 slot->bus = ctrl->pci_dev->subordinate->number;
129                 slot->device = ctrl->slot_device_offset + i;
130                 slot->hpc_ops = ctrl->hpc_ops;
131                 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
132                 mutex_init(&slot->lock);
133                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
134
135                 /* register this slot with the hotplug pci core */
136                 hotplug_slot->private = slot;
137                 hotplug_slot->release = &release_slot;
138                 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
139                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
140
141                 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
142                          "hp_slot=%x sun=%x slot_device_offset=%x\n",
143                          pci_domain_nr(ctrl->pci_dev->subordinate),
144                          slot->bus, slot->device, slot->hp_slot, slot->number,
145                          ctrl->slot_device_offset);
146                 retval = pci_hp_register(slot->hotplug_slot,
147                                 ctrl->pci_dev->subordinate, slot->device, name);
148                 if (retval) {
149                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
150                                  retval);
151                         goto error_info;
152                 }
153
154                 get_power_status(hotplug_slot, &info->power_status);
155                 get_attention_status(hotplug_slot, &info->attention_status);
156                 get_latch_status(hotplug_slot, &info->latch_status);
157                 get_adapter_status(hotplug_slot, &info->adapter_status);
158
159                 list_add(&slot->slot_list, &ctrl->slot_list);
160         }
161
162         return 0;
163 error_info:
164         kfree(info);
165 error_hpslot:
166         kfree(hotplug_slot);
167 error_slot:
168         kfree(slot);
169 error:
170         return retval;
171 }
172
173 void cleanup_slots(struct controller *ctrl)
174 {
175         struct list_head *tmp;
176         struct list_head *next;
177         struct slot *slot;
178
179         list_for_each_safe(tmp, next, &ctrl->slot_list) {
180                 slot = list_entry(tmp, struct slot, slot_list);
181                 list_del(&slot->slot_list);
182                 cancel_delayed_work(&slot->work);
183                 flush_workqueue(shpchp_wq);
184                 flush_workqueue(shpchp_ordered_wq);
185                 pci_hp_deregister(slot->hotplug_slot);
186         }
187 }
188
189 /*
190  * set_attention_status - Turns the Amber LED for a slot on, off or blink
191  */
192 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
193 {
194         struct slot *slot = get_slot(hotplug_slot);
195
196         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
197                  __func__, slot_name(slot));
198
199         hotplug_slot->info->attention_status = status;
200         slot->hpc_ops->set_attention_status(slot, status);
201
202         return 0;
203 }
204
205 static int enable_slot (struct hotplug_slot *hotplug_slot)
206 {
207         struct slot *slot = get_slot(hotplug_slot);
208
209         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
210                  __func__, slot_name(slot));
211
212         return shpchp_sysfs_enable_slot(slot);
213 }
214
215 static int disable_slot (struct hotplug_slot *hotplug_slot)
216 {
217         struct slot *slot = get_slot(hotplug_slot);
218
219         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
220                  __func__, slot_name(slot));
221
222         return shpchp_sysfs_disable_slot(slot);
223 }
224
225 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
226 {
227         struct slot *slot = get_slot(hotplug_slot);
228         int retval;
229
230         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
231                  __func__, slot_name(slot));
232
233         retval = slot->hpc_ops->get_power_status(slot, value);
234         if (retval < 0)
235                 *value = hotplug_slot->info->power_status;
236
237         return 0;
238 }
239
240 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
241 {
242         struct slot *slot = get_slot(hotplug_slot);
243         int retval;
244
245         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
246                  __func__, slot_name(slot));
247
248         retval = slot->hpc_ops->get_attention_status(slot, value);
249         if (retval < 0)
250                 *value = hotplug_slot->info->attention_status;
251
252         return 0;
253 }
254
255 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
256 {
257         struct slot *slot = get_slot(hotplug_slot);
258         int retval;
259
260         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
261                  __func__, slot_name(slot));
262
263         retval = slot->hpc_ops->get_latch_status(slot, value);
264         if (retval < 0)
265                 *value = hotplug_slot->info->latch_status;
266
267         return 0;
268 }
269
270 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
271 {
272         struct slot *slot = get_slot(hotplug_slot);
273         int retval;
274
275         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
276                  __func__, slot_name(slot));
277
278         retval = slot->hpc_ops->get_adapter_status(slot, value);
279         if (retval < 0)
280                 *value = hotplug_slot->info->adapter_status;
281
282         return 0;
283 }
284
285 static int is_shpc_capable(struct pci_dev *dev)
286 {
287         if (dev->vendor == PCI_VENDOR_ID_AMD &&
288             dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
289                 return 1;
290         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
291                 return 0;
292         if (get_hp_hw_control_from_firmware(dev))
293                 return 0;
294         return 1;
295 }
296
297 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
298 {
299         int rc;
300         struct controller *ctrl;
301
302         if (!is_shpc_capable(pdev))
303                 return -ENODEV;
304
305         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
306         if (!ctrl) {
307                 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
308                 goto err_out_none;
309         }
310         INIT_LIST_HEAD(&ctrl->slot_list);
311
312         rc = shpc_init(ctrl, pdev);
313         if (rc) {
314                 ctrl_dbg(ctrl, "Controller initialization failed\n");
315                 goto err_out_free_ctrl;
316         }
317
318         pci_set_drvdata(pdev, ctrl);
319
320         /* Setup the slot information structures */
321         rc = init_slots(ctrl);
322         if (rc) {
323                 ctrl_err(ctrl, "Slot initialization failed\n");
324                 goto err_out_release_ctlr;
325         }
326
327         rc = shpchp_create_ctrl_files(ctrl);
328         if (rc)
329                 goto err_cleanup_slots;
330
331         return 0;
332
333 err_cleanup_slots:
334         cleanup_slots(ctrl);
335 err_out_release_ctlr:
336         ctrl->hpc_ops->release_ctlr(ctrl);
337 err_out_free_ctrl:
338         kfree(ctrl);
339 err_out_none:
340         return -ENODEV;
341 }
342
343 static void shpc_remove(struct pci_dev *dev)
344 {
345         struct controller *ctrl = pci_get_drvdata(dev);
346
347         shpchp_remove_ctrl_files(ctrl);
348         ctrl->hpc_ops->release_ctlr(ctrl);
349         kfree(ctrl);
350 }
351
352 static struct pci_device_id shpcd_pci_tbl[] = {
353         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
354         { /* end: all zeroes */ }
355 };
356 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
357
358 static struct pci_driver shpc_driver = {
359         .name =         SHPC_MODULE_NAME,
360         .id_table =     shpcd_pci_tbl,
361         .probe =        shpc_probe,
362         .remove =       shpc_remove,
363 };
364
365 static int __init shpcd_init(void)
366 {
367         int retval = 0;
368
369         shpchp_wq = alloc_ordered_workqueue("shpchp", 0);
370         if (!shpchp_wq)
371                 return -ENOMEM;
372
373         shpchp_ordered_wq = alloc_ordered_workqueue("shpchp_ordered", 0);
374         if (!shpchp_ordered_wq) {
375                 destroy_workqueue(shpchp_wq);
376                 return -ENOMEM;
377         }
378
379         retval = pci_register_driver(&shpc_driver);
380         dbg("%s: pci_register_driver = %d\n", __func__, retval);
381         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
382         if (retval) {
383                 destroy_workqueue(shpchp_ordered_wq);
384                 destroy_workqueue(shpchp_wq);
385         }
386         return retval;
387 }
388
389 static void __exit shpcd_cleanup(void)
390 {
391         dbg("unload_shpchpd()\n");
392         pci_unregister_driver(&shpc_driver);
393         destroy_workqueue(shpchp_ordered_wq);
394         destroy_workqueue(shpchp_wq);
395         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
396 }
397
398 module_init(shpcd_init);
399 module_exit(shpcd_cleanup);