Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / 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/pci.h>
35 #include <linux/workqueue.h>
36 #include "shpchp.h"
37
38 /* Global variables */
39 int shpchp_debug;
40 int shpchp_poll_mode;
41 int shpchp_poll_time;
42 static int shpchp_slot_with_bus;
43 struct workqueue_struct *shpchp_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_param(shpchp_slot_with_bus, bool, 0644);
57 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
58 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
59 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
60 MODULE_PARM_DESC(shpchp_slot_with_bus, "Use bus number in the slot name");
61
62 #define SHPC_MODULE_NAME "shpchp"
63
64 static int set_attention_status (struct hotplug_slot *slot, u8 value);
65 static int enable_slot          (struct hotplug_slot *slot);
66 static int disable_slot         (struct hotplug_slot *slot);
67 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
68 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
69 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
70 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
71 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
72 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
73
74 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
75         .owner =                THIS_MODULE,
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,
85 };
86
87 /**
88  * release_slot - free up the memory used by a slot
89  * @hotplug_slot: slot to free
90  */
91 static void release_slot(struct hotplug_slot *hotplug_slot)
92 {
93         struct slot *slot = hotplug_slot->private;
94
95         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
96
97         kfree(slot->hotplug_slot->info);
98         kfree(slot->hotplug_slot);
99         kfree(slot);
100 }
101
102 static void make_slot_name(struct slot *slot)
103 {
104         if (shpchp_slot_with_bus)
105                 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
106                          slot->bus, slot->number);
107         else
108                 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d",
109                          slot->number);
110 }
111
112 static int init_slots(struct controller *ctrl)
113 {
114         struct slot *slot;
115         struct hotplug_slot *hotplug_slot;
116         struct hotplug_slot_info *info;
117         int retval = -ENOMEM;
118         int i;
119
120         for (i = 0; i < ctrl->num_slots; i++) {
121                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
122                 if (!slot)
123                         goto error;
124
125                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
126                 if (!hotplug_slot)
127                         goto error_slot;
128                 slot->hotplug_slot = hotplug_slot;
129
130                 info = kzalloc(sizeof(*info), GFP_KERNEL);
131                 if (!info)
132                         goto error_hpslot;
133                 hotplug_slot->info = info;
134
135                 hotplug_slot->name = slot->name;
136
137                 slot->hp_slot = i;
138                 slot->ctrl = ctrl;
139                 slot->bus = ctrl->pci_dev->subordinate->number;
140                 slot->device = ctrl->slot_device_offset + i;
141                 slot->hpc_ops = ctrl->hpc_ops;
142                 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
143                 mutex_init(&slot->lock);
144                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
145
146                 /* register this slot with the hotplug pci core */
147                 hotplug_slot->private = slot;
148                 hotplug_slot->release = &release_slot;
149                 make_slot_name(slot);
150                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
151
152                 get_power_status(hotplug_slot, &info->power_status);
153                 get_attention_status(hotplug_slot, &info->attention_status);
154                 get_latch_status(hotplug_slot, &info->latch_status);
155                 get_adapter_status(hotplug_slot, &info->adapter_status);
156
157                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
158                     "slot_device_offset=%x\n", slot->bus, slot->device,
159                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
160                 retval = pci_hp_register(slot->hotplug_slot,
161                                 ctrl->pci_dev->subordinate, slot->device);
162                 if (retval) {
163                         err("pci_hp_register failed with error %d\n", retval);
164                         if (retval == -EEXIST)
165                                 err("Failed to register slot because of name "
166                                     "collision. Try \'shpchp_slot_with_bus\' "
167                                     "module option.\n");
168                         goto error_info;
169                 }
170
171                 list_add(&slot->slot_list, &ctrl->slot_list);
172         }
173
174         return 0;
175 error_info:
176         kfree(info);
177 error_hpslot:
178         kfree(hotplug_slot);
179 error_slot:
180         kfree(slot);
181 error:
182         return retval;
183 }
184
185 void cleanup_slots(struct controller *ctrl)
186 {
187         struct list_head *tmp;
188         struct list_head *next;
189         struct slot *slot;
190
191         list_for_each_safe(tmp, next, &ctrl->slot_list) {
192                 slot = list_entry(tmp, struct slot, slot_list);
193                 list_del(&slot->slot_list);
194                 cancel_delayed_work(&slot->work);
195                 flush_scheduled_work();
196                 flush_workqueue(shpchp_wq);
197                 pci_hp_deregister(slot->hotplug_slot);
198         }
199 }
200
201 /*
202  * set_attention_status - Turns the Amber LED for a slot on, off or blink
203  */
204 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
205 {
206         struct slot *slot = get_slot(hotplug_slot);
207
208         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
209
210         hotplug_slot->info->attention_status = status;
211         slot->hpc_ops->set_attention_status(slot, status);
212
213         return 0;
214 }
215
216 static int enable_slot (struct hotplug_slot *hotplug_slot)
217 {
218         struct slot *slot = get_slot(hotplug_slot);
219
220         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
221
222         return shpchp_sysfs_enable_slot(slot);
223 }
224
225 static int disable_slot (struct hotplug_slot *hotplug_slot)
226 {
227         struct slot *slot = get_slot(hotplug_slot);
228
229         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
230
231         return shpchp_sysfs_disable_slot(slot);
232 }
233
234 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
235 {
236         struct slot *slot = get_slot(hotplug_slot);
237         int retval;
238
239         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
240
241         retval = slot->hpc_ops->get_power_status(slot, value);
242         if (retval < 0)
243                 *value = hotplug_slot->info->power_status;
244
245         return 0;
246 }
247
248 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
249 {
250         struct slot *slot = get_slot(hotplug_slot);
251         int retval;
252
253         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
254
255         retval = slot->hpc_ops->get_attention_status(slot, value);
256         if (retval < 0)
257                 *value = hotplug_slot->info->attention_status;
258
259         return 0;
260 }
261
262 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
263 {
264         struct slot *slot = get_slot(hotplug_slot);
265         int retval;
266
267         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
268
269         retval = slot->hpc_ops->get_latch_status(slot, value);
270         if (retval < 0)
271                 *value = hotplug_slot->info->latch_status;
272
273         return 0;
274 }
275
276 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
277 {
278         struct slot *slot = get_slot(hotplug_slot);
279         int retval;
280
281         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
282
283         retval = slot->hpc_ops->get_adapter_status(slot, value);
284         if (retval < 0)
285                 *value = hotplug_slot->info->adapter_status;
286
287         return 0;
288 }
289
290 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
291                                 enum pci_bus_speed *value)
292 {
293         struct slot *slot = get_slot(hotplug_slot);
294         int retval;
295
296         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
297
298         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
299         if (retval < 0)
300                 *value = PCI_SPEED_UNKNOWN;
301
302         return 0;
303 }
304
305 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
306 {
307         struct slot *slot = get_slot(hotplug_slot);
308         int retval;
309
310         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
311
312         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
313         if (retval < 0)
314                 *value = PCI_SPEED_UNKNOWN;
315
316         return 0;
317 }
318
319 static int is_shpc_capable(struct pci_dev *dev)
320 {
321         if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
322                                                 PCI_DEVICE_ID_AMD_GOLAM_7450))
323                 return 1;
324         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
325                 return 0;
326         if (get_hp_hw_control_from_firmware(dev))
327                 return 0;
328         return 1;
329 }
330
331 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
332 {
333         int rc;
334         struct controller *ctrl;
335
336         if (!is_shpc_capable(pdev))
337                 return -ENODEV;
338
339         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
340         if (!ctrl) {
341                 err("%s : out of memory\n", __func__);
342                 goto err_out_none;
343         }
344         INIT_LIST_HEAD(&ctrl->slot_list);
345
346         rc = shpc_init(ctrl, pdev);
347         if (rc) {
348                 dbg("%s: controller initialization failed\n",
349                     SHPC_MODULE_NAME);
350                 goto err_out_free_ctrl;
351         }
352
353         pci_set_drvdata(pdev, ctrl);
354
355         /* Setup the slot information structures */
356         rc = init_slots(ctrl);
357         if (rc) {
358                 err("%s: slot initialization failed\n", SHPC_MODULE_NAME);
359                 goto err_out_release_ctlr;
360         }
361
362         rc = shpchp_create_ctrl_files(ctrl);
363         if (rc)
364                 goto err_cleanup_slots;
365
366         return 0;
367
368 err_cleanup_slots:
369         cleanup_slots(ctrl);
370 err_out_release_ctlr:
371         ctrl->hpc_ops->release_ctlr(ctrl);
372 err_out_free_ctrl:
373         kfree(ctrl);
374 err_out_none:
375         return -ENODEV;
376 }
377
378 static void shpc_remove(struct pci_dev *dev)
379 {
380         struct controller *ctrl = pci_get_drvdata(dev);
381
382         shpchp_remove_ctrl_files(ctrl);
383         ctrl->hpc_ops->release_ctlr(ctrl);
384         kfree(ctrl);
385 }
386
387 static struct pci_device_id shpcd_pci_tbl[] = {
388         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
389         { /* end: all zeroes */ }
390 };
391 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
392
393 static struct pci_driver shpc_driver = {
394         .name =         SHPC_MODULE_NAME,
395         .id_table =     shpcd_pci_tbl,
396         .probe =        shpc_probe,
397         .remove =       shpc_remove,
398 };
399
400 static int __init shpcd_init(void)
401 {
402         int retval = 0;
403
404         retval = pci_register_driver(&shpc_driver);
405         dbg("%s: pci_register_driver = %d\n", __func__, retval);
406         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
407         return retval;
408 }
409
410 static void __exit shpcd_cleanup(void)
411 {
412         dbg("unload_shpchpd()\n");
413         pci_unregister_driver(&shpc_driver);
414         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
415 }
416
417 module_init(shpcd_init);
418 module_exit(shpcd_cleanup);