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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 struct workqueue_struct *shpchp_wq;
43
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"
47
48 MODULE_AUTHOR(DRIVER_AUTHOR);
49 MODULE_DESCRIPTION(DRIVER_DESC);
50 MODULE_LICENSE("GPL");
51
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");
58
59 #define SHPC_MODULE_NAME "shpchp"
60
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);
70
71 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
72         .owner =                THIS_MODULE,
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,
82 };
83
84 /**
85  * release_slot - free up the memory used by a slot
86  * @hotplug_slot: slot to free
87  */
88 static void release_slot(struct hotplug_slot *hotplug_slot)
89 {
90         struct slot *slot = hotplug_slot->private;
91
92         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
93                  __func__, slot_name(slot));
94
95         kfree(slot->hotplug_slot->info);
96         kfree(slot->hotplug_slot);
97         kfree(slot);
98 }
99
100 static int init_slots(struct controller *ctrl)
101 {
102         struct slot *slot;
103         struct hotplug_slot *hotplug_slot;
104         struct hotplug_slot_info *info;
105         char name[SLOT_NAME_SIZE];
106         int retval = -ENOMEM;
107         int i;
108
109         for (i = 0; i < ctrl->num_slots; i++) {
110                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
111                 if (!slot)
112                         goto error;
113
114                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
115                 if (!hotplug_slot)
116                         goto error_slot;
117                 slot->hotplug_slot = hotplug_slot;
118
119                 info = kzalloc(sizeof(*info), GFP_KERNEL);
120                 if (!info)
121                         goto error_hpslot;
122                 hotplug_slot->info = info;
123
124                 slot->hp_slot = i;
125                 slot->ctrl = ctrl;
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);
130                 mutex_init(&slot->lock);
131                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
132
133                 /* register this slot with the hotplug pci core */
134                 hotplug_slot->private = slot;
135                 hotplug_slot->release = &release_slot;
136                 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
137                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
138
139                 ctrl_dbg(ctrl, "Registering bus=%x dev=%x hp_slot=%x sun=%x "
140                          "slot_device_offset=%x\n", slot->bus, slot->device,
141                          slot->hp_slot, slot->number, ctrl->slot_device_offset);
142                 retval = pci_hp_register(slot->hotplug_slot,
143                                 ctrl->pci_dev->subordinate, slot->device, name);
144                 if (retval) {
145                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
146                                  retval);
147                         goto error_info;
148                 }
149
150                 get_power_status(hotplug_slot, &info->power_status);
151                 get_attention_status(hotplug_slot, &info->attention_status);
152                 get_latch_status(hotplug_slot, &info->latch_status);
153                 get_adapter_status(hotplug_slot, &info->adapter_status);
154
155                 list_add(&slot->slot_list, &ctrl->slot_list);
156         }
157
158         return 0;
159 error_info:
160         kfree(info);
161 error_hpslot:
162         kfree(hotplug_slot);
163 error_slot:
164         kfree(slot);
165 error:
166         return retval;
167 }
168
169 void cleanup_slots(struct controller *ctrl)
170 {
171         struct list_head *tmp;
172         struct list_head *next;
173         struct slot *slot;
174
175         list_for_each_safe(tmp, next, &ctrl->slot_list) {
176                 slot = list_entry(tmp, struct slot, slot_list);
177                 list_del(&slot->slot_list);
178                 cancel_delayed_work(&slot->work);
179                 flush_scheduled_work();
180                 flush_workqueue(shpchp_wq);
181                 pci_hp_deregister(slot->hotplug_slot);
182         }
183 }
184
185 /*
186  * set_attention_status - Turns the Amber LED for a slot on, off or blink
187  */
188 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
189 {
190         struct slot *slot = get_slot(hotplug_slot);
191
192         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
193                  __func__, slot_name(slot));
194
195         hotplug_slot->info->attention_status = status;
196         slot->hpc_ops->set_attention_status(slot, status);
197
198         return 0;
199 }
200
201 static int enable_slot (struct hotplug_slot *hotplug_slot)
202 {
203         struct slot *slot = get_slot(hotplug_slot);
204
205         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
206                  __func__, slot_name(slot));
207
208         return shpchp_sysfs_enable_slot(slot);
209 }
210
211 static int disable_slot (struct hotplug_slot *hotplug_slot)
212 {
213         struct slot *slot = get_slot(hotplug_slot);
214
215         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
216                  __func__, slot_name(slot));
217
218         return shpchp_sysfs_disable_slot(slot);
219 }
220
221 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
222 {
223         struct slot *slot = get_slot(hotplug_slot);
224         int retval;
225
226         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
227                  __func__, slot_name(slot));
228
229         retval = slot->hpc_ops->get_power_status(slot, value);
230         if (retval < 0)
231                 *value = hotplug_slot->info->power_status;
232
233         return 0;
234 }
235
236 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
237 {
238         struct slot *slot = get_slot(hotplug_slot);
239         int retval;
240
241         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
242                  __func__, slot_name(slot));
243
244         retval = slot->hpc_ops->get_attention_status(slot, value);
245         if (retval < 0)
246                 *value = hotplug_slot->info->attention_status;
247
248         return 0;
249 }
250
251 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
252 {
253         struct slot *slot = get_slot(hotplug_slot);
254         int retval;
255
256         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
257                  __func__, slot_name(slot));
258
259         retval = slot->hpc_ops->get_latch_status(slot, value);
260         if (retval < 0)
261                 *value = hotplug_slot->info->latch_status;
262
263         return 0;
264 }
265
266 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
267 {
268         struct slot *slot = get_slot(hotplug_slot);
269         int retval;
270
271         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
272                  __func__, slot_name(slot));
273
274         retval = slot->hpc_ops->get_adapter_status(slot, value);
275         if (retval < 0)
276                 *value = hotplug_slot->info->adapter_status;
277
278         return 0;
279 }
280
281 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
282                                 enum pci_bus_speed *value)
283 {
284         struct slot *slot = get_slot(hotplug_slot);
285         int retval;
286
287         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
288                  __func__, slot_name(slot));
289
290         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
291         if (retval < 0)
292                 *value = PCI_SPEED_UNKNOWN;
293
294         return 0;
295 }
296
297 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
298 {
299         struct slot *slot = get_slot(hotplug_slot);
300         int retval;
301
302         ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
303                  __func__, slot_name(slot));
304
305         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
306         if (retval < 0)
307                 *value = PCI_SPEED_UNKNOWN;
308
309         return 0;
310 }
311
312 static int is_shpc_capable(struct pci_dev *dev)
313 {
314         if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
315                                                 PCI_DEVICE_ID_AMD_GOLAM_7450))
316                 return 1;
317         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
318                 return 0;
319         if (get_hp_hw_control_from_firmware(dev))
320                 return 0;
321         return 1;
322 }
323
324 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
325 {
326         int rc;
327         struct controller *ctrl;
328
329         if (!is_shpc_capable(pdev))
330                 return -ENODEV;
331
332         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
333         if (!ctrl) {
334                 dev_err(&pdev->dev, "%s : out of memory\n", __func__);
335                 goto err_out_none;
336         }
337         INIT_LIST_HEAD(&ctrl->slot_list);
338
339         rc = shpc_init(ctrl, pdev);
340         if (rc) {
341                 ctrl_dbg(ctrl, "controller initialization failed\n");
342                 goto err_out_free_ctrl;
343         }
344
345         pci_set_drvdata(pdev, ctrl);
346
347         /* Setup the slot information structures */
348         rc = init_slots(ctrl);
349         if (rc) {
350                 ctrl_err(ctrl, "slot initialization failed\n");
351                 goto err_out_release_ctlr;
352         }
353
354         rc = shpchp_create_ctrl_files(ctrl);
355         if (rc)
356                 goto err_cleanup_slots;
357
358         return 0;
359
360 err_cleanup_slots:
361         cleanup_slots(ctrl);
362 err_out_release_ctlr:
363         ctrl->hpc_ops->release_ctlr(ctrl);
364 err_out_free_ctrl:
365         kfree(ctrl);
366 err_out_none:
367         return -ENODEV;
368 }
369
370 static void shpc_remove(struct pci_dev *dev)
371 {
372         struct controller *ctrl = pci_get_drvdata(dev);
373
374         shpchp_remove_ctrl_files(ctrl);
375         ctrl->hpc_ops->release_ctlr(ctrl);
376         kfree(ctrl);
377 }
378
379 static struct pci_device_id shpcd_pci_tbl[] = {
380         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
381         { /* end: all zeroes */ }
382 };
383 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
384
385 static struct pci_driver shpc_driver = {
386         .name =         SHPC_MODULE_NAME,
387         .id_table =     shpcd_pci_tbl,
388         .probe =        shpc_probe,
389         .remove =       shpc_remove,
390 };
391
392 static int __init shpcd_init(void)
393 {
394         int retval = 0;
395
396         retval = pci_register_driver(&shpc_driver);
397         dbg("%s: pci_register_driver = %d\n", __func__, retval);
398         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
399         return retval;
400 }
401
402 static void __exit shpcd_cleanup(void)
403 {
404         dbg("unload_shpchpd()\n");
405         pci_unregister_driver(&shpc_driver);
406         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
407 }
408
409 module_init(shpcd_init);
410 module_exit(shpcd_cleanup);