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Linux/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 
 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"
 46 
 47 MODULE_AUTHOR(DRIVER_AUTHOR);
 48 MODULE_DESCRIPTION(DRIVER_DESC);
 49 MODULE_LICENSE("GPL");
 50 
 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");
 57 
 58 #define SHPC_MODULE_NAME "shpchp"
 59 
 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);
 67 
 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,
 76 };
 77 
 78 /**
 79  * release_slot - free up the memory used by a slot
 80  * @hotplug_slot: slot to free
 81  */
 82 static void release_slot(struct hotplug_slot *hotplug_slot)
 83 {
 84         struct slot *slot = hotplug_slot->private;
 85 
 86         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 87                  __func__, slot_name(slot));
 88 
 89         kfree(slot->hotplug_slot->info);
 90         kfree(slot->hotplug_slot);
 91         kfree(slot);
 92 }
 93 
 94 static int init_slots(struct controller *ctrl)
 95 {
 96         struct slot *slot;
 97         struct hotplug_slot *hotplug_slot;
 98         struct hotplug_slot_info *info;
 99         char name[SLOT_NAME_SIZE];
100         int retval;
101         int i;
102 
103         for (i = 0; i < ctrl->num_slots; i++) {
104                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
105                 if (!slot) {
106                         retval = -ENOMEM;
107                         goto error;
108                 }
109 
110                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
111                 if (!hotplug_slot) {
112                         retval = -ENOMEM;
113                         goto error_slot;
114                 }
115                 slot->hotplug_slot = hotplug_slot;
116 
117                 info = kzalloc(sizeof(*info), GFP_KERNEL);
118                 if (!info) {
119                         retval = -ENOMEM;
120                         goto error_hpslot;
121                 }
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 
131                 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
132                 if (!slot->wq) {
133                         retval = -ENOMEM;
134                         goto error_info;
135                 }
136 
137                 mutex_init(&slot->lock);
138                 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
139 
140                 /* register this slot with the hotplug pci core */
141                 hotplug_slot->private = slot;
142                 hotplug_slot->release = &release_slot;
143                 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
144                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
145 
146                 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n",
147                          pci_domain_nr(ctrl->pci_dev->subordinate),
148                          slot->bus, slot->device, slot->hp_slot, slot->number,
149                          ctrl->slot_device_offset);
150                 retval = pci_hp_register(slot->hotplug_slot,
151                                 ctrl->pci_dev->subordinate, slot->device, name);
152                 if (retval) {
153                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
154                                  retval);
155                         goto error_slotwq;
156                 }
157 
158                 get_power_status(hotplug_slot, &info->power_status);
159                 get_attention_status(hotplug_slot, &info->attention_status);
160                 get_latch_status(hotplug_slot, &info->latch_status);
161                 get_adapter_status(hotplug_slot, &info->adapter_status);
162 
163                 list_add(&slot->slot_list, &ctrl->slot_list);
164         }
165 
166         return 0;
167 error_slotwq:
168         destroy_workqueue(slot->wq);
169 error_info:
170         kfree(info);
171 error_hpslot:
172         kfree(hotplug_slot);
173 error_slot:
174         kfree(slot);
175 error:
176         return retval;
177 }
178 
179 void cleanup_slots(struct controller *ctrl)
180 {
181         struct list_head *tmp;
182         struct list_head *next;
183         struct slot *slot;
184 
185         list_for_each_safe(tmp, next, &ctrl->slot_list) {
186                 slot = list_entry(tmp, struct slot, slot_list);
187                 list_del(&slot->slot_list);
188                 cancel_delayed_work(&slot->work);
189                 destroy_workqueue(slot->wq);
190                 pci_hp_deregister(slot->hotplug_slot);
191         }
192 }
193 
194 /*
195  * set_attention_status - Turns the Amber LED for a slot on, off or blink
196  */
197 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
198 {
199         struct slot *slot = get_slot(hotplug_slot);
200 
201         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
202                  __func__, slot_name(slot));
203 
204         hotplug_slot->info->attention_status = status;
205         slot->hpc_ops->set_attention_status(slot, status);
206 
207         return 0;
208 }
209 
210 static int enable_slot (struct hotplug_slot *hotplug_slot)
211 {
212         struct slot *slot = get_slot(hotplug_slot);
213 
214         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
215                  __func__, slot_name(slot));
216 
217         return shpchp_sysfs_enable_slot(slot);
218 }
219 
220 static int disable_slot (struct hotplug_slot *hotplug_slot)
221 {
222         struct slot *slot = get_slot(hotplug_slot);
223 
224         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
225                  __func__, slot_name(slot));
226 
227         return shpchp_sysfs_disable_slot(slot);
228 }
229 
230 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
231 {
232         struct slot *slot = get_slot(hotplug_slot);
233         int retval;
234 
235         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
236                  __func__, slot_name(slot));
237 
238         retval = slot->hpc_ops->get_power_status(slot, value);
239         if (retval < 0)
240                 *value = hotplug_slot->info->power_status;
241 
242         return 0;
243 }
244 
245 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
246 {
247         struct slot *slot = get_slot(hotplug_slot);
248         int retval;
249 
250         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
251                  __func__, slot_name(slot));
252 
253         retval = slot->hpc_ops->get_attention_status(slot, value);
254         if (retval < 0)
255                 *value = hotplug_slot->info->attention_status;
256 
257         return 0;
258 }
259 
260 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
261 {
262         struct slot *slot = get_slot(hotplug_slot);
263         int retval;
264 
265         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
266                  __func__, slot_name(slot));
267 
268         retval = slot->hpc_ops->get_latch_status(slot, value);
269         if (retval < 0)
270                 *value = hotplug_slot->info->latch_status;
271 
272         return 0;
273 }
274 
275 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
276 {
277         struct slot *slot = get_slot(hotplug_slot);
278         int retval;
279 
280         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
281                  __func__, slot_name(slot));
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 is_shpc_capable(struct pci_dev *dev)
291 {
292         if (dev->vendor == PCI_VENDOR_ID_AMD &&
293             dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
294                 return 1;
295         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
296                 return 0;
297         if (get_hp_hw_control_from_firmware(dev))
298                 return 0;
299         return 1;
300 }
301 
302 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
303 {
304         int rc;
305         struct controller *ctrl;
306 
307         if (!is_shpc_capable(pdev))
308                 return -ENODEV;
309 
310         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
311         if (!ctrl) {
312                 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
313                 goto err_out_none;
314         }
315         INIT_LIST_HEAD(&ctrl->slot_list);
316 
317         rc = shpc_init(ctrl, pdev);
318         if (rc) {
319                 ctrl_dbg(ctrl, "Controller initialization failed\n");
320                 goto err_out_free_ctrl;
321         }
322 
323         pci_set_drvdata(pdev, ctrl);
324 
325         /* Setup the slot information structures */
326         rc = init_slots(ctrl);
327         if (rc) {
328                 ctrl_err(ctrl, "Slot initialization failed\n");
329                 goto err_out_release_ctlr;
330         }
331 
332         rc = shpchp_create_ctrl_files(ctrl);
333         if (rc)
334                 goto err_cleanup_slots;
335 
336         return 0;
337 
338 err_cleanup_slots:
339         cleanup_slots(ctrl);
340 err_out_release_ctlr:
341         ctrl->hpc_ops->release_ctlr(ctrl);
342 err_out_free_ctrl:
343         kfree(ctrl);
344 err_out_none:
345         return -ENODEV;
346 }
347 
348 static void shpc_remove(struct pci_dev *dev)
349 {
350         struct controller *ctrl = pci_get_drvdata(dev);
351 
352         shpchp_remove_ctrl_files(ctrl);
353         ctrl->hpc_ops->release_ctlr(ctrl);
354         kfree(ctrl);
355 }
356 
357 static struct pci_device_id shpcd_pci_tbl[] = {
358         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
359         { /* end: all zeroes */ }
360 };
361 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
362 
363 static struct pci_driver shpc_driver = {
364         .name =         SHPC_MODULE_NAME,
365         .id_table =     shpcd_pci_tbl,
366         .probe =        shpc_probe,
367         .remove =       shpc_remove,
368 };
369 
370 static int __init shpcd_init(void)
371 {
372         int retval;
373 
374         retval = pci_register_driver(&shpc_driver);
375         dbg("%s: pci_register_driver = %d\n", __func__, retval);
376         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
377 
378         return retval;
379 }
380 
381 static void __exit shpcd_cleanup(void)
382 {
383         dbg("unload_shpchpd()\n");
384         pci_unregister_driver(&shpc_driver);
385         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
386 }
387 
388 module_init(shpcd_init);
389 module_exit(shpcd_cleanup);
390 

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