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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 slot *slot, *next;
182 
183         list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) {
184                 list_del(&slot->slot_list);
185                 cancel_delayed_work(&slot->work);
186                 destroy_workqueue(slot->wq);
187                 pci_hp_deregister(slot->hotplug_slot);
188         }
189 }
190 
191 /*
192  * set_attention_status - Turns the Amber LED for a slot on, off or blink
193  */
194 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
195 {
196         struct slot *slot = get_slot(hotplug_slot);
197 
198         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
199                  __func__, slot_name(slot));
200 
201         hotplug_slot->info->attention_status = status;
202         slot->hpc_ops->set_attention_status(slot, status);
203 
204         return 0;
205 }
206 
207 static int enable_slot(struct hotplug_slot *hotplug_slot)
208 {
209         struct slot *slot = get_slot(hotplug_slot);
210 
211         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
212                  __func__, slot_name(slot));
213 
214         return shpchp_sysfs_enable_slot(slot);
215 }
216 
217 static int disable_slot(struct hotplug_slot *hotplug_slot)
218 {
219         struct slot *slot = get_slot(hotplug_slot);
220 
221         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
222                  __func__, slot_name(slot));
223 
224         return shpchp_sysfs_disable_slot(slot);
225 }
226 
227 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
228 {
229         struct slot *slot = get_slot(hotplug_slot);
230         int retval;
231 
232         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
233                  __func__, slot_name(slot));
234 
235         retval = slot->hpc_ops->get_power_status(slot, value);
236         if (retval < 0)
237                 *value = hotplug_slot->info->power_status;
238 
239         return 0;
240 }
241 
242 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
243 {
244         struct slot *slot = get_slot(hotplug_slot);
245         int retval;
246 
247         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
248                  __func__, slot_name(slot));
249 
250         retval = slot->hpc_ops->get_attention_status(slot, value);
251         if (retval < 0)
252                 *value = hotplug_slot->info->attention_status;
253 
254         return 0;
255 }
256 
257 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
258 {
259         struct slot *slot = get_slot(hotplug_slot);
260         int retval;
261 
262         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
263                  __func__, slot_name(slot));
264 
265         retval = slot->hpc_ops->get_latch_status(slot, value);
266         if (retval < 0)
267                 *value = hotplug_slot->info->latch_status;
268 
269         return 0;
270 }
271 
272 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
273 {
274         struct slot *slot = get_slot(hotplug_slot);
275         int retval;
276 
277         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
278                  __func__, slot_name(slot));
279 
280         retval = slot->hpc_ops->get_adapter_status(slot, value);
281         if (retval < 0)
282                 *value = hotplug_slot->info->adapter_status;
283 
284         return 0;
285 }
286 
287 static int is_shpc_capable(struct pci_dev *dev)
288 {
289         if (dev->vendor == PCI_VENDOR_ID_AMD &&
290             dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
291                 return 1;
292         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
293                 return 0;
294         if (get_hp_hw_control_from_firmware(dev))
295                 return 0;
296         return 1;
297 }
298 
299 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
300 {
301         int rc;
302         struct controller *ctrl;
303 
304         if (!is_shpc_capable(pdev))
305                 return -ENODEV;
306 
307         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
308         if (!ctrl) {
309                 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
310                 goto err_out_none;
311         }
312         INIT_LIST_HEAD(&ctrl->slot_list);
313 
314         rc = shpc_init(ctrl, pdev);
315         if (rc) {
316                 ctrl_dbg(ctrl, "Controller initialization failed\n");
317                 goto err_out_free_ctrl;
318         }
319 
320         pci_set_drvdata(pdev, ctrl);
321 
322         /* Setup the slot information structures */
323         rc = init_slots(ctrl);
324         if (rc) {
325                 ctrl_err(ctrl, "Slot initialization failed\n");
326                 goto err_out_release_ctlr;
327         }
328 
329         rc = shpchp_create_ctrl_files(ctrl);
330         if (rc)
331                 goto err_cleanup_slots;
332 
333         return 0;
334 
335 err_cleanup_slots:
336         cleanup_slots(ctrl);
337 err_out_release_ctlr:
338         ctrl->hpc_ops->release_ctlr(ctrl);
339 err_out_free_ctrl:
340         kfree(ctrl);
341 err_out_none:
342         return -ENODEV;
343 }
344 
345 static void shpc_remove(struct pci_dev *dev)
346 {
347         struct controller *ctrl = pci_get_drvdata(dev);
348 
349         shpchp_remove_ctrl_files(ctrl);
350         ctrl->hpc_ops->release_ctlr(ctrl);
351         kfree(ctrl);
352 }
353 
354 static struct pci_device_id shpcd_pci_tbl[] = {
355         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
356         { /* end: all zeroes */ }
357 };
358 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
359 
360 static struct pci_driver shpc_driver = {
361         .name =         SHPC_MODULE_NAME,
362         .id_table =     shpcd_pci_tbl,
363         .probe =        shpc_probe,
364         .remove =       shpc_remove,
365 };
366 
367 static int __init shpcd_init(void)
368 {
369         int retval;
370 
371         retval = pci_register_driver(&shpc_driver);
372         dbg("%s: pci_register_driver = %d\n", __func__, retval);
373         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
374 
375         return retval;
376 }
377 
378 static void __exit shpcd_cleanup(void)
379 {
380         dbg("unload_shpchpd()\n");
381         pci_unregister_driver(&shpc_driver);
382         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
383 }
384 
385 module_init(shpcd_init);
386 module_exit(shpcd_cleanup);
387 

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