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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 "
147                          "hp_slot=%x sun=%x slot_device_offset=%x\n",
148                          pci_domain_nr(ctrl->pci_dev->subordinate),
149                          slot->bus, slot->device, slot->hp_slot, slot->number,
150                          ctrl->slot_device_offset);
151                 retval = pci_hp_register(slot->hotplug_slot,
152                                 ctrl->pci_dev->subordinate, slot->device, name);
153                 if (retval) {
154                         ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
155                                  retval);
156                         goto error_slotwq;
157                 }
158 
159                 get_power_status(hotplug_slot, &info->power_status);
160                 get_attention_status(hotplug_slot, &info->attention_status);
161                 get_latch_status(hotplug_slot, &info->latch_status);
162                 get_adapter_status(hotplug_slot, &info->adapter_status);
163 
164                 list_add(&slot->slot_list, &ctrl->slot_list);
165         }
166 
167         return 0;
168 error_slotwq:
169         destroy_workqueue(slot->wq);
170 error_info:
171         kfree(info);
172 error_hpslot:
173         kfree(hotplug_slot);
174 error_slot:
175         kfree(slot);
176 error:
177         return retval;
178 }
179 
180 void cleanup_slots(struct controller *ctrl)
181 {
182         struct list_head *tmp;
183         struct list_head *next;
184         struct slot *slot;
185 
186         list_for_each_safe(tmp, next, &ctrl->slot_list) {
187                 slot = list_entry(tmp, struct slot, slot_list);
188                 list_del(&slot->slot_list);
189                 cancel_delayed_work(&slot->work);
190                 destroy_workqueue(slot->wq);
191                 pci_hp_deregister(slot->hotplug_slot);
192         }
193 }
194 
195 /*
196  * set_attention_status - Turns the Amber LED for a slot on, off or blink
197  */
198 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
199 {
200         struct slot *slot = get_slot(hotplug_slot);
201 
202         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
203                  __func__, slot_name(slot));
204 
205         hotplug_slot->info->attention_status = status;
206         slot->hpc_ops->set_attention_status(slot, status);
207 
208         return 0;
209 }
210 
211 static int enable_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_enable_slot(slot);
219 }
220 
221 static int disable_slot (struct hotplug_slot *hotplug_slot)
222 {
223         struct slot *slot = get_slot(hotplug_slot);
224 
225         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
226                  __func__, slot_name(slot));
227 
228         return shpchp_sysfs_disable_slot(slot);
229 }
230 
231 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
232 {
233         struct slot *slot = get_slot(hotplug_slot);
234         int retval;
235 
236         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
237                  __func__, slot_name(slot));
238 
239         retval = slot->hpc_ops->get_power_status(slot, value);
240         if (retval < 0)
241                 *value = hotplug_slot->info->power_status;
242 
243         return 0;
244 }
245 
246 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
247 {
248         struct slot *slot = get_slot(hotplug_slot);
249         int retval;
250 
251         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
252                  __func__, slot_name(slot));
253 
254         retval = slot->hpc_ops->get_attention_status(slot, value);
255         if (retval < 0)
256                 *value = hotplug_slot->info->attention_status;
257 
258         return 0;
259 }
260 
261 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
262 {
263         struct slot *slot = get_slot(hotplug_slot);
264         int retval;
265 
266         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
267                  __func__, slot_name(slot));
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         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
282                  __func__, slot_name(slot));
283 
284         retval = slot->hpc_ops->get_adapter_status(slot, value);
285         if (retval < 0)
286                 *value = hotplug_slot->info->adapter_status;
287 
288         return 0;
289 }
290 
291 static int is_shpc_capable(struct pci_dev *dev)
292 {
293         if (dev->vendor == PCI_VENDOR_ID_AMD &&
294             dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
295                 return 1;
296         if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
297                 return 0;
298         if (get_hp_hw_control_from_firmware(dev))
299                 return 0;
300         return 1;
301 }
302 
303 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
304 {
305         int rc;
306         struct controller *ctrl;
307 
308         if (!is_shpc_capable(pdev))
309                 return -ENODEV;
310 
311         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
312         if (!ctrl) {
313                 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
314                 goto err_out_none;
315         }
316         INIT_LIST_HEAD(&ctrl->slot_list);
317 
318         rc = shpc_init(ctrl, pdev);
319         if (rc) {
320                 ctrl_dbg(ctrl, "Controller initialization failed\n");
321                 goto err_out_free_ctrl;
322         }
323 
324         pci_set_drvdata(pdev, ctrl);
325 
326         /* Setup the slot information structures */
327         rc = init_slots(ctrl);
328         if (rc) {
329                 ctrl_err(ctrl, "Slot initialization failed\n");
330                 goto err_out_release_ctlr;
331         }
332 
333         rc = shpchp_create_ctrl_files(ctrl);
334         if (rc)
335                 goto err_cleanup_slots;
336 
337         return 0;
338 
339 err_cleanup_slots:
340         cleanup_slots(ctrl);
341 err_out_release_ctlr:
342         ctrl->hpc_ops->release_ctlr(ctrl);
343 err_out_free_ctrl:
344         kfree(ctrl);
345 err_out_none:
346         return -ENODEV;
347 }
348 
349 static void shpc_remove(struct pci_dev *dev)
350 {
351         struct controller *ctrl = pci_get_drvdata(dev);
352 
353         shpchp_remove_ctrl_files(ctrl);
354         ctrl->hpc_ops->release_ctlr(ctrl);
355         kfree(ctrl);
356 }
357 
358 static struct pci_device_id shpcd_pci_tbl[] = {
359         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
360         { /* end: all zeroes */ }
361 };
362 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
363 
364 static struct pci_driver shpc_driver = {
365         .name =         SHPC_MODULE_NAME,
366         .id_table =     shpcd_pci_tbl,
367         .probe =        shpc_probe,
368         .remove =       shpc_remove,
369 };
370 
371 static int __init shpcd_init(void)
372 {
373         int retval;
374 
375         retval = pci_register_driver(&shpc_driver);
376         dbg("%s: pci_register_driver = %d\n", __func__, retval);
377         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
378 
379         return retval;
380 }
381 
382 static void __exit shpcd_cleanup(void)
383 {
384         dbg("unload_shpchpd()\n");
385         pci_unregister_driver(&shpc_driver);
386         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
387 }
388 
389 module_init(shpcd_init);
390 module_exit(shpcd_cleanup);
391 

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