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[PATCH] shpchp: adapt to pci driver model
[mv-sheeva.git] / 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 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_address          (struct hotplug_slot *slot, u32 *value);
69 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
70 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
71
72 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
73         .owner =                THIS_MODULE,
74         .set_attention_status = set_attention_status,
75         .enable_slot =          enable_slot,
76         .disable_slot =         disable_slot,
77         .get_power_status =     get_power_status,
78         .get_attention_status = get_attention_status,
79         .get_latch_status =     get_latch_status,
80         .get_adapter_status =   get_adapter_status,
81         .get_address =          get_address,
82         .get_max_bus_speed =    get_max_bus_speed,
83         .get_cur_bus_speed =    get_cur_bus_speed,
84 };
85
86 /**
87  * release_slot - free up the memory used by a slot
88  * @hotplug_slot: slot to free
89  */
90 static void release_slot(struct hotplug_slot *hotplug_slot)
91 {
92         struct slot *slot = hotplug_slot->private;
93
94         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
95
96         kfree(slot->hotplug_slot->info);
97         kfree(slot->hotplug_slot);
98         kfree(slot);
99 }
100
101 static void make_slot_name(struct slot *slot)
102 {
103         snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
104                  slot->bus, slot->number);
105 }
106
107 static int init_slots(struct controller *ctrl)
108 {
109         struct slot *slot;
110         struct hotplug_slot *hotplug_slot;
111         struct hotplug_slot_info *info;
112         int retval = -ENOMEM;
113         int i;
114         u32 sun;
115
116         for (i = 0; i < ctrl->num_slots; i++) {
117                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
118                 if (!slot)
119                         goto error;
120
121                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
122                 if (!hotplug_slot)
123                         goto error_slot;
124                 slot->hotplug_slot = hotplug_slot;
125
126                 info = kzalloc(sizeof(*info), GFP_KERNEL);
127                 if (!info)
128                         goto error_hpslot;
129                 hotplug_slot->info = info;
130
131                 hotplug_slot->name = slot->name;
132
133                 slot->hp_slot = i;
134                 slot->ctrl = ctrl;
135                 slot->bus = ctrl->slot_bus;
136                 slot->device = ctrl->slot_device_offset + i;
137                 slot->hpc_ops = ctrl->hpc_ops;
138                 mutex_init(&slot->lock);
139
140                 if (shpchprm_get_physical_slot_number(ctrl, &sun,
141                                                       slot->bus, slot->device))
142                         goto error_info;
143
144                 slot->number = sun;
145                 INIT_WORK(&slot->work, queue_pushbutton_work, slot);
146
147                 /* register this slot with the hotplug pci core */
148                 hotplug_slot->private = slot;
149                 hotplug_slot->release = &release_slot;
150                 make_slot_name(slot);
151                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
152
153                 get_power_status(hotplug_slot, &info->power_status);
154                 get_attention_status(hotplug_slot, &info->attention_status);
155                 get_latch_status(hotplug_slot, &info->latch_status);
156                 get_adapter_status(hotplug_slot, &info->adapter_status);
157
158                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
159                     "slot_device_offset=%x\n", slot->bus, slot->device,
160                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
161                 retval = pci_hp_register(slot->hotplug_slot);
162                 if (retval) {
163                         err("pci_hp_register failed with error %d\n", retval);
164                         goto error_info;
165                 }
166
167                 list_add(&slot->slot_list, &ctrl->slot_list);
168         }
169
170         return 0;
171 error_info:
172         kfree(info);
173 error_hpslot:
174         kfree(hotplug_slot);
175 error_slot:
176         kfree(slot);
177 error:
178         return retval;
179 }
180
181 void cleanup_slots(struct controller *ctrl)
182 {
183         struct list_head *tmp;
184         struct list_head *next;
185         struct slot *slot;
186
187         list_for_each_safe(tmp, next, &ctrl->slot_list) {
188                 slot = list_entry(tmp, struct slot, slot_list);
189                 list_del(&slot->slot_list);
190                 cancel_delayed_work(&slot->work);
191                 flush_scheduled_work();
192                 flush_workqueue(shpchp_wq);
193                 pci_hp_deregister(slot->hotplug_slot);
194         }
195 }
196
197 static int get_ctlr_slot_config(struct controller *ctrl)
198 {
199         int num_ctlr_slots;
200         int first_device_num;
201         int physical_slot_num;
202         int updown;
203         int rc;
204         int flags;
205
206         rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots,
207                                        &first_device_num, &physical_slot_num,
208                                        &updown, &flags);
209         if (rc) {
210                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n",
211                     __FUNCTION__, ctrl->bus, ctrl->device);
212                 return -1;
213         }
214
215         ctrl->num_slots = num_ctlr_slots;
216         ctrl->slot_device_offset = first_device_num;
217         ctrl->first_slot = physical_slot_num;
218         ctrl->slot_num_inc = updown;            /* either -1 or 1 */
219
220         dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d "
221             "(%x:%x)\n", __FUNCTION__, num_ctlr_slots, first_device_num,
222             physical_slot_num, updown, ctrl->bus, ctrl->device);
223
224         return 0;
225 }
226
227 /*
228  * set_attention_status - Turns the Amber LED for a slot on, off or blink
229  */
230 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
231 {
232         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
233
234         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
235
236         hotplug_slot->info->attention_status = status;
237         slot->hpc_ops->set_attention_status(slot, status);
238
239         return 0;
240 }
241
242 static int enable_slot (struct hotplug_slot *hotplug_slot)
243 {
244         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
245
246         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
247
248         return shpchp_sysfs_enable_slot(slot);
249 }
250
251 static int disable_slot (struct hotplug_slot *hotplug_slot)
252 {
253         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
254
255         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
256
257         return shpchp_sysfs_disable_slot(slot);
258 }
259
260 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
261 {
262         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
263         int retval;
264
265         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
266
267         retval = slot->hpc_ops->get_power_status(slot, value);
268         if (retval < 0)
269                 *value = hotplug_slot->info->power_status;
270
271         return 0;
272 }
273
274 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
275 {
276         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
277         int retval;
278
279         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
280
281         retval = slot->hpc_ops->get_attention_status(slot, value);
282         if (retval < 0)
283                 *value = hotplug_slot->info->attention_status;
284
285         return 0;
286 }
287
288 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
289 {
290         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
291         int retval;
292
293         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
294
295         retval = slot->hpc_ops->get_latch_status(slot, value);
296         if (retval < 0)
297                 *value = hotplug_slot->info->latch_status;
298
299         return 0;
300 }
301
302 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
303 {
304         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
305         int retval;
306
307         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
308
309         retval = slot->hpc_ops->get_adapter_status(slot, value);
310         if (retval < 0)
311                 *value = hotplug_slot->info->adapter_status;
312
313         return 0;
314 }
315
316 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value)
317 {
318         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
319         struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
320
321         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
322
323         *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
324
325         return 0;
326 }
327
328 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
329 {
330         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
331         int retval;
332
333         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
334
335         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
336         if (retval < 0)
337                 *value = PCI_SPEED_UNKNOWN;
338
339         return 0;
340 }
341
342 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
343 {
344         struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
345         int retval;
346
347         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
348
349         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
350         if (retval < 0)
351                 *value = PCI_SPEED_UNKNOWN;
352
353         return 0;
354 }
355
356 static int is_shpc_capable(struct pci_dev *dev)
357 {
358        if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
359                                PCI_DEVICE_ID_AMD_GOLAM_7450))
360                return 1;
361        if (pci_find_capability(dev, PCI_CAP_ID_SHPC))
362                return 1;
363
364        return 0;
365 }
366
367 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
368 {
369         int rc;
370         struct controller *ctrl;
371         struct slot *t_slot;
372         int first_device_num;   /* first PCI device number */
373         int num_ctlr_slots;     /* number of slots implemented */
374
375         if (!is_shpc_capable(pdev))
376                 return -ENODEV;
377
378         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
379         if (!ctrl) {
380                 err("%s : out of memory\n", __FUNCTION__);
381                 goto err_out_none;
382         }
383         INIT_LIST_HEAD(&ctrl->slot_list);
384
385         rc = shpc_init(ctrl, pdev);
386         if (rc) {
387                 dbg("%s: controller initialization failed\n",
388                     SHPC_MODULE_NAME);
389                 goto err_out_free_ctrl;
390         }
391
392         pci_set_drvdata(pdev, ctrl);
393
394         ctrl->bus = pdev->bus->number;
395         ctrl->slot_bus = pdev->subordinate->number;
396         ctrl->device = PCI_SLOT(pdev->devfn);
397         ctrl->function = PCI_FUNC(pdev->devfn);
398
399         dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
400             ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
401
402         /*
403          * Save configuration headers for this and subordinate PCI buses
404          */
405         rc = get_ctlr_slot_config(ctrl);
406         if (rc) {
407                 err(msg_initialization_err, rc);
408                 goto err_out_release_ctlr;
409         }
410         first_device_num = ctrl->slot_device_offset;
411         num_ctlr_slots = ctrl->num_slots;
412
413         ctrl->add_support = 1;
414
415         /* Setup the slot information structures */
416         rc = init_slots(ctrl);
417         if (rc) {
418                 err(msg_initialization_err, 6);
419                 goto err_out_release_ctlr;
420         }
421
422         /* Now hpc_functions (slot->hpc_ops->functions) are ready  */
423         t_slot = shpchp_find_slot(ctrl, first_device_num);
424
425         /* Check for operation bus speed */
426         rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
427         dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
428
429         if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
430                 err(SHPC_MODULE_NAME ": Can't get current bus speed. "
431                     "Set to 33MHz PCI.\n");
432                 ctrl->speed = PCI_SPEED_33MHz;
433         }
434
435         shpchp_create_ctrl_files(ctrl);
436
437         return 0;
438
439 err_out_release_ctlr:
440         ctrl->hpc_ops->release_ctlr(ctrl);
441 err_out_free_ctrl:
442         kfree(ctrl);
443 err_out_none:
444         return -ENODEV;
445 }
446
447 static void shpc_remove(struct pci_dev *dev)
448 {
449         struct controller *ctrl = pci_get_drvdata(dev);
450
451         shpchp_remove_ctrl_files(ctrl);
452         ctrl->hpc_ops->release_ctlr(ctrl);
453         kfree(ctrl);
454 }
455
456 static struct pci_device_id shpcd_pci_tbl[] = {
457         {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
458         { /* end: all zeroes */ }
459 };
460 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
461
462 static struct pci_driver shpc_driver = {
463         .name =         SHPC_MODULE_NAME,
464         .id_table =     shpcd_pci_tbl,
465         .probe =        shpc_probe,
466         .remove =       shpc_remove,
467 };
468
469 static int __init shpcd_init(void)
470 {
471         int retval = 0;
472
473 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
474         shpchp_poll_mode = 1;
475 #endif
476
477         shpchp_wq = create_singlethread_workqueue("shpchpd");
478         if (!shpchp_wq)
479                 return -ENOMEM;
480
481         retval = pci_register_driver(&shpc_driver);
482         dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
483         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
484         if (retval) {
485                 destroy_workqueue(shpchp_wq);
486         }
487         return retval;
488 }
489
490 static void __exit shpcd_cleanup(void)
491 {
492         dbg("unload_shpchpd()\n");
493         pci_unregister_driver(&shpc_driver);
494         destroy_workqueue(shpchp_wq);
495         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
496 }
497
498 module_init(shpcd_init);
499 module_exit(shpcd_cleanup);