[PATCH] shpchp: dont save PCI config for hotplug slots/devices
[firefly-linux-kernel-4.4.55.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/config.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/kernel.h>
34 #include <linux/types.h>
35 #include <linux/proc_fs.h>
36 #include <linux/slab.h>
37 #include <linux/workqueue.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <asm/uaccess.h>
41 #include "shpchp.h"
42
43 /* Global variables */
44 int shpchp_debug;
45 int shpchp_poll_mode;
46 int shpchp_poll_time;
47 struct controller *shpchp_ctrl_list;    /* = NULL */
48 struct pci_func *shpchp_slot_list[256];
49
50 #define DRIVER_VERSION  "0.4"
51 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
52 #define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
53
54 MODULE_AUTHOR(DRIVER_AUTHOR);
55 MODULE_DESCRIPTION(DRIVER_DESC);
56 MODULE_LICENSE("GPL");
57
58 module_param(shpchp_debug, bool, 0644);
59 module_param(shpchp_poll_mode, bool, 0644);
60 module_param(shpchp_poll_time, int, 0644);
61 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
62 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
63 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
64
65 #define SHPC_MODULE_NAME "shpchp"
66
67 static int shpc_start_thread (void);
68 static int set_attention_status (struct hotplug_slot *slot, u8 value);
69 static int enable_slot          (struct hotplug_slot *slot);
70 static int disable_slot         (struct hotplug_slot *slot);
71 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
72 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
73 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
74 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
75 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
76 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
77
78 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
79         .owner =                THIS_MODULE,
80         .set_attention_status = set_attention_status,
81         .enable_slot =          enable_slot,
82         .disable_slot =         disable_slot,
83         .get_power_status =     get_power_status,
84         .get_attention_status = get_attention_status,
85         .get_latch_status =     get_latch_status,
86         .get_adapter_status =   get_adapter_status,
87         .get_max_bus_speed =    get_max_bus_speed,
88         .get_cur_bus_speed =    get_cur_bus_speed,
89 };
90
91 /**
92  * release_slot - free up the memory used by a slot
93  * @hotplug_slot: slot to free
94  */
95 static void release_slot(struct hotplug_slot *hotplug_slot)
96 {
97         struct slot *slot = hotplug_slot->private;
98
99         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
100
101         kfree(slot->hotplug_slot->info);
102         kfree(slot->hotplug_slot->name);
103         kfree(slot->hotplug_slot);
104         kfree(slot);
105 }
106
107 static int init_slots(struct controller *ctrl)
108 {
109         struct slot *new_slot;
110         u8 number_of_slots;
111         u8 slot_device;
112         u32 slot_number, sun;
113         int result = -ENOMEM;
114
115         dbg("%s\n",__FUNCTION__);
116
117         number_of_slots = ctrl->num_slots;
118         slot_device = ctrl->slot_device_offset;
119         slot_number = ctrl->first_slot;
120
121         while (number_of_slots) {
122                 new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL);
123                 if (!new_slot)
124                         goto error;
125
126                 memset(new_slot, 0, sizeof(struct slot));
127                 new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
128                 if (!new_slot->hotplug_slot)
129                         goto error_slot;
130                 memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
131
132                 new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
133                 if (!new_slot->hotplug_slot->info)
134                         goto error_hpslot;
135                 memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
136                 new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL);
137                 if (!new_slot->hotplug_slot->name)
138                         goto error_info;
139
140                 new_slot->magic = SLOT_MAGIC;
141                 new_slot->ctrl = ctrl;
142                 new_slot->bus = ctrl->slot_bus;
143                 new_slot->device = slot_device;
144                 new_slot->hpc_ops = ctrl->hpc_ops;
145
146                 if (shpchprm_get_physical_slot_number(ctrl, &sun,
147                                         new_slot->bus, new_slot->device))
148                         goto error_name;
149
150                 new_slot->number = sun;
151                 new_slot->hp_slot = slot_device - ctrl->slot_device_offset;
152
153                 /* register this slot with the hotplug pci core */
154                 new_slot->hotplug_slot->private = new_slot;
155                 new_slot->hotplug_slot->release = &release_slot;
156                 make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
157                 new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops;
158
159                 new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
160                 new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
161                 new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
162                 new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));
163
164                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus, 
165                         new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
166                 result = pci_hp_register (new_slot->hotplug_slot);
167                 if (result) {
168                         err ("pci_hp_register failed with error %d\n", result);
169                         goto error_name;
170                 }
171
172                 new_slot->next = ctrl->slot;
173                 ctrl->slot = new_slot;
174
175                 number_of_slots--;
176                 slot_device++;
177                 slot_number += ctrl->slot_num_inc;
178         }
179
180         return 0;
181
182 error_name:
183         kfree(new_slot->hotplug_slot->name);
184 error_info:
185         kfree(new_slot->hotplug_slot->info);
186 error_hpslot:
187         kfree(new_slot->hotplug_slot);
188 error_slot:
189         kfree(new_slot);
190 error:
191         return result;
192 }
193
194 static void cleanup_slots(struct controller *ctrl)
195 {
196         struct slot *old_slot, *next_slot;
197
198         old_slot = ctrl->slot;
199         ctrl->slot = NULL;
200
201         while (old_slot) {
202                 next_slot = old_slot->next;
203                 pci_hp_deregister(old_slot->hotplug_slot);
204                 old_slot = next_slot;
205         }
206 }
207
208 static int get_ctlr_slot_config(struct controller *ctrl)
209 {
210         int num_ctlr_slots;
211         int first_device_num;
212         int physical_slot_num;
213         int updown;
214         int rc;
215         int flags;
216
217         rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags);
218         if (rc) {
219                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
220                 return -1;
221         }
222
223         ctrl->num_slots = num_ctlr_slots;
224         ctrl->slot_device_offset = first_device_num;
225         ctrl->first_slot = physical_slot_num;
226         ctrl->slot_num_inc = updown;            /* either -1 or 1 */
227
228         dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n",
229                 __FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device);
230
231         return 0;
232 }
233
234
235 /*
236  * set_attention_status - Turns the Amber LED for a slot on, off or blink
237  */
238 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
239 {
240         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
241
242         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
243
244         hotplug_slot->info->attention_status = status;
245         slot->hpc_ops->set_attention_status(slot, status);
246
247         return 0;
248 }
249
250
251 static int enable_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_enable_slot(slot);
258 }
259
260
261 static int disable_slot (struct hotplug_slot *hotplug_slot)
262 {
263         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
264
265         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
266
267         return shpchp_disable_slot(slot);
268 }
269
270 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
271 {
272         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
273         int retval;
274
275         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
276
277         retval = slot->hpc_ops->get_power_status(slot, value);
278         if (retval < 0)
279                 *value = hotplug_slot->info->power_status;
280
281         return 0;
282 }
283
284 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
285 {
286         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
287         int retval;
288
289         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
290
291         retval = slot->hpc_ops->get_attention_status(slot, value);
292         if (retval < 0)
293                 *value = hotplug_slot->info->attention_status;
294
295         return 0;
296 }
297
298 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
299 {
300         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
301         int retval;
302
303         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
304
305         retval = slot->hpc_ops->get_latch_status(slot, value);
306         if (retval < 0)
307                 *value = hotplug_slot->info->latch_status;
308
309         return 0;
310 }
311
312 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
313 {
314         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
315         int retval;
316
317         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
318
319         retval = slot->hpc_ops->get_adapter_status(slot, value);
320         if (retval < 0)
321                 *value = hotplug_slot->info->adapter_status;
322
323         return 0;
324 }
325
326 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
327 {
328         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
329         int retval;
330
331         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
332         
333         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
334         if (retval < 0)
335                 *value = PCI_SPEED_UNKNOWN;
336
337         return 0;
338 }
339
340 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
341 {
342         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
343         int retval;
344
345         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
346         
347         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
348         if (retval < 0)
349                 *value = PCI_SPEED_UNKNOWN;
350
351         return 0;
352 }
353
354 static int is_shpc_capable(struct pci_dev *dev)
355 {
356        if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
357                                PCI_DEVICE_ID_AMD_GOLAM_7450))
358                return 1;
359        if (pci_find_capability(dev, PCI_CAP_ID_SHPC))
360                return 1;
361
362        return 0;
363 }
364
365 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
366 {
367         int rc;
368         struct controller *ctrl;
369         struct slot *t_slot;
370         int first_device_num;   /* first PCI device number supported by this SHPC */
371         int num_ctlr_slots;     /* number of slots supported by this SHPC */
372
373         if (!is_shpc_capable(pdev))
374                 return -ENODEV;
375
376         ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL);
377         if (!ctrl) {
378                 err("%s : out of memory\n", __FUNCTION__);
379                 goto err_out_none;
380         }
381         memset(ctrl, 0, sizeof(struct controller));
382
383         dbg("DRV_thread pid = %d\n", current->pid);
384
385         rc = shpc_init(ctrl, pdev,
386                         (php_intr_callback_t) shpchp_handle_attention_button,
387                         (php_intr_callback_t) shpchp_handle_switch_change,
388                         (php_intr_callback_t) shpchp_handle_presence_change,
389                         (php_intr_callback_t) shpchp_handle_power_fault);
390         if (rc) {
391                 dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME);
392                 goto err_out_free_ctrl;
393         }
394
395         dbg("%s: controller initialization success\n", __FUNCTION__);
396         ctrl->pci_dev = pdev;  /* pci_dev of the P2P bridge */
397
398         pci_set_drvdata(pdev, ctrl);
399
400         ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL);
401         if (!ctrl->pci_bus) {
402                 err("out of memory\n");
403                 rc = -ENOMEM;
404                 goto err_out_unmap_mmio_region;
405         }
406         
407         memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
408         ctrl->bus = pdev->bus->number;
409         ctrl->slot_bus = pdev->subordinate->number;
410
411         ctrl->device = PCI_SLOT(pdev->devfn);
412         ctrl->function = PCI_FUNC(pdev->devfn);
413         dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
414
415         /*
416          *      Save configuration headers for this and subordinate PCI buses
417          */
418
419         rc = get_ctlr_slot_config(ctrl);
420         if (rc) {
421                 err(msg_initialization_err, rc);
422                 goto err_out_free_ctrl_bus;
423         }
424         first_device_num = ctrl->slot_device_offset;
425         num_ctlr_slots = ctrl->num_slots;
426
427         ctrl->add_support = 1;
428         
429         /* Setup the slot information structures */
430         rc = init_slots(ctrl);
431         if (rc) {
432                 err(msg_initialization_err, 6);
433                 goto err_out_free_ctrl_slot;
434         }
435
436         /* Now hpc_functions (slot->hpc_ops->functions) are ready  */
437         t_slot = shpchp_find_slot(ctrl, first_device_num);
438
439         /* Check for operation bus speed */
440         rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
441         dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
442
443         if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
444                 err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n");
445                 ctrl->speed = PCI_SPEED_33MHz;
446         }
447
448         /* Finish setting up the hot plug ctrl device */
449         ctrl->next_event = 0;
450
451         if (!shpchp_ctrl_list) {
452                 shpchp_ctrl_list = ctrl;
453                 ctrl->next = NULL;
454         } else {
455                 ctrl->next = shpchp_ctrl_list;
456                 shpchp_ctrl_list = ctrl;
457         }
458
459         shpchp_create_ctrl_files(ctrl);
460
461         return 0;
462
463 err_out_free_ctrl_slot:
464         cleanup_slots(ctrl);
465 err_out_free_ctrl_bus:
466         kfree(ctrl->pci_bus);
467 err_out_unmap_mmio_region:
468         ctrl->hpc_ops->release_ctlr(ctrl);
469 err_out_free_ctrl:
470         kfree(ctrl);
471 err_out_none:
472         return -ENODEV;
473 }
474
475
476 static int shpc_start_thread(void)
477 {
478         int loop;
479         int retval = 0;
480         
481         dbg("Initialize + Start the notification/polling mechanism \n");
482
483         retval = shpchp_event_start_thread();
484         if (retval) {
485                 dbg("shpchp_event_start_thread() failed\n");
486                 return retval;
487         }
488
489         dbg("Initialize slot lists\n");
490         /* One slot list for each bus in the system */
491         for (loop = 0; loop < 256; loop++) {
492                 shpchp_slot_list[loop] = NULL;
493         }
494
495         return retval;
496 }
497
498 static void __exit unload_shpchpd(void)
499 {
500         struct pci_func *next;
501         struct pci_func *TempSlot;
502         int loop;
503         struct controller *ctrl;
504         struct controller *tctrl;
505
506         ctrl = shpchp_ctrl_list;
507
508         while (ctrl) {
509                 cleanup_slots(ctrl);
510
511                 kfree (ctrl->pci_bus);
512
513                 dbg("%s: calling release_ctlr\n", __FUNCTION__);
514                 ctrl->hpc_ops->release_ctlr(ctrl);
515
516                 tctrl = ctrl;
517                 ctrl = ctrl->next;
518
519                 kfree(tctrl);
520         }
521
522         for (loop = 0; loop < 256; loop++) {
523                 next = shpchp_slot_list[loop];
524                 while (next != NULL) {
525                         TempSlot = next;
526                         next = next->next;
527                         kfree(TempSlot);
528                 }
529         }
530
531         /* Stop the notification mechanism */
532         shpchp_event_stop_thread();
533
534 }
535
536
537 static struct pci_device_id shpcd_pci_tbl[] = {
538         {
539         .class =        ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00),
540         .class_mask =   ~0,
541         .vendor =       PCI_ANY_ID,
542         .device =       PCI_ANY_ID,
543         .subvendor =    PCI_ANY_ID,
544         .subdevice =    PCI_ANY_ID,
545         },
546         
547         { /* end: all zeroes */ }
548 };
549
550 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
551
552
553
554 static struct pci_driver shpc_driver = {
555         .name =         SHPC_MODULE_NAME,
556         .id_table =     shpcd_pci_tbl,
557         .probe =        shpc_probe,
558         /* remove:      shpc_remove_one, */
559 };
560
561
562
563 static int __init shpcd_init(void)
564 {
565         int retval = 0;
566
567 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
568         shpchp_poll_mode = 1;
569 #endif
570
571         retval = shpc_start_thread();
572         if (retval)
573                 goto error_hpc_init;
574
575         retval = pci_register_driver(&shpc_driver);
576         dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
577         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
578
579 error_hpc_init:
580         if (retval) {
581                 shpchp_event_stop_thread();
582         }
583         return retval;
584 }
585
586 static void __exit shpcd_cleanup(void)
587 {
588         dbg("unload_shpchpd()\n");
589         unload_shpchpd();
590
591         dbg("pci_unregister_driver\n");
592         pci_unregister_driver(&shpc_driver);
593
594         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
595 }
596
597 module_init(shpcd_init);
598 module_exit(shpcd_cleanup);