Merge HEAD from master.kernel.org:/home/rmk/linux-2.6-serial.git
[linux-2.6] / 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 #include "shpchprm.h"
43
44 /* Global variables */
45 int shpchp_debug;
46 int shpchp_poll_mode;
47 int shpchp_poll_time;
48 struct controller *shpchp_ctrl_list;    /* = NULL */
49 struct pci_func *shpchp_slot_list[256];
50
51 #define DRIVER_VERSION  "0.4"
52 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
53 #define DRIVER_DESC     "Standard Hot Plug PCI Controller Driver"
54
55 MODULE_AUTHOR(DRIVER_AUTHOR);
56 MODULE_DESCRIPTION(DRIVER_DESC);
57 MODULE_LICENSE("GPL");
58
59 module_param(shpchp_debug, bool, 0644);
60 module_param(shpchp_poll_mode, bool, 0644);
61 module_param(shpchp_poll_time, int, 0644);
62 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
63 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
64 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
65
66 #define SHPC_MODULE_NAME "shpchp"
67
68 static int shpc_start_thread (void);
69 static int set_attention_status (struct hotplug_slot *slot, u8 value);
70 static int enable_slot          (struct hotplug_slot *slot);
71 static int disable_slot         (struct hotplug_slot *slot);
72 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
73 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
74 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
75 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
76 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
77 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
78
79 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
80         .owner =                THIS_MODULE,
81         .set_attention_status = set_attention_status,
82         .enable_slot =          enable_slot,
83         .disable_slot =         disable_slot,
84         .get_power_status =     get_power_status,
85         .get_attention_status = get_attention_status,
86         .get_latch_status =     get_latch_status,
87         .get_adapter_status =   get_adapter_status,
88         .get_max_bus_speed =    get_max_bus_speed,
89         .get_cur_bus_speed =    get_cur_bus_speed,
90 };
91
92 /**
93  * release_slot - free up the memory used by a slot
94  * @hotplug_slot: slot to free
95  */
96 static void release_slot(struct hotplug_slot *hotplug_slot)
97 {
98         struct slot *slot = hotplug_slot->private;
99
100         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
101
102         kfree(slot->hotplug_slot->info);
103         kfree(slot->hotplug_slot->name);
104         kfree(slot->hotplug_slot);
105         kfree(slot);
106 }
107
108 static int init_slots(struct controller *ctrl)
109 {
110         struct slot *new_slot;
111         u8 number_of_slots;
112         u8 slot_device;
113         u32 slot_number, sun;
114         int result = -ENOMEM;
115
116         dbg("%s\n",__FUNCTION__);
117
118         number_of_slots = ctrl->num_slots;
119         slot_device = ctrl->slot_device_offset;
120         slot_number = ctrl->first_slot;
121
122         while (number_of_slots) {
123                 new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL);
124                 if (!new_slot)
125                         goto error;
126
127                 memset(new_slot, 0, sizeof(struct slot));
128                 new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
129                 if (!new_slot->hotplug_slot)
130                         goto error_slot;
131                 memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
132
133                 new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
134                 if (!new_slot->hotplug_slot->info)
135                         goto error_hpslot;
136                 memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
137                 new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL);
138                 if (!new_slot->hotplug_slot->name)
139                         goto error_info;
140
141                 new_slot->magic = SLOT_MAGIC;
142                 new_slot->ctrl = ctrl;
143                 new_slot->bus = ctrl->slot_bus;
144                 new_slot->device = slot_device;
145                 new_slot->hpc_ops = ctrl->hpc_ops;
146
147                 if (shpchprm_get_physical_slot_number(ctrl, &sun,
148                                         new_slot->bus, new_slot->device))
149                         goto error_name;
150
151                 new_slot->number = sun;
152                 new_slot->hp_slot = slot_device - ctrl->slot_device_offset;
153
154                 /* register this slot with the hotplug pci core */
155                 new_slot->hotplug_slot->private = new_slot;
156                 new_slot->hotplug_slot->release = &release_slot;
157                 make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
158                 new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops;
159
160                 new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
161                 new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
162                 new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
163                 new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));
164
165                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus, 
166                         new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
167                 result = pci_hp_register (new_slot->hotplug_slot);
168                 if (result) {
169                         err ("pci_hp_register failed with error %d\n", result);
170                         goto error_name;
171                 }
172
173                 new_slot->next = ctrl->slot;
174                 ctrl->slot = new_slot;
175
176                 number_of_slots--;
177                 slot_device++;
178                 slot_number += ctrl->slot_num_inc;
179         }
180
181         return 0;
182
183 error_name:
184         kfree(new_slot->hotplug_slot->name);
185 error_info:
186         kfree(new_slot->hotplug_slot->info);
187 error_hpslot:
188         kfree(new_slot->hotplug_slot);
189 error_slot:
190         kfree(new_slot);
191 error:
192         return result;
193 }
194
195 static void cleanup_slots(struct controller *ctrl)
196 {
197         struct slot *old_slot, *next_slot;
198
199         old_slot = ctrl->slot;
200         ctrl->slot = NULL;
201
202         while (old_slot) {
203                 next_slot = old_slot->next;
204                 pci_hp_deregister(old_slot->hotplug_slot);
205                 old_slot = next_slot;
206         }
207 }
208
209 static int get_ctlr_slot_config(struct controller *ctrl)
210 {
211         int num_ctlr_slots;
212         int first_device_num;
213         int physical_slot_num;
214         int updown;
215         int rc;
216         int flags;
217
218         rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags);
219         if (rc) {
220                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
221                 return -1;
222         }
223
224         ctrl->num_slots = num_ctlr_slots;
225         ctrl->slot_device_offset = first_device_num;
226         ctrl->first_slot = physical_slot_num;
227         ctrl->slot_num_inc = updown;            /* either -1 or 1 */
228
229         dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n",
230                 __FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device);
231
232         return 0;
233 }
234
235
236 /*
237  * set_attention_status - Turns the Amber LED for a slot on, off or blink
238  */
239 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
240 {
241         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
242
243         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
244
245         hotplug_slot->info->attention_status = status;
246         slot->hpc_ops->set_attention_status(slot, status);
247
248         return 0;
249 }
250
251
252 static int enable_slot (struct hotplug_slot *hotplug_slot)
253 {
254         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
255
256         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
257
258         return shpchp_enable_slot(slot);
259 }
260
261
262 static int disable_slot (struct hotplug_slot *hotplug_slot)
263 {
264         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
265
266         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
267
268         return shpchp_disable_slot(slot);
269 }
270
271 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
272 {
273         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
274         int retval;
275
276         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
277
278         retval = slot->hpc_ops->get_power_status(slot, value);
279         if (retval < 0)
280                 *value = hotplug_slot->info->power_status;
281
282         return 0;
283 }
284
285 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
286 {
287         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
288         int retval;
289
290         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
291
292         retval = slot->hpc_ops->get_attention_status(slot, value);
293         if (retval < 0)
294                 *value = hotplug_slot->info->attention_status;
295
296         return 0;
297 }
298
299 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
300 {
301         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
302         int retval;
303
304         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
305
306         retval = slot->hpc_ops->get_latch_status(slot, value);
307         if (retval < 0)
308                 *value = hotplug_slot->info->latch_status;
309
310         return 0;
311 }
312
313 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
314 {
315         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
316         int retval;
317
318         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
319
320         retval = slot->hpc_ops->get_adapter_status(slot, value);
321         if (retval < 0)
322                 *value = hotplug_slot->info->adapter_status;
323
324         return 0;
325 }
326
327 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
328 {
329         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
330         int retval;
331
332         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
333         
334         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
335         if (retval < 0)
336                 *value = PCI_SPEED_UNKNOWN;
337
338         return 0;
339 }
340
341 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
342 {
343         struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
344         int retval;
345
346         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
347         
348         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
349         if (retval < 0)
350                 *value = PCI_SPEED_UNKNOWN;
351
352         return 0;
353 }
354
355 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
356 {
357         int rc;
358         struct controller *ctrl;
359         struct slot *t_slot;
360         int first_device_num;   /* first PCI device number supported by this SHPC */
361         int num_ctlr_slots;     /* number of slots supported by this SHPC */
362
363         ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL);
364         if (!ctrl) {
365                 err("%s : out of memory\n", __FUNCTION__);
366                 goto err_out_none;
367         }
368         memset(ctrl, 0, sizeof(struct controller));
369
370         dbg("DRV_thread pid = %d\n", current->pid);
371
372         rc = shpc_init(ctrl, pdev,
373                         (php_intr_callback_t) shpchp_handle_attention_button,
374                         (php_intr_callback_t) shpchp_handle_switch_change,
375                         (php_intr_callback_t) shpchp_handle_presence_change,
376                         (php_intr_callback_t) shpchp_handle_power_fault);
377         if (rc) {
378                 dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME);
379                 goto err_out_free_ctrl;
380         }
381
382         dbg("%s: controller initialization success\n", __FUNCTION__);
383         ctrl->pci_dev = pdev;  /* pci_dev of the P2P bridge */
384
385         pci_set_drvdata(pdev, ctrl);
386
387         ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL);
388         if (!ctrl->pci_bus) {
389                 err("out of memory\n");
390                 rc = -ENOMEM;
391                 goto err_out_unmap_mmio_region;
392         }
393         
394         memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
395         ctrl->bus = pdev->bus->number;
396         ctrl->slot_bus = pdev->subordinate->number;
397
398         ctrl->device = PCI_SLOT(pdev->devfn);
399         ctrl->function = PCI_FUNC(pdev->devfn);
400         dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
401
402         /*
403          *      Save configuration headers for this and subordinate PCI buses
404          */
405
406         rc = get_ctlr_slot_config(ctrl);
407         if (rc) {
408                 err(msg_initialization_err, rc);
409                 goto err_out_free_ctrl_bus;
410         }
411         first_device_num = ctrl->slot_device_offset;
412         num_ctlr_slots = ctrl->num_slots;
413
414         /* Store PCI Config Space for all devices on this bus */
415         rc = shpchp_save_config(ctrl, ctrl->slot_bus, num_ctlr_slots, first_device_num);
416         if (rc) {
417                 err("%s: unable to save PCI configuration data, error %d\n", __FUNCTION__, rc);
418                 goto err_out_free_ctrl_bus;
419         }
420
421         /* Get IO, memory, and IRQ resources for new devices */
422         rc = shpchprm_find_available_resources(ctrl);
423         ctrl->add_support = !rc;
424         
425         if (rc) {
426                 dbg("shpchprm_find_available_resources = %#x\n", rc);
427                 err("unable to locate PCI configuration resources for hot plug add.\n");
428                 goto err_out_free_ctrl_bus;
429         }
430
431         /* Setup the slot information structures */
432         rc = init_slots(ctrl);
433         if (rc) {
434                 err(msg_initialization_err, 6);
435                 goto err_out_free_ctrl_slot;
436         }
437
438         /* Now hpc_functions (slot->hpc_ops->functions) are ready  */
439         t_slot = shpchp_find_slot(ctrl, first_device_num);
440
441         /* Check for operation bus speed */
442         rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
443         dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
444
445         if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
446                 err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n");
447                 ctrl->speed = PCI_SPEED_33MHz;
448         }
449
450         /* Finish setting up the hot plug ctrl device */
451         ctrl->next_event = 0;
452
453         if (!shpchp_ctrl_list) {
454                 shpchp_ctrl_list = ctrl;
455                 ctrl->next = NULL;
456         } else {
457                 ctrl->next = shpchp_ctrl_list;
458                 shpchp_ctrl_list = ctrl;
459         }
460
461         shpchp_create_ctrl_files(ctrl);
462
463         return 0;
464
465 err_out_free_ctrl_slot:
466         cleanup_slots(ctrl);
467 err_out_free_ctrl_bus:
468         kfree(ctrl->pci_bus);
469 err_out_unmap_mmio_region:
470         ctrl->hpc_ops->release_ctlr(ctrl);
471 err_out_free_ctrl:
472         kfree(ctrl);
473 err_out_none:
474         return -ENODEV;
475 }
476
477
478 static int shpc_start_thread(void)
479 {
480         int loop;
481         int retval = 0;
482         
483         dbg("Initialize + Start the notification/polling mechanism \n");
484
485         retval = shpchp_event_start_thread();
486         if (retval) {
487                 dbg("shpchp_event_start_thread() failed\n");
488                 return retval;
489         }
490
491         dbg("Initialize slot lists\n");
492         /* One slot list for each bus in the system */
493         for (loop = 0; loop < 256; loop++) {
494                 shpchp_slot_list[loop] = NULL;
495         }
496
497         return retval;
498 }
499
500 static inline void __exit
501 free_shpchp_res(struct pci_resource *res)
502 {
503         struct pci_resource *tres;
504
505         while (res) {
506                 tres = res;
507                 res = res->next;
508                 kfree(tres);
509         }
510 }
511
512 static void __exit unload_shpchpd(void)
513 {
514         struct pci_func *next;
515         struct pci_func *TempSlot;
516         int loop;
517         struct controller *ctrl;
518         struct controller *tctrl;
519
520         ctrl = shpchp_ctrl_list;
521
522         while (ctrl) {
523                 cleanup_slots(ctrl);
524
525                 free_shpchp_res(ctrl->io_head);
526                 free_shpchp_res(ctrl->mem_head);
527                 free_shpchp_res(ctrl->p_mem_head);
528                 free_shpchp_res(ctrl->bus_head);
529
530                 kfree (ctrl->pci_bus);
531
532                 dbg("%s: calling release_ctlr\n", __FUNCTION__);
533                 ctrl->hpc_ops->release_ctlr(ctrl);
534
535                 tctrl = ctrl;
536                 ctrl = ctrl->next;
537
538                 kfree(tctrl);
539         }
540
541         for (loop = 0; loop < 256; loop++) {
542                 next = shpchp_slot_list[loop];
543                 while (next != NULL) {
544                         free_shpchp_res(next->io_head);
545                         free_shpchp_res(next->mem_head);
546                         free_shpchp_res(next->p_mem_head);
547                         free_shpchp_res(next->bus_head);
548
549                         TempSlot = next;
550                         next = next->next;
551                         kfree(TempSlot);
552                 }
553         }
554
555         /* Stop the notification mechanism */
556         shpchp_event_stop_thread();
557
558 }
559
560
561 static struct pci_device_id shpcd_pci_tbl[] = {
562         {
563         .class =        ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00),
564         .class_mask =   ~0,
565         .vendor =       PCI_ANY_ID,
566         .device =       PCI_ANY_ID,
567         .subvendor =    PCI_ANY_ID,
568         .subdevice =    PCI_ANY_ID,
569         },
570         
571         { /* end: all zeroes */ }
572 };
573
574 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
575
576
577
578 static struct pci_driver shpc_driver = {
579         .name =         SHPC_MODULE_NAME,
580         .id_table =     shpcd_pci_tbl,
581         .probe =        shpc_probe,
582         /* remove:      shpc_remove_one, */
583 };
584
585
586
587 static int __init shpcd_init(void)
588 {
589         int retval = 0;
590
591 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
592         shpchp_poll_mode = 1;
593 #endif
594
595         retval = shpc_start_thread();
596         if (retval)
597                 goto error_hpc_init;
598
599         retval = shpchprm_init(PCI);
600         if (!retval) {
601                 retval = pci_register_driver(&shpc_driver);
602                 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
603                 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
604         }
605
606 error_hpc_init:
607         if (retval) {
608                 shpchprm_cleanup();
609                 shpchp_event_stop_thread();
610         } else
611                 shpchprm_print_pirt();
612
613         return retval;
614 }
615
616 static void __exit shpcd_cleanup(void)
617 {
618         dbg("unload_shpchpd()\n");
619         unload_shpchpd();
620
621         shpchprm_cleanup();
622
623         dbg("pci_unregister_driver\n");
624         pci_unregister_driver(&shpc_driver);
625
626         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
627 }
628
629 module_init(shpcd_init);
630 module_exit(shpcd_cleanup);