1 /*
2 * PCI Express 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 "pciehp.h"
36 #include <linux/interrupt.h>
37 #include <linux/time.h>
38
39 /* Global variables */
40 int pciehp_debug;
41 int pciehp_poll_mode;
42 int pciehp_poll_time;
43 int pciehp_force;
44 struct workqueue_struct *pciehp_wq;
45
46 #define DRIVER_VERSION "0.4"
47 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
48 #define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
49
50 MODULE_AUTHOR(DRIVER_AUTHOR);
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
53
54 module_param(pciehp_debug, bool, 0644);
55 module_param(pciehp_poll_mode, bool, 0644);
56 module_param(pciehp_poll_time, int, 0644);
57 module_param(pciehp_force, bool, 0644);
58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
62
63 #define PCIE_MODULE_NAME "pciehp"
64
65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
66 static int enable_slot (struct hotplug_slot *slot);
67 static int disable_slot (struct hotplug_slot *slot);
68 static int get_power_status (struct hotplug_slot *slot, u8 *value);
69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
70 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
71 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
72 static int get_address (struct hotplug_slot *slot, u32 *value);
73 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
74 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
75
76 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
77 .owner = THIS_MODULE,
78 .set_attention_status = set_attention_status,
79 .enable_slot = enable_slot,
80 .disable_slot = disable_slot,
81 .get_power_status = get_power_status,
82 .get_attention_status = get_attention_status,
83 .get_latch_status = get_latch_status,
84 .get_adapter_status = get_adapter_status,
85 .get_address = get_address,
86 .get_max_bus_speed = get_max_bus_speed,
87 .get_cur_bus_speed = get_cur_bus_speed,
88 };
89
90 /*
91 * Check the status of the Electro Mechanical Interlock (EMI)
92 */
93 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
94 {
95 struct slot *slot = hotplug_slot->private;
96 return (slot->hpc_ops->get_emi_status(slot, value));
97 }
98
99 /*
100 * sysfs interface for the Electro Mechanical Interlock (EMI)
101 * 1 == locked, 0 == unlocked
102 */
103 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
104 {
105 int retval;
106 u8 value;
107
108 retval = get_lock_status(slot, &value);
109 if (retval)
110 goto lock_read_exit;
111 retval = sprintf (buf, "%d\n", value);
112
113 lock_read_exit:
114 return retval;
115 }
116
117 /*
118 * Change the status of the Electro Mechanical Interlock (EMI)
119 * This is a toggle - in addition there must be at least 1 second
120 * in between toggles.
121 */
122 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
123 {
124 struct slot *slot = hotplug_slot->private;
125 int retval;
126 u8 value;
127
128 mutex_lock(&slot->ctrl->crit_sect);
129
130 /* has it been >1 sec since our last toggle? */
131 if ((get_seconds() - slot->last_emi_toggle) < 1)
132 return -EINVAL;
133
134 /* see what our current state is */
135 retval = get_lock_status(hotplug_slot, &value);
136 if (retval || (value == status))
137 goto set_lock_exit;
138
139 slot->hpc_ops->toggle_emi(slot);
140 set_lock_exit:
141 mutex_unlock(&slot->ctrl->crit_sect);
142 return 0;
143 }
144
145 /*
146 * sysfs interface which allows the user to toggle the Electro Mechanical
147 * Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
148 */
149 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
150 size_t count)
151 {
152 unsigned long llock;
153 u8 lock;
154 int retval = 0;
155
156 llock = simple_strtoul(buf, NULL, 10);
157 lock = (u8)(llock & 0xff);
158
159 switch (lock) {
160 case 0:
161 case 1:
162 retval = set_lock_status(slot, lock);
163 break;
164 default:
165 err ("%d is an invalid lock value\n", lock);
166 retval = -EINVAL;
167 }
168 if (retval)
169 return retval;
170 return count;
171 }
172
173 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
174 .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
175 .show = lock_read_file,
176 .store = lock_write_file
177 };
178
179 /**
180 * release_slot - free up the memory used by a slot
181 * @hotplug_slot: slot to free
182 */
183 static void release_slot(struct hotplug_slot *hotplug_slot)
184 {
185 struct slot *slot = hotplug_slot->private;
186
187 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
188
189 kfree(slot->hotplug_slot->info);
190 kfree(slot->hotplug_slot);
191 kfree(slot);
192 }
193
194 static void make_slot_name(struct slot *slot)
195 {
196 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
197 slot->bus, slot->number);
198 }
199
200 static int init_slots(struct controller *ctrl)
201 {
202 struct slot *slot;
203 struct hotplug_slot *hotplug_slot;
204 struct hotplug_slot_info *info;
205 int retval = -ENOMEM;
206 int i;
207
208 for (i = 0; i < ctrl->num_slots; i++) {
209 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
210 if (!slot)
211 goto error;
212
213 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
214 if (!hotplug_slot)
215 goto error_slot;
216 slot->hotplug_slot = hotplug_slot;
217
218 info = kzalloc(sizeof(*info), GFP_KERNEL);
219 if (!info)
220 goto error_hpslot;
221 hotplug_slot->info = info;
222
223 hotplug_slot->name = slot->name;
224
225 slot->hp_slot = i;
226 slot->ctrl = ctrl;
227 slot->bus = ctrl->pci_dev->subordinate->number;
228 slot->device = ctrl->slot_device_offset + i;
229 slot->hpc_ops = ctrl->hpc_ops;
230 slot->number = ctrl->first_slot;
231 mutex_init(&slot->lock);
232 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
233
234 /* register this slot with the hotplug pci core */
235 hotplug_slot->private = slot;
236 hotplug_slot->release = &release_slot;
237 make_slot_name(slot);
238 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
239
240 get_power_status(hotplug_slot, &info->power_status);
241 get_attention_status(hotplug_slot, &info->attention_status);
242 get_latch_status(hotplug_slot, &info->latch_status);
243 get_adapter_status(hotplug_slot, &info->adapter_status);
244
245 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
246 "slot_device_offset=%x\n", slot->bus, slot->device,
247 slot->hp_slot, slot->number, ctrl->slot_device_offset);
248 retval = pci_hp_register(hotplug_slot);
249 if (retval) {
250 err ("pci_hp_register failed with error %d\n", retval);
251 goto error_info;
252 }
253 /* create additional sysfs entries */
254 if (EMI(ctrl->ctrlcap)) {
255 retval = sysfs_create_file(&hotplug_slot->kobj,
256 &hotplug_slot_attr_lock.attr);
257 if (retval) {
258 pci_hp_deregister(hotplug_slot);
259 err("cannot create additional sysfs entries\n");
260 goto error_info;
261 }
262 }
263
264 list_add(&slot->slot_list, &ctrl->slot_list);
265 }
266
267 return 0;
268 error_info:
269 kfree(info);
270 error_hpslot:
271 kfree(hotplug_slot);
272 error_slot:
273 kfree(slot);
274 error:
275 return retval;
276 }
277
278 static void cleanup_slots(struct controller *ctrl)
279 {
280 struct list_head *tmp;
281 struct list_head *next;
282 struct slot *slot;
283
284 list_for_each_safe(tmp, next, &ctrl->slot_list) {
285 slot = list_entry(tmp, struct slot, slot_list);
286 list_del(&slot->slot_list);
287 if (EMI(ctrl->ctrlcap))
288 sysfs_remove_file(&slot->hotplug_slot->kobj,
289 &hotplug_slot_attr_lock.attr);
290 cancel_delayed_work(&slot->work);
291 flush_scheduled_work();
292 flush_workqueue(pciehp_wq);
293 pci_hp_deregister(slot->hotplug_slot);
294 }
295 }
296
297 /*
298 * set_attention_status - Turns the Amber LED for a slot on, off or blink
299 */
300 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
301 {
302 struct slot *slot = hotplug_slot->private;
303
304 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
305
306 hotplug_slot->info->attention_status = status;
307
308 if (ATTN_LED(slot->ctrl->ctrlcap))
309 slot->hpc_ops->set_attention_status(slot, status);
310
311 return 0;
312 }
313
314
315 static int enable_slot(struct hotplug_slot *hotplug_slot)
316 {
317 struct slot *slot = hotplug_slot->private;
318
319 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
320
321 return pciehp_sysfs_enable_slot(slot);
322 }
323
324
325 static int disable_slot(struct hotplug_slot *hotplug_slot)
326 {
327 struct slot *slot = hotplug_slot->private;
328
329 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
330
331 return pciehp_sysfs_disable_slot(slot);
332 }
333
334 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
335 {
336 struct slot *slot = hotplug_slot->private;
337 int retval;
338
339 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
340
341 retval = slot->hpc_ops->get_power_status(slot, value);
342 if (retval < 0)
343 *value = hotplug_slot->info->power_status;
344
345 return 0;
346 }
347
348 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
349 {
350 struct slot *slot = hotplug_slot->private;
351 int retval;
352
353 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
354
355 retval = slot->hpc_ops->get_attention_status(slot, value);
356 if (retval < 0)
357 *value = hotplug_slot->info->attention_status;
358
359 return 0;
360 }
361
362 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
363 {
364 struct slot *slot = hotplug_slot->private;
365 int retval;
366
367 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
368
369 retval = slot->hpc_ops->get_latch_status(slot, value);
370 if (retval < 0)
371 *value = hotplug_slot->info->latch_status;
372
373 return 0;
374 }
375
376 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
377 {
378 struct slot *slot = hotplug_slot->private;
379 int retval;
380
381 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
382
383 retval = slot->hpc_ops->get_adapter_status(slot, value);
384 if (retval < 0)
385 *value = hotplug_slot->info->adapter_status;
386
387 return 0;
388 }
389
390 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
391 {
392 struct slot *slot = hotplug_slot->private;
393 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
394
395 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
396
397 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
398
399 return 0;
400 }
401
402 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
403 {
404 struct slot *slot = hotplug_slot->private;
405 int retval;
406
407 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
408
409 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
410 if (retval < 0)
411 *value = PCI_SPEED_UNKNOWN;
412
413 return 0;
414 }
415
416 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
417 {
418 struct slot *slot = hotplug_slot->private;
419 int retval;
420
421 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
422
423 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
424 if (retval < 0)
425 *value = PCI_SPEED_UNKNOWN;
426
427 return 0;
428 }
429
430 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
431 {
432 int rc;
433 struct controller *ctrl;
434 struct slot *t_slot;
435 u8 value;
436 struct pci_dev *pdev;
437
438 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
439 if (!ctrl) {
440 err("%s : out of memory\n", __FUNCTION__);
441 goto err_out_none;
442 }
443 INIT_LIST_HEAD(&ctrl->slot_list);
444
445 pdev = dev->port;
446 ctrl->pci_dev = pdev;
447
448 rc = pcie_init(ctrl, dev);
449 if (rc) {
450 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
451 goto err_out_free_ctrl;
452 }
453
454 pci_set_drvdata(pdev, ctrl);
455
456 dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
457 __FUNCTION__, pdev->bus->number, PCI_SLOT(pdev->devfn),
458 PCI_FUNC(pdev->devfn), pdev->irq);
459
460 /* Setup the slot information structures */
461 rc = init_slots(ctrl);
462 if (rc) {
463 err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
464 goto err_out_release_ctlr;
465 }
466
467 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
468
469 t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
470 if (value && pciehp_force) {
471 rc = pciehp_enable_slot(t_slot);
472 if (rc) /* -ENODEV: shouldn't happen, but deal with it */
473 value = 0;
474 }
475 if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
476 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
477 if (rc)
478 goto err_out_free_ctrl_slot;
479 }
480
481 return 0;
482
483 err_out_free_ctrl_slot:
484 cleanup_slots(ctrl);
485 err_out_release_ctlr:
486 ctrl->hpc_ops->release_ctlr(ctrl);
487 err_out_free_ctrl:
488 kfree(ctrl);
489 err_out_none:
490 return -ENODEV;
491 }
492
493 static void pciehp_remove (struct pcie_device *dev)
494 {
495 struct pci_dev *pdev = dev->port;
496 struct controller *ctrl = pci_get_drvdata(pdev);
497
498 cleanup_slots(ctrl);
499 ctrl->hpc_ops->release_ctlr(ctrl);
500 kfree(ctrl);
501 }
502
503 #ifdef CONFIG_PM
504 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
505 {
506 printk("%s ENTRY\n", __FUNCTION__);
507 return 0;
508 }
509
510 static int pciehp_resume (struct pcie_device *dev)
511 {
512 printk("%s ENTRY\n", __FUNCTION__);
513 if (pciehp_force) {
514 struct pci_dev *pdev = dev->port;
515 struct controller *ctrl = pci_get_drvdata(pdev);
516 struct slot *t_slot;
517 u8 status;
518
519 /* reinitialize the chipset's event detection logic */
520 pcie_init_hardware_part2(ctrl, dev);
521
522 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
523
524 /* Check if slot is occupied */
525 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
526 if (status)
527 pciehp_enable_slot(t_slot);
528 else
529 pciehp_disable_slot(t_slot);
530 }
531 return 0;
532 }
533 #endif
534
535 static struct pcie_port_service_id port_pci_ids[] = { {
536 .vendor = PCI_ANY_ID,
537 .device = PCI_ANY_ID,
538 .port_type = PCIE_ANY_PORT,
539 .service_type = PCIE_PORT_SERVICE_HP,
540 .driver_data = 0,
541 }, { /* end: all zeroes */ }
542 };
543 static const char device_name[] = "hpdriver";
544
545 static struct pcie_port_service_driver hpdriver_portdrv = {
546 .name = (char *)device_name,
547 .id_table = &port_pci_ids[0],
548
549 .probe = pciehp_probe,
550 .remove = pciehp_remove,
551
552 #ifdef CONFIG_PM
553 .suspend = pciehp_suspend,
554 .resume = pciehp_resume,
555 #endif /* PM */
556 };
557
558 static int __init pcied_init(void)
559 {
560 int retval = 0;
561
562 retval = pcie_port_service_register(&hpdriver_portdrv);
563 dbg("pcie_port_service_register = %d\n", retval);
564 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
565 if (retval)
566 dbg("%s: Failure to register service\n", __FUNCTION__);
567 return retval;
568 }
569
570 static void __exit pcied_cleanup(void)
571 {
572 dbg("unload_pciehpd()\n");
573 pcie_port_service_unregister(&hpdriver_portdrv);
574 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
575 }
576
577 module_init(pcied_init);
578 module_exit(pcied_cleanup);
579
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