aboutsummaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug/pciehp_core.c
blob: f93e81e2d2c7873d408eca03365d88474ec1451d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
/*
 * PCI Express Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 Intel Corporation
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include "pciehp.h"
#include <linux/interrupt.h>

/* Global variables */
int pciehp_debug;
int pciehp_poll_mode;
int pciehp_poll_time;
int pciehp_force;
struct controller *pciehp_ctrl_list;

#define DRIVER_VERSION	"0.4"
#define DRIVER_AUTHOR	"Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
#define DRIVER_DESC	"PCI Express Hot Plug Controller Driver"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(pciehp_debug, bool, 0644);
module_param(pciehp_poll_mode, bool, 0644);
module_param(pciehp_poll_time, int, 0644);
module_param(pciehp_force, bool, 0644);
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");

#define PCIE_MODULE_NAME "pciehp"

static int pcie_start_thread (void);
static int set_attention_status (struct hotplug_slot *slot, u8 value);
static int enable_slot		(struct hotplug_slot *slot);
static int disable_slot		(struct hotplug_slot *slot);
static int get_power_status	(struct hotplug_slot *slot, u8 *value);
static int get_attention_status	(struct hotplug_slot *slot, u8 *value);
static int get_latch_status	(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status	(struct hotplug_slot *slot, u8 *value);
static int get_address		(struct hotplug_slot *slot, u32 *value);
static int get_max_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);
static int get_cur_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);

static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
	.owner =		THIS_MODULE,
	.set_attention_status =	set_attention_status,
	.enable_slot =		enable_slot,
	.disable_slot =		disable_slot,
	.get_power_status =	get_power_status,
	.get_attention_status =	get_attention_status,
	.get_latch_status =	get_latch_status,
	.get_adapter_status =	get_adapter_status,
	.get_address =		get_address,
  	.get_max_bus_speed =	get_max_bus_speed,
  	.get_cur_bus_speed =	get_cur_bus_speed,
};

/**
 * release_slot - free up the memory used by a slot
 * @hotplug_slot: slot to free
 */
static void release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot->name);
	kfree(slot->hotplug_slot);
	kfree(slot);
}

static int init_slots(struct controller *ctrl)
{
	struct slot *slot;
	struct hpc_ops *hpc_ops;
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *hotplug_slot_info;
	u8 number_of_slots;
	u8 slot_device;
	u32 slot_number;
	int result = -ENOMEM;

	number_of_slots = ctrl->num_slots;
	slot_device = ctrl->slot_device_offset;
	slot_number = ctrl->first_slot;

	while (number_of_slots) {
		slot = kzalloc(sizeof(*slot), GFP_KERNEL);
		if (!slot)
			goto error;

		slot->hotplug_slot =
				kzalloc(sizeof(*(slot->hotplug_slot)),
						GFP_KERNEL);
		if (!slot->hotplug_slot)
			goto error_slot;
		hotplug_slot = slot->hotplug_slot;

		hotplug_slot->info =
			kzalloc(sizeof(*(hotplug_slot->info)),
						GFP_KERNEL);
		if (!hotplug_slot->info)
			goto error_hpslot;
		hotplug_slot_info = hotplug_slot->info;
		hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
		if (!hotplug_slot->name)
			goto error_info;

		slot->ctrl = ctrl;
		slot->bus = ctrl->slot_bus;
		slot->device = slot_device;
		slot->hpc_ops = hpc_ops = ctrl->hpc_ops;

		slot->number = ctrl->first_slot;
		slot->hp_slot = slot_device - ctrl->slot_device_offset;

		/* register this slot with the hotplug pci core */
		hotplug_slot->private = slot;
		hotplug_slot->release = &release_slot;
		make_slot_name(hotplug_slot->name, SLOT_NAME_SIZE, slot);
		hotplug_slot->ops = &pciehp_hotplug_slot_ops;

		hpc_ops->get_power_status(slot,
			&(hotplug_slot_info->power_status));
		hpc_ops->get_attention_status(slot,
			&(hotplug_slot_info->attention_status));
		hpc_ops->get_latch_status(slot,
			&(hotplug_slot_info->latch_status));
		hpc_ops->get_adapter_status(slot,
			&(hotplug_slot_info->adapter_status));

		dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
			"slot_device_offset=%x\n",
			slot->bus, slot->device, slot->hp_slot, slot->number,
			ctrl->slot_device_offset);
		result = pci_hp_register(hotplug_slot);
		if (result) {
			err ("pci_hp_register failed with error %d\n", result);
			goto error_name;
		}

		slot->next = ctrl->slot;
		ctrl->slot = slot;

		number_of_slots--;
		slot_device++;
		slot_number += ctrl->slot_num_inc;
	}

	return 0;

error_name:
	kfree(hotplug_slot->name);
error_info:
	kfree(hotplug_slot_info);
error_hpslot:
	kfree(hotplug_slot);
error_slot:
	kfree(slot);
error:
	return result;
}


static int cleanup_slots (struct controller * ctrl)
{
	struct slot *old_slot, *next_slot;

	old_slot = ctrl->slot;
	ctrl->slot = NULL;

	while (old_slot) {
		next_slot = old_slot->next;
		pci_hp_deregister (old_slot->hotplug_slot);
		old_slot = next_slot;
	}


	return(0);
}

static int get_ctlr_slot_config(struct controller *ctrl)
{
	int num_ctlr_slots;		/* Not needed; PCI Express has 1 slot per port*/
	int first_device_num;		/* Not needed */
	int physical_slot_num;
	u8 ctrlcap;			
	int rc;

	rc = pcie_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &ctrlcap);
	if (rc) {
		err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
		return (-1);
	}

	ctrl->num_slots = num_ctlr_slots;	/* PCI Express has 1 slot per port */
	ctrl->slot_device_offset = first_device_num;
	ctrl->first_slot = physical_slot_num;
	ctrl->ctrlcap = ctrlcap; 	

	dbg("%s: bus(0x%x) num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) ctrlcap(%x) for b:d (%x:%x)\n",
		__FUNCTION__, ctrl->slot_bus, num_ctlr_slots, first_device_num, physical_slot_num, ctrlcap, 
		ctrl->bus, ctrl->device);

	return (0);
}


/*
 * set_attention_status - Turns the Amber LED for a slot on, off or blink
 */
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	hotplug_slot->info->attention_status = status;
	
	if (ATTN_LED(slot->ctrl->ctrlcap)) 
		slot->hpc_ops->set_attention_status(slot, status);

	return 0;
}


static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	return pciehp_enable_slot(slot);
}


static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	return pciehp_disable_slot(slot);
}

static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_power_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->power_status;

	return 0;
}

static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_attention_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->attention_status;

	return 0;
}

static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_latch_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->latch_status;

	return 0;
}

static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_adapter_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->adapter_status;

	return 0;
}

static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
{
	struct slot *slot = hotplug_slot->private;
	struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	*value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;

	return 0;
}

static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	
	retval = slot->hpc_ops->get_max_bus_speed(slot, value);
	if (retval < 0)
		*value = PCI_SPEED_UNKNOWN;

	return 0;
}

static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	
	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
	if (retval < 0)
		*value = PCI_SPEED_UNKNOWN;

	return 0;
}

static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
{
	int rc;
	struct controller *ctrl;
	struct slot *t_slot;
	int first_device_num = 0 ;	/* first PCI device number supported by this PCIE */  
	int num_ctlr_slots;		/* number of slots supported by this HPC */
	u8 value;
	struct pci_dev *pdev;
	
	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl) {
		err("%s : out of memory\n", __FUNCTION__);
		goto err_out_none;
	}

	pdev = dev->port;
	ctrl->pci_dev = pdev;

	rc = pcie_init(ctrl, dev);
	if (rc) {
		dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
		goto err_out_free_ctrl;
	}

	pci_set_drvdata(pdev, ctrl);

	ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);
	if (!ctrl->pci_bus) {
		err("%s: out of memory\n", __FUNCTION__);
		rc = -ENOMEM;
		goto err_out_unmap_mmio_region;
	}
	memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
	ctrl->bus = pdev->bus->number;  /* ctrl bus */
	ctrl->slot_bus = pdev->subordinate->number;  /* bus controlled by this HPC */

	ctrl->device = PCI_SLOT(pdev->devfn);
	ctrl->function = PCI_FUNC(pdev->devfn);
	dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
		ctrl->bus, ctrl->device, ctrl->function, pdev->irq);

	/*
	 *	Save configuration headers for this and subordinate PCI buses
	 */

	rc = get_ctlr_slot_config(ctrl);
	if (rc) {
		err(msg_initialization_err, rc);
		goto err_out_free_ctrl_bus;
	}
	first_device_num = ctrl->slot_device_offset;
	num_ctlr_slots = ctrl->num_slots; 

	/* Setup the slot information structures */
	rc = init_slots(ctrl);
	if (rc) {
		err(msg_initialization_err, 6);
		goto err_out_free_ctrl_slot;
	}

	t_slot = pciehp_find_slot(ctrl, first_device_num);

	/*	Finish setting up the hot plug ctrl device */
	ctrl->next_event = 0;

	if (!pciehp_ctrl_list) {
		pciehp_ctrl_list = ctrl;
		ctrl->next = NULL;
	} else {
		ctrl->next = pciehp_ctrl_list;
		pciehp_ctrl_list = ctrl;
	}

	/* Wait for exclusive access to hardware */
	mutex_lock(&ctrl->ctrl_lock);

	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
	
	if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
		rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
		if (rc) {
			/* Done with exclusive hardware access */
			mutex_unlock(&ctrl->ctrl_lock);
			goto err_out_free_ctrl_slot;
		} else
			/* Wait for the command to complete */
			wait_for_ctrl_irq (ctrl);
	}

	/* Done with exclusive hardware access */
	mutex_unlock(&ctrl->ctrl_lock);

	return 0;

err_out_free_ctrl_slot:
	cleanup_slots(ctrl);
err_out_free_ctrl_bus:
	kfree(ctrl->pci_bus);
err_out_unmap_mmio_region:
	ctrl->hpc_ops->release_ctlr(ctrl);
err_out_free_ctrl:
	kfree(ctrl);
err_out_none:
	return -ENODEV;
}


static int pcie_start_thread(void)
{
	int retval = 0;
	
	dbg("Initialize + Start the notification/polling mechanism \n");

	retval = pciehp_event_start_thread();
	if (retval) {
		dbg("pciehp_event_start_thread() failed\n");
		return retval;
	}

	return retval;
}

static void __exit unload_pciehpd(void)
{
	struct controller *ctrl;
	struct controller *tctrl;

	ctrl = pciehp_ctrl_list;

	while (ctrl) {
		cleanup_slots(ctrl);

		kfree (ctrl->pci_bus);

		ctrl->hpc_ops->release_ctlr(ctrl);

		tctrl = ctrl;
		ctrl = ctrl->next;

		kfree(tctrl);
	}

	/* Stop the notification mechanism */
	pciehp_event_stop_thread();

}

static int hpdriver_context = 0;

static void pciehp_remove (struct pcie_device *device)
{
	printk("%s ENTRY\n", __FUNCTION__);	
	printk("%s -> Call free_irq for irq = %d\n",  
		__FUNCTION__, device->irq);
	free_irq(device->irq, &hpdriver_context);
}

#ifdef CONFIG_PM
static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
{
	printk("%s ENTRY\n", __FUNCTION__);	
	return 0;
}

static int pciehp_resume (struct pcie_device *dev)
{
	printk("%s ENTRY\n", __FUNCTION__);	
	return 0;
}
#endif

static struct pcie_port_service_id port_pci_ids[] = { { 
	.vendor = PCI_ANY_ID, 
	.device = PCI_ANY_ID,
	.port_type = PCIE_ANY_PORT,
	.service_type = PCIE_PORT_SERVICE_HP,
	.driver_data =	0, 
	}, { /* end: all zeroes */ }
};
static const char device_name[] = "hpdriver";

static struct pcie_port_service_driver hpdriver_portdrv = {
	.name		= (char *)device_name,
	.id_table	= &port_pci_ids[0],

	.probe		= pciehp_probe,
	.remove		= pciehp_remove,

#ifdef	CONFIG_PM
	.suspend	= pciehp_suspend,
	.resume		= pciehp_resume,
#endif	/* PM */
};

static int __init pcied_init(void)
{
	int retval = 0;

#ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
	pciehp_poll_mode = 1;
#endif

	retval = pcie_start_thread();
	if (retval)
		goto error_hpc_init;

	retval = pcie_port_service_register(&hpdriver_portdrv);
 	dbg("pcie_port_service_register = %d\n", retval);
  	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 	if (retval)
		dbg("%s: Failure to register service\n", __FUNCTION__);

error_hpc_init:
	if (retval) {
		pciehp_event_stop_thread();
	};

	return retval;
}

static void __exit pcied_cleanup(void)
{
	dbg("unload_pciehpd()\n");
	unload_pciehpd();

	pcie_port_service_unregister(&hpdriver_portdrv);

	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
}

module_init(pcied_init);
module_exit(pcied_cleanup);