summaryrefslogtreecommitdiffstats
path: root/drivers/pci/hotplug/shpchp_ctrl.c
blob: b8ab2796e66af83d42dc3f2112f7bd3ca6a651bf (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
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/*
 * Standard 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/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
#include "../pci.h"
#include "shpchp.h"

static void interrupt_event_handler(struct work_struct *work);
static int shpchp_enable_slot(struct slot *p_slot);
static int shpchp_disable_slot(struct slot *p_slot);

static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
{
	struct event_info *info;

	info = kmalloc(sizeof(*info), GFP_ATOMIC);
	if (!info)
		return -ENOMEM;

	info->event_type = event_type;
	info->p_slot = p_slot;
	INIT_WORK(&info->work, interrupt_event_handler);

	schedule_work(&info->work);

	return 0;
}

u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
{
	struct slot *p_slot;
	u32 event_type;

	/* Attention Button Change */
	ctrl_dbg(ctrl, "Attention button interrupt received\n");

	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));

	/*
	 *  Button pressed - See if need to TAKE ACTION!!!
	 */
	ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
	event_type = INT_BUTTON_PRESS;

	queue_interrupt_event(p_slot, event_type);

	return 0;

}

u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
{
	struct slot *p_slot;
	u8 getstatus;
	u32 event_type;

	/* Switch Change */
	ctrl_dbg(ctrl, "Switch interrupt received\n");

	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	ctrl_dbg(ctrl, "Card present %x Power status %x\n",
		 p_slot->presence_save, p_slot->pwr_save);

	if (getstatus) {
		/*
		 * Switch opened
		 */
		ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
		event_type = INT_SWITCH_OPEN;
		if (p_slot->pwr_save && p_slot->presence_save) {
			event_type = INT_POWER_FAULT;
			ctrl_err(ctrl, "Surprise Removal of card\n");
		}
	} else {
		/*
		 *  Switch closed
		 */
		ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
		event_type = INT_SWITCH_CLOSE;
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
}

u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
{
	struct slot *p_slot;
	u32 event_type;

	/* Presence Change */
	ctrl_dbg(ctrl, "Presence/Notify input change\n");

	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	/*
	 * Save the presence state
	 */
	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
	if (p_slot->presence_save) {
		/*
		 * Card Present
		 */
		ctrl_info(ctrl, "Card present on Slot(%s)\n",
			  slot_name(p_slot));
		event_type = INT_PRESENCE_ON;
	} else {
		/*
		 * Not Present
		 */
		ctrl_info(ctrl, "Card not present on Slot(%s)\n",
			  slot_name(p_slot));
		event_type = INT_PRESENCE_OFF;
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
}

u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
{
	struct slot *p_slot;
	u32 event_type;

	/* Power fault */
	ctrl_dbg(ctrl, "Power fault interrupt received\n");

	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
		/*
		 * Power fault Cleared
		 */
		ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
			  slot_name(p_slot));
		p_slot->status = 0x00;
		event_type = INT_POWER_FAULT_CLEAR;
	} else {
		/*
		 *   Power fault
		 */
		ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
		event_type = INT_POWER_FAULT;
		/* set power fault status for this board */
		p_slot->status = 0xFF;
		ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
}

/* The following routines constitute the bulk of the
   hotplug controller logic
 */
static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
		enum pci_bus_speed speed)
{
	int rc = 0;

	ctrl_dbg(ctrl, "Change speed to %d\n", speed);
	if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
		ctrl_err(ctrl, "%s: Issue of set bus speed mode command "
			 "failed\n", __func__);
		return WRONG_BUS_FREQUENCY;
	}
	return rc;
}

static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
		u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
		enum pci_bus_speed msp)
{
	int rc = 0;

	/*
	 * If other slots on the same bus are occupied, we cannot
	 * change the bus speed.
	 */
	if (flag) {
		if (asp < bsp) {
			ctrl_err(ctrl, "Speed of bus %x and adapter %x "
				 "mismatch\n", bsp, asp);
			rc = WRONG_BUS_FREQUENCY;
		}
		return rc;
	}

	if (asp < msp) {
		if (bsp != asp)
			rc = change_bus_speed(ctrl, pslot, asp);
	} else {
		if (bsp != msp)
			rc = change_bus_speed(ctrl, pslot, msp);
	}
	return rc;
}

/**
 * board_added - Called after a board has been added to the system.
 * @p_slot: target &slot
 *
 * Turns power on for the board.
 * Configures board.
 */
static int board_added(struct slot *p_slot)
{
	u8 hp_slot;
	u8 slots_not_empty = 0;
	int rc = 0;
	enum pci_bus_speed asp, bsp, msp;
	struct controller *ctrl = p_slot->ctrl;
	struct pci_bus *parent = ctrl->pci_dev->subordinate;

	hp_slot = p_slot->device - ctrl->slot_device_offset;

	ctrl_dbg(ctrl,
		 "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
		 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);

	/* Power on slot without connecting to bus */
	rc = p_slot->hpc_ops->power_on_slot(p_slot);
	if (rc) {
		ctrl_err(ctrl, "Failed to power on slot\n");
		return -1;
	}

	if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
		if (slots_not_empty)
			return WRONG_BUS_FREQUENCY;

		if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
			ctrl_err(ctrl, "%s: Issue of set bus speed mode command"
				 " failed\n", __func__);
			return WRONG_BUS_FREQUENCY;
		}

		/* turn on board, blink green LED, turn off Amber LED */
		if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
			ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
			return rc;
		}
	}

	rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
	if (rc) {
		ctrl_err(ctrl, "Can't get adapter speed or "
			 "bus mode mismatch\n");
		return WRONG_BUS_FREQUENCY;
	}

	rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bsp);
	if (rc) {
		ctrl_err(ctrl, "Can't get bus operation speed\n");
		return WRONG_BUS_FREQUENCY;
	}

	rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &msp);
	if (rc) {
		ctrl_err(ctrl, "Can't get max bus operation speed\n");
		msp = bsp;
	}

	/* Check if there are other slots or devices on the same bus */
	if (!list_empty(&ctrl->pci_dev->subordinate->devices))
		slots_not_empty = 1;

	ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d,"
		 " max_bus_speed %d\n", __func__, slots_not_empty, asp,
		 bsp, msp);

	rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
	if (rc)
		return rc;

	/* turn on board, blink green LED, turn off Amber LED */
	if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
		ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
		return rc;
	}

	/* Wait for ~1 second */
	msleep(1000);

	ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
	/* Check for a power fault */
	if (p_slot->status == 0xFF) {
		/* power fault occurred, but it was benign */
		ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
		rc = POWER_FAILURE;
		p_slot->status = 0;
		goto err_exit;
	}

	if (shpchp_configure_device(p_slot)) {
		ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
			 pci_domain_nr(parent), p_slot->bus, p_slot->device);
		goto err_exit;
	}

	p_slot->status = 0;
	p_slot->is_a_board = 0x01;
	p_slot->pwr_save = 1;

	p_slot->hpc_ops->green_led_on(p_slot);

	return 0;

err_exit:
	/* turn off slot, turn on Amber LED, turn off Green LED */
	rc = p_slot->hpc_ops->slot_disable(p_slot);
	if (rc) {
		ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
			 __func__);
		return rc;
	}

	return(rc);
}


/**
 * remove_board - Turns off slot and LEDs
 * @p_slot: target &slot
 */
static int remove_board(struct slot *p_slot)
{
	struct controller *ctrl = p_slot->ctrl;
	u8 hp_slot;
	int rc;

	if (shpchp_unconfigure_device(p_slot))
		return(1);

	hp_slot = p_slot->device - ctrl->slot_device_offset;
	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);

	/* Change status to shutdown */
	if (p_slot->is_a_board)
		p_slot->status = 0x01;

	/* turn off slot, turn on Amber LED, turn off Green LED */
	rc = p_slot->hpc_ops->slot_disable(p_slot);
	if (rc) {
		ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
			 __func__);
		return rc;
	}

	rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
	if (rc) {
		ctrl_err(ctrl, "Issue of Set Attention command failed\n");
		return rc;
	}

	p_slot->pwr_save = 0;
	p_slot->is_a_board = 0;

	return 0;
}


struct pushbutton_work_info {
	struct slot *p_slot;
	struct work_struct work;
};

/**
 * shpchp_pushbutton_thread - handle pushbutton events
 * @work: &struct work_struct to be handled
 *
 * Scheduled procedure to handle blocking stuff for the pushbuttons.
 * Handles all pending events and exits.
 */
static void shpchp_pushbutton_thread(struct work_struct *work)
{
	struct pushbutton_work_info *info =
		container_of(work, struct pushbutton_work_info, work);
	struct slot *p_slot = info->p_slot;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case POWEROFF_STATE:
		mutex_unlock(&p_slot->lock);
		shpchp_disable_slot(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	case POWERON_STATE:
		mutex_unlock(&p_slot->lock);
		if (shpchp_enable_slot(p_slot))
			p_slot->hpc_ops->green_led_off(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	default:
		break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
}

void shpchp_queue_pushbutton_work(struct work_struct *work)
{
	struct slot *p_slot = container_of(work, struct slot, work.work);
	struct pushbutton_work_info *info;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
			 __func__);
		return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, shpchp_pushbutton_thread);

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
		p_slot->state = POWEROFF_STATE;
		break;
	case BLINKINGON_STATE:
		p_slot->state = POWERON_STATE;
		break;
	default:
		goto out;
	}
	queue_work(shpchp_wq, &info->work);
 out:
	mutex_unlock(&p_slot->lock);
}

static int update_slot_info (struct slot *slot)
{
	struct hotplug_slot_info *info;
	int result;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

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

	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
	kfree (info);
	return result;
}

/*
 * Note: This function must be called with slot->lock held
 */
static void handle_button_press_event(struct slot *p_slot)
{
	u8 getstatus;
	struct controller *ctrl = p_slot->ctrl;

	switch (p_slot->state) {
	case STATIC_STATE:
		p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (getstatus) {
			p_slot->state = BLINKINGOFF_STATE;
			ctrl_info(ctrl, "PCI slot #%s - powering off due to "
				  "button press.\n", slot_name(p_slot));
		} else {
			p_slot->state = BLINKINGON_STATE;
			ctrl_info(ctrl, "PCI slot #%s - powering on due to "
				  "button press.\n", slot_name(p_slot));
		}
		/* blink green LED and turn off amber */
		p_slot->hpc_ops->green_led_blink(p_slot);
		p_slot->hpc_ops->set_attention_status(p_slot, 0);

		schedule_delayed_work(&p_slot->work, 5*HZ);
		break;
	case BLINKINGOFF_STATE:
	case BLINKINGON_STATE:
		/*
		 * Cancel if we are still blinking; this means that we
		 * press the attention again before the 5 sec. limit
		 * expires to cancel hot-add or hot-remove
		 */
		ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
			  slot_name(p_slot));
		cancel_delayed_work(&p_slot->work);
		if (p_slot->state == BLINKINGOFF_STATE)
			p_slot->hpc_ops->green_led_on(p_slot);
		else
			p_slot->hpc_ops->green_led_off(p_slot);
		p_slot->hpc_ops->set_attention_status(p_slot, 0);
		ctrl_info(ctrl, "PCI slot #%s - action canceled due to "
			  "button press\n", slot_name(p_slot));
		p_slot->state = STATIC_STATE;
		break;
	case POWEROFF_STATE:
	case POWERON_STATE:
		/*
		 * Ignore if the slot is on power-on or power-off state;
		 * this means that the previous attention button action
		 * to hot-add or hot-remove is undergoing
		 */
		ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
			  slot_name(p_slot));
		update_slot_info(p_slot);
		break;
	default:
		ctrl_warn(ctrl, "Not a valid state\n");
		break;
	}
}

static void interrupt_event_handler(struct work_struct *work)
{
	struct event_info *info = container_of(work, struct event_info, work);
	struct slot *p_slot = info->p_slot;

	mutex_lock(&p_slot->lock);
	switch (info->event_type) {
	case INT_BUTTON_PRESS:
		handle_button_press_event(p_slot);
		break;
	case INT_POWER_FAULT:
		ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
		p_slot->hpc_ops->set_attention_status(p_slot, 1);
		p_slot->hpc_ops->green_led_off(p_slot);
		break;
	default:
		update_slot_info(p_slot);
		break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
}


static int shpchp_enable_slot (struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc, retval = -ENODEV;
	struct controller *ctrl = p_slot->ctrl;

	/* Check to see if (latch closed, card present, power off) */
	mutex_lock(&p_slot->ctrl->crit_sect);
	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (rc || !getstatus) {
		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	if (rc || getstatus) {
		ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (rc || getstatus) {
		ctrl_info(ctrl, "Already enabled on slot(%s)\n",
			  slot_name(p_slot));
		goto out;
	}

	p_slot->is_a_board = 1;

	/* We have to save the presence info for these slots */
	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
	p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
	ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

	if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
	    (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
	     && p_slot->ctrl->num_slots == 1) {
		/* handle amd pogo errata; this must be done before enable  */
		amd_pogo_errata_save_misc_reg(p_slot);
		retval = board_added(p_slot);
		/* handle amd pogo errata; this must be done after enable  */
		amd_pogo_errata_restore_misc_reg(p_slot);
	} else
		retval = board_added(p_slot);

	if (retval) {
		p_slot->hpc_ops->get_adapter_status(p_slot,
				&(p_slot->presence_save));
		p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	}

	update_slot_info(p_slot);
 out:
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return retval;
}


static int shpchp_disable_slot (struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc, retval = -ENODEV;
	struct controller *ctrl = p_slot->ctrl;

	if (!p_slot->ctrl)
		return -ENODEV;

	/* Check to see if (latch closed, card present, power on) */
	mutex_lock(&p_slot->ctrl->crit_sect);

	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (rc || !getstatus) {
		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	if (rc || getstatus) {
		ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (rc || !getstatus) {
		ctrl_info(ctrl, "Already disabled on slot(%s)\n",
			  slot_name(p_slot));
		goto out;
	}

	retval = remove_board(p_slot);
	update_slot_info(p_slot);
 out:
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return retval;
}

int shpchp_sysfs_enable_slot(struct slot *p_slot)
{
	int retval = -ENODEV;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGON_STATE:
		cancel_delayed_work(&p_slot->work);
	case STATIC_STATE:
		p_slot->state = POWERON_STATE;
		mutex_unlock(&p_slot->lock);
		retval = shpchp_enable_slot(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	case POWERON_STATE:
		ctrl_info(ctrl, "Slot %s is already in powering on state\n",
			  slot_name(p_slot));
		break;
	case BLINKINGOFF_STATE:
	case POWEROFF_STATE:
		ctrl_info(ctrl, "Already enabled on slot %s\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "Not a valid state on slot %s\n",
			 slot_name(p_slot));
		break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
}

int shpchp_sysfs_disable_slot(struct slot *p_slot)
{
	int retval = -ENODEV;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
		cancel_delayed_work(&p_slot->work);
	case STATIC_STATE:
		p_slot->state = POWEROFF_STATE;
		mutex_unlock(&p_slot->lock);
		retval = shpchp_disable_slot(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	case POWEROFF_STATE:
		ctrl_info(ctrl, "Slot %s is already in powering off state\n",
			  slot_name(p_slot));
		break;
	case BLINKINGON_STATE:
	case POWERON_STATE:
		ctrl_info(ctrl, "Already disabled on slot %s\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "Not a valid state on slot %s\n",
			 slot_name(p_slot));
		break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
}
OpenPOWER on IntegriCloud