summaryrefslogtreecommitdiff
path: root/drivers/scsi/isci/init.c
blob: a81e546595ddf410d893b99fc2108b2282fc26ae (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
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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.  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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/efi.h>
#include <asm/string.h>
#include <scsi/scsi_host.h>
#include "host.h"
#include "isci.h"
#include "task.h"
#include "probe_roms.h"

#define MAJ 1
#define MIN 2
#define BUILD 0
#define DRV_VERSION __stringify(MAJ) "." __stringify(MIN) "." \
	__stringify(BUILD)

MODULE_VERSION(DRV_VERSION);

static struct scsi_transport_template *isci_transport_template;

static const struct pci_device_id isci_id_table[] = {
	{ PCI_VDEVICE(INTEL, 0x1D61),},
	{ PCI_VDEVICE(INTEL, 0x1D63),},
	{ PCI_VDEVICE(INTEL, 0x1D65),},
	{ PCI_VDEVICE(INTEL, 0x1D67),},
	{ PCI_VDEVICE(INTEL, 0x1D69),},
	{ PCI_VDEVICE(INTEL, 0x1D6B),},
	{ PCI_VDEVICE(INTEL, 0x1D60),},
	{ PCI_VDEVICE(INTEL, 0x1D62),},
	{ PCI_VDEVICE(INTEL, 0x1D64),},
	{ PCI_VDEVICE(INTEL, 0x1D66),},
	{ PCI_VDEVICE(INTEL, 0x1D68),},
	{ PCI_VDEVICE(INTEL, 0x1D6A),},
	{}
};

MODULE_DEVICE_TABLE(pci, isci_id_table);

/* linux isci specific settings */

unsigned char no_outbound_task_to = 2;
module_param(no_outbound_task_to, byte, 0);
MODULE_PARM_DESC(no_outbound_task_to, "No Outbound Task Timeout (1us incr)");

u16 ssp_max_occ_to = 20;
module_param(ssp_max_occ_to, ushort, 0);
MODULE_PARM_DESC(ssp_max_occ_to, "SSP Max occupancy timeout (100us incr)");

u16 stp_max_occ_to = 5;
module_param(stp_max_occ_to, ushort, 0);
MODULE_PARM_DESC(stp_max_occ_to, "STP Max occupancy timeout (100us incr)");

u16 ssp_inactive_to = 5;
module_param(ssp_inactive_to, ushort, 0);
MODULE_PARM_DESC(ssp_inactive_to, "SSP inactivity timeout (100us incr)");

u16 stp_inactive_to = 5;
module_param(stp_inactive_to, ushort, 0);
MODULE_PARM_DESC(stp_inactive_to, "STP inactivity timeout (100us incr)");

unsigned char phy_gen = SCIC_SDS_PARM_GEN2_SPEED;
module_param(phy_gen, byte, 0);
MODULE_PARM_DESC(phy_gen, "PHY generation (1: 1.5Gbps 2: 3.0Gbps 3: 6.0Gbps)");

unsigned char max_concurr_spinup;
module_param(max_concurr_spinup, byte, 0);
MODULE_PARM_DESC(max_concurr_spinup, "Max concurrent device spinup");

uint cable_selection_override = CABLE_OVERRIDE_DISABLED;
module_param(cable_selection_override, uint, 0);

MODULE_PARM_DESC(cable_selection_override,
		 "This field indicates length of the SAS/SATA cable between "
		 "host and device. If any bits > 15 are set (default) "
		 "indicates \"use platform defaults\"");

static ssize_t isci_show_id(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = container_of(dev, typeof(*shost), shost_dev);
	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
	struct isci_host *ihost = container_of(sas_ha, typeof(*ihost), sas_ha);

	return snprintf(buf, PAGE_SIZE, "%d\n", ihost->id);
}

static DEVICE_ATTR(isci_id, S_IRUGO, isci_show_id, NULL);

struct device_attribute *isci_host_attrs[] = {
	&dev_attr_isci_id,
	NULL
};

static struct scsi_host_template isci_sht = {

	.module				= THIS_MODULE,
	.name				= DRV_NAME,
	.proc_name			= DRV_NAME,
	.queuecommand			= sas_queuecommand,
	.target_alloc			= sas_target_alloc,
	.slave_configure		= sas_slave_configure,
	.scan_finished			= isci_host_scan_finished,
	.scan_start			= isci_host_start,
	.change_queue_depth		= sas_change_queue_depth,
	.change_queue_type		= sas_change_queue_type,
	.bios_param			= sas_bios_param,
	.can_queue			= ISCI_CAN_QUEUE_VAL,
	.cmd_per_lun			= 1,
	.this_id			= -1,
	.sg_tablesize			= SG_ALL,
	.max_sectors			= SCSI_DEFAULT_MAX_SECTORS,
	.use_clustering			= ENABLE_CLUSTERING,
	.eh_abort_handler		= sas_eh_abort_handler,
	.eh_device_reset_handler        = sas_eh_device_reset_handler,
	.eh_bus_reset_handler           = sas_eh_bus_reset_handler,
	.target_destroy			= sas_target_destroy,
	.ioctl				= sas_ioctl,
	.shost_attrs			= isci_host_attrs,
	.use_blk_tags			= 1,
	.track_queue_depth		= 1,
};

static struct sas_domain_function_template isci_transport_ops  = {

	/* The class calls these to notify the LLDD of an event. */
	.lldd_port_formed	= isci_port_formed,
	.lldd_port_deformed	= isci_port_deformed,

	/* The class calls these when a device is found or gone. */
	.lldd_dev_found		= isci_remote_device_found,
	.lldd_dev_gone		= isci_remote_device_gone,

	.lldd_execute_task	= isci_task_execute_task,
	/* Task Management Functions. Must be called from process context. */
	.lldd_abort_task	= isci_task_abort_task,
	.lldd_abort_task_set	= isci_task_abort_task_set,
	.lldd_clear_aca		= isci_task_clear_aca,
	.lldd_clear_task_set	= isci_task_clear_task_set,
	.lldd_I_T_nexus_reset	= isci_task_I_T_nexus_reset,
	.lldd_lu_reset		= isci_task_lu_reset,
	.lldd_query_task	= isci_task_query_task,

	/* ata recovery called from ata-eh */
	.lldd_ata_check_ready	= isci_ata_check_ready,

	/* Port and Adapter management */
	.lldd_clear_nexus_port	= isci_task_clear_nexus_port,
	.lldd_clear_nexus_ha	= isci_task_clear_nexus_ha,

	/* Phy management */
	.lldd_control_phy	= isci_phy_control,

	/* GPIO support */
	.lldd_write_gpio	= isci_gpio_write,
};


/******************************************************************************
* P R O T E C T E D  M E T H O D S
******************************************************************************/



/**
 * isci_register_sas_ha() - This method initializes various lldd
 *    specific members of the sas_ha struct and calls the libsas
 *    sas_register_ha() function.
 * @isci_host: This parameter specifies the lldd specific wrapper for the
 *    libsas sas_ha struct.
 *
 * This method returns an error code indicating success or failure. The user
 * should check for possible memory allocation error return otherwise, a zero
 * indicates success.
 */
static int isci_register_sas_ha(struct isci_host *isci_host)
{
	int i;
	struct sas_ha_struct *sas_ha = &(isci_host->sas_ha);
	struct asd_sas_phy **sas_phys;
	struct asd_sas_port **sas_ports;

	sas_phys = devm_kzalloc(&isci_host->pdev->dev,
				SCI_MAX_PHYS * sizeof(void *),
				GFP_KERNEL);
	if (!sas_phys)
		return -ENOMEM;

	sas_ports = devm_kzalloc(&isci_host->pdev->dev,
				 SCI_MAX_PORTS * sizeof(void *),
				 GFP_KERNEL);
	if (!sas_ports)
		return -ENOMEM;

	sas_ha->sas_ha_name = DRV_NAME;
	sas_ha->lldd_module = THIS_MODULE;
	sas_ha->sas_addr    = &isci_host->phys[0].sas_addr[0];

	for (i = 0; i < SCI_MAX_PHYS; i++) {
		sas_phys[i] = &isci_host->phys[i].sas_phy;
		sas_ports[i] = &isci_host->sas_ports[i];
	}

	sas_ha->sas_phy  = sas_phys;
	sas_ha->sas_port = sas_ports;
	sas_ha->num_phys = SCI_MAX_PHYS;

	sas_ha->lldd_queue_size = ISCI_CAN_QUEUE_VAL;
	sas_ha->lldd_max_execute_num = 1;
	sas_ha->strict_wide_ports = 1;

	sas_register_ha(sas_ha);

	return 0;
}

static void isci_unregister(struct isci_host *isci_host)
{
	struct Scsi_Host *shost;

	if (!isci_host)
		return;

	sas_unregister_ha(&isci_host->sas_ha);

	shost = to_shost(isci_host);
	sas_remove_host(shost);
	scsi_remove_host(shost);
	scsi_host_put(shost);
}

static int isci_pci_init(struct pci_dev *pdev)
{
	int err, bar_num, bar_mask = 0;
	void __iomem * const *iomap;

	err = pcim_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev,
			"failed enable PCI device %s!\n",
			pci_name(pdev));
		return err;
	}

	for (bar_num = 0; bar_num < SCI_PCI_BAR_COUNT; bar_num++)
		bar_mask |= 1 << (bar_num * 2);

	err = pcim_iomap_regions(pdev, bar_mask, DRV_NAME);
	if (err)
		return err;

	iomap = pcim_iomap_table(pdev);
	if (!iomap)
		return -ENOMEM;

	pci_set_master(pdev);

	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
	if (err) {
		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
		if (err)
			return err;
	}

	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
	if (err) {
		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
		if (err)
			return err;
	}

	return 0;
}

static int num_controllers(struct pci_dev *pdev)
{
	/* bar size alone can tell us if we are running with a dual controller
	 * part, no need to trust revision ids that might be under broken firmware
	 * control
	 */
	resource_size_t scu_bar_size = pci_resource_len(pdev, SCI_SCU_BAR*2);
	resource_size_t smu_bar_size = pci_resource_len(pdev, SCI_SMU_BAR*2);

	if (scu_bar_size >= SCI_SCU_BAR_SIZE*SCI_MAX_CONTROLLERS &&
	    smu_bar_size >= SCI_SMU_BAR_SIZE*SCI_MAX_CONTROLLERS)
		return SCI_MAX_CONTROLLERS;
	else
		return 1;
}

static int isci_setup_interrupts(struct pci_dev *pdev)
{
	int err, i, num_msix;
	struct isci_host *ihost;
	struct isci_pci_info *pci_info = to_pci_info(pdev);

	/*
	 *  Determine the number of vectors associated with this
	 *  PCI function.
	 */
	num_msix = num_controllers(pdev) * SCI_NUM_MSI_X_INT;

	for (i = 0; i < num_msix; i++)
		pci_info->msix_entries[i].entry = i;

	err = pci_enable_msix_exact(pdev, pci_info->msix_entries, num_msix);
	if (err)
		goto intx;

	for (i = 0; i < num_msix; i++) {
		int id = i / SCI_NUM_MSI_X_INT;
		struct msix_entry *msix = &pci_info->msix_entries[i];
		irq_handler_t isr;

		ihost = pci_info->hosts[id];
		/* odd numbered vectors are error interrupts */
		if (i & 1)
			isr = isci_error_isr;
		else
			isr = isci_msix_isr;

		err = devm_request_irq(&pdev->dev, msix->vector, isr, 0,
				       DRV_NAME"-msix", ihost);
		if (!err)
			continue;

		dev_info(&pdev->dev, "msix setup failed falling back to intx\n");
		while (i--) {
			id = i / SCI_NUM_MSI_X_INT;
			ihost = pci_info->hosts[id];
			msix = &pci_info->msix_entries[i];
			devm_free_irq(&pdev->dev, msix->vector, ihost);
		}
		pci_disable_msix(pdev);
		goto intx;
	}
	return 0;

 intx:
	for_each_isci_host(i, ihost, pdev) {
		err = devm_request_irq(&pdev->dev, pdev->irq, isci_intx_isr,
				       IRQF_SHARED, DRV_NAME"-intx", ihost);
		if (err)
			break;
	}
	return err;
}

static void isci_user_parameters_get(struct sci_user_parameters *u)
{
	int i;

	for (i = 0; i < SCI_MAX_PHYS; i++) {
		struct sci_phy_user_params *u_phy = &u->phys[i];

		u_phy->max_speed_generation = phy_gen;

		/* we are not exporting these for now */
		u_phy->align_insertion_frequency = 0x7f;
		u_phy->in_connection_align_insertion_frequency = 0xff;
		u_phy->notify_enable_spin_up_insertion_frequency = 0x33;
	}

	u->stp_inactivity_timeout = stp_inactive_to;
	u->ssp_inactivity_timeout = ssp_inactive_to;
	u->stp_max_occupancy_timeout = stp_max_occ_to;
	u->ssp_max_occupancy_timeout = ssp_max_occ_to;
	u->no_outbound_task_timeout = no_outbound_task_to;
	u->max_concurr_spinup = max_concurr_spinup;
}

static enum sci_status sci_user_parameters_set(struct isci_host *ihost,
					       struct sci_user_parameters *sci_parms)
{
	u16 index;

	/*
	 * Validate the user parameters.  If they are not legal, then
	 * return a failure.
	 */
	for (index = 0; index < SCI_MAX_PHYS; index++) {
		struct sci_phy_user_params *u;

		u = &sci_parms->phys[index];

		if (!((u->max_speed_generation <= SCIC_SDS_PARM_MAX_SPEED) &&
		      (u->max_speed_generation > SCIC_SDS_PARM_NO_SPEED)))
			return SCI_FAILURE_INVALID_PARAMETER_VALUE;

		if (u->in_connection_align_insertion_frequency < 3)
			return SCI_FAILURE_INVALID_PARAMETER_VALUE;

		if ((u->in_connection_align_insertion_frequency < 3) ||
		    (u->align_insertion_frequency == 0) ||
		    (u->notify_enable_spin_up_insertion_frequency == 0))
			return SCI_FAILURE_INVALID_PARAMETER_VALUE;
	}

	if ((sci_parms->stp_inactivity_timeout == 0) ||
	    (sci_parms->ssp_inactivity_timeout == 0) ||
	    (sci_parms->stp_max_occupancy_timeout == 0) ||
	    (sci_parms->ssp_max_occupancy_timeout == 0) ||
	    (sci_parms->no_outbound_task_timeout == 0))
		return SCI_FAILURE_INVALID_PARAMETER_VALUE;

	memcpy(&ihost->user_parameters, sci_parms, sizeof(*sci_parms));

	return SCI_SUCCESS;
}

static void sci_oem_defaults(struct isci_host *ihost)
{
	/* these defaults are overridden by the platform / firmware */
	struct sci_user_parameters *user = &ihost->user_parameters;
	struct sci_oem_params *oem = &ihost->oem_parameters;
	int i;

	/* Default to APC mode. */
	oem->controller.mode_type = SCIC_PORT_AUTOMATIC_CONFIGURATION_MODE;

	/* Default to APC mode. */
	oem->controller.max_concurr_spin_up = 1;

	/* Default to no SSC operation. */
	oem->controller.do_enable_ssc = false;

	/* Default to short cables on all phys. */
	oem->controller.cable_selection_mask = 0;

	/* Initialize all of the port parameter information to narrow ports. */
	for (i = 0; i < SCI_MAX_PORTS; i++)
		oem->ports[i].phy_mask = 0;

	/* Initialize all of the phy parameter information. */
	for (i = 0; i < SCI_MAX_PHYS; i++) {
		/* Default to 3G (i.e. Gen 2). */
		user->phys[i].max_speed_generation = SCIC_SDS_PARM_GEN2_SPEED;

		/* the frequencies cannot be 0 */
		user->phys[i].align_insertion_frequency = 0x7f;
		user->phys[i].in_connection_align_insertion_frequency = 0xff;
		user->phys[i].notify_enable_spin_up_insertion_frequency = 0x33;

		/* Previous Vitesse based expanders had a arbitration issue that
		 * is worked around by having the upper 32-bits of SAS address
		 * with a value greater then the Vitesse company identifier.
		 * Hence, usage of 0x5FCFFFFF.
		 */
		oem->phys[i].sas_address.low = 0x1 + ihost->id;
		oem->phys[i].sas_address.high = 0x5FCFFFFF;
	}

	user->stp_inactivity_timeout = 5;
	user->ssp_inactivity_timeout = 5;
	user->stp_max_occupancy_timeout = 5;
	user->ssp_max_occupancy_timeout = 20;
	user->no_outbound_task_timeout = 2;
}

static struct isci_host *isci_host_alloc(struct pci_dev *pdev, int id)
{
	struct isci_orom *orom = to_pci_info(pdev)->orom;
	struct sci_user_parameters sci_user_params;
	u8 oem_version = ISCI_ROM_VER_1_0;
	struct isci_host *ihost;
	struct Scsi_Host *shost;
	int err, i;

	ihost = devm_kzalloc(&pdev->dev, sizeof(*ihost), GFP_KERNEL);
	if (!ihost)
		return NULL;

	ihost->pdev = pdev;
	ihost->id = id;
	spin_lock_init(&ihost->scic_lock);
	init_waitqueue_head(&ihost->eventq);
	ihost->sas_ha.dev = &ihost->pdev->dev;
	ihost->sas_ha.lldd_ha = ihost;
	tasklet_init(&ihost->completion_tasklet,
		     isci_host_completion_routine, (unsigned long)ihost);

	/* validate module parameters */
	/* TODO: kill struct sci_user_parameters and reference directly */
	sci_oem_defaults(ihost);
	isci_user_parameters_get(&sci_user_params);
	if (sci_user_parameters_set(ihost, &sci_user_params)) {
		dev_warn(&pdev->dev,
			 "%s: sci_user_parameters_set failed\n", __func__);
		return NULL;
	}

	/* sanity check platform (or 'firmware') oem parameters */
	if (orom) {
		if (id < 0 || id >= SCI_MAX_CONTROLLERS || id > orom->hdr.num_elements) {
			dev_warn(&pdev->dev, "parsing firmware oem parameters failed\n");
			return NULL;
		}
		ihost->oem_parameters = orom->ctrl[id];
		oem_version = orom->hdr.version;
	}

	/* validate oem parameters (platform, firmware, or built-in defaults) */
	if (sci_oem_parameters_validate(&ihost->oem_parameters, oem_version)) {
		dev_warn(&pdev->dev, "oem parameter validation failed\n");
		return NULL;
	}

	for (i = 0; i < SCI_MAX_PORTS; i++) {
		struct isci_port *iport = &ihost->ports[i];

		INIT_LIST_HEAD(&iport->remote_dev_list);
		iport->isci_host = ihost;
	}

	for (i = 0; i < SCI_MAX_PHYS; i++)
		isci_phy_init(&ihost->phys[i], ihost, i);

	for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
		struct isci_remote_device *idev = &ihost->devices[i];

		INIT_LIST_HEAD(&idev->node);
	}

	shost = scsi_host_alloc(&isci_sht, sizeof(void *));
	if (!shost)
		return NULL;

	dev_info(&pdev->dev, "%sSCU controller %d: phy 3-0 cables: "
		 "{%s, %s, %s, %s}\n",
		 (is_cable_select_overridden() ? "* " : ""), ihost->id,
		 lookup_cable_names(decode_cable_selection(ihost, 3)),
		 lookup_cable_names(decode_cable_selection(ihost, 2)),
		 lookup_cable_names(decode_cable_selection(ihost, 1)),
		 lookup_cable_names(decode_cable_selection(ihost, 0)));

	err = isci_host_init(ihost);
	if (err)
		goto err_shost;

	SHOST_TO_SAS_HA(shost) = &ihost->sas_ha;
	ihost->sas_ha.core.shost = shost;
	shost->transportt = isci_transport_template;

	shost->max_id = ~0;
	shost->max_lun = ~0;
	shost->max_cmd_len = MAX_COMMAND_SIZE;

	err = scsi_add_host(shost, &pdev->dev);
	if (err)
		goto err_shost;

	err = isci_register_sas_ha(ihost);
	if (err)
		goto err_shost_remove;

	return ihost;

 err_shost_remove:
	scsi_remove_host(shost);
 err_shost:
	scsi_host_put(shost);

	return NULL;
}

static int isci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct isci_pci_info *pci_info;
	int err, i;
	struct isci_host *isci_host;
	const struct firmware *fw = NULL;
	struct isci_orom *orom = NULL;
	char *source = "(platform)";

	dev_info(&pdev->dev, "driver configured for rev: %d silicon\n",
		 pdev->revision);

	pci_info = devm_kzalloc(&pdev->dev, sizeof(*pci_info), GFP_KERNEL);
	if (!pci_info)
		return -ENOMEM;
	pci_set_drvdata(pdev, pci_info);

	if (efi_enabled(EFI_RUNTIME_SERVICES))
		orom = isci_get_efi_var(pdev);

	if (!orom)
		orom = isci_request_oprom(pdev);

	for (i = 0; orom && i < num_controllers(pdev); i++) {
		if (sci_oem_parameters_validate(&orom->ctrl[i],
						orom->hdr.version)) {
			dev_warn(&pdev->dev,
				 "[%d]: invalid oem parameters detected, falling back to firmware\n", i);
			orom = NULL;
			break;
		}
	}

	if (!orom) {
		source = "(firmware)";
		orom = isci_request_firmware(pdev, fw);
		if (!orom) {
			/* TODO convert this to WARN_TAINT_ONCE once the
			 * orom/efi parameter support is widely available
			 */
			dev_warn(&pdev->dev,
				 "Loading user firmware failed, using default "
				 "values\n");
			dev_warn(&pdev->dev,
				 "Default OEM configuration being used: 4 "
				 "narrow ports, and default SAS Addresses\n");
		}
	}

	if (orom)
		dev_info(&pdev->dev,
			 "OEM SAS parameters (version: %u.%u) loaded %s\n",
			 (orom->hdr.version & 0xf0) >> 4,
			 (orom->hdr.version & 0xf), source);

	pci_info->orom = orom;

	err = isci_pci_init(pdev);
	if (err)
		return err;

	for (i = 0; i < num_controllers(pdev); i++) {
		struct isci_host *h = isci_host_alloc(pdev, i);

		if (!h) {
			err = -ENOMEM;
			goto err_host_alloc;
		}
		pci_info->hosts[i] = h;

		/* turn on DIF support */
		scsi_host_set_prot(to_shost(h),
				   SHOST_DIF_TYPE1_PROTECTION |
				   SHOST_DIF_TYPE2_PROTECTION |
				   SHOST_DIF_TYPE3_PROTECTION);
		scsi_host_set_guard(to_shost(h), SHOST_DIX_GUARD_CRC);
	}

	err = isci_setup_interrupts(pdev);
	if (err)
		goto err_host_alloc;

	for_each_isci_host(i, isci_host, pdev)
		scsi_scan_host(to_shost(isci_host));

	return 0;

 err_host_alloc:
	for_each_isci_host(i, isci_host, pdev)
		isci_unregister(isci_host);
	return err;
}

static void isci_pci_remove(struct pci_dev *pdev)
{
	struct isci_host *ihost;
	int i;

	for_each_isci_host(i, ihost, pdev) {
		wait_for_start(ihost);
		isci_unregister(ihost);
		isci_host_deinit(ihost);
	}
}

#ifdef CONFIG_PM_SLEEP
static int isci_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct isci_host *ihost;
	int i;

	for_each_isci_host(i, ihost, pdev) {
		sas_suspend_ha(&ihost->sas_ha);
		isci_host_deinit(ihost);
	}

	pci_save_state(pdev);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, PCI_D3hot);

	return 0;
}

static int isci_resume(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct isci_host *ihost;
	int rc, i;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);

	rc = pcim_enable_device(pdev);
	if (rc) {
		dev_err(&pdev->dev,
			"enabling device failure after resume(%d)\n", rc);
		return rc;
	}

	pci_set_master(pdev);

	for_each_isci_host(i, ihost, pdev) {
		sas_prep_resume_ha(&ihost->sas_ha);

		isci_host_init(ihost);
		isci_host_start(ihost->sas_ha.core.shost);
		wait_for_start(ihost);

		sas_resume_ha(&ihost->sas_ha);
	}

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(isci_pm_ops, isci_suspend, isci_resume);

static struct pci_driver isci_pci_driver = {
	.name		= DRV_NAME,
	.id_table	= isci_id_table,
	.probe		= isci_pci_probe,
	.remove		= isci_pci_remove,
	.driver.pm      = &isci_pm_ops,
};

static __init int isci_init(void)
{
	int err;

	pr_info("%s: Intel(R) C600 SAS Controller Driver - version %s\n",
		DRV_NAME, DRV_VERSION);

	isci_transport_template = sas_domain_attach_transport(&isci_transport_ops);
	if (!isci_transport_template)
		return -ENOMEM;

	err = pci_register_driver(&isci_pci_driver);
	if (err)
		sas_release_transport(isci_transport_template);

	return err;
}

static __exit void isci_exit(void)
{
	pci_unregister_driver(&isci_pci_driver);
	sas_release_transport(isci_transport_template);
}

MODULE_LICENSE("Dual BSD/GPL");
MODULE_FIRMWARE(ISCI_FW_NAME);
module_init(isci_init);
module_exit(isci_exit);