summaryrefslogtreecommitdiffstats
path: root/drivers/pci/hotplug/pciehprm_acpi.c
blob: 078550ba2708a7ccae97a8f7f52c9cfbcf964868 (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
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
/*
 * PCIEHPRM ACPI: PHP Resource Manager for ACPI platform
 *
 * 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 <kristen.c.accardi@intel.com>
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/pci-acpi.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/actypes.h>
#include "pciehp.h"
#include "pciehprm.h"

#define	PCI_MAX_BUS		0x100
#define	ACPI_STA_DEVICE_PRESENT	0x01

#define	METHOD_NAME__SUN	"_SUN"
#define	METHOD_NAME__HPP	"_HPP"
#define	METHOD_NAME_OSHP	"OSHP"

/* Status code for running acpi method to gain native control */
#define NC_NOT_RUN	0
#define OSC_NOT_EXIST	1
#define OSC_RUN_FAILED	2
#define OSHP_NOT_EXIST	3
#define OSHP_RUN_FAILED	4
#define NC_RUN_SUCCESS	5

#define	PHP_RES_BUS		0xA0
#define	PHP_RES_IO		0xA1
#define	PHP_RES_MEM		0xA2
#define	PHP_RES_PMEM		0xA3

#define	BRIDGE_TYPE_P2P		0x00
#define	BRIDGE_TYPE_HOST	0x01

/* this should go to drivers/acpi/include/ */
struct acpi__hpp {
	u8	cache_line_size;
	u8	latency_timer;
	u8	enable_serr;
	u8	enable_perr;
};

struct acpi_php_slot {
	struct acpi_php_slot	*next;
	struct acpi_bridge	*bridge;
	acpi_handle	handle;
	int	seg;
	int	bus;
	int	dev;
	int	fun;
	u32	sun;
	void	*slot_ops;	/* _STA, _EJx, etc */
	struct slot *slot;
};		/* per func */

struct acpi_bridge {
	struct acpi_bridge	*parent;
	struct acpi_bridge	*next;
	struct acpi_bridge	*child;
	acpi_handle	handle;
	int seg;
	int pbus;			/* pdev->bus->number		*/
	int pdevice;			/* PCI_SLOT(pdev->devfn)	*/
	int pfunction;			/* PCI_DEVFN(pdev->devfn)	*/
	int bus;			/* pdev->subordinate->number	*/
	struct acpi__hpp		*_hpp;
	struct acpi_php_slot	*slots;
	int scanned;
	int type;
};

static struct acpi_bridge *acpi_bridges_head;

static u8 * acpi_path_name( acpi_handle	handle)
{
	acpi_status		status;
	static u8		path_name[ACPI_PATHNAME_MAX];
	struct acpi_buffer	ret_buf = { ACPI_PATHNAME_MAX, path_name };

	memset(path_name, 0, sizeof (path_name));
	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &ret_buf);

	if (ACPI_FAILURE(status))
		return NULL;
	else
		return path_name;	
}

static void acpi_get__hpp ( struct acpi_bridge	*ab);
static int acpi_run_oshp ( struct acpi_bridge	*ab);
static int osc_run_status = NC_NOT_RUN;
static int oshp_run_status = NC_NOT_RUN;

static int acpi_add_slot_to_php_slots(
	struct acpi_bridge	*ab,
	int			bus_num,
	acpi_handle		handle,
	u32			adr,
	u32			sun
	)
{
	struct acpi_php_slot	*aps;
	static long	samesun = -1;

	aps = (struct acpi_php_slot *) kmalloc (sizeof(struct acpi_php_slot), GFP_KERNEL);
	if (!aps) {
		err ("acpi_pciehprm: alloc for aps fail\n");
		return -1;
	}
	memset(aps, 0, sizeof(struct acpi_php_slot));

	aps->handle = handle;
	aps->bus = bus_num;
	aps->dev = (adr >> 16) & 0xffff;
	aps->fun = adr & 0xffff;
	aps->sun = sun;

	aps->next = ab->slots;	/* cling to the bridge */
	aps->bridge = ab;
	ab->slots = aps;

	ab->scanned += 1;
	if (!ab->_hpp)
		acpi_get__hpp(ab);
	
	if (osc_run_status == OSC_NOT_EXIST)
		oshp_run_status = acpi_run_oshp(ab);

	if (sun != samesun) {
		info("acpi_pciehprm:   Slot sun(%x) at s:b:d:f=0x%02x:%02x:%02x:%02x\n", 
			aps->sun, ab->seg, aps->bus, aps->dev, aps->fun);
		samesun = sun;
	}
	return 0;
}

static void acpi_get__hpp ( struct acpi_bridge	*ab)
{
	acpi_status		status;
	u8			nui[4];
	struct acpi_buffer	ret_buf = { 0, NULL};
	union acpi_object	*ext_obj, *package;
	u8			*path_name = acpi_path_name(ab->handle);
	int			i, len = 0;

	/* get _hpp */
	status = acpi_evaluate_object(ab->handle, METHOD_NAME__HPP, NULL, &ret_buf);
	switch (status) {
	case AE_BUFFER_OVERFLOW:
		ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
		if (!ret_buf.pointer) {
			err ("acpi_pciehprm:%s alloc for _HPP fail\n", path_name);
			return;
		}
		status = acpi_evaluate_object(ab->handle, METHOD_NAME__HPP, NULL, &ret_buf);
		if (ACPI_SUCCESS(status))
			break;
	default:
		if (ACPI_FAILURE(status)) {
			err("acpi_pciehprm:%s _HPP fail=0x%x\n", path_name, status);
			return;
		}
	}

	ext_obj = (union acpi_object *) ret_buf.pointer;
	if (ext_obj->type != ACPI_TYPE_PACKAGE) {
		err ("acpi_pciehprm:%s _HPP obj not a package\n", path_name);
		goto free_and_return;
	}

	len = ext_obj->package.count;
	package = (union acpi_object *) ret_buf.pointer;
	for ( i = 0; (i < len) || (i < 4); i++) {
		ext_obj = (union acpi_object *) &package->package.elements[i];
		switch (ext_obj->type) {
		case ACPI_TYPE_INTEGER:
			nui[i] = (u8)ext_obj->integer.value;
			break;
		default:
			err ("acpi_pciehprm:%s _HPP obj type incorrect\n", path_name);
			goto free_and_return;
		}
	}

	ab->_hpp = kmalloc (sizeof (struct acpi__hpp), GFP_KERNEL);
	if (!ab->_hpp) {
		err ("acpi_pciehprm:%s alloc for _HPP failed\n", path_name);
		goto free_and_return;
	}
	memset(ab->_hpp, 0, sizeof(struct acpi__hpp));

	ab->_hpp->cache_line_size	= nui[0];
	ab->_hpp->latency_timer		= nui[1];
	ab->_hpp->enable_serr		= nui[2];
	ab->_hpp->enable_perr		= nui[3];

	dbg("  _HPP: cache_line_size=0x%x\n", ab->_hpp->cache_line_size);
	dbg("  _HPP: latency timer  =0x%x\n", ab->_hpp->latency_timer);
	dbg("  _HPP: enable SERR    =0x%x\n", ab->_hpp->enable_serr);
	dbg("  _HPP: enable PERR    =0x%x\n", ab->_hpp->enable_perr);

free_and_return:
	kfree(ret_buf.pointer);
}

static int acpi_run_oshp ( struct acpi_bridge	*ab)
{
	acpi_status		status;
	u8			*path_name = acpi_path_name(ab->handle);

	/* run OSHP */
	status = acpi_evaluate_object(ab->handle, METHOD_NAME_OSHP, NULL, NULL);
	if (ACPI_FAILURE(status)) {
		err("acpi_pciehprm:%s OSHP fails=0x%x\n", path_name, status);
		oshp_run_status = (status == AE_NOT_FOUND) ? OSHP_NOT_EXIST : OSHP_RUN_FAILED;
	} else {
		oshp_run_status = NC_RUN_SUCCESS;
		dbg("acpi_pciehprm:%s OSHP passes =0x%x\n", path_name, status);
		dbg("acpi_pciehprm:%s oshp_run_status =0x%x\n", path_name, oshp_run_status);
	}
	return oshp_run_status;
}

/* find acpi_bridge downword from ab.  */
static struct acpi_bridge *
find_acpi_bridge_by_bus(
	struct acpi_bridge *ab,
	int seg,
	int bus		/* pdev->subordinate->number */
	)
{
	struct acpi_bridge	*lab = NULL;

	if (!ab)
		return NULL;

	if ((ab->bus == bus) && (ab->seg == seg))
		return ab;

	if (ab->child)
		lab = find_acpi_bridge_by_bus(ab->child, seg, bus);

	if (!lab)
	if (ab->next)
		lab = find_acpi_bridge_by_bus(ab->next, seg, bus);

	return lab;
}

/*
 * Build a device tree of ACPI PCI Bridges
 */
static void pciehprm_acpi_register_a_bridge (
	struct acpi_bridge	**head,
	struct acpi_bridge	*pab,	/* parent bridge to which child bridge is added */
	struct acpi_bridge	*cab	/* child bridge to add */
	)
{
	struct acpi_bridge	*lpab;
	struct acpi_bridge	*lcab;

	lpab = find_acpi_bridge_by_bus(*head, pab->seg, pab->bus);
	if (!lpab) {
		if (!(pab->type & BRIDGE_TYPE_HOST))
			warn("PCI parent bridge s:b(%x:%x) not in list.\n", pab->seg, pab->bus);
		pab->next = *head;
		*head = pab;
		lpab = pab;
	}

	if ((cab->type & BRIDGE_TYPE_HOST) && (pab == cab))
		return;

	lcab = find_acpi_bridge_by_bus(*head, cab->seg, cab->bus);
	if (lcab) {
		if ((pab->bus != lcab->parent->bus) || (lcab->bus != cab->bus))
			err("PCI child bridge s:b(%x:%x) in list with diff parent.\n", cab->seg, cab->bus);
		return;
	} else
		lcab = cab;

	lcab->parent = lpab;
	lcab->next = lpab->child;
	lpab->child = lcab;
}

static acpi_status pciehprm_acpi_build_php_slots_callback(
	acpi_handle		handle,
	u32			Level,
	void			*context,
	void			**retval
	)
{
	ulong		bus_num;
	ulong		seg_num;
	ulong		sun, adr;
	ulong		padr = 0;
	acpi_handle		phandle = NULL;
	struct acpi_bridge	*pab = (struct acpi_bridge *)context;
	struct acpi_bridge	*lab;
	acpi_status		status;
	u8			*path_name = acpi_path_name(handle);

	/* get _SUN */
	status = acpi_evaluate_integer(handle, METHOD_NAME__SUN, NULL, &sun);
	switch(status) {
	case AE_NOT_FOUND:
		return AE_OK;
	default:
		if (ACPI_FAILURE(status)) {
			err("acpi_pciehprm:%s _SUN fail=0x%x\n", path_name, status);
			return status;
		}
	}

	/* get _ADR. _ADR must exist if _SUN exists */
	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
	if (ACPI_FAILURE(status)) {
		err("acpi_pciehprm:%s _ADR fail=0x%x\n", path_name, status);
		return status;
	}

	dbg("acpi_pciehprm:%s sun=0x%08x adr=0x%08x\n", path_name, (u32)sun, (u32)adr);

	status = acpi_get_parent(handle, &phandle);
	if (ACPI_FAILURE(status)) {
		err("acpi_pciehprm:%s get_parent fail=0x%x\n", path_name, status);
		return (status);
	}

	bus_num = pab->bus;
	seg_num = pab->seg;

	if (pab->bus == bus_num) {
		lab = pab;
	} else {
		dbg("WARN: pab is not parent\n");
		lab = find_acpi_bridge_by_bus(pab, seg_num, bus_num);
		if (!lab) {
			dbg("acpi_pciehprm: alloc new P2P bridge(%x) for sun(%08x)\n", (u32)bus_num, (u32)sun);
			lab = (struct acpi_bridge *)kmalloc(sizeof(struct acpi_bridge), GFP_KERNEL);
			if (!lab) {
				err("acpi_pciehprm: alloc for ab fail\n");
				return AE_NO_MEMORY;
			}
			memset(lab, 0, sizeof(struct acpi_bridge));

			lab->handle = phandle;
			lab->pbus = pab->bus;
			lab->pdevice = (int)(padr >> 16) & 0xffff;
			lab->pfunction = (int)(padr & 0xffff);
			lab->bus = (int)bus_num;
			lab->scanned = 0;
			lab->type = BRIDGE_TYPE_P2P;

			pciehprm_acpi_register_a_bridge (&acpi_bridges_head, pab, lab);
		} else
			dbg("acpi_pciehprm: found P2P bridge(%x) for sun(%08x)\n", (u32)bus_num, (u32)sun);
	}

	acpi_add_slot_to_php_slots(lab, (int)bus_num, handle, (u32)adr, (u32)sun);

	return (status);
}

static int pciehprm_acpi_build_php_slots(
	struct acpi_bridge	*ab,
	u32			depth
	)
{
	acpi_status	status;
	u8		*path_name = acpi_path_name(ab->handle);

	/* Walk down this pci bridge to get _SUNs if any behind P2P */
	status = acpi_walk_namespace ( ACPI_TYPE_DEVICE,
				ab->handle,
				depth,
				pciehprm_acpi_build_php_slots_callback,
				ab,
				NULL );
	if (ACPI_FAILURE(status)) {
		dbg("acpi_pciehprm:%s walk for _SUN on pci bridge seg:bus(%x:%x) fail=0x%x\n", path_name, ab->seg, ab->bus, status);
		return -1;
	}

	return 0;
}

static void build_a_bridge(
	struct acpi_bridge	*pab,
	struct acpi_bridge	*ab
	)
{
	u8		*path_name = acpi_path_name(ab->handle);

	pciehprm_acpi_register_a_bridge (&acpi_bridges_head, pab, ab);

	switch (ab->type) {
	case BRIDGE_TYPE_HOST:
		dbg("acpi_pciehprm: Registered PCI HOST Bridge(%02x)    on s:b:d:f(%02x:%02x:%02x:%02x) [%s]\n",
			ab->bus, ab->seg, ab->pbus, ab->pdevice, ab->pfunction, path_name);
		break;
	case BRIDGE_TYPE_P2P:
		dbg("acpi_pciehprm: Registered PCI  P2P Bridge(%02x-%02x) on s:b:d:f(%02x:%02x:%02x:%02x) [%s]\n",
			ab->pbus, ab->bus, ab->seg, ab->pbus, ab->pdevice, ab->pfunction, path_name);
		break;
	};

	/* build any immediate PHP slots under this pci bridge */
	pciehprm_acpi_build_php_slots(ab, 1);
}

static struct acpi_bridge * add_p2p_bridge(
	acpi_handle handle,
	struct acpi_bridge	*pab,	/* parent */
	ulong	adr
	)
{
	struct acpi_bridge	*ab;
	struct pci_dev	*pdev;
	ulong		devnum, funcnum;
	u8			*path_name = acpi_path_name(handle);

	ab = (struct acpi_bridge *) kmalloc (sizeof(struct acpi_bridge), GFP_KERNEL);
	if (!ab) {
		err("acpi_pciehprm: alloc for ab fail\n");
		return NULL;
	}
	memset(ab, 0, sizeof(struct acpi_bridge));

	devnum = (adr >> 16) & 0xffff;
	funcnum = adr & 0xffff;

	pdev = pci_find_slot(pab->bus, PCI_DEVFN(devnum, funcnum));
	if (!pdev || !pdev->subordinate) {
		err("acpi_pciehprm:%s is not a P2P Bridge\n", path_name);
		kfree(ab);
		return NULL;
	}

	ab->handle = handle;
	ab->seg = pab->seg;
	ab->pbus = pab->bus;		/* or pdev->bus->number */
	ab->pdevice = devnum;		/* or PCI_SLOT(pdev->devfn) */
	ab->pfunction = funcnum;	/* or PCI_FUNC(pdev->devfn) */
	ab->bus = pdev->subordinate->number;
	ab->scanned = 0;
	ab->type = BRIDGE_TYPE_P2P;

	dbg("acpi_pciehprm: P2P(%x-%x) on pci=b:d:f(%x:%x:%x) acpi=b:d:f(%x:%x:%x) [%s]\n",
		pab->bus, ab->bus, pdev->bus->number, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
		pab->bus, (u32)devnum, (u32)funcnum, path_name);

	build_a_bridge(pab, ab);

	return ab;
}

static acpi_status scan_p2p_bridge(
	acpi_handle		handle,
	u32			Level,
	void			*context,
	void			**retval
	)
{
	struct acpi_bridge	*pab = (struct acpi_bridge *)context;
	struct acpi_bridge	*ab;
	acpi_status		status;
	ulong			adr = 0;
	u8			*path_name = acpi_path_name(handle);
	ulong			devnum, funcnum;
	struct pci_dev		*pdev;

	/* get device, function */
	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND)
			err("acpi_pciehprm:%s _ADR fail=0x%x\n", path_name, status);
		return AE_OK;
	}

	devnum = (adr >> 16) & 0xffff;
	funcnum = adr & 0xffff;

	pdev = pci_find_slot(pab->bus, PCI_DEVFN(devnum, funcnum));
	if (!pdev)
		return AE_OK;
	if (!pdev->subordinate)
		return AE_OK;

	ab = add_p2p_bridge(handle, pab, adr);
	if (ab) {
		status = acpi_walk_namespace ( ACPI_TYPE_DEVICE,
					handle,
					(u32)1,
					scan_p2p_bridge,
					ab,
					NULL);
		if (ACPI_FAILURE(status))
			dbg("acpi_pciehprm:%s find_p2p fail=0x%x\n", path_name, status);
	}

	return AE_OK;
}

static struct acpi_bridge * add_host_bridge(
	acpi_handle handle,
	ulong	segnum,
	ulong	busnum
	)
{
	ulong			adr = 0;
	acpi_status		status;
	struct acpi_bridge	*ab;
	u8			*path_name = acpi_path_name(handle);

	/* get device, function: host br adr is always 0000 though.  */
	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
	if (ACPI_FAILURE(status)) {
		err("acpi_pciehprm:%s _ADR fail=0x%x\n", path_name, status);
		return NULL;
	}
	dbg("acpi_pciehprm: ROOT PCI seg(0x%x)bus(0x%x)dev(0x%x)func(0x%x) [%s]\n", (u32)segnum, 
		(u32)busnum, (u32)(adr >> 16) & 0xffff, (u32)adr & 0xffff, path_name);

	ab = (struct acpi_bridge *) kmalloc (sizeof(struct acpi_bridge), GFP_KERNEL);
	if (!ab) {
		err("acpi_pciehprm: alloc for ab fail\n");
		return NULL;
	}
	memset(ab, 0, sizeof(struct acpi_bridge));

	ab->handle = handle;
	ab->seg = (int)segnum;
	ab->bus = ab->pbus = (int)busnum;
	ab->pdevice = (int)(adr >> 16) & 0xffff;
	ab->pfunction = (int)(adr & 0xffff);
	ab->scanned = 0;
	ab->type = BRIDGE_TYPE_HOST;

	status = pci_osc_control_set (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL); 
	if (ACPI_FAILURE(status)) {
		err("%s: status %x\n", __FUNCTION__, status);
		osc_run_status = (status == AE_NOT_FOUND) ? OSC_NOT_EXIST : OSC_RUN_FAILED;
	} else {
		osc_run_status = NC_RUN_SUCCESS;
	}	
	dbg("%s: osc_run_status %x\n", __FUNCTION__, osc_run_status);
	
	build_a_bridge(ab, ab);

	return ab;
}

static acpi_status acpi_scan_from_root_pci_callback (
	acpi_handle	handle,
	u32			Level,
	void		*context,
	void		**retval
	)
{
	ulong		segnum = 0;
	ulong		busnum = 0;
	acpi_status		status;
	struct acpi_bridge	*ab;
	u8			*path_name = acpi_path_name(handle);

	/* get bus number of this pci root bridge */
	status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &segnum);
	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND) {
			err("acpi_pciehprm:%s evaluate _SEG fail=0x%x\n", path_name, status);
			return status;
		}
		segnum = 0;
	}

	/* get bus number of this pci root bridge */
	status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL, &busnum);
	if (ACPI_FAILURE(status)) {
		err("acpi_pciehprm:%s evaluate _BBN fail=0x%x\n", path_name, status);
		return (status);
	}

	ab = add_host_bridge(handle, segnum, busnum);
	if (ab) {
		status = acpi_walk_namespace ( ACPI_TYPE_DEVICE,
					handle,
					1,
					scan_p2p_bridge,
					ab,
					NULL);
		if (ACPI_FAILURE(status))
			dbg("acpi_pciehprm:%s find_p2p fail=0x%x\n", path_name, status);
	}

	return AE_OK;
}

static int pciehprm_acpi_scan_pci (void)
{
	acpi_status	status;

	/*
	 * TBD: traverse LDM device tree with the help of
	 *  unified ACPI augmented for php device population.
	 */
	status = acpi_get_devices ( PCI_ROOT_HID_STRING,
				acpi_scan_from_root_pci_callback,
				NULL,
				NULL );
	if (ACPI_FAILURE(status)) {
		err("acpi_pciehprm:get_device PCI ROOT HID fail=0x%x\n", status);
		return -1;
	}

	return 0;
}

int pciehprm_init(enum php_ctlr_type ctlr_type)
{
	int	rc;

	if (ctlr_type != PCI)
		return -ENODEV;

	dbg("pciehprm ACPI init <enter>\n");
	acpi_bridges_head = NULL;

	/* construct PCI bus:device tree of acpi_handles */
	rc = pciehprm_acpi_scan_pci();
	if (rc)
		return rc;

	if ((oshp_run_status != NC_RUN_SUCCESS) && (osc_run_status != NC_RUN_SUCCESS)) {
		err("Fails to gain control of native hot-plug\n");
		rc = -ENODEV;
	}

	dbg("pciehprm ACPI init %s\n", (rc)?"fail":"success");
	return rc;
}

static void free_a_slot(struct acpi_php_slot *aps)
{
	dbg("        free a php func of slot(0x%02x) on PCI b:d:f=0x%02x:%02x:%02x\n", aps->sun, aps->bus, aps->dev, aps->fun);

	kfree(aps);
}

static void free_a_bridge( struct acpi_bridge	*ab)
{
	struct acpi_php_slot	*aps, *next;

	switch (ab->type) {
	case BRIDGE_TYPE_HOST:
		dbg("Free ACPI PCI HOST Bridge(%x) [%s] on s:b:d:f(%x:%x:%x:%x)\n",
			ab->bus, acpi_path_name(ab->handle), ab->seg, ab->pbus, ab->pdevice, ab->pfunction);
		break;
	case BRIDGE_TYPE_P2P:
		dbg("Free ACPI PCI P2P Bridge(%x-%x) [%s] on s:b:d:f(%x:%x:%x:%x)\n",
			ab->pbus, ab->bus, acpi_path_name(ab->handle), ab->seg, ab->pbus, ab->pdevice, ab->pfunction);
		break;
	};

	/* free slots first */
	for (aps = ab->slots; aps; aps = next) {
		next = aps->next;
		free_a_slot(aps);
	}

	kfree(ab);
}

static void pciehprm_free_bridges ( struct acpi_bridge	*ab)
{
	if (!ab)
		return;

	if (ab->child)
		pciehprm_free_bridges (ab->child);

	if (ab->next)
		pciehprm_free_bridges (ab->next);

	free_a_bridge(ab);
}

void pciehprm_cleanup(void)
{
	pciehprm_free_bridges (acpi_bridges_head);
}

static int get_number_of_slots (
	struct acpi_bridge	*ab,
	int				selfonly
	)
{
	struct acpi_php_slot	*aps;
	int	prev_slot = -1;
	int	slot_num = 0;

	for ( aps = ab->slots; aps; aps = aps->next)
		if (aps->dev != prev_slot) {
			prev_slot = aps->dev;
			slot_num++;
		}

	if (ab->child)
		slot_num += get_number_of_slots (ab->child, 0);

	if (selfonly)
		return slot_num;

	if (ab->next)
		slot_num += get_number_of_slots (ab->next, 0);

	return slot_num;
}

static struct acpi_php_slot * get_acpi_slot (
	struct acpi_bridge *ab,
	u32 sun
	)
{
	struct acpi_php_slot	*aps = NULL;

	for ( aps = ab->slots; aps; aps = aps->next)
		if (aps->sun == sun)
			return aps;

	if (!aps && ab->child) {
		aps = (struct acpi_php_slot *)get_acpi_slot (ab->child, sun);
		if (aps)
			return aps;
	}

	if (!aps && ab->next) {
		aps = (struct acpi_php_slot *)get_acpi_slot (ab->next, sun);
		if (aps)
			return aps;
	}

	return aps;

}

#if 0
void * pciehprm_get_slot(struct slot *slot)
{
	struct acpi_bridge	*ab = acpi_bridges_head;
	struct acpi_php_slot	*aps = get_acpi_slot (ab, slot->number);

	aps->slot = slot;

	dbg("Got acpi slot sun(%x): s:b:d:f(%x:%x:%x:%x)\n", aps->sun, aps->seg, aps->bus, aps->dev, aps->fun);

	return (void *)aps;
}
#endif

int pciehprm_set_hpp(
	struct controller *ctrl,
	struct pci_func *func,
	u8	card_type
	)
{
	struct acpi_bridge	*ab;
	struct pci_bus lpci_bus, *pci_bus;
	int				rc = 0;
	unsigned int	devfn;
	u8				cls= 0x08;	/* default cache line size	*/
	u8				lt = 0x40;	/* default latency timer	*/
	u8				ep = 0;
	u8				es = 0;

	memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
	pci_bus = &lpci_bus;
	pci_bus->number = func->bus;
	devfn = PCI_DEVFN(func->device, func->function);

	ab = find_acpi_bridge_by_bus(acpi_bridges_head, ctrl->seg, ctrl->bus);

	if (ab) {
		if (ab->_hpp) {
			lt  = (u8)ab->_hpp->latency_timer;
			cls = (u8)ab->_hpp->cache_line_size;
			ep  = (u8)ab->_hpp->enable_perr;
			es  = (u8)ab->_hpp->enable_serr;
		} else
			dbg("_hpp: no _hpp for B/D/F=%#x/%#x/%#x. use default value\n", func->bus, func->device, func->function);
	} else
		dbg("_hpp: no acpi bridge for B/D/F = %#x/%#x/%#x. use default value\n", func->bus, func->device, func->function);


	if (card_type == PCI_HEADER_TYPE_BRIDGE) {
		/* set subordinate Latency Timer */
		rc |= pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, lt);
	}

	/* set base Latency Timer */
	rc |= pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, lt);
	dbg("  set latency timer  =0x%02x: %x\n", lt, rc);

	rc |= pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, cls);
	dbg("  set cache_line_size=0x%02x: %x\n", cls, rc);

	return rc;
}

void pciehprm_enable_card(
	struct controller *ctrl,
	struct pci_func *func,
	u8 card_type)
{
	u16 command, cmd, bcommand, bcmd;
	struct pci_bus lpci_bus, *pci_bus;
	struct acpi_bridge	*ab;
	unsigned int devfn;
	int rc;

	memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
	pci_bus = &lpci_bus;
	pci_bus->number = func->bus;
	devfn = PCI_DEVFN(func->device, func->function);

	rc = pci_bus_read_config_word(pci_bus, devfn, PCI_COMMAND, &cmd);

	if (card_type == PCI_HEADER_TYPE_BRIDGE) {
		rc = pci_bus_read_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, &bcmd);
	}

	command  = cmd | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
		| PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
	bcommand  = bcmd | PCI_BRIDGE_CTL_NO_ISA;

	ab = find_acpi_bridge_by_bus(acpi_bridges_head, ctrl->seg, ctrl->bus);
	if (ab) {
		if (ab->_hpp) {
			if (ab->_hpp->enable_perr) {
				command |= PCI_COMMAND_PARITY;
				bcommand |= PCI_BRIDGE_CTL_PARITY;
			} else {
				command &= ~PCI_COMMAND_PARITY;
				bcommand &= ~PCI_BRIDGE_CTL_PARITY;
			}
			if (ab->_hpp->enable_serr) {
				command |= PCI_COMMAND_SERR;
				bcommand |= PCI_BRIDGE_CTL_SERR;
			} else {
				command &= ~PCI_COMMAND_SERR;
				bcommand &= ~PCI_BRIDGE_CTL_SERR;
			}
		} else
			dbg("no _hpp for B/D/F = %#x/%#x/%#x.\n", func->bus, func->device, func->function);
	} else
		dbg("no acpi bridge for B/D/F = %#x/%#x/%#x.\n", func->bus, func->device, func->function);

	if (command != cmd) {
		rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
	}
	if ((card_type == PCI_HEADER_TYPE_BRIDGE) && (bcommand != bcmd)) {
		rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, bcommand);
	}
}
OpenPOWER on IntegriCloud