summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-integrator/pci_v3.c
blob: 604064b9d4ffc9a23d42d78efb32c4231fa9b33b (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
/*
 *  linux/arch/arm/mach-integrator/pci_v3.c
 *
 *  PCI functions for V3 host PCI bridge
 *
 *  Copyright (C) 1999 ARM Limited
 *  Copyright (C) 2000-2001 Deep Blue Solutions Ltd
 *
 * 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.  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>

#include <mach/hardware.h>
#include <mach/platform.h>
#include <mach/irqs.h>

#include <asm/signal.h>
#include <asm/mach/pci.h>
#include <asm/irq_regs.h>

/*
 * V3 Local Bus to PCI Bridge definitions
 *
 * Registers (these are taken from page 129 of the EPC User's Manual Rev 1.04
 * All V3 register names are prefaced by V3_ to avoid clashing with any other
 * PCI definitions.  Their names match the user's manual.
 *
 * I'm assuming that I20 is disabled.
 *
 */
#define V3_PCI_VENDOR                   0x00000000
#define V3_PCI_DEVICE                   0x00000002
#define V3_PCI_CMD                      0x00000004
#define V3_PCI_STAT                     0x00000006
#define V3_PCI_CC_REV                   0x00000008
#define V3_PCI_HDR_CFG                  0x0000000C
#define V3_PCI_IO_BASE                  0x00000010
#define V3_PCI_BASE0                    0x00000014
#define V3_PCI_BASE1                    0x00000018
#define V3_PCI_SUB_VENDOR               0x0000002C
#define V3_PCI_SUB_ID                   0x0000002E
#define V3_PCI_ROM                      0x00000030
#define V3_PCI_BPARAM                   0x0000003C
#define V3_PCI_MAP0                     0x00000040
#define V3_PCI_MAP1                     0x00000044
#define V3_PCI_INT_STAT                 0x00000048
#define V3_PCI_INT_CFG                  0x0000004C
#define V3_LB_BASE0                     0x00000054
#define V3_LB_BASE1                     0x00000058
#define V3_LB_MAP0                      0x0000005E
#define V3_LB_MAP1                      0x00000062
#define V3_LB_BASE2                     0x00000064
#define V3_LB_MAP2                      0x00000066
#define V3_LB_SIZE                      0x00000068
#define V3_LB_IO_BASE                   0x0000006E
#define V3_FIFO_CFG                     0x00000070
#define V3_FIFO_PRIORITY                0x00000072
#define V3_FIFO_STAT                    0x00000074
#define V3_LB_ISTAT                     0x00000076
#define V3_LB_IMASK                     0x00000077
#define V3_SYSTEM                       0x00000078
#define V3_LB_CFG                       0x0000007A
#define V3_PCI_CFG                      0x0000007C
#define V3_DMA_PCI_ADR0                 0x00000080
#define V3_DMA_PCI_ADR1                 0x00000090
#define V3_DMA_LOCAL_ADR0               0x00000084
#define V3_DMA_LOCAL_ADR1               0x00000094
#define V3_DMA_LENGTH0                  0x00000088
#define V3_DMA_LENGTH1                  0x00000098
#define V3_DMA_CSR0                     0x0000008B
#define V3_DMA_CSR1                     0x0000009B
#define V3_DMA_CTLB_ADR0                0x0000008C
#define V3_DMA_CTLB_ADR1                0x0000009C
#define V3_DMA_DELAY                    0x000000E0
#define V3_MAIL_DATA                    0x000000C0
#define V3_PCI_MAIL_IEWR                0x000000D0
#define V3_PCI_MAIL_IERD                0x000000D2
#define V3_LB_MAIL_IEWR                 0x000000D4
#define V3_LB_MAIL_IERD                 0x000000D6
#define V3_MAIL_WR_STAT                 0x000000D8
#define V3_MAIL_RD_STAT                 0x000000DA
#define V3_QBA_MAP                      0x000000DC

/*  PCI COMMAND REGISTER bits
 */
#define V3_COMMAND_M_FBB_EN             (1 << 9)
#define V3_COMMAND_M_SERR_EN            (1 << 8)
#define V3_COMMAND_M_PAR_EN             (1 << 6)
#define V3_COMMAND_M_MASTER_EN          (1 << 2)
#define V3_COMMAND_M_MEM_EN             (1 << 1)
#define V3_COMMAND_M_IO_EN              (1 << 0)

/*  SYSTEM REGISTER bits
 */
#define V3_SYSTEM_M_RST_OUT             (1 << 15)
#define V3_SYSTEM_M_LOCK                (1 << 14)

/*  PCI_CFG bits
 */
#define V3_PCI_CFG_M_I2O_EN		(1 << 15)
#define V3_PCI_CFG_M_IO_REG_DIS		(1 << 14)
#define V3_PCI_CFG_M_IO_DIS		(1 << 13)
#define V3_PCI_CFG_M_EN3V		(1 << 12)
#define V3_PCI_CFG_M_RETRY_EN           (1 << 10)
#define V3_PCI_CFG_M_AD_LOW1            (1 << 9)
#define V3_PCI_CFG_M_AD_LOW0            (1 << 8)

/*  PCI_BASE register bits (PCI -> Local Bus)
 */
#define V3_PCI_BASE_M_ADR_BASE          0xFFF00000
#define V3_PCI_BASE_M_ADR_BASEL         0x000FFF00
#define V3_PCI_BASE_M_PREFETCH          (1 << 3)
#define V3_PCI_BASE_M_TYPE              (3 << 1)
#define V3_PCI_BASE_M_IO                (1 << 0)

/*  PCI MAP register bits (PCI -> Local bus)
 */
#define V3_PCI_MAP_M_MAP_ADR            0xFFF00000
#define V3_PCI_MAP_M_RD_POST_INH        (1 << 15)
#define V3_PCI_MAP_M_ROM_SIZE           (3 << 10)
#define V3_PCI_MAP_M_SWAP               (3 << 8)
#define V3_PCI_MAP_M_ADR_SIZE           0x000000F0
#define V3_PCI_MAP_M_REG_EN             (1 << 1)
#define V3_PCI_MAP_M_ENABLE             (1 << 0)

/*
 *  LB_BASE0,1 register bits (Local bus -> PCI)
 */
#define V3_LB_BASE_ADR_BASE		0xfff00000
#define V3_LB_BASE_SWAP			(3 << 8)
#define V3_LB_BASE_ADR_SIZE		(15 << 4)
#define V3_LB_BASE_PREFETCH		(1 << 3)
#define V3_LB_BASE_ENABLE		(1 << 0)

#define V3_LB_BASE_ADR_SIZE_1MB		(0 << 4)
#define V3_LB_BASE_ADR_SIZE_2MB		(1 << 4)
#define V3_LB_BASE_ADR_SIZE_4MB		(2 << 4)
#define V3_LB_BASE_ADR_SIZE_8MB		(3 << 4)
#define V3_LB_BASE_ADR_SIZE_16MB	(4 << 4)
#define V3_LB_BASE_ADR_SIZE_32MB	(5 << 4)
#define V3_LB_BASE_ADR_SIZE_64MB	(6 << 4)
#define V3_LB_BASE_ADR_SIZE_128MB	(7 << 4)
#define V3_LB_BASE_ADR_SIZE_256MB	(8 << 4)
#define V3_LB_BASE_ADR_SIZE_512MB	(9 << 4)
#define V3_LB_BASE_ADR_SIZE_1GB		(10 << 4)
#define V3_LB_BASE_ADR_SIZE_2GB		(11 << 4)

#define v3_addr_to_lb_base(a)	((a) & V3_LB_BASE_ADR_BASE)

/*
 *  LB_MAP0,1 register bits (Local bus -> PCI)
 */
#define V3_LB_MAP_MAP_ADR		0xfff0
#define V3_LB_MAP_TYPE			(7 << 1)
#define V3_LB_MAP_AD_LOW_EN		(1 << 0)

#define V3_LB_MAP_TYPE_IACK		(0 << 1)
#define V3_LB_MAP_TYPE_IO		(1 << 1)
#define V3_LB_MAP_TYPE_MEM		(3 << 1)
#define V3_LB_MAP_TYPE_CONFIG		(5 << 1)
#define V3_LB_MAP_TYPE_MEM_MULTIPLE	(6 << 1)

#define v3_addr_to_lb_map(a)	(((a) >> 16) & V3_LB_MAP_MAP_ADR)

/*
 *  LB_BASE2 register bits (Local bus -> PCI IO)
 */
#define V3_LB_BASE2_ADR_BASE		0xff00
#define V3_LB_BASE2_SWAP		(3 << 6)
#define V3_LB_BASE2_ENABLE		(1 << 0)

#define v3_addr_to_lb_base2(a)	(((a) >> 16) & V3_LB_BASE2_ADR_BASE)

/*
 *  LB_MAP2 register bits (Local bus -> PCI IO)
 */
#define V3_LB_MAP2_MAP_ADR		0xff00

#define v3_addr_to_lb_map2(a)	(((a) >> 16) & V3_LB_MAP2_MAP_ADR)

/*
 * The V3 PCI interface chip in Integrator provides several windows from
 * local bus memory into the PCI memory areas.   Unfortunately, there
 * are not really enough windows for our usage, therefore we reuse
 * one of the windows for access to PCI configuration space.  The
 * memory map is as follows:
 *
 * Local Bus Memory         Usage
 *
 * 40000000 - 4FFFFFFF      PCI memory.  256M non-prefetchable
 * 50000000 - 5FFFFFFF      PCI memory.  256M prefetchable
 * 60000000 - 60FFFFFF      PCI IO.  16M
 * 61000000 - 61FFFFFF      PCI Configuration. 16M
 *
 * There are three V3 windows, each described by a pair of V3 registers.
 * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
 * Base0 and Base1 can be used for any type of PCI memory access.   Base2
 * can be used either for PCI I/O or for I20 accesses.  By default, uHAL
 * uses this only for PCI IO space.
 *
 * Normally these spaces are mapped using the following base registers:
 *
 * Usage Local Bus Memory         Base/Map registers used
 *
 * Mem   40000000 - 4FFFFFFF      LB_BASE0/LB_MAP0
 * Mem   50000000 - 5FFFFFFF      LB_BASE1/LB_MAP1
 * IO    60000000 - 60FFFFFF      LB_BASE2/LB_MAP2
 * Cfg   61000000 - 61FFFFFF
 *
 * This means that I20 and PCI configuration space accesses will fail.
 * When PCI configuration accesses are needed (via the uHAL PCI
 * configuration space primitives) we must remap the spaces as follows:
 *
 * Usage Local Bus Memory         Base/Map registers used
 *
 * Mem   40000000 - 4FFFFFFF      LB_BASE0/LB_MAP0
 * Mem   50000000 - 5FFFFFFF      LB_BASE0/LB_MAP0
 * IO    60000000 - 60FFFFFF      LB_BASE2/LB_MAP2
 * Cfg   61000000 - 61FFFFFF      LB_BASE1/LB_MAP1
 *
 * To make this work, the code depends on overlapping windows working.
 * The V3 chip translates an address by checking its range within
 * each of the BASE/MAP pairs in turn (in ascending register number
 * order).  It will use the first matching pair.   So, for example,
 * if the same address is mapped by both LB_BASE0/LB_MAP0 and
 * LB_BASE1/LB_MAP1, the V3 will use the translation from
 * LB_BASE0/LB_MAP0.
 *
 * To allow PCI Configuration space access, the code enlarges the
 * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M.  This occludes
 * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
 * be remapped for use by configuration cycles.
 *
 * At the end of the PCI Configuration space accesses,
 * LB_BASE1/LB_MAP1 is reset to map PCI Memory.  Finally the window
 * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
 * reveal the now restored LB_BASE1/LB_MAP1 window.
 *
 * NOTE: We do not set up I2O mapping.  I suspect that this is only
 * for an intelligent (target) device.  Using I2O disables most of
 * the mappings into PCI memory.
 */

// V3 access routines
#define v3_writeb(o,v) __raw_writeb(v, PCI_V3_VADDR + (unsigned int)(o))
#define v3_readb(o)    (__raw_readb(PCI_V3_VADDR + (unsigned int)(o)))

#define v3_writew(o,v) __raw_writew(v, PCI_V3_VADDR + (unsigned int)(o))
#define v3_readw(o)    (__raw_readw(PCI_V3_VADDR + (unsigned int)(o)))

#define v3_writel(o,v) __raw_writel(v, PCI_V3_VADDR + (unsigned int)(o))
#define v3_readl(o)    (__raw_readl(PCI_V3_VADDR + (unsigned int)(o)))

/*============================================================================
 *
 * routine:	uHALir_PCIMakeConfigAddress()
 *
 * parameters:	bus = which bus
 *              device = which device
 *              function = which function
 *		offset = configuration space register we are interested in
 *
 * description:	this routine will generate a platform dependent config
 *		address.
 *
 * calls:	none
 *
 * returns:	configuration address to play on the PCI bus
 *
 * To generate the appropriate PCI configuration cycles in the PCI
 * configuration address space, you present the V3 with the following pattern
 * (which is very nearly a type 1 (except that the lower two bits are 00 and
 * not 01).   In order for this mapping to work you need to set up one of
 * the local to PCI aperatures to 16Mbytes in length translating to
 * PCI configuration space starting at 0x0000.0000.
 *
 * PCI configuration cycles look like this:
 *
 * Type 0:
 *
 *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
 *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 *	31:11	Device select bit.
 * 	10:8	Function number
 * 	 7:2	Register number
 *
 * Type 1:
 *
 *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
 *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 *	31:24	reserved
 *	23:16	bus number (8 bits = 128 possible buses)
 *	15:11	Device number (5 bits)
 *	10:8	function number
 *	 7:2	register number
 *
 */
static DEFINE_RAW_SPINLOCK(v3_lock);

#define PCI_BUS_NONMEM_START	0x00000000
#define PCI_BUS_NONMEM_SIZE	SZ_256M

#define PCI_BUS_PREMEM_START	PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE
#define PCI_BUS_PREMEM_SIZE	SZ_256M

#if PCI_BUS_NONMEM_START & 0x000fffff
#error PCI_BUS_NONMEM_START must be megabyte aligned
#endif
#if PCI_BUS_PREMEM_START & 0x000fffff
#error PCI_BUS_PREMEM_START must be megabyte aligned
#endif

#undef V3_LB_BASE_PREFETCH
#define V3_LB_BASE_PREFETCH 0

static void __iomem *v3_open_config_window(struct pci_bus *bus,
					   unsigned int devfn, int offset)
{
	unsigned int address, mapaddress, busnr;

	busnr = bus->number;

	/*
	 * Trap out illegal values
	 */
	BUG_ON(offset > 255);
	BUG_ON(busnr > 255);
	BUG_ON(devfn > 255);

	if (busnr == 0) {
		int slot = PCI_SLOT(devfn);

		/*
		 * local bus segment so need a type 0 config cycle
		 *
		 * build the PCI configuration "address" with one-hot in
		 * A31-A11
		 *
		 * mapaddress:
		 *  3:1 = config cycle (101)
		 *  0   = PCI A1 & A0 are 0 (0)
		 */
		address = PCI_FUNC(devfn) << 8;
		mapaddress = V3_LB_MAP_TYPE_CONFIG;

		if (slot > 12)
			/*
			 * high order bits are handled by the MAP register
			 */
			mapaddress |= 1 << (slot - 5);
		else
			/*
			 * low order bits handled directly in the address
			 */
			address |= 1 << (slot + 11);
	} else {
        	/*
		 * not the local bus segment so need a type 1 config cycle
		 *
		 * address:
		 *  23:16 = bus number
		 *  15:11 = slot number (7:3 of devfn)
		 *  10:8  = func number (2:0 of devfn)
		 *
		 * mapaddress:
		 *  3:1 = config cycle (101)
		 *  0   = PCI A1 & A0 from host bus (1)
		 */
		mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN;
		address = (busnr << 16) | (devfn << 8);
	}

	/*
	 * Set up base0 to see all 512Mbytes of memory space (not
	 * prefetchable), this frees up base1 for re-use by
	 * configuration memory
	 */
	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
			V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE);

	/*
	 * Set up base1/map1 to point into configuration space.
	 */
	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_CONFIG_BASE) |
			V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE);
	v3_writew(V3_LB_MAP1, mapaddress);

	return PCI_CONFIG_VADDR + address + offset;
}

static void v3_close_config_window(void)
{
	/*
	 * Reassign base1 for use by prefetchable PCI memory
	 */
	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
			V3_LB_BASE_ENABLE);
	v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
			V3_LB_MAP_TYPE_MEM_MULTIPLE);

	/*
	 * And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
	 */
	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
}

static int v3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
			  int size, u32 *val)
{
	void __iomem *addr;
	unsigned long flags;
	u32 v;

	raw_spin_lock_irqsave(&v3_lock, flags);
	addr = v3_open_config_window(bus, devfn, where);

	switch (size) {
	case 1:
		v = __raw_readb(addr);
		break;

	case 2:
		v = __raw_readw(addr);
		break;

	default:
		v = __raw_readl(addr);
		break;
	}

	v3_close_config_window();
	raw_spin_unlock_irqrestore(&v3_lock, flags);

	*val = v;
	return PCIBIOS_SUCCESSFUL;
}

static int v3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
			   int size, u32 val)
{
	void __iomem *addr;
	unsigned long flags;

	raw_spin_lock_irqsave(&v3_lock, flags);
	addr = v3_open_config_window(bus, devfn, where);

	switch (size) {
	case 1:
		__raw_writeb((u8)val, addr);
		__raw_readb(addr);
		break;

	case 2:
		__raw_writew((u16)val, addr);
		__raw_readw(addr);
		break;

	case 4:
		__raw_writel(val, addr);
		__raw_readl(addr);
		break;
	}

	v3_close_config_window();
	raw_spin_unlock_irqrestore(&v3_lock, flags);

	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops pci_v3_ops = {
	.read	= v3_read_config,
	.write	= v3_write_config,
};

static struct resource non_mem = {
	.name	= "PCI non-prefetchable",
	.start	= PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START,
	.end	= PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE - 1,
	.flags	= IORESOURCE_MEM,
};

static struct resource pre_mem = {
	.name	= "PCI prefetchable",
	.start	= PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START,
	.end	= PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START + PCI_BUS_PREMEM_SIZE - 1,
	.flags	= IORESOURCE_MEM | IORESOURCE_PREFETCH,
};

static int __init pci_v3_setup_resources(struct pci_sys_data *sys)
{
	if (request_resource(&iomem_resource, &non_mem)) {
		printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
		       "memory region\n");
		return -EBUSY;
	}
	if (request_resource(&iomem_resource, &pre_mem)) {
		release_resource(&non_mem);
		printk(KERN_ERR "PCI: unable to allocate prefetchable "
		       "memory region\n");
		return -EBUSY;
	}

	/*
	 * the mem resource for this bus
	 * the prefetch mem resource for this bus
	 */
	pci_add_resource_offset(&sys->resources, &non_mem, sys->mem_offset);
	pci_add_resource_offset(&sys->resources, &pre_mem, sys->mem_offset);

	return 1;
}

/*
 * These don't seem to be implemented on the Integrator I have, which
 * means I can't get additional information on the reason for the pm2fb
 * problems.  I suppose I'll just have to mind-meld with the machine. ;)
 */
static void __iomem *ap_syscon_base;
#define INTEGRATOR_SC_PCIENABLE_OFFSET	0x18
#define INTEGRATOR_SC_LBFADDR_OFFSET	0x20
#define INTEGRATOR_SC_LBFCODE_OFFSET	0x24

static int
v3_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
	unsigned long pc = instruction_pointer(regs);
	unsigned long instr = *(unsigned long *)pc;
#if 0
	char buf[128];

	sprintf(buf, "V3 fault: addr 0x%08lx, FSR 0x%03x, PC 0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x ISTAT=%02x\n",
		addr, fsr, pc, instr, __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFADDR_OFFSET), __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFCODE_OFFSET) & 255,
		v3_readb(V3_LB_ISTAT));
	printk(KERN_DEBUG "%s", buf);
#endif

	v3_writeb(V3_LB_ISTAT, 0);
	__raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);

	/*
	 * If the instruction being executed was a read,
	 * make it look like it read all-ones.
	 */
	if ((instr & 0x0c100000) == 0x04100000) {
		int reg = (instr >> 12) & 15;
		unsigned long val;

		if (instr & 0x00400000)
			val = 255;
		else
			val = -1;

		regs->uregs[reg] = val;
		regs->ARM_pc += 4;
		return 0;
	}

	if ((instr & 0x0e100090) == 0x00100090) {
		int reg = (instr >> 12) & 15;

		regs->uregs[reg] = -1;
		regs->ARM_pc += 4;
		return 0;
	}

	return 1;
}

static irqreturn_t v3_irq(int dummy, void *devid)
{
#ifdef CONFIG_DEBUG_LL
	struct pt_regs *regs = get_irq_regs();
	unsigned long pc = instruction_pointer(regs);
	unsigned long instr = *(unsigned long *)pc;
	char buf[128];
	extern void printascii(const char *);

	sprintf(buf, "V3 int %d: pc=0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x "
		"ISTAT=%02x\n", IRQ_AP_V3INT, pc, instr,
		__raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFADDR_OFFSET),
		__raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFCODE_OFFSET) & 255,
		v3_readb(V3_LB_ISTAT));
	printascii(buf);
#endif

	v3_writew(V3_PCI_STAT, 0xf000);
	v3_writeb(V3_LB_ISTAT, 0);
	__raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);

#ifdef CONFIG_DEBUG_LL
	/*
	 * If the instruction being executed was a read,
	 * make it look like it read all-ones.
	 */
	if ((instr & 0x0c100000) == 0x04100000) {
		int reg = (instr >> 16) & 15;
		sprintf(buf, "   reg%d = %08lx\n", reg, regs->uregs[reg]);
		printascii(buf);
	}
#endif
	return IRQ_HANDLED;
}

static int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
{
	int ret = 0;

	if (!ap_syscon_base)
		return -EINVAL;

	if (nr == 0) {
		sys->mem_offset = PHYS_PCI_MEM_BASE;
		ret = pci_v3_setup_resources(sys);
	}

	return ret;
}

/*
 * V3_LB_BASE? - local bus address
 * V3_LB_MAP?  - pci bus address
 */
static void __init pci_v3_preinit(void)
{
	unsigned long flags;
	unsigned int temp;

	pcibios_min_mem = 0x00100000;

	/*
	 * Hook in our fault handler for PCI errors
	 */
	hook_fault_code(4, v3_pci_fault, SIGBUS, 0, "external abort on linefetch");
	hook_fault_code(6, v3_pci_fault, SIGBUS, 0, "external abort on linefetch");
	hook_fault_code(8, v3_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
	hook_fault_code(10, v3_pci_fault, SIGBUS, 0, "external abort on non-linefetch");

	raw_spin_lock_irqsave(&v3_lock, flags);

	/*
	 * Unlock V3 registers, but only if they were previously locked.
	 */
	if (v3_readw(V3_SYSTEM) & V3_SYSTEM_M_LOCK)
		v3_writew(V3_SYSTEM, 0xa05f);

	/*
	 * Setup window 0 - PCI non-prefetchable memory
	 *  Local: 0x40000000 Bus: 0x00000000 Size: 256MB
	 */
	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
	v3_writew(V3_LB_MAP0, v3_addr_to_lb_map(PCI_BUS_NONMEM_START) |
			V3_LB_MAP_TYPE_MEM);

	/*
	 * Setup window 1 - PCI prefetchable memory
	 *  Local: 0x50000000 Bus: 0x10000000 Size: 256MB
	 */
	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
			V3_LB_BASE_ENABLE);
	v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
			V3_LB_MAP_TYPE_MEM_MULTIPLE);

	/*
	 * Setup window 2 - PCI IO
	 */
	v3_writel(V3_LB_BASE2, v3_addr_to_lb_base2(PHYS_PCI_IO_BASE) |
			V3_LB_BASE_ENABLE);
	v3_writew(V3_LB_MAP2, v3_addr_to_lb_map2(0));

	/*
	 * Disable PCI to host IO cycles
	 */
	temp = v3_readw(V3_PCI_CFG) & ~V3_PCI_CFG_M_I2O_EN;
	temp |= V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS;
	v3_writew(V3_PCI_CFG, temp);

	printk(KERN_DEBUG "FIFO_CFG: %04x  FIFO_PRIO: %04x\n",
		v3_readw(V3_FIFO_CFG), v3_readw(V3_FIFO_PRIORITY));

	/*
	 * Set the V3 FIFO such that writes have higher priority than
	 * reads, and local bus write causes local bus read fifo flush.
	 * Same for PCI.
	 */
	v3_writew(V3_FIFO_PRIORITY, 0x0a0a);

	/*
	 * Re-lock the system register.
	 */
	temp = v3_readw(V3_SYSTEM) | V3_SYSTEM_M_LOCK;
	v3_writew(V3_SYSTEM, temp);

	/*
	 * Clear any error conditions, and enable write errors.
	 */
	v3_writeb(V3_LB_ISTAT, 0);
	v3_writew(V3_LB_CFG, v3_readw(V3_LB_CFG) | (1 << 10));
	v3_writeb(V3_LB_IMASK, 0x28);
	__raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);

	raw_spin_unlock_irqrestore(&v3_lock, flags);
}

static void __init pci_v3_postinit(void)
{
	unsigned int pci_cmd;

	pci_cmd = PCI_COMMAND_MEMORY |
		  PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;

	v3_writew(V3_PCI_CMD, pci_cmd);

	v3_writeb(V3_LB_ISTAT, ~0x40);
	v3_writeb(V3_LB_IMASK, 0x68);

#if 0
	ret = request_irq(IRQ_AP_LBUSTIMEOUT, lb_timeout, 0, "bus timeout", NULL);
	if (ret)
		printk(KERN_ERR "PCI: unable to grab local bus timeout "
		       "interrupt: %d\n", ret);
#endif

	register_isa_ports(PHYS_PCI_MEM_BASE, PHYS_PCI_IO_BASE, 0);
}

/*
 * A small note about bridges and interrupts.  The DECchip 21050 (and
 * later) adheres to the PCI-PCI bridge specification.  This says that
 * the interrupts on the other side of a bridge are swizzled in the
 * following manner:
 *
 * Dev    Interrupt   Interrupt
 *        Pin on      Pin on
 *        Device      Connector
 *
 *   4    A           A
 *        B           B
 *        C           C
 *        D           D
 *
 *   5    A           B
 *        B           C
 *        C           D
 *        D           A
 *
 *   6    A           C
 *        B           D
 *        C           A
 *        D           B
 *
 *   7    A           D
 *        B           A
 *        C           B
 *        D           C
 *
 * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
 * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
 */

/*
 * This routine handles multiple bridges.
 */
static u8 __init pci_v3_swizzle(struct pci_dev *dev, u8 *pinp)
{
	if (*pinp == 0)
		*pinp = 1;

	return pci_common_swizzle(dev, pinp);
}

static int irq_tab[4] __initdata = {
	IRQ_AP_PCIINT0,	IRQ_AP_PCIINT1,	IRQ_AP_PCIINT2,	IRQ_AP_PCIINT3
};

/*
 * map the specified device/slot/pin to an IRQ.  This works out such
 * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
 */
static int __init pci_v3_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
	int intnr = ((slot - 9) + (pin - 1)) & 3;

	return irq_tab[intnr];
}

static struct hw_pci pci_v3 __initdata = {
	.swizzle		= pci_v3_swizzle,
	.map_irq		= pci_v3_map_irq,
	.setup			= pci_v3_setup,
	.nr_controllers		= 1,
	.ops			= &pci_v3_ops,
	.preinit		= pci_v3_preinit,
	.postinit		= pci_v3_postinit,
};

static int __init pci_v3_probe(struct platform_device *pdev)
{
	int ret;

	/* Remap the Integrator system controller */
	ap_syscon_base = ioremap(INTEGRATOR_SC_BASE, 0x100);
	if (!ap_syscon_base) {
		dev_err(&pdev->dev, "unable to remap the AP syscon for PCIv3\n");
		return -ENODEV;
	}

	ret = devm_request_irq(&pdev->dev, IRQ_AP_V3INT, v3_irq, 0, "V3", NULL);
	if (ret) {
		dev_err(&pdev->dev, "unable to grab PCI error interrupt: %d\n",
			ret);
		return -ENODEV;
	}

	pci_common_init(&pci_v3);

	return 0;
}

static struct platform_driver pci_v3_driver = {
	.driver = {
		.name = "pci-v3",
	},
};

static int __init pci_v3_init(void)
{
	return platform_driver_probe(&pci_v3_driver, pci_v3_probe);
}

subsys_initcall(pci_v3_init);
OpenPOWER on IntegriCloud