summaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/ppc85xx_rio.c
blob: 297f3b549177096d8f421ab836394fb324968f72 (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
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
/*
 * MPC85xx RapidIO support
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * 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.
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>

#include <asm/io.h>

#define RIO_REGS_BASE		(CCSRBAR + 0xc0000)
#define RIO_ATMU_REGS_OFFSET	0x10c00
#define RIO_MSG_REGS_OFFSET	0x11000
#define RIO_MAINT_WIN_SIZE	0x400000
#define RIO_DBELL_WIN_SIZE	0x1000

#define RIO_MSG_OMR_MUI		0x00000002
#define RIO_MSG_OSR_TE		0x00000080
#define RIO_MSG_OSR_QOI		0x00000020
#define RIO_MSG_OSR_QFI		0x00000010
#define RIO_MSG_OSR_MUB		0x00000004
#define RIO_MSG_OSR_EOMI	0x00000002
#define RIO_MSG_OSR_QEI		0x00000001

#define RIO_MSG_IMR_MI		0x00000002
#define RIO_MSG_ISR_TE		0x00000080
#define RIO_MSG_ISR_QFI		0x00000010
#define RIO_MSG_ISR_DIQI	0x00000001

#define RIO_MSG_DESC_SIZE	32
#define RIO_MSG_BUFFER_SIZE	4096
#define RIO_MIN_TX_RING_SIZE	2
#define RIO_MAX_TX_RING_SIZE	2048
#define RIO_MIN_RX_RING_SIZE	2
#define RIO_MAX_RX_RING_SIZE	2048

#define DOORBELL_DMR_DI		0x00000002
#define DOORBELL_DSR_TE		0x00000080
#define DOORBELL_DSR_QFI	0x00000010
#define DOORBELL_DSR_DIQI	0x00000001
#define DOORBELL_TID_OFFSET	0x03
#define DOORBELL_SID_OFFSET	0x05
#define DOORBELL_INFO_OFFSET	0x06

#define DOORBELL_MESSAGE_SIZE	0x08
#define DBELL_SID(x)		(*(u8 *)(x + DOORBELL_SID_OFFSET))
#define DBELL_TID(x)		(*(u8 *)(x + DOORBELL_TID_OFFSET))
#define DBELL_INF(x)		(*(u16 *)(x + DOORBELL_INFO_OFFSET))

#define is_power_of_2(x)	(((x) & ((x) - 1)) == 0)

struct rio_atmu_regs {
	u32 rowtar;
	u32 pad1;
	u32 rowbar;
	u32 pad2;
	u32 rowar;
	u32 pad3[3];
};

struct rio_msg_regs {
	u32 omr;
	u32 osr;
	u32 pad1;
	u32 odqdpar;
	u32 pad2;
	u32 osar;
	u32 odpr;
	u32 odatr;
	u32 odcr;
	u32 pad3;
	u32 odqepar;
	u32 pad4[13];
	u32 imr;
	u32 isr;
	u32 pad5;
	u32 ifqdpar;
	u32 pad6;
	u32 ifqepar;
	u32 pad7[250];
	u32 dmr;
	u32 dsr;
	u32 pad8;
	u32 dqdpar;
	u32 pad9;
	u32 dqepar;
	u32 pad10[26];
	u32 pwmr;
	u32 pwsr;
	u32 pad11;
	u32 pwqbar;
};

struct rio_tx_desc {
	u32 res1;
	u32 saddr;
	u32 dport;
	u32 dattr;
	u32 res2;
	u32 res3;
	u32 dwcnt;
	u32 res4;
};

static u32 regs_win;
static struct rio_atmu_regs *atmu_regs;
static struct rio_atmu_regs *maint_atmu_regs;
static struct rio_atmu_regs *dbell_atmu_regs;
static u32 dbell_win;
static u32 maint_win;
static struct rio_msg_regs *msg_regs;

static struct rio_dbell_ring {
	void *virt;
	dma_addr_t phys;
} dbell_ring;

static struct rio_msg_tx_ring {
	void *virt;
	dma_addr_t phys;
	void *virt_buffer[RIO_MAX_TX_RING_SIZE];
	dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
	int tx_slot;
	int size;
	void *dev_id;
} msg_tx_ring;

static struct rio_msg_rx_ring {
	void *virt;
	dma_addr_t phys;
	void *virt_buffer[RIO_MAX_RX_RING_SIZE];
	int rx_slot;
	int size;
	void *dev_id;
} msg_rx_ring;

/**
 * mpc85xx_rio_doorbell_send - Send a MPC85xx doorbell message
 * @index: ID of RapidIO interface
 * @destid: Destination ID of target device
 * @data: 16-bit info field of RapidIO doorbell message
 *
 * Sends a MPC85xx doorbell message. Returns %0 on success or
 * %-EINVAL on failure.
 */
static int mpc85xx_rio_doorbell_send(int index, u16 destid, u16 data)
{
	pr_debug("mpc85xx_doorbell_send: index %d destid %4.4x data %4.4x\n",
		 index, destid, data);
	out_be32((void *)&dbell_atmu_regs->rowtar, destid << 22);
	out_be16((void *)(dbell_win), data);

	return 0;
}

/**
 * mpc85xx_local_config_read - Generate a MPC85xx local config space read
 * @index: ID of RapdiIO interface
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @data: Value to be read into
 *
 * Generates a MPC85xx local configuration space read. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int mpc85xx_local_config_read(int index, u32 offset, int len, u32 * data)
{
	pr_debug("mpc85xx_local_config_read: index %d offset %8.8x\n", index,
		 offset);
	*data = in_be32((void *)(regs_win + offset));

	return 0;
}

/**
 * mpc85xx_local_config_write - Generate a MPC85xx local config space write
 * @index: ID of RapdiIO interface
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @data: Value to be written
 *
 * Generates a MPC85xx local configuration space write. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int mpc85xx_local_config_write(int index, u32 offset, int len, u32 data)
{
	pr_debug
	    ("mpc85xx_local_config_write: index %d offset %8.8x data %8.8x\n",
	     index, offset, data);
	out_be32((void *)(regs_win + offset), data);

	return 0;
}

/**
 * mpc85xx_rio_config_read - Generate a MPC85xx read maintenance transaction
 * @index: ID of RapdiIO interface
 * @destid: Destination ID of transaction
 * @hopcount: Number of hops to target device
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @val: Location to be read into
 *
 * Generates a MPC85xx read maintenance transaction. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int
mpc85xx_rio_config_read(int index, u16 destid, u8 hopcount, u32 offset, int len,
			u32 * val)
{
	u8 *data;

	pr_debug
	    ("mpc85xx_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
	     index, destid, hopcount, offset, len);
	out_be32((void *)&maint_atmu_regs->rowtar,
		 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));

	data = (u8 *) maint_win + offset;
	switch (len) {
	case 1:
		*val = in_8((u8 *) data);
		break;
	case 2:
		*val = in_be16((u16 *) data);
		break;
	default:
		*val = in_be32((u32 *) data);
		break;
	}

	return 0;
}

/**
 * mpc85xx_rio_config_write - Generate a MPC85xx write maintenance transaction
 * @index: ID of RapdiIO interface
 * @destid: Destination ID of transaction
 * @hopcount: Number of hops to target device
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @val: Value to be written
 *
 * Generates an MPC85xx write maintenance transaction. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int
mpc85xx_rio_config_write(int index, u16 destid, u8 hopcount, u32 offset,
			 int len, u32 val)
{
	u8 *data;
	pr_debug
	    ("mpc85xx_rio_config_write: index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
	     index, destid, hopcount, offset, len, val);
	out_be32((void *)&maint_atmu_regs->rowtar,
		 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));

	data = (u8 *) maint_win + offset;
	switch (len) {
	case 1:
		out_8((u8 *) data, val);
		break;
	case 2:
		out_be16((u16 *) data, val);
		break;
	default:
		out_be32((u32 *) data, val);
		break;
	}

	return 0;
}

/**
 * rio_hw_add_outb_message - Add message to the MPC85xx outbound message queue
 * @mport: Master port with outbound message queue
 * @rdev: Target of outbound message
 * @mbox: Outbound mailbox
 * @buffer: Message to add to outbound queue
 * @len: Length of message
 *
 * Adds the @buffer message to the MPC85xx outbound message queue. Returns
 * %0 on success or %-EINVAL on failure.
 */
int
rio_hw_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
			void *buffer, size_t len)
{
	u32 omr;
	struct rio_tx_desc *desc =
	    (struct rio_tx_desc *)msg_tx_ring.virt + msg_tx_ring.tx_slot;
	int ret = 0;

	pr_debug
	    ("RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n",
	     rdev->destid, mbox, (int)buffer, len);

	if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
		ret = -EINVAL;
		goto out;
	}

	/* Copy and clear rest of buffer */
	memcpy(msg_tx_ring.virt_buffer[msg_tx_ring.tx_slot], buffer, len);
	if (len < (RIO_MAX_MSG_SIZE - 4))
		memset((void *)((u32) msg_tx_ring.
				virt_buffer[msg_tx_ring.tx_slot] + len), 0,
		       RIO_MAX_MSG_SIZE - len);

	/* Set mbox field for message */
	desc->dport = mbox & 0x3;

	/* Enable EOMI interrupt, set priority, and set destid */
	desc->dattr = 0x28000000 | (rdev->destid << 2);

	/* Set transfer size aligned to next power of 2 (in double words) */
	desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);

	/* Set snooping and source buffer address */
	desc->saddr = 0x00000004 | msg_tx_ring.phys_buffer[msg_tx_ring.tx_slot];

	/* Increment enqueue pointer */
	omr = in_be32((void *)&msg_regs->omr);
	out_be32((void *)&msg_regs->omr, omr | RIO_MSG_OMR_MUI);

	/* Go to next descriptor */
	if (++msg_tx_ring.tx_slot == msg_tx_ring.size)
		msg_tx_ring.tx_slot = 0;

      out:
	return ret;
}

EXPORT_SYMBOL_GPL(rio_hw_add_outb_message);

/**
 * mpc85xx_rio_tx_handler - MPC85xx outbound message interrupt handler
 * @irq: Linux interrupt number
 * @dev_instance: Pointer to interrupt-specific data
 * @regs: Register context
 *
 * Handles outbound message interrupts. Executes a register outbound
 * mailbox event handler and acks the interrupt occurence.
 */
static irqreturn_t
mpc85xx_rio_tx_handler(int irq, void *dev_instance, struct pt_regs *regs)
{
	int osr;
	struct rio_mport *port = (struct rio_mport *)dev_instance;

	osr = in_be32((void *)&msg_regs->osr);

	if (osr & RIO_MSG_OSR_TE) {
		pr_info("RIO: outbound message transmission error\n");
		out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_TE);
		goto out;
	}

	if (osr & RIO_MSG_OSR_QOI) {
		pr_info("RIO: outbound message queue overflow\n");
		out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_QOI);
		goto out;
	}

	if (osr & RIO_MSG_OSR_EOMI) {
		u32 dqp = in_be32((void *)&msg_regs->odqdpar);
		int slot = (dqp - msg_tx_ring.phys) >> 5;
		port->outb_msg[0].mcback(port, msg_tx_ring.dev_id, -1, slot);

		/* Ack the end-of-message interrupt */
		out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_EOMI);
	}

      out:
	return IRQ_HANDLED;
}

/**
 * rio_open_outb_mbox - Initialize MPC85xx outbound mailbox
 * @mport: Master port implementing the outbound message unit
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox to open
 * @entries: Number of entries in the outbound mailbox ring
 *
 * Initializes buffer ring, request the outbound message interrupt,
 * and enables the outbound message unit. Returns %0 on success and
 * %-EINVAL or %-ENOMEM on failure.
 */
int rio_open_outb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
{
	int i, j, rc = 0;

	if ((entries < RIO_MIN_TX_RING_SIZE) ||
	    (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
		rc = -EINVAL;
		goto out;
	}

	/* Initialize shadow copy ring */
	msg_tx_ring.dev_id = dev_id;
	msg_tx_ring.size = entries;

	for (i = 0; i < msg_tx_ring.size; i++) {
		if (!
		    (msg_tx_ring.virt_buffer[i] =
		     dma_alloc_coherent(NULL, RIO_MSG_BUFFER_SIZE,
					&msg_tx_ring.phys_buffer[i],
					GFP_KERNEL))) {
			rc = -ENOMEM;
			for (j = 0; j < msg_tx_ring.size; j++)
				if (msg_tx_ring.virt_buffer[j])
					dma_free_coherent(NULL,
							  RIO_MSG_BUFFER_SIZE,
							  msg_tx_ring.
							  virt_buffer[j],
							  msg_tx_ring.
							  phys_buffer[j]);
			goto out;
		}
	}

	/* Initialize outbound message descriptor ring */
	if (!(msg_tx_ring.virt = dma_alloc_coherent(NULL,
						    msg_tx_ring.size *
						    RIO_MSG_DESC_SIZE,
						    &msg_tx_ring.phys,
						    GFP_KERNEL))) {
		rc = -ENOMEM;
		goto out_dma;
	}
	memset(msg_tx_ring.virt, 0, msg_tx_ring.size * RIO_MSG_DESC_SIZE);
	msg_tx_ring.tx_slot = 0;

	/* Point dequeue/enqueue pointers at first entry in ring */
	out_be32((void *)&msg_regs->odqdpar, msg_tx_ring.phys);
	out_be32((void *)&msg_regs->odqepar, msg_tx_ring.phys);

	/* Configure for snooping */
	out_be32((void *)&msg_regs->osar, 0x00000004);

	/* Clear interrupt status */
	out_be32((void *)&msg_regs->osr, 0x000000b3);

	/* Hook up outbound message handler */
	if ((rc =
	     request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0,
			 "msg_tx", (void *)mport)) < 0)
		goto out_irq;

	/*
	 * Configure outbound message unit
	 *      Snooping
	 *      Interrupts (all enabled, except QEIE)
	 *      Chaining mode
	 *      Disable
	 */
	out_be32((void *)&msg_regs->omr, 0x00100220);

	/* Set number of entries */
	out_be32((void *)&msg_regs->omr,
		 in_be32((void *)&msg_regs->omr) |
		 ((get_bitmask_order(entries) - 2) << 12));

	/* Now enable the unit */
	out_be32((void *)&msg_regs->omr, in_be32((void *)&msg_regs->omr) | 0x1);

      out:
	return rc;

      out_irq:
	dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
			  msg_tx_ring.virt, msg_tx_ring.phys);

      out_dma:
	for (i = 0; i < msg_tx_ring.size; i++)
		dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
				  msg_tx_ring.virt_buffer[i],
				  msg_tx_ring.phys_buffer[i]);

	return rc;
}

/**
 * rio_close_outb_mbox - Shut down MPC85xx outbound mailbox
 * @mport: Master port implementing the outbound message unit
 * @mbox: Mailbox to close
 *
 * Disables the outbound message unit, free all buffers, and
 * frees the outbound message interrupt.
 */
void rio_close_outb_mbox(struct rio_mport *mport, int mbox)
{
	/* Disable inbound message unit */
	out_be32((void *)&msg_regs->omr, 0);

	/* Free ring */
	dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
			  msg_tx_ring.virt, msg_tx_ring.phys);

	/* Free interrupt */
	free_irq(MPC85xx_IRQ_RIO_TX, (void *)mport);
}

/**
 * mpc85xx_rio_rx_handler - MPC85xx inbound message interrupt handler
 * @irq: Linux interrupt number
 * @dev_instance: Pointer to interrupt-specific data
 * @regs: Register context
 *
 * Handles inbound message interrupts. Executes a registered inbound
 * mailbox event handler and acks the interrupt occurence.
 */
static irqreturn_t
mpc85xx_rio_rx_handler(int irq, void *dev_instance, struct pt_regs *regs)
{
	int isr;
	struct rio_mport *port = (struct rio_mport *)dev_instance;

	isr = in_be32((void *)&msg_regs->isr);

	if (isr & RIO_MSG_ISR_TE) {
		pr_info("RIO: inbound message reception error\n");
		out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_TE);
		goto out;
	}

	/* XXX Need to check/dispatch until queue empty */
	if (isr & RIO_MSG_ISR_DIQI) {
		/*
		 * We implement *only* mailbox 0, but can receive messages
		 * for any mailbox/letter to that mailbox destination. So,
		 * make the callback with an unknown/invalid mailbox number
		 * argument.
		 */
		port->inb_msg[0].mcback(port, msg_rx_ring.dev_id, -1, -1);

		/* Ack the queueing interrupt */
		out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_DIQI);
	}

      out:
	return IRQ_HANDLED;
}

/**
 * rio_open_inb_mbox - Initialize MPC85xx inbound mailbox
 * @mport: Master port implementing the inbound message unit
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox to open
 * @entries: Number of entries in the inbound mailbox ring
 *
 * Initializes buffer ring, request the inbound message interrupt,
 * and enables the inbound message unit. Returns %0 on success
 * and %-EINVAL or %-ENOMEM on failure.
 */
int rio_open_inb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
{
	int i, rc = 0;

	if ((entries < RIO_MIN_RX_RING_SIZE) ||
	    (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
		rc = -EINVAL;
		goto out;
	}

	/* Initialize client buffer ring */
	msg_rx_ring.dev_id = dev_id;
	msg_rx_ring.size = entries;
	msg_rx_ring.rx_slot = 0;
	for (i = 0; i < msg_rx_ring.size; i++)
		msg_rx_ring.virt_buffer[i] = NULL;

	/* Initialize inbound message ring */
	if (!(msg_rx_ring.virt = dma_alloc_coherent(NULL,
						    msg_rx_ring.size *
						    RIO_MAX_MSG_SIZE,
						    &msg_rx_ring.phys,
						    GFP_KERNEL))) {
		rc = -ENOMEM;
		goto out;
	}

	/* Point dequeue/enqueue pointers at first entry in ring */
	out_be32((void *)&msg_regs->ifqdpar, (u32) msg_rx_ring.phys);
	out_be32((void *)&msg_regs->ifqepar, (u32) msg_rx_ring.phys);

	/* Clear interrupt status */
	out_be32((void *)&msg_regs->isr, 0x00000091);

	/* Hook up inbound message handler */
	if ((rc =
	     request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0,
			 "msg_rx", (void *)mport)) < 0) {
		dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
				  msg_tx_ring.virt_buffer[i],
				  msg_tx_ring.phys_buffer[i]);
		goto out;
	}

	/*
	 * Configure inbound message unit:
	 *      Snooping
	 *      4KB max message size
	 *      Unmask all interrupt sources
	 *      Disable
	 */
	out_be32((void *)&msg_regs->imr, 0x001b0060);

	/* Set number of queue entries */
	out_be32((void *)&msg_regs->imr,
		 in_be32((void *)&msg_regs->imr) |
		 ((get_bitmask_order(entries) - 2) << 12));

	/* Now enable the unit */
	out_be32((void *)&msg_regs->imr, in_be32((void *)&msg_regs->imr) | 0x1);

      out:
	return rc;
}

/**
 * rio_close_inb_mbox - Shut down MPC85xx inbound mailbox
 * @mport: Master port implementing the inbound message unit
 * @mbox: Mailbox to close
 *
 * Disables the inbound message unit, free all buffers, and
 * frees the inbound message interrupt.
 */
void rio_close_inb_mbox(struct rio_mport *mport, int mbox)
{
	/* Disable inbound message unit */
	out_be32((void *)&msg_regs->imr, 0);

	/* Free ring */
	dma_free_coherent(NULL, msg_rx_ring.size * RIO_MAX_MSG_SIZE,
			  msg_rx_ring.virt, msg_rx_ring.phys);

	/* Free interrupt */
	free_irq(MPC85xx_IRQ_RIO_RX, (void *)mport);
}

/**
 * rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
 * @mport: Master port implementing the inbound message unit
 * @mbox: Inbound mailbox number
 * @buf: Buffer to add to inbound queue
 *
 * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
 * %0 on success or %-EINVAL on failure.
 */
int rio_hw_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
{
	int rc = 0;

	pr_debug("RIO: rio_hw_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
		 msg_rx_ring.rx_slot);

	if (msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot]) {
		printk(KERN_ERR
		       "RIO: error adding inbound buffer %d, buffer exists\n",
		       msg_rx_ring.rx_slot);
		rc = -EINVAL;
		goto out;
	}

	msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot] = buf;
	if (++msg_rx_ring.rx_slot == msg_rx_ring.size)
		msg_rx_ring.rx_slot = 0;

      out:
	return rc;
}

EXPORT_SYMBOL_GPL(rio_hw_add_inb_buffer);

/**
 * rio_hw_get_inb_message - Fetch inbound message from the MPC85xx message unit
 * @mport: Master port implementing the inbound message unit
 * @mbox: Inbound mailbox number
 *
 * Gets the next available inbound message from the inbound message queue.
 * A pointer to the message is returned on success or NULL on failure.
 */
void *rio_hw_get_inb_message(struct rio_mport *mport, int mbox)
{
	u32 imr;
	u32 phys_buf, virt_buf;
	void *buf = NULL;
	int buf_idx;

	phys_buf = in_be32((void *)&msg_regs->ifqdpar);

	/* If no more messages, then bail out */
	if (phys_buf == in_be32((void *)&msg_regs->ifqepar))
		goto out2;

	virt_buf = (u32) msg_rx_ring.virt + (phys_buf - msg_rx_ring.phys);
	buf_idx = (phys_buf - msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
	buf = msg_rx_ring.virt_buffer[buf_idx];

	if (!buf) {
		printk(KERN_ERR
		       "RIO: inbound message copy failed, no buffers\n");
		goto out1;
	}

	/* Copy max message size, caller is expected to allocate that big */
	memcpy(buf, (void *)virt_buf, RIO_MAX_MSG_SIZE);

	/* Clear the available buffer */
	msg_rx_ring.virt_buffer[buf_idx] = NULL;

      out1:
	imr = in_be32((void *)&msg_regs->imr);
	out_be32((void *)&msg_regs->imr, imr | RIO_MSG_IMR_MI);

      out2:
	return buf;
}

EXPORT_SYMBOL_GPL(rio_hw_get_inb_message);

/**
 * mpc85xx_rio_dbell_handler - MPC85xx doorbell interrupt handler
 * @irq: Linux interrupt number
 * @dev_instance: Pointer to interrupt-specific data
 * @regs: Register context
 *
 * Handles doorbell interrupts. Parses a list of registered
 * doorbell event handlers and executes a matching event handler.
 */
static irqreturn_t
mpc85xx_rio_dbell_handler(int irq, void *dev_instance, struct pt_regs *regs)
{
	int dsr;
	struct rio_mport *port = (struct rio_mport *)dev_instance;

	dsr = in_be32((void *)&msg_regs->dsr);

	if (dsr & DOORBELL_DSR_TE) {
		pr_info("RIO: doorbell reception error\n");
		out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_TE);
		goto out;
	}

	if (dsr & DOORBELL_DSR_QFI) {
		pr_info("RIO: doorbell queue full\n");
		out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_QFI);
		goto out;
	}

	/* XXX Need to check/dispatch until queue empty */
	if (dsr & DOORBELL_DSR_DIQI) {
		u32 dmsg =
		    (u32) dbell_ring.virt +
		    (in_be32((void *)&msg_regs->dqdpar) & 0xfff);
		u32 dmr;
		struct rio_dbell *dbell;
		int found = 0;

		pr_debug
		    ("RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
		     DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));

		list_for_each_entry(dbell, &port->dbells, node) {
			if ((dbell->res->start <= DBELL_INF(dmsg)) &&
			    (dbell->res->end >= DBELL_INF(dmsg))) {
				found = 1;
				break;
			}
		}
		if (found) {
			dbell->dinb(port, dbell->dev_id, DBELL_SID(dmsg), DBELL_TID(dmsg),
				    DBELL_INF(dmsg));
		} else {
			pr_debug
			    ("RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
			     DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
		}
		dmr = in_be32((void *)&msg_regs->dmr);
		out_be32((void *)&msg_regs->dmr, dmr | DOORBELL_DMR_DI);
		out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_DIQI);
	}

      out:
	return IRQ_HANDLED;
}

/**
 * mpc85xx_rio_doorbell_init - MPC85xx doorbell interface init
 * @mport: Master port implementing the inbound doorbell unit
 *
 * Initializes doorbell unit hardware and inbound DMA buffer
 * ring. Called from mpc85xx_rio_setup(). Returns %0 on success
 * or %-ENOMEM on failure.
 */
static int mpc85xx_rio_doorbell_init(struct rio_mport *mport)
{
	int rc = 0;

	/* Map outbound doorbell window immediately after maintenance window */
	if (!(dbell_win =
	      (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
			    RIO_DBELL_WIN_SIZE))) {
		printk(KERN_ERR
		       "RIO: unable to map outbound doorbell window\n");
		rc = -ENOMEM;
		goto out;
	}

	/* Initialize inbound doorbells */
	if (!(dbell_ring.virt = dma_alloc_coherent(NULL,
						   512 * DOORBELL_MESSAGE_SIZE,
						   &dbell_ring.phys,
						   GFP_KERNEL))) {
		printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
		rc = -ENOMEM;
		iounmap((void *)dbell_win);
		goto out;
	}

	/* Point dequeue/enqueue pointers at first entry in ring */
	out_be32((void *)&msg_regs->dqdpar, (u32) dbell_ring.phys);
	out_be32((void *)&msg_regs->dqepar, (u32) dbell_ring.phys);

	/* Clear interrupt status */
	out_be32((void *)&msg_regs->dsr, 0x00000091);

	/* Hook up doorbell handler */
	if ((rc =
	     request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0,
			 "dbell_rx", (void *)mport) < 0)) {
		iounmap((void *)dbell_win);
		dma_free_coherent(NULL, 512 * DOORBELL_MESSAGE_SIZE,
				  dbell_ring.virt, dbell_ring.phys);
		printk(KERN_ERR
		       "MPC85xx RIO: unable to request inbound doorbell irq");
		goto out;
	}

	/* Configure doorbells for snooping, 512 entries, and enable */
	out_be32((void *)&msg_regs->dmr, 0x00108161);

      out:
	return rc;
}

static char *cmdline = NULL;

static int mpc85xx_rio_get_hdid(int index)
{
	/* XXX Need to parse multiple entries in some format */
	if (!cmdline)
		return -1;

	return simple_strtol(cmdline, NULL, 0);
}

static int mpc85xx_rio_get_cmdline(char *s)
{
	if (!s)
		return 0;

	cmdline = s;
	return 1;
}

__setup("riohdid=", mpc85xx_rio_get_cmdline);

/**
 * mpc85xx_rio_setup - Setup MPC85xx RapidIO interface
 * @law_start: Starting physical address of RapidIO LAW
 * @law_size: Size of RapidIO LAW
 *
 * Initializes MPC85xx RapidIO hardware interface, configures
 * master port with system-specific info, and registers the
 * master port with the RapidIO subsystem.
 */
void mpc85xx_rio_setup(int law_start, int law_size)
{
	struct rio_ops *ops;
	struct rio_mport *port;

	ops = kmalloc(sizeof(struct rio_ops), GFP_KERNEL);
	ops->lcread = mpc85xx_local_config_read;
	ops->lcwrite = mpc85xx_local_config_write;
	ops->cread = mpc85xx_rio_config_read;
	ops->cwrite = mpc85xx_rio_config_write;
	ops->dsend = mpc85xx_rio_doorbell_send;

	port = kmalloc(sizeof(struct rio_mport), GFP_KERNEL);
	port->id = 0;
	port->index = 0;
	INIT_LIST_HEAD(&port->dbells);
	port->iores.start = law_start;
	port->iores.end = law_start + law_size;
	port->iores.flags = IORESOURCE_MEM;

	rio_init_dbell_res(&port->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
	rio_init_mbox_res(&port->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
	rio_init_mbox_res(&port->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
	strcpy(port->name, "RIO0 mport");

	port->ops = ops;
	port->host_deviceid = mpc85xx_rio_get_hdid(port->id);

	rio_register_mport(port);

	regs_win = (u32) ioremap(RIO_REGS_BASE, 0x20000);
	atmu_regs = (struct rio_atmu_regs *)(regs_win + RIO_ATMU_REGS_OFFSET);
	maint_atmu_regs = atmu_regs + 1;
	dbell_atmu_regs = atmu_regs + 2;
	msg_regs = (struct rio_msg_regs *)(regs_win + RIO_MSG_REGS_OFFSET);

	/* Configure maintenance transaction window */
	out_be32((void *)&maint_atmu_regs->rowbar, 0x000c0000);
	out_be32((void *)&maint_atmu_regs->rowar, 0x80077015);

	maint_win = (u32) ioremap(law_start, RIO_MAINT_WIN_SIZE);

	/* Configure outbound doorbell window */
	out_be32((void *)&dbell_atmu_regs->rowbar, 0x000c0400);
	out_be32((void *)&dbell_atmu_regs->rowar, 0x8004200b);
	mpc85xx_rio_doorbell_init(port);
}
OpenPOWER on IntegriCloud