summaryrefslogtreecommitdiffstats
path: root/drivers/ps3/vuart.c
blob: ef8fd4c308757d34efc524d276055aeaaa4c653b (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
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
/*
 *  PS3 virtual uart
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 *
 *  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; version 2 of the License.
 *
 *  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/module.h>
#include <linux/interrupt.h>
#include <asm/ps3.h>

#include <asm/lv1call.h>
#include <asm/bitops.h>

#include "vuart.h"

MODULE_AUTHOR("Sony Corporation");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ps3 vuart");

/**
 * vuart - An inter-partition data link service.
 *  port 0: PS3 AV Settings.
 *  port 2: PS3 System Manager.
 *
 * The vuart provides a bi-directional byte stream data link between logical
 * partitions.  Its primary role is as a communications link between the guest
 * OS and the system policy module.  The current HV does not support any
 * connections other than those listed.
 */

enum {PORT_COUNT = 3,};

enum vuart_param {
	PARAM_TX_TRIGGER = 0,
	PARAM_RX_TRIGGER = 1,
	PARAM_INTERRUPT_MASK = 2,
	PARAM_RX_BUF_SIZE = 3, /* read only */
	PARAM_RX_BYTES = 4, /* read only */
	PARAM_TX_BUF_SIZE = 5, /* read only */
	PARAM_TX_BYTES = 6, /* read only */
	PARAM_INTERRUPT_STATUS = 7, /* read only */
};

enum vuart_interrupt_bit {
	INTERRUPT_BIT_TX = 0,
	INTERRUPT_BIT_RX = 1,
	INTERRUPT_BIT_DISCONNECT = 2,
};

enum vuart_interrupt_mask {
	INTERRUPT_MASK_TX = 1,
	INTERRUPT_MASK_RX = 2,
	INTERRUPT_MASK_DISCONNECT = 4,
};

/**
 * struct ports_bmp - bitmap indicating ports needing service.
 *
 * A 256 bit read only bitmap indicating ports needing service.  Do not write
 * to these bits.  Must not cross a page boundary.
 */

struct ports_bmp {
	u64 status;
	u64 unused[3];
} __attribute__ ((aligned (32)));

/* redefine dev_dbg to do a syntax check */

#if !defined(DEBUG)
#undef dev_dbg
static inline int __attribute__ ((format (printf, 2, 3))) dev_dbg(
	const struct device *_dev, const char *fmt, ...) {return 0;}
#endif

#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
static void __attribute__ ((unused)) _dump_ports_bmp(
	const struct ports_bmp* bmp, const char* func, int line)
{
	pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
}

static int ps3_vuart_match_id_to_port(enum ps3_match_id match_id,
	unsigned int *port_number)
{
	switch(match_id) {
	case PS3_MATCH_ID_AV_SETTINGS:
		*port_number = 0;
		return 0;
	case PS3_MATCH_ID_SYSTEM_MANAGER:
		*port_number = 2;
		return 0;
	default:
		WARN_ON(1);
		*port_number = UINT_MAX;
		return -EINVAL;
	};
}

#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
static void __attribute__ ((unused)) _dump_port_params(unsigned int port_number,
	const char* func, int line)
{
#if defined(DEBUG)
	static const char *strings[] = {
		"tx_trigger      ",
		"rx_trigger      ",
		"interrupt_mask  ",
		"rx_buf_size     ",
		"rx_bytes        ",
		"tx_buf_size     ",
		"tx_bytes        ",
		"interrupt_status",
	};
	int result;
	unsigned int i;
	u64 value;

	for (i = 0; i < ARRAY_SIZE(strings); i++) {
		result = lv1_get_virtual_uart_param(port_number, i, &value);

		if (result) {
			pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
				port_number, strings[i], ps3_result(result));
			continue;
		}
		pr_debug("%s:%d: port_%u: %s = %lxh\n",
			func, line, port_number, strings[i], value);
	}
#endif
}

struct vuart_triggers {
	unsigned long rx;
	unsigned long tx;
};

int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
	struct vuart_triggers *trig)
{
	int result;
	unsigned long size;
	unsigned long val;

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_TX_TRIGGER, &trig->tx);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_BUF_SIZE, &size);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_TRIGGER, &val);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	trig->rx = size - val;

	dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
		trig->tx, trig->rx);

	return result;
}

int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
	unsigned int rx)
{
	int result;
	unsigned long size;

	result = lv1_set_virtual_uart_param(dev->port_number,
		PARAM_TX_TRIGGER, tx);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_BUF_SIZE, &size);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_set_virtual_uart_param(dev->port_number,
		PARAM_RX_TRIGGER, size - rx);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
		tx, rx);

	return result;
}

static int ps3_vuart_get_rx_bytes_waiting(struct ps3_vuart_port_device *dev,
	unsigned long *bytes_waiting)
{
	int result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_BYTES, bytes_waiting);

	if (result)
		dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__,
		*bytes_waiting);
	return result;
}

static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev,
	unsigned long mask)
{
	int result;

	dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);

	dev->interrupt_mask = mask;

	result = lv1_set_virtual_uart_param(dev->port_number,
		PARAM_INTERRUPT_MASK, dev->interrupt_mask);

	if (result)
		dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	return result;
}

static int ps3_vuart_get_interrupt_mask(struct ps3_vuart_port_device *dev,
	unsigned long *status)
{
	int result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_INTERRUPT_STATUS, status);

	if (result)
		dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
		__func__, __LINE__, dev->interrupt_mask, *status,
		dev->interrupt_mask & *status);

	return result;
}

int ps3_vuart_enable_interrupt_tx(struct ps3_vuart_port_device *dev)
{
	return (dev->interrupt_mask & INTERRUPT_MASK_TX) ? 0
		: ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
		| INTERRUPT_MASK_TX);
}

int ps3_vuart_enable_interrupt_rx(struct ps3_vuart_port_device *dev)
{
	return (dev->interrupt_mask & INTERRUPT_MASK_RX) ? 0
		: ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
		| INTERRUPT_MASK_RX);
}

int ps3_vuart_enable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
{
	return (dev->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
		: ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
		| INTERRUPT_MASK_DISCONNECT);
}

int ps3_vuart_disable_interrupt_tx(struct ps3_vuart_port_device *dev)
{
	return (dev->interrupt_mask & INTERRUPT_MASK_TX)
		? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
		& ~INTERRUPT_MASK_TX) : 0;
}

int ps3_vuart_disable_interrupt_rx(struct ps3_vuart_port_device *dev)
{
	return (dev->interrupt_mask & INTERRUPT_MASK_RX)
		? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
		& ~INTERRUPT_MASK_RX) : 0;
}

int ps3_vuart_disable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
{
	return (dev->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
		? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
		& ~INTERRUPT_MASK_DISCONNECT) : 0;
}

/**
 * ps3_vuart_raw_write - Low level write helper.
 *
 * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
 */

static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev,
	const void* buf, unsigned int bytes, unsigned long *bytes_written)
{
	int result;

	dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);

	result = lv1_write_virtual_uart(dev->port_number,
		ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
			"%s\n", __func__, __LINE__, ps3_result(result));
		return result;
	}

	dev->stats.bytes_written += *bytes_written;

	dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__,
		__LINE__, *bytes_written, bytes, dev->stats.bytes_written);

	return result;
}

/**
 * ps3_vuart_raw_read - Low level read helper.
 *
 * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
 */

static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf,
	unsigned int bytes, unsigned long *bytes_read)
{
	int result;

	dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);

	result = lv1_read_virtual_uart(dev->port_number,
		ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	dev->stats.bytes_read += *bytes_read;

	dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
		*bytes_read, bytes, dev->stats.bytes_read);

	return result;
}

/**
 * struct list_buffer - An element for a port device fifo buffer list.
 */

struct list_buffer {
	struct list_head link;
	const unsigned char *head;
	const unsigned char *tail;
	unsigned long dbg_number;
	unsigned char data[];
};

/**
 * ps3_vuart_write - the entry point for writing data to a port
 *
 * If the port is idle on entry as much of the incoming data is written to
 * the port as the port will accept.  Otherwise a list buffer is created
 * and any remaning incoming data is copied to that buffer.  The buffer is
 * then enqueued for transmision via the transmit interrupt.
 */

int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
	unsigned int bytes)
{
	static unsigned long dbg_number;
	int result;
	unsigned long flags;
	struct list_buffer *lb;

	dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
		bytes, bytes);

	spin_lock_irqsave(&dev->tx_list.lock, flags);

	if (list_empty(&dev->tx_list.head)) {
		unsigned long bytes_written;

		result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);

		spin_unlock_irqrestore(&dev->tx_list.lock, flags);

		if (result) {
			dev_dbg(&dev->core,
				"%s:%d: ps3_vuart_raw_write failed\n",
				__func__, __LINE__);
			return result;
		}

		if (bytes_written == bytes) {
			dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
				__func__, __LINE__, bytes);
			return 0;
		}

		bytes -= bytes_written;
		buf += bytes_written;
	} else
		spin_unlock_irqrestore(&dev->tx_list.lock, flags);

	lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);

	if (!lb) {
		return -ENOMEM;
	}

	memcpy(lb->data, buf, bytes);
	lb->head = lb->data;
	lb->tail = lb->data + bytes;
	lb->dbg_number = ++dbg_number;

	spin_lock_irqsave(&dev->tx_list.lock, flags);
	list_add_tail(&lb->link, &dev->tx_list.head);
	ps3_vuart_enable_interrupt_tx(dev);
	spin_unlock_irqrestore(&dev->tx_list.lock, flags);

	dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
		__func__, __LINE__, lb->dbg_number, bytes);

	return 0;
}

/**
 * ps3_vuart_read - the entry point for reading data from a port
 *
 * If enough bytes to satisfy the request are held in the buffer list those
 * bytes are dequeued and copied to the caller's buffer.  Emptied list buffers
 * are retiered.  If the request cannot be statified by bytes held in the list
 * buffers -EAGAIN is returned.
 */

int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
	unsigned int bytes)
{
	unsigned long flags;
	struct list_buffer *lb, *n;
	unsigned long bytes_read;

	dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
		bytes, bytes);

	spin_lock_irqsave(&dev->rx_list.lock, flags);

	if (dev->rx_list.bytes_held < bytes) {
		spin_unlock_irqrestore(&dev->rx_list.lock, flags);
		dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
			__func__, __LINE__, bytes - dev->rx_list.bytes_held);
		return -EAGAIN;
	}

	list_for_each_entry_safe(lb, n, &dev->rx_list.head, link) {
		bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);

		memcpy(buf, lb->head, bytes_read);
		buf += bytes_read;
		bytes -= bytes_read;
		dev->rx_list.bytes_held -= bytes_read;

		if (bytes_read < lb->tail - lb->head) {
			lb->head += bytes_read;
			spin_unlock_irqrestore(&dev->rx_list.lock, flags);

			dev_dbg(&dev->core,
				"%s:%d: dequeued buf_%lu, %lxh bytes\n",
				__func__, __LINE__, lb->dbg_number, bytes_read);
			return 0;
		}

		dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
			lb->dbg_number);

		list_del(&lb->link);
		kfree(lb);
	}
	spin_unlock_irqrestore(&dev->rx_list.lock, flags);

	dev_dbg(&dev->core, "%s:%d: dequeued buf_%lu, %xh bytes\n",
		__func__, __LINE__, lb->dbg_number, bytes);

	return 0;
}

/**
 * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
 *
 * Services the transmit interrupt for the port.  Writes as much data from the
 * buffer list as the port will accept.  Retires any emptied list buffers and
 * adjusts the final list buffer state for a partial write.
 */

static int ps3_vuart_handle_interrupt_tx(struct ps3_vuart_port_device *dev)
{
	int result = 0;
	unsigned long flags;
	struct list_buffer *lb, *n;
	unsigned long bytes_total = 0;

	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);

	spin_lock_irqsave(&dev->tx_list.lock, flags);

	list_for_each_entry_safe(lb, n, &dev->tx_list.head, link) {

		unsigned long bytes_written;

		result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
			&bytes_written);

		if (result) {
			dev_dbg(&dev->core,
				"%s:%d: ps3_vuart_raw_write failed\n",
				__func__, __LINE__);
			break;
		}

		bytes_total += bytes_written;

		if (bytes_written < lb->tail - lb->head) {
			lb->head += bytes_written;
			dev_dbg(&dev->core,
				"%s:%d cleared buf_%lu, %lxh bytes\n",
				__func__, __LINE__, lb->dbg_number,
				bytes_written);
			goto port_full;
		}

		dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
			lb->dbg_number);

		list_del(&lb->link);
		kfree(lb);
	}

	ps3_vuart_disable_interrupt_tx(dev);
port_full:
	spin_unlock_irqrestore(&dev->tx_list.lock, flags);
	dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
		__func__, __LINE__, bytes_total);
	return result;
}

/**
 * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
 *
 * Services the receive interrupt for the port.  Creates a list buffer and
 * copies all waiting port data to that buffer and enqueues the buffer in the
 * buffer list.  Buffer list data is dequeued via ps3_vuart_read.
 */

static int ps3_vuart_handle_interrupt_rx(struct ps3_vuart_port_device *dev)
{
	static unsigned long dbg_number;
	int result = 0;
	unsigned long flags;
	struct list_buffer *lb;
	unsigned long bytes;

	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);

	result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);

	if (result)
		return -EIO;

	BUG_ON(!bytes);

	/* add some extra space for recently arrived data */

	bytes += 128;

	lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);

	if (!lb)
		return -ENOMEM;

	ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);

	lb->head = lb->data;
	lb->tail = lb->data + bytes;
	lb->dbg_number = ++dbg_number;

	spin_lock_irqsave(&dev->rx_list.lock, flags);
	list_add_tail(&lb->link, &dev->rx_list.head);
	dev->rx_list.bytes_held += bytes;
	spin_unlock_irqrestore(&dev->rx_list.lock, flags);

	dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %lxh bytes\n",
		__func__, __LINE__, lb->dbg_number, bytes);

	return 0;
}

static int ps3_vuart_handle_interrupt_disconnect(
	struct ps3_vuart_port_device *dev)
{
	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
	BUG_ON("no support");
	return -1;
}

/**
 * ps3_vuart_handle_port_interrupt - second stage interrupt handler
 *
 * Services any pending interrupt types for the port.  Passes control to the
 * third stage type specific interrupt handler.  Returns control to the first
 * stage handler after one iteration.
 */

static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev)
{
	int result;
	unsigned long status;

	result = ps3_vuart_get_interrupt_mask(dev, &status);

	if (result)
		return result;

	dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
		status);

	if (status & INTERRUPT_MASK_DISCONNECT) {
		dev->stats.disconnect_interrupts++;
		result = ps3_vuart_handle_interrupt_disconnect(dev);
		if (result)
			ps3_vuart_disable_interrupt_disconnect(dev);
	}

	if (status & INTERRUPT_MASK_TX) {
		dev->stats.tx_interrupts++;
		result = ps3_vuart_handle_interrupt_tx(dev);
		if (result)
			ps3_vuart_disable_interrupt_tx(dev);
	}

	if (status & INTERRUPT_MASK_RX) {
		dev->stats.rx_interrupts++;
		result = ps3_vuart_handle_interrupt_rx(dev);
		if (result)
			ps3_vuart_disable_interrupt_rx(dev);
	}

	return 0;
}

struct vuart_private {
	unsigned int in_use;
	unsigned int virq;
	struct ps3_vuart_port_device *devices[PORT_COUNT];
	const struct ports_bmp bmp;
};

/**
 * ps3_vuart_irq_handler - first stage interrupt handler
 *
 * Loops finding any interrupting port and its associated instance data.
 * Passes control to the second stage port specific interrupt handler.  Loops
 * until all outstanding interrupts are serviced.
 */

static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
{
	struct vuart_private *private;

	BUG_ON(!_private);
	private = (struct vuart_private *)_private;

	while (1) {
		unsigned int port;

		dump_ports_bmp(&private->bmp);

		port = (BITS_PER_LONG - 1) - __ilog2(private->bmp.status);

		if (port == BITS_PER_LONG)
			break;

		BUG_ON(port >= PORT_COUNT);
		BUG_ON(!private->devices[port]);

		ps3_vuart_handle_port_interrupt(private->devices[port]);
	}

	return IRQ_HANDLED;
}

static int ps3_vuart_match(struct device *_dev, struct device_driver *_drv)
{
	int result;
	struct ps3_vuart_port_driver *drv = to_ps3_vuart_port_driver(_drv);
	struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);

	result = dev->match_id == drv->match_id;

	dev_info(&dev->core, "%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__,
		__LINE__, dev->match_id, dev->core.bus_id, drv->match_id,
		drv->core.name, (result ? "match" : "miss"));

	return result;
}

static struct vuart_private vuart_private;

static int ps3_vuart_probe(struct device *_dev)
{
	int result;
	unsigned long tmp;
	struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
	struct ps3_vuart_port_driver *drv =
		to_ps3_vuart_port_driver(_dev->driver);

	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);

	BUG_ON(!drv);

	result = ps3_vuart_match_id_to_port(dev->match_id, &dev->port_number);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: unknown match_id (%d)\n",
			__func__, __LINE__, dev->match_id);
		result = -EINVAL;
		goto fail_match;
	}

	if (vuart_private.devices[dev->port_number]) {
		dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
			__LINE__, dev->port_number);
		result = -EBUSY;
		goto fail_match;
	}

	vuart_private.devices[dev->port_number] = dev;

	INIT_LIST_HEAD(&dev->tx_list.head);
	spin_lock_init(&dev->tx_list.lock);
	INIT_LIST_HEAD(&dev->rx_list.head);
	spin_lock_init(&dev->rx_list.lock);

	vuart_private.in_use++;
	if (vuart_private.in_use == 1) {
		result = ps3_alloc_vuart_irq(PS3_BINDING_CPU_ANY,
			(void*)&vuart_private.bmp.status, &vuart_private.virq);

		if (result) {
			dev_dbg(&dev->core,
				"%s:%d: ps3_alloc_vuart_irq failed (%d)\n",
				__func__, __LINE__, result);
			result = -EPERM;
			goto fail_alloc_irq;
		}

		result = request_irq(vuart_private.virq, ps3_vuart_irq_handler,
			IRQF_DISABLED, "vuart", &vuart_private);

		if (result) {
			dev_info(&dev->core, "%s:%d: request_irq failed (%d)\n",
				__func__, __LINE__, result);
			goto fail_request_irq;
		}
	}

	ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);

	/* clear stale pending interrupts */
	ps3_vuart_get_interrupt_mask(dev, &tmp);

	ps3_vuart_set_triggers(dev, 1, 1);

	if (drv->probe)
		result = drv->probe(dev);
	else {
		result = 0;
		dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
			__LINE__);
	}

	if (result) {
		dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
			__func__, __LINE__);
		goto fail_probe;
	}

	return result;

fail_probe:
fail_request_irq:
	vuart_private.in_use--;
	if (!vuart_private.in_use) {
		ps3_free_vuart_irq(vuart_private.virq);
		vuart_private.virq = NO_IRQ;
	}
fail_alloc_irq:
fail_match:
	dev_dbg(&dev->core, "%s:%d failed\n", __func__, __LINE__);
	return result;
}

static int ps3_vuart_remove(struct device *_dev)
{
	struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
	struct ps3_vuart_port_driver *drv =
		to_ps3_vuart_port_driver(_dev->driver);

	dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
		dev->core.bus_id);

	BUG_ON(vuart_private.in_use < 1);

	if (drv->remove)
		drv->remove(dev);
	else
		dev_dbg(&dev->core, "%s:%d: %s no remove method\n", __func__,
			__LINE__, dev->core.bus_id);

	vuart_private.in_use--;

	if (!vuart_private.in_use) {
		free_irq(vuart_private.virq, &vuart_private);
		ps3_free_vuart_irq(vuart_private.virq);
		vuart_private.virq = NO_IRQ;
	}
	return 0;
}

static void ps3_vuart_shutdown(struct device *_dev)
{
	struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
	struct ps3_vuart_port_driver *drv =
		to_ps3_vuart_port_driver(_dev->driver);

	dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
		dev->core.bus_id);

	if (drv->shutdown)
		drv->shutdown(dev);
	else
		dev_dbg(&dev->core, "%s:%d: %s no shutdown method\n", __func__,
			__LINE__, dev->core.bus_id);
}

/**
 * ps3_vuart - The vuart instance.
 *
 * The vuart is managed as a bus that port devices connect to.
 */

struct bus_type ps3_vuart = {
        .name = "ps3_vuart",
	.match = ps3_vuart_match,
	.probe = ps3_vuart_probe,
	.remove = ps3_vuart_remove,
	.shutdown = ps3_vuart_shutdown,
};

int __init ps3_vuart_init(void)
{
	int result;

	pr_debug("%s:%d:\n", __func__, __LINE__);
	result = bus_register(&ps3_vuart);
	BUG_ON(result);
	return result;
}

void __exit ps3_vuart_exit(void)
{
	pr_debug("%s:%d:\n", __func__, __LINE__);
	bus_unregister(&ps3_vuart);
}

core_initcall(ps3_vuart_init);
module_exit(ps3_vuart_exit);

/**
 * ps3_vuart_port_release_device - Remove a vuart port device.
 */

static void ps3_vuart_port_release_device(struct device *_dev)
{
	struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
#if defined(DEBUG)
	memset(dev, 0xad, sizeof(struct ps3_vuart_port_device));
#endif
	kfree(dev);
}

/**
 * ps3_vuart_port_device_register - Add a vuart port device.
 */

int ps3_vuart_port_device_register(struct ps3_vuart_port_device *dev)
{
	int result;
	static unsigned int dev_count = 1;

	dev->core.parent = NULL;
	dev->core.bus = &ps3_vuart;
	dev->core.release = ps3_vuart_port_release_device;

	snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "vuart_%02x",
		dev_count++);

	dev_dbg(&dev->core, "%s:%d register\n", __func__, __LINE__);

	result = device_register(&dev->core);

	return result;
}

EXPORT_SYMBOL_GPL(ps3_vuart_port_device_register);

/**
 * ps3_vuart_port_driver_register - Add a vuart port device driver.
 */

int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
{
	int result;

	pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
	drv->core.bus = &ps3_vuart;
	result = driver_register(&drv->core);
	return result;
}

EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);

/**
 * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
 */

void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
{
	driver_unregister(&drv->core);
}

EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);
OpenPOWER on IntegriCloud