summaryrefslogtreecommitdiffstats
path: root/drivers/net/irda/pxaficp_ir.c
blob: 964b116a0ab79ad79120c4d537cdb5701e000152 (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
/*
 * linux/drivers/net/irda/pxaficp_ir.c
 *
 * Based on sa1100_ir.c by Russell King
 *
 * Changes copyright (C) 2003-2005 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Infra-red driver (SIR/FIR) for the PXA2xx embedded microprocessor
 *
 */
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/slab.h>

#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>

#include <mach/dma.h>
#include <linux/platform_data/irda-pxaficp.h>
#include <mach/regs-ost.h>
#include <mach/regs-uart.h>

#define FICP		__REG(0x40800000)  /* Start of FICP area */
#define ICCR0		__REG(0x40800000)  /* ICP Control Register 0 */
#define ICCR1		__REG(0x40800004)  /* ICP Control Register 1 */
#define ICCR2		__REG(0x40800008)  /* ICP Control Register 2 */
#define ICDR		__REG(0x4080000c)  /* ICP Data Register */
#define ICSR0		__REG(0x40800014)  /* ICP Status Register 0 */
#define ICSR1		__REG(0x40800018)  /* ICP Status Register 1 */

#define ICCR0_AME	(1 << 7)	/* Address match enable */
#define ICCR0_TIE	(1 << 6)	/* Transmit FIFO interrupt enable */
#define ICCR0_RIE	(1 << 5)	/* Receive FIFO interrupt enable */
#define ICCR0_RXE	(1 << 4)	/* Receive enable */
#define ICCR0_TXE	(1 << 3)	/* Transmit enable */
#define ICCR0_TUS	(1 << 2)	/* Transmit FIFO underrun select */
#define ICCR0_LBM	(1 << 1)	/* Loopback mode */
#define ICCR0_ITR	(1 << 0)	/* IrDA transmission */

#define ICCR2_RXP       (1 << 3)	/* Receive Pin Polarity select */
#define ICCR2_TXP       (1 << 2)	/* Transmit Pin Polarity select */
#define ICCR2_TRIG	(3 << 0)	/* Receive FIFO Trigger threshold */
#define ICCR2_TRIG_8    (0 << 0)	/* 	>= 8 bytes */
#define ICCR2_TRIG_16   (1 << 0)	/*	>= 16 bytes */
#define ICCR2_TRIG_32   (2 << 0)	/*	>= 32 bytes */

#ifdef CONFIG_PXA27x
#define ICSR0_EOC	(1 << 6)	/* DMA End of Descriptor Chain */
#endif
#define ICSR0_FRE	(1 << 5)	/* Framing error */
#define ICSR0_RFS	(1 << 4)	/* Receive FIFO service request */
#define ICSR0_TFS	(1 << 3)	/* Transnit FIFO service request */
#define ICSR0_RAB	(1 << 2)	/* Receiver abort */
#define ICSR0_TUR	(1 << 1)	/* Trunsmit FIFO underun */
#define ICSR0_EIF	(1 << 0)	/* End/Error in FIFO */

#define ICSR1_ROR	(1 << 6)	/* Receiver FIFO underrun  */
#define ICSR1_CRE	(1 << 5)	/* CRC error */
#define ICSR1_EOF	(1 << 4)	/* End of frame */
#define ICSR1_TNF	(1 << 3)	/* Transmit FIFO not full */
#define ICSR1_RNE	(1 << 2)	/* Receive FIFO not empty */
#define ICSR1_TBY	(1 << 1)	/* Tramsmiter busy flag */
#define ICSR1_RSY	(1 << 0)	/* Recevier synchronized flag */

#define IrSR_RXPL_NEG_IS_ZERO (1<<4)
#define IrSR_RXPL_POS_IS_ZERO 0x0
#define IrSR_TXPL_NEG_IS_ZERO (1<<3)
#define IrSR_TXPL_POS_IS_ZERO 0x0
#define IrSR_XMODE_PULSE_1_6  (1<<2)
#define IrSR_XMODE_PULSE_3_16 0x0
#define IrSR_RCVEIR_IR_MODE   (1<<1)
#define IrSR_RCVEIR_UART_MODE 0x0
#define IrSR_XMITIR_IR_MODE   (1<<0)
#define IrSR_XMITIR_UART_MODE 0x0

#define IrSR_IR_RECEIVE_ON (\
                IrSR_RXPL_NEG_IS_ZERO | \
                IrSR_TXPL_POS_IS_ZERO | \
                IrSR_XMODE_PULSE_3_16 | \
                IrSR_RCVEIR_IR_MODE   | \
                IrSR_XMITIR_UART_MODE)

#define IrSR_IR_TRANSMIT_ON (\
                IrSR_RXPL_NEG_IS_ZERO | \
                IrSR_TXPL_POS_IS_ZERO | \
                IrSR_XMODE_PULSE_3_16 | \
                IrSR_RCVEIR_UART_MODE | \
                IrSR_XMITIR_IR_MODE)

struct pxa_irda {
	int			speed;
	int			newspeed;
	unsigned long		last_oscr;

	unsigned char		*dma_rx_buff;
	unsigned char		*dma_tx_buff;
	dma_addr_t		dma_rx_buff_phy;
	dma_addr_t		dma_tx_buff_phy;
	unsigned int		dma_tx_buff_len;
	int			txdma;
	int			rxdma;

	int			uart_irq;
	int			icp_irq;

	struct irlap_cb		*irlap;
	struct qos_info		qos;

	iobuff_t		tx_buff;
	iobuff_t		rx_buff;

	struct device		*dev;
	struct pxaficp_platform_data *pdata;
	struct clk		*fir_clk;
	struct clk		*sir_clk;
	struct clk		*cur_clk;
};

static inline void pxa_irda_disable_clk(struct pxa_irda *si)
{
	if (si->cur_clk)
		clk_disable_unprepare(si->cur_clk);
	si->cur_clk = NULL;
}

static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
{
	si->cur_clk = si->fir_clk;
	clk_prepare_enable(si->fir_clk);
}

static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
{
	si->cur_clk = si->sir_clk;
	clk_prepare_enable(si->sir_clk);
}


#define IS_FIR(si)		((si)->speed >= 4000000)
#define IRDA_FRAME_SIZE_LIMIT	2047

inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
{
	DCSR(si->rxdma)  = DCSR_NODESC;
	DSADR(si->rxdma) = __PREG(ICDR);
	DTADR(si->rxdma) = si->dma_rx_buff_phy;
	DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC |  DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
	DCSR(si->rxdma) |= DCSR_RUN;
}

inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
{
	DCSR(si->txdma)  = DCSR_NODESC;
	DSADR(si->txdma) = si->dma_tx_buff_phy;
	DTADR(si->txdma) = __PREG(ICDR);
	DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG |  DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
	DCSR(si->txdma) |= DCSR_RUN;
}

/*
 * Set the IrDA communications mode.
 */
static void pxa_irda_set_mode(struct pxa_irda *si, int mode)
{
	if (si->pdata->transceiver_mode)
		si->pdata->transceiver_mode(si->dev, mode);
	else {
		if (gpio_is_valid(si->pdata->gpio_pwdown))
			gpio_set_value(si->pdata->gpio_pwdown,
					!(mode & IR_OFF) ^
					!si->pdata->gpio_pwdown_inverted);
		pxa2xx_transceiver_mode(si->dev, mode);
	}
}

/*
 * Set the IrDA communications speed.
 */
static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
{
	unsigned long flags;
	unsigned int divisor;

	switch (speed) {
	case 9600:	case 19200:	case 38400:
	case 57600:	case 115200:

		/* refer to PXA250/210 Developer's Manual 10-7 */
		/*  BaudRate = 14.7456 MHz / (16*Divisor) */
		divisor = 14745600 / (16 * speed);

		local_irq_save(flags);

		if (IS_FIR(si)) {
			/* stop RX DMA */
			DCSR(si->rxdma) &= ~DCSR_RUN;
			/* disable FICP */
			ICCR0 = 0;
			pxa_irda_disable_clk(si);

			/* set board transceiver to SIR mode */
			pxa_irda_set_mode(si, IR_SIRMODE);

			/* enable the STUART clock */
			pxa_irda_enable_sirclk(si);
		}

		/* disable STUART first */
		STIER = 0;

		/* access DLL & DLH */
		STLCR |= LCR_DLAB;
		STDLL = divisor & 0xff;
		STDLH = divisor >> 8;
		STLCR &= ~LCR_DLAB;

		si->speed = speed;
		STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
		STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;

		local_irq_restore(flags);
		break;

	case 4000000:
		local_irq_save(flags);

		/* disable STUART */
		STIER = 0;
		STISR = 0;
		pxa_irda_disable_clk(si);

		/* disable FICP first */
		ICCR0 = 0;

		/* set board transceiver to FIR mode */
		pxa_irda_set_mode(si, IR_FIRMODE);

		/* enable the FICP clock */
		pxa_irda_enable_firclk(si);

		si->speed = speed;
		pxa_irda_fir_dma_rx_start(si);
		ICCR0 = ICCR0_ITR | ICCR0_RXE;

		local_irq_restore(flags);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

/* SIR interrupt service routine. */
static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct pxa_irda *si = netdev_priv(dev);
	int iir, lsr, data;

	iir = STIIR;

	switch  (iir & 0x0F) {
	case 0x06: /* Receiver Line Status */
	  	lsr = STLSR;
		while (lsr & LSR_FIFOE) {
			data = STRBR;
			if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
				printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
				dev->stats.rx_errors++;
				if (lsr & LSR_FE)
					dev->stats.rx_frame_errors++;
				if (lsr & LSR_OE)
					dev->stats.rx_fifo_errors++;
			} else {
				dev->stats.rx_bytes++;
				async_unwrap_char(dev, &dev->stats,
						  &si->rx_buff, data);
			}
			lsr = STLSR;
		}
		si->last_oscr = readl_relaxed(OSCR);
		break;

	case 0x04: /* Received Data Available */
	  	   /* forth through */

	case 0x0C: /* Character Timeout Indication */
	  	do  {
		    dev->stats.rx_bytes++;
	            async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
	  	} while (STLSR & LSR_DR);
		si->last_oscr = readl_relaxed(OSCR);
	  	break;

	case 0x02: /* Transmit FIFO Data Request */
	    	while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
	    		STTHR = *si->tx_buff.data++;
			si->tx_buff.len -= 1;
	    	}

		if (si->tx_buff.len == 0) {
			dev->stats.tx_packets++;
			dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;

                        /* We need to ensure that the transmitter has finished. */
			while ((STLSR & LSR_TEMT) == 0)
				cpu_relax();
			si->last_oscr = readl_relaxed(OSCR);

			/*
		 	* Ok, we've finished transmitting.  Now enable
		 	* the receiver.  Sometimes we get a receive IRQ
		 	* immediately after a transmit...
		 	*/
			if (si->newspeed) {
				pxa_irda_set_speed(si, si->newspeed);
				si->newspeed = 0;
			} else {
				/* enable IR Receiver, disable IR Transmitter */
				STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
				/* enable STUART and receive interrupts */
				STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
			}
			/* I'm hungry! */
			netif_wake_queue(dev);
		}
		break;
	}

	return IRQ_HANDLED;
}

/* FIR Receive DMA interrupt handler */
static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
{
	int dcsr = DCSR(channel);

	DCSR(channel) = dcsr & ~DCSR_RUN;

	printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
}

/* FIR Transmit DMA interrupt handler */
static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
{
	struct net_device *dev = data;
	struct pxa_irda *si = netdev_priv(dev);
	int dcsr;

	dcsr = DCSR(channel);
	DCSR(channel) = dcsr & ~DCSR_RUN;

	if (dcsr & DCSR_ENDINTR)  {
		dev->stats.tx_packets++;
		dev->stats.tx_bytes += si->dma_tx_buff_len;
	} else {
		dev->stats.tx_errors++;
	}

	while (ICSR1 & ICSR1_TBY)
		cpu_relax();
	si->last_oscr = readl_relaxed(OSCR);

	/*
	 * HACK: It looks like the TBY bit is dropped too soon.
	 * Without this delay things break.
	 */
	udelay(120);

	if (si->newspeed) {
		pxa_irda_set_speed(si, si->newspeed);
		si->newspeed = 0;
	} else {
		int i = 64;

		ICCR0 = 0;
		pxa_irda_fir_dma_rx_start(si);
		while ((ICSR1 & ICSR1_RNE) && i--)
			(void)ICDR;
		ICCR0 = ICCR0_ITR | ICCR0_RXE;

		if (i < 0)
			printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
	}
	netif_wake_queue(dev);
}

/* EIF(Error in FIFO/End in Frame) handler for FIR */
static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
{
	unsigned int len, stat, data;

	/* Get the current data position. */
	len = DTADR(si->rxdma) - si->dma_rx_buff_phy;

	do {
		/* Read Status, and then Data. 	 */
		stat = ICSR1;
		rmb();
		data = ICDR;

		if (stat & (ICSR1_CRE | ICSR1_ROR)) {
			dev->stats.rx_errors++;
			if (stat & ICSR1_CRE) {
				printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
				dev->stats.rx_crc_errors++;
			}
			if (stat & ICSR1_ROR) {
				printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
				dev->stats.rx_over_errors++;
			}
		} else	{
			si->dma_rx_buff[len++] = data;
		}
		/* If we hit the end of frame, there's no point in continuing. */
		if (stat & ICSR1_EOF)
			break;
	} while (ICSR0 & ICSR0_EIF);

	if (stat & ICSR1_EOF) {
		/* end of frame. */
		struct sk_buff *skb;

		if (icsr0 & ICSR0_FRE) {
			printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
			dev->stats.rx_dropped++;
			return;
		}

		skb = alloc_skb(len+1,GFP_ATOMIC);
		if (!skb)  {
			printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
			dev->stats.rx_dropped++;
			return;
		}

		/* Align IP header to 20 bytes  */
		skb_reserve(skb, 1);
		skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
		skb_put(skb, len);

		/* Feed it to IrLAP  */
		skb->dev = dev;
		skb_reset_mac_header(skb);
		skb->protocol = htons(ETH_P_IRDA);
		netif_rx(skb);

		dev->stats.rx_packets++;
		dev->stats.rx_bytes += len;
	}
}

/* FIR interrupt handler */
static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct pxa_irda *si = netdev_priv(dev);
	int icsr0, i = 64;

	/* stop RX DMA */
	DCSR(si->rxdma) &= ~DCSR_RUN;
	si->last_oscr = readl_relaxed(OSCR);
	icsr0 = ICSR0;

	if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
		if (icsr0 & ICSR0_FRE) {
		        printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
			dev->stats.rx_frame_errors++;
		} else {
			printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
			dev->stats.rx_errors++;
		}
		ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
	}

	if (icsr0 & ICSR0_EIF) {
		/* An error in FIFO occurred, or there is a end of frame */
		pxa_irda_fir_irq_eif(si, dev, icsr0);
	}

	ICCR0 = 0;
	pxa_irda_fir_dma_rx_start(si);
	while ((ICSR1 & ICSR1_RNE) && i--)
		(void)ICDR;
	ICCR0 = ICCR0_ITR | ICCR0_RXE;

	if (i < 0)
		printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");

	return IRQ_HANDLED;
}

/* hard_xmit interface of irda device */
static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct pxa_irda *si = netdev_priv(dev);
	int speed = irda_get_next_speed(skb);

	/*
	 * Does this packet contain a request to change the interface
	 * speed?  If so, remember it until we complete the transmission
	 * of this frame.
	 */
	if (speed != si->speed && speed != -1)
		si->newspeed = speed;

	/*
	 * If this is an empty frame, we can bypass a lot.
	 */
	if (skb->len == 0) {
		if (si->newspeed) {
			si->newspeed = 0;
			pxa_irda_set_speed(si, speed);
		}
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	netif_stop_queue(dev);

	if (!IS_FIR(si)) {
		si->tx_buff.data = si->tx_buff.head;
		si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);

		/* Disable STUART interrupts and switch to transmit mode. */
		STIER = 0;
		STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;

		/* enable STUART and transmit interrupts */
		STIER = IER_UUE | IER_TIE;
	} else {
		unsigned long mtt = irda_get_mtt(skb);

		si->dma_tx_buff_len = skb->len;
		skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);

		if (mtt)
			while ((unsigned)(readl_relaxed(OSCR) - si->last_oscr)/4 < mtt)
				cpu_relax();

		/* stop RX DMA,  disable FICP */
		DCSR(si->rxdma) &= ~DCSR_RUN;
		ICCR0 = 0;

		pxa_irda_fir_dma_tx_start(si);
		ICCR0 = ICCR0_ITR | ICCR0_TXE;
	}

	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
{
	struct if_irda_req *rq = (struct if_irda_req *)ifreq;
	struct pxa_irda *si = netdev_priv(dev);
	int ret;

	switch (cmd) {
	case SIOCSBANDWIDTH:
		ret = -EPERM;
		if (capable(CAP_NET_ADMIN)) {
			/*
			 * We are unable to set the speed if the
			 * device is not running.
			 */
			if (netif_running(dev)) {
				ret = pxa_irda_set_speed(si,
						rq->ifr_baudrate);
			} else {
				printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
				ret = 0;
			}
		}
		break;

	case SIOCSMEDIABUSY:
		ret = -EPERM;
		if (capable(CAP_NET_ADMIN)) {
			irda_device_set_media_busy(dev, TRUE);
			ret = 0;
		}
		break;

	case SIOCGRECEIVING:
		ret = 0;
		rq->ifr_receiving = IS_FIR(si) ? 0
					: si->rx_buff.state != OUTSIDE_FRAME;
		break;

	default:
		ret = -EOPNOTSUPP;
		break;
	}

	return ret;
}

static void pxa_irda_startup(struct pxa_irda *si)
{
	/* Disable STUART interrupts */
	STIER = 0;
	/* enable STUART interrupt to the processor */
	STMCR = MCR_OUT2;
	/* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
	STLCR = LCR_WLS0 | LCR_WLS1;
	/* enable FIFO, we use FIFO to improve performance */
	STFCR = FCR_TRFIFOE | FCR_ITL_32;

	/* disable FICP */
	ICCR0 = 0;
	/* configure FICP ICCR2 */
	ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;

	/* configure DMAC */
	DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
	DRCMR(18) = si->txdma | DRCMR_MAPVLD;

	/* force SIR reinitialization */
	si->speed = 4000000;
	pxa_irda_set_speed(si, 9600);

	printk(KERN_DEBUG "pxa_ir: irda startup\n");
}

static void pxa_irda_shutdown(struct pxa_irda *si)
{
	unsigned long flags;

	local_irq_save(flags);

	/* disable STUART and interrupt */
	STIER = 0;
	/* disable STUART SIR mode */
	STISR = 0;

	/* disable DMA */
	DCSR(si->txdma) &= ~DCSR_RUN;
	DCSR(si->rxdma) &= ~DCSR_RUN;
	/* disable FICP */
	ICCR0 = 0;

	/* disable the STUART or FICP clocks */
	pxa_irda_disable_clk(si);

	DRCMR(17) = 0;
	DRCMR(18) = 0;

	local_irq_restore(flags);

	/* power off board transceiver */
	pxa_irda_set_mode(si, IR_OFF);

	printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
}

static int pxa_irda_start(struct net_device *dev)
{
	struct pxa_irda *si = netdev_priv(dev);
	int err;

	si->speed = 9600;

	err = request_irq(si->uart_irq, pxa_irda_sir_irq, 0, dev->name, dev);
	if (err)
		goto err_irq1;

	err = request_irq(si->icp_irq, pxa_irda_fir_irq, 0, dev->name, dev);
	if (err)
		goto err_irq2;

	/*
	 * The interrupt must remain disabled for now.
	 */
	disable_irq(si->uart_irq);
	disable_irq(si->icp_irq);

	err = -EBUSY;
	si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
	if (si->rxdma < 0)
		goto err_rx_dma;

	si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
	if (si->txdma < 0)
		goto err_tx_dma;

	err = -ENOMEM;
	si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
					     &si->dma_rx_buff_phy, GFP_KERNEL);
	if (!si->dma_rx_buff)
		goto err_dma_rx_buff;

	si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
					     &si->dma_tx_buff_phy, GFP_KERNEL);
	if (!si->dma_tx_buff)
		goto err_dma_tx_buff;

	/* Setup the serial port for the initial speed. */
	pxa_irda_startup(si);

	/*
	 * Open a new IrLAP layer instance.
	 */
	si->irlap = irlap_open(dev, &si->qos, "pxa");
	err = -ENOMEM;
	if (!si->irlap)
		goto err_irlap;

	/*
	 * Now enable the interrupt and start the queue
	 */
	enable_irq(si->uart_irq);
	enable_irq(si->icp_irq);
	netif_start_queue(dev);

	printk(KERN_DEBUG "pxa_ir: irda driver opened\n");

	return 0;

err_irlap:
	pxa_irda_shutdown(si);
	dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
err_dma_tx_buff:
	dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
err_dma_rx_buff:
	pxa_free_dma(si->txdma);
err_tx_dma:
	pxa_free_dma(si->rxdma);
err_rx_dma:
	free_irq(si->icp_irq, dev);
err_irq2:
	free_irq(si->uart_irq, dev);
err_irq1:

	return err;
}

static int pxa_irda_stop(struct net_device *dev)
{
	struct pxa_irda *si = netdev_priv(dev);

	netif_stop_queue(dev);

	pxa_irda_shutdown(si);

	/* Stop IrLAP */
	if (si->irlap) {
		irlap_close(si->irlap);
		si->irlap = NULL;
	}

	free_irq(si->uart_irq, dev);
	free_irq(si->icp_irq, dev);

	pxa_free_dma(si->rxdma);
	pxa_free_dma(si->txdma);

	if (si->dma_rx_buff)
		dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
	if (si->dma_tx_buff)
		dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);

	printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
	return 0;
}

static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
{
	struct net_device *dev = platform_get_drvdata(_dev);
	struct pxa_irda *si;

	if (dev && netif_running(dev)) {
		si = netdev_priv(dev);
		netif_device_detach(dev);
		pxa_irda_shutdown(si);
	}

	return 0;
}

static int pxa_irda_resume(struct platform_device *_dev)
{
	struct net_device *dev = platform_get_drvdata(_dev);
	struct pxa_irda *si;

	if (dev && netif_running(dev)) {
		si = netdev_priv(dev);
		pxa_irda_startup(si);
		netif_device_attach(dev);
		netif_wake_queue(dev);
	}

	return 0;
}


static int pxa_irda_init_iobuf(iobuff_t *io, int size)
{
	io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
	if (io->head != NULL) {
		io->truesize = size;
		io->in_frame = FALSE;
		io->state    = OUTSIDE_FRAME;
		io->data     = io->head;
	}
	return io->head ? 0 : -ENOMEM;
}

static const struct net_device_ops pxa_irda_netdev_ops = {
	.ndo_open		= pxa_irda_start,
	.ndo_stop		= pxa_irda_stop,
	.ndo_start_xmit		= pxa_irda_hard_xmit,
	.ndo_do_ioctl		= pxa_irda_ioctl,
};

static int pxa_irda_probe(struct platform_device *pdev)
{
	struct net_device *dev;
	struct pxa_irda *si;
	unsigned int baudrate_mask;
	int err;

	if (!pdev->dev.platform_data)
		return -ENODEV;

	err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
	if (err)
		goto err_mem_1;

	err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
	if (err)
		goto err_mem_2;

	dev = alloc_irdadev(sizeof(struct pxa_irda));
	if (!dev) {
		err = -ENOMEM;
		goto err_mem_3;
	}

	SET_NETDEV_DEV(dev, &pdev->dev);
	si = netdev_priv(dev);
	si->dev = &pdev->dev;
	si->pdata = pdev->dev.platform_data;

	si->uart_irq = platform_get_irq(pdev, 0);
	si->icp_irq = platform_get_irq(pdev, 1);

	si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
	si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
	if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
		err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
		goto err_mem_4;
	}

	/*
	 * Initialise the SIR buffers
	 */
	err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
	if (err)
		goto err_mem_4;
	err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
	if (err)
		goto err_mem_5;

	if (gpio_is_valid(si->pdata->gpio_pwdown)) {
		err = gpio_request(si->pdata->gpio_pwdown, "IrDA switch");
		if (err)
			goto err_startup;
		err = gpio_direction_output(si->pdata->gpio_pwdown,
					!si->pdata->gpio_pwdown_inverted);
		if (err) {
			gpio_free(si->pdata->gpio_pwdown);
			goto err_startup;
		}
	}

	if (si->pdata->startup) {
		err = si->pdata->startup(si->dev);
		if (err)
			goto err_startup;
	}

	if (gpio_is_valid(si->pdata->gpio_pwdown) && si->pdata->startup)
		dev_warn(si->dev, "gpio_pwdown and startup() both defined!\n");

	dev->netdev_ops = &pxa_irda_netdev_ops;

	irda_init_max_qos_capabilies(&si->qos);

	baudrate_mask = 0;
	if (si->pdata->transceiver_cap & IR_SIRMODE)
		baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
	if (si->pdata->transceiver_cap & IR_FIRMODE)
		baudrate_mask |= IR_4000000 << 8;

	si->qos.baud_rate.bits &= baudrate_mask;
	si->qos.min_turn_time.bits = 7;  /* 1ms or more */

	irda_qos_bits_to_value(&si->qos);

	err = register_netdev(dev);

	if (err == 0)
		dev_set_drvdata(&pdev->dev, dev);

	if (err) {
		if (si->pdata->shutdown)
			si->pdata->shutdown(si->dev);
err_startup:
		kfree(si->tx_buff.head);
err_mem_5:
		kfree(si->rx_buff.head);
err_mem_4:
		if (si->sir_clk && !IS_ERR(si->sir_clk))
			clk_put(si->sir_clk);
		if (si->fir_clk && !IS_ERR(si->fir_clk))
			clk_put(si->fir_clk);
		free_netdev(dev);
err_mem_3:
		release_mem_region(__PREG(FICP), 0x1c);
err_mem_2:
		release_mem_region(__PREG(STUART), 0x24);
	}
err_mem_1:
	return err;
}

static int pxa_irda_remove(struct platform_device *_dev)
{
	struct net_device *dev = platform_get_drvdata(_dev);

	if (dev) {
		struct pxa_irda *si = netdev_priv(dev);
		unregister_netdev(dev);
		if (gpio_is_valid(si->pdata->gpio_pwdown))
			gpio_free(si->pdata->gpio_pwdown);
		if (si->pdata->shutdown)
			si->pdata->shutdown(si->dev);
		kfree(si->tx_buff.head);
		kfree(si->rx_buff.head);
		clk_put(si->fir_clk);
		clk_put(si->sir_clk);
		free_netdev(dev);
	}

	release_mem_region(__PREG(STUART), 0x24);
	release_mem_region(__PREG(FICP), 0x1c);

	return 0;
}

static struct platform_driver pxa_ir_driver = {
	.driver         = {
		.name   = "pxa2xx-ir",
		.owner	= THIS_MODULE,
	},
	.probe		= pxa_irda_probe,
	.remove		= pxa_irda_remove,
	.suspend	= pxa_irda_suspend,
	.resume		= pxa_irda_resume,
};

module_platform_driver(pxa_ir_driver);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-ir");
OpenPOWER on IntegriCloud