summaryrefslogtreecommitdiff
path: root/drivers/ptp/ptp_qoriq.c
blob: 879cfc1537ac85c062575f75b6d4a628d809f9cb (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PTP 1588 clock for Freescale QorIQ 1588 timer
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
#include <linux/hrtimer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/clk.h>

#include <linux/fsl/ptp_qoriq.h>

/*
 * Register access functions
 */

/* Caller must hold ptp_qoriq->lock. */
static u64 tmr_cnt_read(struct ptp_qoriq *ptp_qoriq)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	u64 ns;
	u32 lo, hi;

	lo = ptp_qoriq->read(&regs->ctrl_regs->tmr_cnt_l);
	hi = ptp_qoriq->read(&regs->ctrl_regs->tmr_cnt_h);
	ns = ((u64) hi) << 32;
	ns |= lo;
	return ns;
}

/* Caller must hold ptp_qoriq->lock. */
static void tmr_cnt_write(struct ptp_qoriq *ptp_qoriq, u64 ns)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	u32 hi = ns >> 32;
	u32 lo = ns & 0xffffffff;

	ptp_qoriq->write(&regs->ctrl_regs->tmr_cnt_l, lo);
	ptp_qoriq->write(&regs->ctrl_regs->tmr_cnt_h, hi);
}

static u64 tmr_offset_read(struct ptp_qoriq *ptp_qoriq)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	u32 lo, hi;
	u64 ns;

	lo = ptp_qoriq->read(&regs->ctrl_regs->tmroff_l);
	hi = ptp_qoriq->read(&regs->ctrl_regs->tmroff_h);
	ns = ((u64) hi) << 32;
	ns |= lo;
	return ns;
}

static void tmr_offset_write(struct ptp_qoriq *ptp_qoriq, u64 delta_ns)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	u32 lo = delta_ns & 0xffffffff;
	u32 hi = delta_ns >> 32;

	ptp_qoriq->write(&regs->ctrl_regs->tmroff_l, lo);
	ptp_qoriq->write(&regs->ctrl_regs->tmroff_h, hi);
}

/* Caller must hold ptp_qoriq->lock. */
static void set_alarm(struct ptp_qoriq *ptp_qoriq)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	u64 ns;
	u32 lo, hi;

	ns = tmr_cnt_read(ptp_qoriq) + tmr_offset_read(ptp_qoriq)
				     + 1500000000ULL;

	ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
	ns -= ptp_qoriq->tclk_period;
	hi = ns >> 32;
	lo = ns & 0xffffffff;
	ptp_qoriq->write(&regs->alarm_regs->tmr_alarm1_l, lo);
	ptp_qoriq->write(&regs->alarm_regs->tmr_alarm1_h, hi);
}

/* Caller must hold ptp_qoriq->lock. */
static void set_fipers(struct ptp_qoriq *ptp_qoriq)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;

	set_alarm(ptp_qoriq);
	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);

	if (ptp_qoriq->fiper3_support)
		ptp_qoriq->write(&regs->fiper_regs->tmr_fiper3,
				 ptp_qoriq->tmr_fiper3);
}

int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, bool update_event)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	struct ptp_clock_event event;
	void __iomem *reg_etts_l;
	void __iomem *reg_etts_h;
	u32 valid, lo, hi;

	switch (index) {
	case 0:
		valid = ETS1_VLD;
		reg_etts_l = &regs->etts_regs->tmr_etts1_l;
		reg_etts_h = &regs->etts_regs->tmr_etts1_h;
		break;
	case 1:
		valid = ETS2_VLD;
		reg_etts_l = &regs->etts_regs->tmr_etts2_l;
		reg_etts_h = &regs->etts_regs->tmr_etts2_h;
		break;
	default:
		return -EINVAL;
	}

	event.type = PTP_CLOCK_EXTTS;
	event.index = index;

	if (ptp_qoriq->extts_fifo_support)
		if (!(ptp_qoriq->read(&regs->ctrl_regs->tmr_stat) & valid))
			return 0;

	do {
		lo = ptp_qoriq->read(reg_etts_l);
		hi = ptp_qoriq->read(reg_etts_h);

		if (update_event) {
			event.timestamp = ((u64) hi) << 32;
			event.timestamp |= lo;
			ptp_clock_event(ptp_qoriq->clock, &event);
		}

		if (!ptp_qoriq->extts_fifo_support)
			break;
	} while (ptp_qoriq->read(&regs->ctrl_regs->tmr_stat) & valid);

	return 0;
}
EXPORT_SYMBOL_GPL(extts_clean_up);

/*
 * Interrupt service routine
 */

irqreturn_t ptp_qoriq_isr(int irq, void *priv)
{
	struct ptp_qoriq *ptp_qoriq = priv;
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	struct ptp_clock_event event;
	u32 ack = 0, mask, val, irqs;

	spin_lock(&ptp_qoriq->lock);

	val = ptp_qoriq->read(&regs->ctrl_regs->tmr_tevent);
	mask = ptp_qoriq->read(&regs->ctrl_regs->tmr_temask);

	spin_unlock(&ptp_qoriq->lock);

	irqs = val & mask;

	if (irqs & ETS1) {
		ack |= ETS1;
		extts_clean_up(ptp_qoriq, 0, true);
	}

	if (irqs & ETS2) {
		ack |= ETS2;
		extts_clean_up(ptp_qoriq, 1, true);
	}

	if (irqs & PP1) {
		ack |= PP1;
		event.type = PTP_CLOCK_PPS;
		ptp_clock_event(ptp_qoriq->clock, &event);
	}

	if (ack) {
		ptp_qoriq->write(&regs->ctrl_regs->tmr_tevent, ack);
		return IRQ_HANDLED;
	} else
		return IRQ_NONE;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_isr);

/*
 * PTP clock operations
 */

int ptp_qoriq_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
	u64 adj, diff;
	u32 tmr_add;
	int neg_adj = 0;
	struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;

	if (scaled_ppm < 0) {
		neg_adj = 1;
		scaled_ppm = -scaled_ppm;
	}
	tmr_add = ptp_qoriq->tmr_add;
	adj = tmr_add;

	/*
	 * Calculate diff and round() to the nearest integer
	 *
	 * diff = adj * (ppb / 1000000000)
	 *      = adj * scaled_ppm / 65536000000
	 */
	diff = mul_u64_u64_div_u64(adj, scaled_ppm, 32768000000);
	diff = DIV64_U64_ROUND_UP(diff, 2);

	tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
	ptp_qoriq->write(&regs->ctrl_regs->tmr_add, tmr_add);

	return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_adjfine);

int ptp_qoriq_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
	struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
	s64 now, curr_delta;
	unsigned long flags;

	spin_lock_irqsave(&ptp_qoriq->lock, flags);

	/* On LS1021A, eTSEC2 and eTSEC3 do not take into account the TMR_OFF
	 * adjustment
	 */
	if (ptp_qoriq->etsec) {
		now = tmr_cnt_read(ptp_qoriq);
		now += delta;
		tmr_cnt_write(ptp_qoriq, now);
	} else {
		curr_delta = tmr_offset_read(ptp_qoriq);
		curr_delta += delta;
		tmr_offset_write(ptp_qoriq, curr_delta);
	}
	set_fipers(ptp_qoriq);

	spin_unlock_irqrestore(&ptp_qoriq->lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_adjtime);

int ptp_qoriq_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
	u64 ns;
	unsigned long flags;
	struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);

	spin_lock_irqsave(&ptp_qoriq->lock, flags);

	ns = tmr_cnt_read(ptp_qoriq) + tmr_offset_read(ptp_qoriq);

	spin_unlock_irqrestore(&ptp_qoriq->lock, flags);

	*ts = ns_to_timespec64(ns);

	return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_gettime);

int ptp_qoriq_settime(struct ptp_clock_info *ptp,
		      const struct timespec64 *ts)
{
	u64 ns;
	unsigned long flags;
	struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);

	ns = timespec64_to_ns(ts);

	spin_lock_irqsave(&ptp_qoriq->lock, flags);

	tmr_offset_write(ptp_qoriq, 0);
	tmr_cnt_write(ptp_qoriq, ns);
	set_fipers(ptp_qoriq);

	spin_unlock_irqrestore(&ptp_qoriq->lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_settime);

int ptp_qoriq_enable(struct ptp_clock_info *ptp,
		     struct ptp_clock_request *rq, int on)
{
	struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
	unsigned long flags;
	u32 bit, mask = 0;

	switch (rq->type) {
	case PTP_CLK_REQ_EXTTS:
		switch (rq->extts.index) {
		case 0:
			bit = ETS1EN;
			break;
		case 1:
			bit = ETS2EN;
			break;
		default:
			return -EINVAL;
		}

		if (on)
			extts_clean_up(ptp_qoriq, rq->extts.index, false);

		break;
	case PTP_CLK_REQ_PPS:
		bit = PP1EN;
		break;
	default:
		return -EOPNOTSUPP;
	}

	spin_lock_irqsave(&ptp_qoriq->lock, flags);

	mask = ptp_qoriq->read(&regs->ctrl_regs->tmr_temask);
	if (on) {
		mask |= bit;
		ptp_qoriq->write(&regs->ctrl_regs->tmr_tevent, bit);
	} else {
		mask &= ~bit;
	}

	ptp_qoriq->write(&regs->ctrl_regs->tmr_temask, mask);

	spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
	return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_enable);

static const struct ptp_clock_info ptp_qoriq_caps = {
	.owner		= THIS_MODULE,
	.name		= "qoriq ptp clock",
	.max_adj	= 512000,
	.n_alarm	= 0,
	.n_ext_ts	= N_EXT_TS,
	.n_per_out	= 0,
	.n_pins		= 0,
	.pps		= 1,
	.adjfine	= ptp_qoriq_adjfine,
	.adjtime	= ptp_qoriq_adjtime,
	.gettime64	= ptp_qoriq_gettime,
	.settime64	= ptp_qoriq_settime,
	.enable		= ptp_qoriq_enable,
};

/**
 * ptp_qoriq_nominal_freq - calculate nominal frequency according to
 *			    reference clock frequency
 *
 * @clk_src: reference clock frequency
 *
 * The nominal frequency is the desired clock frequency.
 * It should be less than the reference clock frequency.
 * It should be a factor of 1000MHz.
 *
 * Return the nominal frequency
 */
static u32 ptp_qoriq_nominal_freq(u32 clk_src)
{
	u32 remainder = 0;

	clk_src /= 1000000;
	remainder = clk_src % 100;
	if (remainder) {
		clk_src -= remainder;
		clk_src += 100;
	}

	do {
		clk_src -= 100;

	} while (1000 % clk_src);

	return clk_src * 1000000;
}

/**
 * ptp_qoriq_auto_config - calculate a set of default configurations
 *
 * @ptp_qoriq: pointer to ptp_qoriq
 * @node: pointer to device_node
 *
 * If below dts properties are not provided, this function will be
 * called to calculate a set of default configurations for them.
 *   "fsl,tclk-period"
 *   "fsl,tmr-prsc"
 *   "fsl,tmr-add"
 *   "fsl,tmr-fiper1"
 *   "fsl,tmr-fiper2"
 *   "fsl,tmr-fiper3" (required only for DPAA2 and ENETC hardware)
 *   "fsl,max-adj"
 *
 * Return 0 if success
 */
static int ptp_qoriq_auto_config(struct ptp_qoriq *ptp_qoriq,
				 struct device_node *node)
{
	struct clk *clk;
	u64 freq_comp;
	u64 max_adj;
	u32 nominal_freq;
	u32 remainder = 0;
	u32 clk_src = 0;

	ptp_qoriq->cksel = DEFAULT_CKSEL;

	clk = of_clk_get(node, 0);
	if (!IS_ERR(clk)) {
		clk_src = clk_get_rate(clk);
		clk_put(clk);
	}

	if (clk_src <= 100000000UL) {
		pr_err("error reference clock value, or lower than 100MHz\n");
		return -EINVAL;
	}

	nominal_freq = ptp_qoriq_nominal_freq(clk_src);
	if (!nominal_freq)
		return -EINVAL;

	ptp_qoriq->tclk_period = 1000000000UL / nominal_freq;
	ptp_qoriq->tmr_prsc = DEFAULT_TMR_PRSC;

	/* Calculate initial frequency compensation value for TMR_ADD register.
	 * freq_comp = ceil(2^32 / freq_ratio)
	 * freq_ratio = reference_clock_freq / nominal_freq
	 */
	freq_comp = ((u64)1 << 32) * nominal_freq;
	freq_comp = div_u64_rem(freq_comp, clk_src, &remainder);
	if (remainder)
		freq_comp++;

	ptp_qoriq->tmr_add = freq_comp;
	ptp_qoriq->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - ptp_qoriq->tclk_period;
	ptp_qoriq->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - ptp_qoriq->tclk_period;
	ptp_qoriq->tmr_fiper3 = DEFAULT_FIPER3_PERIOD - ptp_qoriq->tclk_period;

	/* max_adj = 1000000000 * (freq_ratio - 1.0) - 1
	 * freq_ratio = reference_clock_freq / nominal_freq
	 */
	max_adj = 1000000000ULL * (clk_src - nominal_freq);
	max_adj = div_u64(max_adj, nominal_freq) - 1;
	ptp_qoriq->caps.max_adj = max_adj;

	return 0;
}

int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
		   const struct ptp_clock_info *caps)
{
	struct device_node *node = ptp_qoriq->dev->of_node;
	struct ptp_qoriq_registers *regs;
	struct timespec64 now;
	unsigned long flags;
	u32 tmr_ctrl;

	if (!node)
		return -ENODEV;

	ptp_qoriq->base = base;
	ptp_qoriq->caps = *caps;

	if (of_property_read_u32(node, "fsl,cksel", &ptp_qoriq->cksel))
		ptp_qoriq->cksel = DEFAULT_CKSEL;

	if (of_property_read_bool(node, "fsl,extts-fifo"))
		ptp_qoriq->extts_fifo_support = true;
	else
		ptp_qoriq->extts_fifo_support = false;

	if (of_device_is_compatible(node, "fsl,dpaa2-ptp") ||
	    of_device_is_compatible(node, "fsl,enetc-ptp"))
		ptp_qoriq->fiper3_support = true;

	if (of_property_read_u32(node,
				 "fsl,tclk-period", &ptp_qoriq->tclk_period) ||
	    of_property_read_u32(node,
				 "fsl,tmr-prsc", &ptp_qoriq->tmr_prsc) ||
	    of_property_read_u32(node,
				 "fsl,tmr-add", &ptp_qoriq->tmr_add) ||
	    of_property_read_u32(node,
				 "fsl,tmr-fiper1", &ptp_qoriq->tmr_fiper1) ||
	    of_property_read_u32(node,
				 "fsl,tmr-fiper2", &ptp_qoriq->tmr_fiper2) ||
	    of_property_read_u32(node,
				 "fsl,max-adj", &ptp_qoriq->caps.max_adj) ||
	    (ptp_qoriq->fiper3_support &&
	     of_property_read_u32(node, "fsl,tmr-fiper3",
				  &ptp_qoriq->tmr_fiper3))) {
		pr_warn("device tree node missing required elements, try automatic configuration\n");

		if (ptp_qoriq_auto_config(ptp_qoriq, node))
			return -ENODEV;
	}

	if (of_property_read_bool(node, "little-endian")) {
		ptp_qoriq->read = qoriq_read_le;
		ptp_qoriq->write = qoriq_write_le;
	} else {
		ptp_qoriq->read = qoriq_read_be;
		ptp_qoriq->write = qoriq_write_be;
	}

	/* The eTSEC uses differnt memory map with DPAA/ENETC */
	if (of_device_is_compatible(node, "fsl,etsec-ptp")) {
		ptp_qoriq->etsec = true;
		ptp_qoriq->regs.ctrl_regs = base + ETSEC_CTRL_REGS_OFFSET;
		ptp_qoriq->regs.alarm_regs = base + ETSEC_ALARM_REGS_OFFSET;
		ptp_qoriq->regs.fiper_regs = base + ETSEC_FIPER_REGS_OFFSET;
		ptp_qoriq->regs.etts_regs = base + ETSEC_ETTS_REGS_OFFSET;
	} else {
		ptp_qoriq->regs.ctrl_regs = base + CTRL_REGS_OFFSET;
		ptp_qoriq->regs.alarm_regs = base + ALARM_REGS_OFFSET;
		ptp_qoriq->regs.fiper_regs = base + FIPER_REGS_OFFSET;
		ptp_qoriq->regs.etts_regs = base + ETTS_REGS_OFFSET;
	}

	spin_lock_init(&ptp_qoriq->lock);

	ktime_get_real_ts64(&now);
	ptp_qoriq_settime(&ptp_qoriq->caps, &now);

	tmr_ctrl =
	  (ptp_qoriq->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
	  (ptp_qoriq->cksel & CKSEL_MASK) << CKSEL_SHIFT;

	spin_lock_irqsave(&ptp_qoriq->lock, flags);

	regs = &ptp_qoriq->regs;
	ptp_qoriq->write(&regs->ctrl_regs->tmr_ctrl, tmr_ctrl);
	ptp_qoriq->write(&regs->ctrl_regs->tmr_add, ptp_qoriq->tmr_add);
	ptp_qoriq->write(&regs->ctrl_regs->tmr_prsc, ptp_qoriq->tmr_prsc);
	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);

	if (ptp_qoriq->fiper3_support)
		ptp_qoriq->write(&regs->fiper_regs->tmr_fiper3,
				 ptp_qoriq->tmr_fiper3);

	set_alarm(ptp_qoriq);
	ptp_qoriq->write(&regs->ctrl_regs->tmr_ctrl,
			 tmr_ctrl|FIPERST|RTPE|TE|FRD);

	spin_unlock_irqrestore(&ptp_qoriq->lock, flags);

	ptp_qoriq->clock = ptp_clock_register(&ptp_qoriq->caps, ptp_qoriq->dev);
	if (IS_ERR(ptp_qoriq->clock))
		return PTR_ERR(ptp_qoriq->clock);

	ptp_qoriq->phc_index = ptp_clock_index(ptp_qoriq->clock);
	ptp_qoriq_create_debugfs(ptp_qoriq);
	return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_init);

void ptp_qoriq_free(struct ptp_qoriq *ptp_qoriq)
{
	struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;

	ptp_qoriq->write(&regs->ctrl_regs->tmr_temask, 0);
	ptp_qoriq->write(&regs->ctrl_regs->tmr_ctrl,   0);

	ptp_qoriq_remove_debugfs(ptp_qoriq);
	ptp_clock_unregister(ptp_qoriq->clock);
	iounmap(ptp_qoriq->base);
	free_irq(ptp_qoriq->irq, ptp_qoriq);
}
EXPORT_SYMBOL_GPL(ptp_qoriq_free);

static int ptp_qoriq_probe(struct platform_device *dev)
{
	struct ptp_qoriq *ptp_qoriq;
	int err = -ENOMEM;
	void __iomem *base;

	ptp_qoriq = kzalloc(sizeof(*ptp_qoriq), GFP_KERNEL);
	if (!ptp_qoriq)
		goto no_memory;

	ptp_qoriq->dev = &dev->dev;

	err = -ENODEV;

	ptp_qoriq->irq = platform_get_irq(dev, 0);
	if (ptp_qoriq->irq < 0) {
		pr_err("irq not in device tree\n");
		goto no_node;
	}
	if (request_irq(ptp_qoriq->irq, ptp_qoriq_isr, IRQF_SHARED,
			DRIVER, ptp_qoriq)) {
		pr_err("request_irq failed\n");
		goto no_node;
	}

	ptp_qoriq->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!ptp_qoriq->rsrc) {
		pr_err("no resource\n");
		goto no_resource;
	}
	if (request_resource(&iomem_resource, ptp_qoriq->rsrc)) {
		pr_err("resource busy\n");
		goto no_resource;
	}

	base = ioremap(ptp_qoriq->rsrc->start,
		       resource_size(ptp_qoriq->rsrc));
	if (!base) {
		pr_err("ioremap ptp registers failed\n");
		goto no_ioremap;
	}

	err = ptp_qoriq_init(ptp_qoriq, base, &ptp_qoriq_caps);
	if (err)
		goto no_clock;

	platform_set_drvdata(dev, ptp_qoriq);
	return 0;

no_clock:
	iounmap(base);
no_ioremap:
	release_resource(ptp_qoriq->rsrc);
no_resource:
	free_irq(ptp_qoriq->irq, ptp_qoriq);
no_node:
	kfree(ptp_qoriq);
no_memory:
	return err;
}

static void ptp_qoriq_remove(struct platform_device *dev)
{
	struct ptp_qoriq *ptp_qoriq = platform_get_drvdata(dev);

	ptp_qoriq_free(ptp_qoriq);
	release_resource(ptp_qoriq->rsrc);
	kfree(ptp_qoriq);
}

static const struct of_device_id match_table[] = {
	{ .compatible = "fsl,etsec-ptp" },
	{ .compatible = "fsl,fman-ptp-timer" },
	{},
};
MODULE_DEVICE_TABLE(of, match_table);

static struct platform_driver ptp_qoriq_driver = {
	.driver = {
		.name		= "ptp_qoriq",
		.of_match_table	= match_table,
	},
	.probe       = ptp_qoriq_probe,
	.remove_new  = ptp_qoriq_remove,
};

module_platform_driver(ptp_qoriq_driver);

MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
MODULE_DESCRIPTION("PTP clock for Freescale QorIQ 1588 timer");
MODULE_LICENSE("GPL");