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1/*
2 * SuperH Timer Support - TMU
3 *
4 * Copyright (C) 2009 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/clk.h>
17#include <linux/clockchips.h>
18#include <linux/clocksource.h>
19#include <linux/delay.h>
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/interrupt.h>
23#include <linux/io.h>
24#include <linux/ioport.h>
25#include <linux/irq.h>
26#include <linux/module.h>
27#include <linux/of.h>
28#include <linux/platform_device.h>
29#include <linux/pm_domain.h>
30#include <linux/pm_runtime.h>
31#include <linux/sh_timer.h>
32#include <linux/slab.h>
33#include <linux/spinlock.h>
34
35enum sh_tmu_model {
36 SH_TMU,
37 SH_TMU_SH3,
38};
39
40struct sh_tmu_device;
41
42struct sh_tmu_channel {
43 struct sh_tmu_device *tmu;
44 unsigned int index;
45
46 void __iomem *base;
47 int irq;
48
49 unsigned long rate;
50 unsigned long periodic;
51 struct clock_event_device ced;
52 struct clocksource cs;
53 bool cs_enabled;
54 unsigned int enable_count;
55};
56
57struct sh_tmu_device {
58 struct platform_device *pdev;
59
60 void __iomem *mapbase;
61 struct clk *clk;
62
63 enum sh_tmu_model model;
64
65 raw_spinlock_t lock; /* Protect the shared start/stop register */
66
67 struct sh_tmu_channel *channels;
68 unsigned int num_channels;
69
70 bool has_clockevent;
71 bool has_clocksource;
72};
73
74#define TSTR -1 /* shared register */
75#define TCOR 0 /* channel register */
76#define TCNT 1 /* channel register */
77#define TCR 2 /* channel register */
78
79#define TCR_UNF (1 << 8)
80#define TCR_UNIE (1 << 5)
81#define TCR_TPSC_CLK4 (0 << 0)
82#define TCR_TPSC_CLK16 (1 << 0)
83#define TCR_TPSC_CLK64 (2 << 0)
84#define TCR_TPSC_CLK256 (3 << 0)
85#define TCR_TPSC_CLK1024 (4 << 0)
86#define TCR_TPSC_MASK (7 << 0)
87
88static inline unsigned long sh_tmu_read(struct sh_tmu_channel *ch, int reg_nr)
89{
90 unsigned long offs;
91
92 if (reg_nr == TSTR) {
93 switch (ch->tmu->model) {
94 case SH_TMU_SH3:
95 return ioread8(ch->tmu->mapbase + 2);
96 case SH_TMU:
97 return ioread8(ch->tmu->mapbase + 4);
98 }
99 }
100
101 offs = reg_nr << 2;
102
103 if (reg_nr == TCR)
104 return ioread16(ch->base + offs);
105 else
106 return ioread32(ch->base + offs);
107}
108
109static inline void sh_tmu_write(struct sh_tmu_channel *ch, int reg_nr,
110 unsigned long value)
111{
112 unsigned long offs;
113
114 if (reg_nr == TSTR) {
115 switch (ch->tmu->model) {
116 case SH_TMU_SH3:
117 return iowrite8(value, ch->tmu->mapbase + 2);
118 case SH_TMU:
119 return iowrite8(value, ch->tmu->mapbase + 4);
120 }
121 }
122
123 offs = reg_nr << 2;
124
125 if (reg_nr == TCR)
126 iowrite16(value, ch->base + offs);
127 else
128 iowrite32(value, ch->base + offs);
129}
130
131static void sh_tmu_start_stop_ch(struct sh_tmu_channel *ch, int start)
132{
133 unsigned long flags, value;
134
135 /* start stop register shared by multiple timer channels */
136 raw_spin_lock_irqsave(&ch->tmu->lock, flags);
137 value = sh_tmu_read(ch, TSTR);
138
139 if (start)
140 value |= 1 << ch->index;
141 else
142 value &= ~(1 << ch->index);
143
144 sh_tmu_write(ch, TSTR, value);
145 raw_spin_unlock_irqrestore(&ch->tmu->lock, flags);
146}
147
148static int __sh_tmu_enable(struct sh_tmu_channel *ch)
149{
150 int ret;
151
152 /* enable clock */
153 ret = clk_enable(ch->tmu->clk);
154 if (ret) {
155 dev_err(&ch->tmu->pdev->dev, "ch%u: cannot enable clock\n",
156 ch->index);
157 return ret;
158 }
159
160 /* make sure channel is disabled */
161 sh_tmu_start_stop_ch(ch, 0);
162
163 /* maximum timeout */
164 sh_tmu_write(ch, TCOR, 0xffffffff);
165 sh_tmu_write(ch, TCNT, 0xffffffff);
166
167 /* configure channel to parent clock / 4, irq off */
168 ch->rate = clk_get_rate(ch->tmu->clk) / 4;
169 sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
170
171 /* enable channel */
172 sh_tmu_start_stop_ch(ch, 1);
173
174 return 0;
175}
176
177static int sh_tmu_enable(struct sh_tmu_channel *ch)
178{
179 if (ch->enable_count++ > 0)
180 return 0;
181
182 pm_runtime_get_sync(&ch->tmu->pdev->dev);
183 dev_pm_syscore_device(&ch->tmu->pdev->dev, true);
184
185 return __sh_tmu_enable(ch);
186}
187
188static void __sh_tmu_disable(struct sh_tmu_channel *ch)
189{
190 /* disable channel */
191 sh_tmu_start_stop_ch(ch, 0);
192
193 /* disable interrupts in TMU block */
194 sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
195
196 /* stop clock */
197 clk_disable(ch->tmu->clk);
198}
199
200static void sh_tmu_disable(struct sh_tmu_channel *ch)
201{
202 if (WARN_ON(ch->enable_count == 0))
203 return;
204
205 if (--ch->enable_count > 0)
206 return;
207
208 __sh_tmu_disable(ch);
209
210 dev_pm_syscore_device(&ch->tmu->pdev->dev, false);
211 pm_runtime_put(&ch->tmu->pdev->dev);
212}
213
214static void sh_tmu_set_next(struct sh_tmu_channel *ch, unsigned long delta,
215 int periodic)
216{
217 /* stop timer */
218 sh_tmu_start_stop_ch(ch, 0);
219
220 /* acknowledge interrupt */
221 sh_tmu_read(ch, TCR);
222
223 /* enable interrupt */
224 sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
225
226 /* reload delta value in case of periodic timer */
227 if (periodic)
228 sh_tmu_write(ch, TCOR, delta);
229 else
230 sh_tmu_write(ch, TCOR, 0xffffffff);
231
232 sh_tmu_write(ch, TCNT, delta);
233
234 /* start timer */
235 sh_tmu_start_stop_ch(ch, 1);
236}
237
238static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
239{
240 struct sh_tmu_channel *ch = dev_id;
241
242 /* disable or acknowledge interrupt */
243 if (clockevent_state_oneshot(&ch->ced))
244 sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
245 else
246 sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
247
248 /* notify clockevent layer */
249 ch->ced.event_handler(&ch->ced);
250 return IRQ_HANDLED;
251}
252
253static struct sh_tmu_channel *cs_to_sh_tmu(struct clocksource *cs)
254{
255 return container_of(cs, struct sh_tmu_channel, cs);
256}
257
258static u64 sh_tmu_clocksource_read(struct clocksource *cs)
259{
260 struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
261
262 return sh_tmu_read(ch, TCNT) ^ 0xffffffff;
263}
264
265static int sh_tmu_clocksource_enable(struct clocksource *cs)
266{
267 struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
268 int ret;
269
270 if (WARN_ON(ch->cs_enabled))
271 return 0;
272
273 ret = sh_tmu_enable(ch);
274 if (!ret) {
275 __clocksource_update_freq_hz(cs, ch->rate);
276 ch->cs_enabled = true;
277 }
278
279 return ret;
280}
281
282static void sh_tmu_clocksource_disable(struct clocksource *cs)
283{
284 struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
285
286 if (WARN_ON(!ch->cs_enabled))
287 return;
288
289 sh_tmu_disable(ch);
290 ch->cs_enabled = false;
291}
292
293static void sh_tmu_clocksource_suspend(struct clocksource *cs)
294{
295 struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
296
297 if (!ch->cs_enabled)
298 return;
299
300 if (--ch->enable_count == 0) {
301 __sh_tmu_disable(ch);
302 pm_genpd_syscore_poweroff(&ch->tmu->pdev->dev);
303 }
304}
305
306static void sh_tmu_clocksource_resume(struct clocksource *cs)
307{
308 struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
309
310 if (!ch->cs_enabled)
311 return;
312
313 if (ch->enable_count++ == 0) {
314 pm_genpd_syscore_poweron(&ch->tmu->pdev->dev);
315 __sh_tmu_enable(ch);
316 }
317}
318
319static int sh_tmu_register_clocksource(struct sh_tmu_channel *ch,
320 const char *name)
321{
322 struct clocksource *cs = &ch->cs;
323
324 cs->name = name;
325 cs->rating = 200;
326 cs->read = sh_tmu_clocksource_read;
327 cs->enable = sh_tmu_clocksource_enable;
328 cs->disable = sh_tmu_clocksource_disable;
329 cs->suspend = sh_tmu_clocksource_suspend;
330 cs->resume = sh_tmu_clocksource_resume;
331 cs->mask = CLOCKSOURCE_MASK(32);
332 cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
333
334 dev_info(&ch->tmu->pdev->dev, "ch%u: used as clock source\n",
335 ch->index);
336
337 /* Register with dummy 1 Hz value, gets updated in ->enable() */
338 clocksource_register_hz(cs, 1);
339 return 0;
340}
341
342static struct sh_tmu_channel *ced_to_sh_tmu(struct clock_event_device *ced)
343{
344 return container_of(ced, struct sh_tmu_channel, ced);
345}
346
347static void sh_tmu_clock_event_start(struct sh_tmu_channel *ch, int periodic)
348{
349 struct clock_event_device *ced = &ch->ced;
350
351 sh_tmu_enable(ch);
352
353 clockevents_config(ced, ch->rate);
354
355 if (periodic) {
356 ch->periodic = (ch->rate + HZ/2) / HZ;
357 sh_tmu_set_next(ch, ch->periodic, 1);
358 }
359}
360
361static int sh_tmu_clock_event_shutdown(struct clock_event_device *ced)
362{
363 struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
364
365 if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
366 sh_tmu_disable(ch);
367 return 0;
368}
369
370static int sh_tmu_clock_event_set_state(struct clock_event_device *ced,
371 int periodic)
372{
373 struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
374
375 /* deal with old setting first */
376 if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
377 sh_tmu_disable(ch);
378
379 dev_info(&ch->tmu->pdev->dev, "ch%u: used for %s clock events\n",
380 ch->index, periodic ? "periodic" : "oneshot");
381 sh_tmu_clock_event_start(ch, periodic);
382 return 0;
383}
384
385static int sh_tmu_clock_event_set_oneshot(struct clock_event_device *ced)
386{
387 return sh_tmu_clock_event_set_state(ced, 0);
388}
389
390static int sh_tmu_clock_event_set_periodic(struct clock_event_device *ced)
391{
392 return sh_tmu_clock_event_set_state(ced, 1);
393}
394
395static int sh_tmu_clock_event_next(unsigned long delta,
396 struct clock_event_device *ced)
397{
398 struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
399
400 BUG_ON(!clockevent_state_oneshot(ced));
401
402 /* program new delta value */
403 sh_tmu_set_next(ch, delta, 0);
404 return 0;
405}
406
407static void sh_tmu_clock_event_suspend(struct clock_event_device *ced)
408{
409 pm_genpd_syscore_poweroff(&ced_to_sh_tmu(ced)->tmu->pdev->dev);
410}
411
412static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
413{
414 pm_genpd_syscore_poweron(&ced_to_sh_tmu(ced)->tmu->pdev->dev);
415}
416
417static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch,
418 const char *name)
419{
420 struct clock_event_device *ced = &ch->ced;
421 int ret;
422
423 ced->name = name;
424 ced->features = CLOCK_EVT_FEAT_PERIODIC;
425 ced->features |= CLOCK_EVT_FEAT_ONESHOT;
426 ced->rating = 200;
427 ced->cpumask = cpu_possible_mask;
428 ced->set_next_event = sh_tmu_clock_event_next;
429 ced->set_state_shutdown = sh_tmu_clock_event_shutdown;
430 ced->set_state_periodic = sh_tmu_clock_event_set_periodic;
431 ced->set_state_oneshot = sh_tmu_clock_event_set_oneshot;
432 ced->suspend = sh_tmu_clock_event_suspend;
433 ced->resume = sh_tmu_clock_event_resume;
434
435 dev_info(&ch->tmu->pdev->dev, "ch%u: used for clock events\n",
436 ch->index);
437
438 clockevents_config_and_register(ced, 1, 0x300, 0xffffffff);
439
440 ret = request_irq(ch->irq, sh_tmu_interrupt,
441 IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
442 dev_name(&ch->tmu->pdev->dev), ch);
443 if (ret) {
444 dev_err(&ch->tmu->pdev->dev, "ch%u: failed to request irq %d\n",
445 ch->index, ch->irq);
446 return;
447 }
448}
449
450static int sh_tmu_register(struct sh_tmu_channel *ch, const char *name,
451 bool clockevent, bool clocksource)
452{
453 if (clockevent) {
454 ch->tmu->has_clockevent = true;
455 sh_tmu_register_clockevent(ch, name);
456 } else if (clocksource) {
457 ch->tmu->has_clocksource = true;
458 sh_tmu_register_clocksource(ch, name);
459 }
460
461 return 0;
462}
463
464static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, unsigned int index,
465 bool clockevent, bool clocksource,
466 struct sh_tmu_device *tmu)
467{
468 /* Skip unused channels. */
469 if (!clockevent && !clocksource)
470 return 0;
471
472 ch->tmu = tmu;
473 ch->index = index;
474
475 if (tmu->model == SH_TMU_SH3)
476 ch->base = tmu->mapbase + 4 + ch->index * 12;
477 else
478 ch->base = tmu->mapbase + 8 + ch->index * 12;
479
480 ch->irq = platform_get_irq(tmu->pdev, index);
481 if (ch->irq < 0) {
482 dev_err(&tmu->pdev->dev, "ch%u: failed to get irq\n",
483 ch->index);
484 return ch->irq;
485 }
486
487 ch->cs_enabled = false;
488 ch->enable_count = 0;
489
490 return sh_tmu_register(ch, dev_name(&tmu->pdev->dev),
491 clockevent, clocksource);
492}
493
494static int sh_tmu_map_memory(struct sh_tmu_device *tmu)
495{
496 struct resource *res;
497
498 res = platform_get_resource(tmu->pdev, IORESOURCE_MEM, 0);
499 if (!res) {
500 dev_err(&tmu->pdev->dev, "failed to get I/O memory\n");
501 return -ENXIO;
502 }
503
504 tmu->mapbase = ioremap_nocache(res->start, resource_size(res));
505 if (tmu->mapbase == NULL)
506 return -ENXIO;
507
508 return 0;
509}
510
511static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
512{
513 struct device_node *np = tmu->pdev->dev.of_node;
514
515 tmu->model = SH_TMU;
516 tmu->num_channels = 3;
517
518 of_property_read_u32(np, "#renesas,channels", &tmu->num_channels);
519
520 if (tmu->num_channels != 2 && tmu->num_channels != 3) {
521 dev_err(&tmu->pdev->dev, "invalid number of channels %u\n",
522 tmu->num_channels);
523 return -EINVAL;
524 }
525
526 return 0;
527}
528
529static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
530{
531 unsigned int i;
532 int ret;
533
534 tmu->pdev = pdev;
535
536 raw_spin_lock_init(&tmu->lock);
537
538 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
539 ret = sh_tmu_parse_dt(tmu);
540 if (ret < 0)
541 return ret;
542 } else if (pdev->dev.platform_data) {
543 const struct platform_device_id *id = pdev->id_entry;
544 struct sh_timer_config *cfg = pdev->dev.platform_data;
545
546 tmu->model = id->driver_data;
547 tmu->num_channels = hweight8(cfg->channels_mask);
548 } else {
549 dev_err(&tmu->pdev->dev, "missing platform data\n");
550 return -ENXIO;
551 }
552
553 /* Get hold of clock. */
554 tmu->clk = clk_get(&tmu->pdev->dev, "fck");
555 if (IS_ERR(tmu->clk)) {
556 dev_err(&tmu->pdev->dev, "cannot get clock\n");
557 return PTR_ERR(tmu->clk);
558 }
559
560 ret = clk_prepare(tmu->clk);
561 if (ret < 0)
562 goto err_clk_put;
563
564 /* Map the memory resource. */
565 ret = sh_tmu_map_memory(tmu);
566 if (ret < 0) {
567 dev_err(&tmu->pdev->dev, "failed to remap I/O memory\n");
568 goto err_clk_unprepare;
569 }
570
571 /* Allocate and setup the channels. */
572 tmu->channels = kzalloc(sizeof(*tmu->channels) * tmu->num_channels,
573 GFP_KERNEL);
574 if (tmu->channels == NULL) {
575 ret = -ENOMEM;
576 goto err_unmap;
577 }
578
579 /*
580 * Use the first channel as a clock event device and the second channel
581 * as a clock source.
582 */
583 for (i = 0; i < tmu->num_channels; ++i) {
584 ret = sh_tmu_channel_setup(&tmu->channels[i], i,
585 i == 0, i == 1, tmu);
586 if (ret < 0)
587 goto err_unmap;
588 }
589
590 platform_set_drvdata(pdev, tmu);
591
592 return 0;
593
594err_unmap:
595 kfree(tmu->channels);
596 iounmap(tmu->mapbase);
597err_clk_unprepare:
598 clk_unprepare(tmu->clk);
599err_clk_put:
600 clk_put(tmu->clk);
601 return ret;
602}
603
604static int sh_tmu_probe(struct platform_device *pdev)
605{
606 struct sh_tmu_device *tmu = platform_get_drvdata(pdev);
607 int ret;
608
609 if (!is_early_platform_device(pdev)) {
610 pm_runtime_set_active(&pdev->dev);
611 pm_runtime_enable(&pdev->dev);
612 }
613
614 if (tmu) {
615 dev_info(&pdev->dev, "kept as earlytimer\n");
616 goto out;
617 }
618
619 tmu = kzalloc(sizeof(*tmu), GFP_KERNEL);
620 if (tmu == NULL)
621 return -ENOMEM;
622
623 ret = sh_tmu_setup(tmu, pdev);
624 if (ret) {
625 kfree(tmu);
626 pm_runtime_idle(&pdev->dev);
627 return ret;
628 }
629 if (is_early_platform_device(pdev))
630 return 0;
631
632 out:
633 if (tmu->has_clockevent || tmu->has_clocksource)
634 pm_runtime_irq_safe(&pdev->dev);
635 else
636 pm_runtime_idle(&pdev->dev);
637
638 return 0;
639}
640
641static int sh_tmu_remove(struct platform_device *pdev)
642{
643 return -EBUSY; /* cannot unregister clockevent and clocksource */
644}
645
646static const struct platform_device_id sh_tmu_id_table[] = {
647 { "sh-tmu", SH_TMU },
648 { "sh-tmu-sh3", SH_TMU_SH3 },
649 { }
650};
651MODULE_DEVICE_TABLE(platform, sh_tmu_id_table);
652
653static const struct of_device_id sh_tmu_of_table[] __maybe_unused = {
654 { .compatible = "renesas,tmu" },
655 { }
656};
657MODULE_DEVICE_TABLE(of, sh_tmu_of_table);
658
659static struct platform_driver sh_tmu_device_driver = {
660 .probe = sh_tmu_probe,
661 .remove = sh_tmu_remove,
662 .driver = {
663 .name = "sh_tmu",
664 .of_match_table = of_match_ptr(sh_tmu_of_table),
665 },
666 .id_table = sh_tmu_id_table,
667};
668
669static int __init sh_tmu_init(void)
670{
671 return platform_driver_register(&sh_tmu_device_driver);
672}
673
674static void __exit sh_tmu_exit(void)
675{
676 platform_driver_unregister(&sh_tmu_device_driver);
677}
678
679early_platform_init("earlytimer", &sh_tmu_device_driver);
680subsys_initcall(sh_tmu_init);
681module_exit(sh_tmu_exit);
682
683MODULE_AUTHOR("Magnus Damm");
684MODULE_DESCRIPTION("SuperH TMU Timer Driver");
685MODULE_LICENSE("GPL v2");
1/*
2 * SuperH Timer Support - TMU
3 *
4 * Copyright (C) 2009 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/spinlock.h>
23#include <linux/interrupt.h>
24#include <linux/ioport.h>
25#include <linux/delay.h>
26#include <linux/io.h>
27#include <linux/clk.h>
28#include <linux/irq.h>
29#include <linux/err.h>
30#include <linux/clocksource.h>
31#include <linux/clockchips.h>
32#include <linux/sh_timer.h>
33#include <linux/slab.h>
34#include <linux/module.h>
35#include <linux/pm_domain.h>
36#include <linux/pm_runtime.h>
37
38struct sh_tmu_priv {
39 void __iomem *mapbase;
40 struct clk *clk;
41 struct irqaction irqaction;
42 struct platform_device *pdev;
43 unsigned long rate;
44 unsigned long periodic;
45 struct clock_event_device ced;
46 struct clocksource cs;
47 bool cs_enabled;
48 unsigned int enable_count;
49};
50
51static DEFINE_RAW_SPINLOCK(sh_tmu_lock);
52
53#define TSTR -1 /* shared register */
54#define TCOR 0 /* channel register */
55#define TCNT 1 /* channel register */
56#define TCR 2 /* channel register */
57
58static inline unsigned long sh_tmu_read(struct sh_tmu_priv *p, int reg_nr)
59{
60 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
61 void __iomem *base = p->mapbase;
62 unsigned long offs;
63
64 if (reg_nr == TSTR)
65 return ioread8(base - cfg->channel_offset);
66
67 offs = reg_nr << 2;
68
69 if (reg_nr == TCR)
70 return ioread16(base + offs);
71 else
72 return ioread32(base + offs);
73}
74
75static inline void sh_tmu_write(struct sh_tmu_priv *p, int reg_nr,
76 unsigned long value)
77{
78 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
79 void __iomem *base = p->mapbase;
80 unsigned long offs;
81
82 if (reg_nr == TSTR) {
83 iowrite8(value, base - cfg->channel_offset);
84 return;
85 }
86
87 offs = reg_nr << 2;
88
89 if (reg_nr == TCR)
90 iowrite16(value, base + offs);
91 else
92 iowrite32(value, base + offs);
93}
94
95static void sh_tmu_start_stop_ch(struct sh_tmu_priv *p, int start)
96{
97 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
98 unsigned long flags, value;
99
100 /* start stop register shared by multiple timer channels */
101 raw_spin_lock_irqsave(&sh_tmu_lock, flags);
102 value = sh_tmu_read(p, TSTR);
103
104 if (start)
105 value |= 1 << cfg->timer_bit;
106 else
107 value &= ~(1 << cfg->timer_bit);
108
109 sh_tmu_write(p, TSTR, value);
110 raw_spin_unlock_irqrestore(&sh_tmu_lock, flags);
111}
112
113static int __sh_tmu_enable(struct sh_tmu_priv *p)
114{
115 int ret;
116
117 /* enable clock */
118 ret = clk_enable(p->clk);
119 if (ret) {
120 dev_err(&p->pdev->dev, "cannot enable clock\n");
121 return ret;
122 }
123
124 /* make sure channel is disabled */
125 sh_tmu_start_stop_ch(p, 0);
126
127 /* maximum timeout */
128 sh_tmu_write(p, TCOR, 0xffffffff);
129 sh_tmu_write(p, TCNT, 0xffffffff);
130
131 /* configure channel to parent clock / 4, irq off */
132 p->rate = clk_get_rate(p->clk) / 4;
133 sh_tmu_write(p, TCR, 0x0000);
134
135 /* enable channel */
136 sh_tmu_start_stop_ch(p, 1);
137
138 return 0;
139}
140
141static int sh_tmu_enable(struct sh_tmu_priv *p)
142{
143 if (p->enable_count++ > 0)
144 return 0;
145
146 pm_runtime_get_sync(&p->pdev->dev);
147 dev_pm_syscore_device(&p->pdev->dev, true);
148
149 return __sh_tmu_enable(p);
150}
151
152static void __sh_tmu_disable(struct sh_tmu_priv *p)
153{
154 /* disable channel */
155 sh_tmu_start_stop_ch(p, 0);
156
157 /* disable interrupts in TMU block */
158 sh_tmu_write(p, TCR, 0x0000);
159
160 /* stop clock */
161 clk_disable(p->clk);
162}
163
164static void sh_tmu_disable(struct sh_tmu_priv *p)
165{
166 if (WARN_ON(p->enable_count == 0))
167 return;
168
169 if (--p->enable_count > 0)
170 return;
171
172 __sh_tmu_disable(p);
173
174 dev_pm_syscore_device(&p->pdev->dev, false);
175 pm_runtime_put(&p->pdev->dev);
176}
177
178static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
179 int periodic)
180{
181 /* stop timer */
182 sh_tmu_start_stop_ch(p, 0);
183
184 /* acknowledge interrupt */
185 sh_tmu_read(p, TCR);
186
187 /* enable interrupt */
188 sh_tmu_write(p, TCR, 0x0020);
189
190 /* reload delta value in case of periodic timer */
191 if (periodic)
192 sh_tmu_write(p, TCOR, delta);
193 else
194 sh_tmu_write(p, TCOR, 0xffffffff);
195
196 sh_tmu_write(p, TCNT, delta);
197
198 /* start timer */
199 sh_tmu_start_stop_ch(p, 1);
200}
201
202static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
203{
204 struct sh_tmu_priv *p = dev_id;
205
206 /* disable or acknowledge interrupt */
207 if (p->ced.mode == CLOCK_EVT_MODE_ONESHOT)
208 sh_tmu_write(p, TCR, 0x0000);
209 else
210 sh_tmu_write(p, TCR, 0x0020);
211
212 /* notify clockevent layer */
213 p->ced.event_handler(&p->ced);
214 return IRQ_HANDLED;
215}
216
217static struct sh_tmu_priv *cs_to_sh_tmu(struct clocksource *cs)
218{
219 return container_of(cs, struct sh_tmu_priv, cs);
220}
221
222static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
223{
224 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
225
226 return sh_tmu_read(p, TCNT) ^ 0xffffffff;
227}
228
229static int sh_tmu_clocksource_enable(struct clocksource *cs)
230{
231 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
232 int ret;
233
234 if (WARN_ON(p->cs_enabled))
235 return 0;
236
237 ret = sh_tmu_enable(p);
238 if (!ret) {
239 __clocksource_updatefreq_hz(cs, p->rate);
240 p->cs_enabled = true;
241 }
242
243 return ret;
244}
245
246static void sh_tmu_clocksource_disable(struct clocksource *cs)
247{
248 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
249
250 if (WARN_ON(!p->cs_enabled))
251 return;
252
253 sh_tmu_disable(p);
254 p->cs_enabled = false;
255}
256
257static void sh_tmu_clocksource_suspend(struct clocksource *cs)
258{
259 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
260
261 if (!p->cs_enabled)
262 return;
263
264 if (--p->enable_count == 0) {
265 __sh_tmu_disable(p);
266 pm_genpd_syscore_poweroff(&p->pdev->dev);
267 }
268}
269
270static void sh_tmu_clocksource_resume(struct clocksource *cs)
271{
272 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
273
274 if (!p->cs_enabled)
275 return;
276
277 if (p->enable_count++ == 0) {
278 pm_genpd_syscore_poweron(&p->pdev->dev);
279 __sh_tmu_enable(p);
280 }
281}
282
283static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
284 char *name, unsigned long rating)
285{
286 struct clocksource *cs = &p->cs;
287
288 cs->name = name;
289 cs->rating = rating;
290 cs->read = sh_tmu_clocksource_read;
291 cs->enable = sh_tmu_clocksource_enable;
292 cs->disable = sh_tmu_clocksource_disable;
293 cs->suspend = sh_tmu_clocksource_suspend;
294 cs->resume = sh_tmu_clocksource_resume;
295 cs->mask = CLOCKSOURCE_MASK(32);
296 cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
297
298 dev_info(&p->pdev->dev, "used as clock source\n");
299
300 /* Register with dummy 1 Hz value, gets updated in ->enable() */
301 clocksource_register_hz(cs, 1);
302 return 0;
303}
304
305static struct sh_tmu_priv *ced_to_sh_tmu(struct clock_event_device *ced)
306{
307 return container_of(ced, struct sh_tmu_priv, ced);
308}
309
310static void sh_tmu_clock_event_start(struct sh_tmu_priv *p, int periodic)
311{
312 struct clock_event_device *ced = &p->ced;
313
314 sh_tmu_enable(p);
315
316 clockevents_config(ced, p->rate);
317
318 if (periodic) {
319 p->periodic = (p->rate + HZ/2) / HZ;
320 sh_tmu_set_next(p, p->periodic, 1);
321 }
322}
323
324static void sh_tmu_clock_event_mode(enum clock_event_mode mode,
325 struct clock_event_device *ced)
326{
327 struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
328 int disabled = 0;
329
330 /* deal with old setting first */
331 switch (ced->mode) {
332 case CLOCK_EVT_MODE_PERIODIC:
333 case CLOCK_EVT_MODE_ONESHOT:
334 sh_tmu_disable(p);
335 disabled = 1;
336 break;
337 default:
338 break;
339 }
340
341 switch (mode) {
342 case CLOCK_EVT_MODE_PERIODIC:
343 dev_info(&p->pdev->dev, "used for periodic clock events\n");
344 sh_tmu_clock_event_start(p, 1);
345 break;
346 case CLOCK_EVT_MODE_ONESHOT:
347 dev_info(&p->pdev->dev, "used for oneshot clock events\n");
348 sh_tmu_clock_event_start(p, 0);
349 break;
350 case CLOCK_EVT_MODE_UNUSED:
351 if (!disabled)
352 sh_tmu_disable(p);
353 break;
354 case CLOCK_EVT_MODE_SHUTDOWN:
355 default:
356 break;
357 }
358}
359
360static int sh_tmu_clock_event_next(unsigned long delta,
361 struct clock_event_device *ced)
362{
363 struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
364
365 BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT);
366
367 /* program new delta value */
368 sh_tmu_set_next(p, delta, 0);
369 return 0;
370}
371
372static void sh_tmu_clock_event_suspend(struct clock_event_device *ced)
373{
374 pm_genpd_syscore_poweroff(&ced_to_sh_tmu(ced)->pdev->dev);
375}
376
377static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
378{
379 pm_genpd_syscore_poweron(&ced_to_sh_tmu(ced)->pdev->dev);
380}
381
382static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
383 char *name, unsigned long rating)
384{
385 struct clock_event_device *ced = &p->ced;
386 int ret;
387
388 memset(ced, 0, sizeof(*ced));
389
390 ced->name = name;
391 ced->features = CLOCK_EVT_FEAT_PERIODIC;
392 ced->features |= CLOCK_EVT_FEAT_ONESHOT;
393 ced->rating = rating;
394 ced->cpumask = cpumask_of(0);
395 ced->set_next_event = sh_tmu_clock_event_next;
396 ced->set_mode = sh_tmu_clock_event_mode;
397 ced->suspend = sh_tmu_clock_event_suspend;
398 ced->resume = sh_tmu_clock_event_resume;
399
400 dev_info(&p->pdev->dev, "used for clock events\n");
401
402 clockevents_config_and_register(ced, 1, 0x300, 0xffffffff);
403
404 ret = setup_irq(p->irqaction.irq, &p->irqaction);
405 if (ret) {
406 dev_err(&p->pdev->dev, "failed to request irq %d\n",
407 p->irqaction.irq);
408 return;
409 }
410}
411
412static int sh_tmu_register(struct sh_tmu_priv *p, char *name,
413 unsigned long clockevent_rating,
414 unsigned long clocksource_rating)
415{
416 if (clockevent_rating)
417 sh_tmu_register_clockevent(p, name, clockevent_rating);
418 else if (clocksource_rating)
419 sh_tmu_register_clocksource(p, name, clocksource_rating);
420
421 return 0;
422}
423
424static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
425{
426 struct sh_timer_config *cfg = pdev->dev.platform_data;
427 struct resource *res;
428 int irq, ret;
429 ret = -ENXIO;
430
431 memset(p, 0, sizeof(*p));
432 p->pdev = pdev;
433
434 if (!cfg) {
435 dev_err(&p->pdev->dev, "missing platform data\n");
436 goto err0;
437 }
438
439 platform_set_drvdata(pdev, p);
440
441 res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
442 if (!res) {
443 dev_err(&p->pdev->dev, "failed to get I/O memory\n");
444 goto err0;
445 }
446
447 irq = platform_get_irq(p->pdev, 0);
448 if (irq < 0) {
449 dev_err(&p->pdev->dev, "failed to get irq\n");
450 goto err0;
451 }
452
453 /* map memory, let mapbase point to our channel */
454 p->mapbase = ioremap_nocache(res->start, resource_size(res));
455 if (p->mapbase == NULL) {
456 dev_err(&p->pdev->dev, "failed to remap I/O memory\n");
457 goto err0;
458 }
459
460 /* setup data for setup_irq() (too early for request_irq()) */
461 p->irqaction.name = dev_name(&p->pdev->dev);
462 p->irqaction.handler = sh_tmu_interrupt;
463 p->irqaction.dev_id = p;
464 p->irqaction.irq = irq;
465 p->irqaction.flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING;
466
467 /* get hold of clock */
468 p->clk = clk_get(&p->pdev->dev, "tmu_fck");
469 if (IS_ERR(p->clk)) {
470 dev_err(&p->pdev->dev, "cannot get clock\n");
471 ret = PTR_ERR(p->clk);
472 goto err1;
473 }
474
475 ret = clk_prepare(p->clk);
476 if (ret < 0)
477 goto err2;
478
479 p->cs_enabled = false;
480 p->enable_count = 0;
481
482 ret = sh_tmu_register(p, (char *)dev_name(&p->pdev->dev),
483 cfg->clockevent_rating,
484 cfg->clocksource_rating);
485 if (ret < 0)
486 goto err3;
487
488 return 0;
489
490 err3:
491 clk_unprepare(p->clk);
492 err2:
493 clk_put(p->clk);
494 err1:
495 iounmap(p->mapbase);
496 err0:
497 return ret;
498}
499
500static int sh_tmu_probe(struct platform_device *pdev)
501{
502 struct sh_tmu_priv *p = platform_get_drvdata(pdev);
503 struct sh_timer_config *cfg = pdev->dev.platform_data;
504 int ret;
505
506 if (!is_early_platform_device(pdev)) {
507 pm_runtime_set_active(&pdev->dev);
508 pm_runtime_enable(&pdev->dev);
509 }
510
511 if (p) {
512 dev_info(&pdev->dev, "kept as earlytimer\n");
513 goto out;
514 }
515
516 p = kmalloc(sizeof(*p), GFP_KERNEL);
517 if (p == NULL) {
518 dev_err(&pdev->dev, "failed to allocate driver data\n");
519 return -ENOMEM;
520 }
521
522 ret = sh_tmu_setup(p, pdev);
523 if (ret) {
524 kfree(p);
525 pm_runtime_idle(&pdev->dev);
526 return ret;
527 }
528 if (is_early_platform_device(pdev))
529 return 0;
530
531 out:
532 if (cfg->clockevent_rating || cfg->clocksource_rating)
533 pm_runtime_irq_safe(&pdev->dev);
534 else
535 pm_runtime_idle(&pdev->dev);
536
537 return 0;
538}
539
540static int sh_tmu_remove(struct platform_device *pdev)
541{
542 return -EBUSY; /* cannot unregister clockevent and clocksource */
543}
544
545static struct platform_driver sh_tmu_device_driver = {
546 .probe = sh_tmu_probe,
547 .remove = sh_tmu_remove,
548 .driver = {
549 .name = "sh_tmu",
550 }
551};
552
553static int __init sh_tmu_init(void)
554{
555 return platform_driver_register(&sh_tmu_device_driver);
556}
557
558static void __exit sh_tmu_exit(void)
559{
560 platform_driver_unregister(&sh_tmu_device_driver);
561}
562
563early_platform_init("earlytimer", &sh_tmu_device_driver);
564subsys_initcall(sh_tmu_init);
565module_exit(sh_tmu_exit);
566
567MODULE_AUTHOR("Magnus Damm");
568MODULE_DESCRIPTION("SuperH TMU Timer Driver");
569MODULE_LICENSE("GPL v2");