Commit | Line | Data |
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3fb1b6ad MD |
1 | /* |
2 | * SuperH Timer Support - CMT | |
3 | * | |
4 | * Copyright (C) 2008 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> | |
3fb1b6ad MD |
21 | #include <linux/platform_device.h> |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/clk.h> | |
27 | #include <linux/irq.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/clocksource.h> | |
30 | #include <linux/clockchips.h> | |
46a12f74 | 31 | #include <linux/sh_timer.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
3fb1b6ad MD |
33 | |
34 | struct sh_cmt_priv { | |
35 | void __iomem *mapbase; | |
36 | struct clk *clk; | |
37 | unsigned long width; /* 16 or 32 bit version of hardware block */ | |
38 | unsigned long overflow_bit; | |
39 | unsigned long clear_bits; | |
40 | struct irqaction irqaction; | |
41 | struct platform_device *pdev; | |
42 | ||
43 | unsigned long flags; | |
44 | unsigned long match_value; | |
45 | unsigned long next_match_value; | |
46 | unsigned long max_match_value; | |
47 | unsigned long rate; | |
48 | spinlock_t lock; | |
49 | struct clock_event_device ced; | |
19bdc9d0 | 50 | struct clocksource cs; |
3fb1b6ad MD |
51 | unsigned long total_cycles; |
52 | }; | |
53 | ||
54 | static DEFINE_SPINLOCK(sh_cmt_lock); | |
55 | ||
56 | #define CMSTR -1 /* shared register */ | |
57 | #define CMCSR 0 /* channel register */ | |
58 | #define CMCNT 1 /* channel register */ | |
59 | #define CMCOR 2 /* channel register */ | |
60 | ||
61 | static inline unsigned long sh_cmt_read(struct sh_cmt_priv *p, int reg_nr) | |
62 | { | |
46a12f74 | 63 | struct sh_timer_config *cfg = p->pdev->dev.platform_data; |
3fb1b6ad MD |
64 | void __iomem *base = p->mapbase; |
65 | unsigned long offs; | |
66 | ||
67 | if (reg_nr == CMSTR) { | |
68 | offs = 0; | |
69 | base -= cfg->channel_offset; | |
70 | } else | |
71 | offs = reg_nr; | |
72 | ||
73 | if (p->width == 16) | |
74 | offs <<= 1; | |
75 | else { | |
76 | offs <<= 2; | |
77 | if ((reg_nr == CMCNT) || (reg_nr == CMCOR)) | |
78 | return ioread32(base + offs); | |
79 | } | |
80 | ||
81 | return ioread16(base + offs); | |
82 | } | |
83 | ||
84 | static inline void sh_cmt_write(struct sh_cmt_priv *p, int reg_nr, | |
85 | unsigned long value) | |
86 | { | |
46a12f74 | 87 | struct sh_timer_config *cfg = p->pdev->dev.platform_data; |
3fb1b6ad MD |
88 | void __iomem *base = p->mapbase; |
89 | unsigned long offs; | |
90 | ||
91 | if (reg_nr == CMSTR) { | |
92 | offs = 0; | |
93 | base -= cfg->channel_offset; | |
94 | } else | |
95 | offs = reg_nr; | |
96 | ||
97 | if (p->width == 16) | |
98 | offs <<= 1; | |
99 | else { | |
100 | offs <<= 2; | |
101 | if ((reg_nr == CMCNT) || (reg_nr == CMCOR)) { | |
102 | iowrite32(value, base + offs); | |
103 | return; | |
104 | } | |
105 | } | |
106 | ||
107 | iowrite16(value, base + offs); | |
108 | } | |
109 | ||
110 | static unsigned long sh_cmt_get_counter(struct sh_cmt_priv *p, | |
111 | int *has_wrapped) | |
112 | { | |
113 | unsigned long v1, v2, v3; | |
5b644c7a MD |
114 | int o1, o2; |
115 | ||
116 | o1 = sh_cmt_read(p, CMCSR) & p->overflow_bit; | |
3fb1b6ad MD |
117 | |
118 | /* Make sure the timer value is stable. Stolen from acpi_pm.c */ | |
119 | do { | |
5b644c7a | 120 | o2 = o1; |
3fb1b6ad MD |
121 | v1 = sh_cmt_read(p, CMCNT); |
122 | v2 = sh_cmt_read(p, CMCNT); | |
123 | v3 = sh_cmt_read(p, CMCNT); | |
5b644c7a MD |
124 | o1 = sh_cmt_read(p, CMCSR) & p->overflow_bit; |
125 | } while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3) | |
126 | || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2))); | |
3fb1b6ad | 127 | |
5b644c7a | 128 | *has_wrapped = o1; |
3fb1b6ad MD |
129 | return v2; |
130 | } | |
131 | ||
132 | ||
133 | static void sh_cmt_start_stop_ch(struct sh_cmt_priv *p, int start) | |
134 | { | |
46a12f74 | 135 | struct sh_timer_config *cfg = p->pdev->dev.platform_data; |
3fb1b6ad MD |
136 | unsigned long flags, value; |
137 | ||
138 | /* start stop register shared by multiple timer channels */ | |
139 | spin_lock_irqsave(&sh_cmt_lock, flags); | |
140 | value = sh_cmt_read(p, CMSTR); | |
141 | ||
142 | if (start) | |
143 | value |= 1 << cfg->timer_bit; | |
144 | else | |
145 | value &= ~(1 << cfg->timer_bit); | |
146 | ||
147 | sh_cmt_write(p, CMSTR, value); | |
148 | spin_unlock_irqrestore(&sh_cmt_lock, flags); | |
149 | } | |
150 | ||
151 | static int sh_cmt_enable(struct sh_cmt_priv *p, unsigned long *rate) | |
152 | { | |
3fb1b6ad MD |
153 | int ret; |
154 | ||
155 | /* enable clock */ | |
156 | ret = clk_enable(p->clk); | |
157 | if (ret) { | |
214a607a | 158 | dev_err(&p->pdev->dev, "cannot enable clock\n"); |
3fb1b6ad MD |
159 | return ret; |
160 | } | |
3fb1b6ad MD |
161 | |
162 | /* make sure channel is disabled */ | |
163 | sh_cmt_start_stop_ch(p, 0); | |
164 | ||
165 | /* configure channel, periodic mode and maximum timeout */ | |
3014f474 MD |
166 | if (p->width == 16) { |
167 | *rate = clk_get_rate(p->clk) / 512; | |
168 | sh_cmt_write(p, CMCSR, 0x43); | |
169 | } else { | |
170 | *rate = clk_get_rate(p->clk) / 8; | |
3fb1b6ad | 171 | sh_cmt_write(p, CMCSR, 0x01a4); |
3014f474 | 172 | } |
3fb1b6ad MD |
173 | |
174 | sh_cmt_write(p, CMCOR, 0xffffffff); | |
175 | sh_cmt_write(p, CMCNT, 0); | |
176 | ||
177 | /* enable channel */ | |
178 | sh_cmt_start_stop_ch(p, 1); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static void sh_cmt_disable(struct sh_cmt_priv *p) | |
183 | { | |
184 | /* disable channel */ | |
185 | sh_cmt_start_stop_ch(p, 0); | |
186 | ||
be890a1a MD |
187 | /* disable interrupts in CMT block */ |
188 | sh_cmt_write(p, CMCSR, 0); | |
189 | ||
3fb1b6ad MD |
190 | /* stop clock */ |
191 | clk_disable(p->clk); | |
192 | } | |
193 | ||
194 | /* private flags */ | |
195 | #define FLAG_CLOCKEVENT (1 << 0) | |
196 | #define FLAG_CLOCKSOURCE (1 << 1) | |
197 | #define FLAG_REPROGRAM (1 << 2) | |
198 | #define FLAG_SKIPEVENT (1 << 3) | |
199 | #define FLAG_IRQCONTEXT (1 << 4) | |
200 | ||
201 | static void sh_cmt_clock_event_program_verify(struct sh_cmt_priv *p, | |
202 | int absolute) | |
203 | { | |
204 | unsigned long new_match; | |
205 | unsigned long value = p->next_match_value; | |
206 | unsigned long delay = 0; | |
207 | unsigned long now = 0; | |
208 | int has_wrapped; | |
209 | ||
210 | now = sh_cmt_get_counter(p, &has_wrapped); | |
211 | p->flags |= FLAG_REPROGRAM; /* force reprogram */ | |
212 | ||
213 | if (has_wrapped) { | |
214 | /* we're competing with the interrupt handler. | |
215 | * -> let the interrupt handler reprogram the timer. | |
216 | * -> interrupt number two handles the event. | |
217 | */ | |
218 | p->flags |= FLAG_SKIPEVENT; | |
219 | return; | |
220 | } | |
221 | ||
222 | if (absolute) | |
223 | now = 0; | |
224 | ||
225 | do { | |
226 | /* reprogram the timer hardware, | |
227 | * but don't save the new match value yet. | |
228 | */ | |
229 | new_match = now + value + delay; | |
230 | if (new_match > p->max_match_value) | |
231 | new_match = p->max_match_value; | |
232 | ||
233 | sh_cmt_write(p, CMCOR, new_match); | |
234 | ||
235 | now = sh_cmt_get_counter(p, &has_wrapped); | |
236 | if (has_wrapped && (new_match > p->match_value)) { | |
237 | /* we are changing to a greater match value, | |
238 | * so this wrap must be caused by the counter | |
239 | * matching the old value. | |
240 | * -> first interrupt reprograms the timer. | |
241 | * -> interrupt number two handles the event. | |
242 | */ | |
243 | p->flags |= FLAG_SKIPEVENT; | |
244 | break; | |
245 | } | |
246 | ||
247 | if (has_wrapped) { | |
248 | /* we are changing to a smaller match value, | |
249 | * so the wrap must be caused by the counter | |
250 | * matching the new value. | |
251 | * -> save programmed match value. | |
252 | * -> let isr handle the event. | |
253 | */ | |
254 | p->match_value = new_match; | |
255 | break; | |
256 | } | |
257 | ||
258 | /* be safe: verify hardware settings */ | |
259 | if (now < new_match) { | |
260 | /* timer value is below match value, all good. | |
261 | * this makes sure we won't miss any match events. | |
262 | * -> save programmed match value. | |
263 | * -> let isr handle the event. | |
264 | */ | |
265 | p->match_value = new_match; | |
266 | break; | |
267 | } | |
268 | ||
269 | /* the counter has reached a value greater | |
270 | * than our new match value. and since the | |
271 | * has_wrapped flag isn't set we must have | |
272 | * programmed a too close event. | |
273 | * -> increase delay and retry. | |
274 | */ | |
275 | if (delay) | |
276 | delay <<= 1; | |
277 | else | |
278 | delay = 1; | |
279 | ||
280 | if (!delay) | |
214a607a | 281 | dev_warn(&p->pdev->dev, "too long delay\n"); |
3fb1b6ad MD |
282 | |
283 | } while (delay); | |
284 | } | |
285 | ||
286 | static void sh_cmt_set_next(struct sh_cmt_priv *p, unsigned long delta) | |
287 | { | |
288 | unsigned long flags; | |
289 | ||
290 | if (delta > p->max_match_value) | |
214a607a | 291 | dev_warn(&p->pdev->dev, "delta out of range\n"); |
3fb1b6ad MD |
292 | |
293 | spin_lock_irqsave(&p->lock, flags); | |
294 | p->next_match_value = delta; | |
295 | sh_cmt_clock_event_program_verify(p, 0); | |
296 | spin_unlock_irqrestore(&p->lock, flags); | |
297 | } | |
298 | ||
299 | static irqreturn_t sh_cmt_interrupt(int irq, void *dev_id) | |
300 | { | |
301 | struct sh_cmt_priv *p = dev_id; | |
302 | ||
303 | /* clear flags */ | |
304 | sh_cmt_write(p, CMCSR, sh_cmt_read(p, CMCSR) & p->clear_bits); | |
305 | ||
306 | /* update clock source counter to begin with if enabled | |
307 | * the wrap flag should be cleared by the timer specific | |
308 | * isr before we end up here. | |
309 | */ | |
310 | if (p->flags & FLAG_CLOCKSOURCE) | |
311 | p->total_cycles += p->match_value; | |
312 | ||
313 | if (!(p->flags & FLAG_REPROGRAM)) | |
314 | p->next_match_value = p->max_match_value; | |
315 | ||
316 | p->flags |= FLAG_IRQCONTEXT; | |
317 | ||
318 | if (p->flags & FLAG_CLOCKEVENT) { | |
319 | if (!(p->flags & FLAG_SKIPEVENT)) { | |
320 | if (p->ced.mode == CLOCK_EVT_MODE_ONESHOT) { | |
321 | p->next_match_value = p->max_match_value; | |
322 | p->flags |= FLAG_REPROGRAM; | |
323 | } | |
324 | ||
325 | p->ced.event_handler(&p->ced); | |
326 | } | |
327 | } | |
328 | ||
329 | p->flags &= ~FLAG_SKIPEVENT; | |
330 | ||
331 | if (p->flags & FLAG_REPROGRAM) { | |
332 | p->flags &= ~FLAG_REPROGRAM; | |
333 | sh_cmt_clock_event_program_verify(p, 1); | |
334 | ||
335 | if (p->flags & FLAG_CLOCKEVENT) | |
336 | if ((p->ced.mode == CLOCK_EVT_MODE_SHUTDOWN) | |
337 | || (p->match_value == p->next_match_value)) | |
338 | p->flags &= ~FLAG_REPROGRAM; | |
339 | } | |
340 | ||
341 | p->flags &= ~FLAG_IRQCONTEXT; | |
342 | ||
343 | return IRQ_HANDLED; | |
344 | } | |
345 | ||
346 | static int sh_cmt_start(struct sh_cmt_priv *p, unsigned long flag) | |
347 | { | |
348 | int ret = 0; | |
349 | unsigned long flags; | |
350 | ||
351 | spin_lock_irqsave(&p->lock, flags); | |
352 | ||
353 | if (!(p->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) | |
354 | ret = sh_cmt_enable(p, &p->rate); | |
355 | ||
356 | if (ret) | |
357 | goto out; | |
358 | p->flags |= flag; | |
359 | ||
360 | /* setup timeout if no clockevent */ | |
361 | if ((flag == FLAG_CLOCKSOURCE) && (!(p->flags & FLAG_CLOCKEVENT))) | |
362 | sh_cmt_set_next(p, p->max_match_value); | |
363 | out: | |
364 | spin_unlock_irqrestore(&p->lock, flags); | |
365 | ||
366 | return ret; | |
367 | } | |
368 | ||
369 | static void sh_cmt_stop(struct sh_cmt_priv *p, unsigned long flag) | |
370 | { | |
371 | unsigned long flags; | |
372 | unsigned long f; | |
373 | ||
374 | spin_lock_irqsave(&p->lock, flags); | |
375 | ||
376 | f = p->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE); | |
377 | p->flags &= ~flag; | |
378 | ||
379 | if (f && !(p->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) | |
380 | sh_cmt_disable(p); | |
381 | ||
382 | /* adjust the timeout to maximum if only clocksource left */ | |
383 | if ((flag == FLAG_CLOCKEVENT) && (p->flags & FLAG_CLOCKSOURCE)) | |
384 | sh_cmt_set_next(p, p->max_match_value); | |
385 | ||
386 | spin_unlock_irqrestore(&p->lock, flags); | |
387 | } | |
388 | ||
19bdc9d0 MD |
389 | static struct sh_cmt_priv *cs_to_sh_cmt(struct clocksource *cs) |
390 | { | |
391 | return container_of(cs, struct sh_cmt_priv, cs); | |
392 | } | |
393 | ||
394 | static cycle_t sh_cmt_clocksource_read(struct clocksource *cs) | |
395 | { | |
396 | struct sh_cmt_priv *p = cs_to_sh_cmt(cs); | |
397 | unsigned long flags, raw; | |
398 | unsigned long value; | |
399 | int has_wrapped; | |
400 | ||
401 | spin_lock_irqsave(&p->lock, flags); | |
402 | value = p->total_cycles; | |
403 | raw = sh_cmt_get_counter(p, &has_wrapped); | |
404 | ||
405 | if (unlikely(has_wrapped)) | |
5b644c7a | 406 | raw += p->match_value; |
19bdc9d0 MD |
407 | spin_unlock_irqrestore(&p->lock, flags); |
408 | ||
409 | return value + raw; | |
410 | } | |
411 | ||
412 | static int sh_cmt_clocksource_enable(struct clocksource *cs) | |
413 | { | |
414 | struct sh_cmt_priv *p = cs_to_sh_cmt(cs); | |
19bdc9d0 MD |
415 | |
416 | p->total_cycles = 0; | |
417 | ||
f4d7c356 | 418 | return sh_cmt_start(p, FLAG_CLOCKSOURCE); |
19bdc9d0 MD |
419 | } |
420 | ||
421 | static void sh_cmt_clocksource_disable(struct clocksource *cs) | |
422 | { | |
423 | sh_cmt_stop(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE); | |
424 | } | |
425 | ||
c8162884 MD |
426 | static void sh_cmt_clocksource_resume(struct clocksource *cs) |
427 | { | |
428 | sh_cmt_start(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE); | |
429 | } | |
430 | ||
19bdc9d0 MD |
431 | static int sh_cmt_register_clocksource(struct sh_cmt_priv *p, |
432 | char *name, unsigned long rating) | |
433 | { | |
434 | struct clocksource *cs = &p->cs; | |
435 | ||
436 | cs->name = name; | |
437 | cs->rating = rating; | |
438 | cs->read = sh_cmt_clocksource_read; | |
439 | cs->enable = sh_cmt_clocksource_enable; | |
440 | cs->disable = sh_cmt_clocksource_disable; | |
c8162884 MD |
441 | cs->suspend = sh_cmt_clocksource_disable; |
442 | cs->resume = sh_cmt_clocksource_resume; | |
19bdc9d0 MD |
443 | cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8); |
444 | cs->flags = CLOCK_SOURCE_IS_CONTINUOUS; | |
f4d7c356 PM |
445 | |
446 | /* clk_get_rate() needs an enabled clock */ | |
447 | clk_enable(p->clk); | |
448 | p->rate = clk_get_rate(p->clk) / (p->width == 16) ? 512 : 8; | |
449 | clk_disable(p->clk); | |
450 | ||
451 | /* TODO: calculate good shift from rate and counter bit width */ | |
452 | cs->shift = 10; | |
453 | cs->mult = clocksource_hz2mult(p->rate, cs->shift); | |
454 | ||
214a607a | 455 | dev_info(&p->pdev->dev, "used as clock source\n"); |
f4d7c356 | 456 | |
19bdc9d0 | 457 | clocksource_register(cs); |
f4d7c356 | 458 | |
19bdc9d0 MD |
459 | return 0; |
460 | } | |
461 | ||
3fb1b6ad MD |
462 | static struct sh_cmt_priv *ced_to_sh_cmt(struct clock_event_device *ced) |
463 | { | |
464 | return container_of(ced, struct sh_cmt_priv, ced); | |
465 | } | |
466 | ||
467 | static void sh_cmt_clock_event_start(struct sh_cmt_priv *p, int periodic) | |
468 | { | |
469 | struct clock_event_device *ced = &p->ced; | |
470 | ||
471 | sh_cmt_start(p, FLAG_CLOCKEVENT); | |
472 | ||
473 | /* TODO: calculate good shift from rate and counter bit width */ | |
474 | ||
475 | ced->shift = 32; | |
476 | ced->mult = div_sc(p->rate, NSEC_PER_SEC, ced->shift); | |
477 | ced->max_delta_ns = clockevent_delta2ns(p->max_match_value, ced); | |
478 | ced->min_delta_ns = clockevent_delta2ns(0x1f, ced); | |
479 | ||
480 | if (periodic) | |
481 | sh_cmt_set_next(p, (p->rate + HZ/2) / HZ); | |
482 | else | |
483 | sh_cmt_set_next(p, p->max_match_value); | |
484 | } | |
485 | ||
486 | static void sh_cmt_clock_event_mode(enum clock_event_mode mode, | |
487 | struct clock_event_device *ced) | |
488 | { | |
489 | struct sh_cmt_priv *p = ced_to_sh_cmt(ced); | |
490 | ||
491 | /* deal with old setting first */ | |
492 | switch (ced->mode) { | |
493 | case CLOCK_EVT_MODE_PERIODIC: | |
494 | case CLOCK_EVT_MODE_ONESHOT: | |
495 | sh_cmt_stop(p, FLAG_CLOCKEVENT); | |
496 | break; | |
497 | default: | |
498 | break; | |
499 | } | |
500 | ||
501 | switch (mode) { | |
502 | case CLOCK_EVT_MODE_PERIODIC: | |
214a607a | 503 | dev_info(&p->pdev->dev, "used for periodic clock events\n"); |
3fb1b6ad MD |
504 | sh_cmt_clock_event_start(p, 1); |
505 | break; | |
506 | case CLOCK_EVT_MODE_ONESHOT: | |
214a607a | 507 | dev_info(&p->pdev->dev, "used for oneshot clock events\n"); |
3fb1b6ad MD |
508 | sh_cmt_clock_event_start(p, 0); |
509 | break; | |
510 | case CLOCK_EVT_MODE_SHUTDOWN: | |
511 | case CLOCK_EVT_MODE_UNUSED: | |
512 | sh_cmt_stop(p, FLAG_CLOCKEVENT); | |
513 | break; | |
514 | default: | |
515 | break; | |
516 | } | |
517 | } | |
518 | ||
519 | static int sh_cmt_clock_event_next(unsigned long delta, | |
520 | struct clock_event_device *ced) | |
521 | { | |
522 | struct sh_cmt_priv *p = ced_to_sh_cmt(ced); | |
523 | ||
524 | BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT); | |
525 | if (likely(p->flags & FLAG_IRQCONTEXT)) | |
526 | p->next_match_value = delta; | |
527 | else | |
528 | sh_cmt_set_next(p, delta); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static void sh_cmt_register_clockevent(struct sh_cmt_priv *p, | |
534 | char *name, unsigned long rating) | |
535 | { | |
536 | struct clock_event_device *ced = &p->ced; | |
537 | ||
538 | memset(ced, 0, sizeof(*ced)); | |
539 | ||
540 | ced->name = name; | |
541 | ced->features = CLOCK_EVT_FEAT_PERIODIC; | |
542 | ced->features |= CLOCK_EVT_FEAT_ONESHOT; | |
543 | ced->rating = rating; | |
544 | ced->cpumask = cpumask_of(0); | |
545 | ced->set_next_event = sh_cmt_clock_event_next; | |
546 | ced->set_mode = sh_cmt_clock_event_mode; | |
547 | ||
214a607a | 548 | dev_info(&p->pdev->dev, "used for clock events\n"); |
3fb1b6ad MD |
549 | clockevents_register_device(ced); |
550 | } | |
551 | ||
d1fcc0a8 PM |
552 | static int sh_cmt_register(struct sh_cmt_priv *p, char *name, |
553 | unsigned long clockevent_rating, | |
554 | unsigned long clocksource_rating) | |
3fb1b6ad MD |
555 | { |
556 | if (p->width == (sizeof(p->max_match_value) * 8)) | |
557 | p->max_match_value = ~0; | |
558 | else | |
559 | p->max_match_value = (1 << p->width) - 1; | |
560 | ||
561 | p->match_value = p->max_match_value; | |
562 | spin_lock_init(&p->lock); | |
563 | ||
564 | if (clockevent_rating) | |
565 | sh_cmt_register_clockevent(p, name, clockevent_rating); | |
566 | ||
19bdc9d0 MD |
567 | if (clocksource_rating) |
568 | sh_cmt_register_clocksource(p, name, clocksource_rating); | |
569 | ||
3fb1b6ad MD |
570 | return 0; |
571 | } | |
572 | ||
573 | static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev) | |
574 | { | |
46a12f74 | 575 | struct sh_timer_config *cfg = pdev->dev.platform_data; |
3fb1b6ad MD |
576 | struct resource *res; |
577 | int irq, ret; | |
578 | ret = -ENXIO; | |
579 | ||
580 | memset(p, 0, sizeof(*p)); | |
581 | p->pdev = pdev; | |
582 | ||
583 | if (!cfg) { | |
584 | dev_err(&p->pdev->dev, "missing platform data\n"); | |
585 | goto err0; | |
586 | } | |
587 | ||
588 | platform_set_drvdata(pdev, p); | |
589 | ||
590 | res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0); | |
591 | if (!res) { | |
592 | dev_err(&p->pdev->dev, "failed to get I/O memory\n"); | |
593 | goto err0; | |
594 | } | |
595 | ||
596 | irq = platform_get_irq(p->pdev, 0); | |
597 | if (irq < 0) { | |
598 | dev_err(&p->pdev->dev, "failed to get irq\n"); | |
599 | goto err0; | |
600 | } | |
601 | ||
602 | /* map memory, let mapbase point to our channel */ | |
603 | p->mapbase = ioremap_nocache(res->start, resource_size(res)); | |
604 | if (p->mapbase == NULL) { | |
214a607a | 605 | dev_err(&p->pdev->dev, "failed to remap I/O memory\n"); |
3fb1b6ad MD |
606 | goto err0; |
607 | } | |
608 | ||
609 | /* request irq using setup_irq() (too early for request_irq()) */ | |
214a607a | 610 | p->irqaction.name = dev_name(&p->pdev->dev); |
3fb1b6ad MD |
611 | p->irqaction.handler = sh_cmt_interrupt; |
612 | p->irqaction.dev_id = p; | |
fecf066c PM |
613 | p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | \ |
614 | IRQF_IRQPOLL | IRQF_NOBALANCING; | |
3fb1b6ad MD |
615 | |
616 | /* get hold of clock */ | |
c2a25e81 | 617 | p->clk = clk_get(&p->pdev->dev, "cmt_fck"); |
3fb1b6ad | 618 | if (IS_ERR(p->clk)) { |
c2a25e81 PM |
619 | dev_warn(&p->pdev->dev, "using deprecated clock lookup\n"); |
620 | p->clk = clk_get(&p->pdev->dev, cfg->clk); | |
621 | if (IS_ERR(p->clk)) { | |
622 | dev_err(&p->pdev->dev, "cannot get clock\n"); | |
623 | ret = PTR_ERR(p->clk); | |
624 | goto err1; | |
625 | } | |
3fb1b6ad MD |
626 | } |
627 | ||
628 | if (resource_size(res) == 6) { | |
629 | p->width = 16; | |
630 | p->overflow_bit = 0x80; | |
3014f474 | 631 | p->clear_bits = ~0x80; |
3fb1b6ad MD |
632 | } else { |
633 | p->width = 32; | |
634 | p->overflow_bit = 0x8000; | |
635 | p->clear_bits = ~0xc000; | |
636 | } | |
637 | ||
214a607a | 638 | ret = sh_cmt_register(p, (char *)dev_name(&p->pdev->dev), |
da64c2a8 PM |
639 | cfg->clockevent_rating, |
640 | cfg->clocksource_rating); | |
641 | if (ret) { | |
214a607a | 642 | dev_err(&p->pdev->dev, "registration failed\n"); |
da64c2a8 PM |
643 | goto err1; |
644 | } | |
645 | ||
646 | ret = setup_irq(irq, &p->irqaction); | |
647 | if (ret) { | |
214a607a | 648 | dev_err(&p->pdev->dev, "failed to request irq %d\n", irq); |
da64c2a8 PM |
649 | goto err1; |
650 | } | |
651 | ||
652 | return 0; | |
653 | ||
654 | err1: | |
3fb1b6ad | 655 | iounmap(p->mapbase); |
da64c2a8 | 656 | err0: |
3fb1b6ad MD |
657 | return ret; |
658 | } | |
659 | ||
660 | static int __devinit sh_cmt_probe(struct platform_device *pdev) | |
661 | { | |
662 | struct sh_cmt_priv *p = platform_get_drvdata(pdev); | |
663 | int ret; | |
664 | ||
e475eedb | 665 | if (p) { |
214a607a | 666 | dev_info(&pdev->dev, "kept as earlytimer\n"); |
e475eedb MD |
667 | return 0; |
668 | } | |
669 | ||
8e0b8429 | 670 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
3fb1b6ad MD |
671 | if (p == NULL) { |
672 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
673 | return -ENOMEM; | |
674 | } | |
675 | ||
676 | ret = sh_cmt_setup(p, pdev); | |
677 | if (ret) { | |
8e0b8429 | 678 | kfree(p); |
3fb1b6ad MD |
679 | platform_set_drvdata(pdev, NULL); |
680 | } | |
681 | return ret; | |
682 | } | |
683 | ||
684 | static int __devexit sh_cmt_remove(struct platform_device *pdev) | |
685 | { | |
686 | return -EBUSY; /* cannot unregister clockevent and clocksource */ | |
687 | } | |
688 | ||
689 | static struct platform_driver sh_cmt_device_driver = { | |
690 | .probe = sh_cmt_probe, | |
691 | .remove = __devexit_p(sh_cmt_remove), | |
692 | .driver = { | |
693 | .name = "sh_cmt", | |
694 | } | |
695 | }; | |
696 | ||
697 | static int __init sh_cmt_init(void) | |
698 | { | |
699 | return platform_driver_register(&sh_cmt_device_driver); | |
700 | } | |
701 | ||
702 | static void __exit sh_cmt_exit(void) | |
703 | { | |
704 | platform_driver_unregister(&sh_cmt_device_driver); | |
705 | } | |
706 | ||
e475eedb | 707 | early_platform_init("earlytimer", &sh_cmt_device_driver); |
3fb1b6ad MD |
708 | module_init(sh_cmt_init); |
709 | module_exit(sh_cmt_exit); | |
710 | ||
711 | MODULE_AUTHOR("Magnus Damm"); | |
712 | MODULE_DESCRIPTION("SuperH CMT Timer Driver"); | |
713 | MODULE_LICENSE("GPL v2"); |