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[linux-2.6-block.git] / drivers / rtc / rtc-sh.c
CommitLineData
317a6104
PM		 1/*
2 * SuperH On-Chip RTC Support
3 *
b420b1a7 4 * Copyright (C) 2006, 2007, 2008 Paul Mundt
1b73e6ae 5 * Copyright (C) 2006 Jamie Lenehan
b420b1a7 6 * Copyright (C) 2008 Angelo Castello
317a6104
PM		 7 *
8 * Based on the old arch/sh/kernel/cpu/rtc.c by:
9 *
10 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
11 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
12 *
13 * This file is subject to the terms and conditions of the GNU General Public
14 * License. See the file "COPYING" in the main directory of this archive
15 * for more details.
16 */
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/bcd.h>
20#include <linux/rtc.h>
21#include <linux/init.h>
22#include <linux/platform_device.h>
23#include <linux/seq_file.h>
24#include <linux/interrupt.h>
25#include <linux/spinlock.h>
31ccb081 26#include <linux/io.h>
ad89f87a 27#include <asm/rtc.h>
317a6104 28
1b73e6ae 29#define DRV_NAME "sh-rtc"
b420b1a7 30#define DRV_VERSION "0.2.0"
317a6104
PM		 31
32#define RTC_REG(r) ((r) * rtc_reg_size)
33
31ccb081 34#define R64CNT RTC_REG(0)
1b73e6ae
JL		 35
36#define RSECCNT RTC_REG(1) /* RTC sec */
37#define RMINCNT RTC_REG(2) /* RTC min */
38#define RHRCNT RTC_REG(3) /* RTC hour */
39#define RWKCNT RTC_REG(4) /* RTC week */
40#define RDAYCNT RTC_REG(5) /* RTC day */
41#define RMONCNT RTC_REG(6) /* RTC month */
42#define RYRCNT RTC_REG(7) /* RTC year */
43#define RSECAR RTC_REG(8) /* ALARM sec */
44#define RMINAR RTC_REG(9) /* ALARM min */
45#define RHRAR RTC_REG(10) /* ALARM hour */
46#define RWKAR RTC_REG(11) /* ALARM week */
47#define RDAYAR RTC_REG(12) /* ALARM day */
48#define RMONAR RTC_REG(13) /* ALARM month */
49#define RCR1 RTC_REG(14) /* Control */
50#define RCR2 RTC_REG(15) /* Control */
51
ff1b7506
PM		 52/*
53 * Note on RYRAR and RCR3: Up until this point most of the register
54 * definitions are consistent across all of the available parts. However,
55 * the placement of the optional RYRAR and RCR3 (the RYRAR control
56 * register used to control RYRCNT/RYRAR compare) varies considerably
57 * across various parts, occasionally being mapped in to a completely
58 * unrelated address space. For proper RYRAR support a separate resource
59 * would have to be handed off, but as this is purely optional in
60 * practice, we simply opt not to support it, thereby keeping the code
61 * quite a bit more simplified.
62 */
63
1b73e6ae
JL		 64/* ALARM Bits - or with BCD encoded value */
65#define AR_ENB 0x80 /* Enable for alarm cmp */
317a6104 66
b420b1a7
AC		 67/* Period Bits */
68#define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */
69#define PF_COUNT 0x200 /* Half periodic counter */
70#define PF_OXS 0x400 /* Periodic One x Second */
71#define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */
72#define PF_MASK 0xf00
73
317a6104
PM		 74/* RCR1 Bits */
75#define RCR1_CF 0x80 /* Carry Flag */
76#define RCR1_CIE 0x10 /* Carry Interrupt Enable */
77#define RCR1_AIE 0x08 /* Alarm Interrupt Enable */
78#define RCR1_AF 0x01 /* Alarm Flag */
79
80/* RCR2 Bits */
81#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
82#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
83#define RCR2_RTCEN 0x08 /* ENable RTC */
84#define RCR2_ADJ 0x04 /* ADJustment (30-second) */
85#define RCR2_RESET 0x02 /* Reset bit */
86#define RCR2_START 0x01 /* Start bit */
87
88struct sh_rtc {
89 void __iomem *regbase;
90 unsigned long regsize;
91 struct resource *res;
92 unsigned int alarm_irq, periodic_irq, carry_irq;
93 struct rtc_device *rtc_dev;
94 spinlock_t lock;
ad89f87a 95 unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
b420b1a7 96 unsigned short periodic_freq;
317a6104
PM		 97};
98
31ccb081 99static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
317a6104 100{
b420b1a7
AC		 101 struct sh_rtc *rtc = dev_id;
102 unsigned int tmp;
317a6104
PM		 103
104 spin_lock(&rtc->lock);
105
106 tmp = readb(rtc->regbase + RCR1);
1b73e6ae 107 tmp &= ~RCR1_CF;
317a6104
PM		 108 writeb(tmp, rtc->regbase + RCR1);
109
b420b1a7
AC		 110 /* Users have requested One x Second IRQ */
111 if (rtc->periodic_freq & PF_OXS)
112 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
317a6104
PM		 113
114 spin_unlock(&rtc->lock);
115
116 return IRQ_HANDLED;
117}
118
1b73e6ae
JL		 119static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
120{
b420b1a7
AC		 121 struct sh_rtc *rtc = dev_id;
122 unsigned int tmp;
1b73e6ae
JL		 123
124 spin_lock(&rtc->lock);
125
126 tmp = readb(rtc->regbase + RCR1);
b420b1a7 127 tmp &= ~(RCR1_AF | RCR1_AIE);
1b73e6ae
JL		 128 writeb(tmp, rtc->regbase + RCR1);
129
b420b1a7 130 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
1b73e6ae
JL		 131
132 spin_unlock(&rtc->lock);
b420b1a7 133
1b73e6ae
JL		 134 return IRQ_HANDLED;
135}
136
31ccb081 137static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
317a6104 138{
b420b1a7
AC		 139 struct sh_rtc *rtc = dev_id;
140 struct rtc_device *rtc_dev = rtc->rtc_dev;
141 unsigned int tmp;
317a6104
PM		 142
143 spin_lock(&rtc->lock);
144
b420b1a7
AC		 145 tmp = readb(rtc->regbase + RCR2);
146 tmp &= ~RCR2_PEF;
147 writeb(tmp, rtc->regbase + RCR2);
148
149 /* Half period enabled than one skipped and the next notified */
150 if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
151 rtc->periodic_freq &= ~PF_COUNT;
152 else {
153 if (rtc->periodic_freq & PF_HP)
154 rtc->periodic_freq |= PF_COUNT;
155 if (rtc->periodic_freq & PF_KOU) {
156 spin_lock(&rtc_dev->irq_task_lock);
157 if (rtc_dev->irq_task)
158 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
159 spin_unlock(&rtc_dev->irq_task_lock);
160 } else
161 rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
162 }
317a6104
PM		 163
164 spin_unlock(&rtc->lock);
165
166 return IRQ_HANDLED;
167}
168
169static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
170{
171 struct sh_rtc *rtc = dev_get_drvdata(dev);
172 unsigned int tmp;
173
174 spin_lock_irq(&rtc->lock);
175
176 tmp = readb(rtc->regbase + RCR2);
177
178 if (enable) {
b420b1a7
AC		 179 tmp &= ~RCR2_PEF; /* Clear PES bit */
180 tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */
317a6104
PM		 181 } else
182 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
183
184 writeb(tmp, rtc->regbase + RCR2);
185
186 spin_unlock_irq(&rtc->lock);
187}
188
b420b1a7 189static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
317a6104
PM		 190{
191 struct sh_rtc *rtc = dev_get_drvdata(dev);
b420b1a7 192 int tmp, ret = 0;
317a6104
PM		 193
194 spin_lock_irq(&rtc->lock);
b420b1a7 195 tmp = rtc->periodic_freq & PF_MASK;
317a6104 196
b420b1a7
AC		 197 switch (freq) {
198 case 0:
199 rtc->periodic_freq = 0x00;
200 break;
201 case 1:
202 rtc->periodic_freq = 0x60;
203 break;
204 case 2:
205 rtc->periodic_freq = 0x50;
206 break;
207 case 4:
208 rtc->periodic_freq = 0x40;
209 break;
210 case 8:
211 rtc->periodic_freq = 0x30 | PF_HP;
212 break;
213 case 16:
214 rtc->periodic_freq = 0x30;
215 break;
216 case 32:
217 rtc->periodic_freq = 0x20 | PF_HP;
218 break;
219 case 64:
220 rtc->periodic_freq = 0x20;
221 break;
222 case 128:
223 rtc->periodic_freq = 0x10 | PF_HP;
224 break;
225 case 256:
226 rtc->periodic_freq = 0x10;
227 break;
228 default:
229 ret = -ENOTSUPP;
230 }
317a6104 231
b420b1a7
AC		 232 if (ret == 0) {
233 rtc->periodic_freq |= tmp;
234 rtc->rtc_dev->irq_freq = freq;
235 }
317a6104
PM		 236
237 spin_unlock_irq(&rtc->lock);
b420b1a7 238 return ret;
317a6104
PM		 239}
240
b420b1a7 241static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
317a6104
PM		 242{
243 struct sh_rtc *rtc = dev_get_drvdata(dev);
244 unsigned int tmp;
317a6104 245
b420b1a7 246 spin_lock_irq(&rtc->lock);
317a6104 247
b420b1a7 248 tmp = readb(rtc->regbase + RCR1);
317a6104 249
b420b1a7
AC		 250 if (!enable)
251 tmp &= ~RCR1_AIE;
252 else
253 tmp |= RCR1_AIE;
317a6104 254
b420b1a7 255 writeb(tmp, rtc->regbase + RCR1);
317a6104 256
b420b1a7 257 spin_unlock_irq(&rtc->lock);
317a6104
PM		 258}
259
317a6104
PM		 260static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
261{
262 struct sh_rtc *rtc = dev_get_drvdata(dev);
263 unsigned int tmp;
264
265 tmp = readb(rtc->regbase + RCR1);
b420b1a7 266 seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
317a6104
PM		 267
268 tmp = readb(rtc->regbase + RCR2);
269 seq_printf(seq, "periodic_IRQ\t: %s\n",
b420b1a7 270 (tmp & RCR2_PESMASK) ? "yes" : "no");
317a6104
PM		 271
272 return 0;
273}
274
275static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
276{
b420b1a7
AC		 277 struct sh_rtc *rtc = dev_get_drvdata(dev);
278 unsigned int ret = 0;
317a6104
PM		 279
280 switch (cmd) {
281 case RTC_PIE_OFF:
282 case RTC_PIE_ON:
283 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
317a6104
PM		 284 break;
285 case RTC_AIE_OFF:
286 case RTC_AIE_ON:
287 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
317a6104 288 break;
b420b1a7
AC		 289 case RTC_UIE_OFF:
290 rtc->periodic_freq &= ~PF_OXS;
291 break;
292 case RTC_UIE_ON:
293 rtc->periodic_freq |= PF_OXS;
294 break;
295 case RTC_IRQP_READ:
296 ret = put_user(rtc->rtc_dev->irq_freq,
297 (unsigned long __user *)arg);
298 break;
299 case RTC_IRQP_SET:
300 ret = sh_rtc_setfreq(dev, arg);
301 break;
302 default:
303 ret = -ENOIOCTLCMD;
317a6104
PM		 304 }
305
306 return ret;
307}
308
309static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
310{
311 struct platform_device *pdev = to_platform_device(dev);
312 struct sh_rtc *rtc = platform_get_drvdata(pdev);
313 unsigned int sec128, sec2, yr, yr100, cf_bit;
314
315 do {
316 unsigned int tmp;
317
318 spin_lock_irq(&rtc->lock);
319
320 tmp = readb(rtc->regbase + RCR1);
321 tmp &= ~RCR1_CF; /* Clear CF-bit */
322 tmp |= RCR1_CIE;
323 writeb(tmp, rtc->regbase + RCR1);
324
325 sec128 = readb(rtc->regbase + R64CNT);
326
327 tm->tm_sec = BCD2BIN(readb(rtc->regbase + RSECCNT));
328 tm->tm_min = BCD2BIN(readb(rtc->regbase + RMINCNT));
329 tm->tm_hour = BCD2BIN(readb(rtc->regbase + RHRCNT));
330 tm->tm_wday = BCD2BIN(readb(rtc->regbase + RWKCNT));
331 tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
a1614796 332 tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
317a6104 333
ad89f87a
PM		 334 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
335 yr = readw(rtc->regbase + RYRCNT);
336 yr100 = BCD2BIN(yr >> 8);
337 yr &= 0xff;
338 } else {
339 yr = readb(rtc->regbase + RYRCNT);
340 yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
341 }
317a6104
PM		 342
343 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
344
345 sec2 = readb(rtc->regbase + R64CNT);
346 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
347
348 spin_unlock_irq(&rtc->lock);
349 } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
350
351#if RTC_BIT_INVERTED != 0
352 if ((sec128 & RTC_BIT_INVERTED))
353 tm->tm_sec--;
354#endif
355
435c55d1 356 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
317a6104 357 "mday=%d, mon=%d, year=%d, wday=%d\n",
2a4e2b87 358 __func__,
317a6104 359 tm->tm_sec, tm->tm_min, tm->tm_hour,
a1614796 360 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
317a6104 361
0ac554b9 362 if (rtc_valid_tm(tm) < 0) {
317a6104 363 dev_err(dev, "invalid date\n");
0ac554b9
PM		 364 rtc_time_to_tm(0, tm);
365 }
317a6104
PM		 366
367 return 0;
368}
369
370static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
371{
372 struct platform_device *pdev = to_platform_device(dev);
373 struct sh_rtc *rtc = platform_get_drvdata(pdev);
374 unsigned int tmp;
375 int year;
376
377 spin_lock_irq(&rtc->lock);
378
379 /* Reset pre-scaler & stop RTC */
380 tmp = readb(rtc->regbase + RCR2);
381 tmp |= RCR2_RESET;
699bc661 382 tmp &= ~RCR2_START;
317a6104
PM		 383 writeb(tmp, rtc->regbase + RCR2);
384
385 writeb(BIN2BCD(tm->tm_sec), rtc->regbase + RSECCNT);
386 writeb(BIN2BCD(tm->tm_min), rtc->regbase + RMINCNT);
387 writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
388 writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
389 writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
a1614796 390 writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
317a6104 391
ad89f87a
PM		 392 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
393 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
394 BIN2BCD(tm->tm_year % 100);
395 writew(year, rtc->regbase + RYRCNT);
396 } else {
397 year = tm->tm_year % 100;
398 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
399 }
317a6104
PM		 400
401 /* Start RTC */
402 tmp = readb(rtc->regbase + RCR2);
403 tmp &= ~RCR2_RESET;
404 tmp |= RCR2_RTCEN | RCR2_START;
405 writeb(tmp, rtc->regbase + RCR2);
406
407 spin_unlock_irq(&rtc->lock);
408
409 return 0;
410}
411
1b73e6ae
JL		 412static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
413{
414 unsigned int byte;
415 int value = 0xff; /* return 0xff for ignored values */
416
417 byte = readb(rtc->regbase + reg_off);
418 if (byte & AR_ENB) {
419 byte &= ~AR_ENB; /* strip the enable bit */
420 value = BCD2BIN(byte);
421 }
422
423 return value;
424}
425
426static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
427{
428 struct platform_device *pdev = to_platform_device(dev);
429 struct sh_rtc *rtc = platform_get_drvdata(pdev);
b420b1a7 430 struct rtc_time *tm = &wkalrm->time;
1b73e6ae
JL		 431
432 spin_lock_irq(&rtc->lock);
433
434 tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR);
435 tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR);
436 tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR);
437 tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR);
438 tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR);
439 tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR);
440 if (tm->tm_mon > 0)
441 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
442 tm->tm_year = 0xffff;
443
0d103e90
DB		 444 wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
445
1b73e6ae
JL		 446 spin_unlock_irq(&rtc->lock);
447
448 return 0;
449}
450
451static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
452 int value, int reg_off)
453{
454 /* < 0 for a value that is ignored */
455 if (value < 0)
456 writeb(0, rtc->regbase + reg_off);
457 else
458 writeb(BIN2BCD(value) | AR_ENB, rtc->regbase + reg_off);
459}
460
b420b1a7 461static int sh_rtc_check_alarm(struct rtc_time *tm)
1b73e6ae
JL		 462{
463 /*
464 * The original rtc says anything > 0xc0 is "don't care" or "match
465 * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
466 * The original rtc doesn't support years - some things use -1 and
467 * some 0xffff. We use -1 to make out tests easier.
468 */
469 if (tm->tm_year == 0xffff)
470 tm->tm_year = -1;
471 if (tm->tm_mon >= 0xff)
472 tm->tm_mon = -1;
473 if (tm->tm_mday >= 0xff)
474 tm->tm_mday = -1;
475 if (tm->tm_wday >= 0xff)
476 tm->tm_wday = -1;
477 if (tm->tm_hour >= 0xff)
478 tm->tm_hour = -1;
479 if (tm->tm_min >= 0xff)
480 tm->tm_min = -1;
481 if (tm->tm_sec >= 0xff)
482 tm->tm_sec = -1;
483
484 if (tm->tm_year > 9999 ||
485 tm->tm_mon >= 12 ||
486 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
487 tm->tm_wday >= 7 ||
488 tm->tm_hour >= 24 ||
489 tm->tm_min >= 60 ||
490 tm->tm_sec >= 60)
491 return -EINVAL;
492
493 return 0;
494}
495
496static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
497{
498 struct platform_device *pdev = to_platform_device(dev);
499 struct sh_rtc *rtc = platform_get_drvdata(pdev);
500 unsigned int rcr1;
501 struct rtc_time *tm = &wkalrm->time;
502 int mon, err;
503
504 err = sh_rtc_check_alarm(tm);
505 if (unlikely(err < 0))
506 return err;
507
508 spin_lock_irq(&rtc->lock);
509
15c945c3 510 /* disable alarm interrupt and clear the alarm flag */
1b73e6ae 511 rcr1 = readb(rtc->regbase + RCR1);
b420b1a7 512 rcr1 &= ~(RCR1_AF | RCR1_AIE);
15c945c3 513 writeb(rcr1, rtc->regbase + RCR1);
1b73e6ae 514
1b73e6ae
JL		 515 /* set alarm time */
516 sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR);
517 sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR);
518 sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
519 sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
520 sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
521 mon = tm->tm_mon;
522 if (mon >= 0)
523 mon += 1;
524 sh_rtc_write_alarm_value(rtc, mon, RMONAR);
525
15c945c3
JL		 526 if (wkalrm->enabled) {
527 rcr1 |= RCR1_AIE;
528 writeb(rcr1, rtc->regbase + RCR1);
529 }
1b73e6ae
JL		 530
531 spin_unlock_irq(&rtc->lock);
532
533 return 0;
534}
535
b420b1a7
AC		 536static int sh_rtc_irq_set_state(struct device *dev, int enabled)
537{
538 struct platform_device *pdev = to_platform_device(dev);
539 struct sh_rtc *rtc = platform_get_drvdata(pdev);
540
541 if (enabled) {
542 rtc->periodic_freq |= PF_KOU;
543 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
544 } else {
545 rtc->periodic_freq &= ~PF_KOU;
546 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
547 }
548}
549
550static int sh_rtc_irq_set_freq(struct device *dev, int freq)
551{
552 return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
553}
554
317a6104 555static struct rtc_class_ops sh_rtc_ops = {
317a6104
PM		 556 .ioctl = sh_rtc_ioctl,
557 .read_time = sh_rtc_read_time,
558 .set_time = sh_rtc_set_time,
1b73e6ae
JL		 559 .read_alarm = sh_rtc_read_alarm,
560 .set_alarm = sh_rtc_set_alarm,
b420b1a7
AC		 561 .irq_set_state = sh_rtc_irq_set_state,
562 .irq_set_freq = sh_rtc_irq_set_freq,
317a6104
PM		 563 .proc = sh_rtc_proc,
564};
565
566static int __devinit sh_rtc_probe(struct platform_device *pdev)
567{
568 struct sh_rtc *rtc;
569 struct resource *res;
b420b1a7 570 unsigned int tmp;
317a6104
PM		 571 int ret = -ENOENT;
572
573 rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
574 if (unlikely(!rtc))
575 return -ENOMEM;
576
577 spin_lock_init(&rtc->lock);
578
b420b1a7 579 /* get periodic/carry/alarm irqs */
317a6104
PM		 580 rtc->periodic_irq = platform_get_irq(pdev, 0);
581 if (unlikely(rtc->periodic_irq < 0)) {
582 dev_err(&pdev->dev, "No IRQ for period\n");
583 goto err_badres;
584 }
585
586 rtc->carry_irq = platform_get_irq(pdev, 1);
587 if (unlikely(rtc->carry_irq < 0)) {
588 dev_err(&pdev->dev, "No IRQ for carry\n");
589 goto err_badres;
590 }
591
592 rtc->alarm_irq = platform_get_irq(pdev, 2);
593 if (unlikely(rtc->alarm_irq < 0)) {
594 dev_err(&pdev->dev, "No IRQ for alarm\n");
595 goto err_badres;
596 }
597
598 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
599 if (unlikely(res == NULL)) {
600 dev_err(&pdev->dev, "No IO resource\n");
601 goto err_badres;
602 }
603
604 rtc->regsize = res->end - res->start + 1;
605
606 rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
607 if (unlikely(!rtc->res)) {
608 ret = -EBUSY;
609 goto err_badres;
610 }
611
0305794c 612 rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
317a6104
PM		 613 if (unlikely(!rtc->regbase)) {
614 ret = -EINVAL;
615 goto err_badmap;
616 }
617
618 rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
619 &sh_rtc_ops, THIS_MODULE);
29dd0dae 620 if (IS_ERR(rtc->rtc_dev)) {
317a6104 621 ret = PTR_ERR(rtc->rtc_dev);
0305794c 622 goto err_unmap;
317a6104
PM		 623 }
624
ad89f87a
PM		 625 rtc->capabilities = RTC_DEF_CAPABILITIES;
626 if (pdev->dev.platform_data) {
627 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
628
629 /*
630 * Some CPUs have special capabilities in addition to the
631 * default set. Add those in here.
632 */
633 rtc->capabilities |= pinfo->capabilities;
634 }
635
b420b1a7
AC		 636 rtc->rtc_dev->max_user_freq = 256;
637 rtc->rtc_dev->irq_freq = 1;
638 rtc->periodic_freq = 0x60;
639
317a6104
PM		 640 platform_set_drvdata(pdev, rtc);
641
b420b1a7
AC		 642 /* register periodic/carry/alarm irqs */
643 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
644 "sh-rtc period", rtc);
645 if (unlikely(ret)) {
646 dev_err(&pdev->dev,
647 "request period IRQ failed with %d, IRQ %d\n", ret,
648 rtc->periodic_irq);
0305794c 649 goto err_unmap;
b420b1a7
AC		 650 }
651
652 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
653 "sh-rtc carry", rtc);
654 if (unlikely(ret)) {
655 dev_err(&pdev->dev,
656 "request carry IRQ failed with %d, IRQ %d\n", ret,
657 rtc->carry_irq);
658 free_irq(rtc->periodic_irq, rtc);
0305794c 659 goto err_unmap;
b420b1a7
AC		 660 }
661
662 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
663 "sh-rtc alarm", rtc);
664 if (unlikely(ret)) {
665 dev_err(&pdev->dev,
666 "request alarm IRQ failed with %d, IRQ %d\n", ret,
667 rtc->alarm_irq);
668 free_irq(rtc->carry_irq, rtc);
669 free_irq(rtc->periodic_irq, rtc);
0305794c 670 goto err_unmap;
b420b1a7
AC		 671 }
672
673 tmp = readb(rtc->regbase + RCR1);
674 tmp &= ~RCR1_CF;
675 tmp |= RCR1_CIE;
676 writeb(tmp, rtc->regbase + RCR1);
677
317a6104
PM		 678 return 0;
679
0305794c
PM		 680err_unmap:
681 iounmap(rtc->regbase);
317a6104
PM		 682err_badmap:
683 release_resource(rtc->res);
684err_badres:
685 kfree(rtc);
686
687 return ret;
688}
689
690static int __devexit sh_rtc_remove(struct platform_device *pdev)
691{
692 struct sh_rtc *rtc = platform_get_drvdata(pdev);
693
694 if (likely(rtc->rtc_dev))
695 rtc_device_unregister(rtc->rtc_dev);
696
697 sh_rtc_setpie(&pdev->dev, 0);
698 sh_rtc_setaie(&pdev->dev, 0);
699
b420b1a7
AC		 700 free_irq(rtc->carry_irq, rtc);
701 free_irq(rtc->periodic_irq, rtc);
702 free_irq(rtc->alarm_irq, rtc);
703
317a6104
PM		 704 release_resource(rtc->res);
705
0305794c
PM		 706 iounmap(rtc->regbase);
707
317a6104
PM		 708 platform_set_drvdata(pdev, NULL);
709
710 kfree(rtc);
711
712 return 0;
713}
714static struct platform_driver sh_rtc_platform_driver = {
715 .driver = {
1b73e6ae 716 .name = DRV_NAME,
317a6104
PM		 717 .owner = THIS_MODULE,
718 },
719 .probe = sh_rtc_probe,
720 .remove = __devexit_p(sh_rtc_remove),
721};
722
723static int __init sh_rtc_init(void)
724{
725 return platform_driver_register(&sh_rtc_platform_driver);
726}
727
728static void __exit sh_rtc_exit(void)
729{
730 platform_driver_unregister(&sh_rtc_platform_driver);
731}
732
733module_init(sh_rtc_init);
734module_exit(sh_rtc_exit);
735
736MODULE_DESCRIPTION("SuperH on-chip RTC driver");
1b73e6ae 737MODULE_VERSION(DRV_VERSION);
b420b1a7
AC		 738MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
739 "Jamie Lenehan <lenehan@twibble.org>, "
740 "Angelo Castello <angelo.castello@st.com>");
317a6104 741MODULE_LICENSE("GPL");
ad28a07b 742MODULE_ALIAS("platform:" DRV_NAME);
Linux 6.x block layer and io_uring tree(s)