rtc: make rtc-ds1553 driver hotplug-aware
[linux-3.10.git] / drivers / rtc / rtc-sh.c
1 /*
2  * SuperH On-Chip RTC Support
3  *
4  * Copyright (C) 2006, 2007  Paul Mundt
5  * Copyright (C) 2006  Jamie Lenehan
6  *
7  * Based on the old arch/sh/kernel/cpu/rtc.c by:
8  *
9  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
10  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
11  *
12  * This file is subject to the terms and conditions of the GNU General Public
13  * License.  See the file "COPYING" in the main directory of this archive
14  * for more details.
15  */
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/bcd.h>
19 #include <linux/rtc.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/seq_file.h>
23 #include <linux/interrupt.h>
24 #include <linux/spinlock.h>
25 #include <linux/io.h>
26 #include <asm/rtc.h>
27
28 #define DRV_NAME        "sh-rtc"
29 #define DRV_VERSION     "0.1.3"
30
31 #ifdef CONFIG_CPU_SH3
32 #define rtc_reg_size            sizeof(u16)
33 #define RTC_BIT_INVERTED        0       /* No bug on SH7708, SH7709A */
34 #define RTC_DEF_CAPABILITIES    0UL
35 #elif defined(CONFIG_CPU_SH4)
36 #define rtc_reg_size            sizeof(u32)
37 #define RTC_BIT_INVERTED        0x40    /* bug on SH7750, SH7750S */
38 #define RTC_DEF_CAPABILITIES    RTC_CAP_4_DIGIT_YEAR
39 #endif
40
41 #define RTC_REG(r)      ((r) * rtc_reg_size)
42
43 #define R64CNT          RTC_REG(0)
44
45 #define RSECCNT         RTC_REG(1)      /* RTC sec */
46 #define RMINCNT         RTC_REG(2)      /* RTC min */
47 #define RHRCNT          RTC_REG(3)      /* RTC hour */
48 #define RWKCNT          RTC_REG(4)      /* RTC week */
49 #define RDAYCNT         RTC_REG(5)      /* RTC day */
50 #define RMONCNT         RTC_REG(6)      /* RTC month */
51 #define RYRCNT          RTC_REG(7)      /* RTC year */
52 #define RSECAR          RTC_REG(8)      /* ALARM sec */
53 #define RMINAR          RTC_REG(9)      /* ALARM min */
54 #define RHRAR           RTC_REG(10)     /* ALARM hour */
55 #define RWKAR           RTC_REG(11)     /* ALARM week */
56 #define RDAYAR          RTC_REG(12)     /* ALARM day */
57 #define RMONAR          RTC_REG(13)     /* ALARM month */
58 #define RCR1            RTC_REG(14)     /* Control */
59 #define RCR2            RTC_REG(15)     /* Control */
60
61 /* ALARM Bits - or with BCD encoded value */
62 #define AR_ENB          0x80    /* Enable for alarm cmp   */
63
64 /* RCR1 Bits */
65 #define RCR1_CF         0x80    /* Carry Flag             */
66 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
67 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
68 #define RCR1_AF         0x01    /* Alarm Flag             */
69
70 /* RCR2 Bits */
71 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
72 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
73 #define RCR2_RTCEN      0x08    /* ENable RTC              */
74 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
75 #define RCR2_RESET      0x02    /* Reset bit               */
76 #define RCR2_START      0x01    /* Start bit               */
77
78 struct sh_rtc {
79         void __iomem *regbase;
80         unsigned long regsize;
81         struct resource *res;
82         unsigned int alarm_irq, periodic_irq, carry_irq;
83         struct rtc_device *rtc_dev;
84         spinlock_t lock;
85         int rearm_aie;
86         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
87 };
88
89 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
90 {
91         struct platform_device *pdev = to_platform_device(dev_id);
92         struct sh_rtc *rtc = platform_get_drvdata(pdev);
93         unsigned int tmp, events = 0;
94
95         spin_lock(&rtc->lock);
96
97         tmp = readb(rtc->regbase + RCR1);
98         tmp &= ~RCR1_CF;
99
100         if (rtc->rearm_aie) {
101                 if (tmp & RCR1_AF)
102                         tmp &= ~RCR1_AF;        /* try to clear AF again */
103                 else {
104                         tmp |= RCR1_AIE;        /* AF has cleared, rearm IRQ */
105                         rtc->rearm_aie = 0;
106                 }
107         }
108
109         writeb(tmp, rtc->regbase + RCR1);
110
111         rtc_update_irq(rtc->rtc_dev, 1, events);
112
113         spin_unlock(&rtc->lock);
114
115         return IRQ_HANDLED;
116 }
117
118 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
119 {
120         struct platform_device *pdev = to_platform_device(dev_id);
121         struct sh_rtc *rtc = platform_get_drvdata(pdev);
122         unsigned int tmp, events = 0;
123
124         spin_lock(&rtc->lock);
125
126         tmp = readb(rtc->regbase + RCR1);
127
128         /*
129          * If AF is set then the alarm has triggered. If we clear AF while
130          * the alarm time still matches the RTC time then AF will
131          * immediately be set again, and if AIE is enabled then the alarm
132          * interrupt will immediately be retrigger. So we clear AIE here
133          * and use rtc->rearm_aie so that the carry interrupt will keep
134          * trying to clear AF and once it stays cleared it'll re-enable
135          * AIE.
136          */
137         if (tmp & RCR1_AF) {
138                 events |= RTC_AF | RTC_IRQF;
139
140                 tmp &= ~(RCR1_AF|RCR1_AIE);
141
142                 writeb(tmp, rtc->regbase + RCR1);
143
144                 rtc->rearm_aie = 1;
145
146                 rtc_update_irq(rtc->rtc_dev, 1, events);
147         }
148
149         spin_unlock(&rtc->lock);
150         return IRQ_HANDLED;
151 }
152
153 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
154 {
155         struct platform_device *pdev = to_platform_device(dev_id);
156         struct sh_rtc *rtc = platform_get_drvdata(pdev);
157
158         spin_lock(&rtc->lock);
159
160         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
161
162         spin_unlock(&rtc->lock);
163
164         return IRQ_HANDLED;
165 }
166
167 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
168 {
169         struct sh_rtc *rtc = dev_get_drvdata(dev);
170         unsigned int tmp;
171
172         spin_lock_irq(&rtc->lock);
173
174         tmp = readb(rtc->regbase + RCR2);
175
176         if (enable) {
177                 tmp &= ~RCR2_PESMASK;
178                 tmp |= RCR2_PEF | (2 << 4);
179         } else
180                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
181
182         writeb(tmp, rtc->regbase + RCR2);
183
184         spin_unlock_irq(&rtc->lock);
185 }
186
187 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
188 {
189         struct sh_rtc *rtc = dev_get_drvdata(dev);
190         unsigned int tmp;
191
192         spin_lock_irq(&rtc->lock);
193
194         tmp = readb(rtc->regbase + RCR1);
195
196         if (!enable) {
197                 tmp &= ~RCR1_AIE;
198                 rtc->rearm_aie = 0;
199         } else if (rtc->rearm_aie == 0)
200                 tmp |= RCR1_AIE;
201
202         writeb(tmp, rtc->regbase + RCR1);
203
204         spin_unlock_irq(&rtc->lock);
205 }
206
207 static int sh_rtc_open(struct device *dev)
208 {
209         struct sh_rtc *rtc = dev_get_drvdata(dev);
210         unsigned int tmp;
211         int ret;
212
213         tmp = readb(rtc->regbase + RCR1);
214         tmp &= ~RCR1_CF;
215         tmp |= RCR1_CIE;
216         writeb(tmp, rtc->regbase + RCR1);
217
218         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
219                           "sh-rtc period", dev);
220         if (unlikely(ret)) {
221                 dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
222                         ret, rtc->periodic_irq);
223                 return ret;
224         }
225
226         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
227                           "sh-rtc carry", dev);
228         if (unlikely(ret)) {
229                 dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
230                         ret, rtc->carry_irq);
231                 free_irq(rtc->periodic_irq, dev);
232                 goto err_bad_carry;
233         }
234
235         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
236                           "sh-rtc alarm", dev);
237         if (unlikely(ret)) {
238                 dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
239                         ret, rtc->alarm_irq);
240                 goto err_bad_alarm;
241         }
242
243         return 0;
244
245 err_bad_alarm:
246         free_irq(rtc->carry_irq, dev);
247 err_bad_carry:
248         free_irq(rtc->periodic_irq, dev);
249
250         return ret;
251 }
252
253 static void sh_rtc_release(struct device *dev)
254 {
255         struct sh_rtc *rtc = dev_get_drvdata(dev);
256
257         sh_rtc_setpie(dev, 0);
258         sh_rtc_setaie(dev, 0);
259
260         free_irq(rtc->periodic_irq, dev);
261         free_irq(rtc->carry_irq, dev);
262         free_irq(rtc->alarm_irq, dev);
263 }
264
265 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
266 {
267         struct sh_rtc *rtc = dev_get_drvdata(dev);
268         unsigned int tmp;
269
270         tmp = readb(rtc->regbase + RCR1);
271         seq_printf(seq, "carry_IRQ\t: %s\n",
272                    (tmp & RCR1_CIE) ? "yes" : "no");
273
274         tmp = readb(rtc->regbase + RCR2);
275         seq_printf(seq, "periodic_IRQ\t: %s\n",
276                    (tmp & RCR2_PEF) ? "yes" : "no");
277
278         return 0;
279 }
280
281 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
282 {
283         unsigned int ret = -ENOIOCTLCMD;
284
285         switch (cmd) {
286         case RTC_PIE_OFF:
287         case RTC_PIE_ON:
288                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
289                 ret = 0;
290                 break;
291         case RTC_AIE_OFF:
292         case RTC_AIE_ON:
293                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
294                 ret = 0;
295                 break;
296         }
297
298         return ret;
299 }
300
301 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
302 {
303         struct platform_device *pdev = to_platform_device(dev);
304         struct sh_rtc *rtc = platform_get_drvdata(pdev);
305         unsigned int sec128, sec2, yr, yr100, cf_bit;
306
307         do {
308                 unsigned int tmp;
309
310                 spin_lock_irq(&rtc->lock);
311
312                 tmp = readb(rtc->regbase + RCR1);
313                 tmp &= ~RCR1_CF; /* Clear CF-bit */
314                 tmp |= RCR1_CIE;
315                 writeb(tmp, rtc->regbase + RCR1);
316
317                 sec128 = readb(rtc->regbase + R64CNT);
318
319                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
320                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
321                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
322                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
323                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
324                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
325
326                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
327                         yr  = readw(rtc->regbase + RYRCNT);
328                         yr100 = BCD2BIN(yr >> 8);
329                         yr &= 0xff;
330                 } else {
331                         yr  = readb(rtc->regbase + RYRCNT);
332                         yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
333                 }
334
335                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
336
337                 sec2 = readb(rtc->regbase + R64CNT);
338                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
339
340                 spin_unlock_irq(&rtc->lock);
341         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
342
343 #if RTC_BIT_INVERTED != 0
344         if ((sec128 & RTC_BIT_INVERTED))
345                 tm->tm_sec--;
346 #endif
347
348         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
349                 "mday=%d, mon=%d, year=%d, wday=%d\n",
350                 __FUNCTION__,
351                 tm->tm_sec, tm->tm_min, tm->tm_hour,
352                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
353
354         if (rtc_valid_tm(tm) < 0)
355                 dev_err(dev, "invalid date\n");
356
357         return 0;
358 }
359
360 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
361 {
362         struct platform_device *pdev = to_platform_device(dev);
363         struct sh_rtc *rtc = platform_get_drvdata(pdev);
364         unsigned int tmp;
365         int year;
366
367         spin_lock_irq(&rtc->lock);
368
369         /* Reset pre-scaler & stop RTC */
370         tmp = readb(rtc->regbase + RCR2);
371         tmp |= RCR2_RESET;
372         tmp &= ~RCR2_START;
373         writeb(tmp, rtc->regbase + RCR2);
374
375         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
376         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
377         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
378         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
379         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
380         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
381
382         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
383                 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
384                         BIN2BCD(tm->tm_year % 100);
385                 writew(year, rtc->regbase + RYRCNT);
386         } else {
387                 year = tm->tm_year % 100;
388                 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
389         }
390
391         /* Start RTC */
392         tmp = readb(rtc->regbase + RCR2);
393         tmp &= ~RCR2_RESET;
394         tmp |= RCR2_RTCEN | RCR2_START;
395         writeb(tmp, rtc->regbase + RCR2);
396
397         spin_unlock_irq(&rtc->lock);
398
399         return 0;
400 }
401
402 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
403 {
404         unsigned int byte;
405         int value = 0xff;       /* return 0xff for ignored values */
406
407         byte = readb(rtc->regbase + reg_off);
408         if (byte & AR_ENB) {
409                 byte &= ~AR_ENB;        /* strip the enable bit */
410                 value = BCD2BIN(byte);
411         }
412
413         return value;
414 }
415
416 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
417 {
418         struct platform_device *pdev = to_platform_device(dev);
419         struct sh_rtc *rtc = platform_get_drvdata(pdev);
420         struct rtc_time* tm = &wkalrm->time;
421
422         spin_lock_irq(&rtc->lock);
423
424         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
425         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
426         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
427         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
428         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
429         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
430         if (tm->tm_mon > 0)
431                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
432         tm->tm_year     = 0xffff;
433
434         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
435
436         spin_unlock_irq(&rtc->lock);
437
438         return 0;
439 }
440
441 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
442                                             int value, int reg_off)
443 {
444         /* < 0 for a value that is ignored */
445         if (value < 0)
446                 writeb(0, rtc->regbase + reg_off);
447         else
448                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
449 }
450
451 static int sh_rtc_check_alarm(struct rtc_time* tm)
452 {
453         /*
454          * The original rtc says anything > 0xc0 is "don't care" or "match
455          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
456          * The original rtc doesn't support years - some things use -1 and
457          * some 0xffff. We use -1 to make out tests easier.
458          */
459         if (tm->tm_year == 0xffff)
460                 tm->tm_year = -1;
461         if (tm->tm_mon >= 0xff)
462                 tm->tm_mon = -1;
463         if (tm->tm_mday >= 0xff)
464                 tm->tm_mday = -1;
465         if (tm->tm_wday >= 0xff)
466                 tm->tm_wday = -1;
467         if (tm->tm_hour >= 0xff)
468                 tm->tm_hour = -1;
469         if (tm->tm_min >= 0xff)
470                 tm->tm_min = -1;
471         if (tm->tm_sec >= 0xff)
472                 tm->tm_sec = -1;
473
474         if (tm->tm_year > 9999 ||
475                 tm->tm_mon >= 12 ||
476                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
477                 tm->tm_wday >= 7 ||
478                 tm->tm_hour >= 24 ||
479                 tm->tm_min >= 60 ||
480                 tm->tm_sec >= 60)
481                 return -EINVAL;
482
483         return 0;
484 }
485
486 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
487 {
488         struct platform_device *pdev = to_platform_device(dev);
489         struct sh_rtc *rtc = platform_get_drvdata(pdev);
490         unsigned int rcr1;
491         struct rtc_time *tm = &wkalrm->time;
492         int mon, err;
493
494         err = sh_rtc_check_alarm(tm);
495         if (unlikely(err < 0))
496                 return err;
497
498         spin_lock_irq(&rtc->lock);
499
500         /* disable alarm interrupt and clear the alarm flag */
501         rcr1 = readb(rtc->regbase + RCR1);
502         rcr1 &= ~(RCR1_AF|RCR1_AIE);
503         writeb(rcr1, rtc->regbase + RCR1);
504
505         rtc->rearm_aie = 0;
506
507         /* set alarm time */
508         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
509         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
510         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
511         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
512         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
513         mon = tm->tm_mon;
514         if (mon >= 0)
515                 mon += 1;
516         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
517
518         if (wkalrm->enabled) {
519                 rcr1 |= RCR1_AIE;
520                 writeb(rcr1, rtc->regbase + RCR1);
521         }
522
523         spin_unlock_irq(&rtc->lock);
524
525         return 0;
526 }
527
528 static struct rtc_class_ops sh_rtc_ops = {
529         .open           = sh_rtc_open,
530         .release        = sh_rtc_release,
531         .ioctl          = sh_rtc_ioctl,
532         .read_time      = sh_rtc_read_time,
533         .set_time       = sh_rtc_set_time,
534         .read_alarm     = sh_rtc_read_alarm,
535         .set_alarm      = sh_rtc_set_alarm,
536         .proc           = sh_rtc_proc,
537 };
538
539 static int __devinit sh_rtc_probe(struct platform_device *pdev)
540 {
541         struct sh_rtc *rtc;
542         struct resource *res;
543         int ret = -ENOENT;
544
545         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
546         if (unlikely(!rtc))
547                 return -ENOMEM;
548
549         spin_lock_init(&rtc->lock);
550
551         rtc->periodic_irq = platform_get_irq(pdev, 0);
552         if (unlikely(rtc->periodic_irq < 0)) {
553                 dev_err(&pdev->dev, "No IRQ for period\n");
554                 goto err_badres;
555         }
556
557         rtc->carry_irq = platform_get_irq(pdev, 1);
558         if (unlikely(rtc->carry_irq < 0)) {
559                 dev_err(&pdev->dev, "No IRQ for carry\n");
560                 goto err_badres;
561         }
562
563         rtc->alarm_irq = platform_get_irq(pdev, 2);
564         if (unlikely(rtc->alarm_irq < 0)) {
565                 dev_err(&pdev->dev, "No IRQ for alarm\n");
566                 goto err_badres;
567         }
568
569         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
570         if (unlikely(res == NULL)) {
571                 dev_err(&pdev->dev, "No IO resource\n");
572                 goto err_badres;
573         }
574
575         rtc->regsize = res->end - res->start + 1;
576
577         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
578         if (unlikely(!rtc->res)) {
579                 ret = -EBUSY;
580                 goto err_badres;
581         }
582
583         rtc->regbase = (void __iomem *)rtc->res->start;
584         if (unlikely(!rtc->regbase)) {
585                 ret = -EINVAL;
586                 goto err_badmap;
587         }
588
589         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
590                                            &sh_rtc_ops, THIS_MODULE);
591         if (IS_ERR(rtc)) {
592                 ret = PTR_ERR(rtc->rtc_dev);
593                 goto err_badmap;
594         }
595
596         rtc->capabilities = RTC_DEF_CAPABILITIES;
597         if (pdev->dev.platform_data) {
598                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
599
600                 /*
601                  * Some CPUs have special capabilities in addition to the
602                  * default set. Add those in here.
603                  */
604                 rtc->capabilities |= pinfo->capabilities;
605         }
606
607         platform_set_drvdata(pdev, rtc);
608
609         return 0;
610
611 err_badmap:
612         release_resource(rtc->res);
613 err_badres:
614         kfree(rtc);
615
616         return ret;
617 }
618
619 static int __devexit sh_rtc_remove(struct platform_device *pdev)
620 {
621         struct sh_rtc *rtc = platform_get_drvdata(pdev);
622
623         if (likely(rtc->rtc_dev))
624                 rtc_device_unregister(rtc->rtc_dev);
625
626         sh_rtc_setpie(&pdev->dev, 0);
627         sh_rtc_setaie(&pdev->dev, 0);
628
629         release_resource(rtc->res);
630
631         platform_set_drvdata(pdev, NULL);
632
633         kfree(rtc);
634
635         return 0;
636 }
637 static struct platform_driver sh_rtc_platform_driver = {
638         .driver         = {
639                 .name   = DRV_NAME,
640                 .owner  = THIS_MODULE,
641         },
642         .probe          = sh_rtc_probe,
643         .remove         = __devexit_p(sh_rtc_remove),
644 };
645
646 static int __init sh_rtc_init(void)
647 {
648         return platform_driver_register(&sh_rtc_platform_driver);
649 }
650
651 static void __exit sh_rtc_exit(void)
652 {
653         platform_driver_unregister(&sh_rtc_platform_driver);
654 }
655
656 module_init(sh_rtc_init);
657 module_exit(sh_rtc_exit);
658
659 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
660 MODULE_VERSION(DRV_VERSION);
661 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, Jamie Lenehan <lenehan@twibble.org>");
662 MODULE_LICENSE("GPL");