Merge branch 'linus' into core/iommu
[linux-2.6] / drivers / rtc / rtc-sh.c
1 /*
2  * SuperH On-Chip RTC Support
3  *
4  * Copyright (C) 2006, 2007, 2008  Paul Mundt
5  * Copyright (C) 2006  Jamie Lenehan
6  * Copyright (C) 2008  Angelo Castello
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>
26 #include <linux/io.h>
27 #include <linux/log2.h>
28 #include <asm/rtc.h>
29
30 #define DRV_NAME        "sh-rtc"
31 #define DRV_VERSION     "0.2.0"
32
33 #define RTC_REG(r)      ((r) * rtc_reg_size)
34
35 #define R64CNT          RTC_REG(0)
36
37 #define RSECCNT         RTC_REG(1)      /* RTC sec */
38 #define RMINCNT         RTC_REG(2)      /* RTC min */
39 #define RHRCNT          RTC_REG(3)      /* RTC hour */
40 #define RWKCNT          RTC_REG(4)      /* RTC week */
41 #define RDAYCNT         RTC_REG(5)      /* RTC day */
42 #define RMONCNT         RTC_REG(6)      /* RTC month */
43 #define RYRCNT          RTC_REG(7)      /* RTC year */
44 #define RSECAR          RTC_REG(8)      /* ALARM sec */
45 #define RMINAR          RTC_REG(9)      /* ALARM min */
46 #define RHRAR           RTC_REG(10)     /* ALARM hour */
47 #define RWKAR           RTC_REG(11)     /* ALARM week */
48 #define RDAYAR          RTC_REG(12)     /* ALARM day */
49 #define RMONAR          RTC_REG(13)     /* ALARM month */
50 #define RCR1            RTC_REG(14)     /* Control */
51 #define RCR2            RTC_REG(15)     /* Control */
52
53 /*
54  * Note on RYRAR and RCR3: Up until this point most of the register
55  * definitions are consistent across all of the available parts. However,
56  * the placement of the optional RYRAR and RCR3 (the RYRAR control
57  * register used to control RYRCNT/RYRAR compare) varies considerably
58  * across various parts, occasionally being mapped in to a completely
59  * unrelated address space. For proper RYRAR support a separate resource
60  * would have to be handed off, but as this is purely optional in
61  * practice, we simply opt not to support it, thereby keeping the code
62  * quite a bit more simplified.
63  */
64
65 /* ALARM Bits - or with BCD encoded value */
66 #define AR_ENB          0x80    /* Enable for alarm cmp   */
67
68 /* Period Bits */
69 #define PF_HP           0x100   /* Enable Half Period to support 8,32,128Hz */
70 #define PF_COUNT        0x200   /* Half periodic counter */
71 #define PF_OXS          0x400   /* Periodic One x Second */
72 #define PF_KOU          0x800   /* Kernel or User periodic request 1=kernel */
73 #define PF_MASK         0xf00
74
75 /* RCR1 Bits */
76 #define RCR1_CF         0x80    /* Carry Flag             */
77 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
78 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
79 #define RCR1_AF         0x01    /* Alarm Flag             */
80
81 /* RCR2 Bits */
82 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
83 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
84 #define RCR2_RTCEN      0x08    /* ENable RTC              */
85 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
86 #define RCR2_RESET      0x02    /* Reset bit               */
87 #define RCR2_START      0x01    /* Start bit               */
88
89 struct sh_rtc {
90         void __iomem *regbase;
91         unsigned long regsize;
92         struct resource *res;
93         int alarm_irq;
94         int periodic_irq;
95         int carry_irq;
96         struct rtc_device *rtc_dev;
97         spinlock_t lock;
98         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
99         unsigned short periodic_freq;
100 };
101
102 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
103 {
104         struct sh_rtc *rtc = dev_id;
105         unsigned int tmp;
106
107         spin_lock(&rtc->lock);
108
109         tmp = readb(rtc->regbase + RCR1);
110         tmp &= ~RCR1_CF;
111         writeb(tmp, rtc->regbase + RCR1);
112
113         /* Users have requested One x Second IRQ */
114         if (rtc->periodic_freq & PF_OXS)
115                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
116
117         spin_unlock(&rtc->lock);
118
119         return IRQ_HANDLED;
120 }
121
122 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
123 {
124         struct sh_rtc *rtc = dev_id;
125         unsigned int tmp;
126
127         spin_lock(&rtc->lock);
128
129         tmp = readb(rtc->regbase + RCR1);
130         tmp &= ~(RCR1_AF | RCR1_AIE);
131                 writeb(tmp, rtc->regbase + RCR1);
132
133         rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
134
135         spin_unlock(&rtc->lock);
136
137         return IRQ_HANDLED;
138 }
139
140 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
141 {
142         struct sh_rtc *rtc = dev_id;
143         struct rtc_device *rtc_dev = rtc->rtc_dev;
144         unsigned int tmp;
145
146         spin_lock(&rtc->lock);
147
148         tmp = readb(rtc->regbase + RCR2);
149         tmp &= ~RCR2_PEF;
150         writeb(tmp, rtc->regbase + RCR2);
151
152         /* Half period enabled than one skipped and the next notified */
153         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
154                 rtc->periodic_freq &= ~PF_COUNT;
155         else {
156                 if (rtc->periodic_freq & PF_HP)
157                         rtc->periodic_freq |= PF_COUNT;
158                 if (rtc->periodic_freq & PF_KOU) {
159                         spin_lock(&rtc_dev->irq_task_lock);
160                         if (rtc_dev->irq_task)
161                                 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
162                         spin_unlock(&rtc_dev->irq_task_lock);
163                 } else
164                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
165         }
166
167         spin_unlock(&rtc->lock);
168
169         return IRQ_HANDLED;
170 }
171
172 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
173 {
174         struct sh_rtc *rtc = dev_get_drvdata(dev);
175         unsigned int tmp;
176
177         spin_lock_irq(&rtc->lock);
178
179         tmp = readb(rtc->regbase + RCR2);
180
181         if (enable) {
182                 tmp &= ~RCR2_PEF;       /* Clear PES bit */
183                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
184         } else
185                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
186
187         writeb(tmp, rtc->regbase + RCR2);
188
189         spin_unlock_irq(&rtc->lock);
190 }
191
192 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
193 {
194         struct sh_rtc *rtc = dev_get_drvdata(dev);
195         int tmp, ret = 0;
196
197         spin_lock_irq(&rtc->lock);
198         tmp = rtc->periodic_freq & PF_MASK;
199
200         switch (freq) {
201         case 0:
202                 rtc->periodic_freq = 0x00;
203                 break;
204         case 1:
205                 rtc->periodic_freq = 0x60;
206                 break;
207         case 2:
208                 rtc->periodic_freq = 0x50;
209                 break;
210         case 4:
211                 rtc->periodic_freq = 0x40;
212                 break;
213         case 8:
214                 rtc->periodic_freq = 0x30 | PF_HP;
215                 break;
216         case 16:
217                 rtc->periodic_freq = 0x30;
218                 break;
219         case 32:
220                 rtc->periodic_freq = 0x20 | PF_HP;
221                 break;
222         case 64:
223                 rtc->periodic_freq = 0x20;
224                 break;
225         case 128:
226                 rtc->periodic_freq = 0x10 | PF_HP;
227                 break;
228         case 256:
229                 rtc->periodic_freq = 0x10;
230                 break;
231         default:
232                 ret = -ENOTSUPP;
233         }
234
235         if (ret == 0) {
236                 rtc->periodic_freq |= tmp;
237                 rtc->rtc_dev->irq_freq = freq;
238         }
239
240         spin_unlock_irq(&rtc->lock);
241         return ret;
242 }
243
244 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
245 {
246         struct sh_rtc *rtc = dev_get_drvdata(dev);
247         unsigned int tmp;
248
249         spin_lock_irq(&rtc->lock);
250
251         tmp = readb(rtc->regbase + RCR1);
252
253         if (!enable)
254                 tmp &= ~RCR1_AIE;
255         else
256                 tmp |= RCR1_AIE;
257
258         writeb(tmp, rtc->regbase + RCR1);
259
260         spin_unlock_irq(&rtc->lock);
261 }
262
263 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
264 {
265         struct sh_rtc *rtc = dev_get_drvdata(dev);
266         unsigned int tmp;
267
268         tmp = readb(rtc->regbase + RCR1);
269         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
270
271         tmp = readb(rtc->regbase + RCR2);
272         seq_printf(seq, "periodic_IRQ\t: %s\n",
273                    (tmp & RCR2_PESMASK) ? "yes" : "no");
274
275         return 0;
276 }
277
278 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
279 {
280         struct sh_rtc *rtc = dev_get_drvdata(dev);
281         unsigned int ret = 0;
282
283         switch (cmd) {
284         case RTC_PIE_OFF:
285         case RTC_PIE_ON:
286                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
287                 break;
288         case RTC_AIE_OFF:
289         case RTC_AIE_ON:
290                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
291                 break;
292         case RTC_UIE_OFF:
293                 rtc->periodic_freq &= ~PF_OXS;
294                 break;
295         case RTC_UIE_ON:
296                 rtc->periodic_freq |= PF_OXS;
297                 break;
298         case RTC_IRQP_READ:
299                 ret = put_user(rtc->rtc_dev->irq_freq,
300                                (unsigned long __user *)arg);
301                 break;
302         case RTC_IRQP_SET:
303                 ret = sh_rtc_setfreq(dev, arg);
304                 break;
305         default:
306                 ret = -ENOIOCTLCMD;
307         }
308
309         return ret;
310 }
311
312 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
313 {
314         struct platform_device *pdev = to_platform_device(dev);
315         struct sh_rtc *rtc = platform_get_drvdata(pdev);
316         unsigned int sec128, sec2, yr, yr100, cf_bit;
317
318         do {
319                 unsigned int tmp;
320
321                 spin_lock_irq(&rtc->lock);
322
323                 tmp = readb(rtc->regbase + RCR1);
324                 tmp &= ~RCR1_CF; /* Clear CF-bit */
325                 tmp |= RCR1_CIE;
326                 writeb(tmp, rtc->regbase + RCR1);
327
328                 sec128 = readb(rtc->regbase + R64CNT);
329
330                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
331                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
332                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
333                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
334                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
335                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
336
337                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
338                         yr  = readw(rtc->regbase + RYRCNT);
339                         yr100 = bcd2bin(yr >> 8);
340                         yr &= 0xff;
341                 } else {
342                         yr  = readb(rtc->regbase + RYRCNT);
343                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
344                 }
345
346                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
347
348                 sec2 = readb(rtc->regbase + R64CNT);
349                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
350
351                 spin_unlock_irq(&rtc->lock);
352         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
353
354 #if RTC_BIT_INVERTED != 0
355         if ((sec128 & RTC_BIT_INVERTED))
356                 tm->tm_sec--;
357 #endif
358
359         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
360                 "mday=%d, mon=%d, year=%d, wday=%d\n",
361                 __func__,
362                 tm->tm_sec, tm->tm_min, tm->tm_hour,
363                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
364
365         if (rtc_valid_tm(tm) < 0) {
366                 dev_err(dev, "invalid date\n");
367                 rtc_time_to_tm(0, tm);
368         }
369
370         return 0;
371 }
372
373 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
374 {
375         struct platform_device *pdev = to_platform_device(dev);
376         struct sh_rtc *rtc = platform_get_drvdata(pdev);
377         unsigned int tmp;
378         int year;
379
380         spin_lock_irq(&rtc->lock);
381
382         /* Reset pre-scaler & stop RTC */
383         tmp = readb(rtc->regbase + RCR2);
384         tmp |= RCR2_RESET;
385         tmp &= ~RCR2_START;
386         writeb(tmp, rtc->regbase + RCR2);
387
388         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
389         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
390         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
391         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
392         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
393         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
394
395         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
396                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
397                         bin2bcd(tm->tm_year % 100);
398                 writew(year, rtc->regbase + RYRCNT);
399         } else {
400                 year = tm->tm_year % 100;
401                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
402         }
403
404         /* Start RTC */
405         tmp = readb(rtc->regbase + RCR2);
406         tmp &= ~RCR2_RESET;
407         tmp |= RCR2_RTCEN | RCR2_START;
408         writeb(tmp, rtc->regbase + RCR2);
409
410         spin_unlock_irq(&rtc->lock);
411
412         return 0;
413 }
414
415 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
416 {
417         unsigned int byte;
418         int value = 0xff;       /* return 0xff for ignored values */
419
420         byte = readb(rtc->regbase + reg_off);
421         if (byte & AR_ENB) {
422                 byte &= ~AR_ENB;        /* strip the enable bit */
423                 value = bcd2bin(byte);
424         }
425
426         return value;
427 }
428
429 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
430 {
431         struct platform_device *pdev = to_platform_device(dev);
432         struct sh_rtc *rtc = platform_get_drvdata(pdev);
433         struct rtc_time *tm = &wkalrm->time;
434
435         spin_lock_irq(&rtc->lock);
436
437         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
438         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
439         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
440         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
441         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
442         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
443         if (tm->tm_mon > 0)
444                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
445         tm->tm_year     = 0xffff;
446
447         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
448
449         spin_unlock_irq(&rtc->lock);
450
451         return 0;
452 }
453
454 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
455                                             int value, int reg_off)
456 {
457         /* < 0 for a value that is ignored */
458         if (value < 0)
459                 writeb(0, rtc->regbase + reg_off);
460         else
461                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
462 }
463
464 static int sh_rtc_check_alarm(struct rtc_time *tm)
465 {
466         /*
467          * The original rtc says anything > 0xc0 is "don't care" or "match
468          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
469          * The original rtc doesn't support years - some things use -1 and
470          * some 0xffff. We use -1 to make out tests easier.
471          */
472         if (tm->tm_year == 0xffff)
473                 tm->tm_year = -1;
474         if (tm->tm_mon >= 0xff)
475                 tm->tm_mon = -1;
476         if (tm->tm_mday >= 0xff)
477                 tm->tm_mday = -1;
478         if (tm->tm_wday >= 0xff)
479                 tm->tm_wday = -1;
480         if (tm->tm_hour >= 0xff)
481                 tm->tm_hour = -1;
482         if (tm->tm_min >= 0xff)
483                 tm->tm_min = -1;
484         if (tm->tm_sec >= 0xff)
485                 tm->tm_sec = -1;
486
487         if (tm->tm_year > 9999 ||
488                 tm->tm_mon >= 12 ||
489                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
490                 tm->tm_wday >= 7 ||
491                 tm->tm_hour >= 24 ||
492                 tm->tm_min >= 60 ||
493                 tm->tm_sec >= 60)
494                 return -EINVAL;
495
496         return 0;
497 }
498
499 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
500 {
501         struct platform_device *pdev = to_platform_device(dev);
502         struct sh_rtc *rtc = platform_get_drvdata(pdev);
503         unsigned int rcr1;
504         struct rtc_time *tm = &wkalrm->time;
505         int mon, err;
506
507         err = sh_rtc_check_alarm(tm);
508         if (unlikely(err < 0))
509                 return err;
510
511         spin_lock_irq(&rtc->lock);
512
513         /* disable alarm interrupt and clear the alarm flag */
514         rcr1 = readb(rtc->regbase + RCR1);
515         rcr1 &= ~(RCR1_AF | RCR1_AIE);
516         writeb(rcr1, rtc->regbase + RCR1);
517
518         /* set alarm time */
519         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
520         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
521         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
522         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
523         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
524         mon = tm->tm_mon;
525         if (mon >= 0)
526                 mon += 1;
527         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
528
529         if (wkalrm->enabled) {
530                 rcr1 |= RCR1_AIE;
531                 writeb(rcr1, rtc->regbase + RCR1);
532         }
533
534         spin_unlock_irq(&rtc->lock);
535
536         return 0;
537 }
538
539 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
540 {
541         struct platform_device *pdev = to_platform_device(dev);
542         struct sh_rtc *rtc = platform_get_drvdata(pdev);
543
544         if (enabled) {
545                 rtc->periodic_freq |= PF_KOU;
546                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
547         } else {
548                 rtc->periodic_freq &= ~PF_KOU;
549                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
550         }
551 }
552
553 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
554 {
555         if (!is_power_of_2(freq))
556                 return -EINVAL;
557         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
558 }
559
560 static struct rtc_class_ops sh_rtc_ops = {
561         .ioctl          = sh_rtc_ioctl,
562         .read_time      = sh_rtc_read_time,
563         .set_time       = sh_rtc_set_time,
564         .read_alarm     = sh_rtc_read_alarm,
565         .set_alarm      = sh_rtc_set_alarm,
566         .irq_set_state  = sh_rtc_irq_set_state,
567         .irq_set_freq   = sh_rtc_irq_set_freq,
568         .proc           = sh_rtc_proc,
569 };
570
571 static int __devinit sh_rtc_probe(struct platform_device *pdev)
572 {
573         struct sh_rtc *rtc;
574         struct resource *res;
575         unsigned int tmp;
576         int ret;
577
578         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
579         if (unlikely(!rtc))
580                 return -ENOMEM;
581
582         spin_lock_init(&rtc->lock);
583
584         /* get periodic/carry/alarm irqs */
585         ret = platform_get_irq(pdev, 0);
586         if (unlikely(ret <= 0)) {
587                 ret = -ENOENT;
588                 dev_err(&pdev->dev, "No IRQ for period\n");
589                 goto err_badres;
590         }
591         rtc->periodic_irq = ret;
592
593         ret = platform_get_irq(pdev, 1);
594         if (unlikely(ret <= 0)) {
595                 ret = -ENOENT;
596                 dev_err(&pdev->dev, "No IRQ for carry\n");
597                 goto err_badres;
598         }
599         rtc->carry_irq = ret;
600
601         ret = platform_get_irq(pdev, 2);
602         if (unlikely(ret <= 0)) {
603                 ret = -ENOENT;
604                 dev_err(&pdev->dev, "No IRQ for alarm\n");
605                 goto err_badres;
606         }
607         rtc->alarm_irq = ret;
608
609         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
610         if (unlikely(res == NULL)) {
611                 ret = -ENOENT;
612                 dev_err(&pdev->dev, "No IO resource\n");
613                 goto err_badres;
614         }
615
616         rtc->regsize = res->end - res->start + 1;
617
618         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
619         if (unlikely(!rtc->res)) {
620                 ret = -EBUSY;
621                 goto err_badres;
622         }
623
624         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
625         if (unlikely(!rtc->regbase)) {
626                 ret = -EINVAL;
627                 goto err_badmap;
628         }
629
630         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
631                                            &sh_rtc_ops, THIS_MODULE);
632         if (IS_ERR(rtc->rtc_dev)) {
633                 ret = PTR_ERR(rtc->rtc_dev);
634                 goto err_unmap;
635         }
636
637         rtc->capabilities = RTC_DEF_CAPABILITIES;
638         if (pdev->dev.platform_data) {
639                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
640
641                 /*
642                  * Some CPUs have special capabilities in addition to the
643                  * default set. Add those in here.
644                  */
645                 rtc->capabilities |= pinfo->capabilities;
646         }
647
648         rtc->rtc_dev->max_user_freq = 256;
649         rtc->rtc_dev->irq_freq = 1;
650         rtc->periodic_freq = 0x60;
651
652         platform_set_drvdata(pdev, rtc);
653
654         /* register periodic/carry/alarm irqs */
655         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
656                           "sh-rtc period", rtc);
657         if (unlikely(ret)) {
658                 dev_err(&pdev->dev,
659                         "request period IRQ failed with %d, IRQ %d\n", ret,
660                         rtc->periodic_irq);
661                 goto err_unmap;
662         }
663
664         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
665                           "sh-rtc carry", rtc);
666         if (unlikely(ret)) {
667                 dev_err(&pdev->dev,
668                         "request carry IRQ failed with %d, IRQ %d\n", ret,
669                         rtc->carry_irq);
670                 free_irq(rtc->periodic_irq, rtc);
671                 goto err_unmap;
672         }
673
674         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
675                           "sh-rtc alarm", rtc);
676         if (unlikely(ret)) {
677                 dev_err(&pdev->dev,
678                         "request alarm IRQ failed with %d, IRQ %d\n", ret,
679                         rtc->alarm_irq);
680                 free_irq(rtc->carry_irq, rtc);
681                 free_irq(rtc->periodic_irq, rtc);
682                 goto err_unmap;
683         }
684
685         tmp = readb(rtc->regbase + RCR1);
686         tmp &= ~RCR1_CF;
687         tmp |= RCR1_CIE;
688         writeb(tmp, rtc->regbase + RCR1);
689
690         return 0;
691
692 err_unmap:
693         iounmap(rtc->regbase);
694 err_badmap:
695         release_resource(rtc->res);
696 err_badres:
697         kfree(rtc);
698
699         return ret;
700 }
701
702 static int __devexit sh_rtc_remove(struct platform_device *pdev)
703 {
704         struct sh_rtc *rtc = platform_get_drvdata(pdev);
705
706         if (likely(rtc->rtc_dev))
707                 rtc_device_unregister(rtc->rtc_dev);
708
709         sh_rtc_setpie(&pdev->dev, 0);
710         sh_rtc_setaie(&pdev->dev, 0);
711
712         free_irq(rtc->carry_irq, rtc);
713         free_irq(rtc->periodic_irq, rtc);
714         free_irq(rtc->alarm_irq, rtc);
715
716         release_resource(rtc->res);
717
718         iounmap(rtc->regbase);
719
720         platform_set_drvdata(pdev, NULL);
721
722         kfree(rtc);
723
724         return 0;
725 }
726 static struct platform_driver sh_rtc_platform_driver = {
727         .driver         = {
728                 .name   = DRV_NAME,
729                 .owner  = THIS_MODULE,
730         },
731         .probe          = sh_rtc_probe,
732         .remove         = __devexit_p(sh_rtc_remove),
733 };
734
735 static int __init sh_rtc_init(void)
736 {
737         return platform_driver_register(&sh_rtc_platform_driver);
738 }
739
740 static void __exit sh_rtc_exit(void)
741 {
742         platform_driver_unregister(&sh_rtc_platform_driver);
743 }
744
745 module_init(sh_rtc_init);
746 module_exit(sh_rtc_exit);
747
748 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
749 MODULE_VERSION(DRV_VERSION);
750 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
751               "Jamie Lenehan <lenehan@twibble.org>, "
752               "Angelo Castello <angelo.castello@st.com>");
753 MODULE_LICENSE("GPL");
754 MODULE_ALIAS("platform:" DRV_NAME);