Merge branch 'lpc32xx/dts' of git://git.antcom.de/linux-2.6 into next/dt
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / rtc / rtc-twl.c
1 /*
2  * rtc-twl.c -- TWL Real Time Clock interface
3  *
4  * Copyright (C) 2007 MontaVista Software, Inc
5  * Author: Alexandre Rusev <source@mvista.com>
6  *
7  * Based on original TI driver twl4030-rtc.c
8  *   Copyright (C) 2006 Texas Instruments, Inc.
9  *
10  * Based on rtc-omap.c
11  *   Copyright (C) 2003 MontaVista Software, Inc.
12  *   Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
13  *   Copyright (C) 2006 David Brownell
14  *
15  * This program is free software; you can redistribute it and/or
16  * modify it under the terms of the GNU General Public License
17  * as published by the Free Software Foundation; either version
18  * 2 of the License, or (at your option) any later version.
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/rtc.h>
27 #include <linux/bcd.h>
28 #include <linux/platform_device.h>
29 #include <linux/interrupt.h>
30
31 #include <linux/i2c/twl.h>
32
33
34 /*
35  * RTC block register offsets (use TWL_MODULE_RTC)
36  */
37 enum {
38         REG_SECONDS_REG = 0,
39         REG_MINUTES_REG,
40         REG_HOURS_REG,
41         REG_DAYS_REG,
42         REG_MONTHS_REG,
43         REG_YEARS_REG,
44         REG_WEEKS_REG,
45
46         REG_ALARM_SECONDS_REG,
47         REG_ALARM_MINUTES_REG,
48         REG_ALARM_HOURS_REG,
49         REG_ALARM_DAYS_REG,
50         REG_ALARM_MONTHS_REG,
51         REG_ALARM_YEARS_REG,
52
53         REG_RTC_CTRL_REG,
54         REG_RTC_STATUS_REG,
55         REG_RTC_INTERRUPTS_REG,
56
57         REG_RTC_COMP_LSB_REG,
58         REG_RTC_COMP_MSB_REG,
59 };
60 static const u8 twl4030_rtc_reg_map[] = {
61         [REG_SECONDS_REG] = 0x00,
62         [REG_MINUTES_REG] = 0x01,
63         [REG_HOURS_REG] = 0x02,
64         [REG_DAYS_REG] = 0x03,
65         [REG_MONTHS_REG] = 0x04,
66         [REG_YEARS_REG] = 0x05,
67         [REG_WEEKS_REG] = 0x06,
68
69         [REG_ALARM_SECONDS_REG] = 0x07,
70         [REG_ALARM_MINUTES_REG] = 0x08,
71         [REG_ALARM_HOURS_REG] = 0x09,
72         [REG_ALARM_DAYS_REG] = 0x0A,
73         [REG_ALARM_MONTHS_REG] = 0x0B,
74         [REG_ALARM_YEARS_REG] = 0x0C,
75
76         [REG_RTC_CTRL_REG] = 0x0D,
77         [REG_RTC_STATUS_REG] = 0x0E,
78         [REG_RTC_INTERRUPTS_REG] = 0x0F,
79
80         [REG_RTC_COMP_LSB_REG] = 0x10,
81         [REG_RTC_COMP_MSB_REG] = 0x11,
82 };
83 static const u8 twl6030_rtc_reg_map[] = {
84         [REG_SECONDS_REG] = 0x00,
85         [REG_MINUTES_REG] = 0x01,
86         [REG_HOURS_REG] = 0x02,
87         [REG_DAYS_REG] = 0x03,
88         [REG_MONTHS_REG] = 0x04,
89         [REG_YEARS_REG] = 0x05,
90         [REG_WEEKS_REG] = 0x06,
91
92         [REG_ALARM_SECONDS_REG] = 0x08,
93         [REG_ALARM_MINUTES_REG] = 0x09,
94         [REG_ALARM_HOURS_REG] = 0x0A,
95         [REG_ALARM_DAYS_REG] = 0x0B,
96         [REG_ALARM_MONTHS_REG] = 0x0C,
97         [REG_ALARM_YEARS_REG] = 0x0D,
98
99         [REG_RTC_CTRL_REG] = 0x10,
100         [REG_RTC_STATUS_REG] = 0x11,
101         [REG_RTC_INTERRUPTS_REG] = 0x12,
102
103         [REG_RTC_COMP_LSB_REG] = 0x13,
104         [REG_RTC_COMP_MSB_REG] = 0x14,
105 };
106
107 /* RTC_CTRL_REG bitfields */
108 #define BIT_RTC_CTRL_REG_STOP_RTC_M              0x01
109 #define BIT_RTC_CTRL_REG_ROUND_30S_M             0x02
110 #define BIT_RTC_CTRL_REG_AUTO_COMP_M             0x04
111 #define BIT_RTC_CTRL_REG_MODE_12_24_M            0x08
112 #define BIT_RTC_CTRL_REG_TEST_MODE_M             0x10
113 #define BIT_RTC_CTRL_REG_SET_32_COUNTER_M        0x20
114 #define BIT_RTC_CTRL_REG_GET_TIME_M              0x40
115 #define BIT_RTC_CTRL_REG_RTC_V_OPT               0x80
116
117 /* RTC_STATUS_REG bitfields */
118 #define BIT_RTC_STATUS_REG_RUN_M                 0x02
119 #define BIT_RTC_STATUS_REG_1S_EVENT_M            0x04
120 #define BIT_RTC_STATUS_REG_1M_EVENT_M            0x08
121 #define BIT_RTC_STATUS_REG_1H_EVENT_M            0x10
122 #define BIT_RTC_STATUS_REG_1D_EVENT_M            0x20
123 #define BIT_RTC_STATUS_REG_ALARM_M               0x40
124 #define BIT_RTC_STATUS_REG_POWER_UP_M            0x80
125
126 /* RTC_INTERRUPTS_REG bitfields */
127 #define BIT_RTC_INTERRUPTS_REG_EVERY_M           0x03
128 #define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M        0x04
129 #define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M        0x08
130
131
132 /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
133 #define ALL_TIME_REGS           6
134
135 /*----------------------------------------------------------------------*/
136 static u8  *rtc_reg_map;
137
138 /*
139  * Supports 1 byte read from TWL RTC register.
140  */
141 static int twl_rtc_read_u8(u8 *data, u8 reg)
142 {
143         int ret;
144
145         ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
146         if (ret < 0)
147                 pr_err("twl_rtc: Could not read TWL"
148                        "register %X - error %d\n", reg, ret);
149         return ret;
150 }
151
152 /*
153  * Supports 1 byte write to TWL RTC registers.
154  */
155 static int twl_rtc_write_u8(u8 data, u8 reg)
156 {
157         int ret;
158
159         ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
160         if (ret < 0)
161                 pr_err("twl_rtc: Could not write TWL"
162                        "register %X - error %d\n", reg, ret);
163         return ret;
164 }
165
166 /*
167  * Cache the value for timer/alarm interrupts register; this is
168  * only changed by callers holding rtc ops lock (or resume).
169  */
170 static unsigned char rtc_irq_bits;
171
172 /*
173  * Enable 1/second update and/or alarm interrupts.
174  */
175 static int set_rtc_irq_bit(unsigned char bit)
176 {
177         unsigned char val;
178         int ret;
179
180         /* if the bit is set, return from here */
181         if (rtc_irq_bits & bit)
182                 return 0;
183
184         val = rtc_irq_bits | bit;
185         val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
186         ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
187         if (ret == 0)
188                 rtc_irq_bits = val;
189
190         return ret;
191 }
192
193 /*
194  * Disable update and/or alarm interrupts.
195  */
196 static int mask_rtc_irq_bit(unsigned char bit)
197 {
198         unsigned char val;
199         int ret;
200
201         /* if the bit is clear, return from here */
202         if (!(rtc_irq_bits & bit))
203                 return 0;
204
205         val = rtc_irq_bits & ~bit;
206         ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
207         if (ret == 0)
208                 rtc_irq_bits = val;
209
210         return ret;
211 }
212
213 static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
214 {
215         int ret;
216
217         if (enabled)
218                 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
219         else
220                 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
221
222         return ret;
223 }
224
225 /*
226  * Gets current TWL RTC time and date parameters.
227  *
228  * The RTC's time/alarm representation is not what gmtime(3) requires
229  * Linux to use:
230  *
231  *  - Months are 1..12 vs Linux 0-11
232  *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
233  */
234 static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
235 {
236         unsigned char rtc_data[ALL_TIME_REGS + 1];
237         int ret;
238         u8 save_control;
239         u8 rtc_control;
240
241         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
242         if (ret < 0) {
243                 dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
244                 return ret;
245         }
246         /* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
247         if (twl_class_is_6030()) {
248                 if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
249                         save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
250                         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
251                         if (ret < 0) {
252                                 dev_err(dev, "%s clr GET_TIME, error %d\n",
253                                         __func__, ret);
254                                 return ret;
255                         }
256                 }
257         }
258
259         /* Copy RTC counting registers to static registers or latches */
260         rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
261
262         /* for twl6030/32 enable read access to static shadowed registers */
263         if (twl_class_is_6030())
264                 rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
265
266         ret = twl_rtc_write_u8(rtc_control, REG_RTC_CTRL_REG);
267         if (ret < 0) {
268                 dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
269                 return ret;
270         }
271
272         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
273                         (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
274
275         if (ret < 0) {
276                 dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
277                 return ret;
278         }
279
280         /* for twl6030 restore original state of rtc control register */
281         if (twl_class_is_6030()) {
282                 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
283                 if (ret < 0) {
284                         dev_err(dev, "%s: restore CTRL_REG, error %d\n",
285                                 __func__, ret);
286                         return ret;
287                 }
288         }
289
290         tm->tm_sec = bcd2bin(rtc_data[0]);
291         tm->tm_min = bcd2bin(rtc_data[1]);
292         tm->tm_hour = bcd2bin(rtc_data[2]);
293         tm->tm_mday = bcd2bin(rtc_data[3]);
294         tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
295         tm->tm_year = bcd2bin(rtc_data[5]) + 100;
296
297         return ret;
298 }
299
300 static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
301 {
302         unsigned char save_control;
303         unsigned char rtc_data[ALL_TIME_REGS + 1];
304         int ret;
305
306         rtc_data[1] = bin2bcd(tm->tm_sec);
307         rtc_data[2] = bin2bcd(tm->tm_min);
308         rtc_data[3] = bin2bcd(tm->tm_hour);
309         rtc_data[4] = bin2bcd(tm->tm_mday);
310         rtc_data[5] = bin2bcd(tm->tm_mon + 1);
311         rtc_data[6] = bin2bcd(tm->tm_year - 100);
312
313         /* Stop RTC while updating the TC registers */
314         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
315         if (ret < 0)
316                 goto out;
317
318         save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
319         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
320         if (ret < 0)
321                 goto out;
322
323         /* update all the time registers in one shot */
324         ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
325                 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
326         if (ret < 0) {
327                 dev_err(dev, "rtc_set_time error %d\n", ret);
328                 goto out;
329         }
330
331         /* Start back RTC */
332         save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
333         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
334
335 out:
336         return ret;
337 }
338
339 /*
340  * Gets current TWL RTC alarm time.
341  */
342 static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
343 {
344         unsigned char rtc_data[ALL_TIME_REGS + 1];
345         int ret;
346
347         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
348                         (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
349         if (ret < 0) {
350                 dev_err(dev, "rtc_read_alarm error %d\n", ret);
351                 return ret;
352         }
353
354         /* some of these fields may be wildcard/"match all" */
355         alm->time.tm_sec = bcd2bin(rtc_data[0]);
356         alm->time.tm_min = bcd2bin(rtc_data[1]);
357         alm->time.tm_hour = bcd2bin(rtc_data[2]);
358         alm->time.tm_mday = bcd2bin(rtc_data[3]);
359         alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
360         alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
361
362         /* report cached alarm enable state */
363         if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
364                 alm->enabled = 1;
365
366         return ret;
367 }
368
369 static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
370 {
371         unsigned char alarm_data[ALL_TIME_REGS + 1];
372         int ret;
373
374         ret = twl_rtc_alarm_irq_enable(dev, 0);
375         if (ret)
376                 goto out;
377
378         alarm_data[1] = bin2bcd(alm->time.tm_sec);
379         alarm_data[2] = bin2bcd(alm->time.tm_min);
380         alarm_data[3] = bin2bcd(alm->time.tm_hour);
381         alarm_data[4] = bin2bcd(alm->time.tm_mday);
382         alarm_data[5] = bin2bcd(alm->time.tm_mon + 1);
383         alarm_data[6] = bin2bcd(alm->time.tm_year - 100);
384
385         /* update all the alarm registers in one shot */
386         ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
387                 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
388         if (ret) {
389                 dev_err(dev, "rtc_set_alarm error %d\n", ret);
390                 goto out;
391         }
392
393         if (alm->enabled)
394                 ret = twl_rtc_alarm_irq_enable(dev, 1);
395 out:
396         return ret;
397 }
398
399 static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
400 {
401         unsigned long events;
402         int ret = IRQ_NONE;
403         int res;
404         u8 rd_reg;
405
406         res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
407         if (res)
408                 goto out;
409         /*
410          * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
411          * only one (ALARM or RTC) interrupt source may be enabled
412          * at time, we also could check our results
413          * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
414          */
415         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
416                 events = RTC_IRQF | RTC_AF;
417         else
418                 events = RTC_IRQF | RTC_PF;
419
420         res = twl_rtc_write_u8(BIT_RTC_STATUS_REG_ALARM_M,
421                                    REG_RTC_STATUS_REG);
422         if (res)
423                 goto out;
424
425         if (twl_class_is_4030()) {
426                 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
427                  * needs 2 reads to clear the interrupt. One read is done in
428                  * do_twl_pwrirq(). Doing the second read, to clear
429                  * the bit.
430                  *
431                  * FIXME the reason PWR_ISR1 needs an extra read is that
432                  * RTC_IF retriggered until we cleared REG_ALARM_M above.
433                  * But re-reading like this is a bad hack; by doing so we
434                  * risk wrongly clearing status for some other IRQ (losing
435                  * the interrupt).  Be smarter about handling RTC_UF ...
436                  */
437                 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
438                         &rd_reg, TWL4030_INT_PWR_ISR1);
439                 if (res)
440                         goto out;
441         }
442
443         /* Notify RTC core on event */
444         rtc_update_irq(rtc, 1, events);
445
446         ret = IRQ_HANDLED;
447 out:
448         return ret;
449 }
450
451 static struct rtc_class_ops twl_rtc_ops = {
452         .read_time      = twl_rtc_read_time,
453         .set_time       = twl_rtc_set_time,
454         .read_alarm     = twl_rtc_read_alarm,
455         .set_alarm      = twl_rtc_set_alarm,
456         .alarm_irq_enable = twl_rtc_alarm_irq_enable,
457 };
458
459 /*----------------------------------------------------------------------*/
460
461 static int __devinit twl_rtc_probe(struct platform_device *pdev)
462 {
463         struct rtc_device *rtc;
464         int ret = -EINVAL;
465         int irq = platform_get_irq(pdev, 0);
466         u8 rd_reg;
467
468         if (irq <= 0)
469                 goto out1;
470
471         ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
472         if (ret < 0)
473                 goto out1;
474
475         if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
476                 dev_warn(&pdev->dev, "Power up reset detected.\n");
477
478         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
479                 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
480
481         /* Clear RTC Power up reset and pending alarm interrupts */
482         ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
483         if (ret < 0)
484                 goto out1;
485
486         if (twl_class_is_6030()) {
487                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
488                         REG_INT_MSK_LINE_A);
489                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
490                         REG_INT_MSK_STS_A);
491         }
492
493         dev_info(&pdev->dev, "Enabling TWL-RTC\n");
494         ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
495         if (ret < 0)
496                 goto out1;
497
498         /* init cached IRQ enable bits */
499         ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
500         if (ret < 0)
501                 goto out1;
502
503         rtc = rtc_device_register(pdev->name,
504                                   &pdev->dev, &twl_rtc_ops, THIS_MODULE);
505         if (IS_ERR(rtc)) {
506                 ret = PTR_ERR(rtc);
507                 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
508                         PTR_ERR(rtc));
509                 goto out1;
510         }
511
512         ret = request_threaded_irq(irq, NULL, twl_rtc_interrupt,
513                                    IRQF_TRIGGER_RISING | IRQF_ONESHOT,
514                                    dev_name(&rtc->dev), rtc);
515         if (ret < 0) {
516                 dev_err(&pdev->dev, "IRQ is not free.\n");
517                 goto out2;
518         }
519
520         platform_set_drvdata(pdev, rtc);
521         return 0;
522
523 out2:
524         rtc_device_unregister(rtc);
525 out1:
526         return ret;
527 }
528
529 /*
530  * Disable all TWL RTC module interrupts.
531  * Sets status flag to free.
532  */
533 static int __devexit twl_rtc_remove(struct platform_device *pdev)
534 {
535         /* leave rtc running, but disable irqs */
536         struct rtc_device *rtc = platform_get_drvdata(pdev);
537         int irq = platform_get_irq(pdev, 0);
538
539         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
540         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
541         if (twl_class_is_6030()) {
542                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
543                         REG_INT_MSK_LINE_A);
544                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
545                         REG_INT_MSK_STS_A);
546         }
547
548
549         free_irq(irq, rtc);
550
551         rtc_device_unregister(rtc);
552         platform_set_drvdata(pdev, NULL);
553         return 0;
554 }
555
556 static void twl_rtc_shutdown(struct platform_device *pdev)
557 {
558         /* mask timer interrupts, but leave alarm interrupts on to enable
559            power-on when alarm is triggered */
560         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
561 }
562
563 #ifdef CONFIG_PM
564
565 static unsigned char irqstat;
566
567 static int twl_rtc_suspend(struct platform_device *pdev, pm_message_t state)
568 {
569         irqstat = rtc_irq_bits;
570
571         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
572         return 0;
573 }
574
575 static int twl_rtc_resume(struct platform_device *pdev)
576 {
577         set_rtc_irq_bit(irqstat);
578         return 0;
579 }
580
581 #else
582 #define twl_rtc_suspend NULL
583 #define twl_rtc_resume  NULL
584 #endif
585
586 static const struct of_device_id twl_rtc_of_match[] = {
587         {.compatible = "ti,twl4030-rtc", },
588         { },
589 };
590 MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
591 MODULE_ALIAS("platform:twl_rtc");
592
593 static struct platform_driver twl4030rtc_driver = {
594         .probe          = twl_rtc_probe,
595         .remove         = __devexit_p(twl_rtc_remove),
596         .shutdown       = twl_rtc_shutdown,
597         .suspend        = twl_rtc_suspend,
598         .resume         = twl_rtc_resume,
599         .driver         = {
600                 .owner          = THIS_MODULE,
601                 .name           = "twl_rtc",
602                 .of_match_table = twl_rtc_of_match,
603         },
604 };
605
606 static int __init twl_rtc_init(void)
607 {
608         if (twl_class_is_4030())
609                 rtc_reg_map = (u8 *) twl4030_rtc_reg_map;
610         else
611                 rtc_reg_map = (u8 *) twl6030_rtc_reg_map;
612
613         return platform_driver_register(&twl4030rtc_driver);
614 }
615 module_init(twl_rtc_init);
616
617 static void __exit twl_rtc_exit(void)
618 {
619         platform_driver_unregister(&twl4030rtc_driver);
620 }
621 module_exit(twl_rtc_exit);
622
623 MODULE_AUTHOR("Texas Instruments, MontaVista Software");
624 MODULE_LICENSE("GPL");