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 #include <linux/of.h>
  31
  32 #include <linux/i2c/twl.h>
  33
  34
  35 /*
  36  * RTC block register offsets (use TWL_MODULE_RTC)
  37  */
  38 enum {
  39         REG_SECONDS_REG = 0,
  40         REG_MINUTES_REG,
  41         REG_HOURS_REG,
  42         REG_DAYS_REG,
  43         REG_MONTHS_REG,
  44         REG_YEARS_REG,
  45         REG_WEEKS_REG,
  46
  47         REG_ALARM_SECONDS_REG,
  48         REG_ALARM_MINUTES_REG,
  49         REG_ALARM_HOURS_REG,
  50         REG_ALARM_DAYS_REG,
  51         REG_ALARM_MONTHS_REG,
  52         REG_ALARM_YEARS_REG,
  53
  54         REG_RTC_CTRL_REG,
  55         REG_RTC_STATUS_REG,
  56         REG_RTC_INTERRUPTS_REG,
  57
  58         REG_RTC_COMP_LSB_REG,
  59         REG_RTC_COMP_MSB_REG,
  60 };
  61 static const u8 twl4030_rtc_reg_map[] = {
  62         [REG_SECONDS_REG] = 0x00,
  63         [REG_MINUTES_REG] = 0x01,
  64         [REG_HOURS_REG] = 0x02,
  65         [REG_DAYS_REG] = 0x03,
  66         [REG_MONTHS_REG] = 0x04,
  67         [REG_YEARS_REG] = 0x05,
  68         [REG_WEEKS_REG] = 0x06,
  69
  70         [REG_ALARM_SECONDS_REG] = 0x07,
  71         [REG_ALARM_MINUTES_REG] = 0x08,
  72         [REG_ALARM_HOURS_REG] = 0x09,
  73         [REG_ALARM_DAYS_REG] = 0x0A,
  74         [REG_ALARM_MONTHS_REG] = 0x0B,
  75         [REG_ALARM_YEARS_REG] = 0x0C,
  76
  77         [REG_RTC_CTRL_REG] = 0x0D,
  78         [REG_RTC_STATUS_REG] = 0x0E,
  79         [REG_RTC_INTERRUPTS_REG] = 0x0F,
  80
  81         [REG_RTC_COMP_LSB_REG] = 0x10,
  82         [REG_RTC_COMP_MSB_REG] = 0x11,
  83 };
  84 static const u8 twl6030_rtc_reg_map[] = {
  85         [REG_SECONDS_REG] = 0x00,
  86         [REG_MINUTES_REG] = 0x01,
  87         [REG_HOURS_REG] = 0x02,
  88         [REG_DAYS_REG] = 0x03,
  89         [REG_MONTHS_REG] = 0x04,
  90         [REG_YEARS_REG] = 0x05,
  91         [REG_WEEKS_REG] = 0x06,
  92
  93         [REG_ALARM_SECONDS_REG] = 0x08,
  94         [REG_ALARM_MINUTES_REG] = 0x09,
  95         [REG_ALARM_HOURS_REG] = 0x0A,
  96         [REG_ALARM_DAYS_REG] = 0x0B,
  97         [REG_ALARM_MONTHS_REG] = 0x0C,
  98         [REG_ALARM_YEARS_REG] = 0x0D,
  99
 100         [REG_RTC_CTRL_REG] = 0x10,
 101         [REG_RTC_STATUS_REG] = 0x11,
 102         [REG_RTC_INTERRUPTS_REG] = 0x12,
 103
 104         [REG_RTC_COMP_LSB_REG] = 0x13,
 105         [REG_RTC_COMP_MSB_REG] = 0x14,
 106 };
 107
 108 /* RTC_CTRL_REG bitfields */
 109 #define BIT_RTC_CTRL_REG_STOP_RTC_M              0x01
 110 #define BIT_RTC_CTRL_REG_ROUND_30S_M             0x02
 111 #define BIT_RTC_CTRL_REG_AUTO_COMP_M             0x04
 112 #define BIT_RTC_CTRL_REG_MODE_12_24_M            0x08
 113 #define BIT_RTC_CTRL_REG_TEST_MODE_M             0x10
 114 #define BIT_RTC_CTRL_REG_SET_32_COUNTER_M        0x20
 115 #define BIT_RTC_CTRL_REG_GET_TIME_M              0x40
 116 #define BIT_RTC_CTRL_REG_RTC_V_OPT               0x80
 117
 118 /* RTC_STATUS_REG bitfields */
 119 #define BIT_RTC_STATUS_REG_RUN_M                 0x02
 120 #define BIT_RTC_STATUS_REG_1S_EVENT_M            0x04
 121 #define BIT_RTC_STATUS_REG_1M_EVENT_M            0x08
 122 #define BIT_RTC_STATUS_REG_1H_EVENT_M            0x10
 123 #define BIT_RTC_STATUS_REG_1D_EVENT_M            0x20
 124 #define BIT_RTC_STATUS_REG_ALARM_M               0x40
 125 #define BIT_RTC_STATUS_REG_POWER_UP_M            0x80
 126
 127 /* RTC_INTERRUPTS_REG bitfields */
 128 #define BIT_RTC_INTERRUPTS_REG_EVERY_M           0x03
 129 #define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M        0x04
 130 #define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M        0x08
 131
 132
 133 /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
 134 #define ALL_TIME_REGS           6
 135
 136 /*----------------------------------------------------------------------*/
 137 static u8  *rtc_reg_map;
 138
 139 /*
 140  * Supports 1 byte read from TWL RTC register.
 141  */
 142 static int twl_rtc_read_u8(u8 *data, u8 reg)
 143 {
 144         int ret;
 145
 146         ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
 147         if (ret < 0)
 148                 pr_err("twl_rtc: Could not read TWL"
 149                        "register %X - error %d\n", reg, ret);
 150         return ret;
 151 }
 152
 153 /*
 154  * Supports 1 byte write to TWL RTC registers.
 155  */
 156 static int twl_rtc_write_u8(u8 data, u8 reg)
 157 {
 158         int ret;
 159
 160         ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
 161         if (ret < 0)
 162                 pr_err("twl_rtc: Could not write TWL"
 163                        "register %X - error %d\n", reg, ret);
 164         return ret;
 165 }
 166
 167 /*
 168  * Cache the value for timer/alarm interrupts register; this is
 169  * only changed by callers holding rtc ops lock (or resume).
 170  */
 171 static unsigned char rtc_irq_bits;
 172
 173 /*
 174  * Enable 1/second update and/or alarm interrupts.
 175  */
 176 static int set_rtc_irq_bit(unsigned char bit)
 177 {
 178         unsigned char val;
 179         int ret;
 180
 181         /* if the bit is set, return from here */
 182         if (rtc_irq_bits & bit)
 183                 return 0;
 184
 185         val = rtc_irq_bits | bit;
 186         val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
 187         ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
 188         if (ret == 0)
 189                 rtc_irq_bits = val;
 190
 191         return ret;
 192 }
 193
 194 /*
 195  * Disable update and/or alarm interrupts.
 196  */
 197 static int mask_rtc_irq_bit(unsigned char bit)
 198 {
 199         unsigned char val;
 200         int ret;
 201
 202         /* if the bit is clear, return from here */
 203         if (!(rtc_irq_bits & bit))
 204                 return 0;
 205
 206         val = rtc_irq_bits & ~bit;
 207         ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
 208         if (ret == 0)
 209                 rtc_irq_bits = val;
 210
 211         return ret;
 212 }
 213
 214 static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
 215 {
 216         int ret;
 217
 218         if (enabled)
 219                 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 220         else
 221                 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 222
 223         return ret;
 224 }
 225
 226 /*
 227  * Gets current TWL RTC time and date parameters.
 228  *
 229  * The RTC's time/alarm representation is not what gmtime(3) requires
 230  * Linux to use:
 231  *
 232  *  - Months are 1..12 vs Linux 0-11
 233  *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
 234  */
 235 static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
 236 {
 237         unsigned char rtc_data[ALL_TIME_REGS];
 238         int ret;
 239         u8 save_control;
 240         u8 rtc_control;
 241
 242         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
 243         if (ret < 0) {
 244                 dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
 245                 return ret;
 246         }
 247         /* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
 248         if (twl_class_is_6030()) {
 249                 if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
 250                         save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
 251                         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 252                         if (ret < 0) {
 253                                 dev_err(dev, "%s clr GET_TIME, error %d\n",
 254                                         __func__, ret);
 255                                 return ret;
 256                         }
 257                 }
 258         }
 259
 260         /* Copy RTC counting registers to static registers or latches */
 261         rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
 262
 263         /* for twl6030/32 enable read access to static shadowed registers */
 264         if (twl_class_is_6030())
 265                 rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
 266
 267         ret = twl_rtc_write_u8(rtc_control, REG_RTC_CTRL_REG);
 268         if (ret < 0) {
 269                 dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
 270                 return ret;
 271         }
 272
 273         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
 274                         (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 275
 276         if (ret < 0) {
 277                 dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
 278                 return ret;
 279         }
 280
 281         /* for twl6030 restore original state of rtc control register */
 282         if (twl_class_is_6030()) {
 283                 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 284                 if (ret < 0) {
 285                         dev_err(dev, "%s: restore CTRL_REG, error %d\n",
 286                                 __func__, ret);
 287                         return ret;
 288                 }
 289         }
 290
 291         tm->tm_sec = bcd2bin(rtc_data[0]);
 292         tm->tm_min = bcd2bin(rtc_data[1]);
 293         tm->tm_hour = bcd2bin(rtc_data[2]);
 294         tm->tm_mday = bcd2bin(rtc_data[3]);
 295         tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
 296         tm->tm_year = bcd2bin(rtc_data[5]) + 100;
 297
 298         return ret;
 299 }
 300
 301 static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
 302 {
 303         unsigned char save_control;
 304         unsigned char rtc_data[ALL_TIME_REGS];
 305         int ret;
 306
 307         rtc_data[0] = bin2bcd(tm->tm_sec);
 308         rtc_data[1] = bin2bcd(tm->tm_min);
 309         rtc_data[2] = bin2bcd(tm->tm_hour);
 310         rtc_data[3] = bin2bcd(tm->tm_mday);
 311         rtc_data[4] = bin2bcd(tm->tm_mon + 1);
 312         rtc_data[5] = bin2bcd(tm->tm_year - 100);
 313
 314         /* Stop RTC while updating the TC registers */
 315         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
 316         if (ret < 0)
 317                 goto out;
 318
 319         save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
 320         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 321         if (ret < 0)
 322                 goto out;
 323
 324         /* update all the time registers in one shot */
 325         ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
 326                 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 327         if (ret < 0) {
 328                 dev_err(dev, "rtc_set_time error %d\n", ret);
 329                 goto out;
 330         }
 331
 332         /* Start back RTC */
 333         save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
 334         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 335
 336 out:
 337         return ret;
 338 }
 339
 340 /*
 341  * Gets current TWL RTC alarm time.
 342  */
 343 static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 344 {
 345         unsigned char rtc_data[ALL_TIME_REGS];
 346         int ret;
 347
 348         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
 349                         (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
 350         if (ret < 0) {
 351                 dev_err(dev, "rtc_read_alarm error %d\n", ret);
 352                 return ret;
 353         }
 354
 355         /* some of these fields may be wildcard/"match all" */
 356         alm->time.tm_sec = bcd2bin(rtc_data[0]);
 357         alm->time.tm_min = bcd2bin(rtc_data[1]);
 358         alm->time.tm_hour = bcd2bin(rtc_data[2]);
 359         alm->time.tm_mday = bcd2bin(rtc_data[3]);
 360         alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
 361         alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
 362
 363         /* report cached alarm enable state */
 364         if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
 365                 alm->enabled = 1;
 366
 367         return ret;
 368 }
 369
 370 static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 371 {
 372         unsigned char alarm_data[ALL_TIME_REGS];
 373         int ret;
 374
 375         ret = twl_rtc_alarm_irq_enable(dev, 0);
 376         if (ret)
 377                 goto out;
 378
 379         alarm_data[0] = bin2bcd(alm->time.tm_sec);
 380         alarm_data[1] = bin2bcd(alm->time.tm_min);
 381         alarm_data[2] = bin2bcd(alm->time.tm_hour);
 382         alarm_data[3] = bin2bcd(alm->time.tm_mday);
 383         alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
 384         alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
 385
 386         /* update all the alarm registers in one shot */
 387         ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
 388                 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
 389         if (ret) {
 390                 dev_err(dev, "rtc_set_alarm error %d\n", ret);
 391                 goto out;
 392         }
 393
 394         if (alm->enabled)
 395                 ret = twl_rtc_alarm_irq_enable(dev, 1);
 396 out:
 397         return ret;
 398 }
 399
 400 static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
 401 {
 402         unsigned long events;
 403         int ret = IRQ_NONE;
 404         int res;
 405         u8 rd_reg;
 406
 407         res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 408         if (res)
 409                 goto out;
 410         /*
 411          * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
 412          * only one (ALARM or RTC) interrupt source may be enabled
 413          * at time, we also could check our results
 414          * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
 415          */
 416         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
 417                 events = RTC_IRQF | RTC_AF;
 418         else
 419                 events = RTC_IRQF | RTC_PF;
 420
 421         res = twl_rtc_write_u8(BIT_RTC_STATUS_REG_ALARM_M,
 422                                    REG_RTC_STATUS_REG);
 423         if (res)
 424                 goto out;
 425
 426         if (twl_class_is_4030()) {
 427                 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
 428                  * needs 2 reads to clear the interrupt. One read is done in
 429                  * do_twl_pwrirq(). Doing the second read, to clear
 430                  * the bit.
 431                  *
 432                  * FIXME the reason PWR_ISR1 needs an extra read is that
 433                  * RTC_IF retriggered until we cleared REG_ALARM_M above.
 434                  * But re-reading like this is a bad hack; by doing so we
 435                  * risk wrongly clearing status for some other IRQ (losing
 436                  * the interrupt).  Be smarter about handling RTC_UF ...
 437                  */
 438                 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
 439                         &rd_reg, TWL4030_INT_PWR_ISR1);
 440                 if (res)
 441                         goto out;
 442         }
 443
 444         /* Notify RTC core on event */
 445         rtc_update_irq(rtc, 1, events);
 446
 447         ret = IRQ_HANDLED;
 448 out:
 449         return ret;
 450 }
 451
 452 static struct rtc_class_ops twl_rtc_ops = {
 453         .read_time      = twl_rtc_read_time,
 454         .set_time       = twl_rtc_set_time,
 455         .read_alarm     = twl_rtc_read_alarm,
 456         .set_alarm      = twl_rtc_set_alarm,
 457         .alarm_irq_enable = twl_rtc_alarm_irq_enable,
 458 };
 459
 460 /*----------------------------------------------------------------------*/
 461
 462 static int twl_rtc_probe(struct platform_device *pdev)
 463 {
 464         struct rtc_device *rtc;
 465         int ret = -EINVAL;
 466         int irq = platform_get_irq(pdev, 0);
 467         u8 rd_reg;
 468
 469         if (irq <= 0)
 470                 goto out1;
 471
 472         ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 473         if (ret < 0)
 474                 goto out1;
 475
 476         if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
 477                 dev_warn(&pdev->dev, "Power up reset detected.\n");
 478
 479         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
 480                 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
 481
 482         /* Clear RTC Power up reset and pending alarm interrupts */
 483         ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
 484         if (ret < 0)
 485                 goto out1;
 486
 487         if (twl_class_is_6030()) {
 488                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
 489                         REG_INT_MSK_LINE_A);
 490                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
 491                         REG_INT_MSK_STS_A);
 492         }
 493
 494         dev_info(&pdev->dev, "Enabling TWL-RTC\n");
 495         ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
 496         if (ret < 0)
 497                 goto out1;
 498
 499         /* ensure interrupts are disabled, bootloaders can be strange */
 500         ret = twl_rtc_write_u8(0, REG_RTC_INTERRUPTS_REG);
 501         if (ret < 0)
 502                 dev_warn(&pdev->dev, "unable to disable interrupt\n");
 503
 504         /* init cached IRQ enable bits */
 505         ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
 506         if (ret < 0)
 507                 goto out1;
 508
 509         rtc = rtc_device_register(pdev->name,
 510                                   &pdev->dev, &twl_rtc_ops, THIS_MODULE);
 511         if (IS_ERR(rtc)) {
 512                 ret = PTR_ERR(rtc);
 513                 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
 514                         PTR_ERR(rtc));
 515                 goto out1;
 516         }
 517
 518         ret = request_threaded_irq(irq, NULL, twl_rtc_interrupt,
 519                                    IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 520                                    dev_name(&rtc->dev), rtc);
 521         if (ret < 0) {
 522                 dev_err(&pdev->dev, "IRQ is not free.\n");
 523                 goto out2;
 524         }
 525
 526         platform_set_drvdata(pdev, rtc);
 527         return 0;
 528
 529 out2:
 530         rtc_device_unregister(rtc);
 531 out1:
 532         return ret;
 533 }
 534
 535 /*
 536  * Disable all TWL RTC module interrupts.
 537  * Sets status flag to free.
 538  */
 539 static int twl_rtc_remove(struct platform_device *pdev)
 540 {
 541         /* leave rtc running, but disable irqs */
 542         struct rtc_device *rtc = platform_get_drvdata(pdev);
 543         int irq = platform_get_irq(pdev, 0);
 544
 545         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 546         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 547         if (twl_class_is_6030()) {
 548                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
 549                         REG_INT_MSK_LINE_A);
 550                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
 551                         REG_INT_MSK_STS_A);
 552         }
 553
 554
 555         free_irq(irq, rtc);
 556
 557         rtc_device_unregister(rtc);
 558         platform_set_drvdata(pdev, NULL);
 559         return 0;
 560 }
 561
 562 static void twl_rtc_shutdown(struct platform_device *pdev)
 563 {
 564         /* mask timer interrupts, but leave alarm interrupts on to enable
 565            power-on when alarm is triggered */
 566         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 567 }
 568
 569 #ifdef CONFIG_PM
 570
 571 static unsigned char irqstat;
 572
 573 static int twl_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 574 {
 575         irqstat = rtc_irq_bits;
 576
 577         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 578         return 0;
 579 }
 580
 581 static int twl_rtc_resume(struct platform_device *pdev)
 582 {
 583         set_rtc_irq_bit(irqstat);
 584         return 0;
 585 }
 586
 587 #else
 588 #define twl_rtc_suspend NULL
 589 #define twl_rtc_resume  NULL
 590 #endif
 591
 592 #ifdef CONFIG_OF
 593 static const struct of_device_id twl_rtc_of_match[] = {
 594         {.compatible = "ti,twl4030-rtc", },
 595         { },
 596 };
 597 MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
 598 #endif
 599
 600 MODULE_ALIAS("platform:twl_rtc");
 601
 602 static struct platform_driver twl4030rtc_driver = {
 603         .probe          = twl_rtc_probe,
 604         .remove         = twl_rtc_remove,
 605         .shutdown       = twl_rtc_shutdown,
 606         .suspend        = twl_rtc_suspend,
 607         .resume         = twl_rtc_resume,
 608         .driver         = {
 609                 .owner          = THIS_MODULE,
 610                 .name           = "twl_rtc",
 611                 .of_match_table = of_match_ptr(twl_rtc_of_match),
 612         },
 613 };
 614
 615 static int __init twl_rtc_init(void)
 616 {
 617         if (twl_class_is_4030())
 618                 rtc_reg_map = (u8 *) twl4030_rtc_reg_map;
 619         else
 620                 rtc_reg_map = (u8 *) twl6030_rtc_reg_map;
 621
 622         return platform_driver_register(&twl4030rtc_driver);
 623 }
 624 module_init(twl_rtc_init);
 625
 626 static void __exit twl_rtc_exit(void)
 627 {
 628         platform_driver_unregister(&twl4030rtc_driver);
 629 }
 630 module_exit(twl_rtc_exit);
 631
 632 MODULE_AUTHOR("Texas Instruments, MontaVista Software");
 633 MODULE_LICENSE("GPL");