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         struct platform_device *pdev = to_platform_device(dev);
 217         int irq = platform_get_irq(pdev, 0);
 218         static bool twl_rtc_wake_enabled;
 219         int ret;
 220
 221         if (enabled) {
 222                 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 223                 if (device_can_wakeup(dev) && !twl_rtc_wake_enabled) {
 224                         enable_irq_wake(irq);
 225                         twl_rtc_wake_enabled = true;
 226                 }
 227         } else {
 228                 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 229                 if (twl_rtc_wake_enabled) {
 230                         disable_irq_wake(irq);
 231                         twl_rtc_wake_enabled = false;
 232                 }
 233         }
 234
 235         return ret;
 236 }
 237
 238 /*
 239  * Gets current TWL RTC time and date parameters.
 240  *
 241  * The RTC's time/alarm representation is not what gmtime(3) requires
 242  * Linux to use:
 243  *
 244  *  - Months are 1..12 vs Linux 0-11
 245  *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
 246  */
 247 static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
 248 {
 249         unsigned char rtc_data[ALL_TIME_REGS];
 250         int ret;
 251         u8 save_control;
 252         u8 rtc_control;
 253
 254         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
 255         if (ret < 0) {
 256                 dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
 257                 return ret;
 258         }
 259         /* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
 260         if (twl_class_is_6030()) {
 261                 if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
 262                         save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
 263                         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 264                         if (ret < 0) {
 265                                 dev_err(dev, "%s clr GET_TIME, error %d\n",
 266                                         __func__, ret);
 267                                 return ret;
 268                         }
 269                 }
 270         }
 271
 272         /* Copy RTC counting registers to static registers or latches */
 273         rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
 274
 275         /* for twl6030/32 enable read access to static shadowed registers */
 276         if (twl_class_is_6030())
 277                 rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
 278
 279         ret = twl_rtc_write_u8(rtc_control, REG_RTC_CTRL_REG);
 280         if (ret < 0) {
 281                 dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
 282                 return ret;
 283         }
 284
 285         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
 286                         (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 287
 288         if (ret < 0) {
 289                 dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
 290                 return ret;
 291         }
 292
 293         /* for twl6030 restore original state of rtc control register */
 294         if (twl_class_is_6030()) {
 295                 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 296                 if (ret < 0) {
 297                         dev_err(dev, "%s: restore CTRL_REG, error %d\n",
 298                                 __func__, ret);
 299                         return ret;
 300                 }
 301         }
 302
 303         tm->tm_sec = bcd2bin(rtc_data[0]);
 304         tm->tm_min = bcd2bin(rtc_data[1]);
 305         tm->tm_hour = bcd2bin(rtc_data[2]);
 306         tm->tm_mday = bcd2bin(rtc_data[3]);
 307         tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
 308         tm->tm_year = bcd2bin(rtc_data[5]) + 100;
 309
 310         return ret;
 311 }
 312
 313 static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
 314 {
 315         unsigned char save_control;
 316         unsigned char rtc_data[ALL_TIME_REGS];
 317         int ret;
 318
 319         rtc_data[0] = bin2bcd(tm->tm_sec);
 320         rtc_data[1] = bin2bcd(tm->tm_min);
 321         rtc_data[2] = bin2bcd(tm->tm_hour);
 322         rtc_data[3] = bin2bcd(tm->tm_mday);
 323         rtc_data[4] = bin2bcd(tm->tm_mon + 1);
 324         rtc_data[5] = bin2bcd(tm->tm_year - 100);
 325
 326         /* Stop RTC while updating the TC registers */
 327         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
 328         if (ret < 0)
 329                 goto out;
 330
 331         save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
 332         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 333         if (ret < 0)
 334                 goto out;
 335
 336         /* update all the time registers in one shot */
 337         ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
 338                 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 339         if (ret < 0) {
 340                 dev_err(dev, "rtc_set_time error %d\n", ret);
 341                 goto out;
 342         }
 343
 344         /* Start back RTC */
 345         save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
 346         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 347
 348 out:
 349         return ret;
 350 }
 351
 352 /*
 353  * Gets current TWL RTC alarm time.
 354  */
 355 static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 356 {
 357         unsigned char rtc_data[ALL_TIME_REGS];
 358         int ret;
 359
 360         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
 361                         (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
 362         if (ret < 0) {
 363                 dev_err(dev, "rtc_read_alarm error %d\n", ret);
 364                 return ret;
 365         }
 366
 367         /* some of these fields may be wildcard/"match all" */
 368         alm->time.tm_sec = bcd2bin(rtc_data[0]);
 369         alm->time.tm_min = bcd2bin(rtc_data[1]);
 370         alm->time.tm_hour = bcd2bin(rtc_data[2]);
 371         alm->time.tm_mday = bcd2bin(rtc_data[3]);
 372         alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
 373         alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
 374
 375         /* report cached alarm enable state */
 376         if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
 377                 alm->enabled = 1;
 378
 379         return ret;
 380 }
 381
 382 static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 383 {
 384         unsigned char alarm_data[ALL_TIME_REGS];
 385         int ret;
 386
 387         ret = twl_rtc_alarm_irq_enable(dev, 0);
 388         if (ret)
 389                 goto out;
 390
 391         alarm_data[0] = bin2bcd(alm->time.tm_sec);
 392         alarm_data[1] = bin2bcd(alm->time.tm_min);
 393         alarm_data[2] = bin2bcd(alm->time.tm_hour);
 394         alarm_data[3] = bin2bcd(alm->time.tm_mday);
 395         alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
 396         alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
 397
 398         /* update all the alarm registers in one shot */
 399         ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
 400                 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
 401         if (ret) {
 402                 dev_err(dev, "rtc_set_alarm error %d\n", ret);
 403                 goto out;
 404         }
 405
 406         if (alm->enabled)
 407                 ret = twl_rtc_alarm_irq_enable(dev, 1);
 408 out:
 409         return ret;
 410 }
 411
 412 static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
 413 {
 414         unsigned long events;
 415         int ret = IRQ_NONE;
 416         int res;
 417         u8 rd_reg;
 418
 419         res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 420         if (res)
 421                 goto out;
 422         /*
 423          * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
 424          * only one (ALARM or RTC) interrupt source may be enabled
 425          * at time, we also could check our results
 426          * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
 427          */
 428         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
 429                 events = RTC_IRQF | RTC_AF;
 430         else
 431                 events = RTC_IRQF | RTC_PF;
 432
 433         res = twl_rtc_write_u8(BIT_RTC_STATUS_REG_ALARM_M,
 434                                    REG_RTC_STATUS_REG);
 435         if (res)
 436                 goto out;
 437
 438         if (twl_class_is_4030()) {
 439                 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
 440                  * needs 2 reads to clear the interrupt. One read is done in
 441                  * do_twl_pwrirq(). Doing the second read, to clear
 442                  * the bit.
 443                  *
 444                  * FIXME the reason PWR_ISR1 needs an extra read is that
 445                  * RTC_IF retriggered until we cleared REG_ALARM_M above.
 446                  * But re-reading like this is a bad hack; by doing so we
 447                  * risk wrongly clearing status for some other IRQ (losing
 448                  * the interrupt).  Be smarter about handling RTC_UF ...
 449                  */
 450                 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
 451                         &rd_reg, TWL4030_INT_PWR_ISR1);
 452                 if (res)
 453                         goto out;
 454         }
 455
 456         /* Notify RTC core on event */
 457         rtc_update_irq(rtc, 1, events);
 458
 459         ret = IRQ_HANDLED;
 460 out:
 461         return ret;
 462 }
 463
 464 static struct rtc_class_ops twl_rtc_ops = {
 465         .read_time      = twl_rtc_read_time,
 466         .set_time       = twl_rtc_set_time,
 467         .read_alarm     = twl_rtc_read_alarm,
 468         .set_alarm      = twl_rtc_set_alarm,
 469         .alarm_irq_enable = twl_rtc_alarm_irq_enable,
 470 };
 471
 472 /*----------------------------------------------------------------------*/
 473
 474 static int twl_rtc_probe(struct platform_device *pdev)
 475 {
 476         struct rtc_device *rtc;
 477         int ret = -EINVAL;
 478         int irq = platform_get_irq(pdev, 0);
 479         u8 rd_reg;
 480
 481         if (irq <= 0)
 482                 return ret;
 483
 484         /* Initialize the register map */
 485         if (twl_class_is_4030())
 486                 rtc_reg_map = (u8 *)twl4030_rtc_reg_map;
 487         else
 488                 rtc_reg_map = (u8 *)twl6030_rtc_reg_map;
 489
 490         ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 491         if (ret < 0)
 492                 return ret;
 493
 494         if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
 495                 dev_warn(&pdev->dev, "Power up reset detected.\n");
 496
 497         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
 498                 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
 499
 500         /* Clear RTC Power up reset and pending alarm interrupts */
 501         ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
 502         if (ret < 0)
 503                 return ret;
 504
 505         if (twl_class_is_6030()) {
 506                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
 507                         REG_INT_MSK_LINE_A);
 508                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
 509                         REG_INT_MSK_STS_A);
 510         }
 511
 512         dev_info(&pdev->dev, "Enabling TWL-RTC\n");
 513         ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
 514         if (ret < 0)
 515                 return ret;
 516
 517         /* ensure interrupts are disabled, bootloaders can be strange */
 518         ret = twl_rtc_write_u8(0, REG_RTC_INTERRUPTS_REG);
 519         if (ret < 0)
 520                 dev_warn(&pdev->dev, "unable to disable interrupt\n");
 521
 522         /* init cached IRQ enable bits */
 523         ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
 524         if (ret < 0)
 525                 return ret;
 526
 527         device_init_wakeup(&pdev->dev, 1);
 528
 529         rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
 530                                         &twl_rtc_ops, THIS_MODULE);
 531         if (IS_ERR(rtc)) {
 532                 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
 533                         PTR_ERR(rtc));
 534                 return PTR_ERR(rtc);
 535         }
 536
 537         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 538                                         twl_rtc_interrupt,
 539                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 540                                         dev_name(&rtc->dev), rtc);
 541         if (ret < 0) {
 542                 dev_err(&pdev->dev, "IRQ is not free.\n");
 543                 return ret;
 544         }
 545
 546         platform_set_drvdata(pdev, rtc);
 547         return 0;
 548 }
 549
 550 /*
 551  * Disable all TWL RTC module interrupts.
 552  * Sets status flag to free.
 553  */
 554 static int twl_rtc_remove(struct platform_device *pdev)
 555 {
 556         /* leave rtc running, but disable irqs */
 557         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 558         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 559         if (twl_class_is_6030()) {
 560                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
 561                         REG_INT_MSK_LINE_A);
 562                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
 563                         REG_INT_MSK_STS_A);
 564         }
 565
 566         return 0;
 567 }
 568
 569 static void twl_rtc_shutdown(struct platform_device *pdev)
 570 {
 571         /* mask timer interrupts, but leave alarm interrupts on to enable
 572            power-on when alarm is triggered */
 573         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 574 }
 575
 576 #ifdef CONFIG_PM_SLEEP
 577 static unsigned char irqstat;
 578
 579 static int twl_rtc_suspend(struct device *dev)
 580 {
 581         irqstat = rtc_irq_bits;
 582
 583         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 584         return 0;
 585 }
 586
 587 static int twl_rtc_resume(struct device *dev)
 588 {
 589         set_rtc_irq_bit(irqstat);
 590         return 0;
 591 }
 592 #endif
 593
 594 static SIMPLE_DEV_PM_OPS(twl_rtc_pm_ops, twl_rtc_suspend, twl_rtc_resume);
 595
 596 #ifdef CONFIG_OF
 597 static const struct of_device_id twl_rtc_of_match[] = {
 598         {.compatible = "ti,twl4030-rtc", },
 599         { },
 600 };
 601 MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
 602 #endif
 603
 604 MODULE_ALIAS("platform:twl_rtc");
 605
 606 static struct platform_driver twl4030rtc_driver = {
 607         .probe          = twl_rtc_probe,
 608         .remove         = twl_rtc_remove,
 609         .shutdown       = twl_rtc_shutdown,
 610         .driver         = {
 611                 .owner          = THIS_MODULE,
 612                 .name           = "twl_rtc",
 613                 .pm             = &twl_rtc_pm_ops,
 614                 .of_match_table = of_match_ptr(twl_rtc_of_match),
 615         },
 616 };
 617
 618 module_platform_driver(twl4030rtc_driver);
 619
 620 MODULE_AUTHOR("Texas Instruments, MontaVista Software");
 621 MODULE_LICENSE("GPL");