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1// SPDX-License-Identifier: GPL-2.02/*3 * SuperH On-Chip RTC Support4 *5 * Copyright (C) 2006 - 2009 Paul Mundt6 * Copyright (C) 2006 Jamie Lenehan7 * Copyright (C) 2008 Angelo Castello8 *9 * Based on the old arch/sh/kernel/cpu/rtc.c by:10 *11 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>12 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka13 */14#include <linux/module.h>15#include <linux/mod_devicetable.h>16#include <linux/kernel.h>17#include <linux/bcd.h>18#include <linux/rtc.h>19#include <linux/init.h>20#include <linux/platform_device.h>21#include <linux/seq_file.h>22#include <linux/interrupt.h>23#include <linux/spinlock.h>24#include <linux/io.h>25#include <linux/log2.h>26#include <linux/clk.h>27#include <linux/slab.h>28#ifdef CONFIG_SUPERH29#include <asm/rtc.h>30#else31/* Default values for RZ/A RTC */32#define rtc_reg_size sizeof(u16)33#define RTC_BIT_INVERTED 0 /* no chip bugs */34#define RTC_CAP_4_DIGIT_YEAR (1 << 0)35#define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR36#endif37 38#define DRV_NAME "sh-rtc"39 40#define RTC_REG(r) ((r) * rtc_reg_size)41 42#define R64CNT RTC_REG(0)43 44#define RSECCNT RTC_REG(1) /* RTC sec */45#define RMINCNT RTC_REG(2) /* RTC min */46#define RHRCNT RTC_REG(3) /* RTC hour */47#define RWKCNT RTC_REG(4) /* RTC week */48#define RDAYCNT RTC_REG(5) /* RTC day */49#define RMONCNT RTC_REG(6) /* RTC month */50#define RYRCNT RTC_REG(7) /* RTC year */51#define RSECAR RTC_REG(8) /* ALARM sec */52#define RMINAR RTC_REG(9) /* ALARM min */53#define RHRAR RTC_REG(10) /* ALARM hour */54#define RWKAR RTC_REG(11) /* ALARM week */55#define RDAYAR RTC_REG(12) /* ALARM day */56#define RMONAR RTC_REG(13) /* ALARM month */57#define RCR1 RTC_REG(14) /* Control */58#define RCR2 RTC_REG(15) /* Control */59 60/*61 * Note on RYRAR and RCR3: Up until this point most of the register62 * definitions are consistent across all of the available parts. However,63 * the placement of the optional RYRAR and RCR3 (the RYRAR control64 * register used to control RYRCNT/RYRAR compare) varies considerably65 * across various parts, occasionally being mapped in to a completely66 * unrelated address space. For proper RYRAR support a separate resource67 * would have to be handed off, but as this is purely optional in68 * practice, we simply opt not to support it, thereby keeping the code69 * quite a bit more simplified.70 */71 72/* ALARM Bits - or with BCD encoded value */73#define AR_ENB 0x80 /* Enable for alarm cmp */74 75/* Period Bits */76#define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */77#define PF_COUNT 0x200 /* Half periodic counter */78#define PF_OXS 0x400 /* Periodic One x Second */79#define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */80#define PF_MASK 0xf0081 82/* RCR1 Bits */83#define RCR1_CF 0x80 /* Carry Flag */84#define RCR1_CIE 0x10 /* Carry Interrupt Enable */85#define RCR1_AIE 0x08 /* Alarm Interrupt Enable */86#define RCR1_AF 0x01 /* Alarm Flag */87 88/* RCR2 Bits */89#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */90#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */91#define RCR2_RTCEN 0x08 /* ENable RTC */92#define RCR2_ADJ 0x04 /* ADJustment (30-second) */93#define RCR2_RESET 0x02 /* Reset bit */94#define RCR2_START 0x01 /* Start bit */95 96struct sh_rtc {97 void __iomem *regbase;98 unsigned long regsize;99 struct resource *res;100 int alarm_irq;101 int periodic_irq;102 int carry_irq;103 struct clk *clk;104 struct rtc_device *rtc_dev;105 spinlock_t lock;106 unsigned long capabilities; /* See asm/rtc.h for cap bits */107 unsigned short periodic_freq;108};109 110static int __sh_rtc_interrupt(struct sh_rtc *rtc)111{112 unsigned int tmp, pending;113 114 tmp = readb(rtc->regbase + RCR1);115 pending = tmp & RCR1_CF;116 tmp &= ~RCR1_CF;117 writeb(tmp, rtc->regbase + RCR1);118 119 /* Users have requested One x Second IRQ */120 if (pending && rtc->periodic_freq & PF_OXS)121 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);122 123 return pending;124}125 126static int __sh_rtc_alarm(struct sh_rtc *rtc)127{128 unsigned int tmp, pending;129 130 tmp = readb(rtc->regbase + RCR1);131 pending = tmp & RCR1_AF;132 tmp &= ~(RCR1_AF | RCR1_AIE);133 writeb(tmp, rtc->regbase + RCR1);134 135 if (pending)136 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);137 138 return pending;139}140 141static int __sh_rtc_periodic(struct sh_rtc *rtc)142{143 unsigned int tmp, pending;144 145 tmp = readb(rtc->regbase + RCR2);146 pending = tmp & RCR2_PEF;147 tmp &= ~RCR2_PEF;148 writeb(tmp, rtc->regbase + RCR2);149 150 if (!pending)151 return 0;152 153 /* Half period enabled than one skipped and the next notified */154 if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))155 rtc->periodic_freq &= ~PF_COUNT;156 else {157 if (rtc->periodic_freq & PF_HP)158 rtc->periodic_freq |= PF_COUNT;159 rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);160 }161 162 return pending;163}164 165static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)166{167 struct sh_rtc *rtc = dev_id;168 int ret;169 170 spin_lock(&rtc->lock);171 ret = __sh_rtc_interrupt(rtc);172 spin_unlock(&rtc->lock);173 174 return IRQ_RETVAL(ret);175}176 177static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)178{179 struct sh_rtc *rtc = dev_id;180 int ret;181 182 spin_lock(&rtc->lock);183 ret = __sh_rtc_alarm(rtc);184 spin_unlock(&rtc->lock);185 186 return IRQ_RETVAL(ret);187}188 189static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)190{191 struct sh_rtc *rtc = dev_id;192 int ret;193 194 spin_lock(&rtc->lock);195 ret = __sh_rtc_periodic(rtc);196 spin_unlock(&rtc->lock);197 198 return IRQ_RETVAL(ret);199}200 201static irqreturn_t sh_rtc_shared(int irq, void *dev_id)202{203 struct sh_rtc *rtc = dev_id;204 int ret;205 206 spin_lock(&rtc->lock);207 ret = __sh_rtc_interrupt(rtc);208 ret |= __sh_rtc_alarm(rtc);209 ret |= __sh_rtc_periodic(rtc);210 spin_unlock(&rtc->lock);211 212 return IRQ_RETVAL(ret);213}214 215static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)216{217 struct sh_rtc *rtc = dev_get_drvdata(dev);218 unsigned int tmp;219 220 spin_lock_irq(&rtc->lock);221 222 tmp = readb(rtc->regbase + RCR1);223 224 if (enable)225 tmp |= RCR1_AIE;226 else227 tmp &= ~RCR1_AIE;228 229 writeb(tmp, rtc->regbase + RCR1);230 231 spin_unlock_irq(&rtc->lock);232}233 234static int sh_rtc_proc(struct device *dev, struct seq_file *seq)235{236 struct sh_rtc *rtc = dev_get_drvdata(dev);237 unsigned int tmp;238 239 tmp = readb(rtc->regbase + RCR1);240 seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");241 242 tmp = readb(rtc->regbase + RCR2);243 seq_printf(seq, "periodic_IRQ\t: %s\n",244 (tmp & RCR2_PESMASK) ? "yes" : "no");245 246 return 0;247}248 249static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)250{251 struct sh_rtc *rtc = dev_get_drvdata(dev);252 unsigned int tmp;253 254 spin_lock_irq(&rtc->lock);255 256 tmp = readb(rtc->regbase + RCR1);257 258 if (!enable)259 tmp &= ~RCR1_CIE;260 else261 tmp |= RCR1_CIE;262 263 writeb(tmp, rtc->regbase + RCR1);264 265 spin_unlock_irq(&rtc->lock);266}267 268static int sh_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)269{270 sh_rtc_setaie(dev, enabled);271 return 0;272}273 274static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)275{276 struct sh_rtc *rtc = dev_get_drvdata(dev);277 unsigned int sec128, sec2, yr, yr100, cf_bit;278 279 if (!(readb(rtc->regbase + RCR2) & RCR2_RTCEN))280 return -EINVAL;281 282 do {283 unsigned int tmp;284 285 spin_lock_irq(&rtc->lock);286 287 tmp = readb(rtc->regbase + RCR1);288 tmp &= ~RCR1_CF; /* Clear CF-bit */289 tmp |= RCR1_CIE;290 writeb(tmp, rtc->regbase + RCR1);291 292 sec128 = readb(rtc->regbase + R64CNT);293 294 tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT));295 tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT));296 tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT));297 tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT));298 tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT));299 tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;300 301 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {302 yr = readw(rtc->regbase + RYRCNT);303 yr100 = bcd2bin(yr >> 8);304 yr &= 0xff;305 } else {306 yr = readb(rtc->regbase + RYRCNT);307 yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);308 }309 310 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;311 312 sec2 = readb(rtc->regbase + R64CNT);313 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;314 315 spin_unlock_irq(&rtc->lock);316 } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);317 318#if RTC_BIT_INVERTED != 0319 if ((sec128 & RTC_BIT_INVERTED))320 tm->tm_sec--;321#endif322 323 /* only keep the carry interrupt enabled if UIE is on */324 if (!(rtc->periodic_freq & PF_OXS))325 sh_rtc_setcie(dev, 0);326 327 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "328 "mday=%d, mon=%d, year=%d, wday=%d\n",329 __func__,330 tm->tm_sec, tm->tm_min, tm->tm_hour,331 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);332 333 return 0;334}335 336static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)337{338 struct sh_rtc *rtc = dev_get_drvdata(dev);339 unsigned int tmp;340 int year;341 342 spin_lock_irq(&rtc->lock);343 344 /* Reset pre-scaler & stop RTC */345 tmp = readb(rtc->regbase + RCR2);346 tmp |= RCR2_RESET;347 tmp &= ~RCR2_START;348 writeb(tmp, rtc->regbase + RCR2);349 350 writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT);351 writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT);352 writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);353 writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);354 writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);355 writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);356 357 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {358 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |359 bin2bcd(tm->tm_year % 100);360 writew(year, rtc->regbase + RYRCNT);361 } else {362 year = tm->tm_year % 100;363 writeb(bin2bcd(year), rtc->regbase + RYRCNT);364 }365 366 /* Start RTC */367 tmp = readb(rtc->regbase + RCR2);368 tmp &= ~RCR2_RESET;369 tmp |= RCR2_RTCEN | RCR2_START;370 writeb(tmp, rtc->regbase + RCR2);371 372 spin_unlock_irq(&rtc->lock);373 374 return 0;375}376 377static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)378{379 unsigned int byte;380 int value = -1; /* return -1 for ignored values */381 382 byte = readb(rtc->regbase + reg_off);383 if (byte & AR_ENB) {384 byte &= ~AR_ENB; /* strip the enable bit */385 value = bcd2bin(byte);386 }387 388 return value;389}390 391static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)392{393 struct sh_rtc *rtc = dev_get_drvdata(dev);394 struct rtc_time *tm = &wkalrm->time;395 396 spin_lock_irq(&rtc->lock);397 398 tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR);399 tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR);400 tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR);401 tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR);402 tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR);403 tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR);404 if (tm->tm_mon > 0)405 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */406 407 wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;408 409 spin_unlock_irq(&rtc->lock);410 411 return 0;412}413 414static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,415 int value, int reg_off)416{417 /* < 0 for a value that is ignored */418 if (value < 0)419 writeb(0, rtc->regbase + reg_off);420 else421 writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off);422}423 424static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)425{426 struct sh_rtc *rtc = dev_get_drvdata(dev);427 unsigned int rcr1;428 struct rtc_time *tm = &wkalrm->time;429 int mon;430 431 spin_lock_irq(&rtc->lock);432 433 /* disable alarm interrupt and clear the alarm flag */434 rcr1 = readb(rtc->regbase + RCR1);435 rcr1 &= ~(RCR1_AF | RCR1_AIE);436 writeb(rcr1, rtc->regbase + RCR1);437 438 /* set alarm time */439 sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR);440 sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR);441 sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);442 sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);443 sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);444 mon = tm->tm_mon;445 if (mon >= 0)446 mon += 1;447 sh_rtc_write_alarm_value(rtc, mon, RMONAR);448 449 if (wkalrm->enabled) {450 rcr1 |= RCR1_AIE;451 writeb(rcr1, rtc->regbase + RCR1);452 }453 454 spin_unlock_irq(&rtc->lock);455 456 return 0;457}458 459static const struct rtc_class_ops sh_rtc_ops = {460 .read_time = sh_rtc_read_time,461 .set_time = sh_rtc_set_time,462 .read_alarm = sh_rtc_read_alarm,463 .set_alarm = sh_rtc_set_alarm,464 .proc = sh_rtc_proc,465 .alarm_irq_enable = sh_rtc_alarm_irq_enable,466};467 468static int __init sh_rtc_probe(struct platform_device *pdev)469{470 struct sh_rtc *rtc;471 struct resource *res;472 char clk_name[14];473 int clk_id, ret;474 475 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);476 if (unlikely(!rtc))477 return -ENOMEM;478 479 spin_lock_init(&rtc->lock);480 481 /* get periodic/carry/alarm irqs */482 ret = platform_get_irq(pdev, 0);483 if (unlikely(ret <= 0)) {484 dev_err(&pdev->dev, "No IRQ resource\n");485 return -ENOENT;486 }487 488 rtc->periodic_irq = ret;489 rtc->carry_irq = platform_get_irq(pdev, 1);490 rtc->alarm_irq = platform_get_irq(pdev, 2);491 492 res = platform_get_resource(pdev, IORESOURCE_IO, 0);493 if (!res)494 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);495 if (unlikely(res == NULL)) {496 dev_err(&pdev->dev, "No IO resource\n");497 return -ENOENT;498 }499 500 rtc->regsize = resource_size(res);501 502 rtc->res = devm_request_mem_region(&pdev->dev, res->start,503 rtc->regsize, pdev->name);504 if (unlikely(!rtc->res))505 return -EBUSY;506 507 rtc->regbase = devm_ioremap(&pdev->dev, rtc->res->start, rtc->regsize);508 if (unlikely(!rtc->regbase))509 return -EINVAL;510 511 if (!pdev->dev.of_node) {512 clk_id = pdev->id;513 /* With a single device, the clock id is still "rtc0" */514 if (clk_id < 0)515 clk_id = 0;516 517 snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);518 } else519 snprintf(clk_name, sizeof(clk_name), "fck");520 521 rtc->clk = devm_clk_get(&pdev->dev, clk_name);522 if (IS_ERR(rtc->clk)) {523 /*524 * No error handling for rtc->clk intentionally, not all525 * platforms will have a unique clock for the RTC, and526 * the clk API can handle the struct clk pointer being527 * NULL.528 */529 rtc->clk = NULL;530 }531 532 rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);533 if (IS_ERR(rtc->rtc_dev))534 return PTR_ERR(rtc->rtc_dev);535 536 clk_enable(rtc->clk);537 538 rtc->capabilities = RTC_DEF_CAPABILITIES;539 540#ifdef CONFIG_SUPERH541 if (dev_get_platdata(&pdev->dev)) {542 struct sh_rtc_platform_info *pinfo =543 dev_get_platdata(&pdev->dev);544 545 /*546 * Some CPUs have special capabilities in addition to the547 * default set. Add those in here.548 */549 rtc->capabilities |= pinfo->capabilities;550 }551#endif552 553 if (rtc->carry_irq <= 0) {554 /* register shared periodic/carry/alarm irq */555 ret = devm_request_irq(&pdev->dev, rtc->periodic_irq,556 sh_rtc_shared, 0, "sh-rtc", rtc);557 if (unlikely(ret)) {558 dev_err(&pdev->dev,559 "request IRQ failed with %d, IRQ %d\n", ret,560 rtc->periodic_irq);561 goto err_unmap;562 }563 } else {564 /* register periodic/carry/alarm irqs */565 ret = devm_request_irq(&pdev->dev, rtc->periodic_irq,566 sh_rtc_periodic, 0, "sh-rtc period", rtc);567 if (unlikely(ret)) {568 dev_err(&pdev->dev,569 "request period IRQ failed with %d, IRQ %d\n",570 ret, rtc->periodic_irq);571 goto err_unmap;572 }573 574 ret = devm_request_irq(&pdev->dev, rtc->carry_irq,575 sh_rtc_interrupt, 0, "sh-rtc carry", rtc);576 if (unlikely(ret)) {577 dev_err(&pdev->dev,578 "request carry IRQ failed with %d, IRQ %d\n",579 ret, rtc->carry_irq);580 goto err_unmap;581 }582 583 ret = devm_request_irq(&pdev->dev, rtc->alarm_irq,584 sh_rtc_alarm, 0, "sh-rtc alarm", rtc);585 if (unlikely(ret)) {586 dev_err(&pdev->dev,587 "request alarm IRQ failed with %d, IRQ %d\n",588 ret, rtc->alarm_irq);589 goto err_unmap;590 }591 }592 593 platform_set_drvdata(pdev, rtc);594 595 /* everything disabled by default */596 sh_rtc_setaie(&pdev->dev, 0);597 sh_rtc_setcie(&pdev->dev, 0);598 599 rtc->rtc_dev->ops = &sh_rtc_ops;600 rtc->rtc_dev->max_user_freq = 256;601 602 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {603 rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900;604 rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_9999;605 } else {606 rtc->rtc_dev->range_min = mktime64(1999, 1, 1, 0, 0, 0);607 rtc->rtc_dev->range_max = mktime64(2098, 12, 31, 23, 59, 59);608 }609 610 ret = devm_rtc_register_device(rtc->rtc_dev);611 if (ret)612 goto err_unmap;613 614 device_init_wakeup(&pdev->dev, 1);615 return 0;616 617err_unmap:618 clk_disable(rtc->clk);619 620 return ret;621}622 623static void __exit sh_rtc_remove(struct platform_device *pdev)624{625 struct sh_rtc *rtc = platform_get_drvdata(pdev);626 627 sh_rtc_setaie(&pdev->dev, 0);628 sh_rtc_setcie(&pdev->dev, 0);629 630 clk_disable(rtc->clk);631}632 633static void sh_rtc_set_irq_wake(struct device *dev, int enabled)634{635 struct sh_rtc *rtc = dev_get_drvdata(dev);636 637 irq_set_irq_wake(rtc->periodic_irq, enabled);638 639 if (rtc->carry_irq > 0) {640 irq_set_irq_wake(rtc->carry_irq, enabled);641 irq_set_irq_wake(rtc->alarm_irq, enabled);642 }643}644 645static int __maybe_unused sh_rtc_suspend(struct device *dev)646{647 if (device_may_wakeup(dev))648 sh_rtc_set_irq_wake(dev, 1);649 650 return 0;651}652 653static int __maybe_unused sh_rtc_resume(struct device *dev)654{655 if (device_may_wakeup(dev))656 sh_rtc_set_irq_wake(dev, 0);657 658 return 0;659}660 661static SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume);662 663static const struct of_device_id sh_rtc_of_match[] = {664 { .compatible = "renesas,sh-rtc", },665 { /* sentinel */ }666};667MODULE_DEVICE_TABLE(of, sh_rtc_of_match);668 669/*670 * sh_rtc_remove() lives in .exit.text. For drivers registered via671 * module_platform_driver_probe() this is ok because they cannot get unbound at672 * runtime. So mark the driver struct with __refdata to prevent modpost673 * triggering a section mismatch warning.674 */675static struct platform_driver sh_rtc_platform_driver __refdata = {676 .driver = {677 .name = DRV_NAME,678 .pm = &sh_rtc_pm_ops,679 .of_match_table = sh_rtc_of_match,680 },681 .remove_new = __exit_p(sh_rtc_remove),682};683 684module_platform_driver_probe(sh_rtc_platform_driver, sh_rtc_probe);685 686MODULE_DESCRIPTION("SuperH on-chip RTC driver");687MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "688 "Jamie Lenehan <lenehan@twibble.org>, "689 "Angelo Castello <angelo.castello@st.com>");690MODULE_LICENSE("GPL v2");691MODULE_ALIAS("platform:" DRV_NAME);692