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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/rtc/rtc-davinci.c
....@@ -1,23 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * DaVinci Power Management and Real Time Clock Driver for TI platforms
34  *
45  * Copyright (C) 2009 Texas Instruments, Inc
56  *
67  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; either version 2 of the License, or
11
- * (at your option) any later version.
12
- *
13
- * This program is distributed in the hope that it will be useful,
14
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16
- * GNU General Public License for more details.
17
- *
18
- * You should have received a copy of the GNU General Public License
19
- * along with this program; if not, write to the Free Software
20
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
218  */
229 #include <linux/kernel.h>
2310 #include <linux/init.h>
....@@ -240,7 +227,7 @@
240227 	return ret;
241228 }
242229 
243
-static int convertfromdays(u16 days, struct rtc_time *tm)
230
+static void convertfromdays(u16 days, struct rtc_time *tm)
244231 {
245232 	int tmp_days, year, mon;
246233 
....@@ -263,24 +250,17 @@
263250 			break;
264251 		}
265252 	}
266
-	return 0;
267253 }
268254 
269
-static int convert2days(u16 *days, struct rtc_time *tm)
255
+static void convert2days(u16 *days, struct rtc_time *tm)
270256 {
271257 	int i;
272258 	*days = 0;
273
-
274
-	/* epoch == 1900 */
275
-	if (tm->tm_year < 100 || tm->tm_year > 199)
276
-		return -EINVAL;
277259 
278260 	for (i = 2000; i < 1900 + tm->tm_year; i++)
279261 		*days += rtc_year_days(1, 12, i);
280262 
281263 	*days += rtc_year_days(tm->tm_mday, tm->tm_mon, 1900 + tm->tm_year);
282
-
283
-	return 0;
284264 }
285265 
286266 static int davinci_rtc_read_time(struct device *dev, struct rtc_time *tm)
....@@ -313,8 +293,7 @@
313293 	days <<= 8;
314294 	days |= day0;
315295 
316
-	if (convertfromdays(days, tm) < 0)
317
-		return -EINVAL;
296
+	convertfromdays(days, tm);
318297 
319298 	return 0;
320299 }
....@@ -326,8 +305,7 @@
326305 	u8 rtc_cctrl;
327306 	unsigned long flags;
328307 
329
-	if (convert2days(&days, tm) < 0)
330
-		return -EINVAL;
308
+	convert2days(&days, tm);
331309 
332310 	spin_lock_irqsave(&davinci_rtc_lock, flags);
333311 
....@@ -409,8 +387,7 @@
409387 	days <<= 8;
410388 	days |= day0;
411389 
412
-	if (convertfromdays(days, &alm->time) < 0)
413
-		return -EINVAL;
390
+	convertfromdays(days, &alm->time);
414391 
415392 	alm->pending = !!(rtcss_read(davinci_rtc,
416393 			  PRTCSS_RTC_CCTRL) &
....@@ -426,29 +403,7 @@
426403 	unsigned long flags;
427404 	u16 days;
428405 
429
-	if (alm->time.tm_mday <= 0 && alm->time.tm_mon < 0
430
-	    && alm->time.tm_year < 0) {
431
-		struct rtc_time tm;
432
-		unsigned long now, then;
433
-
434
-		davinci_rtc_read_time(dev, &tm);
435
-		rtc_tm_to_time(&tm, &now);
436
-
437
-		alm->time.tm_mday = tm.tm_mday;
438
-		alm->time.tm_mon = tm.tm_mon;
439
-		alm->time.tm_year = tm.tm_year;
440
-		rtc_tm_to_time(&alm->time, &then);
441
-
442
-		if (then < now) {
443
-			rtc_time_to_tm(now + 24 * 60 * 60, &tm);
444
-			alm->time.tm_mday = tm.tm_mday;
445
-			alm->time.tm_mon = tm.tm_mon;
446
-			alm->time.tm_year = tm.tm_year;
447
-		}
448
-	}
449
-
450
-	if (convert2days(&days, &alm->time) < 0)
451
-		return -EINVAL;
406
+	convert2days(&days, &alm->time);
452407 
453408 	spin_lock_irqsave(&davinci_rtc_lock, flags);
454409 
....@@ -482,7 +437,6 @@
482437 {
483438 	struct device *dev = &pdev->dev;
484439 	struct davinci_rtc *davinci_rtc;
485
-	struct resource *res;
486440 	int ret = 0;
487441 
488442 	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc), GFP_KERNEL);
....@@ -490,25 +444,22 @@
490444 		return -ENOMEM;
491445 
492446 	davinci_rtc->irq = platform_get_irq(pdev, 0);
493
-	if (davinci_rtc->irq < 0) {
494
-		dev_err(dev, "no RTC irq\n");
447
+	if (davinci_rtc->irq < 0)
495448 		return davinci_rtc->irq;
496
-	}
497449 
498
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
499
-	davinci_rtc->base = devm_ioremap_resource(dev, res);
450
+	davinci_rtc->base = devm_platform_ioremap_resource(pdev, 0);
500451 	if (IS_ERR(davinci_rtc->base))
501452 		return PTR_ERR(davinci_rtc->base);
502453 
503454 	platform_set_drvdata(pdev, davinci_rtc);
504455 
505
-	davinci_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
506
-				    &davinci_rtc_ops, THIS_MODULE);
507
-	if (IS_ERR(davinci_rtc->rtc)) {
508
-		dev_err(dev, "unable to register RTC device, err %d\n",
509
-				ret);
456
+	davinci_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
457
+	if (IS_ERR(davinci_rtc->rtc))
510458 		return PTR_ERR(davinci_rtc->rtc);
511
-	}
459
+
460
+	davinci_rtc->rtc->ops = &davinci_rtc_ops;
461
+	davinci_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
462
+	davinci_rtc->rtc->range_max = RTC_TIMESTAMP_BEGIN_2000 + (1 << 16) * 86400ULL - 1;
512463 
513464 	rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
514465 	rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
....@@ -533,7 +484,7 @@
533484 
534485 	device_init_wakeup(&pdev->dev, 0);
535486 
536
-	return 0;
487
+	return rtc_register_device(davinci_rtc->rtc);
537488 }
538489 
539490 static int __exit davinci_rtc_remove(struct platform_device *pdev)