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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/drivers/rtc/rtc-at91sam9.c
....@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0+
12 /*
23  * "RTT as Real Time Clock" driver for AT91SAM9 SoC family
34  *
45  * (C) 2007 Michel Benoit
56  *
67  * Based on rtc-at91rm9200.c by Rick Bronson
7
- *
8
- * This program is free software; you can redistribute it and/or
9
- * modify it under the terms of the GNU General Public License
10
- * as published by the Free Software Foundation; either version
11
- * 2 of the License, or (at your option) any later version.
128  */
139 
1410 #include <linux/clk.h>
....@@ -47,21 +43,21 @@
4743  * registers available, likewise usable for more than "RTC" support.
4844  */
4945 
50
-#define AT91_RTT_MR		0x00			/* Real-time Mode Register */
51
-#define AT91_RTT_RTPRES		(0xffff << 0)		/* Real-time Timer Prescaler Value */
52
-#define AT91_RTT_ALMIEN		(1 << 16)		/* Alarm Interrupt Enable */
53
-#define AT91_RTT_RTTINCIEN	(1 << 17)		/* Real Time Timer Increment Interrupt Enable */
54
-#define AT91_RTT_RTTRST		(1 << 18)		/* Real Time Timer Restart */
46
+#define AT91_RTT_MR		0x00		/* Real-time Mode Register */
47
+#define AT91_RTT_RTPRES		(0xffff << 0)	/* Timer Prescaler Value */
48
+#define AT91_RTT_ALMIEN		BIT(16)		/* Alarm Interrupt Enable */
49
+#define AT91_RTT_RTTINCIEN	BIT(17)		/* Increment Interrupt Enable */
50
+#define AT91_RTT_RTTRST		BIT(18)		/* Timer Restart */
5551 
56
-#define AT91_RTT_AR		0x04			/* Real-time Alarm Register */
57
-#define AT91_RTT_ALMV		(0xffffffff)		/* Alarm Value */
52
+#define AT91_RTT_AR		0x04		/* Real-time Alarm Register */
53
+#define AT91_RTT_ALMV		(0xffffffff)	/* Alarm Value */
5854 
59
-#define AT91_RTT_VR		0x08			/* Real-time Value Register */
60
-#define AT91_RTT_CRTV		(0xffffffff)		/* Current Real-time Value */
55
+#define AT91_RTT_VR		0x08		/* Real-time Value Register */
56
+#define AT91_RTT_CRTV		(0xffffffff)	/* Current Real-time Value */
6157 
62
-#define AT91_RTT_SR		0x0c			/* Real-time Status Register */
63
-#define AT91_RTT_ALMS		(1 << 0)		/* Real-time Alarm Status */
64
-#define AT91_RTT_RTTINC		(1 << 1)		/* Real-time Timer Increment */
58
+#define AT91_RTT_SR		0x0c		/* Real-time Status Register */
59
+#define AT91_RTT_ALMS		BIT(0)		/* Alarm Status */
60
+#define AT91_RTT_RTTINC		BIT(1)		/* Timer Increment */
6561 
6662 /*
6763  * We store ALARM_DISABLED in ALMV to record that no alarm is set.
....@@ -69,14 +65,13 @@
6965  */
7066 #define ALARM_DISABLED	((u32)~0)
7167 
72
-
7368 struct sam9_rtc {
7469 	void __iomem		*rtt;
7570 	struct rtc_device	*rtcdev;
7671 	u32			imr;
7772 	struct regmap		*gpbr;
7873 	unsigned int		gpbr_offset;
79
-	int 			irq;
74
+	int			irq;
8075 	struct clk		*sclk;
8176 	bool			suspended;
8277 	unsigned long		events;
....@@ -122,11 +117,9 @@
122117 	if (secs != secs2)
123118 		secs = rtt_readl(rtc, VR);
124119 
125
-	rtc_time_to_tm(offset + secs, tm);
120
+	rtc_time64_to_tm(offset + secs, tm);
126121 
127
-	dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readtime",
128
-		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
129
-		tm->tm_hour, tm->tm_min, tm->tm_sec);
122
+	dev_dbg(dev, "%s: %ptR\n", __func__, tm);
130123 
131124 	return 0;
132125 }
....@@ -137,17 +130,12 @@
137130 static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
138131 {
139132 	struct sam9_rtc *rtc = dev_get_drvdata(dev);
140
-	int err;
141133 	u32 offset, alarm, mr;
142134 	unsigned long secs;
143135 
144
-	dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "settime",
145
-		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
146
-		tm->tm_hour, tm->tm_min, tm->tm_sec);
136
+	dev_dbg(dev, "%s: %ptR\n", __func__, tm);
147137 
148
-	err = rtc_tm_to_time(tm, &secs);
149
-	if (err != 0)
150
-		return err;
138
+	secs = rtc_tm_to_time64(tm);
151139 
152140 	mr = rtt_readl(rtc, MR);
153141 
....@@ -197,11 +185,9 @@
197185 
198186 	memset(alrm, 0, sizeof(*alrm));
199187 	if (alarm != ALARM_DISABLED && offset != 0) {
200
-		rtc_time_to_tm(offset + alarm, tm);
188
+		rtc_time64_to_tm(offset + alarm, tm);
201189 
202
-		dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readalarm",
203
-			1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
204
-			tm->tm_hour, tm->tm_min, tm->tm_sec);
190
+		dev_dbg(dev, "%s: %ptR\n", __func__, tm);
205191 
206192 		if (rtt_readl(rtc, MR) & AT91_RTT_ALMIEN)
207193 			alrm->enabled = 1;
....@@ -217,11 +203,8 @@
217203 	unsigned long secs;
218204 	u32 offset;
219205 	u32 mr;
220
-	int err;
221206 
222
-	err = rtc_tm_to_time(tm, &secs);
223
-	if (err != 0)
224
-		return err;
207
+	secs = rtc_tm_to_time64(tm);
225208 
226209 	offset = gpbr_readl(rtc);
227210 	if (offset == 0) {
....@@ -242,9 +225,7 @@
242225 	if (alrm->enabled)
243226 		rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);
244227 
245
-	dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "setalarm",
246
-		tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour,
247
-		tm->tm_min, tm->tm_sec);
228
+	dev_dbg(dev, "%s: %ptR\n", __func__, tm);
248229 
249230 	return 0;
250231 }
....@@ -271,7 +252,7 @@
271252 	u32 mr = rtt_readl(rtc, MR);
272253 
273254 	seq_printf(seq, "update_IRQ\t: %s\n",
274
-			(mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
255
+		   (mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
275256 	return 0;
276257 }
277258 
....@@ -307,7 +288,7 @@
307288 	rtc->events = 0;
308289 
309290 	pr_debug("%s: num=%ld, events=0x%02lx\n", __func__,
310
-		rtc->events >> 8, rtc->events & 0x000000FF);
291
+		 rtc->events >> 8, rtc->events & 0x000000FF);
311292 }
312293 
313294 /*
....@@ -348,29 +329,20 @@
348329 	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
349330 };
350331 
351
-static const struct regmap_config gpbr_regmap_config = {
352
-	.name = "gpbr",
353
-	.reg_bits = 32,
354
-	.val_bits = 32,
355
-	.reg_stride = 4,
356
-};
357
-
358332 /*
359333  * Initialize and install RTC driver
360334  */
361335 static int at91_rtc_probe(struct platform_device *pdev)
362336 {
363
-	struct resource	*r;
364337 	struct sam9_rtc	*rtc;
365338 	int		ret, irq;
366339 	u32		mr;
367340 	unsigned int	sclk_rate;
341
+	struct of_phandle_args args;
368342 
369343 	irq = platform_get_irq(pdev, 0);
370
-	if (irq < 0) {
371
-		dev_err(&pdev->dev, "failed to get interrupt resource\n");
344
+	if (irq < 0)
372345 		return irq;
373
-	}
374346 
375347 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
376348 	if (!rtc)
....@@ -385,39 +357,18 @@
385357 
386358 	platform_set_drvdata(pdev, rtc);
387359 
388
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
389
-	rtc->rtt = devm_ioremap_resource(&pdev->dev, r);
360
+	rtc->rtt = devm_platform_ioremap_resource(pdev, 0);
390361 	if (IS_ERR(rtc->rtt))
391362 		return PTR_ERR(rtc->rtt);
392363 
393
-	if (!pdev->dev.of_node) {
394
-		/*
395
-		 * TODO: Remove this code chunk when removing non DT board
396
-		 * support. Remember to remove the gpbr_regmap_config
397
-		 * variable too.
398
-		 */
399
-		void __iomem *gpbr;
364
+	ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
365
+					       "atmel,rtt-rtc-time-reg", 1, 0,
366
+					       &args);
367
+	if (ret)
368
+		return ret;
400369 
401
-		r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
402
-		gpbr = devm_ioremap_resource(&pdev->dev, r);
403
-		if (IS_ERR(gpbr))
404
-			return PTR_ERR(gpbr);
405
-
406
-		rtc->gpbr = regmap_init_mmio(NULL, gpbr,
407
-					     &gpbr_regmap_config);
408
-	} else {
409
-		struct of_phandle_args args;
410
-
411
-		ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
412
-						"atmel,rtt-rtc-time-reg", 1, 0,
413
-						&args);
414
-		if (ret)
415
-			return ret;
416
-
417
-		rtc->gpbr = syscon_node_to_regmap(args.np);
418
-		rtc->gpbr_offset = args.args[0];
419
-	}
420
-
370
+	rtc->gpbr = syscon_node_to_regmap(args.np);
371
+	rtc->gpbr_offset = args.args[0];
421372 	if (IS_ERR(rtc->gpbr)) {
422373 		dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
423374 		return -ENOMEM;
....@@ -452,12 +403,14 @@
452403 	mr &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
453404 	rtt_writel(rtc, MR, mr);
454405 
455
-	rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
456
-					&at91_rtc_ops, THIS_MODULE);
406
+	rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev);
457407 	if (IS_ERR(rtc->rtcdev)) {
458408 		ret = PTR_ERR(rtc->rtcdev);
459409 		goto err_clk;
460410 	}
411
+
412
+	rtc->rtcdev->ops = &at91_rtc_ops;
413
+	rtc->rtcdev->range_max = U32_MAX;
461414 
462415 	/* register irq handler after we know what name we'll use */
463416 	ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
....@@ -476,9 +429,9 @@
476429 
477430 	if (gpbr_readl(rtc) == 0)
478431 		dev_warn(&pdev->dev, "%s: SET TIME!\n",
479
-				dev_name(&rtc->rtcdev->dev));
432
+			 dev_name(&rtc->rtcdev->dev));
480433 
481
-	return 0;
434
+	return rtc_register_device(rtc->rtcdev);
482435 
483436 err_clk:
484437 	clk_disable_unprepare(rtc->sclk);
....@@ -536,8 +489,9 @@
536489 			/* don't let RTTINC cause wakeups */
537490 			if (mr & AT91_RTT_RTTINCIEN)
538491 				rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
539
-		} else
492
+		} else {
540493 			rtt_writel(rtc, MR, mr & ~rtc->imr);
494
+		}
541495 	}
542496 
543497 	return 0;
....@@ -569,13 +523,11 @@
569523 
570524 static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
571525 
572
-#ifdef CONFIG_OF
573526 static const struct of_device_id at91_rtc_dt_ids[] = {
574527 	{ .compatible = "atmel,at91sam9260-rtt" },
575528 	{ /* sentinel */ }
576529 };
577530 MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
578
-#endif
579531 
580532 static struct platform_driver at91_rtc_driver = {
581533 	.probe		= at91_rtc_probe,