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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/drivers/rtc/rtc-at91rm9200.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *	Real Time Clock interface for Linux on Atmel AT91RM9200
34  *
....@@ -10,15 +11,10 @@
1011  *
1112  *	Based on sa1100-rtc.c by Nils Faerber
1213  *	Based on rtc.c by Paul Gortmaker
13
- *
14
- *	This program is free software; you can redistribute it and/or
15
- *	modify it under the terms of the GNU General Public License
16
- *	as published by the Free Software Foundation; either version
17
- *	2 of the License, or (at your option) any later version.
18
- *
1914  */
2015 
2116 #include <linux/bcd.h>
17
+#include <linux/bitfield.h>
2218 #include <linux/clk.h>
2319 #include <linux/completion.h>
2420 #include <linux/interrupt.h>
....@@ -35,7 +31,51 @@
3531 #include <linux/time.h>
3632 #include <linux/uaccess.h>
3733 
38
-#include "rtc-at91rm9200.h"
34
+#define	AT91_RTC_CR		0x00			/* Control Register */
35
+#define		AT91_RTC_UPDTIM		BIT(0)		/* Update Request Time Register */
36
+#define		AT91_RTC_UPDCAL		BIT(1)		/* Update Request Calendar Register */
37
+
38
+#define	AT91_RTC_MR		0x04			/* Mode Register */
39
+
40
+#define	AT91_RTC_TIMR		0x08			/* Time Register */
41
+#define		AT91_RTC_SEC		GENMASK(6, 0)	/* Current Second */
42
+#define		AT91_RTC_MIN		GENMASK(14, 8)	/* Current Minute */
43
+#define		AT91_RTC_HOUR		GENMASK(21, 16)	/* Current Hour */
44
+#define		AT91_RTC_AMPM		BIT(22)		/* Ante Meridiem Post Meridiem Indicator */
45
+
46
+#define	AT91_RTC_CALR		0x0c			/* Calendar Register */
47
+#define		AT91_RTC_CENT		GENMASK(6, 0)	/* Current Century */
48
+#define		AT91_RTC_YEAR		GENMASK(15, 8)	/* Current Year */
49
+#define		AT91_RTC_MONTH		GENMASK(20, 16)	/* Current Month */
50
+#define		AT91_RTC_DAY		GENMASK(23, 21)	/* Current Day */
51
+#define		AT91_RTC_DATE		GENMASK(29, 24)	/* Current Date */
52
+
53
+#define	AT91_RTC_TIMALR		0x10			/* Time Alarm Register */
54
+#define		AT91_RTC_SECEN		BIT(7)		/* Second Alarm Enable */
55
+#define		AT91_RTC_MINEN		BIT(15)		/* Minute Alarm Enable */
56
+#define		AT91_RTC_HOUREN		BIT(23)		/* Hour Alarm Enable */
57
+
58
+#define	AT91_RTC_CALALR		0x14			/* Calendar Alarm Register */
59
+#define		AT91_RTC_MTHEN		BIT(23)		/* Month Alarm Enable */
60
+#define		AT91_RTC_DATEEN		BIT(31)		/* Date Alarm Enable */
61
+
62
+#define	AT91_RTC_SR		0x18			/* Status Register */
63
+#define		AT91_RTC_ACKUPD		BIT(0)		/* Acknowledge for Update */
64
+#define		AT91_RTC_ALARM		BIT(1)		/* Alarm Flag */
65
+#define		AT91_RTC_SECEV		BIT(2)		/* Second Event */
66
+#define		AT91_RTC_TIMEV		BIT(3)		/* Time Event */
67
+#define		AT91_RTC_CALEV		BIT(4)		/* Calendar Event */
68
+
69
+#define	AT91_RTC_SCCR		0x1c			/* Status Clear Command Register */
70
+#define	AT91_RTC_IER		0x20			/* Interrupt Enable Register */
71
+#define	AT91_RTC_IDR		0x24			/* Interrupt Disable Register */
72
+#define	AT91_RTC_IMR		0x28			/* Interrupt Mask Register */
73
+
74
+#define	AT91_RTC_VER		0x2c			/* Valid Entry Register */
75
+#define		AT91_RTC_NVTIM		BIT(0)		/* Non valid Time */
76
+#define		AT91_RTC_NVCAL		BIT(1)		/* Non valid Calendar */
77
+#define		AT91_RTC_NVTIMALR	BIT(2)		/* Non valid Time Alarm */
78
+#define		AT91_RTC_NVCALALR	BIT(3)		/* Non valid Calendar Alarm */
3979 
4080 #define at91_rtc_read(field) \
4181 	readl_relaxed(at91_rtc_regs + field)
....@@ -122,20 +162,20 @@
122162 	} while ((time != at91_rtc_read(timereg)) ||
123163 			(date != at91_rtc_read(calreg)));
124164 
125
-	tm->tm_sec  = bcd2bin((time & AT91_RTC_SEC) >> 0);
126
-	tm->tm_min  = bcd2bin((time & AT91_RTC_MIN) >> 8);
127
-	tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16);
165
+	tm->tm_sec  = bcd2bin(FIELD_GET(AT91_RTC_SEC, time));
166
+	tm->tm_min  = bcd2bin(FIELD_GET(AT91_RTC_MIN, time));
167
+	tm->tm_hour = bcd2bin(FIELD_GET(AT91_RTC_HOUR, time));
128168 
129169 	/*
130170 	 * The Calendar Alarm register does not have a field for
131171 	 * the year - so these will return an invalid value.
132172 	 */
133173 	tm->tm_year  = bcd2bin(date & AT91_RTC_CENT) * 100;	/* century */
134
-	tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8);	/* year */
174
+	tm->tm_year += bcd2bin(FIELD_GET(AT91_RTC_YEAR, date));	/* year */
135175 
136
-	tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1;	/* day of the week [0-6], Sunday=0 */
137
-	tm->tm_mon  = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1;
138
-	tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24);
176
+	tm->tm_wday = bcd2bin(FIELD_GET(AT91_RTC_DAY, date)) - 1;	/* day of the week [0-6], Sunday=0 */
177
+	tm->tm_mon  = bcd2bin(FIELD_GET(AT91_RTC_MONTH, date)) - 1;
178
+	tm->tm_mday = bcd2bin(FIELD_GET(AT91_RTC_DATE, date));
139179 }
140180 
141181 /*
....@@ -147,9 +187,7 @@
147187 	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
148188 	tm->tm_year = tm->tm_year - 1900;
149189 
150
-	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
151
-		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
152
-		tm->tm_hour, tm->tm_min, tm->tm_sec);
190
+	dev_dbg(dev, "%s(): %ptR\n", __func__, tm);
153191 
154192 	return 0;
155193 }
....@@ -161,9 +199,7 @@
161199 {
162200 	unsigned long cr;
163201 
164
-	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
165
-		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
166
-		tm->tm_hour, tm->tm_min, tm->tm_sec);
202
+	dev_dbg(dev, "%s(): %ptR\n", __func__, tm);
167203 
168204 	wait_for_completion(&at91_rtc_upd_rdy);
169205 
....@@ -176,16 +212,17 @@
176212 	at91_rtc_write_idr(AT91_RTC_ACKUPD);
177213 
178214 	at91_rtc_write(AT91_RTC_TIMR,
179
-			  bin2bcd(tm->tm_sec) << 0
180
-			| bin2bcd(tm->tm_min) << 8
181
-			| bin2bcd(tm->tm_hour) << 16);
215
+			  FIELD_PREP(AT91_RTC_SEC, bin2bcd(tm->tm_sec))
216
+			| FIELD_PREP(AT91_RTC_MIN, bin2bcd(tm->tm_min))
217
+			| FIELD_PREP(AT91_RTC_HOUR, bin2bcd(tm->tm_hour)));
182218 
183219 	at91_rtc_write(AT91_RTC_CALR,
184
-			  bin2bcd((tm->tm_year + 1900) / 100)	/* century */
185
-			| bin2bcd(tm->tm_year % 100) << 8	/* year */
186
-			| bin2bcd(tm->tm_mon + 1) << 16		/* tm_mon starts at zero */
187
-			| bin2bcd(tm->tm_wday + 1) << 21	/* day of the week [0-6], Sunday=0 */
188
-			| bin2bcd(tm->tm_mday) << 24);
220
+			  FIELD_PREP(AT91_RTC_CENT,
221
+				     bin2bcd((tm->tm_year + 1900) / 100))
222
+			| FIELD_PREP(AT91_RTC_YEAR, bin2bcd(tm->tm_year % 100))
223
+			| FIELD_PREP(AT91_RTC_MONTH, bin2bcd(tm->tm_mon + 1))
224
+			| FIELD_PREP(AT91_RTC_DAY, bin2bcd(tm->tm_wday + 1))
225
+			| FIELD_PREP(AT91_RTC_DATE, bin2bcd(tm->tm_mday)));
189226 
190227 	/* Restart Time/Calendar */
191228 	cr = at91_rtc_read(AT91_RTC_CR);
....@@ -209,8 +246,7 @@
209246 	alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM)
210247 			? 1 : 0;
211248 
212
-	dev_dbg(dev, "%s(): %02d-%02d %02d:%02d:%02d %sabled\n", __func__,
213
-		tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec,
249
+	dev_dbg(dev, "%s(): %ptR %sabled\n", __func__, tm,
214250 		alrm->enabled ? "en" : "dis");
215251 
216252 	return 0;
....@@ -221,25 +257,17 @@
221257  */
222258 static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
223259 {
224
-	struct rtc_time tm;
225
-
226
-	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
227
-
228
-	tm.tm_mon = alrm->time.tm_mon;
229
-	tm.tm_mday = alrm->time.tm_mday;
230
-	tm.tm_hour = alrm->time.tm_hour;
231
-	tm.tm_min = alrm->time.tm_min;
232
-	tm.tm_sec = alrm->time.tm_sec;
260
+	struct rtc_time tm = alrm->time;
233261 
234262 	at91_rtc_write_idr(AT91_RTC_ALARM);
235263 	at91_rtc_write(AT91_RTC_TIMALR,
236
-		  bin2bcd(tm.tm_sec) << 0
237
-		| bin2bcd(tm.tm_min) << 8
238
-		| bin2bcd(tm.tm_hour) << 16
264
+		  FIELD_PREP(AT91_RTC_SEC, bin2bcd(alrm->time.tm_sec))
265
+		| FIELD_PREP(AT91_RTC_MIN, bin2bcd(alrm->time.tm_min))
266
+		| FIELD_PREP(AT91_RTC_HOUR, bin2bcd(alrm->time.tm_hour))
239267 		| AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN);
240268 	at91_rtc_write(AT91_RTC_CALALR,
241
-		  bin2bcd(tm.tm_mon + 1) << 16		/* tm_mon starts at zero */
242
-		| bin2bcd(tm.tm_mday) << 24
269
+		  FIELD_PREP(AT91_RTC_MONTH, bin2bcd(alrm->time.tm_mon + 1))
270
+		| FIELD_PREP(AT91_RTC_DATE, bin2bcd(alrm->time.tm_mday))
243271 		| AT91_RTC_DATEEN | AT91_RTC_MTHEN);
244272 
245273 	if (alrm->enabled) {
....@@ -247,9 +275,7 @@
247275 		at91_rtc_write_ier(AT91_RTC_ALARM);
248276 	}
249277 
250
-	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
251
-		tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
252
-		tm.tm_min, tm.tm_sec);
278
+	dev_dbg(dev, "%s(): %ptR\n", __func__, &tm);
253279 
254280 	return 0;
255281 }
....@@ -263,20 +289,6 @@
263289 		at91_rtc_write_ier(AT91_RTC_ALARM);
264290 	} else
265291 		at91_rtc_write_idr(AT91_RTC_ALARM);
266
-
267
-	return 0;
268
-}
269
-/*
270
- * Provide additional RTC information in /proc/driver/rtc
271
- */
272
-static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
273
-{
274
-	unsigned long imr = at91_rtc_read_imr();
275
-
276
-	seq_printf(seq, "update_IRQ\t: %s\n",
277
-			(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
278
-	seq_printf(seq, "periodic_IRQ\t: %s\n",
279
-			(imr & AT91_RTC_SECEV) ? "yes" : "no");
280292 
281293 	return 0;
282294 }
....@@ -331,7 +343,6 @@
331343 	.use_shadow_imr	= true,
332344 };
333345 
334
-#ifdef CONFIG_OF
335346 static const struct of_device_id at91_rtc_dt_ids[] = {
336347 	{
337348 		.compatible = "atmel,at91rm9200-rtc",
....@@ -340,33 +351,22 @@
340351 		.compatible = "atmel,at91sam9x5-rtc",
341352 		.data = &at91sam9x5_config,
342353 	}, {
354
+		.compatible = "atmel,sama5d4-rtc",
355
+		.data = &at91rm9200_config,
356
+	}, {
357
+		.compatible = "atmel,sama5d2-rtc",
358
+		.data = &at91rm9200_config,
359
+	}, {
343360 		/* sentinel */
344361 	}
345362 };
346363 MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
347
-#endif
348
-
349
-static const struct at91_rtc_config *
350
-at91_rtc_get_config(struct platform_device *pdev)
351
-{
352
-	const struct of_device_id *match;
353
-
354
-	if (pdev->dev.of_node) {
355
-		match = of_match_node(at91_rtc_dt_ids, pdev->dev.of_node);
356
-		if (!match)
357
-			return NULL;
358
-		return (const struct at91_rtc_config *)match->data;
359
-	}
360
-
361
-	return &at91rm9200_config;
362
-}
363364 
364365 static const struct rtc_class_ops at91_rtc_ops = {
365366 	.read_time	= at91_rtc_readtime,
366367 	.set_time	= at91_rtc_settime,
367368 	.read_alarm	= at91_rtc_readalarm,
368369 	.set_alarm	= at91_rtc_setalarm,
369
-	.proc		= at91_rtc_proc,
370370 	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
371371 };
372372 
....@@ -379,7 +379,7 @@
379379 	struct resource *regs;
380380 	int ret = 0;
381381 
382
-	at91_rtc_config = at91_rtc_get_config(pdev);
382
+	at91_rtc_config = of_device_get_match_data(&pdev->dev);
383383 	if (!at91_rtc_config)
384384 		return -ENODEV;
385385 
....@@ -390,10 +390,8 @@
390390 	}
391391 
392392 	irq = platform_get_irq(pdev, 0);
393
-	if (irq < 0) {
394
-		dev_err(&pdev->dev, "no irq resource defined\n");
393
+	if (irq < 0)
395394 		return -ENXIO;
396
-	}
397395 
398396 	at91_rtc_regs = devm_ioremap(&pdev->dev, regs->start,
399397 				     resource_size(regs));