1 // SPDX-License-Identifier: GPL-2.0-only
25 #define DS1511_SEC		0x0
26 #define DS1511_MIN		0x1
27 #define DS1511_HOUR		0x2
28 #define DS1511_DOW		0x3
29 #define DS1511_DOM		0x4
30 #define DS1511_MONTH		0x5
31 #define DS1511_YEAR		0x6
32 #define DS1511_CENTURY		0x7
33 #define DS1511_AM1_SEC		0x8
34 #define DS1511_AM2_MIN		0x9
35 #define DS1511_AM3_HOUR		0xa
36 #define DS1511_AM4_DATE		0xb
37 #define DS1511_WD_MSEC		0xc
38 #define DS1511_WD_SEC		0xd
39 #define DS1511_CONTROL_A	0xe
40 #define DS1511_CONTROL_B	0xf
41 #define DS1511_RAMADDR_LSB	0x10
42 #define DS1511_RAMDATA		0x13
44 #define DS1511_BLF1	0x80
45 #define DS1511_BLF2	0x40
46 #define DS1511_PRS	0x20
47 #define DS1511_PAB	0x10
48 #define DS1511_TDF	0x08
49 #define DS1511_KSF	0x04
50 #define DS1511_WDF	0x02
51 #define DS1511_IRQF	0x01
52 #define DS1511_TE	0x80
53 #define DS1511_CS	0x40
54 #define DS1511_BME	0x20
55 #define DS1511_TPE	0x10
56 #define DS1511_TIE	0x08
57 #define DS1511_KIE	0x04
58 #define DS1511_WDE	0x02
59 #define DS1511_WDS	0x01
60 #define DS1511_RAM_MAX	0x100
96 	u8 mon, day, dow, hrs, min, sec, yrs, cen;  in ds1511_rtc_set_time()  local
99 	yrs = rtc_tm->tm_year % 100;  in ds1511_rtc_set_time()
100 	cen = 19 + rtc_tm->tm_year / 100;  in ds1511_rtc_set_time()
101 	mon = rtc_tm->tm_mon + 1;   /* tm_mon starts at zero */  in ds1511_rtc_set_time()
102 	day = rtc_tm->tm_mday;  in ds1511_rtc_set_time()
103 	dow = rtc_tm->tm_wday & 0x7; /* automatic BCD */  in ds1511_rtc_set_time()
104 	hrs = rtc_tm->tm_hour;  in ds1511_rtc_set_time()
105 	min = rtc_tm->tm_min;  in ds1511_rtc_set_time()
106 	sec = rtc_tm->tm_sec;  in ds1511_rtc_set_time()
111 	sec = bin2bcd(sec) & 0x7f;  in ds1511_rtc_set_time()
112 	min = bin2bcd(min) & 0x7f;  in ds1511_rtc_set_time()
113 	hrs = bin2bcd(hrs) & 0x3f;  in ds1511_rtc_set_time()
114 	day = bin2bcd(day) & 0x3f;  in ds1511_rtc_set_time()
115 	mon = bin2bcd(mon) & 0x1f;  in ds1511_rtc_set_time()
116 	yrs = bin2bcd(yrs) & 0xff;  in ds1511_rtc_set_time()
117 	cen = bin2bcd(cen) & 0xff;  in ds1511_rtc_set_time()
123 	rtc_write((rtc_read(DS1511_MONTH) & 0xe0) | mon, DS1511_MONTH);  in ds1511_rtc_set_time()
132 	return 0;  in ds1511_rtc_set_time()
143 	rtc_tm->tm_sec = rtc_read(DS1511_SEC) & 0x7f;  in ds1511_rtc_read_time()
144 	rtc_tm->tm_min = rtc_read(DS1511_MIN) & 0x7f;  in ds1511_rtc_read_time()
145 	rtc_tm->tm_hour = rtc_read(DS1511_HOUR) & 0x3f;  in ds1511_rtc_read_time()
146 	rtc_tm->tm_mday = rtc_read(DS1511_DOM) & 0x3f;  in ds1511_rtc_read_time()
147 	rtc_tm->tm_wday = rtc_read(DS1511_DOW) & 0x7;  in ds1511_rtc_read_time()
148 	rtc_tm->tm_mon = rtc_read(DS1511_MONTH) & 0x1f;  in ds1511_rtc_read_time()
149 	rtc_tm->tm_year = rtc_read(DS1511_YEAR) & 0x7f;  in ds1511_rtc_read_time()
155 	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);  in ds1511_rtc_read_time()
156 	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);  in ds1511_rtc_read_time()
157 	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);  in ds1511_rtc_read_time()
158 	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);  in ds1511_rtc_read_time()
159 	rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday);  in ds1511_rtc_read_time()
160 	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);  in ds1511_rtc_read_time()
161 	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);  in ds1511_rtc_read_time()
168 	century += rtc_tm->tm_year;  in ds1511_rtc_read_time()
169 	rtc_tm->tm_year = century - 1900;  in ds1511_rtc_read_time()
171 	rtc_tm->tm_mon--;  in ds1511_rtc_read_time()
173 	return 0;  in ds1511_rtc_read_time()
178 	rtc_write(rtc_read(DS1511_CONTROL_B) | (enabled ? DS1511_TIE : 0), DS1511_CONTROL_B);  in ds1511_rtc_alarm_enable()
186 	spin_lock_irqsave(&ds1511->lock, flags);  in ds1511_rtc_set_alarm()
187 	rtc_write(bin2bcd(alrm->time.tm_mday) & 0x3f, DS1511_AM4_DATE);  in ds1511_rtc_set_alarm()
188 	rtc_write(bin2bcd(alrm->time.tm_hour) & 0x3f, DS1511_AM3_HOUR);  in ds1511_rtc_set_alarm()
189 	rtc_write(bin2bcd(alrm->time.tm_min) & 0x7f, DS1511_AM2_MIN);  in ds1511_rtc_set_alarm()
190 	rtc_write(bin2bcd(alrm->time.tm_sec) & 0x7f, DS1511_AM1_SEC);  in ds1511_rtc_set_alarm()
191 	ds1511_rtc_alarm_enable(alrm->enabled);  in ds1511_rtc_set_alarm()
194 	spin_unlock_irqrestore(&ds1511->lock, flags);  in ds1511_rtc_set_alarm()
196 	return 0;  in ds1511_rtc_set_alarm()
201 	alrm->time.tm_mday = bcd2bin(rtc_read(DS1511_AM4_DATE) & 0x3f);  in ds1511_rtc_read_alarm()
202 	alrm->time.tm_hour = bcd2bin(rtc_read(DS1511_AM3_HOUR) & 0x3f);  in ds1511_rtc_read_alarm()
203 	alrm->time.tm_min = bcd2bin(rtc_read(DS1511_AM2_MIN) & 0x7f);  in ds1511_rtc_read_alarm()
204 	alrm->time.tm_sec = bcd2bin(rtc_read(DS1511_AM1_SEC) & 0x7f);  in ds1511_rtc_read_alarm()
205 	alrm->enabled = !!(rtc_read(DS1511_CONTROL_B) & DS1511_TIE);  in ds1511_rtc_read_alarm()
207 	return 0;  in ds1511_rtc_read_alarm()
214 	unsigned long events = 0;  in ds1511_interrupt()
216 	spin_lock(&ds1511->lock);  in ds1511_interrupt()
222 		rtc_update_irq(ds1511->rtc, 1, events);  in ds1511_interrupt()
224 	spin_unlock(&ds1511->lock);  in ds1511_interrupt()
233 	spin_lock_irqsave(&ds1511->lock, flags);  in ds1511_rtc_alarm_irq_enable()
235 	spin_unlock_irqrestore(&ds1511->lock, flags);  in ds1511_rtc_alarm_irq_enable()
237 	return 0;  in ds1511_rtc_alarm_irq_enable()
254 	for (i = 0; i < size; i++)  in ds1511_nvram_read()
257 	return 0;  in ds1511_nvram_read()
266 	for (i = 0; i < size; i++)  in ds1511_nvram_write()
269 	return 0;  in ds1511_nvram_write()
275 	int ret = 0;  in ds1511_rtc_probe()
283 		.priv = &pdev->dev,  in ds1511_rtc_probe()
286 	ds1511 = devm_kzalloc(&pdev->dev, sizeof(*ds1511), GFP_KERNEL);  in ds1511_rtc_probe()
288 		return -ENOMEM;  in ds1511_rtc_probe()
290 	ds1511_base = devm_platform_ioremap_resource(pdev, 0);  in ds1511_rtc_probe()
293 	ds1511->ioaddr = ds1511_base;  in ds1511_rtc_probe()
294 	ds1511->irq = platform_get_irq(pdev, 0);  in ds1511_rtc_probe()
300 	rtc_write(0, DS1511_CONTROL_A);  in ds1511_rtc_probe()
304 	rtc_write(0, DS1511_WD_MSEC);  in ds1511_rtc_probe()
305 	rtc_write(0, DS1511_WD_SEC);  in ds1511_rtc_probe()
312 	 * check for a dying bat-tree  in ds1511_rtc_probe()
315 		dev_warn(&pdev->dev, "voltage-low detected.\n");  in ds1511_rtc_probe()
317 	spin_lock_init(&ds1511->lock);  in ds1511_rtc_probe()
320 	ds1511->rtc = devm_rtc_allocate_device(&pdev->dev);  in ds1511_rtc_probe()
321 	if (IS_ERR(ds1511->rtc))  in ds1511_rtc_probe()
322 		return PTR_ERR(ds1511->rtc);  in ds1511_rtc_probe()
324 	ds1511->rtc->ops = &ds1511_rtc_ops;  in ds1511_rtc_probe()
325 	ds1511->rtc->range_max = RTC_TIMESTAMP_END_2099;  in ds1511_rtc_probe()
326 	ds1511->rtc->alarm_offset_max = 28 * 24 * 60 * 60 - 1;  in ds1511_rtc_probe()
332 	if (ds1511->irq > 0) {  in ds1511_rtc_probe()
334 		if (devm_request_irq(&pdev->dev, ds1511->irq, ds1511_interrupt,  in ds1511_rtc_probe()
335 			IRQF_SHARED, pdev->name, pdev) < 0) {  in ds1511_rtc_probe()
337 			dev_warn(&pdev->dev, "interrupt not available.\n");  in ds1511_rtc_probe()
338 			ds1511->irq = 0;  in ds1511_rtc_probe()
342 	if (ds1511->irq == 0)  in ds1511_rtc_probe()
343 		clear_bit(RTC_FEATURE_ALARM, ds1511->rtc->features);  in ds1511_rtc_probe()
345 	ret = devm_rtc_register_device(ds1511->rtc);  in ds1511_rtc_probe()
349 	devm_rtc_nvmem_register(ds1511->rtc, &ds1511_nvmem_cfg);  in ds1511_rtc_probe()
351 	return 0;  in ds1511_rtc_probe()