1 // SPDX-License-Identifier: GPL-2.0-only
3  * EPSON TOYOCOM RTC-7301SF/DG Driver
7  * Based on rtc-rp5c01.c
22 #define DRV_NAME "rtc-r7301"
24 #define RTC7301_1_SEC		0x0	/* Bank 0 and Band 1 */
25 #define RTC7301_10_SEC		0x1	/* Bank 0 and Band 1 */
27 #define RTC7301_1_MIN		0x2	/* Bank 0 and Band 1 */
28 #define RTC7301_10_MIN		0x3	/* Bank 0 and Band 1 */
29 #define RTC7301_1_HOUR		0x4	/* Bank 0 and Band 1 */
30 #define RTC7301_10_HOUR		0x5	/* Bank 0 and Band 1 */
31 #define RTC7301_DAY_OF_WEEK	0x6	/* Bank 0 and Band 1 */
32 #define RTC7301_1_DAY		0x7	/* Bank 0 and Band 1 */
33 #define RTC7301_10_DAY		0x8	/* Bank 0 and Band 1 */
34 #define RTC7301_1_MONTH		0x9	/* Bank 0 */
35 #define RTC7301_10_MONTH	0xa	/* Bank 0 */
36 #define RTC7301_1_YEAR		0xb	/* Bank 0 */
37 #define RTC7301_10_YEAR		0xc	/* Bank 0 */
38 #define RTC7301_100_YEAR	0xd	/* Bank 0 */
39 #define RTC7301_1000_YEAR	0xe	/* Bank 0 */
40 #define RTC7301_ALARM_CONTROL	0xe	/* Bank 1 */
43 #define RTC7301_TIMER_CONTROL	0xe	/* Bank 2 */
56 	u8 bank;  member
60  * When the device is memory-mapped, some platforms pack the registers into
61  * 32-bit access using the lower 8 bits at each 4-byte stride, while others
78 	int reg_stride = regmap_get_reg_stride(priv->regmap);  in rtc7301_read()
81 	regmap_read(priv->regmap, reg_stride * reg, &val);  in rtc7301_read()
88 	int reg_stride = regmap_get_reg_stride(priv->regmap);  in rtc7301_write()
90 	regmap_write(priv->regmap, reg_stride * reg, val);  in rtc7301_write()
96 	int reg_stride = regmap_get_reg_stride(priv->regmap);  in rtc7301_update_bits()
98 	regmap_update_bits(priv->regmap, reg_stride * reg, mask, val);  in rtc7301_update_bits()
105 	while (retries-- > 0) {  in rtc7301_wait_while_busy()
115 	return -ETIMEDOUT;  in rtc7301_wait_while_busy()
129 static void rtc7301_select_bank(struct rtc7301_priv *priv, u8 bank)  in rtc7301_select_bank()  argument
133 	if (bank == priv->bank)  in rtc7301_select_bank()
136 	if (bank & BIT(0))  in rtc7301_select_bank()
138 	if (bank & BIT(1))  in rtc7301_select_bank()
145 	priv->bank = bank;  in rtc7301_select_bank()
153 	tm->tm_sec = rtc7301_read(priv, RTC7301_1_SEC);  in rtc7301_get_time()
154 	tm->tm_sec += (rtc7301_read(priv, RTC7301_10_SEC) & ~RTC7301_AE) * 10;  in rtc7301_get_time()
155 	tm->tm_min = rtc7301_read(priv, RTC7301_1_MIN);  in rtc7301_get_time()
156 	tm->tm_min += (rtc7301_read(priv, RTC7301_10_MIN) & ~RTC7301_AE) * 10;  in rtc7301_get_time()
157 	tm->tm_hour = rtc7301_read(priv, RTC7301_1_HOUR);  in rtc7301_get_time()
158 	tm->tm_hour += (rtc7301_read(priv, RTC7301_10_HOUR) & ~RTC7301_AE) * 10;  in rtc7301_get_time()
159 	tm->tm_mday = rtc7301_read(priv, RTC7301_1_DAY);  in rtc7301_get_time()
160 	tm->tm_mday += (rtc7301_read(priv, RTC7301_10_DAY) & ~RTC7301_AE) * 10;  in rtc7301_get_time()
163 		tm->tm_wday = -1;  in rtc7301_get_time()
164 		tm->tm_mon = -1;  in rtc7301_get_time()
165 		tm->tm_year = -1;  in rtc7301_get_time()
166 		tm->tm_yday = -1;  in rtc7301_get_time()
167 		tm->tm_isdst = -1;  in rtc7301_get_time()
171 	tm->tm_wday = (rtc7301_read(priv, RTC7301_DAY_OF_WEEK) & ~RTC7301_AE);  in rtc7301_get_time()
172 	tm->tm_mon = rtc7301_read(priv, RTC7301_10_MONTH) * 10 +  in rtc7301_get_time()
173 		     rtc7301_read(priv, RTC7301_1_MONTH) - 1;  in rtc7301_get_time()
179 	tm->tm_year = year - 1900;  in rtc7301_get_time()
187 	rtc7301_write(priv, tm->tm_sec % 10, RTC7301_1_SEC);  in rtc7301_write_time()
188 	rtc7301_write(priv, tm->tm_sec / 10, RTC7301_10_SEC);  in rtc7301_write_time()
190 	rtc7301_write(priv, tm->tm_min % 10, RTC7301_1_MIN);  in rtc7301_write_time()
191 	rtc7301_write(priv, tm->tm_min / 10, RTC7301_10_MIN);  in rtc7301_write_time()
193 	rtc7301_write(priv, tm->tm_hour % 10, RTC7301_1_HOUR);  in rtc7301_write_time()
194 	rtc7301_write(priv, tm->tm_hour / 10, RTC7301_10_HOUR);  in rtc7301_write_time()
196 	rtc7301_write(priv, tm->tm_mday % 10, RTC7301_1_DAY);  in rtc7301_write_time()
197 	rtc7301_write(priv, tm->tm_mday / 10, RTC7301_10_DAY);  in rtc7301_write_time()
200 	rtc7301_write(priv, alarm ? RTC7301_AE : tm->tm_wday,  in rtc7301_write_time()
206 	rtc7301_write(priv, (tm->tm_mon + 1) % 10, RTC7301_1_MONTH);  in rtc7301_write_time()
207 	rtc7301_write(priv, (tm->tm_mon + 1) / 10, RTC7301_10_MONTH);  in rtc7301_write_time()
209 	year = tm->tm_year + 1900;  in rtc7301_write_time()
231 	spin_lock_irqsave(&priv->lock, flags);  in rtc7301_read_time()
239 	spin_unlock_irqrestore(&priv->lock, flags);  in rtc7301_read_time()
249 	spin_lock_irqsave(&priv->lock, flags);  in rtc7301_set_time()
257 	spin_unlock_irqrestore(&priv->lock, flags);  in rtc7301_set_time()
268 	if (priv->irq <= 0)  in rtc7301_read_alarm()
269 		return -EINVAL;  in rtc7301_read_alarm()
271 	spin_lock_irqsave(&priv->lock, flags);  in rtc7301_read_alarm()
274 	rtc7301_get_time(priv, &alarm->time, true);  in rtc7301_read_alarm()
278 	alarm->enabled = !!(alrm_ctrl & RTC7301_ALARM_CONTROL_AIE);  in rtc7301_read_alarm()
279 	alarm->pending = !!(alrm_ctrl & RTC7301_ALARM_CONTROL_AF);  in rtc7301_read_alarm()
281 	spin_unlock_irqrestore(&priv->lock, flags);  in rtc7301_read_alarm()
291 	if (priv->irq <= 0)  in rtc7301_set_alarm()
292 		return -EINVAL;  in rtc7301_set_alarm()
294 	spin_lock_irqsave(&priv->lock, flags);  in rtc7301_set_alarm()
297 	rtc7301_write_time(priv, &alarm->time, true);  in rtc7301_set_alarm()
298 	rtc7301_alarm_irq(priv, alarm->enabled);  in rtc7301_set_alarm()
300 	spin_unlock_irqrestore(&priv->lock, flags);  in rtc7301_set_alarm()
310 	if (priv->irq <= 0)  in rtc7301_alarm_irq_enable()
311 		return -EINVAL;  in rtc7301_alarm_irq_enable()
313 	spin_lock_irqsave(&priv->lock, flags);  in rtc7301_alarm_irq_enable()
318 	spin_unlock_irqrestore(&priv->lock, flags);  in rtc7301_alarm_irq_enable()
334 	struct rtc7301_priv *priv = dev_get_drvdata(rtc->dev.parent);  in rtc7301_irq_handler()
338 	spin_lock(&priv->lock);  in rtc7301_irq_handler()
349 	spin_unlock(&priv->lock);  in rtc7301_irq_handler()
358 	spin_lock_irqsave(&priv->lock, flags);  in rtc7301_init()
363 	spin_unlock_irqrestore(&priv->lock, flags);  in rtc7301_init()
375 	priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);  in rtc7301_rtc_probe()
377 		return -ENOMEM;  in rtc7301_rtc_probe()
383 	ret = device_property_read_u32(&dev->dev, "reg-io-width", &val);  in rtc7301_rtc_probe()
396 		dev_err(&dev->dev, "invalid reg-io-width %d\n", val);  in rtc7301_rtc_probe()
397 		return -EINVAL;  in rtc7301_rtc_probe()
400 	priv->regmap = devm_regmap_init_mmio(&dev->dev, regs,  in rtc7301_rtc_probe()
402 	if (IS_ERR(priv->regmap))  in rtc7301_rtc_probe()
403 		return PTR_ERR(priv->regmap);  in rtc7301_rtc_probe()
405 	priv->irq = platform_get_irq(dev, 0);  in rtc7301_rtc_probe()
407 	spin_lock_init(&priv->lock);  in rtc7301_rtc_probe()
408 	priv->bank = -1;  in rtc7301_rtc_probe()
414 	rtc = devm_rtc_device_register(&dev->dev, DRV_NAME, &rtc7301_rtc_ops,  in rtc7301_rtc_probe()
419 	if (priv->irq > 0) {  in rtc7301_rtc_probe()
420 		ret = devm_request_irq(&dev->dev, priv->irq,  in rtc7301_rtc_probe()
422 				       dev_name(&dev->dev), rtc);  in rtc7301_rtc_probe()
424 			priv->irq = 0;  in rtc7301_rtc_probe()
425 			dev_err(&dev->dev, "unable to request IRQ\n");  in rtc7301_rtc_probe()
427 			device_set_wakeup_capable(&dev->dev, true);  in rtc7301_rtc_probe()
441 		enable_irq_wake(priv->irq);  in rtc7301_suspend()
451 		disable_irq_wake(priv->irq);  in rtc7301_resume()
479 MODULE_DESCRIPTION("EPSON TOYOCOM RTC-7301SF/DG Driver");
480 MODULE_ALIAS("platform:rtc-r7301");