drivers/rtc/rtc-loongson.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Loongson RTC driver
5  * Maintained out-of-tree by Huacai Chen <chenhuacai@kernel.org>.
7  *                           Binbin Zhou <zhoubinbin@loongson.cn>
20 #define TOY_WRITE0_REG		0x24 /* TOY low 32-bits value (write-only) */
21 #define TOY_WRITE1_REG		0x28 /* TOY high 32-bits value (write-only) */
22 #define TOY_READ0_REG		0x2c /* TOY low 32-bits value (read-only) */
23 #define TOY_READ1_REG		0x30 /* TOY high 32-bits value (read-only) */
26 #define TOY_MATCH2_REG		0x3c /* TOY timing interrupt 2 */
31 #define RTC_WRITE0_REG		0x64 /* RTC counters value (write-only) */
32 #define RTC_READ0_REG		0x68 /* RTC counters value (read-only) */
35 #define RTC_MATCH2_REG		0x74 /* RTC timing interrupt 2 */
45 /* bitmask of TOY_MATCH0/1/2_REG */
56 #define OSC_ENABLE		BIT(8) /* 1: 32.768k crystal enable */
66  * According to the LS1C manual, RTC_CTRL and alarm-related registers are not defined.
116 	rtc_update_irq(priv->rtcdev, 1, RTC_AF | RTC_IRQF);  in loongson_rtc_isr()
125 	spin_lock(&priv->lock);  in loongson_rtc_handler()
127 	writel(readl(priv->pm_base + PM1_EN_REG) & ~RTC_EN,  in loongson_rtc_handler()
128 	       priv->pm_base + PM1_EN_REG);  in loongson_rtc_handler()
131 	writel(RTC_STS, priv->pm_base + PM1_STS_REG);  in loongson_rtc_handler()
132 	spin_unlock(&priv->lock);  in loongson_rtc_handler()
138 	return regmap_write(priv->regmap, TOY_MATCH0_REG, 0);  in loongson_rtc_handler()
145 	if (priv->config->flags & LS1C_RTC_CTRL_WORKAROUND)  in loongson_rtc_set_enabled()
149 	return regmap_update_bits(priv->regmap, RTC_CTRL_REG, TOY_ENABLE_MASK,  in loongson_rtc_set_enabled()
159 	if (priv->config->flags & LS1C_RTC_CTRL_WORKAROUND)  in loongson_rtc_get_enabled()
162 	ret = regmap_read(priv->regmap, RTC_CTRL_REG, &ctrl_data);  in loongson_rtc_get_enabled()
172 	u32 rtc_data[2];  in loongson_rtc_read_time()
176 		return -EINVAL;  in loongson_rtc_read_time()
178 	ret = regmap_bulk_read(priv->regmap, TOY_READ0_REG, rtc_data,  in loongson_rtc_read_time()
183 	tm->tm_sec = FIELD_GET(TOY_SEC, rtc_data[0]);  in loongson_rtc_read_time()
184 	tm->tm_min = FIELD_GET(TOY_MIN, rtc_data[0]);  in loongson_rtc_read_time()
185 	tm->tm_hour = FIELD_GET(TOY_HOUR, rtc_data[0]);  in loongson_rtc_read_time()
186 	tm->tm_mday = FIELD_GET(TOY_DAY, rtc_data[0]);  in loongson_rtc_read_time()
187 	tm->tm_mon = FIELD_GET(TOY_MON, rtc_data[0]) - 1;  in loongson_rtc_read_time()
188 	tm->tm_year = rtc_data[1];  in loongson_rtc_read_time()
191 	priv->fix_year = tm->tm_year / 64 * 64;  in loongson_rtc_read_time()
198 	u32 rtc_data[2];  in loongson_rtc_set_time()
201 	rtc_data[0] = FIELD_PREP(TOY_SEC, tm->tm_sec)  in loongson_rtc_set_time()
202 		    | FIELD_PREP(TOY_MIN, tm->tm_min)  in loongson_rtc_set_time()
203 		    | FIELD_PREP(TOY_HOUR, tm->tm_hour)  in loongson_rtc_set_time()
204 		    | FIELD_PREP(TOY_DAY, tm->tm_mday)  in loongson_rtc_set_time()
205 		    | FIELD_PREP(TOY_MON, tm->tm_mon + 1);  in loongson_rtc_set_time()
206 	rtc_data[1] = tm->tm_year;  in loongson_rtc_set_time()
208 	ret = regmap_bulk_write(priv->regmap, TOY_WRITE0_REG, rtc_data,  in loongson_rtc_set_time()
222 	ret = regmap_read(priv->regmap, TOY_MATCH0_REG, &alarm_data);  in loongson_rtc_read_alarm()
226 	alrm->time.tm_sec = FIELD_GET(TOY_MATCH_SEC, alarm_data);  in loongson_rtc_read_alarm()
227 	alrm->time.tm_min = FIELD_GET(TOY_MATCH_MIN, alarm_data);  in loongson_rtc_read_alarm()
228 	alrm->time.tm_hour = FIELD_GET(TOY_MATCH_HOUR, alarm_data);  in loongson_rtc_read_alarm()
229 	alrm->time.tm_mday = FIELD_GET(TOY_MATCH_DAY, alarm_data);  in loongson_rtc_read_alarm()
230 	alrm->time.tm_mon = FIELD_GET(TOY_MATCH_MON, alarm_data) - 1;  in loongson_rtc_read_alarm()
242 	alrm->time.tm_year = FIELD_GET(TOY_MATCH_YEAR, alarm_data) + priv->fix_year;  in loongson_rtc_read_alarm()
244 	alrm->enabled = !!(readl(priv->pm_base + PM1_EN_REG) & RTC_EN);  in loongson_rtc_read_alarm()
253 	spin_lock(&priv->lock);  in loongson_rtc_alarm_irq_enable()
254 	val = readl(priv->pm_base + PM1_EN_REG);  in loongson_rtc_alarm_irq_enable()
257 	       priv->pm_base + PM1_EN_REG);  in loongson_rtc_alarm_irq_enable()
258 	spin_unlock(&priv->lock);  in loongson_rtc_alarm_irq_enable()
269 	alarm_data = FIELD_PREP(TOY_MATCH_SEC, alrm->time.tm_sec)  in loongson_rtc_set_alarm()
270 		   | FIELD_PREP(TOY_MATCH_MIN, alrm->time.tm_min)  in loongson_rtc_set_alarm()
271 		   | FIELD_PREP(TOY_MATCH_HOUR, alrm->time.tm_hour)  in loongson_rtc_set_alarm()
272 		   | FIELD_PREP(TOY_MATCH_DAY, alrm->time.tm_mday)  in loongson_rtc_set_alarm()
273 		   | FIELD_PREP(TOY_MATCH_MON, alrm->time.tm_mon + 1)  in loongson_rtc_set_alarm()
274 		   | FIELD_PREP(TOY_MATCH_YEAR, alrm->time.tm_year - priv->fix_year);  in loongson_rtc_set_alarm()
276 	ret = regmap_write(priv->regmap, TOY_MATCH0_REG, alarm_data);  in loongson_rtc_set_alarm()
280 	return loongson_rtc_alarm_irq_enable(dev, alrm->enabled);  in loongson_rtc_set_alarm()
296 	struct device *dev = &pdev->dev;  in loongson_rtc_probe()
300 		return -ENOMEM;  in loongson_rtc_probe()
307 	priv->regmap = devm_regmap_init_mmio(dev, regs,  in loongson_rtc_probe()
309 	if (IS_ERR(priv->regmap))  in loongson_rtc_probe()
310 		return dev_err_probe(dev, PTR_ERR(priv->regmap),  in loongson_rtc_probe()
313 	priv->config = device_get_match_data(dev);  in loongson_rtc_probe()
314 	spin_lock_init(&priv->lock);  in loongson_rtc_probe()
317 	priv->rtcdev = devm_rtc_allocate_device(dev);  in loongson_rtc_probe()
318 	if (IS_ERR(priv->rtcdev))  in loongson_rtc_probe()
319 		return dev_err_probe(dev, PTR_ERR(priv->rtcdev),  in loongson_rtc_probe()
326 				       0, "loongson-alarm", priv);  in loongson_rtc_probe()
331 		priv->pm_base = regs - priv->config->pm_offset;  in loongson_rtc_probe()
338 		/* Loongson-1C RTC does not support alarm */  in loongson_rtc_probe()
339 		clear_bit(RTC_FEATURE_ALARM, priv->rtcdev->features);  in loongson_rtc_probe()
342 	/* Loongson RTC does not support UIE */  in loongson_rtc_probe()
343 	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, priv->rtcdev->features);  in loongson_rtc_probe()
344 	priv->rtcdev->ops = &loongson_rtc_ops;  in loongson_rtc_probe()
345 	priv->rtcdev->range_min = RTC_TIMESTAMP_BEGIN_2000;  in loongson_rtc_probe()
346 	priv->rtcdev->range_max = RTC_TIMESTAMP_END_2099;  in loongson_rtc_probe()
348 	return devm_rtc_register_device(priv->rtcdev);  in loongson_rtc_probe()
353 	struct device *dev = &pdev->dev;  in loongson_rtc_remove()
356 	if (!test_bit(RTC_FEATURE_ALARM, priv->rtcdev->features))  in loongson_rtc_remove()
368 	{ .compatible = "loongson,ls1b-rtc", .data = &ls1b_rtc_config },
369 	{ .compatible = "loongson,ls1c-rtc", .data = &ls1c_rtc_config },
370 	{ .compatible = "loongson,ls7a-rtc", .data = &generic_rtc_config },
371 	{ .compatible = "loongson,ls2k1000-rtc", .data = &ls2k1000_rtc_config },
386 		.name	= "loongson-rtc",
393 MODULE_DESCRIPTION("Loongson RTC driver");
394 MODULE_AUTHOR("Binbin Zhou <zhoubinbin@loongson.cn>");