1 // SPDX-License-Identifier: GPL-2.0
47 #define RTC_MIN_OFFSET		-32768000
65 	 * The value written will be updated after 1 sec into the  in xlnx_rtc_set_time()
66 	 * seconds read register, so we need to program time +1 sec  in xlnx_rtc_set_time()
71 	writel(new_time, xrtcdev->reg_base + RTC_SET_TM_WR);  in xlnx_rtc_set_time()
81 	writel(RTC_INT_SEC, xrtcdev->reg_base + RTC_INT_STS);  in xlnx_rtc_set_time()
92 	status = readl(xrtcdev->reg_base + RTC_INT_STS);  in xlnx_rtc_read_time()
99 		read_time = readl(xrtcdev->reg_base + RTC_CUR_TM);  in xlnx_rtc_read_time()
105 		 * Since we add +1 sec while writing, we need to -1 sec while  in xlnx_rtc_read_time()
108 		read_time = readl(xrtcdev->reg_base + RTC_SET_TM_RD) - 1;  in xlnx_rtc_read_time()
119 	rtc_time64_to_tm(readl(xrtcdev->reg_base + RTC_ALRM), &alrm->time);  in xlnx_rtc_read_alarm()
120 	alrm->enabled = readl(xrtcdev->reg_base + RTC_INT_MASK) & RTC_INT_ALRM;  in xlnx_rtc_read_alarm()
129 	ulong timeout;  in xlnx_rtc_alarm_irq_enable()  local
131 	timeout = jiffies + msecs_to_jiffies(RTC_MSEC);  in xlnx_rtc_alarm_irq_enable()
135 			status = readl(xrtcdev->reg_base + RTC_INT_STS);  in xlnx_rtc_alarm_irq_enable()
139 			if (time_after_eq(jiffies, timeout)) {  in xlnx_rtc_alarm_irq_enable()
141 				return -ETIMEDOUT;  in xlnx_rtc_alarm_irq_enable()
143 			writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_STS);  in xlnx_rtc_alarm_irq_enable()
146 		writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_EN);  in xlnx_rtc_alarm_irq_enable()
148 		writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_DIS);  in xlnx_rtc_alarm_irq_enable()
159 	alarm_time = rtc_tm_to_time64(&alrm->time);  in xlnx_rtc_set_alarm()
161 	writel((u32)alarm_time, (xrtcdev->reg_base + RTC_ALRM));  in xlnx_rtc_set_alarm()
163 	xlnx_rtc_alarm_irq_enable(dev, alrm->enabled);  in xlnx_rtc_set_alarm()
173 	rtc_ctrl = readl(xrtcdev->reg_base + RTC_CTRL);  in xlnx_init_rtc()
175 	writel(rtc_ctrl, xrtcdev->reg_base + RTC_CTRL);  in xlnx_init_rtc()
182 	unsigned int tick_mult = do_div(rtc_ppb, xrtcdev->freq);  in xlnx_rtc_read_offset()
186 	calibval = readl(xrtcdev->reg_base + RTC_CALIB_RD);  in xlnx_rtc_read_offset()
189 	offset_val = offset_val - RTC_CALIB_DEF;  in xlnx_rtc_read_offset()
205 	unsigned int tick_mult = do_div(rtc_ppb, xrtcdev->freq);  in xlnx_rtc_set_offset()
212 		return -ERANGE;  in xlnx_rtc_set_offset()
221 			max_tick--;  in xlnx_rtc_set_offset()
243 	writel(calibval, (xrtcdev->reg_base + RTC_CALIB_WR));  in xlnx_rtc_set_offset()
263 	status = readl(xrtcdev->reg_base + RTC_INT_STS);  in xlnx_rtc_interrupt()
269 	writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_DIS);  in xlnx_rtc_interrupt()
272 		rtc_update_irq(xrtcdev->rtc, 1, RTC_IRQF | RTC_AF);  in xlnx_rtc_interrupt()
282 	xrtcdev = devm_kzalloc(&pdev->dev, sizeof(*xrtcdev), GFP_KERNEL);  in xlnx_rtc_probe()
284 		return -ENOMEM;  in xlnx_rtc_probe()
288 	xrtcdev->rtc = devm_rtc_allocate_device(&pdev->dev);  in xlnx_rtc_probe()
289 	if (IS_ERR(xrtcdev->rtc))  in xlnx_rtc_probe()
290 		return PTR_ERR(xrtcdev->rtc);  in xlnx_rtc_probe()
292 	xrtcdev->rtc->ops = &xlnx_rtc_ops;  in xlnx_rtc_probe()
293 	xrtcdev->rtc->range_max = U32_MAX;  in xlnx_rtc_probe()
295 	xrtcdev->reg_base = devm_platform_ioremap_resource(pdev, 0);  in xlnx_rtc_probe()
296 	if (IS_ERR(xrtcdev->reg_base))  in xlnx_rtc_probe()
297 		return PTR_ERR(xrtcdev->reg_base);  in xlnx_rtc_probe()
299 	xrtcdev->alarm_irq = platform_get_irq_byname(pdev, "alarm");  in xlnx_rtc_probe()
300 	if (xrtcdev->alarm_irq < 0)  in xlnx_rtc_probe()
301 		return xrtcdev->alarm_irq;  in xlnx_rtc_probe()
302 	ret = devm_request_irq(&pdev->dev, xrtcdev->alarm_irq,  in xlnx_rtc_probe()
304 			       dev_name(&pdev->dev), xrtcdev);  in xlnx_rtc_probe()
306 		dev_err(&pdev->dev, "request irq failed\n");  in xlnx_rtc_probe()
310 	xrtcdev->sec_irq = platform_get_irq_byname(pdev, "sec");  in xlnx_rtc_probe()
311 	if (xrtcdev->sec_irq < 0)  in xlnx_rtc_probe()
312 		return xrtcdev->sec_irq;  in xlnx_rtc_probe()
313 	ret = devm_request_irq(&pdev->dev, xrtcdev->sec_irq,  in xlnx_rtc_probe()
315 			       dev_name(&pdev->dev), xrtcdev);  in xlnx_rtc_probe()
317 		dev_err(&pdev->dev, "request irq failed\n");  in xlnx_rtc_probe()
322 	xrtcdev->rtc_clk = devm_clk_get_optional(&pdev->dev, "rtc");  in xlnx_rtc_probe()
323 	if (IS_ERR(xrtcdev->rtc_clk)) {  in xlnx_rtc_probe()
324 		if (PTR_ERR(xrtcdev->rtc_clk) != -EPROBE_DEFER)  in xlnx_rtc_probe()
325 			dev_warn(&pdev->dev, "Device clock not found.\n");  in xlnx_rtc_probe()
327 	xrtcdev->freq = clk_get_rate(xrtcdev->rtc_clk);  in xlnx_rtc_probe()
328 	if (!xrtcdev->freq) {  in xlnx_rtc_probe()
329 		ret = of_property_read_u32(pdev->dev.of_node, "calibration",  in xlnx_rtc_probe()
330 					   &xrtcdev->freq);  in xlnx_rtc_probe()
332 			xrtcdev->freq = RTC_CALIB_DEF;  in xlnx_rtc_probe()
334 	ret = readl(xrtcdev->reg_base + RTC_CALIB_RD);  in xlnx_rtc_probe()
336 		writel(xrtcdev->freq, (xrtcdev->reg_base + RTC_CALIB_WR));  in xlnx_rtc_probe()
340 	device_init_wakeup(&pdev->dev, true);  in xlnx_rtc_probe()
342 	return devm_rtc_register_device(xrtcdev->rtc);  in xlnx_rtc_probe()
347 	xlnx_rtc_alarm_irq_enable(&pdev->dev, 0);  in xlnx_rtc_remove()
348 	device_init_wakeup(&pdev->dev, false);  in xlnx_rtc_remove()
356 		enable_irq_wake(xrtcdev->alarm_irq);  in xlnx_rtc_suspend()
368 		disable_irq_wake(xrtcdev->alarm_irq);  in xlnx_rtc_resume()
378 	{.compatible = "xlnx,zynqmp-rtc" },