1 // SPDX-License-Identifier: GPL-2.0
15 #include <linux/rtc.h>
17 /* RTC Registers */
45 	struct rtc_device	*rtc;  member
68 	xrtcdev->calibval &= RTC_CALIB_MASK;  in xlnx_rtc_set_time()
69 	writel(xrtcdev->calibval, (xrtcdev->reg_base + RTC_CALIB_WR));  in xlnx_rtc_set_time()
71 	writel(new_time, xrtcdev->reg_base + RTC_SET_TM_WR);  in xlnx_rtc_set_time()
74 	 * Clear the rtc interrupt status register after setting the  in xlnx_rtc_set_time()
77 	 * that one second has not elapsed yet since RTC was set and  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()
96 		 * RTC has updated the CURRENT_TIME with the time written into  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()
135 			status = readl(xrtcdev->reg_base + RTC_INT_STS);  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()
172 	/* Enable RTC switch to battery when VCC_PSAUX is not available */  in xlnx_init_rtc()
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()
181 	 * to correct RTC delay in frequency over period of time.  in xlnx_init_rtc()
183 	xrtcdev->calibval &= RTC_CALIB_MASK;  in xlnx_init_rtc()
184 	writel(xrtcdev->calibval, (xrtcdev->reg_base + RTC_CALIB_WR));  in xlnx_init_rtc()
200 	status = readl(xrtcdev->reg_base + RTC_INT_STS);  in xlnx_rtc_interrupt()
206 	writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_DIS);  in xlnx_rtc_interrupt()
209 		rtc_update_irq(xrtcdev->rtc, 1, RTC_IRQF | RTC_AF);  in xlnx_rtc_interrupt()
219 	xrtcdev = devm_kzalloc(&pdev->dev, sizeof(*xrtcdev), GFP_KERNEL);  in xlnx_rtc_probe()
221 		return -ENOMEM;  in xlnx_rtc_probe()
225 	xrtcdev->rtc = devm_rtc_allocate_device(&pdev->dev);  in xlnx_rtc_probe()
226 	if (IS_ERR(xrtcdev->rtc))  in xlnx_rtc_probe()
227 		return PTR_ERR(xrtcdev->rtc);  in xlnx_rtc_probe()
229 	xrtcdev->rtc->ops = &xlnx_rtc_ops;  in xlnx_rtc_probe()
230 	xrtcdev->rtc->range_max = U32_MAX;  in xlnx_rtc_probe()
232 	xrtcdev->reg_base = devm_platform_ioremap_resource(pdev, 0);  in xlnx_rtc_probe()
233 	if (IS_ERR(xrtcdev->reg_base))  in xlnx_rtc_probe()
234 		return PTR_ERR(xrtcdev->reg_base);  in xlnx_rtc_probe()
236 	xrtcdev->alarm_irq = platform_get_irq_byname(pdev, "alarm");  in xlnx_rtc_probe()
237 	if (xrtcdev->alarm_irq < 0)  in xlnx_rtc_probe()
238 		return xrtcdev->alarm_irq;  in xlnx_rtc_probe()
239 	ret = devm_request_irq(&pdev->dev, xrtcdev->alarm_irq,  in xlnx_rtc_probe()
241 			       dev_name(&pdev->dev), xrtcdev);  in xlnx_rtc_probe()
243 		dev_err(&pdev->dev, "request irq failed\n");  in xlnx_rtc_probe()
247 	xrtcdev->sec_irq = platform_get_irq_byname(pdev, "sec");  in xlnx_rtc_probe()
248 	if (xrtcdev->sec_irq < 0)  in xlnx_rtc_probe()
249 		return xrtcdev->sec_irq;  in xlnx_rtc_probe()
250 	ret = devm_request_irq(&pdev->dev, xrtcdev->sec_irq,  in xlnx_rtc_probe()
252 			       dev_name(&pdev->dev), xrtcdev);  in xlnx_rtc_probe()
254 		dev_err(&pdev->dev, "request irq failed\n");  in xlnx_rtc_probe()
258 	ret = of_property_read_u32(pdev->dev.of_node, "calibration",  in xlnx_rtc_probe()
259 				   &xrtcdev->calibval);  in xlnx_rtc_probe()
261 		xrtcdev->calibval = RTC_CALIB_DEF;  in xlnx_rtc_probe()
265 	device_init_wakeup(&pdev->dev, 1);  in xlnx_rtc_probe()
267 	return rtc_register_device(xrtcdev->rtc);  in xlnx_rtc_probe()
272 	xlnx_rtc_alarm_irq_enable(&pdev->dev, 0);  in xlnx_rtc_remove()
273 	device_init_wakeup(&pdev->dev, 0);  in xlnx_rtc_remove()
283 		enable_irq_wake(xrtcdev->alarm_irq);  in xlnx_rtc_suspend()
295 		disable_irq_wake(xrtcdev->alarm_irq);  in xlnx_rtc_resume()
305 	{.compatible = "xlnx,zynqmp-rtc" },
322 MODULE_DESCRIPTION("Xilinx Zynq MPSoC RTC driver");