1 // SPDX-License-Identifier: GPL-2.0+
3 // Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved.
6 #include <linux/rtc.h>
44 #define RTC_HOURMIN	0x00	/*  32bit rtc hour/min counter reg */
45 #define RTC_SECOND	0x04	/*  32bit rtc seconds counter reg */
46 #define RTC_ALRM_HM	0x08	/*  32bit rtc alarm hour/min reg */
47 #define RTC_ALRM_SEC	0x0C	/*  32bit rtc alarm seconds reg */
48 #define RTC_RTCCTL	0x10	/*  32bit rtc control reg */
49 #define RTC_RTCISR	0x14	/*  32bit rtc interrupt status reg */
50 #define RTC_RTCIENR	0x18	/*  32bit rtc interrupt enable reg */
51 #define RTC_STPWCH	0x1C	/*  32bit rtc stopwatch min reg */
52 #define RTC_DAYR	0x20	/*  32bit rtc days counter reg */
53 #define RTC_DAYALARM	0x24	/*  32bit rtc day alarm reg */
54 #define RTC_TEST1	0x28	/*  32bit rtc test reg 1 */
55 #define RTC_TEST2	0x2C	/*  32bit rtc test reg 2 */
56 #define RTC_TEST3	0x30	/*  32bit rtc test reg 3 */
64 	struct rtc_device *rtc;  member
74 	{ .compatible = "fsl,imx1-rtc", .data = (const void *)IMX1_RTC },
75 	{ .compatible = "fsl,imx21-rtc", .data = (const void *)IMX21_RTC },
82 	return data->devtype == IMX1_RTC;  in is_imx1_rtc()
86  * This function is used to obtain the RTC time or the alarm value in
92 	void __iomem *ioaddr = pdata->ioaddr;  in get_alarm_or_time()
115  * This function sets the RTC alarm value or the time value.
121 	void __iomem *ioaddr = pdata->ioaddr;  in set_alarm_or_time()
127 	tod -= hr * 3600;  in set_alarm_or_time()
131 	sec = tod - min * 60;  in set_alarm_or_time()
150  * This function updates the RTC alarm registers and then clears all the
157 	void __iomem *ioaddr = pdata->ioaddr;  in rtc_update_alarm()
170 	void __iomem *ioaddr = pdata->ioaddr;  in mxc_rtc_irq_enable()
174 	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);  in mxc_rtc_irq_enable()
183 	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);  in mxc_rtc_irq_enable()
186 /* This function is the RTC interrupt service routine. */
191 	void __iomem *ioaddr = pdata->ioaddr;  in mxc_rtc_interrupt()
195 	spin_lock(&pdata->rtc->irq_lock);  in mxc_rtc_interrupt()
203 		/* RTC alarm should be one-shot */  in mxc_rtc_interrupt()
204 		mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0);  in mxc_rtc_interrupt()
210 	rtc_update_irq(pdata->rtc, 1, events);  in mxc_rtc_interrupt()
211 	spin_unlock(&pdata->rtc->irq_lock);  in mxc_rtc_interrupt()
223  * This function reads the current RTC time into tm in Gregorian date.
229 	/* Avoid roll-over from reading the different registers */  in mxc_rtc_read_time()
240  * This function sets the internal RTC time based on tm in Gregorian date.
246 	/* Avoid roll-over from reading the different registers */  in mxc_rtc_set_time()
262 	void __iomem *ioaddr = pdata->ioaddr;  in mxc_rtc_read_alarm()
264 	rtc_time64_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time);  in mxc_rtc_read_alarm()
265 	alrm->pending = ((readw(ioaddr + RTC_RTCISR) & RTC_ALM_BIT)) ? 1 : 0;  in mxc_rtc_read_alarm()
271  * This function sets the RTC alarm based on passed in alrm.
277 	rtc_update_alarm(dev, &alrm->time);  in mxc_rtc_set_alarm()
279 	memcpy(&pdata->g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));  in mxc_rtc_set_alarm()
280 	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, alrm->enabled);  in mxc_rtc_set_alarm()
285 /* RTC layer */
298 	clk_disable_unprepare(pdata->clk_ref);  in mxc_rtc_action()
299 	clk_disable_unprepare(pdata->clk_ipg);  in mxc_rtc_action()
304 	struct rtc_device *rtc;  in mxc_rtc_probe()  local
310 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);  in mxc_rtc_probe()
312 		return -ENOMEM;  in mxc_rtc_probe()
314 	pdata->devtype = (enum imx_rtc_type)of_device_get_match_data(&pdev->dev);  in mxc_rtc_probe()
316 	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);  in mxc_rtc_probe()
317 	if (IS_ERR(pdata->ioaddr))  in mxc_rtc_probe()
318 		return PTR_ERR(pdata->ioaddr);  in mxc_rtc_probe()
320 	rtc = devm_rtc_allocate_device(&pdev->dev);  in mxc_rtc_probe()
321 	if (IS_ERR(rtc))  in mxc_rtc_probe()
322 		return PTR_ERR(rtc);  in mxc_rtc_probe()
324 	pdata->rtc = rtc;  in mxc_rtc_probe()
325 	rtc->ops = &mxc_rtc_ops;  in mxc_rtc_probe()
330 		rtc->range_max = (1 << 9) * 86400 - 1;  in mxc_rtc_probe()
337 		rtc->start_secs =  mktime64(tm.tm_year, 1, 1, 0, 0, 0);  in mxc_rtc_probe()
338 		rtc->set_start_time = true;  in mxc_rtc_probe()
341 		rtc->range_max = (1 << 16) * 86400ULL - 1;  in mxc_rtc_probe()
344 	pdata->clk_ipg = devm_clk_get(&pdev->dev, "ipg");  in mxc_rtc_probe()
345 	if (IS_ERR(pdata->clk_ipg)) {  in mxc_rtc_probe()
346 		dev_err(&pdev->dev, "unable to get ipg clock!\n");  in mxc_rtc_probe()
347 		return PTR_ERR(pdata->clk_ipg);  in mxc_rtc_probe()
350 	ret = clk_prepare_enable(pdata->clk_ipg);  in mxc_rtc_probe()
354 	pdata->clk_ref = devm_clk_get(&pdev->dev, "ref");  in mxc_rtc_probe()
355 	if (IS_ERR(pdata->clk_ref)) {  in mxc_rtc_probe()
356 		clk_disable_unprepare(pdata->clk_ipg);  in mxc_rtc_probe()
357 		dev_err(&pdev->dev, "unable to get ref clock!\n");  in mxc_rtc_probe()
358 		return PTR_ERR(pdata->clk_ref);  in mxc_rtc_probe()
361 	ret = clk_prepare_enable(pdata->clk_ref);  in mxc_rtc_probe()
363 		clk_disable_unprepare(pdata->clk_ipg);  in mxc_rtc_probe()
367 	ret = devm_add_action_or_reset(&pdev->dev, mxc_rtc_action, pdata);  in mxc_rtc_probe()
371 	rate = clk_get_rate(pdata->clk_ref);  in mxc_rtc_probe()
380 		dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);  in mxc_rtc_probe()
381 		return -EINVAL;  in mxc_rtc_probe()
385 	writew(reg, (pdata->ioaddr + RTC_RTCCTL));  in mxc_rtc_probe()
386 	if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) {  in mxc_rtc_probe()
387 		dev_err(&pdev->dev, "hardware module can't be enabled!\n");  in mxc_rtc_probe()
388 		return -EIO;  in mxc_rtc_probe()
393 	/* Configure and enable the RTC */  in mxc_rtc_probe()
394 	pdata->irq = platform_get_irq(pdev, 0);  in mxc_rtc_probe()
396 	if (pdata->irq >= 0 &&  in mxc_rtc_probe()
397 	    devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt,  in mxc_rtc_probe()
398 			     IRQF_SHARED, pdev->name, pdev) < 0) {  in mxc_rtc_probe()
399 		dev_warn(&pdev->dev, "interrupt not available.\n");  in mxc_rtc_probe()
400 		pdata->irq = -1;  in mxc_rtc_probe()
403 	if (pdata->irq >= 0) {  in mxc_rtc_probe()
404 		device_init_wakeup(&pdev->dev, 1);  in mxc_rtc_probe()
405 		ret = dev_pm_set_wake_irq(&pdev->dev, pdata->irq);  in mxc_rtc_probe()
407 			dev_err(&pdev->dev, "failed to enable irq wake\n");  in mxc_rtc_probe()
410 	ret = devm_rtc_register_device(rtc);  in mxc_rtc_probe()
426 MODULE_DESCRIPTION("RTC driver for Freescale MXC");