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
75 		.name = "imx1-rtc",
78 		.name = "imx21-rtc",
88 	{ .compatible = "fsl,imx1-rtc", .data = (const void *)IMX1_RTC },
89 	{ .compatible = "fsl,imx21-rtc", .data = (const void *)IMX21_RTC },
97 	return data->devtype == IMX1_RTC;  in is_imx1_rtc()
101  * This function is used to obtain the RTC time or the alarm value in
107 	void __iomem *ioaddr = pdata->ioaddr;  in get_alarm_or_time()
130  * This function sets the RTC alarm value or the time value.
136 	void __iomem *ioaddr = pdata->ioaddr;  in set_alarm_or_time()
142 	tod -= hr * 3600;  in set_alarm_or_time()
146 	sec = tod - min * 60;  in set_alarm_or_time()
165  * This function updates the RTC alarm registers and then clears all the
172 	void __iomem *ioaddr = pdata->ioaddr;  in rtc_update_alarm()
185 	void __iomem *ioaddr = pdata->ioaddr;  in mxc_rtc_irq_enable()
189 	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);  in mxc_rtc_irq_enable()
198 	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);  in mxc_rtc_irq_enable()
201 /* This function is the RTC interrupt service routine. */
206 	void __iomem *ioaddr = pdata->ioaddr;  in mxc_rtc_interrupt()
211 	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);  in mxc_rtc_interrupt()
219 		/* RTC alarm should be one-shot */  in mxc_rtc_interrupt()
220 		mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0);  in mxc_rtc_interrupt()
226 	rtc_update_irq(pdata->rtc, 1, events);  in mxc_rtc_interrupt()
227 	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);  in mxc_rtc_interrupt()
239  * This function reads the current RTC time into tm in Gregorian date.
245 	/* Avoid roll-over from reading the different registers */  in mxc_rtc_read_time()
256  * This function sets the internal RTC time based on tm in Gregorian date.
262 	/* Avoid roll-over from reading the different registers */  in mxc_rtc_set_time()
278 	void __iomem *ioaddr = pdata->ioaddr;  in mxc_rtc_read_alarm()
280 	rtc_time64_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time);  in mxc_rtc_read_alarm()
281 	alrm->pending = ((readw(ioaddr + RTC_RTCISR) & RTC_ALM_BIT)) ? 1 : 0;  in mxc_rtc_read_alarm()
287  * This function sets the RTC alarm based on passed in alrm.
293 	rtc_update_alarm(dev, &alrm->time);  in mxc_rtc_set_alarm()
295 	memcpy(&pdata->g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));  in mxc_rtc_set_alarm()
296 	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, alrm->enabled);  in mxc_rtc_set_alarm()
301 /* RTC layer */
314 	clk_disable_unprepare(pdata->clk_ref);  in mxc_rtc_action()
315 	clk_disable_unprepare(pdata->clk_ipg);  in mxc_rtc_action()
320 	struct rtc_device *rtc;  in mxc_rtc_probe()  local
327 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);  in mxc_rtc_probe()
329 		return -ENOMEM;  in mxc_rtc_probe()
331 	of_id = of_match_device(imx_rtc_dt_ids, &pdev->dev);  in mxc_rtc_probe()
333 		pdata->devtype = (enum imx_rtc_type)of_id->data;  in mxc_rtc_probe()
335 		pdata->devtype = pdev->id_entry->driver_data;  in mxc_rtc_probe()
337 	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);  in mxc_rtc_probe()
338 	if (IS_ERR(pdata->ioaddr))  in mxc_rtc_probe()
339 		return PTR_ERR(pdata->ioaddr);  in mxc_rtc_probe()
341 	rtc = devm_rtc_allocate_device(&pdev->dev);  in mxc_rtc_probe()
342 	if (IS_ERR(rtc))  in mxc_rtc_probe()
343 		return PTR_ERR(rtc);  in mxc_rtc_probe()
345 	pdata->rtc = rtc;  in mxc_rtc_probe()
346 	rtc->ops = &mxc_rtc_ops;  in mxc_rtc_probe()
351 		rtc->range_max = (1 << 9) * 86400 - 1;  in mxc_rtc_probe()
358 		rtc->start_secs =  mktime64(tm.tm_year, 1, 1, 0, 0, 0);  in mxc_rtc_probe()
359 		rtc->set_start_time = true;  in mxc_rtc_probe()
362 		rtc->range_max = (1 << 16) * 86400ULL - 1;  in mxc_rtc_probe()
365 	pdata->clk_ipg = devm_clk_get(&pdev->dev, "ipg");  in mxc_rtc_probe()
366 	if (IS_ERR(pdata->clk_ipg)) {  in mxc_rtc_probe()
367 		dev_err(&pdev->dev, "unable to get ipg clock!\n");  in mxc_rtc_probe()
368 		return PTR_ERR(pdata->clk_ipg);  in mxc_rtc_probe()
371 	ret = clk_prepare_enable(pdata->clk_ipg);  in mxc_rtc_probe()
375 	pdata->clk_ref = devm_clk_get(&pdev->dev, "ref");  in mxc_rtc_probe()
376 	if (IS_ERR(pdata->clk_ref)) {  in mxc_rtc_probe()
377 		clk_disable_unprepare(pdata->clk_ipg);  in mxc_rtc_probe()
378 		dev_err(&pdev->dev, "unable to get ref clock!\n");  in mxc_rtc_probe()
379 		return PTR_ERR(pdata->clk_ref);  in mxc_rtc_probe()
382 	ret = clk_prepare_enable(pdata->clk_ref);  in mxc_rtc_probe()
384 		clk_disable_unprepare(pdata->clk_ipg);  in mxc_rtc_probe()
388 	ret = devm_add_action_or_reset(&pdev->dev, mxc_rtc_action, pdata);  in mxc_rtc_probe()
392 	rate = clk_get_rate(pdata->clk_ref);  in mxc_rtc_probe()
401 		dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);  in mxc_rtc_probe()
402 		return -EINVAL;  in mxc_rtc_probe()
406 	writew(reg, (pdata->ioaddr + RTC_RTCCTL));  in mxc_rtc_probe()
407 	if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) {  in mxc_rtc_probe()
408 		dev_err(&pdev->dev, "hardware module can't be enabled!\n");  in mxc_rtc_probe()
409 		return -EIO;  in mxc_rtc_probe()
414 	/* Configure and enable the RTC */  in mxc_rtc_probe()
415 	pdata->irq = platform_get_irq(pdev, 0);  in mxc_rtc_probe()
417 	if (pdata->irq >= 0 &&  in mxc_rtc_probe()
418 	    devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt,  in mxc_rtc_probe()
419 			     IRQF_SHARED, pdev->name, pdev) < 0) {  in mxc_rtc_probe()
420 		dev_warn(&pdev->dev, "interrupt not available.\n");  in mxc_rtc_probe()
421 		pdata->irq = -1;  in mxc_rtc_probe()
424 	if (pdata->irq >= 0) {  in mxc_rtc_probe()
425 		device_init_wakeup(&pdev->dev, 1);  in mxc_rtc_probe()
426 		ret = dev_pm_set_wake_irq(&pdev->dev, pdata->irq);  in mxc_rtc_probe()
428 			dev_err(&pdev->dev, "failed to enable irq wake\n");  in mxc_rtc_probe()
431 	ret = rtc_register_device(rtc);  in mxc_rtc_probe()
448 MODULE_DESCRIPTION("RTC driver for Freescale MXC");