1 // SPDX-License-Identifier: GPL-2.0+
3  * Freescale FlexTimer Module (FTM) alarm device driver.
6  * Copyright 2019-2020 NXP
17 #include <linux/fsl/ftm.h>
47 	if (dev->big_endian)  in rtc_readl()
48 		return ioread32be(dev->base + reg);  in rtc_readl()
50 		return ioread32(dev->base + reg);  in rtc_readl()
55 	if (dev->big_endian)  in rtc_writel()
56 		iowrite32be(val, dev->base + reg);  in rtc_writel()
58 		iowrite32(val, dev->base + reg);  in rtc_writel()
87 	 *Fix errata A-007728 for flextimer  in ftm_irq_acknowledge()
88 	 *	If the FTM counter reaches the FTM_MOD value between  in ftm_irq_acknowledge()
100 	 *	FTMx_CONF[NUMTOF] was seted as nonzero and FTM counter  in ftm_irq_acknowledge()
104 	 *	(FTM counter doesn't always reache the FTM_MOD anyway),  in ftm_irq_acknowledge()
107 	while ((FTM_SC_TOF & rtc_readl(rtc, FTM_SC)) && timeout--)  in ftm_irq_acknowledge()
132 	 * The CNT register contains the FTM counter value.  in ftm_reset_counter()
153 	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);  in ftm_rtc_alarm_interrupt()
179  *	get time to setup alarm, so we are using system time
203  * So max alarm value is 262 (65536 / 250) seconds
211 	alm_time = rtc_tm_to_time64(&alm->time);  in ftm_rtc_set_alarm()
214 	cycle = (alm_time - ktime_get_real_seconds()) * rtc->alarm_freq;  in ftm_rtc_set_alarm()
216 		pr_err("Out of alarm range {0~262} seconds.\n");  in ftm_rtc_set_alarm()
217 		return -ERANGE;  in ftm_rtc_set_alarm()
225 	 * The TOF (the overflow flag) bit is set when the FTM counter  in ftm_rtc_set_alarm()
226 	 * changes from MOD to CNTIN. So we should using the cycle - 1.  in ftm_rtc_set_alarm()
228 	rtc_writel(rtc, FTM_MOD, cycle - 1);  in ftm_rtc_set_alarm()
250 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);  in ftm_rtc_probe()
252 		dev_err(&pdev->dev, "cannot alloc memory for rtc\n");  in ftm_rtc_probe()
253 		return -ENOMEM;  in ftm_rtc_probe()
258 	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);  in ftm_rtc_probe()
259 	if (IS_ERR(rtc->rtc_dev))  in ftm_rtc_probe()
260 		return PTR_ERR(rtc->rtc_dev);  in ftm_rtc_probe()
262 	rtc->base = devm_platform_ioremap_resource(pdev, 0);  in ftm_rtc_probe()
263 	if (IS_ERR(rtc->base)) {  in ftm_rtc_probe()
264 		dev_err(&pdev->dev, "cannot ioremap resource for rtc\n");  in ftm_rtc_probe()
265 		return PTR_ERR(rtc->base);  in ftm_rtc_probe()
272 	ret = devm_request_irq(&pdev->dev, irq, ftm_rtc_alarm_interrupt,  in ftm_rtc_probe()
273 			       0, dev_name(&pdev->dev), rtc);  in ftm_rtc_probe()
275 		dev_err(&pdev->dev, "failed to request irq\n");  in ftm_rtc_probe()
279 	rtc->big_endian =  in ftm_rtc_probe()
280 		device_property_read_bool(&pdev->dev, "big-endian");  in ftm_rtc_probe()
282 	rtc->alarm_freq = (u32)FIXED_FREQ_CLK / (u32)MAX_FREQ_DIV;  in ftm_rtc_probe()
283 	rtc->rtc_dev->ops = &ftm_rtc_ops;  in ftm_rtc_probe()
285 	device_init_wakeup(&pdev->dev, true);  in ftm_rtc_probe()
286 	ret = dev_pm_set_wake_irq(&pdev->dev, irq);  in ftm_rtc_probe()
288 		dev_err(&pdev->dev, "failed to enable irq wake\n");  in ftm_rtc_probe()
290 	ret = devm_rtc_register_device(rtc->rtc_dev);  in ftm_rtc_probe()
292 		dev_err(&pdev->dev, "can't register rtc device\n");  in ftm_rtc_probe()
300 	{ .compatible = "fsl,ls1012a-ftm-alarm", },
301 	{ .compatible = "fsl,ls1021a-ftm-alarm", },
302 	{ .compatible = "fsl,ls1028a-ftm-alarm", },
303 	{ .compatible = "fsl,ls1043a-ftm-alarm", },
304 	{ .compatible = "fsl,ls1046a-ftm-alarm", },
305 	{ .compatible = "fsl,ls1088a-ftm-alarm", },
306 	{ .compatible = "fsl,ls208xa-ftm-alarm", },
307 	{ .compatible = "fsl,lx2160a-ftm-alarm", },
321 		.name	= "ftm-alarm",
329 MODULE_DESCRIPTION("NXP/Freescale FlexTimer alarm driver");