[linux-2.6-block.git] / drivers / rtc / rtc-lpc24xx.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * RTC driver for NXP LPC178x/18xx/43xx Real-Time Clock (RTC)
 *
 * Copyright (C) 2011 NXP Semiconductors
 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>

/* LPC24xx RTC register offsets and bits */
#define LPC24XX_ILR		0x00
#define  LPC24XX_RTCCIF		BIT(0)
#define  LPC24XX_RTCALF		BIT(1)
#define LPC24XX_CTC		0x04
#define LPC24XX_CCR		0x08
#define  LPC24XX_CLKEN		BIT(0)
#define  LPC178X_CCALEN		BIT(4)
#define LPC24XX_CIIR		0x0c
#define LPC24XX_AMR		0x10
#define  LPC24XX_ALARM_DISABLE	0xff
#define LPC24XX_CTIME0		0x14
#define LPC24XX_CTIME1		0x18
#define LPC24XX_CTIME2		0x1c
#define LPC24XX_SEC		0x20
#define LPC24XX_MIN		0x24
#define LPC24XX_HOUR		0x28
#define LPC24XX_DOM		0x2c
#define LPC24XX_DOW		0x30
#define LPC24XX_DOY		0x34
#define LPC24XX_MONTH		0x38
#define LPC24XX_YEAR		0x3c
#define LPC24XX_ALSEC		0x60
#define LPC24XX_ALMIN		0x64
#define LPC24XX_ALHOUR		0x68
#define LPC24XX_ALDOM		0x6c
#define LPC24XX_ALDOW		0x70
#define LPC24XX_ALDOY		0x74
#define LPC24XX_ALMON		0x78
#define LPC24XX_ALYEAR		0x7c

/* Macros to read fields in consolidated time (CT) registers */
#define CT0_SECS(x)		(((x) >> 0)  & 0x3f)
#define CT0_MINS(x)		(((x) >> 8)  & 0x3f)
#define CT0_HOURS(x)		(((x) >> 16) & 0x1f)
#define CT0_DOW(x)		(((x) >> 24) & 0x07)
#define CT1_DOM(x)		(((x) >> 0)  & 0x1f)
#define CT1_MONTH(x)		(((x) >> 8)  & 0x0f)
#define CT1_YEAR(x)		(((x) >> 16) & 0xfff)
#define CT2_DOY(x)		(((x) >> 0)  & 0xfff)

#define rtc_readl(dev, reg)		readl((dev)->rtc_base + (reg))
#define rtc_writel(dev, reg, val)	writel((val), (dev)->rtc_base + (reg))

struct lpc24xx_rtc {
	void __iomem *rtc_base;
	struct rtc_device *rtc;
	struct clk *clk_rtc;
	struct clk *clk_reg;
};

static int lpc24xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);

	/* Disable RTC during update */
	rtc_writel(rtc, LPC24XX_CCR, LPC178X_CCALEN);

	rtc_writel(rtc, LPC24XX_SEC,	tm->tm_sec);
	rtc_writel(rtc, LPC24XX_MIN,	tm->tm_min);
	rtc_writel(rtc, LPC24XX_HOUR,	tm->tm_hour);
	rtc_writel(rtc, LPC24XX_DOW,	tm->tm_wday);
	rtc_writel(rtc, LPC24XX_DOM,	tm->tm_mday);
	rtc_writel(rtc, LPC24XX_DOY,	tm->tm_yday);
	rtc_writel(rtc, LPC24XX_MONTH,	tm->tm_mon);
	rtc_writel(rtc, LPC24XX_YEAR,	tm->tm_year);

	rtc_writel(rtc, LPC24XX_CCR, LPC24XX_CLKEN | LPC178X_CCALEN);

	return 0;
}

static int lpc24xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
	u32 ct0, ct1, ct2;

	ct0 = rtc_readl(rtc, LPC24XX_CTIME0);
	ct1 = rtc_readl(rtc, LPC24XX_CTIME1);
	ct2 = rtc_readl(rtc, LPC24XX_CTIME2);

	tm->tm_sec  = CT0_SECS(ct0);
	tm->tm_min  = CT0_MINS(ct0);
	tm->tm_hour = CT0_HOURS(ct0);
	tm->tm_wday = CT0_DOW(ct0);
	tm->tm_mon  = CT1_MONTH(ct1);
	tm->tm_mday = CT1_DOM(ct1);
	tm->tm_year = CT1_YEAR(ct1);
	tm->tm_yday = CT2_DOY(ct2);

	return 0;
}

static int lpc24xx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
	struct rtc_time *tm = &wkalrm->time;

	tm->tm_sec  = rtc_readl(rtc, LPC24XX_ALSEC);
	tm->tm_min  = rtc_readl(rtc, LPC24XX_ALMIN);
	tm->tm_hour = rtc_readl(rtc, LPC24XX_ALHOUR);
	tm->tm_mday = rtc_readl(rtc, LPC24XX_ALDOM);
	tm->tm_wday = rtc_readl(rtc, LPC24XX_ALDOW);
	tm->tm_yday = rtc_readl(rtc, LPC24XX_ALDOY);
	tm->tm_mon  = rtc_readl(rtc, LPC24XX_ALMON);
	tm->tm_year = rtc_readl(rtc, LPC24XX_ALYEAR);

	wkalrm->enabled = rtc_readl(rtc, LPC24XX_AMR) == 0;
	wkalrm->pending = !!(rtc_readl(rtc, LPC24XX_ILR) & LPC24XX_RTCCIF);

	return rtc_valid_tm(&wkalrm->time);
}

static int lpc24xx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
	struct rtc_time *tm = &wkalrm->time;

	/* Disable alarm irq during update */
	rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);

	rtc_writel(rtc, LPC24XX_ALSEC,  tm->tm_sec);
	rtc_writel(rtc, LPC24XX_ALMIN,  tm->tm_min);
	rtc_writel(rtc, LPC24XX_ALHOUR, tm->tm_hour);
	rtc_writel(rtc, LPC24XX_ALDOM,  tm->tm_mday);
	rtc_writel(rtc, LPC24XX_ALDOW,  tm->tm_wday);
	rtc_writel(rtc, LPC24XX_ALDOY,  tm->tm_yday);
	rtc_writel(rtc, LPC24XX_ALMON,  tm->tm_mon);
	rtc_writel(rtc, LPC24XX_ALYEAR, tm->tm_year);

	if (wkalrm->enabled)
		rtc_writel(rtc, LPC24XX_AMR, 0);

	return 0;
}

static int lpc24xx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
{
	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);

	if (enable)
		rtc_writel(rtc, LPC24XX_AMR, 0);
	else
		rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);

	return 0;
}

static irqreturn_t lpc24xx_rtc_interrupt(int irq, void *data)
{
	unsigned long events = RTC_IRQF;
	struct lpc24xx_rtc *rtc = data;
	u32 rtc_iir;

	/* Check interrupt cause */
	rtc_iir = rtc_readl(rtc, LPC24XX_ILR);
	if (rtc_iir & LPC24XX_RTCALF) {
		events |= RTC_AF;
		rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);
	}

	/* Clear interrupt status and report event */
	rtc_writel(rtc, LPC24XX_ILR, rtc_iir);
	rtc_update_irq(rtc->rtc, 1, events);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops lpc24xx_rtc_ops = {
	.read_time		= lpc24xx_rtc_read_time,
	.set_time		= lpc24xx_rtc_set_time,
	.read_alarm		= lpc24xx_rtc_read_alarm,
	.set_alarm		= lpc24xx_rtc_set_alarm,
	.alarm_irq_enable	= lpc24xx_rtc_alarm_irq_enable,
};

static int lpc24xx_rtc_probe(struct platform_device *pdev)
{
	struct lpc24xx_rtc *rtc;
	struct resource *res;
	int irq, ret;

	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	rtc->rtc_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(rtc->rtc_base))
		return PTR_ERR(rtc->rtc_base);

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_warn(&pdev->dev, "can't get interrupt resource\n");
		return irq;
	}

	rtc->clk_rtc = devm_clk_get(&pdev->dev, "rtc");
	if (IS_ERR(rtc->clk_rtc)) {
		dev_err(&pdev->dev, "error getting rtc clock\n");
		return PTR_ERR(rtc->clk_rtc);
	}

	rtc->clk_reg = devm_clk_get(&pdev->dev, "reg");
	if (IS_ERR(rtc->clk_reg)) {
		dev_err(&pdev->dev, "error getting reg clock\n");
		return PTR_ERR(rtc->clk_reg);
	}

	ret = clk_prepare_enable(rtc->clk_rtc);
	if (ret) {
		dev_err(&pdev->dev, "unable to enable rtc clock\n");
		return ret;
	}

	ret = clk_prepare_enable(rtc->clk_reg);
	if (ret) {
		dev_err(&pdev->dev, "unable to enable reg clock\n");
		goto disable_rtc_clk;
	}

	platform_set_drvdata(pdev, rtc);

	/* Clear any pending interrupts */
	rtc_writel(rtc, LPC24XX_ILR, LPC24XX_RTCCIF | LPC24XX_RTCALF);

	/* Enable RTC count */
	rtc_writel(rtc, LPC24XX_CCR, LPC24XX_CLKEN | LPC178X_CCALEN);

	ret = devm_request_irq(&pdev->dev, irq, lpc24xx_rtc_interrupt, 0,
			       pdev->name, rtc);
	if (ret < 0) {
		dev_warn(&pdev->dev, "can't request interrupt\n");
		goto disable_clks;
	}

	rtc->rtc = devm_rtc_device_register(&pdev->dev, "lpc24xx-rtc",
					    &lpc24xx_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc)) {
		dev_err(&pdev->dev, "can't register rtc device\n");
		ret = PTR_ERR(rtc->rtc);
		goto disable_clks;
	}

	return 0;

disable_clks:
	clk_disable_unprepare(rtc->clk_reg);
disable_rtc_clk:
	clk_disable_unprepare(rtc->clk_rtc);
	return ret;
}

static int lpc24xx_rtc_remove(struct platform_device *pdev)
{
	struct lpc24xx_rtc *rtc = platform_get_drvdata(pdev);

	/* Ensure all interrupt sources are masked */
	rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);
	rtc_writel(rtc, LPC24XX_CIIR, 0);

	rtc_writel(rtc, LPC24XX_CCR, LPC178X_CCALEN);

	clk_disable_unprepare(rtc->clk_rtc);
	clk_disable_unprepare(rtc->clk_reg);

	return 0;
}

static const struct of_device_id lpc24xx_rtc_match[] = {
	{ .compatible = "nxp,lpc1788-rtc" },
	{ }
};
MODULE_DEVICE_TABLE(of, lpc24xx_rtc_match);

static struct platform_driver lpc24xx_rtc_driver = {
	.probe	= lpc24xx_rtc_probe,
	.remove	= lpc24xx_rtc_remove,
	.driver	= {
		.name = "lpc24xx-rtc",
		.of_match_table	= lpc24xx_rtc_match,
	},
};
module_platform_driver(lpc24xx_rtc_driver);

MODULE_AUTHOR("Kevin Wells <wellsk40@gmail.com>");
MODULE_DESCRIPTION("RTC driver for the LPC178x/18xx/408x/43xx SoCs");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
c28b42e3 JE	2	/*
	3	* RTC driver for NXP LPC178x/18xx/43xx Real-Time Clock (RTC)
	4	*
	5	* Copyright (C) 2011 NXP Semiconductors
	6	* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
c28b42e3 JE	7	*/
	8
	9	#include <linux/clk.h>
	10	#include <linux/io.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/of.h>
	14	#include <linux/of_device.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/rtc.h>
	17
	18	/* LPC24xx RTC register offsets and bits */
	19	#define LPC24XX_ILR 0x00
	20	#define LPC24XX_RTCCIF BIT(0)
	21	#define LPC24XX_RTCALF BIT(1)
	22	#define LPC24XX_CTC 0x04
	23	#define LPC24XX_CCR 0x08
	24	#define LPC24XX_CLKEN BIT(0)
	25	#define LPC178X_CCALEN BIT(4)
	26	#define LPC24XX_CIIR 0x0c
	27	#define LPC24XX_AMR 0x10
	28	#define LPC24XX_ALARM_DISABLE 0xff
	29	#define LPC24XX_CTIME0 0x14
	30	#define LPC24XX_CTIME1 0x18
	31	#define LPC24XX_CTIME2 0x1c
	32	#define LPC24XX_SEC 0x20
	33	#define LPC24XX_MIN 0x24
	34	#define LPC24XX_HOUR 0x28
	35	#define LPC24XX_DOM 0x2c
	36	#define LPC24XX_DOW 0x30
	37	#define LPC24XX_DOY 0x34
	38	#define LPC24XX_MONTH 0x38
	39	#define LPC24XX_YEAR 0x3c
	40	#define LPC24XX_ALSEC 0x60
	41	#define LPC24XX_ALMIN 0x64
	42	#define LPC24XX_ALHOUR 0x68
	43	#define LPC24XX_ALDOM 0x6c
	44	#define LPC24XX_ALDOW 0x70
	45	#define LPC24XX_ALDOY 0x74
	46	#define LPC24XX_ALMON 0x78
	47	#define LPC24XX_ALYEAR 0x7c
	48
	49	/* Macros to read fields in consolidated time (CT) registers */
	50	#define CT0_SECS(x) (((x) >> 0) & 0x3f)
	51	#define CT0_MINS(x) (((x) >> 8) & 0x3f)
	52	#define CT0_HOURS(x) (((x) >> 16) & 0x1f)
	53	#define CT0_DOW(x) (((x) >> 24) & 0x07)
	54	#define CT1_DOM(x) (((x) >> 0) & 0x1f)
	55	#define CT1_MONTH(x) (((x) >> 8) & 0x0f)
	56	#define CT1_YEAR(x) (((x) >> 16) & 0xfff)
	57	#define CT2_DOY(x) (((x) >> 0) & 0xfff)
	58
	59	#define rtc_readl(dev, reg) readl((dev)->rtc_base + (reg))
	60	#define rtc_writel(dev, reg, val) writel((val), (dev)->rtc_base + (reg))
	61
	62	struct lpc24xx_rtc {
	63	void __iomem *rtc_base;
	64	struct rtc_device *rtc;
	65	struct clk *clk_rtc;
	66	struct clk *clk_reg;
	67	};
	68
	69	static int lpc24xx_rtc_set_time(struct device dev, struct rtc_time tm)
	70	{
71	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
72
73	/* Disable RTC during update */
74	rtc_writel(rtc, LPC24XX_CCR, LPC178X_CCALEN);
75
76	rtc_writel(rtc, LPC24XX_SEC, tm->tm_sec);
77	rtc_writel(rtc, LPC24XX_MIN, tm->tm_min);
78	rtc_writel(rtc, LPC24XX_HOUR, tm->tm_hour);
79	rtc_writel(rtc, LPC24XX_DOW, tm->tm_wday);
80	rtc_writel(rtc, LPC24XX_DOM, tm->tm_mday);
81	rtc_writel(rtc, LPC24XX_DOY, tm->tm_yday);
82	rtc_writel(rtc, LPC24XX_MONTH, tm->tm_mon);
83	rtc_writel(rtc, LPC24XX_YEAR, tm->tm_year);
84
85	rtc_writel(rtc, LPC24XX_CCR, LPC24XX_CLKEN \| LPC178X_CCALEN);
86
87	return 0;
88	}
89
90	static int lpc24xx_rtc_read_time(struct device dev, struct rtc_time tm)
91	{
92	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
93	u32 ct0, ct1, ct2;
94
95	ct0 = rtc_readl(rtc, LPC24XX_CTIME0);
96	ct1 = rtc_readl(rtc, LPC24XX_CTIME1);
97	ct2 = rtc_readl(rtc, LPC24XX_CTIME2);
98
99	tm->tm_sec = CT0_SECS(ct0);
100	tm->tm_min = CT0_MINS(ct0);
101	tm->tm_hour = CT0_HOURS(ct0);
102	tm->tm_wday = CT0_DOW(ct0);
103	tm->tm_mon = CT1_MONTH(ct1);
104	tm->tm_mday = CT1_DOM(ct1);
105	tm->tm_year = CT1_YEAR(ct1);
106	tm->tm_yday = CT2_DOY(ct2);
107
22652ba7	108	return 0;
c28b42e3 JE	109	}
	110
	111	static int lpc24xx_rtc_read_alarm(struct device dev, struct rtc_wkalrm wkalrm)
	112	{
	113	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
	114	struct rtc_time *tm = &wkalrm->time;
	115
	116	tm->tm_sec = rtc_readl(rtc, LPC24XX_ALSEC);
	117	tm->tm_min = rtc_readl(rtc, LPC24XX_ALMIN);
	118	tm->tm_hour = rtc_readl(rtc, LPC24XX_ALHOUR);
	119	tm->tm_mday = rtc_readl(rtc, LPC24XX_ALDOM);
	120	tm->tm_wday = rtc_readl(rtc, LPC24XX_ALDOW);
	121	tm->tm_yday = rtc_readl(rtc, LPC24XX_ALDOY);
	122	tm->tm_mon = rtc_readl(rtc, LPC24XX_ALMON);
	123	tm->tm_year = rtc_readl(rtc, LPC24XX_ALYEAR);
	124
	125	wkalrm->enabled = rtc_readl(rtc, LPC24XX_AMR) == 0;
	126	wkalrm->pending = !!(rtc_readl(rtc, LPC24XX_ILR) & LPC24XX_RTCCIF);
	127
	128	return rtc_valid_tm(&wkalrm->time);
	129	}
	130
	131	static int lpc24xx_rtc_set_alarm(struct device dev, struct rtc_wkalrm wkalrm)
	132	{
	133	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
	134	struct rtc_time *tm = &wkalrm->time;
	135
	136	/* Disable alarm irq during update */
	137	rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);
	138
	139	rtc_writel(rtc, LPC24XX_ALSEC, tm->tm_sec);
	140	rtc_writel(rtc, LPC24XX_ALMIN, tm->tm_min);
	141	rtc_writel(rtc, LPC24XX_ALHOUR, tm->tm_hour);
	142	rtc_writel(rtc, LPC24XX_ALDOM, tm->tm_mday);
	143	rtc_writel(rtc, LPC24XX_ALDOW, tm->tm_wday);
	144	rtc_writel(rtc, LPC24XX_ALDOY, tm->tm_yday);
	145	rtc_writel(rtc, LPC24XX_ALMON, tm->tm_mon);
	146	rtc_writel(rtc, LPC24XX_ALYEAR, tm->tm_year);
	147
	148	if (wkalrm->enabled)
	149	rtc_writel(rtc, LPC24XX_AMR, 0);
	150
	151	return 0;
	152	}
	153
	154	static int lpc24xx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
	155	{
	156	struct lpc24xx_rtc *rtc = dev_get_drvdata(dev);
	157
	158	if (enable)
	159	rtc_writel(rtc, LPC24XX_AMR, 0);
	160	else
	161	rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);
	162
	163	return 0;
	164	}
	165
	166	static irqreturn_t lpc24xx_rtc_interrupt(int irq, void *data)
	167	{
	168	unsigned long events = RTC_IRQF;
	169	struct lpc24xx_rtc *rtc = data;
	170	u32 rtc_iir;
	171
	172	/* Check interrupt cause */
173	rtc_iir = rtc_readl(rtc, LPC24XX_ILR);
174	if (rtc_iir & LPC24XX_RTCALF) {
175	events \|= RTC_AF;
176	rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);
177	}
178
179	/* Clear interrupt status and report event */
180	rtc_writel(rtc, LPC24XX_ILR, rtc_iir);
181	rtc_update_irq(rtc->rtc, 1, events);
182
183	return IRQ_HANDLED;
184	}
185
186	static const struct rtc_class_ops lpc24xx_rtc_ops = {
187	.read_time = lpc24xx_rtc_read_time,
188	.set_time = lpc24xx_rtc_set_time,
189	.read_alarm = lpc24xx_rtc_read_alarm,
190	.set_alarm = lpc24xx_rtc_set_alarm,
191	.alarm_irq_enable = lpc24xx_rtc_alarm_irq_enable,
192	};
193
194	static int lpc24xx_rtc_probe(struct platform_device *pdev)
195	{
196	struct lpc24xx_rtc *rtc;
197	struct resource *res;
198	int irq, ret;
199
200	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
201	if (!rtc)
202	return -ENOMEM;
203
204	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
205	rtc->rtc_base = devm_ioremap_resource(&pdev->dev, res);
206	if (IS_ERR(rtc->rtc_base))
207	return PTR_ERR(rtc->rtc_base);
208
209	irq = platform_get_irq(pdev, 0);
210	if (irq < 0) {
211	dev_warn(&pdev->dev, "can't get interrupt resource\n");
212	return irq;
213	}
214
215	rtc->clk_rtc = devm_clk_get(&pdev->dev, "rtc");
216	if (IS_ERR(rtc->clk_rtc)) {
217	dev_err(&pdev->dev, "error getting rtc clock\n");
218	return PTR_ERR(rtc->clk_rtc);
219	}
220
221	rtc->clk_reg = devm_clk_get(&pdev->dev, "reg");
222	if (IS_ERR(rtc->clk_reg)) {
223	dev_err(&pdev->dev, "error getting reg clock\n");
224	return PTR_ERR(rtc->clk_reg);
225	}
226
227	ret = clk_prepare_enable(rtc->clk_rtc);
228	if (ret) {
229	dev_err(&pdev->dev, "unable to enable rtc clock\n");
230	return ret;
231	}
232
233	ret = clk_prepare_enable(rtc->clk_reg);
234	if (ret) {
235	dev_err(&pdev->dev, "unable to enable reg clock\n");
236	goto disable_rtc_clk;
237	}
238
239	platform_set_drvdata(pdev, rtc);
240
241	/* Clear any pending interrupts */
242	rtc_writel(rtc, LPC24XX_ILR, LPC24XX_RTCCIF \| LPC24XX_RTCALF);
243
244	/* Enable RTC count */
245	rtc_writel(rtc, LPC24XX_CCR, LPC24XX_CLKEN \| LPC178X_CCALEN);
246
247	ret = devm_request_irq(&pdev->dev, irq, lpc24xx_rtc_interrupt, 0,
248	pdev->name, rtc);
249	if (ret < 0) {
250	dev_warn(&pdev->dev, "can't request interrupt\n");
251	goto disable_clks;
252	}
253
254	rtc->rtc = devm_rtc_device_register(&pdev->dev, "lpc24xx-rtc",
255	&lpc24xx_rtc_ops, THIS_MODULE);
256	if (IS_ERR(rtc->rtc)) {
257	dev_err(&pdev->dev, "can't register rtc device\n");
258	ret = PTR_ERR(rtc->rtc);
259	goto disable_clks;
260	}
261
262	return 0;
263
264	disable_clks:
265	clk_disable_unprepare(rtc->clk_reg);
266	disable_rtc_clk:
267	clk_disable_unprepare(rtc->clk_rtc);
268	return ret;
269	}
270
271	static int lpc24xx_rtc_remove(struct platform_device *pdev)
272	{
273	struct lpc24xx_rtc *rtc = platform_get_drvdata(pdev);
274
275	/* Ensure all interrupt sources are masked */
276	rtc_writel(rtc, LPC24XX_AMR, LPC24XX_ALARM_DISABLE);
277	rtc_writel(rtc, LPC24XX_CIIR, 0);
278
279	rtc_writel(rtc, LPC24XX_CCR, LPC178X_CCALEN);
280
281	clk_disable_unprepare(rtc->clk_rtc);
282	clk_disable_unprepare(rtc->clk_reg);
283
284	return 0;
285	}
286
287	static const struct of_device_id lpc24xx_rtc_match[] = {
288	{ .compatible = "nxp,lpc1788-rtc" },
289	{ }
290	};
291	MODULE_DEVICE_TABLE(of, lpc24xx_rtc_match);
292
293	static struct platform_driver lpc24xx_rtc_driver = {
294	.probe = lpc24xx_rtc_probe,
295	.remove = lpc24xx_rtc_remove,
296	.driver = {
297	.name = "lpc24xx-rtc",
298	.of_match_table = lpc24xx_rtc_match,
299	},
300	};
301	module_platform_driver(lpc24xx_rtc_driver);
302
303	MODULE_AUTHOR("Kevin Wells <wellsk40@gmail.com>");
304	MODULE_DESCRIPTION("RTC driver for the LPC178x/18xx/408x/43xx SoCs");
305	MODULE_LICENSE("GPL");