[mirror_ubuntu-bionic-kernel.git] / drivers / rtc / rtc-msm6242.c

/*
 *  Oki MSM6242 RTC Driver
 *
 *  Copyright 2009 Geert Uytterhoeven
 *
 *  Based on the A2000 TOD code in arch/m68k/amiga/config.c
 *  Copyright (C) 1993 Hamish Macdonald
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/slab.h>


enum {
	MSM6242_SECOND1		= 0x0,	/* 1-second digit register */
	MSM6242_SECOND10	= 0x1,	/* 10-second digit register */
	MSM6242_MINUTE1		= 0x2,	/* 1-minute digit register */
	MSM6242_MINUTE10	= 0x3,	/* 10-minute digit register */
	MSM6242_HOUR1		= 0x4,	/* 1-hour digit register */
	MSM6242_HOUR10		= 0x5,	/* PM/AM, 10-hour digit register */
	MSM6242_DAY1		= 0x6,	/* 1-day digit register */
	MSM6242_DAY10		= 0x7,	/* 10-day digit register */
	MSM6242_MONTH1		= 0x8,	/* 1-month digit register */
	MSM6242_MONTH10		= 0x9,	/* 10-month digit register */
	MSM6242_YEAR1		= 0xa,	/* 1-year digit register */
	MSM6242_YEAR10		= 0xb,	/* 10-year digit register */
	MSM6242_WEEK		= 0xc,	/* Week register */
	MSM6242_CD		= 0xd,	/* Control Register D */
	MSM6242_CE		= 0xe,	/* Control Register E */
	MSM6242_CF		= 0xf,	/* Control Register F */
};

#define MSM6242_HOUR10_AM	(0 << 2)
#define MSM6242_HOUR10_PM	(1 << 2)
#define MSM6242_HOUR10_HR_MASK	(3 << 0)

#define MSM6242_WEEK_SUNDAY	0
#define MSM6242_WEEK_MONDAY	1
#define MSM6242_WEEK_TUESDAY	2
#define MSM6242_WEEK_WEDNESDAY	3
#define MSM6242_WEEK_THURSDAY	4
#define MSM6242_WEEK_FRIDAY	5
#define MSM6242_WEEK_SATURDAY	6

#define MSM6242_CD_30_S_ADJ	(1 << 3)	/* 30-second adjustment */
#define MSM6242_CD_IRQ_FLAG	(1 << 2)
#define MSM6242_CD_BUSY		(1 << 1)
#define MSM6242_CD_HOLD		(1 << 0)

#define MSM6242_CE_T_MASK	(3 << 2)
#define MSM6242_CE_T_64HZ	(0 << 2)	/* period 1/64 second */
#define MSM6242_CE_T_1HZ	(1 << 2)	/* period 1 second */
#define MSM6242_CE_T_1MINUTE	(2 << 2)	/* period 1 minute */
#define MSM6242_CE_T_1HOUR	(3 << 2)	/* period 1 hour */

#define MSM6242_CE_ITRPT_STND	(1 << 1)
#define MSM6242_CE_MASK		(1 << 0)	/* STD.P output control */

#define MSM6242_CF_TEST		(1 << 3)
#define MSM6242_CF_12H		(0 << 2)
#define MSM6242_CF_24H		(1 << 2)
#define MSM6242_CF_STOP		(1 << 1)
#define MSM6242_CF_REST		(1 << 0)	/* reset */


struct msm6242_priv {
	u32 __iomem *regs;
	struct rtc_device *rtc;
};

static inline unsigned int msm6242_read(struct msm6242_priv *priv,
				       unsigned int reg)
{
	return __raw_readl(&priv->regs[reg]) & 0xf;
}

static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val,
				unsigned int reg)
{
	__raw_writel(val, &priv->regs[reg]);
}

static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val,
			       unsigned int reg)
{
	msm6242_write(priv, msm6242_read(priv, reg) | val, reg);
}

static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val,
				 unsigned int reg)
{
	msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg);
}

static void msm6242_lock(struct msm6242_priv *priv)
{
	int cnt = 5;

	msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);

	while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) {
		msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
		udelay(70);
		msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
		cnt--;
	}

	if (!cnt)
		pr_warn("timed out waiting for RTC (0x%x)\n",
			msm6242_read(priv, MSM6242_CD));
}

static void msm6242_unlock(struct msm6242_priv *priv)
{
	msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
}

static int msm6242_read_time(struct device *dev, struct rtc_time *tm)
{
	struct msm6242_priv *priv = dev_get_drvdata(dev);

	msm6242_lock(priv);

	tm->tm_sec  = msm6242_read(priv, MSM6242_SECOND10) * 10 +
		      msm6242_read(priv, MSM6242_SECOND1);
	tm->tm_min  = msm6242_read(priv, MSM6242_MINUTE10) * 10 +
		      msm6242_read(priv, MSM6242_MINUTE1);
	tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10) &
		       MSM6242_HOUR10_HR_MASK) * 10 +
		      msm6242_read(priv, MSM6242_HOUR1);
	tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 +
		      msm6242_read(priv, MSM6242_DAY1);
	tm->tm_wday = msm6242_read(priv, MSM6242_WEEK);
	tm->tm_mon  = msm6242_read(priv, MSM6242_MONTH10) * 10 +
		      msm6242_read(priv, MSM6242_MONTH1) - 1;
	tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 +
		      msm6242_read(priv, MSM6242_YEAR1);
	if (tm->tm_year <= 69)
		tm->tm_year += 100;

	if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) {
		unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) &
				  MSM6242_HOUR10_PM;
		if (!pm && tm->tm_hour == 12)
			tm->tm_hour = 0;
		else if (pm && tm->tm_hour != 12)
			tm->tm_hour += 12;
	}

	msm6242_unlock(priv);

	return rtc_valid_tm(tm);
}

static int msm6242_set_time(struct device *dev, struct rtc_time *tm)
{
	struct msm6242_priv *priv = dev_get_drvdata(dev);

	msm6242_lock(priv);

	msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10);
	msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1);
	msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10);
	msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1);
	if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)
		msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
	else if (tm->tm_hour >= 12)
		msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10,
			      MSM6242_HOUR10);
	else
		msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
	msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1);
	msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10);
	msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1);
	if (tm->tm_wday != -1)
		msm6242_write(priv, tm->tm_wday, MSM6242_WEEK);
	msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10);
	msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1);
	if (tm->tm_year >= 100)
		tm->tm_year -= 100;
	msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10);
	msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1);

	msm6242_unlock(priv);
	return 0;
}

static const struct rtc_class_ops msm6242_rtc_ops = {
	.read_time	= msm6242_read_time,
	.set_time	= msm6242_set_time,
};

static int __init msm6242_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct msm6242_priv *priv;
	struct rtc_device *rtc;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

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

	priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
	if (!priv->regs)
		return -ENOMEM;
	platform_set_drvdata(pdev, priv);

	rtc = devm_rtc_device_register(&pdev->dev, "rtc-msm6242",
				&msm6242_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc))
		return PTR_ERR(rtc);

	priv->rtc = rtc;
	return 0;
}

static struct platform_driver msm6242_rtc_driver = {
	.driver	= {
		.name	= "rtc-msm6242",
	},
};

module_platform_driver_probe(msm6242_rtc_driver, msm6242_rtc_probe);

MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Oki MSM6242 RTC driver");
MODULE_ALIAS("platform:rtc-msm6242");
Commit	Line	Data
4f9b9bba GU	1	/*
	2	* Oki MSM6242 RTC Driver
	3	*
	4	* Copyright 2009 Geert Uytterhoeven
	5	*
	6	* Based on the A2000 TOD code in arch/m68k/amiga/config.c
	7	* Copyright (C) 1993 Hamish Macdonald
	8	*/
	9
a737e835 JP	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a737e835 JP	11
4f9b9bba GU	12	#include <linux/delay.h>
	13	#include <linux/io.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/rtc.h>
5a0e3ad6	18	#include <linux/slab.h>
4f9b9bba GU	19
	20
	21	enum {
	22	MSM6242_SECOND1 = 0x0, /* 1-second digit register */
	23	MSM6242_SECOND10 = 0x1, /* 10-second digit register */
	24	MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */
	25	MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */
	26	MSM6242_HOUR1 = 0x4, /* 1-hour digit register */
	27	MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */
	28	MSM6242_DAY1 = 0x6, /* 1-day digit register */
	29	MSM6242_DAY10 = 0x7, /* 10-day digit register */
	30	MSM6242_MONTH1 = 0x8, /* 1-month digit register */
	31	MSM6242_MONTH10 = 0x9, /* 10-month digit register */
	32	MSM6242_YEAR1 = 0xa, /* 1-year digit register */
	33	MSM6242_YEAR10 = 0xb, /* 10-year digit register */
	34	MSM6242_WEEK = 0xc, /* Week register */
	35	MSM6242_CD = 0xd, /* Control Register D */
	36	MSM6242_CE = 0xe, /* Control Register E */
	37	MSM6242_CF = 0xf, /* Control Register F */
	38	};
	39
	40	#define MSM6242_HOUR10_AM (0 << 2)
	41	#define MSM6242_HOUR10_PM (1 << 2)
	42	#define MSM6242_HOUR10_HR_MASK (3 << 0)
	43
	44	#define MSM6242_WEEK_SUNDAY 0
	45	#define MSM6242_WEEK_MONDAY 1
	46	#define MSM6242_WEEK_TUESDAY 2
	47	#define MSM6242_WEEK_WEDNESDAY 3
	48	#define MSM6242_WEEK_THURSDAY 4
	49	#define MSM6242_WEEK_FRIDAY 5
	50	#define MSM6242_WEEK_SATURDAY 6
	51
	52	#define MSM6242_CD_30_S_ADJ (1 << 3) /* 30-second adjustment */
	53	#define MSM6242_CD_IRQ_FLAG (1 << 2)
	54	#define MSM6242_CD_BUSY (1 << 1)
	55	#define MSM6242_CD_HOLD (1 << 0)
	56
	57	#define MSM6242_CE_T_MASK (3 << 2)
	58	#define MSM6242_CE_T_64HZ (0 << 2) /* period 1/64 second */
	59	#define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */
	60	#define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */
	61	#define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */
	62
	63	#define MSM6242_CE_ITRPT_STND (1 << 1)
	64	#define MSM6242_CE_MASK (1 << 0) /* STD.P output control */
	65
	66	#define MSM6242_CF_TEST (1 << 3)
	67	#define MSM6242_CF_12H (0 << 2)
	68	#define MSM6242_CF_24H (1 << 2)
	69	#define MSM6242_CF_STOP (1 << 1)
	70	#define MSM6242_CF_REST (1 << 0) /* reset */
	71
	72
	73	struct msm6242_priv {
	74	u32 __iomem *regs;
	75	struct rtc_device *rtc;
	76	};
	77
	78	static inline unsigned int msm6242_read(struct msm6242_priv *priv,
	79	unsigned int reg)
	80	{
	81	return __raw_readl(&priv->regs[reg]) & 0xf;
	82	}
83
84	static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val,
85	unsigned int reg)
86	{
d8ce1481	87	__raw_writel(val, &priv->regs[reg]);
4f9b9bba GU	88	}
	89
	90	static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val,
	91	unsigned int reg)
	92	{
	93	msm6242_write(priv, msm6242_read(priv, reg) \| val, reg);
	94	}
	95
	96	static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val,
	97	unsigned int reg)
	98	{
	99	msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg);
	100	}
	101
	102	static void msm6242_lock(struct msm6242_priv *priv)
	103	{
	104	int cnt = 5;
	105
	106	msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
	107
	108	while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) {
	109	msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
	110	udelay(70);
	111	msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
	112	cnt--;
	113	}
	114
	115	if (!cnt)
a737e835	116	pr_warn("timed out waiting for RTC (0x%x)\n",
2600f715	117	msm6242_read(priv, MSM6242_CD));
4f9b9bba GU	118	}
	119
	120	static void msm6242_unlock(struct msm6242_priv *priv)
	121	{
	122	msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
	123	}
	124
	125	static int msm6242_read_time(struct device dev, struct rtc_time tm)
	126	{
	127	struct msm6242_priv *priv = dev_get_drvdata(dev);
	128
	129	msm6242_lock(priv);
	130
	131	tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 +
	132	msm6242_read(priv, MSM6242_SECOND1);
	133	tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 +
	134	msm6242_read(priv, MSM6242_MINUTE1);
3d6f3c6b KJ	135	tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10) &
3d6f3c6b KJ	136	MSM6242_HOUR10_HR_MASK) * 10 +
4f9b9bba GU	137	msm6242_read(priv, MSM6242_HOUR1);
	138	tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 +
	139	msm6242_read(priv, MSM6242_DAY1);
	140	tm->tm_wday = msm6242_read(priv, MSM6242_WEEK);
	141	tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 +
	142	msm6242_read(priv, MSM6242_MONTH1) - 1;
	143	tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 +
	144	msm6242_read(priv, MSM6242_YEAR1);
	145	if (tm->tm_year <= 69)
	146	tm->tm_year += 100;
	147
	148	if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) {
	149	unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) &
	150	MSM6242_HOUR10_PM;
	151	if (!pm && tm->tm_hour == 12)
	152	tm->tm_hour = 0;
	153	else if (pm && tm->tm_hour != 12)
	154	tm->tm_hour += 12;
	155	}
	156
	157	msm6242_unlock(priv);
	158
	159	return rtc_valid_tm(tm);
	160	}
	161
	162	static int msm6242_set_time(struct device dev, struct rtc_time tm)
	163	{
	164	struct msm6242_priv *priv = dev_get_drvdata(dev);
	165
	166	msm6242_lock(priv);
	167
	168	msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10);
	169	msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1);
	170	msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10);
	171	msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1);
	172	if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)
	173	msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
	174	else if (tm->tm_hour >= 12)
	175	msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10,
	176	MSM6242_HOUR10);
	177	else
	178	msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
	179	msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1);
	180	msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10);
	181	msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1);
	182	if (tm->tm_wday != -1)
	183	msm6242_write(priv, tm->tm_wday, MSM6242_WEEK);
	184	msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10);
	185	msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1);
	186	if (tm->tm_year >= 100)
	187	tm->tm_year -= 100;
	188	msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10);
	189	msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1);
	190
	191	msm6242_unlock(priv);
	192	return 0;
	193	}
	194
	195	static const struct rtc_class_ops msm6242_rtc_ops = {
	196	.read_time = msm6242_read_time,
	197	.set_time = msm6242_set_time,
	198	};
	199
c40dcf6e	200	static int __init msm6242_rtc_probe(struct platform_device *pdev)
4f9b9bba GU	201	{
	202	struct resource *res;
	203	struct msm6242_priv *priv;
	204	struct rtc_device *rtc;
4f9b9bba	205
c40dcf6e	206	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
4f9b9bba GU	207	if (!res)
	208	return -ENODEV;
	209
c40dcf6e	210	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
4f9b9bba GU	211	if (!priv)
	212	return -ENOMEM;
	213
c40dcf6e JH	214	priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
	215	if (!priv->regs)
	216	return -ENOMEM;
	217	platform_set_drvdata(pdev, priv);
4f9b9bba	218
c40dcf6e JH	219	rtc = devm_rtc_device_register(&pdev->dev, "rtc-msm6242",
c40dcf6e JH	220	&msm6242_rtc_ops, THIS_MODULE);
e3aa7526 JH	221	if (IS_ERR(rtc))
e3aa7526 JH	222	return PTR_ERR(rtc);
4f9b9bba GU	223
4f9b9bba GU	224	priv->rtc = rtc;
4f9b9bba	225	return 0;
4f9b9bba GU	226	}
4f9b9bba GU	227
4f9b9bba GU	228	static struct platform_driver msm6242_rtc_driver = {
	229	.driver = {
	230	.name = "rtc-msm6242",
4f9b9bba	231	},
4f9b9bba GU	232	};
4f9b9bba GU	233
19cccfb5	234	module_platform_driver_probe(msm6242_rtc_driver, msm6242_rtc_probe);
4f9b9bba GU	235
	236	MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
	237	MODULE_LICENSE("GPL");
	238	MODULE_DESCRIPTION("Oki MSM6242 RTC driver");
	239	MODULE_ALIAS("platform:rtc-msm6242");