[mirror_ubuntu-artful-kernel.git] / drivers / rtc / rtc-mv.c

/*
 * Driver for the RTC in Marvell SoCs.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/io.h>
#include <linux/platform_device.h>


#define RTC_TIME_REG_OFFS	0
#define RTC_SECONDS_OFFS	0
#define RTC_MINUTES_OFFS	8
#define RTC_HOURS_OFFS		16
#define RTC_WDAY_OFFS		24
#define RTC_HOURS_12H_MODE		(1 << 22) /* 12 hours mode */

#define RTC_DATE_REG_OFFS	4
#define RTC_MDAY_OFFS		0
#define RTC_MONTH_OFFS		8
#define RTC_YEAR_OFFS		16


struct rtc_plat_data {
	struct rtc_device *rtc;
	void __iomem *ioaddr;
};

static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_reg;

	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
		(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
		(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
		(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);

	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
		(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
		(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);

	return 0;
}

static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	tm->tm_sec = bcd2bin(second);
	tm->tm_min = bcd2bin(minute);
	tm->tm_hour = bcd2bin(hour);
	tm->tm_mday = bcd2bin(day);
	tm->tm_wday = bcd2bin(wday);
	tm->tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	tm->tm_year = bcd2bin(year) + 100;

	return rtc_valid_tm(tm);
}

static const struct rtc_class_ops mv_rtc_ops = {
	.read_time	= mv_rtc_read_time,
	.set_time	= mv_rtc_set_time,
};

static int __init mv_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct rtc_plat_data *pdata;
	resource_size_t size;
	u32 rtc_time;

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

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

	size = resource_size(res);
	if (!devm_request_mem_region(&pdev->dev, res->start, size,
				     pdev->name))
		return -EBUSY;

	pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
	if (!pdata->ioaddr)
		return -ENOMEM;

	/* make sure the 24 hours mode is enabled */
	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	if (rtc_time & RTC_HOURS_12H_MODE) {
		dev_err(&pdev->dev, "24 Hours mode not supported.\n");
		return -EINVAL;
	}

	platform_set_drvdata(pdev, pdata);
	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
					 &mv_rtc_ops, THIS_MODULE);
	if (IS_ERR(pdata->rtc))
		return PTR_ERR(pdata->rtc);

	return 0;
}

static int __exit mv_rtc_remove(struct platform_device *pdev)
{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	rtc_device_unregister(pdata->rtc);
	return 0;
}

static struct platform_driver mv_rtc_driver = {
	.remove		= __exit_p(mv_rtc_remove),
	.driver		= {
		.name	= "rtc-mv",
		.owner	= THIS_MODULE,
	},
};

static __init int mv_init(void)
{
	return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
}

static __exit void mv_exit(void)
{
	platform_driver_unregister(&mv_rtc_driver);
}

module_init(mv_init);
module_exit(mv_exit);

MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
MODULE_DESCRIPTION("Marvell RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rtc-mv");
Commit	Line	Data
defb4514 SB	1	/*
	2	* Driver for the RTC in Marvell SoCs.
	3	*
	4	* This file is licensed under the terms of the GNU General Public
	5	* License version 2. This program is licensed "as is" without any
	6	* warranty of any kind, whether express or implied.
	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/kernel.h>
	11	#include <linux/rtc.h>
	12	#include <linux/bcd.h>
	13	#include <linux/io.h>
	14	#include <linux/platform_device.h>
	15
	16
	17	#define RTC_TIME_REG_OFFS 0
	18	#define RTC_SECONDS_OFFS 0
	19	#define RTC_MINUTES_OFFS 8
	20	#define RTC_HOURS_OFFS 16
	21	#define RTC_WDAY_OFFS 24
	22	#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */
	23
	24	#define RTC_DATE_REG_OFFS 4
	25	#define RTC_MDAY_OFFS 0
	26	#define RTC_MONTH_OFFS 8
	27	#define RTC_YEAR_OFFS 16
	28
	29
	30	struct rtc_plat_data {
	31	struct rtc_device *rtc;
	32	void __iomem *ioaddr;
	33	};
	34
	35	static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
	36	{
	37	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	38	void __iomem *ioaddr = pdata->ioaddr;
	39	u32 rtc_reg;
	40
	41	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
	42	(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
	43	(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
	44	(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	45	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
	46
	47	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
	48	(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
	49	(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
	50	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
	51
	52	return 0;
	53	}
	54
	55	static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
	56	{
	57	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	58	void __iomem *ioaddr = pdata->ioaddr;
	59	u32 rtc_time, rtc_date;
	60	unsigned int year, month, day, hour, minute, second, wday;
	61
	62	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	63	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
	64
65	second = rtc_time & 0x7f;
66	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
67	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
68	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
69
70	day = rtc_date & 0x3f;
71	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
72	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
73
74	tm->tm_sec = bcd2bin(second);
75	tm->tm_min = bcd2bin(minute);
76	tm->tm_hour = bcd2bin(hour);
77	tm->tm_mday = bcd2bin(day);
78	tm->tm_wday = bcd2bin(wday);
79	tm->tm_mon = bcd2bin(month) - 1;
80	/* hw counts from year 2000, but tm_year is relative to 1900 */
81	tm->tm_year = bcd2bin(year) + 100;
82
83	return rtc_valid_tm(tm);
84	}
85
86	static const struct rtc_class_ops mv_rtc_ops = {
87	.read_time = mv_rtc_read_time,
88	.set_time = mv_rtc_set_time,
89	};
90
91	static int __init mv_rtc_probe(struct platform_device *pdev)
92	{
93	struct resource *res;
94	struct rtc_plat_data *pdata;
95	resource_size_t size;
96	u32 rtc_time;
97
98	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99	if (!res)
100	return -ENODEV;
101
102	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
103	if (!pdata)
104	return -ENOMEM;
105
106	size = resource_size(res);
107	if (!devm_request_mem_region(&pdev->dev, res->start, size,
108	pdev->name))
109	return -EBUSY;
110
111	pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
112	if (!pdata->ioaddr)
113	return -ENOMEM;
114
115	/* make sure the 24 hours mode is enabled */
116	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
117	if (rtc_time & RTC_HOURS_12H_MODE) {
118	dev_err(&pdev->dev, "24 Hours mode not supported.\n");
119	return -EINVAL;
120	}
121
122	platform_set_drvdata(pdev, pdata);
123	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
124	&mv_rtc_ops, THIS_MODULE);
125	if (IS_ERR(pdata->rtc))
126	return PTR_ERR(pdata->rtc);
127
128	return 0;
129	}
130
131	static int __exit mv_rtc_remove(struct platform_device *pdev)
132	{
133	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
134
135	rtc_device_unregister(pdata->rtc);
136	return 0;
137	}
138
139	static struct platform_driver mv_rtc_driver = {
140	.remove = __exit_p(mv_rtc_remove),
141	.driver = {
142	.name = "rtc-mv",
143	.owner = THIS_MODULE,
144	},
145	};
146
147	static __init int mv_init(void)
148	{
149	return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
150	}
151
152	static __exit void mv_exit(void)
153	{
154	platform_driver_unregister(&mv_rtc_driver);
155	}
156
157	module_init(mv_init);
158	module_exit(mv_exit);
159
160	MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
161	MODULE_DESCRIPTION("Marvell RTC driver");
162	MODULE_LICENSE("GPL");
163	MODULE_ALIAS("platform:rtc-mv");