linux-imx

/*

 * 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/bitops.h>

#include <linux/io.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/delay.h>

#include <linux/clk.h>

#include <linux/gfp.h>

#include <linux/module.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  BIT(22) /* 12 hour mode */

​

#define RTC_DATE_REG_OFFS   4

#define RTC_MDAY_OFFS       0

#define RTC_MONTH_OFFS      8

#define RTC_YEAR_OFFS       16

​

#define RTC_ALARM_TIME_REG_OFFS 8

#define RTC_ALARM_DATE_REG_OFFS 0xc

#define RTC_ALARM_VALID     BIT(7)

​

#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS   0x10

#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS  0x14

​

struct rtc_plat_data {

    struct rtc_device *rtc;

    void __iomem *ioaddr;

    int     irq;

    struct clk  *clk;

};

​

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 hour 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);