linux-imx

/*

* Copyright (c) 2014-2015 MediaTek Inc.

* Author: Tianping.Fang <tianping.fang@mediatek.com>

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License version 2 as

* published by the Free Software Foundation.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

*/

​

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/rtc.h>

#include <linux/irqdomain.h>

#include <linux/platform_device.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/io.h>

#include <linux/mfd/mt6397/core.h>

​

#define RTC_BBPU        0x0000

#define RTC_BBPU_CBUSY      BIT(6)

​

#define RTC_WRTGR       0x003c

​

#define RTC_IRQ_STA     0x0002

#define RTC_IRQ_STA_AL      BIT(0)

#define RTC_IRQ_STA_LP      BIT(3)

​

#define RTC_IRQ_EN      0x0004

#define RTC_IRQ_EN_AL       BIT(0)

#define RTC_IRQ_EN_ONESHOT  BIT(2)

#define RTC_IRQ_EN_LP       BIT(3)

#define RTC_IRQ_EN_ONESHOT_AL   (RTC_IRQ_EN_ONESHOT | RTC_IRQ_EN_AL)

​

#define RTC_AL_MASK     0x0008

#define RTC_AL_MASK_DOW     BIT(4)

​

#define RTC_TC_SEC      0x000a

/* Min, Hour, Dom... register offset to RTC_TC_SEC */

#define RTC_OFFSET_SEC      0

#define RTC_OFFSET_MIN      1

#define RTC_OFFSET_HOUR     2

#define RTC_OFFSET_DOM      3

#define RTC_OFFSET_DOW      4

#define RTC_OFFSET_MTH      5

#define RTC_OFFSET_YEAR     6

#define RTC_OFFSET_COUNT    7

​

#define RTC_AL_SEC      0x0018

​

#define RTC_PDN2        0x002e

#define RTC_PDN2_PWRON_ALARM    BIT(4)

​

#define RTC_MIN_YEAR        1968

#define RTC_BASE_YEAR       1900

#define RTC_NUM_YEARS       128

#define RTC_MIN_YEAR_OFFSET (RTC_MIN_YEAR - RTC_BASE_YEAR)

​

struct mt6397_rtc {

    struct device       *dev;

    struct rtc_device   *rtc_dev;

    struct mutex        lock;

    struct regmap       *regmap;

    int         irq;

    u32         addr_base;

};

​

static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)

{

    unsigned long timeout = jiffies + HZ;

    int ret;

    u32 data;

​

    ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);

    if (ret < 0)

        return ret;

​

    while (1) {

        ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_BBPU,

                  &data);

        if (ret < 0)

            break;

        if (!(data & RTC_BBPU_CBUSY))

            break;

        if (time_after(jiffies, timeout)) {