linux-imx

/*

 * rtc-st-lpc.c - ST's LPC RTC, powered by the Low Power Timer

 *

 * Copyright (C) 2014 STMicroelectronics Limited

 *

 * Author: David Paris <david.paris@st.com> for STMicroelectronics

 *         Lee Jones <lee.jones@linaro.org> for STMicroelectronics

 *

 * Based on the original driver written by Stuart Menefy.

 *

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

 * modify it under the terms of the GNU General Public Licence

 * as published by the Free Software Foundation; either version

 * 2 of the Licence, or (at your option) any later version.

 */

​

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_irq.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

​

#include <dt-bindings/mfd/st-lpc.h>

​

/* Low Power Timer */

#define LPC_LPT_LSB_OFF     0x400

#define LPC_LPT_MSB_OFF     0x404

#define LPC_LPT_START_OFF   0x408

​

/* Low Power Alarm */

#define LPC_LPA_LSB_OFF     0x410

#define LPC_LPA_MSB_OFF     0x414

#define LPC_LPA_START_OFF   0x418

​

/* LPC as WDT */

#define LPC_WDT_OFF     0x510

#define LPC_WDT_FLAG_OFF    0x514

​

struct st_rtc {

    struct rtc_device *rtc_dev;

    struct rtc_wkalrm alarm;

    struct resource *res;

    struct clk *clk;

    unsigned long clkrate;

    void __iomem *ioaddr;

    bool irq_enabled:1;

    spinlock_t lock;

    short irq;

};

​

static void st_rtc_set_hw_alarm(struct st_rtc *rtc,

                unsigned long msb, unsigned long  lsb)

{

    unsigned long flags;

​

    spin_lock_irqsave(&rtc->lock, flags);

​