linux-imx

/*

 * An RTC driver for the NVIDIA Tegra 200 series internal RTC.

 *

 * Copyright (c) 2010, NVIDIA Corporation.

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */

​

#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/mod_devicetable.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/rtc.h>

#include <linux/slab.h>

​

/* set to 1 = busy every eight 32kHz clocks during copy of sec+msec to AHB */

#define TEGRA_RTC_REG_BUSY          0x004

#define TEGRA_RTC_REG_SECONDS           0x008

/* when msec is read, the seconds are buffered into shadow seconds. */

#define TEGRA_RTC_REG_SHADOW_SECONDS        0x00c

#define TEGRA_RTC_REG_MILLI_SECONDS     0x010

#define TEGRA_RTC_REG_SECONDS_ALARM0        0x014

#define TEGRA_RTC_REG_SECONDS_ALARM1        0x018

#define TEGRA_RTC_REG_MILLI_SECONDS_ALARM0  0x01c

#define TEGRA_RTC_REG_INTR_MASK         0x028

/* write 1 bits to clear status bits */

#define TEGRA_RTC_REG_INTR_STATUS       0x02c

​

/* bits in INTR_MASK */

#define TEGRA_RTC_INTR_MASK_MSEC_CDN_ALARM  (1<<4)

#define TEGRA_RTC_INTR_MASK_SEC_CDN_ALARM   (1<<3)

#define TEGRA_RTC_INTR_MASK_MSEC_ALARM      (1<<2)

#define TEGRA_RTC_INTR_MASK_SEC_ALARM1      (1<<1)

#define TEGRA_RTC_INTR_MASK_SEC_ALARM0      (1<<0)

​

/* bits in INTR_STATUS */

#define TEGRA_RTC_INTR_STATUS_MSEC_CDN_ALARM    (1<<4)

#define TEGRA_RTC_INTR_STATUS_SEC_CDN_ALARM (1<<3)

#define TEGRA_RTC_INTR_STATUS_MSEC_ALARM    (1<<2)

#define TEGRA_RTC_INTR_STATUS_SEC_ALARM1    (1<<1)

#define TEGRA_RTC_INTR_STATUS_SEC_ALARM0    (1<<0)

​

struct tegra_rtc_info {

    struct platform_device  *pdev;

    struct rtc_device   *rtc_dev;