/*
 * Copyright (C) 2010 MediaTek, Inc.
 *
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */
#ifdef pr_fmt
#undef pr_fmt
#endif
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rtc.h>
#include <mach/upmu_hw.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/types.h>

#include <mach/mtk_rtc_hal.h>
#include <mtk_rtc_hal_common.h>
#include <mach/mt_rtc_hw.h>
#include <mt_pmic_wrap.h>
#if defined CONFIG_MTK_KERNEL_POWER_OFF_CHARGING
#include <mt_boot.h>
#endif

#include <mt_gpio.h>
/*#include <mach/sync_write.h>
#include "mach/ext_wd_drv.h"*/
#include <mt-plat/charging.h>

#define hal_rtc_xinfo(fmt, args...)		\
	pr_notice(fmt, ##args)

#define hal_rtc_xerror(fmt, args...)	\
	pr_err(fmt, ##args)

#define hal_rtc_xfatal(fmt, args...)	\
	pr_emerg(fmt, ##args)

/* Causion, can only use this hardcode in MT6323*/
#define GPIO_SRCLKEN_PIN (37 | 0x80000000)

/*
	RTC_FGSOC = 0,
	RTC_ANDROID,
	RTC_RECOVERY,
	RTC_FAC_RESET,
	RTC_BYPASS_PWR,
	RTC_PWRON_TIME,
	RTC_FAST_BOOT,
	RTC_KPOC,
	RTC_DEBUG,
	RTC_PWRON_AL,
	RTC_UART,
	RTC_AUTOBOOT,
	RTC_PWRON_LOGO,
	RTC_32K_LESS,
	RTC_LP_DET,
	RTC_SPAR_NUM

*/
/*
 * RTC_PDN1:
 *     bit 0 - 3  : Android bits
 *     bit 4 - 5  : Recovery bits (0x10: factory data reset)
 *     bit 6      : Bypass PWRKEY bit
 *     bit 7      : Power-On Time bit
 *     bit 8      : RTC_GPIO_USER_WIFI bit
 *     bit 9      : RTC_GPIO_USER_GPS bit
 *     bit 10     : RTC_GPIO_USER_BT bit
 *     bit 11     : RTC_GPIO_USER_FM bit
 *     bit 12     : RTC_GPIO_USER_PMIC bit
 *     bit 13     : Fast Boot
 *     bit 14	  : Kernel Power Off Charging
 *     bit 15     : Debug bit
 */
/*
 * RTC_PDN2:
 *     bit 0 - 3 : MTH in power-on time
 *     bit 4	 : Power-On Alarm bit
 *     bit 5 - 6 : UART bits
 *     bit 7	 : autoboot bit
 *     bit 8 - 14: YEA in power-on time
 *     bit 15	 : Power-On Logo bit
 */
/*
 * RTC_SPAR0:
 *     bit 0 - 5 : SEC in power-on time
 *     bit 6	 : 32K less bit. True:with 32K, False:Without 32K
 *     bit 7 - 15: reserved bits
 */

u16 rtc_spare_reg[][3] = {
	{RTC_AL_HOU, 0x7f, 8},
	{RTC_PDN1, 0xf, 0},
	{RTC_PDN1, 0x3, 4},
	{RTC_PDN1, 0x1, 6},
	{RTC_PDN1, 0x1, 7},
	{RTC_PDN1, 0x1, 13},
	{RTC_PDN1, 0x1, 14},
	{RTC_PDN1, 0x1, 15},
	{RTC_PDN2, 0x1, 4},
	{RTC_PDN2, 0x3, 5},
	{RTC_PDN2, 0x1, 7},
	{RTC_PDN2, 0x1, 15},
	{RTC_SPAR0, 0x1, 6},
	{RTC_SPAR0, 0x1, 7}
};

void hal_rtc_set_abb_32k(u16 enable)
{
	u16 con;

	if (enable)
		con = rtc_read(RTC_OSC32CON) | RTC_OSC32CON_LNBUFEN;
	else
		con = rtc_read(RTC_OSC32CON) & ~RTC_OSC32CON_LNBUFEN;

	rtc_xosc_write(con, true);
	hal_rtc_xinfo("enable ABB 32k (0x%x)\n", con);
}

u16 hal_rtc_get_gpio_32k_status(void)
{
	u16 con;

	con = rtc_read(RTC_CON);

	hal_rtc_xinfo("RTC_GPIO 32k status(RTC_CON=0x%x)\n", con);

	if (con & RTC_CON_F32KOB)
		return 0;
	else
		return 1;
}

void hal_rtc_set_gpio_32k_status(u16 user, bool enable)
{
	u16 con, pdn1;

	if (enable) {
		pdn1 = rtc_read(RTC_PDN1);
	} else {
		pdn1 = rtc_read(RTC_PDN1) & ~(1U << user);
		rtc_write(RTC_PDN1, pdn1);
		rtc_write_trigger();
	}

	con = rtc_read(RTC_CON);
	if (enable) {
		con &= ~RTC_CON_F32KOB;
	} else {
		if (!(pdn1 & RTC_GPIO_USER_MASK)) {	/* no users */
			con |= RTC_CON_F32KOB;
		}
	}
	rtc_write(RTC_CON, con);
	rtc_write_trigger();


	if (enable) {
		pdn1 |= (1U << user);
		rtc_write(RTC_PDN1, pdn1);
		rtc_write_trigger();
	}
	hal_rtc_xinfo("RTC_GPIO user %d enable = %d 32k (0x%x)\n", user, enable, pdn1);
}

void hal_rtc_bbpu_pwdn(void)
{
	u16 ret_val, con;

	/* disable 32K export if there are no RTC_GPIO users */
	if (!(rtc_read(RTC_PDN1) & RTC_GPIO_USER_MASK)) {
		con = rtc_read(RTC_CON) | RTC_CON_F32KOB;
		rtc_write(RTC_CON, con);
		rtc_write_trigger();
	}
	ret_val = hal_rtc_get_spare_register(RTC_32K_LESS);
	if (!ret_val && pmic_chrdet_status() == KAL_FALSE) {
#if 0
		/* 1.   Set SRCLKENAs GPIO GPIO as Output Mode, Output Low */
		mt_set_gpio_dir(GPIO_SRCLKEN_PIN, GPIO_DIR_OUT);
		mt_set_gpio_out(GPIO_SRCLKEN_PIN, GPIO_OUT_ZERO);
		/* 2. pull PWRBB low */
		rtc_bbpu_pwrdown(true);

		/* 3.   Switch SRCLKENAs GPIO MUX function to GPIO Mode */
		mt_set_gpio_mode(GPIO_SRCLKEN_PIN, GPIO_MODE_GPIO);
#endif
	} else
		rtc_bbpu_pwrdown(true);
}

void hal_rtc_get_pwron_alarm(struct rtc_time *tm, struct rtc_wkalrm *alm)
{
	u16 pdn1, pdn2;


	pdn1 = rtc_read(RTC_PDN1);
	pdn2 = rtc_read(RTC_PDN2);

	alm->enabled = (pdn1 & RTC_PDN1_PWRON_TIME ? (pdn2 & RTC_PDN2_PWRON_LOGO ? 3 : 2) : 0);
	alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);	/* return Power-On Alarm bit */

	hal_rtc_get_alarm_time(tm);
}

bool hal_rtc_is_lp_irq(void)
{
	u16 irqsta;

	irqsta = rtc_read(RTC_IRQ_STA);	/* read clear */
	if (unlikely(!(irqsta & RTC_IRQ_STA_AL))) {
#ifndef USER_BUILD_KERNEL
		if (irqsta & RTC_IRQ_STA_LP)
			rtc_lp_exception();
#endif
		return true;
	}

	return false;
}

bool hal_rtc_is_pwron_alarm(struct rtc_time *nowtm, struct rtc_time *tm)
{
	u16 pdn1;

	pdn1 = rtc_read(RTC_PDN1);
	hal_rtc_xinfo("pdn1 = 0x%4x\n", pdn1);

	if (pdn1 & RTC_PDN1_PWRON_TIME) {	/* power-on time is available */

		hal_rtc_xinfo("pdn1 = 0x%4x\n", pdn1);
		hal_rtc_get_tick_time(nowtm);
		hal_rtc_xinfo("pdn1 = 0x%4x\n", pdn1);
		if (rtc_read(RTC_TC_SEC) < nowtm->tm_sec) {	/* SEC has carried */
			hal_rtc_get_tick_time(nowtm);
		}

		hal_rtc_get_pwron_alarm_time(tm);

		return true;
	}

	return false;
}

void hal_rtc_get_alarm(struct rtc_time *tm, struct rtc_wkalrm *alm)
{
	u16 irqen, pdn2;

	irqen = rtc_read(RTC_IRQ_EN);
	hal_rtc_get_alarm_time(tm);
	pdn2 = rtc_read(RTC_PDN2);
	alm->enabled = !!(irqen & RTC_IRQ_EN_AL);
	alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);	/* return Power-On Alarm bit */
}

void hal_rtc_set_alarm(struct rtc_time *tm)
{
	u16 irqen;

	hal_rtc_set_alarm_time(tm);

	irqen = rtc_read(RTC_IRQ_EN) | RTC_IRQ_EN_ONESHOT_AL;
	rtc_write(RTC_IRQ_EN, irqen);
	rtc_write_trigger();
}

void hal_rtc_clear_alarm(struct rtc_time *tm)
{
	u16 irqsta, irqen, pdn2;

	irqen = rtc_read(RTC_IRQ_EN) & ~RTC_IRQ_EN_AL;
	pdn2 = rtc_read(RTC_PDN2) & ~RTC_PDN2_PWRON_ALARM;
	rtc_write(RTC_IRQ_EN, irqen);
	rtc_write(RTC_PDN2, pdn2);
	rtc_write_trigger();
	irqsta = rtc_read(RTC_IRQ_STA);	/* read clear */

	hal_rtc_set_alarm_time(tm);
}

void hal_rtc_set_lp_irq(void)
{
	u16 irqen;

#ifndef USER_BUILD_KERNEL
	irqen = rtc_read(RTC_IRQ_EN) | RTC_IRQ_EN_LP;
#else
	irqen = rtc_read(RTC_IRQ_EN) & ~RTC_IRQ_EN_LP;
#endif
	rtc_write(RTC_IRQ_EN, irqen);
	rtc_write_trigger();
}

void hal_rtc_save_pwron_time(bool enable, struct rtc_time *tm, bool logo)
{
	u16 pdn1, pdn2;

	hal_rtc_set_pwron_alarm_time(tm);

	if (logo)
		pdn2 = rtc_read(RTC_PDN2) | RTC_PDN2_PWRON_LOGO;
	else
		pdn2 = rtc_read(RTC_PDN2) & ~RTC_PDN2_PWRON_LOGO;

	rtc_write(RTC_PDN2, pdn2);

	if (enable)
		pdn1 = rtc_read(RTC_PDN1) | RTC_PDN1_PWRON_TIME;
	else
		pdn1 = rtc_read(RTC_PDN1) & ~RTC_PDN1_PWRON_TIME;
	rtc_write(RTC_PDN1, pdn1);
	rtc_write_trigger();
}