|
/*
|
* SPDX-License-Identifier: GPL-2.0+
|
* Sunxi RTC data area ops
|
*
|
* (C) Copyright 2018-2020
|
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
|
* wangwei <wangwei@allwinnertech.com>
|
*/
|
|
#include <common.h>
|
#include <errno.h>
|
#include <asm/io.h>
|
#include <rtc.h>
|
|
|
#define EFEX_FLAG (0x5AA5A55A)
|
#define RTC_FEL_INDEX 2
|
#define RTC_BOOT_INDEX 6
|
|
|
void rtc_write_data(int index, u32 val)
|
{
|
writel(val, SUNXI_RTC_DATA_BASE + index*4);
|
}
|
|
u32 rtc_read_data(int index)
|
{
|
return readl(SUNXI_RTC_DATA_BASE + index*4);
|
}
|
|
void rtc_set_fel_flag(void)
|
{
|
do {
|
rtc_write_data(RTC_FEL_INDEX, EFEX_FLAG);
|
asm volatile("DSB");
|
asm volatile("ISB");
|
} while (rtc_read_data(RTC_FEL_INDEX) != EFEX_FLAG);
|
}
|
|
u32 rtc_probe_fel_flag(void)
|
{
|
return rtc_read_data(RTC_FEL_INDEX) == EFEX_FLAG ? 1 : 0;
|
}
|
|
void rtc_clear_fel_flag(void)
|
{
|
do {
|
rtc_write_data(RTC_FEL_INDEX, 0);
|
asm volatile("DSB");
|
asm volatile("ISB");
|
} while (rtc_read_data(RTC_FEL_INDEX) != 0);
|
}
|
|
int rtc_set_bootmode_flag(u8 flag)
|
{
|
do {
|
rtc_write_data(RTC_BOOT_INDEX, flag);
|
asm volatile("DSB");
|
asm volatile("ISB");
|
} while (rtc_read_data(RTC_BOOT_INDEX) != flag);
|
|
return 0;
|
}
|
|
int rtc_get_bootmode_flag(void)
|
{
|
uint boot_flag;
|
|
/* operation should be same with kernel write rtc */
|
boot_flag = rtc_read_data(RTC_BOOT_INDEX);
|
|
return boot_flag;
|
}
|
