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/*
* Copyright (c) 2019, MediaTek Inc. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <common/debug.h>
#include <drivers/delay_timer.h>
#include <pmic_wrap_init.h>
#include <rtc.h>
/* RTC busy status polling interval and retry count */
enum {
RTC_WRTGR_POLLING_DELAY_MS = 10,
RTC_WRTGR_POLLING_CNT = 100
};
uint16_t RTC_Read(uint32_t addr)
{
uint32_t rdata = 0;
pwrap_read((uint32_t)addr, &rdata);
return (uint16_t)rdata;
}
void RTC_Write(uint32_t addr, uint16_t data)
{
pwrap_write((uint32_t)addr, (uint32_t)data);
}
int32_t rtc_busy_wait(void)
{
uint64_t retry = RTC_WRTGR_POLLING_CNT;
do {
mdelay(RTC_WRTGR_POLLING_DELAY_MS);
if (!(RTC_Read(RTC_BBPU) & RTC_BBPU_CBUSY))
return 1;
retry--;
} while (retry);
ERROR("[RTC] rtc cbusy time out!\n");
return 0;
}
int32_t RTC_Write_Trigger(void)
{
RTC_Write(RTC_WRTGR, 1);
return rtc_busy_wait();
}
int32_t Writeif_unlock(void)
{
RTC_Write(RTC_PROT, RTC_PROT_UNLOCK1);
if (!RTC_Write_Trigger())
return 0;
RTC_Write(RTC_PROT, RTC_PROT_UNLOCK2);
if (!RTC_Write_Trigger())
return 0;
return 1;
}
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