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/*
* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <debug.h>
#include <delay_timer.h>
#include <mt8173_def.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
};
static uint16_t RTC_Read(uint32_t addr)
{
uint32_t rdata = 0;
pwrap_read((uint32_t)addr, &rdata);
return (uint16_t)rdata;
}
static void RTC_Write(uint32_t addr, uint16_t data)
{
pwrap_write((uint32_t)addr, (uint32_t)data);
}
static inline 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;
}
static int32_t Write_trigger(void)
{
RTC_Write(RTC_WRTGR, 1);
return rtc_busy_wait();
}
static int32_t Writeif_unlock(void)
{
RTC_Write(RTC_PROT, RTC_PROT_UNLOCK1);
if (!Write_trigger())
return 0;
RTC_Write(RTC_PROT, RTC_PROT_UNLOCK2);
if (!Write_trigger())
return 0;
return 1;
}
void rtc_bbpu_power_down(void)
{
uint16_t bbpu;
/* pull PWRBB low */
bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_PWREN;
if (Writeif_unlock()) {
RTC_Write(RTC_BBPU, bbpu);
if (!Write_trigger())
assert(1);
} else {
assert(1);
}
}
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