103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
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* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <debug.h>
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#include <delay_timer.h>
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#include <mt8173_def.h>
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#include <pmic_wrap_init.h>
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#include <rtc.h>
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/* RTC busy status polling interval and retry count */
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enum {
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RTC_WRTGR_POLLING_DELAY_MS = 10,
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RTC_WRTGR_POLLING_CNT = 100
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};
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static uint16_t RTC_Read(uint32_t addr)
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{
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uint32_t rdata = 0;
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pwrap_read((uint32_t)addr, &rdata);
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return (uint16_t)rdata;
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}
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static void RTC_Write(uint32_t addr, uint16_t data)
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{
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pwrap_write((uint32_t)addr, (uint32_t)data);
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}
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static inline int32_t rtc_busy_wait(void)
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{
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uint64_t retry = RTC_WRTGR_POLLING_CNT;
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do {
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mdelay(RTC_WRTGR_POLLING_DELAY_MS);
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if (!(RTC_Read(RTC_BBPU) & RTC_BBPU_CBUSY))
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return 1;
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retry--;
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} while (retry);
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ERROR("[RTC] rtc cbusy time out!\n");
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return 0;
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}
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static int32_t Write_trigger(void)
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{
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RTC_Write(RTC_WRTGR, 1);
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return rtc_busy_wait();
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}
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static int32_t Writeif_unlock(void)
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{
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RTC_Write(RTC_PROT, RTC_PROT_UNLOCK1);
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if (!Write_trigger())
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return 0;
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RTC_Write(RTC_PROT, RTC_PROT_UNLOCK2);
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if (!Write_trigger())
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return 0;
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return 1;
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}
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void rtc_bbpu_power_down(void)
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{
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uint16_t bbpu;
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/* pull PWRBB low */
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bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_PWREN;
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if (Writeif_unlock()) {
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RTC_Write(RTC_BBPU, bbpu);
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if (!Write_trigger())
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assert(1);
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} else {
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assert(1);
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}
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}
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