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