83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
51 lines
915 B
C
51 lines
915 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
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*/
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/*
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* This library provides CMOS (inside RTC SRAM) access routines at a very
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* early stage when driver model is not available yet. Only read access is
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* provided. The 16-bit/32-bit read are compatible with driver model RTC
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* uclass write ops, that data is stored in little-endian mode.
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*/
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#include <common.h>
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#include <asm/early_cmos.h>
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#include <asm/io.h>
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u8 cmos_read8(u8 addr)
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{
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outb(addr, CMOS_IO_PORT);
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return inb(CMOS_IO_PORT + 1);
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}
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u16 cmos_read16(u8 addr)
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{
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u16 value = 0;
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u16 data;
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int i;
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for (i = 0; i < sizeof(value); i++) {
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data = cmos_read8(addr + i);
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value |= data << (i << 3);
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}
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return value;
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}
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u32 cmos_read32(u8 addr)
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{
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u32 value = 0;
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u32 data;
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int i;
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for (i = 0; i < sizeof(value); i++) {
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data = cmos_read8(addr + i);
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value |= data << (i << 3);
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}
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return value;
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}
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